1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
10 -- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- Extensive contributions were provided by Ada Core Technologies Inc. --
26 ------------------------------------------------------------------------------
28 with Atree; use Atree;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Expander; use Expander;
33 with Fname; use Fname;
34 with Fname.UF; use Fname.UF;
35 with Freeze; use Freeze;
37 with Inline; use Inline;
39 with Lib.Load; use Lib.Load;
40 with Lib.Xref; use Lib.Xref;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Restrict; use Restrict;
45 with Rtsfind; use Rtsfind;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Ch10; use Sem_Ch10;
53 with Sem_Ch13; use Sem_Ch13;
54 with Sem_Elab; use Sem_Elab;
55 with Sem_Elim; use Sem_Elim;
56 with Sem_Eval; use Sem_Eval;
57 with Sem_Res; use Sem_Res;
58 with Sem_Type; use Sem_Type;
59 with Sem_Util; use Sem_Util;
60 with Stand; use Stand;
61 with Sinfo; use Sinfo;
62 with Sinfo.CN; use Sinfo.CN;
63 with Sinput; use Sinput;
64 with Sinput.L; use Sinput.L;
65 with Snames; use Snames;
66 with Stringt; use Stringt;
67 with Uname; use Uname;
69 with Tbuild; use Tbuild;
70 with Uintp; use Uintp;
71 with Urealp; use Urealp;
75 package body Sem_Ch12 is
77 ----------------------------------------------------------
78 -- Implementation of Generic Analysis and Instantiation --
79 -----------------------------------------------------------
81 -- GNAT implements generics by macro expansion. No attempt is made to
82 -- share generic instantiations (for now). Analysis of a generic definition
83 -- does not perform any expansion action, but the expander must be called
84 -- on the tree for each instantiation, because the expansion may of course
85 -- depend on the generic actuals. All of this is best achieved as follows:
87 -- a) Semantic analysis of a generic unit is performed on a copy of the
88 -- tree for the generic unit. All tree modifications that follow analysis
89 -- do not affect the original tree. Links are kept between the original
90 -- tree and the copy, in order to recognize non-local references within
91 -- the generic, and propagate them to each instance (recall that name
92 -- resolution is done on the generic declaration: generics are not really
93 -- macros!). This is summarized in the following diagram:
95 -- .-----------. .----------.
96 -- | semantic |<--------------| generic |
98 -- | |==============>| |
99 -- |___________| global |__________|
110 -- b) Each instantiation copies the original tree, and inserts into it a
111 -- series of declarations that describe the mapping between generic formals
112 -- and actuals. For example, a generic In OUT parameter is an object
113 -- renaming of the corresponing actual, etc. Generic IN parameters are
114 -- constant declarations.
116 -- c) In order to give the right visibility for these renamings, we use
117 -- a different scheme for package and subprogram instantiations. For
118 -- packages, the list of renamings is inserted into the package
119 -- specification, before the visible declarations of the package. The
120 -- renamings are analyzed before any of the text of the instance, and are
121 -- thus visible at the right place. Furthermore, outside of the instance,
122 -- the generic parameters are visible and denote their corresponding
125 -- For subprograms, we create a container package to hold the renamings
126 -- and the subprogram instance itself. Analysis of the package makes the
127 -- renaming declarations visible to the subprogram. After analyzing the
128 -- package, the defining entity for the subprogram is touched-up so that
129 -- it appears declared in the current scope, and not inside the container
132 -- If the instantiation is a compilation unit, the container package is
133 -- given the same name as the subprogram instance. This ensures that
134 -- the elaboration procedure called by the binder, using the compilation
135 -- unit name, calls in fact the elaboration procedure for the package.
137 -- Not surprisingly, private types complicate this approach. By saving in
138 -- the original generic object the non-local references, we guarantee that
139 -- the proper entities are referenced at the point of instantiation.
140 -- However, for private types, this by itself does not insure that the
141 -- proper VIEW of the entity is used (the full type may be visible at the
142 -- point of generic definition, but not at instantiation, or vice-versa).
143 -- In order to reference the proper view, we special-case any reference
144 -- to private types in the generic object, by saving both views, one in
145 -- the generic and one in the semantic copy. At time of instantiation, we
146 -- check whether the two views are consistent, and exchange declarations if
147 -- necessary, in order to restore the correct visibility. Similarly, if
148 -- the instance view is private when the generic view was not, we perform
149 -- the exchange. After completing the instantiation, we restore the
150 -- current visibility. The flag Has_Private_View marks identifiers in the
151 -- the generic unit that require checking.
153 -- Visibility within nested generic units requires special handling.
154 -- Consider the following scheme:
156 -- type Global is ... -- outside of generic unit.
160 -- type Semi_Global is ... -- global to inner.
163 -- procedure inner (X1 : Global; X2 : Semi_Global);
165 -- procedure in2 is new inner (...); -- 4
168 -- package New_Outer is new Outer (...); -- 2
169 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
171 -- The semantic analysis of Outer captures all occurrences of Global.
172 -- The semantic analysis of Inner (at 1) captures both occurrences of
173 -- Global and Semi_Global.
175 -- At point 2 (instantiation of Outer), we also produce a generic copy
176 -- of Inner, even though Inner is, at that point, not being instantiated.
177 -- (This is just part of the semantic analysis of New_Outer).
179 -- Critically, references to Global within Inner must be preserved, while
180 -- references to Semi_Global should not preserved, because they must now
181 -- resolve to an entity within New_Outer. To distinguish between these, we
182 -- use a global variable, Current_Instantiated_Parent, which is set when
183 -- performing a generic copy during instantiation (at 2). This variable is
184 -- used when performing a generic copy that is not an instantiation, but
185 -- that is nested within one, as the occurrence of 1 within 2. The analysis
186 -- of a nested generic only preserves references that are global to the
187 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
188 -- determine whether a reference is external to the given parent.
190 -- The instantiation at point 3 requires no special treatment. The method
191 -- works as well for further nestings of generic units, but of course the
192 -- variable Current_Instantiated_Parent must be stacked because nested
193 -- instantiations can occur, e.g. the occurrence of 4 within 2.
195 -- The instantiation of package and subprogram bodies is handled in a
196 -- similar manner, except that it is delayed until after semantic
197 -- analysis is complete. In this fashion complex cross-dependencies
198 -- between several package declarations and bodies containing generics
199 -- can be compiled which otherwise would diagnose spurious circularities.
201 -- For example, it is possible to compile two packages A and B that
202 -- have the following structure:
204 -- package A is package B is
205 -- generic ... generic ...
206 -- package G_A is package G_B is
209 -- package body A is package body B is
210 -- package N_B is new G_B (..) package N_A is new G_A (..)
212 -- The table Pending_Instantiations in package Inline is used to keep
213 -- track of body instantiations that are delayed in this manner. Inline
214 -- handles the actual calls to do the body instantiations. This activity
215 -- is part of Inline, since the processing occurs at the same point, and
216 -- for essentially the same reason, as the handling of inlined routines.
218 ----------------------------------------------
219 -- Detection of Instantiation Circularities --
220 ----------------------------------------------
222 -- If we have a chain of instantiations that is circular, this is a
223 -- static error which must be detected at compile time. The detection
224 -- of these circularities is carried out at the point that we insert
225 -- a generic instance spec or body. If there is a circularity, then
226 -- the analysis of the offending spec or body will eventually result
227 -- in trying to load the same unit again, and we detect this problem
228 -- as we analyze the package instantiation for the second time.
230 -- At least in some cases after we have detected the circularity, we
231 -- get into trouble if we try to keep going. The following flag is
232 -- set if a circularity is detected, and used to abandon compilation
233 -- after the messages have been posted.
235 Circularity_Detected : Boolean := False;
236 -- This should really be reset on encountering a new main unit, but in
237 -- practice we are not using multiple main units so it is not critical.
239 -----------------------
240 -- Local subprograms --
241 -----------------------
243 procedure Abandon_Instantiation (N : Node_Id);
244 pragma No_Return (Abandon_Instantiation);
245 -- Posts an error message "instantiation abandoned" at the indicated
246 -- node and then raises the exception Instantiation_Error to do it.
248 procedure Analyze_Formal_Array_Type
249 (T : in out Entity_Id;
251 -- A formal array type is treated like an array type declaration, and
252 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
253 -- in-out, because in the case of an anonymous type the entity is
254 -- actually created in the procedure.
256 -- The following procedures treat other kinds of formal parameters.
258 procedure Analyze_Formal_Derived_Type
263 -- All the following need comments???
265 procedure Analyze_Formal_Decimal_Fixed_Point_Type
266 (T : Entity_Id; Def : Node_Id);
267 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
272 (T : Entity_Id; Def : Node_Id);
274 procedure Analyze_Formal_Private_Type
278 -- This needs comments???
280 procedure Analyze_Generic_Formal_Part (N : Node_Id);
282 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
283 -- This needs comments ???
285 function Analyze_Associations
290 -- At instantiation time, build the list of associations between formals
291 -- and actuals. Each association becomes a renaming declaration for the
292 -- formal entity. F_Copy is the analyzed list of formals in the generic
293 -- copy. It is used to apply legality checks to the actuals. I_Node is the
294 -- instantiation node itself.
296 procedure Analyze_Subprogram_Instantiation
300 procedure Build_Instance_Compilation_Unit_Nodes
304 -- This procedure is used in the case where the generic instance of a
305 -- subprogram body or package body is a library unit. In this case, the
306 -- original library unit node for the generic instantiation must be
307 -- replaced by the resulting generic body, and a link made to a new
308 -- compilation unit node for the generic declaration. The argument N is
309 -- the original generic instantiation. Act_Body and Act_Decl are the body
310 -- and declaration of the instance (either package body and declaration
311 -- nodes or subprogram body and declaration nodes depending on the case).
312 -- On return, the node N has been rewritten with the actual body.
314 procedure Check_Formal_Packages (P_Id : Entity_Id);
315 -- Apply the following to all formal packages in generic associations.
317 procedure Check_Formal_Package_Instance
318 (Formal_Pack : Entity_Id;
319 Actual_Pack : Entity_Id);
320 -- Verify that the actuals of the actual instance match the actuals of
321 -- the template for a formal package that is not declared with a box.
323 procedure Check_Forward_Instantiation (Decl : Node_Id);
324 -- If the generic is a local entity and the corresponding body has not
325 -- been seen yet, flag enclosing packages to indicate that it will be
326 -- elaborated after the generic body. Subprograms declared in the same
327 -- package cannot be inlined by the front-end because front-end inlining
328 -- requires a strict linear order of elaboration.
330 procedure Check_Hidden_Child_Unit
332 Gen_Unit : Entity_Id;
333 Act_Decl_Id : Entity_Id);
334 -- If the generic unit is an implicit child instance within a parent
335 -- instance, we need to make an explicit test that it is not hidden by
336 -- a child instance of the same name and parent.
338 procedure Check_Private_View (N : Node_Id);
339 -- Check whether the type of a generic entity has a different view between
340 -- the point of generic analysis and the point of instantiation. If the
341 -- view has changed, then at the point of instantiation we restore the
342 -- correct view to perform semantic analysis of the instance, and reset
343 -- the current view after instantiation. The processing is driven by the
344 -- current private status of the type of the node, and Has_Private_View,
345 -- a flag that is set at the point of generic compilation. If view and
346 -- flag are inconsistent then the type is updated appropriately.
348 procedure Check_Generic_Actuals
349 (Instance : Entity_Id;
350 Is_Formal_Box : Boolean);
351 -- Similar to previous one. Check the actuals in the instantiation,
352 -- whose views can change between the point of instantiation and the point
353 -- of instantiation of the body. In addition, mark the generic renamings
354 -- as generic actuals, so that they are not compatible with other actuals.
355 -- Recurse on an actual that is a formal package whose declaration has
358 function Contains_Instance_Of
363 -- Inner is instantiated within the generic Outer. Check whether Inner
364 -- directly or indirectly contains an instance of Outer or of one of its
365 -- parents, in the case of a subunit. Each generic unit holds a list of
366 -- the entities instantiated within (at any depth). This procedure
367 -- determines whether the set of such lists contains a cycle, i.e. an
368 -- illegal circular instantiation.
370 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
371 -- Returns True if E is a formal package of an enclosing generic, or
372 -- the actual for such a formal in an enclosing instantiation. Used in
373 -- Restore_Private_Views, to keep the formals of such a package visible
374 -- on exit from an inner instantiation.
376 function Find_Actual_Type
378 Gen_Scope : Entity_Id)
380 -- When validating the actual types of a child instance, check whether
381 -- the formal is a formal type of the parent unit, and retrieve the current
382 -- actual for it. Typ is the entity in the analyzed formal type declaration
383 -- (component or index type of an array type) and Gen_Scope is the scope of
384 -- the analyzed formal array type.
386 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
387 -- Given the entity of a unit that is an instantiation, retrieve the
388 -- original instance node. This is used when loading the instantiations
389 -- of the ancestors of a child generic that is being instantiated.
391 function In_Same_Declarative_Part
395 -- True if the instantiation Inst and the given freeze_node F_Node appear
396 -- within the same declarative part, ignoring subunits, but with no inter-
397 -- vening suprograms or concurrent units. If true, the freeze node
398 -- of the instance can be placed after the freeze node of the parent,
399 -- which it itself an instance.
401 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
402 -- Associate analyzed generic parameter with corresponding
403 -- instance. Used for semantic checks at instantiation time.
405 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
406 -- Traverse the Exchanged_Views list to see if a type was private
407 -- and has already been flipped during this phase of instantiation.
409 procedure Hide_Current_Scope;
410 -- When compiling a generic child unit, the parent context must be
411 -- present, but the instance and all entities that may be generated
412 -- must be inserted in the current scope. We leave the current scope
413 -- on the stack, but make its entities invisible to avoid visibility
414 -- problems. This is reversed at the end of instantiations. This is
415 -- not done for the instantiation of the bodies, which only require the
416 -- instances of the generic parents to be in scope.
418 procedure Install_Body
423 -- If the instantiation happens textually before the body of the generic,
424 -- the instantiation of the body must be analyzed after the generic body,
425 -- and not at the point of instantiation. Such early instantiations can
426 -- happen if the generic and the instance appear in a package declaration
427 -- because the generic body can only appear in the corresponding package
428 -- body. Early instantiations can also appear if generic, instance and
429 -- body are all in the declarative part of a subprogram or entry. Entities
430 -- of packages that are early instantiations are delayed, and their freeze
431 -- node appears after the generic body.
433 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
434 -- Insert freeze node at the end of the declarative part that includes the
435 -- instance node N. If N is in the visible part of an enclosing package
436 -- declaration, the freeze node has to be inserted at the end of the
437 -- private declarations, if any.
439 procedure Freeze_Subprogram_Body
440 (Inst_Node : Node_Id;
442 Pack_Id : Entity_Id);
443 -- The generic body may appear textually after the instance, including
444 -- in the proper body of a stub, or within a different package instance.
445 -- Given that the instance can only be elaborated after the generic, we
446 -- place freeze_nodes for the instance and/or for packages that may enclose
447 -- the instance and the generic, so that the back-end can establish the
448 -- proper order of elaboration.
450 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
451 -- When compiling an instance of a child unit the parent (which is
452 -- itself an instance) is an enclosing scope that must be made
453 -- immediately visible. This procedure is also used to install the non-
454 -- generic parent of a generic child unit when compiling its body, so that
455 -- full views of types in the parent are made visible.
457 procedure Remove_Parent (In_Body : Boolean := False);
458 -- Reverse effect after instantiation of child is complete.
460 procedure Inline_Instance_Body
462 Gen_Unit : Entity_Id;
464 -- If front-end inlining is requested, instantiate the package body,
465 -- and preserve the visibility of its compilation unit, to insure
466 -- that successive instantiations succeed.
468 -- The functions Instantiate_XXX perform various legality checks and build
469 -- the declarations for instantiated generic parameters.
470 -- Need to describe what the parameters are ???
472 function Instantiate_Object
475 Analyzed_Formal : Node_Id)
478 function Instantiate_Type
481 Analyzed_Formal : Node_Id)
484 function Instantiate_Formal_Subprogram
487 Analyzed_Formal : Node_Id)
490 function Instantiate_Formal_Package
493 Analyzed_Formal : Node_Id)
495 -- If the formal package is declared with a box, special visibility rules
496 -- apply to its formals: they are in the visible part of the package. This
497 -- is true in the declarative region of the formal package, that is to say
498 -- in the enclosing generic or instantiation. For an instantiation, the
499 -- parameters of the formal package are made visible in an explicit step.
500 -- Furthermore, if the actual is a visible use_clause, these formals must
501 -- be made potentially use_visible as well. On exit from the enclosing
502 -- instantiation, the reverse must be done.
504 -- For a formal package declared without a box, there are conformance rules
505 -- that apply to the actuals in the generic declaration and the actuals of
506 -- the actual package in the enclosing instantiation. The simplest way to
507 -- apply these rules is to repeat the instantiation of the formal package
508 -- in the context of the enclosing instance, and compare the generic
509 -- associations of this instantiation with those of the actual package.
511 function Is_In_Main_Unit (N : Node_Id) return Boolean;
512 -- Test if given node is in the main unit
514 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
515 -- If the generic appears in a separate non-generic library unit,
516 -- load the corresponding body to retrieve the body of the generic.
517 -- N is the node for the generic instantiation, Spec is the generic
518 -- package declaration.
520 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
521 -- Add the context clause of the unit containing a generic unit to
522 -- an instantiation that is a compilation unit.
524 function Get_Associated_Node (N : Node_Id) return Node_Id;
525 -- In order to propagate semantic information back from the analyzed
526 -- copy to the original generic, we maintain links between selected nodes
527 -- in the generic and their corresponding copies. At the end of generic
528 -- analysis, the routine Save_Global_References traverses the generic
529 -- tree, examines the semantic information, and preserves the links to
530 -- those nodes that contain global information. At instantiation, the
531 -- information from the associated node is placed on the new copy, so
532 -- that name resolution is not repeated.
534 -- Three kinds of source nodes have associated nodes:
536 -- a) those that can reference (denote) entities, that is identifiers,
537 -- character literals, expanded_names, operator symbols, operators,
538 -- and attribute reference nodes. These nodes have an Entity field
539 -- and are the set of nodes that are in N_Has_Entity.
541 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
543 -- c) selected components (N_Selected_Component)
545 -- For the first class, the associated node preserves the entity if it is
546 -- global. If the generic contains nested instantiations, the associated_
547 -- node itself has been recopied, and a chain of them must be followed.
549 -- For aggregates, the associated node allows retrieval of the type, which
550 -- may otherwise not appear in the generic. The view of this type may be
551 -- different between generic and instantiation, and the full view can be
552 -- installed before the instantiation is analyzed. For aggregates of
553 -- type extensions, the same view exchange may have to be performed for
554 -- some of the ancestor types, if their view is private at the point of
557 -- Nodes that are selected components in the parse tree may be rewritten
558 -- as expanded names after resolution, and must be treated as potential
559 -- entity holders. which is why they also have an Associated_Node.
561 -- Nodes that do not come from source, such as freeze nodes, do not appear
562 -- in the generic tree, and need not have an associated node.
564 -- The associated node is stored in the Associated_Node field. Note that
565 -- this field overlaps Entity, which is fine, because the whole point is
566 -- that we don't need or want the normal Entity field in this situation.
568 procedure Move_Freeze_Nodes
572 -- Freeze nodes can be generated in the analysis of a generic unit, but
573 -- will not be seen by the back-end. It is necessary to move those nodes
574 -- to the enclosing scope if they freeze an outer entity. We place them
575 -- at the end of the enclosing generic package, which is semantically
578 procedure Pre_Analyze_Actuals (N : Node_Id);
579 -- Analyze actuals to perform name resolution. Full resolution is done
580 -- later, when the expected types are known, but names have to be captured
581 -- before installing parents of generics, that are not visible for the
582 -- actuals themselves.
584 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
585 -- Verify that an attribute that appears as the default for a formal
586 -- subprogram is a function or procedure with the correct profile.
588 -------------------------------------------
589 -- Data Structures for Generic Renamings --
590 -------------------------------------------
592 -- The map Generic_Renamings associates generic entities with their
593 -- corresponding actuals. Currently used to validate type instances.
594 -- It will eventually be used for all generic parameters to eliminate
595 -- the need for overload resolution in the instance.
597 type Assoc_Ptr is new Int;
599 Assoc_Null : constant Assoc_Ptr := -1;
604 Next_In_HTable : Assoc_Ptr;
607 package Generic_Renamings is new Table.Table
608 (Table_Component_Type => Assoc,
609 Table_Index_Type => Assoc_Ptr,
610 Table_Low_Bound => 0,
612 Table_Increment => 100,
613 Table_Name => "Generic_Renamings");
615 -- Variable to hold enclosing instantiation. When the environment is
616 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
618 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
620 -- Hash table for associations
622 HTable_Size : constant := 37;
623 type HTable_Range is range 0 .. HTable_Size - 1;
625 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
626 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
627 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
628 function Hash (F : Entity_Id) return HTable_Range;
630 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
631 Header_Num => HTable_Range,
633 Elmt_Ptr => Assoc_Ptr,
634 Null_Ptr => Assoc_Null,
635 Set_Next => Set_Next_Assoc,
638 Get_Key => Get_Gen_Id,
642 Exchanged_Views : Elist_Id;
643 -- This list holds the private views that have been exchanged during
644 -- instantiation to restore the visibility of the generic declaration.
645 -- (see comments above). After instantiation, the current visibility is
646 -- reestablished by means of a traversal of this list.
648 Hidden_Entities : Elist_Id;
649 -- This list holds the entities of the current scope that are removed
650 -- from immediate visibility when instantiating a child unit. Their
651 -- visibility is restored in Remove_Parent.
653 -- Because instantiations can be recursive, the following must be saved
654 -- on entry and restored on exit from an instantiation (spec or body).
655 -- This is done by the two procedures Save_Env and Restore_Env.
657 type Instance_Env is record
659 Instantiated_Parent : Assoc;
660 Exchanged_Views : Elist_Id;
661 Hidden_Entities : Elist_Id;
662 Current_Sem_Unit : Unit_Number_Type;
665 package Instance_Envs is new Table.Table (
666 Table_Component_Type => Instance_Env,
667 Table_Index_Type => Int,
668 Table_Low_Bound => 0,
670 Table_Increment => 100,
671 Table_Name => "Instance_Envs");
673 procedure Restore_Private_Views
674 (Pack_Id : Entity_Id;
675 Is_Package : Boolean := True);
676 -- Restore the private views of external types, and unmark the generic
677 -- renamings of actuals, so that they become comptible subtypes again.
678 -- For subprograms, Pack_Id is the package constructed to hold the
681 procedure Switch_View (T : Entity_Id);
682 -- Switch the partial and full views of a type and its private
683 -- dependents (i.e. its subtypes and derived types).
685 ------------------------------------
686 -- Structures for Error Reporting --
687 ------------------------------------
689 Instantiation_Node : Node_Id;
690 -- Used by subprograms that validate instantiation of formal parameters
691 -- where there might be no actual on which to place the error message.
692 -- Also used to locate the instantiation node for generic subunits.
694 Instantiation_Error : exception;
695 -- When there is a semantic error in the generic parameter matching,
696 -- there is no point in continuing the instantiation, because the
697 -- number of cascaded errors is unpredictable. This exception aborts
698 -- the instantiation process altogether.
700 S_Adjustment : Sloc_Adjustment;
701 -- Offset created for each node in an instantiation, in order to keep
702 -- track of the source position of the instantiation in each of its nodes.
703 -- A subsequent semantic error or warning on a construct of the instance
704 -- points to both places: the original generic node, and the point of
705 -- instantiation. See Sinput and Sinput.L for additional details.
707 ------------------------------------------------------------
708 -- Data structure for keeping track when inside a Generic --
709 ------------------------------------------------------------
711 -- The following table is used to save values of the Inside_A_Generic
712 -- flag (see spec of Sem) when they are saved by Start_Generic.
714 package Generic_Flags is new Table.Table (
715 Table_Component_Type => Boolean,
716 Table_Index_Type => Int,
717 Table_Low_Bound => 0,
719 Table_Increment => 200,
720 Table_Name => "Generic_Flags");
722 ---------------------------
723 -- Abandon_Instantiation --
724 ---------------------------
726 procedure Abandon_Instantiation (N : Node_Id) is
728 Error_Msg_N ("instantiation abandoned!", N);
729 raise Instantiation_Error;
730 end Abandon_Instantiation;
732 --------------------------
733 -- Analyze_Associations --
734 --------------------------
736 function Analyze_Associations
742 Actuals : List_Id := Generic_Associations (I_Node);
744 Actual_Types : Elist_Id := New_Elmt_List;
745 Assoc : List_Id := New_List;
747 Next_Formal : Node_Id;
748 Temp_Formal : Node_Id;
749 Analyzed_Formal : Node_Id;
750 Defaults : Elist_Id := New_Elmt_List;
753 First_Named : Node_Id := Empty;
754 Found_Assoc : Node_Id;
755 Is_Named_Assoc : Boolean;
756 Num_Matched : Int := 0;
757 Num_Actuals : Int := 0;
759 function Matching_Actual
763 -- Find actual that corresponds to a given a formal parameter. If the
764 -- actuals are positional, return the next one, if any. If the actuals
765 -- are named, scan the parameter associations to find the right one.
766 -- A_F is the corresponding entity in the analyzed generic,which is
767 -- placed on the selector name for ASIS use.
769 procedure Set_Analyzed_Formal;
770 -- Find the node in the generic copy that corresponds to a given formal.
771 -- The semantic information on this node is used to perform legality
772 -- checks on the actuals. Because semantic analysis can introduce some
773 -- anonymous entities or modify the declaration node itself, the
774 -- correspondence between the two lists is not one-one. In addition to
775 -- anonymous types, the presence a formal equality will introduce an
776 -- implicit declaration for the corresponding inequality.
778 ---------------------
779 -- Matching_Actual --
780 ---------------------
782 function Matching_Actual
791 Is_Named_Assoc := False;
793 -- End of list of purely positional parameters
798 -- Case of positional parameter corresponding to current formal
800 elsif No (Selector_Name (Actual)) then
801 Found := Explicit_Generic_Actual_Parameter (Actual);
802 Found_Assoc := Actual;
803 Num_Matched := Num_Matched + 1;
806 -- Otherwise scan list of named actuals to find the one with the
807 -- desired name. All remaining actuals have explicit names.
810 Is_Named_Assoc := True;
814 while Present (Actual) loop
815 if Chars (Selector_Name (Actual)) = Chars (F) then
816 Found := Explicit_Generic_Actual_Parameter (Actual);
817 Set_Entity (Selector_Name (Actual), A_F);
818 Set_Etype (Selector_Name (Actual), Etype (A_F));
819 Found_Assoc := Actual;
820 Num_Matched := Num_Matched + 1;
828 -- Reset for subsequent searches. In most cases the named
829 -- associations are in order. If they are not, we reorder them
830 -- to avoid scanning twice the same actual. This is not just a
831 -- question of efficiency: there may be multiple defaults with
832 -- boxes that have the same name. In a nested instantiation we
833 -- insert actuals for those defaults, and cannot rely on their
834 -- names to disambiguate them.
836 if Actual = First_Named then
839 elsif Present (Actual) then
840 Insert_Before (First_Named, Remove_Next (Prev));
843 Actual := First_Named;
849 -------------------------
850 -- Set_Analyzed_Formal --
851 -------------------------
853 procedure Set_Analyzed_Formal is
856 while Present (Analyzed_Formal) loop
857 Kind := Nkind (Analyzed_Formal);
859 case Nkind (Formal) is
861 when N_Formal_Subprogram_Declaration =>
862 exit when Kind = N_Formal_Subprogram_Declaration
865 (Defining_Unit_Name (Specification (Formal))) =
867 (Defining_Unit_Name (Specification (Analyzed_Formal)));
869 when N_Formal_Package_Declaration =>
871 Kind = N_Formal_Package_Declaration
873 Kind = N_Generic_Package_Declaration;
875 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
879 -- Skip freeze nodes, and nodes inserted to replace
880 -- unrecognized pragmas.
883 Kind /= N_Formal_Subprogram_Declaration
884 and then Kind /= N_Subprogram_Declaration
885 and then Kind /= N_Freeze_Entity
886 and then Kind /= N_Null_Statement
887 and then Kind /= N_Itype_Reference
888 and then Chars (Defining_Identifier (Formal)) =
889 Chars (Defining_Identifier (Analyzed_Formal));
892 Next (Analyzed_Formal);
895 end Set_Analyzed_Formal;
897 -- Start of processing for Analyze_Associations
900 -- If named associations are present, save the first named association
901 -- (it may of course be Empty) to facilitate subsequent name search.
903 if Present (Actuals) then
904 First_Named := First (Actuals);
906 while Present (First_Named)
907 and then No (Selector_Name (First_Named))
909 Num_Actuals := Num_Actuals + 1;
914 Named := First_Named;
915 while Present (Named) loop
916 if No (Selector_Name (Named)) then
917 Error_Msg_N ("invalid positional actual after named one", Named);
918 Abandon_Instantiation (Named);
921 Num_Actuals := Num_Actuals + 1;
925 if Present (Formals) then
926 Formal := First_Non_Pragma (Formals);
927 Analyzed_Formal := First_Non_Pragma (F_Copy);
929 if Present (Actuals) then
930 Actual := First (Actuals);
932 -- All formals should have default values
938 while Present (Formal) loop
940 Next_Formal := Next_Non_Pragma (Formal);
942 case Nkind (Formal) is
943 when N_Formal_Object_Declaration =>
946 Defining_Identifier (Formal),
947 Defining_Identifier (Analyzed_Formal));
950 (Instantiate_Object (Formal, Match, Analyzed_Formal),
953 when N_Formal_Type_Declaration =>
956 Defining_Identifier (Formal),
957 Defining_Identifier (Analyzed_Formal));
960 Error_Msg_NE ("missing actual for instantiation of &",
961 Instantiation_Node, Defining_Identifier (Formal));
962 Abandon_Instantiation (Instantiation_Node);
967 Instantiate_Type (Formal, Match, Analyzed_Formal));
969 -- an instantiation is a freeze point for the actuals,
970 -- unless this is a rewritten formal package.
972 if Nkind (I_Node) /= N_Formal_Package_Declaration then
973 Append_Elmt (Entity (Match), Actual_Types);
977 -- A remote access-to-class-wide type must not be an
978 -- actual parameter for a generic formal of an access
979 -- type (E.2.2 (17)).
981 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
983 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
984 N_Access_To_Object_Definition
986 Validate_Remote_Access_To_Class_Wide_Type (Match);
989 when N_Formal_Subprogram_Declaration =>
992 Defining_Unit_Name (Specification (Formal)),
993 Defining_Unit_Name (Specification (Analyzed_Formal)));
995 -- If the formal subprogram has the same name as
996 -- another formal subprogram of the generic, then
997 -- a named association is illegal (12.3(9)). Exclude
998 -- named associations that are generated for a nested
1002 and then Is_Named_Assoc
1003 and then Comes_From_Source (Found_Assoc)
1005 Temp_Formal := First (Formals);
1006 while Present (Temp_Formal) loop
1007 if Nkind (Temp_Formal) =
1008 N_Formal_Subprogram_Declaration
1009 and then Temp_Formal /= Formal
1011 Chars (Selector_Name (Found_Assoc)) =
1012 Chars (Defining_Unit_Name
1013 (Specification (Temp_Formal)))
1016 ("name not allowed for overloaded formal",
1018 Abandon_Instantiation (Instantiation_Node);
1026 Instantiate_Formal_Subprogram
1027 (Formal, Match, Analyzed_Formal));
1030 and then Box_Present (Formal)
1033 (Defining_Unit_Name (Specification (Last (Assoc))),
1037 when N_Formal_Package_Declaration =>
1040 Defining_Identifier (Formal),
1041 Defining_Identifier (Original_Node (Analyzed_Formal)));
1045 ("missing actual for instantiation of&",
1047 Defining_Identifier (Formal));
1049 Abandon_Instantiation (Instantiation_Node);
1054 (Instantiate_Formal_Package
1055 (Formal, Match, Analyzed_Formal),
1059 -- For use type and use package appearing in the context
1060 -- clause, we have already copied them, so we can just
1061 -- move them where they belong (we mustn't recopy them
1062 -- since this would mess up the Sloc values).
1064 when N_Use_Package_Clause |
1065 N_Use_Type_Clause =>
1067 Append (Formal, Assoc);
1070 raise Program_Error;
1074 Formal := Next_Formal;
1075 Next_Non_Pragma (Analyzed_Formal);
1078 if Num_Actuals > Num_Matched then
1080 ("unmatched actuals in instantiation", Instantiation_Node);
1083 elsif Present (Actuals) then
1085 ("too many actuals in generic instantiation", Instantiation_Node);
1089 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1092 while Present (Elmt) loop
1093 Freeze_Before (I_Node, Node (Elmt));
1098 -- If there are default subprograms, normalize the tree by adding
1099 -- explicit associations for them. This is required if the instance
1100 -- appears within a generic.
1108 Elmt := First_Elmt (Defaults);
1109 while Present (Elmt) loop
1110 if No (Actuals) then
1111 Actuals := New_List;
1112 Set_Generic_Associations (I_Node, Actuals);
1115 Subp := Node (Elmt);
1117 Make_Generic_Association (Sloc (Subp),
1118 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1119 Explicit_Generic_Actual_Parameter =>
1120 New_Occurrence_Of (Subp, Sloc (Subp)));
1121 Mark_Rewrite_Insertion (New_D);
1122 Append_To (Actuals, New_D);
1128 end Analyze_Associations;
1130 -------------------------------
1131 -- Analyze_Formal_Array_Type --
1132 -------------------------------
1134 procedure Analyze_Formal_Array_Type
1135 (T : in out Entity_Id;
1141 -- Treated like a non-generic array declaration, with
1142 -- additional semantic checks.
1146 if Nkind (Def) = N_Constrained_Array_Definition then
1147 DSS := First (Discrete_Subtype_Definitions (Def));
1148 while Present (DSS) loop
1149 if Nkind (DSS) = N_Subtype_Indication
1150 or else Nkind (DSS) = N_Range
1151 or else Nkind (DSS) = N_Attribute_Reference
1153 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1160 Array_Type_Declaration (T, Def);
1161 Set_Is_Generic_Type (Base_Type (T));
1163 if Ekind (Component_Type (T)) = E_Incomplete_Type
1164 and then No (Full_View (Component_Type (T)))
1166 Error_Msg_N ("premature usage of incomplete type", Def);
1168 elsif Is_Internal (Component_Type (T))
1169 and then Nkind (Original_Node (Subtype_Indication (Def)))
1170 /= N_Attribute_Reference
1173 ("only a subtype mark is allowed in a formal",
1174 Subtype_Indication (Def));
1177 end Analyze_Formal_Array_Type;
1179 ---------------------------------------------
1180 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1181 ---------------------------------------------
1183 -- As for other generic types, we create a valid type representation
1184 -- with legal but arbitrary attributes, whose values are never considered
1185 -- static. For all scalar types we introduce an anonymous base type, with
1186 -- the same attributes. We choose the corresponding integer type to be
1187 -- Standard_Integer.
1189 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1193 Loc : constant Source_Ptr := Sloc (Def);
1194 Base : constant Entity_Id :=
1196 (E_Decimal_Fixed_Point_Type,
1197 Current_Scope, Sloc (Def), 'G');
1198 Int_Base : constant Entity_Id := Standard_Integer;
1199 Delta_Val : constant Ureal := Ureal_1;
1200 Digs_Val : constant Uint := Uint_6;
1205 Set_Etype (Base, Base);
1206 Set_Size_Info (Base, Int_Base);
1207 Set_RM_Size (Base, RM_Size (Int_Base));
1208 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1209 Set_Digits_Value (Base, Digs_Val);
1210 Set_Delta_Value (Base, Delta_Val);
1211 Set_Small_Value (Base, Delta_Val);
1212 Set_Scalar_Range (Base,
1214 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1215 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1217 Set_Is_Generic_Type (Base);
1218 Set_Parent (Base, Parent (Def));
1220 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1221 Set_Etype (T, Base);
1222 Set_Size_Info (T, Int_Base);
1223 Set_RM_Size (T, RM_Size (Int_Base));
1224 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1225 Set_Digits_Value (T, Digs_Val);
1226 Set_Delta_Value (T, Delta_Val);
1227 Set_Small_Value (T, Delta_Val);
1228 Set_Scalar_Range (T, Scalar_Range (Base));
1230 Check_Restriction (No_Fixed_Point, Def);
1231 end Analyze_Formal_Decimal_Fixed_Point_Type;
1233 ---------------------------------
1234 -- Analyze_Formal_Derived_Type --
1235 ---------------------------------
1237 procedure Analyze_Formal_Derived_Type
1242 Loc : constant Source_Ptr := Sloc (Def);
1244 Unk_Disc : Boolean := Unknown_Discriminants_Present (N);
1247 Set_Is_Generic_Type (T);
1249 if Private_Present (Def) then
1251 Make_Private_Extension_Declaration (Loc,
1252 Defining_Identifier => T,
1253 Discriminant_Specifications => Discriminant_Specifications (N),
1254 Unknown_Discriminants_Present => Unk_Disc,
1255 Subtype_Indication => Subtype_Mark (Def));
1257 Set_Abstract_Present (New_N, Abstract_Present (Def));
1261 Make_Full_Type_Declaration (Loc,
1262 Defining_Identifier => T,
1263 Discriminant_Specifications =>
1264 Discriminant_Specifications (Parent (T)),
1266 Make_Derived_Type_Definition (Loc,
1267 Subtype_Indication => Subtype_Mark (Def)));
1269 Set_Abstract_Present
1270 (Type_Definition (New_N), Abstract_Present (Def));
1277 if not Is_Composite_Type (T) then
1279 ("unknown discriminants not allowed for elementary types", N);
1281 Set_Has_Unknown_Discriminants (T);
1282 Set_Is_Constrained (T, False);
1286 -- If the parent type has a known size, so does the formal, which
1287 -- makes legal representation clauses that involve the formal.
1289 Set_Size_Known_At_Compile_Time
1290 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1292 end Analyze_Formal_Derived_Type;
1294 ----------------------------------
1295 -- Analyze_Formal_Discrete_Type --
1296 ----------------------------------
1298 -- The operations defined for a discrete types are those of an
1299 -- enumeration type. The size is set to an arbitrary value, for use
1300 -- in analyzing the generic unit.
1302 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1303 Loc : constant Source_Ptr := Sloc (Def);
1309 Set_Ekind (T, E_Enumeration_Type);
1314 -- For semantic analysis, the bounds of the type must be set to some
1315 -- non-static value. The simplest is to create attribute nodes for
1316 -- those bounds, that refer to the type itself. These bounds are never
1317 -- analyzed but serve as place-holders.
1320 Make_Attribute_Reference (Loc,
1321 Attribute_Name => Name_First,
1322 Prefix => New_Reference_To (T, Loc));
1326 Make_Attribute_Reference (Loc,
1327 Attribute_Name => Name_Last,
1328 Prefix => New_Reference_To (T, Loc));
1331 Set_Scalar_Range (T,
1336 end Analyze_Formal_Discrete_Type;
1338 ----------------------------------
1339 -- Analyze_Formal_Floating_Type --
1340 ---------------------------------
1342 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1343 Base : constant Entity_Id :=
1345 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1348 -- The various semantic attributes are taken from the predefined type
1349 -- Float, just so that all of them are initialized. Their values are
1350 -- never used because no constant folding or expansion takes place in
1351 -- the generic itself.
1354 Set_Ekind (T, E_Floating_Point_Subtype);
1355 Set_Etype (T, Base);
1356 Set_Size_Info (T, (Standard_Float));
1357 Set_RM_Size (T, RM_Size (Standard_Float));
1358 Set_Digits_Value (T, Digits_Value (Standard_Float));
1359 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1361 Set_Is_Generic_Type (Base);
1362 Set_Etype (Base, Base);
1363 Set_Size_Info (Base, (Standard_Float));
1364 Set_RM_Size (Base, RM_Size (Standard_Float));
1365 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1366 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1367 Set_Parent (Base, Parent (Def));
1369 Check_Restriction (No_Floating_Point, Def);
1370 end Analyze_Formal_Floating_Type;
1372 ---------------------------------
1373 -- Analyze_Formal_Modular_Type --
1374 ---------------------------------
1376 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1378 -- Apart from their entity kind, generic modular types are treated
1379 -- like signed integer types, and have the same attributes.
1381 Analyze_Formal_Signed_Integer_Type (T, Def);
1382 Set_Ekind (T, E_Modular_Integer_Subtype);
1383 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1385 end Analyze_Formal_Modular_Type;
1387 ---------------------------------------
1388 -- Analyze_Formal_Object_Declaration --
1389 ---------------------------------------
1391 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1392 E : constant Node_Id := Expression (N);
1393 Id : Node_Id := Defining_Identifier (N);
1400 -- Determine the mode of the formal object
1402 if Out_Present (N) then
1403 K := E_Generic_In_Out_Parameter;
1405 if not In_Present (N) then
1406 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1410 K := E_Generic_In_Parameter;
1413 Find_Type (Subtype_Mark (N));
1414 T := Entity (Subtype_Mark (N));
1416 if Ekind (T) = E_Incomplete_Type then
1417 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1420 if K = E_Generic_In_Parameter then
1421 if Is_Limited_Type (T) then
1423 ("generic formal of mode IN must not be of limited type", N);
1426 if Is_Abstract (T) then
1428 ("generic formal of mode IN must not be of abstract type", N);
1432 Analyze_Default_Expression (E, T);
1438 -- Case of generic IN OUT parameter.
1441 -- If the formal has an unconstrained type, construct its
1442 -- actual subtype, as is done for subprogram formals. In this
1443 -- fashion, all its uses can refer to specific bounds.
1448 if (Is_Array_Type (T)
1449 and then not Is_Constrained (T))
1451 (Ekind (T) = E_Record_Type
1452 and then Has_Discriminants (T))
1455 Non_Freezing_Ref : constant Node_Id :=
1456 New_Reference_To (Id, Sloc (Id));
1460 -- Make sure that the actual subtype doesn't generate
1463 Set_Must_Not_Freeze (Non_Freezing_Ref);
1464 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1465 Insert_Before_And_Analyze (N, Decl);
1466 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1469 Set_Actual_Subtype (Id, T);
1474 ("initialization not allowed for `IN OUT` formals", N);
1478 end Analyze_Formal_Object_Declaration;
1480 ----------------------------------------------
1481 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1482 ----------------------------------------------
1484 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1488 Loc : constant Source_Ptr := Sloc (Def);
1489 Base : constant Entity_Id :=
1491 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1493 -- The semantic attributes are set for completeness only, their
1494 -- values will never be used, because all properties of the type
1498 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1499 Set_Etype (T, Base);
1500 Set_Size_Info (T, Standard_Integer);
1501 Set_RM_Size (T, RM_Size (Standard_Integer));
1502 Set_Small_Value (T, Ureal_1);
1503 Set_Delta_Value (T, Ureal_1);
1504 Set_Scalar_Range (T,
1506 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1507 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1509 Set_Is_Generic_Type (Base);
1510 Set_Etype (Base, Base);
1511 Set_Size_Info (Base, Standard_Integer);
1512 Set_RM_Size (Base, RM_Size (Standard_Integer));
1513 Set_Small_Value (Base, Ureal_1);
1514 Set_Delta_Value (Base, Ureal_1);
1515 Set_Scalar_Range (Base, Scalar_Range (T));
1516 Set_Parent (Base, Parent (Def));
1518 Check_Restriction (No_Fixed_Point, Def);
1519 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1521 ----------------------------
1522 -- Analyze_Formal_Package --
1523 ----------------------------
1525 procedure Analyze_Formal_Package (N : Node_Id) is
1526 Loc : constant Source_Ptr := Sloc (N);
1527 Formal : Entity_Id := Defining_Identifier (N);
1528 Gen_Id : constant Node_Id := Name (N);
1530 Gen_Unit : Entity_Id;
1532 Parent_Installed : Boolean := False;
1534 Parent_Instance : Entity_Id;
1535 Renaming_In_Par : Entity_Id;
1538 Text_IO_Kludge (Gen_Id);
1540 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1541 Gen_Unit := Entity (Gen_Id);
1543 if Ekind (Gen_Unit) /= E_Generic_Package then
1544 Error_Msg_N ("expect generic package name", Gen_Id);
1547 elsif Gen_Unit = Current_Scope then
1549 ("generic package cannot be used as a formal package of itself",
1554 -- Check for a formal package that is a package renaming.
1556 if Present (Renamed_Object (Gen_Unit)) then
1557 Gen_Unit := Renamed_Object (Gen_Unit);
1560 -- The formal package is treated like a regular instance, but only
1561 -- the specification needs to be instantiated, to make entities visible.
1563 if not Box_Present (N) then
1564 Hidden_Entities := New_Elmt_List;
1565 Analyze_Package_Instantiation (N);
1567 if Parent_Installed then
1572 -- If there are no generic associations, the generic parameters
1573 -- appear as local entities and are instantiated like them. We copy
1574 -- the generic package declaration as if it were an instantiation,
1575 -- and analyze it like a regular package, except that we treat the
1576 -- formals as additional visible components.
1578 Save_Env (Gen_Unit, Formal);
1580 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1582 if In_Extended_Main_Source_Unit (N) then
1583 Set_Is_Instantiated (Gen_Unit);
1584 Generate_Reference (Gen_Unit, N);
1589 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1590 Set_Defining_Unit_Name (Specification (New_N), Formal);
1593 Enter_Name (Formal);
1594 Set_Ekind (Formal, E_Generic_Package);
1595 Set_Etype (Formal, Standard_Void_Type);
1596 Set_Inner_Instances (Formal, New_Elmt_List);
1599 -- Within the formal, the name of the generic package is a renaming
1600 -- of the formal (as for a regular instantiation).
1602 Renaming := Make_Package_Renaming_Declaration (Loc,
1603 Defining_Unit_Name =>
1604 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1605 Name => New_Reference_To (Formal, Loc));
1607 if Present (Visible_Declarations (Specification (N))) then
1608 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1609 elsif Present (Private_Declarations (Specification (N))) then
1610 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1613 if Is_Child_Unit (Gen_Unit)
1614 and then Parent_Installed
1616 -- Similarly, we have to make the name of the formal visible in
1617 -- the parent instance, to resolve properly fully qualified names
1618 -- that may appear in the generic unit. The parent instance has
1619 -- been placed on the scope stack ahead of the current scope.
1621 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1624 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1625 Set_Ekind (Renaming_In_Par, E_Package);
1626 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1627 Set_Scope (Renaming_In_Par, Parent_Instance);
1628 Set_Parent (Renaming_In_Par, Parent (Formal));
1629 Set_Renamed_Object (Renaming_In_Par, Formal);
1630 Append_Entity (Renaming_In_Par, Parent_Instance);
1633 Analyze_Generic_Formal_Part (N);
1634 Analyze (Specification (N));
1635 End_Package_Scope (Formal);
1637 if Parent_Installed then
1643 -- Inside the generic unit, the formal package is a regular
1644 -- package, but no body is needed for it. Note that after
1645 -- instantiation, the defining_unit_name we need is in the
1646 -- new tree and not in the original. (see Package_Instantiation).
1647 -- A generic formal package is an instance, and can be used as
1648 -- an actual for an inner instance. Mark its generic parent.
1650 Set_Ekind (Formal, E_Package);
1651 Set_Generic_Parent (Specification (N), Gen_Unit);
1652 Set_Has_Completion (Formal, True);
1654 end Analyze_Formal_Package;
1656 ---------------------------------
1657 -- Analyze_Formal_Private_Type --
1658 ---------------------------------
1660 procedure Analyze_Formal_Private_Type
1666 New_Private_Type (N, T, Def);
1668 -- Set the size to an arbitrary but legal value.
1670 Set_Size_Info (T, Standard_Integer);
1671 Set_RM_Size (T, RM_Size (Standard_Integer));
1672 end Analyze_Formal_Private_Type;
1674 ----------------------------------------
1675 -- Analyze_Formal_Signed_Integer_Type --
1676 ----------------------------------------
1678 procedure Analyze_Formal_Signed_Integer_Type
1682 Base : constant Entity_Id :=
1684 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1689 Set_Ekind (T, E_Signed_Integer_Subtype);
1690 Set_Etype (T, Base);
1691 Set_Size_Info (T, Standard_Integer);
1692 Set_RM_Size (T, RM_Size (Standard_Integer));
1693 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1695 Set_Is_Generic_Type (Base);
1696 Set_Size_Info (Base, Standard_Integer);
1697 Set_RM_Size (Base, RM_Size (Standard_Integer));
1698 Set_Etype (Base, Base);
1699 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1700 Set_Parent (Base, Parent (Def));
1701 end Analyze_Formal_Signed_Integer_Type;
1703 -------------------------------
1704 -- Analyze_Formal_Subprogram --
1705 -------------------------------
1707 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1708 Spec : constant Node_Id := Specification (N);
1709 Def : constant Node_Id := Default_Name (N);
1710 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1718 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1719 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1723 Analyze_Subprogram_Declaration (N);
1724 Set_Is_Formal_Subprogram (Nam);
1725 Set_Has_Completion (Nam);
1727 -- Default name is resolved at the point of instantiation
1729 if Box_Present (N) then
1732 -- Else default is bound at the point of generic declaration
1734 elsif Present (Def) then
1735 if Nkind (Def) = N_Operator_Symbol then
1736 Find_Direct_Name (Def);
1738 elsif Nkind (Def) /= N_Attribute_Reference then
1742 -- For an attribute reference, analyze the prefix and verify
1743 -- that it has the proper profile for the subprogram.
1745 Analyze (Prefix (Def));
1746 Valid_Default_Attribute (Nam, Def);
1750 -- Default name may be overloaded, in which case the interpretation
1751 -- with the correct profile must be selected, as for a renaming.
1753 if Etype (Def) = Any_Type then
1756 elsif Nkind (Def) = N_Selected_Component then
1757 Subp := Entity (Selector_Name (Def));
1759 if Ekind (Subp) /= E_Entry then
1760 Error_Msg_N ("expect valid subprogram name as default", Def);
1764 elsif Nkind (Def) = N_Indexed_Component then
1766 if Nkind (Prefix (Def)) /= N_Selected_Component then
1767 Error_Msg_N ("expect valid subprogram name as default", Def);
1771 Subp := Entity (Selector_Name (Prefix (Def)));
1773 if Ekind (Subp) /= E_Entry_Family then
1774 Error_Msg_N ("expect valid subprogram name as default", Def);
1779 elsif Nkind (Def) = N_Character_Literal then
1781 -- Needs some type checks: subprogram should be parameterless???
1783 Resolve (Def, (Etype (Nam)));
1785 elsif (not Is_Entity_Name (Def)
1786 or else not Is_Overloadable (Entity (Def)))
1788 Error_Msg_N ("expect valid subprogram name as default", Def);
1791 elsif not Is_Overloaded (Def) then
1792 Subp := Entity (Def);
1795 Error_Msg_N ("premature usage of formal subprogram", Def);
1797 elsif not Entity_Matches_Spec (Subp, Nam) then
1798 Error_Msg_N ("no visible entity matches specification", Def);
1804 I1 : Interp_Index := 0;
1810 Get_First_Interp (Def, I, It);
1811 while Present (It.Nam) loop
1813 if Entity_Matches_Spec (It.Nam, Nam) then
1814 if Subp /= Any_Id then
1815 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1817 if It1 = No_Interp then
1818 Error_Msg_N ("ambiguous default subprogram", Def);
1831 Get_Next_Interp (I, It);
1835 if Subp /= Any_Id then
1836 Set_Entity (Def, Subp);
1839 Error_Msg_N ("premature usage of formal subprogram", Def);
1841 elsif Ekind (Subp) /= E_Operator then
1842 Check_Mode_Conformant (Subp, Nam);
1846 Error_Msg_N ("no visible subprogram matches specification", N);
1850 end Analyze_Formal_Subprogram;
1852 -------------------------------------
1853 -- Analyze_Formal_Type_Declaration --
1854 -------------------------------------
1856 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1857 Def : constant Node_Id := Formal_Type_Definition (N);
1861 T := Defining_Identifier (N);
1863 if Present (Discriminant_Specifications (N))
1864 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1867 ("discriminants not allowed for this formal type",
1868 Defining_Identifier (First (Discriminant_Specifications (N))));
1871 -- Enter the new name, and branch to specific routine.
1874 when N_Formal_Private_Type_Definition =>
1875 Analyze_Formal_Private_Type (N, T, Def);
1877 when N_Formal_Derived_Type_Definition =>
1878 Analyze_Formal_Derived_Type (N, T, Def);
1880 when N_Formal_Discrete_Type_Definition =>
1881 Analyze_Formal_Discrete_Type (T, Def);
1883 when N_Formal_Signed_Integer_Type_Definition =>
1884 Analyze_Formal_Signed_Integer_Type (T, Def);
1886 when N_Formal_Modular_Type_Definition =>
1887 Analyze_Formal_Modular_Type (T, Def);
1889 when N_Formal_Floating_Point_Definition =>
1890 Analyze_Formal_Floating_Type (T, Def);
1892 when N_Formal_Ordinary_Fixed_Point_Definition =>
1893 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1895 when N_Formal_Decimal_Fixed_Point_Definition =>
1896 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1898 when N_Array_Type_Definition =>
1899 Analyze_Formal_Array_Type (T, Def);
1901 when N_Access_To_Object_Definition |
1902 N_Access_Function_Definition |
1903 N_Access_Procedure_Definition =>
1904 Analyze_Generic_Access_Type (T, Def);
1910 raise Program_Error;
1914 Set_Is_Generic_Type (T);
1915 end Analyze_Formal_Type_Declaration;
1917 ------------------------------------
1918 -- Analyze_Function_Instantiation --
1919 ------------------------------------
1921 procedure Analyze_Function_Instantiation (N : Node_Id) is
1923 Analyze_Subprogram_Instantiation (N, E_Function);
1924 end Analyze_Function_Instantiation;
1926 ---------------------------------
1927 -- Analyze_Generic_Access_Type --
1928 ---------------------------------
1930 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1934 if Nkind (Def) = N_Access_To_Object_Definition then
1935 Access_Type_Declaration (T, Def);
1937 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1938 and then No (Full_View (Designated_Type (T)))
1939 and then not Is_Generic_Type (Designated_Type (T))
1941 Error_Msg_N ("premature usage of incomplete type", Def);
1943 elsif Is_Internal (Designated_Type (T)) then
1945 ("only a subtype mark is allowed in a formal", Def);
1949 Access_Subprogram_Declaration (T, Def);
1951 end Analyze_Generic_Access_Type;
1953 ---------------------------------
1954 -- Analyze_Generic_Formal_Part --
1955 ---------------------------------
1957 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
1958 Gen_Parm_Decl : Node_Id;
1961 -- The generic formals are processed in the scope of the generic
1962 -- unit, where they are immediately visible. The scope is installed
1965 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
1967 while Present (Gen_Parm_Decl) loop
1968 Analyze (Gen_Parm_Decl);
1969 Next (Gen_Parm_Decl);
1971 end Analyze_Generic_Formal_Part;
1973 ------------------------------------------
1974 -- Analyze_Generic_Package_Declaration --
1975 ------------------------------------------
1977 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
1980 Save_Parent : Node_Id;
1983 -- Create copy of generic unit, and save for instantiation.
1984 -- If the unit is a child unit, do not copy the specifications
1985 -- for the parent, which are not part of the generic tree.
1987 Save_Parent := Parent_Spec (N);
1988 Set_Parent_Spec (N, Empty);
1990 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
1991 Set_Parent_Spec (New_N, Save_Parent);
1993 Id := Defining_Entity (N);
1994 Generate_Definition (Id);
1996 -- Expansion is not applied to generic units.
2001 Set_Ekind (Id, E_Generic_Package);
2002 Set_Etype (Id, Standard_Void_Type);
2004 Enter_Generic_Scope (Id);
2005 Set_Inner_Instances (Id, New_Elmt_List);
2007 Set_Categorization_From_Pragmas (N);
2008 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2010 -- For a library unit, we have reconstructed the entity for the
2011 -- unit, and must reset it in the library tables.
2013 if Nkind (Parent (N)) = N_Compilation_Unit then
2014 Set_Cunit_Entity (Current_Sem_Unit, Id);
2017 Analyze_Generic_Formal_Part (N);
2019 -- After processing the generic formals, analysis proceeds
2020 -- as for a non-generic package.
2022 Analyze (Specification (N));
2024 Validate_Categorization_Dependency (N, Id);
2028 End_Package_Scope (Id);
2029 Exit_Generic_Scope (Id);
2031 if Nkind (Parent (N)) /= N_Compilation_Unit then
2032 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2033 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2034 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2037 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2038 Validate_RT_RAT_Component (N);
2041 end Analyze_Generic_Package_Declaration;
2043 --------------------------------------------
2044 -- Analyze_Generic_Subprogram_Declaration --
2045 --------------------------------------------
2047 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2052 Save_Parent : Node_Id;
2055 -- Create copy of generic unit,and save for instantiation.
2056 -- If the unit is a child unit, do not copy the specifications
2057 -- for the parent, which are not part of the generic tree.
2059 Save_Parent := Parent_Spec (N);
2060 Set_Parent_Spec (N, Empty);
2062 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2063 Set_Parent_Spec (New_N, Save_Parent);
2066 Spec := Specification (N);
2067 Id := Defining_Entity (Spec);
2068 Generate_Definition (Id);
2070 if Nkind (Id) = N_Defining_Operator_Symbol then
2072 ("operator symbol not allowed for generic subprogram", Id);
2079 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2081 Enter_Generic_Scope (Id);
2082 Set_Inner_Instances (Id, New_Elmt_List);
2083 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2085 Analyze_Generic_Formal_Part (N);
2087 Formals := Parameter_Specifications (Spec);
2089 if Present (Formals) then
2090 Process_Formals (Formals, Spec);
2093 if Nkind (Spec) = N_Function_Specification then
2094 Set_Ekind (Id, E_Generic_Function);
2095 Find_Type (Subtype_Mark (Spec));
2096 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2098 Set_Ekind (Id, E_Generic_Procedure);
2099 Set_Etype (Id, Standard_Void_Type);
2102 -- For a library unit, we have reconstructed the entity for the
2103 -- unit, and must reset it in the library tables. We also need
2104 -- to make sure that Body_Required is set properly in the original
2105 -- compilation unit node.
2107 if Nkind (Parent (N)) = N_Compilation_Unit then
2108 Set_Cunit_Entity (Current_Sem_Unit, Id);
2109 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2112 Set_Categorization_From_Pragmas (N);
2113 Validate_Categorization_Dependency (N, Id);
2115 Save_Global_References (Original_Node (N));
2119 Exit_Generic_Scope (Id);
2121 end Analyze_Generic_Subprogram_Declaration;
2123 -----------------------------------
2124 -- Analyze_Package_Instantiation --
2125 -----------------------------------
2127 -- Note: this procedure is also used for formal package declarations,
2128 -- in which case the argument N is an N_Formal_Package_Declaration
2129 -- node. This should really be noted in the spec! ???
2131 procedure Analyze_Package_Instantiation (N : Node_Id) is
2132 Loc : constant Source_Ptr := Sloc (N);
2133 Gen_Id : constant Node_Id := Name (N);
2136 Act_Decl_Name : Node_Id;
2137 Act_Decl_Id : Entity_Id;
2142 Gen_Unit : Entity_Id;
2144 Is_Actual_Pack : Boolean := Is_Internal (Defining_Entity (N));
2145 Parent_Installed : Boolean := False;
2146 Renaming_List : List_Id;
2147 Unit_Renaming : Node_Id;
2148 Needs_Body : Boolean;
2149 Inline_Now : Boolean := False;
2151 procedure Delay_Descriptors (E : Entity_Id);
2152 -- Delay generation of subprogram descriptors for given entity
2154 function Might_Inline_Subp return Boolean;
2155 -- If inlining is active and the generic contains inlined subprograms,
2156 -- we instantiate the body. This may cause superfluous instantiations,
2157 -- but it is simpler than detecting the need for the body at the point
2158 -- of inlining, when the context of the instance is not available.
2160 -----------------------
2161 -- Delay_Descriptors --
2162 -----------------------
2164 procedure Delay_Descriptors (E : Entity_Id) is
2166 if not Delay_Subprogram_Descriptors (E) then
2167 Set_Delay_Subprogram_Descriptors (E);
2168 Pending_Descriptor.Increment_Last;
2169 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2171 end Delay_Descriptors;
2173 -----------------------
2174 -- Might_Inline_Subp --
2175 -----------------------
2177 function Might_Inline_Subp return Boolean is
2181 if not Inline_Processing_Required then
2185 E := First_Entity (Gen_Unit);
2187 while Present (E) loop
2189 if Is_Subprogram (E)
2190 and then Is_Inlined (E)
2200 end Might_Inline_Subp;
2202 -- Start of processing for Analyze_Package_Instantiation
2205 -- Very first thing: apply the special kludge for Text_IO processing
2206 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2208 Text_IO_Kludge (Name (N));
2210 -- Make node global for error reporting.
2212 Instantiation_Node := N;
2214 -- Case of instantiation of a generic package
2216 if Nkind (N) = N_Package_Instantiation then
2217 Act_Decl_Id := New_Copy (Defining_Entity (N));
2218 Set_Comes_From_Source (Act_Decl_Id, True);
2220 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2222 Make_Defining_Program_Unit_Name (Loc,
2223 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2224 Defining_Identifier => Act_Decl_Id);
2226 Act_Decl_Name := Act_Decl_Id;
2229 -- Case of instantiation of a formal package
2232 Act_Decl_Id := Defining_Identifier (N);
2233 Act_Decl_Name := Act_Decl_Id;
2236 Generate_Definition (Act_Decl_Id);
2237 Pre_Analyze_Actuals (N);
2239 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2240 Gen_Unit := Entity (Gen_Id);
2242 -- Verify that it is the name of a generic package
2244 if Etype (Gen_Unit) = Any_Type then
2247 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2249 ("expect name of generic package in instantiation", Gen_Id);
2253 if In_Extended_Main_Source_Unit (N) then
2254 Set_Is_Instantiated (Gen_Unit);
2255 Generate_Reference (Gen_Unit, N);
2257 if Present (Renamed_Object (Gen_Unit)) then
2258 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2259 Generate_Reference (Renamed_Object (Gen_Unit), N);
2263 if Nkind (Gen_Id) = N_Identifier
2264 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2267 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2269 elsif Nkind (Gen_Id) = N_Expanded_Name
2270 and then Is_Child_Unit (Gen_Unit)
2271 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2272 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2275 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2278 Set_Entity (Gen_Id, Gen_Unit);
2280 -- If generic is a renaming, get original generic unit.
2282 if Present (Renamed_Object (Gen_Unit))
2283 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2285 Gen_Unit := Renamed_Object (Gen_Unit);
2288 -- Verify that there are no circular instantiations.
2290 if In_Open_Scopes (Gen_Unit) then
2291 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2294 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2295 Error_Msg_Node_2 := Current_Scope;
2297 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2298 Circularity_Detected := True;
2302 Save_Env (Gen_Unit, Act_Decl_Id);
2303 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2305 -- Initialize renamings map, for error checking, and the list
2306 -- that holds private entities whose views have changed between
2307 -- generic definition and instantiation. If this is the instance
2308 -- created to validate an actual package, the instantiation
2309 -- environment is that of the enclosing instance.
2311 Generic_Renamings.Set_Last (0);
2312 Generic_Renamings_HTable.Reset;
2314 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2316 -- Copy original generic tree, to produce text for instantiation.
2320 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2322 Act_Spec := Specification (Act_Tree);
2324 -- If this is the instance created to validate an actual package,
2325 -- only the formals matter, do not examine the package spec itself.
2327 if Is_Actual_Pack then
2328 Set_Visible_Declarations (Act_Spec, New_List);
2329 Set_Private_Declarations (Act_Spec, New_List);
2333 Analyze_Associations
2335 Generic_Formal_Declarations (Act_Tree),
2336 Generic_Formal_Declarations (Gen_Decl));
2338 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2339 Set_Is_Generic_Instance (Act_Decl_Id);
2341 Set_Generic_Parent (Act_Spec, Gen_Unit);
2343 -- References to the generic in its own declaration or its body
2344 -- are references to the instance. Add a renaming declaration for
2345 -- the generic unit itself. This declaration, as well as the renaming
2346 -- declarations for the generic formals, must remain private to the
2347 -- unit: the formals, because this is the language semantics, and
2348 -- the unit because its use is an artifact of the implementation.
2351 Make_Package_Renaming_Declaration (Loc,
2352 Defining_Unit_Name =>
2353 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2354 Name => New_Reference_To (Act_Decl_Id, Loc));
2356 Append (Unit_Renaming, Renaming_List);
2358 -- The renaming declarations are the first local declarations of
2361 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2363 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2365 Set_Visible_Declarations (Act_Spec, Renaming_List);
2369 Make_Package_Declaration (Loc,
2370 Specification => Act_Spec);
2372 -- Save the instantiation node, for subsequent instantiation
2373 -- of the body, if there is one and we are generating code for
2374 -- the current unit. Mark the unit as having a body, to avoid
2375 -- a premature error message.
2377 -- We instantiate the body if we are generating code, if we are
2378 -- generating cross-reference information, or if we are building
2379 -- trees for ASIS use.
2382 Enclosing_Body_Present : Boolean := False;
2386 if Scope (Gen_Unit) /= Standard_Standard
2387 and then not Is_Child_Unit (Gen_Unit)
2389 Scop := Scope (Gen_Unit);
2391 while Present (Scop)
2392 and then Scop /= Standard_Standard
2394 if Unit_Requires_Body (Scop) then
2395 Enclosing_Body_Present := True;
2399 Scop := Scope (Scop);
2403 -- If front-end inlining is enabled, and this is a unit for which
2404 -- code will be generated, we instantiate the body at once.
2405 -- This is done if the instance is not the main unit, and if the
2406 -- generic is not a child unit, to avoid scope problems.
2408 if Front_End_Inlining
2409 and then Expander_Active
2410 and then not Is_Child_Unit (Gen_Unit)
2411 and then Is_In_Main_Unit (N)
2412 and then Nkind (Parent (N)) /= N_Compilation_Unit
2413 and then Might_Inline_Subp
2419 (Unit_Requires_Body (Gen_Unit)
2420 or else Enclosing_Body_Present
2421 or else Present (Corresponding_Body (Gen_Decl)))
2422 and then (Is_In_Main_Unit (N)
2423 or else Might_Inline_Subp)
2424 and then not Is_Actual_Pack
2425 and then not Inline_Now
2427 and then (Operating_Mode = Generate_Code
2428 or else (Operating_Mode = Check_Semantics
2429 and then Tree_Output));
2431 -- If front_end_inlining is enabled, do not instantiate a
2432 -- body if within a generic context.
2434 if Front_End_Inlining
2435 and then not Expander_Active
2437 Needs_Body := False;
2442 -- If we are generating the calling stubs from the instantiation
2443 -- of a generic RCI package, we will not use the body of the
2446 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2447 and then Is_Compilation_Unit (Defining_Entity (N))
2449 Needs_Body := False;
2454 -- Here is a defence against a ludicrous number of instantiations
2455 -- caused by a circular set of instantiation attempts.
2457 if Pending_Instantiations.Last >
2458 Hostparm.Max_Instantiations
2460 Error_Msg_N ("too many instantiations", N);
2461 raise Unrecoverable_Error;
2464 -- Indicate that the enclosing scopes contain an instantiation,
2465 -- and that cleanup actions should be delayed until after the
2466 -- instance body is expanded.
2468 Check_Forward_Instantiation (Gen_Decl);
2469 if Nkind (N) = N_Package_Instantiation then
2471 Enclosing_Master : Entity_Id := Current_Scope;
2474 while Enclosing_Master /= Standard_Standard loop
2476 if Ekind (Enclosing_Master) = E_Package then
2477 if Is_Compilation_Unit (Enclosing_Master) then
2478 if In_Package_Body (Enclosing_Master) then
2480 (Body_Entity (Enclosing_Master));
2489 Enclosing_Master := Scope (Enclosing_Master);
2492 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2493 Enclosing_Master := Scope (Enclosing_Master);
2495 elsif Ekind (Enclosing_Master) = E_Generic_Function
2496 or else Ekind (Enclosing_Master) = E_Generic_Procedure
2497 or else Ekind (Enclosing_Master) = E_Void
2499 -- Cleanup actions will eventually be performed on
2500 -- the enclosing instance, if any. enclosing scope
2501 -- is void in the formal part of a generic subp.
2506 if Ekind (Enclosing_Master) = E_Entry
2508 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2511 Protected_Body_Subprogram (Enclosing_Master);
2514 Set_Delay_Cleanups (Enclosing_Master);
2516 while Ekind (Enclosing_Master) = E_Block loop
2517 Enclosing_Master := Scope (Enclosing_Master);
2520 if Is_Subprogram (Enclosing_Master) then
2521 Delay_Descriptors (Enclosing_Master);
2523 elsif Is_Task_Type (Enclosing_Master) then
2525 TBP : constant Node_Id :=
2526 Get_Task_Body_Procedure
2530 if Present (TBP) then
2531 Delay_Descriptors (TBP);
2532 Set_Delay_Cleanups (TBP);
2542 -- Make entry in table
2544 Pending_Instantiations.Increment_Last;
2545 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2546 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2550 Set_Categorization_From_Pragmas (Act_Decl);
2552 if Parent_Installed then
2556 Set_Instance_Spec (N, Act_Decl);
2558 -- If not a compilation unit, insert the package declaration
2559 -- after the instantiation node.
2561 if Nkind (Parent (N)) /= N_Compilation_Unit then
2562 Mark_Rewrite_Insertion (Act_Decl);
2563 Insert_Before (N, Act_Decl);
2566 -- For an instantiation that is a compilation unit, place
2567 -- declaration on current node so context is complete
2568 -- for analysis (including nested instantiations). It this
2569 -- is the main unit, the declaration eventually replaces the
2570 -- instantiation node. If the instance body is later created, it
2571 -- replaces the instance node, and the declation is attached to
2572 -- it (see Build_Instance_Compilation_Unit_Nodes).
2575 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2577 -- The entity for the current unit is the newly created one,
2578 -- and all semantic information is attached to it.
2580 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2582 -- If this is the main unit, replace the main entity as well.
2584 if Current_Sem_Unit = Main_Unit then
2585 Main_Unit_Entity := Act_Decl_Id;
2589 Set_Unit (Parent (N), Act_Decl);
2590 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2592 Set_Unit (Parent (N), N);
2593 Set_Body_Required (Parent (N), False);
2595 -- We never need elaboration checks on instantiations, since
2596 -- by definition, the body instantiation is elaborated at the
2597 -- same time as the spec instantiation.
2599 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2600 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2603 Check_Elab_Instantiation (N);
2605 if ABE_Is_Certain (N) and then Needs_Body then
2606 Pending_Instantiations.Decrement_Last;
2608 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2610 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2611 First_Private_Entity (Act_Decl_Id));
2613 if Nkind (Parent (N)) = N_Compilation_Unit
2614 and then not Needs_Body
2616 Rewrite (N, Act_Decl);
2619 if Present (Corresponding_Body (Gen_Decl))
2620 or else Unit_Requires_Body (Gen_Unit)
2622 Set_Has_Completion (Act_Decl_Id);
2625 Check_Formal_Packages (Act_Decl_Id);
2627 Restore_Private_Views (Act_Decl_Id);
2629 if not Generic_Separately_Compiled (Gen_Unit) then
2630 Inherit_Context (Gen_Decl, N);
2633 if Parent_Installed then
2640 Validate_Categorization_Dependency (N, Act_Decl_Id);
2642 -- Check restriction, but skip this if something went wrong in
2643 -- the above analysis, indicated by Act_Decl_Id being void.
2645 if Ekind (Act_Decl_Id) /= E_Void
2646 and then not Is_Library_Level_Entity (Act_Decl_Id)
2648 Check_Restriction (No_Local_Allocators, N);
2652 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2656 when Instantiation_Error =>
2657 if Parent_Installed then
2661 end Analyze_Package_Instantiation;
2663 ---------------------------
2664 -- Inline_Instance_Body --
2665 ---------------------------
2667 procedure Inline_Instance_Body
2669 Gen_Unit : Entity_Id;
2673 Gen_Comp : constant Entity_Id :=
2674 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2675 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2676 Curr_Scope : Entity_Id := Empty;
2677 Curr_Unit : constant Entity_Id :=
2678 Cunit_Entity (Current_Sem_Unit);
2679 Removed : Boolean := False;
2680 Num_Scopes : Int := 0;
2681 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2682 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2683 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2684 Num_Inner : Int := 0;
2685 N_Instances : Int := 0;
2689 -- Case of generic unit defined in another unit
2691 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2692 Vis := Is_Immediately_Visible (Gen_Comp);
2697 and then S /= Standard_Standard
2699 Num_Scopes := Num_Scopes + 1;
2701 Use_Clauses (Num_Scopes) :=
2703 (Scope_Stack.Last - Num_Scopes + 1).
2705 End_Use_Clauses (Use_Clauses (Num_Scopes));
2707 exit when Is_Generic_Instance (S)
2708 and then (In_Package_Body (S)
2709 or else Ekind (S) = E_Procedure
2710 or else Ekind (S) = E_Function);
2714 -- Find and save all enclosing instances
2719 and then S /= Standard_Standard
2721 if Is_Generic_Instance (S) then
2722 N_Instances := N_Instances + 1;
2723 Instances (N_Instances) := S;
2729 -- Remove context of current compilation unit, unless we
2730 -- are within a nested package instantiation, in which case
2731 -- the context has been removed previously.
2733 -- If current scope is the body of a child unit, remove context
2739 and then S /= Standard_Standard
2741 exit when Is_Generic_Instance (S)
2742 and then (In_Package_Body (S)
2743 or else Ekind (S) = E_Procedure
2744 or else Ekind (S) = E_Function);
2747 or else (Ekind (Curr_Unit) = E_Package_Body
2748 and then S = Spec_Entity (Curr_Unit))
2752 -- Remove entities in current scopes from visibility, so
2753 -- than instance body is compiled in a clean environment.
2757 if Is_Child_Unit (S) then
2759 -- Remove child unit from stack, as well as inner scopes.
2760 -- Removing the context of a child unit removes parent
2763 while Current_Scope /= S loop
2764 Num_Inner := Num_Inner + 1;
2765 Inner_Scopes (Num_Inner) := Current_Scope;
2770 Remove_Context (Curr_Comp);
2774 Remove_Context (Curr_Comp);
2777 if Ekind (Curr_Unit) = E_Package_Body then
2778 Remove_Context (Library_Unit (Curr_Comp));
2785 New_Scope (Standard_Standard);
2786 Instantiate_Package_Body
2787 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2792 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2794 -- Reset Generic_Instance flag so that use clauses can be installed
2795 -- in the proper order. (See Use_One_Package for effect of enclosing
2796 -- instances on processing of use clauses).
2798 for J in 1 .. N_Instances loop
2799 Set_Is_Generic_Instance (Instances (J), False);
2803 Install_Context (Curr_Comp);
2805 if Present (Curr_Scope)
2806 and then Is_Child_Unit (Curr_Scope)
2808 New_Scope (Curr_Scope);
2809 Set_Is_Immediately_Visible (Curr_Scope);
2811 -- Finally, restore inner scopes as well.
2813 for J in reverse 1 .. Num_Inner loop
2814 New_Scope (Inner_Scopes (J));
2818 Restore_Scope_Stack;
2821 for J in reverse 1 .. Num_Scopes loop
2822 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
2824 Install_Use_Clauses (Use_Clauses (J));
2827 for J in 1 .. N_Instances loop
2828 Set_Is_Generic_Instance (Instances (J), True);
2831 -- If generic unit is in current unit, current context is correct.
2834 Instantiate_Package_Body
2835 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2837 end Inline_Instance_Body;
2839 -------------------------------------
2840 -- Analyze_Procedure_Instantiation --
2841 -------------------------------------
2843 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
2845 Analyze_Subprogram_Instantiation (N, E_Procedure);
2846 end Analyze_Procedure_Instantiation;
2848 --------------------------------------
2849 -- Analyze_Subprogram_Instantiation --
2850 --------------------------------------
2852 procedure Analyze_Subprogram_Instantiation
2856 Loc : constant Source_Ptr := Sloc (N);
2857 Gen_Id : constant Node_Id := Name (N);
2859 Act_Decl_Id : Entity_Id;
2860 Anon_Id : Entity_Id :=
2861 Make_Defining_Identifier
2862 (Sloc (Defining_Entity (N)),
2864 (Chars (Defining_Entity (N)), 'R'));
2869 Gen_Unit : Entity_Id;
2871 Pack_Id : Entity_Id;
2872 Parent_Installed : Boolean := False;
2873 Renaming_List : List_Id;
2876 procedure Analyze_Instance_And_Renamings;
2877 -- The instance must be analyzed in a context that includes the
2878 -- mappings of generic parameters into actuals. We create a package
2879 -- declaration for this purpose, and a subprogram with an internal
2880 -- name within the package. The subprogram instance is simply an
2881 -- alias for the internal subprogram, declared in the current scope.
2883 ------------------------------------
2884 -- Analyze_Instance_And_Renamings --
2885 ------------------------------------
2887 procedure Analyze_Instance_And_Renamings is
2888 Def_Ent : constant Entity_Id := Defining_Entity (N);
2889 Pack_Decl : Node_Id;
2892 if Nkind (Parent (N)) = N_Compilation_Unit then
2894 -- For the case of a compilation unit, the container package
2895 -- has the same name as the instantiation, to insure that the
2896 -- binder calls the elaboration procedure with the right name.
2897 -- Copy the entity of the instance, which may have compilation
2898 -- level flags (eg. is_child_unit) set.
2900 Pack_Id := New_Copy (Def_Ent);
2903 -- Otherwise we use the name of the instantiation concatenated
2904 -- with its source position to ensure uniqueness if there are
2905 -- several instantiations with the same name.
2908 Make_Defining_Identifier (Loc,
2909 Chars => New_External_Name
2910 (Related_Id => Chars (Def_Ent),
2912 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
2915 Pack_Decl := Make_Package_Declaration (Loc,
2916 Specification => Make_Package_Specification (Loc,
2917 Defining_Unit_Name => Pack_Id,
2918 Visible_Declarations => Renaming_List,
2919 End_Label => Empty));
2921 Set_Instance_Spec (N, Pack_Decl);
2922 Set_Is_Generic_Instance (Pack_Id);
2924 -- Case of not a compilation unit
2926 if Nkind (Parent (N)) /= N_Compilation_Unit then
2927 Mark_Rewrite_Insertion (Pack_Decl);
2928 Insert_Before (N, Pack_Decl);
2929 Set_Has_Completion (Pack_Id);
2931 -- Case of an instantiation that is a compilation unit
2933 -- Place declaration on current node so context is complete
2934 -- for analysis (including nested instantiations), and for
2935 -- use in a context_clause (see Analyze_With_Clause).
2938 Set_Unit (Parent (N), Pack_Decl);
2939 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
2942 Analyze (Pack_Decl);
2943 Check_Formal_Packages (Pack_Id);
2944 Set_Is_Generic_Instance (Pack_Id, False);
2946 -- Body of the enclosing package is supplied when instantiating
2947 -- the subprogram body, after semantic analysis is completed.
2949 if Nkind (Parent (N)) = N_Compilation_Unit then
2951 -- Remove package itself from visibility, so it does not
2952 -- conflict with subprogram.
2954 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
2956 -- Set name and scope of internal subprogram so that the
2957 -- proper external name will be generated. The proper scope
2958 -- is the scope of the wrapper package.
2960 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
2961 Set_Scope (Anon_Id, Scope (Pack_Id));
2964 Set_Is_Generic_Instance (Anon_Id);
2965 Act_Decl_Id := New_Copy (Anon_Id);
2967 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
2968 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
2969 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
2970 Set_Comes_From_Source (Act_Decl_Id, True);
2972 -- The signature may involve types that are not frozen yet, but
2973 -- the subprogram will be frozen at the point the wrapper package
2974 -- is frozen, so it does not need its own freeze node. In fact, if
2975 -- one is created, it might conflict with the freezing actions from
2976 -- the wrapper package (see 7206-013).
2978 Set_Has_Delayed_Freeze (Anon_Id, False);
2980 -- If the instance is a child unit, mark the Id accordingly. Mark
2981 -- the anonymous entity as well, which is the real subprogram and
2982 -- which is used when the instance appears in a context clause.
2984 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
2985 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
2986 New_Overloaded_Entity (Act_Decl_Id);
2987 Check_Eliminated (Act_Decl_Id);
2989 -- In compilation unit case, kill elaboration checks on the
2990 -- instantiation, since they are never needed -- the body is
2991 -- instantiated at the same point as the spec.
2993 if Nkind (Parent (N)) = N_Compilation_Unit then
2994 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2995 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2996 Set_Is_Compilation_Unit (Anon_Id);
2998 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3001 -- The instance is not a freezing point for the new subprogram.
3003 Set_Is_Frozen (Act_Decl_Id, False);
3005 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3006 Valid_Operator_Definition (Act_Decl_Id);
3009 Set_Alias (Act_Decl_Id, Anon_Id);
3010 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3011 Set_Has_Completion (Act_Decl_Id);
3012 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3014 if Nkind (Parent (N)) = N_Compilation_Unit then
3015 Set_Body_Required (Parent (N), False);
3018 end Analyze_Instance_And_Renamings;
3020 -- Start of processing for Analyze_Subprogram_Instantiation
3023 -- Very first thing: apply the special kludge for Text_IO processing
3024 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3025 -- Of course such an instantiation is bogus (these are packages, not
3026 -- subprograms), but we get a better error message if we do this.
3028 Text_IO_Kludge (Gen_Id);
3030 -- Make node global for error reporting.
3032 Instantiation_Node := N;
3033 Pre_Analyze_Actuals (N);
3035 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3036 Gen_Unit := Entity (Gen_Id);
3038 Generate_Reference (Gen_Unit, Gen_Id);
3040 if Nkind (Gen_Id) = N_Identifier
3041 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3044 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3047 if Etype (Gen_Unit) = Any_Type then return; end if;
3049 -- Verify that it is a generic subprogram of the right kind, and that
3050 -- it does not lead to a circular instantiation.
3052 if Ekind (Gen_Unit) /= E_Generic_Procedure
3053 and then Ekind (Gen_Unit) /= E_Generic_Function
3055 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3057 elsif In_Open_Scopes (Gen_Unit) then
3058 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3060 elsif K = E_Procedure
3061 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3063 if Ekind (Gen_Unit) = E_Generic_Function then
3065 ("cannot instantiate generic function as procedure", Gen_Id);
3068 ("expect name of generic procedure in instantiation", Gen_Id);
3071 elsif K = E_Function
3072 and then Ekind (Gen_Unit) /= E_Generic_Function
3074 if Ekind (Gen_Unit) = E_Generic_Procedure then
3076 ("cannot instantiate generic procedure as function", Gen_Id);
3079 ("expect name of generic function in instantiation", Gen_Id);
3083 Set_Entity (Gen_Id, Gen_Unit);
3085 -- If renaming, get original unit.
3087 if Present (Renamed_Object (Gen_Unit))
3088 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3090 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3092 Gen_Unit := Renamed_Object (Gen_Unit);
3095 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3096 Error_Msg_Node_2 := Current_Scope;
3098 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3099 Circularity_Detected := True;
3103 if In_Extended_Main_Source_Unit (N) then
3104 Set_Is_Instantiated (Gen_Unit);
3105 Generate_Reference (Gen_Unit, N);
3108 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3109 Spec := Specification (Gen_Decl);
3111 -- The subprogram itself cannot contain a nested instance, so
3112 -- the current parent is left empty.
3114 Save_Env (Gen_Unit, Empty);
3116 -- Initialize renamings map, for error checking.
3118 Generic_Renamings.Set_Last (0);
3119 Generic_Renamings_HTable.Reset;
3121 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
3123 -- Copy original generic tree, to produce text for instantiation.
3127 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3129 Act_Spec := Specification (Act_Tree);
3131 Analyze_Associations
3133 Generic_Formal_Declarations (Act_Tree),
3134 Generic_Formal_Declarations (Gen_Decl));
3136 -- Build the subprogram declaration, which does not appear
3137 -- in the generic template, and give it a sloc consistent
3138 -- with that of the template.
3140 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3141 Set_Generic_Parent (Act_Spec, Gen_Unit);
3143 Make_Subprogram_Declaration (Sloc (Act_Spec),
3144 Specification => Act_Spec);
3146 Set_Categorization_From_Pragmas (Act_Decl);
3148 if Parent_Installed then
3152 Append (Act_Decl, Renaming_List);
3153 Analyze_Instance_And_Renamings;
3155 -- If the generic is marked Import (Intrinsic), then so is the
3156 -- instance. This indicates that there is no body to instantiate.
3157 -- If generic is marked inline, so it the instance, and the
3158 -- anonymous subprogram it renames. If inlined, or else if inlining
3159 -- is enabled for the compilation, we generate the instance body
3160 -- even if it is not within the main unit.
3162 -- Any other pragmas might also be inherited ???
3164 if Is_Intrinsic_Subprogram (Gen_Unit) then
3165 Set_Is_Intrinsic_Subprogram (Anon_Id);
3166 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3168 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3169 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3173 Generate_Definition (Act_Decl_Id);
3175 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3176 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3178 Check_Elab_Instantiation (N);
3179 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3181 -- Subject to change, pending on if other pragmas are inherited ???
3183 Validate_Categorization_Dependency (N, Act_Decl_Id);
3185 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3187 if not Generic_Separately_Compiled (Gen_Unit) then
3188 Inherit_Context (Gen_Decl, N);
3191 Restore_Private_Views (Pack_Id, False);
3193 -- If the context requires a full instantiation, mark node for
3194 -- subsequent construction of the body.
3196 if (Is_In_Main_Unit (N)
3197 or else Is_Inlined (Act_Decl_Id))
3198 and then (Operating_Mode = Generate_Code
3199 or else (Operating_Mode = Check_Semantics
3200 and then Tree_Output))
3201 and then (Expander_Active or else Tree_Output)
3202 and then not ABE_Is_Certain (N)
3203 and then not Is_Eliminated (Act_Decl_Id)
3205 Pending_Instantiations.Increment_Last;
3206 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3207 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3208 Check_Forward_Instantiation (Gen_Decl);
3210 -- The wrapper package is always delayed, because it does
3211 -- not constitute a freeze point, but to insure that the
3212 -- freeze node is placed properly, it is created directly
3213 -- when instantiating the body (otherwise the freeze node
3214 -- might appear to early for nested instantiations).
3216 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3218 -- For ASIS purposes, indicate that the wrapper package has
3219 -- replaced the instantiation node.
3221 Rewrite (N, Unit (Parent (N)));
3222 Set_Unit (Parent (N), N);
3225 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3227 -- Replace instance node for library-level instantiations
3228 -- of intrinsic subprograms, for ASIS use.
3230 Rewrite (N, Unit (Parent (N)));
3231 Set_Unit (Parent (N), N);
3234 if Parent_Installed then
3239 Generic_Renamings.Set_Last (0);
3240 Generic_Renamings_HTable.Reset;
3244 when Instantiation_Error =>
3245 if Parent_Installed then
3248 end Analyze_Subprogram_Instantiation;
3250 -------------------------
3251 -- Get_Associated_Node --
3252 -------------------------
3254 function Get_Associated_Node (N : Node_Id) return Node_Id is
3255 Assoc : Node_Id := Associated_Node (N);
3258 if Nkind (Assoc) /= Nkind (N) then
3261 elsif Nkind (Assoc) = N_Aggregate
3262 or else Nkind (Assoc) = N_Extension_Aggregate
3266 -- If the node is part of an inner generic, it may itself have been
3267 -- remapped into a further generic copy. Associated_Node is otherwise
3268 -- used for the entity of the node, and will be of a different node
3269 -- kind, or else N has been rewritten as a literal or function call.
3271 while Present (Associated_Node (Assoc))
3272 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3274 Assoc := Associated_Node (Assoc);
3277 -- Follow and additional link in case the final node was rewritten.
3278 -- This can only happen with nested generic units.
3280 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3281 and then Present (Associated_Node (Assoc))
3282 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3284 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3286 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3288 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3290 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3292 Assoc := Associated_Node (Assoc);
3297 end Get_Associated_Node;
3299 -------------------------------------------
3300 -- Build_Instance_Compilation_Unit_Nodes --
3301 -------------------------------------------
3303 procedure Build_Instance_Compilation_Unit_Nodes
3308 Decl_Cunit : Node_Id;
3309 Body_Cunit : Node_Id;
3311 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3312 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3315 -- A new compilation unit node is built for the instance declaration
3318 Make_Compilation_Unit (Sloc (N),
3319 Context_Items => Empty_List,
3322 Make_Compilation_Unit_Aux (Sloc (N)));
3324 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3325 Set_Body_Required (Decl_Cunit, True);
3327 -- We use the original instantiation compilation unit as the resulting
3328 -- compilation unit of the instance, since this is the main unit.
3330 Rewrite (N, Act_Body);
3331 Body_Cunit := Parent (N);
3333 -- The two compilation unit nodes are linked by the Library_Unit field
3335 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3336 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3338 -- If the instance is not the main unit, its context, categorization,
3339 -- and elaboration entity are not relevant to the compilation.
3341 if Parent (N) /= Cunit (Main_Unit) then
3345 -- The context clause items on the instantiation, which are now
3346 -- attached to the body compilation unit (since the body overwrote
3347 -- the original instantiation node), semantically belong on the spec,
3348 -- so copy them there. It's harmless to leave them on the body as well.
3349 -- In fact one could argue that they belong in both places.
3351 Citem := First (Context_Items (Body_Cunit));
3352 while Present (Citem) loop
3353 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3357 -- Propagate categorization flags on packages, so that they appear
3358 -- in ali file for the spec of the unit.
3360 if Ekind (New_Main) = E_Package then
3361 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3362 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3363 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3364 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3365 Set_Is_Remote_Call_Interface
3366 (Old_Main, Is_Remote_Call_Interface (New_Main));
3369 -- Make entry in Units table, so that binder can generate call to
3370 -- elaboration procedure for body, if any.
3372 Make_Instance_Unit (Body_Cunit);
3373 Main_Unit_Entity := New_Main;
3374 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3376 -- Build elaboration entity, since the instance may certainly
3377 -- generate elaboration code requiring a flag for protection.
3379 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3380 end Build_Instance_Compilation_Unit_Nodes;
3382 -----------------------------------
3383 -- Check_Formal_Package_Instance --
3384 -----------------------------------
3386 -- If the formal has specific parameters, they must match those of the
3387 -- actual. Both of them are instances, and the renaming declarations
3388 -- for their formal parameters appear in the same order in both. The
3389 -- analyzed formal has been analyzed in the context of the current
3392 procedure Check_Formal_Package_Instance
3393 (Formal_Pack : Entity_Id;
3394 Actual_Pack : Entity_Id)
3396 E1 : Entity_Id := First_Entity (Actual_Pack);
3397 E2 : Entity_Id := First_Entity (Formal_Pack);
3402 procedure Check_Mismatch (B : Boolean);
3403 -- Common error routine for mismatch between the parameters of
3404 -- the actual instance and those of the formal package.
3406 procedure Check_Mismatch (B : Boolean) is
3410 ("actual for & in actual instance does not match formal",
3411 Parent (Actual_Pack), E1);
3415 -- Start of processing for Check_Formal_Package_Instance
3419 and then Present (E2)
3421 exit when Ekind (E1) = E_Package
3422 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3424 if Is_Type (E1) then
3426 -- Subtypes must statically match. E1 and E2 are the
3427 -- local entities that are subtypes of the actuals.
3428 -- Itypes generated for other parameters need not be checked,
3429 -- the check will be performed on the parameters themselves.
3431 if not Is_Itype (E1)
3432 and then not Is_Itype (E2)
3436 or else Etype (E1) /= Etype (E2)
3437 or else not Subtypes_Statically_Match (E1, E2));
3440 elsif Ekind (E1) = E_Constant then
3442 -- IN parameters must denote the same static value, or
3443 -- the same constant, or the literal null.
3445 Expr1 := Expression (Parent (E1));
3447 if Ekind (E2) /= E_Constant then
3448 Check_Mismatch (True);
3451 Expr2 := Expression (Parent (E2));
3454 if Is_Static_Expression (Expr1) then
3456 if not Is_Static_Expression (Expr2) then
3457 Check_Mismatch (True);
3459 elsif Is_Integer_Type (Etype (E1)) then
3462 V1 : Uint := Expr_Value (Expr1);
3463 V2 : Uint := Expr_Value (Expr2);
3465 Check_Mismatch (V1 /= V2);
3468 elsif Is_Real_Type (Etype (E1)) then
3471 V1 : Ureal := Expr_Value_R (Expr1);
3472 V2 : Ureal := Expr_Value_R (Expr2);
3474 Check_Mismatch (V1 /= V2);
3477 elsif Is_String_Type (Etype (E1))
3478 and then Nkind (Expr1) = N_String_Literal
3481 if Nkind (Expr2) /= N_String_Literal then
3482 Check_Mismatch (True);
3485 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3489 elsif Is_Entity_Name (Expr1) then
3490 if Is_Entity_Name (Expr2) then
3491 if Entity (Expr1) = Entity (Expr2) then
3494 elsif Ekind (Entity (Expr2)) = E_Constant
3495 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3497 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3501 Check_Mismatch (True);
3504 Check_Mismatch (True);
3507 elsif Nkind (Expr1) = N_Null then
3508 Check_Mismatch (Nkind (Expr1) /= N_Null);
3511 Check_Mismatch (True);
3514 elsif Ekind (E1) = E_Variable
3515 or else Ekind (E1) = E_Package
3518 (Ekind (E1) /= Ekind (E2)
3519 or else Renamed_Object (E1) /= Renamed_Object (E2));
3521 elsif Is_Overloadable (E1) then
3523 -- Verify that the names of the entities match.
3524 -- What if actual is an attribute ???
3527 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3530 raise Program_Error;
3537 end Check_Formal_Package_Instance;
3539 ---------------------------
3540 -- Check_Formal_Packages --
3541 ---------------------------
3543 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3545 Formal_P : Entity_Id;
3548 -- Iterate through the declarations in the instance, looking for
3549 -- package renaming declarations that denote instances of formal
3550 -- packages. Stop when we find the renaming of the current package
3551 -- itself. The declaration for a formal package without a box is
3552 -- followed by an internal entity that repeats the instantiation.
3554 E := First_Entity (P_Id);
3555 while Present (E) loop
3556 if Ekind (E) = E_Package then
3557 if Renamed_Object (E) = P_Id then
3560 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3563 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3564 Formal_P := Next_Entity (E);
3565 Check_Formal_Package_Instance (Formal_P, E);
3571 end Check_Formal_Packages;
3573 ---------------------------------
3574 -- Check_Forward_Instantiation --
3575 ---------------------------------
3577 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3579 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3582 -- The instantiation appears before the generic body if we are in the
3583 -- scope of the unit containing the generic, either in its spec or in
3584 -- the package body. and before the generic body.
3586 if Ekind (Gen_Comp) = E_Package_Body then
3587 Gen_Comp := Spec_Entity (Gen_Comp);
3590 if In_Open_Scopes (Gen_Comp)
3591 and then No (Corresponding_Body (Decl))
3596 and then not Is_Compilation_Unit (S)
3597 and then not Is_Child_Unit (S)
3599 if Ekind (S) = E_Package then
3600 Set_Has_Forward_Instantiation (S);
3606 end Check_Forward_Instantiation;
3608 ---------------------------
3609 -- Check_Generic_Actuals --
3610 ---------------------------
3612 -- The visibility of the actuals may be different between the
3613 -- point of generic instantiation and the instantiation of the body.
3615 procedure Check_Generic_Actuals
3616 (Instance : Entity_Id;
3617 Is_Formal_Box : Boolean)
3623 E := First_Entity (Instance);
3624 while Present (E) loop
3626 and then Nkind (Parent (E)) = N_Subtype_Declaration
3627 and then Scope (Etype (E)) /= Instance
3628 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3630 Check_Private_View (Subtype_Indication (Parent (E)));
3631 Set_Is_Generic_Actual_Type (E, True);
3632 Set_Is_Hidden (E, False);
3634 -- We constructed the generic actual type as a subtype of
3635 -- the supplied type. This means that it normally would not
3636 -- inherit subtype specific attributes of the actual, which
3637 -- is wrong for the generic case.
3639 Astype := Ancestor_Subtype (E);
3643 -- can happen when E is an itype that is the full view of
3644 -- a private type completed, e.g. with a constrained array.
3646 Astype := Base_Type (E);
3649 Set_Size_Info (E, (Astype));
3650 Set_RM_Size (E, RM_Size (Astype));
3651 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3653 if Is_Discrete_Or_Fixed_Point_Type (E) then
3654 Set_RM_Size (E, RM_Size (Astype));
3656 -- In nested instances, the base type of an access actual
3657 -- may itself be private, and need to be exchanged.
3659 elsif Is_Access_Type (E)
3660 and then Is_Private_Type (Etype (E))
3663 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3666 elsif Ekind (E) = E_Package then
3668 -- If this is the renaming for the current instance, we're done.
3669 -- Otherwise it is a formal package. If the corresponding formal
3670 -- was declared with a box, the (instantiations of the) generic
3671 -- formal part are also visible. Otherwise, ignore the entity
3672 -- created to validate the actuals.
3674 if Renamed_Object (E) = Instance then
3677 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3680 -- The visibility of a formal of an enclosing generic is already
3683 elsif Denotes_Formal_Package (E) then
3686 elsif Present (Associated_Formal_Package (E))
3687 and then Box_Present (Parent (Associated_Formal_Package (E)))
3689 Check_Generic_Actuals (Renamed_Object (E), True);
3690 Set_Is_Hidden (E, False);
3694 Set_Is_Hidden (E, not Is_Formal_Box);
3700 end Check_Generic_Actuals;
3702 ------------------------------
3703 -- Check_Generic_Child_Unit --
3704 ------------------------------
3706 procedure Check_Generic_Child_Unit
3708 Parent_Installed : in out Boolean)
3710 Loc : constant Source_Ptr := Sloc (Gen_Id);
3711 Gen_Par : Entity_Id := Empty;
3712 Inst_Par : Entity_Id;
3716 function Find_Generic_Child
3720 -- Search generic parent for possible child unit.
3722 function In_Enclosing_Instance return Boolean;
3723 -- Within an instance of the parent, the child unit may be denoted
3724 -- by a simple name. Examine enclosing scopes to locate a possible
3725 -- parent instantiation.
3727 function Find_Generic_Child
3735 -- If entity of name is already set, instance has already been
3736 -- resolved, e.g. in an enclosing instantiation.
3738 if Present (Entity (Id)) then
3739 if Scope (Entity (Id)) = Scop then
3746 E := First_Entity (Scop);
3747 while Present (E) loop
3748 if Chars (E) = Chars (Id)
3749 and then Is_Child_Unit (E)
3751 if Is_Child_Unit (E)
3752 and then not Is_Visible_Child_Unit (E)
3755 ("generic child unit& is not visible", Gen_Id, E);
3767 end Find_Generic_Child;
3769 function In_Enclosing_Instance return Boolean is
3770 Enclosing_Instance : Node_Id;
3773 Enclosing_Instance := Current_Scope;
3775 while Present (Enclosing_Instance) loop
3776 exit when Ekind (Enclosing_Instance) = E_Package
3777 and then Nkind (Parent (Enclosing_Instance)) =
3778 N_Package_Specification
3780 (Generic_Parent (Parent (Enclosing_Instance)));
3782 Enclosing_Instance := Scope (Enclosing_Instance);
3785 if Present (Enclosing_Instance) then
3786 E := Find_Generic_Child
3787 (Generic_Parent (Parent (Enclosing_Instance)), Gen_Id);
3794 Make_Expanded_Name (Loc,
3796 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
3797 Selector_Name => New_Occurrence_Of (E, Loc)));
3799 Set_Entity (Gen_Id, E);
3800 Set_Etype (Gen_Id, Etype (E));
3801 Parent_Installed := False; -- Already in scope.
3807 end In_Enclosing_Instance;
3809 -- Start of processing for Check_Generic_Child_Unit
3812 -- If the name of the generic is given by a selected component, it
3813 -- may be the name of a generic child unit, and the prefix is the name
3814 -- of an instance of the parent, in which case the child unit must be
3815 -- visible. If this instance is not in scope, it must be placed there
3816 -- and removed after instantiation, because what is being instantiated
3817 -- is not the original child, but the corresponding child present in
3818 -- the instance of the parent.
3820 -- If the child is instantiated within the parent, it can be given by
3821 -- a simple name. In this case the instance is already in scope, but
3822 -- the child generic must be recovered from the generic parent as well.
3824 if Nkind (Gen_Id) = N_Selected_Component then
3825 S := Selector_Name (Gen_Id);
3826 Analyze (Prefix (Gen_Id));
3827 Inst_Par := Entity (Prefix (Gen_Id));
3829 if Ekind (Inst_Par) = E_Package
3830 and then Present (Renamed_Object (Inst_Par))
3832 Inst_Par := Renamed_Object (Inst_Par);
3835 if Ekind (Inst_Par) = E_Package then
3836 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
3837 Gen_Par := Generic_Parent (Parent (Inst_Par));
3839 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
3841 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
3843 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
3846 elsif Ekind (Inst_Par) = E_Generic_Package
3847 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
3850 -- A formal package may be a real child package, and not the
3851 -- implicit instance within a parent. In this case the child is
3852 -- not visible and has to be retrieved explicitly as well.
3854 Gen_Par := Inst_Par;
3857 if Present (Gen_Par) then
3859 -- The prefix denotes an instantiation. The entity itself
3860 -- may be a nested generic, or a child unit.
3862 E := Find_Generic_Child (Gen_Par, S);
3865 Change_Selected_Component_To_Expanded_Name (Gen_Id);
3866 Set_Entity (Gen_Id, E);
3867 Set_Etype (Gen_Id, Etype (E));
3869 Set_Etype (S, Etype (E));
3871 -- Indicate that this is a reference to the parent.
3873 if In_Extended_Main_Source_Unit (Gen_Id) then
3874 Set_Is_Instantiated (Inst_Par);
3877 -- A common mistake is to replicate the naming scheme of
3878 -- a hierarchy by instantiating a generic child directly,
3879 -- rather than the implicit child in a parent instance:
3881 -- generic .. package Gpar is ..
3882 -- generic .. package Gpar.Child is ..
3883 -- package Par is new Gpar ();
3886 -- package Par.Child is new Gpar.Child ();
3887 -- rather than Par.Child
3889 -- In this case the instantiation is within Par, which is
3890 -- an instance, but Gpar does not denote Par because we are
3891 -- not IN the instance of Gpar, so this is illegal. The test
3892 -- below recognizes this particular case.
3894 if Is_Child_Unit (E)
3895 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
3896 and then (not In_Instance
3897 or else Nkind (Parent (Parent (Gen_Id))) =
3901 ("prefix of generic child unit must be instance of parent",
3905 if not In_Open_Scopes (Inst_Par)
3906 and then Nkind (Parent (Gen_Id))
3907 not in N_Generic_Renaming_Declaration
3909 Install_Parent (Inst_Par);
3910 Parent_Installed := True;
3914 -- If the generic parent does not contain an entity that
3915 -- corresponds to the selector, the instance doesn't either.
3916 -- Analyzing the node will yield the appropriate error message.
3917 -- If the entity is not a child unit, then it is an inner
3918 -- generic in the parent.
3926 if Is_Child_Unit (Entity (Gen_Id))
3927 and then Nkind (Parent (Gen_Id))
3928 not in N_Generic_Renaming_Declaration
3929 and then not In_Open_Scopes (Inst_Par)
3931 Install_Parent (Inst_Par);
3932 Parent_Installed := True;
3936 elsif Nkind (Gen_Id) = N_Expanded_Name then
3938 -- Entity already present, analyze prefix, whose meaning may be
3939 -- an instance in the current context. If it is an instance of
3940 -- a relative within another, the proper parent may still have
3941 -- to be installed, if they are not of the same generation.
3943 Analyze (Prefix (Gen_Id));
3944 Inst_Par := Entity (Prefix (Gen_Id));
3946 if In_Enclosing_Instance then
3949 elsif Present (Entity (Gen_Id))
3950 and then Is_Child_Unit (Entity (Gen_Id))
3951 and then not In_Open_Scopes (Inst_Par)
3953 Install_Parent (Inst_Par);
3954 Parent_Installed := True;
3957 elsif In_Enclosing_Instance then
3958 -- The child unit is found in some enclosing scope.
3964 -- If this is the renaming of the implicit child in a parent
3965 -- instance, recover the parent name and install it.
3967 if Is_Entity_Name (Gen_Id) then
3968 E := Entity (Gen_Id);
3970 if Is_Generic_Unit (E)
3971 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
3972 and then Is_Child_Unit (Renamed_Object (E))
3973 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
3974 and then Nkind (Name (Parent (E))) = N_Expanded_Name
3977 New_Copy_Tree (Name (Parent (E))));
3978 Inst_Par := Entity (Prefix (Gen_Id));
3980 if not In_Open_Scopes (Inst_Par) then
3981 Install_Parent (Inst_Par);
3982 Parent_Installed := True;
3985 -- If it is a child unit of a non-generic parent, it may be
3986 -- use-visible and given by a direct name. Install parent as
3989 elsif Is_Generic_Unit (E)
3990 and then Is_Child_Unit (E)
3992 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
3993 and then not Is_Generic_Unit (Scope (E))
3995 if not In_Open_Scopes (Scope (E)) then
3996 Install_Parent (Scope (E));
3997 Parent_Installed := True;
4002 end Check_Generic_Child_Unit;
4004 -----------------------------
4005 -- Check_Hidden_Child_Unit --
4006 -----------------------------
4008 procedure Check_Hidden_Child_Unit
4010 Gen_Unit : Entity_Id;
4011 Act_Decl_Id : Entity_Id)
4013 Gen_Id : Node_Id := Name (N);
4016 if Is_Child_Unit (Gen_Unit)
4017 and then Is_Child_Unit (Act_Decl_Id)
4018 and then Nkind (Gen_Id) = N_Expanded_Name
4019 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4020 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4022 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4024 ("generic unit & is implicitly declared in &",
4025 Defining_Unit_Name (N), Gen_Unit);
4026 Error_Msg_N ("\instance must have different name",
4027 Defining_Unit_Name (N));
4029 end Check_Hidden_Child_Unit;
4031 ------------------------
4032 -- Check_Private_View --
4033 ------------------------
4035 procedure Check_Private_View (N : Node_Id) is
4036 T : constant Entity_Id := Etype (N);
4040 -- Exchange views if the type was not private in the generic but is
4041 -- private at the point of instantiation. Do not exchange views if
4042 -- the scope of the type is in scope. This can happen if both generic
4043 -- and instance are sibling units, or if type is defined in a parent.
4044 -- In this case the visibility of the type will be correct for all
4048 BT := Base_Type (T);
4050 if Is_Private_Type (T)
4051 and then not Has_Private_View (N)
4052 and then Present (Full_View (T))
4053 and then not In_Open_Scopes (Scope (T))
4055 -- In the generic, the full type was visible. Save the
4056 -- private entity, for subsequent exchange.
4060 elsif Has_Private_View (N)
4061 and then not Is_Private_Type (T)
4062 and then not Has_Been_Exchanged (T)
4063 and then Etype (Get_Associated_Node (N)) /= T
4065 -- Only the private declaration was visible in the generic. If
4066 -- the type appears in a subtype declaration, the subtype in the
4067 -- instance must have a view compatible with that of its parent,
4068 -- which must be exchanged (see corresponding code in Restore_
4069 -- Private_Views). Otherwise, if the type is defined in a parent
4070 -- unit, leave full visibility within instance, which is safe.
4072 if In_Open_Scopes (Scope (Base_Type (T)))
4073 and then not Is_Private_Type (Base_Type (T))
4074 and then Comes_From_Source (Base_Type (T))
4078 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4079 or else not In_Private_Part (Scope (Base_Type (T)))
4081 Append_Elmt (T, Exchanged_Views);
4082 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4085 -- For composite types with inconsistent representation
4086 -- exchange component types accordingly.
4088 elsif Is_Access_Type (T)
4089 and then Is_Private_Type (Designated_Type (T))
4090 and then Present (Full_View (Designated_Type (T)))
4092 Switch_View (Designated_Type (T));
4094 elsif Is_Array_Type (T)
4095 and then Is_Private_Type (Component_Type (T))
4096 and then not Has_Private_View (N)
4097 and then Present (Full_View (Component_Type (T)))
4099 Switch_View (Component_Type (T));
4101 elsif Is_Private_Type (T)
4102 and then Present (Full_View (T))
4103 and then Is_Array_Type (Full_View (T))
4104 and then Is_Private_Type (Component_Type (Full_View (T)))
4108 -- Finally, a non-private subtype may have a private base type,
4109 -- which must be exchanged for consistency. This can happen when
4110 -- instantiating a package body, when the scope stack is empty but
4111 -- in fact the subtype and the base type are declared in an enclosing
4114 elsif not Is_Private_Type (T)
4115 and then not Has_Private_View (N)
4116 and then Is_Private_Type (Base_Type (T))
4117 and then Present (Full_View (BT))
4118 and then not Is_Generic_Type (BT)
4119 and then not In_Open_Scopes (BT)
4121 Append_Elmt (Full_View (BT), Exchanged_Views);
4122 Exchange_Declarations (BT);
4125 end Check_Private_View;
4127 --------------------------
4128 -- Contains_Instance_Of --
4129 --------------------------
4131 function Contains_Instance_Of
4143 -- Verify that there are no circular instantiations. We check whether
4144 -- the unit contains an instance of the current scope or some enclosing
4145 -- scope (in case one of the instances appears in a subunit). Longer
4146 -- circularities involving subunits might seem too pathological to
4147 -- consider, but they were not too pathological for the authors of
4148 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4149 -- enclosing generic scopes as containing an instance.
4152 -- Within a generic subprogram body, the scope is not generic, to
4153 -- allow for recursive subprograms. Use the declaration to determine
4154 -- whether this is a generic unit.
4156 if Ekind (Scop) = E_Generic_Package
4157 or else (Is_Subprogram (Scop)
4158 and then Nkind (Unit_Declaration_Node (Scop)) =
4159 N_Generic_Subprogram_Declaration)
4161 Elmt := First_Elmt (Inner_Instances (Inner));
4163 while Present (Elmt) loop
4164 if Node (Elmt) = Scop then
4165 Error_Msg_Node_2 := Inner;
4167 ("circular Instantiation: & instantiated within &!",
4171 elsif Node (Elmt) = Inner then
4174 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4175 Error_Msg_Node_2 := Inner;
4177 ("circular Instantiation: & instantiated within &!",
4185 -- Indicate that Inner is being instantiated within Scop.
4187 Append_Elmt (Inner, Inner_Instances (Scop));
4190 if Scop = Standard_Standard then
4193 Scop := Scope (Scop);
4198 end Contains_Instance_Of;
4200 -----------------------
4201 -- Copy_Generic_Node --
4202 -----------------------
4204 function Copy_Generic_Node
4206 Parent_Id : Node_Id;
4207 Instantiating : Boolean)
4213 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4214 -- Check the given value of one of the Fields referenced by the
4215 -- current node to determine whether to copy it recursively. The
4216 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4217 -- value (Sloc, Uint, Char) in which case it need not be copied.
4219 procedure Copy_Descendants;
4220 -- Common utility for various nodes.
4222 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4223 -- Make copy of element list.
4225 function Copy_Generic_List
4227 Parent_Id : Node_Id)
4229 -- Apply Copy_Node recursively to the members of a node list.
4231 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4232 -- True if an identifier is part of the defining program unit name
4233 -- of a child unit. The entity of such an identifier must be kept
4234 -- (for ASIS use) even though as the name of an enclosing generic
4235 -- it would otherwise not be preserved in the generic tree.
4237 -----------------------
4238 -- Copy_Descendants --
4239 -----------------------
4241 procedure Copy_Descendants is
4243 use Atree.Unchecked_Access;
4244 -- This code section is part of the implementation of an untyped
4245 -- tree traversal, so it needs direct access to node fields.
4248 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4249 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4250 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4251 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4252 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4253 end Copy_Descendants;
4255 -----------------------------
4256 -- Copy_Generic_Descendant --
4257 -----------------------------
4259 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4261 if D = Union_Id (Empty) then
4264 elsif D in Node_Range then
4266 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4268 elsif D in List_Range then
4269 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4271 elsif D in Elist_Range then
4272 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4274 -- Nothing else is copyable (e.g. Uint values), return as is
4279 end Copy_Generic_Descendant;
4281 ------------------------
4282 -- Copy_Generic_Elist --
4283 ------------------------
4285 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4292 M := First_Elmt (E);
4293 while Present (M) loop
4295 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4304 end Copy_Generic_Elist;
4306 -----------------------
4307 -- Copy_Generic_List --
4308 -----------------------
4310 function Copy_Generic_List
4312 Parent_Id : Node_Id)
4321 Set_Parent (New_L, Parent_Id);
4324 while Present (N) loop
4325 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4334 end Copy_Generic_List;
4336 ---------------------------
4337 -- In_Defining_Unit_Name --
4338 ---------------------------
4340 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4342 return Present (Parent (Nam))
4343 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4345 (Nkind (Parent (Nam)) = N_Expanded_Name
4346 and then In_Defining_Unit_Name (Parent (Nam))));
4347 end In_Defining_Unit_Name;
4349 -- Start of processing for Copy_Generic_Node
4356 New_N := New_Copy (N);
4358 if Instantiating then
4359 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4362 if not Is_List_Member (N) then
4363 Set_Parent (New_N, Parent_Id);
4366 -- If defining identifier, then all fields have been copied already
4368 if Nkind (New_N) in N_Entity then
4371 -- Special casing for identifiers and other entity names and operators
4373 elsif (Nkind (New_N) = N_Identifier
4374 or else Nkind (New_N) = N_Character_Literal
4375 or else Nkind (New_N) = N_Expanded_Name
4376 or else Nkind (New_N) = N_Operator_Symbol
4377 or else Nkind (New_N) in N_Op)
4379 if not Instantiating then
4381 -- Link both nodes in order to assign subsequently the
4382 -- entity of the copy to the original node, in case this
4383 -- is a global reference.
4385 Set_Associated_Node (N, New_N);
4387 -- If we are within an instantiation, this is a nested generic
4388 -- that has already been analyzed at the point of definition. We
4389 -- must preserve references that were global to the enclosing
4390 -- parent at that point. Other occurrences, whether global or
4391 -- local to the current generic, must be resolved anew, so we
4392 -- reset the entity in the generic copy. A global reference has
4393 -- a smaller depth than the parent, or else the same depth in
4394 -- case both are distinct compilation units.
4396 -- It is also possible for Current_Instantiated_Parent to be
4397 -- defined, and for this not to be a nested generic, namely
4398 -- if the unit is loaded through Rtsfind. In that case, the
4399 -- entity of New_N is only a link to the associated node, and
4400 -- not a defining occurrence.
4402 -- The entities for parent units in the defining_program_unit
4403 -- of a generic child unit are established when the context of
4404 -- the unit is first analyzed, before the generic copy is made.
4405 -- They are preserved in the copy for use in ASIS queries.
4407 Ent := Entity (New_N);
4409 if No (Current_Instantiated_Parent.Gen_Id) then
4411 or else Nkind (Ent) /= N_Defining_Identifier
4412 or else not In_Defining_Unit_Name (N)
4414 Set_Associated_Node (New_N, Empty);
4419 not (Nkind (Ent) = N_Defining_Identifier
4421 Nkind (Ent) = N_Defining_Character_Literal
4423 Nkind (Ent) = N_Defining_Operator_Symbol)
4424 or else No (Scope (Ent))
4425 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4426 or else (Scope_Depth (Scope (Ent)) >
4427 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4429 Get_Source_Unit (Ent) =
4430 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4432 Set_Associated_Node (New_N, Empty);
4435 -- Case of instantiating identifier or some other name or operator
4438 -- If the associated node is still defined, the entity in
4439 -- it is global, and must be copied to the instance.
4441 if Present (Get_Associated_Node (N)) then
4442 if Nkind (Get_Associated_Node (N)) = Nkind (N) then
4443 Set_Entity (New_N, Entity (Get_Associated_Node (N)));
4444 Check_Private_View (N);
4446 elsif Nkind (Get_Associated_Node (N)) = N_Function_Call then
4447 Set_Entity (New_N, Entity (Name (Get_Associated_Node (N))));
4450 Set_Entity (New_N, Empty);
4455 -- For expanded name, we must copy the Prefix and Selector_Name
4457 if Nkind (N) = N_Expanded_Name then
4460 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4462 Set_Selector_Name (New_N,
4463 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4465 -- For operators, we must copy the right operand
4467 elsif Nkind (N) in N_Op then
4469 Set_Right_Opnd (New_N,
4470 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4472 -- And for binary operators, the left operand as well
4474 if Nkind (N) in N_Binary_Op then
4475 Set_Left_Opnd (New_N,
4476 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4480 -- Special casing for stubs
4482 elsif Nkind (N) in N_Body_Stub then
4484 -- In any case, we must copy the specification or defining
4485 -- identifier as appropriate.
4487 if Nkind (N) = N_Subprogram_Body_Stub then
4488 Set_Specification (New_N,
4489 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4492 Set_Defining_Identifier (New_N,
4494 (Defining_Identifier (N), New_N, Instantiating));
4497 -- If we are not instantiating, then this is where we load and
4498 -- analyze subunits, i.e. at the point where the stub occurs. A
4499 -- more permissivle system might defer this analysis to the point
4500 -- of instantiation, but this seems to complicated for now.
4502 if not Instantiating then
4504 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4506 Unum : Unit_Number_Type;
4512 (Load_Name => Subunit_Name,
4517 -- If the proper body is not found, a warning message will
4518 -- be emitted when analyzing the stub, or later at the the
4519 -- point of instantiation. Here we just leave the stub as is.
4521 if Unum = No_Unit then
4522 Subunits_Missing := True;
4523 goto Subunit_Not_Found;
4526 Subunit := Cunit (Unum);
4528 -- We must create a generic copy of the subunit, in order
4529 -- to perform semantic analysis on it, and we must replace
4530 -- the stub in the original generic unit with the subunit,
4531 -- in order to preserve non-local references within.
4533 -- Only the proper body needs to be copied. Library_Unit and
4534 -- context clause are simply inherited by the generic copy.
4535 -- Note that the copy (which may be recursive if there are
4536 -- nested subunits) must be done first, before attaching it
4537 -- to the enclosing generic.
4541 (Proper_Body (Unit (Subunit)),
4542 Empty, Instantiating => False);
4544 -- Now place the original proper body in the original
4545 -- generic unit. This is a body, not a compilation unit.
4547 Rewrite (N, Proper_Body (Unit (Subunit)));
4548 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4549 Set_Was_Originally_Stub (N);
4551 -- Finally replace the body of the subunit with its copy,
4552 -- and make this new subunit into the library unit of the
4553 -- generic copy, which does not have stubs any longer.
4555 Set_Proper_Body (Unit (Subunit), New_Body);
4556 Set_Library_Unit (New_N, Subunit);
4557 Inherit_Context (Unit (Subunit), N);
4561 -- If we are instantiating, this must be an error case, since
4562 -- otherwise we would have replaced the stub node by the proper
4563 -- body that corresponds. So just ignore it in the copy (i.e.
4564 -- we have copied it, and that is good enough).
4570 <<Subunit_Not_Found>> null;
4572 -- If the node is a compilation unit, it is the subunit of a stub,
4573 -- which has been loaded already (see code below). In this case,
4574 -- the library unit field of N points to the parent unit (which
4575 -- is a compilation unit) and need not (and cannot!) be copied.
4577 -- When the proper body of the stub is analyzed, thie library_unit
4578 -- link is used to establish the proper context (see sem_ch10).
4580 -- The other fields of a compilation unit are copied as usual
4582 elsif Nkind (N) = N_Compilation_Unit then
4584 -- This code can only be executed when not instantiating, because
4585 -- in the copy made for an instantiation, the compilation unit
4586 -- node has disappeared at the point that a stub is replaced by
4589 pragma Assert (not Instantiating);
4591 Set_Context_Items (New_N,
4592 Copy_Generic_List (Context_Items (N), New_N));
4595 Copy_Generic_Node (Unit (N), New_N, False));
4597 Set_First_Inlined_Subprogram (New_N,
4599 (First_Inlined_Subprogram (N), New_N, False));
4601 Set_Aux_Decls_Node (New_N,
4602 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4604 -- For an assignment node, the assignment is known to be semantically
4605 -- legal if we are instantiating the template. This avoids incorrect
4606 -- diagnostics in generated code.
4608 elsif Nkind (N) = N_Assignment_Statement then
4610 -- Copy name and expression fields in usual manner
4613 Copy_Generic_Node (Name (N), New_N, Instantiating));
4615 Set_Expression (New_N,
4616 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4618 if Instantiating then
4619 Set_Assignment_OK (Name (New_N), True);
4622 elsif Nkind (N) = N_Aggregate
4623 or else Nkind (N) = N_Extension_Aggregate
4626 if not Instantiating then
4627 Set_Associated_Node (N, New_N);
4630 if Present (Get_Associated_Node (N))
4631 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4633 -- In the generic the aggregate has some composite type.
4634 -- If at the point of instantiation the type has a private
4635 -- view, install the full view (and that of its ancestors,
4639 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4644 and then Is_Private_Type (T)
4650 and then Is_Tagged_Type (T)
4651 and then Is_Derived_Type (T)
4653 Rt := Root_Type (T);
4658 if Is_Private_Type (T) then
4669 -- Do not copy the associated node, which points to
4670 -- the generic copy of the aggregate.
4673 use Atree.Unchecked_Access;
4674 -- This code section is part of the implementation of an untyped
4675 -- tree traversal, so it needs direct access to node fields.
4678 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4679 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4680 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4681 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4684 -- Allocators do not have an identifier denoting the access type,
4685 -- so we must locate it through the expression to check whether
4686 -- the views are consistent.
4688 elsif Nkind (N) = N_Allocator
4689 and then Nkind (Expression (N)) = N_Qualified_Expression
4690 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
4691 and then Instantiating
4694 T : Node_Id := Get_Associated_Node (Subtype_Mark (Expression (N)));
4699 -- Retrieve the allocator node in the generic copy.
4701 Acc_T := Etype (Parent (Parent (T)));
4703 and then Is_Private_Type (Acc_T)
4705 Switch_View (Acc_T);
4712 -- For a proper body, we must catch the case of a proper body that
4713 -- replaces a stub. This represents the point at which a separate
4714 -- compilation unit, and hence template file, may be referenced, so
4715 -- we must make a new source instantiation entry for the template
4716 -- of the subunit, and ensure that all nodes in the subunit are
4717 -- adjusted using this new source instantiation entry.
4719 elsif Nkind (N) in N_Proper_Body then
4722 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4725 if Instantiating and then Was_Originally_Stub (N) then
4726 Create_Instantiation_Source
4727 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4730 -- Now copy the fields of the proper body, using the new
4731 -- adjustment factor if one was needed as per test above.
4735 -- Restore the original adjustment factor in case changed
4737 S_Adjustment := Save_Adjustment;
4740 -- Don't copy Ident or Comment pragmas, since the comment belongs
4741 -- to the generic unit, not to the instantiating unit.
4743 elsif Nkind (N) = N_Pragma
4744 and then Instantiating
4747 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4750 if Prag_Id = Pragma_Ident
4751 or else Prag_Id = Pragma_Comment
4753 New_N := Make_Null_Statement (Sloc (N));
4760 -- For the remaining nodes, copy recursively their descendants.
4766 and then Nkind (N) = N_Subprogram_Body
4768 Set_Generic_Parent (Specification (New_N), N);
4773 end Copy_Generic_Node;
4775 ----------------------------
4776 -- Denotes_Formal_Package --
4777 ----------------------------
4779 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4780 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4781 Scop : Entity_Id := Scope (Pack);
4785 if Ekind (Scop) = E_Generic_Package
4786 or else Nkind (Unit_Declaration_Node (Scop))
4787 = N_Generic_Subprogram_Declaration
4791 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4798 -- Check whether this package is associated with a formal
4799 -- package of the enclosing instantiation. Iterate over the
4800 -- list of renamings.
4802 E := First_Entity (Par);
4803 while Present (E) loop
4805 if Ekind (E) /= E_Package
4806 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4809 elsif Renamed_Object (E) = Par then
4812 elsif Renamed_Object (E) = Pack then
4821 end Denotes_Formal_Package;
4827 procedure End_Generic is
4829 -- ??? More things could be factored out in this
4830 -- routine. Should probably be done at a later stage.
4832 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4833 Generic_Flags.Decrement_Last;
4835 Expander_Mode_Restore;
4838 ----------------------
4839 -- Find_Actual_Type --
4840 ----------------------
4842 function Find_Actual_Type
4844 Gen_Scope : Entity_Id)
4850 if not Is_Child_Unit (Gen_Scope) then
4851 return Get_Instance_Of (Typ);
4853 elsif not Is_Generic_Type (Typ)
4854 or else Scope (Typ) = Gen_Scope
4856 return Get_Instance_Of (Typ);
4859 T := Current_Entity (Typ);
4860 while Present (T) loop
4861 if In_Open_Scopes (Scope (T)) then
4870 end Find_Actual_Type;
4872 ----------------------------
4873 -- Freeze_Subprogram_Body --
4874 ----------------------------
4876 procedure Freeze_Subprogram_Body
4877 (Inst_Node : Node_Id;
4879 Pack_Id : Entity_Id)
4882 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
4883 Par : constant Entity_Id := Scope (Gen_Unit);
4888 function Earlier (N1, N2 : Node_Id) return Boolean;
4889 -- Yields True if N1 and N2 appear in the same compilation unit,
4890 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4891 -- traversal of the tree for the unit.
4893 function Enclosing_Body (N : Node_Id) return Node_Id;
4894 -- Find innermost package body that encloses the given node, and which
4895 -- is not a compilation unit. Freeze nodes for the instance, or for its
4896 -- enclosing body, may be inserted after the enclosing_body of the
4899 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4900 -- Find entity for given package body, and locate or create a freeze
4903 function True_Parent (N : Node_Id) return Node_Id;
4904 -- For a subunit, return parent of corresponding stub.
4910 function Earlier (N1, N2 : Node_Id) return Boolean is
4916 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4917 -- Find distance from given node to enclosing compilation unit.
4919 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4922 and then Nkind (P) /= N_Compilation_Unit
4924 P := True_Parent (P);
4930 Find_Depth (P1, D1);
4931 Find_Depth (P2, D2);
4941 P1 := True_Parent (P1);
4946 P2 := True_Parent (P2);
4950 -- At this point P1 and P2 are at the same distance from the root.
4951 -- We examine their parents until we find a common declarative
4952 -- list, at which point we can establish their relative placement
4953 -- by comparing their ultimate slocs. If we reach the root,
4954 -- N1 and N2 do not descend from the same declarative list (e.g.
4955 -- one is nested in the declarative part and the other is in a block
4956 -- in the statement part) and the earlier one is already frozen.
4958 while not Is_List_Member (P1)
4959 or else not Is_List_Member (P2)
4960 or else List_Containing (P1) /= List_Containing (P2)
4962 P1 := True_Parent (P1);
4963 P2 := True_Parent (P2);
4965 if Nkind (Parent (P1)) = N_Subunit then
4966 P1 := Corresponding_Stub (Parent (P1));
4969 if Nkind (Parent (P2)) = N_Subunit then
4970 P2 := Corresponding_Stub (Parent (P2));
4979 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4982 --------------------
4983 -- Enclosing_Body --
4984 --------------------
4986 function Enclosing_Body (N : Node_Id) return Node_Id is
4987 P : Node_Id := Parent (N);
4991 and then Nkind (Parent (P)) /= N_Compilation_Unit
4993 if Nkind (P) = N_Package_Body then
4995 if Nkind (Parent (P)) = N_Subunit then
4996 return Corresponding_Stub (Parent (P));
5002 P := True_Parent (P);
5008 -------------------------
5009 -- Package_Freeze_Node --
5010 -------------------------
5012 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5016 if Nkind (B) = N_Package_Body then
5017 Id := Corresponding_Spec (B);
5019 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5020 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5023 Ensure_Freeze_Node (Id);
5024 return Freeze_Node (Id);
5025 end Package_Freeze_Node;
5031 function True_Parent (N : Node_Id) return Node_Id is
5033 if Nkind (Parent (N)) = N_Subunit then
5034 return Parent (Corresponding_Stub (Parent (N)));
5040 -- Start of processing of Freeze_Subprogram_Body
5043 -- If the instance and the generic body appear within the same
5044 -- unit, and the instance precedes the generic, the freeze node for
5045 -- the instance must appear after that of the generic. If the generic
5046 -- is nested within another instance I2, then current instance must
5047 -- be frozen after I2. In both cases, the freeze nodes are those of
5048 -- enclosing packages. Otherwise, the freeze node is placed at the end
5049 -- of the current declarative part.
5051 Enc_G := Enclosing_Body (Gen_Body);
5052 Enc_I := Enclosing_Body (Inst_Node);
5053 Ensure_Freeze_Node (Pack_Id);
5054 F_Node := Freeze_Node (Pack_Id);
5056 if Is_Generic_Instance (Par)
5057 and then Present (Freeze_Node (Par))
5059 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5061 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5062 -- The parent was a premature instantiation. Insert freeze
5063 -- node at the end the current declarative part.
5065 Insert_After_Last_Decl (Inst_Node, F_Node);
5068 Insert_After (Freeze_Node (Par), F_Node);
5071 -- The body enclosing the instance should be frozen after the body
5072 -- that includes the generic, because the body of the instance may
5073 -- make references to entities therein. If the two are not in the
5074 -- same declarative part, or if the one enclosing the instance is
5075 -- frozen already, freeze the instance at the end of the current
5076 -- declarative part.
5078 elsif Is_Generic_Instance (Par)
5079 and then Present (Freeze_Node (Par))
5080 and then Present (Enc_I)
5082 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5084 (Nkind (Enc_I) = N_Package_Body
5086 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5089 -- The enclosing package may contain several instances. Rather
5090 -- than computing the earliest point at which to insert its
5091 -- freeze node, we place it at the end of the declarative part
5092 -- of the parent of the generic.
5094 Insert_After_Last_Decl
5095 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5098 Insert_After_Last_Decl (Inst_Node, F_Node);
5100 elsif Present (Enc_G)
5101 and then Present (Enc_I)
5102 and then Enc_G /= Enc_I
5103 and then Earlier (Inst_Node, Gen_Body)
5105 if Nkind (Enc_G) = N_Package_Body then
5106 E_G_Id := Corresponding_Spec (Enc_G);
5107 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5109 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5112 -- Freeze package that encloses instance, and place node after
5113 -- package that encloses generic. If enclosing package is already
5114 -- frozen we have to assume it is at the proper place. This may
5115 -- be a potential ABE that requires dynamic checking.
5117 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5119 -- Freeze enclosing subunit before instance
5121 Ensure_Freeze_Node (E_G_Id);
5123 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5124 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5127 Insert_After_Last_Decl (Inst_Node, F_Node);
5131 -- If none of the above, insert freeze node at the end of the
5132 -- current declarative part.
5134 Insert_After_Last_Decl (Inst_Node, F_Node);
5136 end Freeze_Subprogram_Body;
5142 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5144 return Generic_Renamings.Table (E).Gen_Id;
5147 ---------------------
5148 -- Get_Instance_Of --
5149 ---------------------
5151 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5152 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5154 if Res /= Assoc_Null then
5155 return Generic_Renamings.Table (Res).Act_Id;
5157 -- On exit, entity is not instantiated: not a generic parameter,
5158 -- or else parameter of an inner generic unit.
5162 end Get_Instance_Of;
5164 ------------------------------------
5165 -- Get_Package_Instantiation_Node --
5166 ------------------------------------
5168 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5169 Decl : Node_Id := Unit_Declaration_Node (A);
5173 -- If the instantiation is a compilation unit that does not need a
5174 -- body then the instantiation node has been rewritten as a package
5175 -- declaration for the instance, and we return the original node.
5177 -- If it is a compilation unit and the instance node has not been
5178 -- rewritten, then it is still the unit of the compilation. Finally,
5179 -- if a body is present, this is a parent of the main unit whose body
5180 -- has been compiled for inlining purposes, and the instantiation node
5181 -- has been rewritten with the instance body.
5183 -- Otherwise the instantiation node appears after the declaration.
5184 -- If the entity is a formal package, the declaration may have been
5185 -- rewritten as a generic declaration (in the case of a formal with a
5186 -- box) or left as a formal package declaration if it has actuals, and
5187 -- is found with a forward search.
5189 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5190 if Nkind (Decl) = N_Package_Declaration
5191 and then Present (Corresponding_Body (Decl))
5193 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5196 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5197 return Original_Node (Decl);
5199 return Unit (Parent (Decl));
5202 elsif Nkind (Decl) = N_Generic_Package_Declaration
5203 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5205 return Original_Node (Decl);
5208 Inst := Next (Decl);
5209 while Nkind (Inst) /= N_Package_Instantiation
5210 and then Nkind (Inst) /= N_Formal_Package_Declaration
5217 end Get_Package_Instantiation_Node;
5219 ------------------------
5220 -- Has_Been_Exchanged --
5221 ------------------------
5223 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5224 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5227 while Present (Next) loop
5228 if Full_View (Node (Next)) = E then
5236 end Has_Been_Exchanged;
5242 function Hash (F : Entity_Id) return HTable_Range is
5244 return HTable_Range (F mod HTable_Size);
5247 ------------------------
5248 -- Hide_Current_Scope --
5249 ------------------------
5251 procedure Hide_Current_Scope is
5252 C : constant Entity_Id := Current_Scope;
5256 Set_Is_Hidden_Open_Scope (C);
5257 E := First_Entity (C);
5259 while Present (E) loop
5260 if Is_Immediately_Visible (E) then
5261 Set_Is_Immediately_Visible (E, False);
5262 Append_Elmt (E, Hidden_Entities);
5268 -- Make the scope name invisible as well. This is necessary, but
5269 -- might conflict with calls to Rtsfind later on, in case the scope
5270 -- is a predefined one. There is no clean solution to this problem, so
5271 -- for now we depend on the user not redefining Standard itself in one
5272 -- of the parent units.
5274 if Is_Immediately_Visible (C)
5275 and then C /= Standard_Standard
5277 Set_Is_Immediately_Visible (C, False);
5278 Append_Elmt (C, Hidden_Entities);
5281 end Hide_Current_Scope;
5283 ------------------------------
5284 -- In_Same_Declarative_Part --
5285 ------------------------------
5287 function In_Same_Declarative_Part
5292 Decls : Node_Id := Parent (F_Node);
5293 Nod : Node_Id := Parent (Inst);
5296 while Present (Nod) loop
5300 elsif Nkind (Nod) = N_Subprogram_Body
5301 or else Nkind (Nod) = N_Package_Body
5302 or else Nkind (Nod) = N_Task_Body
5303 or else Nkind (Nod) = N_Protected_Body
5304 or else Nkind (Nod) = N_Block_Statement
5308 elsif Nkind (Nod) = N_Subunit then
5309 Nod := Corresponding_Stub (Nod);
5311 elsif Nkind (Nod) = N_Compilation_Unit then
5314 Nod := Parent (Nod);
5319 end In_Same_Declarative_Part;
5321 ---------------------
5322 -- Inherit_Context --
5323 ---------------------
5325 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5326 Current_Context : List_Id;
5327 Current_Unit : Node_Id;
5332 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5334 -- The inherited context is attached to the enclosing compilation
5335 -- unit. This is either the main unit, or the declaration for the
5336 -- main unit (in case the instantiation appears within the package
5337 -- declaration and the main unit is its body).
5339 Current_Unit := Parent (Inst);
5340 while Present (Current_Unit)
5341 and then Nkind (Current_Unit) /= N_Compilation_Unit
5343 Current_Unit := Parent (Current_Unit);
5346 Current_Context := Context_Items (Current_Unit);
5348 Item := First (Context_Items (Parent (Gen_Decl)));
5349 while Present (Item) loop
5350 if Nkind (Item) = N_With_Clause then
5351 New_I := New_Copy (Item);
5352 Set_Implicit_With (New_I, True);
5353 Append (New_I, Current_Context);
5359 end Inherit_Context;
5361 ----------------------------
5362 -- Insert_After_Last_Decl --
5363 ----------------------------
5365 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5366 L : List_Id := List_Containing (N);
5367 P : Node_Id := Parent (L);
5370 if not Is_List_Member (F_Node) then
5371 if Nkind (P) = N_Package_Specification
5372 and then L = Visible_Declarations (P)
5373 and then Present (Private_Declarations (P))
5374 and then not Is_Empty_List (Private_Declarations (P))
5376 L := Private_Declarations (P);
5379 Insert_After (Last (L), F_Node);
5381 end Insert_After_Last_Decl;
5387 procedure Install_Body
5388 (Act_Body : Node_Id;
5393 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5394 Act_Unit : constant Node_Id :=
5395 Unit (Cunit (Get_Source_Unit (N)));
5397 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5398 Gen_Unit : constant Node_Id :=
5399 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5400 Orig_Body : Node_Id := Gen_Body;
5401 Par : constant Entity_Id := Scope (Gen_Id);
5402 Body_Unit : Node_Id;
5404 Must_Delay : Boolean;
5406 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5407 -- Find subprogram (if any) that encloses instance and/or generic body.
5409 function True_Sloc (N : Node_Id) return Source_Ptr;
5410 -- If the instance is nested inside a generic unit, the Sloc of the
5411 -- instance indicates the place of the original definition, not the
5412 -- point of the current enclosing instance. Pending a better usage of
5413 -- Slocs to indicate instantiation places, we determine the place of
5414 -- origin of a node by finding the maximum sloc of any ancestor node.
5415 -- Why is this not equivalent fo Top_Level_Location ???
5417 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5418 Scop : Entity_Id := Scope (Id);
5421 while Scop /= Standard_Standard
5422 and then not Is_Overloadable (Scop)
5424 Scop := Scope (Scop);
5430 function True_Sloc (N : Node_Id) return Source_Ptr is
5437 while Present (N1) and then N1 /= Act_Unit loop
5438 if Sloc (N1) > Res then
5448 -- Start of processing for Install_Body
5451 -- If the body is a subunit, the freeze point is the corresponding
5452 -- stub in the current compilation, not the subunit itself.
5454 if Nkind (Parent (Gen_Body)) = N_Subunit then
5455 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5457 Orig_Body := Gen_Body;
5460 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5462 -- If the instantiation and the generic definition appear in the
5463 -- same package declaration, this is an early instantiation.
5464 -- If they appear in the same declarative part, it is an early
5465 -- instantiation only if the generic body appears textually later,
5466 -- and the generic body is also in the main unit.
5468 -- If instance is nested within a subprogram, and the generic body is
5469 -- not, the instance is delayed because the enclosing body is. If
5470 -- instance and body are within the same scope, or the same sub-
5471 -- program body, indicate explicitly that the instance is delayed.
5474 (Gen_Unit = Act_Unit
5475 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5476 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5477 or else (Gen_Unit = Body_Unit
5478 and then True_Sloc (N) < Sloc (Orig_Body)))
5479 and then Is_In_Main_Unit (Gen_Unit)
5480 and then (Scope (Act_Id) = Scope (Gen_Id)
5482 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5484 -- If this is an early instantiation, the freeze node is placed after
5485 -- the generic body. Otherwise, if the generic appears in an instance,
5486 -- we cannot freeze the current instance until the outer one is frozen.
5487 -- This is only relevant if the current instance is nested within some
5488 -- inner scope not itself within the outer instance. If this scope is
5489 -- a package body in the same declarative part as the outer instance,
5490 -- then that body needs to be frozen after the outer instance. Finally,
5491 -- if no delay is needed, we place the freeze node at the end of the
5492 -- current declarative part.
5494 if Expander_Active then
5495 Ensure_Freeze_Node (Act_Id);
5496 F_Node := Freeze_Node (Act_Id);
5499 Insert_After (Orig_Body, F_Node);
5501 elsif Is_Generic_Instance (Par)
5502 and then Present (Freeze_Node (Par))
5503 and then Scope (Act_Id) /= Par
5505 -- Freeze instance of inner generic after instance of enclosing
5508 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5509 Insert_After (Freeze_Node (Par), F_Node);
5511 -- Freeze package enclosing instance of inner generic after
5512 -- instance of enclosing generic.
5514 elsif Nkind (Parent (N)) = N_Package_Body
5515 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5519 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5522 Insert_After_Last_Decl (N, F_Node);
5523 Ensure_Freeze_Node (Enclosing);
5525 if not Is_List_Member (Freeze_Node (Enclosing)) then
5526 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5531 Insert_After_Last_Decl (N, F_Node);
5535 Insert_After_Last_Decl (N, F_Node);
5539 Set_Is_Frozen (Act_Id);
5540 Insert_Before (N, Act_Body);
5541 Mark_Rewrite_Insertion (Act_Body);
5544 --------------------
5545 -- Install_Parent --
5546 --------------------
5548 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5549 S : Entity_Id := Current_Scope;
5550 Inst_Par : Entity_Id;
5551 First_Par : Entity_Id;
5552 Inst_Node : Node_Id;
5553 Gen_Par : Entity_Id;
5554 First_Gen : Entity_Id;
5555 Ancestors : Elist_Id := New_Elmt_List;
5558 procedure Install_Formal_Packages (Par : Entity_Id);
5559 -- If any of the formals of the parent are formal packages with box,
5560 -- their formal parts are visible in the parent and thus in the child
5561 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5562 -- for the unit itself.
5564 procedure Install_Noninstance_Specs (Par : Entity_Id);
5565 -- Install the scopes of noninstance parent units ending with Par.
5567 procedure Install_Spec (Par : Entity_Id);
5568 -- The child unit is within the declarative part of the parent, so
5569 -- the declarations within the parent are immediately visible.
5571 -----------------------------
5572 -- Install_Formal_Packages --
5573 -----------------------------
5575 procedure Install_Formal_Packages (Par : Entity_Id) is
5579 E := First_Entity (Par);
5581 while Present (E) loop
5583 if Ekind (E) = E_Package
5584 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5586 -- If this is the renaming for the parent instance, done.
5588 if Renamed_Object (E) = Par then
5591 -- The visibility of a formal of an enclosing generic is
5594 elsif Denotes_Formal_Package (E) then
5597 elsif Present (Associated_Formal_Package (E))
5598 and then Box_Present (Parent (Associated_Formal_Package (E)))
5600 Check_Generic_Actuals (Renamed_Object (E), True);
5601 Set_Is_Hidden (E, False);
5607 end Install_Formal_Packages;
5609 -------------------------------
5610 -- Install_Noninstance_Specs --
5611 -------------------------------
5613 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5616 and then Par /= Standard_Standard
5617 and then not In_Open_Scopes (Par)
5619 Install_Noninstance_Specs (Scope (Par));
5622 end Install_Noninstance_Specs;
5628 procedure Install_Spec (Par : Entity_Id) is
5629 Spec : constant Node_Id :=
5630 Specification (Unit_Declaration_Node (Par));
5634 Set_Is_Immediately_Visible (Par);
5635 Install_Visible_Declarations (Par);
5636 Install_Private_Declarations (Par);
5637 Set_Use (Visible_Declarations (Spec));
5638 Set_Use (Private_Declarations (Spec));
5641 -- Start of processing for Install_Parent
5644 -- We need to install the parent instance to compile the instantiation
5645 -- of the child, but the child instance must appear in the current
5646 -- scope. Given that we cannot place the parent above the current
5647 -- scope in the scope stack, we duplicate the current scope and unstack
5648 -- both after the instantiation is complete.
5650 -- If the parent is itself the instantiation of a child unit, we must
5651 -- also stack the instantiation of its parent, and so on. Each such
5652 -- ancestor is the prefix of the name in a prior instantiation.
5654 -- If this is a nested instance, the parent unit itself resolves to
5655 -- a renaming of the parent instance, whose declaration we need.
5657 -- Finally, the parent may be a generic (not an instance) when the
5658 -- child unit appears as a formal package.
5662 if Present (Renamed_Entity (Inst_Par)) then
5663 Inst_Par := Renamed_Entity (Inst_Par);
5666 First_Par := Inst_Par;
5669 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5671 First_Gen := Gen_Par;
5673 while Present (Gen_Par)
5674 and then Is_Child_Unit (Gen_Par)
5676 -- Load grandparent instance as well.
5678 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5680 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5681 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5683 if Present (Renamed_Entity (Inst_Par)) then
5684 Inst_Par := Renamed_Entity (Inst_Par);
5689 (Specification (Unit_Declaration_Node (Inst_Par)));
5691 if Present (Gen_Par) then
5692 Prepend_Elmt (Inst_Par, Ancestors);
5695 -- Parent is not the name of an instantiation.
5697 Install_Noninstance_Specs (Inst_Par);
5709 if Present (First_Gen) then
5710 Append_Elmt (First_Par, Ancestors);
5713 Install_Noninstance_Specs (First_Par);
5716 if not Is_Empty_Elmt_List (Ancestors) then
5717 Elmt := First_Elmt (Ancestors);
5719 while Present (Elmt) loop
5720 Install_Spec (Node (Elmt));
5721 Install_Formal_Packages (Node (Elmt));
5732 --------------------------------
5733 -- Instantiate_Formal_Package --
5734 --------------------------------
5736 function Instantiate_Formal_Package
5739 Analyzed_Formal : Node_Id)
5742 Loc : constant Source_Ptr := Sloc (Actual);
5743 Actual_Pack : Entity_Id;
5744 Formal_Pack : Entity_Id;
5745 Gen_Parent : Entity_Id;
5748 Parent_Spec : Node_Id;
5750 function Formal_Entity
5752 Act_Ent : Entity_Id)
5754 -- Returns the entity associated with the given formal F. In the
5755 -- case where F is a formal package, this function will iterate
5756 -- through all of F's formals and enter map associations from the
5757 -- actuals occurring in the formal package's corresponding actual
5758 -- package (obtained via Act_Ent) to the formal package's formal
5759 -- parameters. This function is called recursively for arbitrary
5760 -- levels of formal packages.
5762 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5763 -- Within the generic part, entities in the formal package are
5764 -- visible. To validate subsequent type declarations, indicate
5765 -- the correspondence betwen the entities in the analyzed formal,
5766 -- and the entities in the actual package. There are three packages
5767 -- involved in the instantiation of a formal package: the parent
5768 -- generic P1 which appears in the generic declaration, the fake
5769 -- instantiation P2 which appears in the analyzed generic, and whose
5770 -- visible entities may be used in subsequent formals, and the actual
5771 -- P3 in the instance. To validate subsequent formals, me indicate
5772 -- that the entities in P2 are mapped into those of P3. The mapping of
5773 -- entities has to be done recursively for nested packages.
5779 function Formal_Entity
5781 Act_Ent : Entity_Id)
5784 Orig_Node : Node_Id := F;
5788 when N_Formal_Object_Declaration =>
5789 return Defining_Identifier (F);
5791 when N_Formal_Type_Declaration =>
5792 return Defining_Identifier (F);
5794 when N_Formal_Subprogram_Declaration =>
5795 return Defining_Unit_Name (Specification (F));
5797 when N_Formal_Package_Declaration |
5798 N_Generic_Package_Declaration =>
5800 if Nkind (F) = N_Generic_Package_Declaration then
5801 Orig_Node := Original_Node (F);
5805 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5806 Formal_Node : Node_Id;
5807 Formal_Ent : Entity_Id;
5809 Gen_Decl : Node_Id :=
5810 Unit_Declaration_Node
5811 (Entity (Name (Orig_Node)));
5812 Formals : List_Id :=
5813 Generic_Formal_Declarations (Gen_Decl);
5816 if Present (Formals) then
5817 Formal_Node := First_Non_Pragma (Formals);
5819 Formal_Node := Empty;
5822 -- As for the loop further below, this loop is making
5823 -- a probably invalid assumption about the correspondence
5824 -- between formals and actuals and eventually needs to
5825 -- corrected to account for cases where the formals are
5826 -- not synchronized and in one-to-one correspondence
5827 -- with actuals. ???
5829 -- What is certain is that for a legal program the
5830 -- presence of actual entities guarantees the existing
5833 while Present (Actual_Ent)
5834 and then Present (Formal_Node)
5835 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5837 -- ??? Are the following calls also needed here:
5839 -- Set_Is_Hidden (Actual_Ent, False);
5840 -- Set_Is_Potentially_Use_Visible
5841 -- (Actual_Ent, In_Use (Act_Ent));
5843 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5844 if Present (Formal_Ent) then
5845 Set_Instance_Of (Formal_Ent, Actual_Ent);
5847 Next_Non_Pragma (Formal_Node);
5849 Next_Entity (Actual_Ent);
5853 return Defining_Identifier (Orig_Node);
5855 when N_Use_Package_Clause =>
5858 when N_Use_Type_Clause =>
5861 -- We return Empty for all other encountered forms of
5862 -- declarations because there are some cases of nonformal
5863 -- sorts of declaration that can show up (e.g., when array
5864 -- formals are present). Since it's not clear what kinds
5865 -- can appear among the formals, we won't raise failure here.
5877 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5882 Set_Instance_Of (Form, Act);
5884 E1 := First_Entity (Form);
5885 E2 := First_Entity (Act);
5887 and then E1 /= First_Private_Entity (Form)
5889 if not Is_Internal (E1)
5890 and then not Is_Class_Wide_Type (E1)
5894 and then Chars (E2) /= Chars (E1)
5902 Set_Instance_Of (E1, E2);
5905 and then Is_Tagged_Type (E2)
5908 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5911 if Ekind (E1) = E_Package
5912 and then No (Renamed_Object (E1))
5914 Map_Entities (E1, E2);
5923 -- Start of processing for Instantiate_Formal_Package
5928 if not Is_Entity_Name (Actual)
5929 or else Ekind (Entity (Actual)) /= E_Package
5932 ("expect package instance to instantiate formal", Actual);
5933 Abandon_Instantiation (Actual);
5934 raise Program_Error;
5937 Actual_Pack := Entity (Actual);
5938 Set_Is_Instantiated (Actual_Pack);
5940 -- The actual may be a renamed package, or an outer generic
5941 -- formal package whose instantiation is converted into a renaming.
5943 if Present (Renamed_Object (Actual_Pack)) then
5944 Actual_Pack := Renamed_Object (Actual_Pack);
5947 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5948 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5949 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5952 Generic_Parent (Specification (Analyzed_Formal));
5954 Defining_Unit_Name (Specification (Analyzed_Formal));
5957 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5958 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5960 Parent_Spec := Parent (Actual_Pack);
5963 if Gen_Parent = Any_Id then
5965 ("previous error in declaration of formal package", Actual);
5966 Abandon_Instantiation (Actual);
5969 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5972 ("actual parameter must be instance of&", Actual, Gen_Parent);
5973 Abandon_Instantiation (Actual);
5976 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5977 Map_Entities (Formal_Pack, Actual_Pack);
5980 Make_Package_Renaming_Declaration (Loc,
5981 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5982 Name => New_Reference_To (Actual_Pack, Loc));
5984 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5985 Defining_Identifier (Formal));
5986 Decls := New_List (Nod);
5988 -- If the formal F has a box, then the generic declarations are
5989 -- visible in the generic G. In an instance of G, the corresponding
5990 -- entities in the actual for F (which are the actuals for the
5991 -- instantiation of the generic that F denotes) must also be made
5992 -- visible for analysis of the current instance. On exit from the
5993 -- current instance, those entities are made private again. If the
5994 -- actual is currently in use, these entities are also use-visible.
5996 -- The loop through the actual entities also steps through the
5997 -- formal entities and enters associations from formals to
5998 -- actuals into the renaming map. This is necessary to properly
5999 -- handle checking of actual parameter associations for later
6000 -- formals that depend on actuals declared in the formal package.
6002 -- This processing needs to be reviewed at some point because
6003 -- it is probably not entirely correct as written. For example
6004 -- there may not be a strict one-to-one correspondence between
6005 -- actuals and formals and this loop is currently assuming that
6008 if Box_Present (Formal) then
6010 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
6011 Formal_Node : Node_Id := Empty;
6012 Formal_Ent : Entity_Id;
6013 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
6014 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
6017 if Present (Formals) then
6018 Formal_Node := First_Non_Pragma (Formals);
6021 while Present (Actual_Ent)
6022 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6024 Set_Is_Hidden (Actual_Ent, False);
6025 Set_Is_Potentially_Use_Visible
6026 (Actual_Ent, In_Use (Actual_Pack));
6028 if Present (Formal_Node) then
6029 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6031 if Present (Formal_Ent) then
6032 Set_Instance_Of (Formal_Ent, Actual_Ent);
6035 Next_Non_Pragma (Formal_Node);
6038 Next_Entity (Actual_Ent);
6042 -- If the formal is not declared with a box, reanalyze it as
6043 -- an instantiation, to verify the matching rules of 12.7. The
6044 -- actual checks are performed after the generic associations
6049 I_Pack : constant Entity_Id :=
6050 Make_Defining_Identifier (Sloc (Actual),
6051 Chars => New_Internal_Name ('P'));
6054 Set_Is_Internal (I_Pack);
6057 Make_Package_Instantiation (Sloc (Actual),
6058 Defining_Unit_Name => I_Pack,
6059 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6060 Generic_Associations =>
6061 Generic_Associations (Formal)));
6068 end Instantiate_Formal_Package;
6070 -----------------------------------
6071 -- Instantiate_Formal_Subprogram --
6072 -----------------------------------
6074 function Instantiate_Formal_Subprogram
6077 Analyzed_Formal : Node_Id)
6080 Loc : Source_Ptr := Sloc (Instantiation_Node);
6081 Formal_Sub : constant Entity_Id :=
6082 Defining_Unit_Name (Specification (Formal));
6083 Analyzed_S : constant Entity_Id :=
6084 Defining_Unit_Name (Specification (Analyzed_Formal));
6085 Decl_Node : Node_Id;
6089 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6090 -- If the generic is a child unit, the parent has been installed
6091 -- on the scope stack, but a default subprogram cannot resolve to
6092 -- something on the parent because that parent is not really part
6093 -- of the visible context (it is there to resolve explicit local
6094 -- entities). If the default has resolved in this way, we remove
6095 -- the entity from immediate visibility and analyze the node again
6096 -- to emit an error message or find another visible candidate.
6098 procedure Valid_Actual_Subprogram (Act : Node_Id);
6099 -- Perform legality check and raise exception on failure.
6101 -----------------------
6102 -- From_Parent_Scope --
6103 -----------------------
6105 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6106 Gen_Scope : Node_Id := Scope (Analyzed_S);
6109 while Present (Gen_Scope)
6110 and then Is_Child_Unit (Gen_Scope)
6112 if Scope (Subp) = Scope (Gen_Scope) then
6116 Gen_Scope := Scope (Gen_Scope);
6120 end From_Parent_Scope;
6122 -----------------------------
6123 -- Valid_Actual_Subprogram --
6124 -----------------------------
6126 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6128 if not Is_Entity_Name (Act)
6129 and then Nkind (Act) /= N_Operator_Symbol
6130 and then Nkind (Act) /= N_Attribute_Reference
6131 and then Nkind (Act) /= N_Selected_Component
6132 and then Nkind (Act) /= N_Indexed_Component
6133 and then Nkind (Act) /= N_Character_Literal
6134 and then Nkind (Act) /= N_Explicit_Dereference
6136 if Etype (Act) /= Any_Type then
6138 ("Expect subprogram name to instantiate &",
6139 Instantiation_Node, Formal_Sub);
6142 -- In any case, instantiation cannot continue.
6144 Abandon_Instantiation (Instantiation_Node);
6146 end Valid_Actual_Subprogram;
6148 -- Start of processing for Instantiate_Formal_Subprogram
6151 New_Spec := New_Copy_Tree (Specification (Formal));
6153 -- Create new entity for the actual (New_Copy_Tree does not).
6155 Set_Defining_Unit_Name
6156 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6158 -- Find entity of actual. If the actual is an attribute reference, it
6159 -- cannot be resolved here (its formal is missing) but is handled
6160 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6161 -- fully resolved subsequently, when the renaming declaration for the
6162 -- formal is analyzed. If it is an explicit dereference, resolve the
6163 -- prefix but not the actual itself, to prevent interpretation as a
6166 if Present (Actual) then
6167 Loc := Sloc (Actual);
6168 Set_Sloc (New_Spec, Loc);
6170 if Nkind (Actual) = N_Operator_Symbol then
6171 Find_Direct_Name (Actual);
6173 elsif Nkind (Actual) = N_Explicit_Dereference then
6174 Analyze (Prefix (Actual));
6176 elsif Nkind (Actual) /= N_Attribute_Reference then
6180 Valid_Actual_Subprogram (Actual);
6183 elsif Present (Default_Name (Formal)) then
6185 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6186 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6187 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6188 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6189 and then Present (Entity (Default_Name (Formal)))
6191 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6193 Nam := New_Copy (Default_Name (Formal));
6194 Set_Sloc (Nam, Loc);
6197 elsif Box_Present (Formal) then
6199 -- Actual is resolved at the point of instantiation. Create
6200 -- an identifier or operator with the same name as the formal.
6202 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6203 Nam := Make_Operator_Symbol (Loc,
6204 Chars => Chars (Formal_Sub),
6205 Strval => No_String);
6207 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6212 ("missing actual for instantiation of &",
6213 Instantiation_Node, Formal_Sub);
6214 Abandon_Instantiation (Instantiation_Node);
6218 Make_Subprogram_Renaming_Declaration (Loc,
6219 Specification => New_Spec,
6222 -- Gather possible interpretations for the actual before analyzing the
6223 -- instance. If overloaded, it will be resolved when analyzing the
6224 -- renaming declaration.
6226 if Box_Present (Formal)
6227 and then No (Actual)
6231 if Is_Child_Unit (Scope (Analyzed_S))
6232 and then Present (Entity (Nam))
6234 if not Is_Overloaded (Nam) then
6236 if From_Parent_Scope (Entity (Nam)) then
6237 Set_Is_Immediately_Visible (Entity (Nam), False);
6238 Set_Entity (Nam, Empty);
6239 Set_Etype (Nam, Empty);
6243 Set_Is_Immediately_Visible (Entity (Nam));
6252 Get_First_Interp (Nam, I, It);
6254 while Present (It.Nam) loop
6255 if From_Parent_Scope (It.Nam) then
6259 Get_Next_Interp (I, It);
6266 -- The generic instantiation freezes the actual. This can only be
6267 -- done once the actual is resolved, in the analysis of the renaming
6268 -- declaration. To indicate that must be done, we set the corresponding
6269 -- spec of the node to point to the formal subprogram declaration.
6271 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6273 -- We cannot analyze the renaming declaration, and thus find the
6274 -- actual, until the all the actuals are assembled in the instance.
6275 -- For subsequent checks of other actuals, indicate the node that
6276 -- will hold the instance of this formal.
6278 Set_Instance_Of (Analyzed_S, Nam);
6280 if Nkind (Actual) = N_Selected_Component
6281 and then Is_Task_Type (Etype (Prefix (Actual)))
6282 and then not Is_Frozen (Etype (Prefix (Actual)))
6284 -- The renaming declaration will create a body, which must appear
6285 -- outside of the instantiation, We move the renaming declaration
6286 -- out of the instance, and create an additional renaming inside,
6287 -- to prevent freezing anomalies.
6290 Anon_Id : constant Entity_Id :=
6291 Make_Defining_Identifier
6292 (Loc, New_Internal_Name ('E'));
6294 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6295 Insert_Before (Instantiation_Node, Decl_Node);
6296 Analyze (Decl_Node);
6298 -- Now create renaming within the instance.
6301 Make_Subprogram_Renaming_Declaration (Loc,
6302 Specification => New_Copy_Tree (New_Spec),
6303 Name => New_Occurrence_Of (Anon_Id, Loc));
6305 Set_Defining_Unit_Name (Specification (Decl_Node),
6306 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6311 end Instantiate_Formal_Subprogram;
6313 ------------------------
6314 -- Instantiate_Object --
6315 ------------------------
6317 function Instantiate_Object
6320 Analyzed_Formal : Node_Id)
6323 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6324 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6325 Loc : constant Source_Ptr := Sloc (Actual);
6326 Act_Assoc : constant Node_Id := Parent (Actual);
6327 Orig_Ftyp : constant Entity_Id :=
6328 Etype (Defining_Identifier (Analyzed_Formal));
6330 Decl_Node : Node_Id;
6331 Subt_Decl : Node_Id := Empty;
6332 List : List_Id := New_List;
6335 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6336 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6339 Set_Parent (List, Parent (Actual));
6343 if Out_Present (Formal) then
6345 -- An IN OUT generic actual must be a name. The instantiation is
6346 -- a renaming declaration. The actual is the name being renamed.
6347 -- We use the actual directly, rather than a copy, because it is not
6348 -- used further in the list of actuals, and because a copy or a use
6349 -- of relocate_node is incorrect if the instance is nested within
6350 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6351 -- field links the declaration to the generic association.
6355 ("missing actual for instantiation of &",
6356 Instantiation_Node, Formal_Id);
6357 Abandon_Instantiation (Instantiation_Node);
6361 Make_Object_Renaming_Declaration (Loc,
6362 Defining_Identifier => New_Copy (Formal_Id),
6363 Subtype_Mark => New_Copy_Tree (Type_Id),
6366 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6368 -- The analysis of the actual may produce insert_action nodes, so
6369 -- the declaration must have a context in which to attach them.
6371 Append (Decl_Node, List);
6374 -- This check is performed here because Analyze_Object_Renaming
6375 -- will not check it when Comes_From_Source is False. Note
6376 -- though that the check for the actual being the name of an
6377 -- object will be performed in Analyze_Object_Renaming.
6379 if Is_Object_Reference (Actual)
6380 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6383 ("illegal discriminant-dependent component for in out parameter",
6387 -- The actual has to be resolved in order to check that it is
6388 -- a variable (due to cases such as F(1), where F returns
6389 -- access to an array, and for overloaded prefixes).
6392 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6394 if Is_Private_Type (Ftyp)
6395 and then not Is_Private_Type (Etype (Actual))
6396 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6397 or else Base_Type (Etype (Actual)) = Ftyp)
6399 -- If the actual has the type of the full view of the formal,
6400 -- or else a non-private subtype of the formal, then
6401 -- the visibility of the formal type has changed. Add to the
6402 -- actuals a subtype declaration that will force the exchange
6403 -- of views in the body of the instance as well.
6406 Make_Subtype_Declaration (Loc,
6407 Defining_Identifier =>
6408 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6409 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6411 Prepend (Subt_Decl, List);
6413 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6414 Exchange_Declarations (Ftyp);
6417 Resolve (Actual, Ftyp);
6419 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6421 ("actual for& must be a variable", Actual, Formal_Id);
6423 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6425 "type of actual does not match type of&", Actual, Formal_Id);
6429 Note_Possible_Modification (Actual);
6431 -- Check for instantiation of atomic/volatile actual for
6432 -- non-atomic/volatile formal (RM C.6 (12)).
6434 if Is_Atomic_Object (Actual)
6435 and then not Is_Atomic (Orig_Ftyp)
6438 ("cannot instantiate non-atomic formal object " &
6439 "with atomic actual", Actual);
6441 elsif Is_Volatile_Object (Actual)
6442 and then not Is_Volatile (Orig_Ftyp)
6445 ("cannot instantiate non-volatile formal object " &
6446 "with volatile actual", Actual);
6452 -- The instantiation of a generic formal in-parameter
6453 -- is a constant declaration. The actual is the expression for
6454 -- that declaration.
6456 if Present (Actual) then
6458 Decl_Node := Make_Object_Declaration (Loc,
6459 Defining_Identifier => New_Copy (Formal_Id),
6460 Constant_Present => True,
6461 Object_Definition => New_Copy_Tree (Type_Id),
6462 Expression => Actual);
6464 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6466 -- A generic formal object of a tagged type is defined
6467 -- to be aliased so the new constant must also be treated
6471 (Etype (Defining_Identifier (Analyzed_Formal)))
6473 Set_Aliased_Present (Decl_Node);
6476 Append (Decl_Node, List);
6482 (Etype (Defining_Identifier (Analyzed_Formal)));
6484 Freeze_Before (Instantiation_Node, Typ);
6486 -- If the actual is an aggregate, perform name resolution
6487 -- on its components (the analysis of an aggregate does not
6488 -- do it) to capture local names that may be hidden if the
6489 -- generic is a child unit.
6491 if Nkind (Actual) = N_Aggregate then
6492 Pre_Analyze_And_Resolve (Actual, Typ);
6496 elsif Present (Expression (Formal)) then
6498 -- Use default to construct declaration.
6501 Make_Object_Declaration (Sloc (Formal),
6502 Defining_Identifier => New_Copy (Formal_Id),
6503 Constant_Present => True,
6504 Object_Definition => New_Copy (Type_Id),
6505 Expression => New_Copy_Tree (Expression (Formal)));
6507 Append (Decl_Node, List);
6508 Set_Analyzed (Expression (Decl_Node), False);
6512 ("missing actual for instantiation of &",
6513 Instantiation_Node, Formal_Id);
6514 Abandon_Instantiation (Instantiation_Node);
6520 end Instantiate_Object;
6522 ------------------------------
6523 -- Instantiate_Package_Body --
6524 ------------------------------
6526 procedure Instantiate_Package_Body
6527 (Body_Info : Pending_Body_Info)
6529 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6530 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6531 Loc : constant Source_Ptr := Sloc (Inst_Node);
6533 Gen_Id : constant Node_Id := Name (Inst_Node);
6534 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6535 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6536 Act_Spec : constant Node_Id := Specification (Act_Decl);
6537 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6539 Act_Body_Name : Node_Id;
6541 Gen_Body_Id : Node_Id;
6543 Act_Body_Id : Entity_Id;
6545 Parent_Installed : Boolean := False;
6546 Save_Style_Check : Boolean := Style_Check;
6549 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6551 -- The instance body may already have been processed, as the parent
6552 -- of another instance that is inlined. (Load_Parent_Of_Generic).
6554 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
6558 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6560 if No (Gen_Body_Id) then
6561 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6562 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6565 -- Establish global variable for sloc adjustment and for error
6568 Instantiation_Node := Inst_Node;
6570 if Present (Gen_Body_Id) then
6571 Save_Env (Gen_Unit, Act_Decl_Id);
6572 Style_Check := False;
6573 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6575 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6577 Create_Instantiation_Source
6578 (Inst_Node, Gen_Body_Id, S_Adjustment);
6582 (Original_Node (Gen_Body), Empty, Instantiating => True);
6584 -- Build new name (possibly qualified) for body declaration.
6586 Act_Body_Id := New_Copy (Act_Decl_Id);
6588 -- Some attributes of the spec entity are not inherited by the
6591 Set_Handler_Records (Act_Body_Id, No_List);
6593 if Nkind (Defining_Unit_Name (Act_Spec)) =
6594 N_Defining_Program_Unit_Name
6597 Make_Defining_Program_Unit_Name (Loc,
6598 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6599 Defining_Identifier => Act_Body_Id);
6601 Act_Body_Name := Act_Body_Id;
6604 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6606 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6607 Check_Generic_Actuals (Act_Decl_Id, False);
6609 -- If it is a child unit, make the parent instance (which is an
6610 -- instance of the parent of the generic) visible. The parent
6611 -- instance is the prefix of the name of the generic unit.
6613 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6614 and then Nkind (Gen_Id) = N_Expanded_Name
6616 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6617 Parent_Installed := True;
6619 elsif Is_Child_Unit (Gen_Unit) then
6620 Install_Parent (Scope (Gen_Unit), In_Body => True);
6621 Parent_Installed := True;
6624 -- If the instantiation is a library unit, and this is the main
6625 -- unit, then build the resulting compilation unit nodes for the
6626 -- instance. If this is a compilation unit but it is not the main
6627 -- unit, then it is the body of a unit in the context, that is being
6628 -- compiled because it is encloses some inlined unit or another
6629 -- generic unit being instantiated. In that case, this body is not
6630 -- part of the current compilation, and is not attached to the tree,
6631 -- but its parent must be set for analysis.
6633 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6635 -- Replace instance node with body of instance, and create
6636 -- new node for corresponding instance declaration.
6638 Build_Instance_Compilation_Unit_Nodes
6639 (Inst_Node, Act_Body, Act_Decl);
6640 Analyze (Inst_Node);
6642 if Parent (Inst_Node) = Cunit (Main_Unit) then
6644 -- If the instance is a child unit itself, then set the
6645 -- scope of the expanded body to be the parent of the
6646 -- instantiation (ensuring that the fully qualified name
6647 -- will be generated for the elaboration subprogram).
6649 if Nkind (Defining_Unit_Name (Act_Spec)) =
6650 N_Defining_Program_Unit_Name
6653 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6657 -- Case where instantiation is not a library unit
6660 -- If this is an early instantiation, i.e. appears textually
6661 -- before the corresponding body and must be elaborated first,
6662 -- indicate that the body instance is to be delayed.
6664 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6666 -- Now analyze the body. We turn off all checks if this is
6667 -- an internal unit, since there is no reason to have checks
6668 -- on for any predefined run-time library code. All such
6669 -- code is designed to be compiled with checks off.
6671 -- Note that we do NOT apply this criterion to children of
6672 -- GNAT (or on VMS, children of DEC). The latter units must
6673 -- suppress checks explicitly if this is needed.
6675 if Is_Predefined_File_Name
6676 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6678 Analyze (Act_Body, Suppress => All_Checks);
6684 if not Generic_Separately_Compiled (Gen_Unit) then
6685 Inherit_Context (Gen_Body, Inst_Node);
6688 -- Remove the parent instances if they have been placed on the
6689 -- scope stack to compile the body.
6691 if Parent_Installed then
6692 Remove_Parent (In_Body => True);
6695 Restore_Private_Views (Act_Decl_Id);
6697 Style_Check := Save_Style_Check;
6699 -- If we have no body, and the unit requires a body, then complain.
6700 -- This complaint is suppressed if we have detected other errors
6701 -- (since a common reason for missing the body is that it had errors).
6703 elsif Unit_Requires_Body (Gen_Unit) then
6704 if Serious_Errors_Detected = 0 then
6706 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6708 -- Don't attempt to perform any cleanup actions if some other
6709 -- error was aready detected, since this can cause blowups.
6715 -- Case of package that does not need a body
6718 -- If the instantiation of the declaration is a library unit,
6719 -- rewrite the original package instantiation as a package
6720 -- declaration in the compilation unit node.
6722 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6723 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6724 Rewrite (Inst_Node, Act_Decl);
6726 -- If the instantiation is not a library unit, then append the
6727 -- declaration to the list of implicitly generated entities.
6728 -- unless it is already a list member which means that it was
6729 -- already processed
6731 elsif not Is_List_Member (Act_Decl) then
6732 Mark_Rewrite_Insertion (Act_Decl);
6733 Insert_Before (Inst_Node, Act_Decl);
6737 Expander_Mode_Restore;
6738 end Instantiate_Package_Body;
6740 ---------------------------------
6741 -- Instantiate_Subprogram_Body --
6742 ---------------------------------
6744 procedure Instantiate_Subprogram_Body
6745 (Body_Info : Pending_Body_Info)
6747 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6748 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6749 Loc : constant Source_Ptr := Sloc (Inst_Node);
6752 Gen_Id : constant Node_Id := Name (Inst_Node);
6753 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
6754 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6755 Anon_Id : constant Entity_Id :=
6756 Defining_Unit_Name (Specification (Act_Decl));
6758 Gen_Body_Id : Node_Id;
6760 Act_Body_Id : Entity_Id;
6761 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6762 Pack_Body : Node_Id;
6763 Prev_Formal : Entity_Id;
6764 Unit_Renaming : Node_Id;
6766 Parent_Installed : Boolean := False;
6767 Save_Style_Check : Boolean := Style_Check;
6770 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6772 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6774 if No (Gen_Body_Id) then
6775 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6776 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6779 Instantiation_Node := Inst_Node;
6781 if Present (Gen_Body_Id) then
6782 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6784 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6786 -- Either body is not present, or context is non-expanding, as
6787 -- when compiling a subunit. Mark the instance as completed.
6789 Set_Has_Completion (Anon_Id);
6793 Save_Env (Gen_Unit, Anon_Id);
6794 Style_Check := False;
6795 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6796 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6800 (Original_Node (Gen_Body), Empty, Instantiating => True);
6801 Act_Body_Id := Defining_Entity (Act_Body);
6802 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6803 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6804 Set_Corresponding_Spec (Act_Body, Anon_Id);
6805 Set_Has_Completion (Anon_Id);
6806 Check_Generic_Actuals (Pack_Id, False);
6808 -- If it is a child unit, make the parent instance (which is an
6809 -- instance of the parent of the generic) visible. The parent
6810 -- instance is the prefix of the name of the generic unit.
6812 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6813 and then Nkind (Gen_Id) = N_Expanded_Name
6815 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6816 Parent_Installed := True;
6818 elsif Is_Child_Unit (Gen_Unit) then
6819 Install_Parent (Scope (Gen_Unit), In_Body => True);
6820 Parent_Installed := True;
6823 -- Inside its body, a reference to the generic unit is a reference
6824 -- to the instance. The corresponding renaming is the first
6825 -- declaration in the body.
6828 Make_Subprogram_Renaming_Declaration (Loc,
6831 Specification (Original_Node (Gen_Body)),
6833 Instantiating => True),
6834 Name => New_Occurrence_Of (Anon_Id, Loc));
6836 -- If there is a formal subprogram with the same name as the
6837 -- unit itself, do not add this renaming declaration. This is
6838 -- a temporary fix for one ACVC test. ???
6840 Prev_Formal := First_Entity (Pack_Id);
6841 while Present (Prev_Formal) loop
6842 if Chars (Prev_Formal) = Chars (Gen_Unit)
6843 and then Is_Overloadable (Prev_Formal)
6848 Next_Entity (Prev_Formal);
6851 if Present (Prev_Formal) then
6852 Decls := New_List (Act_Body);
6854 Decls := New_List (Unit_Renaming, Act_Body);
6857 -- The subprogram body is placed in the body of a dummy package
6858 -- body, whose spec contains the subprogram declaration as well
6859 -- as the renaming declarations for the generic parameters.
6861 Pack_Body := Make_Package_Body (Loc,
6862 Defining_Unit_Name => New_Copy (Pack_Id),
6863 Declarations => Decls);
6865 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6867 -- If the instantiation is a library unit, then build resulting
6868 -- compilation unit nodes for the instance. The declaration of
6869 -- the enclosing package is the grandparent of the subprogram
6870 -- declaration. First replace the instantiation node as the unit
6871 -- of the corresponding compilation.
6873 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6875 if Parent (Inst_Node) = Cunit (Main_Unit) then
6876 Set_Unit (Parent (Inst_Node), Inst_Node);
6877 Build_Instance_Compilation_Unit_Nodes
6878 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6879 Analyze (Inst_Node);
6881 Set_Parent (Pack_Body, Parent (Inst_Node));
6882 Analyze (Pack_Body);
6886 Insert_Before (Inst_Node, Pack_Body);
6887 Mark_Rewrite_Insertion (Pack_Body);
6888 Analyze (Pack_Body);
6890 if Expander_Active then
6891 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6895 if not Generic_Separately_Compiled (Gen_Unit) then
6896 Inherit_Context (Gen_Body, Inst_Node);
6899 Restore_Private_Views (Pack_Id, False);
6901 if Parent_Installed then
6902 Remove_Parent (In_Body => True);
6906 Style_Check := Save_Style_Check;
6908 -- Body not found. Error was emitted already. If there were no
6909 -- previous errors, this may be an instance whose scope is a premature
6910 -- instance. In that case we must insure that the (legal) program does
6911 -- raise program error if executed. We generate a subprogram body for
6912 -- this purpose. See DEC ac30vso.
6914 elsif Serious_Errors_Detected = 0
6915 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6917 if Ekind (Anon_Id) = E_Procedure then
6919 Make_Subprogram_Body (Loc,
6921 Make_Procedure_Specification (Loc,
6922 Defining_Unit_Name => New_Copy (Anon_Id),
6923 Parameter_Specifications =>
6925 (Parameter_Specifications (Parent (Anon_Id)))),
6927 Declarations => Empty_List,
6928 Handled_Statement_Sequence =>
6929 Make_Handled_Sequence_Of_Statements (Loc,
6932 Make_Raise_Program_Error (Loc,
6934 PE_Access_Before_Elaboration))));
6938 Make_Subprogram_Body (Loc,
6940 Make_Function_Specification (Loc,
6941 Defining_Unit_Name => New_Copy (Anon_Id),
6942 Parameter_Specifications =>
6944 (Parameter_Specifications (Parent (Anon_Id))),
6946 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6948 Declarations => Empty_List,
6949 Handled_Statement_Sequence =>
6950 Make_Handled_Sequence_Of_Statements (Loc,
6951 Statements => New_List (
6952 Make_Return_Statement (Loc,
6954 Make_Raise_Program_Error (Loc,
6956 PE_Access_Before_Elaboration)))));
6959 Pack_Body := Make_Package_Body (Loc,
6960 Defining_Unit_Name => New_Copy (Pack_Id),
6961 Declarations => New_List (Act_Body));
6963 Insert_After (Inst_Node, Pack_Body);
6964 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6965 Analyze (Pack_Body);
6968 Expander_Mode_Restore;
6969 end Instantiate_Subprogram_Body;
6971 ----------------------
6972 -- Instantiate_Type --
6973 ----------------------
6975 function Instantiate_Type
6978 Analyzed_Formal : Node_Id)
6981 Loc : constant Source_Ptr := Sloc (Actual);
6982 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6983 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6984 Ancestor : Entity_Id;
6985 Def : constant Node_Id := Formal_Type_Definition (Formal);
6987 Decl_Node : Node_Id;
6989 procedure Validate_Array_Type_Instance;
6990 procedure Validate_Access_Subprogram_Instance;
6991 procedure Validate_Access_Type_Instance;
6992 procedure Validate_Derived_Type_Instance;
6993 procedure Validate_Private_Type_Instance;
6994 -- These procedures perform validation tests for the named case
6996 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6997 -- Check that base types are the same and that the subtypes match
6998 -- statically. Used in several of the above.
7000 --------------------
7001 -- Subtypes_Match --
7002 --------------------
7004 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7005 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7008 return (Base_Type (T) = Base_Type (Act_T)
7009 -- why is the and then commented out here???
7010 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7011 and then Subtypes_Statically_Match (T, Act_T))
7013 or else (Is_Class_Wide_Type (Gen_T)
7014 and then Is_Class_Wide_Type (Act_T)
7017 Get_Instance_Of (Root_Type (Gen_T)),
7018 Root_Type (Act_T)));
7021 -----------------------------------------
7022 -- Validate_Access_Subprogram_Instance --
7023 -----------------------------------------
7025 procedure Validate_Access_Subprogram_Instance is
7027 if not Is_Access_Type (Act_T)
7028 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7031 ("expect access type in instantiation of &", Actual, Gen_T);
7032 Abandon_Instantiation (Actual);
7035 Check_Mode_Conformant
7036 (Designated_Type (Act_T),
7037 Designated_Type (A_Gen_T),
7041 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7042 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7044 ("protected access type not allowed for formal &",
7048 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7050 ("expect protected access type for formal &",
7053 end Validate_Access_Subprogram_Instance;
7055 -----------------------------------
7056 -- Validate_Access_Type_Instance --
7057 -----------------------------------
7059 procedure Validate_Access_Type_Instance is
7060 Desig_Type : Entity_Id :=
7061 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7064 if not Is_Access_Type (Act_T) then
7066 ("expect access type in instantiation of &", Actual, Gen_T);
7067 Abandon_Instantiation (Actual);
7070 if Is_Access_Constant (A_Gen_T) then
7071 if not Is_Access_Constant (Act_T) then
7073 ("actual type must be access-to-constant type", Actual);
7074 Abandon_Instantiation (Actual);
7077 if Is_Access_Constant (Act_T) then
7079 ("actual type must be access-to-variable type", Actual);
7080 Abandon_Instantiation (Actual);
7082 elsif Ekind (A_Gen_T) = E_General_Access_Type
7083 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7085 Error_Msg_N ("actual must be general access type!", Actual);
7086 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7087 Abandon_Instantiation (Actual);
7091 -- The designated subtypes, that is to say the subtypes introduced
7092 -- by an access type declaration (and not by a subtype declaration)
7095 if not Subtypes_Match
7096 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7099 ("designated type of actual does not match that of formal &",
7101 Abandon_Instantiation (Actual);
7103 elsif Is_Access_Type (Designated_Type (Act_T))
7104 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7106 Is_Constrained (Designated_Type (Desig_Type))
7109 ("designated type of actual does not match that of formal &",
7111 Abandon_Instantiation (Actual);
7113 end Validate_Access_Type_Instance;
7115 ----------------------------------
7116 -- Validate_Array_Type_Instance --
7117 ----------------------------------
7119 procedure Validate_Array_Type_Instance is
7124 function Formal_Dimensions return Int;
7125 -- Count number of dimensions in array type formal
7127 function Formal_Dimensions return Int is
7132 if Nkind (Def) = N_Constrained_Array_Definition then
7133 Index := First (Discrete_Subtype_Definitions (Def));
7135 Index := First (Subtype_Marks (Def));
7138 while Present (Index) loop
7144 end Formal_Dimensions;
7146 -- Start of processing for Validate_Array_Type_Instance
7149 if not Is_Array_Type (Act_T) then
7151 ("expect array type in instantiation of &", Actual, Gen_T);
7152 Abandon_Instantiation (Actual);
7154 elsif Nkind (Def) = N_Constrained_Array_Definition then
7155 if not (Is_Constrained (Act_T)) then
7157 ("expect constrained array in instantiation of &",
7159 Abandon_Instantiation (Actual);
7163 if Is_Constrained (Act_T) then
7165 ("expect unconstrained array in instantiation of &",
7167 Abandon_Instantiation (Actual);
7171 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7173 ("dimensions of actual do not match formal &", Actual, Gen_T);
7174 Abandon_Instantiation (Actual);
7177 I1 := First_Index (A_Gen_T);
7178 I2 := First_Index (Act_T);
7179 for J in 1 .. Formal_Dimensions loop
7181 -- If the indices of the actual were given by a subtype_mark,
7182 -- the index was transformed into a range attribute. Retrieve
7183 -- the original type mark for checking.
7185 if Is_Entity_Name (Original_Node (I2)) then
7186 T2 := Entity (Original_Node (I2));
7191 if not Subtypes_Match
7192 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7195 ("index types of actual do not match those of formal &",
7197 Abandon_Instantiation (Actual);
7204 if not Subtypes_Match (
7205 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7206 Component_Type (Act_T))
7209 ("component subtype of actual does not match that of formal &",
7211 Abandon_Instantiation (Actual);
7214 if Has_Aliased_Components (A_Gen_T)
7215 and then not Has_Aliased_Components (Act_T)
7218 ("actual must have aliased components to match formal type &",
7222 end Validate_Array_Type_Instance;
7224 ------------------------------------
7225 -- Validate_Derived_Type_Instance --
7226 ------------------------------------
7228 procedure Validate_Derived_Type_Instance is
7229 Actual_Discr : Entity_Id;
7230 Ancestor_Discr : Entity_Id;
7233 -- If the parent type in the generic declaration is itself
7234 -- a previous formal type, then it is local to the generic
7235 -- and absent from the analyzed generic definition. In that
7236 -- case the ancestor is the instance of the formal (which must
7237 -- have been instantiated previously). Otherwise, the analyzed
7238 -- generic carries the parent type. If the parent type is defined
7239 -- in a previous formal package, then the scope of that formal
7240 -- package is that of the generic type itself, and it has already
7241 -- been mapped into the corresponding type in the actual package.
7243 -- Common case: parent type defined outside of the generic.
7245 if Is_Entity_Name (Subtype_Mark (Def))
7246 and then Present (Entity (Subtype_Mark (Def)))
7248 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7250 -- Check whether parent is defined in a previous formal package.
7253 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7256 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7258 -- The type may be a local derivation, or a type extension of
7259 -- a previous formal, or of a formal of a parent package.
7261 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
7263 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
7266 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7269 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7272 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7274 ("expect type derived from & in instantiation",
7275 Actual, First_Subtype (Ancestor));
7276 Abandon_Instantiation (Actual);
7279 -- Perform atomic/volatile checks (RM C.6(12))
7281 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7283 ("cannot have atomic actual type for non-atomic formal type",
7286 elsif Is_Volatile (Act_T)
7287 and then not Is_Volatile (Ancestor)
7288 and then Is_By_Reference_Type (Ancestor)
7291 ("cannot have volatile actual type for non-volatile formal type",
7295 -- It should not be necessary to check for unknown discriminants
7296 -- on Formal, but for some reason Has_Unknown_Discriminants is
7297 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7298 -- returns False. This needs fixing. ???
7300 if not Is_Indefinite_Subtype (A_Gen_T)
7301 and then not Unknown_Discriminants_Present (Formal)
7302 and then Is_Indefinite_Subtype (Act_T)
7305 ("actual subtype must be constrained", Actual);
7306 Abandon_Instantiation (Actual);
7309 if not Unknown_Discriminants_Present (Formal) then
7310 if Is_Constrained (Ancestor) then
7311 if not Is_Constrained (Act_T) then
7313 ("actual subtype must be constrained", Actual);
7314 Abandon_Instantiation (Actual);
7317 -- Ancestor is unconstrained
7319 elsif Is_Constrained (Act_T) then
7320 if Ekind (Ancestor) = E_Access_Type
7321 or else Is_Composite_Type (Ancestor)
7324 ("actual subtype must be unconstrained", Actual);
7325 Abandon_Instantiation (Actual);
7328 -- A class-wide type is only allowed if the formal has
7329 -- unknown discriminants.
7331 elsif Is_Class_Wide_Type (Act_T)
7332 and then not Has_Unknown_Discriminants (Ancestor)
7335 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7336 Abandon_Instantiation (Actual);
7338 -- Otherwise, the formal and actual shall have the same
7339 -- number of discriminants and each discriminant of the
7340 -- actual must correspond to a discriminant of the formal.
7342 elsif Has_Discriminants (Act_T)
7343 and then Has_Discriminants (Ancestor)
7345 Actual_Discr := First_Discriminant (Act_T);
7346 Ancestor_Discr := First_Discriminant (Ancestor);
7347 while Present (Actual_Discr)
7348 and then Present (Ancestor_Discr)
7350 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7351 not Present (Corresponding_Discriminant (Actual_Discr))
7354 ("discriminant & does not correspond " &
7355 "to ancestor discriminant", Actual, Actual_Discr);
7356 Abandon_Instantiation (Actual);
7359 Next_Discriminant (Actual_Discr);
7360 Next_Discriminant (Ancestor_Discr);
7363 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7365 ("actual for & must have same number of discriminants",
7367 Abandon_Instantiation (Actual);
7370 -- This case should be caught by the earlier check for
7371 -- for constrainedness, but the check here is added for
7374 elsif Has_Discriminants (Act_T) then
7376 ("actual for & must not have discriminants", Actual, Gen_T);
7377 Abandon_Instantiation (Actual);
7379 elsif Has_Discriminants (Ancestor) then
7381 ("actual for & must have known discriminants", Actual, Gen_T);
7382 Abandon_Instantiation (Actual);
7385 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7387 ("constraint on actual is incompatible with formal", Actual);
7388 Abandon_Instantiation (Actual);
7392 end Validate_Derived_Type_Instance;
7394 ------------------------------------
7395 -- Validate_Private_Type_Instance --
7396 ------------------------------------
7398 procedure Validate_Private_Type_Instance is
7399 Formal_Discr : Entity_Id;
7400 Actual_Discr : Entity_Id;
7401 Formal_Subt : Entity_Id;
7404 if (Is_Limited_Type (Act_T)
7405 or else Is_Limited_Composite (Act_T))
7406 and then not Is_Limited_Type (A_Gen_T)
7409 ("actual for non-limited & cannot be a limited type", Actual,
7411 Abandon_Instantiation (Actual);
7413 elsif Is_Indefinite_Subtype (Act_T)
7414 and then not Is_Indefinite_Subtype (A_Gen_T)
7418 ("actual for & must be a definite subtype", Actual, Gen_T);
7420 elsif not Is_Tagged_Type (Act_T)
7421 and then Is_Tagged_Type (A_Gen_T)
7424 ("actual for & must be a tagged type", Actual, Gen_T);
7426 elsif Has_Discriminants (A_Gen_T) then
7427 if not Has_Discriminants (Act_T) then
7429 ("actual for & must have discriminants", Actual, Gen_T);
7430 Abandon_Instantiation (Actual);
7432 elsif Is_Constrained (Act_T) then
7434 ("actual for & must be unconstrained", Actual, Gen_T);
7435 Abandon_Instantiation (Actual);
7438 Formal_Discr := First_Discriminant (A_Gen_T);
7439 Actual_Discr := First_Discriminant (Act_T);
7440 while Formal_Discr /= Empty loop
7441 if Actual_Discr = Empty then
7443 ("discriminants on actual do not match formal",
7445 Abandon_Instantiation (Actual);
7448 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7450 -- access discriminants match if designated types do.
7452 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7453 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7454 = E_Anonymous_Access_Type
7455 and then Get_Instance_Of (
7456 Designated_Type (Base_Type (Formal_Subt)))
7457 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7461 elsif Base_Type (Formal_Subt) /=
7462 Base_Type (Etype (Actual_Discr))
7465 ("types of actual discriminants must match formal",
7467 Abandon_Instantiation (Actual);
7469 elsif not Subtypes_Statically_Match
7470 (Formal_Subt, Etype (Actual_Discr))
7474 ("subtypes of actual discriminants must match formal",
7476 Abandon_Instantiation (Actual);
7479 Next_Discriminant (Formal_Discr);
7480 Next_Discriminant (Actual_Discr);
7483 if Actual_Discr /= Empty then
7485 ("discriminants on actual do not match formal",
7487 Abandon_Instantiation (Actual);
7494 end Validate_Private_Type_Instance;
7496 -- Start of processing for Instantiate_Type
7499 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7500 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7503 elsif not Is_Entity_Name (Actual)
7504 or else not Is_Type (Entity (Actual))
7507 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7508 Abandon_Instantiation (Actual);
7511 Act_T := Entity (Actual);
7513 -- Deal with fixed/floating restrictions
7515 if Is_Floating_Point_Type (Act_T) then
7516 Check_Restriction (No_Floating_Point, Actual);
7517 elsif Is_Fixed_Point_Type (Act_T) then
7518 Check_Restriction (No_Fixed_Point, Actual);
7521 -- Deal with error of using incomplete type as generic actual
7523 if Ekind (Act_T) = E_Incomplete_Type then
7524 if No (Underlying_Type (Act_T)) then
7525 Error_Msg_N ("premature use of incomplete type", Actual);
7526 Abandon_Instantiation (Actual);
7528 Act_T := Full_View (Act_T);
7529 Set_Entity (Actual, Act_T);
7531 if Has_Private_Component (Act_T) then
7533 ("premature use of type with private component", Actual);
7537 -- Deal with error of premature use of private type as generic actual
7539 elsif Is_Private_Type (Act_T)
7540 and then Is_Private_Type (Base_Type (Act_T))
7541 and then not Is_Generic_Type (Act_T)
7542 and then not Is_Derived_Type (Act_T)
7543 and then No (Full_View (Root_Type (Act_T)))
7545 Error_Msg_N ("premature use of private type", Actual);
7547 elsif Has_Private_Component (Act_T) then
7549 ("premature use of type with private component", Actual);
7552 Set_Instance_Of (A_Gen_T, Act_T);
7554 -- If the type is generic, the class-wide type may also be used
7556 if Is_Tagged_Type (A_Gen_T)
7557 and then Is_Tagged_Type (Act_T)
7558 and then not Is_Class_Wide_Type (A_Gen_T)
7560 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7561 Class_Wide_Type (Act_T));
7564 if not Is_Abstract (A_Gen_T)
7565 and then Is_Abstract (Act_T)
7568 ("actual of non-abstract formal cannot be abstract", Actual);
7571 if Is_Scalar_Type (Gen_T) then
7572 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7577 when N_Formal_Private_Type_Definition =>
7578 Validate_Private_Type_Instance;
7580 when N_Formal_Derived_Type_Definition =>
7581 Validate_Derived_Type_Instance;
7583 when N_Formal_Discrete_Type_Definition =>
7584 if not Is_Discrete_Type (Act_T) then
7586 ("expect discrete type in instantiation of&", Actual, Gen_T);
7587 Abandon_Instantiation (Actual);
7590 when N_Formal_Signed_Integer_Type_Definition =>
7591 if not Is_Signed_Integer_Type (Act_T) then
7593 ("expect signed integer type in instantiation of&",
7595 Abandon_Instantiation (Actual);
7598 when N_Formal_Modular_Type_Definition =>
7599 if not Is_Modular_Integer_Type (Act_T) then
7601 ("expect modular type in instantiation of &", Actual, Gen_T);
7602 Abandon_Instantiation (Actual);
7605 when N_Formal_Floating_Point_Definition =>
7606 if not Is_Floating_Point_Type (Act_T) then
7608 ("expect float type in instantiation of &", Actual, Gen_T);
7609 Abandon_Instantiation (Actual);
7612 when N_Formal_Ordinary_Fixed_Point_Definition =>
7613 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7615 ("expect ordinary fixed point type in instantiation of &",
7617 Abandon_Instantiation (Actual);
7620 when N_Formal_Decimal_Fixed_Point_Definition =>
7621 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7623 ("expect decimal type in instantiation of &",
7625 Abandon_Instantiation (Actual);
7628 when N_Array_Type_Definition =>
7629 Validate_Array_Type_Instance;
7631 when N_Access_To_Object_Definition =>
7632 Validate_Access_Type_Instance;
7634 when N_Access_Function_Definition |
7635 N_Access_Procedure_Definition =>
7636 Validate_Access_Subprogram_Instance;
7639 raise Program_Error;
7644 Make_Subtype_Declaration (Loc,
7645 Defining_Identifier => New_Copy (Gen_T),
7646 Subtype_Indication => New_Reference_To (Act_T, Loc));
7648 if Is_Private_Type (Act_T) then
7649 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7652 -- Flag actual derived types so their elaboration produces the
7653 -- appropriate renamings for the primitive operations of the ancestor.
7654 -- Flag actual for formal private types as well, to determine whether
7655 -- operations in the private part may override inherited operations.
7657 if Nkind (Def) = N_Formal_Derived_Type_Definition
7658 or else Nkind (Def) = N_Formal_Private_Type_Definition
7660 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7664 end Instantiate_Type;
7666 ---------------------
7667 -- Is_In_Main_Unit --
7668 ---------------------
7670 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7671 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7673 Current_Unit : Node_Id;
7676 if Unum = Main_Unit then
7679 -- If the current unit is a subunit then it is either the main unit
7680 -- or is being compiled as part of the main unit.
7682 elsif Nkind (N) = N_Compilation_Unit then
7683 return Nkind (Unit (N)) = N_Subunit;
7686 Current_Unit := Parent (N);
7687 while Present (Current_Unit)
7688 and then Nkind (Current_Unit) /= N_Compilation_Unit
7690 Current_Unit := Parent (Current_Unit);
7693 -- The instantiation node is in the main unit, or else the current
7694 -- node (perhaps as the result of nested instantiations) is in the
7695 -- main unit, or in the declaration of the main unit, which in this
7696 -- last case must be a body.
7698 return Unum = Main_Unit
7699 or else Current_Unit = Cunit (Main_Unit)
7700 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7701 or else (Present (Library_Unit (Current_Unit))
7702 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7703 end Is_In_Main_Unit;
7705 ----------------------------
7706 -- Load_Parent_Of_Generic --
7707 ----------------------------
7709 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7710 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7711 True_Parent : Node_Id;
7712 Inst_Node : Node_Id;
7714 Save_Style_Check : Boolean := Style_Check;
7717 if not In_Same_Source_Unit (N, Spec)
7718 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7719 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7720 and then not Is_In_Main_Unit (Spec))
7722 -- Find body of parent of spec, and analyze it. A special case
7723 -- arises when the parent is an instantiation, that is to say when
7724 -- we are currently instantiating a nested generic. In that case,
7725 -- there is no separate file for the body of the enclosing instance.
7726 -- Instead, the enclosing body must be instantiated as if it were
7727 -- a pending instantiation, in order to produce the body for the
7728 -- nested generic we require now. Note that in that case the
7729 -- generic may be defined in a package body, the instance defined
7730 -- in the same package body, and the original enclosing body may not
7731 -- be in the main unit.
7733 True_Parent := Parent (Spec);
7736 while Present (True_Parent)
7737 and then Nkind (True_Parent) /= N_Compilation_Unit
7739 if Nkind (True_Parent) = N_Package_Declaration
7741 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7743 -- Parent is a compilation unit that is an instantiation.
7744 -- Instantiation node has been replaced with package decl.
7746 Inst_Node := Original_Node (True_Parent);
7749 elsif Nkind (True_Parent) = N_Package_Declaration
7750 and then Present (Generic_Parent (Specification (True_Parent)))
7752 -- Parent is an instantiation within another specification.
7753 -- Declaration for instance has been inserted before original
7754 -- instantiation node. A direct link would be preferable?
7756 Inst_Node := Next (True_Parent);
7758 while Present (Inst_Node)
7759 and then Nkind (Inst_Node) /= N_Package_Instantiation
7764 -- If the instance appears within a generic, and the generic
7765 -- unit is defined within a formal package of the enclosing
7766 -- generic, there is no generic body available, and none
7767 -- needed. A more precise test should be used ???
7769 if No (Inst_Node) then
7775 True_Parent := Parent (True_Parent);
7779 if Present (Inst_Node) then
7781 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7783 -- Instantiation node and declaration of instantiated package
7784 -- were exchanged when only the declaration was needed.
7785 -- Restore instantiation node before proceeding with body.
7787 Set_Unit (Parent (True_Parent), Inst_Node);
7790 -- Now complete instantiation of enclosing body, if it appears
7791 -- in some other unit. If it appears in the current unit, the
7792 -- body will have been instantiated already.
7794 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7795 Instantiate_Package_Body
7796 (Pending_Body_Info'(
7797 Inst_Node, True_Parent, Expander_Active,
7798 Get_Code_Unit (Sloc (Inst_Node))));
7802 Opt.Style_Check := False;
7803 Load_Needed_Body (Comp_Unit, OK);
7804 Opt.Style_Check := Save_Style_Check;
7807 and then Unit_Requires_Body (Defining_Entity (Spec))
7810 Bname : constant Unit_Name_Type :=
7811 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7814 Error_Msg_Unit_1 := Bname;
7815 Error_Msg_N ("this instantiation requires$!", N);
7817 Get_File_Name (Bname, Subunit => False);
7818 Error_Msg_N ("\but file{ was not found!", N);
7819 raise Unrecoverable_Error;
7825 -- If loading the parent of the generic caused an instantiation
7826 -- circularity, we abandon compilation at this point, because
7827 -- otherwise in some cases we get into trouble with infinite
7828 -- recursions after this point.
7830 if Circularity_Detected then
7831 raise Unrecoverable_Error;
7834 end Load_Parent_Of_Generic;
7836 -----------------------
7837 -- Move_Freeze_Nodes --
7838 -----------------------
7840 procedure Move_Freeze_Nodes
7841 (Out_Of : Entity_Id;
7846 Next_Decl : Node_Id;
7847 Next_Node : Node_Id := After;
7850 function Is_Outer_Type (T : Entity_Id) return Boolean;
7851 -- Check whether entity is declared in a scope external to that
7852 -- of the generic unit.
7858 function Is_Outer_Type (T : Entity_Id) return Boolean is
7859 Scop : Entity_Id := Scope (T);
7862 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7866 while Scop /= Standard_Standard loop
7868 if Scop = Out_Of then
7871 Scop := Scope (Scop);
7879 -- Start of processing for Move_Freeze_Nodes
7886 -- First remove the freeze nodes that may appear before all other
7890 while Present (Decl)
7891 and then Nkind (Decl) = N_Freeze_Entity
7892 and then Is_Outer_Type (Entity (Decl))
7894 Decl := Remove_Head (L);
7895 Insert_After (Next_Node, Decl);
7896 Set_Analyzed (Decl, False);
7901 -- Next scan the list of declarations and remove each freeze node that
7902 -- appears ahead of the current node.
7904 while Present (Decl) loop
7905 while Present (Next (Decl))
7906 and then Nkind (Next (Decl)) = N_Freeze_Entity
7907 and then Is_Outer_Type (Entity (Next (Decl)))
7909 Next_Decl := Remove_Next (Decl);
7910 Insert_After (Next_Node, Next_Decl);
7911 Set_Analyzed (Next_Decl, False);
7912 Next_Node := Next_Decl;
7915 -- If the declaration is a nested package or concurrent type, then
7916 -- recurse. Nested generic packages will have been processed from the
7919 if Nkind (Decl) = N_Package_Declaration then
7920 Spec := Specification (Decl);
7922 elsif Nkind (Decl) = N_Task_Type_Declaration then
7923 Spec := Task_Definition (Decl);
7925 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7926 Spec := Protected_Definition (Decl);
7932 if Present (Spec) then
7933 Move_Freeze_Nodes (Out_Of, Next_Node,
7934 Visible_Declarations (Spec));
7935 Move_Freeze_Nodes (Out_Of, Next_Node,
7936 Private_Declarations (Spec));
7941 end Move_Freeze_Nodes;
7947 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7949 return Generic_Renamings.Table (E).Next_In_HTable;
7952 ------------------------
7953 -- Preanalyze_Actuals --
7954 ------------------------
7956 procedure Pre_Analyze_Actuals (N : Node_Id) is
7959 Errs : Int := Serious_Errors_Detected;
7962 Assoc := First (Generic_Associations (N));
7964 while Present (Assoc) loop
7965 Act := Explicit_Generic_Actual_Parameter (Assoc);
7967 -- Within a nested instantiation, a defaulted actual is an
7968 -- empty association, so nothing to analyze. If the actual for
7969 -- a subprogram is an attribute, analyze prefix only, because
7970 -- actual is not a complete attribute reference.
7971 -- String literals may be operators, but at this point we do not
7972 -- know whether the actual is a formal subprogram or a string.
7977 elsif Nkind (Act) = N_Attribute_Reference then
7978 Analyze (Prefix (Act));
7980 elsif Nkind (Act) = N_Explicit_Dereference then
7981 Analyze (Prefix (Act));
7983 elsif Nkind (Act) /= N_Operator_Symbol then
7987 if Errs /= Serious_Errors_Detected then
7988 Abandon_Instantiation (Act);
7993 end Pre_Analyze_Actuals;
7999 procedure Remove_Parent (In_Body : Boolean := False) is
8000 S : Entity_Id := Current_Scope;
8006 -- After child instantiation is complete, remove from scope stack
8007 -- the extra copy of the current scope, and then remove parent
8013 while Current_Scope /= S loop
8015 End_Package_Scope (Current_Scope);
8017 if In_Open_Scopes (P) then
8018 E := First_Entity (P);
8020 while Present (E) loop
8021 Set_Is_Immediately_Visible (E, True);
8025 if Is_Generic_Instance (Current_Scope)
8026 and then P /= Current_Scope
8028 -- We are within an instance of some sibling. Retain
8029 -- visibility of parent, for proper subsequent cleanup.
8031 Set_In_Private_Part (P);
8034 elsif not In_Open_Scopes (Scope (P)) then
8035 Set_Is_Immediately_Visible (P, False);
8039 -- Reset visibility of entities in the enclosing scope.
8041 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8042 Hidden := First_Elmt (Hidden_Entities);
8044 while Present (Hidden) loop
8045 Set_Is_Immediately_Visible (Node (Hidden), True);
8050 -- Each body is analyzed separately, and there is no context
8051 -- that needs preserving from one body instance to the next,
8052 -- so remove all parent scopes that have been installed.
8054 while Present (S) loop
8055 End_Package_Scope (S);
8057 exit when S = Standard_Standard;
8067 procedure Restore_Env is
8068 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8071 Ada_83 := Saved.Ada_83;
8073 if No (Current_Instantiated_Parent.Act_Id) then
8075 -- Restore environment after subprogram inlining
8077 Restore_Private_Views (Empty);
8080 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8081 Exchanged_Views := Saved.Exchanged_Views;
8082 Hidden_Entities := Saved.Hidden_Entities;
8083 Current_Sem_Unit := Saved.Current_Sem_Unit;
8085 Instance_Envs.Decrement_Last;
8088 ---------------------------
8089 -- Restore_Private_Views --
8090 ---------------------------
8092 procedure Restore_Private_Views
8093 (Pack_Id : Entity_Id;
8094 Is_Package : Boolean := True)
8103 M := First_Elmt (Exchanged_Views);
8104 while Present (M) loop
8107 -- Subtypes of types whose views have been exchanged, and that
8108 -- are defined within the instance, were not on the list of
8109 -- Private_Dependents on entry to the instance, so they have to
8110 -- be exchanged explicitly now, in order to remain consistent with
8111 -- the view of the parent type.
8113 if Ekind (Typ) = E_Private_Type
8114 or else Ekind (Typ) = E_Limited_Private_Type
8115 or else Ekind (Typ) = E_Record_Type_With_Private
8117 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8119 while Present (Dep_Elmt) loop
8120 Dep_Typ := Node (Dep_Elmt);
8122 if Scope (Dep_Typ) = Pack_Id
8123 and then Present (Full_View (Dep_Typ))
8125 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8126 Exchange_Declarations (Dep_Typ);
8129 Next_Elmt (Dep_Elmt);
8133 Exchange_Declarations (Node (M));
8137 if No (Pack_Id) then
8141 -- Make the generic formal parameters private, and make the formal
8142 -- types into subtypes of the actuals again.
8144 E := First_Entity (Pack_Id);
8146 while Present (E) loop
8147 Set_Is_Hidden (E, True);
8150 and then Nkind (Parent (E)) = N_Subtype_Declaration
8152 Set_Is_Generic_Actual_Type (E, False);
8154 -- An unusual case of aliasing: the actual may also be directly
8155 -- visible in the generic, and be private there, while it is
8156 -- fully visible in the context of the instance. The internal
8157 -- subtype is private in the instance, but has full visibility
8158 -- like its parent in the enclosing scope. This enforces the
8159 -- invariant that the privacy status of all private dependents of
8160 -- a type coincide with that of the parent type. This can only
8161 -- happen when a generic child unit is instantiated within a
8164 if Is_Private_Type (E)
8165 and then not Is_Private_Type (Etype (E))
8167 Exchange_Declarations (E);
8170 elsif Ekind (E) = E_Package then
8172 -- The end of the renaming list is the renaming of the generic
8173 -- package itself. If the instance is a subprogram, all entities
8174 -- in the corresponding package are renamings. If this entity is
8175 -- a formal package, make its own formals private as well. The
8176 -- actual in this case is itself the renaming of an instantiation.
8177 -- If the entity is not a package renaming, it is the entity
8178 -- created to validate formal package actuals: ignore.
8180 -- If the actual is itself a formal package for the enclosing
8181 -- generic, or the actual for such a formal package, it remains
8182 -- visible after the current instance, and therefore nothing
8183 -- needs to be done either, except to keep it accessible.
8186 and then Renamed_Object (E) = Pack_Id
8190 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8193 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8194 Set_Is_Hidden (E, False);
8198 Act_P : Entity_Id := Renamed_Object (E);
8199 Id : Entity_Id := First_Entity (Act_P);
8203 and then Id /= First_Private_Entity (Act_P)
8205 Set_Is_Hidden (Id, True);
8206 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8207 exit when Ekind (Id) = E_Package
8208 and then Renamed_Object (Id) = Act_P;
8219 end Restore_Private_Views;
8226 (Gen_Unit : Entity_Id;
8227 Act_Unit : Entity_Id)
8229 Saved : Instance_Env;
8232 Saved.Ada_83 := Ada_83;
8233 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8234 Saved.Exchanged_Views := Exchanged_Views;
8235 Saved.Hidden_Entities := Hidden_Entities;
8236 Saved.Current_Sem_Unit := Current_Sem_Unit;
8237 Instance_Envs.Increment_Last;
8238 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8240 -- Regardless of the current mode, predefined units are analyzed in
8241 -- Ada95 mode, and Ada83 checks don't apply.
8243 if Is_Internal_File_Name
8244 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8245 Renamings_Included => True) then
8249 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8250 Exchanged_Views := New_Elmt_List;
8251 Hidden_Entities := New_Elmt_List;
8254 ----------------------------
8255 -- Save_Global_References --
8256 ----------------------------
8258 procedure Save_Global_References (N : Node_Id) is
8259 Gen_Scope : Entity_Id;
8263 function Is_Global (E : Entity_Id) return Boolean;
8264 -- Check whether entity is defined outside of generic unit.
8265 -- Examine the scope of an entity, and the scope of the scope,
8266 -- etc, until we find either Standard, in which case the entity
8267 -- is global, or the generic unit itself, which indicates that
8268 -- the entity is local. If the entity is the generic unit itself,
8269 -- as in the case of a recursive call, or the enclosing generic unit,
8270 -- if different from the current scope, then it is local as well,
8271 -- because it will be replaced at the point of instantiation. On
8272 -- the other hand, if it is a reference to a child unit of a common
8273 -- ancestor, which appears in an instantiation, it is global because
8274 -- it is used to denote a specific compilation unit at the time the
8275 -- instantiations will be analyzed.
8277 procedure Reset_Entity (N : Node_Id);
8278 -- Save semantic information on global entity, so that it is not
8279 -- resolved again at instantiation time.
8281 procedure Save_Entity_Descendants (N : Node_Id);
8282 -- Apply Save_Global_References to the two syntactic descendants of
8283 -- non-terminal nodes that carry an Associated_Node and are processed
8284 -- through Reset_Entity. Once the global entity (if any) has been
8285 -- captured together with its type, only two syntactic descendants
8286 -- need to be traversed to complete the processing of the tree rooted
8287 -- at N. This applies to Selected_Components, Expanded_Names, and to
8288 -- Operator nodes. N can also be a character literal, identifier, or
8289 -- operator symbol node, but the call has no effect in these cases.
8291 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8292 -- Default actuals in nested instances must be handled specially
8293 -- because there is no link to them from the original tree. When an
8294 -- actual subprogram is given by a default, we add an explicit generic
8295 -- association for it in the instantiation node. When we save the
8296 -- global references on the name of the instance, we recover the list
8297 -- of generic associations, and add an explicit one to the original
8298 -- generic tree, through which a global actual can be preserved.
8299 -- Similarly, if a child unit is instantiated within a sibling, in the
8300 -- context of the parent, we must preserve the identifier of the parent
8301 -- so that it can be properly resolved in a subsequent instantiation.
8303 procedure Save_Global_Descendant (D : Union_Id);
8304 -- Apply Save_Global_References recursively to the descendents of
8307 procedure Save_References (N : Node_Id);
8308 -- This is the recursive procedure that does the work, once the
8309 -- enclosing generic scope has been established.
8315 function Is_Global (E : Entity_Id) return Boolean is
8316 Se : Entity_Id := Scope (E);
8318 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8319 -- Determine whether the parent node of a reference to a child unit
8320 -- denotes an instantiation or a formal package, in which case the
8321 -- reference to the child unit is global, even if it appears within
8322 -- the current scope (e.g. when the instance appears within the body
8325 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8327 return (Nkind (Decl) in N_Generic_Instantiation
8329 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8330 end Is_Instance_Node;
8332 -- Start of processing for Is_Global
8335 if E = Gen_Scope then
8338 elsif E = Standard_Standard then
8341 elsif Is_Child_Unit (E)
8342 and then (Is_Instance_Node (Parent (N2))
8343 or else (Nkind (Parent (N2)) = N_Expanded_Name
8344 and then N2 = Selector_Name (Parent (N2))
8345 and then Is_Instance_Node (Parent (Parent (N2)))))
8350 while Se /= Gen_Scope loop
8351 if Se = Standard_Standard then
8366 procedure Reset_Entity (N : Node_Id) is
8368 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8369 -- The type of N2 is global to the generic unit. Save the
8370 -- type in the generic node.
8372 ---------------------
8373 -- Set_Global_Type --
8374 ---------------------
8376 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8377 Typ : constant Entity_Id := Etype (N2);
8383 and then Has_Private_View (Entity (N))
8385 -- If the entity of N is not the associated node, this is
8386 -- a nested generic and it has an associated node as well,
8387 -- whose type is already the full view (see below). Indicate
8388 -- that the original node has a private view.
8390 Set_Has_Private_View (N);
8393 -- If not a private type, nothing else to do
8395 if not Is_Private_Type (Typ) then
8396 if Is_Array_Type (Typ)
8397 and then Is_Private_Type (Component_Type (Typ))
8399 Set_Has_Private_View (N);
8402 -- If it is a derivation of a private type in a context where
8403 -- no full view is needed, nothing to do either.
8405 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8408 -- Otherwise mark the type for flipping and use the full_view
8412 Set_Has_Private_View (N);
8414 if Present (Full_View (Typ)) then
8415 Set_Etype (N2, Full_View (Typ));
8418 end Set_Global_Type;
8420 -- Start of processing for Reset_Entity
8423 N2 := Get_Associated_Node (N);
8427 if Is_Global (E) then
8428 Set_Global_Type (N, N2);
8430 elsif Nkind (N) = N_Op_Concat
8431 and then Is_Generic_Type (Etype (N2))
8433 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8434 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8435 and then Is_Intrinsic_Subprogram (E)
8440 -- Entity is local. Mark generic node as unresolved.
8441 -- Note that now it does not have an entity.
8443 Set_Associated_Node (N, Empty);
8444 Set_Etype (N, Empty);
8447 if (Nkind (Parent (N)) = N_Package_Instantiation
8448 or else Nkind (Parent (N)) = N_Function_Instantiation
8449 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8450 and then N = Name (Parent (N))
8452 Save_Global_Defaults (Parent (N), Parent (N2));
8455 elsif Nkind (Parent (N)) = N_Selected_Component
8456 and then Nkind (Parent (N2)) = N_Expanded_Name
8459 if Is_Global (Entity (Parent (N2))) then
8460 Change_Selected_Component_To_Expanded_Name (Parent (N));
8461 Set_Associated_Node (Parent (N), Parent (N2));
8462 Set_Global_Type (Parent (N), Parent (N2));
8463 Save_Entity_Descendants (N);
8465 -- If this is a reference to the current generic entity,
8466 -- replace it with a simple name. This is to avoid anomalies
8467 -- when the enclosing scope is also a generic unit, in which
8468 -- case the selected component will not resolve to the current
8469 -- unit within an instance of the outer one. Ditto if the
8470 -- entity is an enclosing scope, e.g. a parent unit.
8472 elsif In_Open_Scopes (Entity (Parent (N2)))
8473 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8475 Rewrite (Parent (N),
8476 Make_Identifier (Sloc (N),
8477 Chars => Chars (Selector_Name (Parent (N2)))));
8480 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8481 or else Nkind (Parent (Parent (N)))
8482 = N_Function_Instantiation
8483 or else Nkind (Parent (Parent (N)))
8484 = N_Procedure_Instantiation)
8485 and then Parent (N) = Name (Parent (Parent (N)))
8487 Save_Global_Defaults
8488 (Parent (Parent (N)), Parent (Parent ((N2))));
8491 -- A selected component may denote a static constant that has
8492 -- been folded. Make the same replacement in original tree.
8494 elsif Nkind (Parent (N)) = N_Selected_Component
8495 and then (Nkind (Parent (N2)) = N_Integer_Literal
8496 or else Nkind (Parent (N2)) = N_Real_Literal)
8498 Rewrite (Parent (N),
8499 New_Copy (Parent (N2)));
8500 Set_Analyzed (Parent (N), False);
8502 -- A selected component may be transformed into a parameterless
8503 -- function call. If the called entity is global, rewrite the
8504 -- node appropriately, i.e. as an extended name for the global
8507 elsif Nkind (Parent (N)) = N_Selected_Component
8508 and then Nkind (Parent (N2)) = N_Function_Call
8509 and then Is_Global (Entity (Name (Parent (N2))))
8511 Change_Selected_Component_To_Expanded_Name (Parent (N));
8512 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8513 Set_Global_Type (Parent (N), Name (Parent (N2)));
8514 Save_Entity_Descendants (N);
8517 -- Entity is local. Reset in generic unit, so that node
8518 -- is resolved anew at the point of instantiation.
8520 Set_Associated_Node (N, Empty);
8521 Set_Etype (N, Empty);
8525 -----------------------------
8526 -- Save_Entity_Descendants --
8527 -----------------------------
8529 procedure Save_Entity_Descendants (N : Node_Id) is
8533 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
8534 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
8537 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
8539 when N_Expanded_Name | N_Selected_Component =>
8540 Save_Global_Descendant (Union_Id (Prefix (N)));
8541 Save_Global_Descendant (Union_Id (Selector_Name (N)));
8543 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
8547 raise Program_Error;
8549 end Save_Entity_Descendants;
8551 --------------------------
8552 -- Save_Global_Defaults --
8553 --------------------------
8555 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8556 Loc : constant Source_Ptr := Sloc (N1);
8557 Assoc1 : List_Id := Generic_Associations (N1);
8558 Assoc2 : List_Id := Generic_Associations (N2);
8562 Gen_Id : Entity_Id := Get_Generic_Entity (N2);
8568 if Present (Assoc1) then
8569 Act1 := First (Assoc1);
8572 Set_Generic_Associations (N1, New_List);
8573 Assoc1 := Generic_Associations (N1);
8576 if Present (Assoc2) then
8577 Act2 := First (Assoc2);
8582 while Present (Act1) and then Present (Act2) loop
8587 -- Find the associations added for default suprograms.
8589 if Present (Act2) then
8590 while Nkind (Act2) /= N_Generic_Association
8591 or else No (Entity (Selector_Name (Act2)))
8592 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8597 -- Add a similar association if the default is global. The
8598 -- renaming declaration for the actual has been analyzed, and
8599 -- its alias is the program it renames. Link the actual in the
8600 -- original generic tree with the node in the analyzed tree.
8602 while Present (Act2) loop
8603 Subp := Entity (Selector_Name (Act2));
8604 Def := Explicit_Generic_Actual_Parameter (Act2);
8606 -- Following test is defence against rubbish errors
8608 if No (Alias (Subp)) then
8612 -- Retrieve the resolved actual from the renaming declaration
8613 -- created for the instantiated formal.
8615 Actual := Entity (Name (Parent (Parent (Subp))));
8616 Set_Entity (Def, Actual);
8617 Set_Etype (Def, Etype (Actual));
8619 if Is_Global (Actual) then
8621 Make_Generic_Association (Loc,
8622 Selector_Name => New_Occurrence_Of (Subp, Loc),
8623 Explicit_Generic_Actual_Parameter =>
8624 New_Occurrence_Of (Actual, Loc));
8627 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8629 Append (Ndec, Assoc1);
8631 -- If there are other defaults, add a dummy association
8632 -- in case there are other defaulted formals with the same
8635 elsif Present (Next (Act2)) then
8637 Make_Generic_Association (Loc,
8638 Selector_Name => New_Occurrence_Of (Subp, Loc),
8639 Explicit_Generic_Actual_Parameter => Empty);
8641 Append (Ndec, Assoc1);
8648 if Nkind (Name (N1)) = N_Identifier
8649 and then Is_Child_Unit (Gen_Id)
8650 and then Is_Global (Gen_Id)
8651 and then Is_Generic_Unit (Scope (Gen_Id))
8652 and then In_Open_Scopes (Scope (Gen_Id))
8654 -- This is an instantiation of a child unit within a sibling,
8655 -- so that the generic parent is in scope. An eventual instance
8656 -- must occur within the scope of an instance of the parent.
8657 -- Make name in instance into an expanded name, to preserve the
8658 -- identifier of the parent, so it can be resolved subsequently.
8661 Make_Expanded_Name (Loc,
8662 Chars => Chars (Gen_Id),
8663 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8664 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8665 Set_Entity (Name (N2), Gen_Id);
8668 Make_Expanded_Name (Loc,
8669 Chars => Chars (Gen_Id),
8670 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8671 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8673 Set_Associated_Node (Name (N1), Name (N2));
8674 Set_Associated_Node (Prefix (Name (N1)), Empty);
8676 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8677 Set_Etype (Name (N1), Etype (Gen_Id));
8680 end Save_Global_Defaults;
8682 ----------------------------
8683 -- Save_Global_Descendant --
8684 ----------------------------
8686 procedure Save_Global_Descendant (D : Union_Id) is
8690 if D in Node_Range then
8691 if D = Union_Id (Empty) then
8694 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8695 Save_References (Node_Id (D));
8698 elsif D in List_Range then
8699 if D = Union_Id (No_List)
8700 or else Is_Empty_List (List_Id (D))
8705 N1 := First (List_Id (D));
8706 while Present (N1) loop
8707 Save_References (N1);
8712 -- Element list or other non-node field, nothing to do
8717 end Save_Global_Descendant;
8719 ---------------------
8720 -- Save_References --
8721 ---------------------
8723 -- This is the recursive procedure that does the work, once the
8724 -- enclosing generic scope has been established. We have to treat
8725 -- specially a number of node rewritings that are required by semantic
8726 -- processing and which change the kind of nodes in the generic copy:
8727 -- typically constant-folding, replacing an operator node by a string
8728 -- literal, or a selected component by an expanded name. In each of
8729 -- those cases, the transformation is propagated to the generic unit.
8731 procedure Save_References (N : Node_Id) is
8736 elsif (Nkind (N) = N_Character_Literal
8737 or else Nkind (N) = N_Operator_Symbol)
8739 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8742 elsif Nkind (N) = N_Operator_Symbol
8743 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
8745 Change_Operator_Symbol_To_String_Literal (N);
8748 elsif Nkind (N) in N_Op then
8750 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8752 if Nkind (N) = N_Op_Concat then
8753 Set_Is_Component_Left_Opnd (N,
8754 Is_Component_Left_Opnd (Get_Associated_Node (N)));
8756 Set_Is_Component_Right_Opnd (N,
8757 Is_Component_Right_Opnd (Get_Associated_Node (N)));
8762 -- Node may be transformed into call to a user-defined operator
8764 N2 := Get_Associated_Node (N);
8766 if Nkind (N2) = N_Function_Call then
8767 E := Entity (Name (N2));
8770 and then Is_Global (E)
8772 Set_Etype (N, Etype (N2));
8774 Set_Associated_Node (N, Empty);
8775 Set_Etype (N, Empty);
8778 elsif Nkind (N2) = N_Integer_Literal
8779 or else Nkind (N2) = N_Real_Literal
8780 or else Nkind (N2) = N_String_Literal
8781 or else (Nkind (N2) = N_Identifier
8783 Ekind (Entity (N2)) = E_Enumeration_Literal)
8785 -- Operation was constant-folded, perform the same
8786 -- replacement in generic.
8788 -- Note: we do a Replace here rather than a Rewrite,
8789 -- which is a definite violation of the standard rules
8790 -- with regard to retrievability of the original tree,
8791 -- and likely ASIS bugs or at least irregularities are
8792 -- caused by this choice.
8794 -- The reason we do this is that the appropriate original
8795 -- nodes are never constructed (we don't go applying the
8796 -- generic instantiation to rewritten nodes in general).
8797 -- We could try to create an appropriate copy but it would
8798 -- be hard work and does not seem worth while, because
8799 -- the original expression is accessible in the generic,
8800 -- and ASIS rules for traversing instances are fuzzy.
8802 Replace (N, New_Copy (N2));
8803 Set_Analyzed (N, False);
8807 -- Complete the check on operands, if node has not been
8810 if Nkind (N) in N_Op then
8811 Save_Entity_Descendants (N);
8814 elsif Nkind (N) = N_Identifier then
8815 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8817 -- If this is a discriminant reference, always save it.
8818 -- It is used in the instance to find the corresponding
8819 -- discriminant positionally rather than by name.
8821 Set_Original_Discriminant
8822 (N, Original_Discriminant (Get_Associated_Node (N)));
8826 N2 := Get_Associated_Node (N);
8828 if Nkind (N2) = N_Function_Call then
8829 E := Entity (Name (N2));
8831 -- Name resolves to a call to parameterless function.
8832 -- If original entity is global, mark node as resolved.
8835 and then Is_Global (E)
8837 Set_Etype (N, Etype (N2));
8839 Set_Associated_Node (N, Empty);
8840 Set_Etype (N, Empty);
8844 Nkind (N2) = N_Integer_Literal or else
8845 Nkind (N2) = N_Real_Literal or else
8846 Nkind (N2) = N_String_Literal
8848 -- Name resolves to named number that is constant-folded,
8849 -- or to string literal from concatenation.
8850 -- Perform the same replacement in generic.
8852 Rewrite (N, New_Copy (N2));
8853 Set_Analyzed (N, False);
8855 elsif Nkind (N2) = N_Explicit_Dereference then
8857 -- An identifier is rewritten as a dereference if it is
8858 -- the prefix in a selected component, and it denotes an
8859 -- access to a composite type, or a parameterless function
8860 -- call that returns an access type.
8862 -- Check whether corresponding entity in prefix is global.
8864 if Is_Entity_Name (Prefix (N2))
8865 and then Present (Entity (Prefix (N2)))
8866 and then Is_Global (Entity (Prefix (N2)))
8869 Make_Explicit_Dereference (Sloc (N),
8870 Prefix => Make_Identifier (Sloc (N),
8871 Chars => Chars (N))));
8872 Set_Associated_Node (Prefix (N), Prefix (N2));
8874 elsif Nkind (Prefix (N2)) = N_Function_Call
8875 and then Is_Global (Entity (Name (Prefix (N2))))
8878 Make_Explicit_Dereference (Sloc (N),
8879 Prefix => Make_Function_Call (Sloc (N),
8881 Make_Identifier (Sloc (N),
8882 Chars => Chars (N)))));
8885 (Name (Prefix (N)), Name (Prefix (N2)));
8888 Set_Associated_Node (N, Empty);
8889 Set_Etype (N, Empty);
8892 -- The subtype mark of a nominally unconstrained object
8893 -- is rewritten as a subtype indication using the bounds
8894 -- of the expression. Recover the original subtype mark.
8896 elsif Nkind (N2) = N_Subtype_Indication
8897 and then Is_Entity_Name (Original_Node (N2))
8899 Set_Associated_Node (N, Original_Node (N2));
8907 elsif Nkind (N) in N_Entity then
8912 use Atree.Unchecked_Access;
8913 -- This code section is part of implementing an untyped tree
8914 -- traversal, so it needs direct access to node fields.
8917 if Nkind (N) = N_Aggregate
8919 Nkind (N) = N_Extension_Aggregate
8921 N2 := Get_Associated_Node (N);
8924 or else No (Etype (N2))
8925 or else not Is_Global (Etype (N2))
8927 Set_Associated_Node (N, Empty);
8930 Save_Global_Descendant (Field1 (N));
8931 Save_Global_Descendant (Field2 (N));
8932 Save_Global_Descendant (Field3 (N));
8933 Save_Global_Descendant (Field5 (N));
8935 -- All other cases than aggregates
8938 Save_Global_Descendant (Field1 (N));
8939 Save_Global_Descendant (Field2 (N));
8940 Save_Global_Descendant (Field3 (N));
8941 Save_Global_Descendant (Field4 (N));
8942 Save_Global_Descendant (Field5 (N));
8946 end Save_References;
8948 -- Start of processing for Save_Global_References
8951 Gen_Scope := Current_Scope;
8953 -- If the generic unit is a child unit, references to entities in
8954 -- the parent are treated as local, because they will be resolved
8955 -- anew in the context of the instance of the parent.
8957 while Is_Child_Unit (Gen_Scope)
8958 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8960 Gen_Scope := Scope (Gen_Scope);
8963 Save_References (N);
8964 end Save_Global_References;
8966 ---------------------
8967 -- Set_Copied_Sloc --
8968 ---------------------
8970 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8972 Create_Instantiation_Source (N, E, S_Adjustment);
8973 end Set_Copied_Sloc;
8975 ---------------------
8976 -- Set_Instance_Of --
8977 ---------------------
8979 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8981 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8982 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8983 Generic_Renamings.Increment_Last;
8984 end Set_Instance_Of;
8986 --------------------
8987 -- Set_Next_Assoc --
8988 --------------------
8990 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8992 Generic_Renamings.Table (E).Next_In_HTable := Next;
8999 procedure Start_Generic is
9001 -- ??? I am sure more things could be factored out in this
9002 -- routine. Should probably be done at a later stage.
9004 Generic_Flags.Increment_Last;
9005 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9006 Inside_A_Generic := True;
9008 Expander_Mode_Save_And_Set (False);
9015 procedure Switch_View (T : Entity_Id) is
9016 Priv_Elmt : Elmt_Id := No_Elmt;
9017 Priv_Sub : Entity_Id;
9018 BT : Entity_Id := Base_Type (T);
9021 -- T may be private but its base type may have been exchanged through
9022 -- some other occurrence, in which case there is nothing to switch.
9024 if not Is_Private_Type (BT) then
9028 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9030 if Present (Full_View (BT)) then
9031 Append_Elmt (Full_View (BT), Exchanged_Views);
9032 Exchange_Declarations (BT);
9035 while Present (Priv_Elmt) loop
9036 Priv_Sub := (Node (Priv_Elmt));
9038 -- We avoid flipping the subtype if the Etype of its full
9039 -- view is private because this would result in a malformed
9040 -- subtype. This occurs when the Etype of the subtype full
9041 -- view is the full view of the base type (and since the
9042 -- base types were just switched, the subtype is pointing
9043 -- to the wrong view). This is currently the case for
9044 -- tagged record types, access types (maybe more?) and
9045 -- needs to be resolved. ???
9047 if Present (Full_View (Priv_Sub))
9048 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
9050 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
9051 Exchange_Declarations (Priv_Sub);
9054 Next_Elmt (Priv_Elmt);
9058 -----------------------------
9059 -- Valid_Default_Attribute --
9060 -----------------------------
9062 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
9063 Attr_Id : constant Attribute_Id :=
9064 Get_Attribute_Id (Attribute_Name (Def));
9067 T : Entity_Id := Entity (Prefix (Def));
9069 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
9079 F := First_Formal (Nam);
9080 while Present (F) loop
9086 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
9087 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
9088 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
9089 Attribute_Unbiased_Rounding =>
9090 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
9092 when Attribute_Image | Attribute_Pred | Attribute_Succ |
9093 Attribute_Value | Attribute_Wide_Image |
9094 Attribute_Wide_Value =>
9095 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9097 when Attribute_Max | Attribute_Min =>
9098 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
9100 when Attribute_Input =>
9101 OK := (Is_Fun and then Num_F = 1);
9103 when Attribute_Output | Attribute_Read | Attribute_Write =>
9104 OK := (not Is_Fun and then Num_F = 2);
9106 when others => OK := False;
9110 Error_Msg_N ("attribute reference has wrong profile for subprogram",
9113 end Valid_Default_Attribute;