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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Expander
; use Expander
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
36 with Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Rident
; use Rident
;
44 with Restrict
; use Restrict
;
45 with Rtsfind
; use Rtsfind
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch3
; use Sem_Ch3
;
49 with Sem_Ch6
; use Sem_Ch6
;
50 with Sem_Ch7
; use Sem_Ch7
;
51 with Sem_Ch8
; use Sem_Ch8
;
52 with Sem_Ch10
; use Sem_Ch10
;
53 with Sem_Ch13
; use Sem_Ch13
;
54 with Sem_Disp
; use Sem_Disp
;
55 with Sem_Elab
; use Sem_Elab
;
56 with Sem_Elim
; use Sem_Elim
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Res
; use Sem_Res
;
59 with Sem_Type
; use Sem_Type
;
60 with Sem_Util
; use Sem_Util
;
61 with Sem_Warn
; use Sem_Warn
;
62 with Stand
; use Stand
;
63 with Sinfo
; use Sinfo
;
64 with Sinfo
.CN
; use Sinfo
.CN
;
65 with Sinput
; use Sinput
;
66 with Sinput
.L
; use Sinput
.L
;
67 with Snames
; use Snames
;
68 with Stringt
; use Stringt
;
69 with Uname
; use Uname
;
71 with Tbuild
; use Tbuild
;
72 with Uintp
; use Uintp
;
73 with Urealp
; use Urealp
;
77 package body Sem_Ch12
is
79 ----------------------------------------------------------
80 -- Implementation of Generic Analysis and Instantiation --
81 -----------------------------------------------------------
83 -- GNAT implements generics by macro expansion. No attempt is made to
84 -- share generic instantiations (for now). Analysis of a generic definition
85 -- does not perform any expansion action, but the expander must be called
86 -- on the tree for each instantiation, because the expansion may of course
87 -- depend on the generic actuals. All of this is best achieved as follows:
89 -- a) Semantic analysis of a generic unit is performed on a copy of the
90 -- tree for the generic unit. All tree modifications that follow analysis
91 -- do not affect the original tree. Links are kept between the original
92 -- tree and the copy, in order to recognize non-local references within
93 -- the generic, and propagate them to each instance (recall that name
94 -- resolution is done on the generic declaration: generics are not really
95 -- macros!). This is summarized in the following diagram:
97 -- .-----------. .----------.
98 -- | semantic |<--------------| generic |
100 -- | |==============>| |
101 -- |___________| global |__________|
112 -- b) Each instantiation copies the original tree, and inserts into it a
113 -- series of declarations that describe the mapping between generic formals
114 -- and actuals. For example, a generic In OUT parameter is an object
115 -- renaming of the corresponing actual, etc. Generic IN parameters are
116 -- constant declarations.
118 -- c) In order to give the right visibility for these renamings, we use
119 -- a different scheme for package and subprogram instantiations. For
120 -- packages, the list of renamings is inserted into the package
121 -- specification, before the visible declarations of the package. The
122 -- renamings are analyzed before any of the text of the instance, and are
123 -- thus visible at the right place. Furthermore, outside of the instance,
124 -- the generic parameters are visible and denote their corresponding
127 -- For subprograms, we create a container package to hold the renamings
128 -- and the subprogram instance itself. Analysis of the package makes the
129 -- renaming declarations visible to the subprogram. After analyzing the
130 -- package, the defining entity for the subprogram is touched-up so that
131 -- it appears declared in the current scope, and not inside the container
134 -- If the instantiation is a compilation unit, the container package is
135 -- given the same name as the subprogram instance. This ensures that
136 -- the elaboration procedure called by the binder, using the compilation
137 -- unit name, calls in fact the elaboration procedure for the package.
139 -- Not surprisingly, private types complicate this approach. By saving in
140 -- the original generic object the non-local references, we guarantee that
141 -- the proper entities are referenced at the point of instantiation.
142 -- However, for private types, this by itself does not insure that the
143 -- proper VIEW of the entity is used (the full type may be visible at the
144 -- point of generic definition, but not at instantiation, or vice-versa).
145 -- In order to reference the proper view, we special-case any reference
146 -- to private types in the generic object, by saving both views, one in
147 -- the generic and one in the semantic copy. At time of instantiation, we
148 -- check whether the two views are consistent, and exchange declarations if
149 -- necessary, in order to restore the correct visibility. Similarly, if
150 -- the instance view is private when the generic view was not, we perform
151 -- the exchange. After completing the instantiation, we restore the
152 -- current visibility. The flag Has_Private_View marks identifiers in the
153 -- the generic unit that require checking.
155 -- Visibility within nested generic units requires special handling.
156 -- Consider the following scheme:
158 -- type Global is ... -- outside of generic unit.
162 -- type Semi_Global is ... -- global to inner.
165 -- procedure inner (X1 : Global; X2 : Semi_Global);
167 -- procedure in2 is new inner (...); -- 4
170 -- package New_Outer is new Outer (...); -- 2
171 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
173 -- The semantic analysis of Outer captures all occurrences of Global.
174 -- The semantic analysis of Inner (at 1) captures both occurrences of
175 -- Global and Semi_Global.
177 -- At point 2 (instantiation of Outer), we also produce a generic copy
178 -- of Inner, even though Inner is, at that point, not being instantiated.
179 -- (This is just part of the semantic analysis of New_Outer).
181 -- Critically, references to Global within Inner must be preserved, while
182 -- references to Semi_Global should not preserved, because they must now
183 -- resolve to an entity within New_Outer. To distinguish between these, we
184 -- use a global variable, Current_Instantiated_Parent, which is set when
185 -- performing a generic copy during instantiation (at 2). This variable is
186 -- used when performing a generic copy that is not an instantiation, but
187 -- that is nested within one, as the occurrence of 1 within 2. The analysis
188 -- of a nested generic only preserves references that are global to the
189 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
190 -- determine whether a reference is external to the given parent.
192 -- The instantiation at point 3 requires no special treatment. The method
193 -- works as well for further nestings of generic units, but of course the
194 -- variable Current_Instantiated_Parent must be stacked because nested
195 -- instantiations can occur, e.g. the occurrence of 4 within 2.
197 -- The instantiation of package and subprogram bodies is handled in a
198 -- similar manner, except that it is delayed until after semantic
199 -- analysis is complete. In this fashion complex cross-dependencies
200 -- between several package declarations and bodies containing generics
201 -- can be compiled which otherwise would diagnose spurious circularities.
203 -- For example, it is possible to compile two packages A and B that
204 -- have the following structure:
206 -- package A is package B is
207 -- generic ... generic ...
208 -- package G_A is package G_B is
211 -- package body A is package body B is
212 -- package N_B is new G_B (..) package N_A is new G_A (..)
214 -- The table Pending_Instantiations in package Inline is used to keep
215 -- track of body instantiations that are delayed in this manner. Inline
216 -- handles the actual calls to do the body instantiations. This activity
217 -- is part of Inline, since the processing occurs at the same point, and
218 -- for essentially the same reason, as the handling of inlined routines.
220 ----------------------------------------------
221 -- Detection of Instantiation Circularities --
222 ----------------------------------------------
224 -- If we have a chain of instantiations that is circular, this is a
225 -- static error which must be detected at compile time. The detection
226 -- of these circularities is carried out at the point that we insert
227 -- a generic instance spec or body. If there is a circularity, then
228 -- the analysis of the offending spec or body will eventually result
229 -- in trying to load the same unit again, and we detect this problem
230 -- as we analyze the package instantiation for the second time.
232 -- At least in some cases after we have detected the circularity, we
233 -- get into trouble if we try to keep going. The following flag is
234 -- set if a circularity is detected, and used to abandon compilation
235 -- after the messages have been posted.
237 Circularity_Detected
: Boolean := False;
238 -- This should really be reset on encountering a new main unit, but in
239 -- practice we are not using multiple main units so it is not critical.
241 -----------------------
242 -- Local subprograms --
243 -----------------------
245 procedure Abandon_Instantiation
(N
: Node_Id
);
246 pragma No_Return
(Abandon_Instantiation
);
247 -- Posts an error message "instantiation abandoned" at the indicated
248 -- node and then raises the exception Instantiation_Error to do it.
250 procedure Analyze_Formal_Array_Type
251 (T
: in out Entity_Id
;
253 -- A formal array type is treated like an array type declaration, and
254 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
255 -- in-out, because in the case of an anonymous type the entity is
256 -- actually created in the procedure.
258 -- The following procedures treat other kinds of formal parameters
260 procedure Analyze_Formal_Derived_Type
265 -- The following subprograms create abbreviated declarations for formal
266 -- scalar types. We introduce an anonymous base of the proper class for
267 -- each of them, and define the formals as constrained first subtypes of
268 -- their bases. The bounds are expressions that are non-static in the
271 procedure Analyze_Formal_Decimal_Fixed_Point_Type
272 (T
: Entity_Id
; Def
: Node_Id
);
273 procedure Analyze_Formal_Discrete_Type
(T
: Entity_Id
; Def
: Node_Id
);
274 procedure Analyze_Formal_Floating_Type
(T
: Entity_Id
; Def
: Node_Id
);
275 procedure Analyze_Formal_Signed_Integer_Type
(T
: Entity_Id
; Def
: Node_Id
);
276 procedure Analyze_Formal_Modular_Type
(T
: Entity_Id
; Def
: Node_Id
);
277 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
278 (T
: Entity_Id
; Def
: Node_Id
);
280 procedure Analyze_Formal_Private_Type
284 -- This needs comments???
286 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
);
288 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
);
289 -- This needs comments ???
291 function Analyze_Associations
294 F_Copy
: List_Id
) return List_Id
;
295 -- At instantiation time, build the list of associations between formals
296 -- and actuals. Each association becomes a renaming declaration for the
297 -- formal entity. F_Copy is the analyzed list of formals in the generic
298 -- copy. It is used to apply legality checks to the actuals. I_Node is the
299 -- instantiation node itself.
301 procedure Analyze_Subprogram_Instantiation
305 procedure Build_Instance_Compilation_Unit_Nodes
309 -- This procedure is used in the case where the generic instance of a
310 -- subprogram body or package body is a library unit. In this case, the
311 -- original library unit node for the generic instantiation must be
312 -- replaced by the resulting generic body, and a link made to a new
313 -- compilation unit node for the generic declaration. The argument N is
314 -- the original generic instantiation. Act_Body and Act_Decl are the body
315 -- and declaration of the instance (either package body and declaration
316 -- nodes or subprogram body and declaration nodes depending on the case).
317 -- On return, the node N has been rewritten with the actual body.
319 procedure Check_Formal_Packages
(P_Id
: Entity_Id
);
320 -- Apply the following to all formal packages in generic associations
322 procedure Check_Formal_Package_Instance
323 (Formal_Pack
: Entity_Id
;
324 Actual_Pack
: Entity_Id
);
325 -- Verify that the actuals of the actual instance match the actuals of
326 -- the template for a formal package that is not declared with a box.
328 procedure Check_Forward_Instantiation
(Decl
: Node_Id
);
329 -- If the generic is a local entity and the corresponding body has not
330 -- been seen yet, flag enclosing packages to indicate that it will be
331 -- elaborated after the generic body. Subprograms declared in the same
332 -- package cannot be inlined by the front-end because front-end inlining
333 -- requires a strict linear order of elaboration.
335 procedure Check_Hidden_Child_Unit
337 Gen_Unit
: Entity_Id
;
338 Act_Decl_Id
: Entity_Id
);
339 -- If the generic unit is an implicit child instance within a parent
340 -- instance, we need to make an explicit test that it is not hidden by
341 -- a child instance of the same name and parent.
343 procedure Check_Private_View
(N
: Node_Id
);
344 -- Check whether the type of a generic entity has a different view between
345 -- the point of generic analysis and the point of instantiation. If the
346 -- view has changed, then at the point of instantiation we restore the
347 -- correct view to perform semantic analysis of the instance, and reset
348 -- the current view after instantiation. The processing is driven by the
349 -- current private status of the type of the node, and Has_Private_View,
350 -- a flag that is set at the point of generic compilation. If view and
351 -- flag are inconsistent then the type is updated appropriately.
353 procedure Check_Generic_Actuals
354 (Instance
: Entity_Id
;
355 Is_Formal_Box
: Boolean);
356 -- Similar to previous one. Check the actuals in the instantiation,
357 -- whose views can change between the point of instantiation and the point
358 -- of instantiation of the body. In addition, mark the generic renamings
359 -- as generic actuals, so that they are not compatible with other actuals.
360 -- Recurse on an actual that is a formal package whose declaration has
363 function Contains_Instance_Of
366 N
: Node_Id
) return Boolean;
367 -- Inner is instantiated within the generic Outer. Check whether Inner
368 -- directly or indirectly contains an instance of Outer or of one of its
369 -- parents, in the case of a subunit. Each generic unit holds a list of
370 -- the entities instantiated within (at any depth). This procedure
371 -- determines whether the set of such lists contains a cycle, i.e. an
372 -- illegal circular instantiation.
374 function Denotes_Formal_Package
376 On_Exit
: Boolean := False) return Boolean;
377 -- Returns True if E is a formal package of an enclosing generic, or
378 -- the actual for such a formal in an enclosing instantiation. If such
379 -- a package is used as a formal in an nested generic, or as an actual
380 -- in a nested instantiation, the visibility of ITS formals should not
381 -- be modified. When called from within Restore_Private_Views, the flag
382 -- On_Exit is true, to indicate that the search for a possible enclosing
383 -- instance should ignore the current one.
385 function Find_Actual_Type
387 Gen_Scope
: Entity_Id
) return Entity_Id
;
388 -- When validating the actual types of a child instance, check whether
389 -- the formal is a formal type of the parent unit, and retrieve the current
390 -- actual for it. Typ is the entity in the analyzed formal type declaration
391 -- (component or index type of an array type) and Gen_Scope is the scope of
392 -- the analyzed formal array type.
394 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
;
395 -- Given the entity of a unit that is an instantiation, retrieve the
396 -- original instance node. This is used when loading the instantiations
397 -- of the ancestors of a child generic that is being instantiated.
399 function In_Same_Declarative_Part
401 Inst
: Node_Id
) return Boolean;
402 -- True if the instantiation Inst and the given freeze_node F_Node appear
403 -- within the same declarative part, ignoring subunits, but with no inter-
404 -- vening suprograms or concurrent units. If true, the freeze node
405 -- of the instance can be placed after the freeze node of the parent,
406 -- which it itself an instance.
408 function In_Main_Context
(E
: Entity_Id
) return Boolean;
409 -- Check whether an instantiation is in the context of the main unit.
410 -- Used to determine whether its body should be elaborated to allow
411 -- front-end inlining.
413 procedure Set_Instance_Env
414 (Gen_Unit
: Entity_Id
;
415 Act_Unit
: Entity_Id
);
416 -- Save current instance on saved environment, to be used to determine
417 -- the global status of entities in nested instances. Part of Save_Env.
418 -- called after verifying that the generic unit is legal for the instance.
420 procedure Set_Instance_Of
(A
: Entity_Id
; B
: Entity_Id
);
421 -- Associate analyzed generic parameter with corresponding
422 -- instance. Used for semantic checks at instantiation time.
424 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean;
425 -- Traverse the Exchanged_Views list to see if a type was private
426 -- and has already been flipped during this phase of instantiation.
428 procedure Hide_Current_Scope
;
429 -- When compiling a generic child unit, the parent context must be
430 -- present, but the instance and all entities that may be generated
431 -- must be inserted in the current scope. We leave the current scope
432 -- on the stack, but make its entities invisible to avoid visibility
433 -- problems. This is reversed at the end of instantiations. This is
434 -- not done for the instantiation of the bodies, which only require the
435 -- instances of the generic parents to be in scope.
437 procedure Install_Body
442 -- If the instantiation happens textually before the body of the generic,
443 -- the instantiation of the body must be analyzed after the generic body,
444 -- and not at the point of instantiation. Such early instantiations can
445 -- happen if the generic and the instance appear in a package declaration
446 -- because the generic body can only appear in the corresponding package
447 -- body. Early instantiations can also appear if generic, instance and
448 -- body are all in the declarative part of a subprogram or entry. Entities
449 -- of packages that are early instantiations are delayed, and their freeze
450 -- node appears after the generic body.
452 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
);
453 -- Insert freeze node at the end of the declarative part that includes the
454 -- instance node N. If N is in the visible part of an enclosing package
455 -- declaration, the freeze node has to be inserted at the end of the
456 -- private declarations, if any.
458 procedure Freeze_Subprogram_Body
459 (Inst_Node
: Node_Id
;
461 Pack_Id
: Entity_Id
);
462 -- The generic body may appear textually after the instance, including
463 -- in the proper body of a stub, or within a different package instance.
464 -- Given that the instance can only be elaborated after the generic, we
465 -- place freeze_nodes for the instance and/or for packages that may enclose
466 -- the instance and the generic, so that the back-end can establish the
467 -- proper order of elaboration.
470 -- Establish environment for subsequent instantiation. Separated from
471 -- Save_Env because data-structures for visibility handling must be
472 -- initialized before call to Check_Generic_Child_Unit.
474 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False);
475 -- When compiling an instance of a child unit the parent (which is
476 -- itself an instance) is an enclosing scope that must be made
477 -- immediately visible. This procedure is also used to install the non-
478 -- generic parent of a generic child unit when compiling its body, so
479 -- that full views of types in the parent are made visible.
481 procedure Remove_Parent
(In_Body
: Boolean := False);
482 -- Reverse effect after instantiation of child is complete
484 procedure Inline_Instance_Body
486 Gen_Unit
: Entity_Id
;
488 -- If front-end inlining is requested, instantiate the package body,
489 -- and preserve the visibility of its compilation unit, to insure
490 -- that successive instantiations succeed.
492 -- The functions Instantiate_XXX perform various legality checks and build
493 -- the declarations for instantiated generic parameters. In all of these
494 -- Formal is the entity in the generic unit, Actual is the entity of
495 -- expression in the generic associations, and Analyzed_Formal is the
496 -- formal in the generic copy, which contains the semantic information to
497 -- be used to validate the actual.
499 function Instantiate_Object
502 Analyzed_Formal
: Node_Id
) return List_Id
;
504 function Instantiate_Type
507 Analyzed_Formal
: Node_Id
;
508 Actual_Decls
: List_Id
) return Node_Id
;
510 function Instantiate_Formal_Subprogram
513 Analyzed_Formal
: Node_Id
) return Node_Id
;
515 function Instantiate_Formal_Package
518 Analyzed_Formal
: Node_Id
) return List_Id
;
519 -- If the formal package is declared with a box, special visibility rules
520 -- apply to its formals: they are in the visible part of the package. This
521 -- is true in the declarative region of the formal package, that is to say
522 -- in the enclosing generic or instantiation. For an instantiation, the
523 -- parameters of the formal package are made visible in an explicit step.
524 -- Furthermore, if the actual is a visible use_clause, these formals must
525 -- be made potentially use_visible as well. On exit from the enclosing
526 -- instantiation, the reverse must be done.
528 -- For a formal package declared without a box, there are conformance rules
529 -- that apply to the actuals in the generic declaration and the actuals of
530 -- the actual package in the enclosing instantiation. The simplest way to
531 -- apply these rules is to repeat the instantiation of the formal package
532 -- in the context of the enclosing instance, and compare the generic
533 -- associations of this instantiation with those of the actual package.
535 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean;
536 -- Test if given node is in the main unit
538 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
);
539 -- If the generic appears in a separate non-generic library unit,
540 -- load the corresponding body to retrieve the body of the generic.
541 -- N is the node for the generic instantiation, Spec is the generic
542 -- package declaration.
544 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
);
545 -- Add the context clause of the unit containing a generic unit to
546 -- an instantiation that is a compilation unit.
548 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
;
549 -- In order to propagate semantic information back from the analyzed
550 -- copy to the original generic, we maintain links between selected nodes
551 -- in the generic and their corresponding copies. At the end of generic
552 -- analysis, the routine Save_Global_References traverses the generic
553 -- tree, examines the semantic information, and preserves the links to
554 -- those nodes that contain global information. At instantiation, the
555 -- information from the associated node is placed on the new copy, so
556 -- that name resolution is not repeated.
558 -- Three kinds of source nodes have associated nodes:
560 -- a) those that can reference (denote) entities, that is identifiers,
561 -- character literals, expanded_names, operator symbols, operators,
562 -- and attribute reference nodes. These nodes have an Entity field
563 -- and are the set of nodes that are in N_Has_Entity.
565 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
567 -- c) selected components (N_Selected_Component)
569 -- For the first class, the associated node preserves the entity if it is
570 -- global. If the generic contains nested instantiations, the associated
571 -- node itself has been recopied, and a chain of them must be followed.
573 -- For aggregates, the associated node allows retrieval of the type, which
574 -- may otherwise not appear in the generic. The view of this type may be
575 -- different between generic and instantiation, and the full view can be
576 -- installed before the instantiation is analyzed. For aggregates of
577 -- type extensions, the same view exchange may have to be performed for
578 -- some of the ancestor types, if their view is private at the point of
581 -- Nodes that are selected components in the parse tree may be rewritten
582 -- as expanded names after resolution, and must be treated as potential
583 -- entity holders. which is why they also have an Associated_Node.
585 -- Nodes that do not come from source, such as freeze nodes, do not appear
586 -- in the generic tree, and need not have an associated node.
588 -- The associated node is stored in the Associated_Node field. Note that
589 -- this field overlaps Entity, which is fine, because the whole point is
590 -- that we don't need or want the normal Entity field in this situation.
592 procedure Move_Freeze_Nodes
596 -- Freeze nodes can be generated in the analysis of a generic unit, but
597 -- will not be seen by the back-end. It is necessary to move those nodes
598 -- to the enclosing scope if they freeze an outer entity. We place them
599 -- at the end of the enclosing generic package, which is semantically
602 procedure Pre_Analyze_Actuals
(N
: Node_Id
);
603 -- Analyze actuals to perform name resolution. Full resolution is done
604 -- later, when the expected types are known, but names have to be captured
605 -- before installing parents of generics, that are not visible for the
606 -- actuals themselves.
608 procedure Valid_Default_Attribute
(Nam
: Entity_Id
; Def
: Node_Id
);
609 -- Verify that an attribute that appears as the default for a formal
610 -- subprogram is a function or procedure with the correct profile.
612 -------------------------------------------
613 -- Data Structures for Generic Renamings --
614 -------------------------------------------
616 -- The map Generic_Renamings associates generic entities with their
617 -- corresponding actuals. Currently used to validate type instances.
618 -- It will eventually be used for all generic parameters to eliminate
619 -- the need for overload resolution in the instance.
621 type Assoc_Ptr
is new Int
;
623 Assoc_Null
: constant Assoc_Ptr
:= -1;
628 Next_In_HTable
: Assoc_Ptr
;
631 package Generic_Renamings
is new Table
.Table
632 (Table_Component_Type
=> Assoc
,
633 Table_Index_Type
=> Assoc_Ptr
,
634 Table_Low_Bound
=> 0,
636 Table_Increment
=> 100,
637 Table_Name
=> "Generic_Renamings");
639 -- Variable to hold enclosing instantiation. When the environment is
640 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
642 Current_Instantiated_Parent
: Assoc
:= (Empty
, Empty
, Assoc_Null
);
644 -- Hash table for associations
646 HTable_Size
: constant := 37;
647 type HTable_Range
is range 0 .. HTable_Size
- 1;
649 procedure Set_Next_Assoc
(E
: Assoc_Ptr
; Next
: Assoc_Ptr
);
650 function Next_Assoc
(E
: Assoc_Ptr
) return Assoc_Ptr
;
651 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
;
652 function Hash
(F
: Entity_Id
) return HTable_Range
;
654 package Generic_Renamings_HTable
is new GNAT
.HTable
.Static_HTable
(
655 Header_Num
=> HTable_Range
,
657 Elmt_Ptr
=> Assoc_Ptr
,
658 Null_Ptr
=> Assoc_Null
,
659 Set_Next
=> Set_Next_Assoc
,
662 Get_Key
=> Get_Gen_Id
,
666 Exchanged_Views
: Elist_Id
;
667 -- This list holds the private views that have been exchanged during
668 -- instantiation to restore the visibility of the generic declaration.
669 -- (see comments above). After instantiation, the current visibility is
670 -- reestablished by means of a traversal of this list.
672 Hidden_Entities
: Elist_Id
;
673 -- This list holds the entities of the current scope that are removed
674 -- from immediate visibility when instantiating a child unit. Their
675 -- visibility is restored in Remove_Parent.
677 -- Because instantiations can be recursive, the following must be saved
678 -- on entry and restored on exit from an instantiation (spec or body).
679 -- This is done by the two procedures Save_Env and Restore_Env. For
680 -- package and subprogram instantiations (but not for the body instances)
681 -- the action of Save_Env is done in two steps: Init_Env is called before
682 -- Check_Generic_Child_Unit, because setting the parent instances requires
683 -- that the visibility data structures be properly initialized. Once the
684 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
686 Parent_Unit_Visible
: Boolean := False;
687 -- Parent_Unit_Visible is used when the generic is a child unit, and
688 -- indicates whether the ultimate parent of the generic is visible in the
689 -- instantiation environment. It is used to reset the visiblity of the
690 -- parent at the end of the instantiation (see Remove_Parent).
692 type Instance_Env
is record
693 Ada_Version
: 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
);
1701 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
1703 Set_Defining_Unit_Name
(Specification
(New_N
), Formal
);
1704 Set_Instance_Env
(Gen_Unit
, Formal
);
1706 Enter_Name
(Formal
);
1707 Set_Ekind
(Formal
, E_Generic_Package
);
1708 Set_Etype
(Formal
, Standard_Void_Type
);
1709 Set_Inner_Instances
(Formal
, New_Elmt_List
);
1712 -- Within the formal, the name of the generic package is a renaming
1713 -- of the formal (as for a regular instantiation).
1715 Renaming
:= Make_Package_Renaming_Declaration
(Loc
,
1716 Defining_Unit_Name
=>
1717 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
1718 Name
=> New_Reference_To
(Formal
, Loc
));
1720 if Present
(Visible_Declarations
(Specification
(N
))) then
1721 Prepend
(Renaming
, To
=> Visible_Declarations
(Specification
(N
)));
1722 elsif Present
(Private_Declarations
(Specification
(N
))) then
1723 Prepend
(Renaming
, To
=> Private_Declarations
(Specification
(N
)));
1726 if Is_Child_Unit
(Gen_Unit
)
1727 and then Parent_Installed
1729 -- Similarly, we have to make the name of the formal visible in
1730 -- the parent instance, to resolve properly fully qualified names
1731 -- that may appear in the generic unit. The parent instance has
1732 -- been placed on the scope stack ahead of the current scope.
1734 Parent_Instance
:= Scope_Stack
.Table
(Scope_Stack
.Last
- 1).Entity
;
1737 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
));
1738 Set_Ekind
(Renaming_In_Par
, E_Package
);
1739 Set_Etype
(Renaming_In_Par
, Standard_Void_Type
);
1740 Set_Scope
(Renaming_In_Par
, Parent_Instance
);
1741 Set_Parent
(Renaming_In_Par
, Parent
(Formal
));
1742 Set_Renamed_Object
(Renaming_In_Par
, Formal
);
1743 Append_Entity
(Renaming_In_Par
, Parent_Instance
);
1746 Analyze_Generic_Formal_Part
(N
);
1747 Analyze
(Specification
(N
));
1748 End_Package_Scope
(Formal
);
1750 if Parent_Installed
then
1756 -- Inside the generic unit, the formal package is a regular
1757 -- package, but no body is needed for it. Note that after
1758 -- instantiation, the defining_unit_name we need is in the
1759 -- new tree and not in the original. (see Package_Instantiation).
1760 -- A generic formal package is an instance, and can be used as
1761 -- an actual for an inner instance. Mark its generic parent.
1763 Set_Ekind
(Formal
, E_Package
);
1764 Set_Generic_Parent
(Specification
(N
), Gen_Unit
);
1765 Set_Has_Completion
(Formal
, True);
1767 Set_Ekind
(Pack_Id
, E_Package
);
1768 Set_Etype
(Pack_Id
, Standard_Void_Type
);
1769 Set_Scope
(Pack_Id
, Scope
(Formal
));
1770 Set_Has_Completion
(Pack_Id
, True);
1772 end Analyze_Formal_Package
;
1774 ---------------------------------
1775 -- Analyze_Formal_Private_Type --
1776 ---------------------------------
1778 procedure Analyze_Formal_Private_Type
1784 New_Private_Type
(N
, T
, Def
);
1786 -- Set the size to an arbitrary but legal value
1788 Set_Size_Info
(T
, Standard_Integer
);
1789 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1790 end Analyze_Formal_Private_Type
;
1792 ----------------------------------------
1793 -- Analyze_Formal_Signed_Integer_Type --
1794 ----------------------------------------
1796 procedure Analyze_Formal_Signed_Integer_Type
1800 Base
: constant Entity_Id
:=
1802 (E_Signed_Integer_Type
, Current_Scope
, Sloc
(Def
), 'G');
1807 Set_Ekind
(T
, E_Signed_Integer_Subtype
);
1808 Set_Etype
(T
, Base
);
1809 Set_Size_Info
(T
, Standard_Integer
);
1810 Set_RM_Size
(T
, RM_Size
(Standard_Integer
));
1811 Set_Scalar_Range
(T
, Scalar_Range
(Standard_Integer
));
1812 Set_Is_Constrained
(T
);
1814 Set_Is_Generic_Type
(Base
);
1815 Set_Size_Info
(Base
, Standard_Integer
);
1816 Set_RM_Size
(Base
, RM_Size
(Standard_Integer
));
1817 Set_Etype
(Base
, Base
);
1818 Set_Scalar_Range
(Base
, Scalar_Range
(Standard_Integer
));
1819 Set_Parent
(Base
, Parent
(Def
));
1820 end Analyze_Formal_Signed_Integer_Type
;
1822 -------------------------------
1823 -- Analyze_Formal_Subprogram --
1824 -------------------------------
1826 procedure Analyze_Formal_Subprogram
(N
: Node_Id
) is
1827 Spec
: constant Node_Id
:= Specification
(N
);
1828 Def
: constant Node_Id
:= Default_Name
(N
);
1829 Nam
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
1837 if Nkind
(Nam
) = N_Defining_Program_Unit_Name
then
1838 Error_Msg_N
("name of formal subprogram must be a direct name", Nam
);
1842 Analyze_Subprogram_Declaration
(N
);
1843 Set_Is_Formal_Subprogram
(Nam
);
1844 Set_Has_Completion
(Nam
);
1846 if Nkind
(N
) = N_Formal_Abstract_Subprogram_Declaration
then
1847 Set_Is_Abstract
(Nam
);
1848 Set_Is_Dispatching_Operation
(Nam
);
1851 Ctrl_Type
: constant Entity_Id
:= Find_Dispatching_Type
(Nam
);
1854 if not Present
(Ctrl_Type
) then
1856 ("abstract formal subprogram must have a controlling type",
1860 Check_Controlling_Formals
(Ctrl_Type
, Nam
);
1865 -- Default name is resolved at the point of instantiation
1867 if Box_Present
(N
) then
1870 -- Else default is bound at the point of generic declaration
1872 elsif Present
(Def
) then
1873 if Nkind
(Def
) = N_Operator_Symbol
then
1874 Find_Direct_Name
(Def
);
1876 elsif Nkind
(Def
) /= N_Attribute_Reference
then
1880 -- For an attribute reference, analyze the prefix and verify
1881 -- that it has the proper profile for the subprogram.
1883 Analyze
(Prefix
(Def
));
1884 Valid_Default_Attribute
(Nam
, Def
);
1888 -- Default name may be overloaded, in which case the interpretation
1889 -- with the correct profile must be selected, as for a renaming.
1891 if Etype
(Def
) = Any_Type
then
1894 elsif Nkind
(Def
) = N_Selected_Component
then
1895 Subp
:= Entity
(Selector_Name
(Def
));
1897 if Ekind
(Subp
) /= E_Entry
then
1898 Error_Msg_N
("expect valid subprogram name as default", Def
);
1902 elsif Nkind
(Def
) = N_Indexed_Component
then
1904 if Nkind
(Prefix
(Def
)) /= N_Selected_Component
then
1905 Error_Msg_N
("expect valid subprogram name as default", Def
);
1909 Subp
:= Entity
(Selector_Name
(Prefix
(Def
)));
1911 if Ekind
(Subp
) /= E_Entry_Family
then
1912 Error_Msg_N
("expect valid subprogram name as default", Def
);
1917 elsif Nkind
(Def
) = N_Character_Literal
then
1919 -- Needs some type checks: subprogram should be parameterless???
1921 Resolve
(Def
, (Etype
(Nam
)));
1923 elsif not Is_Entity_Name
(Def
)
1924 or else not Is_Overloadable
(Entity
(Def
))
1926 Error_Msg_N
("expect valid subprogram name as default", Def
);
1929 elsif not Is_Overloaded
(Def
) then
1930 Subp
:= Entity
(Def
);
1933 Error_Msg_N
("premature usage of formal subprogram", Def
);
1935 elsif not Entity_Matches_Spec
(Subp
, Nam
) then
1936 Error_Msg_N
("no visible entity matches specification", Def
);
1942 I1
: Interp_Index
:= 0;
1948 Get_First_Interp
(Def
, I
, It
);
1949 while Present
(It
.Nam
) loop
1951 if Entity_Matches_Spec
(It
.Nam
, Nam
) then
1952 if Subp
/= Any_Id
then
1953 It1
:= Disambiguate
(Def
, I1
, I
, Etype
(Subp
));
1955 if It1
= No_Interp
then
1956 Error_Msg_N
("ambiguous default subprogram", Def
);
1969 Get_Next_Interp
(I
, It
);
1973 if Subp
/= Any_Id
then
1974 Set_Entity
(Def
, Subp
);
1977 Error_Msg_N
("premature usage of formal subprogram", Def
);
1979 elsif Ekind
(Subp
) /= E_Operator
then
1980 Check_Mode_Conformant
(Subp
, Nam
);
1984 Error_Msg_N
("no visible subprogram matches specification", N
);
1988 end Analyze_Formal_Subprogram
;
1990 -------------------------------------
1991 -- Analyze_Formal_Type_Declaration --
1992 -------------------------------------
1994 procedure Analyze_Formal_Type_Declaration
(N
: Node_Id
) is
1995 Def
: constant Node_Id
:= Formal_Type_Definition
(N
);
1999 T
:= Defining_Identifier
(N
);
2001 if Present
(Discriminant_Specifications
(N
))
2002 and then Nkind
(Def
) /= N_Formal_Private_Type_Definition
2005 ("discriminants not allowed for this formal type",
2006 Defining_Identifier
(First
(Discriminant_Specifications
(N
))));
2009 -- Enter the new name, and branch to specific routine
2012 when N_Formal_Private_Type_Definition
=>
2013 Analyze_Formal_Private_Type
(N
, T
, Def
);
2015 when N_Formal_Derived_Type_Definition
=>
2016 Analyze_Formal_Derived_Type
(N
, T
, Def
);
2018 when N_Formal_Discrete_Type_Definition
=>
2019 Analyze_Formal_Discrete_Type
(T
, Def
);
2021 when N_Formal_Signed_Integer_Type_Definition
=>
2022 Analyze_Formal_Signed_Integer_Type
(T
, Def
);
2024 when N_Formal_Modular_Type_Definition
=>
2025 Analyze_Formal_Modular_Type
(T
, Def
);
2027 when N_Formal_Floating_Point_Definition
=>
2028 Analyze_Formal_Floating_Type
(T
, Def
);
2030 when N_Formal_Ordinary_Fixed_Point_Definition
=>
2031 Analyze_Formal_Ordinary_Fixed_Point_Type
(T
, Def
);
2033 when N_Formal_Decimal_Fixed_Point_Definition
=>
2034 Analyze_Formal_Decimal_Fixed_Point_Type
(T
, Def
);
2036 when N_Array_Type_Definition
=>
2037 Analyze_Formal_Array_Type
(T
, Def
);
2039 when N_Access_To_Object_Definition |
2040 N_Access_Function_Definition |
2041 N_Access_Procedure_Definition
=>
2042 Analyze_Generic_Access_Type
(T
, Def
);
2048 raise Program_Error
;
2052 Set_Is_Generic_Type
(T
);
2053 end Analyze_Formal_Type_Declaration
;
2055 ------------------------------------
2056 -- Analyze_Function_Instantiation --
2057 ------------------------------------
2059 procedure Analyze_Function_Instantiation
(N
: Node_Id
) is
2061 Analyze_Subprogram_Instantiation
(N
, E_Function
);
2062 end Analyze_Function_Instantiation
;
2064 ---------------------------------
2065 -- Analyze_Generic_Access_Type --
2066 ---------------------------------
2068 procedure Analyze_Generic_Access_Type
(T
: Entity_Id
; Def
: Node_Id
) is
2072 if Nkind
(Def
) = N_Access_To_Object_Definition
then
2073 Access_Type_Declaration
(T
, Def
);
2075 if Is_Incomplete_Or_Private_Type
(Designated_Type
(T
))
2076 and then No
(Full_View
(Designated_Type
(T
)))
2077 and then not Is_Generic_Type
(Designated_Type
(T
))
2079 Error_Msg_N
("premature usage of incomplete type", Def
);
2081 elsif Is_Internal
(Designated_Type
(T
)) then
2083 ("only a subtype mark is allowed in a formal", Def
);
2087 Access_Subprogram_Declaration
(T
, Def
);
2089 end Analyze_Generic_Access_Type
;
2091 ---------------------------------
2092 -- Analyze_Generic_Formal_Part --
2093 ---------------------------------
2095 procedure Analyze_Generic_Formal_Part
(N
: Node_Id
) is
2096 Gen_Parm_Decl
: Node_Id
;
2099 -- The generic formals are processed in the scope of the generic
2100 -- unit, where they are immediately visible. The scope is installed
2103 Gen_Parm_Decl
:= First
(Generic_Formal_Declarations
(N
));
2105 while Present
(Gen_Parm_Decl
) loop
2106 Analyze
(Gen_Parm_Decl
);
2107 Next
(Gen_Parm_Decl
);
2110 Generate_Reference_To_Generic_Formals
(Current_Scope
);
2111 end Analyze_Generic_Formal_Part
;
2113 ------------------------------------------
2114 -- Analyze_Generic_Package_Declaration --
2115 ------------------------------------------
2117 procedure Analyze_Generic_Package_Declaration
(N
: Node_Id
) is
2118 Loc
: constant Source_Ptr
:= Sloc
(N
);
2121 Save_Parent
: Node_Id
;
2123 Decls
: constant List_Id
:=
2124 Visible_Declarations
(Specification
(N
));
2128 -- We introduce a renaming of the enclosing package, to have a usable
2129 -- entity as the prefix of an expanded name for a local entity of the
2130 -- form Par.P.Q, where P is the generic package. This is because a local
2131 -- entity named P may hide it, so that the usual visibility rules in
2132 -- the instance will not resolve properly.
2135 Make_Package_Renaming_Declaration
(Loc
,
2136 Defining_Unit_Name
=>
2137 Make_Defining_Identifier
(Loc
,
2138 Chars
=> New_External_Name
(Chars
(Defining_Entity
(N
)), "GH")),
2139 Name
=> Make_Identifier
(Loc
, Chars
(Defining_Entity
(N
))));
2141 if Present
(Decls
) then
2142 Decl
:= First
(Decls
);
2143 while Present
(Decl
)
2144 and then Nkind
(Decl
) = N_Pragma
2149 if Present
(Decl
) then
2150 Insert_Before
(Decl
, Renaming
);
2152 Append
(Renaming
, Visible_Declarations
(Specification
(N
)));
2156 Set_Visible_Declarations
(Specification
(N
), New_List
(Renaming
));
2159 -- Create copy of generic unit, and save for instantiation.
2160 -- If the unit is a child unit, do not copy the specifications
2161 -- for the parent, which are not part of the generic tree.
2163 Save_Parent
:= Parent_Spec
(N
);
2164 Set_Parent_Spec
(N
, Empty
);
2166 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2167 Set_Parent_Spec
(New_N
, Save_Parent
);
2169 Id
:= Defining_Entity
(N
);
2170 Generate_Definition
(Id
);
2172 -- Expansion is not applied to generic units
2177 Set_Ekind
(Id
, E_Generic_Package
);
2178 Set_Etype
(Id
, Standard_Void_Type
);
2180 Enter_Generic_Scope
(Id
);
2181 Set_Inner_Instances
(Id
, New_Elmt_List
);
2183 Set_Categorization_From_Pragmas
(N
);
2184 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2186 -- Link the declaration of the generic homonym in the generic copy
2187 -- to the package it renames, so that it is always resolved properly.
2189 Set_Generic_Homonym
(Id
, Defining_Unit_Name
(Renaming
));
2190 Set_Entity
(Associated_Node
(Name
(Renaming
)), Id
);
2192 -- For a library unit, we have reconstructed the entity for the
2193 -- unit, and must reset it in the library tables.
2195 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2196 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2199 Analyze_Generic_Formal_Part
(N
);
2201 -- After processing the generic formals, analysis proceeds
2202 -- as for a non-generic package.
2204 Analyze
(Specification
(N
));
2206 Validate_Categorization_Dependency
(N
, Id
);
2210 End_Package_Scope
(Id
);
2211 Exit_Generic_Scope
(Id
);
2213 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2214 Move_Freeze_Nodes
(Id
, N
, Visible_Declarations
(Specification
(N
)));
2215 Move_Freeze_Nodes
(Id
, N
, Private_Declarations
(Specification
(N
)));
2216 Move_Freeze_Nodes
(Id
, N
, Generic_Formal_Declarations
(N
));
2219 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2220 Validate_RT_RAT_Component
(N
);
2222 -- If this is a spec without a body, check that generic parameters
2225 if not Body_Required
(Parent
(N
)) then
2226 Check_References
(Id
);
2229 end Analyze_Generic_Package_Declaration
;
2231 --------------------------------------------
2232 -- Analyze_Generic_Subprogram_Declaration --
2233 --------------------------------------------
2235 procedure Analyze_Generic_Subprogram_Declaration
(N
: Node_Id
) is
2240 Save_Parent
: Node_Id
;
2243 -- Create copy of generic unit,and save for instantiation.
2244 -- If the unit is a child unit, do not copy the specifications
2245 -- for the parent, which are not part of the generic tree.
2247 Save_Parent
:= Parent_Spec
(N
);
2248 Set_Parent_Spec
(N
, Empty
);
2250 New_N
:= Copy_Generic_Node
(N
, Empty
, Instantiating
=> False);
2251 Set_Parent_Spec
(New_N
, Save_Parent
);
2254 Spec
:= Specification
(N
);
2255 Id
:= Defining_Entity
(Spec
);
2256 Generate_Definition
(Id
);
2258 if Nkind
(Id
) = N_Defining_Operator_Symbol
then
2260 ("operator symbol not allowed for generic subprogram", Id
);
2267 Set_Scope_Depth_Value
(Id
, Scope_Depth
(Current_Scope
) + 1);
2269 Enter_Generic_Scope
(Id
);
2270 Set_Inner_Instances
(Id
, New_Elmt_List
);
2271 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
2273 Analyze_Generic_Formal_Part
(N
);
2275 Formals
:= Parameter_Specifications
(Spec
);
2277 if Present
(Formals
) then
2278 Process_Formals
(Formals
, Spec
);
2281 if Nkind
(Spec
) = N_Function_Specification
then
2282 Set_Ekind
(Id
, E_Generic_Function
);
2283 Find_Type
(Subtype_Mark
(Spec
));
2284 Set_Etype
(Id
, Entity
(Subtype_Mark
(Spec
)));
2286 Set_Ekind
(Id
, E_Generic_Procedure
);
2287 Set_Etype
(Id
, Standard_Void_Type
);
2290 -- For a library unit, we have reconstructed the entity for the
2291 -- unit, and must reset it in the library tables. We also need
2292 -- to make sure that Body_Required is set properly in the original
2293 -- compilation unit node.
2295 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2296 Set_Cunit_Entity
(Current_Sem_Unit
, Id
);
2297 Set_Body_Required
(Parent
(N
), Unit_Requires_Body
(Id
));
2300 Set_Categorization_From_Pragmas
(N
);
2301 Validate_Categorization_Dependency
(N
, Id
);
2303 Save_Global_References
(Original_Node
(N
));
2307 Exit_Generic_Scope
(Id
);
2308 Generate_Reference_To_Formals
(Id
);
2309 end Analyze_Generic_Subprogram_Declaration
;
2311 -----------------------------------
2312 -- Analyze_Package_Instantiation --
2313 -----------------------------------
2315 -- Note: this procedure is also used for formal package declarations,
2316 -- in which case the argument N is an N_Formal_Package_Declaration
2317 -- node. This should really be noted in the spec! ???
2319 procedure Analyze_Package_Instantiation
(N
: Node_Id
) is
2320 Loc
: constant Source_Ptr
:= Sloc
(N
);
2321 Gen_Id
: constant Node_Id
:= Name
(N
);
2324 Act_Decl_Name
: Node_Id
;
2325 Act_Decl_Id
: Entity_Id
;
2330 Gen_Unit
: Entity_Id
;
2332 Is_Actual_Pack
: constant Boolean :=
2333 Is_Internal
(Defining_Entity
(N
));
2335 Parent_Installed
: Boolean := False;
2336 Renaming_List
: List_Id
;
2337 Unit_Renaming
: Node_Id
;
2338 Needs_Body
: Boolean;
2339 Inline_Now
: Boolean := False;
2341 procedure Delay_Descriptors
(E
: Entity_Id
);
2342 -- Delay generation of subprogram descriptors for given entity
2344 function Might_Inline_Subp
return Boolean;
2345 -- If inlining is active and the generic contains inlined subprograms,
2346 -- we instantiate the body. This may cause superfluous instantiations,
2347 -- but it is simpler than detecting the need for the body at the point
2348 -- of inlining, when the context of the instance is not available.
2350 -----------------------
2351 -- Delay_Descriptors --
2352 -----------------------
2354 procedure Delay_Descriptors
(E
: Entity_Id
) is
2356 if not Delay_Subprogram_Descriptors
(E
) then
2357 Set_Delay_Subprogram_Descriptors
(E
);
2358 Pending_Descriptor
.Increment_Last
;
2359 Pending_Descriptor
.Table
(Pending_Descriptor
.Last
) := E
;
2361 end Delay_Descriptors
;
2363 -----------------------
2364 -- Might_Inline_Subp --
2365 -----------------------
2367 function Might_Inline_Subp
return Boolean is
2371 if not Inline_Processing_Required
then
2375 E
:= First_Entity
(Gen_Unit
);
2376 while Present
(E
) loop
2377 if Is_Subprogram
(E
)
2378 and then Is_Inlined
(E
)
2388 end Might_Inline_Subp
;
2390 -- Start of processing for Analyze_Package_Instantiation
2393 -- Very first thing: apply the special kludge for Text_IO processing
2394 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2396 Text_IO_Kludge
(Name
(N
));
2398 -- Make node global for error reporting
2400 Instantiation_Node
:= N
;
2402 -- Case of instantiation of a generic package
2404 if Nkind
(N
) = N_Package_Instantiation
then
2405 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2406 Set_Comes_From_Source
(Act_Decl_Id
, True);
2408 if Nkind
(Defining_Unit_Name
(N
)) = N_Defining_Program_Unit_Name
then
2410 Make_Defining_Program_Unit_Name
(Loc
,
2411 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(N
))),
2412 Defining_Identifier
=> Act_Decl_Id
);
2414 Act_Decl_Name
:= Act_Decl_Id
;
2417 -- Case of instantiation of a formal package
2420 Act_Decl_Id
:= Defining_Identifier
(N
);
2421 Act_Decl_Name
:= Act_Decl_Id
;
2424 Generate_Definition
(Act_Decl_Id
);
2425 Pre_Analyze_Actuals
(N
);
2428 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
2429 Gen_Unit
:= Entity
(Gen_Id
);
2431 -- Verify that it is the name of a generic package
2433 if Etype
(Gen_Unit
) = Any_Type
then
2437 elsif Ekind
(Gen_Unit
) /= E_Generic_Package
then
2439 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2441 if From_With_Type
(Gen_Unit
) then
2443 ("cannot instantiate a limited withed package", Gen_Id
);
2446 ("expect name of generic package in instantiation", Gen_Id
);
2453 if In_Extended_Main_Source_Unit
(N
) then
2454 Set_Is_Instantiated
(Gen_Unit
);
2455 Generate_Reference
(Gen_Unit
, N
);
2457 if Present
(Renamed_Object
(Gen_Unit
)) then
2458 Set_Is_Instantiated
(Renamed_Object
(Gen_Unit
));
2459 Generate_Reference
(Renamed_Object
(Gen_Unit
), N
);
2463 if Nkind
(Gen_Id
) = N_Identifier
2464 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
2467 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
2469 elsif Nkind
(Gen_Id
) = N_Expanded_Name
2470 and then Is_Child_Unit
(Gen_Unit
)
2471 and then Nkind
(Prefix
(Gen_Id
)) = N_Identifier
2472 and then Chars
(Act_Decl_Id
) = Chars
(Prefix
(Gen_Id
))
2475 ("& is hidden within declaration of instance ", Prefix
(Gen_Id
));
2478 Set_Entity
(Gen_Id
, Gen_Unit
);
2480 -- If generic is a renaming, get original generic unit
2482 if Present
(Renamed_Object
(Gen_Unit
))
2483 and then Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Package
2485 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
2488 -- Verify that there are no circular instantiations
2490 if In_Open_Scopes
(Gen_Unit
) then
2491 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
2495 elsif Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
2496 Error_Msg_Node_2
:= Current_Scope
;
2498 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
2499 Circularity_Detected
:= True;
2504 Set_Instance_Env
(Gen_Unit
, Act_Decl_Id
);
2505 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
2507 -- Initialize renamings map, for error checking, and the list
2508 -- that holds private entities whose views have changed between
2509 -- generic definition and instantiation. If this is the instance
2510 -- created to validate an actual package, the instantiation
2511 -- environment is that of the enclosing instance.
2513 Generic_Renamings
.Set_Last
(0);
2514 Generic_Renamings_HTable
.Reset
;
2516 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
2518 -- Copy original generic tree, to produce text for instantiation
2522 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
2524 Act_Spec
:= Specification
(Act_Tree
);
2526 -- If this is the instance created to validate an actual package,
2527 -- only the formals matter, do not examine the package spec itself.
2529 if Is_Actual_Pack
then
2530 Set_Visible_Declarations
(Act_Spec
, New_List
);
2531 Set_Private_Declarations
(Act_Spec
, New_List
);
2535 Analyze_Associations
2537 Generic_Formal_Declarations
(Act_Tree
),
2538 Generic_Formal_Declarations
(Gen_Decl
));
2540 Set_Defining_Unit_Name
(Act_Spec
, Act_Decl_Name
);
2541 Set_Is_Generic_Instance
(Act_Decl_Id
);
2543 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
2545 -- References to the generic in its own declaration or its body
2546 -- are references to the instance. Add a renaming declaration for
2547 -- the generic unit itself. This declaration, as well as the renaming
2548 -- declarations for the generic formals, must remain private to the
2549 -- unit: the formals, because this is the language semantics, and
2550 -- the unit because its use is an artifact of the implementation.
2553 Make_Package_Renaming_Declaration
(Loc
,
2554 Defining_Unit_Name
=>
2555 Make_Defining_Identifier
(Loc
, Chars
(Gen_Unit
)),
2556 Name
=> New_Reference_To
(Act_Decl_Id
, Loc
));
2558 Append
(Unit_Renaming
, Renaming_List
);
2560 -- The renaming declarations are the first local declarations of
2563 if Is_Non_Empty_List
(Visible_Declarations
(Act_Spec
)) then
2565 (First
(Visible_Declarations
(Act_Spec
)), Renaming_List
);
2567 Set_Visible_Declarations
(Act_Spec
, Renaming_List
);
2571 Make_Package_Declaration
(Loc
,
2572 Specification
=> Act_Spec
);
2574 -- Save the instantiation node, for subsequent instantiation
2575 -- of the body, if there is one and we are generating code for
2576 -- the current unit. Mark the unit as having a body, to avoid
2577 -- a premature error message.
2579 -- We instantiate the body if we are generating code, if we are
2580 -- generating cross-reference information, or if we are building
2581 -- trees for ASIS use.
2584 Enclosing_Body_Present
: Boolean := False;
2585 -- If the generic unit is not a compilation unit, then a body
2586 -- may be present in its parent even if none is required. We
2587 -- create a tentative pending instantiation for the body, which
2588 -- will be discarded if none is actually present.
2593 if Scope
(Gen_Unit
) /= Standard_Standard
2594 and then not Is_Child_Unit
(Gen_Unit
)
2596 Scop
:= Scope
(Gen_Unit
);
2598 while Present
(Scop
)
2599 and then Scop
/= Standard_Standard
2601 if Unit_Requires_Body
(Scop
) then
2602 Enclosing_Body_Present
:= True;
2605 elsif In_Open_Scopes
(Scop
)
2606 and then In_Package_Body
(Scop
)
2608 Enclosing_Body_Present
:= True;
2612 exit when Is_Compilation_Unit
(Scop
);
2613 Scop
:= Scope
(Scop
);
2617 -- If front-end inlining is enabled, and this is a unit for which
2618 -- code will be generated, we instantiate the body at once.
2619 -- This is done if the instance is not the main unit, and if the
2620 -- generic is not a child unit of another generic, to avoid scope
2621 -- problems and the reinstallation of parent instances.
2623 if Front_End_Inlining
2624 and then Expander_Active
2625 and then (not Is_Child_Unit
(Gen_Unit
)
2626 or else not Is_Generic_Unit
(Scope
(Gen_Unit
)))
2627 and then (Is_In_Main_Unit
(N
)
2628 or else In_Main_Context
(Current_Scope
))
2629 and then Nkind
(Parent
(N
)) /= N_Compilation_Unit
2630 and then Might_Inline_Subp
2631 and then not Is_Actual_Pack
2637 (Unit_Requires_Body
(Gen_Unit
)
2638 or else Enclosing_Body_Present
2639 or else Present
(Corresponding_Body
(Gen_Decl
)))
2640 and then (Is_In_Main_Unit
(N
)
2641 or else Might_Inline_Subp
)
2642 and then not Is_Actual_Pack
2643 and then not Inline_Now
2645 and then (Operating_Mode
= Generate_Code
2646 or else (Operating_Mode
= Check_Semantics
2647 and then ASIS_Mode
));
2649 -- If front_end_inlining is enabled, do not instantiate a
2650 -- body if within a generic context.
2652 if (Front_End_Inlining
2653 and then not Expander_Active
)
2654 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
2656 Needs_Body
:= False;
2659 -- If the current context is generic, and the package being
2660 -- instantiated is declared within a formal package, there
2661 -- is no body to instantiate until the enclosing generic is
2662 -- instantiated, and there is an actual for the formal
2663 -- package. If the formal package has parameters, we build a
2664 -- regular package instance for it, that preceeds the original
2665 -- formal package declaration.
2667 if In_Open_Scopes
(Scope
(Scope
(Gen_Unit
))) then
2669 Decl
: constant Node_Id
:=
2671 (Unit_Declaration_Node
(Scope
(Gen_Unit
)));
2673 if Nkind
(Decl
) = N_Formal_Package_Declaration
2674 or else (Nkind
(Decl
) = N_Package_Declaration
2675 and then Is_List_Member
(Decl
)
2676 and then Present
(Next
(Decl
))
2678 Nkind
(Next
(Decl
)) = N_Formal_Package_Declaration
)
2680 Needs_Body
:= False;
2686 -- If we are generating the calling stubs from the instantiation
2687 -- of a generic RCI package, we will not use the body of the
2690 if Distribution_Stub_Mode
= Generate_Caller_Stub_Body
2691 and then Is_Compilation_Unit
(Defining_Entity
(N
))
2693 Needs_Body
:= False;
2698 -- Here is a defence against a ludicrous number of instantiations
2699 -- caused by a circular set of instantiation attempts.
2701 if Pending_Instantiations
.Last
>
2702 Hostparm
.Max_Instantiations
2704 Error_Msg_N
("too many instantiations", N
);
2705 raise Unrecoverable_Error
;
2708 -- Indicate that the enclosing scopes contain an instantiation,
2709 -- and that cleanup actions should be delayed until after the
2710 -- instance body is expanded.
2712 Check_Forward_Instantiation
(Gen_Decl
);
2713 if Nkind
(N
) = N_Package_Instantiation
then
2715 Enclosing_Master
: Entity_Id
:= Current_Scope
;
2718 while Enclosing_Master
/= Standard_Standard
loop
2720 if Ekind
(Enclosing_Master
) = E_Package
then
2721 if Is_Compilation_Unit
(Enclosing_Master
) then
2722 if In_Package_Body
(Enclosing_Master
) then
2724 (Body_Entity
(Enclosing_Master
));
2733 Enclosing_Master
:= Scope
(Enclosing_Master
);
2736 elsif Ekind
(Enclosing_Master
) = E_Generic_Package
then
2737 Enclosing_Master
:= Scope
(Enclosing_Master
);
2739 elsif Is_Generic_Subprogram
(Enclosing_Master
)
2740 or else Ekind
(Enclosing_Master
) = E_Void
2742 -- Cleanup actions will eventually be performed on
2743 -- the enclosing instance, if any. enclosing scope
2744 -- is void in the formal part of a generic subp.
2749 if Ekind
(Enclosing_Master
) = E_Entry
2751 Ekind
(Scope
(Enclosing_Master
)) = E_Protected_Type
2754 Protected_Body_Subprogram
(Enclosing_Master
);
2757 Set_Delay_Cleanups
(Enclosing_Master
);
2759 while Ekind
(Enclosing_Master
) = E_Block
loop
2760 Enclosing_Master
:= Scope
(Enclosing_Master
);
2763 if Is_Subprogram
(Enclosing_Master
) then
2764 Delay_Descriptors
(Enclosing_Master
);
2766 elsif Is_Task_Type
(Enclosing_Master
) then
2768 TBP
: constant Node_Id
:=
2769 Get_Task_Body_Procedure
2773 if Present
(TBP
) then
2774 Delay_Descriptors
(TBP
);
2775 Set_Delay_Cleanups
(TBP
);
2785 -- Make entry in table
2787 Pending_Instantiations
.Increment_Last
;
2788 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
2789 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
2793 Set_Categorization_From_Pragmas
(Act_Decl
);
2795 if Parent_Installed
then
2799 Set_Instance_Spec
(N
, Act_Decl
);
2801 -- If not a compilation unit, insert the package declaration
2802 -- before the original instantiation node.
2804 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2805 Mark_Rewrite_Insertion
(Act_Decl
);
2806 Insert_Before
(N
, Act_Decl
);
2809 -- For an instantiation that is a compilation unit, place
2810 -- declaration on current node so context is complete
2811 -- for analysis (including nested instantiations). It this
2812 -- is the main unit, the declaration eventually replaces the
2813 -- instantiation node. If the instance body is later created, it
2814 -- replaces the instance node, and the declation is attached to
2815 -- it (see Build_Instance_Compilation_Unit_Nodes).
2818 if Cunit_Entity
(Current_Sem_Unit
) = Defining_Entity
(N
) then
2820 -- The entity for the current unit is the newly created one,
2821 -- and all semantic information is attached to it.
2823 Set_Cunit_Entity
(Current_Sem_Unit
, Act_Decl_Id
);
2825 -- If this is the main unit, replace the main entity as well
2827 if Current_Sem_Unit
= Main_Unit
then
2828 Main_Unit_Entity
:= Act_Decl_Id
;
2832 -- There is a problem with inlining here.
2834 Set_Unit
(Parent
(N
), Act_Decl
);
2835 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
2837 Set_Unit
(Parent
(N
), N
);
2838 Set_Body_Required
(Parent
(N
), False);
2840 -- We never need elaboration checks on instantiations, since
2841 -- by definition, the body instantiation is elaborated at the
2842 -- same time as the spec instantiation.
2844 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
2845 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
2848 Check_Elab_Instantiation
(N
);
2850 if ABE_Is_Certain
(N
) and then Needs_Body
then
2851 Pending_Instantiations
.Decrement_Last
;
2853 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
2855 Set_First_Private_Entity
(Defining_Unit_Name
(Unit_Renaming
),
2856 First_Private_Entity
(Act_Decl_Id
));
2858 -- If the instantiation will receive a body, the unit will
2859 -- be transformed into a package body, and receive its own
2860 -- elaboration entity. Otherwise, the nature of the unit is
2861 -- now a package declaration.
2863 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2864 and then not Needs_Body
2866 Rewrite
(N
, Act_Decl
);
2869 if Present
(Corresponding_Body
(Gen_Decl
))
2870 or else Unit_Requires_Body
(Gen_Unit
)
2872 Set_Has_Completion
(Act_Decl_Id
);
2875 Check_Formal_Packages
(Act_Decl_Id
);
2877 Restore_Private_Views
(Act_Decl_Id
);
2879 if not Generic_Separately_Compiled
(Gen_Unit
) then
2880 Inherit_Context
(Gen_Decl
, N
);
2883 if Parent_Installed
then
2890 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
2892 -- Check restriction, but skip this if something went wrong in
2893 -- the above analysis, indicated by Act_Decl_Id being void.
2895 if Ekind
(Act_Decl_Id
) /= E_Void
2896 and then not Is_Library_Level_Entity
(Act_Decl_Id
)
2898 Check_Restriction
(No_Local_Allocators
, N
);
2902 Inline_Instance_Body
(N
, Gen_Unit
, Act_Decl
);
2905 -- The following is a tree patch for ASIS: ASIS needs separate nodes
2906 -- to be used as defining identifiers for a formal package and for the
2907 -- corresponding expanded package
2909 if Nkind
(N
) = N_Formal_Package_Declaration
then
2910 Act_Decl_Id
:= New_Copy
(Defining_Entity
(N
));
2911 Set_Comes_From_Source
(Act_Decl_Id
, True);
2912 Set_Is_Generic_Instance
(Act_Decl_Id
, False);
2913 Set_Defining_Identifier
(N
, Act_Decl_Id
);
2917 when Instantiation_Error
=>
2918 if Parent_Installed
then
2921 end Analyze_Package_Instantiation
;
2923 --------------------------
2924 -- Inline_Instance_Body --
2925 --------------------------
2927 procedure Inline_Instance_Body
2929 Gen_Unit
: Entity_Id
;
2933 Gen_Comp
: constant Entity_Id
:=
2934 Cunit_Entity
(Get_Source_Unit
(Gen_Unit
));
2935 Curr_Comp
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
2936 Curr_Scope
: Entity_Id
:= Empty
;
2937 Curr_Unit
: constant Entity_Id
:=
2938 Cunit_Entity
(Current_Sem_Unit
);
2939 Removed
: Boolean := False;
2940 Num_Scopes
: Int
:= 0;
2941 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2942 Instances
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2943 Inner_Scopes
: array (1 .. Scope_Stack
.Last
) of Entity_Id
;
2944 Num_Inner
: Int
:= 0;
2945 N_Instances
: Int
:= 0;
2949 -- Case of generic unit defined in another unit. We must remove
2950 -- the complete context of the current unit to install that of
2953 if Gen_Comp
/= Cunit_Entity
(Current_Sem_Unit
) then
2957 and then S
/= Standard_Standard
2959 Num_Scopes
:= Num_Scopes
+ 1;
2961 Use_Clauses
(Num_Scopes
) :=
2963 (Scope_Stack
.Last
- Num_Scopes
+ 1).
2965 End_Use_Clauses
(Use_Clauses
(Num_Scopes
));
2967 exit when Is_Generic_Instance
(S
)
2968 and then (In_Package_Body
(S
)
2969 or else Ekind
(S
) = E_Procedure
2970 or else Ekind
(S
) = E_Function
);
2974 Vis
:= Is_Immediately_Visible
(Gen_Comp
);
2976 -- Find and save all enclosing instances
2981 and then S
/= Standard_Standard
2983 if Is_Generic_Instance
(S
) then
2984 N_Instances
:= N_Instances
+ 1;
2985 Instances
(N_Instances
) := S
;
2987 exit when In_Package_Body
(S
);
2993 -- Remove context of current compilation unit, unless we
2994 -- are within a nested package instantiation, in which case
2995 -- the context has been removed previously.
2997 -- If current scope is the body of a child unit, remove context
3003 and then S
/= Standard_Standard
3005 exit when Is_Generic_Instance
(S
)
3006 and then (In_Package_Body
(S
)
3007 or else Ekind
(S
) = E_Procedure
3008 or else Ekind
(S
) = E_Function
);
3011 or else (Ekind
(Curr_Unit
) = E_Package_Body
3012 and then S
= Spec_Entity
(Curr_Unit
))
3013 or else (Ekind
(Curr_Unit
) = E_Subprogram_Body
3016 (Unit_Declaration_Node
(Curr_Unit
)))
3020 -- Remove entities in current scopes from visibility, so
3021 -- than instance body is compiled in a clean environment.
3023 Save_Scope_Stack
(Handle_Use
=> False);
3025 if Is_Child_Unit
(S
) then
3027 -- Remove child unit from stack, as well as inner scopes.
3028 -- Removing the context of a child unit removes parent
3031 while Current_Scope
/= S
loop
3032 Num_Inner
:= Num_Inner
+ 1;
3033 Inner_Scopes
(Num_Inner
) := Current_Scope
;
3038 Remove_Context
(Curr_Comp
);
3042 Remove_Context
(Curr_Comp
);
3045 if Ekind
(Curr_Unit
) = E_Package_Body
then
3046 Remove_Context
(Library_Unit
(Curr_Comp
));
3053 New_Scope
(Standard_Standard
);
3054 Scope_Stack
.Table
(Scope_Stack
.Last
).Is_Active_Stack_Base
:= True;
3055 Instantiate_Package_Body
3056 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3061 Set_Is_Immediately_Visible
(Gen_Comp
, Vis
);
3063 -- Reset Generic_Instance flag so that use clauses can be installed
3064 -- in the proper order. (See Use_One_Package for effect of enclosing
3065 -- instances on processing of use clauses).
3067 for J
in 1 .. N_Instances
loop
3068 Set_Is_Generic_Instance
(Instances
(J
), False);
3072 Install_Context
(Curr_Comp
);
3074 if Present
(Curr_Scope
)
3075 and then Is_Child_Unit
(Curr_Scope
)
3077 New_Scope
(Curr_Scope
);
3078 Set_Is_Immediately_Visible
(Curr_Scope
);
3080 -- Finally, restore inner scopes as well
3082 for J
in reverse 1 .. Num_Inner
loop
3083 New_Scope
(Inner_Scopes
(J
));
3087 Restore_Scope_Stack
(Handle_Use
=> False);
3089 if Present
(Curr_Scope
)
3091 (In_Private_Part
(Curr_Scope
)
3092 or else In_Package_Body
(Curr_Scope
))
3094 -- Install private declaration of ancestor units, which
3095 -- are currently available. Restore_Scope_Stack and
3096 -- Install_Context only install the visible part of parents.
3101 Par
:= Scope
(Curr_Scope
);
3102 while (Present
(Par
))
3103 and then Par
/= Standard_Standard
3105 Install_Private_Declarations
(Par
);
3112 -- Restore use clauses. For a child unit, use clauses in the parents
3113 -- are restored when installing the context, so only those in inner
3114 -- scopes (and those local to the child unit itself) need to be
3115 -- installed explicitly.
3117 if Is_Child_Unit
(Curr_Unit
)
3120 for J
in reverse 1 .. Num_Inner
+ 1 loop
3121 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3123 Install_Use_Clauses
(Use_Clauses
(J
));
3127 for J
in reverse 1 .. Num_Scopes
loop
3128 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:=
3130 Install_Use_Clauses
(Use_Clauses
(J
));
3134 for J
in 1 .. N_Instances
loop
3135 Set_Is_Generic_Instance
(Instances
(J
), True);
3138 -- If generic unit is in current unit, current context is correct
3141 Instantiate_Package_Body
3142 ((N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
), True);
3144 end Inline_Instance_Body
;
3146 -------------------------------------
3147 -- Analyze_Procedure_Instantiation --
3148 -------------------------------------
3150 procedure Analyze_Procedure_Instantiation
(N
: Node_Id
) is
3152 Analyze_Subprogram_Instantiation
(N
, E_Procedure
);
3153 end Analyze_Procedure_Instantiation
;
3155 --------------------------------------
3156 -- Analyze_Subprogram_Instantiation --
3157 --------------------------------------
3159 procedure Analyze_Subprogram_Instantiation
3163 Loc
: constant Source_Ptr
:= Sloc
(N
);
3164 Gen_Id
: constant Node_Id
:= Name
(N
);
3166 Anon_Id
: constant Entity_Id
:=
3167 Make_Defining_Identifier
(Sloc
(Defining_Entity
(N
)),
3168 Chars
=> New_External_Name
3169 (Chars
(Defining_Entity
(N
)), 'R'));
3171 Act_Decl_Id
: Entity_Id
;
3176 Gen_Unit
: Entity_Id
;
3178 Pack_Id
: Entity_Id
;
3179 Parent_Installed
: Boolean := False;
3180 Renaming_List
: List_Id
;
3182 procedure Analyze_Instance_And_Renamings
;
3183 -- The instance must be analyzed in a context that includes the
3184 -- mappings of generic parameters into actuals. We create a package
3185 -- declaration for this purpose, and a subprogram with an internal
3186 -- name within the package. The subprogram instance is simply an
3187 -- alias for the internal subprogram, declared in the current scope.
3189 ------------------------------------
3190 -- Analyze_Instance_And_Renamings --
3191 ------------------------------------
3193 procedure Analyze_Instance_And_Renamings
is
3194 Def_Ent
: constant Entity_Id
:= Defining_Entity
(N
);
3195 Pack_Decl
: Node_Id
;
3198 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3200 -- For the case of a compilation unit, the container package
3201 -- has the same name as the instantiation, to insure that the
3202 -- binder calls the elaboration procedure with the right name.
3203 -- Copy the entity of the instance, which may have compilation
3204 -- level flags (e.g. Is_Child_Unit) set.
3206 Pack_Id
:= New_Copy
(Def_Ent
);
3209 -- Otherwise we use the name of the instantiation concatenated
3210 -- with its source position to ensure uniqueness if there are
3211 -- several instantiations with the same name.
3214 Make_Defining_Identifier
(Loc
,
3215 Chars
=> New_External_Name
3216 (Related_Id
=> Chars
(Def_Ent
),
3218 Suffix_Index
=> Source_Offset
(Sloc
(Def_Ent
))));
3221 Pack_Decl
:= Make_Package_Declaration
(Loc
,
3222 Specification
=> Make_Package_Specification
(Loc
,
3223 Defining_Unit_Name
=> Pack_Id
,
3224 Visible_Declarations
=> Renaming_List
,
3225 End_Label
=> Empty
));
3227 Set_Instance_Spec
(N
, Pack_Decl
);
3228 Set_Is_Generic_Instance
(Pack_Id
);
3229 Set_Needs_Debug_Info
(Pack_Id
);
3231 -- Case of not a compilation unit
3233 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
3234 Mark_Rewrite_Insertion
(Pack_Decl
);
3235 Insert_Before
(N
, Pack_Decl
);
3236 Set_Has_Completion
(Pack_Id
);
3238 -- Case of an instantiation that is a compilation unit
3240 -- Place declaration on current node so context is complete
3241 -- for analysis (including nested instantiations), and for
3242 -- use in a context_clause (see Analyze_With_Clause).
3245 Set_Unit
(Parent
(N
), Pack_Decl
);
3246 Set_Parent_Spec
(Pack_Decl
, Parent_Spec
(N
));
3249 Analyze
(Pack_Decl
);
3250 Check_Formal_Packages
(Pack_Id
);
3251 Set_Is_Generic_Instance
(Pack_Id
, False);
3253 -- Body of the enclosing package is supplied when instantiating
3254 -- the subprogram body, after semantic analysis is completed.
3256 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3258 -- Remove package itself from visibility, so it does not
3259 -- conflict with subprogram.
3261 Set_Name_Entity_Id
(Chars
(Pack_Id
), Homonym
(Pack_Id
));
3263 -- Set name and scope of internal subprogram so that the
3264 -- proper external name will be generated. The proper scope
3265 -- is the scope of the wrapper package. We need to generate
3266 -- debugging information for the internal subprogram, so set
3267 -- flag accordingly.
3269 Set_Chars
(Anon_Id
, Chars
(Defining_Entity
(N
)));
3270 Set_Scope
(Anon_Id
, Scope
(Pack_Id
));
3272 -- Mark wrapper package as referenced, to avoid spurious
3273 -- warnings if the instantiation appears in various with_
3274 -- clauses of subunits of the main unit.
3276 Set_Referenced
(Pack_Id
);
3279 Set_Is_Generic_Instance
(Anon_Id
);
3280 Set_Needs_Debug_Info
(Anon_Id
);
3281 Act_Decl_Id
:= New_Copy
(Anon_Id
);
3283 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3284 Set_Chars
(Act_Decl_Id
, Chars
(Defining_Entity
(N
)));
3285 Set_Sloc
(Act_Decl_Id
, Sloc
(Defining_Entity
(N
)));
3286 Set_Comes_From_Source
(Act_Decl_Id
, True);
3288 -- The signature may involve types that are not frozen yet, but
3289 -- the subprogram will be frozen at the point the wrapper package
3290 -- is frozen, so it does not need its own freeze node. In fact, if
3291 -- one is created, it might conflict with the freezing actions from
3292 -- the wrapper package (see 7206-013).
3294 Set_Has_Delayed_Freeze
(Anon_Id
, False);
3296 -- If the instance is a child unit, mark the Id accordingly. Mark
3297 -- the anonymous entity as well, which is the real subprogram and
3298 -- which is used when the instance appears in a context clause.
3300 Set_Is_Child_Unit
(Act_Decl_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3301 Set_Is_Child_Unit
(Anon_Id
, Is_Child_Unit
(Defining_Entity
(N
)));
3302 New_Overloaded_Entity
(Act_Decl_Id
);
3303 Check_Eliminated
(Act_Decl_Id
);
3305 -- In compilation unit case, kill elaboration checks on the
3306 -- instantiation, since they are never needed -- the body is
3307 -- instantiated at the same point as the spec.
3309 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3310 Set_Suppress_Elaboration_Warnings
(Act_Decl_Id
);
3311 Set_Kill_Elaboration_Checks
(Act_Decl_Id
);
3312 Set_Is_Compilation_Unit
(Anon_Id
);
3314 Set_Cunit_Entity
(Current_Sem_Unit
, Pack_Id
);
3317 -- The instance is not a freezing point for the new subprogram
3319 Set_Is_Frozen
(Act_Decl_Id
, False);
3321 if Nkind
(Defining_Entity
(N
)) = N_Defining_Operator_Symbol
then
3322 Valid_Operator_Definition
(Act_Decl_Id
);
3325 Set_Alias
(Act_Decl_Id
, Anon_Id
);
3326 Set_Parent
(Act_Decl_Id
, Parent
(Anon_Id
));
3327 Set_Has_Completion
(Act_Decl_Id
);
3328 Set_Related_Instance
(Pack_Id
, Act_Decl_Id
);
3330 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3331 Set_Body_Required
(Parent
(N
), False);
3334 end Analyze_Instance_And_Renamings
;
3336 -- Start of processing for Analyze_Subprogram_Instantiation
3339 -- Very first thing: apply the special kludge for Text_IO processing
3340 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3341 -- Of course such an instantiation is bogus (these are packages, not
3342 -- subprograms), but we get a better error message if we do this.
3344 Text_IO_Kludge
(Gen_Id
);
3346 -- Make node global for error reporting
3348 Instantiation_Node
:= N
;
3349 Pre_Analyze_Actuals
(N
);
3352 Check_Generic_Child_Unit
(Gen_Id
, Parent_Installed
);
3353 Gen_Unit
:= Entity
(Gen_Id
);
3355 Generate_Reference
(Gen_Unit
, Gen_Id
);
3357 if Nkind
(Gen_Id
) = N_Identifier
3358 and then Chars
(Gen_Unit
) = Chars
(Defining_Entity
(N
))
3361 ("& is hidden within declaration of instance", Gen_Id
, Gen_Unit
);
3364 if Etype
(Gen_Unit
) = Any_Type
then
3369 -- Verify that it is a generic subprogram of the right kind, and that
3370 -- it does not lead to a circular instantiation.
3372 if Ekind
(Gen_Unit
) /= E_Generic_Procedure
3373 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3375 Error_Msg_N
("expect generic subprogram in instantiation", Gen_Id
);
3377 elsif In_Open_Scopes
(Gen_Unit
) then
3378 Error_Msg_NE
("instantiation of & within itself", N
, Gen_Unit
);
3380 elsif K
= E_Procedure
3381 and then Ekind
(Gen_Unit
) /= E_Generic_Procedure
3383 if Ekind
(Gen_Unit
) = E_Generic_Function
then
3385 ("cannot instantiate generic function as procedure", Gen_Id
);
3388 ("expect name of generic procedure in instantiation", Gen_Id
);
3391 elsif K
= E_Function
3392 and then Ekind
(Gen_Unit
) /= E_Generic_Function
3394 if Ekind
(Gen_Unit
) = E_Generic_Procedure
then
3396 ("cannot instantiate generic procedure as function", Gen_Id
);
3399 ("expect name of generic function in instantiation", Gen_Id
);
3403 Set_Entity
(Gen_Id
, Gen_Unit
);
3404 Set_Is_Instantiated
(Gen_Unit
);
3406 if In_Extended_Main_Source_Unit
(N
) then
3407 Generate_Reference
(Gen_Unit
, N
);
3410 -- If renaming, get original unit
3412 if Present
(Renamed_Object
(Gen_Unit
))
3413 and then (Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Procedure
3415 Ekind
(Renamed_Object
(Gen_Unit
)) = E_Generic_Function
)
3417 Gen_Unit
:= Renamed_Object
(Gen_Unit
);
3418 Set_Is_Instantiated
(Gen_Unit
);
3419 Generate_Reference
(Gen_Unit
, N
);
3422 if Contains_Instance_Of
(Gen_Unit
, Current_Scope
, Gen_Id
) then
3423 Error_Msg_Node_2
:= Current_Scope
;
3425 ("circular Instantiation: & instantiated in &!", N
, Gen_Unit
);
3426 Circularity_Detected
:= True;
3430 Gen_Decl
:= Unit_Declaration_Node
(Gen_Unit
);
3432 -- The subprogram itself cannot contain a nested instance, so
3433 -- the current parent is left empty.
3435 Set_Instance_Env
(Gen_Unit
, Empty
);
3437 -- Initialize renamings map, for error checking
3439 Generic_Renamings
.Set_Last
(0);
3440 Generic_Renamings_HTable
.Reset
;
3442 Create_Instantiation_Source
(N
, Gen_Unit
, False, S_Adjustment
);
3444 -- Copy original generic tree, to produce text for instantiation
3448 (Original_Node
(Gen_Decl
), Empty
, Instantiating
=> True);
3450 Act_Spec
:= Specification
(Act_Tree
);
3452 Analyze_Associations
3454 Generic_Formal_Declarations
(Act_Tree
),
3455 Generic_Formal_Declarations
(Gen_Decl
));
3457 -- Build the subprogram declaration, which does not appear
3458 -- in the generic template, and give it a sloc consistent
3459 -- with that of the template.
3461 Set_Defining_Unit_Name
(Act_Spec
, Anon_Id
);
3462 Set_Generic_Parent
(Act_Spec
, Gen_Unit
);
3464 Make_Subprogram_Declaration
(Sloc
(Act_Spec
),
3465 Specification
=> Act_Spec
);
3467 Set_Categorization_From_Pragmas
(Act_Decl
);
3469 if Parent_Installed
then
3473 Append
(Act_Decl
, Renaming_List
);
3474 Analyze_Instance_And_Renamings
;
3476 -- If the generic is marked Import (Intrinsic), then so is the
3477 -- instance. This indicates that there is no body to instantiate.
3478 -- If generic is marked inline, so it the instance, and the
3479 -- anonymous subprogram it renames. If inlined, or else if inlining
3480 -- is enabled for the compilation, we generate the instance body
3481 -- even if it is not within the main unit.
3483 -- Any other pragmas might also be inherited ???
3485 if Is_Intrinsic_Subprogram
(Gen_Unit
) then
3486 Set_Is_Intrinsic_Subprogram
(Anon_Id
);
3487 Set_Is_Intrinsic_Subprogram
(Act_Decl_Id
);
3489 if Chars
(Gen_Unit
) = Name_Unchecked_Conversion
then
3490 Validate_Unchecked_Conversion
(N
, Act_Decl_Id
);
3494 Generate_Definition
(Act_Decl_Id
);
3496 Set_Is_Inlined
(Act_Decl_Id
, Is_Inlined
(Gen_Unit
));
3497 Set_Is_Inlined
(Anon_Id
, Is_Inlined
(Gen_Unit
));
3499 if not Is_Intrinsic_Subprogram
(Gen_Unit
) then
3500 Check_Elab_Instantiation
(N
);
3503 Check_Hidden_Child_Unit
(N
, Gen_Unit
, Act_Decl_Id
);
3505 -- Subject to change, pending on if other pragmas are inherited ???
3507 Validate_Categorization_Dependency
(N
, Act_Decl_Id
);
3509 if not Is_Intrinsic_Subprogram
(Act_Decl_Id
) then
3511 if not Generic_Separately_Compiled
(Gen_Unit
) then
3512 Inherit_Context
(Gen_Decl
, N
);
3515 Restore_Private_Views
(Pack_Id
, False);
3517 -- If the context requires a full instantiation, mark node for
3518 -- subsequent construction of the body.
3520 if (Is_In_Main_Unit
(N
)
3521 or else Is_Inlined
(Act_Decl_Id
))
3522 and then (Operating_Mode
= Generate_Code
3523 or else (Operating_Mode
= Check_Semantics
3524 and then ASIS_Mode
))
3525 and then (Expander_Active
or else ASIS_Mode
)
3526 and then not ABE_Is_Certain
(N
)
3527 and then not Is_Eliminated
(Act_Decl_Id
)
3529 Pending_Instantiations
.Increment_Last
;
3530 Pending_Instantiations
.Table
(Pending_Instantiations
.Last
) :=
3531 (N
, Act_Decl
, Expander_Active
, Current_Sem_Unit
);
3532 Check_Forward_Instantiation
(Gen_Decl
);
3534 -- The wrapper package is always delayed, because it does
3535 -- not constitute a freeze point, but to insure that the
3536 -- freeze node is placed properly, it is created directly
3537 -- when instantiating the body (otherwise the freeze node
3538 -- might appear to early for nested instantiations).
3540 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3542 -- For ASIS purposes, indicate that the wrapper package has
3543 -- replaced the instantiation node.
3545 Rewrite
(N
, Unit
(Parent
(N
)));
3546 Set_Unit
(Parent
(N
), N
);
3549 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
3551 -- Replace instance node for library-level instantiations
3552 -- of intrinsic subprograms, for ASIS use.
3554 Rewrite
(N
, Unit
(Parent
(N
)));
3555 Set_Unit
(Parent
(N
), N
);
3558 if Parent_Installed
then
3563 Generic_Renamings
.Set_Last
(0);
3564 Generic_Renamings_HTable
.Reset
;
3568 when Instantiation_Error
=>
3569 if Parent_Installed
then
3572 end Analyze_Subprogram_Instantiation
;
3574 -------------------------
3575 -- Get_Associated_Node --
3576 -------------------------
3578 function Get_Associated_Node
(N
: Node_Id
) return Node_Id
is
3579 Assoc
: Node_Id
:= Associated_Node
(N
);
3582 if Nkind
(Assoc
) /= Nkind
(N
) then
3585 elsif Nkind
(Assoc
) = N_Aggregate
3586 or else Nkind
(Assoc
) = N_Extension_Aggregate
3591 -- If the node is part of an inner generic, it may itself have been
3592 -- remapped into a further generic copy. Associated_Node is otherwise
3593 -- used for the entity of the node, and will be of a different node
3594 -- kind, or else N has been rewritten as a literal or function call.
3596 while Present
(Associated_Node
(Assoc
))
3597 and then Nkind
(Associated_Node
(Assoc
)) = Nkind
(Assoc
)
3599 Assoc
:= Associated_Node
(Assoc
);
3602 -- Follow and additional link in case the final node was rewritten.
3603 -- This can only happen with nested generic units.
3605 if (Nkind
(Assoc
) = N_Identifier
or else Nkind
(Assoc
) in N_Op
)
3606 and then Present
(Associated_Node
(Assoc
))
3607 and then (Nkind
(Associated_Node
(Assoc
)) = N_Function_Call
3609 Nkind
(Associated_Node
(Assoc
)) = N_Explicit_Dereference
3611 Nkind
(Associated_Node
(Assoc
)) = N_Integer_Literal
3613 Nkind
(Associated_Node
(Assoc
)) = N_Real_Literal
3615 Nkind
(Associated_Node
(Assoc
)) = N_String_Literal
)
3617 Assoc
:= Associated_Node
(Assoc
);
3622 end Get_Associated_Node
;
3624 -------------------------------------------
3625 -- Build_Instance_Compilation_Unit_Nodes --
3626 -------------------------------------------
3628 procedure Build_Instance_Compilation_Unit_Nodes
3633 Decl_Cunit
: Node_Id
;
3634 Body_Cunit
: Node_Id
;
3636 New_Main
: constant Entity_Id
:= Defining_Entity
(Act_Decl
);
3637 Old_Main
: constant Entity_Id
:= Cunit_Entity
(Main_Unit
);
3640 -- A new compilation unit node is built for the instance declaration
3643 Make_Compilation_Unit
(Sloc
(N
),
3644 Context_Items
=> Empty_List
,
3647 Make_Compilation_Unit_Aux
(Sloc
(N
)));
3649 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(N
));
3650 Set_Body_Required
(Decl_Cunit
, True);
3652 -- We use the original instantiation compilation unit as the resulting
3653 -- compilation unit of the instance, since this is the main unit.
3655 Rewrite
(N
, Act_Body
);
3656 Body_Cunit
:= Parent
(N
);
3658 -- The two compilation unit nodes are linked by the Library_Unit field
3660 Set_Library_Unit
(Decl_Cunit
, Body_Cunit
);
3661 Set_Library_Unit
(Body_Cunit
, Decl_Cunit
);
3663 -- Preserve the private nature of the package if needed
3665 Set_Private_Present
(Decl_Cunit
, Private_Present
(Body_Cunit
));
3667 -- If the instance is not the main unit, its context, categorization,
3668 -- and elaboration entity are not relevant to the compilation.
3670 if Parent
(N
) /= Cunit
(Main_Unit
) then
3674 -- The context clause items on the instantiation, which are now
3675 -- attached to the body compilation unit (since the body overwrote
3676 -- the original instantiation node), semantically belong on the spec,
3677 -- so copy them there. It's harmless to leave them on the body as well.
3678 -- In fact one could argue that they belong in both places.
3680 Citem
:= First
(Context_Items
(Body_Cunit
));
3681 while Present
(Citem
) loop
3682 Append
(New_Copy
(Citem
), Context_Items
(Decl_Cunit
));
3686 -- Propagate categorization flags on packages, so that they appear
3687 -- in ali file for the spec of the unit.
3689 if Ekind
(New_Main
) = E_Package
then
3690 Set_Is_Pure
(Old_Main
, Is_Pure
(New_Main
));
3691 Set_Is_Preelaborated
(Old_Main
, Is_Preelaborated
(New_Main
));
3692 Set_Is_Remote_Types
(Old_Main
, Is_Remote_Types
(New_Main
));
3693 Set_Is_Shared_Passive
(Old_Main
, Is_Shared_Passive
(New_Main
));
3694 Set_Is_Remote_Call_Interface
3695 (Old_Main
, Is_Remote_Call_Interface
(New_Main
));
3698 -- Make entry in Units table, so that binder can generate call to
3699 -- elaboration procedure for body, if any.
3701 Make_Instance_Unit
(Body_Cunit
);
3702 Main_Unit_Entity
:= New_Main
;
3703 Set_Cunit_Entity
(Main_Unit
, Main_Unit_Entity
);
3705 -- Build elaboration entity, since the instance may certainly
3706 -- generate elaboration code requiring a flag for protection.
3708 Build_Elaboration_Entity
(Decl_Cunit
, New_Main
);
3709 end Build_Instance_Compilation_Unit_Nodes
;
3711 -----------------------------------
3712 -- Check_Formal_Package_Instance --
3713 -----------------------------------
3715 -- If the formal has specific parameters, they must match those of the
3716 -- actual. Both of them are instances, and the renaming declarations
3717 -- for their formal parameters appear in the same order in both. The
3718 -- analyzed formal has been analyzed in the context of the current
3721 procedure Check_Formal_Package_Instance
3722 (Formal_Pack
: Entity_Id
;
3723 Actual_Pack
: Entity_Id
)
3725 E1
: Entity_Id
:= First_Entity
(Actual_Pack
);
3726 E2
: Entity_Id
:= First_Entity
(Formal_Pack
);
3731 procedure Check_Mismatch
(B
: Boolean);
3732 -- Common error routine for mismatch between the parameters of
3733 -- the actual instance and those of the formal package.
3735 function Same_Instantiated_Constant
(E1
, E2
: Entity_Id
) return Boolean;
3736 -- The formal may come from a nested formal package, and the actual
3737 -- may have been constant-folded. To determine whether the two denote
3738 -- the same entity we may have to traverse several definitions to
3739 -- recover the ultimate entity that they refer to.
3741 function Same_Instantiated_Variable
(E1
, E2
: Entity_Id
) return Boolean;
3742 -- Similarly, if the formal comes from a nested formal package, the
3743 -- actual may designate the formal through multiple renamings, which
3744 -- have to be followed to determine the original variable in question.
3746 --------------------
3747 -- Check_Mismatch --
3748 --------------------
3750 procedure Check_Mismatch
(B
: Boolean) is
3754 ("actual for & in actual instance does not match formal",
3755 Parent
(Actual_Pack
), E1
);
3759 --------------------------------
3760 -- Same_Instantiated_Constant --
3761 --------------------------------
3763 function Same_Instantiated_Constant
3764 (E1
, E2
: Entity_Id
) return Boolean
3769 while Present
(Ent
) loop
3773 elsif Ekind
(Ent
) /= E_Constant
then
3776 elsif Is_Entity_Name
(Constant_Value
(Ent
)) then
3777 if Entity
(Constant_Value
(Ent
)) = E1
then
3780 Ent
:= Entity
(Constant_Value
(Ent
));
3783 -- The actual may be a constant that has been folded. Recover
3786 elsif Is_Entity_Name
(Original_Node
(Constant_Value
(Ent
))) then
3787 Ent
:= Entity
(Original_Node
(Constant_Value
(Ent
)));
3794 end Same_Instantiated_Constant
;
3796 --------------------------------
3797 -- Same_Instantiated_Variable --
3798 --------------------------------
3800 function Same_Instantiated_Variable
3801 (E1
, E2
: Entity_Id
) return Boolean
3803 function Original_Entity
(E
: Entity_Id
) return Entity_Id
;
3804 -- Follow chain of renamings to the ultimate ancestor
3806 ---------------------
3807 -- Original_Entity --
3808 ---------------------
3810 function Original_Entity
(E
: Entity_Id
) return Entity_Id
is
3815 while Nkind
(Parent
(Orig
)) = N_Object_Renaming_Declaration
3816 and then Present
(Renamed_Object
(Orig
))
3817 and then Is_Entity_Name
(Renamed_Object
(Orig
))
3819 Orig
:= Entity
(Renamed_Object
(Orig
));
3823 end Original_Entity
;
3825 -- Start of processing for Same_Instantiated_Variable
3828 return Ekind
(E1
) = Ekind
(E2
)
3829 and then Original_Entity
(E1
) = Original_Entity
(E2
);
3830 end Same_Instantiated_Variable
;
3832 -- Start of processing for Check_Formal_Package_Instance
3836 and then Present
(E2
)
3838 exit when Ekind
(E1
) = E_Package
3839 and then Renamed_Entity
(E1
) = Renamed_Entity
(Actual_Pack
);
3841 if Is_Type
(E1
) then
3843 -- Subtypes must statically match. E1 and E2 are the
3844 -- local entities that are subtypes of the actuals.
3845 -- Itypes generated for other parameters need not be checked,
3846 -- the check will be performed on the parameters themselves.
3848 if not Is_Itype
(E1
)
3849 and then not Is_Itype
(E2
)
3853 or else Etype
(E1
) /= Etype
(E2
)
3854 or else not Subtypes_Statically_Match
(E1
, E2
));
3857 elsif Ekind
(E1
) = E_Constant
then
3859 -- IN parameters must denote the same static value, or
3860 -- the same constant, or the literal null.
3862 Expr1
:= Expression
(Parent
(E1
));
3864 if Ekind
(E2
) /= E_Constant
then
3865 Check_Mismatch
(True);
3868 Expr2
:= Expression
(Parent
(E2
));
3871 if Is_Static_Expression
(Expr1
) then
3873 if not Is_Static_Expression
(Expr2
) then
3874 Check_Mismatch
(True);
3876 elsif Is_Integer_Type
(Etype
(E1
)) then
3879 V1
: constant Uint
:= Expr_Value
(Expr1
);
3880 V2
: constant Uint
:= Expr_Value
(Expr2
);
3882 Check_Mismatch
(V1
/= V2
);
3885 elsif Is_Real_Type
(Etype
(E1
)) then
3887 V1
: constant Ureal
:= Expr_Value_R
(Expr1
);
3888 V2
: constant Ureal
:= Expr_Value_R
(Expr2
);
3890 Check_Mismatch
(V1
/= V2
);
3893 elsif Is_String_Type
(Etype
(E1
))
3894 and then Nkind
(Expr1
) = N_String_Literal
3897 if Nkind
(Expr2
) /= N_String_Literal
then
3898 Check_Mismatch
(True);
3901 (not String_Equal
(Strval
(Expr1
), Strval
(Expr2
)));
3905 elsif Is_Entity_Name
(Expr1
) then
3906 if Is_Entity_Name
(Expr2
) then
3907 if Entity
(Expr1
) = Entity
(Expr2
) then
3911 (not Same_Instantiated_Constant
3912 (Entity
(Expr1
), Entity
(Expr2
)));
3915 Check_Mismatch
(True);
3918 elsif Is_Entity_Name
(Original_Node
(Expr1
))
3919 and then Is_Entity_Name
(Expr2
)
3921 Same_Instantiated_Constant
3922 (Entity
(Original_Node
(Expr1
)), Entity
(Expr2
))
3926 elsif Nkind
(Expr1
) = N_Null
then
3927 Check_Mismatch
(Nkind
(Expr1
) /= N_Null
);
3930 Check_Mismatch
(True);
3933 elsif Ekind
(E1
) = E_Variable
then
3934 Check_Mismatch
(not Same_Instantiated_Variable
(E1
, E2
));
3936 elsif Ekind
(E1
) = E_Package
then
3938 (Ekind
(E1
) /= Ekind
(E2
)
3939 or else Renamed_Object
(E1
) /= Renamed_Object
(E2
));
3941 elsif Is_Overloadable
(E1
) then
3943 -- Verify that the names of the entities match.
3944 -- What if actual is an attribute ???
3947 (Ekind
(E2
) /= Ekind
(E1
) or else (Alias
(E1
)) /= Alias
(E2
));
3950 raise Program_Error
;
3957 end Check_Formal_Package_Instance
;
3959 ---------------------------
3960 -- Check_Formal_Packages --
3961 ---------------------------
3963 procedure Check_Formal_Packages
(P_Id
: Entity_Id
) is
3965 Formal_P
: Entity_Id
;
3968 -- Iterate through the declarations in the instance, looking for
3969 -- package renaming declarations that denote instances of formal
3970 -- packages. Stop when we find the renaming of the current package
3971 -- itself. The declaration for a formal package without a box is
3972 -- followed by an internal entity that repeats the instantiation.
3974 E
:= First_Entity
(P_Id
);
3975 while Present
(E
) loop
3976 if Ekind
(E
) = E_Package
then
3977 if Renamed_Object
(E
) = P_Id
then
3980 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
3983 elsif not Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
3984 Formal_P
:= Next_Entity
(E
);
3985 Check_Formal_Package_Instance
(Formal_P
, E
);
3991 end Check_Formal_Packages
;
3993 ---------------------------------
3994 -- Check_Forward_Instantiation --
3995 ---------------------------------
3997 procedure Check_Forward_Instantiation
(Decl
: Node_Id
) is
3999 Gen_Comp
: Entity_Id
:= Cunit_Entity
(Get_Source_Unit
(Decl
));
4002 -- The instantiation appears before the generic body if we are in the
4003 -- scope of the unit containing the generic, either in its spec or in
4004 -- the package body. and before the generic body.
4006 if Ekind
(Gen_Comp
) = E_Package_Body
then
4007 Gen_Comp
:= Spec_Entity
(Gen_Comp
);
4010 if In_Open_Scopes
(Gen_Comp
)
4011 and then No
(Corresponding_Body
(Decl
))
4016 and then not Is_Compilation_Unit
(S
)
4017 and then not Is_Child_Unit
(S
)
4019 if Ekind
(S
) = E_Package
then
4020 Set_Has_Forward_Instantiation
(S
);
4026 end Check_Forward_Instantiation
;
4028 ---------------------------
4029 -- Check_Generic_Actuals --
4030 ---------------------------
4032 -- The visibility of the actuals may be different between the
4033 -- point of generic instantiation and the instantiation of the body.
4035 procedure Check_Generic_Actuals
4036 (Instance
: Entity_Id
;
4037 Is_Formal_Box
: Boolean)
4042 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean;
4043 -- For a formal that is an array type, the component type is often
4044 -- a previous formal in the same unit. The privacy status of the
4045 -- component type will have been examined earlier in the traversal
4046 -- of the corresponding actuals, and this status should not be
4047 -- modified for the array type itself.
4048 -- To detect this case we have to rescan the list of formals, which
4049 -- is usually short enough to ignore the resulting inefficiency.
4051 function Denotes_Previous_Actual
(Typ
: Entity_Id
) return Boolean is
4054 Prev
:= First_Entity
(Instance
);
4055 while Present
(Prev
) loop
4057 and then Nkind
(Parent
(Prev
)) = N_Subtype_Declaration
4058 and then Is_Entity_Name
(Subtype_Indication
(Parent
(Prev
)))
4059 and then Entity
(Subtype_Indication
(Parent
(Prev
))) = Typ
4069 end Denotes_Previous_Actual
;
4071 -- Start of processing for Check_Generic_Actuals
4074 E
:= First_Entity
(Instance
);
4075 while Present
(E
) loop
4077 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
4078 and then Scope
(Etype
(E
)) /= Instance
4079 and then Is_Entity_Name
(Subtype_Indication
(Parent
(E
)))
4081 if Is_Array_Type
(E
)
4082 and then Denotes_Previous_Actual
(Component_Type
(E
))
4086 Check_Private_View
(Subtype_Indication
(Parent
(E
)));
4088 Set_Is_Generic_Actual_Type
(E
, True);
4089 Set_Is_Hidden
(E
, False);
4090 Set_Is_Potentially_Use_Visible
(E
,
4093 -- We constructed the generic actual type as a subtype of
4094 -- the supplied type. This means that it normally would not
4095 -- inherit subtype specific attributes of the actual, which
4096 -- is wrong for the generic case.
4098 Astype
:= Ancestor_Subtype
(E
);
4102 -- can happen when E is an itype that is the full view of
4103 -- a private type completed, e.g. with a constrained array.
4105 Astype
:= Base_Type
(E
);
4108 Set_Size_Info
(E
, (Astype
));
4109 Set_RM_Size
(E
, RM_Size
(Astype
));
4110 Set_First_Rep_Item
(E
, First_Rep_Item
(Astype
));
4112 if Is_Discrete_Or_Fixed_Point_Type
(E
) then
4113 Set_RM_Size
(E
, RM_Size
(Astype
));
4115 -- In nested instances, the base type of an access actual
4116 -- may itself be private, and need to be exchanged.
4118 elsif Is_Access_Type
(E
)
4119 and then Is_Private_Type
(Etype
(E
))
4122 (New_Occurrence_Of
(Etype
(E
), Sloc
(Instance
)));
4125 elsif Ekind
(E
) = E_Package
then
4127 -- If this is the renaming for the current instance, we're done.
4128 -- Otherwise it is a formal package. If the corresponding formal
4129 -- was declared with a box, the (instantiations of the) generic
4130 -- formal part are also visible. Otherwise, ignore the entity
4131 -- created to validate the actuals.
4133 if Renamed_Object
(E
) = Instance
then
4136 elsif Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
then
4139 -- The visibility of a formal of an enclosing generic is already
4142 elsif Denotes_Formal_Package
(E
) then
4145 elsif Present
(Associated_Formal_Package
(E
)) then
4146 if Box_Present
(Parent
(Associated_Formal_Package
(E
))) then
4147 Check_Generic_Actuals
(Renamed_Object
(E
), True);
4150 Set_Is_Hidden
(E
, False);
4153 -- If this is a subprogram instance (in a wrapper package) the
4154 -- actual is fully visible.
4156 elsif Is_Wrapper_Package
(Instance
) then
4157 Set_Is_Hidden
(E
, False);
4160 Set_Is_Hidden
(E
, not Is_Formal_Box
);
4165 end Check_Generic_Actuals
;
4167 ------------------------------
4168 -- Check_Generic_Child_Unit --
4169 ------------------------------
4171 procedure Check_Generic_Child_Unit
4173 Parent_Installed
: in out Boolean)
4175 Loc
: constant Source_Ptr
:= Sloc
(Gen_Id
);
4176 Gen_Par
: Entity_Id
:= Empty
;
4177 Inst_Par
: Entity_Id
;
4181 function Find_Generic_Child
4183 Id
: Node_Id
) return Entity_Id
;
4184 -- Search generic parent for possible child unit with the given name
4186 function In_Enclosing_Instance
return Boolean;
4187 -- Within an instance of the parent, the child unit may be denoted
4188 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4189 -- scopes to locate a possible parent instantiation.
4191 ------------------------
4192 -- Find_Generic_Child --
4193 ------------------------
4195 function Find_Generic_Child
4197 Id
: Node_Id
) return Entity_Id
4202 -- If entity of name is already set, instance has already been
4203 -- resolved, e.g. in an enclosing instantiation.
4205 if Present
(Entity
(Id
)) then
4206 if Scope
(Entity
(Id
)) = Scop
then
4213 E
:= First_Entity
(Scop
);
4214 while Present
(E
) loop
4215 if Chars
(E
) = Chars
(Id
)
4216 and then Is_Child_Unit
(E
)
4218 if Is_Child_Unit
(E
)
4219 and then not Is_Visible_Child_Unit
(E
)
4222 ("generic child unit& is not visible", Gen_Id
, E
);
4234 end Find_Generic_Child
;
4236 ---------------------------
4237 -- In_Enclosing_Instance --
4238 ---------------------------
4240 function In_Enclosing_Instance
return Boolean is
4241 Enclosing_Instance
: Node_Id
;
4242 Instance_Decl
: Node_Id
;
4245 Enclosing_Instance
:= Current_Scope
;
4247 while Present
(Enclosing_Instance
) loop
4248 Instance_Decl
:= Unit_Declaration_Node
(Enclosing_Instance
);
4250 if Ekind
(Enclosing_Instance
) = E_Package
4251 and then Is_Generic_Instance
(Enclosing_Instance
)
4253 (Generic_Parent
(Specification
(Instance_Decl
)))
4255 -- Check whether the generic we are looking for is a child
4256 -- of this instance.
4258 E
:= Find_Generic_Child
4259 (Generic_Parent
(Specification
(Instance_Decl
)), Gen_Id
);
4260 exit when Present
(E
);
4266 Enclosing_Instance
:= Scope
(Enclosing_Instance
);
4278 Make_Expanded_Name
(Loc
,
4280 Prefix
=> New_Occurrence_Of
(Enclosing_Instance
, Loc
),
4281 Selector_Name
=> New_Occurrence_Of
(E
, Loc
)));
4283 Set_Entity
(Gen_Id
, E
);
4284 Set_Etype
(Gen_Id
, Etype
(E
));
4285 Parent_Installed
:= False; -- Already in scope.
4288 end In_Enclosing_Instance
;
4290 -- Start of processing for Check_Generic_Child_Unit
4293 -- If the name of the generic is given by a selected component, it
4294 -- may be the name of a generic child unit, and the prefix is the name
4295 -- of an instance of the parent, in which case the child unit must be
4296 -- visible. If this instance is not in scope, it must be placed there
4297 -- and removed after instantiation, because what is being instantiated
4298 -- is not the original child, but the corresponding child present in
4299 -- the instance of the parent.
4301 -- If the child is instantiated within the parent, it can be given by
4302 -- a simple name. In this case the instance is already in scope, but
4303 -- the child generic must be recovered from the generic parent as well.
4305 if Nkind
(Gen_Id
) = N_Selected_Component
then
4306 S
:= Selector_Name
(Gen_Id
);
4307 Analyze
(Prefix
(Gen_Id
));
4308 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4310 if Ekind
(Inst_Par
) = E_Package
4311 and then Present
(Renamed_Object
(Inst_Par
))
4313 Inst_Par
:= Renamed_Object
(Inst_Par
);
4316 if Ekind
(Inst_Par
) = E_Package
then
4317 if Nkind
(Parent
(Inst_Par
)) = N_Package_Specification
then
4318 Gen_Par
:= Generic_Parent
(Parent
(Inst_Par
));
4320 elsif Nkind
(Parent
(Inst_Par
)) = N_Defining_Program_Unit_Name
4322 Nkind
(Parent
(Parent
(Inst_Par
))) = N_Package_Specification
4324 Gen_Par
:= Generic_Parent
(Parent
(Parent
(Inst_Par
)));
4327 elsif Ekind
(Inst_Par
) = E_Generic_Package
4328 and then Nkind
(Parent
(Gen_Id
)) = N_Formal_Package_Declaration
4330 -- A formal package may be a real child package, and not the
4331 -- implicit instance within a parent. In this case the child is
4332 -- not visible and has to be retrieved explicitly as well.
4334 Gen_Par
:= Inst_Par
;
4337 if Present
(Gen_Par
) then
4339 -- The prefix denotes an instantiation. The entity itself
4340 -- may be a nested generic, or a child unit.
4342 E
:= Find_Generic_Child
(Gen_Par
, S
);
4345 Change_Selected_Component_To_Expanded_Name
(Gen_Id
);
4346 Set_Entity
(Gen_Id
, E
);
4347 Set_Etype
(Gen_Id
, Etype
(E
));
4349 Set_Etype
(S
, Etype
(E
));
4351 -- Indicate that this is a reference to the parent
4353 if In_Extended_Main_Source_Unit
(Gen_Id
) then
4354 Set_Is_Instantiated
(Inst_Par
);
4357 -- A common mistake is to replicate the naming scheme of
4358 -- a hierarchy by instantiating a generic child directly,
4359 -- rather than the implicit child in a parent instance:
4361 -- generic .. package Gpar is ..
4362 -- generic .. package Gpar.Child is ..
4363 -- package Par is new Gpar ();
4366 -- package Par.Child is new Gpar.Child ();
4367 -- rather than Par.Child
4369 -- In this case the instantiation is within Par, which is
4370 -- an instance, but Gpar does not denote Par because we are
4371 -- not IN the instance of Gpar, so this is illegal. The test
4372 -- below recognizes this particular case.
4374 if Is_Child_Unit
(E
)
4375 and then not Comes_From_Source
(Entity
(Prefix
(Gen_Id
)))
4376 and then (not In_Instance
4377 or else Nkind
(Parent
(Parent
(Gen_Id
))) =
4381 ("prefix of generic child unit must be instance of parent",
4385 if not In_Open_Scopes
(Inst_Par
)
4386 and then Nkind
(Parent
(Gen_Id
)) not in
4387 N_Generic_Renaming_Declaration
4389 Install_Parent
(Inst_Par
);
4390 Parent_Installed
:= True;
4394 -- If the generic parent does not contain an entity that
4395 -- corresponds to the selector, the instance doesn't either.
4396 -- Analyzing the node will yield the appropriate error message.
4397 -- If the entity is not a child unit, then it is an inner
4398 -- generic in the parent.
4406 if Is_Child_Unit
(Entity
(Gen_Id
))
4408 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4409 and then not In_Open_Scopes
(Inst_Par
)
4411 Install_Parent
(Inst_Par
);
4412 Parent_Installed
:= True;
4416 elsif Nkind
(Gen_Id
) = N_Expanded_Name
then
4418 -- Entity already present, analyze prefix, whose meaning may be
4419 -- an instance in the current context. If it is an instance of
4420 -- a relative within another, the proper parent may still have
4421 -- to be installed, if they are not of the same generation.
4423 Analyze
(Prefix
(Gen_Id
));
4424 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4426 if In_Enclosing_Instance
then
4429 elsif Present
(Entity
(Gen_Id
))
4430 and then Is_Child_Unit
(Entity
(Gen_Id
))
4431 and then not In_Open_Scopes
(Inst_Par
)
4433 Install_Parent
(Inst_Par
);
4434 Parent_Installed
:= True;
4437 elsif In_Enclosing_Instance
then
4439 -- The child unit is found in some enclosing scope
4446 -- If this is the renaming of the implicit child in a parent
4447 -- instance, recover the parent name and install it.
4449 if Is_Entity_Name
(Gen_Id
) then
4450 E
:= Entity
(Gen_Id
);
4452 if Is_Generic_Unit
(E
)
4453 and then Nkind
(Parent
(E
)) in N_Generic_Renaming_Declaration
4454 and then Is_Child_Unit
(Renamed_Object
(E
))
4455 and then Is_Generic_Unit
(Scope
(Renamed_Object
(E
)))
4456 and then Nkind
(Name
(Parent
(E
))) = N_Expanded_Name
4459 New_Copy_Tree
(Name
(Parent
(E
))));
4460 Inst_Par
:= Entity
(Prefix
(Gen_Id
));
4462 if not In_Open_Scopes
(Inst_Par
) then
4463 Install_Parent
(Inst_Par
);
4464 Parent_Installed
:= True;
4467 -- If it is a child unit of a non-generic parent, it may be
4468 -- use-visible and given by a direct name. Install parent as
4471 elsif Is_Generic_Unit
(E
)
4472 and then Is_Child_Unit
(E
)
4474 Nkind
(Parent
(Gen_Id
)) not in N_Generic_Renaming_Declaration
4475 and then not Is_Generic_Unit
(Scope
(E
))
4477 if not In_Open_Scopes
(Scope
(E
)) then
4478 Install_Parent
(Scope
(E
));
4479 Parent_Installed
:= True;
4484 end Check_Generic_Child_Unit
;
4486 -----------------------------
4487 -- Check_Hidden_Child_Unit --
4488 -----------------------------
4490 procedure Check_Hidden_Child_Unit
4492 Gen_Unit
: Entity_Id
;
4493 Act_Decl_Id
: Entity_Id
)
4495 Gen_Id
: constant Node_Id
:= Name
(N
);
4498 if Is_Child_Unit
(Gen_Unit
)
4499 and then Is_Child_Unit
(Act_Decl_Id
)
4500 and then Nkind
(Gen_Id
) = N_Expanded_Name
4501 and then Entity
(Prefix
(Gen_Id
)) = Scope
(Act_Decl_Id
)
4502 and then Chars
(Gen_Unit
) = Chars
(Act_Decl_Id
)
4504 Error_Msg_Node_2
:= Scope
(Act_Decl_Id
);
4506 ("generic unit & is implicitly declared in &",
4507 Defining_Unit_Name
(N
), Gen_Unit
);
4508 Error_Msg_N
("\instance must have different name",
4509 Defining_Unit_Name
(N
));
4511 end Check_Hidden_Child_Unit
;
4513 ------------------------
4514 -- Check_Private_View --
4515 ------------------------
4517 procedure Check_Private_View
(N
: Node_Id
) is
4518 T
: constant Entity_Id
:= Etype
(N
);
4522 -- Exchange views if the type was not private in the generic but is
4523 -- private at the point of instantiation. Do not exchange views if
4524 -- the scope of the type is in scope. This can happen if both generic
4525 -- and instance are sibling units, or if type is defined in a parent.
4526 -- In this case the visibility of the type will be correct for all
4530 BT
:= Base_Type
(T
);
4532 if Is_Private_Type
(T
)
4533 and then not Has_Private_View
(N
)
4534 and then Present
(Full_View
(T
))
4535 and then not In_Open_Scopes
(Scope
(T
))
4537 -- In the generic, the full type was visible. Save the
4538 -- private entity, for subsequent exchange.
4542 elsif Has_Private_View
(N
)
4543 and then not Is_Private_Type
(T
)
4544 and then not Has_Been_Exchanged
(T
)
4545 and then Etype
(Get_Associated_Node
(N
)) /= T
4547 -- Only the private declaration was visible in the generic. If
4548 -- the type appears in a subtype declaration, the subtype in the
4549 -- instance must have a view compatible with that of its parent,
4550 -- which must be exchanged (see corresponding code in Restore_
4551 -- Private_Views). Otherwise, if the type is defined in a parent
4552 -- unit, leave full visibility within instance, which is safe.
4554 if In_Open_Scopes
(Scope
(Base_Type
(T
)))
4555 and then not Is_Private_Type
(Base_Type
(T
))
4556 and then Comes_From_Source
(Base_Type
(T
))
4560 elsif Nkind
(Parent
(N
)) = N_Subtype_Declaration
4561 or else not In_Private_Part
(Scope
(Base_Type
(T
)))
4563 Append_Elmt
(T
, Exchanged_Views
);
4564 Exchange_Declarations
(Etype
(Get_Associated_Node
(N
)));
4567 -- For composite types with inconsistent representation
4568 -- exchange component types accordingly.
4570 elsif Is_Access_Type
(T
)
4571 and then Is_Private_Type
(Designated_Type
(T
))
4572 and then not Has_Private_View
(N
)
4573 and then Present
(Full_View
(Designated_Type
(T
)))
4575 Switch_View
(Designated_Type
(T
));
4577 elsif Is_Array_Type
(T
)
4578 and then Is_Private_Type
(Component_Type
(T
))
4579 and then not Has_Private_View
(N
)
4580 and then Present
(Full_View
(Component_Type
(T
)))
4582 Switch_View
(Component_Type
(T
));
4584 elsif Is_Private_Type
(T
)
4585 and then Present
(Full_View
(T
))
4586 and then Is_Array_Type
(Full_View
(T
))
4587 and then Is_Private_Type
(Component_Type
(Full_View
(T
)))
4591 -- Finally, a non-private subtype may have a private base type,
4592 -- which must be exchanged for consistency. This can happen when
4593 -- instantiating a package body, when the scope stack is empty
4594 -- but in fact the subtype and the base type are declared in an
4597 elsif not Is_Private_Type
(T
)
4598 and then not Has_Private_View
(N
)
4599 and then Is_Private_Type
(Base_Type
(T
))
4600 and then Present
(Full_View
(BT
))
4601 and then not Is_Generic_Type
(BT
)
4602 and then not In_Open_Scopes
(BT
)
4604 Append_Elmt
(Full_View
(BT
), Exchanged_Views
);
4605 Exchange_Declarations
(BT
);
4608 end Check_Private_View
;
4610 --------------------------
4611 -- Contains_Instance_Of --
4612 --------------------------
4614 function Contains_Instance_Of
4617 N
: Node_Id
) return Boolean
4625 -- Verify that there are no circular instantiations. We check whether
4626 -- the unit contains an instance of the current scope or some enclosing
4627 -- scope (in case one of the instances appears in a subunit). Longer
4628 -- circularities involving subunits might seem too pathological to
4629 -- consider, but they were not too pathological for the authors of
4630 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4631 -- enclosing generic scopes as containing an instance.
4634 -- Within a generic subprogram body, the scope is not generic, to
4635 -- allow for recursive subprograms. Use the declaration to determine
4636 -- whether this is a generic unit.
4638 if Ekind
(Scop
) = E_Generic_Package
4639 or else (Is_Subprogram
(Scop
)
4640 and then Nkind
(Unit_Declaration_Node
(Scop
)) =
4641 N_Generic_Subprogram_Declaration
)
4643 Elmt
:= First_Elmt
(Inner_Instances
(Inner
));
4645 while Present
(Elmt
) loop
4646 if Node
(Elmt
) = Scop
then
4647 Error_Msg_Node_2
:= Inner
;
4649 ("circular Instantiation: & instantiated within &!",
4653 elsif Node
(Elmt
) = Inner
then
4656 elsif Contains_Instance_Of
(Node
(Elmt
), Scop
, N
) then
4657 Error_Msg_Node_2
:= Inner
;
4659 ("circular Instantiation: & instantiated within &!",
4667 -- Indicate that Inner is being instantiated within Scop
4669 Append_Elmt
(Inner
, Inner_Instances
(Scop
));
4672 if Scop
= Standard_Standard
then
4675 Scop
:= Scope
(Scop
);
4680 end Contains_Instance_Of
;
4682 -----------------------
4683 -- Copy_Generic_Node --
4684 -----------------------
4686 function Copy_Generic_Node
4688 Parent_Id
: Node_Id
;
4689 Instantiating
: Boolean) return Node_Id
4694 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
;
4695 -- Check the given value of one of the Fields referenced by the
4696 -- current node to determine whether to copy it recursively. The
4697 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4698 -- value (Sloc, Uint, Char) in which case it need not be copied.
4700 procedure Copy_Descendants
;
4701 -- Common utility for various nodes
4703 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
;
4704 -- Make copy of element list
4706 function Copy_Generic_List
4708 Parent_Id
: Node_Id
) return List_Id
;
4709 -- Apply Copy_Node recursively to the members of a node list
4711 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean;
4712 -- True if an identifier is part of the defining program unit name
4713 -- of a child unit. The entity of such an identifier must be kept
4714 -- (for ASIS use) even though as the name of an enclosing generic
4715 -- it would otherwise not be preserved in the generic tree.
4717 ----------------------
4718 -- Copy_Descendants --
4719 ----------------------
4721 procedure Copy_Descendants
is
4723 use Atree
.Unchecked_Access
;
4724 -- This code section is part of the implementation of an untyped
4725 -- tree traversal, so it needs direct access to node fields.
4728 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
4729 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
4730 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
4731 Set_Field4
(New_N
, Copy_Generic_Descendant
(Field4
(N
)));
4732 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
4733 end Copy_Descendants
;
4735 -----------------------------
4736 -- Copy_Generic_Descendant --
4737 -----------------------------
4739 function Copy_Generic_Descendant
(D
: Union_Id
) return Union_Id
is
4741 if D
= Union_Id
(Empty
) then
4744 elsif D
in Node_Range
then
4746 (Copy_Generic_Node
(Node_Id
(D
), New_N
, Instantiating
));
4748 elsif D
in List_Range
then
4749 return Union_Id
(Copy_Generic_List
(List_Id
(D
), New_N
));
4751 elsif D
in Elist_Range
then
4752 return Union_Id
(Copy_Generic_Elist
(Elist_Id
(D
)));
4754 -- Nothing else is copyable (e.g. Uint values), return as is
4759 end Copy_Generic_Descendant
;
4761 ------------------------
4762 -- Copy_Generic_Elist --
4763 ------------------------
4765 function Copy_Generic_Elist
(E
: Elist_Id
) return Elist_Id
is
4772 M
:= First_Elmt
(E
);
4773 while Present
(M
) loop
4775 (Copy_Generic_Node
(Node
(M
), Empty
, Instantiating
), L
);
4784 end Copy_Generic_Elist
;
4786 -----------------------
4787 -- Copy_Generic_List --
4788 -----------------------
4790 function Copy_Generic_List
4792 Parent_Id
: Node_Id
) return List_Id
4800 Set_Parent
(New_L
, Parent_Id
);
4803 while Present
(N
) loop
4804 Append
(Copy_Generic_Node
(N
, Empty
, Instantiating
), New_L
);
4813 end Copy_Generic_List
;
4815 ---------------------------
4816 -- In_Defining_Unit_Name --
4817 ---------------------------
4819 function In_Defining_Unit_Name
(Nam
: Node_Id
) return Boolean is
4821 return Present
(Parent
(Nam
))
4822 and then (Nkind
(Parent
(Nam
)) = N_Defining_Program_Unit_Name
4824 (Nkind
(Parent
(Nam
)) = N_Expanded_Name
4825 and then In_Defining_Unit_Name
(Parent
(Nam
))));
4826 end In_Defining_Unit_Name
;
4828 -- Start of processing for Copy_Generic_Node
4835 New_N
:= New_Copy
(N
);
4837 if Instantiating
then
4838 Adjust_Instantiation_Sloc
(New_N
, S_Adjustment
);
4841 if not Is_List_Member
(N
) then
4842 Set_Parent
(New_N
, Parent_Id
);
4845 -- If defining identifier, then all fields have been copied already
4847 if Nkind
(New_N
) in N_Entity
then
4850 -- Special casing for identifiers and other entity names and operators
4852 elsif Nkind
(New_N
) = N_Identifier
4853 or else Nkind
(New_N
) = N_Character_Literal
4854 or else Nkind
(New_N
) = N_Expanded_Name
4855 or else Nkind
(New_N
) = N_Operator_Symbol
4856 or else Nkind
(New_N
) in N_Op
4858 if not Instantiating
then
4860 -- Link both nodes in order to assign subsequently the
4861 -- entity of the copy to the original node, in case this
4862 -- is a global reference.
4864 Set_Associated_Node
(N
, New_N
);
4866 -- If we are within an instantiation, this is a nested generic
4867 -- that has already been analyzed at the point of definition. We
4868 -- must preserve references that were global to the enclosing
4869 -- parent at that point. Other occurrences, whether global or
4870 -- local to the current generic, must be resolved anew, so we
4871 -- reset the entity in the generic copy. A global reference has
4872 -- a smaller depth than the parent, or else the same depth in
4873 -- case both are distinct compilation units.
4875 -- It is also possible for Current_Instantiated_Parent to be
4876 -- defined, and for this not to be a nested generic, namely
4877 -- if the unit is loaded through Rtsfind. In that case, the
4878 -- entity of New_N is only a link to the associated node, and
4879 -- not a defining occurrence.
4881 -- The entities for parent units in the defining_program_unit
4882 -- of a generic child unit are established when the context of
4883 -- the unit is first analyzed, before the generic copy is made.
4884 -- They are preserved in the copy for use in ASIS queries.
4886 Ent
:= Entity
(New_N
);
4888 if No
(Current_Instantiated_Parent
.Gen_Id
) then
4890 or else Nkind
(Ent
) /= N_Defining_Identifier
4891 or else not In_Defining_Unit_Name
(N
)
4893 Set_Associated_Node
(New_N
, Empty
);
4898 not (Nkind
(Ent
) = N_Defining_Identifier
4900 Nkind
(Ent
) = N_Defining_Character_Literal
4902 Nkind
(Ent
) = N_Defining_Operator_Symbol
)
4903 or else No
(Scope
(Ent
))
4904 or else Scope
(Ent
) = Current_Instantiated_Parent
.Gen_Id
4905 or else (Scope_Depth
(Scope
(Ent
)) >
4906 Scope_Depth
(Current_Instantiated_Parent
.Gen_Id
)
4908 Get_Source_Unit
(Ent
) =
4909 Get_Source_Unit
(Current_Instantiated_Parent
.Gen_Id
))
4911 Set_Associated_Node
(New_N
, Empty
);
4914 -- Case of instantiating identifier or some other name or operator
4917 -- If the associated node is still defined, the entity in
4918 -- it is global, and must be copied to the instance.
4919 -- If this copy is being made for a body to inline, it is
4920 -- applied to an instantiated tree, and the entity is already
4921 -- present and must be also preserved.
4924 Assoc
: constant Node_Id
:= Get_Associated_Node
(N
);
4926 if Present
(Assoc
) then
4927 if Nkind
(Assoc
) = Nkind
(N
) then
4928 Set_Entity
(New_N
, Entity
(Assoc
));
4929 Check_Private_View
(N
);
4931 elsif Nkind
(Assoc
) = N_Function_Call
then
4932 Set_Entity
(New_N
, Entity
(Name
(Assoc
)));
4934 elsif (Nkind
(Assoc
) = N_Defining_Identifier
4935 or else Nkind
(Assoc
) = N_Defining_Character_Literal
4936 or else Nkind
(Assoc
) = N_Defining_Operator_Symbol
)
4937 and then Expander_Active
4939 -- Inlining case: we are copying a tree that contains
4940 -- global entities, which are preserved in the copy
4941 -- to be used for subsequent inlining.
4946 Set_Entity
(New_N
, Empty
);
4952 -- For expanded name, we must copy the Prefix and Selector_Name
4954 if Nkind
(N
) = N_Expanded_Name
then
4956 (New_N
, Copy_Generic_Node
(Prefix
(N
), New_N
, Instantiating
));
4958 Set_Selector_Name
(New_N
,
4959 Copy_Generic_Node
(Selector_Name
(N
), New_N
, Instantiating
));
4961 -- For operators, we must copy the right operand
4963 elsif Nkind
(N
) in N_Op
then
4964 Set_Right_Opnd
(New_N
,
4965 Copy_Generic_Node
(Right_Opnd
(N
), New_N
, Instantiating
));
4967 -- And for binary operators, the left operand as well
4969 if Nkind
(N
) in N_Binary_Op
then
4970 Set_Left_Opnd
(New_N
,
4971 Copy_Generic_Node
(Left_Opnd
(N
), New_N
, Instantiating
));
4975 -- Special casing for stubs
4977 elsif Nkind
(N
) in N_Body_Stub
then
4979 -- In any case, we must copy the specification or defining
4980 -- identifier as appropriate.
4982 if Nkind
(N
) = N_Subprogram_Body_Stub
then
4983 Set_Specification
(New_N
,
4984 Copy_Generic_Node
(Specification
(N
), New_N
, Instantiating
));
4987 Set_Defining_Identifier
(New_N
,
4989 (Defining_Identifier
(N
), New_N
, Instantiating
));
4992 -- If we are not instantiating, then this is where we load and
4993 -- analyze subunits, i.e. at the point where the stub occurs. A
4994 -- more permissivle system might defer this analysis to the point
4995 -- of instantiation, but this seems to complicated for now.
4997 if not Instantiating
then
4999 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
5001 Unum
: Unit_Number_Type
;
5007 (Load_Name
=> Subunit_Name
,
5012 -- If the proper body is not found, a warning message will
5013 -- be emitted when analyzing the stub, or later at the the
5014 -- point of instantiation. Here we just leave the stub as is.
5016 if Unum
= No_Unit
then
5017 Subunits_Missing
:= True;
5018 goto Subunit_Not_Found
;
5021 Subunit
:= Cunit
(Unum
);
5023 if Nkind
(Unit
(Subunit
)) /= N_Subunit
then
5024 Error_Msg_Sloc
:= Sloc
(N
);
5026 ("expected SEPARATE subunit to complete stub at#,"
5027 & " found child unit", Subunit
);
5028 goto Subunit_Not_Found
;
5031 -- We must create a generic copy of the subunit, in order
5032 -- to perform semantic analysis on it, and we must replace
5033 -- the stub in the original generic unit with the subunit,
5034 -- in order to preserve non-local references within.
5036 -- Only the proper body needs to be copied. Library_Unit and
5037 -- context clause are simply inherited by the generic copy.
5038 -- Note that the copy (which may be recursive if there are
5039 -- nested subunits) must be done first, before attaching it
5040 -- to the enclosing generic.
5044 (Proper_Body
(Unit
(Subunit
)),
5045 Empty
, Instantiating
=> False);
5047 -- Now place the original proper body in the original
5048 -- generic unit. This is a body, not a compilation unit.
5050 Rewrite
(N
, Proper_Body
(Unit
(Subunit
)));
5051 Set_Is_Compilation_Unit
(Defining_Entity
(N
), False);
5052 Set_Was_Originally_Stub
(N
);
5054 -- Finally replace the body of the subunit with its copy,
5055 -- and make this new subunit into the library unit of the
5056 -- generic copy, which does not have stubs any longer.
5058 Set_Proper_Body
(Unit
(Subunit
), New_Body
);
5059 Set_Library_Unit
(New_N
, Subunit
);
5060 Inherit_Context
(Unit
(Subunit
), N
);
5063 -- If we are instantiating, this must be an error case, since
5064 -- otherwise we would have replaced the stub node by the proper
5065 -- body that corresponds. So just ignore it in the copy (i.e.
5066 -- we have copied it, and that is good enough).
5072 <<Subunit_Not_Found
>> null;
5074 -- If the node is a compilation unit, it is the subunit of a stub,
5075 -- which has been loaded already (see code below). In this case,
5076 -- the library unit field of N points to the parent unit (which
5077 -- is a compilation unit) and need not (and cannot!) be copied.
5079 -- When the proper body of the stub is analyzed, thie library_unit
5080 -- link is used to establish the proper context (see sem_ch10).
5082 -- The other fields of a compilation unit are copied as usual
5084 elsif Nkind
(N
) = N_Compilation_Unit
then
5086 -- This code can only be executed when not instantiating, because
5087 -- in the copy made for an instantiation, the compilation unit
5088 -- node has disappeared at the point that a stub is replaced by
5091 pragma Assert
(not Instantiating
);
5093 Set_Context_Items
(New_N
,
5094 Copy_Generic_List
(Context_Items
(N
), New_N
));
5097 Copy_Generic_Node
(Unit
(N
), New_N
, False));
5099 Set_First_Inlined_Subprogram
(New_N
,
5101 (First_Inlined_Subprogram
(N
), New_N
, False));
5103 Set_Aux_Decls_Node
(New_N
,
5104 Copy_Generic_Node
(Aux_Decls_Node
(N
), New_N
, False));
5106 -- For an assignment node, the assignment is known to be semantically
5107 -- legal if we are instantiating the template. This avoids incorrect
5108 -- diagnostics in generated code.
5110 elsif Nkind
(N
) = N_Assignment_Statement
then
5112 -- Copy name and expression fields in usual manner
5115 Copy_Generic_Node
(Name
(N
), New_N
, Instantiating
));
5117 Set_Expression
(New_N
,
5118 Copy_Generic_Node
(Expression
(N
), New_N
, Instantiating
));
5120 if Instantiating
then
5121 Set_Assignment_OK
(Name
(New_N
), True);
5124 elsif Nkind
(N
) = N_Aggregate
5125 or else Nkind
(N
) = N_Extension_Aggregate
5128 if not Instantiating
then
5129 Set_Associated_Node
(N
, New_N
);
5132 if Present
(Get_Associated_Node
(N
))
5133 and then Nkind
(Get_Associated_Node
(N
)) = Nkind
(N
)
5135 -- In the generic the aggregate has some composite type. If at
5136 -- the point of instantiation the type has a private view,
5137 -- install the full view (and that of its ancestors, if any).
5140 T
: Entity_Id
:= (Etype
(Get_Associated_Node
(New_N
)));
5145 and then Is_Private_Type
(T
)
5151 and then Is_Tagged_Type
(T
)
5152 and then Is_Derived_Type
(T
)
5154 Rt
:= Root_Type
(T
);
5159 if Is_Private_Type
(T
) then
5170 -- Do not copy the associated node, which points to
5171 -- the generic copy of the aggregate.
5174 use Atree
.Unchecked_Access
;
5175 -- This code section is part of the implementation of an untyped
5176 -- tree traversal, so it needs direct access to node fields.
5179 Set_Field1
(New_N
, Copy_Generic_Descendant
(Field1
(N
)));
5180 Set_Field2
(New_N
, Copy_Generic_Descendant
(Field2
(N
)));
5181 Set_Field3
(New_N
, Copy_Generic_Descendant
(Field3
(N
)));
5182 Set_Field5
(New_N
, Copy_Generic_Descendant
(Field5
(N
)));
5185 -- Allocators do not have an identifier denoting the access type,
5186 -- so we must locate it through the expression to check whether
5187 -- the views are consistent.
5189 elsif Nkind
(N
) = N_Allocator
5190 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
5191 and then Is_Entity_Name
(Subtype_Mark
(Expression
(N
)))
5192 and then Instantiating
5195 T
: constant Node_Id
:=
5196 Get_Associated_Node
(Subtype_Mark
(Expression
(N
)));
5201 -- Retrieve the allocator node in the generic copy
5203 Acc_T
:= Etype
(Parent
(Parent
(T
)));
5205 and then Is_Private_Type
(Acc_T
)
5207 Switch_View
(Acc_T
);
5214 -- For a proper body, we must catch the case of a proper body that
5215 -- replaces a stub. This represents the point at which a separate
5216 -- compilation unit, and hence template file, may be referenced, so
5217 -- we must make a new source instantiation entry for the template
5218 -- of the subunit, and ensure that all nodes in the subunit are
5219 -- adjusted using this new source instantiation entry.
5221 elsif Nkind
(N
) in N_Proper_Body
then
5223 Save_Adjustment
: constant Sloc_Adjustment
:= S_Adjustment
;
5226 if Instantiating
and then Was_Originally_Stub
(N
) then
5227 Create_Instantiation_Source
5228 (Instantiation_Node
,
5229 Defining_Entity
(N
),
5234 -- Now copy the fields of the proper body, using the new
5235 -- adjustment factor if one was needed as per test above.
5239 -- Restore the original adjustment factor in case changed
5241 S_Adjustment
:= Save_Adjustment
;
5244 -- Don't copy Ident or Comment pragmas, since the comment belongs
5245 -- to the generic unit, not to the instantiating unit.
5247 elsif Nkind
(N
) = N_Pragma
5248 and then Instantiating
5251 Prag_Id
: constant Pragma_Id
:= Get_Pragma_Id
(Chars
(N
));
5254 if Prag_Id
= Pragma_Ident
5255 or else Prag_Id
= Pragma_Comment
5257 New_N
:= Make_Null_Statement
(Sloc
(N
));
5264 elsif Nkind
(N
) = N_Integer_Literal
5265 or else Nkind
(N
) = N_Real_Literal
5267 -- No descendant fields need traversing
5271 -- For the remaining nodes, copy recursively their descendants
5277 and then Nkind
(N
) = N_Subprogram_Body
5279 Set_Generic_Parent
(Specification
(New_N
), N
);
5284 end Copy_Generic_Node
;
5286 ----------------------------
5287 -- Denotes_Formal_Package --
5288 ----------------------------
5290 function Denotes_Formal_Package
5292 On_Exit
: Boolean := False) return Boolean
5295 Scop
: constant Entity_Id
:= Scope
(Pack
);
5302 (Instance_Envs
.Last
).Instantiated_Parent
.Act_Id
;
5304 Par
:= Current_Instantiated_Parent
.Act_Id
;
5307 if Ekind
(Scop
) = E_Generic_Package
5308 or else Nkind
(Unit_Declaration_Node
(Scop
)) =
5309 N_Generic_Subprogram_Declaration
5313 elsif Nkind
(Parent
(Pack
)) = N_Formal_Package_Declaration
then
5320 -- Check whether this package is associated with a formal
5321 -- package of the enclosing instantiation. Iterate over the
5322 -- list of renamings.
5324 E
:= First_Entity
(Par
);
5325 while Present
(E
) loop
5326 if Ekind
(E
) /= E_Package
5327 or else Nkind
(Parent
(E
)) /= N_Package_Renaming_Declaration
5330 elsif Renamed_Object
(E
) = Par
then
5333 elsif Renamed_Object
(E
) = Pack
then
5342 end Denotes_Formal_Package
;
5348 procedure End_Generic
is
5350 -- ??? More things could be factored out in this
5351 -- routine. Should probably be done at a later stage.
5353 Inside_A_Generic
:= Generic_Flags
.Table
(Generic_Flags
.Last
);
5354 Generic_Flags
.Decrement_Last
;
5356 Expander_Mode_Restore
;
5359 ----------------------
5360 -- Find_Actual_Type --
5361 ----------------------
5363 function Find_Actual_Type
5365 Gen_Scope
: Entity_Id
) return Entity_Id
5370 if not Is_Child_Unit
(Gen_Scope
) then
5371 return Get_Instance_Of
(Typ
);
5373 elsif not Is_Generic_Type
(Typ
)
5374 or else Scope
(Typ
) = Gen_Scope
5376 return Get_Instance_Of
(Typ
);
5379 T
:= Current_Entity
(Typ
);
5380 while Present
(T
) loop
5381 if In_Open_Scopes
(Scope
(T
)) then
5390 end Find_Actual_Type
;
5392 ----------------------------
5393 -- Freeze_Subprogram_Body --
5394 ----------------------------
5396 procedure Freeze_Subprogram_Body
5397 (Inst_Node
: Node_Id
;
5399 Pack_Id
: Entity_Id
)
5402 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
5403 Par
: constant Entity_Id
:= Scope
(Gen_Unit
);
5408 function Earlier
(N1
, N2
: Node_Id
) return Boolean;
5409 -- Yields True if N1 and N2 appear in the same compilation unit,
5410 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5411 -- traversal of the tree for the unit.
5413 function Enclosing_Body
(N
: Node_Id
) return Node_Id
;
5414 -- Find innermost package body that encloses the given node, and which
5415 -- is not a compilation unit. Freeze nodes for the instance, or for its
5416 -- enclosing body, may be inserted after the enclosing_body of the
5419 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
;
5420 -- Find entity for given package body, and locate or create a freeze
5423 function True_Parent
(N
: Node_Id
) return Node_Id
;
5424 -- For a subunit, return parent of corresponding stub
5430 function Earlier
(N1
, N2
: Node_Id
) return Boolean is
5436 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer);
5437 -- Find distance from given node to enclosing compilation unit
5443 procedure Find_Depth
(P
: in out Node_Id
; D
: in out Integer) is
5446 and then Nkind
(P
) /= N_Compilation_Unit
5448 P
:= True_Parent
(P
);
5453 -- Start of procesing for Earlier
5456 Find_Depth
(P1
, D1
);
5457 Find_Depth
(P2
, D2
);
5467 P1
:= True_Parent
(P1
);
5472 P2
:= True_Parent
(P2
);
5476 -- At this point P1 and P2 are at the same distance from the root.
5477 -- We examine their parents until we find a common declarative
5478 -- list, at which point we can establish their relative placement
5479 -- by comparing their ultimate slocs. If we reach the root,
5480 -- N1 and N2 do not descend from the same declarative list (e.g.
5481 -- one is nested in the declarative part and the other is in a block
5482 -- in the statement part) and the earlier one is already frozen.
5484 while not Is_List_Member
(P1
)
5485 or else not Is_List_Member
(P2
)
5486 or else List_Containing
(P1
) /= List_Containing
(P2
)
5488 P1
:= True_Parent
(P1
);
5489 P2
:= True_Parent
(P2
);
5491 if Nkind
(Parent
(P1
)) = N_Subunit
then
5492 P1
:= Corresponding_Stub
(Parent
(P1
));
5495 if Nkind
(Parent
(P2
)) = N_Subunit
then
5496 P2
:= Corresponding_Stub
(Parent
(P2
));
5505 Top_Level_Location
(Sloc
(P1
)) < Top_Level_Location
(Sloc
(P2
));
5508 --------------------
5509 -- Enclosing_Body --
5510 --------------------
5512 function Enclosing_Body
(N
: Node_Id
) return Node_Id
is
5513 P
: Node_Id
:= Parent
(N
);
5517 and then Nkind
(Parent
(P
)) /= N_Compilation_Unit
5519 if Nkind
(P
) = N_Package_Body
then
5521 if Nkind
(Parent
(P
)) = N_Subunit
then
5522 return Corresponding_Stub
(Parent
(P
));
5528 P
:= True_Parent
(P
);
5534 -------------------------
5535 -- Package_Freeze_Node --
5536 -------------------------
5538 function Package_Freeze_Node
(B
: Node_Id
) return Node_Id
is
5542 if Nkind
(B
) = N_Package_Body
then
5543 Id
:= Corresponding_Spec
(B
);
5545 else pragma Assert
(Nkind
(B
) = N_Package_Body_Stub
);
5546 Id
:= Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(B
))));
5549 Ensure_Freeze_Node
(Id
);
5550 return Freeze_Node
(Id
);
5551 end Package_Freeze_Node
;
5557 function True_Parent
(N
: Node_Id
) return Node_Id
is
5559 if Nkind
(Parent
(N
)) = N_Subunit
then
5560 return Parent
(Corresponding_Stub
(Parent
(N
)));
5566 -- Start of processing of Freeze_Subprogram_Body
5569 -- If the instance and the generic body appear within the same
5570 -- unit, and the instance preceeds the generic, the freeze node for
5571 -- the instance must appear after that of the generic. If the generic
5572 -- is nested within another instance I2, then current instance must
5573 -- be frozen after I2. In both cases, the freeze nodes are those of
5574 -- enclosing packages. Otherwise, the freeze node is placed at the end
5575 -- of the current declarative part.
5577 Enc_G
:= Enclosing_Body
(Gen_Body
);
5578 Enc_I
:= Enclosing_Body
(Inst_Node
);
5579 Ensure_Freeze_Node
(Pack_Id
);
5580 F_Node
:= Freeze_Node
(Pack_Id
);
5582 if Is_Generic_Instance
(Par
)
5583 and then Present
(Freeze_Node
(Par
))
5585 In_Same_Declarative_Part
(Freeze_Node
(Par
), Inst_Node
)
5587 if ABE_Is_Certain
(Get_Package_Instantiation_Node
(Par
)) then
5589 -- The parent was a premature instantiation. Insert freeze
5590 -- node at the end the current declarative part.
5592 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5595 Insert_After
(Freeze_Node
(Par
), F_Node
);
5598 -- The body enclosing the instance should be frozen after the body
5599 -- that includes the generic, because the body of the instance may
5600 -- make references to entities therein. If the two are not in the
5601 -- same declarative part, or if the one enclosing the instance is
5602 -- frozen already, freeze the instance at the end of the current
5603 -- declarative part.
5605 elsif Is_Generic_Instance
(Par
)
5606 and then Present
(Freeze_Node
(Par
))
5607 and then Present
(Enc_I
)
5609 if In_Same_Declarative_Part
(Freeze_Node
(Par
), Enc_I
)
5611 (Nkind
(Enc_I
) = N_Package_Body
5613 In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(Enc_I
)))
5615 -- The enclosing package may contain several instances. Rather
5616 -- than computing the earliest point at which to insert its
5617 -- freeze node, we place it at the end of the declarative part
5618 -- of the parent of the generic.
5620 Insert_After_Last_Decl
5621 (Freeze_Node
(Par
), Package_Freeze_Node
(Enc_I
));
5624 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5626 elsif Present
(Enc_G
)
5627 and then Present
(Enc_I
)
5628 and then Enc_G
/= Enc_I
5629 and then Earlier
(Inst_Node
, Gen_Body
)
5631 if Nkind
(Enc_G
) = N_Package_Body
then
5632 E_G_Id
:= Corresponding_Spec
(Enc_G
);
5633 else pragma Assert
(Nkind
(Enc_G
) = N_Package_Body_Stub
);
5635 Corresponding_Spec
(Proper_Body
(Unit
(Library_Unit
(Enc_G
))));
5638 -- Freeze package that encloses instance, and place node after
5639 -- package that encloses generic. If enclosing package is already
5640 -- frozen we have to assume it is at the proper place. This may
5641 -- be a potential ABE that requires dynamic checking.
5643 Insert_After_Last_Decl
(Enc_G
, Package_Freeze_Node
(Enc_I
));
5645 -- Freeze enclosing subunit before instance
5647 Ensure_Freeze_Node
(E_G_Id
);
5649 if not Is_List_Member
(Freeze_Node
(E_G_Id
)) then
5650 Insert_After
(Enc_G
, Freeze_Node
(E_G_Id
));
5653 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5656 -- If none of the above, insert freeze node at the end of the
5657 -- current declarative part.
5659 Insert_After_Last_Decl
(Inst_Node
, F_Node
);
5661 end Freeze_Subprogram_Body
;
5667 function Get_Gen_Id
(E
: Assoc_Ptr
) return Entity_Id
is
5669 return Generic_Renamings
.Table
(E
).Gen_Id
;
5672 ---------------------
5673 -- Get_Instance_Of --
5674 ---------------------
5676 function Get_Instance_Of
(A
: Entity_Id
) return Entity_Id
is
5677 Res
: constant Assoc_Ptr
:= Generic_Renamings_HTable
.Get
(A
);
5680 if Res
/= Assoc_Null
then
5681 return Generic_Renamings
.Table
(Res
).Act_Id
;
5683 -- On exit, entity is not instantiated: not a generic parameter,
5684 -- or else parameter of an inner generic unit.
5688 end Get_Instance_Of
;
5690 ------------------------------------
5691 -- Get_Package_Instantiation_Node --
5692 ------------------------------------
5694 function Get_Package_Instantiation_Node
(A
: Entity_Id
) return Node_Id
is
5695 Decl
: Node_Id
:= Unit_Declaration_Node
(A
);
5699 -- If the instantiation is a compilation unit that does not need a
5700 -- body then the instantiation node has been rewritten as a package
5701 -- declaration for the instance, and we return the original node.
5703 -- If it is a compilation unit and the instance node has not been
5704 -- rewritten, then it is still the unit of the compilation. Finally,
5705 -- if a body is present, this is a parent of the main unit whose body
5706 -- has been compiled for inlining purposes, and the instantiation node
5707 -- has been rewritten with the instance body.
5709 -- Otherwise the instantiation node appears after the declaration.
5710 -- If the entity is a formal package, the declaration may have been
5711 -- rewritten as a generic declaration (in the case of a formal with a
5712 -- box) or left as a formal package declaration if it has actuals, and
5713 -- is found with a forward search.
5715 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
5716 if Nkind
(Decl
) = N_Package_Declaration
5717 and then Present
(Corresponding_Body
(Decl
))
5719 Decl
:= Unit_Declaration_Node
(Corresponding_Body
(Decl
));
5722 if Nkind
(Original_Node
(Decl
)) = N_Package_Instantiation
then
5723 return Original_Node
(Decl
);
5725 return Unit
(Parent
(Decl
));
5728 elsif Nkind
(Decl
) = N_Generic_Package_Declaration
5729 and then Nkind
(Original_Node
(Decl
)) = N_Formal_Package_Declaration
5731 return Original_Node
(Decl
);
5734 Inst
:= Next
(Decl
);
5735 while Nkind
(Inst
) /= N_Package_Instantiation
5736 and then Nkind
(Inst
) /= N_Formal_Package_Declaration
5743 end Get_Package_Instantiation_Node
;
5745 ------------------------
5746 -- Has_Been_Exchanged --
5747 ------------------------
5749 function Has_Been_Exchanged
(E
: Entity_Id
) return Boolean is
5750 Next
: Elmt_Id
:= First_Elmt
(Exchanged_Views
);
5753 while Present
(Next
) loop
5754 if Full_View
(Node
(Next
)) = E
then
5762 end Has_Been_Exchanged
;
5768 function Hash
(F
: Entity_Id
) return HTable_Range
is
5770 return HTable_Range
(F
mod HTable_Size
);
5773 ------------------------
5774 -- Hide_Current_Scope --
5775 ------------------------
5777 procedure Hide_Current_Scope
is
5778 C
: constant Entity_Id
:= Current_Scope
;
5782 Set_Is_Hidden_Open_Scope
(C
);
5783 E
:= First_Entity
(C
);
5785 while Present
(E
) loop
5786 if Is_Immediately_Visible
(E
) then
5787 Set_Is_Immediately_Visible
(E
, False);
5788 Append_Elmt
(E
, Hidden_Entities
);
5794 -- Make the scope name invisible as well. This is necessary, but
5795 -- might conflict with calls to Rtsfind later on, in case the scope
5796 -- is a predefined one. There is no clean solution to this problem, so
5797 -- for now we depend on the user not redefining Standard itself in one
5798 -- of the parent units.
5800 if Is_Immediately_Visible
(C
)
5801 and then C
/= Standard_Standard
5803 Set_Is_Immediately_Visible
(C
, False);
5804 Append_Elmt
(C
, Hidden_Entities
);
5807 end Hide_Current_Scope
;
5813 procedure Init_Env
is
5814 Saved
: Instance_Env
;
5817 Saved
.Ada_Version
:= Ada_Version
;
5818 Saved
.Instantiated_Parent
:= Current_Instantiated_Parent
;
5819 Saved
.Exchanged_Views
:= Exchanged_Views
;
5820 Saved
.Hidden_Entities
:= Hidden_Entities
;
5821 Saved
.Current_Sem_Unit
:= Current_Sem_Unit
;
5822 Saved
.Parent_Unit_Visible
:= Parent_Unit_Visible
;
5823 Instance_Envs
.Increment_Last
;
5824 Instance_Envs
.Table
(Instance_Envs
.Last
) := Saved
;
5826 Exchanged_Views
:= New_Elmt_List
;
5827 Hidden_Entities
:= New_Elmt_List
;
5829 -- Make dummy entry for Instantiated parent. If generic unit is
5830 -- legal, this is set properly in Set_Instance_Env.
5832 Current_Instantiated_Parent
:=
5833 (Current_Scope
, Current_Scope
, Assoc_Null
);
5836 ------------------------------
5837 -- In_Same_Declarative_Part --
5838 ------------------------------
5840 function In_Same_Declarative_Part
5842 Inst
: Node_Id
) return Boolean
5844 Decls
: constant Node_Id
:= Parent
(F_Node
);
5845 Nod
: Node_Id
:= Parent
(Inst
);
5848 while Present
(Nod
) loop
5852 elsif Nkind
(Nod
) = N_Subprogram_Body
5853 or else Nkind
(Nod
) = N_Package_Body
5854 or else Nkind
(Nod
) = N_Task_Body
5855 or else Nkind
(Nod
) = N_Protected_Body
5856 or else Nkind
(Nod
) = N_Block_Statement
5860 elsif Nkind
(Nod
) = N_Subunit
then
5861 Nod
:= Corresponding_Stub
(Nod
);
5863 elsif Nkind
(Nod
) = N_Compilation_Unit
then
5866 Nod
:= Parent
(Nod
);
5871 end In_Same_Declarative_Part
;
5873 ---------------------
5874 -- In_Main_Context --
5875 ---------------------
5877 function In_Main_Context
(E
: Entity_Id
) return Boolean is
5883 if not Is_Compilation_Unit
(E
)
5884 or else Ekind
(E
) /= E_Package
5885 or else In_Private_Part
(E
)
5890 Context
:= Context_Items
(Cunit
(Main_Unit
));
5892 Clause
:= First
(Context
);
5893 while Present
(Clause
) loop
5894 if Nkind
(Clause
) = N_With_Clause
then
5895 Nam
:= Name
(Clause
);
5897 -- If the current scope is part of the context of the main unit,
5898 -- analysis of the corresponding with_clause is not complete, and
5899 -- the entity is not set. We use the Chars field directly, which
5900 -- might produce false positives in rare cases, but guarantees
5901 -- that we produce all the instance bodies we will need.
5903 if (Nkind
(Nam
) = N_Identifier
5904 and then Chars
(Nam
) = Chars
(E
))
5905 or else (Nkind
(Nam
) = N_Selected_Component
5906 and then Chars
(Selector_Name
(Nam
)) = Chars
(E
))
5916 end In_Main_Context
;
5918 ---------------------
5919 -- Inherit_Context --
5920 ---------------------
5922 procedure Inherit_Context
(Gen_Decl
: Node_Id
; Inst
: Node_Id
) is
5923 Current_Context
: List_Id
;
5924 Current_Unit
: Node_Id
;
5929 if Nkind
(Parent
(Gen_Decl
)) = N_Compilation_Unit
then
5931 -- The inherited context is attached to the enclosing compilation
5932 -- unit. This is either the main unit, or the declaration for the
5933 -- main unit (in case the instantation appears within the package
5934 -- declaration and the main unit is its body).
5936 Current_Unit
:= Parent
(Inst
);
5937 while Present
(Current_Unit
)
5938 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
5940 Current_Unit
:= Parent
(Current_Unit
);
5943 Current_Context
:= Context_Items
(Current_Unit
);
5945 Item
:= First
(Context_Items
(Parent
(Gen_Decl
)));
5946 while Present
(Item
) loop
5947 if Nkind
(Item
) = N_With_Clause
then
5948 New_I
:= New_Copy
(Item
);
5949 Set_Implicit_With
(New_I
, True);
5950 Append
(New_I
, Current_Context
);
5956 end Inherit_Context
;
5962 procedure Initialize
is
5964 Generic_Renamings
.Init
;
5967 Generic_Renamings_HTable
.Reset
;
5968 Circularity_Detected
:= False;
5969 Exchanged_Views
:= No_Elist
;
5970 Hidden_Entities
:= No_Elist
;
5973 ----------------------------
5974 -- Insert_After_Last_Decl --
5975 ----------------------------
5977 procedure Insert_After_Last_Decl
(N
: Node_Id
; F_Node
: Node_Id
) is
5978 L
: List_Id
:= List_Containing
(N
);
5979 P
: constant Node_Id
:= Parent
(L
);
5982 if not Is_List_Member
(F_Node
) then
5983 if Nkind
(P
) = N_Package_Specification
5984 and then L
= Visible_Declarations
(P
)
5985 and then Present
(Private_Declarations
(P
))
5986 and then not Is_Empty_List
(Private_Declarations
(P
))
5988 L
:= Private_Declarations
(P
);
5991 Insert_After
(Last
(L
), F_Node
);
5993 end Insert_After_Last_Decl
;
5999 procedure Install_Body
6000 (Act_Body
: Node_Id
;
6005 Act_Id
: constant Entity_Id
:= Corresponding_Spec
(Act_Body
);
6006 Act_Unit
: constant Node_Id
:= Unit
(Cunit
(Get_Source_Unit
(N
)));
6007 Gen_Id
: constant Entity_Id
:= Corresponding_Spec
(Gen_Body
);
6008 Par
: constant Entity_Id
:= Scope
(Gen_Id
);
6009 Gen_Unit
: constant Node_Id
:=
6010 Unit
(Cunit
(Get_Source_Unit
(Gen_Decl
)));
6011 Orig_Body
: Node_Id
:= Gen_Body
;
6013 Body_Unit
: Node_Id
;
6015 Must_Delay
: Boolean;
6017 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
;
6018 -- Find subprogram (if any) that encloses instance and/or generic body
6020 function True_Sloc
(N
: Node_Id
) return Source_Ptr
;
6021 -- If the instance is nested inside a generic unit, the Sloc of the
6022 -- instance indicates the place of the original definition, not the
6023 -- point of the current enclosing instance. Pending a better usage of
6024 -- Slocs to indicate instantiation places, we determine the place of
6025 -- origin of a node by finding the maximum sloc of any ancestor node.
6026 -- Why is this not equivalent to Top_Level_Location ???
6028 --------------------
6029 -- Enclosing_Subp --
6030 --------------------
6032 function Enclosing_Subp
(Id
: Entity_Id
) return Entity_Id
is
6033 Scop
: Entity_Id
:= Scope
(Id
);
6036 while Scop
/= Standard_Standard
6037 and then not Is_Overloadable
(Scop
)
6039 Scop
:= Scope
(Scop
);
6049 function True_Sloc
(N
: Node_Id
) return Source_Ptr
is
6056 while Present
(N1
) and then N1
/= Act_Unit
loop
6057 if Sloc
(N1
) > Res
then
6067 -- Start of processing for Install_Body
6070 -- If the body is a subunit, the freeze point is the corresponding
6071 -- stub in the current compilation, not the subunit itself.
6073 if Nkind
(Parent
(Gen_Body
)) = N_Subunit
then
6074 Orig_Body
:= Corresponding_Stub
(Parent
(Gen_Body
));
6076 Orig_Body
:= Gen_Body
;
6079 Body_Unit
:= Unit
(Cunit
(Get_Source_Unit
(Orig_Body
)));
6081 -- If the instantiation and the generic definition appear in the
6082 -- same package declaration, this is an early instantiation.
6083 -- If they appear in the same declarative part, it is an early
6084 -- instantiation only if the generic body appears textually later,
6085 -- and the generic body is also in the main unit.
6087 -- If instance is nested within a subprogram, and the generic body is
6088 -- not, the instance is delayed because the enclosing body is. If
6089 -- instance and body are within the same scope, or the same sub-
6090 -- program body, indicate explicitly that the instance is delayed.
6093 (Gen_Unit
= Act_Unit
6094 and then ((Nkind
(Gen_Unit
) = N_Package_Declaration
)
6095 or else Nkind
(Gen_Unit
) = N_Generic_Package_Declaration
6096 or else (Gen_Unit
= Body_Unit
6097 and then True_Sloc
(N
) < Sloc
(Orig_Body
)))
6098 and then Is_In_Main_Unit
(Gen_Unit
)
6099 and then (Scope
(Act_Id
) = Scope
(Gen_Id
)
6101 Enclosing_Subp
(Act_Id
) = Enclosing_Subp
(Gen_Id
)));
6103 -- If this is an early instantiation, the freeze node is placed after
6104 -- the generic body. Otherwise, if the generic appears in an instance,
6105 -- we cannot freeze the current instance until the outer one is frozen.
6106 -- This is only relevant if the current instance is nested within some
6107 -- inner scope not itself within the outer instance. If this scope is
6108 -- a package body in the same declarative part as the outer instance,
6109 -- then that body needs to be frozen after the outer instance. Finally,
6110 -- if no delay is needed, we place the freeze node at the end of the
6111 -- current declarative part.
6113 if Expander_Active
then
6114 Ensure_Freeze_Node
(Act_Id
);
6115 F_Node
:= Freeze_Node
(Act_Id
);
6118 Insert_After
(Orig_Body
, F_Node
);
6120 elsif Is_Generic_Instance
(Par
)
6121 and then Present
(Freeze_Node
(Par
))
6122 and then Scope
(Act_Id
) /= Par
6124 -- Freeze instance of inner generic after instance of enclosing
6127 if In_Same_Declarative_Part
(Freeze_Node
(Par
), N
) then
6128 Insert_After
(Freeze_Node
(Par
), F_Node
);
6130 -- Freeze package enclosing instance of inner generic after
6131 -- instance of enclosing generic.
6133 elsif Nkind
(Parent
(N
)) = N_Package_Body
6134 and then In_Same_Declarative_Part
(Freeze_Node
(Par
), Parent
(N
))
6138 Enclosing
: constant Entity_Id
:=
6139 Corresponding_Spec
(Parent
(N
));
6142 Insert_After_Last_Decl
(N
, F_Node
);
6143 Ensure_Freeze_Node
(Enclosing
);
6145 if not Is_List_Member
(Freeze_Node
(Enclosing
)) then
6146 Insert_After
(Freeze_Node
(Par
), Freeze_Node
(Enclosing
));
6151 Insert_After_Last_Decl
(N
, F_Node
);
6155 Insert_After_Last_Decl
(N
, F_Node
);
6159 Set_Is_Frozen
(Act_Id
);
6160 Insert_Before
(N
, Act_Body
);
6161 Mark_Rewrite_Insertion
(Act_Body
);
6164 --------------------
6165 -- Install_Parent --
6166 --------------------
6168 procedure Install_Parent
(P
: Entity_Id
; In_Body
: Boolean := False) is
6169 Ancestors
: constant Elist_Id
:= New_Elmt_List
;
6170 S
: constant Entity_Id
:= Current_Scope
;
6171 Inst_Par
: Entity_Id
;
6172 First_Par
: Entity_Id
;
6173 Inst_Node
: Node_Id
;
6174 Gen_Par
: Entity_Id
;
6175 First_Gen
: Entity_Id
;
6178 procedure Install_Formal_Packages
(Par
: Entity_Id
);
6179 -- If any of the formals of the parent are formal packages with box,
6180 -- their formal parts are visible in the parent and thus in the child
6181 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6182 -- for the unit itself.
6184 procedure Install_Noninstance_Specs
(Par
: Entity_Id
);
6185 -- Install the scopes of noninstance parent units ending with Par
6187 procedure Install_Spec
(Par
: Entity_Id
);
6188 -- The child unit is within the declarative part of the parent, so
6189 -- the declarations within the parent are immediately visible.
6191 -----------------------------
6192 -- Install_Formal_Packages --
6193 -----------------------------
6195 procedure Install_Formal_Packages
(Par
: Entity_Id
) is
6199 E
:= First_Entity
(Par
);
6200 while Present
(E
) loop
6201 if Ekind
(E
) = E_Package
6202 and then Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
6204 -- If this is the renaming for the parent instance, done
6206 if Renamed_Object
(E
) = Par
then
6209 -- The visibility of a formal of an enclosing generic is
6212 elsif Denotes_Formal_Package
(E
) then
6215 elsif Present
(Associated_Formal_Package
(E
))
6216 and then Box_Present
(Parent
(Associated_Formal_Package
(E
)))
6218 Check_Generic_Actuals
(Renamed_Object
(E
), True);
6219 Set_Is_Hidden
(E
, False);
6225 end Install_Formal_Packages
;
6227 -------------------------------
6228 -- Install_Noninstance_Specs --
6229 -------------------------------
6231 procedure Install_Noninstance_Specs
(Par
: Entity_Id
) is
6234 and then Par
/= Standard_Standard
6235 and then not In_Open_Scopes
(Par
)
6237 Install_Noninstance_Specs
(Scope
(Par
));
6240 end Install_Noninstance_Specs
;
6246 procedure Install_Spec
(Par
: Entity_Id
) is
6247 Spec
: constant Node_Id
:=
6248 Specification
(Unit_Declaration_Node
(Par
));
6251 if not Is_Child_Unit
(Par
) then
6252 Parent_Unit_Visible
:= Is_Immediately_Visible
(Par
);
6256 Set_Is_Immediately_Visible
(Par
);
6257 Install_Visible_Declarations
(Par
);
6258 Install_Private_Declarations
(Par
);
6259 Set_Use
(Visible_Declarations
(Spec
));
6260 Set_Use
(Private_Declarations
(Spec
));
6263 -- Start of processing for Install_Parent
6266 -- We need to install the parent instance to compile the instantiation
6267 -- of the child, but the child instance must appear in the current
6268 -- scope. Given that we cannot place the parent above the current
6269 -- scope in the scope stack, we duplicate the current scope and unstack
6270 -- both after the instantiation is complete.
6272 -- If the parent is itself the instantiation of a child unit, we must
6273 -- also stack the instantiation of its parent, and so on. Each such
6274 -- ancestor is the prefix of the name in a prior instantiation.
6276 -- If this is a nested instance, the parent unit itself resolves to
6277 -- a renaming of the parent instance, whose declaration we need.
6279 -- Finally, the parent may be a generic (not an instance) when the
6280 -- child unit appears as a formal package.
6284 if Present
(Renamed_Entity
(Inst_Par
)) then
6285 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6288 First_Par
:= Inst_Par
;
6291 Generic_Parent
(Specification
(Unit_Declaration_Node
(Inst_Par
)));
6293 First_Gen
:= Gen_Par
;
6295 while Present
(Gen_Par
)
6296 and then Is_Child_Unit
(Gen_Par
)
6298 -- Load grandparent instance as well
6300 Inst_Node
:= Get_Package_Instantiation_Node
(Inst_Par
);
6302 if Nkind
(Name
(Inst_Node
)) = N_Expanded_Name
then
6303 Inst_Par
:= Entity
(Prefix
(Name
(Inst_Node
)));
6305 if Present
(Renamed_Entity
(Inst_Par
)) then
6306 Inst_Par
:= Renamed_Entity
(Inst_Par
);
6311 (Specification
(Unit_Declaration_Node
(Inst_Par
)));
6313 if Present
(Gen_Par
) then
6314 Prepend_Elmt
(Inst_Par
, Ancestors
);
6317 -- Parent is not the name of an instantiation
6319 Install_Noninstance_Specs
(Inst_Par
);
6331 if Present
(First_Gen
) then
6332 Append_Elmt
(First_Par
, Ancestors
);
6335 Install_Noninstance_Specs
(First_Par
);
6338 if not Is_Empty_Elmt_List
(Ancestors
) then
6339 Elmt
:= First_Elmt
(Ancestors
);
6341 while Present
(Elmt
) loop
6342 Install_Spec
(Node
(Elmt
));
6343 Install_Formal_Packages
(Node
(Elmt
));
6354 --------------------------------
6355 -- Instantiate_Formal_Package --
6356 --------------------------------
6358 function Instantiate_Formal_Package
6361 Analyzed_Formal
: Node_Id
) return List_Id
6363 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
6364 Actual_Pack
: Entity_Id
;
6365 Formal_Pack
: Entity_Id
;
6366 Gen_Parent
: Entity_Id
;
6369 Parent_Spec
: Node_Id
;
6371 procedure Find_Matching_Actual
6373 Act
: in out Entity_Id
);
6374 -- We need to associate each formal entity in the formal package
6375 -- with the corresponding entity in the actual package. The actual
6376 -- package has been analyzed and possibly expanded, and as a result
6377 -- there is no one-to-one correspondence between the two lists (for
6378 -- example, the actual may include subtypes, itypes, and inherited
6379 -- primitive operations, interspersed among the renaming declarations
6380 -- for the actuals) . We retrieve the corresponding actual by name
6381 -- because each actual has the same name as the formal, and they do
6382 -- appear in the same order.
6384 function Formal_Entity
6386 Act_Ent
: Entity_Id
) return Entity_Id
;
6387 -- Returns the entity associated with the given formal F. In the
6388 -- case where F is a formal package, this function will iterate
6389 -- through all of F's formals and enter map associations from the
6390 -- actuals occurring in the formal package's corresponding actual
6391 -- package (obtained via Act_Ent) to the formal package's formal
6392 -- parameters. This function is called recursively for arbitrary
6393 -- levels of formal packages.
6395 function Is_Instance_Of
6396 (Act_Spec
: Entity_Id
;
6397 Gen_Anc
: Entity_Id
) return Boolean;
6398 -- The actual can be an instantiation of a generic within another
6399 -- instance, in which case there is no direct link from it to the
6400 -- original generic ancestor. In that case, we recognize that the
6401 -- ultimate ancestor is the same by examining names and scopes.
6403 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
);
6404 -- Within the generic part, entities in the formal package are
6405 -- visible. To validate subsequent type declarations, indicate
6406 -- the correspondence betwen the entities in the analyzed formal,
6407 -- and the entities in the actual package. There are three packages
6408 -- involved in the instantiation of a formal package: the parent
6409 -- generic P1 which appears in the generic declaration, the fake
6410 -- instantiation P2 which appears in the analyzed generic, and whose
6411 -- visible entities may be used in subsequent formals, and the actual
6412 -- P3 in the instance. To validate subsequent formals, me indicate
6413 -- that the entities in P2 are mapped into those of P3. The mapping of
6414 -- entities has to be done recursively for nested packages.
6416 procedure Process_Nested_Formal
(Formal
: Entity_Id
);
6417 -- If the current formal is declared with a box, its own formals are
6418 -- visible in the instance, as they were in the generic, and their
6419 -- Hidden flag must be reset. If some of these formals are themselves
6420 -- packages declared with a box, the processing must be recursive.
6422 --------------------------
6423 -- Find_Matching_Actual --
6424 --------------------------
6426 procedure Find_Matching_Actual
6428 Act
: in out Entity_Id
)
6430 Formal_Ent
: Entity_Id
;
6433 case Nkind
(Original_Node
(F
)) is
6434 when N_Formal_Object_Declaration |
6435 N_Formal_Type_Declaration
=>
6436 Formal_Ent
:= Defining_Identifier
(F
);
6438 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6442 when N_Formal_Subprogram_Declaration |
6443 N_Formal_Package_Declaration |
6444 N_Package_Declaration |
6445 N_Generic_Package_Declaration
=>
6446 Formal_Ent
:= Defining_Entity
(F
);
6448 while Chars
(Act
) /= Chars
(Formal_Ent
) loop
6453 raise Program_Error
;
6455 end Find_Matching_Actual
;
6461 function Formal_Entity
6463 Act_Ent
: Entity_Id
) return Entity_Id
6465 Orig_Node
: Node_Id
:= F
;
6466 Act_Pkg
: Entity_Id
;
6469 case Nkind
(Original_Node
(F
)) is
6470 when N_Formal_Object_Declaration
=>
6471 return Defining_Identifier
(F
);
6473 when N_Formal_Type_Declaration
=>
6474 return Defining_Identifier
(F
);
6476 when N_Formal_Subprogram_Declaration
=>
6477 return Defining_Unit_Name
(Specification
(F
));
6479 when N_Package_Declaration
=>
6480 return Defining_Unit_Name
(Specification
(F
));
6482 when N_Formal_Package_Declaration |
6483 N_Generic_Package_Declaration
=>
6485 if Nkind
(F
) = N_Generic_Package_Declaration
then
6486 Orig_Node
:= Original_Node
(F
);
6491 -- Find matching actual package, skipping over itypes and
6492 -- other entities generated when analyzing the formal. We
6493 -- know that if the instantiation is legal then there is
6494 -- a matching package for the formal.
6496 while Ekind
(Act_Pkg
) /= E_Package
loop
6497 Act_Pkg
:= Next_Entity
(Act_Pkg
);
6501 Actual_Ent
: Entity_Id
:= First_Entity
(Act_Pkg
);
6502 Formal_Node
: Node_Id
;
6503 Formal_Ent
: Entity_Id
;
6505 Gen_Decl
: constant Node_Id
:=
6506 Unit_Declaration_Node
6507 (Entity
(Name
(Orig_Node
)));
6509 Formals
: constant List_Id
:=
6510 Generic_Formal_Declarations
(Gen_Decl
);
6513 if Present
(Formals
) then
6514 Formal_Node
:= First_Non_Pragma
(Formals
);
6516 Formal_Node
:= Empty
;
6519 while Present
(Actual_Ent
)
6520 and then Present
(Formal_Node
)
6521 and then Actual_Ent
/= First_Private_Entity
(Act_Pkg
)
6523 -- ??? Are the following calls also needed here:
6525 -- Set_Is_Hidden (Actual_Ent, False);
6526 -- Set_Is_Potentially_Use_Visible
6527 -- (Actual_Ent, In_Use (Act_Ent));
6529 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6530 if Present
(Formal_Ent
) then
6531 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6533 Next_Non_Pragma
(Formal_Node
);
6535 Next_Entity
(Actual_Ent
);
6539 return Defining_Identifier
(Orig_Node
);
6541 when N_Use_Package_Clause
=>
6544 when N_Use_Type_Clause
=>
6547 -- We return Empty for all other encountered forms of
6548 -- declarations because there are some cases of nonformal
6549 -- sorts of declaration that can show up (e.g., when array
6550 -- formals are present). Since it's not clear what kinds
6551 -- can appear among the formals, we won't raise failure here.
6559 --------------------
6560 -- Is_Instance_Of --
6561 --------------------
6563 function Is_Instance_Of
6564 (Act_Spec
: Entity_Id
;
6565 Gen_Anc
: Entity_Id
) return Boolean
6567 Gen_Par
: constant Entity_Id
:= Generic_Parent
(Act_Spec
);
6570 if No
(Gen_Par
) then
6573 -- Simplest case: the generic parent of the actual is the formal
6575 elsif Gen_Par
= Gen_Anc
then
6578 elsif Chars
(Gen_Par
) /= Chars
(Gen_Anc
) then
6581 -- The actual may be obtained through several instantiations. Its
6582 -- scope must itself be an instance of a generic declared in the
6583 -- same scope as the formal. Any other case is detected above.
6585 elsif not Is_Generic_Instance
(Scope
(Gen_Par
)) then
6589 return Generic_Parent
(Parent
(Scope
(Gen_Par
))) = Scope
(Gen_Anc
);
6597 procedure Map_Entities
(Form
: Entity_Id
; Act
: Entity_Id
) is
6602 Set_Instance_Of
(Form
, Act
);
6604 -- Traverse formal and actual package to map the corresponding
6605 -- entities. We skip over internal entities that may be generated
6606 -- during semantic analysis, and find the matching entities by
6607 -- name, given that they must appear in the same order.
6609 E1
:= First_Entity
(Form
);
6610 E2
:= First_Entity
(Act
);
6612 and then E1
/= First_Private_Entity
(Form
)
6614 if not Is_Internal
(E1
)
6615 and then not Is_Class_Wide_Type
(E1
)
6616 and then Present
(Parent
(E1
))
6619 and then Chars
(E2
) /= Chars
(E1
)
6627 Set_Instance_Of
(E1
, E2
);
6630 and then Is_Tagged_Type
(E2
)
6633 (Class_Wide_Type
(E1
), Class_Wide_Type
(E2
));
6636 if Ekind
(E1
) = E_Package
6637 and then No
(Renamed_Object
(E1
))
6639 Map_Entities
(E1
, E2
);
6648 ---------------------------
6649 -- Process_Nested_Formal --
6650 ---------------------------
6652 procedure Process_Nested_Formal
(Formal
: Entity_Id
) is
6656 if Present
(Associated_Formal_Package
(Formal
))
6657 and then Box_Present
(Parent
(Associated_Formal_Package
(Formal
)))
6659 Ent
:= First_Entity
(Formal
);
6660 while Present
(Ent
) loop
6661 Set_Is_Hidden
(Ent
, False);
6662 Set_Is_Potentially_Use_Visible
6663 (Ent
, Is_Potentially_Use_Visible
(Formal
));
6665 if Ekind
(Ent
) = E_Package
then
6666 exit when Renamed_Entity
(Ent
) = Renamed_Entity
(Formal
);
6667 Process_Nested_Formal
(Ent
);
6673 end Process_Nested_Formal
;
6675 -- Start of processing for Instantiate_Formal_Package
6680 if not Is_Entity_Name
(Actual
)
6681 or else Ekind
(Entity
(Actual
)) /= E_Package
6684 ("expect package instance to instantiate formal", Actual
);
6685 Abandon_Instantiation
(Actual
);
6686 raise Program_Error
;
6689 Actual_Pack
:= Entity
(Actual
);
6690 Set_Is_Instantiated
(Actual_Pack
);
6692 -- The actual may be a renamed package, or an outer generic
6693 -- formal package whose instantiation is converted into a renaming.
6695 if Present
(Renamed_Object
(Actual_Pack
)) then
6696 Actual_Pack
:= Renamed_Object
(Actual_Pack
);
6699 if Nkind
(Analyzed_Formal
) = N_Formal_Package_Declaration
then
6700 Gen_Parent
:= Get_Instance_Of
(Entity
(Name
(Analyzed_Formal
)));
6701 Formal_Pack
:= Defining_Identifier
(Analyzed_Formal
);
6704 Generic_Parent
(Specification
(Analyzed_Formal
));
6706 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6709 if Nkind
(Parent
(Actual_Pack
)) = N_Defining_Program_Unit_Name
then
6710 Parent_Spec
:= Specification
(Unit_Declaration_Node
(Actual_Pack
));
6712 Parent_Spec
:= Parent
(Actual_Pack
);
6715 if Gen_Parent
= Any_Id
then
6717 ("previous error in declaration of formal package", Actual
);
6718 Abandon_Instantiation
(Actual
);
6721 Is_Instance_Of
(Parent_Spec
, Get_Instance_Of
(Gen_Parent
))
6727 ("actual parameter must be instance of&", Actual
, Gen_Parent
);
6728 Abandon_Instantiation
(Actual
);
6731 Set_Instance_Of
(Defining_Identifier
(Formal
), Actual_Pack
);
6732 Map_Entities
(Formal_Pack
, Actual_Pack
);
6735 Make_Package_Renaming_Declaration
(Loc
,
6736 Defining_Unit_Name
=> New_Copy
(Defining_Identifier
(Formal
)),
6737 Name
=> New_Reference_To
(Actual_Pack
, Loc
));
6739 Set_Associated_Formal_Package
(Defining_Unit_Name
(Nod
),
6740 Defining_Identifier
(Formal
));
6741 Decls
:= New_List
(Nod
);
6743 -- If the formal F has a box, then the generic declarations are
6744 -- visible in the generic G. In an instance of G, the corresponding
6745 -- entities in the actual for F (which are the actuals for the
6746 -- instantiation of the generic that F denotes) must also be made
6747 -- visible for analysis of the current instance. On exit from the
6748 -- current instance, those entities are made private again. If the
6749 -- actual is currently in use, these entities are also use-visible.
6751 -- The loop through the actual entities also steps through the
6752 -- formal entities and enters associations from formals to
6753 -- actuals into the renaming map. This is necessary to properly
6754 -- handle checking of actual parameter associations for later
6755 -- formals that depend on actuals declared in the formal package.
6757 if Box_Present
(Formal
) then
6759 Gen_Decl
: constant Node_Id
:=
6760 Unit_Declaration_Node
(Gen_Parent
);
6761 Formals
: constant List_Id
:=
6762 Generic_Formal_Declarations
(Gen_Decl
);
6763 Actual_Ent
: Entity_Id
;
6764 Formal_Node
: Node_Id
;
6765 Formal_Ent
: Entity_Id
;
6768 if Present
(Formals
) then
6769 Formal_Node
:= First_Non_Pragma
(Formals
);
6771 Formal_Node
:= Empty
;
6774 Actual_Ent
:= First_Entity
(Actual_Pack
);
6776 while Present
(Actual_Ent
)
6777 and then Actual_Ent
/= First_Private_Entity
(Actual_Pack
)
6779 Set_Is_Hidden
(Actual_Ent
, False);
6780 Set_Is_Potentially_Use_Visible
6781 (Actual_Ent
, In_Use
(Actual_Pack
));
6783 if Ekind
(Actual_Ent
) = E_Package
then
6784 Process_Nested_Formal
(Actual_Ent
);
6787 if Present
(Formal_Node
) then
6788 Formal_Ent
:= Formal_Entity
(Formal_Node
, Actual_Ent
);
6790 if Present
(Formal_Ent
) then
6791 Find_Matching_Actual
(Formal_Node
, Actual_Ent
);
6792 Set_Instance_Of
(Formal_Ent
, Actual_Ent
);
6795 Next_Non_Pragma
(Formal_Node
);
6798 -- No further formals to match, but the generic
6799 -- part may contain inherited operation that are
6800 -- not hidden in the enclosing instance.
6802 Next_Entity
(Actual_Ent
);
6808 -- If the formal is not declared with a box, reanalyze it as
6809 -- an instantiation, to verify the matching rules of 12.7. The
6810 -- actual checks are performed after the generic associations
6815 I_Pack
: constant Entity_Id
:=
6816 Make_Defining_Identifier
(Sloc
(Actual
),
6817 Chars
=> New_Internal_Name
('P'));
6820 Set_Is_Internal
(I_Pack
);
6823 Make_Package_Instantiation
(Sloc
(Actual
),
6824 Defining_Unit_Name
=> I_Pack
,
6825 Name
=> New_Occurrence_Of
(Gen_Parent
, Sloc
(Actual
)),
6826 Generic_Associations
=>
6827 Generic_Associations
(Formal
)));
6833 end Instantiate_Formal_Package
;
6835 -----------------------------------
6836 -- Instantiate_Formal_Subprogram --
6837 -----------------------------------
6839 function Instantiate_Formal_Subprogram
6842 Analyzed_Formal
: Node_Id
) return Node_Id
6844 Loc
: Source_Ptr
:= Sloc
(Instantiation_Node
);
6845 Formal_Sub
: constant Entity_Id
:=
6846 Defining_Unit_Name
(Specification
(Formal
));
6847 Analyzed_S
: constant Entity_Id
:=
6848 Defining_Unit_Name
(Specification
(Analyzed_Formal
));
6849 Decl_Node
: Node_Id
;
6853 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean;
6854 -- If the generic is a child unit, the parent has been installed on the
6855 -- scope stack, but a default subprogram cannot resolve to something on
6856 -- the parent because that parent is not really part of the visible
6857 -- context (it is there to resolve explicit local entities). If the
6858 -- default has resolved in this way, we remove the entity from
6859 -- immediate visibility and analyze the node again to emit an error
6860 -- message or find another visible candidate.
6862 procedure Valid_Actual_Subprogram
(Act
: Node_Id
);
6863 -- Perform legality check and raise exception on failure
6865 -----------------------
6866 -- From_Parent_Scope --
6867 -----------------------
6869 function From_Parent_Scope
(Subp
: Entity_Id
) return Boolean is
6870 Gen_Scope
: Node_Id
:= Scope
(Analyzed_S
);
6873 while Present
(Gen_Scope
)
6874 and then Is_Child_Unit
(Gen_Scope
)
6876 if Scope
(Subp
) = Scope
(Gen_Scope
) then
6880 Gen_Scope
:= Scope
(Gen_Scope
);
6884 end From_Parent_Scope
;
6886 -----------------------------
6887 -- Valid_Actual_Subprogram --
6888 -----------------------------
6890 procedure Valid_Actual_Subprogram
(Act
: Node_Id
) is
6891 Act_E
: Entity_Id
:= Empty
;
6894 if Is_Entity_Name
(Act
) then
6895 Act_E
:= Entity
(Act
);
6896 elsif Nkind
(Act
) = N_Selected_Component
6897 and then Is_Entity_Name
(Selector_Name
(Act
))
6899 Act_E
:= Entity
(Selector_Name
(Act
));
6902 if (Present
(Act_E
) and then Is_Overloadable
(Act_E
))
6903 or else Nkind
(Act
) = N_Attribute_Reference
6904 or else Nkind
(Act
) = N_Indexed_Component
6905 or else Nkind
(Act
) = N_Character_Literal
6906 or else Nkind
(Act
) = N_Explicit_Dereference
6912 ("expect subprogram or entry name in instantiation of&",
6913 Instantiation_Node
, Formal_Sub
);
6914 Abandon_Instantiation
(Instantiation_Node
);
6916 end Valid_Actual_Subprogram
;
6918 -- Start of processing for Instantiate_Formal_Subprogram
6921 New_Spec
:= New_Copy_Tree
(Specification
(Formal
));
6923 -- Create new entity for the actual (New_Copy_Tree does not)
6925 Set_Defining_Unit_Name
6926 (New_Spec
, Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
6928 -- Find entity of actual. If the actual is an attribute reference, it
6929 -- cannot be resolved here (its formal is missing) but is handled
6930 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6931 -- fully resolved subsequently, when the renaming declaration for the
6932 -- formal is analyzed. If it is an explicit dereference, resolve the
6933 -- prefix but not the actual itself, to prevent interpretation as a
6936 if Present
(Actual
) then
6937 Loc
:= Sloc
(Actual
);
6938 Set_Sloc
(New_Spec
, Loc
);
6940 if Nkind
(Actual
) = N_Operator_Symbol
then
6941 Find_Direct_Name
(Actual
);
6943 elsif Nkind
(Actual
) = N_Explicit_Dereference
then
6944 Analyze
(Prefix
(Actual
));
6946 elsif Nkind
(Actual
) /= N_Attribute_Reference
then
6950 Valid_Actual_Subprogram
(Actual
);
6953 elsif Present
(Default_Name
(Formal
)) then
6954 if Nkind
(Default_Name
(Formal
)) /= N_Attribute_Reference
6955 and then Nkind
(Default_Name
(Formal
)) /= N_Selected_Component
6956 and then Nkind
(Default_Name
(Formal
)) /= N_Indexed_Component
6957 and then Nkind
(Default_Name
(Formal
)) /= N_Character_Literal
6958 and then Present
(Entity
(Default_Name
(Formal
)))
6960 Nam
:= New_Occurrence_Of
(Entity
(Default_Name
(Formal
)), Loc
);
6962 Nam
:= New_Copy
(Default_Name
(Formal
));
6963 Set_Sloc
(Nam
, Loc
);
6966 elsif Box_Present
(Formal
) then
6968 -- Actual is resolved at the point of instantiation. Create
6969 -- an identifier or operator with the same name as the formal.
6971 if Nkind
(Formal_Sub
) = N_Defining_Operator_Symbol
then
6972 Nam
:= Make_Operator_Symbol
(Loc
,
6973 Chars
=> Chars
(Formal_Sub
),
6974 Strval
=> No_String
);
6976 Nam
:= Make_Identifier
(Loc
, Chars
(Formal_Sub
));
6980 Error_Msg_Sloc
:= Sloc
(Scope
(Analyzed_S
));
6982 ("missing actual&", Instantiation_Node
, Formal_Sub
);
6984 ("\in instantiation of & declared#",
6985 Instantiation_Node
, Scope
(Analyzed_S
));
6986 Abandon_Instantiation
(Instantiation_Node
);
6990 Make_Subprogram_Renaming_Declaration
(Loc
,
6991 Specification
=> New_Spec
,
6994 -- If we do not have an actual and the formal specified <> then
6995 -- set to get proper default.
6997 if No
(Actual
) and then Box_Present
(Formal
) then
6998 Set_From_Default
(Decl_Node
);
7001 -- Gather possible interpretations for the actual before analyzing the
7002 -- instance. If overloaded, it will be resolved when analyzing the
7003 -- renaming declaration.
7005 if Box_Present
(Formal
)
7006 and then No
(Actual
)
7010 if Is_Child_Unit
(Scope
(Analyzed_S
))
7011 and then Present
(Entity
(Nam
))
7013 if not Is_Overloaded
(Nam
) then
7015 if From_Parent_Scope
(Entity
(Nam
)) then
7016 Set_Is_Immediately_Visible
(Entity
(Nam
), False);
7017 Set_Entity
(Nam
, Empty
);
7018 Set_Etype
(Nam
, Empty
);
7022 Set_Is_Immediately_Visible
(Entity
(Nam
));
7031 Get_First_Interp
(Nam
, I
, It
);
7033 while Present
(It
.Nam
) loop
7034 if From_Parent_Scope
(It
.Nam
) then
7038 Get_Next_Interp
(I
, It
);
7045 -- The generic instantiation freezes the actual. This can only be
7046 -- done once the actual is resolved, in the analysis of the renaming
7047 -- declaration. To make the formal subprogram entity available, we set
7048 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7049 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7050 -- of formal abstract subprograms.
7052 Set_Corresponding_Formal_Spec
(Decl_Node
, Analyzed_S
);
7054 -- We cannot analyze the renaming declaration, and thus find the
7055 -- actual, until the all the actuals are assembled in the instance.
7056 -- For subsequent checks of other actuals, indicate the node that
7057 -- will hold the instance of this formal.
7059 Set_Instance_Of
(Analyzed_S
, Nam
);
7061 if Nkind
(Actual
) = N_Selected_Component
7062 and then Is_Task_Type
(Etype
(Prefix
(Actual
)))
7063 and then not Is_Frozen
(Etype
(Prefix
(Actual
)))
7065 -- The renaming declaration will create a body, which must appear
7066 -- outside of the instantiation, We move the renaming declaration
7067 -- out of the instance, and create an additional renaming inside,
7068 -- to prevent freezing anomalies.
7071 Anon_Id
: constant Entity_Id
:=
7072 Make_Defining_Identifier
7073 (Loc
, New_Internal_Name
('E'));
7075 Set_Defining_Unit_Name
(New_Spec
, Anon_Id
);
7076 Insert_Before
(Instantiation_Node
, Decl_Node
);
7077 Analyze
(Decl_Node
);
7079 -- Now create renaming within the instance
7082 Make_Subprogram_Renaming_Declaration
(Loc
,
7083 Specification
=> New_Copy_Tree
(New_Spec
),
7084 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7086 Set_Defining_Unit_Name
(Specification
(Decl_Node
),
7087 Make_Defining_Identifier
(Loc
, Chars
(Formal_Sub
)));
7092 end Instantiate_Formal_Subprogram
;
7094 ------------------------
7095 -- Instantiate_Object --
7096 ------------------------
7098 function Instantiate_Object
7101 Analyzed_Formal
: Node_Id
) return List_Id
7103 Formal_Id
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7104 Type_Id
: constant Node_Id
:= Subtype_Mark
(Formal
);
7105 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7106 Act_Assoc
: constant Node_Id
:= Parent
(Actual
);
7107 Orig_Ftyp
: constant Entity_Id
:=
7108 Etype
(Defining_Identifier
(Analyzed_Formal
));
7109 List
: constant List_Id
:= New_List
;
7111 Decl_Node
: Node_Id
;
7112 Subt_Decl
: Node_Id
:= Empty
;
7115 -- Sloc for error message on missing actual
7117 Error_Msg_Sloc
:= Sloc
(Scope
(Defining_Identifier
(Analyzed_Formal
)));
7119 if Get_Instance_Of
(Formal_Id
) /= Formal_Id
then
7120 Error_Msg_N
("duplicate instantiation of generic parameter", Actual
);
7123 Set_Parent
(List
, Parent
(Actual
));
7127 if Out_Present
(Formal
) then
7129 -- An IN OUT generic actual must be a name. The instantiation is a
7130 -- renaming declaration. The actual is the name being renamed. We
7131 -- use the actual directly, rather than a copy, because it is not
7132 -- used further in the list of actuals, and because a copy or a use
7133 -- of relocate_node is incorrect if the instance is nested within a
7134 -- generic. In order to simplify ASIS searches, the Generic_Parent
7135 -- field links the declaration to the generic association.
7140 Instantiation_Node
, Formal_Id
);
7142 ("\in instantiation of & declared#",
7144 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7145 Abandon_Instantiation
(Instantiation_Node
);
7149 Make_Object_Renaming_Declaration
(Loc
,
7150 Defining_Identifier
=> New_Copy
(Formal_Id
),
7151 Subtype_Mark
=> New_Copy_Tree
(Type_Id
),
7154 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7156 -- The analysis of the actual may produce insert_action nodes, so
7157 -- the declaration must have a context in which to attach them.
7159 Append
(Decl_Node
, List
);
7162 -- Return if the analysis of the actual reported some error
7164 if Etype
(Actual
) = Any_Type
then
7168 -- This check is performed here because Analyze_Object_Renaming
7169 -- will not check it when Comes_From_Source is False. Note
7170 -- though that the check for the actual being the name of an
7171 -- object will be performed in Analyze_Object_Renaming.
7173 if Is_Object_Reference
(Actual
)
7174 and then Is_Dependent_Component_Of_Mutable_Object
(Actual
)
7177 ("illegal discriminant-dependent component for in out parameter",
7181 -- The actual has to be resolved in order to check that it is
7182 -- a variable (due to cases such as F(1), where F returns
7183 -- access to an array, and for overloaded prefixes).
7186 Get_Instance_Of
(Etype
(Defining_Identifier
(Analyzed_Formal
)));
7188 if Is_Private_Type
(Ftyp
)
7189 and then not Is_Private_Type
(Etype
(Actual
))
7190 and then (Base_Type
(Full_View
(Ftyp
)) = Base_Type
(Etype
(Actual
))
7191 or else Base_Type
(Etype
(Actual
)) = Ftyp
)
7193 -- If the actual has the type of the full view of the formal,
7194 -- or else a non-private subtype of the formal, then
7195 -- the visibility of the formal type has changed. Add to the
7196 -- actuals a subtype declaration that will force the exchange
7197 -- of views in the body of the instance as well.
7200 Make_Subtype_Declaration
(Loc
,
7201 Defining_Identifier
=>
7202 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P')),
7203 Subtype_Indication
=> New_Occurrence_Of
(Ftyp
, Loc
));
7205 Prepend
(Subt_Decl
, List
);
7207 Append_Elmt
(Full_View
(Ftyp
), Exchanged_Views
);
7208 Exchange_Declarations
(Ftyp
);
7211 Resolve
(Actual
, Ftyp
);
7213 if not Is_Variable
(Actual
) or else Paren_Count
(Actual
) > 0 then
7215 ("actual for& must be a variable", Actual
, Formal_Id
);
7217 elsif Base_Type
(Ftyp
) /= Base_Type
(Etype
(Actual
)) then
7219 "type of actual does not match type of&", Actual
, Formal_Id
);
7223 Note_Possible_Modification
(Actual
);
7225 -- Check for instantiation of atomic/volatile actual for
7226 -- non-atomic/volatile formal (RM C.6 (12)).
7228 if Is_Atomic_Object
(Actual
)
7229 and then not Is_Atomic
(Orig_Ftyp
)
7232 ("cannot instantiate non-atomic formal object " &
7233 "with atomic actual", Actual
);
7235 elsif Is_Volatile_Object
(Actual
)
7236 and then not Is_Volatile
(Orig_Ftyp
)
7239 ("cannot instantiate non-volatile formal object " &
7240 "with volatile actual", Actual
);
7246 -- The instantiation of a generic formal in-parameter
7247 -- is a constant declaration. The actual is the expression for
7248 -- that declaration.
7250 if Present
(Actual
) then
7252 Decl_Node
:= Make_Object_Declaration
(Loc
,
7253 Defining_Identifier
=> New_Copy
(Formal_Id
),
7254 Constant_Present
=> True,
7255 Object_Definition
=> New_Copy_Tree
(Type_Id
),
7256 Expression
=> Actual
);
7258 Set_Corresponding_Generic_Association
(Decl_Node
, Act_Assoc
);
7260 -- A generic formal object of a tagged type is defined
7261 -- to be aliased so the new constant must also be treated
7265 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7267 Set_Aliased_Present
(Decl_Node
);
7270 Append
(Decl_Node
, List
);
7272 -- No need to repeat (pre-)analysis of some expression nodes
7273 -- already handled in Pre_Analyze_Actuals.
7275 if Nkind
(Actual
) /= N_Allocator
then
7278 -- Return if the analysis of the actual reported some error
7280 if Etype
(Actual
) = Any_Type
then
7286 Typ
: constant Entity_Id
:=
7288 (Etype
(Defining_Identifier
(Analyzed_Formal
)));
7291 Freeze_Before
(Instantiation_Node
, Typ
);
7293 -- If the actual is an aggregate, perform name resolution on
7294 -- its components (the analysis of an aggregate does not do
7295 -- it) to capture local names that may be hidden if the
7296 -- generic is a child unit.
7298 if Nkind
(Actual
) = N_Aggregate
then
7299 Pre_Analyze_And_Resolve
(Actual
, Typ
);
7303 elsif Present
(Expression
(Formal
)) then
7305 -- Use default to construct declaration
7308 Make_Object_Declaration
(Sloc
(Formal
),
7309 Defining_Identifier
=> New_Copy
(Formal_Id
),
7310 Constant_Present
=> True,
7311 Object_Definition
=> New_Copy
(Type_Id
),
7312 Expression
=> New_Copy_Tree
(Expression
(Formal
)));
7314 Append
(Decl_Node
, List
);
7315 Set_Analyzed
(Expression
(Decl_Node
), False);
7320 Instantiation_Node
, Formal_Id
);
7321 Error_Msg_NE
("\in instantiation of & declared#",
7323 Scope
(Defining_Identifier
(Analyzed_Formal
)));
7326 (Etype
(Defining_Identifier
(Analyzed_Formal
)))
7328 -- Create dummy constant declaration so that instance can
7329 -- be analyzed, to minimize cascaded visibility errors.
7332 Make_Object_Declaration
(Loc
,
7333 Defining_Identifier
=> New_Copy
(Formal_Id
),
7334 Constant_Present
=> True,
7335 Object_Definition
=> New_Copy
(Type_Id
),
7337 Make_Attribute_Reference
(Sloc
(Formal_Id
),
7338 Attribute_Name
=> Name_First
,
7339 Prefix
=> New_Copy
(Type_Id
)));
7341 Append
(Decl_Node
, List
);
7344 Abandon_Instantiation
(Instantiation_Node
);
7351 end Instantiate_Object
;
7353 ------------------------------
7354 -- Instantiate_Package_Body --
7355 ------------------------------
7357 procedure Instantiate_Package_Body
7358 (Body_Info
: Pending_Body_Info
;
7359 Inlined_Body
: Boolean := False)
7361 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7362 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7363 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7365 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7366 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7367 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7368 Act_Spec
: constant Node_Id
:= Specification
(Act_Decl
);
7369 Act_Decl_Id
: constant Entity_Id
:= Defining_Entity
(Act_Spec
);
7371 Act_Body_Name
: Node_Id
;
7373 Gen_Body_Id
: Node_Id
;
7375 Act_Body_Id
: Entity_Id
;
7377 Parent_Installed
: Boolean := False;
7378 Save_Style_Check
: constant Boolean := Style_Check
;
7381 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7383 -- The instance body may already have been processed, as the parent
7384 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7386 if Present
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
7390 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7392 if No
(Gen_Body_Id
) then
7393 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7394 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7397 -- Establish global variable for sloc adjustment and for error
7400 Instantiation_Node
:= Inst_Node
;
7402 if Present
(Gen_Body_Id
) then
7403 Save_Env
(Gen_Unit
, Act_Decl_Id
);
7404 Style_Check
:= False;
7405 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7407 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7409 Create_Instantiation_Source
7410 (Inst_Node
, Gen_Body_Id
, False, S_Adjustment
);
7414 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7416 -- Build new name (possibly qualified) for body declaration
7418 Act_Body_Id
:= New_Copy
(Act_Decl_Id
);
7420 -- Some attributes of the spec entity are not inherited by the
7423 Set_Handler_Records
(Act_Body_Id
, No_List
);
7425 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7426 N_Defining_Program_Unit_Name
7429 Make_Defining_Program_Unit_Name
(Loc
,
7430 Name
=> New_Copy_Tree
(Name
(Defining_Unit_Name
(Act_Spec
))),
7431 Defining_Identifier
=> Act_Body_Id
);
7433 Act_Body_Name
:= Act_Body_Id
;
7436 Set_Defining_Unit_Name
(Act_Body
, Act_Body_Name
);
7438 Set_Corresponding_Spec
(Act_Body
, Act_Decl_Id
);
7439 Check_Generic_Actuals
(Act_Decl_Id
, False);
7441 -- If it is a child unit, make the parent instance (which is an
7442 -- instance of the parent of the generic) visible. The parent
7443 -- instance is the prefix of the name of the generic unit.
7445 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7446 and then Nkind
(Gen_Id
) = N_Expanded_Name
7448 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7449 Parent_Installed
:= True;
7451 elsif Is_Child_Unit
(Gen_Unit
) then
7452 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7453 Parent_Installed
:= True;
7456 -- If the instantiation is a library unit, and this is the main
7457 -- unit, then build the resulting compilation unit nodes for the
7458 -- instance. If this is a compilation unit but it is not the main
7459 -- unit, then it is the body of a unit in the context, that is being
7460 -- compiled because it is encloses some inlined unit or another
7461 -- generic unit being instantiated. In that case, this body is not
7462 -- part of the current compilation, and is not attached to the tree,
7463 -- but its parent must be set for analysis.
7465 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7467 -- Replace instance node with body of instance, and create
7468 -- new node for corresponding instance declaration.
7470 Build_Instance_Compilation_Unit_Nodes
7471 (Inst_Node
, Act_Body
, Act_Decl
);
7472 Analyze
(Inst_Node
);
7474 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7476 -- If the instance is a child unit itself, then set the
7477 -- scope of the expanded body to be the parent of the
7478 -- instantiation (ensuring that the fully qualified name
7479 -- will be generated for the elaboration subprogram).
7481 if Nkind
(Defining_Unit_Name
(Act_Spec
)) =
7482 N_Defining_Program_Unit_Name
7485 (Defining_Entity
(Inst_Node
), Scope
(Act_Decl_Id
));
7489 -- Case where instantiation is not a library unit
7492 -- If this is an early instantiation, i.e. appears textually
7493 -- before the corresponding body and must be elaborated first,
7494 -- indicate that the body instance is to be delayed.
7496 Install_Body
(Act_Body
, Inst_Node
, Gen_Body
, Gen_Decl
);
7498 -- Now analyze the body. We turn off all checks if this is
7499 -- an internal unit, since there is no reason to have checks
7500 -- on for any predefined run-time library code. All such
7501 -- code is designed to be compiled with checks off.
7503 -- Note that we do NOT apply this criterion to children of
7504 -- GNAT (or on VMS, children of DEC). The latter units must
7505 -- suppress checks explicitly if this is needed.
7507 if Is_Predefined_File_Name
7508 (Unit_File_Name
(Get_Source_Unit
(Gen_Decl
)))
7510 Analyze
(Act_Body
, Suppress
=> All_Checks
);
7516 if not Generic_Separately_Compiled
(Gen_Unit
) then
7517 Inherit_Context
(Gen_Body
, Inst_Node
);
7520 -- Remove the parent instances if they have been placed on the
7521 -- scope stack to compile the body.
7523 if Parent_Installed
then
7524 Remove_Parent
(In_Body
=> True);
7527 Restore_Private_Views
(Act_Decl_Id
);
7529 -- Remove the current unit from visibility if this is an instance
7530 -- that is not elaborated on the fly for inlining purposes.
7532 if not Inlined_Body
then
7533 Set_Is_Immediately_Visible
(Act_Decl_Id
, False);
7537 Style_Check
:= Save_Style_Check
;
7539 -- If we have no body, and the unit requires a body, then complain.
7540 -- This complaint is suppressed if we have detected other errors
7541 -- (since a common reason for missing the body is that it had errors).
7543 elsif Unit_Requires_Body
(Gen_Unit
) then
7544 if Serious_Errors_Detected
= 0 then
7546 ("cannot find body of generic package &", Inst_Node
, Gen_Unit
);
7548 -- Don't attempt to perform any cleanup actions if some other
7549 -- error was aready detected, since this can cause blowups.
7555 -- Case of package that does not need a body
7558 -- If the instantiation of the declaration is a library unit,
7559 -- rewrite the original package instantiation as a package
7560 -- declaration in the compilation unit node.
7562 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7563 Set_Parent_Spec
(Act_Decl
, Parent_Spec
(Inst_Node
));
7564 Rewrite
(Inst_Node
, Act_Decl
);
7566 -- Generate elaboration entity, in case spec has elaboration
7567 -- code. This cannot be done when the instance is analyzed,
7568 -- because it is not known yet whether the body exists.
7570 Set_Elaboration_Entity_Required
(Act_Decl_Id
, False);
7571 Build_Elaboration_Entity
(Parent
(Inst_Node
), Act_Decl_Id
);
7573 -- If the instantiation is not a library unit, then append the
7574 -- declaration to the list of implicitly generated entities.
7575 -- unless it is already a list member which means that it was
7576 -- already processed
7578 elsif not Is_List_Member
(Act_Decl
) then
7579 Mark_Rewrite_Insertion
(Act_Decl
);
7580 Insert_Before
(Inst_Node
, Act_Decl
);
7584 Expander_Mode_Restore
;
7585 end Instantiate_Package_Body
;
7587 ---------------------------------
7588 -- Instantiate_Subprogram_Body --
7589 ---------------------------------
7591 procedure Instantiate_Subprogram_Body
7592 (Body_Info
: Pending_Body_Info
)
7594 Act_Decl
: constant Node_Id
:= Body_Info
.Act_Decl
;
7595 Inst_Node
: constant Node_Id
:= Body_Info
.Inst_Node
;
7596 Loc
: constant Source_Ptr
:= Sloc
(Inst_Node
);
7597 Gen_Id
: constant Node_Id
:= Name
(Inst_Node
);
7598 Gen_Unit
: constant Entity_Id
:= Get_Generic_Entity
(Inst_Node
);
7599 Gen_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Gen_Unit
);
7600 Anon_Id
: constant Entity_Id
:=
7601 Defining_Unit_Name
(Specification
(Act_Decl
));
7602 Pack_Id
: constant Entity_Id
:=
7603 Defining_Unit_Name
(Parent
(Act_Decl
));
7606 Gen_Body_Id
: Node_Id
;
7608 Act_Body_Id
: Entity_Id
;
7609 Pack_Body
: Node_Id
;
7610 Prev_Formal
: Entity_Id
;
7612 Unit_Renaming
: Node_Id
;
7614 Parent_Installed
: Boolean := False;
7615 Save_Style_Check
: constant Boolean := Style_Check
;
7618 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7620 Expander_Mode_Save_And_Set
(Body_Info
.Expander_Status
);
7622 if No
(Gen_Body_Id
) then
7623 Load_Parent_Of_Generic
(Inst_Node
, Specification
(Gen_Decl
));
7624 Gen_Body_Id
:= Corresponding_Body
(Gen_Decl
);
7627 Instantiation_Node
:= Inst_Node
;
7629 if Present
(Gen_Body_Id
) then
7630 Gen_Body
:= Unit_Declaration_Node
(Gen_Body_Id
);
7632 if Nkind
(Gen_Body
) = N_Subprogram_Body_Stub
then
7634 -- Either body is not present, or context is non-expanding, as
7635 -- when compiling a subunit. Mark the instance as completed, and
7636 -- diagnose a missing body when needed.
7639 and then Operating_Mode
= Generate_Code
7642 ("missing proper body for instantiation", Gen_Body
);
7645 Set_Has_Completion
(Anon_Id
);
7649 Save_Env
(Gen_Unit
, Anon_Id
);
7650 Style_Check
:= False;
7651 Current_Sem_Unit
:= Body_Info
.Current_Sem_Unit
;
7652 Create_Instantiation_Source
7660 (Original_Node
(Gen_Body
), Empty
, Instantiating
=> True);
7661 Act_Body_Id
:= Defining_Entity
(Act_Body
);
7662 Set_Chars
(Act_Body_Id
, Chars
(Anon_Id
));
7663 Set_Sloc
(Act_Body_Id
, Sloc
(Defining_Entity
(Inst_Node
)));
7664 Set_Corresponding_Spec
(Act_Body
, Anon_Id
);
7665 Set_Has_Completion
(Anon_Id
);
7666 Check_Generic_Actuals
(Pack_Id
, False);
7668 -- If it is a child unit, make the parent instance (which is an
7669 -- instance of the parent of the generic) visible. The parent
7670 -- instance is the prefix of the name of the generic unit.
7672 if Ekind
(Scope
(Gen_Unit
)) = E_Generic_Package
7673 and then Nkind
(Gen_Id
) = N_Expanded_Name
7675 Install_Parent
(Entity
(Prefix
(Gen_Id
)), In_Body
=> True);
7676 Parent_Installed
:= True;
7678 elsif Is_Child_Unit
(Gen_Unit
) then
7679 Install_Parent
(Scope
(Gen_Unit
), In_Body
=> True);
7680 Parent_Installed
:= True;
7683 -- Inside its body, a reference to the generic unit is a reference
7684 -- to the instance. The corresponding renaming is the first
7685 -- declaration in the body.
7688 Make_Subprogram_Renaming_Declaration
(Loc
,
7691 Specification
(Original_Node
(Gen_Body
)),
7693 Instantiating
=> True),
7694 Name
=> New_Occurrence_Of
(Anon_Id
, Loc
));
7696 -- If there is a formal subprogram with the same name as the
7697 -- unit itself, do not add this renaming declaration. This is
7698 -- a temporary fix for one ACVC test. ???
7700 Prev_Formal
:= First_Entity
(Pack_Id
);
7701 while Present
(Prev_Formal
) loop
7702 if Chars
(Prev_Formal
) = Chars
(Gen_Unit
)
7703 and then Is_Overloadable
(Prev_Formal
)
7708 Next_Entity
(Prev_Formal
);
7711 if Present
(Prev_Formal
) then
7712 Decls
:= New_List
(Act_Body
);
7714 Decls
:= New_List
(Unit_Renaming
, Act_Body
);
7717 -- The subprogram body is placed in the body of a dummy package
7718 -- body, whose spec contains the subprogram declaration as well
7719 -- as the renaming declarations for the generic parameters.
7721 Pack_Body
:= Make_Package_Body
(Loc
,
7722 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7723 Declarations
=> Decls
);
7725 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7727 -- If the instantiation is a library unit, then build resulting
7728 -- compilation unit nodes for the instance. The declaration of
7729 -- the enclosing package is the grandparent of the subprogram
7730 -- declaration. First replace the instantiation node as the unit
7731 -- of the corresponding compilation.
7733 if Nkind
(Parent
(Inst_Node
)) = N_Compilation_Unit
then
7734 if Parent
(Inst_Node
) = Cunit
(Main_Unit
) then
7735 Set_Unit
(Parent
(Inst_Node
), Inst_Node
);
7736 Build_Instance_Compilation_Unit_Nodes
7737 (Inst_Node
, Pack_Body
, Parent
(Parent
(Act_Decl
)));
7738 Analyze
(Inst_Node
);
7740 Set_Parent
(Pack_Body
, Parent
(Inst_Node
));
7741 Analyze
(Pack_Body
);
7745 Insert_Before
(Inst_Node
, Pack_Body
);
7746 Mark_Rewrite_Insertion
(Pack_Body
);
7747 Analyze
(Pack_Body
);
7749 if Expander_Active
then
7750 Freeze_Subprogram_Body
(Inst_Node
, Gen_Body
, Pack_Id
);
7754 if not Generic_Separately_Compiled
(Gen_Unit
) then
7755 Inherit_Context
(Gen_Body
, Inst_Node
);
7758 Restore_Private_Views
(Pack_Id
, False);
7760 if Parent_Installed
then
7761 Remove_Parent
(In_Body
=> True);
7765 Style_Check
:= Save_Style_Check
;
7767 -- Body not found. Error was emitted already. If there were no
7768 -- previous errors, this may be an instance whose scope is a premature
7769 -- instance. In that case we must insure that the (legal) program does
7770 -- raise program error if executed. We generate a subprogram body for
7771 -- this purpose. See DEC ac30vso.
7773 elsif Serious_Errors_Detected
= 0
7774 and then Nkind
(Parent
(Inst_Node
)) /= N_Compilation_Unit
7776 if Ekind
(Anon_Id
) = E_Procedure
then
7778 Make_Subprogram_Body
(Loc
,
7780 Make_Procedure_Specification
(Loc
,
7781 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7782 Parameter_Specifications
=>
7784 (Parameter_Specifications
(Parent
(Anon_Id
)))),
7786 Declarations
=> Empty_List
,
7787 Handled_Statement_Sequence
=>
7788 Make_Handled_Sequence_Of_Statements
(Loc
,
7791 Make_Raise_Program_Error
(Loc
,
7793 PE_Access_Before_Elaboration
))));
7797 Make_Raise_Program_Error
(Loc
,
7798 Reason
=> PE_Access_Before_Elaboration
);
7800 Set_Etype
(Ret_Expr
, (Etype
(Anon_Id
)));
7801 Set_Analyzed
(Ret_Expr
);
7804 Make_Subprogram_Body
(Loc
,
7806 Make_Function_Specification
(Loc
,
7807 Defining_Unit_Name
=> New_Copy
(Anon_Id
),
7808 Parameter_Specifications
=>
7810 (Parameter_Specifications
(Parent
(Anon_Id
))),
7812 New_Occurrence_Of
(Etype
(Anon_Id
), Loc
)),
7814 Declarations
=> Empty_List
,
7815 Handled_Statement_Sequence
=>
7816 Make_Handled_Sequence_Of_Statements
(Loc
,
7818 New_List
(Make_Return_Statement
(Loc
, Ret_Expr
))));
7821 Pack_Body
:= Make_Package_Body
(Loc
,
7822 Defining_Unit_Name
=> New_Copy
(Pack_Id
),
7823 Declarations
=> New_List
(Act_Body
));
7825 Insert_After
(Inst_Node
, Pack_Body
);
7826 Set_Corresponding_Spec
(Pack_Body
, Pack_Id
);
7827 Analyze
(Pack_Body
);
7830 Expander_Mode_Restore
;
7831 end Instantiate_Subprogram_Body
;
7833 ----------------------
7834 -- Instantiate_Type --
7835 ----------------------
7837 function Instantiate_Type
7840 Analyzed_Formal
: Node_Id
;
7841 Actual_Decls
: List_Id
) return Node_Id
7843 Loc
: constant Source_Ptr
:= Sloc
(Actual
);
7844 Gen_T
: constant Entity_Id
:= Defining_Identifier
(Formal
);
7845 A_Gen_T
: constant Entity_Id
:= Defining_Identifier
(Analyzed_Formal
);
7846 Ancestor
: Entity_Id
:= Empty
;
7847 Def
: constant Node_Id
:= Formal_Type_Definition
(Formal
);
7849 Decl_Node
: Node_Id
;
7851 procedure Validate_Array_Type_Instance
;
7852 procedure Validate_Access_Subprogram_Instance
;
7853 procedure Validate_Access_Type_Instance
;
7854 procedure Validate_Derived_Type_Instance
;
7855 procedure Validate_Private_Type_Instance
;
7856 -- These procedures perform validation tests for the named case
7858 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean;
7859 -- Check that base types are the same and that the subtypes match
7860 -- statically. Used in several of the above.
7862 --------------------
7863 -- Subtypes_Match --
7864 --------------------
7866 function Subtypes_Match
(Gen_T
, Act_T
: Entity_Id
) return Boolean is
7867 T
: constant Entity_Id
:= Get_Instance_Of
(Gen_T
);
7870 return (Base_Type
(T
) = Base_Type
(Act_T
)
7871 -- why is the and then commented out here???
7872 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7873 and then Subtypes_Statically_Match
(T
, Act_T
))
7875 or else (Is_Class_Wide_Type
(Gen_T
)
7876 and then Is_Class_Wide_Type
(Act_T
)
7879 Get_Instance_Of
(Root_Type
(Gen_T
)),
7880 Root_Type
(Act_T
)));
7883 -----------------------------------------
7884 -- Validate_Access_Subprogram_Instance --
7885 -----------------------------------------
7887 procedure Validate_Access_Subprogram_Instance
is
7889 if not Is_Access_Type
(Act_T
)
7890 or else Ekind
(Designated_Type
(Act_T
)) /= E_Subprogram_Type
7893 ("expect access type in instantiation of &", Actual
, Gen_T
);
7894 Abandon_Instantiation
(Actual
);
7897 Check_Mode_Conformant
7898 (Designated_Type
(Act_T
),
7899 Designated_Type
(A_Gen_T
),
7903 if Ekind
(Base_Type
(Act_T
)) = E_Access_Protected_Subprogram_Type
then
7904 if Ekind
(A_Gen_T
) = E_Access_Subprogram_Type
then
7906 ("protected access type not allowed for formal &",
7910 elsif Ekind
(A_Gen_T
) = E_Access_Protected_Subprogram_Type
then
7912 ("expect protected access type for formal &",
7915 end Validate_Access_Subprogram_Instance
;
7917 -----------------------------------
7918 -- Validate_Access_Type_Instance --
7919 -----------------------------------
7921 procedure Validate_Access_Type_Instance
is
7922 Desig_Type
: constant Entity_Id
:=
7924 (Designated_Type
(A_Gen_T
), Scope
(A_Gen_T
));
7927 if not Is_Access_Type
(Act_T
) then
7929 ("expect access type in instantiation of &", Actual
, Gen_T
);
7930 Abandon_Instantiation
(Actual
);
7933 if Is_Access_Constant
(A_Gen_T
) then
7934 if not Is_Access_Constant
(Act_T
) then
7936 ("actual type must be access-to-constant type", Actual
);
7937 Abandon_Instantiation
(Actual
);
7940 if Is_Access_Constant
(Act_T
) then
7942 ("actual type must be access-to-variable type", Actual
);
7943 Abandon_Instantiation
(Actual
);
7945 elsif Ekind
(A_Gen_T
) = E_General_Access_Type
7946 and then Ekind
(Base_Type
(Act_T
)) /= E_General_Access_Type
7948 Error_Msg_N
("actual must be general access type!", Actual
);
7949 Error_Msg_NE
("add ALL to }!", Actual
, Act_T
);
7950 Abandon_Instantiation
(Actual
);
7954 -- The designated subtypes, that is to say the subtypes introduced
7955 -- by an access type declaration (and not by a subtype declaration)
7958 if not Subtypes_Match
7959 (Desig_Type
, Designated_Type
(Base_Type
(Act_T
)))
7962 ("designated type of actual does not match that of formal &",
7964 Abandon_Instantiation
(Actual
);
7966 elsif Is_Access_Type
(Designated_Type
(Act_T
))
7967 and then Is_Constrained
(Designated_Type
(Designated_Type
(Act_T
)))
7969 Is_Constrained
(Designated_Type
(Desig_Type
))
7972 ("designated type of actual does not match that of formal &",
7974 Abandon_Instantiation
(Actual
);
7976 end Validate_Access_Type_Instance
;
7978 ----------------------------------
7979 -- Validate_Array_Type_Instance --
7980 ----------------------------------
7982 procedure Validate_Array_Type_Instance
is
7987 function Formal_Dimensions
return Int
;
7988 -- Count number of dimensions in array type formal
7990 -----------------------
7991 -- Formal_Dimensions --
7992 -----------------------
7994 function Formal_Dimensions
return Int
is
7999 if Nkind
(Def
) = N_Constrained_Array_Definition
then
8000 Index
:= First
(Discrete_Subtype_Definitions
(Def
));
8002 Index
:= First
(Subtype_Marks
(Def
));
8005 while Present
(Index
) loop
8011 end Formal_Dimensions
;
8013 -- Start of processing for Validate_Array_Type_Instance
8016 if not Is_Array_Type
(Act_T
) then
8018 ("expect array type in instantiation of &", Actual
, Gen_T
);
8019 Abandon_Instantiation
(Actual
);
8021 elsif Nkind
(Def
) = N_Constrained_Array_Definition
then
8022 if not (Is_Constrained
(Act_T
)) then
8024 ("expect constrained array in instantiation of &",
8026 Abandon_Instantiation
(Actual
);
8030 if Is_Constrained
(Act_T
) then
8032 ("expect unconstrained array in instantiation of &",
8034 Abandon_Instantiation
(Actual
);
8038 if Formal_Dimensions
/= Number_Dimensions
(Act_T
) then
8040 ("dimensions of actual do not match formal &", Actual
, Gen_T
);
8041 Abandon_Instantiation
(Actual
);
8044 I1
:= First_Index
(A_Gen_T
);
8045 I2
:= First_Index
(Act_T
);
8046 for J
in 1 .. Formal_Dimensions
loop
8048 -- If the indices of the actual were given by a subtype_mark,
8049 -- the index was transformed into a range attribute. Retrieve
8050 -- the original type mark for checking.
8052 if Is_Entity_Name
(Original_Node
(I2
)) then
8053 T2
:= Entity
(Original_Node
(I2
));
8058 if not Subtypes_Match
8059 (Find_Actual_Type
(Etype
(I1
), Scope
(A_Gen_T
)), T2
)
8062 ("index types of actual do not match those of formal &",
8064 Abandon_Instantiation
(Actual
);
8071 if not Subtypes_Match
(
8072 Find_Actual_Type
(Component_Type
(A_Gen_T
), Scope
(A_Gen_T
)),
8073 Component_Type
(Act_T
))
8076 ("component subtype of actual does not match that of formal &",
8078 Abandon_Instantiation
(Actual
);
8081 if Has_Aliased_Components
(A_Gen_T
)
8082 and then not Has_Aliased_Components
(Act_T
)
8085 ("actual must have aliased components to match formal type &",
8089 end Validate_Array_Type_Instance
;
8091 ------------------------------------
8092 -- Validate_Derived_Type_Instance --
8093 ------------------------------------
8095 procedure Validate_Derived_Type_Instance
is
8096 Actual_Discr
: Entity_Id
;
8097 Ancestor_Discr
: Entity_Id
;
8100 -- If the parent type in the generic declaration is itself
8101 -- a previous formal type, then it is local to the generic
8102 -- and absent from the analyzed generic definition. In that
8103 -- case the ancestor is the instance of the formal (which must
8104 -- have been instantiated previously), unless the ancestor is
8105 -- itself a formal derived type. In this latter case (which is the
8106 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8107 -- formals is the ancestor of its parent. Otherwise, the analyzed
8108 -- generic carries the parent type. If the parent type is defined
8109 -- in a previous formal package, then the scope of that formal
8110 -- package is that of the generic type itself, and it has already
8111 -- been mapped into the corresponding type in the actual package.
8113 -- Common case: parent type defined outside of the generic
8115 if Is_Entity_Name
(Subtype_Mark
(Def
))
8116 and then Present
(Entity
(Subtype_Mark
(Def
)))
8118 Ancestor
:= Get_Instance_Of
(Entity
(Subtype_Mark
(Def
)));
8120 -- Check whether parent is defined in a previous formal package
8123 Scope
(Scope
(Base_Type
(Etype
(A_Gen_T
)))) = Scope
(A_Gen_T
)
8126 Get_Instance_Of
(Base_Type
(Etype
(A_Gen_T
)));
8128 -- The type may be a local derivation, or a type extension of
8129 -- a previous formal, or of a formal of a parent package.
8131 elsif Is_Derived_Type
(Get_Instance_Of
(A_Gen_T
))
8133 Ekind
(Get_Instance_Of
(A_Gen_T
)) = E_Record_Type_With_Private
8135 -- Check whether the parent is another derived formal type
8136 -- in the same generic unit.
8138 if Etype
(A_Gen_T
) /= A_Gen_T
8139 and then Is_Generic_Type
(Etype
(A_Gen_T
))
8140 and then Scope
(Etype
(A_Gen_T
)) = Scope
(A_Gen_T
)
8141 and then Etype
(Etype
(A_Gen_T
)) /= Etype
(A_Gen_T
)
8143 -- Locate ancestor of parent from the subtype declaration
8144 -- created for the actual.
8150 Decl
:= First
(Actual_Decls
);
8151 while Present
(Decl
) loop
8152 if Nkind
(Decl
) = N_Subtype_Declaration
8153 and then Chars
(Defining_Identifier
(Decl
)) =
8154 Chars
(Etype
(A_Gen_T
))
8156 Ancestor
:= Generic_Parent_Type
(Decl
);
8164 pragma Assert
(Present
(Ancestor
));
8168 Get_Instance_Of
(Base_Type
(Get_Instance_Of
(A_Gen_T
)));
8172 Ancestor
:= Get_Instance_Of
(Etype
(Base_Type
(A_Gen_T
)));
8175 if not Is_Ancestor
(Base_Type
(Ancestor
), Act_T
) then
8177 ("expect type derived from & in instantiation",
8178 Actual
, First_Subtype
(Ancestor
));
8179 Abandon_Instantiation
(Actual
);
8182 -- Perform atomic/volatile checks (RM C.6(12))
8184 if Is_Atomic
(Act_T
) and then not Is_Atomic
(Ancestor
) then
8186 ("cannot have atomic actual type for non-atomic formal type",
8189 elsif Is_Volatile
(Act_T
)
8190 and then not Is_Volatile
(Ancestor
)
8191 and then Is_By_Reference_Type
(Ancestor
)
8194 ("cannot have volatile actual type for non-volatile formal type",
8198 -- It should not be necessary to check for unknown discriminants
8199 -- on Formal, but for some reason Has_Unknown_Discriminants is
8200 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8201 -- returns False. This needs fixing. ???
8203 if not Is_Indefinite_Subtype
(A_Gen_T
)
8204 and then not Unknown_Discriminants_Present
(Formal
)
8205 and then Is_Indefinite_Subtype
(Act_T
)
8208 ("actual subtype must be constrained", Actual
);
8209 Abandon_Instantiation
(Actual
);
8212 if not Unknown_Discriminants_Present
(Formal
) then
8213 if Is_Constrained
(Ancestor
) then
8214 if not Is_Constrained
(Act_T
) then
8216 ("actual subtype must be constrained", Actual
);
8217 Abandon_Instantiation
(Actual
);
8220 -- Ancestor is unconstrained
8222 elsif Is_Constrained
(Act_T
) then
8223 if Ekind
(Ancestor
) = E_Access_Type
8224 or else Is_Composite_Type
(Ancestor
)
8227 ("actual subtype must be unconstrained", Actual
);
8228 Abandon_Instantiation
(Actual
);
8231 -- A class-wide type is only allowed if the formal has
8232 -- unknown discriminants.
8234 elsif Is_Class_Wide_Type
(Act_T
)
8235 and then not Has_Unknown_Discriminants
(Ancestor
)
8238 ("actual for & cannot be a class-wide type", Actual
, Gen_T
);
8239 Abandon_Instantiation
(Actual
);
8241 -- Otherwise, the formal and actual shall have the same
8242 -- number of discriminants and each discriminant of the
8243 -- actual must correspond to a discriminant of the formal.
8245 elsif Has_Discriminants
(Act_T
)
8246 and then not Has_Unknown_Discriminants
(Act_T
)
8247 and then Has_Discriminants
(Ancestor
)
8249 Actual_Discr
:= First_Discriminant
(Act_T
);
8250 Ancestor_Discr
:= First_Discriminant
(Ancestor
);
8251 while Present
(Actual_Discr
)
8252 and then Present
(Ancestor_Discr
)
8254 if Base_Type
(Act_T
) /= Base_Type
(Ancestor
) and then
8255 not Present
(Corresponding_Discriminant
(Actual_Discr
))
8258 ("discriminant & does not correspond " &
8259 "to ancestor discriminant", Actual
, Actual_Discr
);
8260 Abandon_Instantiation
(Actual
);
8263 Next_Discriminant
(Actual_Discr
);
8264 Next_Discriminant
(Ancestor_Discr
);
8267 if Present
(Actual_Discr
) or else Present
(Ancestor_Discr
) then
8269 ("actual for & must have same number of discriminants",
8271 Abandon_Instantiation
(Actual
);
8274 -- This case should be caught by the earlier check for
8275 -- for constrainedness, but the check here is added for
8278 elsif Has_Discriminants
(Act_T
)
8279 and then not Has_Unknown_Discriminants
(Act_T
)
8282 ("actual for & must not have discriminants", Actual
, Gen_T
);
8283 Abandon_Instantiation
(Actual
);
8285 elsif Has_Discriminants
(Ancestor
) then
8287 ("actual for & must have known discriminants", Actual
, Gen_T
);
8288 Abandon_Instantiation
(Actual
);
8291 if not Subtypes_Statically_Compatible
(Act_T
, Ancestor
) then
8293 ("constraint on actual is incompatible with formal", Actual
);
8294 Abandon_Instantiation
(Actual
);
8297 end Validate_Derived_Type_Instance
;
8299 ------------------------------------
8300 -- Validate_Private_Type_Instance --
8301 ------------------------------------
8303 procedure Validate_Private_Type_Instance
is
8304 Formal_Discr
: Entity_Id
;
8305 Actual_Discr
: Entity_Id
;
8306 Formal_Subt
: Entity_Id
;
8309 if Is_Limited_Type
(Act_T
)
8310 and then not Is_Limited_Type
(A_Gen_T
)
8313 ("actual for non-limited & cannot be a limited type", Actual
,
8315 Explain_Limited_Type
(Act_T
, Actual
);
8316 Abandon_Instantiation
(Actual
);
8318 elsif Is_Indefinite_Subtype
(Act_T
)
8319 and then not Is_Indefinite_Subtype
(A_Gen_T
)
8320 and then Ada_Version
>= Ada_95
8323 ("actual for & must be a definite subtype", Actual
, Gen_T
);
8325 elsif not Is_Tagged_Type
(Act_T
)
8326 and then Is_Tagged_Type
(A_Gen_T
)
8329 ("actual for & must be a tagged type", Actual
, Gen_T
);
8331 elsif Has_Discriminants
(A_Gen_T
) then
8332 if not Has_Discriminants
(Act_T
) then
8334 ("actual for & must have discriminants", Actual
, Gen_T
);
8335 Abandon_Instantiation
(Actual
);
8337 elsif Is_Constrained
(Act_T
) then
8339 ("actual for & must be unconstrained", Actual
, Gen_T
);
8340 Abandon_Instantiation
(Actual
);
8343 Formal_Discr
:= First_Discriminant
(A_Gen_T
);
8344 Actual_Discr
:= First_Discriminant
(Act_T
);
8345 while Formal_Discr
/= Empty
loop
8346 if Actual_Discr
= Empty
then
8348 ("discriminants on actual do not match formal",
8350 Abandon_Instantiation
(Actual
);
8353 Formal_Subt
:= Get_Instance_Of
(Etype
(Formal_Discr
));
8355 -- Access discriminants match if designated types do
8357 if Ekind
(Base_Type
(Formal_Subt
)) = E_Anonymous_Access_Type
8358 and then (Ekind
(Base_Type
(Etype
(Actual_Discr
)))) =
8359 E_Anonymous_Access_Type
8362 (Designated_Type
(Base_Type
(Formal_Subt
))) =
8363 Designated_Type
(Base_Type
(Etype
(Actual_Discr
)))
8367 elsif Base_Type
(Formal_Subt
) /=
8368 Base_Type
(Etype
(Actual_Discr
))
8371 ("types of actual discriminants must match formal",
8373 Abandon_Instantiation
(Actual
);
8375 elsif not Subtypes_Statically_Match
8376 (Formal_Subt
, Etype
(Actual_Discr
))
8377 and then Ada_Version
>= Ada_95
8380 ("subtypes of actual discriminants must match formal",
8382 Abandon_Instantiation
(Actual
);
8385 Next_Discriminant
(Formal_Discr
);
8386 Next_Discriminant
(Actual_Discr
);
8389 if Actual_Discr
/= Empty
then
8391 ("discriminants on actual do not match formal",
8393 Abandon_Instantiation
(Actual
);
8400 end Validate_Private_Type_Instance
;
8402 -- Start of processing for Instantiate_Type
8405 if Get_Instance_Of
(A_Gen_T
) /= A_Gen_T
then
8406 Error_Msg_N
("duplicate instantiation of generic type", Actual
);
8409 elsif not Is_Entity_Name
(Actual
)
8410 or else not Is_Type
(Entity
(Actual
))
8413 ("expect valid subtype mark to instantiate &", Actual
, Gen_T
);
8414 Abandon_Instantiation
(Actual
);
8417 Act_T
:= Entity
(Actual
);
8419 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8420 -- as a generic actual parameter if the corresponding formal type
8421 -- does not have a known_discriminant_part, or is a formal derived
8422 -- type that is an Unchecked_Union type.
8424 if Is_Unchecked_Union
(Base_Type
(Act_T
)) then
8425 if not Has_Discriminants
(A_Gen_T
)
8427 (Is_Derived_Type
(A_Gen_T
)
8429 Is_Unchecked_Union
(A_Gen_T
))
8433 Error_Msg_N
("Unchecked_Union cannot be the actual for a" &
8434 " discriminated formal type", Act_T
);
8439 -- Deal with fixed/floating restrictions
8441 if Is_Floating_Point_Type
(Act_T
) then
8442 Check_Restriction
(No_Floating_Point
, Actual
);
8443 elsif Is_Fixed_Point_Type
(Act_T
) then
8444 Check_Restriction
(No_Fixed_Point
, Actual
);
8447 -- Deal with error of using incomplete type as generic actual
8449 if Ekind
(Act_T
) = E_Incomplete_Type
then
8450 if No
(Underlying_Type
(Act_T
)) then
8451 Error_Msg_N
("premature use of incomplete type", Actual
);
8452 Abandon_Instantiation
(Actual
);
8454 Act_T
:= Full_View
(Act_T
);
8455 Set_Entity
(Actual
, Act_T
);
8457 if Has_Private_Component
(Act_T
) then
8459 ("premature use of type with private component", Actual
);
8463 -- Deal with error of premature use of private type as generic actual
8465 elsif Is_Private_Type
(Act_T
)
8466 and then Is_Private_Type
(Base_Type
(Act_T
))
8467 and then not Is_Generic_Type
(Act_T
)
8468 and then not Is_Derived_Type
(Act_T
)
8469 and then No
(Full_View
(Root_Type
(Act_T
)))
8471 Error_Msg_N
("premature use of private type", Actual
);
8473 elsif Has_Private_Component
(Act_T
) then
8475 ("premature use of type with private component", Actual
);
8478 Set_Instance_Of
(A_Gen_T
, Act_T
);
8480 -- If the type is generic, the class-wide type may also be used
8482 if Is_Tagged_Type
(A_Gen_T
)
8483 and then Is_Tagged_Type
(Act_T
)
8484 and then not Is_Class_Wide_Type
(A_Gen_T
)
8486 Set_Instance_Of
(Class_Wide_Type
(A_Gen_T
),
8487 Class_Wide_Type
(Act_T
));
8490 if not Is_Abstract
(A_Gen_T
)
8491 and then Is_Abstract
(Act_T
)
8494 ("actual of non-abstract formal cannot be abstract", Actual
);
8497 if Is_Scalar_Type
(Gen_T
) then
8498 Set_Instance_Of
(Etype
(A_Gen_T
), Etype
(Act_T
));
8503 when N_Formal_Private_Type_Definition
=>
8504 Validate_Private_Type_Instance
;
8506 when N_Formal_Derived_Type_Definition
=>
8507 Validate_Derived_Type_Instance
;
8509 when N_Formal_Discrete_Type_Definition
=>
8510 if not Is_Discrete_Type
(Act_T
) then
8512 ("expect discrete type in instantiation of&", Actual
, Gen_T
);
8513 Abandon_Instantiation
(Actual
);
8516 when N_Formal_Signed_Integer_Type_Definition
=>
8517 if not Is_Signed_Integer_Type
(Act_T
) then
8519 ("expect signed integer type in instantiation of&",
8521 Abandon_Instantiation
(Actual
);
8524 when N_Formal_Modular_Type_Definition
=>
8525 if not Is_Modular_Integer_Type
(Act_T
) then
8527 ("expect modular type in instantiation of &", Actual
, Gen_T
);
8528 Abandon_Instantiation
(Actual
);
8531 when N_Formal_Floating_Point_Definition
=>
8532 if not Is_Floating_Point_Type
(Act_T
) then
8534 ("expect float type in instantiation of &", Actual
, Gen_T
);
8535 Abandon_Instantiation
(Actual
);
8538 when N_Formal_Ordinary_Fixed_Point_Definition
=>
8539 if not Is_Ordinary_Fixed_Point_Type
(Act_T
) then
8541 ("expect ordinary fixed point type in instantiation of &",
8543 Abandon_Instantiation
(Actual
);
8546 when N_Formal_Decimal_Fixed_Point_Definition
=>
8547 if not Is_Decimal_Fixed_Point_Type
(Act_T
) then
8549 ("expect decimal type in instantiation of &",
8551 Abandon_Instantiation
(Actual
);
8554 when N_Array_Type_Definition
=>
8555 Validate_Array_Type_Instance
;
8557 when N_Access_To_Object_Definition
=>
8558 Validate_Access_Type_Instance
;
8560 when N_Access_Function_Definition |
8561 N_Access_Procedure_Definition
=>
8562 Validate_Access_Subprogram_Instance
;
8565 raise Program_Error
;
8570 Make_Subtype_Declaration
(Loc
,
8571 Defining_Identifier
=> New_Copy
(Gen_T
),
8572 Subtype_Indication
=> New_Reference_To
(Act_T
, Loc
));
8574 if Is_Private_Type
(Act_T
) then
8575 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8577 elsif Is_Access_Type
(Act_T
)
8578 and then Is_Private_Type
(Designated_Type
(Act_T
))
8580 Set_Has_Private_View
(Subtype_Indication
(Decl_Node
));
8583 -- Flag actual derived types so their elaboration produces the
8584 -- appropriate renamings for the primitive operations of the ancestor.
8585 -- Flag actual for formal private types as well, to determine whether
8586 -- operations in the private part may override inherited operations.
8588 if Nkind
(Def
) = N_Formal_Derived_Type_Definition
8589 or else Nkind
(Def
) = N_Formal_Private_Type_Definition
8591 Set_Generic_Parent_Type
(Decl_Node
, Ancestor
);
8595 end Instantiate_Type
;
8597 ---------------------
8598 -- Is_In_Main_Unit --
8599 ---------------------
8601 function Is_In_Main_Unit
(N
: Node_Id
) return Boolean is
8602 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(N
);
8603 Current_Unit
: Node_Id
;
8606 if Unum
= Main_Unit
then
8609 -- If the current unit is a subunit then it is either the main unit
8610 -- or is being compiled as part of the main unit.
8612 elsif Nkind
(N
) = N_Compilation_Unit
then
8613 return Nkind
(Unit
(N
)) = N_Subunit
;
8616 Current_Unit
:= Parent
(N
);
8617 while Present
(Current_Unit
)
8618 and then Nkind
(Current_Unit
) /= N_Compilation_Unit
8620 Current_Unit
:= Parent
(Current_Unit
);
8623 -- The instantiation node is in the main unit, or else the current
8624 -- node (perhaps as the result of nested instantiations) is in the
8625 -- main unit, or in the declaration of the main unit, which in this
8626 -- last case must be a body.
8628 return Unum
= Main_Unit
8629 or else Current_Unit
= Cunit
(Main_Unit
)
8630 or else Current_Unit
= Library_Unit
(Cunit
(Main_Unit
))
8631 or else (Present
(Library_Unit
(Current_Unit
))
8632 and then Is_In_Main_Unit
(Library_Unit
(Current_Unit
)));
8633 end Is_In_Main_Unit
;
8635 ----------------------------
8636 -- Load_Parent_Of_Generic --
8637 ----------------------------
8639 procedure Load_Parent_Of_Generic
(N
: Node_Id
; Spec
: Node_Id
) is
8640 Comp_Unit
: constant Node_Id
:= Cunit
(Get_Source_Unit
(Spec
));
8641 Save_Style_Check
: constant Boolean := Style_Check
;
8642 True_Parent
: Node_Id
;
8643 Inst_Node
: Node_Id
;
8647 if not In_Same_Source_Unit
(N
, Spec
)
8648 or else Nkind
(Unit
(Comp_Unit
)) = N_Package_Declaration
8649 or else (Nkind
(Unit
(Comp_Unit
)) = N_Package_Body
8650 and then not Is_In_Main_Unit
(Spec
))
8652 -- Find body of parent of spec, and analyze it. A special case
8653 -- arises when the parent is an instantiation, that is to say when
8654 -- we are currently instantiating a nested generic. In that case,
8655 -- there is no separate file for the body of the enclosing instance.
8656 -- Instead, the enclosing body must be instantiated as if it were
8657 -- a pending instantiation, in order to produce the body for the
8658 -- nested generic we require now. Note that in that case the
8659 -- generic may be defined in a package body, the instance defined
8660 -- in the same package body, and the original enclosing body may not
8661 -- be in the main unit.
8663 True_Parent
:= Parent
(Spec
);
8666 while Present
(True_Parent
)
8667 and then Nkind
(True_Parent
) /= N_Compilation_Unit
8669 if Nkind
(True_Parent
) = N_Package_Declaration
8671 Nkind
(Original_Node
(True_Parent
)) = N_Package_Instantiation
8673 -- Parent is a compilation unit that is an instantiation.
8674 -- Instantiation node has been replaced with package decl.
8676 Inst_Node
:= Original_Node
(True_Parent
);
8679 elsif Nkind
(True_Parent
) = N_Package_Declaration
8680 and then Present
(Generic_Parent
(Specification
(True_Parent
)))
8681 and then Nkind
(Parent
(True_Parent
)) /= N_Compilation_Unit
8683 -- Parent is an instantiation within another specification.
8684 -- Declaration for instance has been inserted before original
8685 -- instantiation node. A direct link would be preferable?
8687 Inst_Node
:= Next
(True_Parent
);
8689 while Present
(Inst_Node
)
8690 and then Nkind
(Inst_Node
) /= N_Package_Instantiation
8695 -- If the instance appears within a generic, and the generic
8696 -- unit is defined within a formal package of the enclosing
8697 -- generic, there is no generic body available, and none
8698 -- needed. A more precise test should be used ???
8700 if No
(Inst_Node
) then
8706 True_Parent
:= Parent
(True_Parent
);
8710 -- Case where we are currently instantiating a nested generic
8712 if Present
(Inst_Node
) then
8713 if Nkind
(Parent
(True_Parent
)) = N_Compilation_Unit
then
8715 -- Instantiation node and declaration of instantiated package
8716 -- were exchanged when only the declaration was needed.
8717 -- Restore instantiation node before proceeding with body.
8719 Set_Unit
(Parent
(True_Parent
), Inst_Node
);
8722 -- Now complete instantiation of enclosing body, if it appears
8723 -- in some other unit. If it appears in the current unit, the
8724 -- body will have been instantiated already.
8726 if No
(Corresponding_Body
(Instance_Spec
(Inst_Node
))) then
8728 -- We need to determine the expander mode to instantiate
8729 -- the enclosing body. Because the generic body we need
8730 -- may use global entities declared in the enclosing package
8731 -- (including aggregates) it is in general necessary to
8732 -- compile this body with expansion enabled. The exception
8733 -- is if we are within a generic package, in which case
8734 -- the usual generic rule applies.
8737 Exp_Status
: Boolean := True;
8741 -- Loop through scopes looking for generic package
8743 Scop
:= Scope
(Defining_Entity
(Instance_Spec
(Inst_Node
)));
8744 while Present
(Scop
)
8745 and then Scop
/= Standard_Standard
8747 if Ekind
(Scop
) = E_Generic_Package
then
8748 Exp_Status
:= False;
8752 Scop
:= Scope
(Scop
);
8755 Instantiate_Package_Body
8756 (Pending_Body_Info
'(
8757 Inst_Node, True_Parent, Exp_Status,
8758 Get_Code_Unit (Sloc (Inst_Node))));
8762 -- Case where we are not instantiating a nested generic
8765 Opt.Style_Check := False;
8766 Expander_Mode_Save_And_Set (True);
8767 Load_Needed_Body (Comp_Unit, OK);
8768 Opt.Style_Check := Save_Style_Check;
8769 Expander_Mode_Restore;
8772 and then Unit_Requires_Body (Defining_Entity (Spec))
8775 Bname : constant Unit_Name_Type :=
8776 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8779 Error_Msg_Unit_1 := Bname;
8780 Error_Msg_N ("this instantiation requires$!", N);
8782 Get_File_Name (Bname, Subunit => False);
8783 Error_Msg_N ("\but file{ was not found!", N);
8784 raise Unrecoverable_Error;
8790 -- If loading the parent of the generic caused an instantiation
8791 -- circularity, we abandon compilation at this point, because
8792 -- otherwise in some cases we get into trouble with infinite
8793 -- recursions after this point.
8795 if Circularity_Detected then
8796 raise Unrecoverable_Error;
8798 end Load_Parent_Of_Generic;
8800 -----------------------
8801 -- Move_Freeze_Nodes --
8802 -----------------------
8804 procedure Move_Freeze_Nodes
8805 (Out_Of : Entity_Id;
8810 Next_Decl : Node_Id;
8811 Next_Node : Node_Id := After;
8814 function Is_Outer_Type (T : Entity_Id) return Boolean;
8815 -- Check whether entity is declared in a scope external to that
8816 -- of the generic unit.
8822 function Is_Outer_Type (T : Entity_Id) return Boolean is
8823 Scop : Entity_Id := Scope (T);
8826 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8830 while Scop /= Standard_Standard loop
8832 if Scop = Out_Of then
8835 Scop := Scope (Scop);
8843 -- Start of processing for Move_Freeze_Nodes
8850 -- First remove the freeze nodes that may appear before all other
8854 while Present (Decl)
8855 and then Nkind (Decl) = N_Freeze_Entity
8856 and then Is_Outer_Type (Entity (Decl))
8858 Decl := Remove_Head (L);
8859 Insert_After (Next_Node, Decl);
8860 Set_Analyzed (Decl, False);
8865 -- Next scan the list of declarations and remove each freeze node that
8866 -- appears ahead of the current node.
8868 while Present (Decl) loop
8869 while Present (Next (Decl))
8870 and then Nkind (Next (Decl)) = N_Freeze_Entity
8871 and then Is_Outer_Type (Entity (Next (Decl)))
8873 Next_Decl := Remove_Next (Decl);
8874 Insert_After (Next_Node, Next_Decl);
8875 Set_Analyzed (Next_Decl, False);
8876 Next_Node := Next_Decl;
8879 -- If the declaration is a nested package or concurrent type, then
8880 -- recurse. Nested generic packages will have been processed from the
8883 if Nkind (Decl) = N_Package_Declaration then
8884 Spec := Specification (Decl);
8886 elsif Nkind (Decl) = N_Task_Type_Declaration then
8887 Spec := Task_Definition (Decl);
8889 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8890 Spec := Protected_Definition (Decl);
8896 if Present (Spec) then
8897 Move_Freeze_Nodes (Out_Of, Next_Node,
8898 Visible_Declarations (Spec));
8899 Move_Freeze_Nodes (Out_Of, Next_Node,
8900 Private_Declarations (Spec));
8905 end Move_Freeze_Nodes;
8911 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8913 return Generic_Renamings.Table (E).Next_In_HTable;
8916 ------------------------
8917 -- Preanalyze_Actuals --
8918 ------------------------
8920 procedure Pre_Analyze_Actuals (N : Node_Id) is
8923 Errs : constant Int := Serious_Errors_Detected;
8926 Assoc := First (Generic_Associations (N));
8928 while Present (Assoc) loop
8929 Act := Explicit_Generic_Actual_Parameter (Assoc);
8931 -- Within a nested instantiation, a defaulted actual is an
8932 -- empty association, so nothing to analyze. If the actual for
8933 -- a subprogram is an attribute, analyze prefix only, because
8934 -- actual is not a complete attribute reference.
8936 -- If actual is an allocator, analyze expression only. The full
8937 -- analysis can generate code, and if the instance is a compilation
8938 -- unit we have to wait until the package instance is installed to
8939 -- have a proper place to insert this code.
8941 -- String literals may be operators, but at this point we do not
8942 -- know whether the actual is a formal subprogram or a string.
8947 elsif Nkind (Act) = N_Attribute_Reference then
8948 Analyze (Prefix (Act));
8950 elsif Nkind (Act) = N_Explicit_Dereference then
8951 Analyze (Prefix (Act));
8953 elsif Nkind (Act) = N_Allocator then
8955 Expr : constant Node_Id := Expression (Act);
8958 if Nkind (Expr) = N_Subtype_Indication then
8959 Analyze (Subtype_Mark (Expr));
8960 Analyze_List (Constraints (Constraint (Expr)));
8966 elsif Nkind (Act) /= N_Operator_Symbol then
8970 if Errs /= Serious_Errors_Detected then
8971 Abandon_Instantiation (Act);
8976 end Pre_Analyze_Actuals;
8982 procedure Remove_Parent (In_Body : Boolean := False) is
8983 S : Entity_Id := Current_Scope;
8989 -- After child instantiation is complete, remove from scope stack
8990 -- the extra copy of the current scope, and then remove parent
8996 while Current_Scope /= S loop
8998 End_Package_Scope (Current_Scope);
9000 if In_Open_Scopes (P) then
9001 E := First_Entity (P);
9003 while Present (E) loop
9004 Set_Is_Immediately_Visible (E, True);
9008 if Is_Generic_Instance (Current_Scope)
9009 and then P /= Current_Scope
9011 -- We are within an instance of some sibling. Retain
9012 -- visibility of parent, for proper subsequent cleanup,
9013 -- and reinstall private declarations as well.
9015 Set_In_Private_Part (P);
9016 Install_Private_Declarations (P);
9019 -- If the ultimate parent is a compilation unit, reset its
9020 -- visibility to what it was before instantiation.
9022 elsif not In_Open_Scopes (Scope (P))
9024 (not Is_Child_Unit (P) and then not Parent_Unit_Visible)
9026 Set_Is_Immediately_Visible (P, False);
9030 -- Reset visibility of entities in the enclosing scope
9032 Set_Is_Hidden_Open_Scope (Current_Scope, False);
9033 Hidden := First_Elmt (Hidden_Entities);
9035 while Present (Hidden) loop
9036 Set_Is_Immediately_Visible (Node (Hidden), True);
9041 -- Each body is analyzed separately, and there is no context
9042 -- that needs preserving from one body instance to the next,
9043 -- so remove all parent scopes that have been installed.
9045 while Present (S) loop
9046 End_Package_Scope (S);
9047 Set_Is_Immediately_Visible (S, False);
9049 exit when S = Standard_Standard;
9059 procedure Restore_Env is
9060 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
9063 Ada_Version := Saved.Ada_Version;
9065 if No (Current_Instantiated_Parent.Act_Id) then
9067 -- Restore environment after subprogram inlining
9069 Restore_Private_Views (Empty);
9072 Current_Instantiated_Parent := Saved.Instantiated_Parent;
9073 Exchanged_Views := Saved.Exchanged_Views;
9074 Hidden_Entities := Saved.Hidden_Entities;
9075 Current_Sem_Unit := Saved.Current_Sem_Unit;
9076 Parent_Unit_Visible := Saved.Parent_Unit_Visible;
9078 Instance_Envs.Decrement_Last;
9081 ---------------------------
9082 -- Restore_Private_Views --
9083 ---------------------------
9085 procedure Restore_Private_Views
9086 (Pack_Id : Entity_Id;
9087 Is_Package : Boolean := True)
9095 procedure Restore_Nested_Formal (Formal : Entity_Id);
9096 -- Hide the generic formals of formal packages declared with box
9097 -- which were reachable in the current instantiation.
9099 procedure Restore_Nested_Formal (Formal : Entity_Id) is
9102 if Present (Renamed_Object (Formal))
9103 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
9107 elsif Present (Associated_Formal_Package (Formal))
9108 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9110 Ent := First_Entity (Formal);
9112 while Present (Ent) loop
9113 exit when Ekind (Ent) = E_Package
9114 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9116 Set_Is_Hidden (Ent);
9117 Set_Is_Potentially_Use_Visible (Ent, False);
9119 -- If package, then recurse
9121 if Ekind (Ent) = E_Package then
9122 Restore_Nested_Formal (Ent);
9128 end Restore_Nested_Formal;
9131 M := First_Elmt (Exchanged_Views);
9132 while Present (M) loop
9135 -- Subtypes of types whose views have been exchanged, and that
9136 -- are defined within the instance, were not on the list of
9137 -- Private_Dependents on entry to the instance, so they have to
9138 -- be exchanged explicitly now, in order to remain consistent with
9139 -- the view of the parent type.
9141 if Ekind (Typ) = E_Private_Type
9142 or else Ekind (Typ) = E_Limited_Private_Type
9143 or else Ekind (Typ) = E_Record_Type_With_Private
9145 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9147 while Present (Dep_Elmt) loop
9148 Dep_Typ := Node (Dep_Elmt);
9150 if Scope (Dep_Typ) = Pack_Id
9151 and then Present (Full_View (Dep_Typ))
9153 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9154 Exchange_Declarations (Dep_Typ);
9157 Next_Elmt (Dep_Elmt);
9161 Exchange_Declarations (Node (M));
9165 if No (Pack_Id) then
9169 -- Make the generic formal parameters private, and make the formal
9170 -- types into subtypes of the actuals again.
9172 E := First_Entity (Pack_Id);
9174 while Present (E) loop
9175 Set_Is_Hidden (E, True);
9178 and then Nkind (Parent (E)) = N_Subtype_Declaration
9180 Set_Is_Generic_Actual_Type (E, False);
9182 -- An unusual case of aliasing: the actual may also be directly
9183 -- visible in the generic, and be private there, while it is
9184 -- fully visible in the context of the instance. The internal
9185 -- subtype is private in the instance, but has full visibility
9186 -- like its parent in the enclosing scope. This enforces the
9187 -- invariant that the privacy status of all private dependents of
9188 -- a type coincide with that of the parent type. This can only
9189 -- happen when a generic child unit is instantiated within a
9192 if Is_Private_Type (E)
9193 and then not Is_Private_Type (Etype (E))
9195 Exchange_Declarations (E);
9198 elsif Ekind (E) = E_Package then
9200 -- The end of the renaming list is the renaming of the generic
9201 -- package itself. If the instance is a subprogram, all entities
9202 -- in the corresponding package are renamings. If this entity is
9203 -- a formal package, make its own formals private as well. The
9204 -- actual in this case is itself the renaming of an instantation.
9205 -- If the entity is not a package renaming, it is the entity
9206 -- created to validate formal package actuals: ignore.
9208 -- If the actual is itself a formal package for the enclosing
9209 -- generic, or the actual for such a formal package, it remains
9210 -- visible on exit from the instance, and therefore nothing
9211 -- needs to be done either, except to keep it accessible.
9214 and then Renamed_Object (E) = Pack_Id
9218 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9221 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9222 Set_Is_Hidden (E, False);
9226 Act_P : constant Entity_Id := Renamed_Object (E);
9230 Id := First_Entity (Act_P);
9232 and then Id /= First_Private_Entity (Act_P)
9234 exit when Ekind (Id) = E_Package
9235 and then Renamed_Object (Id) = Act_P;
9237 Set_Is_Hidden (Id, True);
9238 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9240 if Ekind (Id) = E_Package then
9241 Restore_Nested_Formal (Id);
9252 end Restore_Private_Views;
9259 (Gen_Unit : Entity_Id;
9260 Act_Unit : Entity_Id)
9264 Set_Instance_Env (Gen_Unit, Act_Unit);
9267 ----------------------------
9268 -- Save_Global_References --
9269 ----------------------------
9271 procedure Save_Global_References (N : Node_Id) is
9272 Gen_Scope : Entity_Id;
9276 function Is_Global (E : Entity_Id) return Boolean;
9277 -- Check whether entity is defined outside of generic unit.
9278 -- Examine the scope of an entity, and the scope of the scope,
9279 -- etc, until we find either Standard, in which case the entity
9280 -- is global, or the generic unit itself, which indicates that
9281 -- the entity is local. If the entity is the generic unit itself,
9282 -- as in the case of a recursive call, or the enclosing generic unit,
9283 -- if different from the current scope, then it is local as well,
9284 -- because it will be replaced at the point of instantiation. On
9285 -- the other hand, if it is a reference to a child unit of a common
9286 -- ancestor, which appears in an instantiation, it is global because
9287 -- it is used to denote a specific compilation unit at the time the
9288 -- instantiations will be analyzed.
9290 procedure Reset_Entity (N : Node_Id);
9291 -- Save semantic information on global entity, so that it is not
9292 -- resolved again at instantiation time.
9294 procedure Save_Entity_Descendants (N : Node_Id);
9295 -- Apply Save_Global_References to the two syntactic descendants of
9296 -- non-terminal nodes that carry an Associated_Node and are processed
9297 -- through Reset_Entity. Once the global entity (if any) has been
9298 -- captured together with its type, only two syntactic descendants
9299 -- need to be traversed to complete the processing of the tree rooted
9300 -- at N. This applies to Selected_Components, Expanded_Names, and to
9301 -- Operator nodes. N can also be a character literal, identifier, or
9302 -- operator symbol node, but the call has no effect in these cases.
9304 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9305 -- Default actuals in nested instances must be handled specially
9306 -- because there is no link to them from the original tree. When an
9307 -- actual subprogram is given by a default, we add an explicit generic
9308 -- association for it in the instantiation node. When we save the
9309 -- global references on the name of the instance, we recover the list
9310 -- of generic associations, and add an explicit one to the original
9311 -- generic tree, through which a global actual can be preserved.
9312 -- Similarly, if a child unit is instantiated within a sibling, in the
9313 -- context of the parent, we must preserve the identifier of the parent
9314 -- so that it can be properly resolved in a subsequent instantiation.
9316 procedure Save_Global_Descendant (D : Union_Id);
9317 -- Apply Save_Global_References recursively to the descendents of
9320 procedure Save_References (N : Node_Id);
9321 -- This is the recursive procedure that does the work, once the
9322 -- enclosing generic scope has been established.
9328 function Is_Global (E : Entity_Id) return Boolean is
9329 Se : Entity_Id := Scope (E);
9331 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9332 -- Determine whether the parent node of a reference to a child unit
9333 -- denotes an instantiation or a formal package, in which case the
9334 -- reference to the child unit is global, even if it appears within
9335 -- the current scope (e.g. when the instance appears within the body
9338 ----------------------
9339 -- Is_Instance_Node --
9340 ----------------------
9342 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9344 return (Nkind (Decl) in N_Generic_Instantiation
9346 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9347 end Is_Instance_Node;
9349 -- Start of processing for Is_Global
9352 if E = Gen_Scope then
9355 elsif E = Standard_Standard then
9358 elsif Is_Child_Unit (E)
9359 and then (Is_Instance_Node (Parent (N2))
9360 or else (Nkind (Parent (N2)) = N_Expanded_Name
9361 and then N2 = Selector_Name (Parent (N2))
9362 and then Is_Instance_Node (Parent (Parent (N2)))))
9367 while Se /= Gen_Scope loop
9368 if Se = Standard_Standard then
9383 procedure Reset_Entity (N : Node_Id) is
9385 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9386 -- The type of N2 is global to the generic unit. Save the
9387 -- type in the generic node.
9389 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9390 -- Find the ultimate ancestor of the current unit. If it is
9391 -- not a generic unit, then the name of the current unit
9392 -- in the prefix of an expanded name must be replaced with
9393 -- its generic homonym to ensure that it will be properly
9394 -- resolved in an instance.
9396 ---------------------
9397 -- Set_Global_Type --
9398 ---------------------
9400 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9401 Typ : constant Entity_Id := Etype (N2);
9407 and then Has_Private_View (Entity (N))
9409 -- If the entity of N is not the associated node, this is
9410 -- a nested generic and it has an associated node as well,
9411 -- whose type is already the full view (see below). Indicate
9412 -- that the original node has a private view.
9414 Set_Has_Private_View (N);
9417 -- If not a private type, nothing else to do
9419 if not Is_Private_Type (Typ) then
9420 if Is_Array_Type (Typ)
9421 and then Is_Private_Type (Component_Type (Typ))
9423 Set_Has_Private_View (N);
9426 -- If it is a derivation of a private type in a context where
9427 -- no full view is needed, nothing to do either.
9429 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9432 -- Otherwise mark the type for flipping and use the full_view
9436 Set_Has_Private_View (N);
9438 if Present (Full_View (Typ)) then
9439 Set_Etype (N2, Full_View (Typ));
9442 end Set_Global_Type;
9448 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9449 Par : Entity_Id := E;
9452 while Is_Child_Unit (Par) loop
9459 -- Start of processing for Reset_Entity
9462 N2 := Get_Associated_Node (N);
9466 if Is_Global (E) then
9467 Set_Global_Type (N, N2);
9469 elsif Nkind (N) = N_Op_Concat
9470 and then Is_Generic_Type (Etype (N2))
9472 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9473 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9474 and then Is_Intrinsic_Subprogram (E)
9479 -- Entity is local. Mark generic node as unresolved.
9480 -- Note that now it does not have an entity.
9482 Set_Associated_Node (N, Empty);
9483 Set_Etype (N, Empty);
9486 if (Nkind (Parent (N)) = N_Package_Instantiation
9487 or else Nkind (Parent (N)) = N_Function_Instantiation
9488 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9489 and then N = Name (Parent (N))
9491 Save_Global_Defaults (Parent (N), Parent (N2));
9494 elsif Nkind (Parent (N)) = N_Selected_Component
9495 and then Nkind (Parent (N2)) = N_Expanded_Name
9498 if Is_Global (Entity (Parent (N2))) then
9499 Change_Selected_Component_To_Expanded_Name (Parent (N));
9500 Set_Associated_Node (Parent (N), Parent (N2));
9501 Set_Global_Type (Parent (N), Parent (N2));
9502 Save_Entity_Descendants (N);
9504 -- If this is a reference to the current generic entity,
9505 -- replace by the name of the generic homonym of the current
9506 -- package. This is because in an instantiation Par.P.Q will
9507 -- not resolve to the name of the instance, whose enclosing
9508 -- scope is not necessarily Par. We use the generic homonym
9509 -- rather that the name of the generic itself, because it may
9510 -- be hidden by a local declaration.
9512 elsif In_Open_Scopes (Entity (Parent (N2)))
9514 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9516 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9517 Rewrite (Parent (N),
9518 Make_Identifier (Sloc (N),
9520 Chars (Generic_Homonym (Entity (Parent (N2))))));
9522 Rewrite (Parent (N),
9523 Make_Identifier (Sloc (N),
9524 Chars => Chars (Selector_Name (Parent (N2)))));
9528 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9529 or else Nkind (Parent (Parent (N)))
9530 = N_Function_Instantiation
9531 or else Nkind (Parent (Parent (N)))
9532 = N_Procedure_Instantiation)
9533 and then Parent (N) = Name (Parent (Parent (N)))
9535 Save_Global_Defaults
9536 (Parent (Parent (N)), Parent (Parent ((N2))));
9539 -- A selected component may denote a static constant that has
9540 -- been folded. Make the same replacement in original tree.
9542 elsif Nkind (Parent (N)) = N_Selected_Component
9543 and then (Nkind (Parent (N2)) = N_Integer_Literal
9544 or else Nkind (Parent (N2)) = N_Real_Literal)
9546 Rewrite (Parent (N),
9547 New_Copy (Parent (N2)));
9548 Set_Analyzed (Parent (N), False);
9550 -- A selected component may be transformed into a parameterless
9551 -- function call. If the called entity is global, rewrite the
9552 -- node appropriately, i.e. as an extended name for the global
9555 elsif Nkind (Parent (N)) = N_Selected_Component
9556 and then Nkind (Parent (N2)) = N_Function_Call
9557 and then Is_Global (Entity (Name (Parent (N2))))
9559 Change_Selected_Component_To_Expanded_Name (Parent (N));
9560 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9561 Set_Global_Type (Parent (N), Name (Parent (N2)));
9562 Save_Entity_Descendants (N);
9565 -- Entity is local. Reset in generic unit, so that node
9566 -- is resolved anew at the point of instantiation.
9568 Set_Associated_Node (N, Empty);
9569 Set_Etype (N, Empty);
9573 -----------------------------
9574 -- Save_Entity_Descendants --
9575 -----------------------------
9577 procedure Save_Entity_Descendants (N : Node_Id) is
9581 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9582 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9585 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9587 when N_Expanded_Name | N_Selected_Component =>
9588 Save_Global_Descendant (Union_Id (Prefix (N)));
9589 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9591 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9595 raise Program_Error;
9597 end Save_Entity_Descendants;
9599 --------------------------
9600 -- Save_Global_Defaults --
9601 --------------------------
9603 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9604 Loc : constant Source_Ptr := Sloc (N1);
9605 Assoc2 : constant List_Id := Generic_Associations (N2);
9606 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9616 Assoc1 := Generic_Associations (N1);
9618 if Present (Assoc1) then
9619 Act1 := First (Assoc1);
9622 Set_Generic_Associations (N1, New_List);
9623 Assoc1 := Generic_Associations (N1);
9626 if Present (Assoc2) then
9627 Act2 := First (Assoc2);
9632 while Present (Act1) and then Present (Act2) loop
9637 -- Find the associations added for default suprograms
9639 if Present (Act2) then
9640 while Nkind (Act2) /= N_Generic_Association
9641 or else No (Entity (Selector_Name (Act2)))
9642 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9647 -- Add a similar association if the default is global. The
9648 -- renaming declaration for the actual has been analyzed, and
9649 -- its alias is the program it renames. Link the actual in the
9650 -- original generic tree with the node in the analyzed tree.
9652 while Present (Act2) loop
9653 Subp := Entity (Selector_Name (Act2));
9654 Def := Explicit_Generic_Actual_Parameter (Act2);
9656 -- Following test is defence against rubbish errors
9658 if No (Alias (Subp)) then
9662 -- Retrieve the resolved actual from the renaming declaration
9663 -- created for the instantiated formal.
9665 Actual := Entity (Name (Parent (Parent (Subp))));
9666 Set_Entity (Def, Actual);
9667 Set_Etype (Def, Etype (Actual));
9669 if Is_Global (Actual) then
9671 Make_Generic_Association (Loc,
9672 Selector_Name => New_Occurrence_Of (Subp, Loc),
9673 Explicit_Generic_Actual_Parameter =>
9674 New_Occurrence_Of (Actual, Loc));
9677 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9679 Append (Ndec, Assoc1);
9681 -- If there are other defaults, add a dummy association
9682 -- in case there are other defaulted formals with the same
9685 elsif Present (Next (Act2)) then
9687 Make_Generic_Association (Loc,
9688 Selector_Name => New_Occurrence_Of (Subp, Loc),
9689 Explicit_Generic_Actual_Parameter => Empty);
9691 Append (Ndec, Assoc1);
9698 if Nkind (Name (N1)) = N_Identifier
9699 and then Is_Child_Unit (Gen_Id)
9700 and then Is_Global (Gen_Id)
9701 and then Is_Generic_Unit (Scope (Gen_Id))
9702 and then In_Open_Scopes (Scope (Gen_Id))
9704 -- This is an instantiation of a child unit within a sibling,
9705 -- so that the generic parent is in scope. An eventual instance
9706 -- must occur within the scope of an instance of the parent.
9707 -- Make name in instance into an expanded name, to preserve the
9708 -- identifier of the parent, so it can be resolved subsequently.
9711 Make_Expanded_Name (Loc,
9712 Chars => Chars (Gen_Id),
9713 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9714 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9715 Set_Entity (Name (N2), Gen_Id);
9718 Make_Expanded_Name (Loc,
9719 Chars => Chars (Gen_Id),
9720 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9721 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9723 Set_Associated_Node (Name (N1), Name (N2));
9724 Set_Associated_Node (Prefix (Name (N1)), Empty);
9726 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9727 Set_Etype (Name (N1), Etype (Gen_Id));
9730 end Save_Global_Defaults;
9732 ----------------------------
9733 -- Save_Global_Descendant --
9734 ----------------------------
9736 procedure Save_Global_Descendant (D : Union_Id) is
9740 if D in Node_Range then
9741 if D = Union_Id (Empty) then
9744 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9745 Save_References (Node_Id (D));
9748 elsif D in List_Range then
9749 if D = Union_Id (No_List)
9750 or else Is_Empty_List (List_Id (D))
9755 N1 := First (List_Id (D));
9756 while Present (N1) loop
9757 Save_References (N1);
9762 -- Element list or other non-node field, nothing to do
9767 end Save_Global_Descendant;
9769 ---------------------
9770 -- Save_References --
9771 ---------------------
9773 -- This is the recursive procedure that does the work, once the
9774 -- enclosing generic scope has been established. We have to treat
9775 -- specially a number of node rewritings that are required by semantic
9776 -- processing and which change the kind of nodes in the generic copy:
9777 -- typically constant-folding, replacing an operator node by a string
9778 -- literal, or a selected component by an expanded name. In each of
9779 -- those cases, the transformation is propagated to the generic unit.
9781 procedure Save_References (N : Node_Id) is
9786 elsif Nkind (N) = N_Character_Literal
9787 or else Nkind (N) = N_Operator_Symbol
9789 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9792 elsif Nkind (N) = N_Operator_Symbol
9793 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9795 Change_Operator_Symbol_To_String_Literal (N);
9798 elsif Nkind (N) in N_Op then
9800 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9802 if Nkind (N) = N_Op_Concat then
9803 Set_Is_Component_Left_Opnd (N,
9804 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9806 Set_Is_Component_Right_Opnd (N,
9807 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9812 -- Node may be transformed into call to a user-defined operator
9814 N2 := Get_Associated_Node (N);
9816 if Nkind (N2) = N_Function_Call then
9817 E := Entity (Name (N2));
9820 and then Is_Global (E)
9822 Set_Etype (N, Etype (N2));
9824 Set_Associated_Node (N, Empty);
9825 Set_Etype (N, Empty);
9828 elsif Nkind (N2) = N_Integer_Literal
9829 or else Nkind (N2) = N_Real_Literal
9830 or else Nkind (N2) = N_String_Literal
9832 -- Operation was constant-folded, perform the same
9833 -- replacement in generic.
9835 Rewrite (N, New_Copy (N2));
9836 Set_Analyzed (N, False);
9838 elsif Nkind (N2) = N_Identifier
9839 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9841 -- Same if call was folded into a literal, but in this
9842 -- case retain the entity to avoid spurious ambiguities
9843 -- if id is overloaded at the point of instantiation or
9846 Rewrite (N, New_Copy (N2));
9847 Set_Analyzed (N, False);
9851 -- Complete the check on operands, if node has not been
9854 if Nkind (N) in N_Op then
9855 Save_Entity_Descendants (N);
9858 elsif Nkind (N) = N_Identifier then
9859 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9861 -- If this is a discriminant reference, always save it.
9862 -- It is used in the instance to find the corresponding
9863 -- discriminant positionally rather than by name.
9865 Set_Original_Discriminant
9866 (N, Original_Discriminant (Get_Associated_Node (N)));
9870 N2 := Get_Associated_Node (N);
9872 if Nkind (N2) = N_Function_Call then
9873 E := Entity (Name (N2));
9875 -- Name resolves to a call to parameterless function.
9876 -- If original entity is global, mark node as resolved.
9879 and then Is_Global (E)
9881 Set_Etype (N, Etype (N2));
9883 Set_Associated_Node (N, Empty);
9884 Set_Etype (N, Empty);
9888 Nkind (N2) = N_Integer_Literal or else
9889 Nkind (N2) = N_Real_Literal or else
9890 Nkind (N2) = N_String_Literal
9892 -- Name resolves to named number that is constant-folded,
9893 -- or to string literal from concatenation.
9894 -- Perform the same replacement in generic.
9896 Rewrite (N, New_Copy (N2));
9897 Set_Analyzed (N, False);
9899 elsif Nkind (N2) = N_Explicit_Dereference then
9901 -- An identifier is rewritten as a dereference if it is
9902 -- the prefix in a selected component, and it denotes an
9903 -- access to a composite type, or a parameterless function
9904 -- call that returns an access type.
9906 -- Check whether corresponding entity in prefix is global
9908 if Is_Entity_Name (Prefix (N2))
9909 and then Present (Entity (Prefix (N2)))
9910 and then Is_Global (Entity (Prefix (N2)))
9913 Make_Explicit_Dereference (Sloc (N),
9914 Prefix => Make_Identifier (Sloc (N),
9915 Chars => Chars (N))));
9916 Set_Associated_Node (Prefix (N), Prefix (N2));
9918 elsif Nkind (Prefix (N2)) = N_Function_Call
9919 and then Is_Global (Entity (Name (Prefix (N2))))
9922 Make_Explicit_Dereference (Sloc (N),
9923 Prefix => Make_Function_Call (Sloc (N),
9925 Make_Identifier (Sloc (N),
9926 Chars => Chars (N)))));
9929 (Name (Prefix (N)), Name (Prefix (N2)));
9932 Set_Associated_Node (N, Empty);
9933 Set_Etype (N, Empty);
9936 -- The subtype mark of a nominally unconstrained object
9937 -- is rewritten as a subtype indication using the bounds
9938 -- of the expression. Recover the original subtype mark.
9940 elsif Nkind (N2) = N_Subtype_Indication
9941 and then Is_Entity_Name (Original_Node (N2))
9943 Set_Associated_Node (N, Original_Node (N2));
9951 elsif Nkind (N) in N_Entity then
9956 use Atree.Unchecked_Access;
9957 -- This code section is part of implementing an untyped tree
9958 -- traversal, so it needs direct access to node fields.
9961 if Nkind (N) = N_Aggregate
9963 Nkind (N) = N_Extension_Aggregate
9965 N2 := Get_Associated_Node (N);
9968 or else No (Etype (N2))
9969 or else not Is_Global (Etype (N2))
9971 Set_Associated_Node (N, Empty);
9974 Save_Global_Descendant (Field1 (N));
9975 Save_Global_Descendant (Field2 (N));
9976 Save_Global_Descendant (Field3 (N));
9977 Save_Global_Descendant (Field5 (N));
9979 -- All other cases than aggregates
9982 Save_Global_Descendant (Field1 (N));
9983 Save_Global_Descendant (Field2 (N));
9984 Save_Global_Descendant (Field3 (N));
9985 Save_Global_Descendant (Field4 (N));
9986 Save_Global_Descendant (Field5 (N));
9990 end Save_References;
9992 -- Start of processing for Save_Global_References
9995 Gen_Scope := Current_Scope;
9997 -- If the generic unit is a child unit, references to entities in
9998 -- the parent are treated as local, because they will be resolved
9999 -- anew in the context of the instance of the parent.
10001 while Is_Child_Unit (Gen_Scope)
10002 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
10004 Gen_Scope := Scope (Gen_Scope);
10007 Save_References (N);
10008 end Save_Global_References;
10010 --------------------------------------
10011 -- Set_Copied_Sloc_For_Inlined_Body --
10012 --------------------------------------
10014 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
10016 Create_Instantiation_Source (N, E, True, S_Adjustment);
10017 end Set_Copied_Sloc_For_Inlined_Body;
10019 ---------------------
10020 -- Set_Instance_Of --
10021 ---------------------
10023 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
10025 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
10026 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
10027 Generic_Renamings.Increment_Last;
10028 end Set_Instance_Of;
10030 --------------------
10031 -- Set_Next_Assoc --
10032 --------------------
10034 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
10036 Generic_Renamings.Table (E).Next_In_HTable := Next;
10037 end Set_Next_Assoc;
10039 -------------------
10040 -- Start_Generic --
10041 -------------------
10043 procedure Start_Generic is
10045 -- ??? I am sure more things could be factored out in this
10046 -- routine. Should probably be done at a later stage.
10048 Generic_Flags.Increment_Last;
10049 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
10050 Inside_A_Generic := True;
10052 Expander_Mode_Save_And_Set (False);
10055 ----------------------
10056 -- Set_Instance_Env --
10057 ----------------------
10059 procedure Set_Instance_Env
10060 (Gen_Unit : Entity_Id;
10061 Act_Unit : Entity_Id)
10065 -- Regardless of the current mode, predefined units are analyzed in
10066 -- the most current Ada mode, and earlier version Ada checks do not
10067 -- apply to predefined units.
10069 if Is_Internal_File_Name
10070 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
10071 Renamings_Included => True) then
10072 Ada_Version := Ada_Version_Type'Last;
10075 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
10076 end Set_Instance_Env;
10082 procedure Switch_View (T : Entity_Id) is
10083 BT : constant Entity_Id := Base_Type (T);
10084 Priv_Elmt : Elmt_Id := No_Elmt;
10085 Priv_Sub : Entity_Id;
10088 -- T may be private but its base type may have been exchanged through
10089 -- some other occurrence, in which case there is nothing to switch.
10091 if not Is_Private_Type (BT) then
10095 Priv_Elmt := First_Elmt (Private_Dependents (BT));
10097 if Present (Full_View (BT)) then
10098 Append_Elmt (Full_View (BT), Exchanged_Views);
10099 Exchange_Declarations (BT);
10102 while Present (Priv_Elmt) loop
10103 Priv_Sub := (Node (Priv_Elmt));
10105 -- We avoid flipping the subtype if the Etype of its full
10106 -- view is private because this would result in a malformed
10107 -- subtype. This occurs when the Etype of the subtype full
10108 -- view is the full view of the base type (and since the
10109 -- base types were just switched, the subtype is pointing
10110 -- to the wrong view). This is currently the case for
10111 -- tagged record types, access types (maybe more?) and
10112 -- needs to be resolved. ???
10114 if Present (Full_View (Priv_Sub))
10115 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10117 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10118 Exchange_Declarations (Priv_Sub);
10121 Next_Elmt (Priv_Elmt);
10125 -----------------------------
10126 -- Valid_Default_Attribute --
10127 -----------------------------
10129 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10130 Attr_Id : constant Attribute_Id :=
10131 Get_Attribute_Id (Attribute_Name (Def));
10132 T : constant Entity_Id := Entity (Prefix (Def));
10133 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10146 F := First_Formal (Nam);
10147 while Present (F) loop
10148 Num_F := Num_F + 1;
10153 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10154 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10155 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10156 Attribute_Unbiased_Rounding =>
10159 and then Is_Floating_Point_Type (T);
10161 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10162 Attribute_Value | Attribute_Wide_Image |
10163 Attribute_Wide_Value =>
10164 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10166 when Attribute_Max | Attribute_Min =>
10167 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10169 when Attribute_Input =>
10170 OK := (Is_Fun and then Num_F = 1);
10172 when Attribute_Output | Attribute_Read | Attribute_Write =>
10173 OK := (not Is_Fun and then Num_F = 2);
10180 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10183 end Valid_Default_Attribute;