1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
11 -- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- GNAT was originally developed by the GNAT team at New York University. --
25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
27 ------------------------------------------------------------------------------
29 with Atree; use Atree;
30 with Einfo; use Einfo;
31 with Elists; use Elists;
32 with Errout; use Errout;
33 with Expander; use Expander;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
36 with Freeze; use Freeze;
38 with Inline; use Inline;
40 with Lib.Load; use Lib.Load;
41 with Lib.Xref; use Lib.Xref;
42 with Nlists; use Nlists;
43 with Nmake; use Nmake;
45 with Restrict; use Restrict;
46 with Rtsfind; use Rtsfind;
48 with Sem_Cat; use Sem_Cat;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Ch10; use Sem_Ch10;
54 with Sem_Ch13; use Sem_Ch13;
55 with Sem_Elab; use Sem_Elab;
56 with Sem_Elim; use Sem_Elim;
57 with Sem_Eval; use Sem_Eval;
58 with Sem_Res; use Sem_Res;
59 with Sem_Type; use Sem_Type;
60 with Sem_Util; use Sem_Util;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation (N : Node_Id);
245 pragma No_Return (Abandon_Instantiation);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T : in out Entity_Id;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part (N : Node_Id);
283 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
284 -- This needs comments ???
286 function Analyze_Associations
291 -- At instantiation time, build the list of associations between formals
292 -- and actuals. Each association becomes a renaming declaration for the
293 -- formal entity. F_Copy is the analyzed list of formals in the generic
294 -- copy. It is used to apply legality checks to the actuals. I_Node is the
295 -- instantiation node itself.
297 procedure Analyze_Subprogram_Instantiation
301 procedure Build_Instance_Compilation_Unit_Nodes
305 -- This procedure is used in the case where the generic instance of a
306 -- subprogram body or package body is a library unit. In this case, the
307 -- original library unit node for the generic instantiation must be
308 -- replaced by the resulting generic body, and a link made to a new
309 -- compilation unit node for the generic declaration. The argument N is
310 -- the original generic instantiation. Act_Body and Act_Decl are the body
311 -- and declaration of the instance (either package body and declaration
312 -- nodes or subprogram body and declaration nodes depending on the case).
313 -- On return, the node N has been rewritten with the actual body.
315 procedure Check_Formal_Packages (P_Id : Entity_Id);
316 -- Apply the following to all formal packages in generic associations.
318 procedure Check_Formal_Package_Instance
319 (Formal_Pack : Entity_Id;
320 Actual_Pack : Entity_Id);
321 -- Verify that the actuals of the actual instance match the actuals of
322 -- the template for a formal package that is not declared with a box.
324 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id);
325 -- If the generic is a local entity and the corresponding body has not
326 -- been seen yet, flag enclosing packages to indicate that it will be
327 -- elaborated after the generic body. Subprograms declared in the same
328 -- package cannot be inlined by the front-end because front-end inlining
329 -- requires a strict linear order of elaboration.
331 procedure Check_Hidden_Child_Unit
333 Gen_Unit : Entity_Id;
334 Act_Decl_Id : Entity_Id);
335 -- If the generic unit is an implicit child instance within a parent
336 -- instance, we need to make an explicit test that it is not hidden by
337 -- a child instance of the same name and parent.
339 procedure Check_Private_View (N : Node_Id);
340 -- Check whether the type of a generic entity has a different view between
341 -- the point of generic analysis and the point of instantiation. If the
342 -- view has changed, then at the point of instantiation we restore the
343 -- correct view to perform semantic analysis of the instance, and reset
344 -- the current view after instantiation. The processing is driven by the
345 -- current private status of the type of the node, and Has_Private_View,
346 -- a flag that is set at the point of generic compilation. If view and
347 -- flag are inconsistent then the type is updated appropriately.
349 procedure Check_Generic_Actuals
350 (Instance : Entity_Id;
351 Is_Formal_Box : Boolean);
352 -- Similar to previous one. Check the actuals in the instantiation,
353 -- whose views can change between the point of instantiation and the point
354 -- of instantiation of the body. In addition, mark the generic renamings
355 -- as generic actuals, so that they are not compatible with other actuals.
356 -- Recurse on an actual that is a formal package whose declaration has
359 function Contains_Instance_Of
364 -- Inner is instantiated within the generic Outer. Check whether Inner
365 -- directly or indirectly contains an instance of Outer or of one of its
366 -- parents, in the case of a subunit. Each generic unit holds a list of
367 -- the entities instantiated within (at any depth). This procedure
368 -- determines whether the set of such lists contains a cycle, i.e. an
369 -- illegal circular instantiation.
371 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. Used in
374 -- Restore_Private_Views, to keep the formals of such a package visible
375 -- on exit from an inner instantiation.
377 function Find_Actual_Type
379 Gen_Scope : Entity_Id)
381 -- When validating the actual types of a child instance, check whether
382 -- the formal is a formal type of the parent unit, and retrieve the current
383 -- actual for it. Typ is the entity in the analyzed formal type declaration
384 -- (component or index type of an array type) and Gen_Scope is the scope of
385 -- the analyzed formal array type.
387 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
388 -- Given the entity of a unit that is an instantiation, retrieve the
389 -- original instance node. This is used when loading the instantiations
390 -- of the ancestors of a child generic that is being instantiated.
392 function In_Same_Declarative_Part
396 -- True if the instantiation Inst and the given freeze_node F_Node appear
397 -- within the same declarative part, ignoring subunits, but with no inter-
398 -- vening suprograms or concurrent units. If true, the freeze node
399 -- of the instance can be placed after the freeze node of the parent,
400 -- which it itself an instance.
402 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
403 -- Associate analyzed generic parameter with corresponding
404 -- instance. Used for semantic checks at instantiation time.
406 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
407 -- Traverse the Exchanged_Views list to see if a type was private
408 -- and has already been flipped during this phase of instantiation.
410 procedure Hide_Current_Scope;
411 -- When compiling a generic child unit, the parent context must be
412 -- present, but the instance and all entities that may be generated
413 -- must be inserted in the current scope. We leave the current scope
414 -- on the stack, but make its entities invisible to avoid visibility
415 -- problems. This is reversed at the end of instantiations. This is
416 -- not done for the instantiation of the bodies, which only require the
417 -- instances of the generic parents to be in scope.
419 procedure Install_Body
424 -- If the instantiation happens textually before the body of the generic,
425 -- the instantiation of the body must be analyzed after the generic body,
426 -- and not at the point of instantiation. Such early instantiations can
427 -- happen if the generic and the instance appear in a package declaration
428 -- because the generic body can only appear in the corresponding package
429 -- body. Early instantiations can also appear if generic, instance and
430 -- body are all in the declarative part of a subprogram or entry. Entities
431 -- of packages that are early instantiations are delayed, and their freeze
432 -- node appears after the generic body.
434 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
435 -- Insert freeze node at the end of the declarative part that includes the
436 -- instance node N. If N is in the visible part of an enclosing package
437 -- declaration, the freeze node has to be inserted at the end of the
438 -- private declarations, if any.
440 procedure Freeze_Subprogram_Body
441 (Inst_Node : Node_Id;
443 Pack_Id : Entity_Id);
444 -- The generic body may appear textually after the instance, including
445 -- in the proper body of a stub, or within a different package instance.
446 -- Given that the instance can only be elaborated after the generic, we
447 -- place freeze_nodes for the instance and/or for packages that may enclose
448 -- the instance and the generic, so that the back-end can establish the
449 -- proper order of elaboration.
451 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
452 -- When compiling an instance of a child unit the parent (which is
453 -- itself an instance) is an enclosing scope that must be made
454 -- immediately visible. This procedure is also used to install the non-
455 -- generic parent of a generic child unit when compiling its body, so that
456 -- full views of types in the parent are made visible.
458 procedure Remove_Parent (In_Body : Boolean := False);
459 -- Reverse effect after instantiation of child is complete.
461 procedure Inline_Instance_Body
463 Gen_Unit : Entity_Id;
465 -- If front-end inlining is requested, instantiate the package body,
466 -- and preserve the visibility of its compilation unit, to insure
467 -- that successive instantiations succeed.
469 -- The functions Instantiate_XXX perform various legality checks and build
470 -- the declarations for instantiated generic parameters.
471 -- Need to describe what the parameters are ???
473 function Instantiate_Object
476 Analyzed_Formal : Node_Id)
479 function Instantiate_Type
482 Analyzed_Formal : Node_Id)
485 function Instantiate_Formal_Subprogram
488 Analyzed_Formal : Node_Id)
491 function Instantiate_Formal_Package
494 Analyzed_Formal : Node_Id)
496 -- If the formal package is declared with a box, special visibility rules
497 -- apply to its formals: they are in the visible part of the package. This
498 -- is true in the declarative region of the formal package, that is to say
499 -- in the enclosing generic or instantiation. For an instantiation, the
500 -- parameters of the formal package are made visible in an explicit step.
501 -- Furthermore, if the actual is a visible use_clause, these formals must
502 -- be made potentially use_visible as well. On exit from the enclosing
503 -- instantiation, the reverse must be done.
505 -- For a formal package declared without a box, there are conformance rules
506 -- that apply to the actuals in the generic declaration and the actuals of
507 -- the actual package in the enclosing instantiation. The simplest way to
508 -- apply these rules is to repeat the instantiation of the formal package
509 -- in the context of the enclosing instance, and compare the generic
510 -- associations of this instantiation with those of the actual package.
512 function Is_In_Main_Unit (N : Node_Id) return Boolean;
513 -- Test if given node is in the main unit
515 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
516 -- If the generic appears in a separate non-generic library unit,
517 -- load the corresponding body to retrieve the body of the generic.
518 -- N is the node for the generic instantiation, Spec is the generic
519 -- package declaration.
521 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
522 -- Add the context clause of the unit containing a generic unit to
523 -- an instantiation that is a compilation unit.
525 function Get_Associated_Node (N : Node_Id) return Node_Id;
526 -- In order to propagate semantic information back from the analyzed
527 -- copy to the original generic, we maintain links between selected nodes
528 -- in the generic and their corresponding copies. At the end of generic
529 -- analysis, the routine Save_Global_References traverses the generic
530 -- tree, examines the semantic information, and preserves the links to
531 -- those nodes that contain global information. At instantiation, the
532 -- information from the associated node is placed on the new copy, so
533 -- that name resolution is not repeated.
535 -- Three kinds of nodes have associated nodes:
537 -- a) those that contain entities, that is to say identifiers,
538 -- expanded_names, and operators (N_Has_Entity)
540 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
542 -- c) selected components (N_Selected_Component)
544 -- For the first class, the associated node preserves the entity if it is
545 -- global. If the generic contains nested instantiations, the associated_
546 -- node itself has been recopied, and a chain of them must be followed.
548 -- For aggregates, the associated node allows retrieval of the type, which
549 -- may otherwise not appear in the generic. The view of this type may be
550 -- different between generic and instantiation, and the full view can be
551 -- installed before the instantiation is analyzed. For aggregates of
552 -- type extensions, the same view exchange may have to be performed for
553 -- some of the ancestor types, if their view is private at the point of
556 -- Query??? why selected components. What about N_Freeze_Nodes, I assume
557 -- that the answer is no, which means that the comment above for a) is
560 -- The associated node is stored in the Associated_Node field. Note that
561 -- this field overlaps Entity, which is fine, because the whole point is
562 -- that we don't need or want the normal Entity field in this situation.
564 procedure Move_Freeze_Nodes
568 -- Freeze nodes can be generated in the analysis of a generic unit, but
569 -- will not be seen by the back-end. It is necessary to move those nodes
570 -- to the enclosing scope if they freeze an outer entity. We place them
571 -- at the end of the enclosing generic package, which is semantically
574 procedure Pre_Analyze_Actuals (N : Node_Id);
575 -- Analyze actuals to perform name resolution. Full resolution is done
576 -- later, when the expected types are known, but names have to be captured
577 -- before installing parents of generics, that are not visible for the
578 -- actuals themselves.
580 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
581 -- Verify that an attribute that appears as the default for a formal
582 -- subprogram is a function or procedure with the correct profile.
584 -------------------------------------------
585 -- Data Structures for Generic Renamings --
586 -------------------------------------------
588 -- The map Generic_Renamings associates generic entities with their
589 -- corresponding actuals. Currently used to validate type instances.
590 -- It will eventually be used for all generic parameters to eliminate
591 -- the need for overload resolution in the instance.
593 type Assoc_Ptr is new Int;
595 Assoc_Null : constant Assoc_Ptr := -1;
600 Next_In_HTable : Assoc_Ptr;
603 package Generic_Renamings is new Table.Table
604 (Table_Component_Type => Assoc,
605 Table_Index_Type => Assoc_Ptr,
606 Table_Low_Bound => 0,
608 Table_Increment => 100,
609 Table_Name => "Generic_Renamings");
611 -- Variable to hold enclosing instantiation. When the environment is
612 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
614 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
616 -- Hash table for associations
618 HTable_Size : constant := 37;
619 type HTable_Range is range 0 .. HTable_Size - 1;
621 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
622 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
623 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
624 function Hash (F : Entity_Id) return HTable_Range;
626 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
627 Header_Num => HTable_Range,
629 Elmt_Ptr => Assoc_Ptr,
630 Null_Ptr => Assoc_Null,
631 Set_Next => Set_Next_Assoc,
634 Get_Key => Get_Gen_Id,
638 Exchanged_Views : Elist_Id;
639 -- This list holds the private views that have been exchanged during
640 -- instantiation to restore the visibility of the generic declaration.
641 -- (see comments above). After instantiation, the current visibility is
642 -- reestablished by means of a traversal of this list.
644 Hidden_Entities : Elist_Id;
645 -- This list holds the entities of the current scope that are removed
646 -- from immediate visibility when instantiating a child unit. Their
647 -- visibility is restored in Remove_Parent.
649 -- Because instantiations can be recursive, the following must be saved
650 -- on entry and restored on exit from an instantiation (spec or body).
651 -- This is done by the two procedures Save_Env and Restore_Env.
653 type Instance_Env is record
655 Instantiated_Parent : Assoc;
656 Exchanged_Views : Elist_Id;
657 Hidden_Entities : Elist_Id;
658 Current_Sem_Unit : Unit_Number_Type;
661 package Instance_Envs is new Table.Table (
662 Table_Component_Type => Instance_Env,
663 Table_Index_Type => Int,
664 Table_Low_Bound => 0,
666 Table_Increment => 100,
667 Table_Name => "Instance_Envs");
669 procedure Restore_Private_Views
670 (Pack_Id : Entity_Id;
671 Is_Package : Boolean := True);
672 -- Restore the private views of external types, and unmark the generic
673 -- renamings of actuals, so that they become comptible subtypes again.
674 -- For subprograms, Pack_Id is the package constructed to hold the
677 procedure Switch_View (T : Entity_Id);
678 -- Switch the partial and full views of a type and its private
679 -- dependents (i.e. its subtypes and derived types).
681 ------------------------------------
682 -- Structures for Error Reporting --
683 ------------------------------------
685 Instantiation_Node : Node_Id;
686 -- Used by subprograms that validate instantiation of formal parameters
687 -- where there might be no actual on which to place the error message.
688 -- Also used to locate the instantiation node for generic subunits.
690 Instantiation_Error : exception;
691 -- When there is a semantic error in the generic parameter matching,
692 -- there is no point in continuing the instantiation, because the
693 -- number of cascaded errors is unpredictable. This exception aborts
694 -- the instantiation process altogether.
696 S_Adjustment : Sloc_Adjustment;
697 -- Offset created for each node in an instantiation, in order to keep
698 -- track of the source position of the instantiation in each of its nodes.
699 -- A subsequent semantic error or warning on a construct of the instance
700 -- points to both places: the original generic node, and the point of
701 -- instantiation. See Sinput and Sinput.L for additional details.
703 ------------------------------------------------------------
704 -- Data structure for keeping track when inside a Generic --
705 ------------------------------------------------------------
707 -- The following table is used to save values of the Inside_A_Generic
708 -- flag (see spec of Sem) when they are saved by Start_Generic.
710 package Generic_Flags is new Table.Table (
711 Table_Component_Type => Boolean,
712 Table_Index_Type => Int,
713 Table_Low_Bound => 0,
715 Table_Increment => 200,
716 Table_Name => "Generic_Flags");
718 ---------------------------
719 -- Abandon_Instantiation --
720 ---------------------------
722 procedure Abandon_Instantiation (N : Node_Id) is
724 Error_Msg_N ("instantiation abandoned!", N);
725 raise Instantiation_Error;
726 end Abandon_Instantiation;
728 --------------------------
729 -- Analyze_Associations --
730 --------------------------
732 function Analyze_Associations
738 Actuals : List_Id := Generic_Associations (I_Node);
740 Actual_Types : Elist_Id := New_Elmt_List;
741 Assoc : List_Id := New_List;
743 Next_Formal : Node_Id;
744 Temp_Formal : Node_Id;
745 Analyzed_Formal : Node_Id;
746 Defaults : Elist_Id := New_Elmt_List;
749 First_Named : Node_Id := Empty;
750 Found_Assoc : Node_Id;
751 Is_Named_Assoc : Boolean;
752 Num_Matched : Int := 0;
753 Num_Actuals : Int := 0;
755 function Matching_Actual
759 -- Find actual that corresponds to a given a formal parameter. If the
760 -- actuals are positional, return the next one, if any. If the actuals
761 -- are named, scan the parameter associations to find the right one.
762 -- A_F is the corresponding entity in the analyzed generic,which is
763 -- placed on the selector name for ASIS use.
765 procedure Set_Analyzed_Formal;
766 -- Find the node in the generic copy that corresponds to a given formal.
767 -- The semantic information on this node is used to perform legality
768 -- checks on the actuals. Because semantic analysis can introduce some
769 -- anonymous entities or modify the declaration node itself, the
770 -- correspondence between the two lists is not one-one. In addition to
771 -- anonymous types, the presence a formal equality will introduce an
772 -- implicit declaration for the corresponding inequality.
774 ---------------------
775 -- Matching_Actual --
776 ---------------------
778 function Matching_Actual
787 Is_Named_Assoc := False;
789 -- End of list of purely positional parameters
794 -- Case of positional parameter corresponding to current formal
796 elsif No (Selector_Name (Actual)) then
797 Found := Explicit_Generic_Actual_Parameter (Actual);
798 Found_Assoc := Actual;
799 Num_Matched := Num_Matched + 1;
802 -- Otherwise scan list of named actuals to find the one with the
803 -- desired name. All remaining actuals have explicit names.
806 Is_Named_Assoc := True;
810 while Present (Actual) loop
811 if Chars (Selector_Name (Actual)) = Chars (F) then
812 Found := Explicit_Generic_Actual_Parameter (Actual);
813 Set_Entity (Selector_Name (Actual), A_F);
814 Set_Etype (Selector_Name (Actual), Etype (A_F));
815 Found_Assoc := Actual;
816 Num_Matched := Num_Matched + 1;
824 -- Reset for subsequent searches. In most cases the named
825 -- associations are in order. If they are not, we reorder them
826 -- to avoid scanning twice the same actual. This is not just a
827 -- question of efficiency: there may be multiple defaults with
828 -- boxes that have the same name. In a nested instantiation we
829 -- insert actuals for those defaults, and cannot rely on their
830 -- names to disambiguate them.
832 if Actual = First_Named then
835 elsif Present (Actual) then
836 Insert_Before (First_Named, Remove_Next (Prev));
839 Actual := First_Named;
845 -------------------------
846 -- Set_Analyzed_Formal --
847 -------------------------
849 procedure Set_Analyzed_Formal is
852 while Present (Analyzed_Formal) loop
853 Kind := Nkind (Analyzed_Formal);
855 case Nkind (Formal) is
857 when N_Formal_Subprogram_Declaration =>
858 exit when Kind = N_Formal_Subprogram_Declaration
861 (Defining_Unit_Name (Specification (Formal))) =
863 (Defining_Unit_Name (Specification (Analyzed_Formal)));
865 when N_Formal_Package_Declaration =>
867 Kind = N_Formal_Package_Declaration
869 Kind = N_Generic_Package_Declaration;
871 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
875 -- Skip freeze nodes, and nodes inserted to replace
876 -- unrecognized pragmas.
879 Kind /= N_Formal_Subprogram_Declaration
880 and then Kind /= N_Subprogram_Declaration
881 and then Kind /= N_Freeze_Entity
882 and then Kind /= N_Null_Statement
883 and then Kind /= N_Itype_Reference
884 and then Chars (Defining_Identifier (Formal)) =
885 Chars (Defining_Identifier (Analyzed_Formal));
888 Next (Analyzed_Formal);
891 end Set_Analyzed_Formal;
893 -- Start of processing for Analyze_Associations
896 -- If named associations are present, save the first named association
897 -- (it may of course be Empty) to facilitate subsequent name search.
899 if Present (Actuals) then
900 First_Named := First (Actuals);
902 while Present (First_Named)
903 and then No (Selector_Name (First_Named))
905 Num_Actuals := Num_Actuals + 1;
910 Named := First_Named;
911 while Present (Named) loop
912 if No (Selector_Name (Named)) then
913 Error_Msg_N ("invalid positional actual after named one", Named);
914 Abandon_Instantiation (Named);
917 Num_Actuals := Num_Actuals + 1;
921 if Present (Formals) then
922 Formal := First_Non_Pragma (Formals);
923 Analyzed_Formal := First_Non_Pragma (F_Copy);
925 if Present (Actuals) then
926 Actual := First (Actuals);
928 -- All formals should have default values
934 while Present (Formal) loop
936 Next_Formal := Next_Non_Pragma (Formal);
938 case Nkind (Formal) is
939 when N_Formal_Object_Declaration =>
942 Defining_Identifier (Formal),
943 Defining_Identifier (Analyzed_Formal));
946 (Instantiate_Object (Formal, Match, Analyzed_Formal),
949 when N_Formal_Type_Declaration =>
952 Defining_Identifier (Formal),
953 Defining_Identifier (Analyzed_Formal));
956 Error_Msg_NE ("missing actual for instantiation of &",
957 Instantiation_Node, Defining_Identifier (Formal));
958 Abandon_Instantiation (Instantiation_Node);
963 Instantiate_Type (Formal, Match, Analyzed_Formal));
965 -- an instantiation is a freeze point for the actuals,
966 -- unless this is a rewritten formal package.
968 if Nkind (I_Node) /= N_Formal_Package_Declaration then
969 Append_Elmt (Entity (Match), Actual_Types);
973 -- A remote access-to-class-wide type must not be an
974 -- actual parameter for a generic formal of an access
975 -- type (E.2.2 (17)).
977 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
979 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
980 N_Access_To_Object_Definition
982 Validate_Remote_Access_To_Class_Wide_Type (Match);
985 when N_Formal_Subprogram_Declaration =>
988 Defining_Unit_Name (Specification (Formal)),
989 Defining_Unit_Name (Specification (Analyzed_Formal)));
991 -- If the formal subprogram has the same name as
992 -- another formal subprogram of the generic, then
993 -- a named association is illegal (12.3(9)). Exclude
994 -- named associations that are generated for a nested
998 and then Is_Named_Assoc
999 and then Comes_From_Source (Found_Assoc)
1001 Temp_Formal := First (Formals);
1002 while Present (Temp_Formal) loop
1003 if Nkind (Temp_Formal) =
1004 N_Formal_Subprogram_Declaration
1005 and then Temp_Formal /= Formal
1007 Chars (Selector_Name (Found_Assoc)) =
1008 Chars (Defining_Unit_Name
1009 (Specification (Temp_Formal)))
1012 ("name not allowed for overloaded formal",
1014 Abandon_Instantiation (Instantiation_Node);
1022 Instantiate_Formal_Subprogram
1023 (Formal, Match, Analyzed_Formal));
1026 and then Box_Present (Formal)
1029 (Defining_Unit_Name (Specification (Last (Assoc))),
1033 when N_Formal_Package_Declaration =>
1036 Defining_Identifier (Formal),
1037 Defining_Identifier (Original_Node (Analyzed_Formal)));
1041 ("missing actual for instantiation of&",
1043 Defining_Identifier (Formal));
1045 Abandon_Instantiation (Instantiation_Node);
1050 (Instantiate_Formal_Package
1051 (Formal, Match, Analyzed_Formal),
1055 -- For use type and use package appearing in the context
1056 -- clause, we have already copied them, so we can just
1057 -- move them where they belong (we mustn't recopy them
1058 -- since this would mess up the Sloc values).
1060 when N_Use_Package_Clause |
1061 N_Use_Type_Clause =>
1063 Append (Formal, Assoc);
1066 raise Program_Error;
1070 Formal := Next_Formal;
1071 Next_Non_Pragma (Analyzed_Formal);
1074 if Num_Actuals > Num_Matched then
1076 ("unmatched actuals in instantiation", Instantiation_Node);
1079 elsif Present (Actuals) then
1081 ("too many actuals in generic instantiation", Instantiation_Node);
1085 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1088 while Present (Elmt) loop
1089 Freeze_Before (I_Node, Node (Elmt));
1094 -- If there are default subprograms, normalize the tree by adding
1095 -- explicit associations for them. This is required if the instance
1096 -- appears within a generic.
1104 Elmt := First_Elmt (Defaults);
1105 while Present (Elmt) loop
1106 if No (Actuals) then
1107 Actuals := New_List;
1108 Set_Generic_Associations (I_Node, Actuals);
1111 Subp := Node (Elmt);
1113 Make_Generic_Association (Sloc (Subp),
1114 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1115 Explicit_Generic_Actual_Parameter =>
1116 New_Occurrence_Of (Subp, Sloc (Subp)));
1117 Mark_Rewrite_Insertion (New_D);
1118 Append_To (Actuals, New_D);
1124 end Analyze_Associations;
1126 -------------------------------
1127 -- Analyze_Formal_Array_Type --
1128 -------------------------------
1130 procedure Analyze_Formal_Array_Type
1131 (T : in out Entity_Id;
1137 -- Treated like a non-generic array declaration, with
1138 -- additional semantic checks.
1142 if Nkind (Def) = N_Constrained_Array_Definition then
1143 DSS := First (Discrete_Subtype_Definitions (Def));
1144 while Present (DSS) loop
1145 if Nkind (DSS) = N_Subtype_Indication
1146 or else Nkind (DSS) = N_Range
1147 or else Nkind (DSS) = N_Attribute_Reference
1149 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1156 Array_Type_Declaration (T, Def);
1157 Set_Is_Generic_Type (Base_Type (T));
1159 if Ekind (Component_Type (T)) = E_Incomplete_Type
1160 and then No (Full_View (Component_Type (T)))
1162 Error_Msg_N ("premature usage of incomplete type", Def);
1164 elsif Is_Internal (Component_Type (T))
1165 and then Nkind (Original_Node (Subtype_Indication (Def)))
1166 /= N_Attribute_Reference
1169 ("only a subtype mark is allowed in a formal",
1170 Subtype_Indication (Def));
1173 end Analyze_Formal_Array_Type;
1175 ---------------------------------------------
1176 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1177 ---------------------------------------------
1179 -- As for other generic types, we create a valid type representation
1180 -- with legal but arbitrary attributes, whose values are never considered
1181 -- static. For all scalar types we introduce an anonymous base type, with
1182 -- the same attributes. We choose the corresponding integer type to be
1183 -- Standard_Integer.
1185 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1189 Loc : constant Source_Ptr := Sloc (Def);
1190 Base : constant Entity_Id :=
1192 (E_Decimal_Fixed_Point_Type,
1193 Current_Scope, Sloc (Def), 'G');
1194 Int_Base : constant Entity_Id := Standard_Integer;
1195 Delta_Val : constant Ureal := Ureal_1;
1196 Digs_Val : constant Uint := Uint_6;
1201 Set_Etype (Base, Base);
1202 Set_Size_Info (Base, Int_Base);
1203 Set_RM_Size (Base, RM_Size (Int_Base));
1204 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1205 Set_Digits_Value (Base, Digs_Val);
1206 Set_Delta_Value (Base, Delta_Val);
1207 Set_Small_Value (Base, Delta_Val);
1208 Set_Scalar_Range (Base,
1210 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1211 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1213 Set_Is_Generic_Type (Base);
1214 Set_Parent (Base, Parent (Def));
1216 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1217 Set_Etype (T, Base);
1218 Set_Size_Info (T, Int_Base);
1219 Set_RM_Size (T, RM_Size (Int_Base));
1220 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1221 Set_Digits_Value (T, Digs_Val);
1222 Set_Delta_Value (T, Delta_Val);
1223 Set_Small_Value (T, Delta_Val);
1224 Set_Scalar_Range (T, Scalar_Range (Base));
1226 end Analyze_Formal_Decimal_Fixed_Point_Type;
1228 ---------------------------------
1229 -- Analyze_Formal_Derived_Type --
1230 ---------------------------------
1232 procedure Analyze_Formal_Derived_Type
1237 Loc : constant Source_Ptr := Sloc (Def);
1239 Unk_Disc : Boolean := Unknown_Discriminants_Present (N);
1242 Set_Is_Generic_Type (T);
1244 if Private_Present (Def) then
1246 Make_Private_Extension_Declaration (Loc,
1247 Defining_Identifier => T,
1248 Discriminant_Specifications => Discriminant_Specifications (N),
1249 Unknown_Discriminants_Present => Unk_Disc,
1250 Subtype_Indication => Subtype_Mark (Def));
1252 Set_Abstract_Present (New_N, Abstract_Present (Def));
1256 Make_Full_Type_Declaration (Loc,
1257 Defining_Identifier => T,
1258 Discriminant_Specifications =>
1259 Discriminant_Specifications (Parent (T)),
1261 Make_Derived_Type_Definition (Loc,
1262 Subtype_Indication => Subtype_Mark (Def)));
1264 Set_Abstract_Present
1265 (Type_Definition (New_N), Abstract_Present (Def));
1272 if not Is_Composite_Type (T) then
1274 ("unknown discriminants not allowed for elementary types", N);
1276 Set_Has_Unknown_Discriminants (T);
1277 Set_Is_Constrained (T, False);
1281 -- If the parent type has a known size, so does the formal, which
1282 -- makes legal representation clauses that involve the formal.
1284 Set_Size_Known_At_Compile_Time
1285 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1287 end Analyze_Formal_Derived_Type;
1289 ----------------------------------
1290 -- Analyze_Formal_Discrete_Type --
1291 ----------------------------------
1293 -- The operations defined for a discrete types are those of an
1294 -- enumeration type. The size is set to an arbitrary value, for use
1295 -- in analyzing the generic unit.
1297 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1298 Loc : constant Source_Ptr := Sloc (Def);
1304 Set_Ekind (T, E_Enumeration_Type);
1309 -- For semantic analysis, the bounds of the type must be set to some
1310 -- non-static value. The simplest is to create attribute nodes for
1311 -- those bounds, that refer to the type itself. These bounds are never
1312 -- analyzed but serve as place-holders.
1315 Make_Attribute_Reference (Loc,
1316 Attribute_Name => Name_First,
1317 Prefix => New_Reference_To (T, Loc));
1321 Make_Attribute_Reference (Loc,
1322 Attribute_Name => Name_Last,
1323 Prefix => New_Reference_To (T, Loc));
1326 Set_Scalar_Range (T,
1331 end Analyze_Formal_Discrete_Type;
1333 ----------------------------------
1334 -- Analyze_Formal_Floating_Type --
1335 ---------------------------------
1337 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1338 Base : constant Entity_Id :=
1340 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1343 -- The various semantic attributes are taken from the predefined type
1344 -- Float, just so that all of them are initialized. Their values are
1345 -- never used because no constant folding or expansion takes place in
1346 -- the generic itself.
1349 Set_Ekind (T, E_Floating_Point_Subtype);
1350 Set_Etype (T, Base);
1351 Set_Size_Info (T, (Standard_Float));
1352 Set_RM_Size (T, RM_Size (Standard_Float));
1353 Set_Digits_Value (T, Digits_Value (Standard_Float));
1354 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1356 Set_Is_Generic_Type (Base);
1357 Set_Etype (Base, Base);
1358 Set_Size_Info (Base, (Standard_Float));
1359 Set_RM_Size (Base, RM_Size (Standard_Float));
1360 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1361 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1362 Set_Parent (Base, Parent (Def));
1363 end Analyze_Formal_Floating_Type;
1365 ---------------------------------
1366 -- Analyze_Formal_Modular_Type --
1367 ---------------------------------
1369 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1371 -- Apart from their entity kind, generic modular types are treated
1372 -- like signed integer types, and have the same attributes.
1374 Analyze_Formal_Signed_Integer_Type (T, Def);
1375 Set_Ekind (T, E_Modular_Integer_Subtype);
1376 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1378 end Analyze_Formal_Modular_Type;
1380 ---------------------------------------
1381 -- Analyze_Formal_Object_Declaration --
1382 ---------------------------------------
1384 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1385 E : constant Node_Id := Expression (N);
1386 Id : Node_Id := Defining_Identifier (N);
1393 -- Determine the mode of the formal object
1395 if Out_Present (N) then
1396 K := E_Generic_In_Out_Parameter;
1398 if not In_Present (N) then
1399 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1403 K := E_Generic_In_Parameter;
1406 Find_Type (Subtype_Mark (N));
1407 T := Entity (Subtype_Mark (N));
1409 if Ekind (T) = E_Incomplete_Type then
1410 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1413 if K = E_Generic_In_Parameter then
1414 if Is_Limited_Type (T) then
1416 ("generic formal of mode IN must not be of limited type", N);
1419 if Is_Abstract (T) then
1421 ("generic formal of mode IN must not be of abstract type", N);
1425 Analyze_Default_Expression (E, T);
1431 -- Case of generic IN OUT parameter.
1434 -- If the formal has an unconstrained type, construct its
1435 -- actual subtype, as is done for subprogram formals. In this
1436 -- fashion, all its uses can refer to specific bounds.
1441 if (Is_Array_Type (T)
1442 and then not Is_Constrained (T))
1444 (Ekind (T) = E_Record_Type
1445 and then Has_Discriminants (T))
1448 Non_Freezing_Ref : constant Node_Id :=
1449 New_Reference_To (Id, Sloc (Id));
1453 -- Make sure that the actual subtype doesn't generate
1456 Set_Must_Not_Freeze (Non_Freezing_Ref);
1457 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1458 Insert_Before_And_Analyze (N, Decl);
1459 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1462 Set_Actual_Subtype (Id, T);
1467 ("initialization not allowed for `IN OUT` formals", N);
1471 end Analyze_Formal_Object_Declaration;
1473 ----------------------------------------------
1474 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1475 ----------------------------------------------
1477 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1481 Loc : constant Source_Ptr := Sloc (Def);
1482 Base : constant Entity_Id :=
1484 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1486 -- The semantic attributes are set for completeness only, their
1487 -- values will never be used, because all properties of the type
1491 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1492 Set_Etype (T, Base);
1493 Set_Size_Info (T, Standard_Integer);
1494 Set_RM_Size (T, RM_Size (Standard_Integer));
1495 Set_Small_Value (T, Ureal_1);
1496 Set_Delta_Value (T, Ureal_1);
1497 Set_Scalar_Range (T,
1499 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1500 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1502 Set_Is_Generic_Type (Base);
1503 Set_Etype (Base, Base);
1504 Set_Size_Info (Base, Standard_Integer);
1505 Set_RM_Size (Base, RM_Size (Standard_Integer));
1506 Set_Small_Value (Base, Ureal_1);
1507 Set_Delta_Value (Base, Ureal_1);
1508 Set_Scalar_Range (Base, Scalar_Range (T));
1509 Set_Parent (Base, Parent (Def));
1510 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1512 ----------------------------
1513 -- Analyze_Formal_Package --
1514 ----------------------------
1516 procedure Analyze_Formal_Package (N : Node_Id) is
1517 Loc : constant Source_Ptr := Sloc (N);
1518 Formal : Entity_Id := Defining_Identifier (N);
1519 Gen_Id : constant Node_Id := Name (N);
1521 Gen_Unit : Entity_Id;
1523 Parent_Installed : Boolean := False;
1525 Parent_Instance : Entity_Id;
1526 Renaming_In_Par : Entity_Id;
1529 Text_IO_Kludge (Gen_Id);
1531 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1532 Gen_Unit := Entity (Gen_Id);
1534 if Ekind (Gen_Unit) /= E_Generic_Package then
1535 Error_Msg_N ("expect generic package name", Gen_Id);
1538 elsif Gen_Unit = Current_Scope then
1540 ("generic package cannot be used as a formal package of itself",
1545 -- Check for a formal package that is a package renaming.
1547 if Present (Renamed_Object (Gen_Unit)) then
1548 Gen_Unit := Renamed_Object (Gen_Unit);
1551 -- The formal package is treated like a regular instance, but only
1552 -- the specification needs to be instantiated, to make entities visible.
1554 if not Box_Present (N) then
1555 Hidden_Entities := New_Elmt_List;
1556 Analyze_Package_Instantiation (N);
1558 if Parent_Installed then
1563 -- If there are no generic associations, the generic parameters
1564 -- appear as local entities and are instantiated like them. We copy
1565 -- the generic package declaration as if it were an instantiation,
1566 -- and analyze it like a regular package, except that we treat the
1567 -- formals as additional visible components.
1569 Save_Env (Gen_Unit, Formal);
1571 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1573 if In_Extended_Main_Source_Unit (N) then
1574 Set_Is_Instantiated (Gen_Unit);
1575 Generate_Reference (Gen_Unit, N);
1580 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1581 Set_Defining_Unit_Name (Specification (New_N), Formal);
1584 Enter_Name (Formal);
1585 Set_Ekind (Formal, E_Generic_Package);
1586 Set_Etype (Formal, Standard_Void_Type);
1587 Set_Inner_Instances (Formal, New_Elmt_List);
1590 -- Within the formal, the name of the generic package is a renaming
1591 -- of the formal (as for a regular instantiation).
1593 Renaming := Make_Package_Renaming_Declaration (Loc,
1594 Defining_Unit_Name =>
1595 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1596 Name => New_Reference_To (Formal, Loc));
1598 if Present (Visible_Declarations (Specification (N))) then
1599 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1600 elsif Present (Private_Declarations (Specification (N))) then
1601 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1604 if Is_Child_Unit (Gen_Unit)
1605 and then Parent_Installed
1607 -- Similarly, we have to make the name of the formal visible in
1608 -- the parent instance, to resolve properly fully qualified names
1609 -- that may appear in the generic unit. The parent instance has
1610 -- been placed on the scope stack ahead of the current scope.
1612 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1615 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1616 Set_Ekind (Renaming_In_Par, E_Package);
1617 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1618 Set_Scope (Renaming_In_Par, Parent_Instance);
1619 Set_Parent (Renaming_In_Par, Parent (Formal));
1620 Set_Renamed_Object (Renaming_In_Par, Formal);
1621 Append_Entity (Renaming_In_Par, Parent_Instance);
1624 Analyze_Generic_Formal_Part (N);
1625 Analyze (Specification (N));
1626 End_Package_Scope (Formal);
1628 if Parent_Installed then
1634 -- Inside the generic unit, the formal package is a regular
1635 -- package, but no body is needed for it. Note that after
1636 -- instantiation, the defining_unit_name we need is in the
1637 -- new tree and not in the original. (see Package_Instantiation).
1638 -- A generic formal package is an instance, and can be used as
1639 -- an actual for an inner instance. Mark its generic parent.
1641 Set_Ekind (Formal, E_Package);
1642 Set_Generic_Parent (Specification (N), Gen_Unit);
1643 Set_Has_Completion (Formal, True);
1645 end Analyze_Formal_Package;
1647 ---------------------------------
1648 -- Analyze_Formal_Private_Type --
1649 ---------------------------------
1651 procedure Analyze_Formal_Private_Type
1657 New_Private_Type (N, T, Def);
1659 -- Set the size to an arbitrary but legal value.
1661 Set_Size_Info (T, Standard_Integer);
1662 Set_RM_Size (T, RM_Size (Standard_Integer));
1663 end Analyze_Formal_Private_Type;
1665 ----------------------------------------
1666 -- Analyze_Formal_Signed_Integer_Type --
1667 ----------------------------------------
1669 procedure Analyze_Formal_Signed_Integer_Type
1673 Base : constant Entity_Id :=
1675 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1680 Set_Ekind (T, E_Signed_Integer_Subtype);
1681 Set_Etype (T, Base);
1682 Set_Size_Info (T, Standard_Integer);
1683 Set_RM_Size (T, RM_Size (Standard_Integer));
1684 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1686 Set_Is_Generic_Type (Base);
1687 Set_Size_Info (Base, Standard_Integer);
1688 Set_RM_Size (Base, RM_Size (Standard_Integer));
1689 Set_Etype (Base, Base);
1690 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1691 Set_Parent (Base, Parent (Def));
1692 end Analyze_Formal_Signed_Integer_Type;
1694 -------------------------------
1695 -- Analyze_Formal_Subprogram --
1696 -------------------------------
1698 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1699 Spec : constant Node_Id := Specification (N);
1700 Def : constant Node_Id := Default_Name (N);
1701 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1705 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1706 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1710 Analyze_Subprogram_Declaration (N);
1711 Set_Is_Formal_Subprogram (Nam);
1712 Set_Has_Completion (Nam);
1714 -- Default name is resolved at the point of instantiation
1716 if Box_Present (N) then
1719 -- Else default is bound at the point of generic declaration
1721 elsif Present (Def) then
1722 if Nkind (Def) = N_Operator_Symbol then
1723 Find_Direct_Name (Def);
1725 elsif Nkind (Def) /= N_Attribute_Reference then
1729 -- For an attribute reference, analyze the prefix and verify
1730 -- that it has the proper profile for the subprogram.
1732 Analyze (Prefix (Def));
1733 Valid_Default_Attribute (Nam, Def);
1737 -- Default name may be overloaded, in which case the interpretation
1738 -- with the correct profile must be selected, as for a renaming.
1740 if Etype (Def) = Any_Type then
1743 elsif Nkind (Def) = N_Selected_Component then
1744 Subp := Entity (Selector_Name (Def));
1746 if Ekind (Subp) /= E_Entry then
1747 Error_Msg_N ("expect valid subprogram name as default", Def);
1751 elsif Nkind (Def) = N_Indexed_Component then
1753 if Nkind (Prefix (Def)) /= N_Selected_Component then
1754 Error_Msg_N ("expect valid subprogram name as default", Def);
1758 Subp := Entity (Selector_Name (Prefix (Def)));
1760 if Ekind (Subp) /= E_Entry_Family then
1761 Error_Msg_N ("expect valid subprogram name as default", Def);
1766 elsif Nkind (Def) = N_Character_Literal then
1768 -- Needs some type checks: subprogram should be parameterless???
1770 Resolve (Def, (Etype (Nam)));
1772 elsif (not Is_Entity_Name (Def)
1773 or else not Is_Overloadable (Entity (Def)))
1775 Error_Msg_N ("expect valid subprogram name as default", Def);
1778 elsif not Is_Overloaded (Def) then
1779 Subp := Entity (Def);
1782 Error_Msg_N ("premature usage of formal subprogram", Def);
1784 elsif not Entity_Matches_Spec (Subp, Nam) then
1785 Error_Msg_N ("no visible entity matches specification", Def);
1791 I1 : Interp_Index := 0;
1797 Get_First_Interp (Def, I, It);
1798 while Present (It.Nam) loop
1800 if Entity_Matches_Spec (It.Nam, Nam) then
1801 if Subp /= Any_Id then
1802 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1804 if It1 = No_Interp then
1805 Error_Msg_N ("ambiguous default subprogram", Def);
1818 Get_Next_Interp (I, It);
1822 if Subp /= Any_Id then
1823 Set_Entity (Def, Subp);
1826 Error_Msg_N ("premature usage of formal subprogram", Def);
1828 elsif Ekind (Subp) /= E_Operator then
1829 Check_Mode_Conformant (Subp, Nam);
1833 Error_Msg_N ("no visible subprogram matches specification", N);
1837 end Analyze_Formal_Subprogram;
1839 -------------------------------------
1840 -- Analyze_Formal_Type_Declaration --
1841 -------------------------------------
1843 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1844 Def : constant Node_Id := Formal_Type_Definition (N);
1848 T := Defining_Identifier (N);
1850 if Present (Discriminant_Specifications (N))
1851 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1854 ("discriminants not allowed for this formal type",
1855 Defining_Identifier (First (Discriminant_Specifications (N))));
1858 -- Enter the new name, and branch to specific routine.
1861 when N_Formal_Private_Type_Definition
1862 => Analyze_Formal_Private_Type (N, T, Def);
1864 when N_Formal_Derived_Type_Definition
1865 => Analyze_Formal_Derived_Type (N, T, Def);
1867 when N_Formal_Discrete_Type_Definition
1868 => Analyze_Formal_Discrete_Type (T, Def);
1870 when N_Formal_Signed_Integer_Type_Definition
1871 => Analyze_Formal_Signed_Integer_Type (T, Def);
1873 when N_Formal_Modular_Type_Definition
1874 => Analyze_Formal_Modular_Type (T, Def);
1876 when N_Formal_Floating_Point_Definition
1877 => Analyze_Formal_Floating_Type (T, Def);
1879 when N_Formal_Ordinary_Fixed_Point_Definition
1880 => Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1882 when N_Formal_Decimal_Fixed_Point_Definition
1883 => Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1885 when N_Array_Type_Definition
1886 => Analyze_Formal_Array_Type (T, Def);
1888 when N_Access_To_Object_Definition |
1889 N_Access_Function_Definition |
1890 N_Access_Procedure_Definition
1891 => Analyze_Generic_Access_Type (T, Def);
1894 raise Program_Error;
1898 Set_Is_Generic_Type (T);
1900 end Analyze_Formal_Type_Declaration;
1902 ------------------------------------
1903 -- Analyze_Function_Instantiation --
1904 ------------------------------------
1906 procedure Analyze_Function_Instantiation (N : Node_Id) is
1908 Analyze_Subprogram_Instantiation (N, E_Function);
1909 end Analyze_Function_Instantiation;
1911 ---------------------------------
1912 -- Analyze_Generic_Access_Type --
1913 ---------------------------------
1915 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1919 if Nkind (Def) = N_Access_To_Object_Definition then
1920 Access_Type_Declaration (T, Def);
1922 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1923 and then No (Full_View (Designated_Type (T)))
1924 and then not Is_Generic_Type (Designated_Type (T))
1926 Error_Msg_N ("premature usage of incomplete type", Def);
1928 elsif Is_Internal (Designated_Type (T)) then
1930 ("only a subtype mark is allowed in a formal", Def);
1934 Access_Subprogram_Declaration (T, Def);
1936 end Analyze_Generic_Access_Type;
1938 ---------------------------------
1939 -- Analyze_Generic_Formal_Part --
1940 ---------------------------------
1942 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
1943 Gen_Parm_Decl : Node_Id;
1946 -- The generic formals are processed in the scope of the generic
1947 -- unit, where they are immediately visible. The scope is installed
1950 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
1952 while Present (Gen_Parm_Decl) loop
1953 Analyze (Gen_Parm_Decl);
1954 Next (Gen_Parm_Decl);
1956 end Analyze_Generic_Formal_Part;
1958 ------------------------------------------
1959 -- Analyze_Generic_Package_Declaration --
1960 ------------------------------------------
1962 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
1965 Save_Parent : Node_Id;
1968 -- Create copy of generic unit, and save for instantiation.
1969 -- If the unit is a child unit, do not copy the specifications
1970 -- for the parent, which are not part of the generic tree.
1972 Save_Parent := Parent_Spec (N);
1973 Set_Parent_Spec (N, Empty);
1975 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
1976 Set_Parent_Spec (New_N, Save_Parent);
1978 Id := Defining_Entity (N);
1979 Generate_Definition (Id);
1981 -- Expansion is not applied to generic units.
1986 Set_Ekind (Id, E_Generic_Package);
1987 Set_Etype (Id, Standard_Void_Type);
1989 Enter_Generic_Scope (Id);
1990 Set_Inner_Instances (Id, New_Elmt_List);
1992 Set_Categorization_From_Pragmas (N);
1993 Set_Is_Pure (Id, Is_Pure (Current_Scope));
1995 -- For a library unit, we have reconstructed the entity for the
1996 -- unit, and must reset it in the library tables.
1998 if Nkind (Parent (N)) = N_Compilation_Unit then
1999 Set_Cunit_Entity (Current_Sem_Unit, Id);
2002 Analyze_Generic_Formal_Part (N);
2004 -- After processing the generic formals, analysis proceeds
2005 -- as for a non-generic package.
2007 Analyze (Specification (N));
2009 Validate_Categorization_Dependency (N, Id);
2013 End_Package_Scope (Id);
2014 Exit_Generic_Scope (Id);
2016 if Nkind (Parent (N)) /= N_Compilation_Unit then
2017 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2018 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2019 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2022 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2023 Validate_RT_RAT_Component (N);
2026 end Analyze_Generic_Package_Declaration;
2028 --------------------------------------------
2029 -- Analyze_Generic_Subprogram_Declaration --
2030 --------------------------------------------
2032 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2037 Save_Parent : Node_Id;
2040 -- Create copy of generic unit,and save for instantiation.
2041 -- If the unit is a child unit, do not copy the specifications
2042 -- for the parent, which are not part of the generic tree.
2044 Save_Parent := Parent_Spec (N);
2045 Set_Parent_Spec (N, Empty);
2047 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2048 Set_Parent_Spec (New_N, Save_Parent);
2051 Spec := Specification (N);
2052 Id := Defining_Entity (Spec);
2053 Generate_Definition (Id);
2055 if Nkind (Id) = N_Defining_Operator_Symbol then
2057 ("operator symbol not allowed for generic subprogram", Id);
2064 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2066 Enter_Generic_Scope (Id);
2067 Set_Inner_Instances (Id, New_Elmt_List);
2068 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2070 Analyze_Generic_Formal_Part (N);
2072 Formals := Parameter_Specifications (Spec);
2074 if Present (Formals) then
2075 Process_Formals (Id, Formals, Spec);
2078 if Nkind (Spec) = N_Function_Specification then
2079 Set_Ekind (Id, E_Generic_Function);
2080 Find_Type (Subtype_Mark (Spec));
2081 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2083 Set_Ekind (Id, E_Generic_Procedure);
2084 Set_Etype (Id, Standard_Void_Type);
2087 -- For a library unit, we have reconstructed the entity for the
2088 -- unit, and must reset it in the library tables. We also need
2089 -- to make sure that Body_Required is set properly in the original
2090 -- compilation unit node.
2092 if Nkind (Parent (N)) = N_Compilation_Unit then
2093 Set_Cunit_Entity (Current_Sem_Unit, Id);
2094 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2097 Set_Categorization_From_Pragmas (N);
2098 Validate_Categorization_Dependency (N, Id);
2100 Save_Global_References (Original_Node (N));
2104 Exit_Generic_Scope (Id);
2106 end Analyze_Generic_Subprogram_Declaration;
2108 -----------------------------------
2109 -- Analyze_Package_Instantiation --
2110 -----------------------------------
2112 -- Note: this procedure is also used for formal package declarations,
2113 -- in which case the argument N is an N_Formal_Package_Declaration
2114 -- node. This should really be noted in the spec! ???
2116 procedure Analyze_Package_Instantiation (N : Node_Id) is
2117 Loc : constant Source_Ptr := Sloc (N);
2118 Gen_Id : constant Node_Id := Name (N);
2121 Act_Decl_Name : Node_Id;
2122 Act_Decl_Id : Entity_Id;
2127 Gen_Unit : Entity_Id;
2129 Is_Actual_Pack : Boolean := Is_Internal (Defining_Entity (N));
2130 Parent_Installed : Boolean := False;
2131 Renaming_List : List_Id;
2132 Unit_Renaming : Node_Id;
2133 Needs_Body : Boolean;
2134 Inline_Now : Boolean := False;
2136 procedure Delay_Descriptors (E : Entity_Id);
2137 -- Delay generation of subprogram descriptors for given entity
2139 function Might_Inline_Subp return Boolean;
2140 -- If inlining is active and the generic contains inlined subprograms,
2141 -- we instantiate the body. This may cause superfluous instantiations,
2142 -- but it is simpler than detecting the need for the body at the point
2143 -- of inlining, when the context of the instance is not available.
2145 -----------------------
2146 -- Delay_Descriptors --
2147 -----------------------
2149 procedure Delay_Descriptors (E : Entity_Id) is
2151 if not Delay_Subprogram_Descriptors (E) then
2152 Set_Delay_Subprogram_Descriptors (E);
2153 Pending_Descriptor.Increment_Last;
2154 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2156 end Delay_Descriptors;
2158 -----------------------
2159 -- Might_Inline_Subp --
2160 -----------------------
2162 function Might_Inline_Subp return Boolean is
2166 if not Inline_Processing_Required then
2170 E := First_Entity (Gen_Unit);
2172 while Present (E) loop
2174 if Is_Subprogram (E)
2175 and then Is_Inlined (E)
2185 end Might_Inline_Subp;
2187 -- Start of processing for Analyze_Package_Instantiation
2190 -- Very first thing: apply the special kludge for Text_IO processing
2191 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2193 Text_IO_Kludge (Name (N));
2195 -- Make node global for error reporting.
2197 Instantiation_Node := N;
2199 -- Case of instantiation of a generic package
2201 if Nkind (N) = N_Package_Instantiation then
2202 Act_Decl_Id := New_Copy (Defining_Entity (N));
2203 Set_Comes_From_Source (Act_Decl_Id, True);
2205 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2207 Make_Defining_Program_Unit_Name (Loc,
2208 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2209 Defining_Identifier => Act_Decl_Id);
2211 Act_Decl_Name := Act_Decl_Id;
2214 -- Case of instantiation of a formal package
2217 Act_Decl_Id := Defining_Identifier (N);
2218 Act_Decl_Name := Act_Decl_Id;
2221 Generate_Definition (Act_Decl_Id);
2222 Pre_Analyze_Actuals (N);
2224 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2225 Gen_Unit := Entity (Gen_Id);
2227 -- Verify that it is the name of a generic package
2229 if Etype (Gen_Unit) = Any_Type then
2232 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2234 ("expect name of generic package in instantiation", Gen_Id);
2238 if In_Extended_Main_Source_Unit (N) then
2239 Set_Is_Instantiated (Gen_Unit);
2240 Generate_Reference (Gen_Unit, N);
2242 if Present (Renamed_Object (Gen_Unit)) then
2243 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2244 Generate_Reference (Renamed_Object (Gen_Unit), N);
2248 if Nkind (Gen_Id) = N_Identifier
2249 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2252 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2254 elsif Nkind (Gen_Id) = N_Expanded_Name
2255 and then Is_Child_Unit (Gen_Unit)
2256 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2257 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2260 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2263 -- If renaming, indicate this is an instantiation of renamed unit.
2265 if Present (Renamed_Object (Gen_Unit))
2266 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2268 Gen_Unit := Renamed_Object (Gen_Unit);
2269 Set_Entity (Gen_Id, Gen_Unit);
2272 -- Verify that there are no circular instantiations.
2274 if In_Open_Scopes (Gen_Unit) then
2275 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2278 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2279 Error_Msg_Node_2 := Current_Scope;
2281 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2282 Circularity_Detected := True;
2286 Save_Env (Gen_Unit, Act_Decl_Id);
2287 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2289 -- Initialize renamings map, for error checking, and the list
2290 -- that holds private entities whose views have changed between
2291 -- generic definition and instantiation. If this is the instance
2292 -- created to validate an actual package, the instantiation
2293 -- environment is that of the enclosing instance.
2295 Generic_Renamings.Set_Last (0);
2296 Generic_Renamings_HTable.Reset;
2298 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2300 -- Copy original generic tree, to produce text for instantiation.
2304 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2306 Act_Spec := Specification (Act_Tree);
2308 -- If this is the instance created to validate an actual package,
2309 -- only the formals matter, do not examine the package spec itself.
2311 if Is_Actual_Pack then
2312 Set_Visible_Declarations (Act_Spec, New_List);
2313 Set_Private_Declarations (Act_Spec, New_List);
2317 Analyze_Associations
2319 Generic_Formal_Declarations (Act_Tree),
2320 Generic_Formal_Declarations (Gen_Decl));
2322 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2323 Set_Is_Generic_Instance (Act_Decl_Id);
2325 Set_Generic_Parent (Act_Spec, Gen_Unit);
2327 -- References to the generic in its own declaration or its body
2328 -- are references to the instance. Add a renaming declaration for
2329 -- the generic unit itself. This declaration, as well as the renaming
2330 -- declarations for the generic formals, must remain private to the
2331 -- unit: the formals, because this is the language semantics, and
2332 -- the unit because its use is an artifact of the implementation.
2335 Make_Package_Renaming_Declaration (Loc,
2336 Defining_Unit_Name =>
2337 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2338 Name => New_Reference_To (Act_Decl_Id, Loc));
2340 Append (Unit_Renaming, Renaming_List);
2342 -- The renaming declarations are the first local declarations of
2345 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2347 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2349 Set_Visible_Declarations (Act_Spec, Renaming_List);
2353 Make_Package_Declaration (Loc,
2354 Specification => Act_Spec);
2356 -- Save the instantiation node, for subsequent instantiation
2357 -- of the body, if there is one and we are generating code for
2358 -- the current unit. Mark the unit as having a body, to avoid
2359 -- a premature error message.
2361 -- We instantiate the body if we are generating code, if we are
2362 -- generating cross-reference information, or if we are building
2363 -- trees for ASIS use.
2366 Enclosing_Body_Present : Boolean := False;
2370 if Scope (Gen_Unit) /= Standard_Standard
2371 and then not Is_Child_Unit (Gen_Unit)
2373 Scop := Scope (Gen_Unit);
2375 while Present (Scop)
2376 and then Scop /= Standard_Standard
2378 if Unit_Requires_Body (Scop) then
2379 Enclosing_Body_Present := True;
2383 Scop := Scope (Scop);
2387 -- If front-end inlining is enabled, and this is a unit for which
2388 -- code will be generated, we instantiate the body at once.
2389 -- This is done if the instance is not the main unit, and if the
2390 -- generic is not a child unit, to avoid scope problems.
2392 if Front_End_Inlining
2393 and then Expander_Active
2394 and then not Is_Child_Unit (Gen_Unit)
2395 and then Is_In_Main_Unit (N)
2396 and then Nkind (Parent (N)) /= N_Compilation_Unit
2397 and then Might_Inline_Subp
2403 (Unit_Requires_Body (Gen_Unit)
2404 or else Enclosing_Body_Present
2405 or else Present (Corresponding_Body (Gen_Decl)))
2406 and then (Is_In_Main_Unit (N)
2407 or else Might_Inline_Subp)
2408 and then not Is_Actual_Pack
2409 and then not Inline_Now
2411 and then (Operating_Mode = Generate_Code
2412 or else (Operating_Mode = Check_Semantics
2413 and then Tree_Output));
2415 -- If front_end_inlining is enabled, do not instantiate a
2416 -- body if within a generic context.
2418 if Front_End_Inlining
2419 and then not Expander_Active
2421 Needs_Body := False;
2426 -- If we are generating the calling stubs from the instantiation
2427 -- of a generic RCI package, we will not use the body of the
2430 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2431 and then Is_Compilation_Unit (Defining_Entity (N))
2433 Needs_Body := False;
2438 -- Here is a defence against a ludicrous number of instantiations
2439 -- caused by a circular set of instantiation attempts.
2441 if Pending_Instantiations.Last >
2442 Hostparm.Max_Instantiations
2444 Error_Msg_N ("too many instantiations", N);
2445 raise Unrecoverable_Error;
2448 -- Indicate that the enclosing scopes contain an instantiation,
2449 -- and that cleanup actions should be delayed until after the
2450 -- instance body is expanded.
2452 Check_Forward_Instantiation (N, Gen_Decl);
2453 if Nkind (N) = N_Package_Instantiation then
2455 Enclosing_Master : Entity_Id := Current_Scope;
2458 while Enclosing_Master /= Standard_Standard loop
2460 if Ekind (Enclosing_Master) = E_Package then
2461 if Is_Compilation_Unit (Enclosing_Master) then
2462 if In_Package_Body (Enclosing_Master) then
2464 (Body_Entity (Enclosing_Master));
2473 Enclosing_Master := Scope (Enclosing_Master);
2476 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2477 Enclosing_Master := Scope (Enclosing_Master);
2479 elsif Ekind (Enclosing_Master) = E_Generic_Function
2480 or else Ekind (Enclosing_Master) = E_Generic_Procedure
2481 or else Ekind (Enclosing_Master) = E_Void
2483 -- Cleanup actions will eventually be performed on
2484 -- the enclosing instance, if any. enclosing scope
2485 -- is void in the formal part of a generic subp.
2490 if Ekind (Enclosing_Master) = E_Entry
2492 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2495 Protected_Body_Subprogram (Enclosing_Master);
2498 Set_Delay_Cleanups (Enclosing_Master);
2500 while Ekind (Enclosing_Master) = E_Block loop
2501 Enclosing_Master := Scope (Enclosing_Master);
2504 if Is_Subprogram (Enclosing_Master) then
2505 Delay_Descriptors (Enclosing_Master);
2507 elsif Is_Task_Type (Enclosing_Master) then
2509 TBP : constant Node_Id :=
2510 Get_Task_Body_Procedure
2514 if Present (TBP) then
2515 Delay_Descriptors (TBP);
2516 Set_Delay_Cleanups (TBP);
2526 -- Make entry in table
2528 Pending_Instantiations.Increment_Last;
2529 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2530 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2534 Set_Categorization_From_Pragmas (Act_Decl);
2536 if Parent_Installed then
2540 Set_Instance_Spec (N, Act_Decl);
2542 -- Case of not a compilation unit
2544 if Nkind (Parent (N)) /= N_Compilation_Unit then
2545 Mark_Rewrite_Insertion (Act_Decl);
2546 Insert_Before (N, Act_Decl);
2549 -- Case of compilation unit that is generic instantiation
2551 -- Place declaration on current node so context is complete
2552 -- for analysis (including nested instantiations).
2555 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2557 -- The entity for the current unit is the newly created one,
2558 -- and all semantic information is attached to it.
2560 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2562 -- If this is the main unit, replace the main entity as well.
2564 if Current_Sem_Unit = Main_Unit then
2565 Main_Unit_Entity := Act_Decl_Id;
2569 Set_Unit (Parent (N), Act_Decl);
2570 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2572 Set_Unit (Parent (N), N);
2573 Set_Body_Required (Parent (N), False);
2575 -- We never need elaboration checks on instantiations, since
2576 -- by definition, the body instantiation is elaborated at the
2577 -- same time as the spec instantiation.
2579 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2580 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2583 Check_Elab_Instantiation (N);
2585 if ABE_Is_Certain (N) and then Needs_Body then
2586 Pending_Instantiations.Decrement_Last;
2588 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2590 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2591 First_Private_Entity (Act_Decl_Id));
2593 if Nkind (Parent (N)) = N_Compilation_Unit
2594 and then not Needs_Body
2596 Rewrite (N, Act_Decl);
2599 if Present (Corresponding_Body (Gen_Decl))
2600 or else Unit_Requires_Body (Gen_Unit)
2602 Set_Has_Completion (Act_Decl_Id);
2605 Check_Formal_Packages (Act_Decl_Id);
2607 Restore_Private_Views (Act_Decl_Id);
2609 if not Generic_Separately_Compiled (Gen_Unit) then
2610 Inherit_Context (Gen_Decl, N);
2613 if Parent_Installed then
2620 Validate_Categorization_Dependency (N, Act_Decl_Id);
2622 -- Check restriction, but skip this if something went wrong in
2623 -- the above analysis, indicated by Act_Decl_Id being void.
2625 if Ekind (Act_Decl_Id) /= E_Void
2626 and then not Is_Library_Level_Entity (Act_Decl_Id)
2628 Check_Restriction (No_Local_Allocators, N);
2632 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2636 when Instantiation_Error =>
2637 if Parent_Installed then
2641 end Analyze_Package_Instantiation;
2643 ---------------------------
2644 -- Inline_Instance_Body --
2645 ---------------------------
2647 procedure Inline_Instance_Body
2649 Gen_Unit : Entity_Id;
2653 Gen_Comp : constant Entity_Id :=
2654 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2655 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2656 Curr_Scope : Entity_Id := Empty;
2657 Curr_Unit : constant Entity_Id :=
2658 Cunit_Entity (Current_Sem_Unit);
2659 Removed : Boolean := False;
2660 Num_Scopes : Int := 0;
2661 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2662 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2663 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2664 Num_Inner : Int := 0;
2665 N_Instances : Int := 0;
2669 -- Case of generic unit defined in another unit
2671 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2672 Vis := Is_Immediately_Visible (Gen_Comp);
2677 and then S /= Standard_Standard
2679 Num_Scopes := Num_Scopes + 1;
2681 Use_Clauses (Num_Scopes) :=
2683 (Scope_Stack.Last - Num_Scopes + 1).
2685 End_Use_Clauses (Use_Clauses (Num_Scopes));
2687 exit when Is_Generic_Instance (S)
2688 and then (In_Package_Body (S)
2689 or else Ekind (S) = E_Procedure
2690 or else Ekind (S) = E_Function);
2694 -- Find and save all enclosing instances.
2699 and then S /= Standard_Standard
2701 if Is_Generic_Instance (S) then
2702 N_Instances := N_Instances + 1;
2703 Instances (N_Instances) := S;
2709 -- Remove context of current compilation unit, unless we
2710 -- are within a nested package instantiation, in which case
2711 -- the context has been removed previously.
2712 -- If current scope is the body of a child unit, remove context
2718 and then S /= Standard_Standard
2720 exit when Is_Generic_Instance (S)
2721 and then (In_Package_Body (S)
2722 or else Ekind (S) = E_Procedure
2723 or else Ekind (S) = E_Function);
2726 or else (Ekind (Curr_Unit) = E_Package_Body
2727 and then S = Spec_Entity (Curr_Unit))
2731 -- Remove entities in current scopes from visibility, so
2732 -- than instance body is compiled in a clean environment.
2736 if Is_Child_Unit (S) then
2737 -- Remove child unit from stack, as well as inner scopes.
2738 -- Removing the context of a child unit removes parent
2741 while Current_Scope /= S loop
2742 Num_Inner := Num_Inner + 1;
2743 Inner_Scopes (Num_Inner) := Current_Scope;
2748 Remove_Context (Curr_Comp);
2752 Remove_Context (Curr_Comp);
2755 if Ekind (Curr_Unit) = E_Package_Body then
2756 Remove_Context (Library_Unit (Curr_Comp));
2763 New_Scope (Standard_Standard);
2764 Instantiate_Package_Body
2765 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2771 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2773 -- Reset Generic_Instance flag so that use clauses can be installed
2774 -- in the proper order. (See Use_One_Package for effect of enclosing
2775 -- instances on processing of use clauses).
2777 for J in 1 .. N_Instances loop
2778 Set_Is_Generic_Instance (Instances (J), False);
2782 Install_Context (Curr_Comp);
2784 if Present (Curr_Scope)
2785 and then Is_Child_Unit (Curr_Scope)
2787 New_Scope (Curr_Scope);
2788 Set_Is_Immediately_Visible (Curr_Scope);
2790 -- Finally, restore inner scopes as well.
2792 for J in reverse 1 .. Num_Inner loop
2793 New_Scope (Inner_Scopes (J));
2797 Restore_Scope_Stack;
2800 for J in reverse 1 .. Num_Scopes loop
2801 Install_Use_Clauses (Use_Clauses (J));
2804 for J in 1 .. N_Instances loop
2805 Set_Is_Generic_Instance (Instances (J), True);
2808 -- If generic unit is in current unit, current context is correct.
2811 Instantiate_Package_Body
2812 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2814 end Inline_Instance_Body;
2816 -------------------------------------
2817 -- Analyze_Procedure_Instantiation --
2818 -------------------------------------
2820 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
2822 Analyze_Subprogram_Instantiation (N, E_Procedure);
2823 end Analyze_Procedure_Instantiation;
2825 --------------------------------------
2826 -- Analyze_Subprogram_Instantiation --
2827 --------------------------------------
2829 procedure Analyze_Subprogram_Instantiation
2833 Loc : constant Source_Ptr := Sloc (N);
2834 Gen_Id : constant Node_Id := Name (N);
2836 Act_Decl_Id : Entity_Id;
2837 Anon_Id : Entity_Id :=
2838 Make_Defining_Identifier
2839 (Sloc (Defining_Entity (N)),
2841 (Chars (Defining_Entity (N)), 'R'));
2846 Gen_Unit : Entity_Id;
2848 Pack_Id : Entity_Id;
2849 Parent_Installed : Boolean := False;
2850 Renaming_List : List_Id;
2853 procedure Analyze_Instance_And_Renamings;
2854 -- The instance must be analyzed in a context that includes the
2855 -- mappings of generic parameters into actuals. We create a package
2856 -- declaration for this purpose, and a subprogram with an internal
2857 -- name within the package. The subprogram instance is simply an
2858 -- alias for the internal subprogram, declared in the current scope.
2860 ------------------------------------
2861 -- Analyze_Instance_And_Renamings --
2862 ------------------------------------
2864 procedure Analyze_Instance_And_Renamings is
2865 Def_Ent : constant Entity_Id := Defining_Entity (N);
2866 Pack_Decl : Node_Id;
2869 if Nkind (Parent (N)) = N_Compilation_Unit then
2871 -- For the case of a compilation unit, the container package
2872 -- has the same name as the instantiation, to insure that the
2873 -- binder calls the elaboration procedure with the right name.
2874 -- Copy the entity of the instance, which may have compilation
2875 -- level flags (eg. is_child_unit) set.
2877 Pack_Id := New_Copy (Def_Ent);
2880 -- Otherwise we use the name of the instantiation concatenated
2881 -- with its source position to ensure uniqueness if there are
2882 -- several instantiations with the same name.
2885 Make_Defining_Identifier (Loc,
2886 Chars => New_External_Name
2887 (Related_Id => Chars (Def_Ent),
2889 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
2892 Pack_Decl := Make_Package_Declaration (Loc,
2893 Specification => Make_Package_Specification (Loc,
2894 Defining_Unit_Name => Pack_Id,
2895 Visible_Declarations => Renaming_List,
2896 End_Label => Empty));
2898 Set_Instance_Spec (N, Pack_Decl);
2899 Set_Is_Generic_Instance (Pack_Id);
2901 -- Case of not a compilation unit
2903 if Nkind (Parent (N)) /= N_Compilation_Unit then
2904 Mark_Rewrite_Insertion (Pack_Decl);
2905 Insert_Before (N, Pack_Decl);
2906 Set_Has_Completion (Pack_Id);
2908 -- Case of an instantiation that is a compilation unit
2910 -- Place declaration on current node so context is complete
2911 -- for analysis (including nested instantiations), and for
2912 -- use in a context_clause (see Analyze_With_Clause).
2915 Set_Unit (Parent (N), Pack_Decl);
2916 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
2919 Analyze (Pack_Decl);
2920 Check_Formal_Packages (Pack_Id);
2921 Set_Is_Generic_Instance (Pack_Id, False);
2923 -- Body of the enclosing package is supplied when instantiating
2924 -- the subprogram body, after semantic analysis is completed.
2926 if Nkind (Parent (N)) = N_Compilation_Unit then
2928 -- Remove package itself from visibility, so it does not
2929 -- conflict with subprogram.
2931 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
2933 -- Set name and scope of internal subprogram so that the
2934 -- proper external name will be generated. The proper scope
2935 -- is the scope of the wrapper package.
2937 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
2938 Set_Scope (Anon_Id, Scope (Pack_Id));
2941 Set_Is_Generic_Instance (Anon_Id);
2942 Act_Decl_Id := New_Copy (Anon_Id);
2944 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
2945 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
2946 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
2947 Set_Comes_From_Source (Act_Decl_Id, True);
2949 -- The signature may involve types that are not frozen yet, but
2950 -- the subprogram will be frozen at the point the wrapper package
2951 -- is frozen, so it does not need its own freeze node. In fact, if
2952 -- one is created, it might conflict with the freezing actions from
2953 -- the wrapper package (see 7206-013).
2955 Set_Has_Delayed_Freeze (Anon_Id, False);
2957 -- If the instance is a child unit, mark the Id accordingly. Mark
2958 -- the anonymous entity as well, which is the real subprogram and
2959 -- which is used when the instance appears in a context clause.
2961 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
2962 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
2963 New_Overloaded_Entity (Act_Decl_Id);
2964 Check_Eliminated (Act_Decl_Id);
2966 -- In compilation unit case, kill elaboration checks on the
2967 -- instantiation, since they are never needed -- the body is
2968 -- instantiated at the same point as the spec.
2970 if Nkind (Parent (N)) = N_Compilation_Unit then
2971 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2972 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2973 Set_Is_Compilation_Unit (Anon_Id);
2975 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
2978 -- The instance is not a freezing point for the new subprogram.
2980 Set_Is_Frozen (Act_Decl_Id, False);
2982 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
2983 Valid_Operator_Definition (Act_Decl_Id);
2986 Set_Alias (Act_Decl_Id, Anon_Id);
2987 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
2988 Set_Has_Completion (Act_Decl_Id);
2989 Set_Related_Instance (Pack_Id, Act_Decl_Id);
2991 if Nkind (Parent (N)) = N_Compilation_Unit then
2992 Set_Body_Required (Parent (N), False);
2995 end Analyze_Instance_And_Renamings;
2997 -- Start of processing for Analyze_Subprogram_Instantiation
3000 -- Very first thing: apply the special kludge for Text_IO processing
3001 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3002 -- Of course such an instantiation is bogus (these are packages, not
3003 -- subprograms), but we get a better error message if we do this.
3005 Text_IO_Kludge (Gen_Id);
3007 -- Make node global for error reporting.
3009 Instantiation_Node := N;
3010 Pre_Analyze_Actuals (N);
3012 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3013 Gen_Unit := Entity (Gen_Id);
3015 Generate_Reference (Gen_Unit, Gen_Id);
3017 if Nkind (Gen_Id) = N_Identifier
3018 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3021 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3024 if Etype (Gen_Unit) = Any_Type then return; end if;
3026 -- Verify that it is a generic subprogram of the right kind, and that
3027 -- it does not lead to a circular instantiation.
3029 if Ekind (Gen_Unit) /= E_Generic_Procedure
3030 and then Ekind (Gen_Unit) /= E_Generic_Function
3032 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3034 elsif In_Open_Scopes (Gen_Unit) then
3035 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3037 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3038 Error_Msg_Node_2 := Current_Scope;
3040 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3041 Circularity_Detected := True;
3043 elsif K = E_Procedure
3044 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3046 if Ekind (Gen_Unit) = E_Generic_Function then
3048 ("cannot instantiate generic function as procedure", Gen_Id);
3051 ("expect name of generic procedure in instantiation", Gen_Id);
3054 elsif K = E_Function
3055 and then Ekind (Gen_Unit) /= E_Generic_Function
3057 if Ekind (Gen_Unit) = E_Generic_Procedure then
3059 ("cannot instantiate generic procedure as function", Gen_Id);
3062 ("expect name of generic function in instantiation", Gen_Id);
3066 -- If renaming, indicate that this is instantiation of renamed unit
3068 if Present (Renamed_Object (Gen_Unit))
3069 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3071 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3073 Gen_Unit := Renamed_Object (Gen_Unit);
3074 Set_Entity (Gen_Id, Gen_Unit);
3077 if In_Extended_Main_Source_Unit (N) then
3078 Set_Is_Instantiated (Gen_Unit);
3079 Generate_Reference (Gen_Unit, N);
3082 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3083 Spec := Specification (Gen_Decl);
3085 -- The subprogram itself cannot contain a nested instance, so
3086 -- the current parent is left empty.
3088 Save_Env (Gen_Unit, Empty);
3090 -- Initialize renamings map, for error checking.
3092 Generic_Renamings.Set_Last (0);
3093 Generic_Renamings_HTable.Reset;
3095 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
3097 -- Copy original generic tree, to produce text for instantiation.
3101 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3103 Act_Spec := Specification (Act_Tree);
3105 Analyze_Associations
3107 Generic_Formal_Declarations (Act_Tree),
3108 Generic_Formal_Declarations (Gen_Decl));
3110 -- Build the subprogram declaration, which does not appear
3111 -- in the generic template, and give it a sloc consistent
3112 -- with that of the template.
3114 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3115 Set_Generic_Parent (Act_Spec, Gen_Unit);
3117 Make_Subprogram_Declaration (Sloc (Act_Spec),
3118 Specification => Act_Spec);
3120 Set_Categorization_From_Pragmas (Act_Decl);
3122 if Parent_Installed then
3126 Append (Act_Decl, Renaming_List);
3127 Analyze_Instance_And_Renamings;
3129 -- If the generic is marked Import (Intrinsic), then so is the
3130 -- instance. This indicates that there is no body to instantiate.
3131 -- If generic is marked inline, so it the instance, and the
3132 -- anonymous subprogram it renames. If inlined, or else if inlining
3133 -- is enabled for the compilation, we generate the instance body
3134 -- even if it is not within the main unit.
3136 -- Any other pragmas might also be inherited ???
3138 if Is_Intrinsic_Subprogram (Gen_Unit) then
3139 Set_Is_Intrinsic_Subprogram (Anon_Id);
3140 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3142 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3143 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3147 Generate_Definition (Act_Decl_Id);
3149 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3150 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3152 Check_Elab_Instantiation (N);
3153 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3155 -- Subject to change, pending on if other pragmas are inherited ???
3157 Validate_Categorization_Dependency (N, Act_Decl_Id);
3159 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3161 if not Generic_Separately_Compiled (Gen_Unit) then
3162 Inherit_Context (Gen_Decl, N);
3165 Restore_Private_Views (Pack_Id, False);
3167 -- If the context requires a full instantiation, mark node for
3168 -- subsequent construction of the body.
3170 if (Is_In_Main_Unit (N)
3171 or else Is_Inlined (Act_Decl_Id))
3172 and then (Operating_Mode = Generate_Code
3173 or else (Operating_Mode = Check_Semantics
3174 and then Tree_Output))
3175 and then (Expander_Active or else Tree_Output)
3176 and then not ABE_Is_Certain (N)
3177 and then not Is_Eliminated (Act_Decl_Id)
3179 Pending_Instantiations.Increment_Last;
3180 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3181 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3182 Check_Forward_Instantiation (N, Gen_Decl);
3184 -- The wrapper package is always delayed, because it does
3185 -- not constitute a freeze point, but to insure that the
3186 -- freeze node is placed properly, it is created directly
3187 -- when instantiating the body (otherwise the freeze node
3188 -- might appear to early for nested instantiations).
3190 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3192 -- For ASIS purposes, indicate that the wrapper package has
3193 -- replaced the instantiation node.
3195 Rewrite (N, Unit (Parent (N)));
3196 Set_Unit (Parent (N), N);
3199 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3201 -- Replace instance node for library-level instantiations
3202 -- of intrinsic subprograms, for ASIS use.
3204 Rewrite (N, Unit (Parent (N)));
3205 Set_Unit (Parent (N), N);
3208 if Parent_Installed then
3213 Generic_Renamings.Set_Last (0);
3214 Generic_Renamings_HTable.Reset;
3218 when Instantiation_Error =>
3219 if Parent_Installed then
3223 end Analyze_Subprogram_Instantiation;
3225 -------------------------
3226 -- Get_Associated_Node --
3227 -------------------------
3229 function Get_Associated_Node (N : Node_Id) return Node_Id is
3230 Assoc : Node_Id := Associated_Node (N);
3233 if Nkind (Assoc) /= Nkind (N) then
3236 elsif Nkind (Assoc) = N_Aggregate
3237 or else Nkind (Assoc) = N_Extension_Aggregate
3241 -- If the node is part of an inner generic, it may itself have been
3242 -- remapped into a further generic copy. Associated_Node is otherwise
3243 -- used for the entity of the node, and will be of a different node
3244 -- kind, or else N has been rewritten as a literal or function call.
3246 while Present (Associated_Node (Assoc))
3247 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3249 Assoc := Associated_Node (Assoc);
3252 -- Follow and additional link in case the final node was rewritten.
3253 -- This can only happen with nested generic units.
3255 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3256 and then Present (Associated_Node (Assoc))
3257 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3259 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3261 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3263 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3265 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3267 Assoc := Associated_Node (Assoc);
3272 end Get_Associated_Node;
3274 -------------------------------------------
3275 -- Build_Instance_Compilation_Unit_Nodes --
3276 -------------------------------------------
3278 procedure Build_Instance_Compilation_Unit_Nodes
3283 Decl_Cunit : Node_Id;
3284 Body_Cunit : Node_Id;
3286 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3287 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3290 -- A new compilation unit node is built for the instance declaration
3293 Make_Compilation_Unit (Sloc (N),
3294 Context_Items => Empty_List,
3297 Make_Compilation_Unit_Aux (Sloc (N)));
3299 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3300 Set_Body_Required (Decl_Cunit, True);
3302 -- We use the original instantiation compilation unit as the resulting
3303 -- compilation unit of the instance, since this is the main unit.
3305 Rewrite (N, Act_Body);
3306 Body_Cunit := Parent (N);
3308 -- The two compilation unit nodes are linked by the Library_Unit field
3310 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3311 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3313 -- The context clause items on the instantiation, which are now
3314 -- attached to the body compilation unit (since the body overwrote
3315 -- the original instantiation node), semantically belong on the spec,
3316 -- so copy them there. It's harmless to leave them on the body as well.
3317 -- In fact one could argue that they belong in both places.
3319 Citem := First (Context_Items (Body_Cunit));
3320 while Present (Citem) loop
3321 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3325 -- Propagate categorization flags on packages, so that they appear
3326 -- in ali file for the spec of the unit.
3328 if Ekind (New_Main) = E_Package then
3329 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3330 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3331 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3332 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3333 Set_Is_Remote_Call_Interface
3334 (Old_Main, Is_Remote_Call_Interface (New_Main));
3337 -- Make entry in Units table, so that binder can generate call to
3338 -- elaboration procedure for body, if any.
3340 Make_Instance_Unit (Body_Cunit);
3341 Main_Unit_Entity := New_Main;
3342 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3344 -- Build elaboration entity, since the instance may certainly
3345 -- generate elaboration code requiring a flag for protection.
3347 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3348 end Build_Instance_Compilation_Unit_Nodes;
3350 -----------------------------------
3351 -- Check_Formal_Package_Instance --
3352 -----------------------------------
3354 -- If the formal has specific parameters, they must match those of the
3355 -- actual. Both of them are instances, and the renaming declarations
3356 -- for their formal parameters appear in the same order in both. The
3357 -- analyzed formal has been analyzed in the context of the current
3360 procedure Check_Formal_Package_Instance
3361 (Formal_Pack : Entity_Id;
3362 Actual_Pack : Entity_Id)
3364 E1 : Entity_Id := First_Entity (Actual_Pack);
3365 E2 : Entity_Id := First_Entity (Formal_Pack);
3370 procedure Check_Mismatch (B : Boolean);
3371 -- Common error routine for mismatch between the parameters of
3372 -- the actual instance and those of the formal package.
3374 procedure Check_Mismatch (B : Boolean) is
3378 ("actual for & in actual instance does not match formal",
3379 Parent (Actual_Pack), E1);
3383 -- Start of processing for Check_Formal_Package_Instance
3387 and then Present (E2)
3389 exit when Ekind (E1) = E_Package
3390 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3392 if Is_Type (E1) then
3394 -- Subtypes must statically match. E1 and E2 are the
3395 -- local entities that are subtypes of the actuals.
3396 -- Itypes generated for other parameters need not be checked,
3397 -- the check will be performed on the parameters themselves.
3399 if not Is_Itype (E1)
3400 and then not Is_Itype (E2)
3404 or else Etype (E1) /= Etype (E2)
3405 or else not Subtypes_Statically_Match (E1, E2));
3408 elsif Ekind (E1) = E_Constant then
3410 -- IN parameters must denote the same static value, or
3411 -- the same constant, or the literal null.
3413 Expr1 := Expression (Parent (E1));
3415 if Ekind (E2) /= E_Constant then
3416 Check_Mismatch (True);
3419 Expr2 := Expression (Parent (E2));
3422 if Is_Static_Expression (Expr1) then
3424 if not Is_Static_Expression (Expr2) then
3425 Check_Mismatch (True);
3427 elsif Is_Integer_Type (Etype (E1)) then
3430 V1 : Uint := Expr_Value (Expr1);
3431 V2 : Uint := Expr_Value (Expr2);
3433 Check_Mismatch (V1 /= V2);
3436 elsif Is_Real_Type (Etype (E1)) then
3439 V1 : Ureal := Expr_Value_R (Expr1);
3440 V2 : Ureal := Expr_Value_R (Expr2);
3442 Check_Mismatch (V1 /= V2);
3445 elsif Is_String_Type (Etype (E1))
3446 and then Nkind (Expr1) = N_String_Literal
3449 if Nkind (Expr2) /= N_String_Literal then
3450 Check_Mismatch (True);
3453 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3457 elsif Is_Entity_Name (Expr1) then
3458 if Is_Entity_Name (Expr2) then
3459 if Entity (Expr1) = Entity (Expr2) then
3462 elsif Ekind (Entity (Expr2)) = E_Constant
3463 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3465 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3469 Check_Mismatch (True);
3472 Check_Mismatch (True);
3475 elsif Nkind (Expr1) = N_Null then
3476 Check_Mismatch (Nkind (Expr1) /= N_Null);
3479 Check_Mismatch (True);
3482 elsif Ekind (E1) = E_Variable
3483 or else Ekind (E1) = E_Package
3486 (Ekind (E1) /= Ekind (E2)
3487 or else Renamed_Object (E1) /= Renamed_Object (E2));
3489 elsif Is_Overloadable (E1) then
3491 -- Verify that the names of the entities match.
3492 -- What if actual is an attribute ???
3495 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3498 raise Program_Error;
3505 end Check_Formal_Package_Instance;
3507 ---------------------------
3508 -- Check_Formal_Packages --
3509 ---------------------------
3511 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3513 Formal_P : Entity_Id;
3516 -- Iterate through the declarations in the instance, looking for
3517 -- package renaming declarations that denote instances of formal
3518 -- packages. Stop when we find the renaming of the current package
3519 -- itself. The declaration for a formal package without a box is
3520 -- followed by an internal entity that repeats the instantiation.
3522 E := First_Entity (P_Id);
3523 while Present (E) loop
3524 if Ekind (E) = E_Package then
3525 if Renamed_Object (E) = P_Id then
3528 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3531 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3532 Formal_P := Next_Entity (E);
3533 Check_Formal_Package_Instance (Formal_P, E);
3539 end Check_Formal_Packages;
3541 ---------------------------------
3542 -- Check_Forward_Instantiation --
3543 ---------------------------------
3545 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id) is
3547 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3550 -- The instantiation appears before the generic body if we are in the
3551 -- scope of the unit containing the generic, either in its spec or in
3552 -- the package body. and before the generic body.
3554 if Ekind (Gen_Comp) = E_Package_Body then
3555 Gen_Comp := Spec_Entity (Gen_Comp);
3558 if In_Open_Scopes (Gen_Comp)
3559 and then No (Corresponding_Body (Decl))
3564 and then not Is_Compilation_Unit (S)
3565 and then not Is_Child_Unit (S)
3567 if Ekind (S) = E_Package then
3568 Set_Has_Forward_Instantiation (S);
3574 end Check_Forward_Instantiation;
3576 ---------------------------
3577 -- Check_Generic_Actuals --
3578 ---------------------------
3580 -- The visibility of the actuals may be different between the
3581 -- point of generic instantiation and the instantiation of the body.
3583 procedure Check_Generic_Actuals
3584 (Instance : Entity_Id;
3585 Is_Formal_Box : Boolean)
3591 E := First_Entity (Instance);
3592 while Present (E) loop
3594 and then Nkind (Parent (E)) = N_Subtype_Declaration
3595 and then Scope (Etype (E)) /= Instance
3596 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3598 Check_Private_View (Subtype_Indication (Parent (E)));
3599 Set_Is_Generic_Actual_Type (E, True);
3600 Set_Is_Hidden (E, False);
3602 -- We constructed the generic actual type as a subtype of
3603 -- the supplied type. This means that it normally would not
3604 -- inherit subtype specific attributes of the actual, which
3605 -- is wrong for the generic case.
3607 Astype := Ancestor_Subtype (E);
3611 -- can happen when E is an itype that is the full view of
3612 -- a private type completed, e.g. with a constrained array.
3614 Astype := Base_Type (E);
3617 Set_Size_Info (E, (Astype));
3618 Set_RM_Size (E, RM_Size (Astype));
3619 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3621 if Is_Discrete_Or_Fixed_Point_Type (E) then
3622 Set_RM_Size (E, RM_Size (Astype));
3624 -- In nested instances, the base type of an access actual
3625 -- may itself be private, and need to be exchanged.
3627 elsif Is_Access_Type (E)
3628 and then Is_Private_Type (Etype (E))
3631 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3634 elsif Ekind (E) = E_Package then
3636 -- If this is the renaming for the current instance, we're done.
3637 -- Otherwise it is a formal package. If the corresponding formal
3638 -- was declared with a box, the (instantiations of the) generic
3639 -- formal part are also visible. Otherwise, ignore the entity
3640 -- created to validate the actuals.
3642 if Renamed_Object (E) = Instance then
3645 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3648 -- The visibility of a formal of an enclosing generic is already
3651 elsif Denotes_Formal_Package (E) then
3654 elsif Present (Associated_Formal_Package (E))
3655 and then Box_Present (Parent (Associated_Formal_Package (E)))
3657 Check_Generic_Actuals (Renamed_Object (E), True);
3658 Set_Is_Hidden (E, False);
3662 Set_Is_Hidden (E, not Is_Formal_Box);
3668 end Check_Generic_Actuals;
3670 ------------------------------
3671 -- Check_Generic_Child_Unit --
3672 ------------------------------
3674 procedure Check_Generic_Child_Unit
3676 Parent_Installed : in out Boolean)
3678 Loc : constant Source_Ptr := Sloc (Gen_Id);
3679 Gen_Par : Entity_Id := Empty;
3680 Inst_Par : Entity_Id;
3684 function Find_Generic_Child
3688 -- Search generic parent for possible child unit.
3690 function In_Enclosing_Instance return Boolean;
3691 -- Within an instance of the parent, the child unit may be denoted
3692 -- by a simple name. Examine enclosing scopes to locate a possible
3693 -- parent instantiation.
3695 function Find_Generic_Child
3703 -- If entity of name is already set, instance has already been
3704 -- resolved, e.g. in an enclosing instantiation.
3706 if Present (Entity (Id)) then
3707 if Scope (Entity (Id)) = Scop then
3714 E := First_Entity (Scop);
3715 while Present (E) loop
3716 if Chars (E) = Chars (Id)
3717 and then Is_Child_Unit (E)
3719 if Is_Child_Unit (E)
3720 and then not Is_Visible_Child_Unit (E)
3723 ("generic child unit& is not visible", Gen_Id, E);
3735 end Find_Generic_Child;
3737 function In_Enclosing_Instance return Boolean is
3738 Enclosing_Instance : Node_Id;
3741 Enclosing_Instance := Current_Scope;
3743 while Present (Enclosing_Instance) loop
3744 exit when Ekind (Enclosing_Instance) = E_Package
3745 and then Nkind (Parent (Enclosing_Instance)) =
3746 N_Package_Specification
3748 (Generic_Parent (Parent (Enclosing_Instance)));
3750 Enclosing_Instance := Scope (Enclosing_Instance);
3753 if Present (Enclosing_Instance) then
3754 E := Find_Generic_Child
3755 (Generic_Parent (Parent (Enclosing_Instance)), Gen_Id);
3762 Make_Expanded_Name (Loc,
3764 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
3765 Selector_Name => New_Occurrence_Of (E, Loc)));
3767 Set_Entity (Gen_Id, E);
3768 Set_Etype (Gen_Id, Etype (E));
3769 Parent_Installed := False; -- Already in scope.
3775 end In_Enclosing_Instance;
3777 -- Start of processing for Check_Generic_Child_Unit
3780 -- If the name of the generic is given by a selected component, it
3781 -- may be the name of a generic child unit, and the prefix is the name
3782 -- of an instance of the parent, in which case the child unit must be
3783 -- visible. If this instance is not in scope, it must be placed there
3784 -- and removed after instantiation, because what is being instantiated
3785 -- is not the original child, but the corresponding child present in
3786 -- the instance of the parent.
3788 -- If the child is instantiated within the parent, it can be given by
3789 -- a simple name. In this case the instance is already in scope, but
3790 -- the child generic must be recovered from the generic parent as well.
3792 if Nkind (Gen_Id) = N_Selected_Component then
3793 S := Selector_Name (Gen_Id);
3794 Analyze (Prefix (Gen_Id));
3795 Inst_Par := Entity (Prefix (Gen_Id));
3797 if Ekind (Inst_Par) = E_Package
3798 and then Present (Renamed_Object (Inst_Par))
3800 Inst_Par := Renamed_Object (Inst_Par);
3803 if Ekind (Inst_Par) = E_Package then
3804 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
3805 Gen_Par := Generic_Parent (Parent (Inst_Par));
3807 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
3809 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
3811 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
3814 elsif Ekind (Inst_Par) = E_Generic_Package
3815 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
3818 -- A formal package may be a real child package, and not the
3819 -- implicit instance within a parent. In this case the child is
3820 -- not visible and has to be retrieved explicitly as well.
3822 Gen_Par := Inst_Par;
3825 if Present (Gen_Par) then
3827 -- The prefix denotes an instantiation. The entity itself
3828 -- may be a nested generic, or a child unit.
3830 E := Find_Generic_Child (Gen_Par, S);
3833 Change_Selected_Component_To_Expanded_Name (Gen_Id);
3834 Set_Entity (Gen_Id, E);
3835 Set_Etype (Gen_Id, Etype (E));
3837 Set_Etype (S, Etype (E));
3839 -- Indicate that this is a reference to the parent.
3841 if In_Extended_Main_Source_Unit (Gen_Id) then
3842 Set_Is_Instantiated (Inst_Par);
3845 -- A common mistake is to replicate the naming scheme of
3846 -- a hierarchy by instantiating a generic child directly,
3847 -- rather than the implicit child in a parent instance:
3849 -- generic .. package Gpar is ..
3850 -- generic .. package Gpar.Child is ..
3851 -- package Par is new Gpar ();
3854 -- package Par.Child is new Gpar.Child ();
3855 -- rather than Par.Child
3857 -- In this case the instantiation is within Par, which is
3858 -- an instance, but Gpar does not denote Par because we are
3859 -- not IN the instance of Gpar, so this is illegal. The test
3860 -- below recognizes this particular case.
3862 if Is_Child_Unit (E)
3863 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
3864 and then (not In_Instance
3865 or else Nkind (Parent (Parent (Gen_Id))) =
3869 ("prefix of generic child unit must be instance of parent",
3873 if not In_Open_Scopes (Inst_Par)
3874 and then Nkind (Parent (Gen_Id))
3875 not in N_Generic_Renaming_Declaration
3877 Install_Parent (Inst_Par);
3878 Parent_Installed := True;
3882 -- If the generic parent does not contain an entity that
3883 -- corresponds to the selector, the instance doesn't either.
3884 -- Analyzing the node will yield the appropriate error message.
3885 -- If the entity is not a child unit, then it is an inner
3886 -- generic in the parent.
3894 if Is_Child_Unit (Entity (Gen_Id))
3895 and then Nkind (Parent (Gen_Id))
3896 not in N_Generic_Renaming_Declaration
3897 and then not In_Open_Scopes (Inst_Par)
3899 Install_Parent (Inst_Par);
3900 Parent_Installed := True;
3904 elsif Nkind (Gen_Id) = N_Expanded_Name then
3906 -- Entity already present, analyze prefix, whose meaning may be
3907 -- an instance in the current context. If it is an instance of
3908 -- a relative within another, the proper parent may still have
3909 -- to be installed, if they are not of the same generation.
3911 Analyze (Prefix (Gen_Id));
3912 Inst_Par := Entity (Prefix (Gen_Id));
3914 if In_Enclosing_Instance then
3917 elsif Present (Entity (Gen_Id))
3918 and then Is_Child_Unit (Entity (Gen_Id))
3919 and then not In_Open_Scopes (Inst_Par)
3921 Install_Parent (Inst_Par);
3922 Parent_Installed := True;
3925 elsif In_Enclosing_Instance then
3926 -- The child unit is found in some enclosing scope.
3932 -- If this is the renaming of the implicit child in a parent
3933 -- instance, recover the parent name and install it.
3935 if Is_Entity_Name (Gen_Id) then
3936 E := Entity (Gen_Id);
3938 if Is_Generic_Unit (E)
3939 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
3940 and then Is_Child_Unit (Renamed_Object (E))
3941 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
3942 and then Nkind (Name (Parent (E))) = N_Expanded_Name
3945 New_Copy_Tree (Name (Parent (E))));
3946 Inst_Par := Entity (Prefix (Gen_Id));
3948 if not In_Open_Scopes (Inst_Par) then
3949 Install_Parent (Inst_Par);
3950 Parent_Installed := True;
3953 -- If it is a child unit of a non-generic parent, it may be
3954 -- use-visible and given by a direct name. Install parent as
3957 elsif Is_Generic_Unit (E)
3958 and then Is_Child_Unit (E)
3960 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
3961 and then not Is_Generic_Unit (Scope (E))
3963 if not In_Open_Scopes (Scope (E)) then
3964 Install_Parent (Scope (E));
3965 Parent_Installed := True;
3970 end Check_Generic_Child_Unit;
3972 -----------------------------
3973 -- Check_Hidden_Child_Unit --
3974 -----------------------------
3976 procedure Check_Hidden_Child_Unit
3978 Gen_Unit : Entity_Id;
3979 Act_Decl_Id : Entity_Id)
3981 Gen_Id : Node_Id := Name (N);
3984 if Is_Child_Unit (Gen_Unit)
3985 and then Is_Child_Unit (Act_Decl_Id)
3986 and then Nkind (Gen_Id) = N_Expanded_Name
3987 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
3988 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
3990 Error_Msg_Node_2 := Scope (Act_Decl_Id);
3992 ("generic unit & is implicitly declared in &",
3993 Defining_Unit_Name (N), Gen_Unit);
3994 Error_Msg_N ("\instance must have different name",
3995 Defining_Unit_Name (N));
3997 end Check_Hidden_Child_Unit;
3999 ------------------------
4000 -- Check_Private_View --
4001 ------------------------
4003 procedure Check_Private_View (N : Node_Id) is
4004 T : constant Entity_Id := Etype (N);
4008 -- Exchange views if the type was not private in the generic but is
4009 -- private at the point of instantiation. Do not exchange views if
4010 -- the scope of the type is in scope. This can happen if both generic
4011 -- and instance are sibling units, or if type is defined in a parent.
4012 -- In this case the visibility of the type will be correct for all
4016 BT := Base_Type (T);
4018 if Is_Private_Type (T)
4019 and then not Has_Private_View (N)
4020 and then Present (Full_View (T))
4021 and then not In_Open_Scopes (Scope (T))
4023 -- In the generic, the full type was visible. Save the
4024 -- private entity, for subsequent exchange.
4028 elsif Has_Private_View (N)
4029 and then not Is_Private_Type (T)
4030 and then not Has_Been_Exchanged (T)
4031 and then Etype (Get_Associated_Node (N)) /= T
4033 -- Only the private declaration was visible in the generic. If
4034 -- the type appears in a subtype declaration, the subtype in the
4035 -- instance must have a view compatible with that of its parent,
4036 -- which must be exchanged (see corresponding code in Restore_
4037 -- Private_Views). Otherwise, if the type is defined in a parent
4038 -- unit, leave full visibility within instance, which is safe.
4040 if In_Open_Scopes (Scope (Base_Type (T)))
4041 and then not Is_Private_Type (Base_Type (T))
4042 and then Comes_From_Source (Base_Type (T))
4046 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4047 or else not In_Private_Part (Scope (Base_Type (T)))
4049 Append_Elmt (T, Exchanged_Views);
4050 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4053 -- For composite types with inconsistent representation
4054 -- exchange component types accordingly.
4056 elsif Is_Access_Type (T)
4057 and then Is_Private_Type (Designated_Type (T))
4058 and then Present (Full_View (Designated_Type (T)))
4060 Switch_View (Designated_Type (T));
4062 elsif Is_Array_Type (T)
4063 and then Is_Private_Type (Component_Type (T))
4064 and then not Has_Private_View (N)
4065 and then Present (Full_View (Component_Type (T)))
4067 Switch_View (Component_Type (T));
4069 elsif Is_Private_Type (T)
4070 and then Present (Full_View (T))
4071 and then Is_Array_Type (Full_View (T))
4072 and then Is_Private_Type (Component_Type (Full_View (T)))
4076 -- Finally, a non-private subtype may have a private base type,
4077 -- which must be exchanged for consistency. This can happen when
4078 -- instantiating a package body, when the scope stack is empty but
4079 -- in fact the subtype and the base type are declared in an enclosing
4082 elsif not Is_Private_Type (T)
4083 and then not Has_Private_View (N)
4084 and then Is_Private_Type (Base_Type (T))
4085 and then Present (Full_View (BT))
4086 and then not Is_Generic_Type (BT)
4087 and then not In_Open_Scopes (BT)
4089 Append_Elmt (Full_View (BT), Exchanged_Views);
4090 Exchange_Declarations (BT);
4093 end Check_Private_View;
4095 --------------------------
4096 -- Contains_Instance_Of --
4097 --------------------------
4099 function Contains_Instance_Of
4111 -- Verify that there are no circular instantiations. We check whether
4112 -- the unit contains an instance of the current scope or some enclosing
4113 -- scope (in case one of the instances appears in a subunit). Longer
4114 -- circularities involving subunits might seem too pathological to
4115 -- consider, but they were not too pathological for the authors of
4116 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4117 -- enclosing generic scopes as containing an instance.
4120 -- Within a generic subprogram body, the scope is not generic, to
4121 -- allow for recursive subprograms. Use the declaration to determine
4122 -- whether this is a generic unit.
4124 if Ekind (Scop) = E_Generic_Package
4125 or else (Is_Subprogram (Scop)
4126 and then Nkind (Unit_Declaration_Node (Scop)) =
4127 N_Generic_Subprogram_Declaration)
4129 Elmt := First_Elmt (Inner_Instances (Inner));
4131 while Present (Elmt) loop
4132 if Node (Elmt) = Scop then
4133 Error_Msg_Node_2 := Inner;
4135 ("circular Instantiation: & instantiated within &!",
4139 elsif Node (Elmt) = Inner then
4142 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4143 Error_Msg_Node_2 := Inner;
4145 ("circular Instantiation: & instantiated within &!",
4153 -- Indicate that Inner is being instantiated within Scop.
4155 Append_Elmt (Inner, Inner_Instances (Scop));
4158 if Scop = Standard_Standard then
4161 Scop := Scope (Scop);
4166 end Contains_Instance_Of;
4168 -----------------------
4169 -- Copy_Generic_Node --
4170 -----------------------
4172 function Copy_Generic_Node
4174 Parent_Id : Node_Id;
4175 Instantiating : Boolean)
4181 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4182 -- Check the given value of one of the Fields referenced by the
4183 -- current node to determine whether to copy it recursively. The
4184 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4185 -- value (Sloc, Uint, Char) in which case it need not be copied.
4187 procedure Copy_Descendants;
4188 -- Common utility for various nodes.
4190 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4191 -- Make copy of element list.
4193 function Copy_Generic_List
4195 Parent_Id : Node_Id)
4197 -- Apply Copy_Node recursively to the members of a node list.
4199 -----------------------
4200 -- Copy_Descendants --
4201 -----------------------
4203 procedure Copy_Descendants is
4205 use Atree.Unchecked_Access;
4206 -- This code section is part of the implementation of an untyped
4207 -- tree traversal, so it needs direct access to node fields.
4210 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4211 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4212 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4213 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4214 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4215 end Copy_Descendants;
4217 -----------------------------
4218 -- Copy_Generic_Descendant --
4219 -----------------------------
4221 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4223 if D = Union_Id (Empty) then
4226 elsif D in Node_Range then
4228 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4230 elsif D in List_Range then
4231 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4233 elsif D in Elist_Range then
4234 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4236 -- Nothing else is copyable (e.g. Uint values), return as is
4241 end Copy_Generic_Descendant;
4243 ------------------------
4244 -- Copy_Generic_Elist --
4245 ------------------------
4247 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4254 M := First_Elmt (E);
4255 while Present (M) loop
4257 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4266 end Copy_Generic_Elist;
4268 -----------------------
4269 -- Copy_Generic_List --
4270 -----------------------
4272 function Copy_Generic_List
4274 Parent_Id : Node_Id)
4283 Set_Parent (New_L, Parent_Id);
4286 while Present (N) loop
4287 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4296 end Copy_Generic_List;
4298 -- Start of processing for Copy_Generic_Node
4305 New_N := New_Copy (N);
4307 if Instantiating then
4308 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4311 if not Is_List_Member (N) then
4312 Set_Parent (New_N, Parent_Id);
4315 -- If defining identifier, then all fields have been copied already
4317 if Nkind (New_N) in N_Entity then
4320 -- Special casing for identifiers and other entity names and operators
4322 elsif (Nkind (New_N) = N_Identifier
4323 or else Nkind (New_N) = N_Character_Literal
4324 or else Nkind (New_N) = N_Expanded_Name
4325 or else Nkind (New_N) = N_Operator_Symbol
4326 or else Nkind (New_N) in N_Op)
4328 if not Instantiating then
4330 -- Link both nodes in order to assign subsequently the
4331 -- entity of the copy to the original node, in case this
4332 -- is a global reference.
4334 Set_Associated_Node (N, New_N);
4336 -- If we are within an instantiation, this is a nested generic
4337 -- that has already been analyzed at the point of definition. We
4338 -- must preserve references that were global to the enclosing
4339 -- parent at that point. Other occurrences, whether global or
4340 -- local to the current generic, must be resolved anew, so we
4341 -- reset the entity in the generic copy. A global reference has
4342 -- a smaller depth than the parent, or else the same depth in
4343 -- case both are distinct compilation units.
4345 -- It is also possible for Current_Instantiated_Parent to be
4346 -- defined, and for this not to be a nested generic, namely
4347 -- if the unit is loaded through Rtsfind. In that case, the
4348 -- entity of New_N is only a link to the associated node, and
4349 -- not a defining occurrence.
4351 -- The entities for parent units in the defining_program_unit
4352 -- of a generic child unit are established when the context of
4353 -- the unit is first analyzed, before the generic copy is made.
4354 -- They are preserved in the copy for use in ASIS queries.
4356 Ent := Entity (New_N);
4358 if No (Current_Instantiated_Parent.Gen_Id) then
4360 or else Nkind (Ent) /= N_Defining_Identifier
4361 or else Nkind (Parent (N)) /= N_Defining_Program_Unit_Name
4363 Set_Associated_Node (New_N, Empty);
4368 not (Nkind (Ent) = N_Defining_Identifier
4370 Nkind (Ent) = N_Defining_Character_Literal
4372 Nkind (Ent) = N_Defining_Operator_Symbol)
4373 or else No (Scope (Ent))
4374 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4375 or else (Scope_Depth (Scope (Ent)) >
4376 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4378 Get_Source_Unit (Ent) =
4379 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4381 Set_Associated_Node (New_N, Empty);
4384 -- Case of instantiating identifier or some other name or operator
4387 -- If the associated node is still defined, the entity in
4388 -- it is global, and must be copied to the instance.
4390 if Present (Get_Associated_Node (N)) then
4391 if Nkind (Get_Associated_Node (N)) = Nkind (N) then
4392 Set_Entity (New_N, Entity (Get_Associated_Node (N)));
4393 Check_Private_View (N);
4395 elsif Nkind (Get_Associated_Node (N)) = N_Function_Call then
4396 Set_Entity (New_N, Entity (Name (Get_Associated_Node (N))));
4399 Set_Entity (New_N, Empty);
4404 -- For expanded name, we must copy the Prefix and Selector_Name
4406 if Nkind (N) = N_Expanded_Name then
4409 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4411 Set_Selector_Name (New_N,
4412 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4414 -- For operators, we must copy the right operand
4416 elsif Nkind (N) in N_Op then
4418 Set_Right_Opnd (New_N,
4419 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4421 -- And for binary operators, the left operand as well
4423 if Nkind (N) in N_Binary_Op then
4424 Set_Left_Opnd (New_N,
4425 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4429 -- Special casing for stubs
4431 elsif Nkind (N) in N_Body_Stub then
4433 -- In any case, we must copy the specification or defining
4434 -- identifier as appropriate.
4436 if Nkind (N) = N_Subprogram_Body_Stub then
4437 Set_Specification (New_N,
4438 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4441 Set_Defining_Identifier (New_N,
4443 (Defining_Identifier (N), New_N, Instantiating));
4446 -- If we are not instantiating, then this is where we load and
4447 -- analyze subunits, i.e. at the point where the stub occurs. A
4448 -- more permissivle system might defer this analysis to the point
4449 -- of instantiation, but this seems to complicated for now.
4451 if not Instantiating then
4453 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4455 Unum : Unit_Number_Type;
4461 (Load_Name => Subunit_Name,
4466 -- If the proper body is not found, a warning message will
4467 -- be emitted when analyzing the stub, or later at the the
4468 -- point of instantiation. Here we just leave the stub as is.
4470 if Unum = No_Unit then
4471 Subunits_Missing := True;
4472 goto Subunit_Not_Found;
4475 Subunit := Cunit (Unum);
4477 -- We must create a generic copy of the subunit, in order
4478 -- to perform semantic analysis on it, and we must replace
4479 -- the stub in the original generic unit with the subunit,
4480 -- in order to preserve non-local references within.
4482 -- Only the proper body needs to be copied. Library_Unit and
4483 -- context clause are simply inherited by the generic copy.
4484 -- Note that the copy (which may be recursive if there are
4485 -- nested subunits) must be done first, before attaching it
4486 -- to the enclosing generic.
4490 (Proper_Body (Unit (Subunit)),
4491 Empty, Instantiating => False);
4493 -- Now place the original proper body in the original
4494 -- generic unit. This is a body, not a compilation unit.
4496 Rewrite (N, Proper_Body (Unit (Subunit)));
4497 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4498 Set_Was_Originally_Stub (N);
4500 -- Finally replace the body of the subunit with its copy,
4501 -- and make this new subunit into the library unit of the
4502 -- generic copy, which does not have stubs any longer.
4504 Set_Proper_Body (Unit (Subunit), New_Body);
4505 Set_Library_Unit (New_N, Subunit);
4506 Inherit_Context (Unit (Subunit), N);
4510 -- If we are instantiating, this must be an error case, since
4511 -- otherwise we would have replaced the stub node by the proper
4512 -- body that corresponds. So just ignore it in the copy (i.e.
4513 -- we have copied it, and that is good enough).
4519 <<Subunit_Not_Found>> null;
4521 -- If the node is a compilation unit, it is the subunit of a stub,
4522 -- which has been loaded already (see code below). In this case,
4523 -- the library unit field of N points to the parent unit (which
4524 -- is a compilation unit) and need not (and cannot!) be copied.
4526 -- When the proper body of the stub is analyzed, thie library_unit
4527 -- link is used to establish the proper context (see sem_ch10).
4529 -- The other fields of a compilation unit are copied as usual
4531 elsif Nkind (N) = N_Compilation_Unit then
4533 -- This code can only be executed when not instantiating, because
4534 -- in the copy made for an instantiation, the compilation unit
4535 -- node has disappeared at the point that a stub is replaced by
4538 pragma Assert (not Instantiating);
4540 Set_Context_Items (New_N,
4541 Copy_Generic_List (Context_Items (N), New_N));
4544 Copy_Generic_Node (Unit (N), New_N, False));
4546 Set_First_Inlined_Subprogram (New_N,
4548 (First_Inlined_Subprogram (N), New_N, False));
4550 Set_Aux_Decls_Node (New_N,
4551 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4553 -- For an assignment node, the assignment is known to be semantically
4554 -- legal if we are instantiating the template. This avoids incorrect
4555 -- diagnostics in generated code.
4557 elsif Nkind (N) = N_Assignment_Statement then
4559 -- Copy name and expression fields in usual manner
4562 Copy_Generic_Node (Name (N), New_N, Instantiating));
4564 Set_Expression (New_N,
4565 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4567 if Instantiating then
4568 Set_Assignment_OK (Name (New_N), True);
4571 elsif Nkind (N) = N_Aggregate
4572 or else Nkind (N) = N_Extension_Aggregate
4575 if not Instantiating then
4576 Set_Associated_Node (N, New_N);
4579 if Present (Get_Associated_Node (N))
4580 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4582 -- In the generic the aggregate has some composite type.
4583 -- If at the point of instantiation the type has a private
4584 -- view, install the full view (and that of its ancestors,
4588 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4593 and then Is_Private_Type (T)
4599 and then Is_Tagged_Type (T)
4600 and then Is_Derived_Type (T)
4602 Rt := Root_Type (T);
4607 if Is_Private_Type (T) then
4618 -- Do not copy the associated node, which points to
4619 -- the generic copy of the aggregate.
4622 use Atree.Unchecked_Access;
4623 -- This code section is part of the implementation of an untyped
4624 -- tree traversal, so it needs direct access to node fields.
4627 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4628 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4629 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4630 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4633 -- Allocators do not have an identifier denoting the access type,
4634 -- so we must locate it through the expression to check whether
4635 -- the views are consistent.
4637 elsif Nkind (N) = N_Allocator
4638 and then Nkind (Expression (N)) = N_Qualified_Expression
4639 and then Instantiating
4642 T : Node_Id := Get_Associated_Node (Subtype_Mark (Expression (N)));
4647 -- Retrieve the allocator node in the generic copy.
4649 Acc_T := Etype (Parent (Parent (T)));
4651 and then Is_Private_Type (Acc_T)
4653 Switch_View (Acc_T);
4660 -- For a proper body, we must catch the case of a proper body that
4661 -- replaces a stub. This represents the point at which a separate
4662 -- compilation unit, and hence template file, may be referenced, so
4663 -- we must make a new source instantiation entry for the template
4664 -- of the subunit, and ensure that all nodes in the subunit are
4665 -- adjusted using this new source instantiation entry.
4667 elsif Nkind (N) in N_Proper_Body then
4670 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4673 if Instantiating and then Was_Originally_Stub (N) then
4674 Create_Instantiation_Source
4675 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4678 -- Now copy the fields of the proper body, using the new
4679 -- adjustment factor if one was needed as per test above.
4683 -- Restore the original adjustment factor in case changed
4685 S_Adjustment := Save_Adjustment;
4688 -- Don't copy Ident or Comment pragmas, since the comment belongs
4689 -- to the generic unit, not to the instantiating unit.
4691 elsif Nkind (N) = N_Pragma
4692 and then Instantiating
4695 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4698 if Prag_Id = Pragma_Ident
4699 or else Prag_Id = Pragma_Comment
4701 New_N := Make_Null_Statement (Sloc (N));
4708 -- For the remaining nodes, copy recursively their descendants.
4714 and then Nkind (N) = N_Subprogram_Body
4716 Set_Generic_Parent (Specification (New_N), N);
4721 end Copy_Generic_Node;
4723 ----------------------------
4724 -- Denotes_Formal_Package --
4725 ----------------------------
4727 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4728 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4729 Scop : Entity_Id := Scope (Pack);
4733 if Ekind (Scop) = E_Generic_Package
4734 or else Nkind (Unit_Declaration_Node (Scop))
4735 = N_Generic_Subprogram_Declaration
4739 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4746 -- Check whether this package is associated with a formal
4747 -- package of the enclosing instantiation. Iterate over the
4748 -- list of renamings.
4750 E := First_Entity (Par);
4751 while Present (E) loop
4753 if Ekind (E) /= E_Package
4754 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4757 elsif Renamed_Object (E) = Par then
4760 elsif Renamed_Object (E) = Pack then
4769 end Denotes_Formal_Package;
4775 procedure End_Generic is
4777 -- ??? More things could be factored out in this
4778 -- routine. Should probably be done at a later stage.
4780 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4781 Generic_Flags.Decrement_Last;
4783 Expander_Mode_Restore;
4786 ----------------------
4787 -- Find_Actual_Type --
4788 ----------------------
4790 function Find_Actual_Type
4792 Gen_Scope : Entity_Id)
4798 if not Is_Child_Unit (Gen_Scope) then
4799 return Get_Instance_Of (Typ);
4801 elsif not Is_Generic_Type (Typ)
4802 or else Scope (Typ) = Gen_Scope
4804 return Get_Instance_Of (Typ);
4807 T := Current_Entity (Typ);
4808 while Present (T) loop
4809 if In_Open_Scopes (Scope (T)) then
4818 end Find_Actual_Type;
4820 ----------------------------
4821 -- Freeze_Subprogram_Body --
4822 ----------------------------
4824 procedure Freeze_Subprogram_Body
4825 (Inst_Node : Node_Id;
4827 Pack_Id : Entity_Id)
4830 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
4831 Par : constant Entity_Id := Scope (Gen_Unit);
4836 function Earlier (N1, N2 : Node_Id) return Boolean;
4837 -- Yields True if N1 and N2 appear in the same compilation unit,
4838 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4839 -- traversal of the tree for the unit.
4841 function Enclosing_Body (N : Node_Id) return Node_Id;
4842 -- Find innermost package body that encloses the given node, and which
4843 -- is not a compilation unit. Freeze nodes for the instance, or for its
4844 -- enclosing body, may be inserted after the enclosing_body of the
4847 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4848 -- Find entity for given package body, and locate or create a freeze
4851 function True_Parent (N : Node_Id) return Node_Id;
4852 -- For a subunit, return parent of corresponding stub.
4858 function Earlier (N1, N2 : Node_Id) return Boolean is
4864 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4865 -- Find distance from given node to enclosing compilation unit.
4867 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4870 and then Nkind (P) /= N_Compilation_Unit
4872 P := True_Parent (P);
4878 Find_Depth (P1, D1);
4879 Find_Depth (P2, D2);
4889 P1 := True_Parent (P1);
4894 P2 := True_Parent (P2);
4898 -- At this point P1 and P2 are at the same distance from the root.
4899 -- We examine their parents until we find a common declarative
4900 -- list, at which point we can establish their relative placement
4901 -- by comparing their ultimate slocs. If we reach the root,
4902 -- N1 and N2 do not descend from the same declarative list (e.g.
4903 -- one is nested in the declarative part and the other is in a block
4904 -- in the statement part) and the earlier one is already frozen.
4906 while not Is_List_Member (P1)
4907 or else not Is_List_Member (P2)
4908 or else List_Containing (P1) /= List_Containing (P2)
4910 P1 := True_Parent (P1);
4911 P2 := True_Parent (P2);
4913 if Nkind (Parent (P1)) = N_Subunit then
4914 P1 := Corresponding_Stub (Parent (P1));
4917 if Nkind (Parent (P2)) = N_Subunit then
4918 P2 := Corresponding_Stub (Parent (P2));
4927 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4930 --------------------
4931 -- Enclosing_Body --
4932 --------------------
4934 function Enclosing_Body (N : Node_Id) return Node_Id is
4935 P : Node_Id := Parent (N);
4939 and then Nkind (Parent (P)) /= N_Compilation_Unit
4941 if Nkind (P) = N_Package_Body then
4943 if Nkind (Parent (P)) = N_Subunit then
4944 return Corresponding_Stub (Parent (P));
4950 P := True_Parent (P);
4956 -------------------------
4957 -- Package_Freeze_Node --
4958 -------------------------
4960 function Package_Freeze_Node (B : Node_Id) return Node_Id is
4964 if Nkind (B) = N_Package_Body then
4965 Id := Corresponding_Spec (B);
4967 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
4968 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
4971 Ensure_Freeze_Node (Id);
4972 return Freeze_Node (Id);
4973 end Package_Freeze_Node;
4979 function True_Parent (N : Node_Id) return Node_Id is
4981 if Nkind (Parent (N)) = N_Subunit then
4982 return Parent (Corresponding_Stub (Parent (N)));
4988 -- Start of processing of Freeze_Subprogram_Body
4991 -- If the instance and the generic body appear within the same
4992 -- unit, and the instance preceeds the generic, the freeze node for
4993 -- the instance must appear after that of the generic. If the generic
4994 -- is nested within another instance I2, then current instance must
4995 -- be frozen after I2. In both cases, the freeze nodes are those of
4996 -- enclosing packages. Otherwise, the freeze node is placed at the end
4997 -- of the current declarative part.
4999 Enc_G := Enclosing_Body (Gen_Body);
5000 Enc_I := Enclosing_Body (Inst_Node);
5001 Ensure_Freeze_Node (Pack_Id);
5002 F_Node := Freeze_Node (Pack_Id);
5004 if Is_Generic_Instance (Par)
5005 and then Present (Freeze_Node (Par))
5007 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5009 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5010 -- The parent was a premature instantiation. Insert freeze
5011 -- node at the end the current declarative part.
5013 Insert_After_Last_Decl (Inst_Node, F_Node);
5016 Insert_After (Freeze_Node (Par), F_Node);
5019 -- The body enclosing the instance should be frozen after the body
5020 -- that includes the generic, because the body of the instance may
5021 -- make references to entities therein. If the two are not in the
5022 -- same declarative part, or if the one enclosing the instance is
5023 -- frozen already, freeze the instance at the end of the current
5024 -- declarative part.
5026 elsif Is_Generic_Instance (Par)
5027 and then Present (Freeze_Node (Par))
5028 and then Present (Enc_I)
5030 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5032 (Nkind (Enc_I) = N_Package_Body
5034 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5037 -- The enclosing package may contain several instances. Rather
5038 -- than computing the earliest point at which to insert its
5039 -- freeze node, we place it at the end of the declarative part
5040 -- of the parent of the generic.
5042 Insert_After_Last_Decl
5043 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5046 Insert_After_Last_Decl (Inst_Node, F_Node);
5048 elsif Present (Enc_G)
5049 and then Present (Enc_I)
5050 and then Enc_G /= Enc_I
5051 and then Earlier (Inst_Node, Gen_Body)
5053 if Nkind (Enc_G) = N_Package_Body then
5054 E_G_Id := Corresponding_Spec (Enc_G);
5055 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5057 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5060 -- Freeze package that encloses instance, and place node after
5061 -- package that encloses generic. If enclosing package is already
5062 -- frozen we have to assume it is at the proper place. This may
5063 -- be a potential ABE that requires dynamic checking.
5065 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5067 -- Freeze enclosing subunit before instance
5069 Ensure_Freeze_Node (E_G_Id);
5071 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5072 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5075 Insert_After_Last_Decl (Inst_Node, F_Node);
5079 -- If none of the above, insert freeze node at the end of the
5080 -- current declarative part.
5082 Insert_After_Last_Decl (Inst_Node, F_Node);
5084 end Freeze_Subprogram_Body;
5090 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5092 return Generic_Renamings.Table (E).Gen_Id;
5095 ---------------------
5096 -- Get_Instance_Of --
5097 ---------------------
5099 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5100 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5102 if Res /= Assoc_Null then
5103 return Generic_Renamings.Table (Res).Act_Id;
5105 -- On exit, entity is not instantiated: not a generic parameter,
5106 -- or else parameter of an inner generic unit.
5110 end Get_Instance_Of;
5112 ------------------------------------
5113 -- Get_Package_Instantiation_Node --
5114 ------------------------------------
5116 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5117 Decl : Node_Id := Unit_Declaration_Node (A);
5121 -- If the instantiation is a compilation unit that does not need a
5122 -- body then the instantiation node has been rewritten as a package
5123 -- declaration for the instance, and we return the original node.
5124 -- If it is a compilation unit and the instance node has not been
5125 -- rewritten, then it is still the unit of the compilation.
5126 -- Otherwise the instantiation node appears after the declaration.
5127 -- If the entity is a formal package, the declaration may have been
5128 -- rewritten as a generic declaration (in the case of a formal with a
5129 -- box) or left as a formal package declaration if it has actuals, and
5130 -- is found with a forward search.
5132 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5133 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5134 return Original_Node (Decl);
5136 return Unit (Parent (Decl));
5139 elsif Nkind (Decl) = N_Generic_Package_Declaration
5140 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5142 return Original_Node (Decl);
5145 Inst := Next (Decl);
5146 while Nkind (Inst) /= N_Package_Instantiation
5147 and then Nkind (Inst) /= N_Formal_Package_Declaration
5154 end Get_Package_Instantiation_Node;
5156 ------------------------
5157 -- Has_Been_Exchanged --
5158 ------------------------
5160 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5161 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5164 while Present (Next) loop
5165 if Full_View (Node (Next)) = E then
5173 end Has_Been_Exchanged;
5179 function Hash (F : Entity_Id) return HTable_Range is
5181 return HTable_Range (F mod HTable_Size);
5184 ------------------------
5185 -- Hide_Current_Scope --
5186 ------------------------
5188 procedure Hide_Current_Scope is
5189 C : constant Entity_Id := Current_Scope;
5193 Set_Is_Hidden_Open_Scope (C);
5194 E := First_Entity (C);
5196 while Present (E) loop
5197 if Is_Immediately_Visible (E) then
5198 Set_Is_Immediately_Visible (E, False);
5199 Append_Elmt (E, Hidden_Entities);
5205 -- Make the scope name invisible as well. This is necessary, but
5206 -- might conflict with calls to Rtsfind later on, in case the scope
5207 -- is a predefined one. There is no clean solution to this problem, so
5208 -- for now we depend on the user not redefining Standard itself in one
5209 -- of the parent units.
5211 if Is_Immediately_Visible (C)
5212 and then C /= Standard_Standard
5214 Set_Is_Immediately_Visible (C, False);
5215 Append_Elmt (C, Hidden_Entities);
5218 end Hide_Current_Scope;
5220 ------------------------------
5221 -- In_Same_Declarative_Part --
5222 ------------------------------
5224 function In_Same_Declarative_Part
5229 Decls : Node_Id := Parent (F_Node);
5230 Nod : Node_Id := Parent (Inst);
5233 while Present (Nod) loop
5237 elsif Nkind (Nod) = N_Subprogram_Body
5238 or else Nkind (Nod) = N_Package_Body
5239 or else Nkind (Nod) = N_Task_Body
5240 or else Nkind (Nod) = N_Protected_Body
5241 or else Nkind (Nod) = N_Block_Statement
5245 elsif Nkind (Nod) = N_Subunit then
5246 Nod := Corresponding_Stub (Nod);
5248 elsif Nkind (Nod) = N_Compilation_Unit then
5251 Nod := Parent (Nod);
5256 end In_Same_Declarative_Part;
5258 ---------------------
5259 -- Inherit_Context --
5260 ---------------------
5262 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5263 Current_Context : List_Id;
5264 Current_Unit : Node_Id;
5269 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5271 -- The inherited context is attached to the enclosing compilation
5272 -- unit. This is either the main unit, or the declaration for the
5273 -- main unit (in case the instantation appears within the package
5274 -- declaration and the main unit is its body).
5276 Current_Unit := Parent (Inst);
5277 while Present (Current_Unit)
5278 and then Nkind (Current_Unit) /= N_Compilation_Unit
5280 Current_Unit := Parent (Current_Unit);
5283 Current_Context := Context_Items (Current_Unit);
5285 Item := First (Context_Items (Parent (Gen_Decl)));
5286 while Present (Item) loop
5287 if Nkind (Item) = N_With_Clause then
5288 New_I := New_Copy (Item);
5289 Set_Implicit_With (New_I, True);
5290 Append (New_I, Current_Context);
5296 end Inherit_Context;
5298 ----------------------------
5299 -- Insert_After_Last_Decl --
5300 ----------------------------
5302 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5303 L : List_Id := List_Containing (N);
5304 P : Node_Id := Parent (L);
5307 if not Is_List_Member (F_Node) then
5308 if Nkind (P) = N_Package_Specification
5309 and then L = Visible_Declarations (P)
5310 and then Present (Private_Declarations (P))
5311 and then not Is_Empty_List (Private_Declarations (P))
5313 L := Private_Declarations (P);
5316 Insert_After (Last (L), F_Node);
5318 end Insert_After_Last_Decl;
5324 procedure Install_Body
5325 (Act_Body : Node_Id;
5330 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5331 Act_Unit : constant Node_Id :=
5332 Unit (Cunit (Get_Source_Unit (N)));
5334 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5335 Gen_Unit : constant Node_Id :=
5336 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5337 Orig_Body : Node_Id := Gen_Body;
5338 Par : constant Entity_Id := Scope (Gen_Id);
5339 Body_Unit : Node_Id;
5341 Must_Delay : Boolean;
5343 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5344 -- Find subprogram (if any) that encloses instance and/or generic body.
5346 function True_Sloc (N : Node_Id) return Source_Ptr;
5347 -- If the instance is nested inside a generic unit, the Sloc of the
5348 -- instance indicates the place of the original definition, not the
5349 -- point of the current enclosing instance. Pending a better usage of
5350 -- Slocs to indicate instantiation places, we determine the place of
5351 -- origin of a node by finding the maximum sloc of any ancestor node.
5352 -- Why is this not equivalent fo Top_Level_Location ???
5354 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5355 Scop : Entity_Id := Scope (Id);
5358 while Scop /= Standard_Standard
5359 and then not Is_Overloadable (Scop)
5361 Scop := Scope (Scop);
5367 function True_Sloc (N : Node_Id) return Source_Ptr is
5374 while Present (N1) and then N1 /= Act_Unit loop
5375 if Sloc (N1) > Res then
5385 -- Start of processing for Install_Body
5388 -- If the body is a subunit, the freeze point is the corresponding
5389 -- stub in the current compilation, not the subunit itself.
5391 if Nkind (Parent (Gen_Body)) = N_Subunit then
5392 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5394 Orig_Body := Gen_Body;
5397 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5399 -- If the instantiation and the generic definition appear in the
5400 -- same package declaration, this is an early instantiation.
5401 -- If they appear in the same declarative part, it is an early
5402 -- instantiation only if the generic body appears textually later,
5403 -- and the generic body is also in the main unit.
5405 -- If instance is nested within a subprogram, and the generic body is
5406 -- not, the instance is delayed because the enclosing body is. If
5407 -- instance and body are within the same scope, or the same sub-
5408 -- program body, indicate explicitly that the instance is delayed.
5411 (Gen_Unit = Act_Unit
5412 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5413 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5414 or else (Gen_Unit = Body_Unit
5415 and then True_Sloc (N) < Sloc (Orig_Body)))
5416 and then Is_In_Main_Unit (Gen_Unit)
5417 and then (Scope (Act_Id) = Scope (Gen_Id)
5419 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5421 -- If this is an early instantiation, the freeze node is placed after
5422 -- the generic body. Otherwise, if the generic appears in an instance,
5423 -- we cannot freeze the current instance until the outer one is frozen.
5424 -- This is only relevant if the current instance is nested within some
5425 -- inner scope not itself within the outer instance. If this scope is
5426 -- a package body in the same declarative part as the outer instance,
5427 -- then that body needs to be frozen after the outer instance. Finally,
5428 -- if no delay is needed, we place the freeze node at the end of the
5429 -- current declarative part.
5431 if Expander_Active then
5432 Ensure_Freeze_Node (Act_Id);
5433 F_Node := Freeze_Node (Act_Id);
5436 Insert_After (Orig_Body, F_Node);
5438 elsif Is_Generic_Instance (Par)
5439 and then Present (Freeze_Node (Par))
5440 and then Scope (Act_Id) /= Par
5442 -- Freeze instance of inner generic after instance of enclosing
5445 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5446 Insert_After (Freeze_Node (Par), F_Node);
5448 -- Freeze package enclosing instance of inner generic after
5449 -- instance of enclosing generic.
5451 elsif Nkind (Parent (N)) = N_Package_Body
5452 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5456 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5459 Insert_After_Last_Decl (N, F_Node);
5460 Ensure_Freeze_Node (Enclosing);
5462 if not Is_List_Member (Freeze_Node (Enclosing)) then
5463 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5468 Insert_After_Last_Decl (N, F_Node);
5472 Insert_After_Last_Decl (N, F_Node);
5476 Set_Is_Frozen (Act_Id);
5477 Insert_Before (N, Act_Body);
5478 Mark_Rewrite_Insertion (Act_Body);
5481 --------------------
5482 -- Install_Parent --
5483 --------------------
5485 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5486 S : Entity_Id := Current_Scope;
5487 Inst_Par : Entity_Id;
5488 First_Par : Entity_Id;
5489 Inst_Node : Node_Id;
5490 Gen_Par : Entity_Id;
5491 First_Gen : Entity_Id;
5492 Ancestors : Elist_Id := New_Elmt_List;
5495 procedure Install_Formal_Packages (Par : Entity_Id);
5496 -- If any of the formals of the parent are formal packages with box,
5497 -- their formal parts are visible in the parent and thus in the child
5498 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5499 -- for the unit itself.
5501 procedure Install_Noninstance_Specs (Par : Entity_Id);
5502 -- Install the scopes of noninstance parent units ending with Par.
5504 procedure Install_Spec (Par : Entity_Id);
5505 -- The child unit is within the declarative part of the parent, so
5506 -- the declarations within the parent are immediately visible.
5508 -----------------------------
5509 -- Install_Formal_Packages --
5510 -----------------------------
5512 procedure Install_Formal_Packages (Par : Entity_Id) is
5516 E := First_Entity (Par);
5518 while Present (E) loop
5520 if Ekind (E) = E_Package
5521 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5523 -- If this is the renaming for the parent instance, done.
5525 if Renamed_Object (E) = Par then
5528 -- The visibility of a formal of an enclosing generic is
5531 elsif Denotes_Formal_Package (E) then
5534 elsif Present (Associated_Formal_Package (E))
5535 and then Box_Present (Parent (Associated_Formal_Package (E)))
5537 Check_Generic_Actuals (Renamed_Object (E), True);
5538 Set_Is_Hidden (E, False);
5544 end Install_Formal_Packages;
5546 -------------------------------
5547 -- Install_Noninstance_Specs --
5548 -------------------------------
5550 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5553 and then Par /= Standard_Standard
5554 and then not In_Open_Scopes (Par)
5556 Install_Noninstance_Specs (Scope (Par));
5559 end Install_Noninstance_Specs;
5565 procedure Install_Spec (Par : Entity_Id) is
5566 Spec : constant Node_Id :=
5567 Specification (Unit_Declaration_Node (Par));
5571 Set_Is_Immediately_Visible (Par);
5572 Install_Visible_Declarations (Par);
5573 Install_Private_Declarations (Par);
5574 Set_Use (Visible_Declarations (Spec));
5575 Set_Use (Private_Declarations (Spec));
5578 -- Start of processing for Install_Parent
5581 -- We need to install the parent instance to compile the instantiation
5582 -- of the child, but the child instance must appear in the current
5583 -- scope. Given that we cannot place the parent above the current
5584 -- scope in the scope stack, we duplicate the current scope and unstack
5585 -- both after the instantiation is complete.
5587 -- If the parent is itself the instantiation of a child unit, we must
5588 -- also stack the instantiation of its parent, and so on. Each such
5589 -- ancestor is the prefix of the name in a prior instantiation.
5591 -- If this is a nested instance, the parent unit itself resolves to
5592 -- a renaming of the parent instance, whose declaration we need.
5594 -- Finally, the parent may be a generic (not an instance) when the
5595 -- child unit appears as a formal package.
5599 if Present (Renamed_Entity (Inst_Par)) then
5600 Inst_Par := Renamed_Entity (Inst_Par);
5603 First_Par := Inst_Par;
5606 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5608 First_Gen := Gen_Par;
5610 while Present (Gen_Par)
5611 and then Is_Child_Unit (Gen_Par)
5613 -- Load grandparent instance as well.
5615 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5617 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5618 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5620 if Present (Renamed_Entity (Inst_Par)) then
5621 Inst_Par := Renamed_Entity (Inst_Par);
5626 (Specification (Unit_Declaration_Node (Inst_Par)));
5628 if Present (Gen_Par) then
5629 Prepend_Elmt (Inst_Par, Ancestors);
5632 -- Parent is not the name of an instantiation.
5634 Install_Noninstance_Specs (Inst_Par);
5646 if Present (First_Gen) then
5647 Append_Elmt (First_Par, Ancestors);
5650 Install_Noninstance_Specs (First_Par);
5653 if not Is_Empty_Elmt_List (Ancestors) then
5654 Elmt := First_Elmt (Ancestors);
5656 while Present (Elmt) loop
5657 Install_Spec (Node (Elmt));
5658 Install_Formal_Packages (Node (Elmt));
5669 --------------------------------
5670 -- Instantiate_Formal_Package --
5671 --------------------------------
5673 function Instantiate_Formal_Package
5676 Analyzed_Formal : Node_Id)
5679 Loc : constant Source_Ptr := Sloc (Actual);
5680 Actual_Pack : Entity_Id;
5681 Formal_Pack : Entity_Id;
5682 Gen_Parent : Entity_Id;
5685 Parent_Spec : Node_Id;
5687 function Formal_Entity
5689 Act_Ent : Entity_Id)
5691 -- Returns the entity associated with the given formal F. In the
5692 -- case where F is a formal package, this function will iterate
5693 -- through all of F's formals and enter map associations from the
5694 -- actuals occurring in the formal package's corresponding actual
5695 -- package (obtained via Act_Ent) to the formal package's formal
5696 -- parameters. This function is called recursively for arbitrary
5697 -- levels of formal packages.
5699 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5700 -- Within the generic part, entities in the formal package are
5701 -- visible. To validate subsequent type declarations, indicate
5702 -- the correspondence betwen the entities in the analyzed formal,
5703 -- and the entities in the actual package. There are three packages
5704 -- involved in the instantiation of a formal package: the parent
5705 -- generic P1 which appears in the generic declaration, the fake
5706 -- instantiation P2 which appears in the analyzed generic, and whose
5707 -- visible entities may be used in subsequent formals, and the actual
5708 -- P3 in the instance. To validate subsequent formals, me indicate
5709 -- that the entities in P2 are mapped into those of P3. The mapping of
5710 -- entities has to be done recursively for nested packages.
5716 function Formal_Entity
5718 Act_Ent : Entity_Id)
5721 Orig_Node : Node_Id := F;
5725 when N_Formal_Object_Declaration =>
5726 return Defining_Identifier (F);
5728 when N_Formal_Type_Declaration =>
5729 return Defining_Identifier (F);
5731 when N_Formal_Subprogram_Declaration =>
5732 return Defining_Unit_Name (Specification (F));
5734 when N_Formal_Package_Declaration |
5735 N_Generic_Package_Declaration =>
5737 if Nkind (F) = N_Generic_Package_Declaration then
5738 Orig_Node := Original_Node (F);
5742 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5743 Formal_Node : Node_Id;
5744 Formal_Ent : Entity_Id;
5746 Gen_Decl : Node_Id :=
5747 Unit_Declaration_Node
5748 (Entity (Name (Orig_Node)));
5749 Formals : List_Id :=
5750 Generic_Formal_Declarations (Gen_Decl);
5753 if Present (Formals) then
5754 Formal_Node := First_Non_Pragma (Formals);
5756 Formal_Node := Empty;
5759 -- As for the loop further below, this loop is making
5760 -- a probably invalid assumption about the correspondence
5761 -- between formals and actuals and eventually needs to
5762 -- corrected to account for cases where the formals are
5763 -- not synchronized and in one-to-one correspondence
5764 -- with actuals. ???
5766 -- What is certain is that for a legal program the
5767 -- presence of actual entities guarantees the existing
5770 while Present (Actual_Ent)
5771 and then Present (Formal_Node)
5772 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5774 -- ??? Are the following calls also needed here:
5776 -- Set_Is_Hidden (Actual_Ent, False);
5777 -- Set_Is_Potentially_Use_Visible
5778 -- (Actual_Ent, In_Use (Act_Ent));
5780 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5781 if Present (Formal_Ent) then
5782 Set_Instance_Of (Formal_Ent, Actual_Ent);
5784 Next_Non_Pragma (Formal_Node);
5786 Next_Entity (Actual_Ent);
5790 return Defining_Identifier (Orig_Node);
5792 when N_Use_Package_Clause =>
5795 when N_Use_Type_Clause =>
5798 -- We return Empty for all other encountered forms of
5799 -- declarations because there are some cases of nonformal
5800 -- sorts of declaration that can show up (e.g., when array
5801 -- formals are present). Since it's not clear what kinds
5802 -- can appear among the formals, we won't raise failure here.
5814 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5819 Set_Instance_Of (Form, Act);
5821 E1 := First_Entity (Form);
5822 E2 := First_Entity (Act);
5824 and then E1 /= First_Private_Entity (Form)
5826 if not Is_Internal (E1)
5827 and then not Is_Class_Wide_Type (E1)
5831 and then Chars (E2) /= Chars (E1)
5839 Set_Instance_Of (E1, E2);
5842 and then Is_Tagged_Type (E2)
5845 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5848 if Ekind (E1) = E_Package
5849 and then No (Renamed_Object (E1))
5851 Map_Entities (E1, E2);
5860 -- Start of processing for Instantiate_Formal_Package
5865 if not Is_Entity_Name (Actual)
5866 or else Ekind (Entity (Actual)) /= E_Package
5869 ("expect package instance to instantiate formal", Actual);
5870 Abandon_Instantiation (Actual);
5871 raise Program_Error;
5874 Actual_Pack := Entity (Actual);
5875 Set_Is_Instantiated (Actual_Pack);
5877 -- The actual may be a renamed package, or an outer generic
5878 -- formal package whose instantiation is converted into a renaming.
5880 if Present (Renamed_Object (Actual_Pack)) then
5881 Actual_Pack := Renamed_Object (Actual_Pack);
5884 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5885 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5886 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5889 Generic_Parent (Specification (Analyzed_Formal));
5891 Defining_Unit_Name (Specification (Analyzed_Formal));
5894 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5895 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5897 Parent_Spec := Parent (Actual_Pack);
5900 if Gen_Parent = Any_Id then
5902 ("previous error in declaration of formal package", Actual);
5903 Abandon_Instantiation (Actual);
5906 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5909 ("actual parameter must be instance of&", Actual, Gen_Parent);
5910 Abandon_Instantiation (Actual);
5913 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5914 Map_Entities (Formal_Pack, Actual_Pack);
5917 Make_Package_Renaming_Declaration (Loc,
5918 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5919 Name => New_Reference_To (Actual_Pack, Loc));
5921 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5922 Defining_Identifier (Formal));
5923 Decls := New_List (Nod);
5925 -- If the formal F has a box, then the generic declarations are
5926 -- visible in the generic G. In an instance of G, the corresponding
5927 -- entities in the actual for F (which are the actuals for the
5928 -- instantiation of the generic that F denotes) must also be made
5929 -- visible for analysis of the current instance. On exit from the
5930 -- current instance, those entities are made private again. If the
5931 -- actual is currently in use, these entities are also use-visible.
5933 -- The loop through the actual entities also steps through the
5934 -- formal entities and enters associations from formals to
5935 -- actuals into the renaming map. This is necessary to properly
5936 -- handle checking of actual parameter associations for later
5937 -- formals that depend on actuals declared in the formal package.
5939 -- This processing needs to be reviewed at some point because
5940 -- it is probably not entirely correct as written. For example
5941 -- there may not be a strict one-to-one correspondence between
5942 -- actuals and formals and this loop is currently assuming that
5945 if Box_Present (Formal) then
5947 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
5948 Formal_Node : Node_Id := Empty;
5949 Formal_Ent : Entity_Id;
5950 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
5951 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
5954 if Present (Formals) then
5955 Formal_Node := First_Non_Pragma (Formals);
5958 while Present (Actual_Ent)
5959 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
5961 Set_Is_Hidden (Actual_Ent, False);
5962 Set_Is_Potentially_Use_Visible
5963 (Actual_Ent, In_Use (Actual_Pack));
5965 if Present (Formal_Node) then
5966 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5968 if Present (Formal_Ent) then
5969 Set_Instance_Of (Formal_Ent, Actual_Ent);
5972 Next_Non_Pragma (Formal_Node);
5975 Next_Entity (Actual_Ent);
5979 -- If the formal is not declared with a box, reanalyze it as
5980 -- an instantiation, to verify the matching rules of 12.7. The
5981 -- actual checks are performed after the generic associations
5986 I_Pack : constant Entity_Id :=
5987 Make_Defining_Identifier (Sloc (Actual),
5988 Chars => New_Internal_Name ('P'));
5991 Set_Is_Internal (I_Pack);
5994 Make_Package_Instantiation (Sloc (Actual),
5995 Defining_Unit_Name => I_Pack,
5996 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
5997 Generic_Associations =>
5998 Generic_Associations (Formal)));
6005 end Instantiate_Formal_Package;
6007 -----------------------------------
6008 -- Instantiate_Formal_Subprogram --
6009 -----------------------------------
6011 function Instantiate_Formal_Subprogram
6014 Analyzed_Formal : Node_Id)
6017 Loc : Source_Ptr := Sloc (Instantiation_Node);
6018 Formal_Sub : constant Entity_Id :=
6019 Defining_Unit_Name (Specification (Formal));
6020 Analyzed_S : constant Entity_Id :=
6021 Defining_Unit_Name (Specification (Analyzed_Formal));
6022 Decl_Node : Node_Id;
6026 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6027 -- If the generic is a child unit, the parent has been installed
6028 -- on the scope stack, but a default subprogram cannot resolve to
6029 -- something on the parent because that parent is not really part
6030 -- of the visible context (it is there to resolve explicit local
6031 -- entities). If the default has resolved in this way, we remove
6032 -- the entity from immediate visibility and analyze the node again
6033 -- to emit an error message or find another visible candidate.
6035 procedure Valid_Actual_Subprogram (Act : Node_Id);
6036 -- Perform legality check and raise exception on failure.
6038 -----------------------
6039 -- From_Parent_Scope --
6040 -----------------------
6042 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6043 Gen_Scope : Node_Id := Scope (Analyzed_S);
6046 while Present (Gen_Scope)
6047 and then Is_Child_Unit (Gen_Scope)
6049 if Scope (Subp) = Scope (Gen_Scope) then
6053 Gen_Scope := Scope (Gen_Scope);
6057 end From_Parent_Scope;
6059 -----------------------------
6060 -- Valid_Actual_Subprogram --
6061 -----------------------------
6063 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6065 if not Is_Entity_Name (Act)
6066 and then Nkind (Act) /= N_Operator_Symbol
6067 and then Nkind (Act) /= N_Attribute_Reference
6068 and then Nkind (Act) /= N_Selected_Component
6069 and then Nkind (Act) /= N_Indexed_Component
6070 and then Nkind (Act) /= N_Character_Literal
6071 and then Nkind (Act) /= N_Explicit_Dereference
6073 if Etype (Act) /= Any_Type then
6075 ("Expect subprogram name to instantiate &",
6076 Instantiation_Node, Formal_Sub);
6079 -- In any case, instantiation cannot continue.
6081 Abandon_Instantiation (Instantiation_Node);
6083 end Valid_Actual_Subprogram;
6085 -- Start of processing for Instantiate_Formal_Subprogram
6088 New_Spec := New_Copy_Tree (Specification (Formal));
6090 -- Create new entity for the actual (New_Copy_Tree does not).
6092 Set_Defining_Unit_Name
6093 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6095 -- Find entity of actual. If the actual is an attribute reference, it
6096 -- cannot be resolved here (its formal is missing) but is handled
6097 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6098 -- fully resolved subsequently, when the renaming declaration for the
6099 -- formal is analyzed. If it is an explicit dereference, resolve the
6100 -- prefix but not the actual itself, to prevent interpretation as a
6103 if Present (Actual) then
6104 Loc := Sloc (Actual);
6105 Set_Sloc (New_Spec, Loc);
6107 if Nkind (Actual) = N_Operator_Symbol then
6108 Find_Direct_Name (Actual);
6110 elsif Nkind (Actual) = N_Explicit_Dereference then
6111 Analyze (Prefix (Actual));
6113 elsif Nkind (Actual) /= N_Attribute_Reference then
6117 Valid_Actual_Subprogram (Actual);
6120 elsif Present (Default_Name (Formal)) then
6122 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6123 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6124 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6125 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6126 and then Present (Entity (Default_Name (Formal)))
6128 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6130 Nam := New_Copy (Default_Name (Formal));
6131 Set_Sloc (Nam, Loc);
6134 elsif Box_Present (Formal) then
6136 -- Actual is resolved at the point of instantiation. Create
6137 -- an identifier or operator with the same name as the formal.
6139 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6140 Nam := Make_Operator_Symbol (Loc,
6141 Chars => Chars (Formal_Sub),
6142 Strval => No_String);
6144 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6149 ("missing actual for instantiation of &",
6150 Instantiation_Node, Formal_Sub);
6151 Abandon_Instantiation (Instantiation_Node);
6155 Make_Subprogram_Renaming_Declaration (Loc,
6156 Specification => New_Spec,
6159 -- Gather possible interpretations for the actual before analyzing the
6160 -- instance. If overloaded, it will be resolved when analyzing the
6161 -- renaming declaration.
6163 if Box_Present (Formal)
6164 and then No (Actual)
6168 if Is_Child_Unit (Scope (Analyzed_S))
6169 and then Present (Entity (Nam))
6171 if not Is_Overloaded (Nam) then
6173 if From_Parent_Scope (Entity (Nam)) then
6174 Set_Is_Immediately_Visible (Entity (Nam), False);
6175 Set_Entity (Nam, Empty);
6176 Set_Etype (Nam, Empty);
6180 Set_Is_Immediately_Visible (Entity (Nam));
6189 Get_First_Interp (Nam, I, It);
6191 while Present (It.Nam) loop
6192 if From_Parent_Scope (It.Nam) then
6196 Get_Next_Interp (I, It);
6203 -- The generic instantiation freezes the actual. This can only be
6204 -- done once the actual is resolved, in the analysis of the renaming
6205 -- declaration. To indicate that must be done, we set the corresponding
6206 -- spec of the node to point to the formal subprogram declaration.
6208 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6210 -- We cannot analyze the renaming declaration, and thus find the
6211 -- actual, until the all the actuals are assembled in the instance.
6212 -- For subsequent checks of other actuals, indicate the node that
6213 -- will hold the instance of this formal.
6215 Set_Instance_Of (Analyzed_S, Nam);
6217 if Nkind (Actual) = N_Selected_Component
6218 and then Is_Task_Type (Etype (Prefix (Actual)))
6219 and then not Is_Frozen (Etype (Prefix (Actual)))
6221 -- The renaming declaration will create a body, which must appear
6222 -- outside of the instantiation, We move the renaming declaration
6223 -- out of the instance, and create an additional renaming inside,
6224 -- to prevent freezing anomalies.
6227 Anon_Id : constant Entity_Id :=
6228 Make_Defining_Identifier
6229 (Loc, New_Internal_Name ('E'));
6231 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6232 Insert_Before (Instantiation_Node, Decl_Node);
6233 Analyze (Decl_Node);
6235 -- Now create renaming within the instance.
6238 Make_Subprogram_Renaming_Declaration (Loc,
6239 Specification => New_Copy_Tree (New_Spec),
6240 Name => New_Occurrence_Of (Anon_Id, Loc));
6242 Set_Defining_Unit_Name (Specification (Decl_Node),
6243 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6248 end Instantiate_Formal_Subprogram;
6250 ------------------------
6251 -- Instantiate_Object --
6252 ------------------------
6254 function Instantiate_Object
6257 Analyzed_Formal : Node_Id)
6260 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6261 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6262 Loc : constant Source_Ptr := Sloc (Actual);
6263 Act_Assoc : constant Node_Id := Parent (Actual);
6264 Orig_Ftyp : constant Entity_Id :=
6265 Etype (Defining_Identifier (Analyzed_Formal));
6267 Decl_Node : Node_Id;
6268 Subt_Decl : Node_Id := Empty;
6269 List : List_Id := New_List;
6272 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6273 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6276 Set_Parent (List, Parent (Actual));
6280 if Out_Present (Formal) then
6282 -- An IN OUT generic actual must be a name. The instantiation is
6283 -- a renaming declaration. The actual is the name being renamed.
6284 -- We use the actual directly, rather than a copy, because it is not
6285 -- used further in the list of actuals, and because a copy or a use
6286 -- of relocate_node is incorrect if the instance is nested within
6287 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6288 -- field links the declaration to the generic association.
6292 ("missing actual for instantiation of &",
6293 Instantiation_Node, Formal_Id);
6294 Abandon_Instantiation (Instantiation_Node);
6298 Make_Object_Renaming_Declaration (Loc,
6299 Defining_Identifier => New_Copy (Formal_Id),
6300 Subtype_Mark => New_Copy_Tree (Type_Id),
6303 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6305 -- The analysis of the actual may produce insert_action nodes, so
6306 -- the declaration must have a context in which to attach them.
6308 Append (Decl_Node, List);
6311 -- This check is performed here because Analyze_Object_Renaming
6312 -- will not check it when Comes_From_Source is False. Note
6313 -- though that the check for the actual being the name of an
6314 -- object will be performed in Analyze_Object_Renaming.
6316 if Is_Object_Reference (Actual)
6317 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6320 ("illegal discriminant-dependent component for in out parameter",
6324 -- The actual has to be resolved in order to check that it is
6325 -- a variable (due to cases such as F(1), where F returns
6326 -- access to an array, and for overloaded prefixes).
6329 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6331 if Is_Private_Type (Ftyp)
6332 and then not Is_Private_Type (Etype (Actual))
6333 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6334 or else Base_Type (Etype (Actual)) = Ftyp)
6336 -- If the actual has the type of the full view of the formal,
6337 -- or else a non-private subtype of the formal, then
6338 -- the visibility of the formal type has changed. Add to the
6339 -- actuals a subtype declaration that will force the exchange
6340 -- of views in the body of the instance as well.
6343 Make_Subtype_Declaration (Loc,
6344 Defining_Identifier =>
6345 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6346 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6348 Prepend (Subt_Decl, List);
6350 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6351 Exchange_Declarations (Ftyp);
6354 Resolve (Actual, Ftyp);
6356 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6358 ("actual for& must be a variable", Actual, Formal_Id);
6360 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6362 "type of actual does not match type of&", Actual, Formal_Id);
6366 Note_Possible_Modification (Actual);
6368 -- Check for instantiation of atomic/volatile actual for
6369 -- non-atomic/volatile formal (RM C.6 (12)).
6371 if Is_Atomic_Object (Actual)
6372 and then not Is_Atomic (Orig_Ftyp)
6375 ("cannot instantiate non-atomic formal object " &
6376 "with atomic actual", Actual);
6378 elsif Is_Volatile_Object (Actual)
6379 and then not Is_Volatile (Orig_Ftyp)
6382 ("cannot instantiate non-volatile formal object " &
6383 "with volatile actual", Actual);
6389 -- The instantiation of a generic formal in-parameter
6390 -- is a constant declaration. The actual is the expression for
6391 -- that declaration.
6393 if Present (Actual) then
6395 Decl_Node := Make_Object_Declaration (Loc,
6396 Defining_Identifier => New_Copy (Formal_Id),
6397 Constant_Present => True,
6398 Object_Definition => New_Copy_Tree (Type_Id),
6399 Expression => Actual);
6401 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6403 -- A generic formal object of a tagged type is defined
6404 -- to be aliased so the new constant must also be treated
6408 (Etype (Defining_Identifier (Analyzed_Formal)))
6410 Set_Aliased_Present (Decl_Node);
6413 Append (Decl_Node, List);
6419 (Etype (Defining_Identifier (Analyzed_Formal)));
6421 Freeze_Before (Instantiation_Node, Typ);
6423 -- If the actual is an aggregate, perform name resolution
6424 -- on its components (the analysis of an aggregate does not
6425 -- do it) to capture local names that may be hidden if the
6426 -- generic is a child unit.
6428 if Nkind (Actual) = N_Aggregate then
6429 Pre_Analyze_And_Resolve (Actual, Typ);
6433 elsif Present (Expression (Formal)) then
6435 -- Use default to construct declaration.
6438 Make_Object_Declaration (Sloc (Formal),
6439 Defining_Identifier => New_Copy (Formal_Id),
6440 Constant_Present => True,
6441 Object_Definition => New_Copy (Type_Id),
6442 Expression => New_Copy_Tree (Expression (Formal)));
6444 Append (Decl_Node, List);
6445 Set_Analyzed (Expression (Decl_Node), False);
6449 ("missing actual for instantiation of &",
6450 Instantiation_Node, Formal_Id);
6451 Abandon_Instantiation (Instantiation_Node);
6457 end Instantiate_Object;
6459 ------------------------------
6460 -- Instantiate_Package_Body --
6461 ------------------------------
6463 procedure Instantiate_Package_Body
6464 (Body_Info : Pending_Body_Info)
6466 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6467 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6468 Loc : constant Source_Ptr := Sloc (Inst_Node);
6470 Gen_Id : constant Node_Id := Name (Inst_Node);
6471 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6472 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6473 Act_Spec : constant Node_Id := Specification (Act_Decl);
6474 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6476 Act_Body_Name : Node_Id;
6478 Gen_Body_Id : Node_Id;
6480 Act_Body_Id : Entity_Id;
6482 Parent_Installed : Boolean := False;
6483 Save_Style_Check : Boolean := Style_Check;
6486 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6488 -- The instance body may already have been processed, as the parent
6489 -- of another instance that is inlined. (Load_Parent_Of_Generic).
6491 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
6495 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6497 if No (Gen_Body_Id) then
6498 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6499 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6502 -- Establish global variable for sloc adjustment and for error
6505 Instantiation_Node := Inst_Node;
6507 if Present (Gen_Body_Id) then
6508 Save_Env (Gen_Unit, Act_Decl_Id);
6509 Style_Check := False;
6510 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6512 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6514 Create_Instantiation_Source
6515 (Inst_Node, Gen_Body_Id, S_Adjustment);
6519 (Original_Node (Gen_Body), Empty, Instantiating => True);
6521 -- Build new name (possibly qualified) for body declaration.
6523 Act_Body_Id := New_Copy (Act_Decl_Id);
6525 -- Some attributes of the spec entity are not inherited by the
6528 Set_Handler_Records (Act_Body_Id, No_List);
6530 if Nkind (Defining_Unit_Name (Act_Spec)) =
6531 N_Defining_Program_Unit_Name
6534 Make_Defining_Program_Unit_Name (Loc,
6535 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6536 Defining_Identifier => Act_Body_Id);
6538 Act_Body_Name := Act_Body_Id;
6541 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6543 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6544 Check_Generic_Actuals (Act_Decl_Id, False);
6546 -- If it is a child unit, make the parent instance (which is an
6547 -- instance of the parent of the generic) visible. The parent
6548 -- instance is the prefix of the name of the generic unit.
6550 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6551 and then Nkind (Gen_Id) = N_Expanded_Name
6553 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6554 Parent_Installed := True;
6556 elsif Is_Child_Unit (Gen_Unit) then
6557 Install_Parent (Scope (Gen_Unit), In_Body => True);
6558 Parent_Installed := True;
6561 -- If the instantiation is a library unit, and this is the main
6562 -- unit, then build the resulting compilation unit nodes for the
6563 -- instance. If this is a compilation unit but it is not the main
6564 -- unit, then it is the body of a unit in the context, that is being
6565 -- compiled because it is encloses some inlined unit or another
6566 -- generic unit being instantiated. In that case, this body is not
6567 -- part of the current compilation, and is not attached to the tree,
6568 -- but its parent must be set for analysis.
6570 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6572 if Parent (Inst_Node) = Cunit (Main_Unit) then
6573 Build_Instance_Compilation_Unit_Nodes
6574 (Inst_Node, Act_Body, Act_Decl);
6575 Analyze (Inst_Node);
6577 -- If the instance is a child unit itself, then set the
6578 -- scope of the expanded body to be the parent of the
6579 -- instantiation (ensuring that the fully qualified name
6580 -- will be generated for the elaboration subprogram).
6582 if Nkind (Defining_Unit_Name (Act_Spec)) =
6583 N_Defining_Program_Unit_Name
6586 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6590 Set_Parent (Act_Body, Parent (Inst_Node));
6594 -- Case where instantiation is not a library unit
6597 -- If this is an early instantiation, i.e. appears textually
6598 -- before the corresponding body and must be elaborated first,
6599 -- indicate that the body instance is to be delayed.
6601 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6603 -- Now analyze the body. We turn off all checks if this is
6604 -- an internal unit, since there is no reason to have checks
6605 -- on for any predefined run-time library code. All such
6606 -- code is designed to be compiled with checks off.
6608 -- Note that we do NOT apply this criterion to children of
6609 -- GNAT (or on VMS, children of DEC). The latter units must
6610 -- suppress checks explicitly if this is needed.
6612 if Is_Predefined_File_Name
6613 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6615 Analyze (Act_Body, Suppress => All_Checks);
6621 if not Generic_Separately_Compiled (Gen_Unit) then
6622 Inherit_Context (Gen_Body, Inst_Node);
6625 Restore_Private_Views (Act_Decl_Id);
6627 Style_Check := Save_Style_Check;
6629 -- If we have no body, and the unit requires a body, then complain.
6630 -- This complaint is suppressed if we have detected other errors
6631 -- (since a common reason for missing the body is that it had errors).
6633 elsif Unit_Requires_Body (Gen_Unit) then
6634 if Errors_Detected = 0 then
6636 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6638 -- Don't attempt to perform any cleanup actions if some other
6639 -- error was aready detected, since this can cause blowups.
6645 -- Case of package that does not need a body
6648 -- If the instantiation of the declaration is a library unit,
6649 -- rewrite the original package instantiation as a package
6650 -- declaration in the compilation unit node.
6652 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6653 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6654 Rewrite (Inst_Node, Act_Decl);
6656 -- If the instantiation is not a library unit, then append the
6657 -- declaration to the list of implicitly generated entities.
6658 -- unless it is already a list member which means that it was
6659 -- already processed
6661 elsif not Is_List_Member (Act_Decl) then
6662 Mark_Rewrite_Insertion (Act_Decl);
6663 Insert_Before (Inst_Node, Act_Decl);
6667 Expander_Mode_Restore;
6669 -- Remove the parent instances if they have been placed on the
6670 -- scope stack to compile the body.
6672 if Parent_Installed then
6673 Remove_Parent (In_Body => True);
6675 end Instantiate_Package_Body;
6677 ---------------------------------
6678 -- Instantiate_Subprogram_Body --
6679 ---------------------------------
6681 procedure Instantiate_Subprogram_Body
6682 (Body_Info : Pending_Body_Info)
6684 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6685 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6686 Loc : constant Source_Ptr := Sloc (Inst_Node);
6689 Gen_Id : constant Node_Id := Name (Inst_Node);
6690 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6691 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6692 Anon_Id : constant Entity_Id :=
6693 Defining_Unit_Name (Specification (Act_Decl));
6695 Gen_Body_Id : Node_Id;
6697 Act_Body_Id : Entity_Id;
6698 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6699 Pack_Body : Node_Id;
6700 Prev_Formal : Entity_Id;
6701 Unit_Renaming : Node_Id;
6703 Parent_Installed : Boolean := False;
6704 Save_Style_Check : Boolean := Style_Check;
6707 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6709 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6711 if No (Gen_Body_Id) then
6712 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6713 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6716 Instantiation_Node := Inst_Node;
6718 if Present (Gen_Body_Id) then
6719 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6721 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6723 -- Either body is not present, or context is non-expanding, as
6724 -- when compiling a subunit. Mark the instance as completed.
6726 Set_Has_Completion (Anon_Id);
6730 Save_Env (Gen_Unit, Anon_Id);
6731 Style_Check := False;
6732 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6733 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6737 (Original_Node (Gen_Body), Empty, Instantiating => True);
6738 Act_Body_Id := Defining_Entity (Act_Body);
6739 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6740 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6741 Set_Corresponding_Spec (Act_Body, Anon_Id);
6742 Set_Has_Completion (Anon_Id);
6743 Check_Generic_Actuals (Pack_Id, False);
6745 -- If it is a child unit, make the parent instance (which is an
6746 -- instance of the parent of the generic) visible. The parent
6747 -- instance is the prefix of the name of the generic unit.
6749 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6750 and then Nkind (Gen_Id) = N_Expanded_Name
6752 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6753 Parent_Installed := True;
6755 elsif Is_Child_Unit (Gen_Unit) then
6756 Install_Parent (Scope (Gen_Unit), In_Body => True);
6757 Parent_Installed := True;
6760 -- Inside its body, a reference to the generic unit is a reference
6761 -- to the instance. The corresponding renaming is the first
6762 -- declaration in the body.
6765 Make_Subprogram_Renaming_Declaration (Loc,
6768 Specification (Original_Node (Gen_Body)),
6770 Instantiating => True),
6771 Name => New_Occurrence_Of (Anon_Id, Loc));
6773 -- If there is a formal subprogram with the same name as the
6774 -- unit itself, do not add this renaming declaration. This is
6775 -- a temporary fix for one ACVC test. ???
6777 Prev_Formal := First_Entity (Pack_Id);
6778 while Present (Prev_Formal) loop
6779 if Chars (Prev_Formal) = Chars (Gen_Unit)
6780 and then Is_Overloadable (Prev_Formal)
6785 Next_Entity (Prev_Formal);
6788 if Present (Prev_Formal) then
6789 Decls := New_List (Act_Body);
6791 Decls := New_List (Unit_Renaming, Act_Body);
6794 -- The subprogram body is placed in the body of a dummy package
6795 -- body, whose spec contains the subprogram declaration as well
6796 -- as the renaming declarations for the generic parameters.
6798 Pack_Body := Make_Package_Body (Loc,
6799 Defining_Unit_Name => New_Copy (Pack_Id),
6800 Declarations => Decls);
6802 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6804 -- If the instantiation is a library unit, then build resulting
6805 -- compilation unit nodes for the instance. The declaration of
6806 -- the enclosing package is the grandparent of the subprogram
6807 -- declaration. First replace the instantiation node as the unit
6808 -- of the corresponding compilation.
6810 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6812 if Parent (Inst_Node) = Cunit (Main_Unit) then
6813 Set_Unit (Parent (Inst_Node), Inst_Node);
6814 Build_Instance_Compilation_Unit_Nodes
6815 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6816 Analyze (Inst_Node);
6818 Set_Parent (Pack_Body, Parent (Inst_Node));
6819 Analyze (Pack_Body);
6823 Insert_Before (Inst_Node, Pack_Body);
6824 Mark_Rewrite_Insertion (Pack_Body);
6825 Analyze (Pack_Body);
6827 if Expander_Active then
6828 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6832 if not Generic_Separately_Compiled (Gen_Unit) then
6833 Inherit_Context (Gen_Body, Inst_Node);
6836 Restore_Private_Views (Pack_Id, False);
6838 if Parent_Installed then
6839 Remove_Parent (In_Body => True);
6843 Style_Check := Save_Style_Check;
6845 -- Body not found. Error was emitted already. If there were no
6846 -- previous errors, this may be an instance whose scope is a premature
6847 -- instance. In that case we must insure that the (legal) program does
6848 -- raise program error if executed. We generate a subprogram body for
6849 -- this purpose. See DEC ac30vso.
6851 elsif Errors_Detected = 0
6852 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6854 if Ekind (Anon_Id) = E_Procedure then
6856 Make_Subprogram_Body (Loc,
6858 Make_Procedure_Specification (Loc,
6859 Defining_Unit_Name => New_Copy (Anon_Id),
6860 Parameter_Specifications =>
6862 (Parameter_Specifications (Parent (Anon_Id)))),
6864 Declarations => Empty_List,
6865 Handled_Statement_Sequence =>
6866 Make_Handled_Sequence_Of_Statements (Loc,
6868 New_List (Make_Raise_Program_Error (Loc))));
6871 Make_Subprogram_Body (Loc,
6873 Make_Function_Specification (Loc,
6874 Defining_Unit_Name => New_Copy (Anon_Id),
6875 Parameter_Specifications =>
6877 (Parameter_Specifications (Parent (Anon_Id))),
6879 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6881 Declarations => Empty_List,
6882 Handled_Statement_Sequence =>
6883 Make_Handled_Sequence_Of_Statements (Loc,
6884 Statements => New_List (
6885 Make_Return_Statement (Loc,
6886 Expression => Make_Raise_Program_Error (Loc)))));
6889 Pack_Body := Make_Package_Body (Loc,
6890 Defining_Unit_Name => New_Copy (Pack_Id),
6891 Declarations => New_List (Act_Body));
6893 Insert_After (Inst_Node, Pack_Body);
6894 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6895 Analyze (Pack_Body);
6898 Expander_Mode_Restore;
6899 end Instantiate_Subprogram_Body;
6901 ----------------------
6902 -- Instantiate_Type --
6903 ----------------------
6905 function Instantiate_Type
6908 Analyzed_Formal : Node_Id)
6911 Loc : constant Source_Ptr := Sloc (Actual);
6912 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6913 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6914 Ancestor : Entity_Id;
6915 Def : constant Node_Id := Formal_Type_Definition (Formal);
6917 Decl_Node : Node_Id;
6919 procedure Validate_Array_Type_Instance;
6920 procedure Validate_Access_Subprogram_Instance;
6921 procedure Validate_Access_Type_Instance;
6922 procedure Validate_Derived_Type_Instance;
6923 procedure Validate_Private_Type_Instance;
6924 -- These procedures perform validation tests for the named case
6926 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6927 -- Check that base types are the same and that the subtypes match
6928 -- statically. Used in several of the above.
6930 --------------------
6931 -- Subtypes_Match --
6932 --------------------
6934 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
6935 T : constant Entity_Id := Get_Instance_Of (Gen_T);
6938 return (Base_Type (T) = Base_Type (Act_T)
6939 -- why is the and then commented out here???
6940 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
6941 and then Subtypes_Statically_Match (T, Act_T))
6943 or else (Is_Class_Wide_Type (Gen_T)
6944 and then Is_Class_Wide_Type (Act_T)
6947 Get_Instance_Of (Root_Type (Gen_T)),
6948 Root_Type (Act_T)));
6951 -----------------------------------------
6952 -- Validate_Access_Subprogram_Instance --
6953 -----------------------------------------
6955 procedure Validate_Access_Subprogram_Instance is
6957 if not Is_Access_Type (Act_T)
6958 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
6961 ("expect access type in instantiation of &", Actual, Gen_T);
6962 Abandon_Instantiation (Actual);
6965 Check_Mode_Conformant
6966 (Designated_Type (Act_T),
6967 Designated_Type (A_Gen_T),
6971 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
6972 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
6974 ("protected access type not allowed for formal &",
6978 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
6980 ("expect protected access type for formal &",
6983 end Validate_Access_Subprogram_Instance;
6985 -----------------------------------
6986 -- Validate_Access_Type_Instance --
6987 -----------------------------------
6989 procedure Validate_Access_Type_Instance is
6990 Desig_Type : Entity_Id :=
6991 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
6994 if not Is_Access_Type (Act_T) then
6996 ("expect access type in instantiation of &", Actual, Gen_T);
6997 Abandon_Instantiation (Actual);
7000 if Is_Access_Constant (A_Gen_T) then
7001 if not Is_Access_Constant (Act_T) then
7003 ("actual type must be access-to-constant type", Actual);
7004 Abandon_Instantiation (Actual);
7007 if Is_Access_Constant (Act_T) then
7009 ("actual type must be access-to-variable type", Actual);
7010 Abandon_Instantiation (Actual);
7012 elsif Ekind (A_Gen_T) = E_General_Access_Type
7013 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7015 Error_Msg_N ("actual must be general access type!", Actual);
7016 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7017 Abandon_Instantiation (Actual);
7021 -- The designated subtypes, that is to say the subtypes introduced
7022 -- by an access type declaration (and not by a subtype declaration)
7025 if not Subtypes_Match
7026 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7029 ("designated type of actual does not match that of formal &",
7031 Abandon_Instantiation (Actual);
7033 elsif Is_Access_Type (Designated_Type (Act_T))
7034 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7036 Is_Constrained (Designated_Type (Desig_Type))
7039 ("designated type of actual does not match that of formal &",
7041 Abandon_Instantiation (Actual);
7043 end Validate_Access_Type_Instance;
7045 ----------------------------------
7046 -- Validate_Array_Type_Instance --
7047 ----------------------------------
7049 procedure Validate_Array_Type_Instance is
7054 function Formal_Dimensions return Int;
7055 -- Count number of dimensions in array type formal
7057 function Formal_Dimensions return Int is
7062 if Nkind (Def) = N_Constrained_Array_Definition then
7063 Index := First (Discrete_Subtype_Definitions (Def));
7065 Index := First (Subtype_Marks (Def));
7068 while Present (Index) loop
7074 end Formal_Dimensions;
7076 -- Start of processing for Validate_Array_Type_Instance
7079 if not Is_Array_Type (Act_T) then
7081 ("expect array type in instantiation of &", Actual, Gen_T);
7082 Abandon_Instantiation (Actual);
7084 elsif Nkind (Def) = N_Constrained_Array_Definition then
7085 if not (Is_Constrained (Act_T)) then
7087 ("expect constrained array in instantiation of &",
7089 Abandon_Instantiation (Actual);
7093 if Is_Constrained (Act_T) then
7095 ("expect unconstrained array in instantiation of &",
7097 Abandon_Instantiation (Actual);
7101 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7103 ("dimensions of actual do not match formal &", Actual, Gen_T);
7104 Abandon_Instantiation (Actual);
7107 I1 := First_Index (A_Gen_T);
7108 I2 := First_Index (Act_T);
7109 for J in 1 .. Formal_Dimensions loop
7111 -- If the indices of the actual were given by a subtype_mark,
7112 -- the index was transformed into a range attribute. Retrieve
7113 -- the original type mark for checking.
7115 if Is_Entity_Name (Original_Node (I2)) then
7116 T2 := Entity (Original_Node (I2));
7121 if not Subtypes_Match
7122 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7125 ("index types of actual do not match those of formal &",
7127 Abandon_Instantiation (Actual);
7134 if not Subtypes_Match (
7135 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7136 Component_Type (Act_T))
7139 ("component subtype of actual does not match that of formal &",
7141 Abandon_Instantiation (Actual);
7144 if Has_Aliased_Components (A_Gen_T)
7145 and then not Has_Aliased_Components (Act_T)
7148 ("actual must have aliased components to match formal type &",
7152 end Validate_Array_Type_Instance;
7154 ------------------------------------
7155 -- Validate_Derived_Type_Instance --
7156 ------------------------------------
7158 procedure Validate_Derived_Type_Instance is
7159 Actual_Discr : Entity_Id;
7160 Ancestor_Discr : Entity_Id;
7163 -- If the parent type in the generic declaration is itself
7164 -- a previous formal type, then it is local to the generic
7165 -- and absent from the analyzed generic definition. In that
7166 -- case the ancestor is the instance of the formal (which must
7167 -- have been instantiated previously). Otherwise, the analyzed
7168 -- generic carries the parent type. If the parent type is defined
7169 -- in a previous formal package, then the scope of that formal
7170 -- package is that of the generic type itself, and it has already
7171 -- been mapped into the corresponding type in the actual package.
7173 -- Common case: parent type defined outside of the generic.
7175 if Is_Entity_Name (Subtype_Mark (Def))
7176 and then Present (Entity (Subtype_Mark (Def)))
7178 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7180 -- Check whether parent is defined in a previous formal package.
7183 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7186 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7188 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) then
7190 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7193 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7196 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7198 ("expect type derived from & in instantiation",
7199 Actual, First_Subtype (Ancestor));
7200 Abandon_Instantiation (Actual);
7203 -- Perform atomic/volatile checks (RM C.6(12))
7205 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7207 ("cannot have atomic actual type for non-atomic formal type",
7210 elsif Is_Volatile (Act_T)
7211 and then not Is_Volatile (Ancestor)
7212 and then Is_By_Reference_Type (Ancestor)
7215 ("cannot have volatile actual type for non-volatile formal type",
7219 -- It should not be necessary to check for unknown discriminants
7220 -- on Formal, but for some reason Has_Unknown_Discriminants is
7221 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7222 -- returns False. This needs fixing. ???
7224 if not Is_Indefinite_Subtype (A_Gen_T)
7225 and then not Unknown_Discriminants_Present (Formal)
7226 and then Is_Indefinite_Subtype (Act_T)
7229 ("actual subtype must be constrained", Actual);
7230 Abandon_Instantiation (Actual);
7233 if not Unknown_Discriminants_Present (Formal) then
7234 if Is_Constrained (Ancestor) then
7235 if not Is_Constrained (Act_T) then
7237 ("actual subtype must be constrained", Actual);
7238 Abandon_Instantiation (Actual);
7241 -- Ancestor is unconstrained
7243 elsif Is_Constrained (Act_T) then
7244 if Ekind (Ancestor) = E_Access_Type
7245 or else Is_Composite_Type (Ancestor)
7248 ("actual subtype must be unconstrained", Actual);
7249 Abandon_Instantiation (Actual);
7252 -- A class-wide type is only allowed if the formal has
7253 -- unknown discriminants.
7255 elsif Is_Class_Wide_Type (Act_T)
7256 and then not Has_Unknown_Discriminants (Ancestor)
7259 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7260 Abandon_Instantiation (Actual);
7262 -- Otherwise, the formal and actual shall have the same
7263 -- number of discriminants and each discriminant of the
7264 -- actual must correspond to a discriminant of the formal.
7266 elsif Has_Discriminants (Act_T)
7267 and then Has_Discriminants (Ancestor)
7269 Actual_Discr := First_Discriminant (Act_T);
7270 Ancestor_Discr := First_Discriminant (Ancestor);
7271 while Present (Actual_Discr)
7272 and then Present (Ancestor_Discr)
7274 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7275 not Present (Corresponding_Discriminant (Actual_Discr))
7278 ("discriminant & does not correspond " &
7279 "to ancestor discriminant", Actual, Actual_Discr);
7280 Abandon_Instantiation (Actual);
7283 Next_Discriminant (Actual_Discr);
7284 Next_Discriminant (Ancestor_Discr);
7287 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7289 ("actual for & must have same number of discriminants",
7291 Abandon_Instantiation (Actual);
7294 -- This case should be caught by the earlier check for
7295 -- for constrainedness, but the check here is added for
7298 elsif Has_Discriminants (Act_T) then
7300 ("actual for & must not have discriminants", Actual, Gen_T);
7301 Abandon_Instantiation (Actual);
7303 elsif Has_Discriminants (Ancestor) then
7305 ("actual for & must have known discriminants", Actual, Gen_T);
7306 Abandon_Instantiation (Actual);
7309 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7311 ("constraint on actual is incompatible with formal", Actual);
7312 Abandon_Instantiation (Actual);
7316 end Validate_Derived_Type_Instance;
7318 ------------------------------------
7319 -- Validate_Private_Type_Instance --
7320 ------------------------------------
7322 procedure Validate_Private_Type_Instance is
7323 Formal_Discr : Entity_Id;
7324 Actual_Discr : Entity_Id;
7325 Formal_Subt : Entity_Id;
7328 if (Is_Limited_Type (Act_T)
7329 or else Is_Limited_Composite (Act_T))
7330 and then not Is_Limited_Type (A_Gen_T)
7333 ("actual for non-limited & cannot be a limited type", Actual,
7335 Abandon_Instantiation (Actual);
7337 elsif Is_Indefinite_Subtype (Act_T)
7338 and then not Is_Indefinite_Subtype (A_Gen_T)
7342 ("actual for & must be a definite subtype", Actual, Gen_T);
7344 elsif not Is_Tagged_Type (Act_T)
7345 and then Is_Tagged_Type (A_Gen_T)
7348 ("actual for & must be a tagged type", Actual, Gen_T);
7350 elsif Has_Discriminants (A_Gen_T) then
7351 if not Has_Discriminants (Act_T) then
7353 ("actual for & must have discriminants", Actual, Gen_T);
7354 Abandon_Instantiation (Actual);
7356 elsif Is_Constrained (Act_T) then
7358 ("actual for & must be unconstrained", Actual, Gen_T);
7359 Abandon_Instantiation (Actual);
7362 Formal_Discr := First_Discriminant (A_Gen_T);
7363 Actual_Discr := First_Discriminant (Act_T);
7364 while Formal_Discr /= Empty loop
7365 if Actual_Discr = Empty then
7367 ("discriminants on actual do not match formal",
7369 Abandon_Instantiation (Actual);
7372 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7374 -- access discriminants match if designated types do.
7376 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7377 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7378 = E_Anonymous_Access_Type
7379 and then Get_Instance_Of (
7380 Designated_Type (Base_Type (Formal_Subt)))
7381 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7385 elsif Base_Type (Formal_Subt) /=
7386 Base_Type (Etype (Actual_Discr))
7389 ("types of actual discriminants must match formal",
7391 Abandon_Instantiation (Actual);
7393 elsif not Subtypes_Statically_Match
7394 (Formal_Subt, Etype (Actual_Discr))
7398 ("subtypes of actual discriminants must match formal",
7400 Abandon_Instantiation (Actual);
7403 Next_Discriminant (Formal_Discr);
7404 Next_Discriminant (Actual_Discr);
7407 if Actual_Discr /= Empty then
7409 ("discriminants on actual do not match formal",
7411 Abandon_Instantiation (Actual);
7418 end Validate_Private_Type_Instance;
7420 -- Start of processing for Instantiate_Type
7423 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7424 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7427 elsif not Is_Entity_Name (Actual)
7428 or else not Is_Type (Entity (Actual))
7431 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7432 Abandon_Instantiation (Actual);
7435 Act_T := Entity (Actual);
7437 if Ekind (Act_T) = E_Incomplete_Type then
7438 if No (Underlying_Type (Act_T)) then
7439 Error_Msg_N ("premature use of incomplete type", Actual);
7440 Abandon_Instantiation (Actual);
7442 Act_T := Full_View (Act_T);
7443 Set_Entity (Actual, Act_T);
7445 if Has_Private_Component (Act_T) then
7447 ("premature use of type with private component", Actual);
7451 elsif Is_Private_Type (Act_T)
7452 and then Is_Private_Type (Base_Type (Act_T))
7453 and then not Is_Generic_Type (Act_T)
7454 and then not Is_Derived_Type (Act_T)
7455 and then No (Full_View (Root_Type (Act_T)))
7457 Error_Msg_N ("premature use of private type", Actual);
7459 elsif Has_Private_Component (Act_T) then
7461 ("premature use of type with private component", Actual);
7464 Set_Instance_Of (A_Gen_T, Act_T);
7466 -- If the type is generic, the class-wide type may also be used
7468 if Is_Tagged_Type (A_Gen_T)
7469 and then Is_Tagged_Type (Act_T)
7470 and then not Is_Class_Wide_Type (A_Gen_T)
7472 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7473 Class_Wide_Type (Act_T));
7476 if not Is_Abstract (A_Gen_T)
7477 and then Is_Abstract (Act_T)
7480 ("actual of non-abstract formal cannot be abstract", Actual);
7483 if Is_Scalar_Type (Gen_T) then
7484 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7489 when N_Formal_Private_Type_Definition =>
7490 Validate_Private_Type_Instance;
7492 when N_Formal_Derived_Type_Definition =>
7493 Validate_Derived_Type_Instance;
7495 when N_Formal_Discrete_Type_Definition =>
7496 if not Is_Discrete_Type (Act_T) then
7498 ("expect discrete type in instantiation of&", Actual, Gen_T);
7499 Abandon_Instantiation (Actual);
7502 when N_Formal_Signed_Integer_Type_Definition =>
7503 if not Is_Signed_Integer_Type (Act_T) then
7505 ("expect signed integer type in instantiation of&",
7507 Abandon_Instantiation (Actual);
7510 when N_Formal_Modular_Type_Definition =>
7511 if not Is_Modular_Integer_Type (Act_T) then
7513 ("expect modular type in instantiation of &", Actual, Gen_T);
7514 Abandon_Instantiation (Actual);
7517 when N_Formal_Floating_Point_Definition =>
7518 if not Is_Floating_Point_Type (Act_T) then
7520 ("expect float type in instantiation of &", Actual, Gen_T);
7521 Abandon_Instantiation (Actual);
7524 when N_Formal_Ordinary_Fixed_Point_Definition =>
7525 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7527 ("expect ordinary fixed point type in instantiation of &",
7529 Abandon_Instantiation (Actual);
7532 when N_Formal_Decimal_Fixed_Point_Definition =>
7533 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7535 ("expect decimal type in instantiation of &",
7537 Abandon_Instantiation (Actual);
7540 when N_Array_Type_Definition =>
7541 Validate_Array_Type_Instance;
7543 when N_Access_To_Object_Definition =>
7544 Validate_Access_Type_Instance;
7546 when N_Access_Function_Definition |
7547 N_Access_Procedure_Definition =>
7548 Validate_Access_Subprogram_Instance;
7551 raise Program_Error;
7556 Make_Subtype_Declaration (Loc,
7557 Defining_Identifier => New_Copy (Gen_T),
7558 Subtype_Indication => New_Reference_To (Act_T, Loc));
7560 if Is_Private_Type (Act_T) then
7561 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7564 -- Flag actual derived types so their elaboration produces the
7565 -- appropriate renamings for the primitive operations of the ancestor.
7566 -- Flag actual for formal private types as well, to determine whether
7567 -- operations in the private part may override inherited operations.
7569 if Nkind (Def) = N_Formal_Derived_Type_Definition
7570 or else Nkind (Def) = N_Formal_Private_Type_Definition
7572 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7576 end Instantiate_Type;
7578 ---------------------
7579 -- Is_In_Main_Unit --
7580 ---------------------
7582 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7583 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7585 Current_Unit : Node_Id;
7588 if Unum = Main_Unit then
7591 -- If the current unit is a subunit then it is either the main unit
7592 -- or is being compiled as part of the main unit.
7594 elsif Nkind (N) = N_Compilation_Unit then
7595 return Nkind (Unit (N)) = N_Subunit;
7598 Current_Unit := Parent (N);
7599 while Present (Current_Unit)
7600 and then Nkind (Current_Unit) /= N_Compilation_Unit
7602 Current_Unit := Parent (Current_Unit);
7605 -- The instantiation node is in the main unit, or else the current
7606 -- node (perhaps as the result of nested instantiations) is in the
7607 -- main unit, or in the declaration of the main unit, which in this
7608 -- last case must be a body.
7610 return Unum = Main_Unit
7611 or else Current_Unit = Cunit (Main_Unit)
7612 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7613 or else (Present (Library_Unit (Current_Unit))
7614 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7615 end Is_In_Main_Unit;
7617 ----------------------------
7618 -- Load_Parent_Of_Generic --
7619 ----------------------------
7621 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7622 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7623 True_Parent : Node_Id;
7624 Inst_Node : Node_Id;
7626 Save_Style_Check : Boolean := Style_Check;
7629 if not In_Same_Source_Unit (N, Spec)
7630 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7631 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7632 and then not Is_In_Main_Unit (Spec))
7634 -- Find body of parent of spec, and analyze it. A special case
7635 -- arises when the parent is an instantiation, that is to say when
7636 -- we are currently instantiating a nested generic. In that case,
7637 -- there is no separate file for the body of the enclosing instance.
7638 -- Instead, the enclosing body must be instantiated as if it were
7639 -- a pending instantiation, in order to produce the body for the
7640 -- nested generic we require now. Note that in that case the
7641 -- generic may be defined in a package body, the instance defined
7642 -- in the same package body, and the original enclosing body may not
7643 -- be in the main unit.
7645 True_Parent := Parent (Spec);
7648 while Present (True_Parent)
7649 and then Nkind (True_Parent) /= N_Compilation_Unit
7651 if Nkind (True_Parent) = N_Package_Declaration
7653 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7655 -- Parent is a compilation unit that is an instantiation.
7656 -- Instantiation node has been replaced with package decl.
7658 Inst_Node := Original_Node (True_Parent);
7661 elsif Nkind (True_Parent) = N_Package_Declaration
7662 and then Present (Generic_Parent (Specification (True_Parent)))
7664 -- Parent is an instantiation within another specification.
7665 -- Declaration for instance has been inserted before original
7666 -- instantiation node. A direct link would be preferable?
7668 Inst_Node := Next (True_Parent);
7670 while Present (Inst_Node)
7671 and then Nkind (Inst_Node) /= N_Package_Instantiation
7676 -- If the instance appears within a generic, and the generic
7677 -- unit is defined within a formal package of the enclosing
7678 -- generic, there is no generic body available, and none
7679 -- needed. A more precise test should be used ???
7681 if No (Inst_Node) then
7687 True_Parent := Parent (True_Parent);
7691 if Present (Inst_Node) then
7693 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7695 -- Instantiation node and declaration of instantiated package
7696 -- were exchanged when only the declaration was needed.
7697 -- Restore instantiation node before proceeding with body.
7699 Set_Unit (Parent (True_Parent), Inst_Node);
7702 -- Now complete instantiation of enclosing body, if it appears
7703 -- in some other unit. If it appears in the current unit, the
7704 -- body will have been instantiated already.
7706 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7707 Instantiate_Package_Body
7708 (Pending_Body_Info'(
7709 Inst_Node, True_Parent, Expander_Active,
7710 Get_Code_Unit (Sloc (Inst_Node))));
7714 Opt.Style_Check := False;
7715 Load_Needed_Body (Comp_Unit, OK);
7716 Opt.Style_Check := Save_Style_Check;
7719 and then Unit_Requires_Body (Defining_Entity (Spec))
7722 Bname : constant Unit_Name_Type :=
7723 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7726 Error_Msg_Unit_1 := Bname;
7727 Error_Msg_N ("this instantiation requires$!", N);
7729 Get_File_Name (Bname, Subunit => False);
7730 Error_Msg_N ("\but file{ was not found!", N);
7731 raise Unrecoverable_Error;
7737 -- If loading the parent of the generic caused an instantiation
7738 -- circularity, we abandon compilation at this point, because
7739 -- otherwise in some cases we get into trouble with infinite
7740 -- recursions after this point.
7742 if Circularity_Detected then
7743 raise Unrecoverable_Error;
7746 end Load_Parent_Of_Generic;
7748 -----------------------
7749 -- Move_Freeze_Nodes --
7750 -----------------------
7752 procedure Move_Freeze_Nodes
7753 (Out_Of : Entity_Id;
7758 Next_Decl : Node_Id;
7759 Next_Node : Node_Id := After;
7762 function Is_Outer_Type (T : Entity_Id) return Boolean;
7763 -- Check whether entity is declared in a scope external to that
7764 -- of the generic unit.
7770 function Is_Outer_Type (T : Entity_Id) return Boolean is
7771 Scop : Entity_Id := Scope (T);
7774 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7778 while Scop /= Standard_Standard loop
7780 if Scop = Out_Of then
7783 Scop := Scope (Scop);
7791 -- Start of processing for Move_Freeze_Nodes
7798 -- First remove the freeze nodes that may appear before all other
7802 while Present (Decl)
7803 and then Nkind (Decl) = N_Freeze_Entity
7804 and then Is_Outer_Type (Entity (Decl))
7806 Decl := Remove_Head (L);
7807 Insert_After (Next_Node, Decl);
7808 Set_Analyzed (Decl, False);
7813 -- Next scan the list of declarations and remove each freeze node that
7814 -- appears ahead of the current node.
7816 while Present (Decl) loop
7817 while Present (Next (Decl))
7818 and then Nkind (Next (Decl)) = N_Freeze_Entity
7819 and then Is_Outer_Type (Entity (Next (Decl)))
7821 Next_Decl := Remove_Next (Decl);
7822 Insert_After (Next_Node, Next_Decl);
7823 Set_Analyzed (Next_Decl, False);
7824 Next_Node := Next_Decl;
7827 -- If the declaration is a nested package or concurrent type, then
7828 -- recurse. Nested generic packages will have been processed from the
7831 if Nkind (Decl) = N_Package_Declaration then
7832 Spec := Specification (Decl);
7834 elsif Nkind (Decl) = N_Task_Type_Declaration then
7835 Spec := Task_Definition (Decl);
7837 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7838 Spec := Protected_Definition (Decl);
7844 if Present (Spec) then
7845 Move_Freeze_Nodes (Out_Of, Next_Node,
7846 Visible_Declarations (Spec));
7847 Move_Freeze_Nodes (Out_Of, Next_Node,
7848 Private_Declarations (Spec));
7853 end Move_Freeze_Nodes;
7859 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7861 return Generic_Renamings.Table (E).Next_In_HTable;
7864 ------------------------
7865 -- Preanalyze_Actuals --
7866 ------------------------
7868 procedure Pre_Analyze_Actuals (N : Node_Id) is
7871 Errs : Int := Errors_Detected;
7874 Assoc := First (Generic_Associations (N));
7876 while Present (Assoc) loop
7877 Act := Explicit_Generic_Actual_Parameter (Assoc);
7879 -- Within a nested instantiation, a defaulted actual is an
7880 -- empty association, so nothing to analyze. If the actual for
7881 -- a subprogram is an attribute, analyze prefix only, because
7882 -- actual is not a complete attribute reference.
7883 -- String literals may be operators, but at this point we do not
7884 -- know whether the actual is a formal subprogram or a string.
7889 elsif Nkind (Act) = N_Attribute_Reference then
7890 Analyze (Prefix (Act));
7892 elsif Nkind (Act) = N_Explicit_Dereference then
7893 Analyze (Prefix (Act));
7895 elsif Nkind (Act) /= N_Operator_Symbol then
7899 if Errs /= Errors_Detected then
7900 Abandon_Instantiation (Act);
7905 end Pre_Analyze_Actuals;
7911 procedure Remove_Parent (In_Body : Boolean := False) is
7912 S : Entity_Id := Current_Scope;
7918 -- After child instantiation is complete, remove from scope stack
7919 -- the extra copy of the current scope, and then remove parent
7925 while Current_Scope /= S loop
7927 End_Package_Scope (Current_Scope);
7929 if In_Open_Scopes (P) then
7930 E := First_Entity (P);
7932 while Present (E) loop
7933 Set_Is_Immediately_Visible (E, True);
7937 elsif not In_Open_Scopes (Scope (P)) then
7938 Set_Is_Immediately_Visible (P, False);
7942 -- Reset visibility of entities in the enclosing scope.
7944 Set_Is_Hidden_Open_Scope (Current_Scope, False);
7945 Hidden := First_Elmt (Hidden_Entities);
7947 while Present (Hidden) loop
7948 Set_Is_Immediately_Visible (Node (Hidden), True);
7953 -- Each body is analyzed separately, and there is no context
7954 -- that needs preserving from one body instance to the next,
7955 -- so remove all parent scopes that have been installed.
7957 while Present (S) loop
7958 End_Package_Scope (S);
7960 exit when S = Standard_Standard;
7970 procedure Restore_Env is
7971 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
7974 Ada_83 := Saved.Ada_83;
7976 if No (Current_Instantiated_Parent.Act_Id) then
7978 -- Restore environment after subprogram inlining
7980 Restore_Private_Views (Empty);
7983 Current_Instantiated_Parent := Saved.Instantiated_Parent;
7984 Exchanged_Views := Saved.Exchanged_Views;
7985 Hidden_Entities := Saved.Hidden_Entities;
7986 Current_Sem_Unit := Saved.Current_Sem_Unit;
7988 Instance_Envs.Decrement_Last;
7991 ---------------------------
7992 -- Restore_Private_Views --
7993 ---------------------------
7995 procedure Restore_Private_Views
7996 (Pack_Id : Entity_Id;
7997 Is_Package : Boolean := True)
8006 M := First_Elmt (Exchanged_Views);
8007 while Present (M) loop
8010 -- Subtypes of types whose views have been exchanged, and that
8011 -- are defined within the instance, were not on the list of
8012 -- Private_Dependents on entry to the instance, so they have to
8013 -- be exchanged explicitly now, in order to remain consistent with
8014 -- the view of the parent type.
8016 if Ekind (Typ) = E_Private_Type
8017 or else Ekind (Typ) = E_Limited_Private_Type
8018 or else Ekind (Typ) = E_Record_Type_With_Private
8020 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8022 while Present (Dep_Elmt) loop
8023 Dep_Typ := Node (Dep_Elmt);
8025 if Scope (Dep_Typ) = Pack_Id
8026 and then Present (Full_View (Dep_Typ))
8028 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8029 Exchange_Declarations (Dep_Typ);
8032 Next_Elmt (Dep_Elmt);
8036 Exchange_Declarations (Node (M));
8040 if No (Pack_Id) then
8044 -- Make the generic formal parameters private, and make the formal
8045 -- types into subtypes of the actuals again.
8047 E := First_Entity (Pack_Id);
8049 while Present (E) loop
8050 Set_Is_Hidden (E, True);
8053 and then Nkind (Parent (E)) = N_Subtype_Declaration
8055 Set_Is_Generic_Actual_Type (E, False);
8057 -- An unusual case of aliasing: the actual may also be directly
8058 -- visible in the generic, and be private there, while it is
8059 -- fully visible in the context of the instance. The internal
8060 -- subtype is private in the instance, but has full visibility
8061 -- like its parent in the enclosing scope. This enforces the
8062 -- invariant that the privacy status of all private dependents of
8063 -- a type coincide with that of the parent type. This can only
8064 -- happen when a generic child unit is instantiated within a
8067 if Is_Private_Type (E)
8068 and then not Is_Private_Type (Etype (E))
8070 Exchange_Declarations (E);
8073 elsif Ekind (E) = E_Package then
8075 -- The end of the renaming list is the renaming of the generic
8076 -- package itself. If the instance is a subprogram, all entities
8077 -- in the corresponding package are renamings. If this entity is
8078 -- a formal package, make its own formals private as well. The
8079 -- actual in this case is itself the renaming of an instantation.
8080 -- If the entity is not a package renaming, it is the entity
8081 -- created to validate formal package actuals: ignore.
8083 -- If the actual is itself a formal package for the enclosing
8084 -- generic, or the actual for such a formal package, it remains
8085 -- visible after the current instance, and therefore nothing
8086 -- needs to be done either, except to keep it accessible.
8089 and then Renamed_Object (E) = Pack_Id
8093 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8096 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8097 Set_Is_Hidden (E, False);
8101 Act_P : Entity_Id := Renamed_Object (E);
8102 Id : Entity_Id := First_Entity (Act_P);
8106 and then Id /= First_Private_Entity (Act_P)
8108 Set_Is_Hidden (Id, True);
8109 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8110 exit when Ekind (Id) = E_Package
8111 and then Renamed_Object (Id) = Act_P;
8122 end Restore_Private_Views;
8129 (Gen_Unit : Entity_Id;
8130 Act_Unit : Entity_Id)
8132 Saved : Instance_Env;
8135 Saved.Ada_83 := Ada_83;
8136 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8137 Saved.Exchanged_Views := Exchanged_Views;
8138 Saved.Hidden_Entities := Hidden_Entities;
8139 Saved.Current_Sem_Unit := Current_Sem_Unit;
8140 Instance_Envs.Increment_Last;
8141 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8143 -- Regardless of the current mode, predefined units are analyzed in
8144 -- Ada95 mode, and Ada83 checks don't apply.
8146 if Is_Internal_File_Name
8147 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8148 Renamings_Included => True) then
8152 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8153 Exchanged_Views := New_Elmt_List;
8154 Hidden_Entities := New_Elmt_List;
8157 ----------------------------
8158 -- Save_Global_References --
8159 ----------------------------
8161 procedure Save_Global_References (N : Node_Id) is
8162 Gen_Scope : Entity_Id;
8166 function Is_Global (E : Entity_Id) return Boolean;
8167 -- Check whether entity is defined outside of generic unit.
8168 -- Examine the scope of an entity, and the scope of the scope,
8169 -- etc, until we find either Standard, in which case the entity
8170 -- is global, or the generic unit itself, which indicates that
8171 -- the entity is local. If the entity is the generic unit itself,
8172 -- as in the case of a recursive call, or the enclosing generic unit,
8173 -- if different from the current scope, then it is local as well,
8174 -- because it will be replaced at the point of instantiation. On
8175 -- the other hand, if it is a reference to a child unit of a common
8176 -- ancestor, which appears in an instantiation, it is global because
8177 -- it is used to denote a specific compilation unit at the time the
8178 -- instantiations will be analyzed.
8180 procedure Reset_Entity (N : Node_Id);
8181 -- Save semantic information on global entity, so that it is not
8182 -- resolved again at instantiation time.
8184 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8185 -- Default actuals in nested instances must be handled specially
8186 -- because there is no link to them from the original tree. When an
8187 -- actual subprogram is given by a default, we add an explicit generic
8188 -- association for it in the instantiation node. When we save the
8189 -- global references on the name of the instance, we recover the list
8190 -- of generic associations, and add an explicit one to the original
8191 -- generic tree, through which a global actual can be preserved.
8192 -- Similarly, if a child unit is instantiated within a sibling, in the
8193 -- context of the parent, we must preserve the identifier of the parent
8194 -- so that it can be properly resolved in a subsequent instantiation.
8196 procedure Save_Global_Operand_Descendants (N : Node_Id);
8197 -- Apply Save_Global_Descendant to the possible operand fields
8198 -- of the node N (Field2 = Left_Opnd, Field3 = Right_Opnd).
8200 -- It is uncomfortable for Sem_Ch12 to have this knowledge ???
8202 procedure Save_Global_Descendant (D : Union_Id);
8203 -- Apply Save_Global_References recursively to the descendents of
8206 procedure Save_References (N : Node_Id);
8207 -- This is the recursive procedure that does the work, once the
8208 -- enclosing generic scope has been established.
8214 function Is_Global (E : Entity_Id) return Boolean is
8215 Se : Entity_Id := Scope (E);
8217 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8218 -- Determine whether the parent node of a reference to a child unit
8219 -- denotes an instantiation or a formal package, in which case the
8220 -- reference to the child unit is global, even if it appears within
8221 -- the current scope (e.g. when the instance appears within the body
8224 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8226 return (Nkind (Decl) in N_Generic_Instantiation
8228 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8229 end Is_Instance_Node;
8231 -- Start of processing for Is_Global
8234 if E = Gen_Scope then
8237 elsif E = Standard_Standard then
8240 elsif Is_Child_Unit (E)
8241 and then (Is_Instance_Node (Parent (N2))
8242 or else (Nkind (Parent (N2)) = N_Expanded_Name
8243 and then N2 = Selector_Name (Parent (N2))
8244 and then Is_Instance_Node (Parent (Parent (N2)))))
8249 while Se /= Gen_Scope loop
8250 if Se = Standard_Standard then
8265 procedure Reset_Entity (N : Node_Id) is
8267 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8268 -- The type of N2 is global to the generic unit. Save the
8269 -- type in the generic node.
8271 ---------------------
8272 -- Set_Global_Type --
8273 ---------------------
8275 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8276 Typ : constant Entity_Id := Etype (N2);
8282 and then Has_Private_View (Entity (N))
8284 -- If the entity of N is not the associated node, this is
8285 -- a nested generic and it has an associated node as well,
8286 -- whose type is already the full view (see below). Indicate
8287 -- that the original node has a private view.
8289 Set_Has_Private_View (N);
8292 -- If not a private type, nothing else to do
8294 if not Is_Private_Type (Typ) then
8295 if Is_Array_Type (Typ)
8296 and then Is_Private_Type (Component_Type (Typ))
8298 Set_Has_Private_View (N);
8301 -- If it is a derivation of a private type in a context where
8302 -- no full view is needed, nothing to do either.
8304 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8307 -- Otherwise mark the type for flipping and use the full_view
8311 Set_Has_Private_View (N);
8313 if Present (Full_View (Typ)) then
8314 Set_Etype (N2, Full_View (Typ));
8317 end Set_Global_Type;
8319 -- Start of processing for Reset_Entity
8322 N2 := Get_Associated_Node (N);
8326 if Is_Global (E) then
8327 Set_Global_Type (N, N2);
8329 elsif Nkind (N) = N_Op_Concat
8330 and then Is_Generic_Type (Etype (N2))
8332 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8333 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8334 and then Is_Intrinsic_Subprogram (E)
8339 -- Entity is local. Mark generic node as unresolved.
8340 -- Note that now it does not have an entity.
8342 Set_Associated_Node (N, Empty);
8343 Set_Etype (N, Empty);
8346 if (Nkind (Parent (N)) = N_Package_Instantiation
8347 or else Nkind (Parent (N)) = N_Function_Instantiation
8348 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8349 and then N = Name (Parent (N))
8351 Save_Global_Defaults (Parent (N), Parent (N2));
8354 elsif Nkind (Parent (N)) = N_Selected_Component
8355 and then Nkind (Parent (N2)) = N_Expanded_Name
8358 if Is_Global (Entity (Parent (N2))) then
8359 Change_Selected_Component_To_Expanded_Name (Parent (N));
8360 Set_Associated_Node (Parent (N), Parent (N2));
8361 Set_Global_Type (Parent (N), Parent (N2));
8362 Save_Global_Operand_Descendants (N);
8364 -- If this is a reference to the current generic entity,
8365 -- replace it with a simple name. This is to avoid anomalies
8366 -- when the enclosing scope is also a generic unit, in which
8367 -- case the selected component will not resolve to the current
8368 -- unit within an instance of the outer one. Ditto if the
8369 -- entity is an enclosing scope, e.g. a parent unit.
8371 elsif In_Open_Scopes (Entity (Parent (N2)))
8372 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8374 Rewrite (Parent (N),
8375 Make_Identifier (Sloc (N),
8376 Chars => Chars (Selector_Name (Parent (N2)))));
8379 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8380 or else Nkind (Parent (Parent (N)))
8381 = N_Function_Instantiation
8382 or else Nkind (Parent (Parent (N)))
8383 = N_Procedure_Instantiation)
8384 and then Parent (N) = Name (Parent (Parent (N)))
8386 Save_Global_Defaults
8387 (Parent (Parent (N)), Parent (Parent ((N2))));
8390 -- A selected component may denote a static constant that has
8391 -- been folded. Make the same replacement in original tree.
8393 elsif Nkind (Parent (N)) = N_Selected_Component
8394 and then (Nkind (Parent (N2)) = N_Integer_Literal
8395 or else Nkind (Parent (N2)) = N_Real_Literal)
8397 Rewrite (Parent (N),
8398 New_Copy (Parent (N2)));
8399 Set_Analyzed (Parent (N), False);
8401 -- A selected component may be transformed into a parameterless
8402 -- function call. If the called entity is global, rewrite the
8403 -- node appropriately, i.e. as an extended name for the global
8406 elsif Nkind (Parent (N)) = N_Selected_Component
8407 and then Nkind (Parent (N2)) = N_Function_Call
8408 and then Is_Global (Entity (Name (Parent (N2))))
8410 Change_Selected_Component_To_Expanded_Name (Parent (N));
8411 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8412 Set_Global_Type (Parent (N), Name (Parent (N2)));
8413 Save_Global_Operand_Descendants (N);
8416 -- Entity is local. Reset in generic unit, so that node
8417 -- is resolved anew at the point of instantiation.
8419 Set_Associated_Node (N, Empty);
8420 Set_Etype (N, Empty);
8424 --------------------------
8425 -- Save_Global_Defaults --
8426 --------------------------
8428 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8429 Loc : constant Source_Ptr := Sloc (N1);
8430 Assoc1 : List_Id := Generic_Associations (N1);
8431 Assoc2 : List_Id := Generic_Associations (N2);
8435 Gen_Id : Entity_Id := Entity (Name (N2));
8441 if Present (Assoc1) then
8442 Act1 := First (Assoc1);
8445 Set_Generic_Associations (N1, New_List);
8446 Assoc1 := Generic_Associations (N1);
8449 if Present (Assoc2) then
8450 Act2 := First (Assoc2);
8455 while Present (Act1) and then Present (Act2) loop
8460 -- Find the associations added for default suprograms.
8462 if Present (Act2) then
8463 while Nkind (Act2) /= N_Generic_Association
8464 or else No (Entity (Selector_Name (Act2)))
8465 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8470 -- Add a similar association if the default is global. The
8471 -- renaming declaration for the actual has been analyzed, and
8472 -- its alias is the program it renames. Link the actual in the
8473 -- original generic tree with the node in the analyzed tree.
8475 while Present (Act2) loop
8476 Subp := Entity (Selector_Name (Act2));
8477 Def := Explicit_Generic_Actual_Parameter (Act2);
8479 -- Following test is defence against rubbish errors
8481 if No (Alias (Subp)) then
8485 -- Retrieve the resolved actual from the renaming declaration
8486 -- created for the instantiated formal.
8488 Actual := Entity (Name (Parent (Parent (Subp))));
8489 Set_Entity (Def, Actual);
8490 Set_Etype (Def, Etype (Actual));
8492 if Is_Global (Actual) then
8494 Make_Generic_Association (Loc,
8495 Selector_Name => New_Occurrence_Of (Subp, Loc),
8496 Explicit_Generic_Actual_Parameter =>
8497 New_Occurrence_Of (Actual, Loc));
8500 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8502 Append (Ndec, Assoc1);
8504 -- If there are other defaults, add a dummy association
8505 -- in case there are other defaulted formals with the same
8508 elsif Present (Next (Act2)) then
8510 Make_Generic_Association (Loc,
8511 Selector_Name => New_Occurrence_Of (Subp, Loc),
8512 Explicit_Generic_Actual_Parameter => Empty);
8514 Append (Ndec, Assoc1);
8521 if Nkind (Name (N1)) = N_Identifier
8522 and then Is_Child_Unit (Gen_Id)
8523 and then Is_Global (Gen_Id)
8524 and then Is_Generic_Unit (Scope (Gen_Id))
8525 and then In_Open_Scopes (Scope (Gen_Id))
8527 -- This is an instantiation of a child unit within a sibling,
8528 -- so that the generic parent is in scope. An eventual instance
8529 -- must occur within the scope of an instance of the parent.
8530 -- Make name in instance into an expanded name, to preserve the
8531 -- identifier of the parent, so it can be resolved subsequently.
8534 Make_Expanded_Name (Loc,
8535 Chars => Chars (Gen_Id),
8536 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8537 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8538 Set_Entity (Name (N2), Gen_Id);
8541 Make_Expanded_Name (Loc,
8542 Chars => Chars (Gen_Id),
8543 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8544 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8546 Set_Associated_Node (Name (N1), Name (N2));
8547 Set_Associated_Node (Prefix (Name (N1)), Empty);
8549 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8550 Set_Etype (Name (N1), Etype (Gen_Id));
8553 end Save_Global_Defaults;
8555 ----------------------------
8556 -- Save_Global_Descendant --
8557 ----------------------------
8559 procedure Save_Global_Descendant (D : Union_Id) is
8563 if D in Node_Range then
8564 if D = Union_Id (Empty) then
8567 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8568 Save_References (Node_Id (D));
8571 elsif D in List_Range then
8572 if D = Union_Id (No_List)
8573 or else Is_Empty_List (List_Id (D))
8578 N1 := First (List_Id (D));
8579 while Present (N1) loop
8580 Save_References (N1);
8585 -- Element list or other non-node field, nothing to do
8590 end Save_Global_Descendant;
8592 -------------------------------------
8593 -- Save_Global_Operand_Descendants --
8594 -------------------------------------
8596 procedure Save_Global_Operand_Descendants (N : Node_Id) is
8598 use Atree.Unchecked_Access;
8599 -- This code section is part of the implementation of an untyped
8600 -- tree traversal, so it needs direct access to node fields.
8603 Save_Global_Descendant (Field2 (N));
8604 Save_Global_Descendant (Field3 (N));
8605 end Save_Global_Operand_Descendants;
8607 ---------------------
8608 -- Save_References --
8609 ---------------------
8611 -- This is the recursive procedure that does the work, once the
8612 -- enclosing generic scope has been established. We have to treat
8613 -- specially a number of node rewritings that are required by semantic
8614 -- processing and which change the kind of nodes in the generic copy:
8615 -- typically constant-folding, replacing an operator node by a string
8616 -- literal, or a selected component by an expanded name. In each of
8617 -- those cases, the transformation is propagated to the generic unit.
8619 procedure Save_References (N : Node_Id) is
8624 elsif (Nkind (N) = N_Character_Literal
8625 or else Nkind (N) = N_Operator_Symbol)
8627 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8630 elsif Nkind (N) = N_Operator_Symbol
8631 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
8633 Change_Operator_Symbol_To_String_Literal (N);
8636 elsif Nkind (N) in N_Op then
8638 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8640 if Nkind (N) = N_Op_Concat then
8641 Set_Is_Component_Left_Opnd (N,
8642 Is_Component_Left_Opnd (Get_Associated_Node (N)));
8644 Set_Is_Component_Right_Opnd (N,
8645 Is_Component_Right_Opnd (Get_Associated_Node (N)));
8650 -- Node may be transformed into call to a user-defined operator
8652 N2 := Get_Associated_Node (N);
8654 if Nkind (N2) = N_Function_Call then
8655 E := Entity (Name (N2));
8658 and then Is_Global (E)
8660 Set_Etype (N, Etype (N2));
8662 Set_Associated_Node (N, Empty);
8663 Set_Etype (N, Empty);
8666 elsif Nkind (N2) = N_Integer_Literal
8667 or else Nkind (N2) = N_Real_Literal
8668 or else Nkind (N2) = N_String_Literal
8669 or else (Nkind (N2) = N_Identifier
8671 Ekind (Entity (N2)) = E_Enumeration_Literal)
8673 -- Operation was constant-folded, perform the same
8674 -- replacement in generic.
8676 -- Note: we do a Replace here rather than a Rewrite,
8677 -- which is a definite violation of the standard rules
8678 -- with regard to retrievability of the original tree,
8679 -- and likely ASIS bugs or at least irregularities are
8680 -- caused by this choice.
8682 -- The reason we do this is that the appropriate original
8683 -- nodes are never constructed (we don't go applying the
8684 -- generic instantiation to rewritten nodes in general).
8685 -- We could try to create an appropriate copy but it would
8686 -- be hard work and does not seem worth while, because
8687 -- the original expression is accessible in the generic,
8688 -- and ASIS rules for traversing instances are fuzzy.
8690 Replace (N, New_Copy (N2));
8691 Set_Analyzed (N, False);
8695 -- Complete the check on operands
8697 Save_Global_Operand_Descendants (N);
8699 elsif Nkind (N) = N_Identifier then
8700 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8702 -- If this is a discriminant reference, always save it.
8703 -- It is used in the instance to find the corresponding
8704 -- discriminant positionally rather than by name.
8706 Set_Original_Discriminant
8707 (N, Original_Discriminant (Get_Associated_Node (N)));
8711 N2 := Get_Associated_Node (N);
8713 if Nkind (N2) = N_Function_Call then
8714 E := Entity (Name (N2));
8716 -- Name resolves to a call to parameterless function.
8717 -- If original entity is global, mark node as resolved.
8720 and then Is_Global (E)
8722 Set_Etype (N, Etype (N2));
8724 Set_Associated_Node (N, Empty);
8725 Set_Etype (N, Empty);
8729 Nkind (N2) = N_Integer_Literal or else
8730 Nkind (N2) = N_Real_Literal or else
8731 Nkind (N2) = N_String_Literal
8733 -- Name resolves to named number that is constant-folded,
8734 -- or to string literal from concatenation.
8735 -- Perform the same replacement in generic.
8737 Rewrite (N, New_Copy (N2));
8738 Set_Analyzed (N, False);
8740 elsif Nkind (N2) = N_Explicit_Dereference then
8742 -- An identifier is rewritten as a dereference if it is
8743 -- the prefix in a selected component, and it denotes an
8744 -- access to a composite type, or a parameterless function
8745 -- call that returns an access type.
8747 -- Check whether corresponding entity in prefix is global.
8749 if Is_Entity_Name (Prefix (N2))
8750 and then Present (Entity (Prefix (N2)))
8751 and then Is_Global (Entity (Prefix (N2)))
8754 Make_Explicit_Dereference (Sloc (N),
8755 Prefix => Make_Identifier (Sloc (N),
8756 Chars => Chars (N))));
8757 Set_Associated_Node (Prefix (N), Prefix (N2));
8759 elsif Nkind (Prefix (N2)) = N_Function_Call
8760 and then Is_Global (Entity (Name (Prefix (N2))))
8763 Make_Explicit_Dereference (Sloc (N),
8764 Prefix => Make_Function_Call (Sloc (N),
8766 Make_Identifier (Sloc (N),
8767 Chars => Chars (N)))));
8770 (Name (Prefix (N)), Name (Prefix (N2)));
8773 Set_Associated_Node (N, Empty);
8774 Set_Etype (N, Empty);
8777 -- The subtype mark of a nominally unconstrained object
8778 -- is rewritten as a subtype indication using the bounds
8779 -- of the expression. Recover the original subtype mark.
8781 elsif Nkind (N2) = N_Subtype_Indication
8782 and then Is_Entity_Name (Original_Node (N2))
8784 Set_Associated_Node (N, Original_Node (N2));
8792 elsif Nkind (N) in N_Entity then
8797 use Atree.Unchecked_Access;
8798 -- This code section is part of implementing an untyped tree
8799 -- traversal, so it needs direct access to node fields.
8802 if Nkind (N) = N_Aggregate
8804 Nkind (N) = N_Extension_Aggregate
8806 N2 := Get_Associated_Node (N);
8809 or else No (Etype (N2))
8810 or else not Is_Global (Etype (N2))
8812 Set_Associated_Node (N, Empty);
8815 Save_Global_Descendant (Field1 (N));
8816 Save_Global_Descendant (Field2 (N));
8817 Save_Global_Descendant (Field3 (N));
8818 Save_Global_Descendant (Field5 (N));
8820 -- All other cases than aggregates
8823 Save_Global_Descendant (Field1 (N));
8824 Save_Global_Descendant (Field2 (N));
8825 Save_Global_Descendant (Field3 (N));
8826 Save_Global_Descendant (Field4 (N));
8827 Save_Global_Descendant (Field5 (N));
8831 end Save_References;
8833 -- Start of processing for Save_Global_References
8836 Gen_Scope := Current_Scope;
8838 -- If the generic unit is a child unit, references to entities in
8839 -- the parent are treated as local, because they will be resolved
8840 -- anew in the context of the instance of the parent.
8842 while Is_Child_Unit (Gen_Scope)
8843 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8845 Gen_Scope := Scope (Gen_Scope);
8848 Save_References (N);
8849 end Save_Global_References;
8851 ---------------------
8852 -- Set_Copied_Sloc --
8853 ---------------------
8855 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8857 Create_Instantiation_Source (N, E, S_Adjustment);
8858 end Set_Copied_Sloc;
8860 ---------------------
8861 -- Set_Instance_Of --
8862 ---------------------
8864 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8866 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8867 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8868 Generic_Renamings.Increment_Last;
8869 end Set_Instance_Of;
8871 --------------------
8872 -- Set_Next_Assoc --
8873 --------------------
8875 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8877 Generic_Renamings.Table (E).Next_In_HTable := Next;
8884 procedure Start_Generic is
8886 -- ??? I am sure more things could be factored out in this
8887 -- routine. Should probably be done at a later stage.
8889 Generic_Flags.Increment_Last;
8890 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
8891 Inside_A_Generic := True;
8893 Expander_Mode_Save_And_Set (False);
8900 procedure Switch_View (T : Entity_Id) is
8901 Priv_Elmt : Elmt_Id := No_Elmt;
8902 Priv_Sub : Entity_Id;
8903 BT : Entity_Id := Base_Type (T);
8906 -- T may be private but its base type may have been exchanged through
8907 -- some other occurrence, in which case there is nothing to switch.
8909 if not Is_Private_Type (BT) then
8913 Priv_Elmt := First_Elmt (Private_Dependents (BT));
8915 if Present (Full_View (BT)) then
8916 Append_Elmt (Full_View (BT), Exchanged_Views);
8917 Exchange_Declarations (BT);
8920 while Present (Priv_Elmt) loop
8921 Priv_Sub := (Node (Priv_Elmt));
8923 -- We avoid flipping the subtype if the Etype of its full
8924 -- view is private because this would result in a malformed
8925 -- subtype. This occurs when the Etype of the subtype full
8926 -- view is the full view of the base type (and since the
8927 -- base types were just switched, the subtype is pointing
8928 -- to the wrong view). This is currently the case for
8929 -- tagged record types, access types (maybe more?) and
8930 -- needs to be resolved. ???
8932 if Present (Full_View (Priv_Sub))
8933 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
8935 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
8936 Exchange_Declarations (Priv_Sub);
8939 Next_Elmt (Priv_Elmt);
8943 -----------------------------
8944 -- Valid_Default_Attribute --
8945 -----------------------------
8947 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
8948 Attr_Id : constant Attribute_Id :=
8949 Get_Attribute_Id (Attribute_Name (Def));
8952 T : Entity_Id := Entity (Prefix (Def));
8954 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
8964 F := First_Formal (Nam);
8965 while Present (F) loop
8971 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
8972 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
8973 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
8974 Attribute_Unbiased_Rounding =>
8975 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
8977 when Attribute_Image | Attribute_Pred | Attribute_Succ |
8978 Attribute_Value | Attribute_Wide_Image |
8979 Attribute_Wide_Value =>
8980 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
8982 when Attribute_Max | Attribute_Min =>
8983 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
8985 when Attribute_Input =>
8986 OK := (Is_Fun and then Num_F = 1);
8988 when Attribute_Output | Attribute_Read | Attribute_Write =>
8989 OK := (not Is_Fun and then Num_F = 2);
8991 when others => OK := False;
8995 Error_Msg_N ("attribute reference has wrong profile for subprogram",
8998 end Valid_Default_Attribute;