1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
11 -- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- GNAT was originally developed by the GNAT team at New York University. --
25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
27 ------------------------------------------------------------------------------
29 with Atree; use Atree;
30 with Einfo; use Einfo;
31 with Elists; use Elists;
32 with Errout; use Errout;
33 with Expander; use Expander;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
36 with Freeze; use Freeze;
38 with Inline; use Inline;
40 with Lib.Load; use Lib.Load;
41 with Lib.Xref; use Lib.Xref;
42 with Nlists; use Nlists;
43 with Nmake; use Nmake;
45 with Restrict; use Restrict;
46 with Rtsfind; use Rtsfind;
48 with Sem_Cat; use Sem_Cat;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Ch10; use Sem_Ch10;
54 with Sem_Ch13; use Sem_Ch13;
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 Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation (N : Node_Id);
245 pragma No_Return (Abandon_Instantiation);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T : in out Entity_Id;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part (N : Node_Id);
283 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
284 -- This needs comments ???
286 function Analyze_Associations
291 -- At instantiation time, build the list of associations between formals
292 -- and actuals. Each association becomes a renaming declaration for the
293 -- formal entity. F_Copy is the analyzed list of formals in the generic
294 -- copy. It is used to apply legality checks to the actuals. I_Node is the
295 -- instantiation node itself.
297 procedure Analyze_Subprogram_Instantiation
301 procedure Build_Instance_Compilation_Unit_Nodes
305 -- This procedure is used in the case where the generic instance of a
306 -- subprogram body or package body is a library unit. In this case, the
307 -- original library unit node for the generic instantiation must be
308 -- replaced by the resulting generic body, and a link made to a new
309 -- compilation unit node for the generic declaration. The argument N is
310 -- the original generic instantiation. Act_Body and Act_Decl are the body
311 -- and declaration of the instance (either package body and declaration
312 -- nodes or subprogram body and declaration nodes depending on the case).
313 -- On return, the node N has been rewritten with the actual body.
315 procedure Check_Formal_Packages (P_Id : Entity_Id);
316 -- Apply the following to all formal packages in generic associations.
318 procedure Check_Formal_Package_Instance
319 (Formal_Pack : Entity_Id;
320 Actual_Pack : Entity_Id);
321 -- Verify that the actuals of the actual instance match the actuals of
322 -- the template for a formal package that is not declared with a box.
324 procedure Check_Forward_Instantiation (Decl : Node_Id);
325 -- If the generic is a local entity and the corresponding body has not
326 -- been seen yet, flag enclosing packages to indicate that it will be
327 -- elaborated after the generic body. Subprograms declared in the same
328 -- package cannot be inlined by the front-end because front-end inlining
329 -- requires a strict linear order of elaboration.
331 procedure Check_Hidden_Child_Unit
333 Gen_Unit : Entity_Id;
334 Act_Decl_Id : Entity_Id);
335 -- If the generic unit is an implicit child instance within a parent
336 -- instance, we need to make an explicit test that it is not hidden by
337 -- a child instance of the same name and parent.
339 procedure Check_Private_View (N : Node_Id);
340 -- Check whether the type of a generic entity has a different view between
341 -- the point of generic analysis and the point of instantiation. If the
342 -- view has changed, then at the point of instantiation we restore the
343 -- correct view to perform semantic analysis of the instance, and reset
344 -- the current view after instantiation. The processing is driven by the
345 -- current private status of the type of the node, and Has_Private_View,
346 -- a flag that is set at the point of generic compilation. If view and
347 -- flag are inconsistent then the type is updated appropriately.
349 procedure Check_Generic_Actuals
350 (Instance : Entity_Id;
351 Is_Formal_Box : Boolean);
352 -- Similar to previous one. Check the actuals in the instantiation,
353 -- whose views can change between the point of instantiation and the point
354 -- of instantiation of the body. In addition, mark the generic renamings
355 -- as generic actuals, so that they are not compatible with other actuals.
356 -- Recurse on an actual that is a formal package whose declaration has
359 function Contains_Instance_Of
364 -- Inner is instantiated within the generic Outer. Check whether Inner
365 -- directly or indirectly contains an instance of Outer or of one of its
366 -- parents, in the case of a subunit. Each generic unit holds a list of
367 -- the entities instantiated within (at any depth). This procedure
368 -- determines whether the set of such lists contains a cycle, i.e. an
369 -- illegal circular instantiation.
371 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. Used in
374 -- Restore_Private_Views, to keep the formals of such a package visible
375 -- on exit from an inner instantiation.
377 function Find_Actual_Type
379 Gen_Scope : Entity_Id)
381 -- When validating the actual types of a child instance, check whether
382 -- the formal is a formal type of the parent unit, and retrieve the current
383 -- actual for it. Typ is the entity in the analyzed formal type declaration
384 -- (component or index type of an array type) and Gen_Scope is the scope of
385 -- the analyzed formal array type.
387 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
388 -- Given the entity of a unit that is an instantiation, retrieve the
389 -- original instance node. This is used when loading the instantiations
390 -- of the ancestors of a child generic that is being instantiated.
392 function In_Same_Declarative_Part
396 -- True if the instantiation Inst and the given freeze_node F_Node appear
397 -- within the same declarative part, ignoring subunits, but with no inter-
398 -- vening suprograms or concurrent units. If true, the freeze node
399 -- of the instance can be placed after the freeze node of the parent,
400 -- which it itself an instance.
402 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
403 -- Associate analyzed generic parameter with corresponding
404 -- instance. Used for semantic checks at instantiation time.
406 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
407 -- Traverse the Exchanged_Views list to see if a type was private
408 -- and has already been flipped during this phase of instantiation.
410 procedure Hide_Current_Scope;
411 -- When compiling a generic child unit, the parent context must be
412 -- present, but the instance and all entities that may be generated
413 -- must be inserted in the current scope. We leave the current scope
414 -- on the stack, but make its entities invisible to avoid visibility
415 -- problems. This is reversed at the end of instantiations. This is
416 -- not done for the instantiation of the bodies, which only require the
417 -- instances of the generic parents to be in scope.
419 procedure Install_Body
424 -- If the instantiation happens textually before the body of the generic,
425 -- the instantiation of the body must be analyzed after the generic body,
426 -- and not at the point of instantiation. Such early instantiations can
427 -- happen if the generic and the instance appear in a package declaration
428 -- because the generic body can only appear in the corresponding package
429 -- body. Early instantiations can also appear if generic, instance and
430 -- body are all in the declarative part of a subprogram or entry. Entities
431 -- of packages that are early instantiations are delayed, and their freeze
432 -- node appears after the generic body.
434 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
435 -- Insert freeze node at the end of the declarative part that includes the
436 -- instance node N. If N is in the visible part of an enclosing package
437 -- declaration, the freeze node has to be inserted at the end of the
438 -- private declarations, if any.
440 procedure Freeze_Subprogram_Body
441 (Inst_Node : Node_Id;
443 Pack_Id : Entity_Id);
444 -- The generic body may appear textually after the instance, including
445 -- in the proper body of a stub, or within a different package instance.
446 -- Given that the instance can only be elaborated after the generic, we
447 -- place freeze_nodes for the instance and/or for packages that may enclose
448 -- the instance and the generic, so that the back-end can establish the
449 -- proper order of elaboration.
451 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
452 -- When compiling an instance of a child unit the parent (which is
453 -- itself an instance) is an enclosing scope that must be made
454 -- immediately visible. This procedure is also used to install the non-
455 -- generic parent of a generic child unit when compiling its body, so that
456 -- full views of types in the parent are made visible.
458 procedure Remove_Parent (In_Body : Boolean := False);
459 -- Reverse effect after instantiation of child is complete.
461 procedure Inline_Instance_Body
463 Gen_Unit : Entity_Id;
465 -- If front-end inlining is requested, instantiate the package body,
466 -- and preserve the visibility of its compilation unit, to insure
467 -- that successive instantiations succeed.
469 -- The functions Instantiate_XXX perform various legality checks and build
470 -- the declarations for instantiated generic parameters.
471 -- Need to describe what the parameters are ???
473 function Instantiate_Object
476 Analyzed_Formal : Node_Id)
479 function Instantiate_Type
482 Analyzed_Formal : Node_Id)
485 function Instantiate_Formal_Subprogram
488 Analyzed_Formal : Node_Id)
491 function Instantiate_Formal_Package
494 Analyzed_Formal : Node_Id)
496 -- If the formal package is declared with a box, special visibility rules
497 -- apply to its formals: they are in the visible part of the package. This
498 -- is true in the declarative region of the formal package, that is to say
499 -- in the enclosing generic or instantiation. For an instantiation, the
500 -- parameters of the formal package are made visible in an explicit step.
501 -- Furthermore, if the actual is a visible use_clause, these formals must
502 -- be made potentially use_visible as well. On exit from the enclosing
503 -- instantiation, the reverse must be done.
505 -- For a formal package declared without a box, there are conformance rules
506 -- that apply to the actuals in the generic declaration and the actuals of
507 -- the actual package in the enclosing instantiation. The simplest way to
508 -- apply these rules is to repeat the instantiation of the formal package
509 -- in the context of the enclosing instance, and compare the generic
510 -- associations of this instantiation with those of the actual package.
512 function Is_In_Main_Unit (N : Node_Id) return Boolean;
513 -- Test if given node is in the main unit
515 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
516 -- If the generic appears in a separate non-generic library unit,
517 -- load the corresponding body to retrieve the body of the generic.
518 -- N is the node for the generic instantiation, Spec is the generic
519 -- package declaration.
521 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
522 -- Add the context clause of the unit containing a generic unit to
523 -- an instantiation that is a compilation unit.
525 function Get_Associated_Node (N : Node_Id) return Node_Id;
526 -- In order to propagate semantic information back from the analyzed
527 -- copy to the original generic, we maintain links between selected nodes
528 -- in the generic and their corresponding copies. At the end of generic
529 -- analysis, the routine Save_Global_References traverses the generic
530 -- tree, examines the semantic information, and preserves the links to
531 -- those nodes that contain global information. At instantiation, the
532 -- information from the associated node is placed on the new copy, so
533 -- that name resolution is not repeated.
535 -- Three kinds of source nodes have associated nodes:
537 -- a) those that can reference (denote) entities, that is identifiers,
538 -- character literals, expanded_names, operator symbols, operators,
539 -- and attribute reference nodes. These nodes have an Entity field
540 -- and are the set of nodes that are in N_Has_Entity.
542 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
544 -- c) selected components (N_Selected_Component)
546 -- For the first class, the associated node preserves the entity if it is
547 -- global. If the generic contains nested instantiations, the associated_
548 -- node itself has been recopied, and a chain of them must be followed.
550 -- For aggregates, the associated node allows retrieval of the type, which
551 -- may otherwise not appear in the generic. The view of this type may be
552 -- different between generic and instantiation, and the full view can be
553 -- installed before the instantiation is analyzed. For aggregates of
554 -- type extensions, the same view exchange may have to be performed for
555 -- some of the ancestor types, if their view is private at the point of
558 -- Nodes that are selected components in the parse tree may be rewritten
559 -- as expanded names after resolution, and must be treated as potential
560 -- entity holders. which is why they also have an Associated_Node.
562 -- Nodes that do not come from source, such as freeze nodes, do not appear
563 -- in the generic tree, and need not have an associated node.
565 -- The associated node is stored in the Associated_Node field. Note that
566 -- this field overlaps Entity, which is fine, because the whole point is
567 -- that we don't need or want the normal Entity field in this situation.
569 procedure Move_Freeze_Nodes
573 -- Freeze nodes can be generated in the analysis of a generic unit, but
574 -- will not be seen by the back-end. It is necessary to move those nodes
575 -- to the enclosing scope if they freeze an outer entity. We place them
576 -- at the end of the enclosing generic package, which is semantically
579 procedure Pre_Analyze_Actuals (N : Node_Id);
580 -- Analyze actuals to perform name resolution. Full resolution is done
581 -- later, when the expected types are known, but names have to be captured
582 -- before installing parents of generics, that are not visible for the
583 -- actuals themselves.
585 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
586 -- Verify that an attribute that appears as the default for a formal
587 -- subprogram is a function or procedure with the correct profile.
589 -------------------------------------------
590 -- Data Structures for Generic Renamings --
591 -------------------------------------------
593 -- The map Generic_Renamings associates generic entities with their
594 -- corresponding actuals. Currently used to validate type instances.
595 -- It will eventually be used for all generic parameters to eliminate
596 -- the need for overload resolution in the instance.
598 type Assoc_Ptr is new Int;
600 Assoc_Null : constant Assoc_Ptr := -1;
605 Next_In_HTable : Assoc_Ptr;
608 package Generic_Renamings is new Table.Table
609 (Table_Component_Type => Assoc,
610 Table_Index_Type => Assoc_Ptr,
611 Table_Low_Bound => 0,
613 Table_Increment => 100,
614 Table_Name => "Generic_Renamings");
616 -- Variable to hold enclosing instantiation. When the environment is
617 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
619 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
621 -- Hash table for associations
623 HTable_Size : constant := 37;
624 type HTable_Range is range 0 .. HTable_Size - 1;
626 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
627 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
628 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
629 function Hash (F : Entity_Id) return HTable_Range;
631 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
632 Header_Num => HTable_Range,
634 Elmt_Ptr => Assoc_Ptr,
635 Null_Ptr => Assoc_Null,
636 Set_Next => Set_Next_Assoc,
639 Get_Key => Get_Gen_Id,
643 Exchanged_Views : Elist_Id;
644 -- This list holds the private views that have been exchanged during
645 -- instantiation to restore the visibility of the generic declaration.
646 -- (see comments above). After instantiation, the current visibility is
647 -- reestablished by means of a traversal of this list.
649 Hidden_Entities : Elist_Id;
650 -- This list holds the entities of the current scope that are removed
651 -- from immediate visibility when instantiating a child unit. Their
652 -- visibility is restored in Remove_Parent.
654 -- Because instantiations can be recursive, the following must be saved
655 -- on entry and restored on exit from an instantiation (spec or body).
656 -- This is done by the two procedures Save_Env and Restore_Env.
658 type Instance_Env is record
660 Instantiated_Parent : Assoc;
661 Exchanged_Views : Elist_Id;
662 Hidden_Entities : Elist_Id;
663 Current_Sem_Unit : Unit_Number_Type;
666 package Instance_Envs is new Table.Table (
667 Table_Component_Type => Instance_Env,
668 Table_Index_Type => Int,
669 Table_Low_Bound => 0,
671 Table_Increment => 100,
672 Table_Name => "Instance_Envs");
674 procedure Restore_Private_Views
675 (Pack_Id : Entity_Id;
676 Is_Package : Boolean := True);
677 -- Restore the private views of external types, and unmark the generic
678 -- renamings of actuals, so that they become comptible subtypes again.
679 -- For subprograms, Pack_Id is the package constructed to hold the
682 procedure Switch_View (T : Entity_Id);
683 -- Switch the partial and full views of a type and its private
684 -- dependents (i.e. its subtypes and derived types).
686 ------------------------------------
687 -- Structures for Error Reporting --
688 ------------------------------------
690 Instantiation_Node : Node_Id;
691 -- Used by subprograms that validate instantiation of formal parameters
692 -- where there might be no actual on which to place the error message.
693 -- Also used to locate the instantiation node for generic subunits.
695 Instantiation_Error : exception;
696 -- When there is a semantic error in the generic parameter matching,
697 -- there is no point in continuing the instantiation, because the
698 -- number of cascaded errors is unpredictable. This exception aborts
699 -- the instantiation process altogether.
701 S_Adjustment : Sloc_Adjustment;
702 -- Offset created for each node in an instantiation, in order to keep
703 -- track of the source position of the instantiation in each of its nodes.
704 -- A subsequent semantic error or warning on a construct of the instance
705 -- points to both places: the original generic node, and the point of
706 -- instantiation. See Sinput and Sinput.L for additional details.
708 ------------------------------------------------------------
709 -- Data structure for keeping track when inside a Generic --
710 ------------------------------------------------------------
712 -- The following table is used to save values of the Inside_A_Generic
713 -- flag (see spec of Sem) when they are saved by Start_Generic.
715 package Generic_Flags is new Table.Table (
716 Table_Component_Type => Boolean,
717 Table_Index_Type => Int,
718 Table_Low_Bound => 0,
720 Table_Increment => 200,
721 Table_Name => "Generic_Flags");
723 ---------------------------
724 -- Abandon_Instantiation --
725 ---------------------------
727 procedure Abandon_Instantiation (N : Node_Id) is
729 Error_Msg_N ("instantiation abandoned!", N);
730 raise Instantiation_Error;
731 end Abandon_Instantiation;
733 --------------------------
734 -- Analyze_Associations --
735 --------------------------
737 function Analyze_Associations
743 Actuals : List_Id := Generic_Associations (I_Node);
745 Actual_Types : Elist_Id := New_Elmt_List;
746 Assoc : List_Id := New_List;
748 Next_Formal : Node_Id;
749 Temp_Formal : Node_Id;
750 Analyzed_Formal : Node_Id;
751 Defaults : Elist_Id := New_Elmt_List;
754 First_Named : Node_Id := Empty;
755 Found_Assoc : Node_Id;
756 Is_Named_Assoc : Boolean;
757 Num_Matched : Int := 0;
758 Num_Actuals : Int := 0;
760 function Matching_Actual
764 -- Find actual that corresponds to a given a formal parameter. If the
765 -- actuals are positional, return the next one, if any. If the actuals
766 -- are named, scan the parameter associations to find the right one.
767 -- A_F is the corresponding entity in the analyzed generic,which is
768 -- placed on the selector name for ASIS use.
770 procedure Set_Analyzed_Formal;
771 -- Find the node in the generic copy that corresponds to a given formal.
772 -- The semantic information on this node is used to perform legality
773 -- checks on the actuals. Because semantic analysis can introduce some
774 -- anonymous entities or modify the declaration node itself, the
775 -- correspondence between the two lists is not one-one. In addition to
776 -- anonymous types, the presence a formal equality will introduce an
777 -- implicit declaration for the corresponding inequality.
779 ---------------------
780 -- Matching_Actual --
781 ---------------------
783 function Matching_Actual
792 Is_Named_Assoc := False;
794 -- End of list of purely positional parameters
799 -- Case of positional parameter corresponding to current formal
801 elsif No (Selector_Name (Actual)) then
802 Found := Explicit_Generic_Actual_Parameter (Actual);
803 Found_Assoc := Actual;
804 Num_Matched := Num_Matched + 1;
807 -- Otherwise scan list of named actuals to find the one with the
808 -- desired name. All remaining actuals have explicit names.
811 Is_Named_Assoc := True;
815 while Present (Actual) loop
816 if Chars (Selector_Name (Actual)) = Chars (F) then
817 Found := Explicit_Generic_Actual_Parameter (Actual);
818 Set_Entity (Selector_Name (Actual), A_F);
819 Set_Etype (Selector_Name (Actual), Etype (A_F));
820 Found_Assoc := Actual;
821 Num_Matched := Num_Matched + 1;
829 -- Reset for subsequent searches. In most cases the named
830 -- associations are in order. If they are not, we reorder them
831 -- to avoid scanning twice the same actual. This is not just a
832 -- question of efficiency: there may be multiple defaults with
833 -- boxes that have the same name. In a nested instantiation we
834 -- insert actuals for those defaults, and cannot rely on their
835 -- names to disambiguate them.
837 if Actual = First_Named then
840 elsif Present (Actual) then
841 Insert_Before (First_Named, Remove_Next (Prev));
844 Actual := First_Named;
850 -------------------------
851 -- Set_Analyzed_Formal --
852 -------------------------
854 procedure Set_Analyzed_Formal is
857 while Present (Analyzed_Formal) loop
858 Kind := Nkind (Analyzed_Formal);
860 case Nkind (Formal) is
862 when N_Formal_Subprogram_Declaration =>
863 exit when Kind = N_Formal_Subprogram_Declaration
866 (Defining_Unit_Name (Specification (Formal))) =
868 (Defining_Unit_Name (Specification (Analyzed_Formal)));
870 when N_Formal_Package_Declaration =>
872 Kind = N_Formal_Package_Declaration
874 Kind = N_Generic_Package_Declaration;
876 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
880 -- Skip freeze nodes, and nodes inserted to replace
881 -- unrecognized pragmas.
884 Kind /= N_Formal_Subprogram_Declaration
885 and then Kind /= N_Subprogram_Declaration
886 and then Kind /= N_Freeze_Entity
887 and then Kind /= N_Null_Statement
888 and then Kind /= N_Itype_Reference
889 and then Chars (Defining_Identifier (Formal)) =
890 Chars (Defining_Identifier (Analyzed_Formal));
893 Next (Analyzed_Formal);
896 end Set_Analyzed_Formal;
898 -- Start of processing for Analyze_Associations
901 -- If named associations are present, save the first named association
902 -- (it may of course be Empty) to facilitate subsequent name search.
904 if Present (Actuals) then
905 First_Named := First (Actuals);
907 while Present (First_Named)
908 and then No (Selector_Name (First_Named))
910 Num_Actuals := Num_Actuals + 1;
915 Named := First_Named;
916 while Present (Named) loop
917 if No (Selector_Name (Named)) then
918 Error_Msg_N ("invalid positional actual after named one", Named);
919 Abandon_Instantiation (Named);
922 Num_Actuals := Num_Actuals + 1;
926 if Present (Formals) then
927 Formal := First_Non_Pragma (Formals);
928 Analyzed_Formal := First_Non_Pragma (F_Copy);
930 if Present (Actuals) then
931 Actual := First (Actuals);
933 -- All formals should have default values
939 while Present (Formal) loop
941 Next_Formal := Next_Non_Pragma (Formal);
943 case Nkind (Formal) is
944 when N_Formal_Object_Declaration =>
947 Defining_Identifier (Formal),
948 Defining_Identifier (Analyzed_Formal));
951 (Instantiate_Object (Formal, Match, Analyzed_Formal),
954 when N_Formal_Type_Declaration =>
957 Defining_Identifier (Formal),
958 Defining_Identifier (Analyzed_Formal));
961 Error_Msg_NE ("missing actual for instantiation of &",
962 Instantiation_Node, Defining_Identifier (Formal));
963 Abandon_Instantiation (Instantiation_Node);
968 Instantiate_Type (Formal, Match, Analyzed_Formal));
970 -- an instantiation is a freeze point for the actuals,
971 -- unless this is a rewritten formal package.
973 if Nkind (I_Node) /= N_Formal_Package_Declaration then
974 Append_Elmt (Entity (Match), Actual_Types);
978 -- A remote access-to-class-wide type must not be an
979 -- actual parameter for a generic formal of an access
980 -- type (E.2.2 (17)).
982 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
984 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
985 N_Access_To_Object_Definition
987 Validate_Remote_Access_To_Class_Wide_Type (Match);
990 when N_Formal_Subprogram_Declaration =>
993 Defining_Unit_Name (Specification (Formal)),
994 Defining_Unit_Name (Specification (Analyzed_Formal)));
996 -- If the formal subprogram has the same name as
997 -- another formal subprogram of the generic, then
998 -- a named association is illegal (12.3(9)). Exclude
999 -- named associations that are generated for a nested
1003 and then Is_Named_Assoc
1004 and then Comes_From_Source (Found_Assoc)
1006 Temp_Formal := First (Formals);
1007 while Present (Temp_Formal) loop
1008 if Nkind (Temp_Formal) =
1009 N_Formal_Subprogram_Declaration
1010 and then Temp_Formal /= Formal
1012 Chars (Selector_Name (Found_Assoc)) =
1013 Chars (Defining_Unit_Name
1014 (Specification (Temp_Formal)))
1017 ("name not allowed for overloaded formal",
1019 Abandon_Instantiation (Instantiation_Node);
1027 Instantiate_Formal_Subprogram
1028 (Formal, Match, Analyzed_Formal));
1031 and then Box_Present (Formal)
1034 (Defining_Unit_Name (Specification (Last (Assoc))),
1038 when N_Formal_Package_Declaration =>
1041 Defining_Identifier (Formal),
1042 Defining_Identifier (Original_Node (Analyzed_Formal)));
1046 ("missing actual for instantiation of&",
1048 Defining_Identifier (Formal));
1050 Abandon_Instantiation (Instantiation_Node);
1055 (Instantiate_Formal_Package
1056 (Formal, Match, Analyzed_Formal),
1060 -- For use type and use package appearing in the context
1061 -- clause, we have already copied them, so we can just
1062 -- move them where they belong (we mustn't recopy them
1063 -- since this would mess up the Sloc values).
1065 when N_Use_Package_Clause |
1066 N_Use_Type_Clause =>
1068 Append (Formal, Assoc);
1071 raise Program_Error;
1075 Formal := Next_Formal;
1076 Next_Non_Pragma (Analyzed_Formal);
1079 if Num_Actuals > Num_Matched then
1081 ("unmatched actuals in instantiation", Instantiation_Node);
1084 elsif Present (Actuals) then
1086 ("too many actuals in generic instantiation", Instantiation_Node);
1090 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1093 while Present (Elmt) loop
1094 Freeze_Before (I_Node, Node (Elmt));
1099 -- If there are default subprograms, normalize the tree by adding
1100 -- explicit associations for them. This is required if the instance
1101 -- appears within a generic.
1109 Elmt := First_Elmt (Defaults);
1110 while Present (Elmt) loop
1111 if No (Actuals) then
1112 Actuals := New_List;
1113 Set_Generic_Associations (I_Node, Actuals);
1116 Subp := Node (Elmt);
1118 Make_Generic_Association (Sloc (Subp),
1119 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1120 Explicit_Generic_Actual_Parameter =>
1121 New_Occurrence_Of (Subp, Sloc (Subp)));
1122 Mark_Rewrite_Insertion (New_D);
1123 Append_To (Actuals, New_D);
1129 end Analyze_Associations;
1131 -------------------------------
1132 -- Analyze_Formal_Array_Type --
1133 -------------------------------
1135 procedure Analyze_Formal_Array_Type
1136 (T : in out Entity_Id;
1142 -- Treated like a non-generic array declaration, with
1143 -- additional semantic checks.
1147 if Nkind (Def) = N_Constrained_Array_Definition then
1148 DSS := First (Discrete_Subtype_Definitions (Def));
1149 while Present (DSS) loop
1150 if Nkind (DSS) = N_Subtype_Indication
1151 or else Nkind (DSS) = N_Range
1152 or else Nkind (DSS) = N_Attribute_Reference
1154 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1161 Array_Type_Declaration (T, Def);
1162 Set_Is_Generic_Type (Base_Type (T));
1164 if Ekind (Component_Type (T)) = E_Incomplete_Type
1165 and then No (Full_View (Component_Type (T)))
1167 Error_Msg_N ("premature usage of incomplete type", Def);
1169 elsif Is_Internal (Component_Type (T))
1170 and then Nkind (Original_Node (Subtype_Indication (Def)))
1171 /= N_Attribute_Reference
1174 ("only a subtype mark is allowed in a formal",
1175 Subtype_Indication (Def));
1178 end Analyze_Formal_Array_Type;
1180 ---------------------------------------------
1181 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1182 ---------------------------------------------
1184 -- As for other generic types, we create a valid type representation
1185 -- with legal but arbitrary attributes, whose values are never considered
1186 -- static. For all scalar types we introduce an anonymous base type, with
1187 -- the same attributes. We choose the corresponding integer type to be
1188 -- Standard_Integer.
1190 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1194 Loc : constant Source_Ptr := Sloc (Def);
1195 Base : constant Entity_Id :=
1197 (E_Decimal_Fixed_Point_Type,
1198 Current_Scope, Sloc (Def), 'G');
1199 Int_Base : constant Entity_Id := Standard_Integer;
1200 Delta_Val : constant Ureal := Ureal_1;
1201 Digs_Val : constant Uint := Uint_6;
1206 Set_Etype (Base, Base);
1207 Set_Size_Info (Base, Int_Base);
1208 Set_RM_Size (Base, RM_Size (Int_Base));
1209 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1210 Set_Digits_Value (Base, Digs_Val);
1211 Set_Delta_Value (Base, Delta_Val);
1212 Set_Small_Value (Base, Delta_Val);
1213 Set_Scalar_Range (Base,
1215 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1216 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1218 Set_Is_Generic_Type (Base);
1219 Set_Parent (Base, Parent (Def));
1221 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1222 Set_Etype (T, Base);
1223 Set_Size_Info (T, Int_Base);
1224 Set_RM_Size (T, RM_Size (Int_Base));
1225 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1226 Set_Digits_Value (T, Digs_Val);
1227 Set_Delta_Value (T, Delta_Val);
1228 Set_Small_Value (T, Delta_Val);
1229 Set_Scalar_Range (T, Scalar_Range (Base));
1231 Check_Restriction (No_Fixed_Point, Def);
1232 end Analyze_Formal_Decimal_Fixed_Point_Type;
1234 ---------------------------------
1235 -- Analyze_Formal_Derived_Type --
1236 ---------------------------------
1238 procedure Analyze_Formal_Derived_Type
1243 Loc : constant Source_Ptr := Sloc (Def);
1245 Unk_Disc : Boolean := Unknown_Discriminants_Present (N);
1248 Set_Is_Generic_Type (T);
1250 if Private_Present (Def) then
1252 Make_Private_Extension_Declaration (Loc,
1253 Defining_Identifier => T,
1254 Discriminant_Specifications => Discriminant_Specifications (N),
1255 Unknown_Discriminants_Present => Unk_Disc,
1256 Subtype_Indication => Subtype_Mark (Def));
1258 Set_Abstract_Present (New_N, Abstract_Present (Def));
1262 Make_Full_Type_Declaration (Loc,
1263 Defining_Identifier => T,
1264 Discriminant_Specifications =>
1265 Discriminant_Specifications (Parent (T)),
1267 Make_Derived_Type_Definition (Loc,
1268 Subtype_Indication => Subtype_Mark (Def)));
1270 Set_Abstract_Present
1271 (Type_Definition (New_N), Abstract_Present (Def));
1278 if not Is_Composite_Type (T) then
1280 ("unknown discriminants not allowed for elementary types", N);
1282 Set_Has_Unknown_Discriminants (T);
1283 Set_Is_Constrained (T, False);
1287 -- If the parent type has a known size, so does the formal, which
1288 -- makes legal representation clauses that involve the formal.
1290 Set_Size_Known_At_Compile_Time
1291 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1293 end Analyze_Formal_Derived_Type;
1295 ----------------------------------
1296 -- Analyze_Formal_Discrete_Type --
1297 ----------------------------------
1299 -- The operations defined for a discrete types are those of an
1300 -- enumeration type. The size is set to an arbitrary value, for use
1301 -- in analyzing the generic unit.
1303 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1304 Loc : constant Source_Ptr := Sloc (Def);
1310 Set_Ekind (T, E_Enumeration_Type);
1315 -- For semantic analysis, the bounds of the type must be set to some
1316 -- non-static value. The simplest is to create attribute nodes for
1317 -- those bounds, that refer to the type itself. These bounds are never
1318 -- analyzed but serve as place-holders.
1321 Make_Attribute_Reference (Loc,
1322 Attribute_Name => Name_First,
1323 Prefix => New_Reference_To (T, Loc));
1327 Make_Attribute_Reference (Loc,
1328 Attribute_Name => Name_Last,
1329 Prefix => New_Reference_To (T, Loc));
1332 Set_Scalar_Range (T,
1337 end Analyze_Formal_Discrete_Type;
1339 ----------------------------------
1340 -- Analyze_Formal_Floating_Type --
1341 ---------------------------------
1343 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1344 Base : constant Entity_Id :=
1346 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1349 -- The various semantic attributes are taken from the predefined type
1350 -- Float, just so that all of them are initialized. Their values are
1351 -- never used because no constant folding or expansion takes place in
1352 -- the generic itself.
1355 Set_Ekind (T, E_Floating_Point_Subtype);
1356 Set_Etype (T, Base);
1357 Set_Size_Info (T, (Standard_Float));
1358 Set_RM_Size (T, RM_Size (Standard_Float));
1359 Set_Digits_Value (T, Digits_Value (Standard_Float));
1360 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1362 Set_Is_Generic_Type (Base);
1363 Set_Etype (Base, Base);
1364 Set_Size_Info (Base, (Standard_Float));
1365 Set_RM_Size (Base, RM_Size (Standard_Float));
1366 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1367 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1368 Set_Parent (Base, Parent (Def));
1370 Check_Restriction (No_Floating_Point, Def);
1371 end Analyze_Formal_Floating_Type;
1373 ---------------------------------
1374 -- Analyze_Formal_Modular_Type --
1375 ---------------------------------
1377 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1379 -- Apart from their entity kind, generic modular types are treated
1380 -- like signed integer types, and have the same attributes.
1382 Analyze_Formal_Signed_Integer_Type (T, Def);
1383 Set_Ekind (T, E_Modular_Integer_Subtype);
1384 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1386 end Analyze_Formal_Modular_Type;
1388 ---------------------------------------
1389 -- Analyze_Formal_Object_Declaration --
1390 ---------------------------------------
1392 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1393 E : constant Node_Id := Expression (N);
1394 Id : Node_Id := Defining_Identifier (N);
1401 -- Determine the mode of the formal object
1403 if Out_Present (N) then
1404 K := E_Generic_In_Out_Parameter;
1406 if not In_Present (N) then
1407 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1411 K := E_Generic_In_Parameter;
1414 Find_Type (Subtype_Mark (N));
1415 T := Entity (Subtype_Mark (N));
1417 if Ekind (T) = E_Incomplete_Type then
1418 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1421 if K = E_Generic_In_Parameter then
1422 if Is_Limited_Type (T) then
1424 ("generic formal of mode IN must not be of limited type", N);
1427 if Is_Abstract (T) then
1429 ("generic formal of mode IN must not be of abstract type", N);
1433 Analyze_Default_Expression (E, T);
1439 -- Case of generic IN OUT parameter.
1442 -- If the formal has an unconstrained type, construct its
1443 -- actual subtype, as is done for subprogram formals. In this
1444 -- fashion, all its uses can refer to specific bounds.
1449 if (Is_Array_Type (T)
1450 and then not Is_Constrained (T))
1452 (Ekind (T) = E_Record_Type
1453 and then Has_Discriminants (T))
1456 Non_Freezing_Ref : constant Node_Id :=
1457 New_Reference_To (Id, Sloc (Id));
1461 -- Make sure that the actual subtype doesn't generate
1464 Set_Must_Not_Freeze (Non_Freezing_Ref);
1465 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1466 Insert_Before_And_Analyze (N, Decl);
1467 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1470 Set_Actual_Subtype (Id, T);
1475 ("initialization not allowed for `IN OUT` formals", N);
1479 end Analyze_Formal_Object_Declaration;
1481 ----------------------------------------------
1482 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1483 ----------------------------------------------
1485 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1489 Loc : constant Source_Ptr := Sloc (Def);
1490 Base : constant Entity_Id :=
1492 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1494 -- The semantic attributes are set for completeness only, their
1495 -- values will never be used, because all properties of the type
1499 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1500 Set_Etype (T, Base);
1501 Set_Size_Info (T, Standard_Integer);
1502 Set_RM_Size (T, RM_Size (Standard_Integer));
1503 Set_Small_Value (T, Ureal_1);
1504 Set_Delta_Value (T, Ureal_1);
1505 Set_Scalar_Range (T,
1507 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1508 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1510 Set_Is_Generic_Type (Base);
1511 Set_Etype (Base, Base);
1512 Set_Size_Info (Base, Standard_Integer);
1513 Set_RM_Size (Base, RM_Size (Standard_Integer));
1514 Set_Small_Value (Base, Ureal_1);
1515 Set_Delta_Value (Base, Ureal_1);
1516 Set_Scalar_Range (Base, Scalar_Range (T));
1517 Set_Parent (Base, Parent (Def));
1519 Check_Restriction (No_Fixed_Point, Def);
1520 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1522 ----------------------------
1523 -- Analyze_Formal_Package --
1524 ----------------------------
1526 procedure Analyze_Formal_Package (N : Node_Id) is
1527 Loc : constant Source_Ptr := Sloc (N);
1528 Formal : Entity_Id := Defining_Identifier (N);
1529 Gen_Id : constant Node_Id := Name (N);
1531 Gen_Unit : Entity_Id;
1533 Parent_Installed : Boolean := False;
1535 Parent_Instance : Entity_Id;
1536 Renaming_In_Par : Entity_Id;
1539 Text_IO_Kludge (Gen_Id);
1541 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1542 Gen_Unit := Entity (Gen_Id);
1544 if Ekind (Gen_Unit) /= E_Generic_Package then
1545 Error_Msg_N ("expect generic package name", Gen_Id);
1548 elsif Gen_Unit = Current_Scope then
1550 ("generic package cannot be used as a formal package of itself",
1555 -- Check for a formal package that is a package renaming.
1557 if Present (Renamed_Object (Gen_Unit)) then
1558 Gen_Unit := Renamed_Object (Gen_Unit);
1561 -- The formal package is treated like a regular instance, but only
1562 -- the specification needs to be instantiated, to make entities visible.
1564 if not Box_Present (N) then
1565 Hidden_Entities := New_Elmt_List;
1566 Analyze_Package_Instantiation (N);
1568 if Parent_Installed then
1573 -- If there are no generic associations, the generic parameters
1574 -- appear as local entities and are instantiated like them. We copy
1575 -- the generic package declaration as if it were an instantiation,
1576 -- and analyze it like a regular package, except that we treat the
1577 -- formals as additional visible components.
1579 Save_Env (Gen_Unit, Formal);
1581 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1583 if In_Extended_Main_Source_Unit (N) then
1584 Set_Is_Instantiated (Gen_Unit);
1585 Generate_Reference (Gen_Unit, N);
1590 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1591 Set_Defining_Unit_Name (Specification (New_N), Formal);
1594 Enter_Name (Formal);
1595 Set_Ekind (Formal, E_Generic_Package);
1596 Set_Etype (Formal, Standard_Void_Type);
1597 Set_Inner_Instances (Formal, New_Elmt_List);
1600 -- Within the formal, the name of the generic package is a renaming
1601 -- of the formal (as for a regular instantiation).
1603 Renaming := Make_Package_Renaming_Declaration (Loc,
1604 Defining_Unit_Name =>
1605 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1606 Name => New_Reference_To (Formal, Loc));
1608 if Present (Visible_Declarations (Specification (N))) then
1609 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1610 elsif Present (Private_Declarations (Specification (N))) then
1611 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1614 if Is_Child_Unit (Gen_Unit)
1615 and then Parent_Installed
1617 -- Similarly, we have to make the name of the formal visible in
1618 -- the parent instance, to resolve properly fully qualified names
1619 -- that may appear in the generic unit. The parent instance has
1620 -- been placed on the scope stack ahead of the current scope.
1622 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1625 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1626 Set_Ekind (Renaming_In_Par, E_Package);
1627 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1628 Set_Scope (Renaming_In_Par, Parent_Instance);
1629 Set_Parent (Renaming_In_Par, Parent (Formal));
1630 Set_Renamed_Object (Renaming_In_Par, Formal);
1631 Append_Entity (Renaming_In_Par, Parent_Instance);
1634 Analyze_Generic_Formal_Part (N);
1635 Analyze (Specification (N));
1636 End_Package_Scope (Formal);
1638 if Parent_Installed then
1644 -- Inside the generic unit, the formal package is a regular
1645 -- package, but no body is needed for it. Note that after
1646 -- instantiation, the defining_unit_name we need is in the
1647 -- new tree and not in the original. (see Package_Instantiation).
1648 -- A generic formal package is an instance, and can be used as
1649 -- an actual for an inner instance. Mark its generic parent.
1651 Set_Ekind (Formal, E_Package);
1652 Set_Generic_Parent (Specification (N), Gen_Unit);
1653 Set_Has_Completion (Formal, True);
1655 end Analyze_Formal_Package;
1657 ---------------------------------
1658 -- Analyze_Formal_Private_Type --
1659 ---------------------------------
1661 procedure Analyze_Formal_Private_Type
1667 New_Private_Type (N, T, Def);
1669 -- Set the size to an arbitrary but legal value.
1671 Set_Size_Info (T, Standard_Integer);
1672 Set_RM_Size (T, RM_Size (Standard_Integer));
1673 end Analyze_Formal_Private_Type;
1675 ----------------------------------------
1676 -- Analyze_Formal_Signed_Integer_Type --
1677 ----------------------------------------
1679 procedure Analyze_Formal_Signed_Integer_Type
1683 Base : constant Entity_Id :=
1685 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1690 Set_Ekind (T, E_Signed_Integer_Subtype);
1691 Set_Etype (T, Base);
1692 Set_Size_Info (T, Standard_Integer);
1693 Set_RM_Size (T, RM_Size (Standard_Integer));
1694 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1696 Set_Is_Generic_Type (Base);
1697 Set_Size_Info (Base, Standard_Integer);
1698 Set_RM_Size (Base, RM_Size (Standard_Integer));
1699 Set_Etype (Base, Base);
1700 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1701 Set_Parent (Base, Parent (Def));
1702 end Analyze_Formal_Signed_Integer_Type;
1704 -------------------------------
1705 -- Analyze_Formal_Subprogram --
1706 -------------------------------
1708 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1709 Spec : constant Node_Id := Specification (N);
1710 Def : constant Node_Id := Default_Name (N);
1711 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1719 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1720 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1724 Analyze_Subprogram_Declaration (N);
1725 Set_Is_Formal_Subprogram (Nam);
1726 Set_Has_Completion (Nam);
1728 -- Default name is resolved at the point of instantiation
1730 if Box_Present (N) then
1733 -- Else default is bound at the point of generic declaration
1735 elsif Present (Def) then
1736 if Nkind (Def) = N_Operator_Symbol then
1737 Find_Direct_Name (Def);
1739 elsif Nkind (Def) /= N_Attribute_Reference then
1743 -- For an attribute reference, analyze the prefix and verify
1744 -- that it has the proper profile for the subprogram.
1746 Analyze (Prefix (Def));
1747 Valid_Default_Attribute (Nam, Def);
1751 -- Default name may be overloaded, in which case the interpretation
1752 -- with the correct profile must be selected, as for a renaming.
1754 if Etype (Def) = Any_Type then
1757 elsif Nkind (Def) = N_Selected_Component then
1758 Subp := Entity (Selector_Name (Def));
1760 if Ekind (Subp) /= E_Entry then
1761 Error_Msg_N ("expect valid subprogram name as default", Def);
1765 elsif Nkind (Def) = N_Indexed_Component then
1767 if Nkind (Prefix (Def)) /= N_Selected_Component then
1768 Error_Msg_N ("expect valid subprogram name as default", Def);
1772 Subp := Entity (Selector_Name (Prefix (Def)));
1774 if Ekind (Subp) /= E_Entry_Family then
1775 Error_Msg_N ("expect valid subprogram name as default", Def);
1780 elsif Nkind (Def) = N_Character_Literal then
1782 -- Needs some type checks: subprogram should be parameterless???
1784 Resolve (Def, (Etype (Nam)));
1786 elsif (not Is_Entity_Name (Def)
1787 or else not Is_Overloadable (Entity (Def)))
1789 Error_Msg_N ("expect valid subprogram name as default", Def);
1792 elsif not Is_Overloaded (Def) then
1793 Subp := Entity (Def);
1796 Error_Msg_N ("premature usage of formal subprogram", Def);
1798 elsif not Entity_Matches_Spec (Subp, Nam) then
1799 Error_Msg_N ("no visible entity matches specification", Def);
1805 I1 : Interp_Index := 0;
1811 Get_First_Interp (Def, I, It);
1812 while Present (It.Nam) loop
1814 if Entity_Matches_Spec (It.Nam, Nam) then
1815 if Subp /= Any_Id then
1816 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1818 if It1 = No_Interp then
1819 Error_Msg_N ("ambiguous default subprogram", Def);
1832 Get_Next_Interp (I, It);
1836 if Subp /= Any_Id then
1837 Set_Entity (Def, Subp);
1840 Error_Msg_N ("premature usage of formal subprogram", Def);
1842 elsif Ekind (Subp) /= E_Operator then
1843 Check_Mode_Conformant (Subp, Nam);
1847 Error_Msg_N ("no visible subprogram matches specification", N);
1851 end Analyze_Formal_Subprogram;
1853 -------------------------------------
1854 -- Analyze_Formal_Type_Declaration --
1855 -------------------------------------
1857 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1858 Def : constant Node_Id := Formal_Type_Definition (N);
1862 T := Defining_Identifier (N);
1864 if Present (Discriminant_Specifications (N))
1865 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1868 ("discriminants not allowed for this formal type",
1869 Defining_Identifier (First (Discriminant_Specifications (N))));
1872 -- Enter the new name, and branch to specific routine.
1875 when N_Formal_Private_Type_Definition =>
1876 Analyze_Formal_Private_Type (N, T, Def);
1878 when N_Formal_Derived_Type_Definition =>
1879 Analyze_Formal_Derived_Type (N, T, Def);
1881 when N_Formal_Discrete_Type_Definition =>
1882 Analyze_Formal_Discrete_Type (T, Def);
1884 when N_Formal_Signed_Integer_Type_Definition =>
1885 Analyze_Formal_Signed_Integer_Type (T, Def);
1887 when N_Formal_Modular_Type_Definition =>
1888 Analyze_Formal_Modular_Type (T, Def);
1890 when N_Formal_Floating_Point_Definition =>
1891 Analyze_Formal_Floating_Type (T, Def);
1893 when N_Formal_Ordinary_Fixed_Point_Definition =>
1894 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1896 when N_Formal_Decimal_Fixed_Point_Definition =>
1897 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1899 when N_Array_Type_Definition =>
1900 Analyze_Formal_Array_Type (T, Def);
1902 when N_Access_To_Object_Definition |
1903 N_Access_Function_Definition |
1904 N_Access_Procedure_Definition =>
1905 Analyze_Generic_Access_Type (T, Def);
1911 raise Program_Error;
1915 Set_Is_Generic_Type (T);
1916 end Analyze_Formal_Type_Declaration;
1918 ------------------------------------
1919 -- Analyze_Function_Instantiation --
1920 ------------------------------------
1922 procedure Analyze_Function_Instantiation (N : Node_Id) is
1924 Analyze_Subprogram_Instantiation (N, E_Function);
1925 end Analyze_Function_Instantiation;
1927 ---------------------------------
1928 -- Analyze_Generic_Access_Type --
1929 ---------------------------------
1931 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1935 if Nkind (Def) = N_Access_To_Object_Definition then
1936 Access_Type_Declaration (T, Def);
1938 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1939 and then No (Full_View (Designated_Type (T)))
1940 and then not Is_Generic_Type (Designated_Type (T))
1942 Error_Msg_N ("premature usage of incomplete type", Def);
1944 elsif Is_Internal (Designated_Type (T)) then
1946 ("only a subtype mark is allowed in a formal", Def);
1950 Access_Subprogram_Declaration (T, Def);
1952 end Analyze_Generic_Access_Type;
1954 ---------------------------------
1955 -- Analyze_Generic_Formal_Part --
1956 ---------------------------------
1958 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
1959 Gen_Parm_Decl : Node_Id;
1962 -- The generic formals are processed in the scope of the generic
1963 -- unit, where they are immediately visible. The scope is installed
1966 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
1968 while Present (Gen_Parm_Decl) loop
1969 Analyze (Gen_Parm_Decl);
1970 Next (Gen_Parm_Decl);
1972 end Analyze_Generic_Formal_Part;
1974 ------------------------------------------
1975 -- Analyze_Generic_Package_Declaration --
1976 ------------------------------------------
1978 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
1981 Save_Parent : Node_Id;
1984 -- Create copy of generic unit, and save for instantiation.
1985 -- If the unit is a child unit, do not copy the specifications
1986 -- for the parent, which are not part of the generic tree.
1988 Save_Parent := Parent_Spec (N);
1989 Set_Parent_Spec (N, Empty);
1991 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
1992 Set_Parent_Spec (New_N, Save_Parent);
1994 Id := Defining_Entity (N);
1995 Generate_Definition (Id);
1997 -- Expansion is not applied to generic units.
2002 Set_Ekind (Id, E_Generic_Package);
2003 Set_Etype (Id, Standard_Void_Type);
2005 Enter_Generic_Scope (Id);
2006 Set_Inner_Instances (Id, New_Elmt_List);
2008 Set_Categorization_From_Pragmas (N);
2009 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2011 -- For a library unit, we have reconstructed the entity for the
2012 -- unit, and must reset it in the library tables.
2014 if Nkind (Parent (N)) = N_Compilation_Unit then
2015 Set_Cunit_Entity (Current_Sem_Unit, Id);
2018 Analyze_Generic_Formal_Part (N);
2020 -- After processing the generic formals, analysis proceeds
2021 -- as for a non-generic package.
2023 Analyze (Specification (N));
2025 Validate_Categorization_Dependency (N, Id);
2029 End_Package_Scope (Id);
2030 Exit_Generic_Scope (Id);
2032 if Nkind (Parent (N)) /= N_Compilation_Unit then
2033 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2034 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2035 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2038 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2039 Validate_RT_RAT_Component (N);
2042 end Analyze_Generic_Package_Declaration;
2044 --------------------------------------------
2045 -- Analyze_Generic_Subprogram_Declaration --
2046 --------------------------------------------
2048 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2053 Save_Parent : Node_Id;
2056 -- Create copy of generic unit,and save for instantiation.
2057 -- If the unit is a child unit, do not copy the specifications
2058 -- for the parent, which are not part of the generic tree.
2060 Save_Parent := Parent_Spec (N);
2061 Set_Parent_Spec (N, Empty);
2063 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2064 Set_Parent_Spec (New_N, Save_Parent);
2067 Spec := Specification (N);
2068 Id := Defining_Entity (Spec);
2069 Generate_Definition (Id);
2071 if Nkind (Id) = N_Defining_Operator_Symbol then
2073 ("operator symbol not allowed for generic subprogram", Id);
2080 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2082 Enter_Generic_Scope (Id);
2083 Set_Inner_Instances (Id, New_Elmt_List);
2084 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2086 Analyze_Generic_Formal_Part (N);
2088 Formals := Parameter_Specifications (Spec);
2090 if Present (Formals) then
2091 Process_Formals (Formals, Spec);
2094 if Nkind (Spec) = N_Function_Specification then
2095 Set_Ekind (Id, E_Generic_Function);
2096 Find_Type (Subtype_Mark (Spec));
2097 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2099 Set_Ekind (Id, E_Generic_Procedure);
2100 Set_Etype (Id, Standard_Void_Type);
2103 -- For a library unit, we have reconstructed the entity for the
2104 -- unit, and must reset it in the library tables. We also need
2105 -- to make sure that Body_Required is set properly in the original
2106 -- compilation unit node.
2108 if Nkind (Parent (N)) = N_Compilation_Unit then
2109 Set_Cunit_Entity (Current_Sem_Unit, Id);
2110 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2113 Set_Categorization_From_Pragmas (N);
2114 Validate_Categorization_Dependency (N, Id);
2116 Save_Global_References (Original_Node (N));
2120 Exit_Generic_Scope (Id);
2122 end Analyze_Generic_Subprogram_Declaration;
2124 -----------------------------------
2125 -- Analyze_Package_Instantiation --
2126 -----------------------------------
2128 -- Note: this procedure is also used for formal package declarations,
2129 -- in which case the argument N is an N_Formal_Package_Declaration
2130 -- node. This should really be noted in the spec! ???
2132 procedure Analyze_Package_Instantiation (N : Node_Id) is
2133 Loc : constant Source_Ptr := Sloc (N);
2134 Gen_Id : constant Node_Id := Name (N);
2137 Act_Decl_Name : Node_Id;
2138 Act_Decl_Id : Entity_Id;
2143 Gen_Unit : Entity_Id;
2145 Is_Actual_Pack : Boolean := Is_Internal (Defining_Entity (N));
2146 Parent_Installed : Boolean := False;
2147 Renaming_List : List_Id;
2148 Unit_Renaming : Node_Id;
2149 Needs_Body : Boolean;
2150 Inline_Now : Boolean := False;
2152 procedure Delay_Descriptors (E : Entity_Id);
2153 -- Delay generation of subprogram descriptors for given entity
2155 function Might_Inline_Subp return Boolean;
2156 -- If inlining is active and the generic contains inlined subprograms,
2157 -- we instantiate the body. This may cause superfluous instantiations,
2158 -- but it is simpler than detecting the need for the body at the point
2159 -- of inlining, when the context of the instance is not available.
2161 -----------------------
2162 -- Delay_Descriptors --
2163 -----------------------
2165 procedure Delay_Descriptors (E : Entity_Id) is
2167 if not Delay_Subprogram_Descriptors (E) then
2168 Set_Delay_Subprogram_Descriptors (E);
2169 Pending_Descriptor.Increment_Last;
2170 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2172 end Delay_Descriptors;
2174 -----------------------
2175 -- Might_Inline_Subp --
2176 -----------------------
2178 function Might_Inline_Subp return Boolean is
2182 if not Inline_Processing_Required then
2186 E := First_Entity (Gen_Unit);
2188 while Present (E) loop
2190 if Is_Subprogram (E)
2191 and then Is_Inlined (E)
2201 end Might_Inline_Subp;
2203 -- Start of processing for Analyze_Package_Instantiation
2206 -- Very first thing: apply the special kludge for Text_IO processing
2207 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2209 Text_IO_Kludge (Name (N));
2211 -- Make node global for error reporting.
2213 Instantiation_Node := N;
2215 -- Case of instantiation of a generic package
2217 if Nkind (N) = N_Package_Instantiation then
2218 Act_Decl_Id := New_Copy (Defining_Entity (N));
2219 Set_Comes_From_Source (Act_Decl_Id, True);
2221 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2223 Make_Defining_Program_Unit_Name (Loc,
2224 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2225 Defining_Identifier => Act_Decl_Id);
2227 Act_Decl_Name := Act_Decl_Id;
2230 -- Case of instantiation of a formal package
2233 Act_Decl_Id := Defining_Identifier (N);
2234 Act_Decl_Name := Act_Decl_Id;
2237 Generate_Definition (Act_Decl_Id);
2238 Pre_Analyze_Actuals (N);
2240 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2241 Gen_Unit := Entity (Gen_Id);
2243 -- Verify that it is the name of a generic package
2245 if Etype (Gen_Unit) = Any_Type then
2248 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2250 ("expect name of generic package in instantiation", Gen_Id);
2254 if In_Extended_Main_Source_Unit (N) then
2255 Set_Is_Instantiated (Gen_Unit);
2256 Generate_Reference (Gen_Unit, N);
2258 if Present (Renamed_Object (Gen_Unit)) then
2259 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2260 Generate_Reference (Renamed_Object (Gen_Unit), N);
2264 if Nkind (Gen_Id) = N_Identifier
2265 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2268 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2270 elsif Nkind (Gen_Id) = N_Expanded_Name
2271 and then Is_Child_Unit (Gen_Unit)
2272 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2273 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2276 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2279 Set_Entity (Gen_Id, Gen_Unit);
2281 -- If generic is a renaming, get original generic unit.
2283 if Present (Renamed_Object (Gen_Unit))
2284 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2286 Gen_Unit := Renamed_Object (Gen_Unit);
2289 -- Verify that there are no circular instantiations.
2291 if In_Open_Scopes (Gen_Unit) then
2292 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2295 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2296 Error_Msg_Node_2 := Current_Scope;
2298 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2299 Circularity_Detected := True;
2303 Save_Env (Gen_Unit, Act_Decl_Id);
2304 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2306 -- Initialize renamings map, for error checking, and the list
2307 -- that holds private entities whose views have changed between
2308 -- generic definition and instantiation. If this is the instance
2309 -- created to validate an actual package, the instantiation
2310 -- environment is that of the enclosing instance.
2312 Generic_Renamings.Set_Last (0);
2313 Generic_Renamings_HTable.Reset;
2315 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2317 -- Copy original generic tree, to produce text for instantiation.
2321 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2323 Act_Spec := Specification (Act_Tree);
2325 -- If this is the instance created to validate an actual package,
2326 -- only the formals matter, do not examine the package spec itself.
2328 if Is_Actual_Pack then
2329 Set_Visible_Declarations (Act_Spec, New_List);
2330 Set_Private_Declarations (Act_Spec, New_List);
2334 Analyze_Associations
2336 Generic_Formal_Declarations (Act_Tree),
2337 Generic_Formal_Declarations (Gen_Decl));
2339 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2340 Set_Is_Generic_Instance (Act_Decl_Id);
2342 Set_Generic_Parent (Act_Spec, Gen_Unit);
2344 -- References to the generic in its own declaration or its body
2345 -- are references to the instance. Add a renaming declaration for
2346 -- the generic unit itself. This declaration, as well as the renaming
2347 -- declarations for the generic formals, must remain private to the
2348 -- unit: the formals, because this is the language semantics, and
2349 -- the unit because its use is an artifact of the implementation.
2352 Make_Package_Renaming_Declaration (Loc,
2353 Defining_Unit_Name =>
2354 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2355 Name => New_Reference_To (Act_Decl_Id, Loc));
2357 Append (Unit_Renaming, Renaming_List);
2359 -- The renaming declarations are the first local declarations of
2362 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2364 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2366 Set_Visible_Declarations (Act_Spec, Renaming_List);
2370 Make_Package_Declaration (Loc,
2371 Specification => Act_Spec);
2373 -- Save the instantiation node, for subsequent instantiation
2374 -- of the body, if there is one and we are generating code for
2375 -- the current unit. Mark the unit as having a body, to avoid
2376 -- a premature error message.
2378 -- We instantiate the body if we are generating code, if we are
2379 -- generating cross-reference information, or if we are building
2380 -- trees for ASIS use.
2383 Enclosing_Body_Present : Boolean := False;
2387 if Scope (Gen_Unit) /= Standard_Standard
2388 and then not Is_Child_Unit (Gen_Unit)
2390 Scop := Scope (Gen_Unit);
2392 while Present (Scop)
2393 and then Scop /= Standard_Standard
2395 if Unit_Requires_Body (Scop) then
2396 Enclosing_Body_Present := True;
2400 Scop := Scope (Scop);
2404 -- If front-end inlining is enabled, and this is a unit for which
2405 -- code will be generated, we instantiate the body at once.
2406 -- This is done if the instance is not the main unit, and if the
2407 -- generic is not a child unit, to avoid scope problems.
2409 if Front_End_Inlining
2410 and then Expander_Active
2411 and then not Is_Child_Unit (Gen_Unit)
2412 and then Is_In_Main_Unit (N)
2413 and then Nkind (Parent (N)) /= N_Compilation_Unit
2414 and then Might_Inline_Subp
2420 (Unit_Requires_Body (Gen_Unit)
2421 or else Enclosing_Body_Present
2422 or else Present (Corresponding_Body (Gen_Decl)))
2423 and then (Is_In_Main_Unit (N)
2424 or else Might_Inline_Subp)
2425 and then not Is_Actual_Pack
2426 and then not Inline_Now
2428 and then (Operating_Mode = Generate_Code
2429 or else (Operating_Mode = Check_Semantics
2430 and then Tree_Output));
2432 -- If front_end_inlining is enabled, do not instantiate a
2433 -- body if within a generic context.
2435 if Front_End_Inlining
2436 and then not Expander_Active
2438 Needs_Body := False;
2443 -- If we are generating the calling stubs from the instantiation
2444 -- of a generic RCI package, we will not use the body of the
2447 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2448 and then Is_Compilation_Unit (Defining_Entity (N))
2450 Needs_Body := False;
2455 -- Here is a defence against a ludicrous number of instantiations
2456 -- caused by a circular set of instantiation attempts.
2458 if Pending_Instantiations.Last >
2459 Hostparm.Max_Instantiations
2461 Error_Msg_N ("too many instantiations", N);
2462 raise Unrecoverable_Error;
2465 -- Indicate that the enclosing scopes contain an instantiation,
2466 -- and that cleanup actions should be delayed until after the
2467 -- instance body is expanded.
2469 Check_Forward_Instantiation (Gen_Decl);
2470 if Nkind (N) = N_Package_Instantiation then
2472 Enclosing_Master : Entity_Id := Current_Scope;
2475 while Enclosing_Master /= Standard_Standard loop
2477 if Ekind (Enclosing_Master) = E_Package then
2478 if Is_Compilation_Unit (Enclosing_Master) then
2479 if In_Package_Body (Enclosing_Master) then
2481 (Body_Entity (Enclosing_Master));
2490 Enclosing_Master := Scope (Enclosing_Master);
2493 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2494 Enclosing_Master := Scope (Enclosing_Master);
2496 elsif Ekind (Enclosing_Master) = E_Generic_Function
2497 or else Ekind (Enclosing_Master) = E_Generic_Procedure
2498 or else Ekind (Enclosing_Master) = E_Void
2500 -- Cleanup actions will eventually be performed on
2501 -- the enclosing instance, if any. enclosing scope
2502 -- is void in the formal part of a generic subp.
2507 if Ekind (Enclosing_Master) = E_Entry
2509 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2512 Protected_Body_Subprogram (Enclosing_Master);
2515 Set_Delay_Cleanups (Enclosing_Master);
2517 while Ekind (Enclosing_Master) = E_Block loop
2518 Enclosing_Master := Scope (Enclosing_Master);
2521 if Is_Subprogram (Enclosing_Master) then
2522 Delay_Descriptors (Enclosing_Master);
2524 elsif Is_Task_Type (Enclosing_Master) then
2526 TBP : constant Node_Id :=
2527 Get_Task_Body_Procedure
2531 if Present (TBP) then
2532 Delay_Descriptors (TBP);
2533 Set_Delay_Cleanups (TBP);
2543 -- Make entry in table
2545 Pending_Instantiations.Increment_Last;
2546 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2547 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2551 Set_Categorization_From_Pragmas (Act_Decl);
2553 if Parent_Installed then
2557 Set_Instance_Spec (N, Act_Decl);
2559 -- If not a compilation unit, insert the package declaration
2560 -- after the instantiation node.
2562 if Nkind (Parent (N)) /= N_Compilation_Unit then
2563 Mark_Rewrite_Insertion (Act_Decl);
2564 Insert_Before (N, Act_Decl);
2567 -- For an instantiation that is a compilation unit, place
2568 -- declaration on current node so context is complete
2569 -- for analysis (including nested instantiations). It this
2570 -- is the main unit, the declaration eventually replaces the
2571 -- instantiation node. If the instance body is later created, it
2572 -- replaces the instance node, and the declation is attached to
2573 -- it (see Build_Instance_Compilation_Unit_Nodes).
2576 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2578 -- The entity for the current unit is the newly created one,
2579 -- and all semantic information is attached to it.
2581 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2583 -- If this is the main unit, replace the main entity as well.
2585 if Current_Sem_Unit = Main_Unit then
2586 Main_Unit_Entity := Act_Decl_Id;
2590 Set_Unit (Parent (N), Act_Decl);
2591 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2593 Set_Unit (Parent (N), N);
2594 Set_Body_Required (Parent (N), False);
2596 -- We never need elaboration checks on instantiations, since
2597 -- by definition, the body instantiation is elaborated at the
2598 -- same time as the spec instantiation.
2600 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2601 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2604 Check_Elab_Instantiation (N);
2606 if ABE_Is_Certain (N) and then Needs_Body then
2607 Pending_Instantiations.Decrement_Last;
2609 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2611 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2612 First_Private_Entity (Act_Decl_Id));
2614 if Nkind (Parent (N)) = N_Compilation_Unit
2615 and then not Needs_Body
2617 Rewrite (N, Act_Decl);
2620 if Present (Corresponding_Body (Gen_Decl))
2621 or else Unit_Requires_Body (Gen_Unit)
2623 Set_Has_Completion (Act_Decl_Id);
2626 Check_Formal_Packages (Act_Decl_Id);
2628 Restore_Private_Views (Act_Decl_Id);
2630 if not Generic_Separately_Compiled (Gen_Unit) then
2631 Inherit_Context (Gen_Decl, N);
2634 if Parent_Installed then
2641 Validate_Categorization_Dependency (N, Act_Decl_Id);
2643 -- Check restriction, but skip this if something went wrong in
2644 -- the above analysis, indicated by Act_Decl_Id being void.
2646 if Ekind (Act_Decl_Id) /= E_Void
2647 and then not Is_Library_Level_Entity (Act_Decl_Id)
2649 Check_Restriction (No_Local_Allocators, N);
2653 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2657 when Instantiation_Error =>
2658 if Parent_Installed then
2662 end Analyze_Package_Instantiation;
2664 ---------------------------
2665 -- Inline_Instance_Body --
2666 ---------------------------
2668 procedure Inline_Instance_Body
2670 Gen_Unit : Entity_Id;
2674 Gen_Comp : constant Entity_Id :=
2675 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2676 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2677 Curr_Scope : Entity_Id := Empty;
2678 Curr_Unit : constant Entity_Id :=
2679 Cunit_Entity (Current_Sem_Unit);
2680 Removed : Boolean := False;
2681 Num_Scopes : Int := 0;
2682 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2683 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2684 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2685 Num_Inner : Int := 0;
2686 N_Instances : Int := 0;
2690 -- Case of generic unit defined in another unit
2692 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2693 Vis := Is_Immediately_Visible (Gen_Comp);
2698 and then S /= Standard_Standard
2700 Num_Scopes := Num_Scopes + 1;
2702 Use_Clauses (Num_Scopes) :=
2704 (Scope_Stack.Last - Num_Scopes + 1).
2706 End_Use_Clauses (Use_Clauses (Num_Scopes));
2708 exit when Is_Generic_Instance (S)
2709 and then (In_Package_Body (S)
2710 or else Ekind (S) = E_Procedure
2711 or else Ekind (S) = E_Function);
2715 -- Find and save all enclosing instances
2720 and then S /= Standard_Standard
2722 if Is_Generic_Instance (S) then
2723 N_Instances := N_Instances + 1;
2724 Instances (N_Instances) := S;
2730 -- Remove context of current compilation unit, unless we
2731 -- are within a nested package instantiation, in which case
2732 -- the context has been removed previously.
2734 -- If current scope is the body of a child unit, remove context
2740 and then S /= Standard_Standard
2742 exit when Is_Generic_Instance (S)
2743 and then (In_Package_Body (S)
2744 or else Ekind (S) = E_Procedure
2745 or else Ekind (S) = E_Function);
2748 or else (Ekind (Curr_Unit) = E_Package_Body
2749 and then S = Spec_Entity (Curr_Unit))
2753 -- Remove entities in current scopes from visibility, so
2754 -- than instance body is compiled in a clean environment.
2758 if Is_Child_Unit (S) then
2760 -- Remove child unit from stack, as well as inner scopes.
2761 -- Removing the context of a child unit removes parent
2764 while Current_Scope /= S loop
2765 Num_Inner := Num_Inner + 1;
2766 Inner_Scopes (Num_Inner) := Current_Scope;
2771 Remove_Context (Curr_Comp);
2775 Remove_Context (Curr_Comp);
2778 if Ekind (Curr_Unit) = E_Package_Body then
2779 Remove_Context (Library_Unit (Curr_Comp));
2786 New_Scope (Standard_Standard);
2787 Instantiate_Package_Body
2788 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2793 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2795 -- Reset Generic_Instance flag so that use clauses can be installed
2796 -- in the proper order. (See Use_One_Package for effect of enclosing
2797 -- instances on processing of use clauses).
2799 for J in 1 .. N_Instances loop
2800 Set_Is_Generic_Instance (Instances (J), False);
2804 Install_Context (Curr_Comp);
2806 if Present (Curr_Scope)
2807 and then Is_Child_Unit (Curr_Scope)
2809 New_Scope (Curr_Scope);
2810 Set_Is_Immediately_Visible (Curr_Scope);
2812 -- Finally, restore inner scopes as well.
2814 for J in reverse 1 .. Num_Inner loop
2815 New_Scope (Inner_Scopes (J));
2819 Restore_Scope_Stack;
2822 for J in reverse 1 .. Num_Scopes loop
2823 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
2825 Install_Use_Clauses (Use_Clauses (J));
2828 for J in 1 .. N_Instances loop
2829 Set_Is_Generic_Instance (Instances (J), True);
2832 -- If generic unit is in current unit, current context is correct.
2835 Instantiate_Package_Body
2836 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2838 end Inline_Instance_Body;
2840 -------------------------------------
2841 -- Analyze_Procedure_Instantiation --
2842 -------------------------------------
2844 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
2846 Analyze_Subprogram_Instantiation (N, E_Procedure);
2847 end Analyze_Procedure_Instantiation;
2849 --------------------------------------
2850 -- Analyze_Subprogram_Instantiation --
2851 --------------------------------------
2853 procedure Analyze_Subprogram_Instantiation
2857 Loc : constant Source_Ptr := Sloc (N);
2858 Gen_Id : constant Node_Id := Name (N);
2860 Act_Decl_Id : Entity_Id;
2861 Anon_Id : Entity_Id :=
2862 Make_Defining_Identifier
2863 (Sloc (Defining_Entity (N)),
2865 (Chars (Defining_Entity (N)), 'R'));
2870 Gen_Unit : Entity_Id;
2872 Pack_Id : Entity_Id;
2873 Parent_Installed : Boolean := False;
2874 Renaming_List : List_Id;
2877 procedure Analyze_Instance_And_Renamings;
2878 -- The instance must be analyzed in a context that includes the
2879 -- mappings of generic parameters into actuals. We create a package
2880 -- declaration for this purpose, and a subprogram with an internal
2881 -- name within the package. The subprogram instance is simply an
2882 -- alias for the internal subprogram, declared in the current scope.
2884 ------------------------------------
2885 -- Analyze_Instance_And_Renamings --
2886 ------------------------------------
2888 procedure Analyze_Instance_And_Renamings is
2889 Def_Ent : constant Entity_Id := Defining_Entity (N);
2890 Pack_Decl : Node_Id;
2893 if Nkind (Parent (N)) = N_Compilation_Unit then
2895 -- For the case of a compilation unit, the container package
2896 -- has the same name as the instantiation, to insure that the
2897 -- binder calls the elaboration procedure with the right name.
2898 -- Copy the entity of the instance, which may have compilation
2899 -- level flags (eg. is_child_unit) set.
2901 Pack_Id := New_Copy (Def_Ent);
2904 -- Otherwise we use the name of the instantiation concatenated
2905 -- with its source position to ensure uniqueness if there are
2906 -- several instantiations with the same name.
2909 Make_Defining_Identifier (Loc,
2910 Chars => New_External_Name
2911 (Related_Id => Chars (Def_Ent),
2913 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
2916 Pack_Decl := Make_Package_Declaration (Loc,
2917 Specification => Make_Package_Specification (Loc,
2918 Defining_Unit_Name => Pack_Id,
2919 Visible_Declarations => Renaming_List,
2920 End_Label => Empty));
2922 Set_Instance_Spec (N, Pack_Decl);
2923 Set_Is_Generic_Instance (Pack_Id);
2925 -- Case of not a compilation unit
2927 if Nkind (Parent (N)) /= N_Compilation_Unit then
2928 Mark_Rewrite_Insertion (Pack_Decl);
2929 Insert_Before (N, Pack_Decl);
2930 Set_Has_Completion (Pack_Id);
2932 -- Case of an instantiation that is a compilation unit
2934 -- Place declaration on current node so context is complete
2935 -- for analysis (including nested instantiations), and for
2936 -- use in a context_clause (see Analyze_With_Clause).
2939 Set_Unit (Parent (N), Pack_Decl);
2940 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
2943 Analyze (Pack_Decl);
2944 Check_Formal_Packages (Pack_Id);
2945 Set_Is_Generic_Instance (Pack_Id, False);
2947 -- Body of the enclosing package is supplied when instantiating
2948 -- the subprogram body, after semantic analysis is completed.
2950 if Nkind (Parent (N)) = N_Compilation_Unit then
2952 -- Remove package itself from visibility, so it does not
2953 -- conflict with subprogram.
2955 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
2957 -- Set name and scope of internal subprogram so that the
2958 -- proper external name will be generated. The proper scope
2959 -- is the scope of the wrapper package.
2961 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
2962 Set_Scope (Anon_Id, Scope (Pack_Id));
2965 Set_Is_Generic_Instance (Anon_Id);
2966 Act_Decl_Id := New_Copy (Anon_Id);
2968 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
2969 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
2970 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
2971 Set_Comes_From_Source (Act_Decl_Id, True);
2973 -- The signature may involve types that are not frozen yet, but
2974 -- the subprogram will be frozen at the point the wrapper package
2975 -- is frozen, so it does not need its own freeze node. In fact, if
2976 -- one is created, it might conflict with the freezing actions from
2977 -- the wrapper package (see 7206-013).
2979 Set_Has_Delayed_Freeze (Anon_Id, False);
2981 -- If the instance is a child unit, mark the Id accordingly. Mark
2982 -- the anonymous entity as well, which is the real subprogram and
2983 -- which is used when the instance appears in a context clause.
2985 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
2986 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
2987 New_Overloaded_Entity (Act_Decl_Id);
2988 Check_Eliminated (Act_Decl_Id);
2990 -- In compilation unit case, kill elaboration checks on the
2991 -- instantiation, since they are never needed -- the body is
2992 -- instantiated at the same point as the spec.
2994 if Nkind (Parent (N)) = N_Compilation_Unit then
2995 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2996 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2997 Set_Is_Compilation_Unit (Anon_Id);
2999 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3002 -- The instance is not a freezing point for the new subprogram.
3004 Set_Is_Frozen (Act_Decl_Id, False);
3006 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3007 Valid_Operator_Definition (Act_Decl_Id);
3010 Set_Alias (Act_Decl_Id, Anon_Id);
3011 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3012 Set_Has_Completion (Act_Decl_Id);
3013 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3015 if Nkind (Parent (N)) = N_Compilation_Unit then
3016 Set_Body_Required (Parent (N), False);
3019 end Analyze_Instance_And_Renamings;
3021 -- Start of processing for Analyze_Subprogram_Instantiation
3024 -- Very first thing: apply the special kludge for Text_IO processing
3025 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3026 -- Of course such an instantiation is bogus (these are packages, not
3027 -- subprograms), but we get a better error message if we do this.
3029 Text_IO_Kludge (Gen_Id);
3031 -- Make node global for error reporting.
3033 Instantiation_Node := N;
3034 Pre_Analyze_Actuals (N);
3036 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3037 Gen_Unit := Entity (Gen_Id);
3039 Generate_Reference (Gen_Unit, Gen_Id);
3041 if Nkind (Gen_Id) = N_Identifier
3042 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3045 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3048 if Etype (Gen_Unit) = Any_Type then return; end if;
3050 -- Verify that it is a generic subprogram of the right kind, and that
3051 -- it does not lead to a circular instantiation.
3053 if Ekind (Gen_Unit) /= E_Generic_Procedure
3054 and then Ekind (Gen_Unit) /= E_Generic_Function
3056 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3058 elsif In_Open_Scopes (Gen_Unit) then
3059 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3061 elsif K = E_Procedure
3062 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3064 if Ekind (Gen_Unit) = E_Generic_Function then
3066 ("cannot instantiate generic function as procedure", Gen_Id);
3069 ("expect name of generic procedure in instantiation", Gen_Id);
3072 elsif K = E_Function
3073 and then Ekind (Gen_Unit) /= E_Generic_Function
3075 if Ekind (Gen_Unit) = E_Generic_Procedure then
3077 ("cannot instantiate generic procedure as function", Gen_Id);
3080 ("expect name of generic function in instantiation", Gen_Id);
3084 Set_Entity (Gen_Id, Gen_Unit);
3086 -- If renaming, get original unit.
3088 if Present (Renamed_Object (Gen_Unit))
3089 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3091 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3093 Gen_Unit := Renamed_Object (Gen_Unit);
3096 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3097 Error_Msg_Node_2 := Current_Scope;
3099 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3100 Circularity_Detected := True;
3104 if In_Extended_Main_Source_Unit (N) then
3105 Set_Is_Instantiated (Gen_Unit);
3106 Generate_Reference (Gen_Unit, N);
3109 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3110 Spec := Specification (Gen_Decl);
3112 -- The subprogram itself cannot contain a nested instance, so
3113 -- the current parent is left empty.
3115 Save_Env (Gen_Unit, Empty);
3117 -- Initialize renamings map, for error checking.
3119 Generic_Renamings.Set_Last (0);
3120 Generic_Renamings_HTable.Reset;
3122 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
3124 -- Copy original generic tree, to produce text for instantiation.
3128 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3130 Act_Spec := Specification (Act_Tree);
3132 Analyze_Associations
3134 Generic_Formal_Declarations (Act_Tree),
3135 Generic_Formal_Declarations (Gen_Decl));
3137 -- Build the subprogram declaration, which does not appear
3138 -- in the generic template, and give it a sloc consistent
3139 -- with that of the template.
3141 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3142 Set_Generic_Parent (Act_Spec, Gen_Unit);
3144 Make_Subprogram_Declaration (Sloc (Act_Spec),
3145 Specification => Act_Spec);
3147 Set_Categorization_From_Pragmas (Act_Decl);
3149 if Parent_Installed then
3153 Append (Act_Decl, Renaming_List);
3154 Analyze_Instance_And_Renamings;
3156 -- If the generic is marked Import (Intrinsic), then so is the
3157 -- instance. This indicates that there is no body to instantiate.
3158 -- If generic is marked inline, so it the instance, and the
3159 -- anonymous subprogram it renames. If inlined, or else if inlining
3160 -- is enabled for the compilation, we generate the instance body
3161 -- even if it is not within the main unit.
3163 -- Any other pragmas might also be inherited ???
3165 if Is_Intrinsic_Subprogram (Gen_Unit) then
3166 Set_Is_Intrinsic_Subprogram (Anon_Id);
3167 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3169 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3170 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3174 Generate_Definition (Act_Decl_Id);
3176 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3177 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3179 Check_Elab_Instantiation (N);
3180 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3182 -- Subject to change, pending on if other pragmas are inherited ???
3184 Validate_Categorization_Dependency (N, Act_Decl_Id);
3186 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3188 if not Generic_Separately_Compiled (Gen_Unit) then
3189 Inherit_Context (Gen_Decl, N);
3192 Restore_Private_Views (Pack_Id, False);
3194 -- If the context requires a full instantiation, mark node for
3195 -- subsequent construction of the body.
3197 if (Is_In_Main_Unit (N)
3198 or else Is_Inlined (Act_Decl_Id))
3199 and then (Operating_Mode = Generate_Code
3200 or else (Operating_Mode = Check_Semantics
3201 and then Tree_Output))
3202 and then (Expander_Active or else Tree_Output)
3203 and then not ABE_Is_Certain (N)
3204 and then not Is_Eliminated (Act_Decl_Id)
3206 Pending_Instantiations.Increment_Last;
3207 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3208 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3209 Check_Forward_Instantiation (Gen_Decl);
3211 -- The wrapper package is always delayed, because it does
3212 -- not constitute a freeze point, but to insure that the
3213 -- freeze node is placed properly, it is created directly
3214 -- when instantiating the body (otherwise the freeze node
3215 -- might appear to early for nested instantiations).
3217 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3219 -- For ASIS purposes, indicate that the wrapper package has
3220 -- replaced the instantiation node.
3222 Rewrite (N, Unit (Parent (N)));
3223 Set_Unit (Parent (N), N);
3226 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3228 -- Replace instance node for library-level instantiations
3229 -- of intrinsic subprograms, for ASIS use.
3231 Rewrite (N, Unit (Parent (N)));
3232 Set_Unit (Parent (N), N);
3235 if Parent_Installed then
3240 Generic_Renamings.Set_Last (0);
3241 Generic_Renamings_HTable.Reset;
3245 when Instantiation_Error =>
3246 if Parent_Installed then
3249 end Analyze_Subprogram_Instantiation;
3251 -------------------------
3252 -- Get_Associated_Node --
3253 -------------------------
3255 function Get_Associated_Node (N : Node_Id) return Node_Id is
3256 Assoc : Node_Id := Associated_Node (N);
3259 if Nkind (Assoc) /= Nkind (N) then
3262 elsif Nkind (Assoc) = N_Aggregate
3263 or else Nkind (Assoc) = N_Extension_Aggregate
3267 -- If the node is part of an inner generic, it may itself have been
3268 -- remapped into a further generic copy. Associated_Node is otherwise
3269 -- used for the entity of the node, and will be of a different node
3270 -- kind, or else N has been rewritten as a literal or function call.
3272 while Present (Associated_Node (Assoc))
3273 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3275 Assoc := Associated_Node (Assoc);
3278 -- Follow and additional link in case the final node was rewritten.
3279 -- This can only happen with nested generic units.
3281 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3282 and then Present (Associated_Node (Assoc))
3283 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3285 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3287 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3289 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3291 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3293 Assoc := Associated_Node (Assoc);
3298 end Get_Associated_Node;
3300 -------------------------------------------
3301 -- Build_Instance_Compilation_Unit_Nodes --
3302 -------------------------------------------
3304 procedure Build_Instance_Compilation_Unit_Nodes
3309 Decl_Cunit : Node_Id;
3310 Body_Cunit : Node_Id;
3312 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3313 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3316 -- A new compilation unit node is built for the instance declaration
3319 Make_Compilation_Unit (Sloc (N),
3320 Context_Items => Empty_List,
3323 Make_Compilation_Unit_Aux (Sloc (N)));
3325 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3326 Set_Body_Required (Decl_Cunit, True);
3328 -- We use the original instantiation compilation unit as the resulting
3329 -- compilation unit of the instance, since this is the main unit.
3331 Rewrite (N, Act_Body);
3332 Body_Cunit := Parent (N);
3334 -- The two compilation unit nodes are linked by the Library_Unit field
3336 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3337 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3339 -- If the instance is not the main unit, its context, categorization,
3340 -- and elaboration entity are not relevant to the compilation.
3342 if Parent (N) /= Cunit (Main_Unit) then
3346 -- The context clause items on the instantiation, which are now
3347 -- attached to the body compilation unit (since the body overwrote
3348 -- the original instantiation node), semantically belong on the spec,
3349 -- so copy them there. It's harmless to leave them on the body as well.
3350 -- In fact one could argue that they belong in both places.
3352 Citem := First (Context_Items (Body_Cunit));
3353 while Present (Citem) loop
3354 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3358 -- Propagate categorization flags on packages, so that they appear
3359 -- in ali file for the spec of the unit.
3361 if Ekind (New_Main) = E_Package then
3362 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3363 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3364 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3365 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3366 Set_Is_Remote_Call_Interface
3367 (Old_Main, Is_Remote_Call_Interface (New_Main));
3370 -- Make entry in Units table, so that binder can generate call to
3371 -- elaboration procedure for body, if any.
3373 Make_Instance_Unit (Body_Cunit);
3374 Main_Unit_Entity := New_Main;
3375 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3377 -- Build elaboration entity, since the instance may certainly
3378 -- generate elaboration code requiring a flag for protection.
3380 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3381 end Build_Instance_Compilation_Unit_Nodes;
3383 -----------------------------------
3384 -- Check_Formal_Package_Instance --
3385 -----------------------------------
3387 -- If the formal has specific parameters, they must match those of the
3388 -- actual. Both of them are instances, and the renaming declarations
3389 -- for their formal parameters appear in the same order in both. The
3390 -- analyzed formal has been analyzed in the context of the current
3393 procedure Check_Formal_Package_Instance
3394 (Formal_Pack : Entity_Id;
3395 Actual_Pack : Entity_Id)
3397 E1 : Entity_Id := First_Entity (Actual_Pack);
3398 E2 : Entity_Id := First_Entity (Formal_Pack);
3403 procedure Check_Mismatch (B : Boolean);
3404 -- Common error routine for mismatch between the parameters of
3405 -- the actual instance and those of the formal package.
3407 procedure Check_Mismatch (B : Boolean) is
3411 ("actual for & in actual instance does not match formal",
3412 Parent (Actual_Pack), E1);
3416 -- Start of processing for Check_Formal_Package_Instance
3420 and then Present (E2)
3422 exit when Ekind (E1) = E_Package
3423 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3425 if Is_Type (E1) then
3427 -- Subtypes must statically match. E1 and E2 are the
3428 -- local entities that are subtypes of the actuals.
3429 -- Itypes generated for other parameters need not be checked,
3430 -- the check will be performed on the parameters themselves.
3432 if not Is_Itype (E1)
3433 and then not Is_Itype (E2)
3437 or else Etype (E1) /= Etype (E2)
3438 or else not Subtypes_Statically_Match (E1, E2));
3441 elsif Ekind (E1) = E_Constant then
3443 -- IN parameters must denote the same static value, or
3444 -- the same constant, or the literal null.
3446 Expr1 := Expression (Parent (E1));
3448 if Ekind (E2) /= E_Constant then
3449 Check_Mismatch (True);
3452 Expr2 := Expression (Parent (E2));
3455 if Is_Static_Expression (Expr1) then
3457 if not Is_Static_Expression (Expr2) then
3458 Check_Mismatch (True);
3460 elsif Is_Integer_Type (Etype (E1)) then
3463 V1 : Uint := Expr_Value (Expr1);
3464 V2 : Uint := Expr_Value (Expr2);
3466 Check_Mismatch (V1 /= V2);
3469 elsif Is_Real_Type (Etype (E1)) then
3472 V1 : Ureal := Expr_Value_R (Expr1);
3473 V2 : Ureal := Expr_Value_R (Expr2);
3475 Check_Mismatch (V1 /= V2);
3478 elsif Is_String_Type (Etype (E1))
3479 and then Nkind (Expr1) = N_String_Literal
3482 if Nkind (Expr2) /= N_String_Literal then
3483 Check_Mismatch (True);
3486 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3490 elsif Is_Entity_Name (Expr1) then
3491 if Is_Entity_Name (Expr2) then
3492 if Entity (Expr1) = Entity (Expr2) then
3495 elsif Ekind (Entity (Expr2)) = E_Constant
3496 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3498 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3502 Check_Mismatch (True);
3505 Check_Mismatch (True);
3508 elsif Nkind (Expr1) = N_Null then
3509 Check_Mismatch (Nkind (Expr1) /= N_Null);
3512 Check_Mismatch (True);
3515 elsif Ekind (E1) = E_Variable
3516 or else Ekind (E1) = E_Package
3519 (Ekind (E1) /= Ekind (E2)
3520 or else Renamed_Object (E1) /= Renamed_Object (E2));
3522 elsif Is_Overloadable (E1) then
3524 -- Verify that the names of the entities match.
3525 -- What if actual is an attribute ???
3528 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3531 raise Program_Error;
3538 end Check_Formal_Package_Instance;
3540 ---------------------------
3541 -- Check_Formal_Packages --
3542 ---------------------------
3544 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3546 Formal_P : Entity_Id;
3549 -- Iterate through the declarations in the instance, looking for
3550 -- package renaming declarations that denote instances of formal
3551 -- packages. Stop when we find the renaming of the current package
3552 -- itself. The declaration for a formal package without a box is
3553 -- followed by an internal entity that repeats the instantiation.
3555 E := First_Entity (P_Id);
3556 while Present (E) loop
3557 if Ekind (E) = E_Package then
3558 if Renamed_Object (E) = P_Id then
3561 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3564 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3565 Formal_P := Next_Entity (E);
3566 Check_Formal_Package_Instance (Formal_P, E);
3572 end Check_Formal_Packages;
3574 ---------------------------------
3575 -- Check_Forward_Instantiation --
3576 ---------------------------------
3578 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3580 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3583 -- The instantiation appears before the generic body if we are in the
3584 -- scope of the unit containing the generic, either in its spec or in
3585 -- the package body. and before the generic body.
3587 if Ekind (Gen_Comp) = E_Package_Body then
3588 Gen_Comp := Spec_Entity (Gen_Comp);
3591 if In_Open_Scopes (Gen_Comp)
3592 and then No (Corresponding_Body (Decl))
3597 and then not Is_Compilation_Unit (S)
3598 and then not Is_Child_Unit (S)
3600 if Ekind (S) = E_Package then
3601 Set_Has_Forward_Instantiation (S);
3607 end Check_Forward_Instantiation;
3609 ---------------------------
3610 -- Check_Generic_Actuals --
3611 ---------------------------
3613 -- The visibility of the actuals may be different between the
3614 -- point of generic instantiation and the instantiation of the body.
3616 procedure Check_Generic_Actuals
3617 (Instance : Entity_Id;
3618 Is_Formal_Box : Boolean)
3624 E := First_Entity (Instance);
3625 while Present (E) loop
3627 and then Nkind (Parent (E)) = N_Subtype_Declaration
3628 and then Scope (Etype (E)) /= Instance
3629 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3631 Check_Private_View (Subtype_Indication (Parent (E)));
3632 Set_Is_Generic_Actual_Type (E, True);
3633 Set_Is_Hidden (E, False);
3635 -- We constructed the generic actual type as a subtype of
3636 -- the supplied type. This means that it normally would not
3637 -- inherit subtype specific attributes of the actual, which
3638 -- is wrong for the generic case.
3640 Astype := Ancestor_Subtype (E);
3644 -- can happen when E is an itype that is the full view of
3645 -- a private type completed, e.g. with a constrained array.
3647 Astype := Base_Type (E);
3650 Set_Size_Info (E, (Astype));
3651 Set_RM_Size (E, RM_Size (Astype));
3652 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3654 if Is_Discrete_Or_Fixed_Point_Type (E) then
3655 Set_RM_Size (E, RM_Size (Astype));
3657 -- In nested instances, the base type of an access actual
3658 -- may itself be private, and need to be exchanged.
3660 elsif Is_Access_Type (E)
3661 and then Is_Private_Type (Etype (E))
3664 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3667 elsif Ekind (E) = E_Package then
3669 -- If this is the renaming for the current instance, we're done.
3670 -- Otherwise it is a formal package. If the corresponding formal
3671 -- was declared with a box, the (instantiations of the) generic
3672 -- formal part are also visible. Otherwise, ignore the entity
3673 -- created to validate the actuals.
3675 if Renamed_Object (E) = Instance then
3678 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3681 -- The visibility of a formal of an enclosing generic is already
3684 elsif Denotes_Formal_Package (E) then
3687 elsif Present (Associated_Formal_Package (E))
3688 and then Box_Present (Parent (Associated_Formal_Package (E)))
3690 Check_Generic_Actuals (Renamed_Object (E), True);
3691 Set_Is_Hidden (E, False);
3695 Set_Is_Hidden (E, not Is_Formal_Box);
3701 end Check_Generic_Actuals;
3703 ------------------------------
3704 -- Check_Generic_Child_Unit --
3705 ------------------------------
3707 procedure Check_Generic_Child_Unit
3709 Parent_Installed : in out Boolean)
3711 Loc : constant Source_Ptr := Sloc (Gen_Id);
3712 Gen_Par : Entity_Id := Empty;
3713 Inst_Par : Entity_Id;
3717 function Find_Generic_Child
3721 -- Search generic parent for possible child unit.
3723 function In_Enclosing_Instance return Boolean;
3724 -- Within an instance of the parent, the child unit may be denoted
3725 -- by a simple name. Examine enclosing scopes to locate a possible
3726 -- parent instantiation.
3728 function Find_Generic_Child
3736 -- If entity of name is already set, instance has already been
3737 -- resolved, e.g. in an enclosing instantiation.
3739 if Present (Entity (Id)) then
3740 if Scope (Entity (Id)) = Scop then
3747 E := First_Entity (Scop);
3748 while Present (E) loop
3749 if Chars (E) = Chars (Id)
3750 and then Is_Child_Unit (E)
3752 if Is_Child_Unit (E)
3753 and then not Is_Visible_Child_Unit (E)
3756 ("generic child unit& is not visible", Gen_Id, E);
3768 end Find_Generic_Child;
3770 function In_Enclosing_Instance return Boolean is
3771 Enclosing_Instance : Node_Id;
3774 Enclosing_Instance := Current_Scope;
3776 while Present (Enclosing_Instance) loop
3777 exit when Ekind (Enclosing_Instance) = E_Package
3778 and then Nkind (Parent (Enclosing_Instance)) =
3779 N_Package_Specification
3781 (Generic_Parent (Parent (Enclosing_Instance)));
3783 Enclosing_Instance := Scope (Enclosing_Instance);
3786 if Present (Enclosing_Instance) then
3787 E := Find_Generic_Child
3788 (Generic_Parent (Parent (Enclosing_Instance)), Gen_Id);
3795 Make_Expanded_Name (Loc,
3797 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
3798 Selector_Name => New_Occurrence_Of (E, Loc)));
3800 Set_Entity (Gen_Id, E);
3801 Set_Etype (Gen_Id, Etype (E));
3802 Parent_Installed := False; -- Already in scope.
3808 end In_Enclosing_Instance;
3810 -- Start of processing for Check_Generic_Child_Unit
3813 -- If the name of the generic is given by a selected component, it
3814 -- may be the name of a generic child unit, and the prefix is the name
3815 -- of an instance of the parent, in which case the child unit must be
3816 -- visible. If this instance is not in scope, it must be placed there
3817 -- and removed after instantiation, because what is being instantiated
3818 -- is not the original child, but the corresponding child present in
3819 -- the instance of the parent.
3821 -- If the child is instantiated within the parent, it can be given by
3822 -- a simple name. In this case the instance is already in scope, but
3823 -- the child generic must be recovered from the generic parent as well.
3825 if Nkind (Gen_Id) = N_Selected_Component then
3826 S := Selector_Name (Gen_Id);
3827 Analyze (Prefix (Gen_Id));
3828 Inst_Par := Entity (Prefix (Gen_Id));
3830 if Ekind (Inst_Par) = E_Package
3831 and then Present (Renamed_Object (Inst_Par))
3833 Inst_Par := Renamed_Object (Inst_Par);
3836 if Ekind (Inst_Par) = E_Package then
3837 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
3838 Gen_Par := Generic_Parent (Parent (Inst_Par));
3840 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
3842 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
3844 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
3847 elsif Ekind (Inst_Par) = E_Generic_Package
3848 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
3851 -- A formal package may be a real child package, and not the
3852 -- implicit instance within a parent. In this case the child is
3853 -- not visible and has to be retrieved explicitly as well.
3855 Gen_Par := Inst_Par;
3858 if Present (Gen_Par) then
3860 -- The prefix denotes an instantiation. The entity itself
3861 -- may be a nested generic, or a child unit.
3863 E := Find_Generic_Child (Gen_Par, S);
3866 Change_Selected_Component_To_Expanded_Name (Gen_Id);
3867 Set_Entity (Gen_Id, E);
3868 Set_Etype (Gen_Id, Etype (E));
3870 Set_Etype (S, Etype (E));
3872 -- Indicate that this is a reference to the parent.
3874 if In_Extended_Main_Source_Unit (Gen_Id) then
3875 Set_Is_Instantiated (Inst_Par);
3878 -- A common mistake is to replicate the naming scheme of
3879 -- a hierarchy by instantiating a generic child directly,
3880 -- rather than the implicit child in a parent instance:
3882 -- generic .. package Gpar is ..
3883 -- generic .. package Gpar.Child is ..
3884 -- package Par is new Gpar ();
3887 -- package Par.Child is new Gpar.Child ();
3888 -- rather than Par.Child
3890 -- In this case the instantiation is within Par, which is
3891 -- an instance, but Gpar does not denote Par because we are
3892 -- not IN the instance of Gpar, so this is illegal. The test
3893 -- below recognizes this particular case.
3895 if Is_Child_Unit (E)
3896 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
3897 and then (not In_Instance
3898 or else Nkind (Parent (Parent (Gen_Id))) =
3902 ("prefix of generic child unit must be instance of parent",
3906 if not In_Open_Scopes (Inst_Par)
3907 and then Nkind (Parent (Gen_Id))
3908 not in N_Generic_Renaming_Declaration
3910 Install_Parent (Inst_Par);
3911 Parent_Installed := True;
3915 -- If the generic parent does not contain an entity that
3916 -- corresponds to the selector, the instance doesn't either.
3917 -- Analyzing the node will yield the appropriate error message.
3918 -- If the entity is not a child unit, then it is an inner
3919 -- generic in the parent.
3927 if Is_Child_Unit (Entity (Gen_Id))
3928 and then Nkind (Parent (Gen_Id))
3929 not in N_Generic_Renaming_Declaration
3930 and then not In_Open_Scopes (Inst_Par)
3932 Install_Parent (Inst_Par);
3933 Parent_Installed := True;
3937 elsif Nkind (Gen_Id) = N_Expanded_Name then
3939 -- Entity already present, analyze prefix, whose meaning may be
3940 -- an instance in the current context. If it is an instance of
3941 -- a relative within another, the proper parent may still have
3942 -- to be installed, if they are not of the same generation.
3944 Analyze (Prefix (Gen_Id));
3945 Inst_Par := Entity (Prefix (Gen_Id));
3947 if In_Enclosing_Instance then
3950 elsif Present (Entity (Gen_Id))
3951 and then Is_Child_Unit (Entity (Gen_Id))
3952 and then not In_Open_Scopes (Inst_Par)
3954 Install_Parent (Inst_Par);
3955 Parent_Installed := True;
3958 elsif In_Enclosing_Instance then
3959 -- The child unit is found in some enclosing scope.
3965 -- If this is the renaming of the implicit child in a parent
3966 -- instance, recover the parent name and install it.
3968 if Is_Entity_Name (Gen_Id) then
3969 E := Entity (Gen_Id);
3971 if Is_Generic_Unit (E)
3972 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
3973 and then Is_Child_Unit (Renamed_Object (E))
3974 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
3975 and then Nkind (Name (Parent (E))) = N_Expanded_Name
3978 New_Copy_Tree (Name (Parent (E))));
3979 Inst_Par := Entity (Prefix (Gen_Id));
3981 if not In_Open_Scopes (Inst_Par) then
3982 Install_Parent (Inst_Par);
3983 Parent_Installed := True;
3986 -- If it is a child unit of a non-generic parent, it may be
3987 -- use-visible and given by a direct name. Install parent as
3990 elsif Is_Generic_Unit (E)
3991 and then Is_Child_Unit (E)
3993 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
3994 and then not Is_Generic_Unit (Scope (E))
3996 if not In_Open_Scopes (Scope (E)) then
3997 Install_Parent (Scope (E));
3998 Parent_Installed := True;
4003 end Check_Generic_Child_Unit;
4005 -----------------------------
4006 -- Check_Hidden_Child_Unit --
4007 -----------------------------
4009 procedure Check_Hidden_Child_Unit
4011 Gen_Unit : Entity_Id;
4012 Act_Decl_Id : Entity_Id)
4014 Gen_Id : Node_Id := Name (N);
4017 if Is_Child_Unit (Gen_Unit)
4018 and then Is_Child_Unit (Act_Decl_Id)
4019 and then Nkind (Gen_Id) = N_Expanded_Name
4020 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4021 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4023 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4025 ("generic unit & is implicitly declared in &",
4026 Defining_Unit_Name (N), Gen_Unit);
4027 Error_Msg_N ("\instance must have different name",
4028 Defining_Unit_Name (N));
4030 end Check_Hidden_Child_Unit;
4032 ------------------------
4033 -- Check_Private_View --
4034 ------------------------
4036 procedure Check_Private_View (N : Node_Id) is
4037 T : constant Entity_Id := Etype (N);
4041 -- Exchange views if the type was not private in the generic but is
4042 -- private at the point of instantiation. Do not exchange views if
4043 -- the scope of the type is in scope. This can happen if both generic
4044 -- and instance are sibling units, or if type is defined in a parent.
4045 -- In this case the visibility of the type will be correct for all
4049 BT := Base_Type (T);
4051 if Is_Private_Type (T)
4052 and then not Has_Private_View (N)
4053 and then Present (Full_View (T))
4054 and then not In_Open_Scopes (Scope (T))
4056 -- In the generic, the full type was visible. Save the
4057 -- private entity, for subsequent exchange.
4061 elsif Has_Private_View (N)
4062 and then not Is_Private_Type (T)
4063 and then not Has_Been_Exchanged (T)
4064 and then Etype (Get_Associated_Node (N)) /= T
4066 -- Only the private declaration was visible in the generic. If
4067 -- the type appears in a subtype declaration, the subtype in the
4068 -- instance must have a view compatible with that of its parent,
4069 -- which must be exchanged (see corresponding code in Restore_
4070 -- Private_Views). Otherwise, if the type is defined in a parent
4071 -- unit, leave full visibility within instance, which is safe.
4073 if In_Open_Scopes (Scope (Base_Type (T)))
4074 and then not Is_Private_Type (Base_Type (T))
4075 and then Comes_From_Source (Base_Type (T))
4079 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4080 or else not In_Private_Part (Scope (Base_Type (T)))
4082 Append_Elmt (T, Exchanged_Views);
4083 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4086 -- For composite types with inconsistent representation
4087 -- exchange component types accordingly.
4089 elsif Is_Access_Type (T)
4090 and then Is_Private_Type (Designated_Type (T))
4091 and then Present (Full_View (Designated_Type (T)))
4093 Switch_View (Designated_Type (T));
4095 elsif Is_Array_Type (T)
4096 and then Is_Private_Type (Component_Type (T))
4097 and then not Has_Private_View (N)
4098 and then Present (Full_View (Component_Type (T)))
4100 Switch_View (Component_Type (T));
4102 elsif Is_Private_Type (T)
4103 and then Present (Full_View (T))
4104 and then Is_Array_Type (Full_View (T))
4105 and then Is_Private_Type (Component_Type (Full_View (T)))
4109 -- Finally, a non-private subtype may have a private base type,
4110 -- which must be exchanged for consistency. This can happen when
4111 -- instantiating a package body, when the scope stack is empty but
4112 -- in fact the subtype and the base type are declared in an enclosing
4115 elsif not Is_Private_Type (T)
4116 and then not Has_Private_View (N)
4117 and then Is_Private_Type (Base_Type (T))
4118 and then Present (Full_View (BT))
4119 and then not Is_Generic_Type (BT)
4120 and then not In_Open_Scopes (BT)
4122 Append_Elmt (Full_View (BT), Exchanged_Views);
4123 Exchange_Declarations (BT);
4126 end Check_Private_View;
4128 --------------------------
4129 -- Contains_Instance_Of --
4130 --------------------------
4132 function Contains_Instance_Of
4144 -- Verify that there are no circular instantiations. We check whether
4145 -- the unit contains an instance of the current scope or some enclosing
4146 -- scope (in case one of the instances appears in a subunit). Longer
4147 -- circularities involving subunits might seem too pathological to
4148 -- consider, but they were not too pathological for the authors of
4149 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4150 -- enclosing generic scopes as containing an instance.
4153 -- Within a generic subprogram body, the scope is not generic, to
4154 -- allow for recursive subprograms. Use the declaration to determine
4155 -- whether this is a generic unit.
4157 if Ekind (Scop) = E_Generic_Package
4158 or else (Is_Subprogram (Scop)
4159 and then Nkind (Unit_Declaration_Node (Scop)) =
4160 N_Generic_Subprogram_Declaration)
4162 Elmt := First_Elmt (Inner_Instances (Inner));
4164 while Present (Elmt) loop
4165 if Node (Elmt) = Scop then
4166 Error_Msg_Node_2 := Inner;
4168 ("circular Instantiation: & instantiated within &!",
4172 elsif Node (Elmt) = Inner then
4175 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4176 Error_Msg_Node_2 := Inner;
4178 ("circular Instantiation: & instantiated within &!",
4186 -- Indicate that Inner is being instantiated within Scop.
4188 Append_Elmt (Inner, Inner_Instances (Scop));
4191 if Scop = Standard_Standard then
4194 Scop := Scope (Scop);
4199 end Contains_Instance_Of;
4201 -----------------------
4202 -- Copy_Generic_Node --
4203 -----------------------
4205 function Copy_Generic_Node
4207 Parent_Id : Node_Id;
4208 Instantiating : Boolean)
4214 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4215 -- Check the given value of one of the Fields referenced by the
4216 -- current node to determine whether to copy it recursively. The
4217 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4218 -- value (Sloc, Uint, Char) in which case it need not be copied.
4220 procedure Copy_Descendants;
4221 -- Common utility for various nodes.
4223 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4224 -- Make copy of element list.
4226 function Copy_Generic_List
4228 Parent_Id : Node_Id)
4230 -- Apply Copy_Node recursively to the members of a node list.
4232 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4233 -- True if an identifier is part of the defining program unit name
4234 -- of a child unit. The entity of such an identifier must be kept
4235 -- (for ASIS use) even though as the name of an enclosing generic
4236 -- it would otherwise not be preserved in the generic tree.
4238 -----------------------
4239 -- Copy_Descendants --
4240 -----------------------
4242 procedure Copy_Descendants is
4244 use Atree.Unchecked_Access;
4245 -- This code section is part of the implementation of an untyped
4246 -- tree traversal, so it needs direct access to node fields.
4249 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4250 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4251 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4252 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4253 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4254 end Copy_Descendants;
4256 -----------------------------
4257 -- Copy_Generic_Descendant --
4258 -----------------------------
4260 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4262 if D = Union_Id (Empty) then
4265 elsif D in Node_Range then
4267 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4269 elsif D in List_Range then
4270 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4272 elsif D in Elist_Range then
4273 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4275 -- Nothing else is copyable (e.g. Uint values), return as is
4280 end Copy_Generic_Descendant;
4282 ------------------------
4283 -- Copy_Generic_Elist --
4284 ------------------------
4286 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4293 M := First_Elmt (E);
4294 while Present (M) loop
4296 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4305 end Copy_Generic_Elist;
4307 -----------------------
4308 -- Copy_Generic_List --
4309 -----------------------
4311 function Copy_Generic_List
4313 Parent_Id : Node_Id)
4322 Set_Parent (New_L, Parent_Id);
4325 while Present (N) loop
4326 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4335 end Copy_Generic_List;
4337 ---------------------------
4338 -- In_Defining_Unit_Name --
4339 ---------------------------
4341 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4343 return Present (Parent (Nam))
4344 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4346 (Nkind (Parent (Nam)) = N_Expanded_Name
4347 and then In_Defining_Unit_Name (Parent (Nam))));
4348 end In_Defining_Unit_Name;
4350 -- Start of processing for Copy_Generic_Node
4357 New_N := New_Copy (N);
4359 if Instantiating then
4360 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4363 if not Is_List_Member (N) then
4364 Set_Parent (New_N, Parent_Id);
4367 -- If defining identifier, then all fields have been copied already
4369 if Nkind (New_N) in N_Entity then
4372 -- Special casing for identifiers and other entity names and operators
4374 elsif (Nkind (New_N) = N_Identifier
4375 or else Nkind (New_N) = N_Character_Literal
4376 or else Nkind (New_N) = N_Expanded_Name
4377 or else Nkind (New_N) = N_Operator_Symbol
4378 or else Nkind (New_N) in N_Op)
4380 if not Instantiating then
4382 -- Link both nodes in order to assign subsequently the
4383 -- entity of the copy to the original node, in case this
4384 -- is a global reference.
4386 Set_Associated_Node (N, New_N);
4388 -- If we are within an instantiation, this is a nested generic
4389 -- that has already been analyzed at the point of definition. We
4390 -- must preserve references that were global to the enclosing
4391 -- parent at that point. Other occurrences, whether global or
4392 -- local to the current generic, must be resolved anew, so we
4393 -- reset the entity in the generic copy. A global reference has
4394 -- a smaller depth than the parent, or else the same depth in
4395 -- case both are distinct compilation units.
4397 -- It is also possible for Current_Instantiated_Parent to be
4398 -- defined, and for this not to be a nested generic, namely
4399 -- if the unit is loaded through Rtsfind. In that case, the
4400 -- entity of New_N is only a link to the associated node, and
4401 -- not a defining occurrence.
4403 -- The entities for parent units in the defining_program_unit
4404 -- of a generic child unit are established when the context of
4405 -- the unit is first analyzed, before the generic copy is made.
4406 -- They are preserved in the copy for use in ASIS queries.
4408 Ent := Entity (New_N);
4410 if No (Current_Instantiated_Parent.Gen_Id) then
4412 or else Nkind (Ent) /= N_Defining_Identifier
4413 or else not In_Defining_Unit_Name (N)
4415 Set_Associated_Node (New_N, Empty);
4420 not (Nkind (Ent) = N_Defining_Identifier
4422 Nkind (Ent) = N_Defining_Character_Literal
4424 Nkind (Ent) = N_Defining_Operator_Symbol)
4425 or else No (Scope (Ent))
4426 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4427 or else (Scope_Depth (Scope (Ent)) >
4428 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4430 Get_Source_Unit (Ent) =
4431 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4433 Set_Associated_Node (New_N, Empty);
4436 -- Case of instantiating identifier or some other name or operator
4439 -- If the associated node is still defined, the entity in
4440 -- it is global, and must be copied to the instance.
4442 if Present (Get_Associated_Node (N)) then
4443 if Nkind (Get_Associated_Node (N)) = Nkind (N) then
4444 Set_Entity (New_N, Entity (Get_Associated_Node (N)));
4445 Check_Private_View (N);
4447 elsif Nkind (Get_Associated_Node (N)) = N_Function_Call then
4448 Set_Entity (New_N, Entity (Name (Get_Associated_Node (N))));
4451 Set_Entity (New_N, Empty);
4456 -- For expanded name, we must copy the Prefix and Selector_Name
4458 if Nkind (N) = N_Expanded_Name then
4461 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4463 Set_Selector_Name (New_N,
4464 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4466 -- For operators, we must copy the right operand
4468 elsif Nkind (N) in N_Op then
4470 Set_Right_Opnd (New_N,
4471 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4473 -- And for binary operators, the left operand as well
4475 if Nkind (N) in N_Binary_Op then
4476 Set_Left_Opnd (New_N,
4477 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4481 -- Special casing for stubs
4483 elsif Nkind (N) in N_Body_Stub then
4485 -- In any case, we must copy the specification or defining
4486 -- identifier as appropriate.
4488 if Nkind (N) = N_Subprogram_Body_Stub then
4489 Set_Specification (New_N,
4490 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4493 Set_Defining_Identifier (New_N,
4495 (Defining_Identifier (N), New_N, Instantiating));
4498 -- If we are not instantiating, then this is where we load and
4499 -- analyze subunits, i.e. at the point where the stub occurs. A
4500 -- more permissivle system might defer this analysis to the point
4501 -- of instantiation, but this seems to complicated for now.
4503 if not Instantiating then
4505 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4507 Unum : Unit_Number_Type;
4513 (Load_Name => Subunit_Name,
4518 -- If the proper body is not found, a warning message will
4519 -- be emitted when analyzing the stub, or later at the the
4520 -- point of instantiation. Here we just leave the stub as is.
4522 if Unum = No_Unit then
4523 Subunits_Missing := True;
4524 goto Subunit_Not_Found;
4527 Subunit := Cunit (Unum);
4529 -- We must create a generic copy of the subunit, in order
4530 -- to perform semantic analysis on it, and we must replace
4531 -- the stub in the original generic unit with the subunit,
4532 -- in order to preserve non-local references within.
4534 -- Only the proper body needs to be copied. Library_Unit and
4535 -- context clause are simply inherited by the generic copy.
4536 -- Note that the copy (which may be recursive if there are
4537 -- nested subunits) must be done first, before attaching it
4538 -- to the enclosing generic.
4542 (Proper_Body (Unit (Subunit)),
4543 Empty, Instantiating => False);
4545 -- Now place the original proper body in the original
4546 -- generic unit. This is a body, not a compilation unit.
4548 Rewrite (N, Proper_Body (Unit (Subunit)));
4549 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4550 Set_Was_Originally_Stub (N);
4552 -- Finally replace the body of the subunit with its copy,
4553 -- and make this new subunit into the library unit of the
4554 -- generic copy, which does not have stubs any longer.
4556 Set_Proper_Body (Unit (Subunit), New_Body);
4557 Set_Library_Unit (New_N, Subunit);
4558 Inherit_Context (Unit (Subunit), N);
4562 -- If we are instantiating, this must be an error case, since
4563 -- otherwise we would have replaced the stub node by the proper
4564 -- body that corresponds. So just ignore it in the copy (i.e.
4565 -- we have copied it, and that is good enough).
4571 <<Subunit_Not_Found>> null;
4573 -- If the node is a compilation unit, it is the subunit of a stub,
4574 -- which has been loaded already (see code below). In this case,
4575 -- the library unit field of N points to the parent unit (which
4576 -- is a compilation unit) and need not (and cannot!) be copied.
4578 -- When the proper body of the stub is analyzed, thie library_unit
4579 -- link is used to establish the proper context (see sem_ch10).
4581 -- The other fields of a compilation unit are copied as usual
4583 elsif Nkind (N) = N_Compilation_Unit then
4585 -- This code can only be executed when not instantiating, because
4586 -- in the copy made for an instantiation, the compilation unit
4587 -- node has disappeared at the point that a stub is replaced by
4590 pragma Assert (not Instantiating);
4592 Set_Context_Items (New_N,
4593 Copy_Generic_List (Context_Items (N), New_N));
4596 Copy_Generic_Node (Unit (N), New_N, False));
4598 Set_First_Inlined_Subprogram (New_N,
4600 (First_Inlined_Subprogram (N), New_N, False));
4602 Set_Aux_Decls_Node (New_N,
4603 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4605 -- For an assignment node, the assignment is known to be semantically
4606 -- legal if we are instantiating the template. This avoids incorrect
4607 -- diagnostics in generated code.
4609 elsif Nkind (N) = N_Assignment_Statement then
4611 -- Copy name and expression fields in usual manner
4614 Copy_Generic_Node (Name (N), New_N, Instantiating));
4616 Set_Expression (New_N,
4617 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4619 if Instantiating then
4620 Set_Assignment_OK (Name (New_N), True);
4623 elsif Nkind (N) = N_Aggregate
4624 or else Nkind (N) = N_Extension_Aggregate
4627 if not Instantiating then
4628 Set_Associated_Node (N, New_N);
4631 if Present (Get_Associated_Node (N))
4632 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4634 -- In the generic the aggregate has some composite type.
4635 -- If at the point of instantiation the type has a private
4636 -- view, install the full view (and that of its ancestors,
4640 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4645 and then Is_Private_Type (T)
4651 and then Is_Tagged_Type (T)
4652 and then Is_Derived_Type (T)
4654 Rt := Root_Type (T);
4659 if Is_Private_Type (T) then
4670 -- Do not copy the associated node, which points to
4671 -- the generic copy of the aggregate.
4674 use Atree.Unchecked_Access;
4675 -- This code section is part of the implementation of an untyped
4676 -- tree traversal, so it needs direct access to node fields.
4679 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4680 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4681 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4682 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4685 -- Allocators do not have an identifier denoting the access type,
4686 -- so we must locate it through the expression to check whether
4687 -- the views are consistent.
4689 elsif Nkind (N) = N_Allocator
4690 and then Nkind (Expression (N)) = N_Qualified_Expression
4691 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
4692 and then Instantiating
4695 T : Node_Id := Get_Associated_Node (Subtype_Mark (Expression (N)));
4700 -- Retrieve the allocator node in the generic copy.
4702 Acc_T := Etype (Parent (Parent (T)));
4704 and then Is_Private_Type (Acc_T)
4706 Switch_View (Acc_T);
4713 -- For a proper body, we must catch the case of a proper body that
4714 -- replaces a stub. This represents the point at which a separate
4715 -- compilation unit, and hence template file, may be referenced, so
4716 -- we must make a new source instantiation entry for the template
4717 -- of the subunit, and ensure that all nodes in the subunit are
4718 -- adjusted using this new source instantiation entry.
4720 elsif Nkind (N) in N_Proper_Body then
4723 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4726 if Instantiating and then Was_Originally_Stub (N) then
4727 Create_Instantiation_Source
4728 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4731 -- Now copy the fields of the proper body, using the new
4732 -- adjustment factor if one was needed as per test above.
4736 -- Restore the original adjustment factor in case changed
4738 S_Adjustment := Save_Adjustment;
4741 -- Don't copy Ident or Comment pragmas, since the comment belongs
4742 -- to the generic unit, not to the instantiating unit.
4744 elsif Nkind (N) = N_Pragma
4745 and then Instantiating
4748 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4751 if Prag_Id = Pragma_Ident
4752 or else Prag_Id = Pragma_Comment
4754 New_N := Make_Null_Statement (Sloc (N));
4761 -- For the remaining nodes, copy recursively their descendants.
4767 and then Nkind (N) = N_Subprogram_Body
4769 Set_Generic_Parent (Specification (New_N), N);
4774 end Copy_Generic_Node;
4776 ----------------------------
4777 -- Denotes_Formal_Package --
4778 ----------------------------
4780 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4781 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4782 Scop : Entity_Id := Scope (Pack);
4786 if Ekind (Scop) = E_Generic_Package
4787 or else Nkind (Unit_Declaration_Node (Scop))
4788 = N_Generic_Subprogram_Declaration
4792 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4799 -- Check whether this package is associated with a formal
4800 -- package of the enclosing instantiation. Iterate over the
4801 -- list of renamings.
4803 E := First_Entity (Par);
4804 while Present (E) loop
4806 if Ekind (E) /= E_Package
4807 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4810 elsif Renamed_Object (E) = Par then
4813 elsif Renamed_Object (E) = Pack then
4822 end Denotes_Formal_Package;
4828 procedure End_Generic is
4830 -- ??? More things could be factored out in this
4831 -- routine. Should probably be done at a later stage.
4833 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4834 Generic_Flags.Decrement_Last;
4836 Expander_Mode_Restore;
4839 ----------------------
4840 -- Find_Actual_Type --
4841 ----------------------
4843 function Find_Actual_Type
4845 Gen_Scope : Entity_Id)
4851 if not Is_Child_Unit (Gen_Scope) then
4852 return Get_Instance_Of (Typ);
4854 elsif not Is_Generic_Type (Typ)
4855 or else Scope (Typ) = Gen_Scope
4857 return Get_Instance_Of (Typ);
4860 T := Current_Entity (Typ);
4861 while Present (T) loop
4862 if In_Open_Scopes (Scope (T)) then
4871 end Find_Actual_Type;
4873 ----------------------------
4874 -- Freeze_Subprogram_Body --
4875 ----------------------------
4877 procedure Freeze_Subprogram_Body
4878 (Inst_Node : Node_Id;
4880 Pack_Id : Entity_Id)
4883 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
4884 Par : constant Entity_Id := Scope (Gen_Unit);
4889 function Earlier (N1, N2 : Node_Id) return Boolean;
4890 -- Yields True if N1 and N2 appear in the same compilation unit,
4891 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4892 -- traversal of the tree for the unit.
4894 function Enclosing_Body (N : Node_Id) return Node_Id;
4895 -- Find innermost package body that encloses the given node, and which
4896 -- is not a compilation unit. Freeze nodes for the instance, or for its
4897 -- enclosing body, may be inserted after the enclosing_body of the
4900 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4901 -- Find entity for given package body, and locate or create a freeze
4904 function True_Parent (N : Node_Id) return Node_Id;
4905 -- For a subunit, return parent of corresponding stub.
4911 function Earlier (N1, N2 : Node_Id) return Boolean is
4917 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4918 -- Find distance from given node to enclosing compilation unit.
4920 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4923 and then Nkind (P) /= N_Compilation_Unit
4925 P := True_Parent (P);
4931 Find_Depth (P1, D1);
4932 Find_Depth (P2, D2);
4942 P1 := True_Parent (P1);
4947 P2 := True_Parent (P2);
4951 -- At this point P1 and P2 are at the same distance from the root.
4952 -- We examine their parents until we find a common declarative
4953 -- list, at which point we can establish their relative placement
4954 -- by comparing their ultimate slocs. If we reach the root,
4955 -- N1 and N2 do not descend from the same declarative list (e.g.
4956 -- one is nested in the declarative part and the other is in a block
4957 -- in the statement part) and the earlier one is already frozen.
4959 while not Is_List_Member (P1)
4960 or else not Is_List_Member (P2)
4961 or else List_Containing (P1) /= List_Containing (P2)
4963 P1 := True_Parent (P1);
4964 P2 := True_Parent (P2);
4966 if Nkind (Parent (P1)) = N_Subunit then
4967 P1 := Corresponding_Stub (Parent (P1));
4970 if Nkind (Parent (P2)) = N_Subunit then
4971 P2 := Corresponding_Stub (Parent (P2));
4980 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4983 --------------------
4984 -- Enclosing_Body --
4985 --------------------
4987 function Enclosing_Body (N : Node_Id) return Node_Id is
4988 P : Node_Id := Parent (N);
4992 and then Nkind (Parent (P)) /= N_Compilation_Unit
4994 if Nkind (P) = N_Package_Body then
4996 if Nkind (Parent (P)) = N_Subunit then
4997 return Corresponding_Stub (Parent (P));
5003 P := True_Parent (P);
5009 -------------------------
5010 -- Package_Freeze_Node --
5011 -------------------------
5013 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5017 if Nkind (B) = N_Package_Body then
5018 Id := Corresponding_Spec (B);
5020 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5021 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5024 Ensure_Freeze_Node (Id);
5025 return Freeze_Node (Id);
5026 end Package_Freeze_Node;
5032 function True_Parent (N : Node_Id) return Node_Id is
5034 if Nkind (Parent (N)) = N_Subunit then
5035 return Parent (Corresponding_Stub (Parent (N)));
5041 -- Start of processing of Freeze_Subprogram_Body
5044 -- If the instance and the generic body appear within the same
5045 -- unit, and the instance precedes the generic, the freeze node for
5046 -- the instance must appear after that of the generic. If the generic
5047 -- is nested within another instance I2, then current instance must
5048 -- be frozen after I2. In both cases, the freeze nodes are those of
5049 -- enclosing packages. Otherwise, the freeze node is placed at the end
5050 -- of the current declarative part.
5052 Enc_G := Enclosing_Body (Gen_Body);
5053 Enc_I := Enclosing_Body (Inst_Node);
5054 Ensure_Freeze_Node (Pack_Id);
5055 F_Node := Freeze_Node (Pack_Id);
5057 if Is_Generic_Instance (Par)
5058 and then Present (Freeze_Node (Par))
5060 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5062 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5063 -- The parent was a premature instantiation. Insert freeze
5064 -- node at the end the current declarative part.
5066 Insert_After_Last_Decl (Inst_Node, F_Node);
5069 Insert_After (Freeze_Node (Par), F_Node);
5072 -- The body enclosing the instance should be frozen after the body
5073 -- that includes the generic, because the body of the instance may
5074 -- make references to entities therein. If the two are not in the
5075 -- same declarative part, or if the one enclosing the instance is
5076 -- frozen already, freeze the instance at the end of the current
5077 -- declarative part.
5079 elsif Is_Generic_Instance (Par)
5080 and then Present (Freeze_Node (Par))
5081 and then Present (Enc_I)
5083 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5085 (Nkind (Enc_I) = N_Package_Body
5087 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5090 -- The enclosing package may contain several instances. Rather
5091 -- than computing the earliest point at which to insert its
5092 -- freeze node, we place it at the end of the declarative part
5093 -- of the parent of the generic.
5095 Insert_After_Last_Decl
5096 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5099 Insert_After_Last_Decl (Inst_Node, F_Node);
5101 elsif Present (Enc_G)
5102 and then Present (Enc_I)
5103 and then Enc_G /= Enc_I
5104 and then Earlier (Inst_Node, Gen_Body)
5106 if Nkind (Enc_G) = N_Package_Body then
5107 E_G_Id := Corresponding_Spec (Enc_G);
5108 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5110 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5113 -- Freeze package that encloses instance, and place node after
5114 -- package that encloses generic. If enclosing package is already
5115 -- frozen we have to assume it is at the proper place. This may
5116 -- be a potential ABE that requires dynamic checking.
5118 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5120 -- Freeze enclosing subunit before instance
5122 Ensure_Freeze_Node (E_G_Id);
5124 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5125 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5128 Insert_After_Last_Decl (Inst_Node, F_Node);
5132 -- If none of the above, insert freeze node at the end of the
5133 -- current declarative part.
5135 Insert_After_Last_Decl (Inst_Node, F_Node);
5137 end Freeze_Subprogram_Body;
5143 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5145 return Generic_Renamings.Table (E).Gen_Id;
5148 ---------------------
5149 -- Get_Instance_Of --
5150 ---------------------
5152 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5153 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5155 if Res /= Assoc_Null then
5156 return Generic_Renamings.Table (Res).Act_Id;
5158 -- On exit, entity is not instantiated: not a generic parameter,
5159 -- or else parameter of an inner generic unit.
5163 end Get_Instance_Of;
5165 ------------------------------------
5166 -- Get_Package_Instantiation_Node --
5167 ------------------------------------
5169 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5170 Decl : Node_Id := Unit_Declaration_Node (A);
5174 -- If the instantiation is a compilation unit that does not need a
5175 -- body then the instantiation node has been rewritten as a package
5176 -- declaration for the instance, and we return the original node.
5178 -- If it is a compilation unit and the instance node has not been
5179 -- rewritten, then it is still the unit of the compilation. Finally,
5180 -- if a body is present, this is a parent of the main unit whose body
5181 -- has been compiled for inlining purposes, and the instantiation node
5182 -- has been rewritten with the instance body.
5184 -- Otherwise the instantiation node appears after the declaration.
5185 -- If the entity is a formal package, the declaration may have been
5186 -- rewritten as a generic declaration (in the case of a formal with a
5187 -- box) or left as a formal package declaration if it has actuals, and
5188 -- is found with a forward search.
5190 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5191 if Nkind (Decl) = N_Package_Declaration
5192 and then Present (Corresponding_Body (Decl))
5194 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5197 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5198 return Original_Node (Decl);
5200 return Unit (Parent (Decl));
5203 elsif Nkind (Decl) = N_Generic_Package_Declaration
5204 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5206 return Original_Node (Decl);
5209 Inst := Next (Decl);
5210 while Nkind (Inst) /= N_Package_Instantiation
5211 and then Nkind (Inst) /= N_Formal_Package_Declaration
5218 end Get_Package_Instantiation_Node;
5220 ------------------------
5221 -- Has_Been_Exchanged --
5222 ------------------------
5224 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5225 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5228 while Present (Next) loop
5229 if Full_View (Node (Next)) = E then
5237 end Has_Been_Exchanged;
5243 function Hash (F : Entity_Id) return HTable_Range is
5245 return HTable_Range (F mod HTable_Size);
5248 ------------------------
5249 -- Hide_Current_Scope --
5250 ------------------------
5252 procedure Hide_Current_Scope is
5253 C : constant Entity_Id := Current_Scope;
5257 Set_Is_Hidden_Open_Scope (C);
5258 E := First_Entity (C);
5260 while Present (E) loop
5261 if Is_Immediately_Visible (E) then
5262 Set_Is_Immediately_Visible (E, False);
5263 Append_Elmt (E, Hidden_Entities);
5269 -- Make the scope name invisible as well. This is necessary, but
5270 -- might conflict with calls to Rtsfind later on, in case the scope
5271 -- is a predefined one. There is no clean solution to this problem, so
5272 -- for now we depend on the user not redefining Standard itself in one
5273 -- of the parent units.
5275 if Is_Immediately_Visible (C)
5276 and then C /= Standard_Standard
5278 Set_Is_Immediately_Visible (C, False);
5279 Append_Elmt (C, Hidden_Entities);
5282 end Hide_Current_Scope;
5284 ------------------------------
5285 -- In_Same_Declarative_Part --
5286 ------------------------------
5288 function In_Same_Declarative_Part
5293 Decls : Node_Id := Parent (F_Node);
5294 Nod : Node_Id := Parent (Inst);
5297 while Present (Nod) loop
5301 elsif Nkind (Nod) = N_Subprogram_Body
5302 or else Nkind (Nod) = N_Package_Body
5303 or else Nkind (Nod) = N_Task_Body
5304 or else Nkind (Nod) = N_Protected_Body
5305 or else Nkind (Nod) = N_Block_Statement
5309 elsif Nkind (Nod) = N_Subunit then
5310 Nod := Corresponding_Stub (Nod);
5312 elsif Nkind (Nod) = N_Compilation_Unit then
5315 Nod := Parent (Nod);
5320 end In_Same_Declarative_Part;
5322 ---------------------
5323 -- Inherit_Context --
5324 ---------------------
5326 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5327 Current_Context : List_Id;
5328 Current_Unit : Node_Id;
5333 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5335 -- The inherited context is attached to the enclosing compilation
5336 -- unit. This is either the main unit, or the declaration for the
5337 -- main unit (in case the instantiation appears within the package
5338 -- declaration and the main unit is its body).
5340 Current_Unit := Parent (Inst);
5341 while Present (Current_Unit)
5342 and then Nkind (Current_Unit) /= N_Compilation_Unit
5344 Current_Unit := Parent (Current_Unit);
5347 Current_Context := Context_Items (Current_Unit);
5349 Item := First (Context_Items (Parent (Gen_Decl)));
5350 while Present (Item) loop
5351 if Nkind (Item) = N_With_Clause then
5352 New_I := New_Copy (Item);
5353 Set_Implicit_With (New_I, True);
5354 Append (New_I, Current_Context);
5360 end Inherit_Context;
5362 ----------------------------
5363 -- Insert_After_Last_Decl --
5364 ----------------------------
5366 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5367 L : List_Id := List_Containing (N);
5368 P : Node_Id := Parent (L);
5371 if not Is_List_Member (F_Node) then
5372 if Nkind (P) = N_Package_Specification
5373 and then L = Visible_Declarations (P)
5374 and then Present (Private_Declarations (P))
5375 and then not Is_Empty_List (Private_Declarations (P))
5377 L := Private_Declarations (P);
5380 Insert_After (Last (L), F_Node);
5382 end Insert_After_Last_Decl;
5388 procedure Install_Body
5389 (Act_Body : Node_Id;
5394 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5395 Act_Unit : constant Node_Id :=
5396 Unit (Cunit (Get_Source_Unit (N)));
5398 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5399 Gen_Unit : constant Node_Id :=
5400 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5401 Orig_Body : Node_Id := Gen_Body;
5402 Par : constant Entity_Id := Scope (Gen_Id);
5403 Body_Unit : Node_Id;
5405 Must_Delay : Boolean;
5407 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5408 -- Find subprogram (if any) that encloses instance and/or generic body.
5410 function True_Sloc (N : Node_Id) return Source_Ptr;
5411 -- If the instance is nested inside a generic unit, the Sloc of the
5412 -- instance indicates the place of the original definition, not the
5413 -- point of the current enclosing instance. Pending a better usage of
5414 -- Slocs to indicate instantiation places, we determine the place of
5415 -- origin of a node by finding the maximum sloc of any ancestor node.
5416 -- Why is this not equivalent fo Top_Level_Location ???
5418 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5419 Scop : Entity_Id := Scope (Id);
5422 while Scop /= Standard_Standard
5423 and then not Is_Overloadable (Scop)
5425 Scop := Scope (Scop);
5431 function True_Sloc (N : Node_Id) return Source_Ptr is
5438 while Present (N1) and then N1 /= Act_Unit loop
5439 if Sloc (N1) > Res then
5449 -- Start of processing for Install_Body
5452 -- If the body is a subunit, the freeze point is the corresponding
5453 -- stub in the current compilation, not the subunit itself.
5455 if Nkind (Parent (Gen_Body)) = N_Subunit then
5456 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5458 Orig_Body := Gen_Body;
5461 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5463 -- If the instantiation and the generic definition appear in the
5464 -- same package declaration, this is an early instantiation.
5465 -- If they appear in the same declarative part, it is an early
5466 -- instantiation only if the generic body appears textually later,
5467 -- and the generic body is also in the main unit.
5469 -- If instance is nested within a subprogram, and the generic body is
5470 -- not, the instance is delayed because the enclosing body is. If
5471 -- instance and body are within the same scope, or the same sub-
5472 -- program body, indicate explicitly that the instance is delayed.
5475 (Gen_Unit = Act_Unit
5476 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5477 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5478 or else (Gen_Unit = Body_Unit
5479 and then True_Sloc (N) < Sloc (Orig_Body)))
5480 and then Is_In_Main_Unit (Gen_Unit)
5481 and then (Scope (Act_Id) = Scope (Gen_Id)
5483 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5485 -- If this is an early instantiation, the freeze node is placed after
5486 -- the generic body. Otherwise, if the generic appears in an instance,
5487 -- we cannot freeze the current instance until the outer one is frozen.
5488 -- This is only relevant if the current instance is nested within some
5489 -- inner scope not itself within the outer instance. If this scope is
5490 -- a package body in the same declarative part as the outer instance,
5491 -- then that body needs to be frozen after the outer instance. Finally,
5492 -- if no delay is needed, we place the freeze node at the end of the
5493 -- current declarative part.
5495 if Expander_Active then
5496 Ensure_Freeze_Node (Act_Id);
5497 F_Node := Freeze_Node (Act_Id);
5500 Insert_After (Orig_Body, F_Node);
5502 elsif Is_Generic_Instance (Par)
5503 and then Present (Freeze_Node (Par))
5504 and then Scope (Act_Id) /= Par
5506 -- Freeze instance of inner generic after instance of enclosing
5509 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5510 Insert_After (Freeze_Node (Par), F_Node);
5512 -- Freeze package enclosing instance of inner generic after
5513 -- instance of enclosing generic.
5515 elsif Nkind (Parent (N)) = N_Package_Body
5516 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5520 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5523 Insert_After_Last_Decl (N, F_Node);
5524 Ensure_Freeze_Node (Enclosing);
5526 if not Is_List_Member (Freeze_Node (Enclosing)) then
5527 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5532 Insert_After_Last_Decl (N, F_Node);
5536 Insert_After_Last_Decl (N, F_Node);
5540 Set_Is_Frozen (Act_Id);
5541 Insert_Before (N, Act_Body);
5542 Mark_Rewrite_Insertion (Act_Body);
5545 --------------------
5546 -- Install_Parent --
5547 --------------------
5549 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5550 S : Entity_Id := Current_Scope;
5551 Inst_Par : Entity_Id;
5552 First_Par : Entity_Id;
5553 Inst_Node : Node_Id;
5554 Gen_Par : Entity_Id;
5555 First_Gen : Entity_Id;
5556 Ancestors : Elist_Id := New_Elmt_List;
5559 procedure Install_Formal_Packages (Par : Entity_Id);
5560 -- If any of the formals of the parent are formal packages with box,
5561 -- their formal parts are visible in the parent and thus in the child
5562 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5563 -- for the unit itself.
5565 procedure Install_Noninstance_Specs (Par : Entity_Id);
5566 -- Install the scopes of noninstance parent units ending with Par.
5568 procedure Install_Spec (Par : Entity_Id);
5569 -- The child unit is within the declarative part of the parent, so
5570 -- the declarations within the parent are immediately visible.
5572 -----------------------------
5573 -- Install_Formal_Packages --
5574 -----------------------------
5576 procedure Install_Formal_Packages (Par : Entity_Id) is
5580 E := First_Entity (Par);
5582 while Present (E) loop
5584 if Ekind (E) = E_Package
5585 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5587 -- If this is the renaming for the parent instance, done.
5589 if Renamed_Object (E) = Par then
5592 -- The visibility of a formal of an enclosing generic is
5595 elsif Denotes_Formal_Package (E) then
5598 elsif Present (Associated_Formal_Package (E))
5599 and then Box_Present (Parent (Associated_Formal_Package (E)))
5601 Check_Generic_Actuals (Renamed_Object (E), True);
5602 Set_Is_Hidden (E, False);
5608 end Install_Formal_Packages;
5610 -------------------------------
5611 -- Install_Noninstance_Specs --
5612 -------------------------------
5614 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5617 and then Par /= Standard_Standard
5618 and then not In_Open_Scopes (Par)
5620 Install_Noninstance_Specs (Scope (Par));
5623 end Install_Noninstance_Specs;
5629 procedure Install_Spec (Par : Entity_Id) is
5630 Spec : constant Node_Id :=
5631 Specification (Unit_Declaration_Node (Par));
5635 Set_Is_Immediately_Visible (Par);
5636 Install_Visible_Declarations (Par);
5637 Install_Private_Declarations (Par);
5638 Set_Use (Visible_Declarations (Spec));
5639 Set_Use (Private_Declarations (Spec));
5642 -- Start of processing for Install_Parent
5645 -- We need to install the parent instance to compile the instantiation
5646 -- of the child, but the child instance must appear in the current
5647 -- scope. Given that we cannot place the parent above the current
5648 -- scope in the scope stack, we duplicate the current scope and unstack
5649 -- both after the instantiation is complete.
5651 -- If the parent is itself the instantiation of a child unit, we must
5652 -- also stack the instantiation of its parent, and so on. Each such
5653 -- ancestor is the prefix of the name in a prior instantiation.
5655 -- If this is a nested instance, the parent unit itself resolves to
5656 -- a renaming of the parent instance, whose declaration we need.
5658 -- Finally, the parent may be a generic (not an instance) when the
5659 -- child unit appears as a formal package.
5663 if Present (Renamed_Entity (Inst_Par)) then
5664 Inst_Par := Renamed_Entity (Inst_Par);
5667 First_Par := Inst_Par;
5670 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5672 First_Gen := Gen_Par;
5674 while Present (Gen_Par)
5675 and then Is_Child_Unit (Gen_Par)
5677 -- Load grandparent instance as well.
5679 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5681 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5682 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5684 if Present (Renamed_Entity (Inst_Par)) then
5685 Inst_Par := Renamed_Entity (Inst_Par);
5690 (Specification (Unit_Declaration_Node (Inst_Par)));
5692 if Present (Gen_Par) then
5693 Prepend_Elmt (Inst_Par, Ancestors);
5696 -- Parent is not the name of an instantiation.
5698 Install_Noninstance_Specs (Inst_Par);
5710 if Present (First_Gen) then
5711 Append_Elmt (First_Par, Ancestors);
5714 Install_Noninstance_Specs (First_Par);
5717 if not Is_Empty_Elmt_List (Ancestors) then
5718 Elmt := First_Elmt (Ancestors);
5720 while Present (Elmt) loop
5721 Install_Spec (Node (Elmt));
5722 Install_Formal_Packages (Node (Elmt));
5733 --------------------------------
5734 -- Instantiate_Formal_Package --
5735 --------------------------------
5737 function Instantiate_Formal_Package
5740 Analyzed_Formal : Node_Id)
5743 Loc : constant Source_Ptr := Sloc (Actual);
5744 Actual_Pack : Entity_Id;
5745 Formal_Pack : Entity_Id;
5746 Gen_Parent : Entity_Id;
5749 Parent_Spec : Node_Id;
5751 function Formal_Entity
5753 Act_Ent : Entity_Id)
5755 -- Returns the entity associated with the given formal F. In the
5756 -- case where F is a formal package, this function will iterate
5757 -- through all of F's formals and enter map associations from the
5758 -- actuals occurring in the formal package's corresponding actual
5759 -- package (obtained via Act_Ent) to the formal package's formal
5760 -- parameters. This function is called recursively for arbitrary
5761 -- levels of formal packages.
5763 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5764 -- Within the generic part, entities in the formal package are
5765 -- visible. To validate subsequent type declarations, indicate
5766 -- the correspondence betwen the entities in the analyzed formal,
5767 -- and the entities in the actual package. There are three packages
5768 -- involved in the instantiation of a formal package: the parent
5769 -- generic P1 which appears in the generic declaration, the fake
5770 -- instantiation P2 which appears in the analyzed generic, and whose
5771 -- visible entities may be used in subsequent formals, and the actual
5772 -- P3 in the instance. To validate subsequent formals, me indicate
5773 -- that the entities in P2 are mapped into those of P3. The mapping of
5774 -- entities has to be done recursively for nested packages.
5780 function Formal_Entity
5782 Act_Ent : Entity_Id)
5785 Orig_Node : Node_Id := F;
5789 when N_Formal_Object_Declaration =>
5790 return Defining_Identifier (F);
5792 when N_Formal_Type_Declaration =>
5793 return Defining_Identifier (F);
5795 when N_Formal_Subprogram_Declaration =>
5796 return Defining_Unit_Name (Specification (F));
5798 when N_Formal_Package_Declaration |
5799 N_Generic_Package_Declaration =>
5801 if Nkind (F) = N_Generic_Package_Declaration then
5802 Orig_Node := Original_Node (F);
5806 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5807 Formal_Node : Node_Id;
5808 Formal_Ent : Entity_Id;
5810 Gen_Decl : Node_Id :=
5811 Unit_Declaration_Node
5812 (Entity (Name (Orig_Node)));
5813 Formals : List_Id :=
5814 Generic_Formal_Declarations (Gen_Decl);
5817 if Present (Formals) then
5818 Formal_Node := First_Non_Pragma (Formals);
5820 Formal_Node := Empty;
5823 -- As for the loop further below, this loop is making
5824 -- a probably invalid assumption about the correspondence
5825 -- between formals and actuals and eventually needs to
5826 -- corrected to account for cases where the formals are
5827 -- not synchronized and in one-to-one correspondence
5828 -- with actuals. ???
5830 -- What is certain is that for a legal program the
5831 -- presence of actual entities guarantees the existing
5834 while Present (Actual_Ent)
5835 and then Present (Formal_Node)
5836 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5838 -- ??? Are the following calls also needed here:
5840 -- Set_Is_Hidden (Actual_Ent, False);
5841 -- Set_Is_Potentially_Use_Visible
5842 -- (Actual_Ent, In_Use (Act_Ent));
5844 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5845 if Present (Formal_Ent) then
5846 Set_Instance_Of (Formal_Ent, Actual_Ent);
5848 Next_Non_Pragma (Formal_Node);
5850 Next_Entity (Actual_Ent);
5854 return Defining_Identifier (Orig_Node);
5856 when N_Use_Package_Clause =>
5859 when N_Use_Type_Clause =>
5862 -- We return Empty for all other encountered forms of
5863 -- declarations because there are some cases of nonformal
5864 -- sorts of declaration that can show up (e.g., when array
5865 -- formals are present). Since it's not clear what kinds
5866 -- can appear among the formals, we won't raise failure here.
5878 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5883 Set_Instance_Of (Form, Act);
5885 E1 := First_Entity (Form);
5886 E2 := First_Entity (Act);
5888 and then E1 /= First_Private_Entity (Form)
5890 if not Is_Internal (E1)
5891 and then not Is_Class_Wide_Type (E1)
5895 and then Chars (E2) /= Chars (E1)
5903 Set_Instance_Of (E1, E2);
5906 and then Is_Tagged_Type (E2)
5909 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5912 if Ekind (E1) = E_Package
5913 and then No (Renamed_Object (E1))
5915 Map_Entities (E1, E2);
5924 -- Start of processing for Instantiate_Formal_Package
5929 if not Is_Entity_Name (Actual)
5930 or else Ekind (Entity (Actual)) /= E_Package
5933 ("expect package instance to instantiate formal", Actual);
5934 Abandon_Instantiation (Actual);
5935 raise Program_Error;
5938 Actual_Pack := Entity (Actual);
5939 Set_Is_Instantiated (Actual_Pack);
5941 -- The actual may be a renamed package, or an outer generic
5942 -- formal package whose instantiation is converted into a renaming.
5944 if Present (Renamed_Object (Actual_Pack)) then
5945 Actual_Pack := Renamed_Object (Actual_Pack);
5948 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5949 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5950 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5953 Generic_Parent (Specification (Analyzed_Formal));
5955 Defining_Unit_Name (Specification (Analyzed_Formal));
5958 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5959 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5961 Parent_Spec := Parent (Actual_Pack);
5964 if Gen_Parent = Any_Id then
5966 ("previous error in declaration of formal package", Actual);
5967 Abandon_Instantiation (Actual);
5970 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5973 ("actual parameter must be instance of&", Actual, Gen_Parent);
5974 Abandon_Instantiation (Actual);
5977 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5978 Map_Entities (Formal_Pack, Actual_Pack);
5981 Make_Package_Renaming_Declaration (Loc,
5982 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5983 Name => New_Reference_To (Actual_Pack, Loc));
5985 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5986 Defining_Identifier (Formal));
5987 Decls := New_List (Nod);
5989 -- If the formal F has a box, then the generic declarations are
5990 -- visible in the generic G. In an instance of G, the corresponding
5991 -- entities in the actual for F (which are the actuals for the
5992 -- instantiation of the generic that F denotes) must also be made
5993 -- visible for analysis of the current instance. On exit from the
5994 -- current instance, those entities are made private again. If the
5995 -- actual is currently in use, these entities are also use-visible.
5997 -- The loop through the actual entities also steps through the
5998 -- formal entities and enters associations from formals to
5999 -- actuals into the renaming map. This is necessary to properly
6000 -- handle checking of actual parameter associations for later
6001 -- formals that depend on actuals declared in the formal package.
6003 -- This processing needs to be reviewed at some point because
6004 -- it is probably not entirely correct as written. For example
6005 -- there may not be a strict one-to-one correspondence between
6006 -- actuals and formals and this loop is currently assuming that
6009 if Box_Present (Formal) then
6011 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
6012 Formal_Node : Node_Id := Empty;
6013 Formal_Ent : Entity_Id;
6014 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
6015 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
6018 if Present (Formals) then
6019 Formal_Node := First_Non_Pragma (Formals);
6022 while Present (Actual_Ent)
6023 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6025 Set_Is_Hidden (Actual_Ent, False);
6026 Set_Is_Potentially_Use_Visible
6027 (Actual_Ent, In_Use (Actual_Pack));
6029 if Present (Formal_Node) then
6030 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6032 if Present (Formal_Ent) then
6033 Set_Instance_Of (Formal_Ent, Actual_Ent);
6036 Next_Non_Pragma (Formal_Node);
6039 Next_Entity (Actual_Ent);
6043 -- If the formal is not declared with a box, reanalyze it as
6044 -- an instantiation, to verify the matching rules of 12.7. The
6045 -- actual checks are performed after the generic associations
6050 I_Pack : constant Entity_Id :=
6051 Make_Defining_Identifier (Sloc (Actual),
6052 Chars => New_Internal_Name ('P'));
6055 Set_Is_Internal (I_Pack);
6058 Make_Package_Instantiation (Sloc (Actual),
6059 Defining_Unit_Name => I_Pack,
6060 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6061 Generic_Associations =>
6062 Generic_Associations (Formal)));
6069 end Instantiate_Formal_Package;
6071 -----------------------------------
6072 -- Instantiate_Formal_Subprogram --
6073 -----------------------------------
6075 function Instantiate_Formal_Subprogram
6078 Analyzed_Formal : Node_Id)
6081 Loc : Source_Ptr := Sloc (Instantiation_Node);
6082 Formal_Sub : constant Entity_Id :=
6083 Defining_Unit_Name (Specification (Formal));
6084 Analyzed_S : constant Entity_Id :=
6085 Defining_Unit_Name (Specification (Analyzed_Formal));
6086 Decl_Node : Node_Id;
6090 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6091 -- If the generic is a child unit, the parent has been installed
6092 -- on the scope stack, but a default subprogram cannot resolve to
6093 -- something on the parent because that parent is not really part
6094 -- of the visible context (it is there to resolve explicit local
6095 -- entities). If the default has resolved in this way, we remove
6096 -- the entity from immediate visibility and analyze the node again
6097 -- to emit an error message or find another visible candidate.
6099 procedure Valid_Actual_Subprogram (Act : Node_Id);
6100 -- Perform legality check and raise exception on failure.
6102 -----------------------
6103 -- From_Parent_Scope --
6104 -----------------------
6106 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6107 Gen_Scope : Node_Id := Scope (Analyzed_S);
6110 while Present (Gen_Scope)
6111 and then Is_Child_Unit (Gen_Scope)
6113 if Scope (Subp) = Scope (Gen_Scope) then
6117 Gen_Scope := Scope (Gen_Scope);
6121 end From_Parent_Scope;
6123 -----------------------------
6124 -- Valid_Actual_Subprogram --
6125 -----------------------------
6127 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6129 if not Is_Entity_Name (Act)
6130 and then Nkind (Act) /= N_Operator_Symbol
6131 and then Nkind (Act) /= N_Attribute_Reference
6132 and then Nkind (Act) /= N_Selected_Component
6133 and then Nkind (Act) /= N_Indexed_Component
6134 and then Nkind (Act) /= N_Character_Literal
6135 and then Nkind (Act) /= N_Explicit_Dereference
6137 if Etype (Act) /= Any_Type then
6139 ("Expect subprogram name to instantiate &",
6140 Instantiation_Node, Formal_Sub);
6143 -- In any case, instantiation cannot continue.
6145 Abandon_Instantiation (Instantiation_Node);
6147 end Valid_Actual_Subprogram;
6149 -- Start of processing for Instantiate_Formal_Subprogram
6152 New_Spec := New_Copy_Tree (Specification (Formal));
6154 -- Create new entity for the actual (New_Copy_Tree does not).
6156 Set_Defining_Unit_Name
6157 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6159 -- Find entity of actual. If the actual is an attribute reference, it
6160 -- cannot be resolved here (its formal is missing) but is handled
6161 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6162 -- fully resolved subsequently, when the renaming declaration for the
6163 -- formal is analyzed. If it is an explicit dereference, resolve the
6164 -- prefix but not the actual itself, to prevent interpretation as a
6167 if Present (Actual) then
6168 Loc := Sloc (Actual);
6169 Set_Sloc (New_Spec, Loc);
6171 if Nkind (Actual) = N_Operator_Symbol then
6172 Find_Direct_Name (Actual);
6174 elsif Nkind (Actual) = N_Explicit_Dereference then
6175 Analyze (Prefix (Actual));
6177 elsif Nkind (Actual) /= N_Attribute_Reference then
6181 Valid_Actual_Subprogram (Actual);
6184 elsif Present (Default_Name (Formal)) then
6186 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6187 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6188 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6189 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6190 and then Present (Entity (Default_Name (Formal)))
6192 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6194 Nam := New_Copy (Default_Name (Formal));
6195 Set_Sloc (Nam, Loc);
6198 elsif Box_Present (Formal) then
6200 -- Actual is resolved at the point of instantiation. Create
6201 -- an identifier or operator with the same name as the formal.
6203 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6204 Nam := Make_Operator_Symbol (Loc,
6205 Chars => Chars (Formal_Sub),
6206 Strval => No_String);
6208 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6213 ("missing actual for instantiation of &",
6214 Instantiation_Node, Formal_Sub);
6215 Abandon_Instantiation (Instantiation_Node);
6219 Make_Subprogram_Renaming_Declaration (Loc,
6220 Specification => New_Spec,
6223 -- Gather possible interpretations for the actual before analyzing the
6224 -- instance. If overloaded, it will be resolved when analyzing the
6225 -- renaming declaration.
6227 if Box_Present (Formal)
6228 and then No (Actual)
6232 if Is_Child_Unit (Scope (Analyzed_S))
6233 and then Present (Entity (Nam))
6235 if not Is_Overloaded (Nam) then
6237 if From_Parent_Scope (Entity (Nam)) then
6238 Set_Is_Immediately_Visible (Entity (Nam), False);
6239 Set_Entity (Nam, Empty);
6240 Set_Etype (Nam, Empty);
6244 Set_Is_Immediately_Visible (Entity (Nam));
6253 Get_First_Interp (Nam, I, It);
6255 while Present (It.Nam) loop
6256 if From_Parent_Scope (It.Nam) then
6260 Get_Next_Interp (I, It);
6267 -- The generic instantiation freezes the actual. This can only be
6268 -- done once the actual is resolved, in the analysis of the renaming
6269 -- declaration. To indicate that must be done, we set the corresponding
6270 -- spec of the node to point to the formal subprogram declaration.
6272 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6274 -- We cannot analyze the renaming declaration, and thus find the
6275 -- actual, until the all the actuals are assembled in the instance.
6276 -- For subsequent checks of other actuals, indicate the node that
6277 -- will hold the instance of this formal.
6279 Set_Instance_Of (Analyzed_S, Nam);
6281 if Nkind (Actual) = N_Selected_Component
6282 and then Is_Task_Type (Etype (Prefix (Actual)))
6283 and then not Is_Frozen (Etype (Prefix (Actual)))
6285 -- The renaming declaration will create a body, which must appear
6286 -- outside of the instantiation, We move the renaming declaration
6287 -- out of the instance, and create an additional renaming inside,
6288 -- to prevent freezing anomalies.
6291 Anon_Id : constant Entity_Id :=
6292 Make_Defining_Identifier
6293 (Loc, New_Internal_Name ('E'));
6295 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6296 Insert_Before (Instantiation_Node, Decl_Node);
6297 Analyze (Decl_Node);
6299 -- Now create renaming within the instance.
6302 Make_Subprogram_Renaming_Declaration (Loc,
6303 Specification => New_Copy_Tree (New_Spec),
6304 Name => New_Occurrence_Of (Anon_Id, Loc));
6306 Set_Defining_Unit_Name (Specification (Decl_Node),
6307 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6312 end Instantiate_Formal_Subprogram;
6314 ------------------------
6315 -- Instantiate_Object --
6316 ------------------------
6318 function Instantiate_Object
6321 Analyzed_Formal : Node_Id)
6324 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6325 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6326 Loc : constant Source_Ptr := Sloc (Actual);
6327 Act_Assoc : constant Node_Id := Parent (Actual);
6328 Orig_Ftyp : constant Entity_Id :=
6329 Etype (Defining_Identifier (Analyzed_Formal));
6331 Decl_Node : Node_Id;
6332 Subt_Decl : Node_Id := Empty;
6333 List : List_Id := New_List;
6336 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6337 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6340 Set_Parent (List, Parent (Actual));
6344 if Out_Present (Formal) then
6346 -- An IN OUT generic actual must be a name. The instantiation is
6347 -- a renaming declaration. The actual is the name being renamed.
6348 -- We use the actual directly, rather than a copy, because it is not
6349 -- used further in the list of actuals, and because a copy or a use
6350 -- of relocate_node is incorrect if the instance is nested within
6351 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6352 -- field links the declaration to the generic association.
6356 ("missing actual for instantiation of &",
6357 Instantiation_Node, Formal_Id);
6358 Abandon_Instantiation (Instantiation_Node);
6362 Make_Object_Renaming_Declaration (Loc,
6363 Defining_Identifier => New_Copy (Formal_Id),
6364 Subtype_Mark => New_Copy_Tree (Type_Id),
6367 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6369 -- The analysis of the actual may produce insert_action nodes, so
6370 -- the declaration must have a context in which to attach them.
6372 Append (Decl_Node, List);
6375 -- This check is performed here because Analyze_Object_Renaming
6376 -- will not check it when Comes_From_Source is False. Note
6377 -- though that the check for the actual being the name of an
6378 -- object will be performed in Analyze_Object_Renaming.
6380 if Is_Object_Reference (Actual)
6381 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6384 ("illegal discriminant-dependent component for in out parameter",
6388 -- The actual has to be resolved in order to check that it is
6389 -- a variable (due to cases such as F(1), where F returns
6390 -- access to an array, and for overloaded prefixes).
6393 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6395 if Is_Private_Type (Ftyp)
6396 and then not Is_Private_Type (Etype (Actual))
6397 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6398 or else Base_Type (Etype (Actual)) = Ftyp)
6400 -- If the actual has the type of the full view of the formal,
6401 -- or else a non-private subtype of the formal, then
6402 -- the visibility of the formal type has changed. Add to the
6403 -- actuals a subtype declaration that will force the exchange
6404 -- of views in the body of the instance as well.
6407 Make_Subtype_Declaration (Loc,
6408 Defining_Identifier =>
6409 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6410 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6412 Prepend (Subt_Decl, List);
6414 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6415 Exchange_Declarations (Ftyp);
6418 Resolve (Actual, Ftyp);
6420 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6422 ("actual for& must be a variable", Actual, Formal_Id);
6424 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6426 "type of actual does not match type of&", Actual, Formal_Id);
6430 Note_Possible_Modification (Actual);
6432 -- Check for instantiation of atomic/volatile actual for
6433 -- non-atomic/volatile formal (RM C.6 (12)).
6435 if Is_Atomic_Object (Actual)
6436 and then not Is_Atomic (Orig_Ftyp)
6439 ("cannot instantiate non-atomic formal object " &
6440 "with atomic actual", Actual);
6442 elsif Is_Volatile_Object (Actual)
6443 and then not Is_Volatile (Orig_Ftyp)
6446 ("cannot instantiate non-volatile formal object " &
6447 "with volatile actual", Actual);
6453 -- The instantiation of a generic formal in-parameter
6454 -- is a constant declaration. The actual is the expression for
6455 -- that declaration.
6457 if Present (Actual) then
6459 Decl_Node := Make_Object_Declaration (Loc,
6460 Defining_Identifier => New_Copy (Formal_Id),
6461 Constant_Present => True,
6462 Object_Definition => New_Copy_Tree (Type_Id),
6463 Expression => Actual);
6465 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6467 -- A generic formal object of a tagged type is defined
6468 -- to be aliased so the new constant must also be treated
6472 (Etype (Defining_Identifier (Analyzed_Formal)))
6474 Set_Aliased_Present (Decl_Node);
6477 Append (Decl_Node, List);
6483 (Etype (Defining_Identifier (Analyzed_Formal)));
6485 Freeze_Before (Instantiation_Node, Typ);
6487 -- If the actual is an aggregate, perform name resolution
6488 -- on its components (the analysis of an aggregate does not
6489 -- do it) to capture local names that may be hidden if the
6490 -- generic is a child unit.
6492 if Nkind (Actual) = N_Aggregate then
6493 Pre_Analyze_And_Resolve (Actual, Typ);
6497 elsif Present (Expression (Formal)) then
6499 -- Use default to construct declaration.
6502 Make_Object_Declaration (Sloc (Formal),
6503 Defining_Identifier => New_Copy (Formal_Id),
6504 Constant_Present => True,
6505 Object_Definition => New_Copy (Type_Id),
6506 Expression => New_Copy_Tree (Expression (Formal)));
6508 Append (Decl_Node, List);
6509 Set_Analyzed (Expression (Decl_Node), False);
6513 ("missing actual for instantiation of &",
6514 Instantiation_Node, Formal_Id);
6515 Abandon_Instantiation (Instantiation_Node);
6521 end Instantiate_Object;
6523 ------------------------------
6524 -- Instantiate_Package_Body --
6525 ------------------------------
6527 procedure Instantiate_Package_Body
6528 (Body_Info : Pending_Body_Info)
6530 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6531 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6532 Loc : constant Source_Ptr := Sloc (Inst_Node);
6534 Gen_Id : constant Node_Id := Name (Inst_Node);
6535 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6536 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6537 Act_Spec : constant Node_Id := Specification (Act_Decl);
6538 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6540 Act_Body_Name : Node_Id;
6542 Gen_Body_Id : Node_Id;
6544 Act_Body_Id : Entity_Id;
6546 Parent_Installed : Boolean := False;
6547 Save_Style_Check : Boolean := Style_Check;
6550 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6552 -- The instance body may already have been processed, as the parent
6553 -- of another instance that is inlined. (Load_Parent_Of_Generic).
6555 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
6559 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6561 if No (Gen_Body_Id) then
6562 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6563 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6566 -- Establish global variable for sloc adjustment and for error
6569 Instantiation_Node := Inst_Node;
6571 if Present (Gen_Body_Id) then
6572 Save_Env (Gen_Unit, Act_Decl_Id);
6573 Style_Check := False;
6574 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6576 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6578 Create_Instantiation_Source
6579 (Inst_Node, Gen_Body_Id, S_Adjustment);
6583 (Original_Node (Gen_Body), Empty, Instantiating => True);
6585 -- Build new name (possibly qualified) for body declaration.
6587 Act_Body_Id := New_Copy (Act_Decl_Id);
6589 -- Some attributes of the spec entity are not inherited by the
6592 Set_Handler_Records (Act_Body_Id, No_List);
6594 if Nkind (Defining_Unit_Name (Act_Spec)) =
6595 N_Defining_Program_Unit_Name
6598 Make_Defining_Program_Unit_Name (Loc,
6599 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6600 Defining_Identifier => Act_Body_Id);
6602 Act_Body_Name := Act_Body_Id;
6605 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6607 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6608 Check_Generic_Actuals (Act_Decl_Id, False);
6610 -- If it is a child unit, make the parent instance (which is an
6611 -- instance of the parent of the generic) visible. The parent
6612 -- instance is the prefix of the name of the generic unit.
6614 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6615 and then Nkind (Gen_Id) = N_Expanded_Name
6617 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6618 Parent_Installed := True;
6620 elsif Is_Child_Unit (Gen_Unit) then
6621 Install_Parent (Scope (Gen_Unit), In_Body => True);
6622 Parent_Installed := True;
6625 -- If the instantiation is a library unit, and this is the main
6626 -- unit, then build the resulting compilation unit nodes for the
6627 -- instance. If this is a compilation unit but it is not the main
6628 -- unit, then it is the body of a unit in the context, that is being
6629 -- compiled because it is encloses some inlined unit or another
6630 -- generic unit being instantiated. In that case, this body is not
6631 -- part of the current compilation, and is not attached to the tree,
6632 -- but its parent must be set for analysis.
6634 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6636 -- Replace instance node with body of instance, and create
6637 -- new node for corresponding instance declaration.
6639 Build_Instance_Compilation_Unit_Nodes
6640 (Inst_Node, Act_Body, Act_Decl);
6641 Analyze (Inst_Node);
6643 if Parent (Inst_Node) = Cunit (Main_Unit) then
6645 -- If the instance is a child unit itself, then set the
6646 -- scope of the expanded body to be the parent of the
6647 -- instantiation (ensuring that the fully qualified name
6648 -- will be generated for the elaboration subprogram).
6650 if Nkind (Defining_Unit_Name (Act_Spec)) =
6651 N_Defining_Program_Unit_Name
6654 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6658 -- Case where instantiation is not a library unit
6661 -- If this is an early instantiation, i.e. appears textually
6662 -- before the corresponding body and must be elaborated first,
6663 -- indicate that the body instance is to be delayed.
6665 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6667 -- Now analyze the body. We turn off all checks if this is
6668 -- an internal unit, since there is no reason to have checks
6669 -- on for any predefined run-time library code. All such
6670 -- code is designed to be compiled with checks off.
6672 -- Note that we do NOT apply this criterion to children of
6673 -- GNAT (or on VMS, children of DEC). The latter units must
6674 -- suppress checks explicitly if this is needed.
6676 if Is_Predefined_File_Name
6677 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6679 Analyze (Act_Body, Suppress => All_Checks);
6685 if not Generic_Separately_Compiled (Gen_Unit) then
6686 Inherit_Context (Gen_Body, Inst_Node);
6689 -- Remove the parent instances if they have been placed on the
6690 -- scope stack to compile the body.
6692 if Parent_Installed then
6693 Remove_Parent (In_Body => True);
6696 Restore_Private_Views (Act_Decl_Id);
6698 Style_Check := Save_Style_Check;
6700 -- If we have no body, and the unit requires a body, then complain.
6701 -- This complaint is suppressed if we have detected other errors
6702 -- (since a common reason for missing the body is that it had errors).
6704 elsif Unit_Requires_Body (Gen_Unit) then
6705 if Serious_Errors_Detected = 0 then
6707 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6709 -- Don't attempt to perform any cleanup actions if some other
6710 -- error was aready detected, since this can cause blowups.
6716 -- Case of package that does not need a body
6719 -- If the instantiation of the declaration is a library unit,
6720 -- rewrite the original package instantiation as a package
6721 -- declaration in the compilation unit node.
6723 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6724 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6725 Rewrite (Inst_Node, Act_Decl);
6727 -- If the instantiation is not a library unit, then append the
6728 -- declaration to the list of implicitly generated entities.
6729 -- unless it is already a list member which means that it was
6730 -- already processed
6732 elsif not Is_List_Member (Act_Decl) then
6733 Mark_Rewrite_Insertion (Act_Decl);
6734 Insert_Before (Inst_Node, Act_Decl);
6738 Expander_Mode_Restore;
6739 end Instantiate_Package_Body;
6741 ---------------------------------
6742 -- Instantiate_Subprogram_Body --
6743 ---------------------------------
6745 procedure Instantiate_Subprogram_Body
6746 (Body_Info : Pending_Body_Info)
6748 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6749 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6750 Loc : constant Source_Ptr := Sloc (Inst_Node);
6753 Gen_Id : constant Node_Id := Name (Inst_Node);
6754 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6755 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6756 Anon_Id : constant Entity_Id :=
6757 Defining_Unit_Name (Specification (Act_Decl));
6759 Gen_Body_Id : Node_Id;
6761 Act_Body_Id : Entity_Id;
6762 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6763 Pack_Body : Node_Id;
6764 Prev_Formal : Entity_Id;
6765 Unit_Renaming : Node_Id;
6767 Parent_Installed : Boolean := False;
6768 Save_Style_Check : Boolean := Style_Check;
6771 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6773 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6775 if No (Gen_Body_Id) then
6776 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6777 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6780 Instantiation_Node := Inst_Node;
6782 if Present (Gen_Body_Id) then
6783 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6785 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6787 -- Either body is not present, or context is non-expanding, as
6788 -- when compiling a subunit. Mark the instance as completed.
6790 Set_Has_Completion (Anon_Id);
6794 Save_Env (Gen_Unit, Anon_Id);
6795 Style_Check := False;
6796 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6797 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6801 (Original_Node (Gen_Body), Empty, Instantiating => True);
6802 Act_Body_Id := Defining_Entity (Act_Body);
6803 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6804 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6805 Set_Corresponding_Spec (Act_Body, Anon_Id);
6806 Set_Has_Completion (Anon_Id);
6807 Check_Generic_Actuals (Pack_Id, False);
6809 -- If it is a child unit, make the parent instance (which is an
6810 -- instance of the parent of the generic) visible. The parent
6811 -- instance is the prefix of the name of the generic unit.
6813 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6814 and then Nkind (Gen_Id) = N_Expanded_Name
6816 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6817 Parent_Installed := True;
6819 elsif Is_Child_Unit (Gen_Unit) then
6820 Install_Parent (Scope (Gen_Unit), In_Body => True);
6821 Parent_Installed := True;
6824 -- Inside its body, a reference to the generic unit is a reference
6825 -- to the instance. The corresponding renaming is the first
6826 -- declaration in the body.
6829 Make_Subprogram_Renaming_Declaration (Loc,
6832 Specification (Original_Node (Gen_Body)),
6834 Instantiating => True),
6835 Name => New_Occurrence_Of (Anon_Id, Loc));
6837 -- If there is a formal subprogram with the same name as the
6838 -- unit itself, do not add this renaming declaration. This is
6839 -- a temporary fix for one ACVC test. ???
6841 Prev_Formal := First_Entity (Pack_Id);
6842 while Present (Prev_Formal) loop
6843 if Chars (Prev_Formal) = Chars (Gen_Unit)
6844 and then Is_Overloadable (Prev_Formal)
6849 Next_Entity (Prev_Formal);
6852 if Present (Prev_Formal) then
6853 Decls := New_List (Act_Body);
6855 Decls := New_List (Unit_Renaming, Act_Body);
6858 -- The subprogram body is placed in the body of a dummy package
6859 -- body, whose spec contains the subprogram declaration as well
6860 -- as the renaming declarations for the generic parameters.
6862 Pack_Body := Make_Package_Body (Loc,
6863 Defining_Unit_Name => New_Copy (Pack_Id),
6864 Declarations => Decls);
6866 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6868 -- If the instantiation is a library unit, then build resulting
6869 -- compilation unit nodes for the instance. The declaration of
6870 -- the enclosing package is the grandparent of the subprogram
6871 -- declaration. First replace the instantiation node as the unit
6872 -- of the corresponding compilation.
6874 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6876 if Parent (Inst_Node) = Cunit (Main_Unit) then
6877 Set_Unit (Parent (Inst_Node), Inst_Node);
6878 Build_Instance_Compilation_Unit_Nodes
6879 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6880 Analyze (Inst_Node);
6882 Set_Parent (Pack_Body, Parent (Inst_Node));
6883 Analyze (Pack_Body);
6887 Insert_Before (Inst_Node, Pack_Body);
6888 Mark_Rewrite_Insertion (Pack_Body);
6889 Analyze (Pack_Body);
6891 if Expander_Active then
6892 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6896 if not Generic_Separately_Compiled (Gen_Unit) then
6897 Inherit_Context (Gen_Body, Inst_Node);
6900 Restore_Private_Views (Pack_Id, False);
6902 if Parent_Installed then
6903 Remove_Parent (In_Body => True);
6907 Style_Check := Save_Style_Check;
6909 -- Body not found. Error was emitted already. If there were no
6910 -- previous errors, this may be an instance whose scope is a premature
6911 -- instance. In that case we must insure that the (legal) program does
6912 -- raise program error if executed. We generate a subprogram body for
6913 -- this purpose. See DEC ac30vso.
6915 elsif Serious_Errors_Detected = 0
6916 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6918 if Ekind (Anon_Id) = E_Procedure then
6920 Make_Subprogram_Body (Loc,
6922 Make_Procedure_Specification (Loc,
6923 Defining_Unit_Name => New_Copy (Anon_Id),
6924 Parameter_Specifications =>
6926 (Parameter_Specifications (Parent (Anon_Id)))),
6928 Declarations => Empty_List,
6929 Handled_Statement_Sequence =>
6930 Make_Handled_Sequence_Of_Statements (Loc,
6933 Make_Raise_Program_Error (Loc,
6935 PE_Access_Before_Elaboration))));
6939 Make_Subprogram_Body (Loc,
6941 Make_Function_Specification (Loc,
6942 Defining_Unit_Name => New_Copy (Anon_Id),
6943 Parameter_Specifications =>
6945 (Parameter_Specifications (Parent (Anon_Id))),
6947 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6949 Declarations => Empty_List,
6950 Handled_Statement_Sequence =>
6951 Make_Handled_Sequence_Of_Statements (Loc,
6952 Statements => New_List (
6953 Make_Return_Statement (Loc,
6955 Make_Raise_Program_Error (Loc,
6957 PE_Access_Before_Elaboration)))));
6960 Pack_Body := Make_Package_Body (Loc,
6961 Defining_Unit_Name => New_Copy (Pack_Id),
6962 Declarations => New_List (Act_Body));
6964 Insert_After (Inst_Node, Pack_Body);
6965 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6966 Analyze (Pack_Body);
6969 Expander_Mode_Restore;
6970 end Instantiate_Subprogram_Body;
6972 ----------------------
6973 -- Instantiate_Type --
6974 ----------------------
6976 function Instantiate_Type
6979 Analyzed_Formal : Node_Id)
6982 Loc : constant Source_Ptr := Sloc (Actual);
6983 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6984 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6985 Ancestor : Entity_Id;
6986 Def : constant Node_Id := Formal_Type_Definition (Formal);
6988 Decl_Node : Node_Id;
6990 procedure Validate_Array_Type_Instance;
6991 procedure Validate_Access_Subprogram_Instance;
6992 procedure Validate_Access_Type_Instance;
6993 procedure Validate_Derived_Type_Instance;
6994 procedure Validate_Private_Type_Instance;
6995 -- These procedures perform validation tests for the named case
6997 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6998 -- Check that base types are the same and that the subtypes match
6999 -- statically. Used in several of the above.
7001 --------------------
7002 -- Subtypes_Match --
7003 --------------------
7005 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7006 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7009 return (Base_Type (T) = Base_Type (Act_T)
7010 -- why is the and then commented out here???
7011 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7012 and then Subtypes_Statically_Match (T, Act_T))
7014 or else (Is_Class_Wide_Type (Gen_T)
7015 and then Is_Class_Wide_Type (Act_T)
7018 Get_Instance_Of (Root_Type (Gen_T)),
7019 Root_Type (Act_T)));
7022 -----------------------------------------
7023 -- Validate_Access_Subprogram_Instance --
7024 -----------------------------------------
7026 procedure Validate_Access_Subprogram_Instance is
7028 if not Is_Access_Type (Act_T)
7029 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7032 ("expect access type in instantiation of &", Actual, Gen_T);
7033 Abandon_Instantiation (Actual);
7036 Check_Mode_Conformant
7037 (Designated_Type (Act_T),
7038 Designated_Type (A_Gen_T),
7042 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7043 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7045 ("protected access type not allowed for formal &",
7049 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7051 ("expect protected access type for formal &",
7054 end Validate_Access_Subprogram_Instance;
7056 -----------------------------------
7057 -- Validate_Access_Type_Instance --
7058 -----------------------------------
7060 procedure Validate_Access_Type_Instance is
7061 Desig_Type : Entity_Id :=
7062 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7065 if not Is_Access_Type (Act_T) then
7067 ("expect access type in instantiation of &", Actual, Gen_T);
7068 Abandon_Instantiation (Actual);
7071 if Is_Access_Constant (A_Gen_T) then
7072 if not Is_Access_Constant (Act_T) then
7074 ("actual type must be access-to-constant type", Actual);
7075 Abandon_Instantiation (Actual);
7078 if Is_Access_Constant (Act_T) then
7080 ("actual type must be access-to-variable type", Actual);
7081 Abandon_Instantiation (Actual);
7083 elsif Ekind (A_Gen_T) = E_General_Access_Type
7084 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7086 Error_Msg_N ("actual must be general access type!", Actual);
7087 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7088 Abandon_Instantiation (Actual);
7092 -- The designated subtypes, that is to say the subtypes introduced
7093 -- by an access type declaration (and not by a subtype declaration)
7096 if not Subtypes_Match
7097 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7100 ("designated type of actual does not match that of formal &",
7102 Abandon_Instantiation (Actual);
7104 elsif Is_Access_Type (Designated_Type (Act_T))
7105 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7107 Is_Constrained (Designated_Type (Desig_Type))
7110 ("designated type of actual does not match that of formal &",
7112 Abandon_Instantiation (Actual);
7114 end Validate_Access_Type_Instance;
7116 ----------------------------------
7117 -- Validate_Array_Type_Instance --
7118 ----------------------------------
7120 procedure Validate_Array_Type_Instance is
7125 function Formal_Dimensions return Int;
7126 -- Count number of dimensions in array type formal
7128 function Formal_Dimensions return Int is
7133 if Nkind (Def) = N_Constrained_Array_Definition then
7134 Index := First (Discrete_Subtype_Definitions (Def));
7136 Index := First (Subtype_Marks (Def));
7139 while Present (Index) loop
7145 end Formal_Dimensions;
7147 -- Start of processing for Validate_Array_Type_Instance
7150 if not Is_Array_Type (Act_T) then
7152 ("expect array type in instantiation of &", Actual, Gen_T);
7153 Abandon_Instantiation (Actual);
7155 elsif Nkind (Def) = N_Constrained_Array_Definition then
7156 if not (Is_Constrained (Act_T)) then
7158 ("expect constrained array in instantiation of &",
7160 Abandon_Instantiation (Actual);
7164 if Is_Constrained (Act_T) then
7166 ("expect unconstrained array in instantiation of &",
7168 Abandon_Instantiation (Actual);
7172 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7174 ("dimensions of actual do not match formal &", Actual, Gen_T);
7175 Abandon_Instantiation (Actual);
7178 I1 := First_Index (A_Gen_T);
7179 I2 := First_Index (Act_T);
7180 for J in 1 .. Formal_Dimensions loop
7182 -- If the indices of the actual were given by a subtype_mark,
7183 -- the index was transformed into a range attribute. Retrieve
7184 -- the original type mark for checking.
7186 if Is_Entity_Name (Original_Node (I2)) then
7187 T2 := Entity (Original_Node (I2));
7192 if not Subtypes_Match
7193 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7196 ("index types of actual do not match those of formal &",
7198 Abandon_Instantiation (Actual);
7205 if not Subtypes_Match (
7206 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7207 Component_Type (Act_T))
7210 ("component subtype of actual does not match that of formal &",
7212 Abandon_Instantiation (Actual);
7215 if Has_Aliased_Components (A_Gen_T)
7216 and then not Has_Aliased_Components (Act_T)
7219 ("actual must have aliased components to match formal type &",
7223 end Validate_Array_Type_Instance;
7225 ------------------------------------
7226 -- Validate_Derived_Type_Instance --
7227 ------------------------------------
7229 procedure Validate_Derived_Type_Instance is
7230 Actual_Discr : Entity_Id;
7231 Ancestor_Discr : Entity_Id;
7234 -- If the parent type in the generic declaration is itself
7235 -- a previous formal type, then it is local to the generic
7236 -- and absent from the analyzed generic definition. In that
7237 -- case the ancestor is the instance of the formal (which must
7238 -- have been instantiated previously). Otherwise, the analyzed
7239 -- generic carries the parent type. If the parent type is defined
7240 -- in a previous formal package, then the scope of that formal
7241 -- package is that of the generic type itself, and it has already
7242 -- been mapped into the corresponding type in the actual package.
7244 -- Common case: parent type defined outside of the generic.
7246 if Is_Entity_Name (Subtype_Mark (Def))
7247 and then Present (Entity (Subtype_Mark (Def)))
7249 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7251 -- Check whether parent is defined in a previous formal package.
7254 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7257 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7259 -- The type may be a local derivation, or a type extension of
7260 -- a previous formal, or of a formal of a parent package.
7262 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
7264 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
7267 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7270 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7273 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7275 ("expect type derived from & in instantiation",
7276 Actual, First_Subtype (Ancestor));
7277 Abandon_Instantiation (Actual);
7280 -- Perform atomic/volatile checks (RM C.6(12))
7282 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7284 ("cannot have atomic actual type for non-atomic formal type",
7287 elsif Is_Volatile (Act_T)
7288 and then not Is_Volatile (Ancestor)
7289 and then Is_By_Reference_Type (Ancestor)
7292 ("cannot have volatile actual type for non-volatile formal type",
7296 -- It should not be necessary to check for unknown discriminants
7297 -- on Formal, but for some reason Has_Unknown_Discriminants is
7298 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7299 -- returns False. This needs fixing. ???
7301 if not Is_Indefinite_Subtype (A_Gen_T)
7302 and then not Unknown_Discriminants_Present (Formal)
7303 and then Is_Indefinite_Subtype (Act_T)
7306 ("actual subtype must be constrained", Actual);
7307 Abandon_Instantiation (Actual);
7310 if not Unknown_Discriminants_Present (Formal) then
7311 if Is_Constrained (Ancestor) then
7312 if not Is_Constrained (Act_T) then
7314 ("actual subtype must be constrained", Actual);
7315 Abandon_Instantiation (Actual);
7318 -- Ancestor is unconstrained
7320 elsif Is_Constrained (Act_T) then
7321 if Ekind (Ancestor) = E_Access_Type
7322 or else Is_Composite_Type (Ancestor)
7325 ("actual subtype must be unconstrained", Actual);
7326 Abandon_Instantiation (Actual);
7329 -- A class-wide type is only allowed if the formal has
7330 -- unknown discriminants.
7332 elsif Is_Class_Wide_Type (Act_T)
7333 and then not Has_Unknown_Discriminants (Ancestor)
7336 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7337 Abandon_Instantiation (Actual);
7339 -- Otherwise, the formal and actual shall have the same
7340 -- number of discriminants and each discriminant of the
7341 -- actual must correspond to a discriminant of the formal.
7343 elsif Has_Discriminants (Act_T)
7344 and then Has_Discriminants (Ancestor)
7346 Actual_Discr := First_Discriminant (Act_T);
7347 Ancestor_Discr := First_Discriminant (Ancestor);
7348 while Present (Actual_Discr)
7349 and then Present (Ancestor_Discr)
7351 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7352 not Present (Corresponding_Discriminant (Actual_Discr))
7355 ("discriminant & does not correspond " &
7356 "to ancestor discriminant", Actual, Actual_Discr);
7357 Abandon_Instantiation (Actual);
7360 Next_Discriminant (Actual_Discr);
7361 Next_Discriminant (Ancestor_Discr);
7364 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7366 ("actual for & must have same number of discriminants",
7368 Abandon_Instantiation (Actual);
7371 -- This case should be caught by the earlier check for
7372 -- for constrainedness, but the check here is added for
7375 elsif Has_Discriminants (Act_T) then
7377 ("actual for & must not have discriminants", Actual, Gen_T);
7378 Abandon_Instantiation (Actual);
7380 elsif Has_Discriminants (Ancestor) then
7382 ("actual for & must have known discriminants", Actual, Gen_T);
7383 Abandon_Instantiation (Actual);
7386 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7388 ("constraint on actual is incompatible with formal", Actual);
7389 Abandon_Instantiation (Actual);
7393 end Validate_Derived_Type_Instance;
7395 ------------------------------------
7396 -- Validate_Private_Type_Instance --
7397 ------------------------------------
7399 procedure Validate_Private_Type_Instance is
7400 Formal_Discr : Entity_Id;
7401 Actual_Discr : Entity_Id;
7402 Formal_Subt : Entity_Id;
7405 if (Is_Limited_Type (Act_T)
7406 or else Is_Limited_Composite (Act_T))
7407 and then not Is_Limited_Type (A_Gen_T)
7410 ("actual for non-limited & cannot be a limited type", Actual,
7412 Abandon_Instantiation (Actual);
7414 elsif Is_Indefinite_Subtype (Act_T)
7415 and then not Is_Indefinite_Subtype (A_Gen_T)
7419 ("actual for & must be a definite subtype", Actual, Gen_T);
7421 elsif not Is_Tagged_Type (Act_T)
7422 and then Is_Tagged_Type (A_Gen_T)
7425 ("actual for & must be a tagged type", Actual, Gen_T);
7427 elsif Has_Discriminants (A_Gen_T) then
7428 if not Has_Discriminants (Act_T) then
7430 ("actual for & must have discriminants", Actual, Gen_T);
7431 Abandon_Instantiation (Actual);
7433 elsif Is_Constrained (Act_T) then
7435 ("actual for & must be unconstrained", Actual, Gen_T);
7436 Abandon_Instantiation (Actual);
7439 Formal_Discr := First_Discriminant (A_Gen_T);
7440 Actual_Discr := First_Discriminant (Act_T);
7441 while Formal_Discr /= Empty loop
7442 if Actual_Discr = Empty then
7444 ("discriminants on actual do not match formal",
7446 Abandon_Instantiation (Actual);
7449 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7451 -- access discriminants match if designated types do.
7453 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7454 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7455 = E_Anonymous_Access_Type
7456 and then Get_Instance_Of (
7457 Designated_Type (Base_Type (Formal_Subt)))
7458 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7462 elsif Base_Type (Formal_Subt) /=
7463 Base_Type (Etype (Actual_Discr))
7466 ("types of actual discriminants must match formal",
7468 Abandon_Instantiation (Actual);
7470 elsif not Subtypes_Statically_Match
7471 (Formal_Subt, Etype (Actual_Discr))
7475 ("subtypes of actual discriminants must match formal",
7477 Abandon_Instantiation (Actual);
7480 Next_Discriminant (Formal_Discr);
7481 Next_Discriminant (Actual_Discr);
7484 if Actual_Discr /= Empty then
7486 ("discriminants on actual do not match formal",
7488 Abandon_Instantiation (Actual);
7495 end Validate_Private_Type_Instance;
7497 -- Start of processing for Instantiate_Type
7500 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7501 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7504 elsif not Is_Entity_Name (Actual)
7505 or else not Is_Type (Entity (Actual))
7508 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7509 Abandon_Instantiation (Actual);
7512 Act_T := Entity (Actual);
7514 -- Deal with fixed/floating restrictions
7516 if Is_Floating_Point_Type (Act_T) then
7517 Check_Restriction (No_Floating_Point, Actual);
7518 elsif Is_Fixed_Point_Type (Act_T) then
7519 Check_Restriction (No_Fixed_Point, Actual);
7522 -- Deal with error of using incomplete type as generic actual
7524 if Ekind (Act_T) = E_Incomplete_Type then
7525 if No (Underlying_Type (Act_T)) then
7526 Error_Msg_N ("premature use of incomplete type", Actual);
7527 Abandon_Instantiation (Actual);
7529 Act_T := Full_View (Act_T);
7530 Set_Entity (Actual, Act_T);
7532 if Has_Private_Component (Act_T) then
7534 ("premature use of type with private component", Actual);
7538 -- Deal with error of premature use of private type as generic actual
7540 elsif Is_Private_Type (Act_T)
7541 and then Is_Private_Type (Base_Type (Act_T))
7542 and then not Is_Generic_Type (Act_T)
7543 and then not Is_Derived_Type (Act_T)
7544 and then No (Full_View (Root_Type (Act_T)))
7546 Error_Msg_N ("premature use of private type", Actual);
7548 elsif Has_Private_Component (Act_T) then
7550 ("premature use of type with private component", Actual);
7553 Set_Instance_Of (A_Gen_T, Act_T);
7555 -- If the type is generic, the class-wide type may also be used
7557 if Is_Tagged_Type (A_Gen_T)
7558 and then Is_Tagged_Type (Act_T)
7559 and then not Is_Class_Wide_Type (A_Gen_T)
7561 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7562 Class_Wide_Type (Act_T));
7565 if not Is_Abstract (A_Gen_T)
7566 and then Is_Abstract (Act_T)
7569 ("actual of non-abstract formal cannot be abstract", Actual);
7572 if Is_Scalar_Type (Gen_T) then
7573 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7578 when N_Formal_Private_Type_Definition =>
7579 Validate_Private_Type_Instance;
7581 when N_Formal_Derived_Type_Definition =>
7582 Validate_Derived_Type_Instance;
7584 when N_Formal_Discrete_Type_Definition =>
7585 if not Is_Discrete_Type (Act_T) then
7587 ("expect discrete type in instantiation of&", Actual, Gen_T);
7588 Abandon_Instantiation (Actual);
7591 when N_Formal_Signed_Integer_Type_Definition =>
7592 if not Is_Signed_Integer_Type (Act_T) then
7594 ("expect signed integer type in instantiation of&",
7596 Abandon_Instantiation (Actual);
7599 when N_Formal_Modular_Type_Definition =>
7600 if not Is_Modular_Integer_Type (Act_T) then
7602 ("expect modular type in instantiation of &", Actual, Gen_T);
7603 Abandon_Instantiation (Actual);
7606 when N_Formal_Floating_Point_Definition =>
7607 if not Is_Floating_Point_Type (Act_T) then
7609 ("expect float type in instantiation of &", Actual, Gen_T);
7610 Abandon_Instantiation (Actual);
7613 when N_Formal_Ordinary_Fixed_Point_Definition =>
7614 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7616 ("expect ordinary fixed point type in instantiation of &",
7618 Abandon_Instantiation (Actual);
7621 when N_Formal_Decimal_Fixed_Point_Definition =>
7622 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7624 ("expect decimal type in instantiation of &",
7626 Abandon_Instantiation (Actual);
7629 when N_Array_Type_Definition =>
7630 Validate_Array_Type_Instance;
7632 when N_Access_To_Object_Definition =>
7633 Validate_Access_Type_Instance;
7635 when N_Access_Function_Definition |
7636 N_Access_Procedure_Definition =>
7637 Validate_Access_Subprogram_Instance;
7640 raise Program_Error;
7645 Make_Subtype_Declaration (Loc,
7646 Defining_Identifier => New_Copy (Gen_T),
7647 Subtype_Indication => New_Reference_To (Act_T, Loc));
7649 if Is_Private_Type (Act_T) then
7650 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7653 -- Flag actual derived types so their elaboration produces the
7654 -- appropriate renamings for the primitive operations of the ancestor.
7655 -- Flag actual for formal private types as well, to determine whether
7656 -- operations in the private part may override inherited operations.
7658 if Nkind (Def) = N_Formal_Derived_Type_Definition
7659 or else Nkind (Def) = N_Formal_Private_Type_Definition
7661 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7665 end Instantiate_Type;
7667 ---------------------
7668 -- Is_In_Main_Unit --
7669 ---------------------
7671 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7672 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7674 Current_Unit : Node_Id;
7677 if Unum = Main_Unit then
7680 -- If the current unit is a subunit then it is either the main unit
7681 -- or is being compiled as part of the main unit.
7683 elsif Nkind (N) = N_Compilation_Unit then
7684 return Nkind (Unit (N)) = N_Subunit;
7687 Current_Unit := Parent (N);
7688 while Present (Current_Unit)
7689 and then Nkind (Current_Unit) /= N_Compilation_Unit
7691 Current_Unit := Parent (Current_Unit);
7694 -- The instantiation node is in the main unit, or else the current
7695 -- node (perhaps as the result of nested instantiations) is in the
7696 -- main unit, or in the declaration of the main unit, which in this
7697 -- last case must be a body.
7699 return Unum = Main_Unit
7700 or else Current_Unit = Cunit (Main_Unit)
7701 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7702 or else (Present (Library_Unit (Current_Unit))
7703 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7704 end Is_In_Main_Unit;
7706 ----------------------------
7707 -- Load_Parent_Of_Generic --
7708 ----------------------------
7710 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7711 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7712 True_Parent : Node_Id;
7713 Inst_Node : Node_Id;
7715 Save_Style_Check : Boolean := Style_Check;
7718 if not In_Same_Source_Unit (N, Spec)
7719 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7720 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7721 and then not Is_In_Main_Unit (Spec))
7723 -- Find body of parent of spec, and analyze it. A special case
7724 -- arises when the parent is an instantiation, that is to say when
7725 -- we are currently instantiating a nested generic. In that case,
7726 -- there is no separate file for the body of the enclosing instance.
7727 -- Instead, the enclosing body must be instantiated as if it were
7728 -- a pending instantiation, in order to produce the body for the
7729 -- nested generic we require now. Note that in that case the
7730 -- generic may be defined in a package body, the instance defined
7731 -- in the same package body, and the original enclosing body may not
7732 -- be in the main unit.
7734 True_Parent := Parent (Spec);
7737 while Present (True_Parent)
7738 and then Nkind (True_Parent) /= N_Compilation_Unit
7740 if Nkind (True_Parent) = N_Package_Declaration
7742 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7744 -- Parent is a compilation unit that is an instantiation.
7745 -- Instantiation node has been replaced with package decl.
7747 Inst_Node := Original_Node (True_Parent);
7750 elsif Nkind (True_Parent) = N_Package_Declaration
7751 and then Present (Generic_Parent (Specification (True_Parent)))
7753 -- Parent is an instantiation within another specification.
7754 -- Declaration for instance has been inserted before original
7755 -- instantiation node. A direct link would be preferable?
7757 Inst_Node := Next (True_Parent);
7759 while Present (Inst_Node)
7760 and then Nkind (Inst_Node) /= N_Package_Instantiation
7765 -- If the instance appears within a generic, and the generic
7766 -- unit is defined within a formal package of the enclosing
7767 -- generic, there is no generic body available, and none
7768 -- needed. A more precise test should be used ???
7770 if No (Inst_Node) then
7776 True_Parent := Parent (True_Parent);
7780 if Present (Inst_Node) then
7782 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7784 -- Instantiation node and declaration of instantiated package
7785 -- were exchanged when only the declaration was needed.
7786 -- Restore instantiation node before proceeding with body.
7788 Set_Unit (Parent (True_Parent), Inst_Node);
7791 -- Now complete instantiation of enclosing body, if it appears
7792 -- in some other unit. If it appears in the current unit, the
7793 -- body will have been instantiated already.
7795 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7796 Instantiate_Package_Body
7797 (Pending_Body_Info'(
7798 Inst_Node, True_Parent, Expander_Active,
7799 Get_Code_Unit (Sloc (Inst_Node))));
7803 Opt.Style_Check := False;
7804 Load_Needed_Body (Comp_Unit, OK);
7805 Opt.Style_Check := Save_Style_Check;
7808 and then Unit_Requires_Body (Defining_Entity (Spec))
7811 Bname : constant Unit_Name_Type :=
7812 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7815 Error_Msg_Unit_1 := Bname;
7816 Error_Msg_N ("this instantiation requires$!", N);
7818 Get_File_Name (Bname, Subunit => False);
7819 Error_Msg_N ("\but file{ was not found!", N);
7820 raise Unrecoverable_Error;
7826 -- If loading the parent of the generic caused an instantiation
7827 -- circularity, we abandon compilation at this point, because
7828 -- otherwise in some cases we get into trouble with infinite
7829 -- recursions after this point.
7831 if Circularity_Detected then
7832 raise Unrecoverable_Error;
7835 end Load_Parent_Of_Generic;
7837 -----------------------
7838 -- Move_Freeze_Nodes --
7839 -----------------------
7841 procedure Move_Freeze_Nodes
7842 (Out_Of : Entity_Id;
7847 Next_Decl : Node_Id;
7848 Next_Node : Node_Id := After;
7851 function Is_Outer_Type (T : Entity_Id) return Boolean;
7852 -- Check whether entity is declared in a scope external to that
7853 -- of the generic unit.
7859 function Is_Outer_Type (T : Entity_Id) return Boolean is
7860 Scop : Entity_Id := Scope (T);
7863 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7867 while Scop /= Standard_Standard loop
7869 if Scop = Out_Of then
7872 Scop := Scope (Scop);
7880 -- Start of processing for Move_Freeze_Nodes
7887 -- First remove the freeze nodes that may appear before all other
7891 while Present (Decl)
7892 and then Nkind (Decl) = N_Freeze_Entity
7893 and then Is_Outer_Type (Entity (Decl))
7895 Decl := Remove_Head (L);
7896 Insert_After (Next_Node, Decl);
7897 Set_Analyzed (Decl, False);
7902 -- Next scan the list of declarations and remove each freeze node that
7903 -- appears ahead of the current node.
7905 while Present (Decl) loop
7906 while Present (Next (Decl))
7907 and then Nkind (Next (Decl)) = N_Freeze_Entity
7908 and then Is_Outer_Type (Entity (Next (Decl)))
7910 Next_Decl := Remove_Next (Decl);
7911 Insert_After (Next_Node, Next_Decl);
7912 Set_Analyzed (Next_Decl, False);
7913 Next_Node := Next_Decl;
7916 -- If the declaration is a nested package or concurrent type, then
7917 -- recurse. Nested generic packages will have been processed from the
7920 if Nkind (Decl) = N_Package_Declaration then
7921 Spec := Specification (Decl);
7923 elsif Nkind (Decl) = N_Task_Type_Declaration then
7924 Spec := Task_Definition (Decl);
7926 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7927 Spec := Protected_Definition (Decl);
7933 if Present (Spec) then
7934 Move_Freeze_Nodes (Out_Of, Next_Node,
7935 Visible_Declarations (Spec));
7936 Move_Freeze_Nodes (Out_Of, Next_Node,
7937 Private_Declarations (Spec));
7942 end Move_Freeze_Nodes;
7948 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7950 return Generic_Renamings.Table (E).Next_In_HTable;
7953 ------------------------
7954 -- Preanalyze_Actuals --
7955 ------------------------
7957 procedure Pre_Analyze_Actuals (N : Node_Id) is
7960 Errs : Int := Serious_Errors_Detected;
7963 Assoc := First (Generic_Associations (N));
7965 while Present (Assoc) loop
7966 Act := Explicit_Generic_Actual_Parameter (Assoc);
7968 -- Within a nested instantiation, a defaulted actual is an
7969 -- empty association, so nothing to analyze. If the actual for
7970 -- a subprogram is an attribute, analyze prefix only, because
7971 -- actual is not a complete attribute reference.
7972 -- String literals may be operators, but at this point we do not
7973 -- know whether the actual is a formal subprogram or a string.
7978 elsif Nkind (Act) = N_Attribute_Reference then
7979 Analyze (Prefix (Act));
7981 elsif Nkind (Act) = N_Explicit_Dereference then
7982 Analyze (Prefix (Act));
7984 elsif Nkind (Act) /= N_Operator_Symbol then
7988 if Errs /= Serious_Errors_Detected then
7989 Abandon_Instantiation (Act);
7994 end Pre_Analyze_Actuals;
8000 procedure Remove_Parent (In_Body : Boolean := False) is
8001 S : Entity_Id := Current_Scope;
8007 -- After child instantiation is complete, remove from scope stack
8008 -- the extra copy of the current scope, and then remove parent
8014 while Current_Scope /= S loop
8016 End_Package_Scope (Current_Scope);
8018 if In_Open_Scopes (P) then
8019 E := First_Entity (P);
8021 while Present (E) loop
8022 Set_Is_Immediately_Visible (E, True);
8026 if Is_Generic_Instance (Current_Scope)
8027 and then P /= Current_Scope
8029 -- We are within an instance of some sibling. Retain
8030 -- visibility of parent, for proper subsequent cleanup.
8032 Set_In_Private_Part (P);
8035 elsif not In_Open_Scopes (Scope (P)) then
8036 Set_Is_Immediately_Visible (P, False);
8040 -- Reset visibility of entities in the enclosing scope.
8042 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8043 Hidden := First_Elmt (Hidden_Entities);
8045 while Present (Hidden) loop
8046 Set_Is_Immediately_Visible (Node (Hidden), True);
8051 -- Each body is analyzed separately, and there is no context
8052 -- that needs preserving from one body instance to the next,
8053 -- so remove all parent scopes that have been installed.
8055 while Present (S) loop
8056 End_Package_Scope (S);
8058 exit when S = Standard_Standard;
8068 procedure Restore_Env is
8069 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8072 Ada_83 := Saved.Ada_83;
8074 if No (Current_Instantiated_Parent.Act_Id) then
8076 -- Restore environment after subprogram inlining
8078 Restore_Private_Views (Empty);
8081 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8082 Exchanged_Views := Saved.Exchanged_Views;
8083 Hidden_Entities := Saved.Hidden_Entities;
8084 Current_Sem_Unit := Saved.Current_Sem_Unit;
8086 Instance_Envs.Decrement_Last;
8089 ---------------------------
8090 -- Restore_Private_Views --
8091 ---------------------------
8093 procedure Restore_Private_Views
8094 (Pack_Id : Entity_Id;
8095 Is_Package : Boolean := True)
8104 M := First_Elmt (Exchanged_Views);
8105 while Present (M) loop
8108 -- Subtypes of types whose views have been exchanged, and that
8109 -- are defined within the instance, were not on the list of
8110 -- Private_Dependents on entry to the instance, so they have to
8111 -- be exchanged explicitly now, in order to remain consistent with
8112 -- the view of the parent type.
8114 if Ekind (Typ) = E_Private_Type
8115 or else Ekind (Typ) = E_Limited_Private_Type
8116 or else Ekind (Typ) = E_Record_Type_With_Private
8118 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8120 while Present (Dep_Elmt) loop
8121 Dep_Typ := Node (Dep_Elmt);
8123 if Scope (Dep_Typ) = Pack_Id
8124 and then Present (Full_View (Dep_Typ))
8126 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8127 Exchange_Declarations (Dep_Typ);
8130 Next_Elmt (Dep_Elmt);
8134 Exchange_Declarations (Node (M));
8138 if No (Pack_Id) then
8142 -- Make the generic formal parameters private, and make the formal
8143 -- types into subtypes of the actuals again.
8145 E := First_Entity (Pack_Id);
8147 while Present (E) loop
8148 Set_Is_Hidden (E, True);
8151 and then Nkind (Parent (E)) = N_Subtype_Declaration
8153 Set_Is_Generic_Actual_Type (E, False);
8155 -- An unusual case of aliasing: the actual may also be directly
8156 -- visible in the generic, and be private there, while it is
8157 -- fully visible in the context of the instance. The internal
8158 -- subtype is private in the instance, but has full visibility
8159 -- like its parent in the enclosing scope. This enforces the
8160 -- invariant that the privacy status of all private dependents of
8161 -- a type coincide with that of the parent type. This can only
8162 -- happen when a generic child unit is instantiated within a
8165 if Is_Private_Type (E)
8166 and then not Is_Private_Type (Etype (E))
8168 Exchange_Declarations (E);
8171 elsif Ekind (E) = E_Package then
8173 -- The end of the renaming list is the renaming of the generic
8174 -- package itself. If the instance is a subprogram, all entities
8175 -- in the corresponding package are renamings. If this entity is
8176 -- a formal package, make its own formals private as well. The
8177 -- actual in this case is itself the renaming of an instantiation.
8178 -- If the entity is not a package renaming, it is the entity
8179 -- created to validate formal package actuals: ignore.
8181 -- If the actual is itself a formal package for the enclosing
8182 -- generic, or the actual for such a formal package, it remains
8183 -- visible after the current instance, and therefore nothing
8184 -- needs to be done either, except to keep it accessible.
8187 and then Renamed_Object (E) = Pack_Id
8191 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8194 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8195 Set_Is_Hidden (E, False);
8199 Act_P : Entity_Id := Renamed_Object (E);
8200 Id : Entity_Id := First_Entity (Act_P);
8204 and then Id /= First_Private_Entity (Act_P)
8206 Set_Is_Hidden (Id, True);
8207 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8208 exit when Ekind (Id) = E_Package
8209 and then Renamed_Object (Id) = Act_P;
8220 end Restore_Private_Views;
8227 (Gen_Unit : Entity_Id;
8228 Act_Unit : Entity_Id)
8230 Saved : Instance_Env;
8233 Saved.Ada_83 := Ada_83;
8234 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8235 Saved.Exchanged_Views := Exchanged_Views;
8236 Saved.Hidden_Entities := Hidden_Entities;
8237 Saved.Current_Sem_Unit := Current_Sem_Unit;
8238 Instance_Envs.Increment_Last;
8239 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8241 -- Regardless of the current mode, predefined units are analyzed in
8242 -- Ada95 mode, and Ada83 checks don't apply.
8244 if Is_Internal_File_Name
8245 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8246 Renamings_Included => True) then
8250 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8251 Exchanged_Views := New_Elmt_List;
8252 Hidden_Entities := New_Elmt_List;
8255 ----------------------------
8256 -- Save_Global_References --
8257 ----------------------------
8259 procedure Save_Global_References (N : Node_Id) is
8260 Gen_Scope : Entity_Id;
8264 function Is_Global (E : Entity_Id) return Boolean;
8265 -- Check whether entity is defined outside of generic unit.
8266 -- Examine the scope of an entity, and the scope of the scope,
8267 -- etc, until we find either Standard, in which case the entity
8268 -- is global, or the generic unit itself, which indicates that
8269 -- the entity is local. If the entity is the generic unit itself,
8270 -- as in the case of a recursive call, or the enclosing generic unit,
8271 -- if different from the current scope, then it is local as well,
8272 -- because it will be replaced at the point of instantiation. On
8273 -- the other hand, if it is a reference to a child unit of a common
8274 -- ancestor, which appears in an instantiation, it is global because
8275 -- it is used to denote a specific compilation unit at the time the
8276 -- instantiations will be analyzed.
8278 procedure Reset_Entity (N : Node_Id);
8279 -- Save semantic information on global entity, so that it is not
8280 -- resolved again at instantiation time.
8282 procedure Save_Entity_Descendants (N : Node_Id);
8283 -- Apply Save_Global_References to the two syntactic descendants of
8284 -- non-terminal nodes that carry an Associated_Node and are processed
8285 -- through Reset_Entity. Once the global entity (if any) has been
8286 -- captured together with its type, only two syntactic descendants
8287 -- need to be traversed to complete the processing of the tree rooted
8288 -- at N. This applies to Selected_Components, Expanded_Names, and to
8289 -- Operator nodes. N can also be a character literal, identifier, or
8290 -- operator symbol node, but the call has no effect in these cases.
8292 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8293 -- Default actuals in nested instances must be handled specially
8294 -- because there is no link to them from the original tree. When an
8295 -- actual subprogram is given by a default, we add an explicit generic
8296 -- association for it in the instantiation node. When we save the
8297 -- global references on the name of the instance, we recover the list
8298 -- of generic associations, and add an explicit one to the original
8299 -- generic tree, through which a global actual can be preserved.
8300 -- Similarly, if a child unit is instantiated within a sibling, in the
8301 -- context of the parent, we must preserve the identifier of the parent
8302 -- so that it can be properly resolved in a subsequent instantiation.
8304 procedure Save_Global_Descendant (D : Union_Id);
8305 -- Apply Save_Global_References recursively to the descendents of
8308 procedure Save_References (N : Node_Id);
8309 -- This is the recursive procedure that does the work, once the
8310 -- enclosing generic scope has been established.
8316 function Is_Global (E : Entity_Id) return Boolean is
8317 Se : Entity_Id := Scope (E);
8319 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8320 -- Determine whether the parent node of a reference to a child unit
8321 -- denotes an instantiation or a formal package, in which case the
8322 -- reference to the child unit is global, even if it appears within
8323 -- the current scope (e.g. when the instance appears within the body
8326 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8328 return (Nkind (Decl) in N_Generic_Instantiation
8330 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8331 end Is_Instance_Node;
8333 -- Start of processing for Is_Global
8336 if E = Gen_Scope then
8339 elsif E = Standard_Standard then
8342 elsif Is_Child_Unit (E)
8343 and then (Is_Instance_Node (Parent (N2))
8344 or else (Nkind (Parent (N2)) = N_Expanded_Name
8345 and then N2 = Selector_Name (Parent (N2))
8346 and then Is_Instance_Node (Parent (Parent (N2)))))
8351 while Se /= Gen_Scope loop
8352 if Se = Standard_Standard then
8367 procedure Reset_Entity (N : Node_Id) is
8369 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8370 -- The type of N2 is global to the generic unit. Save the
8371 -- type in the generic node.
8373 ---------------------
8374 -- Set_Global_Type --
8375 ---------------------
8377 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8378 Typ : constant Entity_Id := Etype (N2);
8384 and then Has_Private_View (Entity (N))
8386 -- If the entity of N is not the associated node, this is
8387 -- a nested generic and it has an associated node as well,
8388 -- whose type is already the full view (see below). Indicate
8389 -- that the original node has a private view.
8391 Set_Has_Private_View (N);
8394 -- If not a private type, nothing else to do
8396 if not Is_Private_Type (Typ) then
8397 if Is_Array_Type (Typ)
8398 and then Is_Private_Type (Component_Type (Typ))
8400 Set_Has_Private_View (N);
8403 -- If it is a derivation of a private type in a context where
8404 -- no full view is needed, nothing to do either.
8406 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8409 -- Otherwise mark the type for flipping and use the full_view
8413 Set_Has_Private_View (N);
8415 if Present (Full_View (Typ)) then
8416 Set_Etype (N2, Full_View (Typ));
8419 end Set_Global_Type;
8421 -- Start of processing for Reset_Entity
8424 N2 := Get_Associated_Node (N);
8428 if Is_Global (E) then
8429 Set_Global_Type (N, N2);
8431 elsif Nkind (N) = N_Op_Concat
8432 and then Is_Generic_Type (Etype (N2))
8434 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8435 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8436 and then Is_Intrinsic_Subprogram (E)
8441 -- Entity is local. Mark generic node as unresolved.
8442 -- Note that now it does not have an entity.
8444 Set_Associated_Node (N, Empty);
8445 Set_Etype (N, Empty);
8448 if (Nkind (Parent (N)) = N_Package_Instantiation
8449 or else Nkind (Parent (N)) = N_Function_Instantiation
8450 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8451 and then N = Name (Parent (N))
8453 Save_Global_Defaults (Parent (N), Parent (N2));
8456 elsif Nkind (Parent (N)) = N_Selected_Component
8457 and then Nkind (Parent (N2)) = N_Expanded_Name
8460 if Is_Global (Entity (Parent (N2))) then
8461 Change_Selected_Component_To_Expanded_Name (Parent (N));
8462 Set_Associated_Node (Parent (N), Parent (N2));
8463 Set_Global_Type (Parent (N), Parent (N2));
8464 Save_Entity_Descendants (N);
8466 -- If this is a reference to the current generic entity,
8467 -- replace it with a simple name. This is to avoid anomalies
8468 -- when the enclosing scope is also a generic unit, in which
8469 -- case the selected component will not resolve to the current
8470 -- unit within an instance of the outer one. Ditto if the
8471 -- entity is an enclosing scope, e.g. a parent unit.
8473 elsif In_Open_Scopes (Entity (Parent (N2)))
8474 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8476 Rewrite (Parent (N),
8477 Make_Identifier (Sloc (N),
8478 Chars => Chars (Selector_Name (Parent (N2)))));
8481 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8482 or else Nkind (Parent (Parent (N)))
8483 = N_Function_Instantiation
8484 or else Nkind (Parent (Parent (N)))
8485 = N_Procedure_Instantiation)
8486 and then Parent (N) = Name (Parent (Parent (N)))
8488 Save_Global_Defaults
8489 (Parent (Parent (N)), Parent (Parent ((N2))));
8492 -- A selected component may denote a static constant that has
8493 -- been folded. Make the same replacement in original tree.
8495 elsif Nkind (Parent (N)) = N_Selected_Component
8496 and then (Nkind (Parent (N2)) = N_Integer_Literal
8497 or else Nkind (Parent (N2)) = N_Real_Literal)
8499 Rewrite (Parent (N),
8500 New_Copy (Parent (N2)));
8501 Set_Analyzed (Parent (N), False);
8503 -- A selected component may be transformed into a parameterless
8504 -- function call. If the called entity is global, rewrite the
8505 -- node appropriately, i.e. as an extended name for the global
8508 elsif Nkind (Parent (N)) = N_Selected_Component
8509 and then Nkind (Parent (N2)) = N_Function_Call
8510 and then Is_Global (Entity (Name (Parent (N2))))
8512 Change_Selected_Component_To_Expanded_Name (Parent (N));
8513 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8514 Set_Global_Type (Parent (N), Name (Parent (N2)));
8515 Save_Entity_Descendants (N);
8518 -- Entity is local. Reset in generic unit, so that node
8519 -- is resolved anew at the point of instantiation.
8521 Set_Associated_Node (N, Empty);
8522 Set_Etype (N, Empty);
8526 -----------------------------
8527 -- Save_Entity_Descendants --
8528 -----------------------------
8530 procedure Save_Entity_Descendants (N : Node_Id) is
8534 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
8535 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
8538 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
8540 when N_Expanded_Name | N_Selected_Component =>
8541 Save_Global_Descendant (Union_Id (Prefix (N)));
8542 Save_Global_Descendant (Union_Id (Selector_Name (N)));
8544 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
8548 raise Program_Error;
8550 end Save_Entity_Descendants;
8552 --------------------------
8553 -- Save_Global_Defaults --
8554 --------------------------
8556 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8557 Loc : constant Source_Ptr := Sloc (N1);
8558 Assoc1 : List_Id := Generic_Associations (N1);
8559 Assoc2 : List_Id := Generic_Associations (N2);
8563 Gen_Id : Entity_Id := Get_Generic_Entity (N2);
8569 if Present (Assoc1) then
8570 Act1 := First (Assoc1);
8573 Set_Generic_Associations (N1, New_List);
8574 Assoc1 := Generic_Associations (N1);
8577 if Present (Assoc2) then
8578 Act2 := First (Assoc2);
8583 while Present (Act1) and then Present (Act2) loop
8588 -- Find the associations added for default suprograms.
8590 if Present (Act2) then
8591 while Nkind (Act2) /= N_Generic_Association
8592 or else No (Entity (Selector_Name (Act2)))
8593 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8598 -- Add a similar association if the default is global. The
8599 -- renaming declaration for the actual has been analyzed, and
8600 -- its alias is the program it renames. Link the actual in the
8601 -- original generic tree with the node in the analyzed tree.
8603 while Present (Act2) loop
8604 Subp := Entity (Selector_Name (Act2));
8605 Def := Explicit_Generic_Actual_Parameter (Act2);
8607 -- Following test is defence against rubbish errors
8609 if No (Alias (Subp)) then
8613 -- Retrieve the resolved actual from the renaming declaration
8614 -- created for the instantiated formal.
8616 Actual := Entity (Name (Parent (Parent (Subp))));
8617 Set_Entity (Def, Actual);
8618 Set_Etype (Def, Etype (Actual));
8620 if Is_Global (Actual) then
8622 Make_Generic_Association (Loc,
8623 Selector_Name => New_Occurrence_Of (Subp, Loc),
8624 Explicit_Generic_Actual_Parameter =>
8625 New_Occurrence_Of (Actual, Loc));
8628 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8630 Append (Ndec, Assoc1);
8632 -- If there are other defaults, add a dummy association
8633 -- in case there are other defaulted formals with the same
8636 elsif Present (Next (Act2)) then
8638 Make_Generic_Association (Loc,
8639 Selector_Name => New_Occurrence_Of (Subp, Loc),
8640 Explicit_Generic_Actual_Parameter => Empty);
8642 Append (Ndec, Assoc1);
8649 if Nkind (Name (N1)) = N_Identifier
8650 and then Is_Child_Unit (Gen_Id)
8651 and then Is_Global (Gen_Id)
8652 and then Is_Generic_Unit (Scope (Gen_Id))
8653 and then In_Open_Scopes (Scope (Gen_Id))
8655 -- This is an instantiation of a child unit within a sibling,
8656 -- so that the generic parent is in scope. An eventual instance
8657 -- must occur within the scope of an instance of the parent.
8658 -- Make name in instance into an expanded name, to preserve the
8659 -- identifier of the parent, so it can be resolved subsequently.
8662 Make_Expanded_Name (Loc,
8663 Chars => Chars (Gen_Id),
8664 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8665 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8666 Set_Entity (Name (N2), Gen_Id);
8669 Make_Expanded_Name (Loc,
8670 Chars => Chars (Gen_Id),
8671 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8672 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8674 Set_Associated_Node (Name (N1), Name (N2));
8675 Set_Associated_Node (Prefix (Name (N1)), Empty);
8677 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8678 Set_Etype (Name (N1), Etype (Gen_Id));
8681 end Save_Global_Defaults;
8683 ----------------------------
8684 -- Save_Global_Descendant --
8685 ----------------------------
8687 procedure Save_Global_Descendant (D : Union_Id) is
8691 if D in Node_Range then
8692 if D = Union_Id (Empty) then
8695 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8696 Save_References (Node_Id (D));
8699 elsif D in List_Range then
8700 if D = Union_Id (No_List)
8701 or else Is_Empty_List (List_Id (D))
8706 N1 := First (List_Id (D));
8707 while Present (N1) loop
8708 Save_References (N1);
8713 -- Element list or other non-node field, nothing to do
8718 end Save_Global_Descendant;
8720 ---------------------
8721 -- Save_References --
8722 ---------------------
8724 -- This is the recursive procedure that does the work, once the
8725 -- enclosing generic scope has been established. We have to treat
8726 -- specially a number of node rewritings that are required by semantic
8727 -- processing and which change the kind of nodes in the generic copy:
8728 -- typically constant-folding, replacing an operator node by a string
8729 -- literal, or a selected component by an expanded name. In each of
8730 -- those cases, the transformation is propagated to the generic unit.
8732 procedure Save_References (N : Node_Id) is
8737 elsif (Nkind (N) = N_Character_Literal
8738 or else Nkind (N) = N_Operator_Symbol)
8740 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8743 elsif Nkind (N) = N_Operator_Symbol
8744 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
8746 Change_Operator_Symbol_To_String_Literal (N);
8749 elsif Nkind (N) in N_Op then
8751 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8753 if Nkind (N) = N_Op_Concat then
8754 Set_Is_Component_Left_Opnd (N,
8755 Is_Component_Left_Opnd (Get_Associated_Node (N)));
8757 Set_Is_Component_Right_Opnd (N,
8758 Is_Component_Right_Opnd (Get_Associated_Node (N)));
8763 -- Node may be transformed into call to a user-defined operator
8765 N2 := Get_Associated_Node (N);
8767 if Nkind (N2) = N_Function_Call then
8768 E := Entity (Name (N2));
8771 and then Is_Global (E)
8773 Set_Etype (N, Etype (N2));
8775 Set_Associated_Node (N, Empty);
8776 Set_Etype (N, Empty);
8779 elsif Nkind (N2) = N_Integer_Literal
8780 or else Nkind (N2) = N_Real_Literal
8781 or else Nkind (N2) = N_String_Literal
8782 or else (Nkind (N2) = N_Identifier
8784 Ekind (Entity (N2)) = E_Enumeration_Literal)
8786 -- Operation was constant-folded, perform the same
8787 -- replacement in generic.
8789 -- Note: we do a Replace here rather than a Rewrite,
8790 -- which is a definite violation of the standard rules
8791 -- with regard to retrievability of the original tree,
8792 -- and likely ASIS bugs or at least irregularities are
8793 -- caused by this choice.
8795 -- The reason we do this is that the appropriate original
8796 -- nodes are never constructed (we don't go applying the
8797 -- generic instantiation to rewritten nodes in general).
8798 -- We could try to create an appropriate copy but it would
8799 -- be hard work and does not seem worth while, because
8800 -- the original expression is accessible in the generic,
8801 -- and ASIS rules for traversing instances are fuzzy.
8803 Replace (N, New_Copy (N2));
8804 Set_Analyzed (N, False);
8808 -- Complete the check on operands, if node has not been
8811 if Nkind (N) in N_Op then
8812 Save_Entity_Descendants (N);
8815 elsif Nkind (N) = N_Identifier then
8816 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8818 -- If this is a discriminant reference, always save it.
8819 -- It is used in the instance to find the corresponding
8820 -- discriminant positionally rather than by name.
8822 Set_Original_Discriminant
8823 (N, Original_Discriminant (Get_Associated_Node (N)));
8827 N2 := Get_Associated_Node (N);
8829 if Nkind (N2) = N_Function_Call then
8830 E := Entity (Name (N2));
8832 -- Name resolves to a call to parameterless function.
8833 -- If original entity is global, mark node as resolved.
8836 and then Is_Global (E)
8838 Set_Etype (N, Etype (N2));
8840 Set_Associated_Node (N, Empty);
8841 Set_Etype (N, Empty);
8845 Nkind (N2) = N_Integer_Literal or else
8846 Nkind (N2) = N_Real_Literal or else
8847 Nkind (N2) = N_String_Literal
8849 -- Name resolves to named number that is constant-folded,
8850 -- or to string literal from concatenation.
8851 -- Perform the same replacement in generic.
8853 Rewrite (N, New_Copy (N2));
8854 Set_Analyzed (N, False);
8856 elsif Nkind (N2) = N_Explicit_Dereference then
8858 -- An identifier is rewritten as a dereference if it is
8859 -- the prefix in a selected component, and it denotes an
8860 -- access to a composite type, or a parameterless function
8861 -- call that returns an access type.
8863 -- Check whether corresponding entity in prefix is global.
8865 if Is_Entity_Name (Prefix (N2))
8866 and then Present (Entity (Prefix (N2)))
8867 and then Is_Global (Entity (Prefix (N2)))
8870 Make_Explicit_Dereference (Sloc (N),
8871 Prefix => Make_Identifier (Sloc (N),
8872 Chars => Chars (N))));
8873 Set_Associated_Node (Prefix (N), Prefix (N2));
8875 elsif Nkind (Prefix (N2)) = N_Function_Call
8876 and then Is_Global (Entity (Name (Prefix (N2))))
8879 Make_Explicit_Dereference (Sloc (N),
8880 Prefix => Make_Function_Call (Sloc (N),
8882 Make_Identifier (Sloc (N),
8883 Chars => Chars (N)))));
8886 (Name (Prefix (N)), Name (Prefix (N2)));
8889 Set_Associated_Node (N, Empty);
8890 Set_Etype (N, Empty);
8893 -- The subtype mark of a nominally unconstrained object
8894 -- is rewritten as a subtype indication using the bounds
8895 -- of the expression. Recover the original subtype mark.
8897 elsif Nkind (N2) = N_Subtype_Indication
8898 and then Is_Entity_Name (Original_Node (N2))
8900 Set_Associated_Node (N, Original_Node (N2));
8908 elsif Nkind (N) in N_Entity then
8913 use Atree.Unchecked_Access;
8914 -- This code section is part of implementing an untyped tree
8915 -- traversal, so it needs direct access to node fields.
8918 if Nkind (N) = N_Aggregate
8920 Nkind (N) = N_Extension_Aggregate
8922 N2 := Get_Associated_Node (N);
8925 or else No (Etype (N2))
8926 or else not Is_Global (Etype (N2))
8928 Set_Associated_Node (N, Empty);
8931 Save_Global_Descendant (Field1 (N));
8932 Save_Global_Descendant (Field2 (N));
8933 Save_Global_Descendant (Field3 (N));
8934 Save_Global_Descendant (Field5 (N));
8936 -- All other cases than aggregates
8939 Save_Global_Descendant (Field1 (N));
8940 Save_Global_Descendant (Field2 (N));
8941 Save_Global_Descendant (Field3 (N));
8942 Save_Global_Descendant (Field4 (N));
8943 Save_Global_Descendant (Field5 (N));
8947 end Save_References;
8949 -- Start of processing for Save_Global_References
8952 Gen_Scope := Current_Scope;
8954 -- If the generic unit is a child unit, references to entities in
8955 -- the parent are treated as local, because they will be resolved
8956 -- anew in the context of the instance of the parent.
8958 while Is_Child_Unit (Gen_Scope)
8959 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8961 Gen_Scope := Scope (Gen_Scope);
8964 Save_References (N);
8965 end Save_Global_References;
8967 ---------------------
8968 -- Set_Copied_Sloc --
8969 ---------------------
8971 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8973 Create_Instantiation_Source (N, E, S_Adjustment);
8974 end Set_Copied_Sloc;
8976 ---------------------
8977 -- Set_Instance_Of --
8978 ---------------------
8980 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8982 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8983 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8984 Generic_Renamings.Increment_Last;
8985 end Set_Instance_Of;
8987 --------------------
8988 -- Set_Next_Assoc --
8989 --------------------
8991 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8993 Generic_Renamings.Table (E).Next_In_HTable := Next;
9000 procedure Start_Generic is
9002 -- ??? I am sure more things could be factored out in this
9003 -- routine. Should probably be done at a later stage.
9005 Generic_Flags.Increment_Last;
9006 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9007 Inside_A_Generic := True;
9009 Expander_Mode_Save_And_Set (False);
9016 procedure Switch_View (T : Entity_Id) is
9017 Priv_Elmt : Elmt_Id := No_Elmt;
9018 Priv_Sub : Entity_Id;
9019 BT : Entity_Id := Base_Type (T);
9022 -- T may be private but its base type may have been exchanged through
9023 -- some other occurrence, in which case there is nothing to switch.
9025 if not Is_Private_Type (BT) then
9029 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9031 if Present (Full_View (BT)) then
9032 Append_Elmt (Full_View (BT), Exchanged_Views);
9033 Exchange_Declarations (BT);
9036 while Present (Priv_Elmt) loop
9037 Priv_Sub := (Node (Priv_Elmt));
9039 -- We avoid flipping the subtype if the Etype of its full
9040 -- view is private because this would result in a malformed
9041 -- subtype. This occurs when the Etype of the subtype full
9042 -- view is the full view of the base type (and since the
9043 -- base types were just switched, the subtype is pointing
9044 -- to the wrong view). This is currently the case for
9045 -- tagged record types, access types (maybe more?) and
9046 -- needs to be resolved. ???
9048 if Present (Full_View (Priv_Sub))
9049 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
9051 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
9052 Exchange_Declarations (Priv_Sub);
9055 Next_Elmt (Priv_Elmt);
9059 -----------------------------
9060 -- Valid_Default_Attribute --
9061 -----------------------------
9063 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
9064 Attr_Id : constant Attribute_Id :=
9065 Get_Attribute_Id (Attribute_Name (Def));
9068 T : Entity_Id := Entity (Prefix (Def));
9070 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
9080 F := First_Formal (Nam);
9081 while Present (F) loop
9087 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
9088 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
9089 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
9090 Attribute_Unbiased_Rounding =>
9091 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
9093 when Attribute_Image | Attribute_Pred | Attribute_Succ |
9094 Attribute_Value | Attribute_Wide_Image |
9095 Attribute_Wide_Value =>
9096 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9098 when Attribute_Max | Attribute_Min =>
9099 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
9101 when Attribute_Input =>
9102 OK := (Is_Fun and then Num_F = 1);
9104 when Attribute_Output | Attribute_Read | Attribute_Write =>
9105 OK := (not Is_Fun and then Num_F = 2);
9107 when others => OK := False;
9111 Error_Msg_N ("attribute reference has wrong profile for subprogram",
9114 end Valid_Default_Attribute;