1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2003, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Restrict; use Restrict;
44 with Rtsfind; use Rtsfind;
46 with Sem_Cat; use Sem_Cat;
47 with Sem_Ch3; use Sem_Ch3;
48 with Sem_Ch6; use Sem_Ch6;
49 with Sem_Ch7; use Sem_Ch7;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Ch10; use Sem_Ch10;
52 with Sem_Ch13; use Sem_Ch13;
53 with Sem_Elab; use Sem_Elab;
54 with Sem_Elim; use Sem_Elim;
55 with Sem_Eval; use Sem_Eval;
56 with Sem_Res; use Sem_Res;
57 with Sem_Type; use Sem_Type;
58 with Sem_Util; use Sem_Util;
59 with Sem_Warn; use Sem_Warn;
60 with Stand; use Stand;
61 with Sinfo; use Sinfo;
62 with Sinfo.CN; use Sinfo.CN;
63 with Sinput; use Sinput;
64 with Sinput.L; use Sinput.L;
65 with Snames; use Snames;
66 with Stringt; use Stringt;
67 with Uname; use Uname;
69 with Tbuild; use Tbuild;
70 with Uintp; use Uintp;
71 with Urealp; use Urealp;
75 package body Sem_Ch12 is
77 ----------------------------------------------------------
78 -- Implementation of Generic Analysis and Instantiation --
79 -----------------------------------------------------------
81 -- GNAT implements generics by macro expansion. No attempt is made to
82 -- share generic instantiations (for now). Analysis of a generic definition
83 -- does not perform any expansion action, but the expander must be called
84 -- on the tree for each instantiation, because the expansion may of course
85 -- depend on the generic actuals. All of this is best achieved as follows:
87 -- a) Semantic analysis of a generic unit is performed on a copy of the
88 -- tree for the generic unit. All tree modifications that follow analysis
89 -- do not affect the original tree. Links are kept between the original
90 -- tree and the copy, in order to recognize non-local references within
91 -- the generic, and propagate them to each instance (recall that name
92 -- resolution is done on the generic declaration: generics are not really
93 -- macros!). This is summarized in the following diagram:
95 -- .-----------. .----------.
96 -- | semantic |<--------------| generic |
98 -- | |==============>| |
99 -- |___________| global |__________|
110 -- b) Each instantiation copies the original tree, and inserts into it a
111 -- series of declarations that describe the mapping between generic formals
112 -- and actuals. For example, a generic In OUT parameter is an object
113 -- renaming of the corresponing actual, etc. Generic IN parameters are
114 -- constant declarations.
116 -- c) In order to give the right visibility for these renamings, we use
117 -- a different scheme for package and subprogram instantiations. For
118 -- packages, the list of renamings is inserted into the package
119 -- specification, before the visible declarations of the package. The
120 -- renamings are analyzed before any of the text of the instance, and are
121 -- thus visible at the right place. Furthermore, outside of the instance,
122 -- the generic parameters are visible and denote their corresponding
125 -- For subprograms, we create a container package to hold the renamings
126 -- and the subprogram instance itself. Analysis of the package makes the
127 -- renaming declarations visible to the subprogram. After analyzing the
128 -- package, the defining entity for the subprogram is touched-up so that
129 -- it appears declared in the current scope, and not inside the container
132 -- If the instantiation is a compilation unit, the container package is
133 -- given the same name as the subprogram instance. This ensures that
134 -- the elaboration procedure called by the binder, using the compilation
135 -- unit name, calls in fact the elaboration procedure for the package.
137 -- Not surprisingly, private types complicate this approach. By saving in
138 -- the original generic object the non-local references, we guarantee that
139 -- the proper entities are referenced at the point of instantiation.
140 -- However, for private types, this by itself does not insure that the
141 -- proper VIEW of the entity is used (the full type may be visible at the
142 -- point of generic definition, but not at instantiation, or vice-versa).
143 -- In order to reference the proper view, we special-case any reference
144 -- to private types in the generic object, by saving both views, one in
145 -- the generic and one in the semantic copy. At time of instantiation, we
146 -- check whether the two views are consistent, and exchange declarations if
147 -- necessary, in order to restore the correct visibility. Similarly, if
148 -- the instance view is private when the generic view was not, we perform
149 -- the exchange. After completing the instantiation, we restore the
150 -- current visibility. The flag Has_Private_View marks identifiers in the
151 -- the generic unit that require checking.
153 -- Visibility within nested generic units requires special handling.
154 -- Consider the following scheme:
156 -- type Global is ... -- outside of generic unit.
160 -- type Semi_Global is ... -- global to inner.
163 -- procedure inner (X1 : Global; X2 : Semi_Global);
165 -- procedure in2 is new inner (...); -- 4
168 -- package New_Outer is new Outer (...); -- 2
169 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
171 -- The semantic analysis of Outer captures all occurrences of Global.
172 -- The semantic analysis of Inner (at 1) captures both occurrences of
173 -- Global and Semi_Global.
175 -- At point 2 (instantiation of Outer), we also produce a generic copy
176 -- of Inner, even though Inner is, at that point, not being instantiated.
177 -- (This is just part of the semantic analysis of New_Outer).
179 -- Critically, references to Global within Inner must be preserved, while
180 -- references to Semi_Global should not preserved, because they must now
181 -- resolve to an entity within New_Outer. To distinguish between these, we
182 -- use a global variable, Current_Instantiated_Parent, which is set when
183 -- performing a generic copy during instantiation (at 2). This variable is
184 -- used when performing a generic copy that is not an instantiation, but
185 -- that is nested within one, as the occurrence of 1 within 2. The analysis
186 -- of a nested generic only preserves references that are global to the
187 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
188 -- determine whether a reference is external to the given parent.
190 -- The instantiation at point 3 requires no special treatment. The method
191 -- works as well for further nestings of generic units, but of course the
192 -- variable Current_Instantiated_Parent must be stacked because nested
193 -- instantiations can occur, e.g. the occurrence of 4 within 2.
195 -- The instantiation of package and subprogram bodies is handled in a
196 -- similar manner, except that it is delayed until after semantic
197 -- analysis is complete. In this fashion complex cross-dependencies
198 -- between several package declarations and bodies containing generics
199 -- can be compiled which otherwise would diagnose spurious circularities.
201 -- For example, it is possible to compile two packages A and B that
202 -- have the following structure:
204 -- package A is package B is
205 -- generic ... generic ...
206 -- package G_A is package G_B is
209 -- package body A is package body B is
210 -- package N_B is new G_B (..) package N_A is new G_A (..)
212 -- The table Pending_Instantiations in package Inline is used to keep
213 -- track of body instantiations that are delayed in this manner. Inline
214 -- handles the actual calls to do the body instantiations. This activity
215 -- is part of Inline, since the processing occurs at the same point, and
216 -- for essentially the same reason, as the handling of inlined routines.
218 ----------------------------------------------
219 -- Detection of Instantiation Circularities --
220 ----------------------------------------------
222 -- If we have a chain of instantiations that is circular, this is a
223 -- static error which must be detected at compile time. The detection
224 -- of these circularities is carried out at the point that we insert
225 -- a generic instance spec or body. If there is a circularity, then
226 -- the analysis of the offending spec or body will eventually result
227 -- in trying to load the same unit again, and we detect this problem
228 -- as we analyze the package instantiation for the second time.
230 -- At least in some cases after we have detected the circularity, we
231 -- get into trouble if we try to keep going. The following flag is
232 -- set if a circularity is detected, and used to abandon compilation
233 -- after the messages have been posted.
235 Circularity_Detected : Boolean := False;
236 -- This should really be reset on encountering a new main unit, but in
237 -- practice we are not using multiple main units so it is not critical.
239 -----------------------
240 -- Local subprograms --
241 -----------------------
243 procedure Abandon_Instantiation (N : Node_Id);
244 pragma No_Return (Abandon_Instantiation);
245 -- Posts an error message "instantiation abandoned" at the indicated
246 -- node and then raises the exception Instantiation_Error to do it.
248 procedure Analyze_Formal_Array_Type
249 (T : in out Entity_Id;
251 -- A formal array type is treated like an array type declaration, and
252 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
253 -- in-out, because in the case of an anonymous type the entity is
254 -- actually created in the procedure.
256 -- The following procedures treat other kinds of formal parameters.
258 procedure Analyze_Formal_Derived_Type
263 -- All the following need comments???
265 procedure Analyze_Formal_Decimal_Fixed_Point_Type
266 (T : Entity_Id; Def : Node_Id);
267 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
272 (T : Entity_Id; Def : Node_Id);
274 procedure Analyze_Formal_Private_Type
278 -- This needs comments???
280 procedure Analyze_Generic_Formal_Part (N : Node_Id);
282 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
283 -- This needs comments ???
285 function Analyze_Associations
290 -- At instantiation time, build the list of associations between formals
291 -- and actuals. Each association becomes a renaming declaration for the
292 -- formal entity. F_Copy is the analyzed list of formals in the generic
293 -- copy. It is used to apply legality checks to the actuals. I_Node is the
294 -- instantiation node itself.
296 procedure Analyze_Subprogram_Instantiation
300 procedure Build_Instance_Compilation_Unit_Nodes
304 -- This procedure is used in the case where the generic instance of a
305 -- subprogram body or package body is a library unit. In this case, the
306 -- original library unit node for the generic instantiation must be
307 -- replaced by the resulting generic body, and a link made to a new
308 -- compilation unit node for the generic declaration. The argument N is
309 -- the original generic instantiation. Act_Body and Act_Decl are the body
310 -- and declaration of the instance (either package body and declaration
311 -- nodes or subprogram body and declaration nodes depending on the case).
312 -- On return, the node N has been rewritten with the actual body.
314 procedure Check_Formal_Packages (P_Id : Entity_Id);
315 -- Apply the following to all formal packages in generic associations.
317 procedure Check_Formal_Package_Instance
318 (Formal_Pack : Entity_Id;
319 Actual_Pack : Entity_Id);
320 -- Verify that the actuals of the actual instance match the actuals of
321 -- the template for a formal package that is not declared with a box.
323 procedure Check_Forward_Instantiation (Decl : Node_Id);
324 -- If the generic is a local entity and the corresponding body has not
325 -- been seen yet, flag enclosing packages to indicate that it will be
326 -- elaborated after the generic body. Subprograms declared in the same
327 -- package cannot be inlined by the front-end because front-end inlining
328 -- requires a strict linear order of elaboration.
330 procedure Check_Hidden_Child_Unit
332 Gen_Unit : Entity_Id;
333 Act_Decl_Id : Entity_Id);
334 -- If the generic unit is an implicit child instance within a parent
335 -- instance, we need to make an explicit test that it is not hidden by
336 -- a child instance of the same name and parent.
338 procedure Check_Private_View (N : Node_Id);
339 -- Check whether the type of a generic entity has a different view between
340 -- the point of generic analysis and the point of instantiation. If the
341 -- view has changed, then at the point of instantiation we restore the
342 -- correct view to perform semantic analysis of the instance, and reset
343 -- the current view after instantiation. The processing is driven by the
344 -- current private status of the type of the node, and Has_Private_View,
345 -- a flag that is set at the point of generic compilation. If view and
346 -- flag are inconsistent then the type is updated appropriately.
348 procedure Check_Generic_Actuals
349 (Instance : Entity_Id;
350 Is_Formal_Box : Boolean);
351 -- Similar to previous one. Check the actuals in the instantiation,
352 -- whose views can change between the point of instantiation and the point
353 -- of instantiation of the body. In addition, mark the generic renamings
354 -- as generic actuals, so that they are not compatible with other actuals.
355 -- Recurse on an actual that is a formal package whose declaration has
358 function Contains_Instance_Of
363 -- Inner is instantiated within the generic Outer. Check whether Inner
364 -- directly or indirectly contains an instance of Outer or of one of its
365 -- parents, in the case of a subunit. Each generic unit holds a list of
366 -- the entities instantiated within (at any depth). This procedure
367 -- determines whether the set of such lists contains a cycle, i.e. an
368 -- illegal circular instantiation.
370 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
371 -- Returns True if E is a formal package of an enclosing generic, or
372 -- the actual for such a formal in an enclosing instantiation. Used in
373 -- Restore_Private_Views, to keep the formals of such a package visible
374 -- on exit from an inner instantiation.
376 function Find_Actual_Type
378 Gen_Scope : Entity_Id)
380 -- When validating the actual types of a child instance, check whether
381 -- the formal is a formal type of the parent unit, and retrieve the current
382 -- actual for it. Typ is the entity in the analyzed formal type declaration
383 -- (component or index type of an array type) and Gen_Scope is the scope of
384 -- the analyzed formal array type.
386 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
387 -- Given the entity of a unit that is an instantiation, retrieve the
388 -- original instance node. This is used when loading the instantiations
389 -- of the ancestors of a child generic that is being instantiated.
391 function In_Same_Declarative_Part
395 -- True if the instantiation Inst and the given freeze_node F_Node appear
396 -- within the same declarative part, ignoring subunits, but with no inter-
397 -- vening suprograms or concurrent units. If true, the freeze node
398 -- of the instance can be placed after the freeze node of the parent,
399 -- which it itself an instance.
401 procedure Set_Instance_Env
402 (Gen_Unit : Entity_Id;
403 Act_Unit : Entity_Id);
404 -- Save current instance on saved environment, to be used to determine
405 -- the global status of entities in nested instances. Part of Save_Env.
406 -- called after verifying that the generic unit is legal for the instance.
408 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
409 -- Associate analyzed generic parameter with corresponding
410 -- instance. Used for semantic checks at instantiation time.
412 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
413 -- Traverse the Exchanged_Views list to see if a type was private
414 -- and has already been flipped during this phase of instantiation.
416 procedure Hide_Current_Scope;
417 -- When compiling a generic child unit, the parent context must be
418 -- present, but the instance and all entities that may be generated
419 -- must be inserted in the current scope. We leave the current scope
420 -- on the stack, but make its entities invisible to avoid visibility
421 -- problems. This is reversed at the end of instantiations. This is
422 -- not done for the instantiation of the bodies, which only require the
423 -- instances of the generic parents to be in scope.
425 procedure Install_Body
430 -- If the instantiation happens textually before the body of the generic,
431 -- the instantiation of the body must be analyzed after the generic body,
432 -- and not at the point of instantiation. Such early instantiations can
433 -- happen if the generic and the instance appear in a package declaration
434 -- because the generic body can only appear in the corresponding package
435 -- body. Early instantiations can also appear if generic, instance and
436 -- body are all in the declarative part of a subprogram or entry. Entities
437 -- of packages that are early instantiations are delayed, and their freeze
438 -- node appears after the generic body.
440 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
441 -- Insert freeze node at the end of the declarative part that includes the
442 -- instance node N. If N is in the visible part of an enclosing package
443 -- declaration, the freeze node has to be inserted at the end of the
444 -- private declarations, if any.
446 procedure Freeze_Subprogram_Body
447 (Inst_Node : Node_Id;
449 Pack_Id : Entity_Id);
450 -- The generic body may appear textually after the instance, including
451 -- in the proper body of a stub, or within a different package instance.
452 -- Given that the instance can only be elaborated after the generic, we
453 -- place freeze_nodes for the instance and/or for packages that may enclose
454 -- the instance and the generic, so that the back-end can establish the
455 -- proper order of elaboration.
458 -- Establish environment for subsequent instantiation. Separated from
459 -- Save_Env because data-structures for visibility handling must be
460 -- initialized before call to Check_Generic_Child_Unit.
462 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
463 -- When compiling an instance of a child unit the parent (which is
464 -- itself an instance) is an enclosing scope that must be made
465 -- immediately visible. This procedure is also used to install the non-
466 -- generic parent of a generic child unit when compiling its body, so that
467 -- full views of types in the parent are made visible.
469 procedure Remove_Parent (In_Body : Boolean := False);
470 -- Reverse effect after instantiation of child is complete.
472 procedure Inline_Instance_Body
474 Gen_Unit : Entity_Id;
476 -- If front-end inlining is requested, instantiate the package body,
477 -- and preserve the visibility of its compilation unit, to insure
478 -- that successive instantiations succeed.
480 -- The functions Instantiate_XXX perform various legality checks and build
481 -- the declarations for instantiated generic parameters.
482 -- Need to describe what the parameters are ???
484 function Instantiate_Object
487 Analyzed_Formal : Node_Id)
490 function Instantiate_Type
493 Analyzed_Formal : Node_Id;
494 Actual_Decls : List_Id)
497 function Instantiate_Formal_Subprogram
500 Analyzed_Formal : Node_Id)
503 function Instantiate_Formal_Package
506 Analyzed_Formal : Node_Id)
508 -- If the formal package is declared with a box, special visibility rules
509 -- apply to its formals: they are in the visible part of the package. This
510 -- is true in the declarative region of the formal package, that is to say
511 -- in the enclosing generic or instantiation. For an instantiation, the
512 -- parameters of the formal package are made visible in an explicit step.
513 -- Furthermore, if the actual is a visible use_clause, these formals must
514 -- be made potentially use_visible as well. On exit from the enclosing
515 -- instantiation, the reverse must be done.
517 -- For a formal package declared without a box, there are conformance rules
518 -- that apply to the actuals in the generic declaration and the actuals of
519 -- the actual package in the enclosing instantiation. The simplest way to
520 -- apply these rules is to repeat the instantiation of the formal package
521 -- in the context of the enclosing instance, and compare the generic
522 -- associations of this instantiation with those of the actual package.
524 function Is_In_Main_Unit (N : Node_Id) return Boolean;
525 -- Test if given node is in the main unit
527 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
528 -- If the generic appears in a separate non-generic library unit,
529 -- load the corresponding body to retrieve the body of the generic.
530 -- N is the node for the generic instantiation, Spec is the generic
531 -- package declaration.
533 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
534 -- Add the context clause of the unit containing a generic unit to
535 -- an instantiation that is a compilation unit.
537 function Get_Associated_Node (N : Node_Id) return Node_Id;
538 -- In order to propagate semantic information back from the analyzed
539 -- copy to the original generic, we maintain links between selected nodes
540 -- in the generic and their corresponding copies. At the end of generic
541 -- analysis, the routine Save_Global_References traverses the generic
542 -- tree, examines the semantic information, and preserves the links to
543 -- those nodes that contain global information. At instantiation, the
544 -- information from the associated node is placed on the new copy, so
545 -- that name resolution is not repeated.
547 -- Three kinds of source nodes have associated nodes:
549 -- a) those that can reference (denote) entities, that is identifiers,
550 -- character literals, expanded_names, operator symbols, operators,
551 -- and attribute reference nodes. These nodes have an Entity field
552 -- and are the set of nodes that are in N_Has_Entity.
554 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
556 -- c) selected components (N_Selected_Component)
558 -- For the first class, the associated node preserves the entity if it is
559 -- global. If the generic contains nested instantiations, the associated
560 -- node itself has been recopied, and a chain of them must be followed.
562 -- For aggregates, the associated node allows retrieval of the type, which
563 -- may otherwise not appear in the generic. The view of this type may be
564 -- different between generic and instantiation, and the full view can be
565 -- installed before the instantiation is analyzed. For aggregates of
566 -- type extensions, the same view exchange may have to be performed for
567 -- some of the ancestor types, if their view is private at the point of
570 -- Nodes that are selected components in the parse tree may be rewritten
571 -- as expanded names after resolution, and must be treated as potential
572 -- entity holders. which is why they also have an Associated_Node.
574 -- Nodes that do not come from source, such as freeze nodes, do not appear
575 -- in the generic tree, and need not have an associated node.
577 -- The associated node is stored in the Associated_Node field. Note that
578 -- this field overlaps Entity, which is fine, because the whole point is
579 -- that we don't need or want the normal Entity field in this situation.
581 procedure Move_Freeze_Nodes
585 -- Freeze nodes can be generated in the analysis of a generic unit, but
586 -- will not be seen by the back-end. It is necessary to move those nodes
587 -- to the enclosing scope if they freeze an outer entity. We place them
588 -- at the end of the enclosing generic package, which is semantically
591 procedure Pre_Analyze_Actuals (N : Node_Id);
592 -- Analyze actuals to perform name resolution. Full resolution is done
593 -- later, when the expected types are known, but names have to be captured
594 -- before installing parents of generics, that are not visible for the
595 -- actuals themselves.
597 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
598 -- Verify that an attribute that appears as the default for a formal
599 -- subprogram is a function or procedure with the correct profile.
601 -------------------------------------------
602 -- Data Structures for Generic Renamings --
603 -------------------------------------------
605 -- The map Generic_Renamings associates generic entities with their
606 -- corresponding actuals. Currently used to validate type instances.
607 -- It will eventually be used for all generic parameters to eliminate
608 -- the need for overload resolution in the instance.
610 type Assoc_Ptr is new Int;
612 Assoc_Null : constant Assoc_Ptr := -1;
617 Next_In_HTable : Assoc_Ptr;
620 package Generic_Renamings is new Table.Table
621 (Table_Component_Type => Assoc,
622 Table_Index_Type => Assoc_Ptr,
623 Table_Low_Bound => 0,
625 Table_Increment => 100,
626 Table_Name => "Generic_Renamings");
628 -- Variable to hold enclosing instantiation. When the environment is
629 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
631 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
633 -- Hash table for associations
635 HTable_Size : constant := 37;
636 type HTable_Range is range 0 .. HTable_Size - 1;
638 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
639 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
640 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
641 function Hash (F : Entity_Id) return HTable_Range;
643 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
644 Header_Num => HTable_Range,
646 Elmt_Ptr => Assoc_Ptr,
647 Null_Ptr => Assoc_Null,
648 Set_Next => Set_Next_Assoc,
651 Get_Key => Get_Gen_Id,
655 Exchanged_Views : Elist_Id;
656 -- This list holds the private views that have been exchanged during
657 -- instantiation to restore the visibility of the generic declaration.
658 -- (see comments above). After instantiation, the current visibility is
659 -- reestablished by means of a traversal of this list.
661 Hidden_Entities : Elist_Id;
662 -- This list holds the entities of the current scope that are removed
663 -- from immediate visibility when instantiating a child unit. Their
664 -- visibility is restored in Remove_Parent.
666 -- Because instantiations can be recursive, the following must be saved
667 -- on entry and restored on exit from an instantiation (spec or body).
668 -- This is done by the two procedures Save_Env and Restore_Env. For
669 -- package and subprogram instantiations (but not for the body instances)
670 -- the action of Save_Env is done in two steps: Init_Env is called before
671 -- Check_Generic_Child_Unit, because setting the parent instances requires
672 -- that the visibility data structures be properly initialized. Once the
673 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
675 type Instance_Env is record
677 Instantiated_Parent : Assoc;
678 Exchanged_Views : Elist_Id;
679 Hidden_Entities : Elist_Id;
680 Current_Sem_Unit : Unit_Number_Type;
683 package Instance_Envs is new Table.Table (
684 Table_Component_Type => Instance_Env,
685 Table_Index_Type => Int,
686 Table_Low_Bound => 0,
688 Table_Increment => 100,
689 Table_Name => "Instance_Envs");
691 procedure Restore_Private_Views
692 (Pack_Id : Entity_Id;
693 Is_Package : Boolean := True);
694 -- Restore the private views of external types, and unmark the generic
695 -- renamings of actuals, so that they become comptible subtypes again.
696 -- For subprograms, Pack_Id is the package constructed to hold the
699 procedure Switch_View (T : Entity_Id);
700 -- Switch the partial and full views of a type and its private
701 -- dependents (i.e. its subtypes and derived types).
703 ------------------------------------
704 -- Structures for Error Reporting --
705 ------------------------------------
707 Instantiation_Node : Node_Id;
708 -- Used by subprograms that validate instantiation of formal parameters
709 -- where there might be no actual on which to place the error message.
710 -- Also used to locate the instantiation node for generic subunits.
712 Instantiation_Error : exception;
713 -- When there is a semantic error in the generic parameter matching,
714 -- there is no point in continuing the instantiation, because the
715 -- number of cascaded errors is unpredictable. This exception aborts
716 -- the instantiation process altogether.
718 S_Adjustment : Sloc_Adjustment;
719 -- Offset created for each node in an instantiation, in order to keep
720 -- track of the source position of the instantiation in each of its nodes.
721 -- A subsequent semantic error or warning on a construct of the instance
722 -- points to both places: the original generic node, and the point of
723 -- instantiation. See Sinput and Sinput.L for additional details.
725 ------------------------------------------------------------
726 -- Data structure for keeping track when inside a Generic --
727 ------------------------------------------------------------
729 -- The following table is used to save values of the Inside_A_Generic
730 -- flag (see spec of Sem) when they are saved by Start_Generic.
732 package Generic_Flags is new Table.Table (
733 Table_Component_Type => Boolean,
734 Table_Index_Type => Int,
735 Table_Low_Bound => 0,
737 Table_Increment => 200,
738 Table_Name => "Generic_Flags");
740 ---------------------------
741 -- Abandon_Instantiation --
742 ---------------------------
744 procedure Abandon_Instantiation (N : Node_Id) is
746 Error_Msg_N ("instantiation abandoned!", N);
747 raise Instantiation_Error;
748 end Abandon_Instantiation;
750 --------------------------
751 -- Analyze_Associations --
752 --------------------------
754 function Analyze_Associations
760 Actual_Types : constant Elist_Id := New_Elmt_List;
761 Assoc : constant List_Id := New_List;
762 Defaults : constant Elist_Id := New_Elmt_List;
763 Gen_Unit : constant Entity_Id := Defining_Entity
768 Next_Formal : Node_Id;
769 Temp_Formal : Node_Id;
770 Analyzed_Formal : Node_Id;
773 First_Named : Node_Id := Empty;
774 Found_Assoc : Node_Id;
775 Is_Named_Assoc : Boolean;
776 Num_Matched : Int := 0;
777 Num_Actuals : Int := 0;
779 function Matching_Actual
783 -- Find actual that corresponds to a given a formal parameter. If the
784 -- actuals are positional, return the next one, if any. If the actuals
785 -- are named, scan the parameter associations to find the right one.
786 -- A_F is the corresponding entity in the analyzed generic,which is
787 -- placed on the selector name for ASIS use.
789 procedure Set_Analyzed_Formal;
790 -- Find the node in the generic copy that corresponds to a given formal.
791 -- The semantic information on this node is used to perform legality
792 -- checks on the actuals. Because semantic analysis can introduce some
793 -- anonymous entities or modify the declaration node itself, the
794 -- correspondence between the two lists is not one-one. In addition to
795 -- anonymous types, the presence a formal equality will introduce an
796 -- implicit declaration for the corresponding inequality.
798 ---------------------
799 -- Matching_Actual --
800 ---------------------
802 function Matching_Actual
811 Is_Named_Assoc := False;
813 -- End of list of purely positional parameters
818 -- Case of positional parameter corresponding to current formal
820 elsif No (Selector_Name (Actual)) then
821 Found := Explicit_Generic_Actual_Parameter (Actual);
822 Found_Assoc := Actual;
823 Num_Matched := Num_Matched + 1;
826 -- Otherwise scan list of named actuals to find the one with the
827 -- desired name. All remaining actuals have explicit names.
830 Is_Named_Assoc := True;
834 while Present (Actual) loop
835 if Chars (Selector_Name (Actual)) = Chars (F) then
836 Found := Explicit_Generic_Actual_Parameter (Actual);
837 Set_Entity (Selector_Name (Actual), A_F);
838 Set_Etype (Selector_Name (Actual), Etype (A_F));
839 Generate_Reference (A_F, Selector_Name (Actual));
840 Found_Assoc := Actual;
841 Num_Matched := Num_Matched + 1;
849 -- Reset for subsequent searches. In most cases the named
850 -- associations are in order. If they are not, we reorder them
851 -- to avoid scanning twice the same actual. This is not just a
852 -- question of efficiency: there may be multiple defaults with
853 -- boxes that have the same name. In a nested instantiation we
854 -- insert actuals for those defaults, and cannot rely on their
855 -- names to disambiguate them.
857 if Actual = First_Named then
860 elsif Present (Actual) then
861 Insert_Before (First_Named, Remove_Next (Prev));
864 Actual := First_Named;
870 -------------------------
871 -- Set_Analyzed_Formal --
872 -------------------------
874 procedure Set_Analyzed_Formal is
877 while Present (Analyzed_Formal) loop
878 Kind := Nkind (Analyzed_Formal);
880 case Nkind (Formal) is
882 when N_Formal_Subprogram_Declaration =>
883 exit when Kind = N_Formal_Subprogram_Declaration
886 (Defining_Unit_Name (Specification (Formal))) =
888 (Defining_Unit_Name (Specification (Analyzed_Formal)));
890 when N_Formal_Package_Declaration =>
892 Kind = N_Formal_Package_Declaration
894 Kind = N_Generic_Package_Declaration;
896 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
900 -- Skip freeze nodes, and nodes inserted to replace
901 -- unrecognized pragmas.
904 Kind /= N_Formal_Subprogram_Declaration
905 and then Kind /= N_Subprogram_Declaration
906 and then Kind /= N_Freeze_Entity
907 and then Kind /= N_Null_Statement
908 and then Kind /= N_Itype_Reference
909 and then Chars (Defining_Identifier (Formal)) =
910 Chars (Defining_Identifier (Analyzed_Formal));
913 Next (Analyzed_Formal);
916 end Set_Analyzed_Formal;
918 -- Start of processing for Analyze_Associations
921 -- If named associations are present, save the first named association
922 -- (it may of course be Empty) to facilitate subsequent name search.
924 Actuals := Generic_Associations (I_Node);
926 if Present (Actuals) then
927 First_Named := First (Actuals);
929 while Present (First_Named)
930 and then No (Selector_Name (First_Named))
932 Num_Actuals := Num_Actuals + 1;
937 Named := First_Named;
938 while Present (Named) loop
939 if No (Selector_Name (Named)) then
940 Error_Msg_N ("invalid positional actual after named one", Named);
941 Abandon_Instantiation (Named);
944 -- A named association may lack an actual parameter, if it was
945 -- introduced for a default subprogram that turns out to be local
946 -- to the outer instantiation.
948 if Present (Explicit_Generic_Actual_Parameter (Named)) then
949 Num_Actuals := Num_Actuals + 1;
955 if Present (Formals) then
956 Formal := First_Non_Pragma (Formals);
957 Analyzed_Formal := First_Non_Pragma (F_Copy);
959 if Present (Actuals) then
960 Actual := First (Actuals);
962 -- All formals should have default values
968 while Present (Formal) loop
970 Next_Formal := Next_Non_Pragma (Formal);
972 case Nkind (Formal) is
973 when N_Formal_Object_Declaration =>
976 Defining_Identifier (Formal),
977 Defining_Identifier (Analyzed_Formal));
980 (Instantiate_Object (Formal, Match, Analyzed_Formal),
983 when N_Formal_Type_Declaration =>
986 Defining_Identifier (Formal),
987 Defining_Identifier (Analyzed_Formal));
990 Error_Msg_Sloc := Sloc (Gen_Unit);
993 Instantiation_Node, Defining_Identifier (Formal));
994 Error_Msg_NE ("\in instantiation of & declared#",
995 Instantiation_Node, Gen_Unit);
996 Abandon_Instantiation (Instantiation_Node);
1002 (Formal, Match, Analyzed_Formal, Assoc));
1004 -- an instantiation is a freeze point for the actuals,
1005 -- unless this is a rewritten formal package.
1007 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1008 Append_Elmt (Entity (Match), Actual_Types);
1012 -- A remote access-to-class-wide type must not be an
1013 -- actual parameter for a generic formal of an access
1014 -- type (E.2.2 (17)).
1016 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1018 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1019 N_Access_To_Object_Definition
1021 Validate_Remote_Access_To_Class_Wide_Type (Match);
1024 when N_Formal_Subprogram_Declaration =>
1027 Defining_Unit_Name (Specification (Formal)),
1028 Defining_Unit_Name (Specification (Analyzed_Formal)));
1030 -- If the formal subprogram has the same name as
1031 -- another formal subprogram of the generic, then
1032 -- a named association is illegal (12.3(9)). Exclude
1033 -- named associations that are generated for a nested
1037 and then Is_Named_Assoc
1038 and then Comes_From_Source (Found_Assoc)
1040 Temp_Formal := First (Formals);
1041 while Present (Temp_Formal) loop
1042 if Nkind (Temp_Formal) =
1043 N_Formal_Subprogram_Declaration
1044 and then Temp_Formal /= Formal
1046 Chars (Selector_Name (Found_Assoc)) =
1047 Chars (Defining_Unit_Name
1048 (Specification (Temp_Formal)))
1051 ("name not allowed for overloaded formal",
1053 Abandon_Instantiation (Instantiation_Node);
1061 Instantiate_Formal_Subprogram
1062 (Formal, Match, Analyzed_Formal));
1065 and then Box_Present (Formal)
1068 (Defining_Unit_Name (Specification (Last (Assoc))),
1072 when N_Formal_Package_Declaration =>
1075 Defining_Identifier (Formal),
1076 Defining_Identifier (Original_Node (Analyzed_Formal)));
1079 Error_Msg_Sloc := Sloc (Gen_Unit);
1082 Instantiation_Node, Defining_Identifier (Formal));
1083 Error_Msg_NE ("\in instantiation of & declared#",
1084 Instantiation_Node, Gen_Unit);
1086 Abandon_Instantiation (Instantiation_Node);
1091 (Instantiate_Formal_Package
1092 (Formal, Match, Analyzed_Formal),
1096 -- For use type and use package appearing in the context
1097 -- clause, we have already copied them, so we can just
1098 -- move them where they belong (we mustn't recopy them
1099 -- since this would mess up the Sloc values).
1101 when N_Use_Package_Clause |
1102 N_Use_Type_Clause =>
1104 Append (Formal, Assoc);
1107 raise Program_Error;
1111 Formal := Next_Formal;
1112 Next_Non_Pragma (Analyzed_Formal);
1115 if Num_Actuals > Num_Matched then
1116 Error_Msg_Sloc := Sloc (Gen_Unit);
1118 if Present (Selector_Name (Actual)) then
1120 ("unmatched actual&",
1121 Actual, Selector_Name (Actual));
1122 Error_Msg_NE ("\in instantiation of& declared#",
1126 ("unmatched actual in instantiation of& declared#",
1131 elsif Present (Actuals) then
1133 ("too many actuals in generic instantiation", Instantiation_Node);
1137 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1140 while Present (Elmt) loop
1141 Freeze_Before (I_Node, Node (Elmt));
1146 -- If there are default subprograms, normalize the tree by adding
1147 -- explicit associations for them. This is required if the instance
1148 -- appears within a generic.
1156 Elmt := First_Elmt (Defaults);
1157 while Present (Elmt) loop
1158 if No (Actuals) then
1159 Actuals := New_List;
1160 Set_Generic_Associations (I_Node, Actuals);
1163 Subp := Node (Elmt);
1165 Make_Generic_Association (Sloc (Subp),
1166 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1167 Explicit_Generic_Actual_Parameter =>
1168 New_Occurrence_Of (Subp, Sloc (Subp)));
1169 Mark_Rewrite_Insertion (New_D);
1170 Append_To (Actuals, New_D);
1176 end Analyze_Associations;
1178 -------------------------------
1179 -- Analyze_Formal_Array_Type --
1180 -------------------------------
1182 procedure Analyze_Formal_Array_Type
1183 (T : in out Entity_Id;
1189 -- Treated like a non-generic array declaration, with
1190 -- additional semantic checks.
1194 if Nkind (Def) = N_Constrained_Array_Definition then
1195 DSS := First (Discrete_Subtype_Definitions (Def));
1196 while Present (DSS) loop
1197 if Nkind (DSS) = N_Subtype_Indication
1198 or else Nkind (DSS) = N_Range
1199 or else Nkind (DSS) = N_Attribute_Reference
1201 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1208 Array_Type_Declaration (T, Def);
1209 Set_Is_Generic_Type (Base_Type (T));
1211 if Ekind (Component_Type (T)) = E_Incomplete_Type
1212 and then No (Full_View (Component_Type (T)))
1214 Error_Msg_N ("premature usage of incomplete type", Def);
1216 elsif Is_Internal (Component_Type (T))
1217 and then Nkind (Original_Node (Subtype_Indication (Def)))
1218 /= N_Attribute_Reference
1221 ("only a subtype mark is allowed in a formal",
1222 Subtype_Indication (Def));
1225 end Analyze_Formal_Array_Type;
1227 ---------------------------------------------
1228 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1229 ---------------------------------------------
1231 -- As for other generic types, we create a valid type representation
1232 -- with legal but arbitrary attributes, whose values are never considered
1233 -- static. For all scalar types we introduce an anonymous base type, with
1234 -- the same attributes. We choose the corresponding integer type to be
1235 -- Standard_Integer.
1237 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1241 Loc : constant Source_Ptr := Sloc (Def);
1242 Base : constant Entity_Id :=
1244 (E_Decimal_Fixed_Point_Type,
1245 Current_Scope, Sloc (Def), 'G');
1246 Int_Base : constant Entity_Id := Standard_Integer;
1247 Delta_Val : constant Ureal := Ureal_1;
1248 Digs_Val : constant Uint := Uint_6;
1253 Set_Etype (Base, Base);
1254 Set_Size_Info (Base, Int_Base);
1255 Set_RM_Size (Base, RM_Size (Int_Base));
1256 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1257 Set_Digits_Value (Base, Digs_Val);
1258 Set_Delta_Value (Base, Delta_Val);
1259 Set_Small_Value (Base, Delta_Val);
1260 Set_Scalar_Range (Base,
1262 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1263 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1265 Set_Is_Generic_Type (Base);
1266 Set_Parent (Base, Parent (Def));
1268 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1269 Set_Etype (T, Base);
1270 Set_Size_Info (T, Int_Base);
1271 Set_RM_Size (T, RM_Size (Int_Base));
1272 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1273 Set_Digits_Value (T, Digs_Val);
1274 Set_Delta_Value (T, Delta_Val);
1275 Set_Small_Value (T, Delta_Val);
1276 Set_Scalar_Range (T, Scalar_Range (Base));
1278 Check_Restriction (No_Fixed_Point, Def);
1279 end Analyze_Formal_Decimal_Fixed_Point_Type;
1281 ---------------------------------
1282 -- Analyze_Formal_Derived_Type --
1283 ---------------------------------
1285 procedure Analyze_Formal_Derived_Type
1290 Loc : constant Source_Ptr := Sloc (Def);
1291 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1295 Set_Is_Generic_Type (T);
1297 if Private_Present (Def) then
1299 Make_Private_Extension_Declaration (Loc,
1300 Defining_Identifier => T,
1301 Discriminant_Specifications => Discriminant_Specifications (N),
1302 Unknown_Discriminants_Present => Unk_Disc,
1303 Subtype_Indication => Subtype_Mark (Def));
1305 Set_Abstract_Present (New_N, Abstract_Present (Def));
1309 Make_Full_Type_Declaration (Loc,
1310 Defining_Identifier => T,
1311 Discriminant_Specifications =>
1312 Discriminant_Specifications (Parent (T)),
1314 Make_Derived_Type_Definition (Loc,
1315 Subtype_Indication => Subtype_Mark (Def)));
1317 Set_Abstract_Present
1318 (Type_Definition (New_N), Abstract_Present (Def));
1325 if not Is_Composite_Type (T) then
1327 ("unknown discriminants not allowed for elementary types", N);
1329 Set_Has_Unknown_Discriminants (T);
1330 Set_Is_Constrained (T, False);
1334 -- If the parent type has a known size, so does the formal, which
1335 -- makes legal representation clauses that involve the formal.
1337 Set_Size_Known_At_Compile_Time
1338 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1340 end Analyze_Formal_Derived_Type;
1342 ----------------------------------
1343 -- Analyze_Formal_Discrete_Type --
1344 ----------------------------------
1346 -- The operations defined for a discrete types are those of an
1347 -- enumeration type. The size is set to an arbitrary value, for use
1348 -- in analyzing the generic unit.
1350 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1351 Loc : constant Source_Ptr := Sloc (Def);
1357 Set_Ekind (T, E_Enumeration_Type);
1362 -- For semantic analysis, the bounds of the type must be set to some
1363 -- non-static value. The simplest is to create attribute nodes for
1364 -- those bounds, that refer to the type itself. These bounds are never
1365 -- analyzed but serve as place-holders.
1368 Make_Attribute_Reference (Loc,
1369 Attribute_Name => Name_First,
1370 Prefix => New_Reference_To (T, Loc));
1374 Make_Attribute_Reference (Loc,
1375 Attribute_Name => Name_Last,
1376 Prefix => New_Reference_To (T, Loc));
1379 Set_Scalar_Range (T,
1384 end Analyze_Formal_Discrete_Type;
1386 ----------------------------------
1387 -- Analyze_Formal_Floating_Type --
1388 ---------------------------------
1390 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1391 Base : constant Entity_Id :=
1393 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1396 -- The various semantic attributes are taken from the predefined type
1397 -- Float, just so that all of them are initialized. Their values are
1398 -- never used because no constant folding or expansion takes place in
1399 -- the generic itself.
1402 Set_Ekind (T, E_Floating_Point_Subtype);
1403 Set_Etype (T, Base);
1404 Set_Size_Info (T, (Standard_Float));
1405 Set_RM_Size (T, RM_Size (Standard_Float));
1406 Set_Digits_Value (T, Digits_Value (Standard_Float));
1407 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1409 Set_Is_Generic_Type (Base);
1410 Set_Etype (Base, Base);
1411 Set_Size_Info (Base, (Standard_Float));
1412 Set_RM_Size (Base, RM_Size (Standard_Float));
1413 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1414 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1415 Set_Parent (Base, Parent (Def));
1417 Check_Restriction (No_Floating_Point, Def);
1418 end Analyze_Formal_Floating_Type;
1420 ---------------------------------
1421 -- Analyze_Formal_Modular_Type --
1422 ---------------------------------
1424 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1426 -- Apart from their entity kind, generic modular types are treated
1427 -- like signed integer types, and have the same attributes.
1429 Analyze_Formal_Signed_Integer_Type (T, Def);
1430 Set_Ekind (T, E_Modular_Integer_Subtype);
1431 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1433 end Analyze_Formal_Modular_Type;
1435 ---------------------------------------
1436 -- Analyze_Formal_Object_Declaration --
1437 ---------------------------------------
1439 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1440 E : constant Node_Id := Expression (N);
1441 Id : constant Node_Id := Defining_Identifier (N);
1448 -- Determine the mode of the formal object
1450 if Out_Present (N) then
1451 K := E_Generic_In_Out_Parameter;
1453 if not In_Present (N) then
1454 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1458 K := E_Generic_In_Parameter;
1461 Find_Type (Subtype_Mark (N));
1462 T := Entity (Subtype_Mark (N));
1464 if Ekind (T) = E_Incomplete_Type then
1465 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1468 if K = E_Generic_In_Parameter then
1469 if Is_Limited_Type (T) then
1471 ("generic formal of mode IN must not be of limited type", N);
1472 Explain_Limited_Type (T, N);
1475 if Is_Abstract (T) then
1477 ("generic formal of mode IN must not be of abstract type", N);
1481 Analyze_Per_Use_Expression (E, T);
1487 -- Case of generic IN OUT parameter.
1490 -- If the formal has an unconstrained type, construct its
1491 -- actual subtype, as is done for subprogram formals. In this
1492 -- fashion, all its uses can refer to specific bounds.
1497 if (Is_Array_Type (T)
1498 and then not Is_Constrained (T))
1500 (Ekind (T) = E_Record_Type
1501 and then Has_Discriminants (T))
1504 Non_Freezing_Ref : constant Node_Id :=
1505 New_Reference_To (Id, Sloc (Id));
1509 -- Make sure that the actual subtype doesn't generate
1512 Set_Must_Not_Freeze (Non_Freezing_Ref);
1513 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1514 Insert_Before_And_Analyze (N, Decl);
1515 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1518 Set_Actual_Subtype (Id, T);
1523 ("initialization not allowed for `IN OUT` formals", N);
1527 end Analyze_Formal_Object_Declaration;
1529 ----------------------------------------------
1530 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1531 ----------------------------------------------
1533 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1537 Loc : constant Source_Ptr := Sloc (Def);
1538 Base : constant Entity_Id :=
1540 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1542 -- The semantic attributes are set for completeness only, their
1543 -- values will never be used, because all properties of the type
1547 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1548 Set_Etype (T, Base);
1549 Set_Size_Info (T, Standard_Integer);
1550 Set_RM_Size (T, RM_Size (Standard_Integer));
1551 Set_Small_Value (T, Ureal_1);
1552 Set_Delta_Value (T, Ureal_1);
1553 Set_Scalar_Range (T,
1555 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1556 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1558 Set_Is_Generic_Type (Base);
1559 Set_Etype (Base, Base);
1560 Set_Size_Info (Base, Standard_Integer);
1561 Set_RM_Size (Base, RM_Size (Standard_Integer));
1562 Set_Small_Value (Base, Ureal_1);
1563 Set_Delta_Value (Base, Ureal_1);
1564 Set_Scalar_Range (Base, Scalar_Range (T));
1565 Set_Parent (Base, Parent (Def));
1567 Check_Restriction (No_Fixed_Point, Def);
1568 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1570 ----------------------------
1571 -- Analyze_Formal_Package --
1572 ----------------------------
1574 procedure Analyze_Formal_Package (N : Node_Id) is
1575 Loc : constant Source_Ptr := Sloc (N);
1576 Formal : constant Entity_Id := Defining_Identifier (N);
1577 Gen_Id : constant Node_Id := Name (N);
1579 Gen_Unit : Entity_Id;
1581 Parent_Installed : Boolean := False;
1583 Parent_Instance : Entity_Id;
1584 Renaming_In_Par : Entity_Id;
1587 Text_IO_Kludge (Gen_Id);
1590 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1591 Gen_Unit := Entity (Gen_Id);
1593 if Ekind (Gen_Unit) /= E_Generic_Package then
1594 Error_Msg_N ("expect generic package name", Gen_Id);
1598 elsif Gen_Unit = Current_Scope then
1600 ("generic package cannot be used as a formal package of itself",
1606 -- Check for a formal package that is a package renaming.
1608 if Present (Renamed_Object (Gen_Unit)) then
1609 Gen_Unit := Renamed_Object (Gen_Unit);
1612 -- The formal package is treated like a regular instance, but only
1613 -- the specification needs to be instantiated, to make entities visible.
1615 if not Box_Present (N) then
1616 Hidden_Entities := New_Elmt_List;
1617 Analyze_Package_Instantiation (N);
1619 if Parent_Installed then
1624 -- If there are no generic associations, the generic parameters
1625 -- appear as local entities and are instantiated like them. We copy
1626 -- the generic package declaration as if it were an instantiation,
1627 -- and analyze it like a regular package, except that we treat the
1628 -- formals as additional visible components.
1630 Set_Instance_Env (Gen_Unit, Formal);
1632 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1634 if In_Extended_Main_Source_Unit (N) then
1635 Set_Is_Instantiated (Gen_Unit);
1636 Generate_Reference (Gen_Unit, N);
1641 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1642 Set_Defining_Unit_Name (Specification (New_N), Formal);
1645 Enter_Name (Formal);
1646 Set_Ekind (Formal, E_Generic_Package);
1647 Set_Etype (Formal, Standard_Void_Type);
1648 Set_Inner_Instances (Formal, New_Elmt_List);
1651 -- Within the formal, the name of the generic package is a renaming
1652 -- of the formal (as for a regular instantiation).
1654 Renaming := Make_Package_Renaming_Declaration (Loc,
1655 Defining_Unit_Name =>
1656 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1657 Name => New_Reference_To (Formal, Loc));
1659 if Present (Visible_Declarations (Specification (N))) then
1660 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1661 elsif Present (Private_Declarations (Specification (N))) then
1662 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1665 if Is_Child_Unit (Gen_Unit)
1666 and then Parent_Installed
1668 -- Similarly, we have to make the name of the formal visible in
1669 -- the parent instance, to resolve properly fully qualified names
1670 -- that may appear in the generic unit. The parent instance has
1671 -- been placed on the scope stack ahead of the current scope.
1673 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1676 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1677 Set_Ekind (Renaming_In_Par, E_Package);
1678 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1679 Set_Scope (Renaming_In_Par, Parent_Instance);
1680 Set_Parent (Renaming_In_Par, Parent (Formal));
1681 Set_Renamed_Object (Renaming_In_Par, Formal);
1682 Append_Entity (Renaming_In_Par, Parent_Instance);
1685 Analyze_Generic_Formal_Part (N);
1686 Analyze (Specification (N));
1687 End_Package_Scope (Formal);
1689 if Parent_Installed then
1695 -- Inside the generic unit, the formal package is a regular
1696 -- package, but no body is needed for it. Note that after
1697 -- instantiation, the defining_unit_name we need is in the
1698 -- new tree and not in the original. (see Package_Instantiation).
1699 -- A generic formal package is an instance, and can be used as
1700 -- an actual for an inner instance. Mark its generic parent.
1702 Set_Ekind (Formal, E_Package);
1703 Set_Generic_Parent (Specification (N), Gen_Unit);
1704 Set_Has_Completion (Formal, True);
1706 end Analyze_Formal_Package;
1708 ---------------------------------
1709 -- Analyze_Formal_Private_Type --
1710 ---------------------------------
1712 procedure Analyze_Formal_Private_Type
1718 New_Private_Type (N, T, Def);
1720 -- Set the size to an arbitrary but legal value.
1722 Set_Size_Info (T, Standard_Integer);
1723 Set_RM_Size (T, RM_Size (Standard_Integer));
1724 end Analyze_Formal_Private_Type;
1726 ----------------------------------------
1727 -- Analyze_Formal_Signed_Integer_Type --
1728 ----------------------------------------
1730 procedure Analyze_Formal_Signed_Integer_Type
1734 Base : constant Entity_Id :=
1736 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1741 Set_Ekind (T, E_Signed_Integer_Subtype);
1742 Set_Etype (T, Base);
1743 Set_Size_Info (T, Standard_Integer);
1744 Set_RM_Size (T, RM_Size (Standard_Integer));
1745 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1747 Set_Is_Generic_Type (Base);
1748 Set_Size_Info (Base, Standard_Integer);
1749 Set_RM_Size (Base, RM_Size (Standard_Integer));
1750 Set_Etype (Base, Base);
1751 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1752 Set_Parent (Base, Parent (Def));
1753 end Analyze_Formal_Signed_Integer_Type;
1755 -------------------------------
1756 -- Analyze_Formal_Subprogram --
1757 -------------------------------
1759 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1760 Spec : constant Node_Id := Specification (N);
1761 Def : constant Node_Id := Default_Name (N);
1762 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1770 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1771 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1775 Analyze_Subprogram_Declaration (N);
1776 Set_Is_Formal_Subprogram (Nam);
1777 Set_Has_Completion (Nam);
1779 -- Default name is resolved at the point of instantiation
1781 if Box_Present (N) then
1784 -- Else default is bound at the point of generic declaration
1786 elsif Present (Def) then
1787 if Nkind (Def) = N_Operator_Symbol then
1788 Find_Direct_Name (Def);
1790 elsif Nkind (Def) /= N_Attribute_Reference then
1794 -- For an attribute reference, analyze the prefix and verify
1795 -- that it has the proper profile for the subprogram.
1797 Analyze (Prefix (Def));
1798 Valid_Default_Attribute (Nam, Def);
1802 -- Default name may be overloaded, in which case the interpretation
1803 -- with the correct profile must be selected, as for a renaming.
1805 if Etype (Def) = Any_Type then
1808 elsif Nkind (Def) = N_Selected_Component then
1809 Subp := Entity (Selector_Name (Def));
1811 if Ekind (Subp) /= E_Entry then
1812 Error_Msg_N ("expect valid subprogram name as default", Def);
1816 elsif Nkind (Def) = N_Indexed_Component then
1818 if Nkind (Prefix (Def)) /= N_Selected_Component then
1819 Error_Msg_N ("expect valid subprogram name as default", Def);
1823 Subp := Entity (Selector_Name (Prefix (Def)));
1825 if Ekind (Subp) /= E_Entry_Family then
1826 Error_Msg_N ("expect valid subprogram name as default", Def);
1831 elsif Nkind (Def) = N_Character_Literal then
1833 -- Needs some type checks: subprogram should be parameterless???
1835 Resolve (Def, (Etype (Nam)));
1837 elsif not Is_Entity_Name (Def)
1838 or else not Is_Overloadable (Entity (Def))
1840 Error_Msg_N ("expect valid subprogram name as default", Def);
1843 elsif not Is_Overloaded (Def) then
1844 Subp := Entity (Def);
1847 Error_Msg_N ("premature usage of formal subprogram", Def);
1849 elsif not Entity_Matches_Spec (Subp, Nam) then
1850 Error_Msg_N ("no visible entity matches specification", Def);
1856 I1 : Interp_Index := 0;
1862 Get_First_Interp (Def, I, It);
1863 while Present (It.Nam) loop
1865 if Entity_Matches_Spec (It.Nam, Nam) then
1866 if Subp /= Any_Id then
1867 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1869 if It1 = No_Interp then
1870 Error_Msg_N ("ambiguous default subprogram", Def);
1883 Get_Next_Interp (I, It);
1887 if Subp /= Any_Id then
1888 Set_Entity (Def, Subp);
1891 Error_Msg_N ("premature usage of formal subprogram", Def);
1893 elsif Ekind (Subp) /= E_Operator then
1894 Check_Mode_Conformant (Subp, Nam);
1898 Error_Msg_N ("no visible subprogram matches specification", N);
1902 end Analyze_Formal_Subprogram;
1904 -------------------------------------
1905 -- Analyze_Formal_Type_Declaration --
1906 -------------------------------------
1908 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1909 Def : constant Node_Id := Formal_Type_Definition (N);
1913 T := Defining_Identifier (N);
1915 if Present (Discriminant_Specifications (N))
1916 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1919 ("discriminants not allowed for this formal type",
1920 Defining_Identifier (First (Discriminant_Specifications (N))));
1923 -- Enter the new name, and branch to specific routine.
1926 when N_Formal_Private_Type_Definition =>
1927 Analyze_Formal_Private_Type (N, T, Def);
1929 when N_Formal_Derived_Type_Definition =>
1930 Analyze_Formal_Derived_Type (N, T, Def);
1932 when N_Formal_Discrete_Type_Definition =>
1933 Analyze_Formal_Discrete_Type (T, Def);
1935 when N_Formal_Signed_Integer_Type_Definition =>
1936 Analyze_Formal_Signed_Integer_Type (T, Def);
1938 when N_Formal_Modular_Type_Definition =>
1939 Analyze_Formal_Modular_Type (T, Def);
1941 when N_Formal_Floating_Point_Definition =>
1942 Analyze_Formal_Floating_Type (T, Def);
1944 when N_Formal_Ordinary_Fixed_Point_Definition =>
1945 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1947 when N_Formal_Decimal_Fixed_Point_Definition =>
1948 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1950 when N_Array_Type_Definition =>
1951 Analyze_Formal_Array_Type (T, Def);
1953 when N_Access_To_Object_Definition |
1954 N_Access_Function_Definition |
1955 N_Access_Procedure_Definition =>
1956 Analyze_Generic_Access_Type (T, Def);
1962 raise Program_Error;
1966 Set_Is_Generic_Type (T);
1967 end Analyze_Formal_Type_Declaration;
1969 ------------------------------------
1970 -- Analyze_Function_Instantiation --
1971 ------------------------------------
1973 procedure Analyze_Function_Instantiation (N : Node_Id) is
1975 Analyze_Subprogram_Instantiation (N, E_Function);
1976 end Analyze_Function_Instantiation;
1978 ---------------------------------
1979 -- Analyze_Generic_Access_Type --
1980 ---------------------------------
1982 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1986 if Nkind (Def) = N_Access_To_Object_Definition then
1987 Access_Type_Declaration (T, Def);
1989 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1990 and then No (Full_View (Designated_Type (T)))
1991 and then not Is_Generic_Type (Designated_Type (T))
1993 Error_Msg_N ("premature usage of incomplete type", Def);
1995 elsif Is_Internal (Designated_Type (T)) then
1997 ("only a subtype mark is allowed in a formal", Def);
2001 Access_Subprogram_Declaration (T, Def);
2003 end Analyze_Generic_Access_Type;
2005 ---------------------------------
2006 -- Analyze_Generic_Formal_Part --
2007 ---------------------------------
2009 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2010 Gen_Parm_Decl : Node_Id;
2013 -- The generic formals are processed in the scope of the generic
2014 -- unit, where they are immediately visible. The scope is installed
2017 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2019 while Present (Gen_Parm_Decl) loop
2020 Analyze (Gen_Parm_Decl);
2021 Next (Gen_Parm_Decl);
2024 Generate_Reference_To_Generic_Formals (Current_Scope);
2025 end Analyze_Generic_Formal_Part;
2027 ------------------------------------------
2028 -- Analyze_Generic_Package_Declaration --
2029 ------------------------------------------
2031 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2032 Loc : constant Source_Ptr := Sloc (N);
2035 Save_Parent : Node_Id;
2037 Decls : constant List_Id :=
2038 Visible_Declarations (Specification (N));
2042 -- We introduce a renaming of the enclosing package, to have a usable
2043 -- entity as the prefix of an expanded name for a local entity of the
2044 -- form Par.P.Q, where P is the generic package. This is because a local
2045 -- entity named P may hide it, so that the usual visibility rules in
2046 -- the instance will not resolve properly.
2049 Make_Package_Renaming_Declaration (Loc,
2050 Defining_Unit_Name =>
2051 Make_Defining_Identifier (Loc,
2052 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2053 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2055 if Present (Decls) then
2056 Decl := First (Decls);
2057 while Present (Decl)
2058 and then Nkind (Decl) = N_Pragma
2063 if Present (Decl) then
2064 Insert_Before (Decl, Renaming);
2066 Append (Renaming, Visible_Declarations (Specification (N)));
2070 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2073 -- Create copy of generic unit, and save for instantiation.
2074 -- If the unit is a child unit, do not copy the specifications
2075 -- for the parent, which are not part of the generic tree.
2077 Save_Parent := Parent_Spec (N);
2078 Set_Parent_Spec (N, Empty);
2080 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2081 Set_Parent_Spec (New_N, Save_Parent);
2083 Id := Defining_Entity (N);
2084 Generate_Definition (Id);
2086 -- Expansion is not applied to generic units.
2091 Set_Ekind (Id, E_Generic_Package);
2092 Set_Etype (Id, Standard_Void_Type);
2094 Enter_Generic_Scope (Id);
2095 Set_Inner_Instances (Id, New_Elmt_List);
2097 Set_Categorization_From_Pragmas (N);
2098 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2100 -- Link the declaration of the generic homonym in the generic copy
2101 -- to the package it renames, so that it is always resolved properly.
2103 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2104 Set_Entity (Associated_Node (Name (Renaming)), Id);
2106 -- For a library unit, we have reconstructed the entity for the
2107 -- unit, and must reset it in the library tables.
2109 if Nkind (Parent (N)) = N_Compilation_Unit then
2110 Set_Cunit_Entity (Current_Sem_Unit, Id);
2113 Analyze_Generic_Formal_Part (N);
2115 -- After processing the generic formals, analysis proceeds
2116 -- as for a non-generic package.
2118 Analyze (Specification (N));
2120 Validate_Categorization_Dependency (N, Id);
2124 End_Package_Scope (Id);
2125 Exit_Generic_Scope (Id);
2127 if Nkind (Parent (N)) /= N_Compilation_Unit then
2128 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2129 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2130 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2133 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2134 Validate_RT_RAT_Component (N);
2136 -- If this is a spec without a body, check that generic parameters
2139 if not Body_Required (Parent (N)) then
2140 Check_References (Id);
2143 end Analyze_Generic_Package_Declaration;
2145 --------------------------------------------
2146 -- Analyze_Generic_Subprogram_Declaration --
2147 --------------------------------------------
2149 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2154 Save_Parent : Node_Id;
2157 -- Create copy of generic unit,and save for instantiation.
2158 -- If the unit is a child unit, do not copy the specifications
2159 -- for the parent, which are not part of the generic tree.
2161 Save_Parent := Parent_Spec (N);
2162 Set_Parent_Spec (N, Empty);
2164 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2165 Set_Parent_Spec (New_N, Save_Parent);
2168 Spec := Specification (N);
2169 Id := Defining_Entity (Spec);
2170 Generate_Definition (Id);
2172 if Nkind (Id) = N_Defining_Operator_Symbol then
2174 ("operator symbol not allowed for generic subprogram", Id);
2181 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2183 Enter_Generic_Scope (Id);
2184 Set_Inner_Instances (Id, New_Elmt_List);
2185 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2187 Analyze_Generic_Formal_Part (N);
2189 Formals := Parameter_Specifications (Spec);
2191 if Present (Formals) then
2192 Process_Formals (Formals, Spec);
2195 if Nkind (Spec) = N_Function_Specification then
2196 Set_Ekind (Id, E_Generic_Function);
2197 Find_Type (Subtype_Mark (Spec));
2198 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2200 Set_Ekind (Id, E_Generic_Procedure);
2201 Set_Etype (Id, Standard_Void_Type);
2204 -- For a library unit, we have reconstructed the entity for the
2205 -- unit, and must reset it in the library tables. We also need
2206 -- to make sure that Body_Required is set properly in the original
2207 -- compilation unit node.
2209 if Nkind (Parent (N)) = N_Compilation_Unit then
2210 Set_Cunit_Entity (Current_Sem_Unit, Id);
2211 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2214 Set_Categorization_From_Pragmas (N);
2215 Validate_Categorization_Dependency (N, Id);
2217 Save_Global_References (Original_Node (N));
2221 Exit_Generic_Scope (Id);
2222 Generate_Reference_To_Formals (Id);
2223 end Analyze_Generic_Subprogram_Declaration;
2225 -----------------------------------
2226 -- Analyze_Package_Instantiation --
2227 -----------------------------------
2229 -- Note: this procedure is also used for formal package declarations,
2230 -- in which case the argument N is an N_Formal_Package_Declaration
2231 -- node. This should really be noted in the spec! ???
2233 procedure Analyze_Package_Instantiation (N : Node_Id) is
2234 Loc : constant Source_Ptr := Sloc (N);
2235 Gen_Id : constant Node_Id := Name (N);
2238 Act_Decl_Name : Node_Id;
2239 Act_Decl_Id : Entity_Id;
2244 Gen_Unit : Entity_Id;
2246 Is_Actual_Pack : constant Boolean :=
2247 Is_Internal (Defining_Entity (N));
2249 Parent_Installed : Boolean := False;
2250 Renaming_List : List_Id;
2251 Unit_Renaming : Node_Id;
2252 Needs_Body : Boolean;
2253 Inline_Now : Boolean := False;
2255 procedure Delay_Descriptors (E : Entity_Id);
2256 -- Delay generation of subprogram descriptors for given entity
2258 function Might_Inline_Subp return Boolean;
2259 -- If inlining is active and the generic contains inlined subprograms,
2260 -- we instantiate the body. This may cause superfluous instantiations,
2261 -- but it is simpler than detecting the need for the body at the point
2262 -- of inlining, when the context of the instance is not available.
2264 -----------------------
2265 -- Delay_Descriptors --
2266 -----------------------
2268 procedure Delay_Descriptors (E : Entity_Id) is
2270 if not Delay_Subprogram_Descriptors (E) then
2271 Set_Delay_Subprogram_Descriptors (E);
2272 Pending_Descriptor.Increment_Last;
2273 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2275 end Delay_Descriptors;
2277 -----------------------
2278 -- Might_Inline_Subp --
2279 -----------------------
2281 function Might_Inline_Subp return Boolean is
2285 if not Inline_Processing_Required then
2289 E := First_Entity (Gen_Unit);
2291 while Present (E) loop
2293 if Is_Subprogram (E)
2294 and then Is_Inlined (E)
2304 end Might_Inline_Subp;
2306 -- Start of processing for Analyze_Package_Instantiation
2309 -- Very first thing: apply the special kludge for Text_IO processing
2310 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2312 Text_IO_Kludge (Name (N));
2314 -- Make node global for error reporting.
2316 Instantiation_Node := N;
2318 -- Case of instantiation of a generic package
2320 if Nkind (N) = N_Package_Instantiation then
2321 Act_Decl_Id := New_Copy (Defining_Entity (N));
2322 Set_Comes_From_Source (Act_Decl_Id, True);
2324 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2326 Make_Defining_Program_Unit_Name (Loc,
2327 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2328 Defining_Identifier => Act_Decl_Id);
2330 Act_Decl_Name := Act_Decl_Id;
2333 -- Case of instantiation of a formal package
2336 Act_Decl_Id := Defining_Identifier (N);
2337 Act_Decl_Name := Act_Decl_Id;
2340 Generate_Definition (Act_Decl_Id);
2341 Pre_Analyze_Actuals (N);
2344 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2345 Gen_Unit := Entity (Gen_Id);
2347 -- Verify that it is the name of a generic package
2349 if Etype (Gen_Unit) = Any_Type then
2353 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2355 -- Ada0Y (AI-50217): Instance can not be used in limited with_clause
2357 if From_With_Type (Gen_Unit) then
2359 ("cannot instantiate a limited withed package", Gen_Id);
2362 ("expect name of generic package in instantiation", Gen_Id);
2369 if In_Extended_Main_Source_Unit (N) then
2370 Set_Is_Instantiated (Gen_Unit);
2371 Generate_Reference (Gen_Unit, N);
2373 if Present (Renamed_Object (Gen_Unit)) then
2374 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2375 Generate_Reference (Renamed_Object (Gen_Unit), N);
2379 if Nkind (Gen_Id) = N_Identifier
2380 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2383 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2385 elsif Nkind (Gen_Id) = N_Expanded_Name
2386 and then Is_Child_Unit (Gen_Unit)
2387 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2388 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2391 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2394 Set_Entity (Gen_Id, Gen_Unit);
2396 -- If generic is a renaming, get original generic unit.
2398 if Present (Renamed_Object (Gen_Unit))
2399 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2401 Gen_Unit := Renamed_Object (Gen_Unit);
2404 -- Verify that there are no circular instantiations.
2406 if In_Open_Scopes (Gen_Unit) then
2407 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2411 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2412 Error_Msg_Node_2 := Current_Scope;
2414 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2415 Circularity_Detected := True;
2420 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
2421 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2423 -- Initialize renamings map, for error checking, and the list
2424 -- that holds private entities whose views have changed between
2425 -- generic definition and instantiation. If this is the instance
2426 -- created to validate an actual package, the instantiation
2427 -- environment is that of the enclosing instance.
2429 Generic_Renamings.Set_Last (0);
2430 Generic_Renamings_HTable.Reset;
2432 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2434 -- Copy original generic tree, to produce text for instantiation.
2438 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2440 Act_Spec := Specification (Act_Tree);
2442 -- If this is the instance created to validate an actual package,
2443 -- only the formals matter, do not examine the package spec itself.
2445 if Is_Actual_Pack then
2446 Set_Visible_Declarations (Act_Spec, New_List);
2447 Set_Private_Declarations (Act_Spec, New_List);
2451 Analyze_Associations
2453 Generic_Formal_Declarations (Act_Tree),
2454 Generic_Formal_Declarations (Gen_Decl));
2456 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2457 Set_Is_Generic_Instance (Act_Decl_Id);
2459 Set_Generic_Parent (Act_Spec, Gen_Unit);
2461 -- References to the generic in its own declaration or its body
2462 -- are references to the instance. Add a renaming declaration for
2463 -- the generic unit itself. This declaration, as well as the renaming
2464 -- declarations for the generic formals, must remain private to the
2465 -- unit: the formals, because this is the language semantics, and
2466 -- the unit because its use is an artifact of the implementation.
2469 Make_Package_Renaming_Declaration (Loc,
2470 Defining_Unit_Name =>
2471 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2472 Name => New_Reference_To (Act_Decl_Id, Loc));
2474 Append (Unit_Renaming, Renaming_List);
2476 -- The renaming declarations are the first local declarations of
2479 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2481 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2483 Set_Visible_Declarations (Act_Spec, Renaming_List);
2487 Make_Package_Declaration (Loc,
2488 Specification => Act_Spec);
2490 -- Save the instantiation node, for subsequent instantiation
2491 -- of the body, if there is one and we are generating code for
2492 -- the current unit. Mark the unit as having a body, to avoid
2493 -- a premature error message.
2495 -- We instantiate the body if we are generating code, if we are
2496 -- generating cross-reference information, or if we are building
2497 -- trees for ASIS use.
2500 Enclosing_Body_Present : Boolean := False;
2501 -- If the generic unit is not a compilation unit, then a body
2502 -- may be present in its parent even if none is required. We
2503 -- create a tentative pending instantiation for the body, which
2504 -- will be discarded if none is actually present.
2509 if Scope (Gen_Unit) /= Standard_Standard
2510 and then not Is_Child_Unit (Gen_Unit)
2512 Scop := Scope (Gen_Unit);
2514 while Present (Scop)
2515 and then Scop /= Standard_Standard
2517 if Unit_Requires_Body (Scop) then
2518 Enclosing_Body_Present := True;
2522 exit when Is_Compilation_Unit (Scop);
2523 Scop := Scope (Scop);
2527 -- If front-end inlining is enabled, and this is a unit for which
2528 -- code will be generated, we instantiate the body at once.
2529 -- This is done if the instance is not the main unit, and if the
2530 -- generic is not a child unit of another generic, to avoid scope
2531 -- problems and the reinstallation of parent instances.
2533 if Front_End_Inlining
2534 and then Expander_Active
2535 and then (not Is_Child_Unit (Gen_Unit)
2536 or else not Is_Generic_Unit (Scope (Gen_Unit)))
2537 and then Is_In_Main_Unit (N)
2538 and then Nkind (Parent (N)) /= N_Compilation_Unit
2539 and then Might_Inline_Subp
2540 and then not Is_Actual_Pack
2546 (Unit_Requires_Body (Gen_Unit)
2547 or else Enclosing_Body_Present
2548 or else Present (Corresponding_Body (Gen_Decl)))
2549 and then (Is_In_Main_Unit (N)
2550 or else Might_Inline_Subp)
2551 and then not Is_Actual_Pack
2552 and then not Inline_Now
2554 and then (Operating_Mode = Generate_Code
2555 or else (Operating_Mode = Check_Semantics
2556 and then ASIS_Mode));
2558 -- If front_end_inlining is enabled, do not instantiate a
2559 -- body if within a generic context.
2561 if Front_End_Inlining
2562 and then not Expander_Active
2564 Needs_Body := False;
2567 -- If the current context is generic, and the package being
2568 -- instantiated is declared within a formal package, there
2569 -- is no body to instantiate until the enclosing generic is
2570 -- instantiated, and there is an actual for the formal
2571 -- package. If the formal package has parameters, we build a
2572 -- regular package instance for it, that preceeds the original
2573 -- formal package declaration.
2575 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
2579 (Unit_Declaration_Node (Scope (Gen_Unit)));
2581 if Nkind (Decl) = N_Formal_Package_Declaration
2582 or else (Nkind (Decl) = N_Package_Declaration
2583 and then Is_List_Member (Decl)
2584 and then Present (Next (Decl))
2586 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
2588 Needs_Body := False;
2594 -- If we are generating the calling stubs from the instantiation
2595 -- of a generic RCI package, we will not use the body of the
2598 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2599 and then Is_Compilation_Unit (Defining_Entity (N))
2601 Needs_Body := False;
2606 -- Here is a defence against a ludicrous number of instantiations
2607 -- caused by a circular set of instantiation attempts.
2609 if Pending_Instantiations.Last >
2610 Hostparm.Max_Instantiations
2612 Error_Msg_N ("too many instantiations", N);
2613 raise Unrecoverable_Error;
2616 -- Indicate that the enclosing scopes contain an instantiation,
2617 -- and that cleanup actions should be delayed until after the
2618 -- instance body is expanded.
2620 Check_Forward_Instantiation (Gen_Decl);
2621 if Nkind (N) = N_Package_Instantiation then
2623 Enclosing_Master : Entity_Id := Current_Scope;
2626 while Enclosing_Master /= Standard_Standard loop
2628 if Ekind (Enclosing_Master) = E_Package then
2629 if Is_Compilation_Unit (Enclosing_Master) then
2630 if In_Package_Body (Enclosing_Master) then
2632 (Body_Entity (Enclosing_Master));
2641 Enclosing_Master := Scope (Enclosing_Master);
2644 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2645 Enclosing_Master := Scope (Enclosing_Master);
2647 elsif Is_Generic_Subprogram (Enclosing_Master)
2648 or else Ekind (Enclosing_Master) = E_Void
2650 -- Cleanup actions will eventually be performed on
2651 -- the enclosing instance, if any. enclosing scope
2652 -- is void in the formal part of a generic subp.
2657 if Ekind (Enclosing_Master) = E_Entry
2659 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2662 Protected_Body_Subprogram (Enclosing_Master);
2665 Set_Delay_Cleanups (Enclosing_Master);
2667 while Ekind (Enclosing_Master) = E_Block loop
2668 Enclosing_Master := Scope (Enclosing_Master);
2671 if Is_Subprogram (Enclosing_Master) then
2672 Delay_Descriptors (Enclosing_Master);
2674 elsif Is_Task_Type (Enclosing_Master) then
2676 TBP : constant Node_Id :=
2677 Get_Task_Body_Procedure
2681 if Present (TBP) then
2682 Delay_Descriptors (TBP);
2683 Set_Delay_Cleanups (TBP);
2693 -- Make entry in table
2695 Pending_Instantiations.Increment_Last;
2696 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2697 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2701 Set_Categorization_From_Pragmas (Act_Decl);
2703 if Parent_Installed then
2707 Set_Instance_Spec (N, Act_Decl);
2709 -- If not a compilation unit, insert the package declaration
2710 -- before the original instantiation node.
2712 if Nkind (Parent (N)) /= N_Compilation_Unit then
2713 Mark_Rewrite_Insertion (Act_Decl);
2714 Insert_Before (N, Act_Decl);
2717 -- For an instantiation that is a compilation unit, place
2718 -- declaration on current node so context is complete
2719 -- for analysis (including nested instantiations). It this
2720 -- is the main unit, the declaration eventually replaces the
2721 -- instantiation node. If the instance body is later created, it
2722 -- replaces the instance node, and the declation is attached to
2723 -- it (see Build_Instance_Compilation_Unit_Nodes).
2726 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2728 -- The entity for the current unit is the newly created one,
2729 -- and all semantic information is attached to it.
2731 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2733 -- If this is the main unit, replace the main entity as well.
2735 if Current_Sem_Unit = Main_Unit then
2736 Main_Unit_Entity := Act_Decl_Id;
2740 Set_Unit (Parent (N), Act_Decl);
2741 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2743 Set_Unit (Parent (N), N);
2744 Set_Body_Required (Parent (N), False);
2746 -- We never need elaboration checks on instantiations, since
2747 -- by definition, the body instantiation is elaborated at the
2748 -- same time as the spec instantiation.
2750 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2751 Set_Kill_Elaboration_Checks (Act_Decl_Id);
2754 Check_Elab_Instantiation (N);
2756 if ABE_Is_Certain (N) and then Needs_Body then
2757 Pending_Instantiations.Decrement_Last;
2759 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2761 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2762 First_Private_Entity (Act_Decl_Id));
2764 -- If the instantiation will receive a body, the unit will
2765 -- be transformed into a package body, and receive its own
2766 -- elaboration entity. Otherwise, the nature of the unit is
2767 -- now a package declaration.
2769 if Nkind (Parent (N)) = N_Compilation_Unit
2770 and then not Needs_Body
2772 Rewrite (N, Act_Decl);
2775 if Present (Corresponding_Body (Gen_Decl))
2776 or else Unit_Requires_Body (Gen_Unit)
2778 Set_Has_Completion (Act_Decl_Id);
2781 Check_Formal_Packages (Act_Decl_Id);
2783 Restore_Private_Views (Act_Decl_Id);
2785 if not Generic_Separately_Compiled (Gen_Unit) then
2786 Inherit_Context (Gen_Decl, N);
2789 if Parent_Installed then
2796 Validate_Categorization_Dependency (N, Act_Decl_Id);
2798 -- Check restriction, but skip this if something went wrong in
2799 -- the above analysis, indicated by Act_Decl_Id being void.
2801 if Ekind (Act_Decl_Id) /= E_Void
2802 and then not Is_Library_Level_Entity (Act_Decl_Id)
2804 Check_Restriction (No_Local_Allocators, N);
2808 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2812 when Instantiation_Error =>
2813 if Parent_Installed then
2816 end Analyze_Package_Instantiation;
2818 ---------------------------
2819 -- Inline_Instance_Body --
2820 ---------------------------
2822 procedure Inline_Instance_Body
2824 Gen_Unit : Entity_Id;
2828 Gen_Comp : constant Entity_Id :=
2829 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2830 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2831 Curr_Scope : Entity_Id := Empty;
2832 Curr_Unit : constant Entity_Id :=
2833 Cunit_Entity (Current_Sem_Unit);
2834 Removed : Boolean := False;
2835 Num_Scopes : Int := 0;
2836 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2837 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2838 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2839 Num_Inner : Int := 0;
2840 N_Instances : Int := 0;
2844 -- Case of generic unit defined in another unit. We must remove
2845 -- the complete context of the current unit to install that of
2848 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2852 and then S /= Standard_Standard
2854 Num_Scopes := Num_Scopes + 1;
2856 Use_Clauses (Num_Scopes) :=
2858 (Scope_Stack.Last - Num_Scopes + 1).
2860 End_Use_Clauses (Use_Clauses (Num_Scopes));
2862 exit when Is_Generic_Instance (S)
2863 and then (In_Package_Body (S)
2864 or else Ekind (S) = E_Procedure
2865 or else Ekind (S) = E_Function);
2869 Vis := Is_Immediately_Visible (Gen_Comp);
2871 -- Find and save all enclosing instances
2876 and then S /= Standard_Standard
2878 if Is_Generic_Instance (S) then
2879 N_Instances := N_Instances + 1;
2880 Instances (N_Instances) := S;
2882 exit when In_Package_Body (S);
2888 -- Remove context of current compilation unit, unless we
2889 -- are within a nested package instantiation, in which case
2890 -- the context has been removed previously.
2892 -- If current scope is the body of a child unit, remove context
2898 and then S /= Standard_Standard
2900 exit when Is_Generic_Instance (S)
2901 and then (In_Package_Body (S)
2902 or else Ekind (S) = E_Procedure
2903 or else Ekind (S) = E_Function);
2906 or else (Ekind (Curr_Unit) = E_Package_Body
2907 and then S = Spec_Entity (Curr_Unit))
2908 or else (Ekind (Curr_Unit) = E_Subprogram_Body
2911 (Unit_Declaration_Node (Curr_Unit)))
2915 -- Remove entities in current scopes from visibility, so
2916 -- than instance body is compiled in a clean environment.
2918 Save_Scope_Stack (Handle_Use => False);
2920 if Is_Child_Unit (S) then
2922 -- Remove child unit from stack, as well as inner scopes.
2923 -- Removing the context of a child unit removes parent
2926 while Current_Scope /= S loop
2927 Num_Inner := Num_Inner + 1;
2928 Inner_Scopes (Num_Inner) := Current_Scope;
2933 Remove_Context (Curr_Comp);
2937 Remove_Context (Curr_Comp);
2940 if Ekind (Curr_Unit) = E_Package_Body then
2941 Remove_Context (Library_Unit (Curr_Comp));
2948 New_Scope (Standard_Standard);
2949 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
2950 Instantiate_Package_Body
2951 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
2956 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2958 -- Reset Generic_Instance flag so that use clauses can be installed
2959 -- in the proper order. (See Use_One_Package for effect of enclosing
2960 -- instances on processing of use clauses).
2962 for J in 1 .. N_Instances loop
2963 Set_Is_Generic_Instance (Instances (J), False);
2967 Install_Context (Curr_Comp);
2969 if Present (Curr_Scope)
2970 and then Is_Child_Unit (Curr_Scope)
2972 New_Scope (Curr_Scope);
2973 Set_Is_Immediately_Visible (Curr_Scope);
2975 -- Finally, restore inner scopes as well.
2977 for J in reverse 1 .. Num_Inner loop
2978 New_Scope (Inner_Scopes (J));
2982 Restore_Scope_Stack (Handle_Use => False);
2985 -- Restore use clauses. For a child unit, use clauses in the
2986 -- parents are restored when installing the context, so only
2987 -- those in inner scopes (and those local to the child unit itself)
2988 -- need to be installed explicitly.
2990 if Is_Child_Unit (Curr_Unit)
2993 for J in reverse 1 .. Num_Inner + 1 loop
2994 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
2996 Install_Use_Clauses (Use_Clauses (J));
3000 for J in reverse 1 .. Num_Scopes loop
3001 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3003 Install_Use_Clauses (Use_Clauses (J));
3007 for J in 1 .. N_Instances loop
3008 Set_Is_Generic_Instance (Instances (J), True);
3011 -- If generic unit is in current unit, current context is correct.
3014 Instantiate_Package_Body
3015 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3017 end Inline_Instance_Body;
3019 -------------------------------------
3020 -- Analyze_Procedure_Instantiation --
3021 -------------------------------------
3023 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3025 Analyze_Subprogram_Instantiation (N, E_Procedure);
3026 end Analyze_Procedure_Instantiation;
3028 --------------------------------------
3029 -- Analyze_Subprogram_Instantiation --
3030 --------------------------------------
3032 procedure Analyze_Subprogram_Instantiation
3036 Loc : constant Source_Ptr := Sloc (N);
3037 Gen_Id : constant Node_Id := Name (N);
3039 Anon_Id : constant Entity_Id :=
3040 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3041 Chars => New_External_Name
3042 (Chars (Defining_Entity (N)), 'R'));
3044 Act_Decl_Id : Entity_Id;
3049 Gen_Unit : Entity_Id;
3051 Pack_Id : Entity_Id;
3052 Parent_Installed : Boolean := False;
3053 Renaming_List : List_Id;
3055 procedure Analyze_Instance_And_Renamings;
3056 -- The instance must be analyzed in a context that includes the
3057 -- mappings of generic parameters into actuals. We create a package
3058 -- declaration for this purpose, and a subprogram with an internal
3059 -- name within the package. The subprogram instance is simply an
3060 -- alias for the internal subprogram, declared in the current scope.
3062 ------------------------------------
3063 -- Analyze_Instance_And_Renamings --
3064 ------------------------------------
3066 procedure Analyze_Instance_And_Renamings is
3067 Def_Ent : constant Entity_Id := Defining_Entity (N);
3068 Pack_Decl : Node_Id;
3071 if Nkind (Parent (N)) = N_Compilation_Unit then
3073 -- For the case of a compilation unit, the container package
3074 -- has the same name as the instantiation, to insure that the
3075 -- binder calls the elaboration procedure with the right name.
3076 -- Copy the entity of the instance, which may have compilation
3077 -- level flags (e.g. Is_Child_Unit) set.
3079 Pack_Id := New_Copy (Def_Ent);
3082 -- Otherwise we use the name of the instantiation concatenated
3083 -- with its source position to ensure uniqueness if there are
3084 -- several instantiations with the same name.
3087 Make_Defining_Identifier (Loc,
3088 Chars => New_External_Name
3089 (Related_Id => Chars (Def_Ent),
3091 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3094 Pack_Decl := Make_Package_Declaration (Loc,
3095 Specification => Make_Package_Specification (Loc,
3096 Defining_Unit_Name => Pack_Id,
3097 Visible_Declarations => Renaming_List,
3098 End_Label => Empty));
3100 Set_Instance_Spec (N, Pack_Decl);
3101 Set_Is_Generic_Instance (Pack_Id);
3102 Set_Needs_Debug_Info (Pack_Id);
3104 -- Case of not a compilation unit
3106 if Nkind (Parent (N)) /= N_Compilation_Unit then
3107 Mark_Rewrite_Insertion (Pack_Decl);
3108 Insert_Before (N, Pack_Decl);
3109 Set_Has_Completion (Pack_Id);
3111 -- Case of an instantiation that is a compilation unit
3113 -- Place declaration on current node so context is complete
3114 -- for analysis (including nested instantiations), and for
3115 -- use in a context_clause (see Analyze_With_Clause).
3118 Set_Unit (Parent (N), Pack_Decl);
3119 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3122 Analyze (Pack_Decl);
3123 Check_Formal_Packages (Pack_Id);
3124 Set_Is_Generic_Instance (Pack_Id, False);
3126 -- Body of the enclosing package is supplied when instantiating
3127 -- the subprogram body, after semantic analysis is completed.
3129 if Nkind (Parent (N)) = N_Compilation_Unit then
3131 -- Remove package itself from visibility, so it does not
3132 -- conflict with subprogram.
3134 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3136 -- Set name and scope of internal subprogram so that the
3137 -- proper external name will be generated. The proper scope
3138 -- is the scope of the wrapper package. We need to generate
3139 -- debugging information for the internal subprogram, so set
3140 -- flag accordingly.
3142 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3143 Set_Scope (Anon_Id, Scope (Pack_Id));
3145 -- Mark wrapper package as referenced, to avoid spurious
3146 -- warnings if the instantiation appears in various with_
3147 -- clauses of subunits of the main unit.
3149 Set_Referenced (Pack_Id);
3152 Set_Is_Generic_Instance (Anon_Id);
3153 Set_Needs_Debug_Info (Anon_Id);
3154 Act_Decl_Id := New_Copy (Anon_Id);
3156 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3157 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3158 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3159 Set_Comes_From_Source (Act_Decl_Id, True);
3161 -- The signature may involve types that are not frozen yet, but
3162 -- the subprogram will be frozen at the point the wrapper package
3163 -- is frozen, so it does not need its own freeze node. In fact, if
3164 -- one is created, it might conflict with the freezing actions from
3165 -- the wrapper package (see 7206-013).
3167 Set_Has_Delayed_Freeze (Anon_Id, False);
3169 -- If the instance is a child unit, mark the Id accordingly. Mark
3170 -- the anonymous entity as well, which is the real subprogram and
3171 -- which is used when the instance appears in a context clause.
3173 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3174 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3175 New_Overloaded_Entity (Act_Decl_Id);
3176 Check_Eliminated (Act_Decl_Id);
3178 -- In compilation unit case, kill elaboration checks on the
3179 -- instantiation, since they are never needed -- the body is
3180 -- instantiated at the same point as the spec.
3182 if Nkind (Parent (N)) = N_Compilation_Unit then
3183 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3184 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3185 Set_Is_Compilation_Unit (Anon_Id);
3187 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3190 -- The instance is not a freezing point for the new subprogram.
3192 Set_Is_Frozen (Act_Decl_Id, False);
3194 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3195 Valid_Operator_Definition (Act_Decl_Id);
3198 Set_Alias (Act_Decl_Id, Anon_Id);
3199 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3200 Set_Has_Completion (Act_Decl_Id);
3201 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3203 if Nkind (Parent (N)) = N_Compilation_Unit then
3204 Set_Body_Required (Parent (N), False);
3207 end Analyze_Instance_And_Renamings;
3209 -- Start of processing for Analyze_Subprogram_Instantiation
3212 -- Very first thing: apply the special kludge for Text_IO processing
3213 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3214 -- Of course such an instantiation is bogus (these are packages, not
3215 -- subprograms), but we get a better error message if we do this.
3217 Text_IO_Kludge (Gen_Id);
3219 -- Make node global for error reporting.
3221 Instantiation_Node := N;
3222 Pre_Analyze_Actuals (N);
3225 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3226 Gen_Unit := Entity (Gen_Id);
3228 Generate_Reference (Gen_Unit, Gen_Id);
3230 if Nkind (Gen_Id) = N_Identifier
3231 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3234 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3237 if Etype (Gen_Unit) = Any_Type then
3242 -- Verify that it is a generic subprogram of the right kind, and that
3243 -- it does not lead to a circular instantiation.
3245 if Ekind (Gen_Unit) /= E_Generic_Procedure
3246 and then Ekind (Gen_Unit) /= E_Generic_Function
3248 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3250 elsif In_Open_Scopes (Gen_Unit) then
3251 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3253 elsif K = E_Procedure
3254 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3256 if Ekind (Gen_Unit) = E_Generic_Function then
3258 ("cannot instantiate generic function as procedure", Gen_Id);
3261 ("expect name of generic procedure in instantiation", Gen_Id);
3264 elsif K = E_Function
3265 and then Ekind (Gen_Unit) /= E_Generic_Function
3267 if Ekind (Gen_Unit) = E_Generic_Procedure then
3269 ("cannot instantiate generic procedure as function", Gen_Id);
3272 ("expect name of generic function in instantiation", Gen_Id);
3276 Set_Entity (Gen_Id, Gen_Unit);
3277 Set_Is_Instantiated (Gen_Unit);
3279 if In_Extended_Main_Source_Unit (N) then
3280 Generate_Reference (Gen_Unit, N);
3283 -- If renaming, get original unit
3285 if Present (Renamed_Object (Gen_Unit))
3286 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3288 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3290 Gen_Unit := Renamed_Object (Gen_Unit);
3291 Set_Is_Instantiated (Gen_Unit);
3292 Generate_Reference (Gen_Unit, N);
3295 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3296 Error_Msg_Node_2 := Current_Scope;
3298 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3299 Circularity_Detected := True;
3303 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3305 -- The subprogram itself cannot contain a nested instance, so
3306 -- the current parent is left empty.
3308 Set_Instance_Env (Gen_Unit, Empty);
3310 -- Initialize renamings map, for error checking.
3312 Generic_Renamings.Set_Last (0);
3313 Generic_Renamings_HTable.Reset;
3315 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3317 -- Copy original generic tree, to produce text for instantiation.
3321 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3323 Act_Spec := Specification (Act_Tree);
3325 Analyze_Associations
3327 Generic_Formal_Declarations (Act_Tree),
3328 Generic_Formal_Declarations (Gen_Decl));
3330 -- Build the subprogram declaration, which does not appear
3331 -- in the generic template, and give it a sloc consistent
3332 -- with that of the template.
3334 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3335 Set_Generic_Parent (Act_Spec, Gen_Unit);
3337 Make_Subprogram_Declaration (Sloc (Act_Spec),
3338 Specification => Act_Spec);
3340 Set_Categorization_From_Pragmas (Act_Decl);
3342 if Parent_Installed then
3346 Append (Act_Decl, Renaming_List);
3347 Analyze_Instance_And_Renamings;
3349 -- If the generic is marked Import (Intrinsic), then so is the
3350 -- instance. This indicates that there is no body to instantiate.
3351 -- If generic is marked inline, so it the instance, and the
3352 -- anonymous subprogram it renames. If inlined, or else if inlining
3353 -- is enabled for the compilation, we generate the instance body
3354 -- even if it is not within the main unit.
3356 -- Any other pragmas might also be inherited ???
3358 if Is_Intrinsic_Subprogram (Gen_Unit) then
3359 Set_Is_Intrinsic_Subprogram (Anon_Id);
3360 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3362 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3363 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3367 Generate_Definition (Act_Decl_Id);
3369 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3370 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3372 if not Is_Intrinsic_Subprogram (Gen_Unit) then
3373 Check_Elab_Instantiation (N);
3376 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3378 -- Subject to change, pending on if other pragmas are inherited ???
3380 Validate_Categorization_Dependency (N, Act_Decl_Id);
3382 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3384 if not Generic_Separately_Compiled (Gen_Unit) then
3385 Inherit_Context (Gen_Decl, N);
3388 Restore_Private_Views (Pack_Id, False);
3390 -- If the context requires a full instantiation, mark node for
3391 -- subsequent construction of the body.
3393 if (Is_In_Main_Unit (N)
3394 or else Is_Inlined (Act_Decl_Id))
3395 and then (Operating_Mode = Generate_Code
3396 or else (Operating_Mode = Check_Semantics
3397 and then ASIS_Mode))
3398 and then (Expander_Active or else ASIS_Mode)
3399 and then not ABE_Is_Certain (N)
3400 and then not Is_Eliminated (Act_Decl_Id)
3402 Pending_Instantiations.Increment_Last;
3403 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3404 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3405 Check_Forward_Instantiation (Gen_Decl);
3407 -- The wrapper package is always delayed, because it does
3408 -- not constitute a freeze point, but to insure that the
3409 -- freeze node is placed properly, it is created directly
3410 -- when instantiating the body (otherwise the freeze node
3411 -- might appear to early for nested instantiations).
3413 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3415 -- For ASIS purposes, indicate that the wrapper package has
3416 -- replaced the instantiation node.
3418 Rewrite (N, Unit (Parent (N)));
3419 Set_Unit (Parent (N), N);
3422 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3424 -- Replace instance node for library-level instantiations
3425 -- of intrinsic subprograms, for ASIS use.
3427 Rewrite (N, Unit (Parent (N)));
3428 Set_Unit (Parent (N), N);
3431 if Parent_Installed then
3436 Generic_Renamings.Set_Last (0);
3437 Generic_Renamings_HTable.Reset;
3441 when Instantiation_Error =>
3442 if Parent_Installed then
3445 end Analyze_Subprogram_Instantiation;
3447 -------------------------
3448 -- Get_Associated_Node --
3449 -------------------------
3451 function Get_Associated_Node (N : Node_Id) return Node_Id is
3452 Assoc : Node_Id := Associated_Node (N);
3455 if Nkind (Assoc) /= Nkind (N) then
3458 elsif Nkind (Assoc) = N_Aggregate
3459 or else Nkind (Assoc) = N_Extension_Aggregate
3463 -- If the node is part of an inner generic, it may itself have been
3464 -- remapped into a further generic copy. Associated_Node is otherwise
3465 -- used for the entity of the node, and will be of a different node
3466 -- kind, or else N has been rewritten as a literal or function call.
3468 while Present (Associated_Node (Assoc))
3469 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3471 Assoc := Associated_Node (Assoc);
3474 -- Follow and additional link in case the final node was rewritten.
3475 -- This can only happen with nested generic units.
3477 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3478 and then Present (Associated_Node (Assoc))
3479 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3481 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3483 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3485 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3487 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3489 Assoc := Associated_Node (Assoc);
3494 end Get_Associated_Node;
3496 -------------------------------------------
3497 -- Build_Instance_Compilation_Unit_Nodes --
3498 -------------------------------------------
3500 procedure Build_Instance_Compilation_Unit_Nodes
3505 Decl_Cunit : Node_Id;
3506 Body_Cunit : Node_Id;
3508 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3509 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3512 -- A new compilation unit node is built for the instance declaration
3515 Make_Compilation_Unit (Sloc (N),
3516 Context_Items => Empty_List,
3519 Make_Compilation_Unit_Aux (Sloc (N)));
3521 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3522 Set_Body_Required (Decl_Cunit, True);
3524 -- We use the original instantiation compilation unit as the resulting
3525 -- compilation unit of the instance, since this is the main unit.
3527 Rewrite (N, Act_Body);
3528 Body_Cunit := Parent (N);
3530 -- The two compilation unit nodes are linked by the Library_Unit field
3532 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3533 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3535 -- Preserve the private nature of the package if needed.
3537 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
3539 -- If the instance is not the main unit, its context, categorization,
3540 -- and elaboration entity are not relevant to the compilation.
3542 if Parent (N) /= Cunit (Main_Unit) then
3546 -- The context clause items on the instantiation, which are now
3547 -- attached to the body compilation unit (since the body overwrote
3548 -- the original instantiation node), semantically belong on the spec,
3549 -- so copy them there. It's harmless to leave them on the body as well.
3550 -- In fact one could argue that they belong in both places.
3552 Citem := First (Context_Items (Body_Cunit));
3553 while Present (Citem) loop
3554 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3558 -- Propagate categorization flags on packages, so that they appear
3559 -- in ali file for the spec of the unit.
3561 if Ekind (New_Main) = E_Package then
3562 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3563 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3564 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3565 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3566 Set_Is_Remote_Call_Interface
3567 (Old_Main, Is_Remote_Call_Interface (New_Main));
3570 -- Make entry in Units table, so that binder can generate call to
3571 -- elaboration procedure for body, if any.
3573 Make_Instance_Unit (Body_Cunit);
3574 Main_Unit_Entity := New_Main;
3575 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3577 -- Build elaboration entity, since the instance may certainly
3578 -- generate elaboration code requiring a flag for protection.
3580 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3581 end Build_Instance_Compilation_Unit_Nodes;
3583 -----------------------------------
3584 -- Check_Formal_Package_Instance --
3585 -----------------------------------
3587 -- If the formal has specific parameters, they must match those of the
3588 -- actual. Both of them are instances, and the renaming declarations
3589 -- for their formal parameters appear in the same order in both. The
3590 -- analyzed formal has been analyzed in the context of the current
3593 procedure Check_Formal_Package_Instance
3594 (Formal_Pack : Entity_Id;
3595 Actual_Pack : Entity_Id)
3597 E1 : Entity_Id := First_Entity (Actual_Pack);
3598 E2 : Entity_Id := First_Entity (Formal_Pack);
3603 procedure Check_Mismatch (B : Boolean);
3604 -- Common error routine for mismatch between the parameters of
3605 -- the actual instance and those of the formal package.
3607 procedure Check_Mismatch (B : Boolean) is
3611 ("actual for & in actual instance does not match formal",
3612 Parent (Actual_Pack), E1);
3616 -- Start of processing for Check_Formal_Package_Instance
3620 and then Present (E2)
3622 exit when Ekind (E1) = E_Package
3623 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3625 if Is_Type (E1) then
3627 -- Subtypes must statically match. E1 and E2 are the
3628 -- local entities that are subtypes of the actuals.
3629 -- Itypes generated for other parameters need not be checked,
3630 -- the check will be performed on the parameters themselves.
3632 if not Is_Itype (E1)
3633 and then not Is_Itype (E2)
3637 or else Etype (E1) /= Etype (E2)
3638 or else not Subtypes_Statically_Match (E1, E2));
3641 elsif Ekind (E1) = E_Constant then
3643 -- IN parameters must denote the same static value, or
3644 -- the same constant, or the literal null.
3646 Expr1 := Expression (Parent (E1));
3648 if Ekind (E2) /= E_Constant then
3649 Check_Mismatch (True);
3652 Expr2 := Expression (Parent (E2));
3655 if Is_Static_Expression (Expr1) then
3657 if not Is_Static_Expression (Expr2) then
3658 Check_Mismatch (True);
3660 elsif Is_Integer_Type (Etype (E1)) then
3663 V1 : constant Uint := Expr_Value (Expr1);
3664 V2 : constant Uint := Expr_Value (Expr2);
3666 Check_Mismatch (V1 /= V2);
3669 elsif Is_Real_Type (Etype (E1)) then
3671 V1 : constant Ureal := Expr_Value_R (Expr1);
3672 V2 : constant Ureal := Expr_Value_R (Expr2);
3674 Check_Mismatch (V1 /= V2);
3677 elsif Is_String_Type (Etype (E1))
3678 and then Nkind (Expr1) = N_String_Literal
3681 if Nkind (Expr2) /= N_String_Literal then
3682 Check_Mismatch (True);
3685 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3689 elsif Is_Entity_Name (Expr1) then
3690 if Is_Entity_Name (Expr2) then
3691 if Entity (Expr1) = Entity (Expr2) then
3694 elsif Ekind (Entity (Expr2)) = E_Constant
3695 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3697 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3701 Check_Mismatch (True);
3704 Check_Mismatch (True);
3707 elsif Nkind (Expr1) = N_Null then
3708 Check_Mismatch (Nkind (Expr1) /= N_Null);
3711 Check_Mismatch (True);
3714 elsif Ekind (E1) = E_Variable
3715 or else Ekind (E1) = E_Package
3718 (Ekind (E1) /= Ekind (E2)
3719 or else Renamed_Object (E1) /= Renamed_Object (E2));
3721 elsif Is_Overloadable (E1) then
3723 -- Verify that the names of the entities match.
3724 -- What if actual is an attribute ???
3727 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3730 raise Program_Error;
3737 end Check_Formal_Package_Instance;
3739 ---------------------------
3740 -- Check_Formal_Packages --
3741 ---------------------------
3743 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3745 Formal_P : Entity_Id;
3748 -- Iterate through the declarations in the instance, looking for
3749 -- package renaming declarations that denote instances of formal
3750 -- packages. Stop when we find the renaming of the current package
3751 -- itself. The declaration for a formal package without a box is
3752 -- followed by an internal entity that repeats the instantiation.
3754 E := First_Entity (P_Id);
3755 while Present (E) loop
3756 if Ekind (E) = E_Package then
3757 if Renamed_Object (E) = P_Id then
3760 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3763 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3764 Formal_P := Next_Entity (E);
3765 Check_Formal_Package_Instance (Formal_P, E);
3771 end Check_Formal_Packages;
3773 ---------------------------------
3774 -- Check_Forward_Instantiation --
3775 ---------------------------------
3777 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3779 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3782 -- The instantiation appears before the generic body if we are in the
3783 -- scope of the unit containing the generic, either in its spec or in
3784 -- the package body. and before the generic body.
3786 if Ekind (Gen_Comp) = E_Package_Body then
3787 Gen_Comp := Spec_Entity (Gen_Comp);
3790 if In_Open_Scopes (Gen_Comp)
3791 and then No (Corresponding_Body (Decl))
3796 and then not Is_Compilation_Unit (S)
3797 and then not Is_Child_Unit (S)
3799 if Ekind (S) = E_Package then
3800 Set_Has_Forward_Instantiation (S);
3806 end Check_Forward_Instantiation;
3808 ---------------------------
3809 -- Check_Generic_Actuals --
3810 ---------------------------
3812 -- The visibility of the actuals may be different between the
3813 -- point of generic instantiation and the instantiation of the body.
3815 procedure Check_Generic_Actuals
3816 (Instance : Entity_Id;
3817 Is_Formal_Box : Boolean)
3823 E := First_Entity (Instance);
3824 while Present (E) loop
3826 and then Nkind (Parent (E)) = N_Subtype_Declaration
3827 and then Scope (Etype (E)) /= Instance
3828 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3830 Check_Private_View (Subtype_Indication (Parent (E)));
3831 Set_Is_Generic_Actual_Type (E, True);
3832 Set_Is_Hidden (E, False);
3834 -- We constructed the generic actual type as a subtype of
3835 -- the supplied type. This means that it normally would not
3836 -- inherit subtype specific attributes of the actual, which
3837 -- is wrong for the generic case.
3839 Astype := Ancestor_Subtype (E);
3843 -- can happen when E is an itype that is the full view of
3844 -- a private type completed, e.g. with a constrained array.
3846 Astype := Base_Type (E);
3849 Set_Size_Info (E, (Astype));
3850 Set_RM_Size (E, RM_Size (Astype));
3851 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3853 if Is_Discrete_Or_Fixed_Point_Type (E) then
3854 Set_RM_Size (E, RM_Size (Astype));
3856 -- In nested instances, the base type of an access actual
3857 -- may itself be private, and need to be exchanged.
3859 elsif Is_Access_Type (E)
3860 and then Is_Private_Type (Etype (E))
3863 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3866 elsif Ekind (E) = E_Package then
3868 -- If this is the renaming for the current instance, we're done.
3869 -- Otherwise it is a formal package. If the corresponding formal
3870 -- was declared with a box, the (instantiations of the) generic
3871 -- formal part are also visible. Otherwise, ignore the entity
3872 -- created to validate the actuals.
3874 if Renamed_Object (E) = Instance then
3877 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3880 -- The visibility of a formal of an enclosing generic is already
3883 elsif Denotes_Formal_Package (E) then
3886 elsif Present (Associated_Formal_Package (E))
3887 and then Box_Present (Parent (Associated_Formal_Package (E)))
3889 Check_Generic_Actuals (Renamed_Object (E), True);
3890 Set_Is_Hidden (E, False);
3893 -- If this is a subprogram instance (in a wrapper package) the
3894 -- actual is fully visible.
3896 elsif Is_Wrapper_Package (Instance) then
3897 Set_Is_Hidden (E, False);
3900 Set_Is_Hidden (E, not Is_Formal_Box);
3905 end Check_Generic_Actuals;
3907 ------------------------------
3908 -- Check_Generic_Child_Unit --
3909 ------------------------------
3911 procedure Check_Generic_Child_Unit
3913 Parent_Installed : in out Boolean)
3915 Loc : constant Source_Ptr := Sloc (Gen_Id);
3916 Gen_Par : Entity_Id := Empty;
3917 Inst_Par : Entity_Id;
3921 function Find_Generic_Child
3925 -- Search generic parent for possible child unit with the given name.
3927 function In_Enclosing_Instance return Boolean;
3928 -- Within an instance of the parent, the child unit may be denoted
3929 -- by a simple name, or an abbreviated expanded name. Examine enclosing
3930 -- scopes to locate a possible parent instantiation.
3932 ------------------------
3933 -- Find_Generic_Child --
3934 ------------------------
3936 function Find_Generic_Child
3944 -- If entity of name is already set, instance has already been
3945 -- resolved, e.g. in an enclosing instantiation.
3947 if Present (Entity (Id)) then
3948 if Scope (Entity (Id)) = Scop then
3955 E := First_Entity (Scop);
3956 while Present (E) loop
3957 if Chars (E) = Chars (Id)
3958 and then Is_Child_Unit (E)
3960 if Is_Child_Unit (E)
3961 and then not Is_Visible_Child_Unit (E)
3964 ("generic child unit& is not visible", Gen_Id, E);
3976 end Find_Generic_Child;
3978 ---------------------------
3979 -- In_Enclosing_Instance --
3980 ---------------------------
3982 function In_Enclosing_Instance return Boolean is
3983 Enclosing_Instance : Node_Id;
3984 Instance_Decl : Node_Id;
3987 Enclosing_Instance := Current_Scope;
3989 while Present (Enclosing_Instance) loop
3990 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
3992 if Ekind (Enclosing_Instance) = E_Package
3993 and then Is_Generic_Instance (Enclosing_Instance)
3995 (Generic_Parent (Specification (Instance_Decl)))
3997 -- Check whether the generic we are looking for is a child
3998 -- of this instance.
4000 E := Find_Generic_Child
4001 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4002 exit when Present (E);
4008 Enclosing_Instance := Scope (Enclosing_Instance);
4020 Make_Expanded_Name (Loc,
4022 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4023 Selector_Name => New_Occurrence_Of (E, Loc)));
4025 Set_Entity (Gen_Id, E);
4026 Set_Etype (Gen_Id, Etype (E));
4027 Parent_Installed := False; -- Already in scope.
4030 end In_Enclosing_Instance;
4032 -- Start of processing for Check_Generic_Child_Unit
4035 -- If the name of the generic is given by a selected component, it
4036 -- may be the name of a generic child unit, and the prefix is the name
4037 -- of an instance of the parent, in which case the child unit must be
4038 -- visible. If this instance is not in scope, it must be placed there
4039 -- and removed after instantiation, because what is being instantiated
4040 -- is not the original child, but the corresponding child present in
4041 -- the instance of the parent.
4043 -- If the child is instantiated within the parent, it can be given by
4044 -- a simple name. In this case the instance is already in scope, but
4045 -- the child generic must be recovered from the generic parent as well.
4047 if Nkind (Gen_Id) = N_Selected_Component then
4048 S := Selector_Name (Gen_Id);
4049 Analyze (Prefix (Gen_Id));
4050 Inst_Par := Entity (Prefix (Gen_Id));
4052 if Ekind (Inst_Par) = E_Package
4053 and then Present (Renamed_Object (Inst_Par))
4055 Inst_Par := Renamed_Object (Inst_Par);
4058 if Ekind (Inst_Par) = E_Package then
4059 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
4060 Gen_Par := Generic_Parent (Parent (Inst_Par));
4062 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
4064 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
4066 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
4069 elsif Ekind (Inst_Par) = E_Generic_Package
4070 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
4072 -- A formal package may be a real child package, and not the
4073 -- implicit instance within a parent. In this case the child is
4074 -- not visible and has to be retrieved explicitly as well.
4076 Gen_Par := Inst_Par;
4079 if Present (Gen_Par) then
4081 -- The prefix denotes an instantiation. The entity itself
4082 -- may be a nested generic, or a child unit.
4084 E := Find_Generic_Child (Gen_Par, S);
4087 Change_Selected_Component_To_Expanded_Name (Gen_Id);
4088 Set_Entity (Gen_Id, E);
4089 Set_Etype (Gen_Id, Etype (E));
4091 Set_Etype (S, Etype (E));
4093 -- Indicate that this is a reference to the parent.
4095 if In_Extended_Main_Source_Unit (Gen_Id) then
4096 Set_Is_Instantiated (Inst_Par);
4099 -- A common mistake is to replicate the naming scheme of
4100 -- a hierarchy by instantiating a generic child directly,
4101 -- rather than the implicit child in a parent instance:
4103 -- generic .. package Gpar is ..
4104 -- generic .. package Gpar.Child is ..
4105 -- package Par is new Gpar ();
4108 -- package Par.Child is new Gpar.Child ();
4109 -- rather than Par.Child
4111 -- In this case the instantiation is within Par, which is
4112 -- an instance, but Gpar does not denote Par because we are
4113 -- not IN the instance of Gpar, so this is illegal. The test
4114 -- below recognizes this particular case.
4116 if Is_Child_Unit (E)
4117 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
4118 and then (not In_Instance
4119 or else Nkind (Parent (Parent (Gen_Id))) =
4123 ("prefix of generic child unit must be instance of parent",
4127 if not In_Open_Scopes (Inst_Par)
4128 and then Nkind (Parent (Gen_Id)) not in
4129 N_Generic_Renaming_Declaration
4131 Install_Parent (Inst_Par);
4132 Parent_Installed := True;
4136 -- If the generic parent does not contain an entity that
4137 -- corresponds to the selector, the instance doesn't either.
4138 -- Analyzing the node will yield the appropriate error message.
4139 -- If the entity is not a child unit, then it is an inner
4140 -- generic in the parent.
4148 if Is_Child_Unit (Entity (Gen_Id))
4150 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4151 and then not In_Open_Scopes (Inst_Par)
4153 Install_Parent (Inst_Par);
4154 Parent_Installed := True;
4158 elsif Nkind (Gen_Id) = N_Expanded_Name then
4160 -- Entity already present, analyze prefix, whose meaning may be
4161 -- an instance in the current context. If it is an instance of
4162 -- a relative within another, the proper parent may still have
4163 -- to be installed, if they are not of the same generation.
4165 Analyze (Prefix (Gen_Id));
4166 Inst_Par := Entity (Prefix (Gen_Id));
4168 if In_Enclosing_Instance then
4171 elsif Present (Entity (Gen_Id))
4172 and then Is_Child_Unit (Entity (Gen_Id))
4173 and then not In_Open_Scopes (Inst_Par)
4175 Install_Parent (Inst_Par);
4176 Parent_Installed := True;
4179 elsif In_Enclosing_Instance then
4181 -- The child unit is found in some enclosing scope
4188 -- If this is the renaming of the implicit child in a parent
4189 -- instance, recover the parent name and install it.
4191 if Is_Entity_Name (Gen_Id) then
4192 E := Entity (Gen_Id);
4194 if Is_Generic_Unit (E)
4195 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
4196 and then Is_Child_Unit (Renamed_Object (E))
4197 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
4198 and then Nkind (Name (Parent (E))) = N_Expanded_Name
4201 New_Copy_Tree (Name (Parent (E))));
4202 Inst_Par := Entity (Prefix (Gen_Id));
4204 if not In_Open_Scopes (Inst_Par) then
4205 Install_Parent (Inst_Par);
4206 Parent_Installed := True;
4209 -- If it is a child unit of a non-generic parent, it may be
4210 -- use-visible and given by a direct name. Install parent as
4213 elsif Is_Generic_Unit (E)
4214 and then Is_Child_Unit (E)
4216 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4217 and then not Is_Generic_Unit (Scope (E))
4219 if not In_Open_Scopes (Scope (E)) then
4220 Install_Parent (Scope (E));
4221 Parent_Installed := True;
4226 end Check_Generic_Child_Unit;
4228 -----------------------------
4229 -- Check_Hidden_Child_Unit --
4230 -----------------------------
4232 procedure Check_Hidden_Child_Unit
4234 Gen_Unit : Entity_Id;
4235 Act_Decl_Id : Entity_Id)
4237 Gen_Id : constant Node_Id := Name (N);
4240 if Is_Child_Unit (Gen_Unit)
4241 and then Is_Child_Unit (Act_Decl_Id)
4242 and then Nkind (Gen_Id) = N_Expanded_Name
4243 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4244 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4246 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4248 ("generic unit & is implicitly declared in &",
4249 Defining_Unit_Name (N), Gen_Unit);
4250 Error_Msg_N ("\instance must have different name",
4251 Defining_Unit_Name (N));
4253 end Check_Hidden_Child_Unit;
4255 ------------------------
4256 -- Check_Private_View --
4257 ------------------------
4259 procedure Check_Private_View (N : Node_Id) is
4260 T : constant Entity_Id := Etype (N);
4264 -- Exchange views if the type was not private in the generic but is
4265 -- private at the point of instantiation. Do not exchange views if
4266 -- the scope of the type is in scope. This can happen if both generic
4267 -- and instance are sibling units, or if type is defined in a parent.
4268 -- In this case the visibility of the type will be correct for all
4272 BT := Base_Type (T);
4274 if Is_Private_Type (T)
4275 and then not Has_Private_View (N)
4276 and then Present (Full_View (T))
4277 and then not In_Open_Scopes (Scope (T))
4279 -- In the generic, the full type was visible. Save the
4280 -- private entity, for subsequent exchange.
4284 elsif Has_Private_View (N)
4285 and then not Is_Private_Type (T)
4286 and then not Has_Been_Exchanged (T)
4287 and then Etype (Get_Associated_Node (N)) /= T
4289 -- Only the private declaration was visible in the generic. If
4290 -- the type appears in a subtype declaration, the subtype in the
4291 -- instance must have a view compatible with that of its parent,
4292 -- which must be exchanged (see corresponding code in Restore_
4293 -- Private_Views). Otherwise, if the type is defined in a parent
4294 -- unit, leave full visibility within instance, which is safe.
4296 if In_Open_Scopes (Scope (Base_Type (T)))
4297 and then not Is_Private_Type (Base_Type (T))
4298 and then Comes_From_Source (Base_Type (T))
4302 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4303 or else not In_Private_Part (Scope (Base_Type (T)))
4305 Append_Elmt (T, Exchanged_Views);
4306 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4309 -- For composite types with inconsistent representation
4310 -- exchange component types accordingly.
4312 elsif Is_Access_Type (T)
4313 and then Is_Private_Type (Designated_Type (T))
4314 and then not Has_Private_View (N)
4315 and then Present (Full_View (Designated_Type (T)))
4317 Switch_View (Designated_Type (T));
4319 elsif Is_Array_Type (T)
4320 and then Is_Private_Type (Component_Type (T))
4321 and then not Has_Private_View (N)
4322 and then Present (Full_View (Component_Type (T)))
4324 Switch_View (Component_Type (T));
4326 elsif Is_Private_Type (T)
4327 and then Present (Full_View (T))
4328 and then Is_Array_Type (Full_View (T))
4329 and then Is_Private_Type (Component_Type (Full_View (T)))
4333 -- Finally, a non-private subtype may have a private base type,
4334 -- which must be exchanged for consistency. This can happen when
4335 -- instantiating a package body, when the scope stack is empty
4336 -- but in fact the subtype and the base type are declared in an
4339 elsif not Is_Private_Type (T)
4340 and then not Has_Private_View (N)
4341 and then Is_Private_Type (Base_Type (T))
4342 and then Present (Full_View (BT))
4343 and then not Is_Generic_Type (BT)
4344 and then not In_Open_Scopes (BT)
4346 Append_Elmt (Full_View (BT), Exchanged_Views);
4347 Exchange_Declarations (BT);
4350 end Check_Private_View;
4352 --------------------------
4353 -- Contains_Instance_Of --
4354 --------------------------
4356 function Contains_Instance_Of
4368 -- Verify that there are no circular instantiations. We check whether
4369 -- the unit contains an instance of the current scope or some enclosing
4370 -- scope (in case one of the instances appears in a subunit). Longer
4371 -- circularities involving subunits might seem too pathological to
4372 -- consider, but they were not too pathological for the authors of
4373 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4374 -- enclosing generic scopes as containing an instance.
4377 -- Within a generic subprogram body, the scope is not generic, to
4378 -- allow for recursive subprograms. Use the declaration to determine
4379 -- whether this is a generic unit.
4381 if Ekind (Scop) = E_Generic_Package
4382 or else (Is_Subprogram (Scop)
4383 and then Nkind (Unit_Declaration_Node (Scop)) =
4384 N_Generic_Subprogram_Declaration)
4386 Elmt := First_Elmt (Inner_Instances (Inner));
4388 while Present (Elmt) loop
4389 if Node (Elmt) = Scop then
4390 Error_Msg_Node_2 := Inner;
4392 ("circular Instantiation: & instantiated within &!",
4396 elsif Node (Elmt) = Inner then
4399 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4400 Error_Msg_Node_2 := Inner;
4402 ("circular Instantiation: & instantiated within &!",
4410 -- Indicate that Inner is being instantiated within Scop.
4412 Append_Elmt (Inner, Inner_Instances (Scop));
4415 if Scop = Standard_Standard then
4418 Scop := Scope (Scop);
4423 end Contains_Instance_Of;
4425 -----------------------
4426 -- Copy_Generic_Node --
4427 -----------------------
4429 function Copy_Generic_Node
4431 Parent_Id : Node_Id;
4432 Instantiating : Boolean)
4438 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4439 -- Check the given value of one of the Fields referenced by the
4440 -- current node to determine whether to copy it recursively. The
4441 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4442 -- value (Sloc, Uint, Char) in which case it need not be copied.
4444 procedure Copy_Descendants;
4445 -- Common utility for various nodes.
4447 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4448 -- Make copy of element list.
4450 function Copy_Generic_List
4452 Parent_Id : Node_Id)
4454 -- Apply Copy_Node recursively to the members of a node list.
4456 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4457 -- True if an identifier is part of the defining program unit name
4458 -- of a child unit. The entity of such an identifier must be kept
4459 -- (for ASIS use) even though as the name of an enclosing generic
4460 -- it would otherwise not be preserved in the generic tree.
4462 -----------------------
4463 -- Copy_Descendants --
4464 -----------------------
4466 procedure Copy_Descendants is
4468 use Atree.Unchecked_Access;
4469 -- This code section is part of the implementation of an untyped
4470 -- tree traversal, so it needs direct access to node fields.
4473 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4474 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4475 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4476 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4477 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4478 end Copy_Descendants;
4480 -----------------------------
4481 -- Copy_Generic_Descendant --
4482 -----------------------------
4484 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4486 if D = Union_Id (Empty) then
4489 elsif D in Node_Range then
4491 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4493 elsif D in List_Range then
4494 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4496 elsif D in Elist_Range then
4497 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4499 -- Nothing else is copyable (e.g. Uint values), return as is
4504 end Copy_Generic_Descendant;
4506 ------------------------
4507 -- Copy_Generic_Elist --
4508 ------------------------
4510 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4517 M := First_Elmt (E);
4518 while Present (M) loop
4520 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4529 end Copy_Generic_Elist;
4531 -----------------------
4532 -- Copy_Generic_List --
4533 -----------------------
4535 function Copy_Generic_List
4537 Parent_Id : Node_Id)
4546 Set_Parent (New_L, Parent_Id);
4549 while Present (N) loop
4550 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4559 end Copy_Generic_List;
4561 ---------------------------
4562 -- In_Defining_Unit_Name --
4563 ---------------------------
4565 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4567 return Present (Parent (Nam))
4568 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4570 (Nkind (Parent (Nam)) = N_Expanded_Name
4571 and then In_Defining_Unit_Name (Parent (Nam))));
4572 end In_Defining_Unit_Name;
4574 -- Start of processing for Copy_Generic_Node
4581 New_N := New_Copy (N);
4583 if Instantiating then
4584 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4587 if not Is_List_Member (N) then
4588 Set_Parent (New_N, Parent_Id);
4591 -- If defining identifier, then all fields have been copied already
4593 if Nkind (New_N) in N_Entity then
4596 -- Special casing for identifiers and other entity names and operators
4598 elsif Nkind (New_N) = N_Identifier
4599 or else Nkind (New_N) = N_Character_Literal
4600 or else Nkind (New_N) = N_Expanded_Name
4601 or else Nkind (New_N) = N_Operator_Symbol
4602 or else Nkind (New_N) in N_Op
4604 if not Instantiating then
4606 -- Link both nodes in order to assign subsequently the
4607 -- entity of the copy to the original node, in case this
4608 -- is a global reference.
4610 Set_Associated_Node (N, New_N);
4612 -- If we are within an instantiation, this is a nested generic
4613 -- that has already been analyzed at the point of definition. We
4614 -- must preserve references that were global to the enclosing
4615 -- parent at that point. Other occurrences, whether global or
4616 -- local to the current generic, must be resolved anew, so we
4617 -- reset the entity in the generic copy. A global reference has
4618 -- a smaller depth than the parent, or else the same depth in
4619 -- case both are distinct compilation units.
4621 -- It is also possible for Current_Instantiated_Parent to be
4622 -- defined, and for this not to be a nested generic, namely
4623 -- if the unit is loaded through Rtsfind. In that case, the
4624 -- entity of New_N is only a link to the associated node, and
4625 -- not a defining occurrence.
4627 -- The entities for parent units in the defining_program_unit
4628 -- of a generic child unit are established when the context of
4629 -- the unit is first analyzed, before the generic copy is made.
4630 -- They are preserved in the copy for use in ASIS queries.
4632 Ent := Entity (New_N);
4634 if No (Current_Instantiated_Parent.Gen_Id) then
4636 or else Nkind (Ent) /= N_Defining_Identifier
4637 or else not In_Defining_Unit_Name (N)
4639 Set_Associated_Node (New_N, Empty);
4644 not (Nkind (Ent) = N_Defining_Identifier
4646 Nkind (Ent) = N_Defining_Character_Literal
4648 Nkind (Ent) = N_Defining_Operator_Symbol)
4649 or else No (Scope (Ent))
4650 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4651 or else (Scope_Depth (Scope (Ent)) >
4652 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4654 Get_Source_Unit (Ent) =
4655 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4657 Set_Associated_Node (New_N, Empty);
4660 -- Case of instantiating identifier or some other name or operator
4663 -- If the associated node is still defined, the entity in
4664 -- it is global, and must be copied to the instance.
4665 -- If this copy is being made for a body to inline, it is
4666 -- applied to an instantiated tree, and the entity is already
4667 -- present and must be also preserved.
4670 Assoc : constant Node_Id := Get_Associated_Node (N);
4672 if Present (Assoc) then
4673 if Nkind (Assoc) = Nkind (N) then
4674 Set_Entity (New_N, Entity (Assoc));
4675 Check_Private_View (N);
4677 elsif Nkind (Assoc) = N_Function_Call then
4678 Set_Entity (New_N, Entity (Name (Assoc)));
4680 elsif (Nkind (Assoc) = N_Defining_Identifier
4681 or else Nkind (Assoc) = N_Defining_Character_Literal
4682 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
4683 and then Expander_Active
4685 -- Inlining case: we are copying a tree that contains
4686 -- global entities, which are preserved in the copy
4687 -- to be used for subsequent inlining.
4692 Set_Entity (New_N, Empty);
4698 -- For expanded name, we must copy the Prefix and Selector_Name
4700 if Nkind (N) = N_Expanded_Name then
4702 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4704 Set_Selector_Name (New_N,
4705 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4707 -- For operators, we must copy the right operand
4709 elsif Nkind (N) in N_Op then
4710 Set_Right_Opnd (New_N,
4711 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4713 -- And for binary operators, the left operand as well
4715 if Nkind (N) in N_Binary_Op then
4716 Set_Left_Opnd (New_N,
4717 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4721 -- Special casing for stubs
4723 elsif Nkind (N) in N_Body_Stub then
4725 -- In any case, we must copy the specification or defining
4726 -- identifier as appropriate.
4728 if Nkind (N) = N_Subprogram_Body_Stub then
4729 Set_Specification (New_N,
4730 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4733 Set_Defining_Identifier (New_N,
4735 (Defining_Identifier (N), New_N, Instantiating));
4738 -- If we are not instantiating, then this is where we load and
4739 -- analyze subunits, i.e. at the point where the stub occurs. A
4740 -- more permissivle system might defer this analysis to the point
4741 -- of instantiation, but this seems to complicated for now.
4743 if not Instantiating then
4745 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4747 Unum : Unit_Number_Type;
4753 (Load_Name => Subunit_Name,
4758 -- If the proper body is not found, a warning message will
4759 -- be emitted when analyzing the stub, or later at the the
4760 -- point of instantiation. Here we just leave the stub as is.
4762 if Unum = No_Unit then
4763 Subunits_Missing := True;
4764 goto Subunit_Not_Found;
4767 Subunit := Cunit (Unum);
4769 if Nkind (Unit (Subunit)) /= N_Subunit then
4770 Error_Msg_Sloc := Sloc (N);
4772 ("expected SEPARATE subunit to complete stub at#,"
4773 & " found child unit", Subunit);
4774 goto Subunit_Not_Found;
4777 -- We must create a generic copy of the subunit, in order
4778 -- to perform semantic analysis on it, and we must replace
4779 -- the stub in the original generic unit with the subunit,
4780 -- in order to preserve non-local references within.
4782 -- Only the proper body needs to be copied. Library_Unit and
4783 -- context clause are simply inherited by the generic copy.
4784 -- Note that the copy (which may be recursive if there are
4785 -- nested subunits) must be done first, before attaching it
4786 -- to the enclosing generic.
4790 (Proper_Body (Unit (Subunit)),
4791 Empty, Instantiating => False);
4793 -- Now place the original proper body in the original
4794 -- generic unit. This is a body, not a compilation unit.
4796 Rewrite (N, Proper_Body (Unit (Subunit)));
4797 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4798 Set_Was_Originally_Stub (N);
4800 -- Finally replace the body of the subunit with its copy,
4801 -- and make this new subunit into the library unit of the
4802 -- generic copy, which does not have stubs any longer.
4804 Set_Proper_Body (Unit (Subunit), New_Body);
4805 Set_Library_Unit (New_N, Subunit);
4806 Inherit_Context (Unit (Subunit), N);
4809 -- If we are instantiating, this must be an error case, since
4810 -- otherwise we would have replaced the stub node by the proper
4811 -- body that corresponds. So just ignore it in the copy (i.e.
4812 -- we have copied it, and that is good enough).
4818 <<Subunit_Not_Found>> null;
4820 -- If the node is a compilation unit, it is the subunit of a stub,
4821 -- which has been loaded already (see code below). In this case,
4822 -- the library unit field of N points to the parent unit (which
4823 -- is a compilation unit) and need not (and cannot!) be copied.
4825 -- When the proper body of the stub is analyzed, thie library_unit
4826 -- link is used to establish the proper context (see sem_ch10).
4828 -- The other fields of a compilation unit are copied as usual
4830 elsif Nkind (N) = N_Compilation_Unit then
4832 -- This code can only be executed when not instantiating, because
4833 -- in the copy made for an instantiation, the compilation unit
4834 -- node has disappeared at the point that a stub is replaced by
4837 pragma Assert (not Instantiating);
4839 Set_Context_Items (New_N,
4840 Copy_Generic_List (Context_Items (N), New_N));
4843 Copy_Generic_Node (Unit (N), New_N, False));
4845 Set_First_Inlined_Subprogram (New_N,
4847 (First_Inlined_Subprogram (N), New_N, False));
4849 Set_Aux_Decls_Node (New_N,
4850 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4852 -- For an assignment node, the assignment is known to be semantically
4853 -- legal if we are instantiating the template. This avoids incorrect
4854 -- diagnostics in generated code.
4856 elsif Nkind (N) = N_Assignment_Statement then
4858 -- Copy name and expression fields in usual manner
4861 Copy_Generic_Node (Name (N), New_N, Instantiating));
4863 Set_Expression (New_N,
4864 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4866 if Instantiating then
4867 Set_Assignment_OK (Name (New_N), True);
4870 elsif Nkind (N) = N_Aggregate
4871 or else Nkind (N) = N_Extension_Aggregate
4874 if not Instantiating then
4875 Set_Associated_Node (N, New_N);
4878 if Present (Get_Associated_Node (N))
4879 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4881 -- In the generic the aggregate has some composite type. If at
4882 -- the point of instantiation the type has a private view,
4883 -- install the full view (and that of its ancestors, if any).
4886 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4891 and then Is_Private_Type (T)
4897 and then Is_Tagged_Type (T)
4898 and then Is_Derived_Type (T)
4900 Rt := Root_Type (T);
4905 if Is_Private_Type (T) then
4916 -- Do not copy the associated node, which points to
4917 -- the generic copy of the aggregate.
4920 use Atree.Unchecked_Access;
4921 -- This code section is part of the implementation of an untyped
4922 -- tree traversal, so it needs direct access to node fields.
4925 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4926 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4927 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4928 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4931 -- Allocators do not have an identifier denoting the access type,
4932 -- so we must locate it through the expression to check whether
4933 -- the views are consistent.
4935 elsif Nkind (N) = N_Allocator
4936 and then Nkind (Expression (N)) = N_Qualified_Expression
4937 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
4938 and then Instantiating
4941 T : constant Node_Id :=
4942 Get_Associated_Node (Subtype_Mark (Expression (N)));
4947 -- Retrieve the allocator node in the generic copy.
4949 Acc_T := Etype (Parent (Parent (T)));
4951 and then Is_Private_Type (Acc_T)
4953 Switch_View (Acc_T);
4960 -- For a proper body, we must catch the case of a proper body that
4961 -- replaces a stub. This represents the point at which a separate
4962 -- compilation unit, and hence template file, may be referenced, so
4963 -- we must make a new source instantiation entry for the template
4964 -- of the subunit, and ensure that all nodes in the subunit are
4965 -- adjusted using this new source instantiation entry.
4967 elsif Nkind (N) in N_Proper_Body then
4969 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4972 if Instantiating and then Was_Originally_Stub (N) then
4973 Create_Instantiation_Source
4974 (Instantiation_Node,
4975 Defining_Entity (N),
4980 -- Now copy the fields of the proper body, using the new
4981 -- adjustment factor if one was needed as per test above.
4985 -- Restore the original adjustment factor in case changed
4987 S_Adjustment := Save_Adjustment;
4990 -- Don't copy Ident or Comment pragmas, since the comment belongs
4991 -- to the generic unit, not to the instantiating unit.
4993 elsif Nkind (N) = N_Pragma
4994 and then Instantiating
4997 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
5000 if Prag_Id = Pragma_Ident
5001 or else Prag_Id = Pragma_Comment
5003 New_N := Make_Null_Statement (Sloc (N));
5010 elsif Nkind (N) = N_Integer_Literal
5011 or else Nkind (N) = N_Real_Literal
5013 -- No descendant fields need traversing
5017 -- For the remaining nodes, copy recursively their descendants
5023 and then Nkind (N) = N_Subprogram_Body
5025 Set_Generic_Parent (Specification (New_N), N);
5030 end Copy_Generic_Node;
5032 ----------------------------
5033 -- Denotes_Formal_Package --
5034 ----------------------------
5036 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
5037 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
5038 Scop : constant Entity_Id := Scope (Pack);
5042 if Ekind (Scop) = E_Generic_Package
5043 or else Nkind (Unit_Declaration_Node (Scop)) =
5044 N_Generic_Subprogram_Declaration
5048 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
5055 -- Check whether this package is associated with a formal
5056 -- package of the enclosing instantiation. Iterate over the
5057 -- list of renamings.
5059 E := First_Entity (Par);
5060 while Present (E) loop
5061 if Ekind (E) /= E_Package
5062 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
5065 elsif Renamed_Object (E) = Par then
5068 elsif Renamed_Object (E) = Pack then
5077 end Denotes_Formal_Package;
5083 procedure End_Generic is
5085 -- ??? More things could be factored out in this
5086 -- routine. Should probably be done at a later stage.
5088 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
5089 Generic_Flags.Decrement_Last;
5091 Expander_Mode_Restore;
5094 ----------------------
5095 -- Find_Actual_Type --
5096 ----------------------
5098 function Find_Actual_Type
5100 Gen_Scope : Entity_Id)
5106 if not Is_Child_Unit (Gen_Scope) then
5107 return Get_Instance_Of (Typ);
5109 elsif not Is_Generic_Type (Typ)
5110 or else Scope (Typ) = Gen_Scope
5112 return Get_Instance_Of (Typ);
5115 T := Current_Entity (Typ);
5116 while Present (T) loop
5117 if In_Open_Scopes (Scope (T)) then
5126 end Find_Actual_Type;
5128 ----------------------------
5129 -- Freeze_Subprogram_Body --
5130 ----------------------------
5132 procedure Freeze_Subprogram_Body
5133 (Inst_Node : Node_Id;
5135 Pack_Id : Entity_Id)
5138 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
5139 Par : constant Entity_Id := Scope (Gen_Unit);
5144 function Earlier (N1, N2 : Node_Id) return Boolean;
5145 -- Yields True if N1 and N2 appear in the same compilation unit,
5146 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5147 -- traversal of the tree for the unit.
5149 function Enclosing_Body (N : Node_Id) return Node_Id;
5150 -- Find innermost package body that encloses the given node, and which
5151 -- is not a compilation unit. Freeze nodes for the instance, or for its
5152 -- enclosing body, may be inserted after the enclosing_body of the
5155 function Package_Freeze_Node (B : Node_Id) return Node_Id;
5156 -- Find entity for given package body, and locate or create a freeze
5159 function True_Parent (N : Node_Id) return Node_Id;
5160 -- For a subunit, return parent of corresponding stub.
5166 function Earlier (N1, N2 : Node_Id) return Boolean is
5172 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
5173 -- Find distance from given node to enclosing compilation unit.
5179 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
5182 and then Nkind (P) /= N_Compilation_Unit
5184 P := True_Parent (P);
5189 -- Start of procesing for Earlier
5192 Find_Depth (P1, D1);
5193 Find_Depth (P2, D2);
5203 P1 := True_Parent (P1);
5208 P2 := True_Parent (P2);
5212 -- At this point P1 and P2 are at the same distance from the root.
5213 -- We examine their parents until we find a common declarative
5214 -- list, at which point we can establish their relative placement
5215 -- by comparing their ultimate slocs. If we reach the root,
5216 -- N1 and N2 do not descend from the same declarative list (e.g.
5217 -- one is nested in the declarative part and the other is in a block
5218 -- in the statement part) and the earlier one is already frozen.
5220 while not Is_List_Member (P1)
5221 or else not Is_List_Member (P2)
5222 or else List_Containing (P1) /= List_Containing (P2)
5224 P1 := True_Parent (P1);
5225 P2 := True_Parent (P2);
5227 if Nkind (Parent (P1)) = N_Subunit then
5228 P1 := Corresponding_Stub (Parent (P1));
5231 if Nkind (Parent (P2)) = N_Subunit then
5232 P2 := Corresponding_Stub (Parent (P2));
5241 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
5244 --------------------
5245 -- Enclosing_Body --
5246 --------------------
5248 function Enclosing_Body (N : Node_Id) return Node_Id is
5249 P : Node_Id := Parent (N);
5253 and then Nkind (Parent (P)) /= N_Compilation_Unit
5255 if Nkind (P) = N_Package_Body then
5257 if Nkind (Parent (P)) = N_Subunit then
5258 return Corresponding_Stub (Parent (P));
5264 P := True_Parent (P);
5270 -------------------------
5271 -- Package_Freeze_Node --
5272 -------------------------
5274 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5278 if Nkind (B) = N_Package_Body then
5279 Id := Corresponding_Spec (B);
5281 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5282 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5285 Ensure_Freeze_Node (Id);
5286 return Freeze_Node (Id);
5287 end Package_Freeze_Node;
5293 function True_Parent (N : Node_Id) return Node_Id is
5295 if Nkind (Parent (N)) = N_Subunit then
5296 return Parent (Corresponding_Stub (Parent (N)));
5302 -- Start of processing of Freeze_Subprogram_Body
5305 -- If the instance and the generic body appear within the same
5306 -- unit, and the instance preceeds the generic, the freeze node for
5307 -- the instance must appear after that of the generic. If the generic
5308 -- is nested within another instance I2, then current instance must
5309 -- be frozen after I2. In both cases, the freeze nodes are those of
5310 -- enclosing packages. Otherwise, the freeze node is placed at the end
5311 -- of the current declarative part.
5313 Enc_G := Enclosing_Body (Gen_Body);
5314 Enc_I := Enclosing_Body (Inst_Node);
5315 Ensure_Freeze_Node (Pack_Id);
5316 F_Node := Freeze_Node (Pack_Id);
5318 if Is_Generic_Instance (Par)
5319 and then Present (Freeze_Node (Par))
5321 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5323 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5325 -- The parent was a premature instantiation. Insert freeze
5326 -- node at the end the current declarative part.
5328 Insert_After_Last_Decl (Inst_Node, F_Node);
5331 Insert_After (Freeze_Node (Par), F_Node);
5334 -- The body enclosing the instance should be frozen after the body
5335 -- that includes the generic, because the body of the instance may
5336 -- make references to entities therein. If the two are not in the
5337 -- same declarative part, or if the one enclosing the instance is
5338 -- frozen already, freeze the instance at the end of the current
5339 -- declarative part.
5341 elsif Is_Generic_Instance (Par)
5342 and then Present (Freeze_Node (Par))
5343 and then Present (Enc_I)
5345 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5347 (Nkind (Enc_I) = N_Package_Body
5349 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5351 -- The enclosing package may contain several instances. Rather
5352 -- than computing the earliest point at which to insert its
5353 -- freeze node, we place it at the end of the declarative part
5354 -- of the parent of the generic.
5356 Insert_After_Last_Decl
5357 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5360 Insert_After_Last_Decl (Inst_Node, F_Node);
5362 elsif Present (Enc_G)
5363 and then Present (Enc_I)
5364 and then Enc_G /= Enc_I
5365 and then Earlier (Inst_Node, Gen_Body)
5367 if Nkind (Enc_G) = N_Package_Body then
5368 E_G_Id := Corresponding_Spec (Enc_G);
5369 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5371 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5374 -- Freeze package that encloses instance, and place node after
5375 -- package that encloses generic. If enclosing package is already
5376 -- frozen we have to assume it is at the proper place. This may
5377 -- be a potential ABE that requires dynamic checking.
5379 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5381 -- Freeze enclosing subunit before instance
5383 Ensure_Freeze_Node (E_G_Id);
5385 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5386 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5389 Insert_After_Last_Decl (Inst_Node, F_Node);
5392 -- If none of the above, insert freeze node at the end of the
5393 -- current declarative part.
5395 Insert_After_Last_Decl (Inst_Node, F_Node);
5397 end Freeze_Subprogram_Body;
5403 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5405 return Generic_Renamings.Table (E).Gen_Id;
5408 ---------------------
5409 -- Get_Instance_Of --
5410 ---------------------
5412 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5413 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5416 if Res /= Assoc_Null then
5417 return Generic_Renamings.Table (Res).Act_Id;
5419 -- On exit, entity is not instantiated: not a generic parameter,
5420 -- or else parameter of an inner generic unit.
5424 end Get_Instance_Of;
5426 ------------------------------------
5427 -- Get_Package_Instantiation_Node --
5428 ------------------------------------
5430 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5431 Decl : Node_Id := Unit_Declaration_Node (A);
5435 -- If the instantiation is a compilation unit that does not need a
5436 -- body then the instantiation node has been rewritten as a package
5437 -- declaration for the instance, and we return the original node.
5439 -- If it is a compilation unit and the instance node has not been
5440 -- rewritten, then it is still the unit of the compilation. Finally,
5441 -- if a body is present, this is a parent of the main unit whose body
5442 -- has been compiled for inlining purposes, and the instantiation node
5443 -- has been rewritten with the instance body.
5445 -- Otherwise the instantiation node appears after the declaration.
5446 -- If the entity is a formal package, the declaration may have been
5447 -- rewritten as a generic declaration (in the case of a formal with a
5448 -- box) or left as a formal package declaration if it has actuals, and
5449 -- is found with a forward search.
5451 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5452 if Nkind (Decl) = N_Package_Declaration
5453 and then Present (Corresponding_Body (Decl))
5455 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5458 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5459 return Original_Node (Decl);
5461 return Unit (Parent (Decl));
5464 elsif Nkind (Decl) = N_Generic_Package_Declaration
5465 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5467 return Original_Node (Decl);
5470 Inst := Next (Decl);
5471 while Nkind (Inst) /= N_Package_Instantiation
5472 and then Nkind (Inst) /= N_Formal_Package_Declaration
5479 end Get_Package_Instantiation_Node;
5481 ------------------------
5482 -- Has_Been_Exchanged --
5483 ------------------------
5485 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5486 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5489 while Present (Next) loop
5490 if Full_View (Node (Next)) = E then
5498 end Has_Been_Exchanged;
5504 function Hash (F : Entity_Id) return HTable_Range is
5506 return HTable_Range (F mod HTable_Size);
5509 ------------------------
5510 -- Hide_Current_Scope --
5511 ------------------------
5513 procedure Hide_Current_Scope is
5514 C : constant Entity_Id := Current_Scope;
5518 Set_Is_Hidden_Open_Scope (C);
5519 E := First_Entity (C);
5521 while Present (E) loop
5522 if Is_Immediately_Visible (E) then
5523 Set_Is_Immediately_Visible (E, False);
5524 Append_Elmt (E, Hidden_Entities);
5530 -- Make the scope name invisible as well. This is necessary, but
5531 -- might conflict with calls to Rtsfind later on, in case the scope
5532 -- is a predefined one. There is no clean solution to this problem, so
5533 -- for now we depend on the user not redefining Standard itself in one
5534 -- of the parent units.
5536 if Is_Immediately_Visible (C)
5537 and then C /= Standard_Standard
5539 Set_Is_Immediately_Visible (C, False);
5540 Append_Elmt (C, Hidden_Entities);
5543 end Hide_Current_Scope;
5549 procedure Init_Env is
5550 Saved : Instance_Env;
5553 Saved.Ada_83 := Ada_83;
5554 Saved.Instantiated_Parent := Current_Instantiated_Parent;
5555 Saved.Exchanged_Views := Exchanged_Views;
5556 Saved.Hidden_Entities := Hidden_Entities;
5557 Saved.Current_Sem_Unit := Current_Sem_Unit;
5558 Instance_Envs.Increment_Last;
5559 Instance_Envs.Table (Instance_Envs.Last) := Saved;
5561 Exchanged_Views := New_Elmt_List;
5562 Hidden_Entities := New_Elmt_List;
5564 -- Make dummy entry for Instantiated parent. If generic unit is
5565 -- legal, this is set properly in Set_Instance_Env.
5567 Current_Instantiated_Parent :=
5568 (Current_Scope, Current_Scope, Assoc_Null);
5571 ------------------------------
5572 -- In_Same_Declarative_Part --
5573 ------------------------------
5575 function In_Same_Declarative_Part
5580 Decls : constant Node_Id := Parent (F_Node);
5581 Nod : Node_Id := Parent (Inst);
5584 while Present (Nod) loop
5588 elsif Nkind (Nod) = N_Subprogram_Body
5589 or else Nkind (Nod) = N_Package_Body
5590 or else Nkind (Nod) = N_Task_Body
5591 or else Nkind (Nod) = N_Protected_Body
5592 or else Nkind (Nod) = N_Block_Statement
5596 elsif Nkind (Nod) = N_Subunit then
5597 Nod := Corresponding_Stub (Nod);
5599 elsif Nkind (Nod) = N_Compilation_Unit then
5602 Nod := Parent (Nod);
5607 end In_Same_Declarative_Part;
5609 ---------------------
5610 -- Inherit_Context --
5611 ---------------------
5613 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5614 Current_Context : List_Id;
5615 Current_Unit : Node_Id;
5620 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5622 -- The inherited context is attached to the enclosing compilation
5623 -- unit. This is either the main unit, or the declaration for the
5624 -- main unit (in case the instantation appears within the package
5625 -- declaration and the main unit is its body).
5627 Current_Unit := Parent (Inst);
5628 while Present (Current_Unit)
5629 and then Nkind (Current_Unit) /= N_Compilation_Unit
5631 Current_Unit := Parent (Current_Unit);
5634 Current_Context := Context_Items (Current_Unit);
5636 Item := First (Context_Items (Parent (Gen_Decl)));
5637 while Present (Item) loop
5638 if Nkind (Item) = N_With_Clause then
5639 New_I := New_Copy (Item);
5640 Set_Implicit_With (New_I, True);
5641 Append (New_I, Current_Context);
5647 end Inherit_Context;
5653 procedure Initialize is
5655 Generic_Renamings.Init;
5658 Generic_Renamings_HTable.Reset;
5659 Circularity_Detected := False;
5660 Exchanged_Views := No_Elist;
5661 Hidden_Entities := No_Elist;
5664 ----------------------------
5665 -- Insert_After_Last_Decl --
5666 ----------------------------
5668 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5669 L : List_Id := List_Containing (N);
5670 P : constant Node_Id := Parent (L);
5673 if not Is_List_Member (F_Node) then
5674 if Nkind (P) = N_Package_Specification
5675 and then L = Visible_Declarations (P)
5676 and then Present (Private_Declarations (P))
5677 and then not Is_Empty_List (Private_Declarations (P))
5679 L := Private_Declarations (P);
5682 Insert_After (Last (L), F_Node);
5684 end Insert_After_Last_Decl;
5690 procedure Install_Body
5691 (Act_Body : Node_Id;
5696 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
5697 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
5698 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
5699 Par : constant Entity_Id := Scope (Gen_Id);
5700 Gen_Unit : constant Node_Id :=
5701 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5702 Orig_Body : Node_Id := Gen_Body;
5704 Body_Unit : Node_Id;
5706 Must_Delay : Boolean;
5708 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5709 -- Find subprogram (if any) that encloses instance and/or generic body.
5711 function True_Sloc (N : Node_Id) return Source_Ptr;
5712 -- If the instance is nested inside a generic unit, the Sloc of the
5713 -- instance indicates the place of the original definition, not the
5714 -- point of the current enclosing instance. Pending a better usage of
5715 -- Slocs to indicate instantiation places, we determine the place of
5716 -- origin of a node by finding the maximum sloc of any ancestor node.
5717 -- Why is this not equivalent fo Top_Level_Location ???
5719 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5720 Scop : Entity_Id := Scope (Id);
5723 while Scop /= Standard_Standard
5724 and then not Is_Overloadable (Scop)
5726 Scop := Scope (Scop);
5732 function True_Sloc (N : Node_Id) return Source_Ptr is
5739 while Present (N1) and then N1 /= Act_Unit loop
5740 if Sloc (N1) > Res then
5750 -- Start of processing for Install_Body
5753 -- If the body is a subunit, the freeze point is the corresponding
5754 -- stub in the current compilation, not the subunit itself.
5756 if Nkind (Parent (Gen_Body)) = N_Subunit then
5757 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5759 Orig_Body := Gen_Body;
5762 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5764 -- If the instantiation and the generic definition appear in the
5765 -- same package declaration, this is an early instantiation.
5766 -- If they appear in the same declarative part, it is an early
5767 -- instantiation only if the generic body appears textually later,
5768 -- and the generic body is also in the main unit.
5770 -- If instance is nested within a subprogram, and the generic body is
5771 -- not, the instance is delayed because the enclosing body is. If
5772 -- instance and body are within the same scope, or the same sub-
5773 -- program body, indicate explicitly that the instance is delayed.
5776 (Gen_Unit = Act_Unit
5777 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5778 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5779 or else (Gen_Unit = Body_Unit
5780 and then True_Sloc (N) < Sloc (Orig_Body)))
5781 and then Is_In_Main_Unit (Gen_Unit)
5782 and then (Scope (Act_Id) = Scope (Gen_Id)
5784 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5786 -- If this is an early instantiation, the freeze node is placed after
5787 -- the generic body. Otherwise, if the generic appears in an instance,
5788 -- we cannot freeze the current instance until the outer one is frozen.
5789 -- This is only relevant if the current instance is nested within some
5790 -- inner scope not itself within the outer instance. If this scope is
5791 -- a package body in the same declarative part as the outer instance,
5792 -- then that body needs to be frozen after the outer instance. Finally,
5793 -- if no delay is needed, we place the freeze node at the end of the
5794 -- current declarative part.
5796 if Expander_Active then
5797 Ensure_Freeze_Node (Act_Id);
5798 F_Node := Freeze_Node (Act_Id);
5801 Insert_After (Orig_Body, F_Node);
5803 elsif Is_Generic_Instance (Par)
5804 and then Present (Freeze_Node (Par))
5805 and then Scope (Act_Id) /= Par
5807 -- Freeze instance of inner generic after instance of enclosing
5810 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5811 Insert_After (Freeze_Node (Par), F_Node);
5813 -- Freeze package enclosing instance of inner generic after
5814 -- instance of enclosing generic.
5816 elsif Nkind (Parent (N)) = N_Package_Body
5817 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5821 Enclosing : constant Entity_Id :=
5822 Corresponding_Spec (Parent (N));
5825 Insert_After_Last_Decl (N, F_Node);
5826 Ensure_Freeze_Node (Enclosing);
5828 if not Is_List_Member (Freeze_Node (Enclosing)) then
5829 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5834 Insert_After_Last_Decl (N, F_Node);
5838 Insert_After_Last_Decl (N, F_Node);
5842 Set_Is_Frozen (Act_Id);
5843 Insert_Before (N, Act_Body);
5844 Mark_Rewrite_Insertion (Act_Body);
5847 --------------------
5848 -- Install_Parent --
5849 --------------------
5851 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5852 Ancestors : constant Elist_Id := New_Elmt_List;
5853 S : constant Entity_Id := Current_Scope;
5854 Inst_Par : Entity_Id;
5855 First_Par : Entity_Id;
5856 Inst_Node : Node_Id;
5857 Gen_Par : Entity_Id;
5858 First_Gen : Entity_Id;
5861 procedure Install_Formal_Packages (Par : Entity_Id);
5862 -- If any of the formals of the parent are formal packages with box,
5863 -- their formal parts are visible in the parent and thus in the child
5864 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5865 -- for the unit itself.
5867 procedure Install_Noninstance_Specs (Par : Entity_Id);
5868 -- Install the scopes of noninstance parent units ending with Par.
5870 procedure Install_Spec (Par : Entity_Id);
5871 -- The child unit is within the declarative part of the parent, so
5872 -- the declarations within the parent are immediately visible.
5874 -----------------------------
5875 -- Install_Formal_Packages --
5876 -----------------------------
5878 procedure Install_Formal_Packages (Par : Entity_Id) is
5882 E := First_Entity (Par);
5884 while Present (E) loop
5886 if Ekind (E) = E_Package
5887 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5889 -- If this is the renaming for the parent instance, done.
5891 if Renamed_Object (E) = Par then
5894 -- The visibility of a formal of an enclosing generic is
5897 elsif Denotes_Formal_Package (E) then
5900 elsif Present (Associated_Formal_Package (E))
5901 and then Box_Present (Parent (Associated_Formal_Package (E)))
5903 Check_Generic_Actuals (Renamed_Object (E), True);
5904 Set_Is_Hidden (E, False);
5910 end Install_Formal_Packages;
5912 -------------------------------
5913 -- Install_Noninstance_Specs --
5914 -------------------------------
5916 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5919 and then Par /= Standard_Standard
5920 and then not In_Open_Scopes (Par)
5922 Install_Noninstance_Specs (Scope (Par));
5925 end Install_Noninstance_Specs;
5931 procedure Install_Spec (Par : Entity_Id) is
5932 Spec : constant Node_Id :=
5933 Specification (Unit_Declaration_Node (Par));
5937 Set_Is_Immediately_Visible (Par);
5938 Install_Visible_Declarations (Par);
5939 Install_Private_Declarations (Par);
5940 Set_Use (Visible_Declarations (Spec));
5941 Set_Use (Private_Declarations (Spec));
5944 -- Start of processing for Install_Parent
5947 -- We need to install the parent instance to compile the instantiation
5948 -- of the child, but the child instance must appear in the current
5949 -- scope. Given that we cannot place the parent above the current
5950 -- scope in the scope stack, we duplicate the current scope and unstack
5951 -- both after the instantiation is complete.
5953 -- If the parent is itself the instantiation of a child unit, we must
5954 -- also stack the instantiation of its parent, and so on. Each such
5955 -- ancestor is the prefix of the name in a prior instantiation.
5957 -- If this is a nested instance, the parent unit itself resolves to
5958 -- a renaming of the parent instance, whose declaration we need.
5960 -- Finally, the parent may be a generic (not an instance) when the
5961 -- child unit appears as a formal package.
5965 if Present (Renamed_Entity (Inst_Par)) then
5966 Inst_Par := Renamed_Entity (Inst_Par);
5969 First_Par := Inst_Par;
5972 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5974 First_Gen := Gen_Par;
5976 while Present (Gen_Par)
5977 and then Is_Child_Unit (Gen_Par)
5979 -- Load grandparent instance as well
5981 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5983 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5984 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5986 if Present (Renamed_Entity (Inst_Par)) then
5987 Inst_Par := Renamed_Entity (Inst_Par);
5992 (Specification (Unit_Declaration_Node (Inst_Par)));
5994 if Present (Gen_Par) then
5995 Prepend_Elmt (Inst_Par, Ancestors);
5998 -- Parent is not the name of an instantiation
6000 Install_Noninstance_Specs (Inst_Par);
6012 if Present (First_Gen) then
6013 Append_Elmt (First_Par, Ancestors);
6016 Install_Noninstance_Specs (First_Par);
6019 if not Is_Empty_Elmt_List (Ancestors) then
6020 Elmt := First_Elmt (Ancestors);
6022 while Present (Elmt) loop
6023 Install_Spec (Node (Elmt));
6024 Install_Formal_Packages (Node (Elmt));
6035 --------------------------------
6036 -- Instantiate_Formal_Package --
6037 --------------------------------
6039 function Instantiate_Formal_Package
6042 Analyzed_Formal : Node_Id)
6045 Loc : constant Source_Ptr := Sloc (Actual);
6046 Actual_Pack : Entity_Id;
6047 Formal_Pack : Entity_Id;
6048 Gen_Parent : Entity_Id;
6051 Parent_Spec : Node_Id;
6053 procedure Find_Matching_Actual
6055 Act : in out Entity_Id);
6056 -- We need to associate each formal entity in the formal package
6057 -- with the corresponding entity in the actual package. The actual
6058 -- package has been analyzed and possibly expanded, and as a result
6059 -- there is no one-to-one correspondence between the two lists (for
6060 -- example, the actual may include subtypes, itypes, and inherited
6061 -- primitive operations, interspersed among the renaming declarations
6062 -- for the actuals) . We retrieve the corresponding actual by name
6063 -- because each actual has the same name as the formal, and they do
6064 -- appear in the same order.
6066 function Formal_Entity
6068 Act_Ent : Entity_Id)
6070 -- Returns the entity associated with the given formal F. In the
6071 -- case where F is a formal package, this function will iterate
6072 -- through all of F's formals and enter map associations from the
6073 -- actuals occurring in the formal package's corresponding actual
6074 -- package (obtained via Act_Ent) to the formal package's formal
6075 -- parameters. This function is called recursively for arbitrary
6076 -- levels of formal packages.
6078 function Is_Instance_Of
6079 (Act_Spec : Entity_Id;
6080 Gen_Anc : Entity_Id)
6082 -- The actual can be an instantiation of a generic within another
6083 -- instance, in which case there is no direct link from it to the
6084 -- original generic ancestor. In that case, we recognize that the
6085 -- ultimate ancestor is the same by examining names and scopes.
6087 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
6088 -- Within the generic part, entities in the formal package are
6089 -- visible. To validate subsequent type declarations, indicate
6090 -- the correspondence betwen the entities in the analyzed formal,
6091 -- and the entities in the actual package. There are three packages
6092 -- involved in the instantiation of a formal package: the parent
6093 -- generic P1 which appears in the generic declaration, the fake
6094 -- instantiation P2 which appears in the analyzed generic, and whose
6095 -- visible entities may be used in subsequent formals, and the actual
6096 -- P3 in the instance. To validate subsequent formals, me indicate
6097 -- that the entities in P2 are mapped into those of P3. The mapping of
6098 -- entities has to be done recursively for nested packages.
6100 --------------------------
6101 -- Find_Matching_Actual --
6102 --------------------------
6104 procedure Find_Matching_Actual
6106 Act : in out Entity_Id)
6108 Formal_Ent : Entity_Id;
6111 case Nkind (Original_Node (F)) is
6112 when N_Formal_Object_Declaration |
6113 N_Formal_Type_Declaration =>
6114 Formal_Ent := Defining_Identifier (F);
6116 while Chars (Act) /= Chars (Formal_Ent) loop
6120 when N_Formal_Subprogram_Declaration |
6121 N_Formal_Package_Declaration |
6122 N_Package_Declaration |
6123 N_Generic_Package_Declaration =>
6124 Formal_Ent := Defining_Entity (F);
6126 while Chars (Act) /= Chars (Formal_Ent) loop
6132 pragma Assert (False);
6134 end Find_Matching_Actual;
6140 function Formal_Entity
6142 Act_Ent : Entity_Id)
6145 Orig_Node : Node_Id := F;
6146 Act_Pkg : Entity_Id;
6149 case Nkind (Original_Node (F)) is
6150 when N_Formal_Object_Declaration =>
6151 return Defining_Identifier (F);
6153 when N_Formal_Type_Declaration =>
6154 return Defining_Identifier (F);
6156 when N_Formal_Subprogram_Declaration =>
6157 return Defining_Unit_Name (Specification (F));
6159 when N_Package_Declaration =>
6160 return Defining_Unit_Name (Specification (F));
6162 when N_Formal_Package_Declaration |
6163 N_Generic_Package_Declaration =>
6165 if Nkind (F) = N_Generic_Package_Declaration then
6166 Orig_Node := Original_Node (F);
6171 -- Find matching actual package, skipping over itypes and
6172 -- other entities generated when analyzing the formal. We
6173 -- know that if the instantiation is legal then there is
6174 -- a matching package for the formal.
6176 while Ekind (Act_Pkg) /= E_Package loop
6177 Act_Pkg := Next_Entity (Act_Pkg);
6181 Actual_Ent : Entity_Id := First_Entity (Act_Pkg);
6182 Formal_Node : Node_Id;
6183 Formal_Ent : Entity_Id;
6185 Gen_Decl : constant Node_Id :=
6186 Unit_Declaration_Node
6187 (Entity (Name (Orig_Node)));
6189 Formals : constant List_Id :=
6190 Generic_Formal_Declarations (Gen_Decl);
6193 if Present (Formals) then
6194 Formal_Node := First_Non_Pragma (Formals);
6196 Formal_Node := Empty;
6199 while Present (Actual_Ent)
6200 and then Present (Formal_Node)
6201 and then Actual_Ent /= First_Private_Entity (Act_Ent)
6203 -- ??? Are the following calls also needed here:
6205 -- Set_Is_Hidden (Actual_Ent, False);
6206 -- Set_Is_Potentially_Use_Visible
6207 -- (Actual_Ent, In_Use (Act_Ent));
6209 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6210 if Present (Formal_Ent) then
6211 Set_Instance_Of (Formal_Ent, Actual_Ent);
6213 Next_Non_Pragma (Formal_Node);
6215 Next_Entity (Actual_Ent);
6219 return Defining_Identifier (Orig_Node);
6221 when N_Use_Package_Clause =>
6224 when N_Use_Type_Clause =>
6227 -- We return Empty for all other encountered forms of
6228 -- declarations because there are some cases of nonformal
6229 -- sorts of declaration that can show up (e.g., when array
6230 -- formals are present). Since it's not clear what kinds
6231 -- can appear among the formals, we won't raise failure here.
6239 --------------------
6240 -- Is_Instance_Of --
6241 --------------------
6243 function Is_Instance_Of
6244 (Act_Spec : Entity_Id;
6245 Gen_Anc : Entity_Id)
6248 Gen_Par : Entity_Id := Generic_Parent (Act_Spec);
6251 if No (Gen_Par) then
6254 -- Simplest case: the generic parent of the actual is the formal.
6256 elsif Gen_Par = Gen_Anc then
6259 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
6262 -- The actual may be obtained through several instantiations. Its
6263 -- scope must itself be an instance of a generic declared in the
6264 -- same scope as the formal. Any other case is detected above.
6266 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
6270 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
6278 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
6283 Set_Instance_Of (Form, Act);
6285 -- Traverse formal and actual package to map the corresponding
6286 -- entities. We skip over internal entities that may be generated
6287 -- during semantic analysis, and find the matching entities by
6288 -- name, given that they must appear in the same order.
6290 E1 := First_Entity (Form);
6291 E2 := First_Entity (Act);
6293 and then E1 /= First_Private_Entity (Form)
6295 if not Is_Internal (E1)
6296 and then not Is_Class_Wide_Type (E1)
6297 and then Present (Parent (E1))
6300 and then Chars (E2) /= Chars (E1)
6308 Set_Instance_Of (E1, E2);
6311 and then Is_Tagged_Type (E2)
6314 (Class_Wide_Type (E1), Class_Wide_Type (E2));
6317 if Ekind (E1) = E_Package
6318 and then No (Renamed_Object (E1))
6320 Map_Entities (E1, E2);
6329 -- Start of processing for Instantiate_Formal_Package
6334 if not Is_Entity_Name (Actual)
6335 or else Ekind (Entity (Actual)) /= E_Package
6338 ("expect package instance to instantiate formal", Actual);
6339 Abandon_Instantiation (Actual);
6340 raise Program_Error;
6343 Actual_Pack := Entity (Actual);
6344 Set_Is_Instantiated (Actual_Pack);
6346 -- The actual may be a renamed package, or an outer generic
6347 -- formal package whose instantiation is converted into a renaming.
6349 if Present (Renamed_Object (Actual_Pack)) then
6350 Actual_Pack := Renamed_Object (Actual_Pack);
6353 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
6354 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
6355 Formal_Pack := Defining_Identifier (Analyzed_Formal);
6358 Generic_Parent (Specification (Analyzed_Formal));
6360 Defining_Unit_Name (Specification (Analyzed_Formal));
6363 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
6364 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
6366 Parent_Spec := Parent (Actual_Pack);
6369 if Gen_Parent = Any_Id then
6371 ("previous error in declaration of formal package", Actual);
6372 Abandon_Instantiation (Actual);
6375 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
6381 ("actual parameter must be instance of&", Actual, Gen_Parent);
6382 Abandon_Instantiation (Actual);
6385 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
6386 Map_Entities (Formal_Pack, Actual_Pack);
6389 Make_Package_Renaming_Declaration (Loc,
6390 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
6391 Name => New_Reference_To (Actual_Pack, Loc));
6393 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
6394 Defining_Identifier (Formal));
6395 Decls := New_List (Nod);
6397 -- If the formal F has a box, then the generic declarations are
6398 -- visible in the generic G. In an instance of G, the corresponding
6399 -- entities in the actual for F (which are the actuals for the
6400 -- instantiation of the generic that F denotes) must also be made
6401 -- visible for analysis of the current instance. On exit from the
6402 -- current instance, those entities are made private again. If the
6403 -- actual is currently in use, these entities are also use-visible.
6405 -- The loop through the actual entities also steps through the
6406 -- formal entities and enters associations from formals to
6407 -- actuals into the renaming map. This is necessary to properly
6408 -- handle checking of actual parameter associations for later
6409 -- formals that depend on actuals declared in the formal package.
6411 if Box_Present (Formal) then
6413 Gen_Decl : constant Node_Id :=
6414 Unit_Declaration_Node (Gen_Parent);
6415 Formals : constant List_Id :=
6416 Generic_Formal_Declarations (Gen_Decl);
6417 Actual_Ent : Entity_Id;
6418 Formal_Node : Node_Id;
6419 Formal_Ent : Entity_Id;
6422 if Present (Formals) then
6423 Formal_Node := First_Non_Pragma (Formals);
6425 Formal_Node := Empty;
6428 Actual_Ent := First_Entity (Actual_Pack);
6430 while Present (Actual_Ent)
6431 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6433 Set_Is_Hidden (Actual_Ent, False);
6434 Set_Is_Potentially_Use_Visible
6435 (Actual_Ent, In_Use (Actual_Pack));
6437 if Present (Formal_Node) then
6438 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6440 if Present (Formal_Ent) then
6441 Find_Matching_Actual (Formal_Node, Actual_Ent);
6442 Set_Instance_Of (Formal_Ent, Actual_Ent);
6445 Next_Non_Pragma (Formal_Node);
6448 -- No further formals to match.
6456 -- If the formal is not declared with a box, reanalyze it as
6457 -- an instantiation, to verify the matching rules of 12.7. The
6458 -- actual checks are performed after the generic associations
6463 I_Pack : constant Entity_Id :=
6464 Make_Defining_Identifier (Sloc (Actual),
6465 Chars => New_Internal_Name ('P'));
6468 Set_Is_Internal (I_Pack);
6471 Make_Package_Instantiation (Sloc (Actual),
6472 Defining_Unit_Name => I_Pack,
6473 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6474 Generic_Associations =>
6475 Generic_Associations (Formal)));
6481 end Instantiate_Formal_Package;
6483 -----------------------------------
6484 -- Instantiate_Formal_Subprogram --
6485 -----------------------------------
6487 function Instantiate_Formal_Subprogram
6490 Analyzed_Formal : Node_Id)
6493 Loc : Source_Ptr := Sloc (Instantiation_Node);
6494 Formal_Sub : constant Entity_Id :=
6495 Defining_Unit_Name (Specification (Formal));
6496 Analyzed_S : constant Entity_Id :=
6497 Defining_Unit_Name (Specification (Analyzed_Formal));
6498 Decl_Node : Node_Id;
6502 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6503 -- If the generic is a child unit, the parent has been installed
6504 -- on the scope stack, but a default subprogram cannot resolve to
6505 -- something on the parent because that parent is not really part
6506 -- of the visible context (it is there to resolve explicit local
6507 -- entities). If the default has resolved in this way, we remove
6508 -- the entity from immediate visibility and analyze the node again
6509 -- to emit an error message or find another visible candidate.
6511 procedure Valid_Actual_Subprogram (Act : Node_Id);
6512 -- Perform legality check and raise exception on failure.
6514 -----------------------
6515 -- From_Parent_Scope --
6516 -----------------------
6518 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6519 Gen_Scope : Node_Id := Scope (Analyzed_S);
6522 while Present (Gen_Scope)
6523 and then Is_Child_Unit (Gen_Scope)
6525 if Scope (Subp) = Scope (Gen_Scope) then
6529 Gen_Scope := Scope (Gen_Scope);
6533 end From_Parent_Scope;
6535 -----------------------------
6536 -- Valid_Actual_Subprogram --
6537 -----------------------------
6539 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6540 Act_E : Entity_Id := Empty;
6543 if Is_Entity_Name (Act) then
6544 Act_E := Entity (Act);
6545 elsif Nkind (Act) = N_Selected_Component
6546 and then Is_Entity_Name (Selector_Name (Act))
6548 Act_E := Entity (Selector_Name (Act));
6551 if (Present (Act_E) and then Is_Overloadable (Act_E))
6552 or else Nkind (Act) = N_Attribute_Reference
6553 or else Nkind (Act) = N_Indexed_Component
6554 or else Nkind (Act) = N_Character_Literal
6555 or else Nkind (Act) = N_Explicit_Dereference
6561 ("expect subprogram or entry name in instantiation of&",
6562 Instantiation_Node, Formal_Sub);
6563 Abandon_Instantiation (Instantiation_Node);
6565 end Valid_Actual_Subprogram;
6567 -- Start of processing for Instantiate_Formal_Subprogram
6570 New_Spec := New_Copy_Tree (Specification (Formal));
6572 -- Create new entity for the actual (New_Copy_Tree does not).
6574 Set_Defining_Unit_Name
6575 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6577 -- Find entity of actual. If the actual is an attribute reference, it
6578 -- cannot be resolved here (its formal is missing) but is handled
6579 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6580 -- fully resolved subsequently, when the renaming declaration for the
6581 -- formal is analyzed. If it is an explicit dereference, resolve the
6582 -- prefix but not the actual itself, to prevent interpretation as a
6585 if Present (Actual) then
6586 Loc := Sloc (Actual);
6587 Set_Sloc (New_Spec, Loc);
6589 if Nkind (Actual) = N_Operator_Symbol then
6590 Find_Direct_Name (Actual);
6592 elsif Nkind (Actual) = N_Explicit_Dereference then
6593 Analyze (Prefix (Actual));
6595 elsif Nkind (Actual) /= N_Attribute_Reference then
6599 Valid_Actual_Subprogram (Actual);
6602 elsif Present (Default_Name (Formal)) then
6603 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6604 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6605 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6606 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6607 and then Present (Entity (Default_Name (Formal)))
6609 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6611 Nam := New_Copy (Default_Name (Formal));
6612 Set_Sloc (Nam, Loc);
6615 elsif Box_Present (Formal) then
6617 -- Actual is resolved at the point of instantiation. Create
6618 -- an identifier or operator with the same name as the formal.
6620 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6621 Nam := Make_Operator_Symbol (Loc,
6622 Chars => Chars (Formal_Sub),
6623 Strval => No_String);
6625 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6629 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
6631 ("missing actual&", Instantiation_Node, Formal_Sub);
6633 ("\in instantiation of & declared#",
6634 Instantiation_Node, Scope (Analyzed_S));
6635 Abandon_Instantiation (Instantiation_Node);
6639 Make_Subprogram_Renaming_Declaration (Loc,
6640 Specification => New_Spec,
6643 -- Gather possible interpretations for the actual before analyzing the
6644 -- instance. If overloaded, it will be resolved when analyzing the
6645 -- renaming declaration.
6647 if Box_Present (Formal)
6648 and then No (Actual)
6652 if Is_Child_Unit (Scope (Analyzed_S))
6653 and then Present (Entity (Nam))
6655 if not Is_Overloaded (Nam) then
6657 if From_Parent_Scope (Entity (Nam)) then
6658 Set_Is_Immediately_Visible (Entity (Nam), False);
6659 Set_Entity (Nam, Empty);
6660 Set_Etype (Nam, Empty);
6664 Set_Is_Immediately_Visible (Entity (Nam));
6673 Get_First_Interp (Nam, I, It);
6675 while Present (It.Nam) loop
6676 if From_Parent_Scope (It.Nam) then
6680 Get_Next_Interp (I, It);
6687 -- The generic instantiation freezes the actual. This can only be
6688 -- done once the actual is resolved, in the analysis of the renaming
6689 -- declaration. To indicate that must be done, we set the corresponding
6690 -- spec of the node to point to the formal subprogram entity.
6692 Set_Corresponding_Spec (Decl_Node, Analyzed_S);
6694 -- We cannot analyze the renaming declaration, and thus find the
6695 -- actual, until the all the actuals are assembled in the instance.
6696 -- For subsequent checks of other actuals, indicate the node that
6697 -- will hold the instance of this formal.
6699 Set_Instance_Of (Analyzed_S, Nam);
6701 if Nkind (Actual) = N_Selected_Component
6702 and then Is_Task_Type (Etype (Prefix (Actual)))
6703 and then not Is_Frozen (Etype (Prefix (Actual)))
6705 -- The renaming declaration will create a body, which must appear
6706 -- outside of the instantiation, We move the renaming declaration
6707 -- out of the instance, and create an additional renaming inside,
6708 -- to prevent freezing anomalies.
6711 Anon_Id : constant Entity_Id :=
6712 Make_Defining_Identifier
6713 (Loc, New_Internal_Name ('E'));
6715 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6716 Insert_Before (Instantiation_Node, Decl_Node);
6717 Analyze (Decl_Node);
6719 -- Now create renaming within the instance
6722 Make_Subprogram_Renaming_Declaration (Loc,
6723 Specification => New_Copy_Tree (New_Spec),
6724 Name => New_Occurrence_Of (Anon_Id, Loc));
6726 Set_Defining_Unit_Name (Specification (Decl_Node),
6727 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6732 end Instantiate_Formal_Subprogram;
6734 ------------------------
6735 -- Instantiate_Object --
6736 ------------------------
6738 function Instantiate_Object
6741 Analyzed_Formal : Node_Id)
6744 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6745 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6746 Loc : constant Source_Ptr := Sloc (Actual);
6747 Act_Assoc : constant Node_Id := Parent (Actual);
6748 Orig_Ftyp : constant Entity_Id :=
6749 Etype (Defining_Identifier (Analyzed_Formal));
6750 List : constant List_Id := New_List;
6752 Decl_Node : Node_Id;
6753 Subt_Decl : Node_Id := Empty;
6756 -- Sloc for error message on missing actual.
6757 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
6759 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6760 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6763 Set_Parent (List, Parent (Actual));
6767 if Out_Present (Formal) then
6769 -- An IN OUT generic actual must be a name. The instantiation is
6770 -- a renaming declaration. The actual is the name being renamed.
6771 -- We use the actual directly, rather than a copy, because it is not
6772 -- used further in the list of actuals, and because a copy or a use
6773 -- of relocate_node is incorrect if the instance is nested within
6774 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6775 -- field links the declaration to the generic association.
6780 Instantiation_Node, Formal_Id);
6782 ("\in instantiation of & declared#",
6784 Scope (Defining_Identifier (Analyzed_Formal)));
6785 Abandon_Instantiation (Instantiation_Node);
6789 Make_Object_Renaming_Declaration (Loc,
6790 Defining_Identifier => New_Copy (Formal_Id),
6791 Subtype_Mark => New_Copy_Tree (Type_Id),
6794 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6796 -- The analysis of the actual may produce insert_action nodes, so
6797 -- the declaration must have a context in which to attach them.
6799 Append (Decl_Node, List);
6802 -- This check is performed here because Analyze_Object_Renaming
6803 -- will not check it when Comes_From_Source is False. Note
6804 -- though that the check for the actual being the name of an
6805 -- object will be performed in Analyze_Object_Renaming.
6807 if Is_Object_Reference (Actual)
6808 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6811 ("illegal discriminant-dependent component for in out parameter",
6815 -- The actual has to be resolved in order to check that it is
6816 -- a variable (due to cases such as F(1), where F returns
6817 -- access to an array, and for overloaded prefixes).
6820 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6822 if Is_Private_Type (Ftyp)
6823 and then not Is_Private_Type (Etype (Actual))
6824 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6825 or else Base_Type (Etype (Actual)) = Ftyp)
6827 -- If the actual has the type of the full view of the formal,
6828 -- or else a non-private subtype of the formal, then
6829 -- the visibility of the formal type has changed. Add to the
6830 -- actuals a subtype declaration that will force the exchange
6831 -- of views in the body of the instance as well.
6834 Make_Subtype_Declaration (Loc,
6835 Defining_Identifier =>
6836 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6837 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6839 Prepend (Subt_Decl, List);
6841 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6842 Exchange_Declarations (Ftyp);
6845 Resolve (Actual, Ftyp);
6847 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6849 ("actual for& must be a variable", Actual, Formal_Id);
6851 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6853 "type of actual does not match type of&", Actual, Formal_Id);
6857 Note_Possible_Modification (Actual);
6859 -- Check for instantiation of atomic/volatile actual for
6860 -- non-atomic/volatile formal (RM C.6 (12)).
6862 if Is_Atomic_Object (Actual)
6863 and then not Is_Atomic (Orig_Ftyp)
6866 ("cannot instantiate non-atomic formal object " &
6867 "with atomic actual", Actual);
6869 elsif Is_Volatile_Object (Actual)
6870 and then not Is_Volatile (Orig_Ftyp)
6873 ("cannot instantiate non-volatile formal object " &
6874 "with volatile actual", Actual);
6880 -- The instantiation of a generic formal in-parameter
6881 -- is a constant declaration. The actual is the expression for
6882 -- that declaration.
6884 if Present (Actual) then
6886 Decl_Node := Make_Object_Declaration (Loc,
6887 Defining_Identifier => New_Copy (Formal_Id),
6888 Constant_Present => True,
6889 Object_Definition => New_Copy_Tree (Type_Id),
6890 Expression => Actual);
6892 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6894 -- A generic formal object of a tagged type is defined
6895 -- to be aliased so the new constant must also be treated
6899 (Etype (Defining_Identifier (Analyzed_Formal)))
6901 Set_Aliased_Present (Decl_Node);
6904 Append (Decl_Node, List);
6906 -- No need to repeat (pre-)analysis of some expression nodes
6907 -- already handled in Pre_Analyze_Actuals.
6909 if Nkind (Actual) /= N_Allocator then
6914 Typ : constant Entity_Id :=
6916 (Etype (Defining_Identifier (Analyzed_Formal)));
6919 Freeze_Before (Instantiation_Node, Typ);
6921 -- If the actual is an aggregate, perform name resolution
6922 -- on its components (the analysis of an aggregate does not
6923 -- do it) to capture local names that may be hidden if the
6924 -- generic is a child unit.
6926 if Nkind (Actual) = N_Aggregate then
6927 Pre_Analyze_And_Resolve (Actual, Typ);
6931 elsif Present (Expression (Formal)) then
6933 -- Use default to construct declaration.
6936 Make_Object_Declaration (Sloc (Formal),
6937 Defining_Identifier => New_Copy (Formal_Id),
6938 Constant_Present => True,
6939 Object_Definition => New_Copy (Type_Id),
6940 Expression => New_Copy_Tree (Expression (Formal)));
6942 Append (Decl_Node, List);
6943 Set_Analyzed (Expression (Decl_Node), False);
6948 Instantiation_Node, Formal_Id);
6949 Error_Msg_NE ("\in instantiation of & declared#",
6951 Scope (Defining_Identifier (Analyzed_Formal)));
6954 (Etype (Defining_Identifier (Analyzed_Formal)))
6956 -- Create dummy constant declaration so that instance can
6957 -- be analyzed, to minimize cascaded visibility errors.
6960 Make_Object_Declaration (Loc,
6961 Defining_Identifier => New_Copy (Formal_Id),
6962 Constant_Present => True,
6963 Object_Definition => New_Copy (Type_Id),
6965 Make_Attribute_Reference (Sloc (Formal_Id),
6966 Attribute_Name => Name_First,
6967 Prefix => New_Copy (Type_Id)));
6969 Append (Decl_Node, List);
6972 Abandon_Instantiation (Instantiation_Node);
6979 end Instantiate_Object;
6981 ------------------------------
6982 -- Instantiate_Package_Body --
6983 ------------------------------
6985 procedure Instantiate_Package_Body
6986 (Body_Info : Pending_Body_Info;
6987 Inlined_Body : Boolean := False)
6989 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6990 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6991 Loc : constant Source_Ptr := Sloc (Inst_Node);
6993 Gen_Id : constant Node_Id := Name (Inst_Node);
6994 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6995 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6996 Act_Spec : constant Node_Id := Specification (Act_Decl);
6997 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6999 Act_Body_Name : Node_Id;
7001 Gen_Body_Id : Node_Id;
7003 Act_Body_Id : Entity_Id;
7005 Parent_Installed : Boolean := False;
7006 Save_Style_Check : constant Boolean := Style_Check;
7009 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7011 -- The instance body may already have been processed, as the parent
7012 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7014 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
7018 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7020 if No (Gen_Body_Id) then
7021 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7022 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7025 -- Establish global variable for sloc adjustment and for error
7028 Instantiation_Node := Inst_Node;
7030 if Present (Gen_Body_Id) then
7031 Save_Env (Gen_Unit, Act_Decl_Id);
7032 Style_Check := False;
7033 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7035 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7037 Create_Instantiation_Source
7038 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
7042 (Original_Node (Gen_Body), Empty, Instantiating => True);
7044 -- Build new name (possibly qualified) for body declaration
7046 Act_Body_Id := New_Copy (Act_Decl_Id);
7048 -- Some attributes of the spec entity are not inherited by the
7051 Set_Handler_Records (Act_Body_Id, No_List);
7053 if Nkind (Defining_Unit_Name (Act_Spec)) =
7054 N_Defining_Program_Unit_Name
7057 Make_Defining_Program_Unit_Name (Loc,
7058 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
7059 Defining_Identifier => Act_Body_Id);
7061 Act_Body_Name := Act_Body_Id;
7064 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
7066 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
7067 Check_Generic_Actuals (Act_Decl_Id, False);
7069 -- If it is a child unit, make the parent instance (which is an
7070 -- instance of the parent of the generic) visible. The parent
7071 -- instance is the prefix of the name of the generic unit.
7073 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7074 and then Nkind (Gen_Id) = N_Expanded_Name
7076 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7077 Parent_Installed := True;
7079 elsif Is_Child_Unit (Gen_Unit) then
7080 Install_Parent (Scope (Gen_Unit), In_Body => True);
7081 Parent_Installed := True;
7084 -- If the instantiation is a library unit, and this is the main
7085 -- unit, then build the resulting compilation unit nodes for the
7086 -- instance. If this is a compilation unit but it is not the main
7087 -- unit, then it is the body of a unit in the context, that is being
7088 -- compiled because it is encloses some inlined unit or another
7089 -- generic unit being instantiated. In that case, this body is not
7090 -- part of the current compilation, and is not attached to the tree,
7091 -- but its parent must be set for analysis.
7093 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7095 -- Replace instance node with body of instance, and create
7096 -- new node for corresponding instance declaration.
7098 Build_Instance_Compilation_Unit_Nodes
7099 (Inst_Node, Act_Body, Act_Decl);
7100 Analyze (Inst_Node);
7102 if Parent (Inst_Node) = Cunit (Main_Unit) then
7104 -- If the instance is a child unit itself, then set the
7105 -- scope of the expanded body to be the parent of the
7106 -- instantiation (ensuring that the fully qualified name
7107 -- will be generated for the elaboration subprogram).
7109 if Nkind (Defining_Unit_Name (Act_Spec)) =
7110 N_Defining_Program_Unit_Name
7113 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
7117 -- Case where instantiation is not a library unit
7120 -- If this is an early instantiation, i.e. appears textually
7121 -- before the corresponding body and must be elaborated first,
7122 -- indicate that the body instance is to be delayed.
7124 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
7126 -- Now analyze the body. We turn off all checks if this is
7127 -- an internal unit, since there is no reason to have checks
7128 -- on for any predefined run-time library code. All such
7129 -- code is designed to be compiled with checks off.
7131 -- Note that we do NOT apply this criterion to children of
7132 -- GNAT (or on VMS, children of DEC). The latter units must
7133 -- suppress checks explicitly if this is needed.
7135 if Is_Predefined_File_Name
7136 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
7138 Analyze (Act_Body, Suppress => All_Checks);
7144 if not Generic_Separately_Compiled (Gen_Unit) then
7145 Inherit_Context (Gen_Body, Inst_Node);
7148 -- Remove the parent instances if they have been placed on the
7149 -- scope stack to compile the body.
7151 if Parent_Installed then
7152 Remove_Parent (In_Body => True);
7155 Restore_Private_Views (Act_Decl_Id);
7157 -- Remove the current unit from visibility if this is an instance
7158 -- that is not elaborated on the fly for inlining purposes.
7160 if not Inlined_Body then
7161 Set_Is_Immediately_Visible (Act_Decl_Id, False);
7165 Style_Check := Save_Style_Check;
7167 -- If we have no body, and the unit requires a body, then complain.
7168 -- This complaint is suppressed if we have detected other errors
7169 -- (since a common reason for missing the body is that it had errors).
7171 elsif Unit_Requires_Body (Gen_Unit) then
7172 if Serious_Errors_Detected = 0 then
7174 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
7176 -- Don't attempt to perform any cleanup actions if some other
7177 -- error was aready detected, since this can cause blowups.
7183 -- Case of package that does not need a body
7186 -- If the instantiation of the declaration is a library unit,
7187 -- rewrite the original package instantiation as a package
7188 -- declaration in the compilation unit node.
7190 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7191 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
7192 Rewrite (Inst_Node, Act_Decl);
7194 -- Generate elaboration entity, in case spec has elaboration
7195 -- code. This cannot be done when the instance is analyzed,
7196 -- because it is not known yet whether the body exists.
7198 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
7199 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
7201 -- If the instantiation is not a library unit, then append the
7202 -- declaration to the list of implicitly generated entities.
7203 -- unless it is already a list member which means that it was
7204 -- already processed
7206 elsif not Is_List_Member (Act_Decl) then
7207 Mark_Rewrite_Insertion (Act_Decl);
7208 Insert_Before (Inst_Node, Act_Decl);
7212 Expander_Mode_Restore;
7213 end Instantiate_Package_Body;
7215 ---------------------------------
7216 -- Instantiate_Subprogram_Body --
7217 ---------------------------------
7219 procedure Instantiate_Subprogram_Body
7220 (Body_Info : Pending_Body_Info)
7222 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7223 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7224 Loc : constant Source_Ptr := Sloc (Inst_Node);
7225 Gen_Id : constant Node_Id := Name (Inst_Node);
7226 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7227 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7228 Anon_Id : constant Entity_Id :=
7229 Defining_Unit_Name (Specification (Act_Decl));
7230 Pack_Id : constant Entity_Id :=
7231 Defining_Unit_Name (Parent (Act_Decl));
7234 Gen_Body_Id : Node_Id;
7236 Act_Body_Id : Entity_Id;
7237 Pack_Body : Node_Id;
7238 Prev_Formal : Entity_Id;
7240 Unit_Renaming : Node_Id;
7242 Parent_Installed : Boolean := False;
7243 Save_Style_Check : constant Boolean := Style_Check;
7246 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7248 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7250 if No (Gen_Body_Id) then
7251 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7252 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7255 Instantiation_Node := Inst_Node;
7257 if Present (Gen_Body_Id) then
7258 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7260 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
7262 -- Either body is not present, or context is non-expanding, as
7263 -- when compiling a subunit. Mark the instance as completed.
7265 Set_Has_Completion (Anon_Id);
7269 Save_Env (Gen_Unit, Anon_Id);
7270 Style_Check := False;
7271 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7272 Create_Instantiation_Source
7280 (Original_Node (Gen_Body), Empty, Instantiating => True);
7281 Act_Body_Id := Defining_Entity (Act_Body);
7282 Set_Chars (Act_Body_Id, Chars (Anon_Id));
7283 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
7284 Set_Corresponding_Spec (Act_Body, Anon_Id);
7285 Set_Has_Completion (Anon_Id);
7286 Check_Generic_Actuals (Pack_Id, False);
7288 -- If it is a child unit, make the parent instance (which is an
7289 -- instance of the parent of the generic) visible. The parent
7290 -- instance is the prefix of the name of the generic unit.
7292 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7293 and then Nkind (Gen_Id) = N_Expanded_Name
7295 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7296 Parent_Installed := True;
7298 elsif Is_Child_Unit (Gen_Unit) then
7299 Install_Parent (Scope (Gen_Unit), In_Body => True);
7300 Parent_Installed := True;
7303 -- Inside its body, a reference to the generic unit is a reference
7304 -- to the instance. The corresponding renaming is the first
7305 -- declaration in the body.
7308 Make_Subprogram_Renaming_Declaration (Loc,
7311 Specification (Original_Node (Gen_Body)),
7313 Instantiating => True),
7314 Name => New_Occurrence_Of (Anon_Id, Loc));
7316 -- If there is a formal subprogram with the same name as the
7317 -- unit itself, do not add this renaming declaration. This is
7318 -- a temporary fix for one ACVC test. ???
7320 Prev_Formal := First_Entity (Pack_Id);
7321 while Present (Prev_Formal) loop
7322 if Chars (Prev_Formal) = Chars (Gen_Unit)
7323 and then Is_Overloadable (Prev_Formal)
7328 Next_Entity (Prev_Formal);
7331 if Present (Prev_Formal) then
7332 Decls := New_List (Act_Body);
7334 Decls := New_List (Unit_Renaming, Act_Body);
7337 -- The subprogram body is placed in the body of a dummy package
7338 -- body, whose spec contains the subprogram declaration as well
7339 -- as the renaming declarations for the generic parameters.
7341 Pack_Body := Make_Package_Body (Loc,
7342 Defining_Unit_Name => New_Copy (Pack_Id),
7343 Declarations => Decls);
7345 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7347 -- If the instantiation is a library unit, then build resulting
7348 -- compilation unit nodes for the instance. The declaration of
7349 -- the enclosing package is the grandparent of the subprogram
7350 -- declaration. First replace the instantiation node as the unit
7351 -- of the corresponding compilation.
7353 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7354 if Parent (Inst_Node) = Cunit (Main_Unit) then
7355 Set_Unit (Parent (Inst_Node), Inst_Node);
7356 Build_Instance_Compilation_Unit_Nodes
7357 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
7358 Analyze (Inst_Node);
7360 Set_Parent (Pack_Body, Parent (Inst_Node));
7361 Analyze (Pack_Body);
7365 Insert_Before (Inst_Node, Pack_Body);
7366 Mark_Rewrite_Insertion (Pack_Body);
7367 Analyze (Pack_Body);
7369 if Expander_Active then
7370 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
7374 if not Generic_Separately_Compiled (Gen_Unit) then
7375 Inherit_Context (Gen_Body, Inst_Node);
7378 Restore_Private_Views (Pack_Id, False);
7380 if Parent_Installed then
7381 Remove_Parent (In_Body => True);
7385 Style_Check := Save_Style_Check;
7387 -- Body not found. Error was emitted already. If there were no
7388 -- previous errors, this may be an instance whose scope is a premature
7389 -- instance. In that case we must insure that the (legal) program does
7390 -- raise program error if executed. We generate a subprogram body for
7391 -- this purpose. See DEC ac30vso.
7393 elsif Serious_Errors_Detected = 0
7394 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
7396 if Ekind (Anon_Id) = E_Procedure then
7398 Make_Subprogram_Body (Loc,
7400 Make_Procedure_Specification (Loc,
7401 Defining_Unit_Name => New_Copy (Anon_Id),
7402 Parameter_Specifications =>
7404 (Parameter_Specifications (Parent (Anon_Id)))),
7406 Declarations => Empty_List,
7407 Handled_Statement_Sequence =>
7408 Make_Handled_Sequence_Of_Statements (Loc,
7411 Make_Raise_Program_Error (Loc,
7413 PE_Access_Before_Elaboration))));
7417 Make_Raise_Program_Error (Loc,
7418 Reason => PE_Access_Before_Elaboration);
7420 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
7421 Set_Analyzed (Ret_Expr);
7424 Make_Subprogram_Body (Loc,
7426 Make_Function_Specification (Loc,
7427 Defining_Unit_Name => New_Copy (Anon_Id),
7428 Parameter_Specifications =>
7430 (Parameter_Specifications (Parent (Anon_Id))),
7432 New_Occurrence_Of (Etype (Anon_Id), Loc)),
7434 Declarations => Empty_List,
7435 Handled_Statement_Sequence =>
7436 Make_Handled_Sequence_Of_Statements (Loc,
7438 New_List (Make_Return_Statement (Loc, Ret_Expr))));
7441 Pack_Body := Make_Package_Body (Loc,
7442 Defining_Unit_Name => New_Copy (Pack_Id),
7443 Declarations => New_List (Act_Body));
7445 Insert_After (Inst_Node, Pack_Body);
7446 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7447 Analyze (Pack_Body);
7450 Expander_Mode_Restore;
7451 end Instantiate_Subprogram_Body;
7453 ----------------------
7454 -- Instantiate_Type --
7455 ----------------------
7457 function Instantiate_Type
7460 Analyzed_Formal : Node_Id;
7461 Actual_Decls : List_Id)
7464 Loc : constant Source_Ptr := Sloc (Actual);
7465 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
7466 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
7467 Ancestor : Entity_Id := Empty;
7468 Def : constant Node_Id := Formal_Type_Definition (Formal);
7470 Decl_Node : Node_Id;
7472 procedure Validate_Array_Type_Instance;
7473 procedure Validate_Access_Subprogram_Instance;
7474 procedure Validate_Access_Type_Instance;
7475 procedure Validate_Derived_Type_Instance;
7476 procedure Validate_Private_Type_Instance;
7477 -- These procedures perform validation tests for the named case
7479 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
7480 -- Check that base types are the same and that the subtypes match
7481 -- statically. Used in several of the above.
7483 --------------------
7484 -- Subtypes_Match --
7485 --------------------
7487 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7488 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7491 return (Base_Type (T) = Base_Type (Act_T)
7492 -- why is the and then commented out here???
7493 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7494 and then Subtypes_Statically_Match (T, Act_T))
7496 or else (Is_Class_Wide_Type (Gen_T)
7497 and then Is_Class_Wide_Type (Act_T)
7500 Get_Instance_Of (Root_Type (Gen_T)),
7501 Root_Type (Act_T)));
7504 -----------------------------------------
7505 -- Validate_Access_Subprogram_Instance --
7506 -----------------------------------------
7508 procedure Validate_Access_Subprogram_Instance is
7510 if not Is_Access_Type (Act_T)
7511 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7514 ("expect access type in instantiation of &", Actual, Gen_T);
7515 Abandon_Instantiation (Actual);
7518 Check_Mode_Conformant
7519 (Designated_Type (Act_T),
7520 Designated_Type (A_Gen_T),
7524 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7525 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7527 ("protected access type not allowed for formal &",
7531 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7533 ("expect protected access type for formal &",
7536 end Validate_Access_Subprogram_Instance;
7538 -----------------------------------
7539 -- Validate_Access_Type_Instance --
7540 -----------------------------------
7542 procedure Validate_Access_Type_Instance is
7543 Desig_Type : constant Entity_Id :=
7545 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7548 if not Is_Access_Type (Act_T) then
7550 ("expect access type in instantiation of &", Actual, Gen_T);
7551 Abandon_Instantiation (Actual);
7554 if Is_Access_Constant (A_Gen_T) then
7555 if not Is_Access_Constant (Act_T) then
7557 ("actual type must be access-to-constant type", Actual);
7558 Abandon_Instantiation (Actual);
7561 if Is_Access_Constant (Act_T) then
7563 ("actual type must be access-to-variable type", Actual);
7564 Abandon_Instantiation (Actual);
7566 elsif Ekind (A_Gen_T) = E_General_Access_Type
7567 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7569 Error_Msg_N ("actual must be general access type!", Actual);
7570 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7571 Abandon_Instantiation (Actual);
7575 -- The designated subtypes, that is to say the subtypes introduced
7576 -- by an access type declaration (and not by a subtype declaration)
7579 if not Subtypes_Match
7580 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7583 ("designated type of actual does not match that of formal &",
7585 Abandon_Instantiation (Actual);
7587 elsif Is_Access_Type (Designated_Type (Act_T))
7588 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7590 Is_Constrained (Designated_Type (Desig_Type))
7593 ("designated type of actual does not match that of formal &",
7595 Abandon_Instantiation (Actual);
7597 end Validate_Access_Type_Instance;
7599 ----------------------------------
7600 -- Validate_Array_Type_Instance --
7601 ----------------------------------
7603 procedure Validate_Array_Type_Instance is
7608 function Formal_Dimensions return Int;
7609 -- Count number of dimensions in array type formal
7611 function Formal_Dimensions return Int is
7616 if Nkind (Def) = N_Constrained_Array_Definition then
7617 Index := First (Discrete_Subtype_Definitions (Def));
7619 Index := First (Subtype_Marks (Def));
7622 while Present (Index) loop
7628 end Formal_Dimensions;
7630 -- Start of processing for Validate_Array_Type_Instance
7633 if not Is_Array_Type (Act_T) then
7635 ("expect array type in instantiation of &", Actual, Gen_T);
7636 Abandon_Instantiation (Actual);
7638 elsif Nkind (Def) = N_Constrained_Array_Definition then
7639 if not (Is_Constrained (Act_T)) then
7641 ("expect constrained array in instantiation of &",
7643 Abandon_Instantiation (Actual);
7647 if Is_Constrained (Act_T) then
7649 ("expect unconstrained array in instantiation of &",
7651 Abandon_Instantiation (Actual);
7655 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7657 ("dimensions of actual do not match formal &", Actual, Gen_T);
7658 Abandon_Instantiation (Actual);
7661 I1 := First_Index (A_Gen_T);
7662 I2 := First_Index (Act_T);
7663 for J in 1 .. Formal_Dimensions loop
7665 -- If the indices of the actual were given by a subtype_mark,
7666 -- the index was transformed into a range attribute. Retrieve
7667 -- the original type mark for checking.
7669 if Is_Entity_Name (Original_Node (I2)) then
7670 T2 := Entity (Original_Node (I2));
7675 if not Subtypes_Match
7676 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7679 ("index types of actual do not match those of formal &",
7681 Abandon_Instantiation (Actual);
7688 if not Subtypes_Match (
7689 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7690 Component_Type (Act_T))
7693 ("component subtype of actual does not match that of formal &",
7695 Abandon_Instantiation (Actual);
7698 if Has_Aliased_Components (A_Gen_T)
7699 and then not Has_Aliased_Components (Act_T)
7702 ("actual must have aliased components to match formal type &",
7706 end Validate_Array_Type_Instance;
7708 ------------------------------------
7709 -- Validate_Derived_Type_Instance --
7710 ------------------------------------
7712 procedure Validate_Derived_Type_Instance is
7713 Actual_Discr : Entity_Id;
7714 Ancestor_Discr : Entity_Id;
7717 -- If the parent type in the generic declaration is itself
7718 -- a previous formal type, then it is local to the generic
7719 -- and absent from the analyzed generic definition. In that
7720 -- case the ancestor is the instance of the formal (which must
7721 -- have been instantiated previously), unless the ancestor is
7722 -- itself a formal derived type. In this latter case (which is the
7723 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
7724 -- formals is the ancestor of its parent. Otherwise, the analyzed
7725 -- generic carries the parent type. If the parent type is defined
7726 -- in a previous formal package, then the scope of that formal
7727 -- package is that of the generic type itself, and it has already
7728 -- been mapped into the corresponding type in the actual package.
7730 -- Common case: parent type defined outside of the generic
7732 if Is_Entity_Name (Subtype_Mark (Def))
7733 and then Present (Entity (Subtype_Mark (Def)))
7735 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7737 -- Check whether parent is defined in a previous formal package
7740 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7743 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7745 -- The type may be a local derivation, or a type extension of
7746 -- a previous formal, or of a formal of a parent package.
7748 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
7750 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
7752 -- Check whether the parent is another derived formal type
7753 -- in the same generic unit.
7755 if Etype (A_Gen_T) /= A_Gen_T
7756 and then Is_Generic_Type (Etype (A_Gen_T))
7757 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
7758 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
7760 -- Locate ancestor of parent from the subtype declaration
7761 -- created for the actual.
7767 Decl := First (Actual_Decls);
7769 while (Present (Decl)) loop
7770 if Nkind (Decl) = N_Subtype_Declaration
7771 and then Chars (Defining_Identifier (Decl)) =
7772 Chars (Etype (A_Gen_T))
7774 Ancestor := Generic_Parent_Type (Decl);
7782 pragma Assert (Present (Ancestor));
7786 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7790 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7793 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7795 ("expect type derived from & in instantiation",
7796 Actual, First_Subtype (Ancestor));
7797 Abandon_Instantiation (Actual);
7800 -- Perform atomic/volatile checks (RM C.6(12))
7802 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7804 ("cannot have atomic actual type for non-atomic formal type",
7807 elsif Is_Volatile (Act_T)
7808 and then not Is_Volatile (Ancestor)
7809 and then Is_By_Reference_Type (Ancestor)
7812 ("cannot have volatile actual type for non-volatile formal type",
7816 -- It should not be necessary to check for unknown discriminants
7817 -- on Formal, but for some reason Has_Unknown_Discriminants is
7818 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7819 -- returns False. This needs fixing. ???
7821 if not Is_Indefinite_Subtype (A_Gen_T)
7822 and then not Unknown_Discriminants_Present (Formal)
7823 and then Is_Indefinite_Subtype (Act_T)
7826 ("actual subtype must be constrained", Actual);
7827 Abandon_Instantiation (Actual);
7830 if not Unknown_Discriminants_Present (Formal) then
7831 if Is_Constrained (Ancestor) then
7832 if not Is_Constrained (Act_T) then
7834 ("actual subtype must be constrained", Actual);
7835 Abandon_Instantiation (Actual);
7838 -- Ancestor is unconstrained
7840 elsif Is_Constrained (Act_T) then
7841 if Ekind (Ancestor) = E_Access_Type
7842 or else Is_Composite_Type (Ancestor)
7845 ("actual subtype must be unconstrained", Actual);
7846 Abandon_Instantiation (Actual);
7849 -- A class-wide type is only allowed if the formal has
7850 -- unknown discriminants.
7852 elsif Is_Class_Wide_Type (Act_T)
7853 and then not Has_Unknown_Discriminants (Ancestor)
7856 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7857 Abandon_Instantiation (Actual);
7859 -- Otherwise, the formal and actual shall have the same
7860 -- number of discriminants and each discriminant of the
7861 -- actual must correspond to a discriminant of the formal.
7863 elsif Has_Discriminants (Act_T)
7864 and then Has_Discriminants (Ancestor)
7866 Actual_Discr := First_Discriminant (Act_T);
7867 Ancestor_Discr := First_Discriminant (Ancestor);
7868 while Present (Actual_Discr)
7869 and then Present (Ancestor_Discr)
7871 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7872 not Present (Corresponding_Discriminant (Actual_Discr))
7875 ("discriminant & does not correspond " &
7876 "to ancestor discriminant", Actual, Actual_Discr);
7877 Abandon_Instantiation (Actual);
7880 Next_Discriminant (Actual_Discr);
7881 Next_Discriminant (Ancestor_Discr);
7884 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7886 ("actual for & must have same number of discriminants",
7888 Abandon_Instantiation (Actual);
7891 -- This case should be caught by the earlier check for
7892 -- for constrainedness, but the check here is added for
7895 elsif Has_Discriminants (Act_T) then
7897 ("actual for & must not have discriminants", Actual, Gen_T);
7898 Abandon_Instantiation (Actual);
7900 elsif Has_Discriminants (Ancestor) then
7902 ("actual for & must have known discriminants", Actual, Gen_T);
7903 Abandon_Instantiation (Actual);
7906 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7908 ("constraint on actual is incompatible with formal", Actual);
7909 Abandon_Instantiation (Actual);
7912 end Validate_Derived_Type_Instance;
7914 ------------------------------------
7915 -- Validate_Private_Type_Instance --
7916 ------------------------------------
7918 procedure Validate_Private_Type_Instance is
7919 Formal_Discr : Entity_Id;
7920 Actual_Discr : Entity_Id;
7921 Formal_Subt : Entity_Id;
7924 if Is_Limited_Type (Act_T)
7925 and then not Is_Limited_Type (A_Gen_T)
7928 ("actual for non-limited & cannot be a limited type", Actual,
7930 Explain_Limited_Type (Act_T, Actual);
7931 Abandon_Instantiation (Actual);
7933 elsif Is_Indefinite_Subtype (Act_T)
7934 and then not Is_Indefinite_Subtype (A_Gen_T)
7938 ("actual for & must be a definite subtype", Actual, Gen_T);
7940 elsif not Is_Tagged_Type (Act_T)
7941 and then Is_Tagged_Type (A_Gen_T)
7944 ("actual for & must be a tagged type", Actual, Gen_T);
7946 elsif Has_Discriminants (A_Gen_T) then
7947 if not Has_Discriminants (Act_T) then
7949 ("actual for & must have discriminants", Actual, Gen_T);
7950 Abandon_Instantiation (Actual);
7952 elsif Is_Constrained (Act_T) then
7954 ("actual for & must be unconstrained", Actual, Gen_T);
7955 Abandon_Instantiation (Actual);
7958 Formal_Discr := First_Discriminant (A_Gen_T);
7959 Actual_Discr := First_Discriminant (Act_T);
7960 while Formal_Discr /= Empty loop
7961 if Actual_Discr = Empty then
7963 ("discriminants on actual do not match formal",
7965 Abandon_Instantiation (Actual);
7968 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7970 -- access discriminants match if designated types do.
7972 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7973 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7974 = E_Anonymous_Access_Type
7975 and then Get_Instance_Of (
7976 Designated_Type (Base_Type (Formal_Subt)))
7977 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7981 elsif Base_Type (Formal_Subt) /=
7982 Base_Type (Etype (Actual_Discr))
7985 ("types of actual discriminants must match formal",
7987 Abandon_Instantiation (Actual);
7989 elsif not Subtypes_Statically_Match
7990 (Formal_Subt, Etype (Actual_Discr))
7994 ("subtypes of actual discriminants must match formal",
7996 Abandon_Instantiation (Actual);
7999 Next_Discriminant (Formal_Discr);
8000 Next_Discriminant (Actual_Discr);
8003 if Actual_Discr /= Empty then
8005 ("discriminants on actual do not match formal",
8007 Abandon_Instantiation (Actual);
8014 end Validate_Private_Type_Instance;
8016 -- Start of processing for Instantiate_Type
8019 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
8020 Error_Msg_N ("duplicate instantiation of generic type", Actual);
8023 elsif not Is_Entity_Name (Actual)
8024 or else not Is_Type (Entity (Actual))
8027 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
8028 Abandon_Instantiation (Actual);
8031 Act_T := Entity (Actual);
8033 -- Deal with fixed/floating restrictions
8035 if Is_Floating_Point_Type (Act_T) then
8036 Check_Restriction (No_Floating_Point, Actual);
8037 elsif Is_Fixed_Point_Type (Act_T) then
8038 Check_Restriction (No_Fixed_Point, Actual);
8041 -- Deal with error of using incomplete type as generic actual
8043 if Ekind (Act_T) = E_Incomplete_Type then
8044 if No (Underlying_Type (Act_T)) then
8045 Error_Msg_N ("premature use of incomplete type", Actual);
8046 Abandon_Instantiation (Actual);
8048 Act_T := Full_View (Act_T);
8049 Set_Entity (Actual, Act_T);
8051 if Has_Private_Component (Act_T) then
8053 ("premature use of type with private component", Actual);
8057 -- Deal with error of premature use of private type as generic actual
8059 elsif Is_Private_Type (Act_T)
8060 and then Is_Private_Type (Base_Type (Act_T))
8061 and then not Is_Generic_Type (Act_T)
8062 and then not Is_Derived_Type (Act_T)
8063 and then No (Full_View (Root_Type (Act_T)))
8065 Error_Msg_N ("premature use of private type", Actual);
8067 elsif Has_Private_Component (Act_T) then
8069 ("premature use of type with private component", Actual);
8072 Set_Instance_Of (A_Gen_T, Act_T);
8074 -- If the type is generic, the class-wide type may also be used
8076 if Is_Tagged_Type (A_Gen_T)
8077 and then Is_Tagged_Type (Act_T)
8078 and then not Is_Class_Wide_Type (A_Gen_T)
8080 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
8081 Class_Wide_Type (Act_T));
8084 if not Is_Abstract (A_Gen_T)
8085 and then Is_Abstract (Act_T)
8088 ("actual of non-abstract formal cannot be abstract", Actual);
8091 if Is_Scalar_Type (Gen_T) then
8092 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
8097 when N_Formal_Private_Type_Definition =>
8098 Validate_Private_Type_Instance;
8100 when N_Formal_Derived_Type_Definition =>
8101 Validate_Derived_Type_Instance;
8103 when N_Formal_Discrete_Type_Definition =>
8104 if not Is_Discrete_Type (Act_T) then
8106 ("expect discrete type in instantiation of&", Actual, Gen_T);
8107 Abandon_Instantiation (Actual);
8110 when N_Formal_Signed_Integer_Type_Definition =>
8111 if not Is_Signed_Integer_Type (Act_T) then
8113 ("expect signed integer type in instantiation of&",
8115 Abandon_Instantiation (Actual);
8118 when N_Formal_Modular_Type_Definition =>
8119 if not Is_Modular_Integer_Type (Act_T) then
8121 ("expect modular type in instantiation of &", Actual, Gen_T);
8122 Abandon_Instantiation (Actual);
8125 when N_Formal_Floating_Point_Definition =>
8126 if not Is_Floating_Point_Type (Act_T) then
8128 ("expect float type in instantiation of &", Actual, Gen_T);
8129 Abandon_Instantiation (Actual);
8132 when N_Formal_Ordinary_Fixed_Point_Definition =>
8133 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
8135 ("expect ordinary fixed point type in instantiation of &",
8137 Abandon_Instantiation (Actual);
8140 when N_Formal_Decimal_Fixed_Point_Definition =>
8141 if not Is_Decimal_Fixed_Point_Type (Act_T) then
8143 ("expect decimal type in instantiation of &",
8145 Abandon_Instantiation (Actual);
8148 when N_Array_Type_Definition =>
8149 Validate_Array_Type_Instance;
8151 when N_Access_To_Object_Definition =>
8152 Validate_Access_Type_Instance;
8154 when N_Access_Function_Definition |
8155 N_Access_Procedure_Definition =>
8156 Validate_Access_Subprogram_Instance;
8159 raise Program_Error;
8164 Make_Subtype_Declaration (Loc,
8165 Defining_Identifier => New_Copy (Gen_T),
8166 Subtype_Indication => New_Reference_To (Act_T, Loc));
8168 if Is_Private_Type (Act_T) then
8169 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8171 elsif Is_Access_Type (Act_T)
8172 and then Is_Private_Type (Designated_Type (Act_T))
8174 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8177 -- Flag actual derived types so their elaboration produces the
8178 -- appropriate renamings for the primitive operations of the ancestor.
8179 -- Flag actual for formal private types as well, to determine whether
8180 -- operations in the private part may override inherited operations.
8182 if Nkind (Def) = N_Formal_Derived_Type_Definition
8183 or else Nkind (Def) = N_Formal_Private_Type_Definition
8185 Set_Generic_Parent_Type (Decl_Node, Ancestor);
8189 end Instantiate_Type;
8191 ---------------------
8192 -- Is_In_Main_Unit --
8193 ---------------------
8195 function Is_In_Main_Unit (N : Node_Id) return Boolean is
8196 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
8198 Current_Unit : Node_Id;
8201 if Unum = Main_Unit then
8204 -- If the current unit is a subunit then it is either the main unit
8205 -- or is being compiled as part of the main unit.
8207 elsif Nkind (N) = N_Compilation_Unit then
8208 return Nkind (Unit (N)) = N_Subunit;
8211 Current_Unit := Parent (N);
8212 while Present (Current_Unit)
8213 and then Nkind (Current_Unit) /= N_Compilation_Unit
8215 Current_Unit := Parent (Current_Unit);
8218 -- The instantiation node is in the main unit, or else the current
8219 -- node (perhaps as the result of nested instantiations) is in the
8220 -- main unit, or in the declaration of the main unit, which in this
8221 -- last case must be a body.
8223 return Unum = Main_Unit
8224 or else Current_Unit = Cunit (Main_Unit)
8225 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
8226 or else (Present (Library_Unit (Current_Unit))
8227 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
8228 end Is_In_Main_Unit;
8230 ----------------------------
8231 -- Load_Parent_Of_Generic --
8232 ----------------------------
8234 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
8235 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
8236 Save_Style_Check : constant Boolean := Style_Check;
8237 True_Parent : Node_Id;
8238 Inst_Node : Node_Id;
8242 if not In_Same_Source_Unit (N, Spec)
8243 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
8244 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
8245 and then not Is_In_Main_Unit (Spec))
8247 -- Find body of parent of spec, and analyze it. A special case
8248 -- arises when the parent is an instantiation, that is to say when
8249 -- we are currently instantiating a nested generic. In that case,
8250 -- there is no separate file for the body of the enclosing instance.
8251 -- Instead, the enclosing body must be instantiated as if it were
8252 -- a pending instantiation, in order to produce the body for the
8253 -- nested generic we require now. Note that in that case the
8254 -- generic may be defined in a package body, the instance defined
8255 -- in the same package body, and the original enclosing body may not
8256 -- be in the main unit.
8258 True_Parent := Parent (Spec);
8261 while Present (True_Parent)
8262 and then Nkind (True_Parent) /= N_Compilation_Unit
8264 if Nkind (True_Parent) = N_Package_Declaration
8266 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
8268 -- Parent is a compilation unit that is an instantiation.
8269 -- Instantiation node has been replaced with package decl.
8271 Inst_Node := Original_Node (True_Parent);
8274 elsif Nkind (True_Parent) = N_Package_Declaration
8275 and then Present (Generic_Parent (Specification (True_Parent)))
8276 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
8278 -- Parent is an instantiation within another specification.
8279 -- Declaration for instance has been inserted before original
8280 -- instantiation node. A direct link would be preferable?
8282 Inst_Node := Next (True_Parent);
8284 while Present (Inst_Node)
8285 and then Nkind (Inst_Node) /= N_Package_Instantiation
8290 -- If the instance appears within a generic, and the generic
8291 -- unit is defined within a formal package of the enclosing
8292 -- generic, there is no generic body available, and none
8293 -- needed. A more precise test should be used ???
8295 if No (Inst_Node) then
8301 True_Parent := Parent (True_Parent);
8305 -- Case where we are currently instantiating a nested generic
8307 if Present (Inst_Node) then
8308 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
8310 -- Instantiation node and declaration of instantiated package
8311 -- were exchanged when only the declaration was needed.
8312 -- Restore instantiation node before proceeding with body.
8314 Set_Unit (Parent (True_Parent), Inst_Node);
8317 -- Now complete instantiation of enclosing body, if it appears
8318 -- in some other unit. If it appears in the current unit, the
8319 -- body will have been instantiated already.
8321 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
8323 -- We need to determine the expander mode to instantiate
8324 -- the enclosing body. Because the generic body we need
8325 -- may use global entities declared in the enclosing package
8326 -- (including aggregates) it is in general necessary to
8327 -- compile this body with expansion enabled. The exception
8328 -- is if we are within a generic package, in which case
8329 -- the usual generic rule applies.
8332 Exp_Status : Boolean := True;
8336 -- Loop through scopes looking for generic package
8338 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
8339 while Present (Scop)
8340 and then Scop /= Standard_Standard
8342 if Ekind (Scop) = E_Generic_Package then
8343 Exp_Status := False;
8347 Scop := Scope (Scop);
8350 Instantiate_Package_Body
8351 (Pending_Body_Info'(
8352 Inst_Node, True_Parent, Exp_Status,
8353 Get_Code_Unit (Sloc (Inst_Node))));
8357 -- Case where we are not instantiating a nested generic
8360 Opt.Style_Check := False;
8361 Expander_Mode_Save_And_Set (True);
8362 Load_Needed_Body (Comp_Unit, OK);
8363 Opt.Style_Check := Save_Style_Check;
8364 Expander_Mode_Restore;
8367 and then Unit_Requires_Body (Defining_Entity (Spec))
8370 Bname : constant Unit_Name_Type :=
8371 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8374 Error_Msg_Unit_1 := Bname;
8375 Error_Msg_N ("this instantiation requires$!", N);
8377 Get_File_Name (Bname, Subunit => False);
8378 Error_Msg_N ("\but file{ was not found!", N);
8379 raise Unrecoverable_Error;
8385 -- If loading the parent of the generic caused an instantiation
8386 -- circularity, we abandon compilation at this point, because
8387 -- otherwise in some cases we get into trouble with infinite
8388 -- recursions after this point.
8390 if Circularity_Detected then
8391 raise Unrecoverable_Error;
8393 end Load_Parent_Of_Generic;
8395 -----------------------
8396 -- Move_Freeze_Nodes --
8397 -----------------------
8399 procedure Move_Freeze_Nodes
8400 (Out_Of : Entity_Id;
8405 Next_Decl : Node_Id;
8406 Next_Node : Node_Id := After;
8409 function Is_Outer_Type (T : Entity_Id) return Boolean;
8410 -- Check whether entity is declared in a scope external to that
8411 -- of the generic unit.
8417 function Is_Outer_Type (T : Entity_Id) return Boolean is
8418 Scop : Entity_Id := Scope (T);
8421 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8425 while Scop /= Standard_Standard loop
8427 if Scop = Out_Of then
8430 Scop := Scope (Scop);
8438 -- Start of processing for Move_Freeze_Nodes
8445 -- First remove the freeze nodes that may appear before all other
8449 while Present (Decl)
8450 and then Nkind (Decl) = N_Freeze_Entity
8451 and then Is_Outer_Type (Entity (Decl))
8453 Decl := Remove_Head (L);
8454 Insert_After (Next_Node, Decl);
8455 Set_Analyzed (Decl, False);
8460 -- Next scan the list of declarations and remove each freeze node that
8461 -- appears ahead of the current node.
8463 while Present (Decl) loop
8464 while Present (Next (Decl))
8465 and then Nkind (Next (Decl)) = N_Freeze_Entity
8466 and then Is_Outer_Type (Entity (Next (Decl)))
8468 Next_Decl := Remove_Next (Decl);
8469 Insert_After (Next_Node, Next_Decl);
8470 Set_Analyzed (Next_Decl, False);
8471 Next_Node := Next_Decl;
8474 -- If the declaration is a nested package or concurrent type, then
8475 -- recurse. Nested generic packages will have been processed from the
8478 if Nkind (Decl) = N_Package_Declaration then
8479 Spec := Specification (Decl);
8481 elsif Nkind (Decl) = N_Task_Type_Declaration then
8482 Spec := Task_Definition (Decl);
8484 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8485 Spec := Protected_Definition (Decl);
8491 if Present (Spec) then
8492 Move_Freeze_Nodes (Out_Of, Next_Node,
8493 Visible_Declarations (Spec));
8494 Move_Freeze_Nodes (Out_Of, Next_Node,
8495 Private_Declarations (Spec));
8500 end Move_Freeze_Nodes;
8506 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8508 return Generic_Renamings.Table (E).Next_In_HTable;
8511 ------------------------
8512 -- Preanalyze_Actuals --
8513 ------------------------
8515 procedure Pre_Analyze_Actuals (N : Node_Id) is
8518 Errs : constant Int := Serious_Errors_Detected;
8521 Assoc := First (Generic_Associations (N));
8523 while Present (Assoc) loop
8524 Act := Explicit_Generic_Actual_Parameter (Assoc);
8526 -- Within a nested instantiation, a defaulted actual is an
8527 -- empty association, so nothing to analyze. If the actual for
8528 -- a subprogram is an attribute, analyze prefix only, because
8529 -- actual is not a complete attribute reference.
8531 -- If actual is an allocator, analyze expression only. The full
8532 -- analysis can generate code, and if the instance is a compilation
8533 -- unit we have to wait until the package instance is installed to
8534 -- have a proper place to insert this code.
8536 -- String literals may be operators, but at this point we do not
8537 -- know whether the actual is a formal subprogram or a string.
8542 elsif Nkind (Act) = N_Attribute_Reference then
8543 Analyze (Prefix (Act));
8545 elsif Nkind (Act) = N_Explicit_Dereference then
8546 Analyze (Prefix (Act));
8548 elsif Nkind (Act) = N_Allocator then
8550 Expr : constant Node_Id := Expression (Act);
8553 if Nkind (Expr) = N_Subtype_Indication then
8554 Analyze (Subtype_Mark (Expr));
8555 Analyze_List (Constraints (Constraint (Expr)));
8561 elsif Nkind (Act) /= N_Operator_Symbol then
8565 if Errs /= Serious_Errors_Detected then
8566 Abandon_Instantiation (Act);
8571 end Pre_Analyze_Actuals;
8577 procedure Remove_Parent (In_Body : Boolean := False) is
8578 S : Entity_Id := Current_Scope;
8584 -- After child instantiation is complete, remove from scope stack
8585 -- the extra copy of the current scope, and then remove parent
8591 while Current_Scope /= S loop
8593 End_Package_Scope (Current_Scope);
8595 if In_Open_Scopes (P) then
8596 E := First_Entity (P);
8598 while Present (E) loop
8599 Set_Is_Immediately_Visible (E, True);
8603 if Is_Generic_Instance (Current_Scope)
8604 and then P /= Current_Scope
8606 -- We are within an instance of some sibling. Retain
8607 -- visibility of parent, for proper subsequent cleanup.
8609 Set_In_Private_Part (P);
8612 elsif not In_Open_Scopes (Scope (P)) then
8613 Set_Is_Immediately_Visible (P, False);
8617 -- Reset visibility of entities in the enclosing scope.
8619 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8620 Hidden := First_Elmt (Hidden_Entities);
8622 while Present (Hidden) loop
8623 Set_Is_Immediately_Visible (Node (Hidden), True);
8628 -- Each body is analyzed separately, and there is no context
8629 -- that needs preserving from one body instance to the next,
8630 -- so remove all parent scopes that have been installed.
8632 while Present (S) loop
8633 End_Package_Scope (S);
8634 Set_Is_Immediately_Visible (S, False);
8636 exit when S = Standard_Standard;
8646 procedure Restore_Env is
8647 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8650 Ada_83 := Saved.Ada_83;
8652 if No (Current_Instantiated_Parent.Act_Id) then
8654 -- Restore environment after subprogram inlining
8656 Restore_Private_Views (Empty);
8659 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8660 Exchanged_Views := Saved.Exchanged_Views;
8661 Hidden_Entities := Saved.Hidden_Entities;
8662 Current_Sem_Unit := Saved.Current_Sem_Unit;
8664 Instance_Envs.Decrement_Last;
8667 ---------------------------
8668 -- Restore_Private_Views --
8669 ---------------------------
8671 procedure Restore_Private_Views
8672 (Pack_Id : Entity_Id;
8673 Is_Package : Boolean := True)
8682 M := First_Elmt (Exchanged_Views);
8683 while Present (M) loop
8686 -- Subtypes of types whose views have been exchanged, and that
8687 -- are defined within the instance, were not on the list of
8688 -- Private_Dependents on entry to the instance, so they have to
8689 -- be exchanged explicitly now, in order to remain consistent with
8690 -- the view of the parent type.
8692 if Ekind (Typ) = E_Private_Type
8693 or else Ekind (Typ) = E_Limited_Private_Type
8694 or else Ekind (Typ) = E_Record_Type_With_Private
8696 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8698 while Present (Dep_Elmt) loop
8699 Dep_Typ := Node (Dep_Elmt);
8701 if Scope (Dep_Typ) = Pack_Id
8702 and then Present (Full_View (Dep_Typ))
8704 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8705 Exchange_Declarations (Dep_Typ);
8708 Next_Elmt (Dep_Elmt);
8712 Exchange_Declarations (Node (M));
8716 if No (Pack_Id) then
8720 -- Make the generic formal parameters private, and make the formal
8721 -- types into subtypes of the actuals again.
8723 E := First_Entity (Pack_Id);
8725 while Present (E) loop
8726 Set_Is_Hidden (E, True);
8729 and then Nkind (Parent (E)) = N_Subtype_Declaration
8731 Set_Is_Generic_Actual_Type (E, False);
8733 -- An unusual case of aliasing: the actual may also be directly
8734 -- visible in the generic, and be private there, while it is
8735 -- fully visible in the context of the instance. The internal
8736 -- subtype is private in the instance, but has full visibility
8737 -- like its parent in the enclosing scope. This enforces the
8738 -- invariant that the privacy status of all private dependents of
8739 -- a type coincide with that of the parent type. This can only
8740 -- happen when a generic child unit is instantiated within a
8743 if Is_Private_Type (E)
8744 and then not Is_Private_Type (Etype (E))
8746 Exchange_Declarations (E);
8749 elsif Ekind (E) = E_Package then
8751 -- The end of the renaming list is the renaming of the generic
8752 -- package itself. If the instance is a subprogram, all entities
8753 -- in the corresponding package are renamings. If this entity is
8754 -- a formal package, make its own formals private as well. The
8755 -- actual in this case is itself the renaming of an instantation.
8756 -- If the entity is not a package renaming, it is the entity
8757 -- created to validate formal package actuals: ignore.
8759 -- If the actual is itself a formal package for the enclosing
8760 -- generic, or the actual for such a formal package, it remains
8761 -- visible after the current instance, and therefore nothing
8762 -- needs to be done either, except to keep it accessible.
8765 and then Renamed_Object (E) = Pack_Id
8769 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8772 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8773 Set_Is_Hidden (E, False);
8777 Act_P : constant Entity_Id := Renamed_Object (E);
8781 Id := First_Entity (Act_P);
8783 and then Id /= First_Private_Entity (Act_P)
8785 Set_Is_Hidden (Id, True);
8786 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8787 exit when Ekind (Id) = E_Package
8788 and then Renamed_Object (Id) = Act_P;
8799 end Restore_Private_Views;
8806 (Gen_Unit : Entity_Id;
8807 Act_Unit : Entity_Id)
8811 Set_Instance_Env (Gen_Unit, Act_Unit);
8814 ----------------------------
8815 -- Save_Global_References --
8816 ----------------------------
8818 procedure Save_Global_References (N : Node_Id) is
8819 Gen_Scope : Entity_Id;
8823 function Is_Global (E : Entity_Id) return Boolean;
8824 -- Check whether entity is defined outside of generic unit.
8825 -- Examine the scope of an entity, and the scope of the scope,
8826 -- etc, until we find either Standard, in which case the entity
8827 -- is global, or the generic unit itself, which indicates that
8828 -- the entity is local. If the entity is the generic unit itself,
8829 -- as in the case of a recursive call, or the enclosing generic unit,
8830 -- if different from the current scope, then it is local as well,
8831 -- because it will be replaced at the point of instantiation. On
8832 -- the other hand, if it is a reference to a child unit of a common
8833 -- ancestor, which appears in an instantiation, it is global because
8834 -- it is used to denote a specific compilation unit at the time the
8835 -- instantiations will be analyzed.
8837 procedure Reset_Entity (N : Node_Id);
8838 -- Save semantic information on global entity, so that it is not
8839 -- resolved again at instantiation time.
8841 procedure Save_Entity_Descendants (N : Node_Id);
8842 -- Apply Save_Global_References to the two syntactic descendants of
8843 -- non-terminal nodes that carry an Associated_Node and are processed
8844 -- through Reset_Entity. Once the global entity (if any) has been
8845 -- captured together with its type, only two syntactic descendants
8846 -- need to be traversed to complete the processing of the tree rooted
8847 -- at N. This applies to Selected_Components, Expanded_Names, and to
8848 -- Operator nodes. N can also be a character literal, identifier, or
8849 -- operator symbol node, but the call has no effect in these cases.
8851 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8852 -- Default actuals in nested instances must be handled specially
8853 -- because there is no link to them from the original tree. When an
8854 -- actual subprogram is given by a default, we add an explicit generic
8855 -- association for it in the instantiation node. When we save the
8856 -- global references on the name of the instance, we recover the list
8857 -- of generic associations, and add an explicit one to the original
8858 -- generic tree, through which a global actual can be preserved.
8859 -- Similarly, if a child unit is instantiated within a sibling, in the
8860 -- context of the parent, we must preserve the identifier of the parent
8861 -- so that it can be properly resolved in a subsequent instantiation.
8863 procedure Save_Global_Descendant (D : Union_Id);
8864 -- Apply Save_Global_References recursively to the descendents of
8867 procedure Save_References (N : Node_Id);
8868 -- This is the recursive procedure that does the work, once the
8869 -- enclosing generic scope has been established.
8875 function Is_Global (E : Entity_Id) return Boolean is
8876 Se : Entity_Id := Scope (E);
8878 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8879 -- Determine whether the parent node of a reference to a child unit
8880 -- denotes an instantiation or a formal package, in which case the
8881 -- reference to the child unit is global, even if it appears within
8882 -- the current scope (e.g. when the instance appears within the body
8885 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8887 return (Nkind (Decl) in N_Generic_Instantiation
8889 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8890 end Is_Instance_Node;
8892 -- Start of processing for Is_Global
8895 if E = Gen_Scope then
8898 elsif E = Standard_Standard then
8901 elsif Is_Child_Unit (E)
8902 and then (Is_Instance_Node (Parent (N2))
8903 or else (Nkind (Parent (N2)) = N_Expanded_Name
8904 and then N2 = Selector_Name (Parent (N2))
8905 and then Is_Instance_Node (Parent (Parent (N2)))))
8910 while Se /= Gen_Scope loop
8911 if Se = Standard_Standard then
8926 procedure Reset_Entity (N : Node_Id) is
8928 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8929 -- The type of N2 is global to the generic unit. Save the
8930 -- type in the generic node.
8932 function Top_Ancestor (E : Entity_Id) return Entity_Id;
8933 -- Find the ultimate ancestor of the current unit. If it is
8934 -- not a generic unit, then the name of the current unit
8935 -- in the prefix of an expanded name must be replaced with
8936 -- its generic homonym to ensure that it will be properly
8937 -- resolved in an instance.
8939 ---------------------
8940 -- Set_Global_Type --
8941 ---------------------
8943 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8944 Typ : constant Entity_Id := Etype (N2);
8950 and then Has_Private_View (Entity (N))
8952 -- If the entity of N is not the associated node, this is
8953 -- a nested generic and it has an associated node as well,
8954 -- whose type is already the full view (see below). Indicate
8955 -- that the original node has a private view.
8957 Set_Has_Private_View (N);
8960 -- If not a private type, nothing else to do
8962 if not Is_Private_Type (Typ) then
8963 if Is_Array_Type (Typ)
8964 and then Is_Private_Type (Component_Type (Typ))
8966 Set_Has_Private_View (N);
8969 -- If it is a derivation of a private type in a context where
8970 -- no full view is needed, nothing to do either.
8972 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8975 -- Otherwise mark the type for flipping and use the full_view
8979 Set_Has_Private_View (N);
8981 if Present (Full_View (Typ)) then
8982 Set_Etype (N2, Full_View (Typ));
8985 end Set_Global_Type;
8991 function Top_Ancestor (E : Entity_Id) return Entity_Id is
8992 Par : Entity_Id := E;
8995 while Is_Child_Unit (Par) loop
9002 -- Start of processing for Reset_Entity
9005 N2 := Get_Associated_Node (N);
9009 if Is_Global (E) then
9010 Set_Global_Type (N, N2);
9012 elsif Nkind (N) = N_Op_Concat
9013 and then Is_Generic_Type (Etype (N2))
9015 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9016 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9017 and then Is_Intrinsic_Subprogram (E)
9022 -- Entity is local. Mark generic node as unresolved.
9023 -- Note that now it does not have an entity.
9025 Set_Associated_Node (N, Empty);
9026 Set_Etype (N, Empty);
9029 if (Nkind (Parent (N)) = N_Package_Instantiation
9030 or else Nkind (Parent (N)) = N_Function_Instantiation
9031 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9032 and then N = Name (Parent (N))
9034 Save_Global_Defaults (Parent (N), Parent (N2));
9037 elsif Nkind (Parent (N)) = N_Selected_Component
9038 and then Nkind (Parent (N2)) = N_Expanded_Name
9041 if Is_Global (Entity (Parent (N2))) then
9042 Change_Selected_Component_To_Expanded_Name (Parent (N));
9043 Set_Associated_Node (Parent (N), Parent (N2));
9044 Set_Global_Type (Parent (N), Parent (N2));
9045 Save_Entity_Descendants (N);
9047 -- If this is a reference to the current generic entity,
9048 -- replace by the name of the generic homonym of the current
9049 -- package. This is because in an instantiation Par.P.Q will
9050 -- not resolve to the name of the instance, whose enclosing
9051 -- scope is not necessarily Par. We use the generic homonym
9052 -- rather that the name of the generic itself, because it may
9053 -- be hidden by a local declaration.
9055 elsif In_Open_Scopes (Entity (Parent (N2)))
9057 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9059 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9060 Rewrite (Parent (N),
9061 Make_Identifier (Sloc (N),
9063 Chars (Generic_Homonym (Entity (Parent (N2))))));
9065 Rewrite (Parent (N),
9066 Make_Identifier (Sloc (N),
9067 Chars => Chars (Selector_Name (Parent (N2)))));
9071 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9072 or else Nkind (Parent (Parent (N)))
9073 = N_Function_Instantiation
9074 or else Nkind (Parent (Parent (N)))
9075 = N_Procedure_Instantiation)
9076 and then Parent (N) = Name (Parent (Parent (N)))
9078 Save_Global_Defaults
9079 (Parent (Parent (N)), Parent (Parent ((N2))));
9082 -- A selected component may denote a static constant that has
9083 -- been folded. Make the same replacement in original tree.
9085 elsif Nkind (Parent (N)) = N_Selected_Component
9086 and then (Nkind (Parent (N2)) = N_Integer_Literal
9087 or else Nkind (Parent (N2)) = N_Real_Literal)
9089 Rewrite (Parent (N),
9090 New_Copy (Parent (N2)));
9091 Set_Analyzed (Parent (N), False);
9093 -- A selected component may be transformed into a parameterless
9094 -- function call. If the called entity is global, rewrite the
9095 -- node appropriately, i.e. as an extended name for the global
9098 elsif Nkind (Parent (N)) = N_Selected_Component
9099 and then Nkind (Parent (N2)) = N_Function_Call
9100 and then Is_Global (Entity (Name (Parent (N2))))
9102 Change_Selected_Component_To_Expanded_Name (Parent (N));
9103 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9104 Set_Global_Type (Parent (N), Name (Parent (N2)));
9105 Save_Entity_Descendants (N);
9108 -- Entity is local. Reset in generic unit, so that node
9109 -- is resolved anew at the point of instantiation.
9111 Set_Associated_Node (N, Empty);
9112 Set_Etype (N, Empty);
9116 -----------------------------
9117 -- Save_Entity_Descendants --
9118 -----------------------------
9120 procedure Save_Entity_Descendants (N : Node_Id) is
9124 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9125 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9128 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9130 when N_Expanded_Name | N_Selected_Component =>
9131 Save_Global_Descendant (Union_Id (Prefix (N)));
9132 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9134 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9138 raise Program_Error;
9140 end Save_Entity_Descendants;
9142 --------------------------
9143 -- Save_Global_Defaults --
9144 --------------------------
9146 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9147 Loc : constant Source_Ptr := Sloc (N1);
9148 Assoc2 : constant List_Id := Generic_Associations (N2);
9149 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9159 Assoc1 := Generic_Associations (N1);
9161 if Present (Assoc1) then
9162 Act1 := First (Assoc1);
9165 Set_Generic_Associations (N1, New_List);
9166 Assoc1 := Generic_Associations (N1);
9169 if Present (Assoc2) then
9170 Act2 := First (Assoc2);
9175 while Present (Act1) and then Present (Act2) loop
9180 -- Find the associations added for default suprograms.
9182 if Present (Act2) then
9183 while Nkind (Act2) /= N_Generic_Association
9184 or else No (Entity (Selector_Name (Act2)))
9185 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9190 -- Add a similar association if the default is global. The
9191 -- renaming declaration for the actual has been analyzed, and
9192 -- its alias is the program it renames. Link the actual in the
9193 -- original generic tree with the node in the analyzed tree.
9195 while Present (Act2) loop
9196 Subp := Entity (Selector_Name (Act2));
9197 Def := Explicit_Generic_Actual_Parameter (Act2);
9199 -- Following test is defence against rubbish errors
9201 if No (Alias (Subp)) then
9205 -- Retrieve the resolved actual from the renaming declaration
9206 -- created for the instantiated formal.
9208 Actual := Entity (Name (Parent (Parent (Subp))));
9209 Set_Entity (Def, Actual);
9210 Set_Etype (Def, Etype (Actual));
9212 if Is_Global (Actual) then
9214 Make_Generic_Association (Loc,
9215 Selector_Name => New_Occurrence_Of (Subp, Loc),
9216 Explicit_Generic_Actual_Parameter =>
9217 New_Occurrence_Of (Actual, Loc));
9220 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9222 Append (Ndec, Assoc1);
9224 -- If there are other defaults, add a dummy association
9225 -- in case there are other defaulted formals with the same
9228 elsif Present (Next (Act2)) then
9230 Make_Generic_Association (Loc,
9231 Selector_Name => New_Occurrence_Of (Subp, Loc),
9232 Explicit_Generic_Actual_Parameter => Empty);
9234 Append (Ndec, Assoc1);
9241 if Nkind (Name (N1)) = N_Identifier
9242 and then Is_Child_Unit (Gen_Id)
9243 and then Is_Global (Gen_Id)
9244 and then Is_Generic_Unit (Scope (Gen_Id))
9245 and then In_Open_Scopes (Scope (Gen_Id))
9247 -- This is an instantiation of a child unit within a sibling,
9248 -- so that the generic parent is in scope. An eventual instance
9249 -- must occur within the scope of an instance of the parent.
9250 -- Make name in instance into an expanded name, to preserve the
9251 -- identifier of the parent, so it can be resolved subsequently.
9254 Make_Expanded_Name (Loc,
9255 Chars => Chars (Gen_Id),
9256 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9257 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9258 Set_Entity (Name (N2), Gen_Id);
9261 Make_Expanded_Name (Loc,
9262 Chars => Chars (Gen_Id),
9263 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9264 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9266 Set_Associated_Node (Name (N1), Name (N2));
9267 Set_Associated_Node (Prefix (Name (N1)), Empty);
9269 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9270 Set_Etype (Name (N1), Etype (Gen_Id));
9273 end Save_Global_Defaults;
9275 ----------------------------
9276 -- Save_Global_Descendant --
9277 ----------------------------
9279 procedure Save_Global_Descendant (D : Union_Id) is
9283 if D in Node_Range then
9284 if D = Union_Id (Empty) then
9287 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9288 Save_References (Node_Id (D));
9291 elsif D in List_Range then
9292 if D = Union_Id (No_List)
9293 or else Is_Empty_List (List_Id (D))
9298 N1 := First (List_Id (D));
9299 while Present (N1) loop
9300 Save_References (N1);
9305 -- Element list or other non-node field, nothing to do
9310 end Save_Global_Descendant;
9312 ---------------------
9313 -- Save_References --
9314 ---------------------
9316 -- This is the recursive procedure that does the work, once the
9317 -- enclosing generic scope has been established. We have to treat
9318 -- specially a number of node rewritings that are required by semantic
9319 -- processing and which change the kind of nodes in the generic copy:
9320 -- typically constant-folding, replacing an operator node by a string
9321 -- literal, or a selected component by an expanded name. In each of
9322 -- those cases, the transformation is propagated to the generic unit.
9324 procedure Save_References (N : Node_Id) is
9329 elsif Nkind (N) = N_Character_Literal
9330 or else Nkind (N) = N_Operator_Symbol
9332 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9335 elsif Nkind (N) = N_Operator_Symbol
9336 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9338 Change_Operator_Symbol_To_String_Literal (N);
9341 elsif Nkind (N) in N_Op then
9343 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9345 if Nkind (N) = N_Op_Concat then
9346 Set_Is_Component_Left_Opnd (N,
9347 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9349 Set_Is_Component_Right_Opnd (N,
9350 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9355 -- Node may be transformed into call to a user-defined operator
9357 N2 := Get_Associated_Node (N);
9359 if Nkind (N2) = N_Function_Call then
9360 E := Entity (Name (N2));
9363 and then Is_Global (E)
9365 Set_Etype (N, Etype (N2));
9367 Set_Associated_Node (N, Empty);
9368 Set_Etype (N, Empty);
9371 elsif Nkind (N2) = N_Integer_Literal
9372 or else Nkind (N2) = N_Real_Literal
9373 or else Nkind (N2) = N_String_Literal
9375 -- Operation was constant-folded, perform the same
9376 -- replacement in generic.
9378 Rewrite (N, New_Copy (N2));
9379 Set_Analyzed (N, False);
9381 elsif Nkind (N2) = N_Identifier
9382 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9384 -- Same if call was folded into a literal, but in this
9385 -- case retain the entity to avoid spurious ambiguities
9386 -- if id is overloaded at the point of instantiation or
9389 Rewrite (N, New_Copy (N2));
9390 Set_Associated_Node (N, N2);
9391 Set_Analyzed (N, False);
9395 -- Complete the check on operands, if node has not been
9398 if Nkind (N) in N_Op then
9399 Save_Entity_Descendants (N);
9402 elsif Nkind (N) = N_Identifier then
9403 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9405 -- If this is a discriminant reference, always save it.
9406 -- It is used in the instance to find the corresponding
9407 -- discriminant positionally rather than by name.
9409 Set_Original_Discriminant
9410 (N, Original_Discriminant (Get_Associated_Node (N)));
9414 N2 := Get_Associated_Node (N);
9416 if Nkind (N2) = N_Function_Call then
9417 E := Entity (Name (N2));
9419 -- Name resolves to a call to parameterless function.
9420 -- If original entity is global, mark node as resolved.
9423 and then Is_Global (E)
9425 Set_Etype (N, Etype (N2));
9427 Set_Associated_Node (N, Empty);
9428 Set_Etype (N, Empty);
9432 Nkind (N2) = N_Integer_Literal or else
9433 Nkind (N2) = N_Real_Literal or else
9434 Nkind (N2) = N_String_Literal
9436 -- Name resolves to named number that is constant-folded,
9437 -- or to string literal from concatenation.
9438 -- Perform the same replacement in generic.
9440 Rewrite (N, New_Copy (N2));
9441 Set_Analyzed (N, False);
9443 elsif Nkind (N2) = N_Explicit_Dereference then
9445 -- An identifier is rewritten as a dereference if it is
9446 -- the prefix in a selected component, and it denotes an
9447 -- access to a composite type, or a parameterless function
9448 -- call that returns an access type.
9450 -- Check whether corresponding entity in prefix is global.
9452 if Is_Entity_Name (Prefix (N2))
9453 and then Present (Entity (Prefix (N2)))
9454 and then Is_Global (Entity (Prefix (N2)))
9457 Make_Explicit_Dereference (Sloc (N),
9458 Prefix => Make_Identifier (Sloc (N),
9459 Chars => Chars (N))));
9460 Set_Associated_Node (Prefix (N), Prefix (N2));
9462 elsif Nkind (Prefix (N2)) = N_Function_Call
9463 and then Is_Global (Entity (Name (Prefix (N2))))
9466 Make_Explicit_Dereference (Sloc (N),
9467 Prefix => Make_Function_Call (Sloc (N),
9469 Make_Identifier (Sloc (N),
9470 Chars => Chars (N)))));
9473 (Name (Prefix (N)), Name (Prefix (N2)));
9476 Set_Associated_Node (N, Empty);
9477 Set_Etype (N, Empty);
9480 -- The subtype mark of a nominally unconstrained object
9481 -- is rewritten as a subtype indication using the bounds
9482 -- of the expression. Recover the original subtype mark.
9484 elsif Nkind (N2) = N_Subtype_Indication
9485 and then Is_Entity_Name (Original_Node (N2))
9487 Set_Associated_Node (N, Original_Node (N2));
9495 elsif Nkind (N) in N_Entity then
9500 use Atree.Unchecked_Access;
9501 -- This code section is part of implementing an untyped tree
9502 -- traversal, so it needs direct access to node fields.
9505 if Nkind (N) = N_Aggregate
9507 Nkind (N) = N_Extension_Aggregate
9509 N2 := Get_Associated_Node (N);
9512 or else No (Etype (N2))
9513 or else not Is_Global (Etype (N2))
9515 Set_Associated_Node (N, Empty);
9518 Save_Global_Descendant (Field1 (N));
9519 Save_Global_Descendant (Field2 (N));
9520 Save_Global_Descendant (Field3 (N));
9521 Save_Global_Descendant (Field5 (N));
9523 -- All other cases than aggregates
9526 Save_Global_Descendant (Field1 (N));
9527 Save_Global_Descendant (Field2 (N));
9528 Save_Global_Descendant (Field3 (N));
9529 Save_Global_Descendant (Field4 (N));
9530 Save_Global_Descendant (Field5 (N));
9534 end Save_References;
9536 -- Start of processing for Save_Global_References
9539 Gen_Scope := Current_Scope;
9541 -- If the generic unit is a child unit, references to entities in
9542 -- the parent are treated as local, because they will be resolved
9543 -- anew in the context of the instance of the parent.
9545 while Is_Child_Unit (Gen_Scope)
9546 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9548 Gen_Scope := Scope (Gen_Scope);
9551 Save_References (N);
9552 end Save_Global_References;
9554 --------------------------------------
9555 -- Set_Copied_Sloc_For_Inlined_Body --
9556 --------------------------------------
9558 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9560 Create_Instantiation_Source (N, E, True, S_Adjustment);
9561 end Set_Copied_Sloc_For_Inlined_Body;
9563 ---------------------
9564 -- Set_Instance_Of --
9565 ---------------------
9567 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9569 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9570 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9571 Generic_Renamings.Increment_Last;
9572 end Set_Instance_Of;
9574 --------------------
9575 -- Set_Next_Assoc --
9576 --------------------
9578 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9580 Generic_Renamings.Table (E).Next_In_HTable := Next;
9587 procedure Start_Generic is
9589 -- ??? I am sure more things could be factored out in this
9590 -- routine. Should probably be done at a later stage.
9592 Generic_Flags.Increment_Last;
9593 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9594 Inside_A_Generic := True;
9596 Expander_Mode_Save_And_Set (False);
9599 ----------------------
9600 -- Set_Instance_Env --
9601 ----------------------
9603 procedure Set_Instance_Env
9604 (Gen_Unit : Entity_Id;
9605 Act_Unit : Entity_Id)
9609 -- Regardless of the current mode, predefined units are analyzed in
9610 -- Ada95 mode, and Ada83 checks don't apply.
9612 if Is_Internal_File_Name
9613 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
9614 Renamings_Included => True) then
9618 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
9619 end Set_Instance_Env;
9625 procedure Switch_View (T : Entity_Id) is
9626 BT : constant Entity_Id := Base_Type (T);
9627 Priv_Elmt : Elmt_Id := No_Elmt;
9628 Priv_Sub : Entity_Id;
9631 -- T may be private but its base type may have been exchanged through
9632 -- some other occurrence, in which case there is nothing to switch.
9634 if not Is_Private_Type (BT) then
9638 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9640 if Present (Full_View (BT)) then
9641 Append_Elmt (Full_View (BT), Exchanged_Views);
9642 Exchange_Declarations (BT);
9645 while Present (Priv_Elmt) loop
9646 Priv_Sub := (Node (Priv_Elmt));
9648 -- We avoid flipping the subtype if the Etype of its full
9649 -- view is private because this would result in a malformed
9650 -- subtype. This occurs when the Etype of the subtype full
9651 -- view is the full view of the base type (and since the
9652 -- base types were just switched, the subtype is pointing
9653 -- to the wrong view). This is currently the case for
9654 -- tagged record types, access types (maybe more?) and
9655 -- needs to be resolved. ???
9657 if Present (Full_View (Priv_Sub))
9658 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
9660 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
9661 Exchange_Declarations (Priv_Sub);
9664 Next_Elmt (Priv_Elmt);
9668 -----------------------------
9669 -- Valid_Default_Attribute --
9670 -----------------------------
9672 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
9673 Attr_Id : constant Attribute_Id :=
9674 Get_Attribute_Id (Attribute_Name (Def));
9675 T : constant Entity_Id := Entity (Prefix (Def));
9676 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
9689 F := First_Formal (Nam);
9690 while Present (F) loop
9696 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
9697 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
9698 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
9699 Attribute_Unbiased_Rounding =>
9702 and then Is_Floating_Point_Type (T);
9704 when Attribute_Image | Attribute_Pred | Attribute_Succ |
9705 Attribute_Value | Attribute_Wide_Image |
9706 Attribute_Wide_Value =>
9707 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9709 when Attribute_Max | Attribute_Min =>
9710 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
9712 when Attribute_Input =>
9713 OK := (Is_Fun and then Num_F = 1);
9715 when Attribute_Output | Attribute_Read | Attribute_Write =>
9716 OK := (not Is_Fun and then Num_F = 2);
9723 Error_Msg_N ("attribute reference has wrong profile for subprogram",
9726 end Valid_Default_Attribute;
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