1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Rident; use Rident;
44 with Restrict; use Restrict;
45 with Rtsfind; use Rtsfind;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Ch10; use Sem_Ch10;
53 with Sem_Ch13; use Sem_Ch13;
54 with Sem_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 Sem_Warn; use Sem_Warn;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation (N : Node_Id);
245 pragma No_Return (Abandon_Instantiation);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T : in out Entity_Id;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part (N : Node_Id);
283 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
284 -- This needs comments ???
286 function Analyze_Associations
291 -- At instantiation time, build the list of associations between formals
292 -- and actuals. Each association becomes a renaming declaration for the
293 -- formal entity. F_Copy is the analyzed list of formals in the generic
294 -- copy. It is used to apply legality checks to the actuals. I_Node is the
295 -- instantiation node itself.
297 procedure Analyze_Subprogram_Instantiation
301 procedure Build_Instance_Compilation_Unit_Nodes
305 -- This procedure is used in the case where the generic instance of a
306 -- subprogram body or package body is a library unit. In this case, the
307 -- original library unit node for the generic instantiation must be
308 -- replaced by the resulting generic body, and a link made to a new
309 -- compilation unit node for the generic declaration. The argument N is
310 -- the original generic instantiation. Act_Body and Act_Decl are the body
311 -- and declaration of the instance (either package body and declaration
312 -- nodes or subprogram body and declaration nodes depending on the case).
313 -- On return, the node N has been rewritten with the actual body.
315 procedure Check_Formal_Packages (P_Id : Entity_Id);
316 -- Apply the following to all formal packages in generic associations.
318 procedure Check_Formal_Package_Instance
319 (Formal_Pack : Entity_Id;
320 Actual_Pack : Entity_Id);
321 -- Verify that the actuals of the actual instance match the actuals of
322 -- the template for a formal package that is not declared with a box.
324 procedure Check_Forward_Instantiation (Decl : Node_Id);
325 -- If the generic is a local entity and the corresponding body has not
326 -- been seen yet, flag enclosing packages to indicate that it will be
327 -- elaborated after the generic body. Subprograms declared in the same
328 -- package cannot be inlined by the front-end because front-end inlining
329 -- requires a strict linear order of elaboration.
331 procedure Check_Hidden_Child_Unit
333 Gen_Unit : Entity_Id;
334 Act_Decl_Id : Entity_Id);
335 -- If the generic unit is an implicit child instance within a parent
336 -- instance, we need to make an explicit test that it is not hidden by
337 -- a child instance of the same name and parent.
339 procedure Check_Private_View (N : Node_Id);
340 -- Check whether the type of a generic entity has a different view between
341 -- the point of generic analysis and the point of instantiation. If the
342 -- view has changed, then at the point of instantiation we restore the
343 -- correct view to perform semantic analysis of the instance, and reset
344 -- the current view after instantiation. The processing is driven by the
345 -- current private status of the type of the node, and Has_Private_View,
346 -- a flag that is set at the point of generic compilation. If view and
347 -- flag are inconsistent then the type is updated appropriately.
349 procedure Check_Generic_Actuals
350 (Instance : Entity_Id;
351 Is_Formal_Box : Boolean);
352 -- Similar to previous one. Check the actuals in the instantiation,
353 -- whose views can change between the point of instantiation and the point
354 -- of instantiation of the body. In addition, mark the generic renamings
355 -- as generic actuals, so that they are not compatible with other actuals.
356 -- Recurse on an actual that is a formal package whose declaration has
359 function Contains_Instance_Of
364 -- Inner is instantiated within the generic Outer. Check whether Inner
365 -- directly or indirectly contains an instance of Outer or of one of its
366 -- parents, in the case of a subunit. Each generic unit holds a list of
367 -- the entities instantiated within (at any depth). This procedure
368 -- determines whether the set of such lists contains a cycle, i.e. an
369 -- illegal circular instantiation.
371 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. Used in
374 -- Restore_Private_Views, to keep the formals of such a package visible
375 -- on exit from an inner instantiation.
377 function Find_Actual_Type
379 Gen_Scope : Entity_Id)
381 -- When validating the actual types of a child instance, check whether
382 -- the formal is a formal type of the parent unit, and retrieve the current
383 -- actual for it. Typ is the entity in the analyzed formal type declaration
384 -- (component or index type of an array type) and Gen_Scope is the scope of
385 -- the analyzed formal array type.
387 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
388 -- Given the entity of a unit that is an instantiation, retrieve the
389 -- original instance node. This is used when loading the instantiations
390 -- of the ancestors of a child generic that is being instantiated.
392 function In_Same_Declarative_Part
396 -- True if the instantiation Inst and the given freeze_node F_Node appear
397 -- within the same declarative part, ignoring subunits, but with no inter-
398 -- vening suprograms or concurrent units. If true, the freeze node
399 -- of the instance can be placed after the freeze node of the parent,
400 -- which it itself an instance.
402 procedure Set_Instance_Env
403 (Gen_Unit : Entity_Id;
404 Act_Unit : Entity_Id);
405 -- Save current instance on saved environment, to be used to determine
406 -- the global status of entities in nested instances. Part of Save_Env.
407 -- called after verifying that the generic unit is legal for the instance.
409 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
410 -- Associate analyzed generic parameter with corresponding
411 -- instance. Used for semantic checks at instantiation time.
413 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
414 -- Traverse the Exchanged_Views list to see if a type was private
415 -- and has already been flipped during this phase of instantiation.
417 procedure Hide_Current_Scope;
418 -- When compiling a generic child unit, the parent context must be
419 -- present, but the instance and all entities that may be generated
420 -- must be inserted in the current scope. We leave the current scope
421 -- on the stack, but make its entities invisible to avoid visibility
422 -- problems. This is reversed at the end of instantiations. This is
423 -- not done for the instantiation of the bodies, which only require the
424 -- instances of the generic parents to be in scope.
426 procedure Install_Body
431 -- If the instantiation happens textually before the body of the generic,
432 -- the instantiation of the body must be analyzed after the generic body,
433 -- and not at the point of instantiation. Such early instantiations can
434 -- happen if the generic and the instance appear in a package declaration
435 -- because the generic body can only appear in the corresponding package
436 -- body. Early instantiations can also appear if generic, instance and
437 -- body are all in the declarative part of a subprogram or entry. Entities
438 -- of packages that are early instantiations are delayed, and their freeze
439 -- node appears after the generic body.
441 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
442 -- Insert freeze node at the end of the declarative part that includes the
443 -- instance node N. If N is in the visible part of an enclosing package
444 -- declaration, the freeze node has to be inserted at the end of the
445 -- private declarations, if any.
447 procedure Freeze_Subprogram_Body
448 (Inst_Node : Node_Id;
450 Pack_Id : Entity_Id);
451 -- The generic body may appear textually after the instance, including
452 -- in the proper body of a stub, or within a different package instance.
453 -- Given that the instance can only be elaborated after the generic, we
454 -- place freeze_nodes for the instance and/or for packages that may enclose
455 -- the instance and the generic, so that the back-end can establish the
456 -- proper order of elaboration.
459 -- Establish environment for subsequent instantiation. Separated from
460 -- Save_Env because data-structures for visibility handling must be
461 -- initialized before call to Check_Generic_Child_Unit.
463 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
464 -- When compiling an instance of a child unit the parent (which is
465 -- itself an instance) is an enclosing scope that must be made
466 -- immediately visible. This procedure is also used to install the non-
467 -- generic parent of a generic child unit when compiling its body, so that
468 -- full views of types in the parent are made visible.
470 procedure Remove_Parent (In_Body : Boolean := False);
471 -- Reverse effect after instantiation of child is complete.
473 procedure Inline_Instance_Body
475 Gen_Unit : Entity_Id;
477 -- If front-end inlining is requested, instantiate the package body,
478 -- and preserve the visibility of its compilation unit, to insure
479 -- that successive instantiations succeed.
481 -- The functions Instantiate_XXX perform various legality checks and build
482 -- the declarations for instantiated generic parameters.
483 -- Need to describe what the parameters are ???
485 function Instantiate_Object
488 Analyzed_Formal : Node_Id)
491 function Instantiate_Type
494 Analyzed_Formal : Node_Id;
495 Actual_Decls : List_Id)
498 function Instantiate_Formal_Subprogram
501 Analyzed_Formal : Node_Id)
504 function Instantiate_Formal_Package
507 Analyzed_Formal : Node_Id)
509 -- If the formal package is declared with a box, special visibility rules
510 -- apply to its formals: they are in the visible part of the package. This
511 -- is true in the declarative region of the formal package, that is to say
512 -- in the enclosing generic or instantiation. For an instantiation, the
513 -- parameters of the formal package are made visible in an explicit step.
514 -- Furthermore, if the actual is a visible use_clause, these formals must
515 -- be made potentially use_visible as well. On exit from the enclosing
516 -- instantiation, the reverse must be done.
518 -- For a formal package declared without a box, there are conformance rules
519 -- that apply to the actuals in the generic declaration and the actuals of
520 -- the actual package in the enclosing instantiation. The simplest way to
521 -- apply these rules is to repeat the instantiation of the formal package
522 -- in the context of the enclosing instance, and compare the generic
523 -- associations of this instantiation with those of the actual package.
525 function Is_In_Main_Unit (N : Node_Id) return Boolean;
526 -- Test if given node is in the main unit
528 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
529 -- If the generic appears in a separate non-generic library unit,
530 -- load the corresponding body to retrieve the body of the generic.
531 -- N is the node for the generic instantiation, Spec is the generic
532 -- package declaration.
534 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
535 -- Add the context clause of the unit containing a generic unit to
536 -- an instantiation that is a compilation unit.
538 function Get_Associated_Node (N : Node_Id) return Node_Id;
539 -- In order to propagate semantic information back from the analyzed
540 -- copy to the original generic, we maintain links between selected nodes
541 -- in the generic and their corresponding copies. At the end of generic
542 -- analysis, the routine Save_Global_References traverses the generic
543 -- tree, examines the semantic information, and preserves the links to
544 -- those nodes that contain global information. At instantiation, the
545 -- information from the associated node is placed on the new copy, so
546 -- that name resolution is not repeated.
548 -- Three kinds of source nodes have associated nodes:
550 -- a) those that can reference (denote) entities, that is identifiers,
551 -- character literals, expanded_names, operator symbols, operators,
552 -- and attribute reference nodes. These nodes have an Entity field
553 -- and are the set of nodes that are in N_Has_Entity.
555 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
557 -- c) selected components (N_Selected_Component)
559 -- For the first class, the associated node preserves the entity if it is
560 -- global. If the generic contains nested instantiations, the associated
561 -- node itself has been recopied, and a chain of them must be followed.
563 -- For aggregates, the associated node allows retrieval of the type, which
564 -- may otherwise not appear in the generic. The view of this type may be
565 -- different between generic and instantiation, and the full view can be
566 -- installed before the instantiation is analyzed. For aggregates of
567 -- type extensions, the same view exchange may have to be performed for
568 -- some of the ancestor types, if their view is private at the point of
571 -- Nodes that are selected components in the parse tree may be rewritten
572 -- as expanded names after resolution, and must be treated as potential
573 -- entity holders. which is why they also have an Associated_Node.
575 -- Nodes that do not come from source, such as freeze nodes, do not appear
576 -- in the generic tree, and need not have an associated node.
578 -- The associated node is stored in the Associated_Node field. Note that
579 -- this field overlaps Entity, which is fine, because the whole point is
580 -- that we don't need or want the normal Entity field in this situation.
582 procedure Move_Freeze_Nodes
586 -- Freeze nodes can be generated in the analysis of a generic unit, but
587 -- will not be seen by the back-end. It is necessary to move those nodes
588 -- to the enclosing scope if they freeze an outer entity. We place them
589 -- at the end of the enclosing generic package, which is semantically
592 procedure Pre_Analyze_Actuals (N : Node_Id);
593 -- Analyze actuals to perform name resolution. Full resolution is done
594 -- later, when the expected types are known, but names have to be captured
595 -- before installing parents of generics, that are not visible for the
596 -- actuals themselves.
598 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
599 -- Verify that an attribute that appears as the default for a formal
600 -- subprogram is a function or procedure with the correct profile.
602 -------------------------------------------
603 -- Data Structures for Generic Renamings --
604 -------------------------------------------
606 -- The map Generic_Renamings associates generic entities with their
607 -- corresponding actuals. Currently used to validate type instances.
608 -- It will eventually be used for all generic parameters to eliminate
609 -- the need for overload resolution in the instance.
611 type Assoc_Ptr is new Int;
613 Assoc_Null : constant Assoc_Ptr := -1;
618 Next_In_HTable : Assoc_Ptr;
621 package Generic_Renamings is new Table.Table
622 (Table_Component_Type => Assoc,
623 Table_Index_Type => Assoc_Ptr,
624 Table_Low_Bound => 0,
626 Table_Increment => 100,
627 Table_Name => "Generic_Renamings");
629 -- Variable to hold enclosing instantiation. When the environment is
630 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
632 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
634 -- Hash table for associations
636 HTable_Size : constant := 37;
637 type HTable_Range is range 0 .. HTable_Size - 1;
639 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
640 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
641 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
642 function Hash (F : Entity_Id) return HTable_Range;
644 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
645 Header_Num => HTable_Range,
647 Elmt_Ptr => Assoc_Ptr,
648 Null_Ptr => Assoc_Null,
649 Set_Next => Set_Next_Assoc,
652 Get_Key => Get_Gen_Id,
656 Exchanged_Views : Elist_Id;
657 -- This list holds the private views that have been exchanged during
658 -- instantiation to restore the visibility of the generic declaration.
659 -- (see comments above). After instantiation, the current visibility is
660 -- reestablished by means of a traversal of this list.
662 Hidden_Entities : Elist_Id;
663 -- This list holds the entities of the current scope that are removed
664 -- from immediate visibility when instantiating a child unit. Their
665 -- visibility is restored in Remove_Parent.
667 -- Because instantiations can be recursive, the following must be saved
668 -- on entry and restored on exit from an instantiation (spec or body).
669 -- This is done by the two procedures Save_Env and Restore_Env. For
670 -- package and subprogram instantiations (but not for the body instances)
671 -- the action of Save_Env is done in two steps: Init_Env is called before
672 -- Check_Generic_Child_Unit, because setting the parent instances requires
673 -- that the visibility data structures be properly initialized. Once the
674 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
676 type Instance_Env is record
678 Instantiated_Parent : Assoc;
679 Exchanged_Views : Elist_Id;
680 Hidden_Entities : Elist_Id;
681 Current_Sem_Unit : Unit_Number_Type;
684 package Instance_Envs is new Table.Table (
685 Table_Component_Type => Instance_Env,
686 Table_Index_Type => Int,
687 Table_Low_Bound => 0,
689 Table_Increment => 100,
690 Table_Name => "Instance_Envs");
692 procedure Restore_Private_Views
693 (Pack_Id : Entity_Id;
694 Is_Package : Boolean := True);
695 -- Restore the private views of external types, and unmark the generic
696 -- renamings of actuals, so that they become comptible subtypes again.
697 -- For subprograms, Pack_Id is the package constructed to hold the
700 procedure Switch_View (T : Entity_Id);
701 -- Switch the partial and full views of a type and its private
702 -- dependents (i.e. its subtypes and derived types).
704 ------------------------------------
705 -- Structures for Error Reporting --
706 ------------------------------------
708 Instantiation_Node : Node_Id;
709 -- Used by subprograms that validate instantiation of formal parameters
710 -- where there might be no actual on which to place the error message.
711 -- Also used to locate the instantiation node for generic subunits.
713 Instantiation_Error : exception;
714 -- When there is a semantic error in the generic parameter matching,
715 -- there is no point in continuing the instantiation, because the
716 -- number of cascaded errors is unpredictable. This exception aborts
717 -- the instantiation process altogether.
719 S_Adjustment : Sloc_Adjustment;
720 -- Offset created for each node in an instantiation, in order to keep
721 -- track of the source position of the instantiation in each of its nodes.
722 -- A subsequent semantic error or warning on a construct of the instance
723 -- points to both places: the original generic node, and the point of
724 -- instantiation. See Sinput and Sinput.L for additional details.
726 ------------------------------------------------------------
727 -- Data structure for keeping track when inside a Generic --
728 ------------------------------------------------------------
730 -- The following table is used to save values of the Inside_A_Generic
731 -- flag (see spec of Sem) when they are saved by Start_Generic.
733 package Generic_Flags is new Table.Table (
734 Table_Component_Type => Boolean,
735 Table_Index_Type => Int,
736 Table_Low_Bound => 0,
738 Table_Increment => 200,
739 Table_Name => "Generic_Flags");
741 ---------------------------
742 -- Abandon_Instantiation --
743 ---------------------------
745 procedure Abandon_Instantiation (N : Node_Id) is
747 Error_Msg_N ("instantiation abandoned!", N);
748 raise Instantiation_Error;
749 end Abandon_Instantiation;
751 --------------------------
752 -- Analyze_Associations --
753 --------------------------
755 function Analyze_Associations
761 Actual_Types : constant Elist_Id := New_Elmt_List;
762 Assoc : constant List_Id := New_List;
763 Defaults : constant Elist_Id := New_Elmt_List;
764 Gen_Unit : constant Entity_Id := Defining_Entity
769 Next_Formal : Node_Id;
770 Temp_Formal : Node_Id;
771 Analyzed_Formal : Node_Id;
774 First_Named : Node_Id := Empty;
775 Found_Assoc : Node_Id;
776 Is_Named_Assoc : Boolean;
777 Num_Matched : Int := 0;
778 Num_Actuals : Int := 0;
780 function Matching_Actual
784 -- Find actual that corresponds to a given a formal parameter. If the
785 -- actuals are positional, return the next one, if any. If the actuals
786 -- are named, scan the parameter associations to find the right one.
787 -- A_F is the corresponding entity in the analyzed generic,which is
788 -- placed on the selector name for ASIS use.
790 procedure Set_Analyzed_Formal;
791 -- Find the node in the generic copy that corresponds to a given formal.
792 -- The semantic information on this node is used to perform legality
793 -- checks on the actuals. Because semantic analysis can introduce some
794 -- anonymous entities or modify the declaration node itself, the
795 -- correspondence between the two lists is not one-one. In addition to
796 -- anonymous types, the presence a formal equality will introduce an
797 -- implicit declaration for the corresponding inequality.
799 ---------------------
800 -- Matching_Actual --
801 ---------------------
803 function Matching_Actual
812 Is_Named_Assoc := False;
814 -- End of list of purely positional parameters
819 -- Case of positional parameter corresponding to current formal
821 elsif No (Selector_Name (Actual)) then
822 Found := Explicit_Generic_Actual_Parameter (Actual);
823 Found_Assoc := Actual;
824 Num_Matched := Num_Matched + 1;
827 -- Otherwise scan list of named actuals to find the one with the
828 -- desired name. All remaining actuals have explicit names.
831 Is_Named_Assoc := True;
835 while Present (Actual) loop
836 if Chars (Selector_Name (Actual)) = Chars (F) then
837 Found := Explicit_Generic_Actual_Parameter (Actual);
838 Set_Entity (Selector_Name (Actual), A_F);
839 Set_Etype (Selector_Name (Actual), Etype (A_F));
840 Generate_Reference (A_F, Selector_Name (Actual));
841 Found_Assoc := Actual;
842 Num_Matched := Num_Matched + 1;
850 -- Reset for subsequent searches. In most cases the named
851 -- associations are in order. If they are not, we reorder them
852 -- to avoid scanning twice the same actual. This is not just a
853 -- question of efficiency: there may be multiple defaults with
854 -- boxes that have the same name. In a nested instantiation we
855 -- insert actuals for those defaults, and cannot rely on their
856 -- names to disambiguate them.
858 if Actual = First_Named then
861 elsif Present (Actual) then
862 Insert_Before (First_Named, Remove_Next (Prev));
865 Actual := First_Named;
871 -------------------------
872 -- Set_Analyzed_Formal --
873 -------------------------
875 procedure Set_Analyzed_Formal is
878 while Present (Analyzed_Formal) loop
879 Kind := Nkind (Analyzed_Formal);
881 case Nkind (Formal) is
883 when N_Formal_Subprogram_Declaration =>
884 exit when Kind = N_Formal_Subprogram_Declaration
887 (Defining_Unit_Name (Specification (Formal))) =
889 (Defining_Unit_Name (Specification (Analyzed_Formal)));
891 when N_Formal_Package_Declaration =>
893 Kind = N_Formal_Package_Declaration
895 Kind = N_Generic_Package_Declaration;
897 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
901 -- Skip freeze nodes, and nodes inserted to replace
902 -- unrecognized pragmas.
905 Kind /= N_Formal_Subprogram_Declaration
906 and then Kind /= N_Subprogram_Declaration
907 and then Kind /= N_Freeze_Entity
908 and then Kind /= N_Null_Statement
909 and then Kind /= N_Itype_Reference
910 and then Chars (Defining_Identifier (Formal)) =
911 Chars (Defining_Identifier (Analyzed_Formal));
914 Next (Analyzed_Formal);
917 end Set_Analyzed_Formal;
919 -- Start of processing for Analyze_Associations
922 -- If named associations are present, save the first named association
923 -- (it may of course be Empty) to facilitate subsequent name search.
925 Actuals := Generic_Associations (I_Node);
927 if Present (Actuals) then
928 First_Named := First (Actuals);
930 while Present (First_Named)
931 and then No (Selector_Name (First_Named))
933 Num_Actuals := Num_Actuals + 1;
938 Named := First_Named;
939 while Present (Named) loop
940 if No (Selector_Name (Named)) then
941 Error_Msg_N ("invalid positional actual after named one", Named);
942 Abandon_Instantiation (Named);
945 -- A named association may lack an actual parameter, if it was
946 -- introduced for a default subprogram that turns out to be local
947 -- to the outer instantiation.
949 if Present (Explicit_Generic_Actual_Parameter (Named)) then
950 Num_Actuals := Num_Actuals + 1;
956 if Present (Formals) then
957 Formal := First_Non_Pragma (Formals);
958 Analyzed_Formal := First_Non_Pragma (F_Copy);
960 if Present (Actuals) then
961 Actual := First (Actuals);
963 -- All formals should have default values
969 while Present (Formal) loop
971 Next_Formal := Next_Non_Pragma (Formal);
973 case Nkind (Formal) is
974 when N_Formal_Object_Declaration =>
977 Defining_Identifier (Formal),
978 Defining_Identifier (Analyzed_Formal));
981 (Instantiate_Object (Formal, Match, Analyzed_Formal),
984 when N_Formal_Type_Declaration =>
987 Defining_Identifier (Formal),
988 Defining_Identifier (Analyzed_Formal));
991 Error_Msg_Sloc := Sloc (Gen_Unit);
994 Instantiation_Node, Defining_Identifier (Formal));
995 Error_Msg_NE ("\in instantiation of & declared#",
996 Instantiation_Node, Gen_Unit);
997 Abandon_Instantiation (Instantiation_Node);
1003 (Formal, Match, Analyzed_Formal, Assoc));
1005 -- an instantiation is a freeze point for the actuals,
1006 -- unless this is a rewritten formal package.
1008 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1009 Append_Elmt (Entity (Match), Actual_Types);
1013 -- A remote access-to-class-wide type must not be an
1014 -- actual parameter for a generic formal of an access
1015 -- type (E.2.2 (17)).
1017 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1019 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1020 N_Access_To_Object_Definition
1022 Validate_Remote_Access_To_Class_Wide_Type (Match);
1025 when N_Formal_Subprogram_Declaration =>
1028 Defining_Unit_Name (Specification (Formal)),
1029 Defining_Unit_Name (Specification (Analyzed_Formal)));
1031 -- If the formal subprogram has the same name as
1032 -- another formal subprogram of the generic, then
1033 -- a named association is illegal (12.3(9)). Exclude
1034 -- named associations that are generated for a nested
1038 and then Is_Named_Assoc
1039 and then Comes_From_Source (Found_Assoc)
1041 Temp_Formal := First (Formals);
1042 while Present (Temp_Formal) loop
1043 if Nkind (Temp_Formal) =
1044 N_Formal_Subprogram_Declaration
1045 and then Temp_Formal /= Formal
1047 Chars (Selector_Name (Found_Assoc)) =
1048 Chars (Defining_Unit_Name
1049 (Specification (Temp_Formal)))
1052 ("name not allowed for overloaded formal",
1054 Abandon_Instantiation (Instantiation_Node);
1062 Instantiate_Formal_Subprogram
1063 (Formal, Match, Analyzed_Formal));
1066 and then Box_Present (Formal)
1069 (Defining_Unit_Name (Specification (Last (Assoc))),
1073 when N_Formal_Package_Declaration =>
1076 Defining_Identifier (Formal),
1077 Defining_Identifier (Original_Node (Analyzed_Formal)));
1080 Error_Msg_Sloc := Sloc (Gen_Unit);
1083 Instantiation_Node, Defining_Identifier (Formal));
1084 Error_Msg_NE ("\in instantiation of & declared#",
1085 Instantiation_Node, Gen_Unit);
1087 Abandon_Instantiation (Instantiation_Node);
1092 (Instantiate_Formal_Package
1093 (Formal, Match, Analyzed_Formal),
1097 -- For use type and use package appearing in the context
1098 -- clause, we have already copied them, so we can just
1099 -- move them where they belong (we mustn't recopy them
1100 -- since this would mess up the Sloc values).
1102 when N_Use_Package_Clause |
1103 N_Use_Type_Clause =>
1105 Append (Formal, Assoc);
1108 raise Program_Error;
1112 Formal := Next_Formal;
1113 Next_Non_Pragma (Analyzed_Formal);
1116 if Num_Actuals > Num_Matched then
1117 Error_Msg_Sloc := Sloc (Gen_Unit);
1119 if Present (Selector_Name (Actual)) then
1121 ("unmatched actual&",
1122 Actual, Selector_Name (Actual));
1123 Error_Msg_NE ("\in instantiation of& declared#",
1127 ("unmatched actual in instantiation of& declared#",
1132 elsif Present (Actuals) then
1134 ("too many actuals in generic instantiation", Instantiation_Node);
1138 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1141 while Present (Elmt) loop
1142 Freeze_Before (I_Node, Node (Elmt));
1147 -- If there are default subprograms, normalize the tree by adding
1148 -- explicit associations for them. This is required if the instance
1149 -- appears within a generic.
1157 Elmt := First_Elmt (Defaults);
1158 while Present (Elmt) loop
1159 if No (Actuals) then
1160 Actuals := New_List;
1161 Set_Generic_Associations (I_Node, Actuals);
1164 Subp := Node (Elmt);
1166 Make_Generic_Association (Sloc (Subp),
1167 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1168 Explicit_Generic_Actual_Parameter =>
1169 New_Occurrence_Of (Subp, Sloc (Subp)));
1170 Mark_Rewrite_Insertion (New_D);
1171 Append_To (Actuals, New_D);
1177 end Analyze_Associations;
1179 -------------------------------
1180 -- Analyze_Formal_Array_Type --
1181 -------------------------------
1183 procedure Analyze_Formal_Array_Type
1184 (T : in out Entity_Id;
1190 -- Treated like a non-generic array declaration, with
1191 -- additional semantic checks.
1195 if Nkind (Def) = N_Constrained_Array_Definition then
1196 DSS := First (Discrete_Subtype_Definitions (Def));
1197 while Present (DSS) loop
1198 if Nkind (DSS) = N_Subtype_Indication
1199 or else Nkind (DSS) = N_Range
1200 or else Nkind (DSS) = N_Attribute_Reference
1202 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1209 Array_Type_Declaration (T, Def);
1210 Set_Is_Generic_Type (Base_Type (T));
1212 if Ekind (Component_Type (T)) = E_Incomplete_Type
1213 and then No (Full_View (Component_Type (T)))
1215 Error_Msg_N ("premature usage of incomplete type", Def);
1217 elsif Is_Internal (Component_Type (T))
1218 and then Nkind (Original_Node
1219 (Subtype_Indication (Component_Definition (Def))))
1220 /= N_Attribute_Reference
1223 ("only a subtype mark is allowed in a formal",
1224 Subtype_Indication (Component_Definition (Def)));
1227 end Analyze_Formal_Array_Type;
1229 ---------------------------------------------
1230 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1231 ---------------------------------------------
1233 -- As for other generic types, we create a valid type representation
1234 -- with legal but arbitrary attributes, whose values are never considered
1235 -- static. For all scalar types we introduce an anonymous base type, with
1236 -- the same attributes. We choose the corresponding integer type to be
1237 -- Standard_Integer.
1239 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1243 Loc : constant Source_Ptr := Sloc (Def);
1244 Base : constant Entity_Id :=
1246 (E_Decimal_Fixed_Point_Type,
1247 Current_Scope, Sloc (Def), 'G');
1248 Int_Base : constant Entity_Id := Standard_Integer;
1249 Delta_Val : constant Ureal := Ureal_1;
1250 Digs_Val : constant Uint := Uint_6;
1255 Set_Etype (Base, Base);
1256 Set_Size_Info (Base, Int_Base);
1257 Set_RM_Size (Base, RM_Size (Int_Base));
1258 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1259 Set_Digits_Value (Base, Digs_Val);
1260 Set_Delta_Value (Base, Delta_Val);
1261 Set_Small_Value (Base, Delta_Val);
1262 Set_Scalar_Range (Base,
1264 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1265 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1267 Set_Is_Generic_Type (Base);
1268 Set_Parent (Base, Parent (Def));
1270 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1271 Set_Etype (T, Base);
1272 Set_Size_Info (T, Int_Base);
1273 Set_RM_Size (T, RM_Size (Int_Base));
1274 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1275 Set_Digits_Value (T, Digs_Val);
1276 Set_Delta_Value (T, Delta_Val);
1277 Set_Small_Value (T, Delta_Val);
1278 Set_Scalar_Range (T, Scalar_Range (Base));
1280 Check_Restriction (No_Fixed_Point, Def);
1281 end Analyze_Formal_Decimal_Fixed_Point_Type;
1283 ---------------------------------
1284 -- Analyze_Formal_Derived_Type --
1285 ---------------------------------
1287 procedure Analyze_Formal_Derived_Type
1292 Loc : constant Source_Ptr := Sloc (Def);
1293 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1297 Set_Is_Generic_Type (T);
1299 if Private_Present (Def) then
1301 Make_Private_Extension_Declaration (Loc,
1302 Defining_Identifier => T,
1303 Discriminant_Specifications => Discriminant_Specifications (N),
1304 Unknown_Discriminants_Present => Unk_Disc,
1305 Subtype_Indication => Subtype_Mark (Def));
1307 Set_Abstract_Present (New_N, Abstract_Present (Def));
1311 Make_Full_Type_Declaration (Loc,
1312 Defining_Identifier => T,
1313 Discriminant_Specifications =>
1314 Discriminant_Specifications (Parent (T)),
1316 Make_Derived_Type_Definition (Loc,
1317 Subtype_Indication => Subtype_Mark (Def)));
1319 Set_Abstract_Present
1320 (Type_Definition (New_N), Abstract_Present (Def));
1327 if not Is_Composite_Type (T) then
1329 ("unknown discriminants not allowed for elementary types", N);
1331 Set_Has_Unknown_Discriminants (T);
1332 Set_Is_Constrained (T, False);
1336 -- If the parent type has a known size, so does the formal, which
1337 -- makes legal representation clauses that involve the formal.
1339 Set_Size_Known_At_Compile_Time
1340 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1342 end Analyze_Formal_Derived_Type;
1344 ----------------------------------
1345 -- Analyze_Formal_Discrete_Type --
1346 ----------------------------------
1348 -- The operations defined for a discrete types are those of an
1349 -- enumeration type. The size is set to an arbitrary value, for use
1350 -- in analyzing the generic unit.
1352 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1353 Loc : constant Source_Ptr := Sloc (Def);
1359 Set_Ekind (T, E_Enumeration_Type);
1364 -- For semantic analysis, the bounds of the type must be set to some
1365 -- non-static value. The simplest is to create attribute nodes for
1366 -- those bounds, that refer to the type itself. These bounds are never
1367 -- analyzed but serve as place-holders.
1370 Make_Attribute_Reference (Loc,
1371 Attribute_Name => Name_First,
1372 Prefix => New_Reference_To (T, Loc));
1376 Make_Attribute_Reference (Loc,
1377 Attribute_Name => Name_Last,
1378 Prefix => New_Reference_To (T, Loc));
1381 Set_Scalar_Range (T,
1386 end Analyze_Formal_Discrete_Type;
1388 ----------------------------------
1389 -- Analyze_Formal_Floating_Type --
1390 ---------------------------------
1392 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1393 Base : constant Entity_Id :=
1395 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1398 -- The various semantic attributes are taken from the predefined type
1399 -- Float, just so that all of them are initialized. Their values are
1400 -- never used because no constant folding or expansion takes place in
1401 -- the generic itself.
1404 Set_Ekind (T, E_Floating_Point_Subtype);
1405 Set_Etype (T, Base);
1406 Set_Size_Info (T, (Standard_Float));
1407 Set_RM_Size (T, RM_Size (Standard_Float));
1408 Set_Digits_Value (T, Digits_Value (Standard_Float));
1409 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1411 Set_Is_Generic_Type (Base);
1412 Set_Etype (Base, Base);
1413 Set_Size_Info (Base, (Standard_Float));
1414 Set_RM_Size (Base, RM_Size (Standard_Float));
1415 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1416 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1417 Set_Parent (Base, Parent (Def));
1419 Check_Restriction (No_Floating_Point, Def);
1420 end Analyze_Formal_Floating_Type;
1422 ---------------------------------
1423 -- Analyze_Formal_Modular_Type --
1424 ---------------------------------
1426 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1428 -- Apart from their entity kind, generic modular types are treated
1429 -- like signed integer types, and have the same attributes.
1431 Analyze_Formal_Signed_Integer_Type (T, Def);
1432 Set_Ekind (T, E_Modular_Integer_Subtype);
1433 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1435 end Analyze_Formal_Modular_Type;
1437 ---------------------------------------
1438 -- Analyze_Formal_Object_Declaration --
1439 ---------------------------------------
1441 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1442 E : constant Node_Id := Expression (N);
1443 Id : constant Node_Id := Defining_Identifier (N);
1450 -- Determine the mode of the formal object
1452 if Out_Present (N) then
1453 K := E_Generic_In_Out_Parameter;
1455 if not In_Present (N) then
1456 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1460 K := E_Generic_In_Parameter;
1463 Find_Type (Subtype_Mark (N));
1464 T := Entity (Subtype_Mark (N));
1466 if Ekind (T) = E_Incomplete_Type then
1467 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1470 if K = E_Generic_In_Parameter then
1472 -- Ada 0Y (AI-287): Limited aggregates allowed in generic formals
1474 if not Extensions_Allowed and then Is_Limited_Type (T) then
1476 ("generic formal of mode IN must not be of limited type", N);
1477 Explain_Limited_Type (T, N);
1480 if Is_Abstract (T) then
1482 ("generic formal of mode IN must not be of abstract type", N);
1486 Analyze_Per_Use_Expression (E, T);
1492 -- Case of generic IN OUT parameter.
1495 -- If the formal has an unconstrained type, construct its
1496 -- actual subtype, as is done for subprogram formals. In this
1497 -- fashion, all its uses can refer to specific bounds.
1502 if (Is_Array_Type (T)
1503 and then not Is_Constrained (T))
1505 (Ekind (T) = E_Record_Type
1506 and then Has_Discriminants (T))
1509 Non_Freezing_Ref : constant Node_Id :=
1510 New_Reference_To (Id, Sloc (Id));
1514 -- Make sure that the actual subtype doesn't generate
1517 Set_Must_Not_Freeze (Non_Freezing_Ref);
1518 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1519 Insert_Before_And_Analyze (N, Decl);
1520 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1523 Set_Actual_Subtype (Id, T);
1528 ("initialization not allowed for `IN OUT` formals", N);
1532 end Analyze_Formal_Object_Declaration;
1534 ----------------------------------------------
1535 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1536 ----------------------------------------------
1538 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1542 Loc : constant Source_Ptr := Sloc (Def);
1543 Base : constant Entity_Id :=
1545 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1547 -- The semantic attributes are set for completeness only, their
1548 -- values will never be used, because all properties of the type
1552 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1553 Set_Etype (T, Base);
1554 Set_Size_Info (T, Standard_Integer);
1555 Set_RM_Size (T, RM_Size (Standard_Integer));
1556 Set_Small_Value (T, Ureal_1);
1557 Set_Delta_Value (T, Ureal_1);
1558 Set_Scalar_Range (T,
1560 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1561 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1563 Set_Is_Generic_Type (Base);
1564 Set_Etype (Base, Base);
1565 Set_Size_Info (Base, Standard_Integer);
1566 Set_RM_Size (Base, RM_Size (Standard_Integer));
1567 Set_Small_Value (Base, Ureal_1);
1568 Set_Delta_Value (Base, Ureal_1);
1569 Set_Scalar_Range (Base, Scalar_Range (T));
1570 Set_Parent (Base, Parent (Def));
1572 Check_Restriction (No_Fixed_Point, Def);
1573 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1575 ----------------------------
1576 -- Analyze_Formal_Package --
1577 ----------------------------
1579 procedure Analyze_Formal_Package (N : Node_Id) is
1580 Loc : constant Source_Ptr := Sloc (N);
1581 Formal : constant Entity_Id := Defining_Identifier (N);
1582 Gen_Id : constant Node_Id := Name (N);
1584 Gen_Unit : Entity_Id;
1586 Parent_Installed : Boolean := False;
1588 Parent_Instance : Entity_Id;
1589 Renaming_In_Par : Entity_Id;
1592 Text_IO_Kludge (Gen_Id);
1595 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1596 Gen_Unit := Entity (Gen_Id);
1598 if Ekind (Gen_Unit) /= E_Generic_Package then
1599 Error_Msg_N ("expect generic package name", Gen_Id);
1603 elsif Gen_Unit = Current_Scope then
1605 ("generic package cannot be used as a formal package of itself",
1610 elsif In_Open_Scopes (Gen_Unit) then
1611 if Is_Compilation_Unit (Gen_Unit)
1612 and then Is_Child_Unit (Current_Scope)
1614 -- Special-case the error when the formal is a parent, and
1615 -- continue analysis to minimize cascaded errors.
1618 ("generic parent cannot be used as formal package "
1619 & "of a child unit",
1624 ("generic package cannot be used as a formal package "
1632 -- Check for a formal package that is a package renaming.
1634 if Present (Renamed_Object (Gen_Unit)) then
1635 Gen_Unit := Renamed_Object (Gen_Unit);
1638 -- The formal package is treated like a regular instance, but only
1639 -- the specification needs to be instantiated, to make entities visible.
1641 if not Box_Present (N) then
1642 Hidden_Entities := New_Elmt_List;
1643 Analyze_Package_Instantiation (N);
1645 if Parent_Installed then
1650 -- If there are no generic associations, the generic parameters
1651 -- appear as local entities and are instantiated like them. We copy
1652 -- the generic package declaration as if it were an instantiation,
1653 -- and analyze it like a regular package, except that we treat the
1654 -- formals as additional visible components.
1656 Set_Instance_Env (Gen_Unit, Formal);
1658 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1660 if In_Extended_Main_Source_Unit (N) then
1661 Set_Is_Instantiated (Gen_Unit);
1662 Generate_Reference (Gen_Unit, N);
1667 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1668 Set_Defining_Unit_Name (Specification (New_N), Formal);
1671 Enter_Name (Formal);
1672 Set_Ekind (Formal, E_Generic_Package);
1673 Set_Etype (Formal, Standard_Void_Type);
1674 Set_Inner_Instances (Formal, New_Elmt_List);
1677 -- Within the formal, the name of the generic package is a renaming
1678 -- of the formal (as for a regular instantiation).
1680 Renaming := Make_Package_Renaming_Declaration (Loc,
1681 Defining_Unit_Name =>
1682 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1683 Name => New_Reference_To (Formal, Loc));
1685 if Present (Visible_Declarations (Specification (N))) then
1686 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1687 elsif Present (Private_Declarations (Specification (N))) then
1688 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1691 if Is_Child_Unit (Gen_Unit)
1692 and then Parent_Installed
1694 -- Similarly, we have to make the name of the formal visible in
1695 -- the parent instance, to resolve properly fully qualified names
1696 -- that may appear in the generic unit. The parent instance has
1697 -- been placed on the scope stack ahead of the current scope.
1699 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1702 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1703 Set_Ekind (Renaming_In_Par, E_Package);
1704 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1705 Set_Scope (Renaming_In_Par, Parent_Instance);
1706 Set_Parent (Renaming_In_Par, Parent (Formal));
1707 Set_Renamed_Object (Renaming_In_Par, Formal);
1708 Append_Entity (Renaming_In_Par, Parent_Instance);
1711 Analyze_Generic_Formal_Part (N);
1712 Analyze (Specification (N));
1713 End_Package_Scope (Formal);
1715 if Parent_Installed then
1721 -- Inside the generic unit, the formal package is a regular
1722 -- package, but no body is needed for it. Note that after
1723 -- instantiation, the defining_unit_name we need is in the
1724 -- new tree and not in the original. (see Package_Instantiation).
1725 -- A generic formal package is an instance, and can be used as
1726 -- an actual for an inner instance. Mark its generic parent.
1728 Set_Ekind (Formal, E_Package);
1729 Set_Generic_Parent (Specification (N), Gen_Unit);
1730 Set_Has_Completion (Formal, True);
1732 end Analyze_Formal_Package;
1734 ---------------------------------
1735 -- Analyze_Formal_Private_Type --
1736 ---------------------------------
1738 procedure Analyze_Formal_Private_Type
1744 New_Private_Type (N, T, Def);
1746 -- Set the size to an arbitrary but legal value.
1748 Set_Size_Info (T, Standard_Integer);
1749 Set_RM_Size (T, RM_Size (Standard_Integer));
1750 end Analyze_Formal_Private_Type;
1752 ----------------------------------------
1753 -- Analyze_Formal_Signed_Integer_Type --
1754 ----------------------------------------
1756 procedure Analyze_Formal_Signed_Integer_Type
1760 Base : constant Entity_Id :=
1762 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1767 Set_Ekind (T, E_Signed_Integer_Subtype);
1768 Set_Etype (T, Base);
1769 Set_Size_Info (T, Standard_Integer);
1770 Set_RM_Size (T, RM_Size (Standard_Integer));
1771 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1773 Set_Is_Generic_Type (Base);
1774 Set_Size_Info (Base, Standard_Integer);
1775 Set_RM_Size (Base, RM_Size (Standard_Integer));
1776 Set_Etype (Base, Base);
1777 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1778 Set_Parent (Base, Parent (Def));
1779 end Analyze_Formal_Signed_Integer_Type;
1781 -------------------------------
1782 -- Analyze_Formal_Subprogram --
1783 -------------------------------
1785 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1786 Spec : constant Node_Id := Specification (N);
1787 Def : constant Node_Id := Default_Name (N);
1788 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1796 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1797 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1801 Analyze_Subprogram_Declaration (N);
1802 Set_Is_Formal_Subprogram (Nam);
1803 Set_Has_Completion (Nam);
1805 -- Default name is resolved at the point of instantiation
1807 if Box_Present (N) then
1810 -- Else default is bound at the point of generic declaration
1812 elsif Present (Def) then
1813 if Nkind (Def) = N_Operator_Symbol then
1814 Find_Direct_Name (Def);
1816 elsif Nkind (Def) /= N_Attribute_Reference then
1820 -- For an attribute reference, analyze the prefix and verify
1821 -- that it has the proper profile for the subprogram.
1823 Analyze (Prefix (Def));
1824 Valid_Default_Attribute (Nam, Def);
1828 -- Default name may be overloaded, in which case the interpretation
1829 -- with the correct profile must be selected, as for a renaming.
1831 if Etype (Def) = Any_Type then
1834 elsif Nkind (Def) = N_Selected_Component then
1835 Subp := Entity (Selector_Name (Def));
1837 if Ekind (Subp) /= E_Entry then
1838 Error_Msg_N ("expect valid subprogram name as default", Def);
1842 elsif Nkind (Def) = N_Indexed_Component then
1844 if Nkind (Prefix (Def)) /= N_Selected_Component then
1845 Error_Msg_N ("expect valid subprogram name as default", Def);
1849 Subp := Entity (Selector_Name (Prefix (Def)));
1851 if Ekind (Subp) /= E_Entry_Family then
1852 Error_Msg_N ("expect valid subprogram name as default", Def);
1857 elsif Nkind (Def) = N_Character_Literal then
1859 -- Needs some type checks: subprogram should be parameterless???
1861 Resolve (Def, (Etype (Nam)));
1863 elsif not Is_Entity_Name (Def)
1864 or else not Is_Overloadable (Entity (Def))
1866 Error_Msg_N ("expect valid subprogram name as default", Def);
1869 elsif not Is_Overloaded (Def) then
1870 Subp := Entity (Def);
1873 Error_Msg_N ("premature usage of formal subprogram", Def);
1875 elsif not Entity_Matches_Spec (Subp, Nam) then
1876 Error_Msg_N ("no visible entity matches specification", Def);
1882 I1 : Interp_Index := 0;
1888 Get_First_Interp (Def, I, It);
1889 while Present (It.Nam) loop
1891 if Entity_Matches_Spec (It.Nam, Nam) then
1892 if Subp /= Any_Id then
1893 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1895 if It1 = No_Interp then
1896 Error_Msg_N ("ambiguous default subprogram", Def);
1909 Get_Next_Interp (I, It);
1913 if Subp /= Any_Id then
1914 Set_Entity (Def, Subp);
1917 Error_Msg_N ("premature usage of formal subprogram", Def);
1919 elsif Ekind (Subp) /= E_Operator then
1920 Check_Mode_Conformant (Subp, Nam);
1924 Error_Msg_N ("no visible subprogram matches specification", N);
1928 end Analyze_Formal_Subprogram;
1930 -------------------------------------
1931 -- Analyze_Formal_Type_Declaration --
1932 -------------------------------------
1934 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1935 Def : constant Node_Id := Formal_Type_Definition (N);
1939 T := Defining_Identifier (N);
1941 if Present (Discriminant_Specifications (N))
1942 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1945 ("discriminants not allowed for this formal type",
1946 Defining_Identifier (First (Discriminant_Specifications (N))));
1949 -- Enter the new name, and branch to specific routine.
1952 when N_Formal_Private_Type_Definition =>
1953 Analyze_Formal_Private_Type (N, T, Def);
1955 when N_Formal_Derived_Type_Definition =>
1956 Analyze_Formal_Derived_Type (N, T, Def);
1958 when N_Formal_Discrete_Type_Definition =>
1959 Analyze_Formal_Discrete_Type (T, Def);
1961 when N_Formal_Signed_Integer_Type_Definition =>
1962 Analyze_Formal_Signed_Integer_Type (T, Def);
1964 when N_Formal_Modular_Type_Definition =>
1965 Analyze_Formal_Modular_Type (T, Def);
1967 when N_Formal_Floating_Point_Definition =>
1968 Analyze_Formal_Floating_Type (T, Def);
1970 when N_Formal_Ordinary_Fixed_Point_Definition =>
1971 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1973 when N_Formal_Decimal_Fixed_Point_Definition =>
1974 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1976 when N_Array_Type_Definition =>
1977 Analyze_Formal_Array_Type (T, Def);
1979 when N_Access_To_Object_Definition |
1980 N_Access_Function_Definition |
1981 N_Access_Procedure_Definition =>
1982 Analyze_Generic_Access_Type (T, Def);
1988 raise Program_Error;
1992 Set_Is_Generic_Type (T);
1993 end Analyze_Formal_Type_Declaration;
1995 ------------------------------------
1996 -- Analyze_Function_Instantiation --
1997 ------------------------------------
1999 procedure Analyze_Function_Instantiation (N : Node_Id) is
2001 Analyze_Subprogram_Instantiation (N, E_Function);
2002 end Analyze_Function_Instantiation;
2004 ---------------------------------
2005 -- Analyze_Generic_Access_Type --
2006 ---------------------------------
2008 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2012 if Nkind (Def) = N_Access_To_Object_Definition then
2013 Access_Type_Declaration (T, Def);
2015 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2016 and then No (Full_View (Designated_Type (T)))
2017 and then not Is_Generic_Type (Designated_Type (T))
2019 Error_Msg_N ("premature usage of incomplete type", Def);
2021 elsif Is_Internal (Designated_Type (T)) then
2023 ("only a subtype mark is allowed in a formal", Def);
2027 Access_Subprogram_Declaration (T, Def);
2029 end Analyze_Generic_Access_Type;
2031 ---------------------------------
2032 -- Analyze_Generic_Formal_Part --
2033 ---------------------------------
2035 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2036 Gen_Parm_Decl : Node_Id;
2039 -- The generic formals are processed in the scope of the generic
2040 -- unit, where they are immediately visible. The scope is installed
2043 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2045 while Present (Gen_Parm_Decl) loop
2046 Analyze (Gen_Parm_Decl);
2047 Next (Gen_Parm_Decl);
2050 Generate_Reference_To_Generic_Formals (Current_Scope);
2051 end Analyze_Generic_Formal_Part;
2053 ------------------------------------------
2054 -- Analyze_Generic_Package_Declaration --
2055 ------------------------------------------
2057 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2058 Loc : constant Source_Ptr := Sloc (N);
2061 Save_Parent : Node_Id;
2063 Decls : constant List_Id :=
2064 Visible_Declarations (Specification (N));
2068 -- We introduce a renaming of the enclosing package, to have a usable
2069 -- entity as the prefix of an expanded name for a local entity of the
2070 -- form Par.P.Q, where P is the generic package. This is because a local
2071 -- entity named P may hide it, so that the usual visibility rules in
2072 -- the instance will not resolve properly.
2075 Make_Package_Renaming_Declaration (Loc,
2076 Defining_Unit_Name =>
2077 Make_Defining_Identifier (Loc,
2078 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2079 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2081 if Present (Decls) then
2082 Decl := First (Decls);
2083 while Present (Decl)
2084 and then Nkind (Decl) = N_Pragma
2089 if Present (Decl) then
2090 Insert_Before (Decl, Renaming);
2092 Append (Renaming, Visible_Declarations (Specification (N)));
2096 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2099 -- Create copy of generic unit, and save for instantiation.
2100 -- If the unit is a child unit, do not copy the specifications
2101 -- for the parent, which are not part of the generic tree.
2103 Save_Parent := Parent_Spec (N);
2104 Set_Parent_Spec (N, Empty);
2106 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2107 Set_Parent_Spec (New_N, Save_Parent);
2109 Id := Defining_Entity (N);
2110 Generate_Definition (Id);
2112 -- Expansion is not applied to generic units.
2117 Set_Ekind (Id, E_Generic_Package);
2118 Set_Etype (Id, Standard_Void_Type);
2120 Enter_Generic_Scope (Id);
2121 Set_Inner_Instances (Id, New_Elmt_List);
2123 Set_Categorization_From_Pragmas (N);
2124 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2126 -- Link the declaration of the generic homonym in the generic copy
2127 -- to the package it renames, so that it is always resolved properly.
2129 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2130 Set_Entity (Associated_Node (Name (Renaming)), Id);
2132 -- For a library unit, we have reconstructed the entity for the
2133 -- unit, and must reset it in the library tables.
2135 if Nkind (Parent (N)) = N_Compilation_Unit then
2136 Set_Cunit_Entity (Current_Sem_Unit, Id);
2139 Analyze_Generic_Formal_Part (N);
2141 -- After processing the generic formals, analysis proceeds
2142 -- as for a non-generic package.
2144 Analyze (Specification (N));
2146 Validate_Categorization_Dependency (N, Id);
2150 End_Package_Scope (Id);
2151 Exit_Generic_Scope (Id);
2153 if Nkind (Parent (N)) /= N_Compilation_Unit then
2154 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2155 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2156 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2159 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2160 Validate_RT_RAT_Component (N);
2162 -- If this is a spec without a body, check that generic parameters
2165 if not Body_Required (Parent (N)) then
2166 Check_References (Id);
2169 end Analyze_Generic_Package_Declaration;
2171 --------------------------------------------
2172 -- Analyze_Generic_Subprogram_Declaration --
2173 --------------------------------------------
2175 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2180 Save_Parent : Node_Id;
2183 -- Create copy of generic unit,and save for instantiation.
2184 -- If the unit is a child unit, do not copy the specifications
2185 -- for the parent, which are not part of the generic tree.
2187 Save_Parent := Parent_Spec (N);
2188 Set_Parent_Spec (N, Empty);
2190 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2191 Set_Parent_Spec (New_N, Save_Parent);
2194 Spec := Specification (N);
2195 Id := Defining_Entity (Spec);
2196 Generate_Definition (Id);
2198 if Nkind (Id) = N_Defining_Operator_Symbol then
2200 ("operator symbol not allowed for generic subprogram", Id);
2207 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2209 Enter_Generic_Scope (Id);
2210 Set_Inner_Instances (Id, New_Elmt_List);
2211 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2213 Analyze_Generic_Formal_Part (N);
2215 Formals := Parameter_Specifications (Spec);
2217 if Present (Formals) then
2218 Process_Formals (Formals, Spec);
2221 if Nkind (Spec) = N_Function_Specification then
2222 Set_Ekind (Id, E_Generic_Function);
2223 Find_Type (Subtype_Mark (Spec));
2224 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2226 Set_Ekind (Id, E_Generic_Procedure);
2227 Set_Etype (Id, Standard_Void_Type);
2230 -- For a library unit, we have reconstructed the entity for the
2231 -- unit, and must reset it in the library tables. We also need
2232 -- to make sure that Body_Required is set properly in the original
2233 -- compilation unit node.
2235 if Nkind (Parent (N)) = N_Compilation_Unit then
2236 Set_Cunit_Entity (Current_Sem_Unit, Id);
2237 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2240 Set_Categorization_From_Pragmas (N);
2241 Validate_Categorization_Dependency (N, Id);
2243 Save_Global_References (Original_Node (N));
2247 Exit_Generic_Scope (Id);
2248 Generate_Reference_To_Formals (Id);
2249 end Analyze_Generic_Subprogram_Declaration;
2251 -----------------------------------
2252 -- Analyze_Package_Instantiation --
2253 -----------------------------------
2255 -- Note: this procedure is also used for formal package declarations,
2256 -- in which case the argument N is an N_Formal_Package_Declaration
2257 -- node. This should really be noted in the spec! ???
2259 procedure Analyze_Package_Instantiation (N : Node_Id) is
2260 Loc : constant Source_Ptr := Sloc (N);
2261 Gen_Id : constant Node_Id := Name (N);
2264 Act_Decl_Name : Node_Id;
2265 Act_Decl_Id : Entity_Id;
2270 Gen_Unit : Entity_Id;
2272 Is_Actual_Pack : constant Boolean :=
2273 Is_Internal (Defining_Entity (N));
2275 Parent_Installed : Boolean := False;
2276 Renaming_List : List_Id;
2277 Unit_Renaming : Node_Id;
2278 Needs_Body : Boolean;
2279 Inline_Now : Boolean := False;
2281 procedure Delay_Descriptors (E : Entity_Id);
2282 -- Delay generation of subprogram descriptors for given entity
2284 function Might_Inline_Subp return Boolean;
2285 -- If inlining is active and the generic contains inlined subprograms,
2286 -- we instantiate the body. This may cause superfluous instantiations,
2287 -- but it is simpler than detecting the need for the body at the point
2288 -- of inlining, when the context of the instance is not available.
2290 -----------------------
2291 -- Delay_Descriptors --
2292 -----------------------
2294 procedure Delay_Descriptors (E : Entity_Id) is
2296 if not Delay_Subprogram_Descriptors (E) then
2297 Set_Delay_Subprogram_Descriptors (E);
2298 Pending_Descriptor.Increment_Last;
2299 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2301 end Delay_Descriptors;
2303 -----------------------
2304 -- Might_Inline_Subp --
2305 -----------------------
2307 function Might_Inline_Subp return Boolean is
2311 if not Inline_Processing_Required then
2315 E := First_Entity (Gen_Unit);
2317 while Present (E) loop
2319 if Is_Subprogram (E)
2320 and then Is_Inlined (E)
2330 end Might_Inline_Subp;
2332 -- Start of processing for Analyze_Package_Instantiation
2335 -- Very first thing: apply the special kludge for Text_IO processing
2336 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2338 Text_IO_Kludge (Name (N));
2340 -- Make node global for error reporting.
2342 Instantiation_Node := N;
2344 -- Case of instantiation of a generic package
2346 if Nkind (N) = N_Package_Instantiation then
2347 Act_Decl_Id := New_Copy (Defining_Entity (N));
2348 Set_Comes_From_Source (Act_Decl_Id, True);
2350 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2352 Make_Defining_Program_Unit_Name (Loc,
2353 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2354 Defining_Identifier => Act_Decl_Id);
2356 Act_Decl_Name := Act_Decl_Id;
2359 -- Case of instantiation of a formal package
2362 Act_Decl_Id := Defining_Identifier (N);
2363 Act_Decl_Name := Act_Decl_Id;
2366 Generate_Definition (Act_Decl_Id);
2367 Pre_Analyze_Actuals (N);
2370 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2371 Gen_Unit := Entity (Gen_Id);
2373 -- Verify that it is the name of a generic package
2375 if Etype (Gen_Unit) = Any_Type then
2379 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2381 -- Ada 0Y (AI-50217): Instance can not be used in limited with_clause
2383 if From_With_Type (Gen_Unit) then
2385 ("cannot instantiate a limited withed package", Gen_Id);
2388 ("expect name of generic package in instantiation", Gen_Id);
2395 if In_Extended_Main_Source_Unit (N) then
2396 Set_Is_Instantiated (Gen_Unit);
2397 Generate_Reference (Gen_Unit, N);
2399 if Present (Renamed_Object (Gen_Unit)) then
2400 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2401 Generate_Reference (Renamed_Object (Gen_Unit), N);
2405 if Nkind (Gen_Id) = N_Identifier
2406 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2409 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2411 elsif Nkind (Gen_Id) = N_Expanded_Name
2412 and then Is_Child_Unit (Gen_Unit)
2413 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2414 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2417 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2420 Set_Entity (Gen_Id, Gen_Unit);
2422 -- If generic is a renaming, get original generic unit.
2424 if Present (Renamed_Object (Gen_Unit))
2425 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2427 Gen_Unit := Renamed_Object (Gen_Unit);
2430 -- Verify that there are no circular instantiations.
2432 if In_Open_Scopes (Gen_Unit) then
2433 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2437 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2438 Error_Msg_Node_2 := Current_Scope;
2440 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2441 Circularity_Detected := True;
2446 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
2447 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2449 -- Initialize renamings map, for error checking, and the list
2450 -- that holds private entities whose views have changed between
2451 -- generic definition and instantiation. If this is the instance
2452 -- created to validate an actual package, the instantiation
2453 -- environment is that of the enclosing instance.
2455 Generic_Renamings.Set_Last (0);
2456 Generic_Renamings_HTable.Reset;
2458 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2460 -- Copy original generic tree, to produce text for instantiation.
2464 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2466 Act_Spec := Specification (Act_Tree);
2468 -- If this is the instance created to validate an actual package,
2469 -- only the formals matter, do not examine the package spec itself.
2471 if Is_Actual_Pack then
2472 Set_Visible_Declarations (Act_Spec, New_List);
2473 Set_Private_Declarations (Act_Spec, New_List);
2477 Analyze_Associations
2479 Generic_Formal_Declarations (Act_Tree),
2480 Generic_Formal_Declarations (Gen_Decl));
2482 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2483 Set_Is_Generic_Instance (Act_Decl_Id);
2485 Set_Generic_Parent (Act_Spec, Gen_Unit);
2487 -- References to the generic in its own declaration or its body
2488 -- are references to the instance. Add a renaming declaration for
2489 -- the generic unit itself. This declaration, as well as the renaming
2490 -- declarations for the generic formals, must remain private to the
2491 -- unit: the formals, because this is the language semantics, and
2492 -- the unit because its use is an artifact of the implementation.
2495 Make_Package_Renaming_Declaration (Loc,
2496 Defining_Unit_Name =>
2497 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2498 Name => New_Reference_To (Act_Decl_Id, Loc));
2500 Append (Unit_Renaming, Renaming_List);
2502 -- The renaming declarations are the first local declarations of
2505 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2507 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2509 Set_Visible_Declarations (Act_Spec, Renaming_List);
2513 Make_Package_Declaration (Loc,
2514 Specification => Act_Spec);
2516 -- Save the instantiation node, for subsequent instantiation
2517 -- of the body, if there is one and we are generating code for
2518 -- the current unit. Mark the unit as having a body, to avoid
2519 -- a premature error message.
2521 -- We instantiate the body if we are generating code, if we are
2522 -- generating cross-reference information, or if we are building
2523 -- trees for ASIS use.
2526 Enclosing_Body_Present : Boolean := False;
2527 -- If the generic unit is not a compilation unit, then a body
2528 -- may be present in its parent even if none is required. We
2529 -- create a tentative pending instantiation for the body, which
2530 -- will be discarded if none is actually present.
2535 if Scope (Gen_Unit) /= Standard_Standard
2536 and then not Is_Child_Unit (Gen_Unit)
2538 Scop := Scope (Gen_Unit);
2540 while Present (Scop)
2541 and then Scop /= Standard_Standard
2543 if Unit_Requires_Body (Scop) then
2544 Enclosing_Body_Present := True;
2548 exit when Is_Compilation_Unit (Scop);
2549 Scop := Scope (Scop);
2553 -- If front-end inlining is enabled, and this is a unit for which
2554 -- code will be generated, we instantiate the body at once.
2555 -- This is done if the instance is not the main unit, and if the
2556 -- generic is not a child unit of another generic, to avoid scope
2557 -- problems and the reinstallation of parent instances.
2559 if Front_End_Inlining
2560 and then Expander_Active
2561 and then (not Is_Child_Unit (Gen_Unit)
2562 or else not Is_Generic_Unit (Scope (Gen_Unit)))
2563 and then Is_In_Main_Unit (N)
2564 and then Nkind (Parent (N)) /= N_Compilation_Unit
2565 and then Might_Inline_Subp
2566 and then not Is_Actual_Pack
2572 (Unit_Requires_Body (Gen_Unit)
2573 or else Enclosing_Body_Present
2574 or else Present (Corresponding_Body (Gen_Decl)))
2575 and then (Is_In_Main_Unit (N)
2576 or else Might_Inline_Subp)
2577 and then not Is_Actual_Pack
2578 and then not Inline_Now
2580 and then (Operating_Mode = Generate_Code
2581 or else (Operating_Mode = Check_Semantics
2582 and then ASIS_Mode));
2584 -- If front_end_inlining is enabled, do not instantiate a
2585 -- body if within a generic context.
2587 if Front_End_Inlining
2588 and then not Expander_Active
2590 Needs_Body := False;
2593 -- If the current context is generic, and the package being
2594 -- instantiated is declared within a formal package, there
2595 -- is no body to instantiate until the enclosing generic is
2596 -- instantiated, and there is an actual for the formal
2597 -- package. If the formal package has parameters, we build a
2598 -- regular package instance for it, that preceeds the original
2599 -- formal package declaration.
2601 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
2603 Decl : constant Node_Id :=
2605 (Unit_Declaration_Node (Scope (Gen_Unit)));
2607 if Nkind (Decl) = N_Formal_Package_Declaration
2608 or else (Nkind (Decl) = N_Package_Declaration
2609 and then Is_List_Member (Decl)
2610 and then Present (Next (Decl))
2612 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
2614 Needs_Body := False;
2620 -- If we are generating the calling stubs from the instantiation
2621 -- of a generic RCI package, we will not use the body of the
2624 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2625 and then Is_Compilation_Unit (Defining_Entity (N))
2627 Needs_Body := False;
2632 -- Here is a defence against a ludicrous number of instantiations
2633 -- caused by a circular set of instantiation attempts.
2635 if Pending_Instantiations.Last >
2636 Hostparm.Max_Instantiations
2638 Error_Msg_N ("too many instantiations", N);
2639 raise Unrecoverable_Error;
2642 -- Indicate that the enclosing scopes contain an instantiation,
2643 -- and that cleanup actions should be delayed until after the
2644 -- instance body is expanded.
2646 Check_Forward_Instantiation (Gen_Decl);
2647 if Nkind (N) = N_Package_Instantiation then
2649 Enclosing_Master : Entity_Id := Current_Scope;
2652 while Enclosing_Master /= Standard_Standard loop
2654 if Ekind (Enclosing_Master) = E_Package then
2655 if Is_Compilation_Unit (Enclosing_Master) then
2656 if In_Package_Body (Enclosing_Master) then
2658 (Body_Entity (Enclosing_Master));
2667 Enclosing_Master := Scope (Enclosing_Master);
2670 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2671 Enclosing_Master := Scope (Enclosing_Master);
2673 elsif Is_Generic_Subprogram (Enclosing_Master)
2674 or else Ekind (Enclosing_Master) = E_Void
2676 -- Cleanup actions will eventually be performed on
2677 -- the enclosing instance, if any. enclosing scope
2678 -- is void in the formal part of a generic subp.
2683 if Ekind (Enclosing_Master) = E_Entry
2685 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2688 Protected_Body_Subprogram (Enclosing_Master);
2691 Set_Delay_Cleanups (Enclosing_Master);
2693 while Ekind (Enclosing_Master) = E_Block loop
2694 Enclosing_Master := Scope (Enclosing_Master);
2697 if Is_Subprogram (Enclosing_Master) then
2698 Delay_Descriptors (Enclosing_Master);
2700 elsif Is_Task_Type (Enclosing_Master) then
2702 TBP : constant Node_Id :=
2703 Get_Task_Body_Procedure
2707 if Present (TBP) then
2708 Delay_Descriptors (TBP);
2709 Set_Delay_Cleanups (TBP);
2719 -- Make entry in table
2721 Pending_Instantiations.Increment_Last;
2722 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2723 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2727 Set_Categorization_From_Pragmas (Act_Decl);
2729 if Parent_Installed then
2733 Set_Instance_Spec (N, Act_Decl);
2735 -- If not a compilation unit, insert the package declaration
2736 -- before the original instantiation node.
2738 if Nkind (Parent (N)) /= N_Compilation_Unit then
2739 Mark_Rewrite_Insertion (Act_Decl);
2740 Insert_Before (N, Act_Decl);
2743 -- For an instantiation that is a compilation unit, place
2744 -- declaration on current node so context is complete
2745 -- for analysis (including nested instantiations). It this
2746 -- is the main unit, the declaration eventually replaces the
2747 -- instantiation node. If the instance body is later created, it
2748 -- replaces the instance node, and the declation is attached to
2749 -- it (see Build_Instance_Compilation_Unit_Nodes).
2752 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2754 -- The entity for the current unit is the newly created one,
2755 -- and all semantic information is attached to it.
2757 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2759 -- If this is the main unit, replace the main entity as well.
2761 if Current_Sem_Unit = Main_Unit then
2762 Main_Unit_Entity := Act_Decl_Id;
2766 Set_Unit (Parent (N), Act_Decl);
2767 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2769 Set_Unit (Parent (N), N);
2770 Set_Body_Required (Parent (N), False);
2772 -- We never need elaboration checks on instantiations, since
2773 -- by definition, the body instantiation is elaborated at the
2774 -- same time as the spec instantiation.
2776 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2777 Set_Kill_Elaboration_Checks (Act_Decl_Id);
2780 Check_Elab_Instantiation (N);
2782 if ABE_Is_Certain (N) and then Needs_Body then
2783 Pending_Instantiations.Decrement_Last;
2785 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2787 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2788 First_Private_Entity (Act_Decl_Id));
2790 -- If the instantiation will receive a body, the unit will
2791 -- be transformed into a package body, and receive its own
2792 -- elaboration entity. Otherwise, the nature of the unit is
2793 -- now a package declaration.
2795 if Nkind (Parent (N)) = N_Compilation_Unit
2796 and then not Needs_Body
2798 Rewrite (N, Act_Decl);
2801 if Present (Corresponding_Body (Gen_Decl))
2802 or else Unit_Requires_Body (Gen_Unit)
2804 Set_Has_Completion (Act_Decl_Id);
2807 Check_Formal_Packages (Act_Decl_Id);
2809 Restore_Private_Views (Act_Decl_Id);
2811 if not Generic_Separately_Compiled (Gen_Unit) then
2812 Inherit_Context (Gen_Decl, N);
2815 if Parent_Installed then
2822 Validate_Categorization_Dependency (N, Act_Decl_Id);
2824 -- Check restriction, but skip this if something went wrong in
2825 -- the above analysis, indicated by Act_Decl_Id being void.
2827 if Ekind (Act_Decl_Id) /= E_Void
2828 and then not Is_Library_Level_Entity (Act_Decl_Id)
2830 Check_Restriction (No_Local_Allocators, N);
2834 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2838 when Instantiation_Error =>
2839 if Parent_Installed then
2842 end Analyze_Package_Instantiation;
2844 ---------------------------
2845 -- Inline_Instance_Body --
2846 ---------------------------
2848 procedure Inline_Instance_Body
2850 Gen_Unit : Entity_Id;
2854 Gen_Comp : constant Entity_Id :=
2855 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2856 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2857 Curr_Scope : Entity_Id := Empty;
2858 Curr_Unit : constant Entity_Id :=
2859 Cunit_Entity (Current_Sem_Unit);
2860 Removed : Boolean := False;
2861 Num_Scopes : Int := 0;
2862 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2863 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2864 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2865 Num_Inner : Int := 0;
2866 N_Instances : Int := 0;
2870 -- Case of generic unit defined in another unit. We must remove
2871 -- the complete context of the current unit to install that of
2874 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2878 and then S /= Standard_Standard
2880 Num_Scopes := Num_Scopes + 1;
2882 Use_Clauses (Num_Scopes) :=
2884 (Scope_Stack.Last - Num_Scopes + 1).
2886 End_Use_Clauses (Use_Clauses (Num_Scopes));
2888 exit when Is_Generic_Instance (S)
2889 and then (In_Package_Body (S)
2890 or else Ekind (S) = E_Procedure
2891 or else Ekind (S) = E_Function);
2895 Vis := Is_Immediately_Visible (Gen_Comp);
2897 -- Find and save all enclosing instances
2902 and then S /= Standard_Standard
2904 if Is_Generic_Instance (S) then
2905 N_Instances := N_Instances + 1;
2906 Instances (N_Instances) := S;
2908 exit when In_Package_Body (S);
2914 -- Remove context of current compilation unit, unless we
2915 -- are within a nested package instantiation, in which case
2916 -- the context has been removed previously.
2918 -- If current scope is the body of a child unit, remove context
2924 and then S /= Standard_Standard
2926 exit when Is_Generic_Instance (S)
2927 and then (In_Package_Body (S)
2928 or else Ekind (S) = E_Procedure
2929 or else Ekind (S) = E_Function);
2932 or else (Ekind (Curr_Unit) = E_Package_Body
2933 and then S = Spec_Entity (Curr_Unit))
2934 or else (Ekind (Curr_Unit) = E_Subprogram_Body
2937 (Unit_Declaration_Node (Curr_Unit)))
2941 -- Remove entities in current scopes from visibility, so
2942 -- than instance body is compiled in a clean environment.
2944 Save_Scope_Stack (Handle_Use => False);
2946 if Is_Child_Unit (S) then
2948 -- Remove child unit from stack, as well as inner scopes.
2949 -- Removing the context of a child unit removes parent
2952 while Current_Scope /= S loop
2953 Num_Inner := Num_Inner + 1;
2954 Inner_Scopes (Num_Inner) := Current_Scope;
2959 Remove_Context (Curr_Comp);
2963 Remove_Context (Curr_Comp);
2966 if Ekind (Curr_Unit) = E_Package_Body then
2967 Remove_Context (Library_Unit (Curr_Comp));
2974 New_Scope (Standard_Standard);
2975 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
2976 Instantiate_Package_Body
2977 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
2982 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2984 -- Reset Generic_Instance flag so that use clauses can be installed
2985 -- in the proper order. (See Use_One_Package for effect of enclosing
2986 -- instances on processing of use clauses).
2988 for J in 1 .. N_Instances loop
2989 Set_Is_Generic_Instance (Instances (J), False);
2993 Install_Context (Curr_Comp);
2995 if Present (Curr_Scope)
2996 and then Is_Child_Unit (Curr_Scope)
2998 New_Scope (Curr_Scope);
2999 Set_Is_Immediately_Visible (Curr_Scope);
3001 -- Finally, restore inner scopes as well.
3003 for J in reverse 1 .. Num_Inner loop
3004 New_Scope (Inner_Scopes (J));
3008 Restore_Scope_Stack (Handle_Use => False);
3011 -- Restore use clauses. For a child unit, use clauses in the
3012 -- parents are restored when installing the context, so only
3013 -- those in inner scopes (and those local to the child unit itself)
3014 -- need to be installed explicitly.
3016 if Is_Child_Unit (Curr_Unit)
3019 for J in reverse 1 .. Num_Inner + 1 loop
3020 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3022 Install_Use_Clauses (Use_Clauses (J));
3026 for J in reverse 1 .. Num_Scopes loop
3027 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3029 Install_Use_Clauses (Use_Clauses (J));
3033 for J in 1 .. N_Instances loop
3034 Set_Is_Generic_Instance (Instances (J), True);
3037 -- If generic unit is in current unit, current context is correct.
3040 Instantiate_Package_Body
3041 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3043 end Inline_Instance_Body;
3045 -------------------------------------
3046 -- Analyze_Procedure_Instantiation --
3047 -------------------------------------
3049 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3051 Analyze_Subprogram_Instantiation (N, E_Procedure);
3052 end Analyze_Procedure_Instantiation;
3054 --------------------------------------
3055 -- Analyze_Subprogram_Instantiation --
3056 --------------------------------------
3058 procedure Analyze_Subprogram_Instantiation
3062 Loc : constant Source_Ptr := Sloc (N);
3063 Gen_Id : constant Node_Id := Name (N);
3065 Anon_Id : constant Entity_Id :=
3066 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3067 Chars => New_External_Name
3068 (Chars (Defining_Entity (N)), 'R'));
3070 Act_Decl_Id : Entity_Id;
3075 Gen_Unit : Entity_Id;
3077 Pack_Id : Entity_Id;
3078 Parent_Installed : Boolean := False;
3079 Renaming_List : List_Id;
3081 procedure Analyze_Instance_And_Renamings;
3082 -- The instance must be analyzed in a context that includes the
3083 -- mappings of generic parameters into actuals. We create a package
3084 -- declaration for this purpose, and a subprogram with an internal
3085 -- name within the package. The subprogram instance is simply an
3086 -- alias for the internal subprogram, declared in the current scope.
3088 ------------------------------------
3089 -- Analyze_Instance_And_Renamings --
3090 ------------------------------------
3092 procedure Analyze_Instance_And_Renamings is
3093 Def_Ent : constant Entity_Id := Defining_Entity (N);
3094 Pack_Decl : Node_Id;
3097 if Nkind (Parent (N)) = N_Compilation_Unit then
3099 -- For the case of a compilation unit, the container package
3100 -- has the same name as the instantiation, to insure that the
3101 -- binder calls the elaboration procedure with the right name.
3102 -- Copy the entity of the instance, which may have compilation
3103 -- level flags (e.g. Is_Child_Unit) set.
3105 Pack_Id := New_Copy (Def_Ent);
3108 -- Otherwise we use the name of the instantiation concatenated
3109 -- with its source position to ensure uniqueness if there are
3110 -- several instantiations with the same name.
3113 Make_Defining_Identifier (Loc,
3114 Chars => New_External_Name
3115 (Related_Id => Chars (Def_Ent),
3117 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3120 Pack_Decl := Make_Package_Declaration (Loc,
3121 Specification => Make_Package_Specification (Loc,
3122 Defining_Unit_Name => Pack_Id,
3123 Visible_Declarations => Renaming_List,
3124 End_Label => Empty));
3126 Set_Instance_Spec (N, Pack_Decl);
3127 Set_Is_Generic_Instance (Pack_Id);
3128 Set_Needs_Debug_Info (Pack_Id);
3130 -- Case of not a compilation unit
3132 if Nkind (Parent (N)) /= N_Compilation_Unit then
3133 Mark_Rewrite_Insertion (Pack_Decl);
3134 Insert_Before (N, Pack_Decl);
3135 Set_Has_Completion (Pack_Id);
3137 -- Case of an instantiation that is a compilation unit
3139 -- Place declaration on current node so context is complete
3140 -- for analysis (including nested instantiations), and for
3141 -- use in a context_clause (see Analyze_With_Clause).
3144 Set_Unit (Parent (N), Pack_Decl);
3145 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3148 Analyze (Pack_Decl);
3149 Check_Formal_Packages (Pack_Id);
3150 Set_Is_Generic_Instance (Pack_Id, False);
3152 -- Body of the enclosing package is supplied when instantiating
3153 -- the subprogram body, after semantic analysis is completed.
3155 if Nkind (Parent (N)) = N_Compilation_Unit then
3157 -- Remove package itself from visibility, so it does not
3158 -- conflict with subprogram.
3160 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3162 -- Set name and scope of internal subprogram so that the
3163 -- proper external name will be generated. The proper scope
3164 -- is the scope of the wrapper package. We need to generate
3165 -- debugging information for the internal subprogram, so set
3166 -- flag accordingly.
3168 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3169 Set_Scope (Anon_Id, Scope (Pack_Id));
3171 -- Mark wrapper package as referenced, to avoid spurious
3172 -- warnings if the instantiation appears in various with_
3173 -- clauses of subunits of the main unit.
3175 Set_Referenced (Pack_Id);
3178 Set_Is_Generic_Instance (Anon_Id);
3179 Set_Needs_Debug_Info (Anon_Id);
3180 Act_Decl_Id := New_Copy (Anon_Id);
3182 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3183 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3184 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3185 Set_Comes_From_Source (Act_Decl_Id, True);
3187 -- The signature may involve types that are not frozen yet, but
3188 -- the subprogram will be frozen at the point the wrapper package
3189 -- is frozen, so it does not need its own freeze node. In fact, if
3190 -- one is created, it might conflict with the freezing actions from
3191 -- the wrapper package (see 7206-013).
3193 Set_Has_Delayed_Freeze (Anon_Id, False);
3195 -- If the instance is a child unit, mark the Id accordingly. Mark
3196 -- the anonymous entity as well, which is the real subprogram and
3197 -- which is used when the instance appears in a context clause.
3199 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3200 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3201 New_Overloaded_Entity (Act_Decl_Id);
3202 Check_Eliminated (Act_Decl_Id);
3204 -- In compilation unit case, kill elaboration checks on the
3205 -- instantiation, since they are never needed -- the body is
3206 -- instantiated at the same point as the spec.
3208 if Nkind (Parent (N)) = N_Compilation_Unit then
3209 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3210 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3211 Set_Is_Compilation_Unit (Anon_Id);
3213 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3216 -- The instance is not a freezing point for the new subprogram.
3218 Set_Is_Frozen (Act_Decl_Id, False);
3220 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3221 Valid_Operator_Definition (Act_Decl_Id);
3224 Set_Alias (Act_Decl_Id, Anon_Id);
3225 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3226 Set_Has_Completion (Act_Decl_Id);
3227 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3229 if Nkind (Parent (N)) = N_Compilation_Unit then
3230 Set_Body_Required (Parent (N), False);
3233 end Analyze_Instance_And_Renamings;
3235 -- Start of processing for Analyze_Subprogram_Instantiation
3238 -- Very first thing: apply the special kludge for Text_IO processing
3239 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3240 -- Of course such an instantiation is bogus (these are packages, not
3241 -- subprograms), but we get a better error message if we do this.
3243 Text_IO_Kludge (Gen_Id);
3245 -- Make node global for error reporting.
3247 Instantiation_Node := N;
3248 Pre_Analyze_Actuals (N);
3251 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3252 Gen_Unit := Entity (Gen_Id);
3254 Generate_Reference (Gen_Unit, Gen_Id);
3256 if Nkind (Gen_Id) = N_Identifier
3257 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3260 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3263 if Etype (Gen_Unit) = Any_Type then
3268 -- Verify that it is a generic subprogram of the right kind, and that
3269 -- it does not lead to a circular instantiation.
3271 if Ekind (Gen_Unit) /= E_Generic_Procedure
3272 and then Ekind (Gen_Unit) /= E_Generic_Function
3274 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3276 elsif In_Open_Scopes (Gen_Unit) then
3277 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3279 elsif K = E_Procedure
3280 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3282 if Ekind (Gen_Unit) = E_Generic_Function then
3284 ("cannot instantiate generic function as procedure", Gen_Id);
3287 ("expect name of generic procedure in instantiation", Gen_Id);
3290 elsif K = E_Function
3291 and then Ekind (Gen_Unit) /= E_Generic_Function
3293 if Ekind (Gen_Unit) = E_Generic_Procedure then
3295 ("cannot instantiate generic procedure as function", Gen_Id);
3298 ("expect name of generic function in instantiation", Gen_Id);
3302 Set_Entity (Gen_Id, Gen_Unit);
3303 Set_Is_Instantiated (Gen_Unit);
3305 if In_Extended_Main_Source_Unit (N) then
3306 Generate_Reference (Gen_Unit, N);
3309 -- If renaming, get original unit
3311 if Present (Renamed_Object (Gen_Unit))
3312 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3314 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3316 Gen_Unit := Renamed_Object (Gen_Unit);
3317 Set_Is_Instantiated (Gen_Unit);
3318 Generate_Reference (Gen_Unit, N);
3321 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3322 Error_Msg_Node_2 := Current_Scope;
3324 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3325 Circularity_Detected := True;
3329 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3331 -- The subprogram itself cannot contain a nested instance, so
3332 -- the current parent is left empty.
3334 Set_Instance_Env (Gen_Unit, Empty);
3336 -- Initialize renamings map, for error checking.
3338 Generic_Renamings.Set_Last (0);
3339 Generic_Renamings_HTable.Reset;
3341 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3343 -- Copy original generic tree, to produce text for instantiation.
3347 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3349 Act_Spec := Specification (Act_Tree);
3351 Analyze_Associations
3353 Generic_Formal_Declarations (Act_Tree),
3354 Generic_Formal_Declarations (Gen_Decl));
3356 -- Build the subprogram declaration, which does not appear
3357 -- in the generic template, and give it a sloc consistent
3358 -- with that of the template.
3360 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3361 Set_Generic_Parent (Act_Spec, Gen_Unit);
3363 Make_Subprogram_Declaration (Sloc (Act_Spec),
3364 Specification => Act_Spec);
3366 Set_Categorization_From_Pragmas (Act_Decl);
3368 if Parent_Installed then
3372 Append (Act_Decl, Renaming_List);
3373 Analyze_Instance_And_Renamings;
3375 -- If the generic is marked Import (Intrinsic), then so is the
3376 -- instance. This indicates that there is no body to instantiate.
3377 -- If generic is marked inline, so it the instance, and the
3378 -- anonymous subprogram it renames. If inlined, or else if inlining
3379 -- is enabled for the compilation, we generate the instance body
3380 -- even if it is not within the main unit.
3382 -- Any other pragmas might also be inherited ???
3384 if Is_Intrinsic_Subprogram (Gen_Unit) then
3385 Set_Is_Intrinsic_Subprogram (Anon_Id);
3386 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3388 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3389 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3393 Generate_Definition (Act_Decl_Id);
3395 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3396 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3398 if not Is_Intrinsic_Subprogram (Gen_Unit) then
3399 Check_Elab_Instantiation (N);
3402 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3404 -- Subject to change, pending on if other pragmas are inherited ???
3406 Validate_Categorization_Dependency (N, Act_Decl_Id);
3408 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3410 if not Generic_Separately_Compiled (Gen_Unit) then
3411 Inherit_Context (Gen_Decl, N);
3414 Restore_Private_Views (Pack_Id, False);
3416 -- If the context requires a full instantiation, mark node for
3417 -- subsequent construction of the body.
3419 if (Is_In_Main_Unit (N)
3420 or else Is_Inlined (Act_Decl_Id))
3421 and then (Operating_Mode = Generate_Code
3422 or else (Operating_Mode = Check_Semantics
3423 and then ASIS_Mode))
3424 and then (Expander_Active or else ASIS_Mode)
3425 and then not ABE_Is_Certain (N)
3426 and then not Is_Eliminated (Act_Decl_Id)
3428 Pending_Instantiations.Increment_Last;
3429 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3430 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3431 Check_Forward_Instantiation (Gen_Decl);
3433 -- The wrapper package is always delayed, because it does
3434 -- not constitute a freeze point, but to insure that the
3435 -- freeze node is placed properly, it is created directly
3436 -- when instantiating the body (otherwise the freeze node
3437 -- might appear to early for nested instantiations).
3439 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3441 -- For ASIS purposes, indicate that the wrapper package has
3442 -- replaced the instantiation node.
3444 Rewrite (N, Unit (Parent (N)));
3445 Set_Unit (Parent (N), N);
3448 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3450 -- Replace instance node for library-level instantiations
3451 -- of intrinsic subprograms, for ASIS use.
3453 Rewrite (N, Unit (Parent (N)));
3454 Set_Unit (Parent (N), N);
3457 if Parent_Installed then
3462 Generic_Renamings.Set_Last (0);
3463 Generic_Renamings_HTable.Reset;
3467 when Instantiation_Error =>
3468 if Parent_Installed then
3471 end Analyze_Subprogram_Instantiation;
3473 -------------------------
3474 -- Get_Associated_Node --
3475 -------------------------
3477 function Get_Associated_Node (N : Node_Id) return Node_Id is
3478 Assoc : Node_Id := Associated_Node (N);
3481 if Nkind (Assoc) /= Nkind (N) then
3484 elsif Nkind (Assoc) = N_Aggregate
3485 or else Nkind (Assoc) = N_Extension_Aggregate
3489 -- If the node is part of an inner generic, it may itself have been
3490 -- remapped into a further generic copy. Associated_Node is otherwise
3491 -- used for the entity of the node, and will be of a different node
3492 -- kind, or else N has been rewritten as a literal or function call.
3494 while Present (Associated_Node (Assoc))
3495 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3497 Assoc := Associated_Node (Assoc);
3500 -- Follow and additional link in case the final node was rewritten.
3501 -- This can only happen with nested generic units.
3503 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3504 and then Present (Associated_Node (Assoc))
3505 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3507 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3509 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3511 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3513 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3515 Assoc := Associated_Node (Assoc);
3520 end Get_Associated_Node;
3522 -------------------------------------------
3523 -- Build_Instance_Compilation_Unit_Nodes --
3524 -------------------------------------------
3526 procedure Build_Instance_Compilation_Unit_Nodes
3531 Decl_Cunit : Node_Id;
3532 Body_Cunit : Node_Id;
3534 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3535 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3538 -- A new compilation unit node is built for the instance declaration
3541 Make_Compilation_Unit (Sloc (N),
3542 Context_Items => Empty_List,
3545 Make_Compilation_Unit_Aux (Sloc (N)));
3547 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3548 Set_Body_Required (Decl_Cunit, True);
3550 -- We use the original instantiation compilation unit as the resulting
3551 -- compilation unit of the instance, since this is the main unit.
3553 Rewrite (N, Act_Body);
3554 Body_Cunit := Parent (N);
3556 -- The two compilation unit nodes are linked by the Library_Unit field
3558 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3559 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3561 -- Preserve the private nature of the package if needed.
3563 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
3565 -- If the instance is not the main unit, its context, categorization,
3566 -- and elaboration entity are not relevant to the compilation.
3568 if Parent (N) /= Cunit (Main_Unit) then
3572 -- The context clause items on the instantiation, which are now
3573 -- attached to the body compilation unit (since the body overwrote
3574 -- the original instantiation node), semantically belong on the spec,
3575 -- so copy them there. It's harmless to leave them on the body as well.
3576 -- In fact one could argue that they belong in both places.
3578 Citem := First (Context_Items (Body_Cunit));
3579 while Present (Citem) loop
3580 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3584 -- Propagate categorization flags on packages, so that they appear
3585 -- in ali file for the spec of the unit.
3587 if Ekind (New_Main) = E_Package then
3588 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3589 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3590 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3591 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3592 Set_Is_Remote_Call_Interface
3593 (Old_Main, Is_Remote_Call_Interface (New_Main));
3596 -- Make entry in Units table, so that binder can generate call to
3597 -- elaboration procedure for body, if any.
3599 Make_Instance_Unit (Body_Cunit);
3600 Main_Unit_Entity := New_Main;
3601 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3603 -- Build elaboration entity, since the instance may certainly
3604 -- generate elaboration code requiring a flag for protection.
3606 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3607 end Build_Instance_Compilation_Unit_Nodes;
3609 -----------------------------------
3610 -- Check_Formal_Package_Instance --
3611 -----------------------------------
3613 -- If the formal has specific parameters, they must match those of the
3614 -- actual. Both of them are instances, and the renaming declarations
3615 -- for their formal parameters appear in the same order in both. The
3616 -- analyzed formal has been analyzed in the context of the current
3619 procedure Check_Formal_Package_Instance
3620 (Formal_Pack : Entity_Id;
3621 Actual_Pack : Entity_Id)
3623 E1 : Entity_Id := First_Entity (Actual_Pack);
3624 E2 : Entity_Id := First_Entity (Formal_Pack);
3629 procedure Check_Mismatch (B : Boolean);
3630 -- Common error routine for mismatch between the parameters of
3631 -- the actual instance and those of the formal package.
3633 procedure Check_Mismatch (B : Boolean) is
3637 ("actual for & in actual instance does not match formal",
3638 Parent (Actual_Pack), E1);
3642 -- Start of processing for Check_Formal_Package_Instance
3646 and then Present (E2)
3648 exit when Ekind (E1) = E_Package
3649 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3651 if Is_Type (E1) then
3653 -- Subtypes must statically match. E1 and E2 are the
3654 -- local entities that are subtypes of the actuals.
3655 -- Itypes generated for other parameters need not be checked,
3656 -- the check will be performed on the parameters themselves.
3658 if not Is_Itype (E1)
3659 and then not Is_Itype (E2)
3663 or else Etype (E1) /= Etype (E2)
3664 or else not Subtypes_Statically_Match (E1, E2));
3667 elsif Ekind (E1) = E_Constant then
3669 -- IN parameters must denote the same static value, or
3670 -- the same constant, or the literal null.
3672 Expr1 := Expression (Parent (E1));
3674 if Ekind (E2) /= E_Constant then
3675 Check_Mismatch (True);
3678 Expr2 := Expression (Parent (E2));
3681 if Is_Static_Expression (Expr1) then
3683 if not Is_Static_Expression (Expr2) then
3684 Check_Mismatch (True);
3686 elsif Is_Integer_Type (Etype (E1)) then
3689 V1 : constant Uint := Expr_Value (Expr1);
3690 V2 : constant Uint := Expr_Value (Expr2);
3692 Check_Mismatch (V1 /= V2);
3695 elsif Is_Real_Type (Etype (E1)) then
3697 V1 : constant Ureal := Expr_Value_R (Expr1);
3698 V2 : constant Ureal := Expr_Value_R (Expr2);
3700 Check_Mismatch (V1 /= V2);
3703 elsif Is_String_Type (Etype (E1))
3704 and then Nkind (Expr1) = N_String_Literal
3707 if Nkind (Expr2) /= N_String_Literal then
3708 Check_Mismatch (True);
3711 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3715 elsif Is_Entity_Name (Expr1) then
3716 if Is_Entity_Name (Expr2) then
3717 if Entity (Expr1) = Entity (Expr2) then
3720 elsif Ekind (Entity (Expr2)) = E_Constant
3721 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3723 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3727 Check_Mismatch (True);
3730 Check_Mismatch (True);
3733 elsif Nkind (Expr1) = N_Null then
3734 Check_Mismatch (Nkind (Expr1) /= N_Null);
3737 Check_Mismatch (True);
3740 elsif Ekind (E1) = E_Variable
3741 or else Ekind (E1) = E_Package
3744 (Ekind (E1) /= Ekind (E2)
3745 or else Renamed_Object (E1) /= Renamed_Object (E2));
3747 elsif Is_Overloadable (E1) then
3749 -- Verify that the names of the entities match.
3750 -- What if actual is an attribute ???
3753 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3756 raise Program_Error;
3763 end Check_Formal_Package_Instance;
3765 ---------------------------
3766 -- Check_Formal_Packages --
3767 ---------------------------
3769 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3771 Formal_P : Entity_Id;
3774 -- Iterate through the declarations in the instance, looking for
3775 -- package renaming declarations that denote instances of formal
3776 -- packages. Stop when we find the renaming of the current package
3777 -- itself. The declaration for a formal package without a box is
3778 -- followed by an internal entity that repeats the instantiation.
3780 E := First_Entity (P_Id);
3781 while Present (E) loop
3782 if Ekind (E) = E_Package then
3783 if Renamed_Object (E) = P_Id then
3786 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3789 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3790 Formal_P := Next_Entity (E);
3791 Check_Formal_Package_Instance (Formal_P, E);
3797 end Check_Formal_Packages;
3799 ---------------------------------
3800 -- Check_Forward_Instantiation --
3801 ---------------------------------
3803 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3805 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3808 -- The instantiation appears before the generic body if we are in the
3809 -- scope of the unit containing the generic, either in its spec or in
3810 -- the package body. and before the generic body.
3812 if Ekind (Gen_Comp) = E_Package_Body then
3813 Gen_Comp := Spec_Entity (Gen_Comp);
3816 if In_Open_Scopes (Gen_Comp)
3817 and then No (Corresponding_Body (Decl))
3822 and then not Is_Compilation_Unit (S)
3823 and then not Is_Child_Unit (S)
3825 if Ekind (S) = E_Package then
3826 Set_Has_Forward_Instantiation (S);
3832 end Check_Forward_Instantiation;
3834 ---------------------------
3835 -- Check_Generic_Actuals --
3836 ---------------------------
3838 -- The visibility of the actuals may be different between the
3839 -- point of generic instantiation and the instantiation of the body.
3841 procedure Check_Generic_Actuals
3842 (Instance : Entity_Id;
3843 Is_Formal_Box : Boolean)
3849 E := First_Entity (Instance);
3850 while Present (E) loop
3852 and then Nkind (Parent (E)) = N_Subtype_Declaration
3853 and then Scope (Etype (E)) /= Instance
3854 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3856 Check_Private_View (Subtype_Indication (Parent (E)));
3857 Set_Is_Generic_Actual_Type (E, True);
3858 Set_Is_Hidden (E, False);
3860 -- We constructed the generic actual type as a subtype of
3861 -- the supplied type. This means that it normally would not
3862 -- inherit subtype specific attributes of the actual, which
3863 -- is wrong for the generic case.
3865 Astype := Ancestor_Subtype (E);
3869 -- can happen when E is an itype that is the full view of
3870 -- a private type completed, e.g. with a constrained array.
3872 Astype := Base_Type (E);
3875 Set_Size_Info (E, (Astype));
3876 Set_RM_Size (E, RM_Size (Astype));
3877 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3879 if Is_Discrete_Or_Fixed_Point_Type (E) then
3880 Set_RM_Size (E, RM_Size (Astype));
3882 -- In nested instances, the base type of an access actual
3883 -- may itself be private, and need to be exchanged.
3885 elsif Is_Access_Type (E)
3886 and then Is_Private_Type (Etype (E))
3889 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3892 elsif Ekind (E) = E_Package then
3894 -- If this is the renaming for the current instance, we're done.
3895 -- Otherwise it is a formal package. If the corresponding formal
3896 -- was declared with a box, the (instantiations of the) generic
3897 -- formal part are also visible. Otherwise, ignore the entity
3898 -- created to validate the actuals.
3900 if Renamed_Object (E) = Instance then
3903 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3906 -- The visibility of a formal of an enclosing generic is already
3909 elsif Denotes_Formal_Package (E) then
3912 elsif Present (Associated_Formal_Package (E))
3913 and then Box_Present (Parent (Associated_Formal_Package (E)))
3915 Check_Generic_Actuals (Renamed_Object (E), True);
3916 Set_Is_Hidden (E, False);
3919 -- If this is a subprogram instance (in a wrapper package) the
3920 -- actual is fully visible.
3922 elsif Is_Wrapper_Package (Instance) then
3923 Set_Is_Hidden (E, False);
3926 Set_Is_Hidden (E, not Is_Formal_Box);
3931 end Check_Generic_Actuals;
3933 ------------------------------
3934 -- Check_Generic_Child_Unit --
3935 ------------------------------
3937 procedure Check_Generic_Child_Unit
3939 Parent_Installed : in out Boolean)
3941 Loc : constant Source_Ptr := Sloc (Gen_Id);
3942 Gen_Par : Entity_Id := Empty;
3943 Inst_Par : Entity_Id;
3947 function Find_Generic_Child
3951 -- Search generic parent for possible child unit with the given name.
3953 function In_Enclosing_Instance return Boolean;
3954 -- Within an instance of the parent, the child unit may be denoted
3955 -- by a simple name, or an abbreviated expanded name. Examine enclosing
3956 -- scopes to locate a possible parent instantiation.
3958 ------------------------
3959 -- Find_Generic_Child --
3960 ------------------------
3962 function Find_Generic_Child
3970 -- If entity of name is already set, instance has already been
3971 -- resolved, e.g. in an enclosing instantiation.
3973 if Present (Entity (Id)) then
3974 if Scope (Entity (Id)) = Scop then
3981 E := First_Entity (Scop);
3982 while Present (E) loop
3983 if Chars (E) = Chars (Id)
3984 and then Is_Child_Unit (E)
3986 if Is_Child_Unit (E)
3987 and then not Is_Visible_Child_Unit (E)
3990 ("generic child unit& is not visible", Gen_Id, E);
4002 end Find_Generic_Child;
4004 ---------------------------
4005 -- In_Enclosing_Instance --
4006 ---------------------------
4008 function In_Enclosing_Instance return Boolean is
4009 Enclosing_Instance : Node_Id;
4010 Instance_Decl : Node_Id;
4013 Enclosing_Instance := Current_Scope;
4015 while Present (Enclosing_Instance) loop
4016 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4018 if Ekind (Enclosing_Instance) = E_Package
4019 and then Is_Generic_Instance (Enclosing_Instance)
4021 (Generic_Parent (Specification (Instance_Decl)))
4023 -- Check whether the generic we are looking for is a child
4024 -- of this instance.
4026 E := Find_Generic_Child
4027 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4028 exit when Present (E);
4034 Enclosing_Instance := Scope (Enclosing_Instance);
4046 Make_Expanded_Name (Loc,
4048 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4049 Selector_Name => New_Occurrence_Of (E, Loc)));
4051 Set_Entity (Gen_Id, E);
4052 Set_Etype (Gen_Id, Etype (E));
4053 Parent_Installed := False; -- Already in scope.
4056 end In_Enclosing_Instance;
4058 -- Start of processing for Check_Generic_Child_Unit
4061 -- If the name of the generic is given by a selected component, it
4062 -- may be the name of a generic child unit, and the prefix is the name
4063 -- of an instance of the parent, in which case the child unit must be
4064 -- visible. If this instance is not in scope, it must be placed there
4065 -- and removed after instantiation, because what is being instantiated
4066 -- is not the original child, but the corresponding child present in
4067 -- the instance of the parent.
4069 -- If the child is instantiated within the parent, it can be given by
4070 -- a simple name. In this case the instance is already in scope, but
4071 -- the child generic must be recovered from the generic parent as well.
4073 if Nkind (Gen_Id) = N_Selected_Component then
4074 S := Selector_Name (Gen_Id);
4075 Analyze (Prefix (Gen_Id));
4076 Inst_Par := Entity (Prefix (Gen_Id));
4078 if Ekind (Inst_Par) = E_Package
4079 and then Present (Renamed_Object (Inst_Par))
4081 Inst_Par := Renamed_Object (Inst_Par);
4084 if Ekind (Inst_Par) = E_Package then
4085 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
4086 Gen_Par := Generic_Parent (Parent (Inst_Par));
4088 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
4090 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
4092 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
4095 elsif Ekind (Inst_Par) = E_Generic_Package
4096 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
4098 -- A formal package may be a real child package, and not the
4099 -- implicit instance within a parent. In this case the child is
4100 -- not visible and has to be retrieved explicitly as well.
4102 Gen_Par := Inst_Par;
4105 if Present (Gen_Par) then
4107 -- The prefix denotes an instantiation. The entity itself
4108 -- may be a nested generic, or a child unit.
4110 E := Find_Generic_Child (Gen_Par, S);
4113 Change_Selected_Component_To_Expanded_Name (Gen_Id);
4114 Set_Entity (Gen_Id, E);
4115 Set_Etype (Gen_Id, Etype (E));
4117 Set_Etype (S, Etype (E));
4119 -- Indicate that this is a reference to the parent.
4121 if In_Extended_Main_Source_Unit (Gen_Id) then
4122 Set_Is_Instantiated (Inst_Par);
4125 -- A common mistake is to replicate the naming scheme of
4126 -- a hierarchy by instantiating a generic child directly,
4127 -- rather than the implicit child in a parent instance:
4129 -- generic .. package Gpar is ..
4130 -- generic .. package Gpar.Child is ..
4131 -- package Par is new Gpar ();
4134 -- package Par.Child is new Gpar.Child ();
4135 -- rather than Par.Child
4137 -- In this case the instantiation is within Par, which is
4138 -- an instance, but Gpar does not denote Par because we are
4139 -- not IN the instance of Gpar, so this is illegal. The test
4140 -- below recognizes this particular case.
4142 if Is_Child_Unit (E)
4143 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
4144 and then (not In_Instance
4145 or else Nkind (Parent (Parent (Gen_Id))) =
4149 ("prefix of generic child unit must be instance of parent",
4153 if not In_Open_Scopes (Inst_Par)
4154 and then Nkind (Parent (Gen_Id)) not in
4155 N_Generic_Renaming_Declaration
4157 Install_Parent (Inst_Par);
4158 Parent_Installed := True;
4162 -- If the generic parent does not contain an entity that
4163 -- corresponds to the selector, the instance doesn't either.
4164 -- Analyzing the node will yield the appropriate error message.
4165 -- If the entity is not a child unit, then it is an inner
4166 -- generic in the parent.
4174 if Is_Child_Unit (Entity (Gen_Id))
4176 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4177 and then not In_Open_Scopes (Inst_Par)
4179 Install_Parent (Inst_Par);
4180 Parent_Installed := True;
4184 elsif Nkind (Gen_Id) = N_Expanded_Name then
4186 -- Entity already present, analyze prefix, whose meaning may be
4187 -- an instance in the current context. If it is an instance of
4188 -- a relative within another, the proper parent may still have
4189 -- to be installed, if they are not of the same generation.
4191 Analyze (Prefix (Gen_Id));
4192 Inst_Par := Entity (Prefix (Gen_Id));
4194 if In_Enclosing_Instance then
4197 elsif Present (Entity (Gen_Id))
4198 and then Is_Child_Unit (Entity (Gen_Id))
4199 and then not In_Open_Scopes (Inst_Par)
4201 Install_Parent (Inst_Par);
4202 Parent_Installed := True;
4205 elsif In_Enclosing_Instance then
4207 -- The child unit is found in some enclosing scope
4214 -- If this is the renaming of the implicit child in a parent
4215 -- instance, recover the parent name and install it.
4217 if Is_Entity_Name (Gen_Id) then
4218 E := Entity (Gen_Id);
4220 if Is_Generic_Unit (E)
4221 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
4222 and then Is_Child_Unit (Renamed_Object (E))
4223 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
4224 and then Nkind (Name (Parent (E))) = N_Expanded_Name
4227 New_Copy_Tree (Name (Parent (E))));
4228 Inst_Par := Entity (Prefix (Gen_Id));
4230 if not In_Open_Scopes (Inst_Par) then
4231 Install_Parent (Inst_Par);
4232 Parent_Installed := True;
4235 -- If it is a child unit of a non-generic parent, it may be
4236 -- use-visible and given by a direct name. Install parent as
4239 elsif Is_Generic_Unit (E)
4240 and then Is_Child_Unit (E)
4242 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4243 and then not Is_Generic_Unit (Scope (E))
4245 if not In_Open_Scopes (Scope (E)) then
4246 Install_Parent (Scope (E));
4247 Parent_Installed := True;
4252 end Check_Generic_Child_Unit;
4254 -----------------------------
4255 -- Check_Hidden_Child_Unit --
4256 -----------------------------
4258 procedure Check_Hidden_Child_Unit
4260 Gen_Unit : Entity_Id;
4261 Act_Decl_Id : Entity_Id)
4263 Gen_Id : constant Node_Id := Name (N);
4266 if Is_Child_Unit (Gen_Unit)
4267 and then Is_Child_Unit (Act_Decl_Id)
4268 and then Nkind (Gen_Id) = N_Expanded_Name
4269 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4270 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4272 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4274 ("generic unit & is implicitly declared in &",
4275 Defining_Unit_Name (N), Gen_Unit);
4276 Error_Msg_N ("\instance must have different name",
4277 Defining_Unit_Name (N));
4279 end Check_Hidden_Child_Unit;
4281 ------------------------
4282 -- Check_Private_View --
4283 ------------------------
4285 procedure Check_Private_View (N : Node_Id) is
4286 T : constant Entity_Id := Etype (N);
4290 -- Exchange views if the type was not private in the generic but is
4291 -- private at the point of instantiation. Do not exchange views if
4292 -- the scope of the type is in scope. This can happen if both generic
4293 -- and instance are sibling units, or if type is defined in a parent.
4294 -- In this case the visibility of the type will be correct for all
4298 BT := Base_Type (T);
4300 if Is_Private_Type (T)
4301 and then not Has_Private_View (N)
4302 and then Present (Full_View (T))
4303 and then not In_Open_Scopes (Scope (T))
4305 -- In the generic, the full type was visible. Save the
4306 -- private entity, for subsequent exchange.
4310 elsif Has_Private_View (N)
4311 and then not Is_Private_Type (T)
4312 and then not Has_Been_Exchanged (T)
4313 and then Etype (Get_Associated_Node (N)) /= T
4315 -- Only the private declaration was visible in the generic. If
4316 -- the type appears in a subtype declaration, the subtype in the
4317 -- instance must have a view compatible with that of its parent,
4318 -- which must be exchanged (see corresponding code in Restore_
4319 -- Private_Views). Otherwise, if the type is defined in a parent
4320 -- unit, leave full visibility within instance, which is safe.
4322 if In_Open_Scopes (Scope (Base_Type (T)))
4323 and then not Is_Private_Type (Base_Type (T))
4324 and then Comes_From_Source (Base_Type (T))
4328 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4329 or else not In_Private_Part (Scope (Base_Type (T)))
4331 Append_Elmt (T, Exchanged_Views);
4332 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4335 -- For composite types with inconsistent representation
4336 -- exchange component types accordingly.
4338 elsif Is_Access_Type (T)
4339 and then Is_Private_Type (Designated_Type (T))
4340 and then not Has_Private_View (N)
4341 and then Present (Full_View (Designated_Type (T)))
4343 Switch_View (Designated_Type (T));
4345 elsif Is_Array_Type (T)
4346 and then Is_Private_Type (Component_Type (T))
4347 and then not Has_Private_View (N)
4348 and then Present (Full_View (Component_Type (T)))
4350 Switch_View (Component_Type (T));
4352 elsif Is_Private_Type (T)
4353 and then Present (Full_View (T))
4354 and then Is_Array_Type (Full_View (T))
4355 and then Is_Private_Type (Component_Type (Full_View (T)))
4359 -- Finally, a non-private subtype may have a private base type,
4360 -- which must be exchanged for consistency. This can happen when
4361 -- instantiating a package body, when the scope stack is empty
4362 -- but in fact the subtype and the base type are declared in an
4365 elsif not Is_Private_Type (T)
4366 and then not Has_Private_View (N)
4367 and then Is_Private_Type (Base_Type (T))
4368 and then Present (Full_View (BT))
4369 and then not Is_Generic_Type (BT)
4370 and then not In_Open_Scopes (BT)
4372 Append_Elmt (Full_View (BT), Exchanged_Views);
4373 Exchange_Declarations (BT);
4376 end Check_Private_View;
4378 --------------------------
4379 -- Contains_Instance_Of --
4380 --------------------------
4382 function Contains_Instance_Of
4394 -- Verify that there are no circular instantiations. We check whether
4395 -- the unit contains an instance of the current scope or some enclosing
4396 -- scope (in case one of the instances appears in a subunit). Longer
4397 -- circularities involving subunits might seem too pathological to
4398 -- consider, but they were not too pathological for the authors of
4399 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4400 -- enclosing generic scopes as containing an instance.
4403 -- Within a generic subprogram body, the scope is not generic, to
4404 -- allow for recursive subprograms. Use the declaration to determine
4405 -- whether this is a generic unit.
4407 if Ekind (Scop) = E_Generic_Package
4408 or else (Is_Subprogram (Scop)
4409 and then Nkind (Unit_Declaration_Node (Scop)) =
4410 N_Generic_Subprogram_Declaration)
4412 Elmt := First_Elmt (Inner_Instances (Inner));
4414 while Present (Elmt) loop
4415 if Node (Elmt) = Scop then
4416 Error_Msg_Node_2 := Inner;
4418 ("circular Instantiation: & instantiated within &!",
4422 elsif Node (Elmt) = Inner then
4425 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4426 Error_Msg_Node_2 := Inner;
4428 ("circular Instantiation: & instantiated within &!",
4436 -- Indicate that Inner is being instantiated within Scop.
4438 Append_Elmt (Inner, Inner_Instances (Scop));
4441 if Scop = Standard_Standard then
4444 Scop := Scope (Scop);
4449 end Contains_Instance_Of;
4451 -----------------------
4452 -- Copy_Generic_Node --
4453 -----------------------
4455 function Copy_Generic_Node
4457 Parent_Id : Node_Id;
4458 Instantiating : Boolean)
4464 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4465 -- Check the given value of one of the Fields referenced by the
4466 -- current node to determine whether to copy it recursively. The
4467 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4468 -- value (Sloc, Uint, Char) in which case it need not be copied.
4470 procedure Copy_Descendants;
4471 -- Common utility for various nodes.
4473 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4474 -- Make copy of element list.
4476 function Copy_Generic_List
4478 Parent_Id : Node_Id)
4480 -- Apply Copy_Node recursively to the members of a node list.
4482 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4483 -- True if an identifier is part of the defining program unit name
4484 -- of a child unit. The entity of such an identifier must be kept
4485 -- (for ASIS use) even though as the name of an enclosing generic
4486 -- it would otherwise not be preserved in the generic tree.
4488 -----------------------
4489 -- Copy_Descendants --
4490 -----------------------
4492 procedure Copy_Descendants is
4494 use Atree.Unchecked_Access;
4495 -- This code section is part of the implementation of an untyped
4496 -- tree traversal, so it needs direct access to node fields.
4499 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4500 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4501 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4502 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4503 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4504 end Copy_Descendants;
4506 -----------------------------
4507 -- Copy_Generic_Descendant --
4508 -----------------------------
4510 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4512 if D = Union_Id (Empty) then
4515 elsif D in Node_Range then
4517 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4519 elsif D in List_Range then
4520 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4522 elsif D in Elist_Range then
4523 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4525 -- Nothing else is copyable (e.g. Uint values), return as is
4530 end Copy_Generic_Descendant;
4532 ------------------------
4533 -- Copy_Generic_Elist --
4534 ------------------------
4536 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4543 M := First_Elmt (E);
4544 while Present (M) loop
4546 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4555 end Copy_Generic_Elist;
4557 -----------------------
4558 -- Copy_Generic_List --
4559 -----------------------
4561 function Copy_Generic_List
4563 Parent_Id : Node_Id)
4572 Set_Parent (New_L, Parent_Id);
4575 while Present (N) loop
4576 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4585 end Copy_Generic_List;
4587 ---------------------------
4588 -- In_Defining_Unit_Name --
4589 ---------------------------
4591 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4593 return Present (Parent (Nam))
4594 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4596 (Nkind (Parent (Nam)) = N_Expanded_Name
4597 and then In_Defining_Unit_Name (Parent (Nam))));
4598 end In_Defining_Unit_Name;
4600 -- Start of processing for Copy_Generic_Node
4607 New_N := New_Copy (N);
4609 if Instantiating then
4610 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4613 if not Is_List_Member (N) then
4614 Set_Parent (New_N, Parent_Id);
4617 -- If defining identifier, then all fields have been copied already
4619 if Nkind (New_N) in N_Entity then
4622 -- Special casing for identifiers and other entity names and operators
4624 elsif Nkind (New_N) = N_Identifier
4625 or else Nkind (New_N) = N_Character_Literal
4626 or else Nkind (New_N) = N_Expanded_Name
4627 or else Nkind (New_N) = N_Operator_Symbol
4628 or else Nkind (New_N) in N_Op
4630 if not Instantiating then
4632 -- Link both nodes in order to assign subsequently the
4633 -- entity of the copy to the original node, in case this
4634 -- is a global reference.
4636 Set_Associated_Node (N, New_N);
4638 -- If we are within an instantiation, this is a nested generic
4639 -- that has already been analyzed at the point of definition. We
4640 -- must preserve references that were global to the enclosing
4641 -- parent at that point. Other occurrences, whether global or
4642 -- local to the current generic, must be resolved anew, so we
4643 -- reset the entity in the generic copy. A global reference has
4644 -- a smaller depth than the parent, or else the same depth in
4645 -- case both are distinct compilation units.
4647 -- It is also possible for Current_Instantiated_Parent to be
4648 -- defined, and for this not to be a nested generic, namely
4649 -- if the unit is loaded through Rtsfind. In that case, the
4650 -- entity of New_N is only a link to the associated node, and
4651 -- not a defining occurrence.
4653 -- The entities for parent units in the defining_program_unit
4654 -- of a generic child unit are established when the context of
4655 -- the unit is first analyzed, before the generic copy is made.
4656 -- They are preserved in the copy for use in ASIS queries.
4658 Ent := Entity (New_N);
4660 if No (Current_Instantiated_Parent.Gen_Id) then
4662 or else Nkind (Ent) /= N_Defining_Identifier
4663 or else not In_Defining_Unit_Name (N)
4665 Set_Associated_Node (New_N, Empty);
4670 not (Nkind (Ent) = N_Defining_Identifier
4672 Nkind (Ent) = N_Defining_Character_Literal
4674 Nkind (Ent) = N_Defining_Operator_Symbol)
4675 or else No (Scope (Ent))
4676 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4677 or else (Scope_Depth (Scope (Ent)) >
4678 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4680 Get_Source_Unit (Ent) =
4681 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4683 Set_Associated_Node (New_N, Empty);
4686 -- Case of instantiating identifier or some other name or operator
4689 -- If the associated node is still defined, the entity in
4690 -- it is global, and must be copied to the instance.
4691 -- If this copy is being made for a body to inline, it is
4692 -- applied to an instantiated tree, and the entity is already
4693 -- present and must be also preserved.
4696 Assoc : constant Node_Id := Get_Associated_Node (N);
4698 if Present (Assoc) then
4699 if Nkind (Assoc) = Nkind (N) then
4700 Set_Entity (New_N, Entity (Assoc));
4701 Check_Private_View (N);
4703 elsif Nkind (Assoc) = N_Function_Call then
4704 Set_Entity (New_N, Entity (Name (Assoc)));
4706 elsif (Nkind (Assoc) = N_Defining_Identifier
4707 or else Nkind (Assoc) = N_Defining_Character_Literal
4708 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
4709 and then Expander_Active
4711 -- Inlining case: we are copying a tree that contains
4712 -- global entities, which are preserved in the copy
4713 -- to be used for subsequent inlining.
4718 Set_Entity (New_N, Empty);
4724 -- For expanded name, we must copy the Prefix and Selector_Name
4726 if Nkind (N) = N_Expanded_Name then
4728 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4730 Set_Selector_Name (New_N,
4731 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4733 -- For operators, we must copy the right operand
4735 elsif Nkind (N) in N_Op then
4736 Set_Right_Opnd (New_N,
4737 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4739 -- And for binary operators, the left operand as well
4741 if Nkind (N) in N_Binary_Op then
4742 Set_Left_Opnd (New_N,
4743 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4747 -- Special casing for stubs
4749 elsif Nkind (N) in N_Body_Stub then
4751 -- In any case, we must copy the specification or defining
4752 -- identifier as appropriate.
4754 if Nkind (N) = N_Subprogram_Body_Stub then
4755 Set_Specification (New_N,
4756 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4759 Set_Defining_Identifier (New_N,
4761 (Defining_Identifier (N), New_N, Instantiating));
4764 -- If we are not instantiating, then this is where we load and
4765 -- analyze subunits, i.e. at the point where the stub occurs. A
4766 -- more permissivle system might defer this analysis to the point
4767 -- of instantiation, but this seems to complicated for now.
4769 if not Instantiating then
4771 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4773 Unum : Unit_Number_Type;
4779 (Load_Name => Subunit_Name,
4784 -- If the proper body is not found, a warning message will
4785 -- be emitted when analyzing the stub, or later at the the
4786 -- point of instantiation. Here we just leave the stub as is.
4788 if Unum = No_Unit then
4789 Subunits_Missing := True;
4790 goto Subunit_Not_Found;
4793 Subunit := Cunit (Unum);
4795 if Nkind (Unit (Subunit)) /= N_Subunit then
4796 Error_Msg_Sloc := Sloc (N);
4798 ("expected SEPARATE subunit to complete stub at#,"
4799 & " found child unit", Subunit);
4800 goto Subunit_Not_Found;
4803 -- We must create a generic copy of the subunit, in order
4804 -- to perform semantic analysis on it, and we must replace
4805 -- the stub in the original generic unit with the subunit,
4806 -- in order to preserve non-local references within.
4808 -- Only the proper body needs to be copied. Library_Unit and
4809 -- context clause are simply inherited by the generic copy.
4810 -- Note that the copy (which may be recursive if there are
4811 -- nested subunits) must be done first, before attaching it
4812 -- to the enclosing generic.
4816 (Proper_Body (Unit (Subunit)),
4817 Empty, Instantiating => False);
4819 -- Now place the original proper body in the original
4820 -- generic unit. This is a body, not a compilation unit.
4822 Rewrite (N, Proper_Body (Unit (Subunit)));
4823 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4824 Set_Was_Originally_Stub (N);
4826 -- Finally replace the body of the subunit with its copy,
4827 -- and make this new subunit into the library unit of the
4828 -- generic copy, which does not have stubs any longer.
4830 Set_Proper_Body (Unit (Subunit), New_Body);
4831 Set_Library_Unit (New_N, Subunit);
4832 Inherit_Context (Unit (Subunit), N);
4835 -- If we are instantiating, this must be an error case, since
4836 -- otherwise we would have replaced the stub node by the proper
4837 -- body that corresponds. So just ignore it in the copy (i.e.
4838 -- we have copied it, and that is good enough).
4844 <<Subunit_Not_Found>> null;
4846 -- If the node is a compilation unit, it is the subunit of a stub,
4847 -- which has been loaded already (see code below). In this case,
4848 -- the library unit field of N points to the parent unit (which
4849 -- is a compilation unit) and need not (and cannot!) be copied.
4851 -- When the proper body of the stub is analyzed, thie library_unit
4852 -- link is used to establish the proper context (see sem_ch10).
4854 -- The other fields of a compilation unit are copied as usual
4856 elsif Nkind (N) = N_Compilation_Unit then
4858 -- This code can only be executed when not instantiating, because
4859 -- in the copy made for an instantiation, the compilation unit
4860 -- node has disappeared at the point that a stub is replaced by
4863 pragma Assert (not Instantiating);
4865 Set_Context_Items (New_N,
4866 Copy_Generic_List (Context_Items (N), New_N));
4869 Copy_Generic_Node (Unit (N), New_N, False));
4871 Set_First_Inlined_Subprogram (New_N,
4873 (First_Inlined_Subprogram (N), New_N, False));
4875 Set_Aux_Decls_Node (New_N,
4876 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4878 -- For an assignment node, the assignment is known to be semantically
4879 -- legal if we are instantiating the template. This avoids incorrect
4880 -- diagnostics in generated code.
4882 elsif Nkind (N) = N_Assignment_Statement then
4884 -- Copy name and expression fields in usual manner
4887 Copy_Generic_Node (Name (N), New_N, Instantiating));
4889 Set_Expression (New_N,
4890 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4892 if Instantiating then
4893 Set_Assignment_OK (Name (New_N), True);
4896 elsif Nkind (N) = N_Aggregate
4897 or else Nkind (N) = N_Extension_Aggregate
4900 if not Instantiating then
4901 Set_Associated_Node (N, New_N);
4904 if Present (Get_Associated_Node (N))
4905 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4907 -- In the generic the aggregate has some composite type. If at
4908 -- the point of instantiation the type has a private view,
4909 -- install the full view (and that of its ancestors, if any).
4912 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4917 and then Is_Private_Type (T)
4923 and then Is_Tagged_Type (T)
4924 and then Is_Derived_Type (T)
4926 Rt := Root_Type (T);
4931 if Is_Private_Type (T) then
4942 -- Do not copy the associated node, which points to
4943 -- the generic copy of the aggregate.
4946 use Atree.Unchecked_Access;
4947 -- This code section is part of the implementation of an untyped
4948 -- tree traversal, so it needs direct access to node fields.
4951 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4952 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4953 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4954 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4957 -- Allocators do not have an identifier denoting the access type,
4958 -- so we must locate it through the expression to check whether
4959 -- the views are consistent.
4961 elsif Nkind (N) = N_Allocator
4962 and then Nkind (Expression (N)) = N_Qualified_Expression
4963 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
4964 and then Instantiating
4967 T : constant Node_Id :=
4968 Get_Associated_Node (Subtype_Mark (Expression (N)));
4973 -- Retrieve the allocator node in the generic copy.
4975 Acc_T := Etype (Parent (Parent (T)));
4977 and then Is_Private_Type (Acc_T)
4979 Switch_View (Acc_T);
4986 -- For a proper body, we must catch the case of a proper body that
4987 -- replaces a stub. This represents the point at which a separate
4988 -- compilation unit, and hence template file, may be referenced, so
4989 -- we must make a new source instantiation entry for the template
4990 -- of the subunit, and ensure that all nodes in the subunit are
4991 -- adjusted using this new source instantiation entry.
4993 elsif Nkind (N) in N_Proper_Body then
4995 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4998 if Instantiating and then Was_Originally_Stub (N) then
4999 Create_Instantiation_Source
5000 (Instantiation_Node,
5001 Defining_Entity (N),
5006 -- Now copy the fields of the proper body, using the new
5007 -- adjustment factor if one was needed as per test above.
5011 -- Restore the original adjustment factor in case changed
5013 S_Adjustment := Save_Adjustment;
5016 -- Don't copy Ident or Comment pragmas, since the comment belongs
5017 -- to the generic unit, not to the instantiating unit.
5019 elsif Nkind (N) = N_Pragma
5020 and then Instantiating
5023 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
5026 if Prag_Id = Pragma_Ident
5027 or else Prag_Id = Pragma_Comment
5029 New_N := Make_Null_Statement (Sloc (N));
5036 elsif Nkind (N) = N_Integer_Literal
5037 or else Nkind (N) = N_Real_Literal
5039 -- No descendant fields need traversing
5043 -- For the remaining nodes, copy recursively their descendants
5049 and then Nkind (N) = N_Subprogram_Body
5051 Set_Generic_Parent (Specification (New_N), N);
5056 end Copy_Generic_Node;
5058 ----------------------------
5059 -- Denotes_Formal_Package --
5060 ----------------------------
5062 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
5063 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
5064 Scop : constant Entity_Id := Scope (Pack);
5068 if Ekind (Scop) = E_Generic_Package
5069 or else Nkind (Unit_Declaration_Node (Scop)) =
5070 N_Generic_Subprogram_Declaration
5074 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
5081 -- Check whether this package is associated with a formal
5082 -- package of the enclosing instantiation. Iterate over the
5083 -- list of renamings.
5085 E := First_Entity (Par);
5086 while Present (E) loop
5087 if Ekind (E) /= E_Package
5088 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
5091 elsif Renamed_Object (E) = Par then
5094 elsif Renamed_Object (E) = Pack then
5103 end Denotes_Formal_Package;
5109 procedure End_Generic is
5111 -- ??? More things could be factored out in this
5112 -- routine. Should probably be done at a later stage.
5114 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
5115 Generic_Flags.Decrement_Last;
5117 Expander_Mode_Restore;
5120 ----------------------
5121 -- Find_Actual_Type --
5122 ----------------------
5124 function Find_Actual_Type
5126 Gen_Scope : Entity_Id)
5132 if not Is_Child_Unit (Gen_Scope) then
5133 return Get_Instance_Of (Typ);
5135 elsif not Is_Generic_Type (Typ)
5136 or else Scope (Typ) = Gen_Scope
5138 return Get_Instance_Of (Typ);
5141 T := Current_Entity (Typ);
5142 while Present (T) loop
5143 if In_Open_Scopes (Scope (T)) then
5152 end Find_Actual_Type;
5154 ----------------------------
5155 -- Freeze_Subprogram_Body --
5156 ----------------------------
5158 procedure Freeze_Subprogram_Body
5159 (Inst_Node : Node_Id;
5161 Pack_Id : Entity_Id)
5164 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
5165 Par : constant Entity_Id := Scope (Gen_Unit);
5170 function Earlier (N1, N2 : Node_Id) return Boolean;
5171 -- Yields True if N1 and N2 appear in the same compilation unit,
5172 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5173 -- traversal of the tree for the unit.
5175 function Enclosing_Body (N : Node_Id) return Node_Id;
5176 -- Find innermost package body that encloses the given node, and which
5177 -- is not a compilation unit. Freeze nodes for the instance, or for its
5178 -- enclosing body, may be inserted after the enclosing_body of the
5181 function Package_Freeze_Node (B : Node_Id) return Node_Id;
5182 -- Find entity for given package body, and locate or create a freeze
5185 function True_Parent (N : Node_Id) return Node_Id;
5186 -- For a subunit, return parent of corresponding stub.
5192 function Earlier (N1, N2 : Node_Id) return Boolean is
5198 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
5199 -- Find distance from given node to enclosing compilation unit.
5205 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
5208 and then Nkind (P) /= N_Compilation_Unit
5210 P := True_Parent (P);
5215 -- Start of procesing for Earlier
5218 Find_Depth (P1, D1);
5219 Find_Depth (P2, D2);
5229 P1 := True_Parent (P1);
5234 P2 := True_Parent (P2);
5238 -- At this point P1 and P2 are at the same distance from the root.
5239 -- We examine their parents until we find a common declarative
5240 -- list, at which point we can establish their relative placement
5241 -- by comparing their ultimate slocs. If we reach the root,
5242 -- N1 and N2 do not descend from the same declarative list (e.g.
5243 -- one is nested in the declarative part and the other is in a block
5244 -- in the statement part) and the earlier one is already frozen.
5246 while not Is_List_Member (P1)
5247 or else not Is_List_Member (P2)
5248 or else List_Containing (P1) /= List_Containing (P2)
5250 P1 := True_Parent (P1);
5251 P2 := True_Parent (P2);
5253 if Nkind (Parent (P1)) = N_Subunit then
5254 P1 := Corresponding_Stub (Parent (P1));
5257 if Nkind (Parent (P2)) = N_Subunit then
5258 P2 := Corresponding_Stub (Parent (P2));
5267 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
5270 --------------------
5271 -- Enclosing_Body --
5272 --------------------
5274 function Enclosing_Body (N : Node_Id) return Node_Id is
5275 P : Node_Id := Parent (N);
5279 and then Nkind (Parent (P)) /= N_Compilation_Unit
5281 if Nkind (P) = N_Package_Body then
5283 if Nkind (Parent (P)) = N_Subunit then
5284 return Corresponding_Stub (Parent (P));
5290 P := True_Parent (P);
5296 -------------------------
5297 -- Package_Freeze_Node --
5298 -------------------------
5300 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5304 if Nkind (B) = N_Package_Body then
5305 Id := Corresponding_Spec (B);
5307 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5308 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5311 Ensure_Freeze_Node (Id);
5312 return Freeze_Node (Id);
5313 end Package_Freeze_Node;
5319 function True_Parent (N : Node_Id) return Node_Id is
5321 if Nkind (Parent (N)) = N_Subunit then
5322 return Parent (Corresponding_Stub (Parent (N)));
5328 -- Start of processing of Freeze_Subprogram_Body
5331 -- If the instance and the generic body appear within the same
5332 -- unit, and the instance preceeds the generic, the freeze node for
5333 -- the instance must appear after that of the generic. If the generic
5334 -- is nested within another instance I2, then current instance must
5335 -- be frozen after I2. In both cases, the freeze nodes are those of
5336 -- enclosing packages. Otherwise, the freeze node is placed at the end
5337 -- of the current declarative part.
5339 Enc_G := Enclosing_Body (Gen_Body);
5340 Enc_I := Enclosing_Body (Inst_Node);
5341 Ensure_Freeze_Node (Pack_Id);
5342 F_Node := Freeze_Node (Pack_Id);
5344 if Is_Generic_Instance (Par)
5345 and then Present (Freeze_Node (Par))
5347 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5349 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5351 -- The parent was a premature instantiation. Insert freeze
5352 -- node at the end the current declarative part.
5354 Insert_After_Last_Decl (Inst_Node, F_Node);
5357 Insert_After (Freeze_Node (Par), F_Node);
5360 -- The body enclosing the instance should be frozen after the body
5361 -- that includes the generic, because the body of the instance may
5362 -- make references to entities therein. If the two are not in the
5363 -- same declarative part, or if the one enclosing the instance is
5364 -- frozen already, freeze the instance at the end of the current
5365 -- declarative part.
5367 elsif Is_Generic_Instance (Par)
5368 and then Present (Freeze_Node (Par))
5369 and then Present (Enc_I)
5371 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5373 (Nkind (Enc_I) = N_Package_Body
5375 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5377 -- The enclosing package may contain several instances. Rather
5378 -- than computing the earliest point at which to insert its
5379 -- freeze node, we place it at the end of the declarative part
5380 -- of the parent of the generic.
5382 Insert_After_Last_Decl
5383 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5386 Insert_After_Last_Decl (Inst_Node, F_Node);
5388 elsif Present (Enc_G)
5389 and then Present (Enc_I)
5390 and then Enc_G /= Enc_I
5391 and then Earlier (Inst_Node, Gen_Body)
5393 if Nkind (Enc_G) = N_Package_Body then
5394 E_G_Id := Corresponding_Spec (Enc_G);
5395 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5397 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5400 -- Freeze package that encloses instance, and place node after
5401 -- package that encloses generic. If enclosing package is already
5402 -- frozen we have to assume it is at the proper place. This may
5403 -- be a potential ABE that requires dynamic checking.
5405 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5407 -- Freeze enclosing subunit before instance
5409 Ensure_Freeze_Node (E_G_Id);
5411 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5412 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5415 Insert_After_Last_Decl (Inst_Node, F_Node);
5418 -- If none of the above, insert freeze node at the end of the
5419 -- current declarative part.
5421 Insert_After_Last_Decl (Inst_Node, F_Node);
5423 end Freeze_Subprogram_Body;
5429 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5431 return Generic_Renamings.Table (E).Gen_Id;
5434 ---------------------
5435 -- Get_Instance_Of --
5436 ---------------------
5438 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5439 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5442 if Res /= Assoc_Null then
5443 return Generic_Renamings.Table (Res).Act_Id;
5445 -- On exit, entity is not instantiated: not a generic parameter,
5446 -- or else parameter of an inner generic unit.
5450 end Get_Instance_Of;
5452 ------------------------------------
5453 -- Get_Package_Instantiation_Node --
5454 ------------------------------------
5456 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5457 Decl : Node_Id := Unit_Declaration_Node (A);
5461 -- If the instantiation is a compilation unit that does not need a
5462 -- body then the instantiation node has been rewritten as a package
5463 -- declaration for the instance, and we return the original node.
5465 -- If it is a compilation unit and the instance node has not been
5466 -- rewritten, then it is still the unit of the compilation. Finally,
5467 -- if a body is present, this is a parent of the main unit whose body
5468 -- has been compiled for inlining purposes, and the instantiation node
5469 -- has been rewritten with the instance body.
5471 -- Otherwise the instantiation node appears after the declaration.
5472 -- If the entity is a formal package, the declaration may have been
5473 -- rewritten as a generic declaration (in the case of a formal with a
5474 -- box) or left as a formal package declaration if it has actuals, and
5475 -- is found with a forward search.
5477 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5478 if Nkind (Decl) = N_Package_Declaration
5479 and then Present (Corresponding_Body (Decl))
5481 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5484 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5485 return Original_Node (Decl);
5487 return Unit (Parent (Decl));
5490 elsif Nkind (Decl) = N_Generic_Package_Declaration
5491 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5493 return Original_Node (Decl);
5496 Inst := Next (Decl);
5497 while Nkind (Inst) /= N_Package_Instantiation
5498 and then Nkind (Inst) /= N_Formal_Package_Declaration
5505 end Get_Package_Instantiation_Node;
5507 ------------------------
5508 -- Has_Been_Exchanged --
5509 ------------------------
5511 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5512 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5515 while Present (Next) loop
5516 if Full_View (Node (Next)) = E then
5524 end Has_Been_Exchanged;
5530 function Hash (F : Entity_Id) return HTable_Range is
5532 return HTable_Range (F mod HTable_Size);
5535 ------------------------
5536 -- Hide_Current_Scope --
5537 ------------------------
5539 procedure Hide_Current_Scope is
5540 C : constant Entity_Id := Current_Scope;
5544 Set_Is_Hidden_Open_Scope (C);
5545 E := First_Entity (C);
5547 while Present (E) loop
5548 if Is_Immediately_Visible (E) then
5549 Set_Is_Immediately_Visible (E, False);
5550 Append_Elmt (E, Hidden_Entities);
5556 -- Make the scope name invisible as well. This is necessary, but
5557 -- might conflict with calls to Rtsfind later on, in case the scope
5558 -- is a predefined one. There is no clean solution to this problem, so
5559 -- for now we depend on the user not redefining Standard itself in one
5560 -- of the parent units.
5562 if Is_Immediately_Visible (C)
5563 and then C /= Standard_Standard
5565 Set_Is_Immediately_Visible (C, False);
5566 Append_Elmt (C, Hidden_Entities);
5569 end Hide_Current_Scope;
5575 procedure Init_Env is
5576 Saved : Instance_Env;
5579 Saved.Ada_83 := Ada_83;
5580 Saved.Instantiated_Parent := Current_Instantiated_Parent;
5581 Saved.Exchanged_Views := Exchanged_Views;
5582 Saved.Hidden_Entities := Hidden_Entities;
5583 Saved.Current_Sem_Unit := Current_Sem_Unit;
5584 Instance_Envs.Increment_Last;
5585 Instance_Envs.Table (Instance_Envs.Last) := Saved;
5587 Exchanged_Views := New_Elmt_List;
5588 Hidden_Entities := New_Elmt_List;
5590 -- Make dummy entry for Instantiated parent. If generic unit is
5591 -- legal, this is set properly in Set_Instance_Env.
5593 Current_Instantiated_Parent :=
5594 (Current_Scope, Current_Scope, Assoc_Null);
5597 ------------------------------
5598 -- In_Same_Declarative_Part --
5599 ------------------------------
5601 function In_Same_Declarative_Part
5606 Decls : constant Node_Id := Parent (F_Node);
5607 Nod : Node_Id := Parent (Inst);
5610 while Present (Nod) loop
5614 elsif Nkind (Nod) = N_Subprogram_Body
5615 or else Nkind (Nod) = N_Package_Body
5616 or else Nkind (Nod) = N_Task_Body
5617 or else Nkind (Nod) = N_Protected_Body
5618 or else Nkind (Nod) = N_Block_Statement
5622 elsif Nkind (Nod) = N_Subunit then
5623 Nod := Corresponding_Stub (Nod);
5625 elsif Nkind (Nod) = N_Compilation_Unit then
5628 Nod := Parent (Nod);
5633 end In_Same_Declarative_Part;
5635 ---------------------
5636 -- Inherit_Context --
5637 ---------------------
5639 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5640 Current_Context : List_Id;
5641 Current_Unit : Node_Id;
5646 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5648 -- The inherited context is attached to the enclosing compilation
5649 -- unit. This is either the main unit, or the declaration for the
5650 -- main unit (in case the instantation appears within the package
5651 -- declaration and the main unit is its body).
5653 Current_Unit := Parent (Inst);
5654 while Present (Current_Unit)
5655 and then Nkind (Current_Unit) /= N_Compilation_Unit
5657 Current_Unit := Parent (Current_Unit);
5660 Current_Context := Context_Items (Current_Unit);
5662 Item := First (Context_Items (Parent (Gen_Decl)));
5663 while Present (Item) loop
5664 if Nkind (Item) = N_With_Clause then
5665 New_I := New_Copy (Item);
5666 Set_Implicit_With (New_I, True);
5667 Append (New_I, Current_Context);
5673 end Inherit_Context;
5679 procedure Initialize is
5681 Generic_Renamings.Init;
5684 Generic_Renamings_HTable.Reset;
5685 Circularity_Detected := False;
5686 Exchanged_Views := No_Elist;
5687 Hidden_Entities := No_Elist;
5690 ----------------------------
5691 -- Insert_After_Last_Decl --
5692 ----------------------------
5694 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5695 L : List_Id := List_Containing (N);
5696 P : constant Node_Id := Parent (L);
5699 if not Is_List_Member (F_Node) then
5700 if Nkind (P) = N_Package_Specification
5701 and then L = Visible_Declarations (P)
5702 and then Present (Private_Declarations (P))
5703 and then not Is_Empty_List (Private_Declarations (P))
5705 L := Private_Declarations (P);
5708 Insert_After (Last (L), F_Node);
5710 end Insert_After_Last_Decl;
5716 procedure Install_Body
5717 (Act_Body : Node_Id;
5722 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
5723 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
5724 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
5725 Par : constant Entity_Id := Scope (Gen_Id);
5726 Gen_Unit : constant Node_Id :=
5727 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5728 Orig_Body : Node_Id := Gen_Body;
5730 Body_Unit : Node_Id;
5732 Must_Delay : Boolean;
5734 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5735 -- Find subprogram (if any) that encloses instance and/or generic body.
5737 function True_Sloc (N : Node_Id) return Source_Ptr;
5738 -- If the instance is nested inside a generic unit, the Sloc of the
5739 -- instance indicates the place of the original definition, not the
5740 -- point of the current enclosing instance. Pending a better usage of
5741 -- Slocs to indicate instantiation places, we determine the place of
5742 -- origin of a node by finding the maximum sloc of any ancestor node.
5743 -- Why is this not equivalent fo Top_Level_Location ???
5745 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5746 Scop : Entity_Id := Scope (Id);
5749 while Scop /= Standard_Standard
5750 and then not Is_Overloadable (Scop)
5752 Scop := Scope (Scop);
5758 function True_Sloc (N : Node_Id) return Source_Ptr is
5765 while Present (N1) and then N1 /= Act_Unit loop
5766 if Sloc (N1) > Res then
5776 -- Start of processing for Install_Body
5779 -- If the body is a subunit, the freeze point is the corresponding
5780 -- stub in the current compilation, not the subunit itself.
5782 if Nkind (Parent (Gen_Body)) = N_Subunit then
5783 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5785 Orig_Body := Gen_Body;
5788 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5790 -- If the instantiation and the generic definition appear in the
5791 -- same package declaration, this is an early instantiation.
5792 -- If they appear in the same declarative part, it is an early
5793 -- instantiation only if the generic body appears textually later,
5794 -- and the generic body is also in the main unit.
5796 -- If instance is nested within a subprogram, and the generic body is
5797 -- not, the instance is delayed because the enclosing body is. If
5798 -- instance and body are within the same scope, or the same sub-
5799 -- program body, indicate explicitly that the instance is delayed.
5802 (Gen_Unit = Act_Unit
5803 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5804 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5805 or else (Gen_Unit = Body_Unit
5806 and then True_Sloc (N) < Sloc (Orig_Body)))
5807 and then Is_In_Main_Unit (Gen_Unit)
5808 and then (Scope (Act_Id) = Scope (Gen_Id)
5810 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5812 -- If this is an early instantiation, the freeze node is placed after
5813 -- the generic body. Otherwise, if the generic appears in an instance,
5814 -- we cannot freeze the current instance until the outer one is frozen.
5815 -- This is only relevant if the current instance is nested within some
5816 -- inner scope not itself within the outer instance. If this scope is
5817 -- a package body in the same declarative part as the outer instance,
5818 -- then that body needs to be frozen after the outer instance. Finally,
5819 -- if no delay is needed, we place the freeze node at the end of the
5820 -- current declarative part.
5822 if Expander_Active then
5823 Ensure_Freeze_Node (Act_Id);
5824 F_Node := Freeze_Node (Act_Id);
5827 Insert_After (Orig_Body, F_Node);
5829 elsif Is_Generic_Instance (Par)
5830 and then Present (Freeze_Node (Par))
5831 and then Scope (Act_Id) /= Par
5833 -- Freeze instance of inner generic after instance of enclosing
5836 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5837 Insert_After (Freeze_Node (Par), F_Node);
5839 -- Freeze package enclosing instance of inner generic after
5840 -- instance of enclosing generic.
5842 elsif Nkind (Parent (N)) = N_Package_Body
5843 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5847 Enclosing : constant Entity_Id :=
5848 Corresponding_Spec (Parent (N));
5851 Insert_After_Last_Decl (N, F_Node);
5852 Ensure_Freeze_Node (Enclosing);
5854 if not Is_List_Member (Freeze_Node (Enclosing)) then
5855 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5860 Insert_After_Last_Decl (N, F_Node);
5864 Insert_After_Last_Decl (N, F_Node);
5868 Set_Is_Frozen (Act_Id);
5869 Insert_Before (N, Act_Body);
5870 Mark_Rewrite_Insertion (Act_Body);
5873 --------------------
5874 -- Install_Parent --
5875 --------------------
5877 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5878 Ancestors : constant Elist_Id := New_Elmt_List;
5879 S : constant Entity_Id := Current_Scope;
5880 Inst_Par : Entity_Id;
5881 First_Par : Entity_Id;
5882 Inst_Node : Node_Id;
5883 Gen_Par : Entity_Id;
5884 First_Gen : Entity_Id;
5887 procedure Install_Formal_Packages (Par : Entity_Id);
5888 -- If any of the formals of the parent are formal packages with box,
5889 -- their formal parts are visible in the parent and thus in the child
5890 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5891 -- for the unit itself.
5893 procedure Install_Noninstance_Specs (Par : Entity_Id);
5894 -- Install the scopes of noninstance parent units ending with Par.
5896 procedure Install_Spec (Par : Entity_Id);
5897 -- The child unit is within the declarative part of the parent, so
5898 -- the declarations within the parent are immediately visible.
5900 -----------------------------
5901 -- Install_Formal_Packages --
5902 -----------------------------
5904 procedure Install_Formal_Packages (Par : Entity_Id) is
5908 E := First_Entity (Par);
5910 while Present (E) loop
5912 if Ekind (E) = E_Package
5913 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5915 -- If this is the renaming for the parent instance, done.
5917 if Renamed_Object (E) = Par then
5920 -- The visibility of a formal of an enclosing generic is
5923 elsif Denotes_Formal_Package (E) then
5926 elsif Present (Associated_Formal_Package (E))
5927 and then Box_Present (Parent (Associated_Formal_Package (E)))
5929 Check_Generic_Actuals (Renamed_Object (E), True);
5930 Set_Is_Hidden (E, False);
5936 end Install_Formal_Packages;
5938 -------------------------------
5939 -- Install_Noninstance_Specs --
5940 -------------------------------
5942 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5945 and then Par /= Standard_Standard
5946 and then not In_Open_Scopes (Par)
5948 Install_Noninstance_Specs (Scope (Par));
5951 end Install_Noninstance_Specs;
5957 procedure Install_Spec (Par : Entity_Id) is
5958 Spec : constant Node_Id :=
5959 Specification (Unit_Declaration_Node (Par));
5963 Set_Is_Immediately_Visible (Par);
5964 Install_Visible_Declarations (Par);
5965 Install_Private_Declarations (Par);
5966 Set_Use (Visible_Declarations (Spec));
5967 Set_Use (Private_Declarations (Spec));
5970 -- Start of processing for Install_Parent
5973 -- We need to install the parent instance to compile the instantiation
5974 -- of the child, but the child instance must appear in the current
5975 -- scope. Given that we cannot place the parent above the current
5976 -- scope in the scope stack, we duplicate the current scope and unstack
5977 -- both after the instantiation is complete.
5979 -- If the parent is itself the instantiation of a child unit, we must
5980 -- also stack the instantiation of its parent, and so on. Each such
5981 -- ancestor is the prefix of the name in a prior instantiation.
5983 -- If this is a nested instance, the parent unit itself resolves to
5984 -- a renaming of the parent instance, whose declaration we need.
5986 -- Finally, the parent may be a generic (not an instance) when the
5987 -- child unit appears as a formal package.
5991 if Present (Renamed_Entity (Inst_Par)) then
5992 Inst_Par := Renamed_Entity (Inst_Par);
5995 First_Par := Inst_Par;
5998 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
6000 First_Gen := Gen_Par;
6002 while Present (Gen_Par)
6003 and then Is_Child_Unit (Gen_Par)
6005 -- Load grandparent instance as well
6007 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
6009 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
6010 Inst_Par := Entity (Prefix (Name (Inst_Node)));
6012 if Present (Renamed_Entity (Inst_Par)) then
6013 Inst_Par := Renamed_Entity (Inst_Par);
6018 (Specification (Unit_Declaration_Node (Inst_Par)));
6020 if Present (Gen_Par) then
6021 Prepend_Elmt (Inst_Par, Ancestors);
6024 -- Parent is not the name of an instantiation
6026 Install_Noninstance_Specs (Inst_Par);
6038 if Present (First_Gen) then
6039 Append_Elmt (First_Par, Ancestors);
6042 Install_Noninstance_Specs (First_Par);
6045 if not Is_Empty_Elmt_List (Ancestors) then
6046 Elmt := First_Elmt (Ancestors);
6048 while Present (Elmt) loop
6049 Install_Spec (Node (Elmt));
6050 Install_Formal_Packages (Node (Elmt));
6061 --------------------------------
6062 -- Instantiate_Formal_Package --
6063 --------------------------------
6065 function Instantiate_Formal_Package
6068 Analyzed_Formal : Node_Id)
6071 Loc : constant Source_Ptr := Sloc (Actual);
6072 Actual_Pack : Entity_Id;
6073 Formal_Pack : Entity_Id;
6074 Gen_Parent : Entity_Id;
6077 Parent_Spec : Node_Id;
6079 procedure Find_Matching_Actual
6081 Act : in out Entity_Id);
6082 -- We need to associate each formal entity in the formal package
6083 -- with the corresponding entity in the actual package. The actual
6084 -- package has been analyzed and possibly expanded, and as a result
6085 -- there is no one-to-one correspondence between the two lists (for
6086 -- example, the actual may include subtypes, itypes, and inherited
6087 -- primitive operations, interspersed among the renaming declarations
6088 -- for the actuals) . We retrieve the corresponding actual by name
6089 -- because each actual has the same name as the formal, and they do
6090 -- appear in the same order.
6092 function Formal_Entity
6094 Act_Ent : Entity_Id)
6096 -- Returns the entity associated with the given formal F. In the
6097 -- case where F is a formal package, this function will iterate
6098 -- through all of F's formals and enter map associations from the
6099 -- actuals occurring in the formal package's corresponding actual
6100 -- package (obtained via Act_Ent) to the formal package's formal
6101 -- parameters. This function is called recursively for arbitrary
6102 -- levels of formal packages.
6104 function Is_Instance_Of
6105 (Act_Spec : Entity_Id;
6106 Gen_Anc : Entity_Id)
6108 -- The actual can be an instantiation of a generic within another
6109 -- instance, in which case there is no direct link from it to the
6110 -- original generic ancestor. In that case, we recognize that the
6111 -- ultimate ancestor is the same by examining names and scopes.
6113 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
6114 -- Within the generic part, entities in the formal package are
6115 -- visible. To validate subsequent type declarations, indicate
6116 -- the correspondence betwen the entities in the analyzed formal,
6117 -- and the entities in the actual package. There are three packages
6118 -- involved in the instantiation of a formal package: the parent
6119 -- generic P1 which appears in the generic declaration, the fake
6120 -- instantiation P2 which appears in the analyzed generic, and whose
6121 -- visible entities may be used in subsequent formals, and the actual
6122 -- P3 in the instance. To validate subsequent formals, me indicate
6123 -- that the entities in P2 are mapped into those of P3. The mapping of
6124 -- entities has to be done recursively for nested packages.
6126 --------------------------
6127 -- Find_Matching_Actual --
6128 --------------------------
6130 procedure Find_Matching_Actual
6132 Act : in out Entity_Id)
6134 Formal_Ent : Entity_Id;
6137 case Nkind (Original_Node (F)) is
6138 when N_Formal_Object_Declaration |
6139 N_Formal_Type_Declaration =>
6140 Formal_Ent := Defining_Identifier (F);
6142 while Chars (Act) /= Chars (Formal_Ent) loop
6146 when N_Formal_Subprogram_Declaration |
6147 N_Formal_Package_Declaration |
6148 N_Package_Declaration |
6149 N_Generic_Package_Declaration =>
6150 Formal_Ent := Defining_Entity (F);
6152 while Chars (Act) /= Chars (Formal_Ent) loop
6158 pragma Assert (False);
6160 end Find_Matching_Actual;
6166 function Formal_Entity
6168 Act_Ent : Entity_Id)
6171 Orig_Node : Node_Id := F;
6172 Act_Pkg : Entity_Id;
6175 case Nkind (Original_Node (F)) is
6176 when N_Formal_Object_Declaration =>
6177 return Defining_Identifier (F);
6179 when N_Formal_Type_Declaration =>
6180 return Defining_Identifier (F);
6182 when N_Formal_Subprogram_Declaration =>
6183 return Defining_Unit_Name (Specification (F));
6185 when N_Package_Declaration =>
6186 return Defining_Unit_Name (Specification (F));
6188 when N_Formal_Package_Declaration |
6189 N_Generic_Package_Declaration =>
6191 if Nkind (F) = N_Generic_Package_Declaration then
6192 Orig_Node := Original_Node (F);
6197 -- Find matching actual package, skipping over itypes and
6198 -- other entities generated when analyzing the formal. We
6199 -- know that if the instantiation is legal then there is
6200 -- a matching package for the formal.
6202 while Ekind (Act_Pkg) /= E_Package loop
6203 Act_Pkg := Next_Entity (Act_Pkg);
6207 Actual_Ent : Entity_Id := First_Entity (Act_Pkg);
6208 Formal_Node : Node_Id;
6209 Formal_Ent : Entity_Id;
6211 Gen_Decl : constant Node_Id :=
6212 Unit_Declaration_Node
6213 (Entity (Name (Orig_Node)));
6215 Formals : constant List_Id :=
6216 Generic_Formal_Declarations (Gen_Decl);
6219 if Present (Formals) then
6220 Formal_Node := First_Non_Pragma (Formals);
6222 Formal_Node := Empty;
6225 while Present (Actual_Ent)
6226 and then Present (Formal_Node)
6227 and then Actual_Ent /= First_Private_Entity (Act_Ent)
6229 -- ??? Are the following calls also needed here:
6231 -- Set_Is_Hidden (Actual_Ent, False);
6232 -- Set_Is_Potentially_Use_Visible
6233 -- (Actual_Ent, In_Use (Act_Ent));
6235 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6236 if Present (Formal_Ent) then
6237 Set_Instance_Of (Formal_Ent, Actual_Ent);
6239 Next_Non_Pragma (Formal_Node);
6241 Next_Entity (Actual_Ent);
6245 return Defining_Identifier (Orig_Node);
6247 when N_Use_Package_Clause =>
6250 when N_Use_Type_Clause =>
6253 -- We return Empty for all other encountered forms of
6254 -- declarations because there are some cases of nonformal
6255 -- sorts of declaration that can show up (e.g., when array
6256 -- formals are present). Since it's not clear what kinds
6257 -- can appear among the formals, we won't raise failure here.
6265 --------------------
6266 -- Is_Instance_Of --
6267 --------------------
6269 function Is_Instance_Of
6270 (Act_Spec : Entity_Id;
6271 Gen_Anc : Entity_Id)
6274 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
6277 if No (Gen_Par) then
6280 -- Simplest case: the generic parent of the actual is the formal.
6282 elsif Gen_Par = Gen_Anc then
6285 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
6288 -- The actual may be obtained through several instantiations. Its
6289 -- scope must itself be an instance of a generic declared in the
6290 -- same scope as the formal. Any other case is detected above.
6292 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
6296 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
6304 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
6309 Set_Instance_Of (Form, Act);
6311 -- Traverse formal and actual package to map the corresponding
6312 -- entities. We skip over internal entities that may be generated
6313 -- during semantic analysis, and find the matching entities by
6314 -- name, given that they must appear in the same order.
6316 E1 := First_Entity (Form);
6317 E2 := First_Entity (Act);
6319 and then E1 /= First_Private_Entity (Form)
6321 if not Is_Internal (E1)
6322 and then not Is_Class_Wide_Type (E1)
6323 and then Present (Parent (E1))
6326 and then Chars (E2) /= Chars (E1)
6334 Set_Instance_Of (E1, E2);
6337 and then Is_Tagged_Type (E2)
6340 (Class_Wide_Type (E1), Class_Wide_Type (E2));
6343 if Ekind (E1) = E_Package
6344 and then No (Renamed_Object (E1))
6346 Map_Entities (E1, E2);
6355 -- Start of processing for Instantiate_Formal_Package
6360 if not Is_Entity_Name (Actual)
6361 or else Ekind (Entity (Actual)) /= E_Package
6364 ("expect package instance to instantiate formal", Actual);
6365 Abandon_Instantiation (Actual);
6366 raise Program_Error;
6369 Actual_Pack := Entity (Actual);
6370 Set_Is_Instantiated (Actual_Pack);
6372 -- The actual may be a renamed package, or an outer generic
6373 -- formal package whose instantiation is converted into a renaming.
6375 if Present (Renamed_Object (Actual_Pack)) then
6376 Actual_Pack := Renamed_Object (Actual_Pack);
6379 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
6380 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
6381 Formal_Pack := Defining_Identifier (Analyzed_Formal);
6384 Generic_Parent (Specification (Analyzed_Formal));
6386 Defining_Unit_Name (Specification (Analyzed_Formal));
6389 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
6390 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
6392 Parent_Spec := Parent (Actual_Pack);
6395 if Gen_Parent = Any_Id then
6397 ("previous error in declaration of formal package", Actual);
6398 Abandon_Instantiation (Actual);
6401 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
6407 ("actual parameter must be instance of&", Actual, Gen_Parent);
6408 Abandon_Instantiation (Actual);
6411 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
6412 Map_Entities (Formal_Pack, Actual_Pack);
6415 Make_Package_Renaming_Declaration (Loc,
6416 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
6417 Name => New_Reference_To (Actual_Pack, Loc));
6419 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
6420 Defining_Identifier (Formal));
6421 Decls := New_List (Nod);
6423 -- If the formal F has a box, then the generic declarations are
6424 -- visible in the generic G. In an instance of G, the corresponding
6425 -- entities in the actual for F (which are the actuals for the
6426 -- instantiation of the generic that F denotes) must also be made
6427 -- visible for analysis of the current instance. On exit from the
6428 -- current instance, those entities are made private again. If the
6429 -- actual is currently in use, these entities are also use-visible.
6431 -- The loop through the actual entities also steps through the
6432 -- formal entities and enters associations from formals to
6433 -- actuals into the renaming map. This is necessary to properly
6434 -- handle checking of actual parameter associations for later
6435 -- formals that depend on actuals declared in the formal package.
6437 if Box_Present (Formal) then
6439 Gen_Decl : constant Node_Id :=
6440 Unit_Declaration_Node (Gen_Parent);
6441 Formals : constant List_Id :=
6442 Generic_Formal_Declarations (Gen_Decl);
6443 Actual_Ent : Entity_Id;
6444 Formal_Node : Node_Id;
6445 Formal_Ent : Entity_Id;
6448 if Present (Formals) then
6449 Formal_Node := First_Non_Pragma (Formals);
6451 Formal_Node := Empty;
6454 Actual_Ent := First_Entity (Actual_Pack);
6456 while Present (Actual_Ent)
6457 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6459 Set_Is_Hidden (Actual_Ent, False);
6460 Set_Is_Potentially_Use_Visible
6461 (Actual_Ent, In_Use (Actual_Pack));
6463 if Present (Formal_Node) then
6464 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6466 if Present (Formal_Ent) then
6467 Find_Matching_Actual (Formal_Node, Actual_Ent);
6468 Set_Instance_Of (Formal_Ent, Actual_Ent);
6471 Next_Non_Pragma (Formal_Node);
6474 -- No further formals to match.
6482 -- If the formal is not declared with a box, reanalyze it as
6483 -- an instantiation, to verify the matching rules of 12.7. The
6484 -- actual checks are performed after the generic associations
6489 I_Pack : constant Entity_Id :=
6490 Make_Defining_Identifier (Sloc (Actual),
6491 Chars => New_Internal_Name ('P'));
6494 Set_Is_Internal (I_Pack);
6497 Make_Package_Instantiation (Sloc (Actual),
6498 Defining_Unit_Name => I_Pack,
6499 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6500 Generic_Associations =>
6501 Generic_Associations (Formal)));
6507 end Instantiate_Formal_Package;
6509 -----------------------------------
6510 -- Instantiate_Formal_Subprogram --
6511 -----------------------------------
6513 function Instantiate_Formal_Subprogram
6516 Analyzed_Formal : Node_Id)
6519 Loc : Source_Ptr := Sloc (Instantiation_Node);
6520 Formal_Sub : constant Entity_Id :=
6521 Defining_Unit_Name (Specification (Formal));
6522 Analyzed_S : constant Entity_Id :=
6523 Defining_Unit_Name (Specification (Analyzed_Formal));
6524 Decl_Node : Node_Id;
6528 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6529 -- If the generic is a child unit, the parent has been installed
6530 -- on the scope stack, but a default subprogram cannot resolve to
6531 -- something on the parent because that parent is not really part
6532 -- of the visible context (it is there to resolve explicit local
6533 -- entities). If the default has resolved in this way, we remove
6534 -- the entity from immediate visibility and analyze the node again
6535 -- to emit an error message or find another visible candidate.
6537 procedure Valid_Actual_Subprogram (Act : Node_Id);
6538 -- Perform legality check and raise exception on failure.
6540 -----------------------
6541 -- From_Parent_Scope --
6542 -----------------------
6544 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6545 Gen_Scope : Node_Id := Scope (Analyzed_S);
6548 while Present (Gen_Scope)
6549 and then Is_Child_Unit (Gen_Scope)
6551 if Scope (Subp) = Scope (Gen_Scope) then
6555 Gen_Scope := Scope (Gen_Scope);
6559 end From_Parent_Scope;
6561 -----------------------------
6562 -- Valid_Actual_Subprogram --
6563 -----------------------------
6565 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6566 Act_E : Entity_Id := Empty;
6569 if Is_Entity_Name (Act) then
6570 Act_E := Entity (Act);
6571 elsif Nkind (Act) = N_Selected_Component
6572 and then Is_Entity_Name (Selector_Name (Act))
6574 Act_E := Entity (Selector_Name (Act));
6577 if (Present (Act_E) and then Is_Overloadable (Act_E))
6578 or else Nkind (Act) = N_Attribute_Reference
6579 or else Nkind (Act) = N_Indexed_Component
6580 or else Nkind (Act) = N_Character_Literal
6581 or else Nkind (Act) = N_Explicit_Dereference
6587 ("expect subprogram or entry name in instantiation of&",
6588 Instantiation_Node, Formal_Sub);
6589 Abandon_Instantiation (Instantiation_Node);
6591 end Valid_Actual_Subprogram;
6593 -- Start of processing for Instantiate_Formal_Subprogram
6596 New_Spec := New_Copy_Tree (Specification (Formal));
6598 -- Create new entity for the actual (New_Copy_Tree does not).
6600 Set_Defining_Unit_Name
6601 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6603 -- Find entity of actual. If the actual is an attribute reference, it
6604 -- cannot be resolved here (its formal is missing) but is handled
6605 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6606 -- fully resolved subsequently, when the renaming declaration for the
6607 -- formal is analyzed. If it is an explicit dereference, resolve the
6608 -- prefix but not the actual itself, to prevent interpretation as a
6611 if Present (Actual) then
6612 Loc := Sloc (Actual);
6613 Set_Sloc (New_Spec, Loc);
6615 if Nkind (Actual) = N_Operator_Symbol then
6616 Find_Direct_Name (Actual);
6618 elsif Nkind (Actual) = N_Explicit_Dereference then
6619 Analyze (Prefix (Actual));
6621 elsif Nkind (Actual) /= N_Attribute_Reference then
6625 Valid_Actual_Subprogram (Actual);
6628 elsif Present (Default_Name (Formal)) then
6629 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6630 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6631 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6632 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6633 and then Present (Entity (Default_Name (Formal)))
6635 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6637 Nam := New_Copy (Default_Name (Formal));
6638 Set_Sloc (Nam, Loc);
6641 elsif Box_Present (Formal) then
6643 -- Actual is resolved at the point of instantiation. Create
6644 -- an identifier or operator with the same name as the formal.
6646 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6647 Nam := Make_Operator_Symbol (Loc,
6648 Chars => Chars (Formal_Sub),
6649 Strval => No_String);
6651 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6655 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
6657 ("missing actual&", Instantiation_Node, Formal_Sub);
6659 ("\in instantiation of & declared#",
6660 Instantiation_Node, Scope (Analyzed_S));
6661 Abandon_Instantiation (Instantiation_Node);
6665 Make_Subprogram_Renaming_Declaration (Loc,
6666 Specification => New_Spec,
6669 -- Gather possible interpretations for the actual before analyzing the
6670 -- instance. If overloaded, it will be resolved when analyzing the
6671 -- renaming declaration.
6673 if Box_Present (Formal)
6674 and then No (Actual)
6678 if Is_Child_Unit (Scope (Analyzed_S))
6679 and then Present (Entity (Nam))
6681 if not Is_Overloaded (Nam) then
6683 if From_Parent_Scope (Entity (Nam)) then
6684 Set_Is_Immediately_Visible (Entity (Nam), False);
6685 Set_Entity (Nam, Empty);
6686 Set_Etype (Nam, Empty);
6690 Set_Is_Immediately_Visible (Entity (Nam));
6699 Get_First_Interp (Nam, I, It);
6701 while Present (It.Nam) loop
6702 if From_Parent_Scope (It.Nam) then
6706 Get_Next_Interp (I, It);
6713 -- The generic instantiation freezes the actual. This can only be
6714 -- done once the actual is resolved, in the analysis of the renaming
6715 -- declaration. To indicate that must be done, we set the corresponding
6716 -- spec of the node to point to the formal subprogram entity.
6718 Set_Corresponding_Spec (Decl_Node, Analyzed_S);
6720 -- We cannot analyze the renaming declaration, and thus find the
6721 -- actual, until the all the actuals are assembled in the instance.
6722 -- For subsequent checks of other actuals, indicate the node that
6723 -- will hold the instance of this formal.
6725 Set_Instance_Of (Analyzed_S, Nam);
6727 if Nkind (Actual) = N_Selected_Component
6728 and then Is_Task_Type (Etype (Prefix (Actual)))
6729 and then not Is_Frozen (Etype (Prefix (Actual)))
6731 -- The renaming declaration will create a body, which must appear
6732 -- outside of the instantiation, We move the renaming declaration
6733 -- out of the instance, and create an additional renaming inside,
6734 -- to prevent freezing anomalies.
6737 Anon_Id : constant Entity_Id :=
6738 Make_Defining_Identifier
6739 (Loc, New_Internal_Name ('E'));
6741 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6742 Insert_Before (Instantiation_Node, Decl_Node);
6743 Analyze (Decl_Node);
6745 -- Now create renaming within the instance
6748 Make_Subprogram_Renaming_Declaration (Loc,
6749 Specification => New_Copy_Tree (New_Spec),
6750 Name => New_Occurrence_Of (Anon_Id, Loc));
6752 Set_Defining_Unit_Name (Specification (Decl_Node),
6753 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6758 end Instantiate_Formal_Subprogram;
6760 ------------------------
6761 -- Instantiate_Object --
6762 ------------------------
6764 function Instantiate_Object
6767 Analyzed_Formal : Node_Id)
6770 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6771 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6772 Loc : constant Source_Ptr := Sloc (Actual);
6773 Act_Assoc : constant Node_Id := Parent (Actual);
6774 Orig_Ftyp : constant Entity_Id :=
6775 Etype (Defining_Identifier (Analyzed_Formal));
6776 List : constant List_Id := New_List;
6778 Decl_Node : Node_Id;
6779 Subt_Decl : Node_Id := Empty;
6782 -- Sloc for error message on missing actual.
6783 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
6785 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6786 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6789 Set_Parent (List, Parent (Actual));
6793 if Out_Present (Formal) then
6795 -- An IN OUT generic actual must be a name. The instantiation is
6796 -- a renaming declaration. The actual is the name being renamed.
6797 -- We use the actual directly, rather than a copy, because it is not
6798 -- used further in the list of actuals, and because a copy or a use
6799 -- of relocate_node is incorrect if the instance is nested within
6800 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6801 -- field links the declaration to the generic association.
6806 Instantiation_Node, Formal_Id);
6808 ("\in instantiation of & declared#",
6810 Scope (Defining_Identifier (Analyzed_Formal)));
6811 Abandon_Instantiation (Instantiation_Node);
6815 Make_Object_Renaming_Declaration (Loc,
6816 Defining_Identifier => New_Copy (Formal_Id),
6817 Subtype_Mark => New_Copy_Tree (Type_Id),
6820 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6822 -- The analysis of the actual may produce insert_action nodes, so
6823 -- the declaration must have a context in which to attach them.
6825 Append (Decl_Node, List);
6828 -- This check is performed here because Analyze_Object_Renaming
6829 -- will not check it when Comes_From_Source is False. Note
6830 -- though that the check for the actual being the name of an
6831 -- object will be performed in Analyze_Object_Renaming.
6833 if Is_Object_Reference (Actual)
6834 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6837 ("illegal discriminant-dependent component for in out parameter",
6841 -- The actual has to be resolved in order to check that it is
6842 -- a variable (due to cases such as F(1), where F returns
6843 -- access to an array, and for overloaded prefixes).
6846 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6848 if Is_Private_Type (Ftyp)
6849 and then not Is_Private_Type (Etype (Actual))
6850 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6851 or else Base_Type (Etype (Actual)) = Ftyp)
6853 -- If the actual has the type of the full view of the formal,
6854 -- or else a non-private subtype of the formal, then
6855 -- the visibility of the formal type has changed. Add to the
6856 -- actuals a subtype declaration that will force the exchange
6857 -- of views in the body of the instance as well.
6860 Make_Subtype_Declaration (Loc,
6861 Defining_Identifier =>
6862 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6863 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6865 Prepend (Subt_Decl, List);
6867 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6868 Exchange_Declarations (Ftyp);
6871 Resolve (Actual, Ftyp);
6873 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6875 ("actual for& must be a variable", Actual, Formal_Id);
6877 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6879 "type of actual does not match type of&", Actual, Formal_Id);
6883 Note_Possible_Modification (Actual);
6885 -- Check for instantiation of atomic/volatile actual for
6886 -- non-atomic/volatile formal (RM C.6 (12)).
6888 if Is_Atomic_Object (Actual)
6889 and then not Is_Atomic (Orig_Ftyp)
6892 ("cannot instantiate non-atomic formal object " &
6893 "with atomic actual", Actual);
6895 elsif Is_Volatile_Object (Actual)
6896 and then not Is_Volatile (Orig_Ftyp)
6899 ("cannot instantiate non-volatile formal object " &
6900 "with volatile actual", Actual);
6906 -- The instantiation of a generic formal in-parameter
6907 -- is a constant declaration. The actual is the expression for
6908 -- that declaration.
6910 if Present (Actual) then
6912 Decl_Node := Make_Object_Declaration (Loc,
6913 Defining_Identifier => New_Copy (Formal_Id),
6914 Constant_Present => True,
6915 Object_Definition => New_Copy_Tree (Type_Id),
6916 Expression => Actual);
6918 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6920 -- A generic formal object of a tagged type is defined
6921 -- to be aliased so the new constant must also be treated
6925 (Etype (Defining_Identifier (Analyzed_Formal)))
6927 Set_Aliased_Present (Decl_Node);
6930 Append (Decl_Node, List);
6932 -- No need to repeat (pre-)analysis of some expression nodes
6933 -- already handled in Pre_Analyze_Actuals.
6935 if Nkind (Actual) /= N_Allocator then
6940 Typ : constant Entity_Id :=
6942 (Etype (Defining_Identifier (Analyzed_Formal)));
6945 Freeze_Before (Instantiation_Node, Typ);
6947 -- If the actual is an aggregate, perform name resolution
6948 -- on its components (the analysis of an aggregate does not
6949 -- do it) to capture local names that may be hidden if the
6950 -- generic is a child unit.
6952 if Nkind (Actual) = N_Aggregate then
6953 Pre_Analyze_And_Resolve (Actual, Typ);
6957 elsif Present (Expression (Formal)) then
6959 -- Use default to construct declaration.
6962 Make_Object_Declaration (Sloc (Formal),
6963 Defining_Identifier => New_Copy (Formal_Id),
6964 Constant_Present => True,
6965 Object_Definition => New_Copy (Type_Id),
6966 Expression => New_Copy_Tree (Expression (Formal)));
6968 Append (Decl_Node, List);
6969 Set_Analyzed (Expression (Decl_Node), False);
6974 Instantiation_Node, Formal_Id);
6975 Error_Msg_NE ("\in instantiation of & declared#",
6977 Scope (Defining_Identifier (Analyzed_Formal)));
6980 (Etype (Defining_Identifier (Analyzed_Formal)))
6982 -- Create dummy constant declaration so that instance can
6983 -- be analyzed, to minimize cascaded visibility errors.
6986 Make_Object_Declaration (Loc,
6987 Defining_Identifier => New_Copy (Formal_Id),
6988 Constant_Present => True,
6989 Object_Definition => New_Copy (Type_Id),
6991 Make_Attribute_Reference (Sloc (Formal_Id),
6992 Attribute_Name => Name_First,
6993 Prefix => New_Copy (Type_Id)));
6995 Append (Decl_Node, List);
6998 Abandon_Instantiation (Instantiation_Node);
7005 end Instantiate_Object;
7007 ------------------------------
7008 -- Instantiate_Package_Body --
7009 ------------------------------
7011 procedure Instantiate_Package_Body
7012 (Body_Info : Pending_Body_Info;
7013 Inlined_Body : Boolean := False)
7015 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7016 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7017 Loc : constant Source_Ptr := Sloc (Inst_Node);
7019 Gen_Id : constant Node_Id := Name (Inst_Node);
7020 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7021 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7022 Act_Spec : constant Node_Id := Specification (Act_Decl);
7023 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
7025 Act_Body_Name : Node_Id;
7027 Gen_Body_Id : Node_Id;
7029 Act_Body_Id : Entity_Id;
7031 Parent_Installed : Boolean := False;
7032 Save_Style_Check : constant Boolean := Style_Check;
7035 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7037 -- The instance body may already have been processed, as the parent
7038 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7040 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
7044 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7046 if No (Gen_Body_Id) then
7047 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7048 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7051 -- Establish global variable for sloc adjustment and for error
7054 Instantiation_Node := Inst_Node;
7056 if Present (Gen_Body_Id) then
7057 Save_Env (Gen_Unit, Act_Decl_Id);
7058 Style_Check := False;
7059 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7061 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7063 Create_Instantiation_Source
7064 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
7068 (Original_Node (Gen_Body), Empty, Instantiating => True);
7070 -- Build new name (possibly qualified) for body declaration
7072 Act_Body_Id := New_Copy (Act_Decl_Id);
7074 -- Some attributes of the spec entity are not inherited by the
7077 Set_Handler_Records (Act_Body_Id, No_List);
7079 if Nkind (Defining_Unit_Name (Act_Spec)) =
7080 N_Defining_Program_Unit_Name
7083 Make_Defining_Program_Unit_Name (Loc,
7084 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
7085 Defining_Identifier => Act_Body_Id);
7087 Act_Body_Name := Act_Body_Id;
7090 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
7092 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
7093 Check_Generic_Actuals (Act_Decl_Id, False);
7095 -- If it is a child unit, make the parent instance (which is an
7096 -- instance of the parent of the generic) visible. The parent
7097 -- instance is the prefix of the name of the generic unit.
7099 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7100 and then Nkind (Gen_Id) = N_Expanded_Name
7102 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7103 Parent_Installed := True;
7105 elsif Is_Child_Unit (Gen_Unit) then
7106 Install_Parent (Scope (Gen_Unit), In_Body => True);
7107 Parent_Installed := True;
7110 -- If the instantiation is a library unit, and this is the main
7111 -- unit, then build the resulting compilation unit nodes for the
7112 -- instance. If this is a compilation unit but it is not the main
7113 -- unit, then it is the body of a unit in the context, that is being
7114 -- compiled because it is encloses some inlined unit or another
7115 -- generic unit being instantiated. In that case, this body is not
7116 -- part of the current compilation, and is not attached to the tree,
7117 -- but its parent must be set for analysis.
7119 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7121 -- Replace instance node with body of instance, and create
7122 -- new node for corresponding instance declaration.
7124 Build_Instance_Compilation_Unit_Nodes
7125 (Inst_Node, Act_Body, Act_Decl);
7126 Analyze (Inst_Node);
7128 if Parent (Inst_Node) = Cunit (Main_Unit) then
7130 -- If the instance is a child unit itself, then set the
7131 -- scope of the expanded body to be the parent of the
7132 -- instantiation (ensuring that the fully qualified name
7133 -- will be generated for the elaboration subprogram).
7135 if Nkind (Defining_Unit_Name (Act_Spec)) =
7136 N_Defining_Program_Unit_Name
7139 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
7143 -- Case where instantiation is not a library unit
7146 -- If this is an early instantiation, i.e. appears textually
7147 -- before the corresponding body and must be elaborated first,
7148 -- indicate that the body instance is to be delayed.
7150 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
7152 -- Now analyze the body. We turn off all checks if this is
7153 -- an internal unit, since there is no reason to have checks
7154 -- on for any predefined run-time library code. All such
7155 -- code is designed to be compiled with checks off.
7157 -- Note that we do NOT apply this criterion to children of
7158 -- GNAT (or on VMS, children of DEC). The latter units must
7159 -- suppress checks explicitly if this is needed.
7161 if Is_Predefined_File_Name
7162 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
7164 Analyze (Act_Body, Suppress => All_Checks);
7170 if not Generic_Separately_Compiled (Gen_Unit) then
7171 Inherit_Context (Gen_Body, Inst_Node);
7174 -- Remove the parent instances if they have been placed on the
7175 -- scope stack to compile the body.
7177 if Parent_Installed then
7178 Remove_Parent (In_Body => True);
7181 Restore_Private_Views (Act_Decl_Id);
7183 -- Remove the current unit from visibility if this is an instance
7184 -- that is not elaborated on the fly for inlining purposes.
7186 if not Inlined_Body then
7187 Set_Is_Immediately_Visible (Act_Decl_Id, False);
7191 Style_Check := Save_Style_Check;
7193 -- If we have no body, and the unit requires a body, then complain.
7194 -- This complaint is suppressed if we have detected other errors
7195 -- (since a common reason for missing the body is that it had errors).
7197 elsif Unit_Requires_Body (Gen_Unit) then
7198 if Serious_Errors_Detected = 0 then
7200 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
7202 -- Don't attempt to perform any cleanup actions if some other
7203 -- error was aready detected, since this can cause blowups.
7209 -- Case of package that does not need a body
7212 -- If the instantiation of the declaration is a library unit,
7213 -- rewrite the original package instantiation as a package
7214 -- declaration in the compilation unit node.
7216 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7217 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
7218 Rewrite (Inst_Node, Act_Decl);
7220 -- Generate elaboration entity, in case spec has elaboration
7221 -- code. This cannot be done when the instance is analyzed,
7222 -- because it is not known yet whether the body exists.
7224 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
7225 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
7227 -- If the instantiation is not a library unit, then append the
7228 -- declaration to the list of implicitly generated entities.
7229 -- unless it is already a list member which means that it was
7230 -- already processed
7232 elsif not Is_List_Member (Act_Decl) then
7233 Mark_Rewrite_Insertion (Act_Decl);
7234 Insert_Before (Inst_Node, Act_Decl);
7238 Expander_Mode_Restore;
7239 end Instantiate_Package_Body;
7241 ---------------------------------
7242 -- Instantiate_Subprogram_Body --
7243 ---------------------------------
7245 procedure Instantiate_Subprogram_Body
7246 (Body_Info : Pending_Body_Info)
7248 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7249 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7250 Loc : constant Source_Ptr := Sloc (Inst_Node);
7251 Gen_Id : constant Node_Id := Name (Inst_Node);
7252 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7253 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7254 Anon_Id : constant Entity_Id :=
7255 Defining_Unit_Name (Specification (Act_Decl));
7256 Pack_Id : constant Entity_Id :=
7257 Defining_Unit_Name (Parent (Act_Decl));
7260 Gen_Body_Id : Node_Id;
7262 Act_Body_Id : Entity_Id;
7263 Pack_Body : Node_Id;
7264 Prev_Formal : Entity_Id;
7266 Unit_Renaming : Node_Id;
7268 Parent_Installed : Boolean := False;
7269 Save_Style_Check : constant Boolean := Style_Check;
7272 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7274 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7276 if No (Gen_Body_Id) then
7277 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7278 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7281 Instantiation_Node := Inst_Node;
7283 if Present (Gen_Body_Id) then
7284 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7286 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
7288 -- Either body is not present, or context is non-expanding, as
7289 -- when compiling a subunit. Mark the instance as completed.
7291 Set_Has_Completion (Anon_Id);
7295 Save_Env (Gen_Unit, Anon_Id);
7296 Style_Check := False;
7297 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7298 Create_Instantiation_Source
7306 (Original_Node (Gen_Body), Empty, Instantiating => True);
7307 Act_Body_Id := Defining_Entity (Act_Body);
7308 Set_Chars (Act_Body_Id, Chars (Anon_Id));
7309 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
7310 Set_Corresponding_Spec (Act_Body, Anon_Id);
7311 Set_Has_Completion (Anon_Id);
7312 Check_Generic_Actuals (Pack_Id, False);
7314 -- If it is a child unit, make the parent instance (which is an
7315 -- instance of the parent of the generic) visible. The parent
7316 -- instance is the prefix of the name of the generic unit.
7318 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7319 and then Nkind (Gen_Id) = N_Expanded_Name
7321 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7322 Parent_Installed := True;
7324 elsif Is_Child_Unit (Gen_Unit) then
7325 Install_Parent (Scope (Gen_Unit), In_Body => True);
7326 Parent_Installed := True;
7329 -- Inside its body, a reference to the generic unit is a reference
7330 -- to the instance. The corresponding renaming is the first
7331 -- declaration in the body.
7334 Make_Subprogram_Renaming_Declaration (Loc,
7337 Specification (Original_Node (Gen_Body)),
7339 Instantiating => True),
7340 Name => New_Occurrence_Of (Anon_Id, Loc));
7342 -- If there is a formal subprogram with the same name as the
7343 -- unit itself, do not add this renaming declaration. This is
7344 -- a temporary fix for one ACVC test. ???
7346 Prev_Formal := First_Entity (Pack_Id);
7347 while Present (Prev_Formal) loop
7348 if Chars (Prev_Formal) = Chars (Gen_Unit)
7349 and then Is_Overloadable (Prev_Formal)
7354 Next_Entity (Prev_Formal);
7357 if Present (Prev_Formal) then
7358 Decls := New_List (Act_Body);
7360 Decls := New_List (Unit_Renaming, Act_Body);
7363 -- The subprogram body is placed in the body of a dummy package
7364 -- body, whose spec contains the subprogram declaration as well
7365 -- as the renaming declarations for the generic parameters.
7367 Pack_Body := Make_Package_Body (Loc,
7368 Defining_Unit_Name => New_Copy (Pack_Id),
7369 Declarations => Decls);
7371 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7373 -- If the instantiation is a library unit, then build resulting
7374 -- compilation unit nodes for the instance. The declaration of
7375 -- the enclosing package is the grandparent of the subprogram
7376 -- declaration. First replace the instantiation node as the unit
7377 -- of the corresponding compilation.
7379 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7380 if Parent (Inst_Node) = Cunit (Main_Unit) then
7381 Set_Unit (Parent (Inst_Node), Inst_Node);
7382 Build_Instance_Compilation_Unit_Nodes
7383 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
7384 Analyze (Inst_Node);
7386 Set_Parent (Pack_Body, Parent (Inst_Node));
7387 Analyze (Pack_Body);
7391 Insert_Before (Inst_Node, Pack_Body);
7392 Mark_Rewrite_Insertion (Pack_Body);
7393 Analyze (Pack_Body);
7395 if Expander_Active then
7396 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
7400 if not Generic_Separately_Compiled (Gen_Unit) then
7401 Inherit_Context (Gen_Body, Inst_Node);
7404 Restore_Private_Views (Pack_Id, False);
7406 if Parent_Installed then
7407 Remove_Parent (In_Body => True);
7411 Style_Check := Save_Style_Check;
7413 -- Body not found. Error was emitted already. If there were no
7414 -- previous errors, this may be an instance whose scope is a premature
7415 -- instance. In that case we must insure that the (legal) program does
7416 -- raise program error if executed. We generate a subprogram body for
7417 -- this purpose. See DEC ac30vso.
7419 elsif Serious_Errors_Detected = 0
7420 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
7422 if Ekind (Anon_Id) = E_Procedure then
7424 Make_Subprogram_Body (Loc,
7426 Make_Procedure_Specification (Loc,
7427 Defining_Unit_Name => New_Copy (Anon_Id),
7428 Parameter_Specifications =>
7430 (Parameter_Specifications (Parent (Anon_Id)))),
7432 Declarations => Empty_List,
7433 Handled_Statement_Sequence =>
7434 Make_Handled_Sequence_Of_Statements (Loc,
7437 Make_Raise_Program_Error (Loc,
7439 PE_Access_Before_Elaboration))));
7443 Make_Raise_Program_Error (Loc,
7444 Reason => PE_Access_Before_Elaboration);
7446 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
7447 Set_Analyzed (Ret_Expr);
7450 Make_Subprogram_Body (Loc,
7452 Make_Function_Specification (Loc,
7453 Defining_Unit_Name => New_Copy (Anon_Id),
7454 Parameter_Specifications =>
7456 (Parameter_Specifications (Parent (Anon_Id))),
7458 New_Occurrence_Of (Etype (Anon_Id), Loc)),
7460 Declarations => Empty_List,
7461 Handled_Statement_Sequence =>
7462 Make_Handled_Sequence_Of_Statements (Loc,
7464 New_List (Make_Return_Statement (Loc, Ret_Expr))));
7467 Pack_Body := Make_Package_Body (Loc,
7468 Defining_Unit_Name => New_Copy (Pack_Id),
7469 Declarations => New_List (Act_Body));
7471 Insert_After (Inst_Node, Pack_Body);
7472 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7473 Analyze (Pack_Body);
7476 Expander_Mode_Restore;
7477 end Instantiate_Subprogram_Body;
7479 ----------------------
7480 -- Instantiate_Type --
7481 ----------------------
7483 function Instantiate_Type
7486 Analyzed_Formal : Node_Id;
7487 Actual_Decls : List_Id)
7490 Loc : constant Source_Ptr := Sloc (Actual);
7491 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
7492 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
7493 Ancestor : Entity_Id := Empty;
7494 Def : constant Node_Id := Formal_Type_Definition (Formal);
7496 Decl_Node : Node_Id;
7498 procedure Validate_Array_Type_Instance;
7499 procedure Validate_Access_Subprogram_Instance;
7500 procedure Validate_Access_Type_Instance;
7501 procedure Validate_Derived_Type_Instance;
7502 procedure Validate_Private_Type_Instance;
7503 -- These procedures perform validation tests for the named case
7505 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
7506 -- Check that base types are the same and that the subtypes match
7507 -- statically. Used in several of the above.
7509 --------------------
7510 -- Subtypes_Match --
7511 --------------------
7513 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7514 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7517 return (Base_Type (T) = Base_Type (Act_T)
7518 -- why is the and then commented out here???
7519 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7520 and then Subtypes_Statically_Match (T, Act_T))
7522 or else (Is_Class_Wide_Type (Gen_T)
7523 and then Is_Class_Wide_Type (Act_T)
7526 Get_Instance_Of (Root_Type (Gen_T)),
7527 Root_Type (Act_T)));
7530 -----------------------------------------
7531 -- Validate_Access_Subprogram_Instance --
7532 -----------------------------------------
7534 procedure Validate_Access_Subprogram_Instance is
7536 if not Is_Access_Type (Act_T)
7537 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7540 ("expect access type in instantiation of &", Actual, Gen_T);
7541 Abandon_Instantiation (Actual);
7544 Check_Mode_Conformant
7545 (Designated_Type (Act_T),
7546 Designated_Type (A_Gen_T),
7550 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7551 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7553 ("protected access type not allowed for formal &",
7557 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7559 ("expect protected access type for formal &",
7562 end Validate_Access_Subprogram_Instance;
7564 -----------------------------------
7565 -- Validate_Access_Type_Instance --
7566 -----------------------------------
7568 procedure Validate_Access_Type_Instance is
7569 Desig_Type : constant Entity_Id :=
7571 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7574 if not Is_Access_Type (Act_T) then
7576 ("expect access type in instantiation of &", Actual, Gen_T);
7577 Abandon_Instantiation (Actual);
7580 if Is_Access_Constant (A_Gen_T) then
7581 if not Is_Access_Constant (Act_T) then
7583 ("actual type must be access-to-constant type", Actual);
7584 Abandon_Instantiation (Actual);
7587 if Is_Access_Constant (Act_T) then
7589 ("actual type must be access-to-variable type", Actual);
7590 Abandon_Instantiation (Actual);
7592 elsif Ekind (A_Gen_T) = E_General_Access_Type
7593 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7595 Error_Msg_N ("actual must be general access type!", Actual);
7596 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7597 Abandon_Instantiation (Actual);
7601 -- The designated subtypes, that is to say the subtypes introduced
7602 -- by an access type declaration (and not by a subtype declaration)
7605 if not Subtypes_Match
7606 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7609 ("designated type of actual does not match that of formal &",
7611 Abandon_Instantiation (Actual);
7613 elsif Is_Access_Type (Designated_Type (Act_T))
7614 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7616 Is_Constrained (Designated_Type (Desig_Type))
7619 ("designated type of actual does not match that of formal &",
7621 Abandon_Instantiation (Actual);
7623 end Validate_Access_Type_Instance;
7625 ----------------------------------
7626 -- Validate_Array_Type_Instance --
7627 ----------------------------------
7629 procedure Validate_Array_Type_Instance is
7634 function Formal_Dimensions return Int;
7635 -- Count number of dimensions in array type formal
7637 function Formal_Dimensions return Int is
7642 if Nkind (Def) = N_Constrained_Array_Definition then
7643 Index := First (Discrete_Subtype_Definitions (Def));
7645 Index := First (Subtype_Marks (Def));
7648 while Present (Index) loop
7654 end Formal_Dimensions;
7656 -- Start of processing for Validate_Array_Type_Instance
7659 if not Is_Array_Type (Act_T) then
7661 ("expect array type in instantiation of &", Actual, Gen_T);
7662 Abandon_Instantiation (Actual);
7664 elsif Nkind (Def) = N_Constrained_Array_Definition then
7665 if not (Is_Constrained (Act_T)) then
7667 ("expect constrained array in instantiation of &",
7669 Abandon_Instantiation (Actual);
7673 if Is_Constrained (Act_T) then
7675 ("expect unconstrained array in instantiation of &",
7677 Abandon_Instantiation (Actual);
7681 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7683 ("dimensions of actual do not match formal &", Actual, Gen_T);
7684 Abandon_Instantiation (Actual);
7687 I1 := First_Index (A_Gen_T);
7688 I2 := First_Index (Act_T);
7689 for J in 1 .. Formal_Dimensions loop
7691 -- If the indices of the actual were given by a subtype_mark,
7692 -- the index was transformed into a range attribute. Retrieve
7693 -- the original type mark for checking.
7695 if Is_Entity_Name (Original_Node (I2)) then
7696 T2 := Entity (Original_Node (I2));
7701 if not Subtypes_Match
7702 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7705 ("index types of actual do not match those of formal &",
7707 Abandon_Instantiation (Actual);
7714 if not Subtypes_Match (
7715 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7716 Component_Type (Act_T))
7719 ("component subtype of actual does not match that of formal &",
7721 Abandon_Instantiation (Actual);
7724 if Has_Aliased_Components (A_Gen_T)
7725 and then not Has_Aliased_Components (Act_T)
7728 ("actual must have aliased components to match formal type &",
7732 end Validate_Array_Type_Instance;
7734 ------------------------------------
7735 -- Validate_Derived_Type_Instance --
7736 ------------------------------------
7738 procedure Validate_Derived_Type_Instance is
7739 Actual_Discr : Entity_Id;
7740 Ancestor_Discr : Entity_Id;
7743 -- If the parent type in the generic declaration is itself
7744 -- a previous formal type, then it is local to the generic
7745 -- and absent from the analyzed generic definition. In that
7746 -- case the ancestor is the instance of the formal (which must
7747 -- have been instantiated previously), unless the ancestor is
7748 -- itself a formal derived type. In this latter case (which is the
7749 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
7750 -- formals is the ancestor of its parent. Otherwise, the analyzed
7751 -- generic carries the parent type. If the parent type is defined
7752 -- in a previous formal package, then the scope of that formal
7753 -- package is that of the generic type itself, and it has already
7754 -- been mapped into the corresponding type in the actual package.
7756 -- Common case: parent type defined outside of the generic
7758 if Is_Entity_Name (Subtype_Mark (Def))
7759 and then Present (Entity (Subtype_Mark (Def)))
7761 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7763 -- Check whether parent is defined in a previous formal package
7766 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7769 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7771 -- The type may be a local derivation, or a type extension of
7772 -- a previous formal, or of a formal of a parent package.
7774 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
7776 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
7778 -- Check whether the parent is another derived formal type
7779 -- in the same generic unit.
7781 if Etype (A_Gen_T) /= A_Gen_T
7782 and then Is_Generic_Type (Etype (A_Gen_T))
7783 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
7784 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
7786 -- Locate ancestor of parent from the subtype declaration
7787 -- created for the actual.
7793 Decl := First (Actual_Decls);
7794 while Present (Decl) loop
7795 if Nkind (Decl) = N_Subtype_Declaration
7796 and then Chars (Defining_Identifier (Decl)) =
7797 Chars (Etype (A_Gen_T))
7799 Ancestor := Generic_Parent_Type (Decl);
7807 pragma Assert (Present (Ancestor));
7811 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7815 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7818 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7820 ("expect type derived from & in instantiation",
7821 Actual, First_Subtype (Ancestor));
7822 Abandon_Instantiation (Actual);
7825 -- Perform atomic/volatile checks (RM C.6(12))
7827 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7829 ("cannot have atomic actual type for non-atomic formal type",
7832 elsif Is_Volatile (Act_T)
7833 and then not Is_Volatile (Ancestor)
7834 and then Is_By_Reference_Type (Ancestor)
7837 ("cannot have volatile actual type for non-volatile formal type",
7841 -- It should not be necessary to check for unknown discriminants
7842 -- on Formal, but for some reason Has_Unknown_Discriminants is
7843 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7844 -- returns False. This needs fixing. ???
7846 if not Is_Indefinite_Subtype (A_Gen_T)
7847 and then not Unknown_Discriminants_Present (Formal)
7848 and then Is_Indefinite_Subtype (Act_T)
7851 ("actual subtype must be constrained", Actual);
7852 Abandon_Instantiation (Actual);
7855 if not Unknown_Discriminants_Present (Formal) then
7856 if Is_Constrained (Ancestor) then
7857 if not Is_Constrained (Act_T) then
7859 ("actual subtype must be constrained", Actual);
7860 Abandon_Instantiation (Actual);
7863 -- Ancestor is unconstrained
7865 elsif Is_Constrained (Act_T) then
7866 if Ekind (Ancestor) = E_Access_Type
7867 or else Is_Composite_Type (Ancestor)
7870 ("actual subtype must be unconstrained", Actual);
7871 Abandon_Instantiation (Actual);
7874 -- A class-wide type is only allowed if the formal has
7875 -- unknown discriminants.
7877 elsif Is_Class_Wide_Type (Act_T)
7878 and then not Has_Unknown_Discriminants (Ancestor)
7881 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7882 Abandon_Instantiation (Actual);
7884 -- Otherwise, the formal and actual shall have the same
7885 -- number of discriminants and each discriminant of the
7886 -- actual must correspond to a discriminant of the formal.
7888 elsif Has_Discriminants (Act_T)
7889 and then Has_Discriminants (Ancestor)
7891 Actual_Discr := First_Discriminant (Act_T);
7892 Ancestor_Discr := First_Discriminant (Ancestor);
7893 while Present (Actual_Discr)
7894 and then Present (Ancestor_Discr)
7896 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7897 not Present (Corresponding_Discriminant (Actual_Discr))
7900 ("discriminant & does not correspond " &
7901 "to ancestor discriminant", Actual, Actual_Discr);
7902 Abandon_Instantiation (Actual);
7905 Next_Discriminant (Actual_Discr);
7906 Next_Discriminant (Ancestor_Discr);
7909 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7911 ("actual for & must have same number of discriminants",
7913 Abandon_Instantiation (Actual);
7916 -- This case should be caught by the earlier check for
7917 -- for constrainedness, but the check here is added for
7920 elsif Has_Discriminants (Act_T) then
7922 ("actual for & must not have discriminants", Actual, Gen_T);
7923 Abandon_Instantiation (Actual);
7925 elsif Has_Discriminants (Ancestor) then
7927 ("actual for & must have known discriminants", Actual, Gen_T);
7928 Abandon_Instantiation (Actual);
7931 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7933 ("constraint on actual is incompatible with formal", Actual);
7934 Abandon_Instantiation (Actual);
7937 end Validate_Derived_Type_Instance;
7939 ------------------------------------
7940 -- Validate_Private_Type_Instance --
7941 ------------------------------------
7943 procedure Validate_Private_Type_Instance is
7944 Formal_Discr : Entity_Id;
7945 Actual_Discr : Entity_Id;
7946 Formal_Subt : Entity_Id;
7949 if Is_Limited_Type (Act_T)
7950 and then not Is_Limited_Type (A_Gen_T)
7953 ("actual for non-limited & cannot be a limited type", Actual,
7955 Explain_Limited_Type (Act_T, Actual);
7956 Abandon_Instantiation (Actual);
7958 elsif Is_Indefinite_Subtype (Act_T)
7959 and then not Is_Indefinite_Subtype (A_Gen_T)
7963 ("actual for & must be a definite subtype", Actual, Gen_T);
7965 elsif not Is_Tagged_Type (Act_T)
7966 and then Is_Tagged_Type (A_Gen_T)
7969 ("actual for & must be a tagged type", Actual, Gen_T);
7971 elsif Has_Discriminants (A_Gen_T) then
7972 if not Has_Discriminants (Act_T) then
7974 ("actual for & must have discriminants", Actual, Gen_T);
7975 Abandon_Instantiation (Actual);
7977 elsif Is_Constrained (Act_T) then
7979 ("actual for & must be unconstrained", Actual, Gen_T);
7980 Abandon_Instantiation (Actual);
7983 Formal_Discr := First_Discriminant (A_Gen_T);
7984 Actual_Discr := First_Discriminant (Act_T);
7985 while Formal_Discr /= Empty loop
7986 if Actual_Discr = Empty then
7988 ("discriminants on actual do not match formal",
7990 Abandon_Instantiation (Actual);
7993 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7995 -- access discriminants match if designated types do.
7997 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7998 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7999 = E_Anonymous_Access_Type
8000 and then Get_Instance_Of (
8001 Designated_Type (Base_Type (Formal_Subt)))
8002 = Designated_Type (Base_Type (Etype (Actual_Discr)))
8006 elsif Base_Type (Formal_Subt) /=
8007 Base_Type (Etype (Actual_Discr))
8010 ("types of actual discriminants must match formal",
8012 Abandon_Instantiation (Actual);
8014 elsif not Subtypes_Statically_Match
8015 (Formal_Subt, Etype (Actual_Discr))
8019 ("subtypes of actual discriminants must match formal",
8021 Abandon_Instantiation (Actual);
8024 Next_Discriminant (Formal_Discr);
8025 Next_Discriminant (Actual_Discr);
8028 if Actual_Discr /= Empty then
8030 ("discriminants on actual do not match formal",
8032 Abandon_Instantiation (Actual);
8039 end Validate_Private_Type_Instance;
8041 -- Start of processing for Instantiate_Type
8044 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
8045 Error_Msg_N ("duplicate instantiation of generic type", Actual);
8048 elsif not Is_Entity_Name (Actual)
8049 or else not Is_Type (Entity (Actual))
8052 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
8053 Abandon_Instantiation (Actual);
8056 Act_T := Entity (Actual);
8058 -- Deal with fixed/floating restrictions
8060 if Is_Floating_Point_Type (Act_T) then
8061 Check_Restriction (No_Floating_Point, Actual);
8062 elsif Is_Fixed_Point_Type (Act_T) then
8063 Check_Restriction (No_Fixed_Point, Actual);
8066 -- Deal with error of using incomplete type as generic actual
8068 if Ekind (Act_T) = E_Incomplete_Type then
8069 if No (Underlying_Type (Act_T)) then
8070 Error_Msg_N ("premature use of incomplete type", Actual);
8071 Abandon_Instantiation (Actual);
8073 Act_T := Full_View (Act_T);
8074 Set_Entity (Actual, Act_T);
8076 if Has_Private_Component (Act_T) then
8078 ("premature use of type with private component", Actual);
8082 -- Deal with error of premature use of private type as generic actual
8084 elsif Is_Private_Type (Act_T)
8085 and then Is_Private_Type (Base_Type (Act_T))
8086 and then not Is_Generic_Type (Act_T)
8087 and then not Is_Derived_Type (Act_T)
8088 and then No (Full_View (Root_Type (Act_T)))
8090 Error_Msg_N ("premature use of private type", Actual);
8092 elsif Has_Private_Component (Act_T) then
8094 ("premature use of type with private component", Actual);
8097 Set_Instance_Of (A_Gen_T, Act_T);
8099 -- If the type is generic, the class-wide type may also be used
8101 if Is_Tagged_Type (A_Gen_T)
8102 and then Is_Tagged_Type (Act_T)
8103 and then not Is_Class_Wide_Type (A_Gen_T)
8105 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
8106 Class_Wide_Type (Act_T));
8109 if not Is_Abstract (A_Gen_T)
8110 and then Is_Abstract (Act_T)
8113 ("actual of non-abstract formal cannot be abstract", Actual);
8116 if Is_Scalar_Type (Gen_T) then
8117 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
8122 when N_Formal_Private_Type_Definition =>
8123 Validate_Private_Type_Instance;
8125 when N_Formal_Derived_Type_Definition =>
8126 Validate_Derived_Type_Instance;
8128 when N_Formal_Discrete_Type_Definition =>
8129 if not Is_Discrete_Type (Act_T) then
8131 ("expect discrete type in instantiation of&", Actual, Gen_T);
8132 Abandon_Instantiation (Actual);
8135 when N_Formal_Signed_Integer_Type_Definition =>
8136 if not Is_Signed_Integer_Type (Act_T) then
8138 ("expect signed integer type in instantiation of&",
8140 Abandon_Instantiation (Actual);
8143 when N_Formal_Modular_Type_Definition =>
8144 if not Is_Modular_Integer_Type (Act_T) then
8146 ("expect modular type in instantiation of &", Actual, Gen_T);
8147 Abandon_Instantiation (Actual);
8150 when N_Formal_Floating_Point_Definition =>
8151 if not Is_Floating_Point_Type (Act_T) then
8153 ("expect float type in instantiation of &", Actual, Gen_T);
8154 Abandon_Instantiation (Actual);
8157 when N_Formal_Ordinary_Fixed_Point_Definition =>
8158 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
8160 ("expect ordinary fixed point type in instantiation of &",
8162 Abandon_Instantiation (Actual);
8165 when N_Formal_Decimal_Fixed_Point_Definition =>
8166 if not Is_Decimal_Fixed_Point_Type (Act_T) then
8168 ("expect decimal type in instantiation of &",
8170 Abandon_Instantiation (Actual);
8173 when N_Array_Type_Definition =>
8174 Validate_Array_Type_Instance;
8176 when N_Access_To_Object_Definition =>
8177 Validate_Access_Type_Instance;
8179 when N_Access_Function_Definition |
8180 N_Access_Procedure_Definition =>
8181 Validate_Access_Subprogram_Instance;
8184 raise Program_Error;
8189 Make_Subtype_Declaration (Loc,
8190 Defining_Identifier => New_Copy (Gen_T),
8191 Subtype_Indication => New_Reference_To (Act_T, Loc));
8193 if Is_Private_Type (Act_T) then
8194 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8196 elsif Is_Access_Type (Act_T)
8197 and then Is_Private_Type (Designated_Type (Act_T))
8199 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8202 -- Flag actual derived types so their elaboration produces the
8203 -- appropriate renamings for the primitive operations of the ancestor.
8204 -- Flag actual for formal private types as well, to determine whether
8205 -- operations in the private part may override inherited operations.
8207 if Nkind (Def) = N_Formal_Derived_Type_Definition
8208 or else Nkind (Def) = N_Formal_Private_Type_Definition
8210 Set_Generic_Parent_Type (Decl_Node, Ancestor);
8214 end Instantiate_Type;
8216 ---------------------
8217 -- Is_In_Main_Unit --
8218 ---------------------
8220 function Is_In_Main_Unit (N : Node_Id) return Boolean is
8221 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
8223 Current_Unit : Node_Id;
8226 if Unum = Main_Unit then
8229 -- If the current unit is a subunit then it is either the main unit
8230 -- or is being compiled as part of the main unit.
8232 elsif Nkind (N) = N_Compilation_Unit then
8233 return Nkind (Unit (N)) = N_Subunit;
8236 Current_Unit := Parent (N);
8237 while Present (Current_Unit)
8238 and then Nkind (Current_Unit) /= N_Compilation_Unit
8240 Current_Unit := Parent (Current_Unit);
8243 -- The instantiation node is in the main unit, or else the current
8244 -- node (perhaps as the result of nested instantiations) is in the
8245 -- main unit, or in the declaration of the main unit, which in this
8246 -- last case must be a body.
8248 return Unum = Main_Unit
8249 or else Current_Unit = Cunit (Main_Unit)
8250 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
8251 or else (Present (Library_Unit (Current_Unit))
8252 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
8253 end Is_In_Main_Unit;
8255 ----------------------------
8256 -- Load_Parent_Of_Generic --
8257 ----------------------------
8259 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
8260 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
8261 Save_Style_Check : constant Boolean := Style_Check;
8262 True_Parent : Node_Id;
8263 Inst_Node : Node_Id;
8267 if not In_Same_Source_Unit (N, Spec)
8268 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
8269 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
8270 and then not Is_In_Main_Unit (Spec))
8272 -- Find body of parent of spec, and analyze it. A special case
8273 -- arises when the parent is an instantiation, that is to say when
8274 -- we are currently instantiating a nested generic. In that case,
8275 -- there is no separate file for the body of the enclosing instance.
8276 -- Instead, the enclosing body must be instantiated as if it were
8277 -- a pending instantiation, in order to produce the body for the
8278 -- nested generic we require now. Note that in that case the
8279 -- generic may be defined in a package body, the instance defined
8280 -- in the same package body, and the original enclosing body may not
8281 -- be in the main unit.
8283 True_Parent := Parent (Spec);
8286 while Present (True_Parent)
8287 and then Nkind (True_Parent) /= N_Compilation_Unit
8289 if Nkind (True_Parent) = N_Package_Declaration
8291 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
8293 -- Parent is a compilation unit that is an instantiation.
8294 -- Instantiation node has been replaced with package decl.
8296 Inst_Node := Original_Node (True_Parent);
8299 elsif Nkind (True_Parent) = N_Package_Declaration
8300 and then Present (Generic_Parent (Specification (True_Parent)))
8301 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
8303 -- Parent is an instantiation within another specification.
8304 -- Declaration for instance has been inserted before original
8305 -- instantiation node. A direct link would be preferable?
8307 Inst_Node := Next (True_Parent);
8309 while Present (Inst_Node)
8310 and then Nkind (Inst_Node) /= N_Package_Instantiation
8315 -- If the instance appears within a generic, and the generic
8316 -- unit is defined within a formal package of the enclosing
8317 -- generic, there is no generic body available, and none
8318 -- needed. A more precise test should be used ???
8320 if No (Inst_Node) then
8326 True_Parent := Parent (True_Parent);
8330 -- Case where we are currently instantiating a nested generic
8332 if Present (Inst_Node) then
8333 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
8335 -- Instantiation node and declaration of instantiated package
8336 -- were exchanged when only the declaration was needed.
8337 -- Restore instantiation node before proceeding with body.
8339 Set_Unit (Parent (True_Parent), Inst_Node);
8342 -- Now complete instantiation of enclosing body, if it appears
8343 -- in some other unit. If it appears in the current unit, the
8344 -- body will have been instantiated already.
8346 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
8348 -- We need to determine the expander mode to instantiate
8349 -- the enclosing body. Because the generic body we need
8350 -- may use global entities declared in the enclosing package
8351 -- (including aggregates) it is in general necessary to
8352 -- compile this body with expansion enabled. The exception
8353 -- is if we are within a generic package, in which case
8354 -- the usual generic rule applies.
8357 Exp_Status : Boolean := True;
8361 -- Loop through scopes looking for generic package
8363 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
8364 while Present (Scop)
8365 and then Scop /= Standard_Standard
8367 if Ekind (Scop) = E_Generic_Package then
8368 Exp_Status := False;
8372 Scop := Scope (Scop);
8375 Instantiate_Package_Body
8376 (Pending_Body_Info'(
8377 Inst_Node, True_Parent, Exp_Status,
8378 Get_Code_Unit (Sloc (Inst_Node))));
8382 -- Case where we are not instantiating a nested generic
8385 Opt.Style_Check := False;
8386 Expander_Mode_Save_And_Set (True);
8387 Load_Needed_Body (Comp_Unit, OK);
8388 Opt.Style_Check := Save_Style_Check;
8389 Expander_Mode_Restore;
8392 and then Unit_Requires_Body (Defining_Entity (Spec))
8395 Bname : constant Unit_Name_Type :=
8396 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8399 Error_Msg_Unit_1 := Bname;
8400 Error_Msg_N ("this instantiation requires$!", N);
8402 Get_File_Name (Bname, Subunit => False);
8403 Error_Msg_N ("\but file{ was not found!", N);
8404 raise Unrecoverable_Error;
8410 -- If loading the parent of the generic caused an instantiation
8411 -- circularity, we abandon compilation at this point, because
8412 -- otherwise in some cases we get into trouble with infinite
8413 -- recursions after this point.
8415 if Circularity_Detected then
8416 raise Unrecoverable_Error;
8418 end Load_Parent_Of_Generic;
8420 -----------------------
8421 -- Move_Freeze_Nodes --
8422 -----------------------
8424 procedure Move_Freeze_Nodes
8425 (Out_Of : Entity_Id;
8430 Next_Decl : Node_Id;
8431 Next_Node : Node_Id := After;
8434 function Is_Outer_Type (T : Entity_Id) return Boolean;
8435 -- Check whether entity is declared in a scope external to that
8436 -- of the generic unit.
8442 function Is_Outer_Type (T : Entity_Id) return Boolean is
8443 Scop : Entity_Id := Scope (T);
8446 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8450 while Scop /= Standard_Standard loop
8452 if Scop = Out_Of then
8455 Scop := Scope (Scop);
8463 -- Start of processing for Move_Freeze_Nodes
8470 -- First remove the freeze nodes that may appear before all other
8474 while Present (Decl)
8475 and then Nkind (Decl) = N_Freeze_Entity
8476 and then Is_Outer_Type (Entity (Decl))
8478 Decl := Remove_Head (L);
8479 Insert_After (Next_Node, Decl);
8480 Set_Analyzed (Decl, False);
8485 -- Next scan the list of declarations and remove each freeze node that
8486 -- appears ahead of the current node.
8488 while Present (Decl) loop
8489 while Present (Next (Decl))
8490 and then Nkind (Next (Decl)) = N_Freeze_Entity
8491 and then Is_Outer_Type (Entity (Next (Decl)))
8493 Next_Decl := Remove_Next (Decl);
8494 Insert_After (Next_Node, Next_Decl);
8495 Set_Analyzed (Next_Decl, False);
8496 Next_Node := Next_Decl;
8499 -- If the declaration is a nested package or concurrent type, then
8500 -- recurse. Nested generic packages will have been processed from the
8503 if Nkind (Decl) = N_Package_Declaration then
8504 Spec := Specification (Decl);
8506 elsif Nkind (Decl) = N_Task_Type_Declaration then
8507 Spec := Task_Definition (Decl);
8509 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8510 Spec := Protected_Definition (Decl);
8516 if Present (Spec) then
8517 Move_Freeze_Nodes (Out_Of, Next_Node,
8518 Visible_Declarations (Spec));
8519 Move_Freeze_Nodes (Out_Of, Next_Node,
8520 Private_Declarations (Spec));
8525 end Move_Freeze_Nodes;
8531 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8533 return Generic_Renamings.Table (E).Next_In_HTable;
8536 ------------------------
8537 -- Preanalyze_Actuals --
8538 ------------------------
8540 procedure Pre_Analyze_Actuals (N : Node_Id) is
8543 Errs : constant Int := Serious_Errors_Detected;
8546 Assoc := First (Generic_Associations (N));
8548 while Present (Assoc) loop
8549 Act := Explicit_Generic_Actual_Parameter (Assoc);
8551 -- Within a nested instantiation, a defaulted actual is an
8552 -- empty association, so nothing to analyze. If the actual for
8553 -- a subprogram is an attribute, analyze prefix only, because
8554 -- actual is not a complete attribute reference.
8556 -- If actual is an allocator, analyze expression only. The full
8557 -- analysis can generate code, and if the instance is a compilation
8558 -- unit we have to wait until the package instance is installed to
8559 -- have a proper place to insert this code.
8561 -- String literals may be operators, but at this point we do not
8562 -- know whether the actual is a formal subprogram or a string.
8567 elsif Nkind (Act) = N_Attribute_Reference then
8568 Analyze (Prefix (Act));
8570 elsif Nkind (Act) = N_Explicit_Dereference then
8571 Analyze (Prefix (Act));
8573 elsif Nkind (Act) = N_Allocator then
8575 Expr : constant Node_Id := Expression (Act);
8578 if Nkind (Expr) = N_Subtype_Indication then
8579 Analyze (Subtype_Mark (Expr));
8580 Analyze_List (Constraints (Constraint (Expr)));
8586 elsif Nkind (Act) /= N_Operator_Symbol then
8590 if Errs /= Serious_Errors_Detected then
8591 Abandon_Instantiation (Act);
8596 end Pre_Analyze_Actuals;
8602 procedure Remove_Parent (In_Body : Boolean := False) is
8603 S : Entity_Id := Current_Scope;
8609 -- After child instantiation is complete, remove from scope stack
8610 -- the extra copy of the current scope, and then remove parent
8616 while Current_Scope /= S loop
8618 End_Package_Scope (Current_Scope);
8620 if In_Open_Scopes (P) then
8621 E := First_Entity (P);
8623 while Present (E) loop
8624 Set_Is_Immediately_Visible (E, True);
8628 if Is_Generic_Instance (Current_Scope)
8629 and then P /= Current_Scope
8631 -- We are within an instance of some sibling. Retain
8632 -- visibility of parent, for proper subsequent cleanup.
8634 Set_In_Private_Part (P);
8637 elsif not In_Open_Scopes (Scope (P)) then
8638 Set_Is_Immediately_Visible (P, False);
8642 -- Reset visibility of entities in the enclosing scope.
8644 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8645 Hidden := First_Elmt (Hidden_Entities);
8647 while Present (Hidden) loop
8648 Set_Is_Immediately_Visible (Node (Hidden), True);
8653 -- Each body is analyzed separately, and there is no context
8654 -- that needs preserving from one body instance to the next,
8655 -- so remove all parent scopes that have been installed.
8657 while Present (S) loop
8658 End_Package_Scope (S);
8659 Set_Is_Immediately_Visible (S, False);
8661 exit when S = Standard_Standard;
8671 procedure Restore_Env is
8672 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8675 Ada_83 := Saved.Ada_83;
8677 if No (Current_Instantiated_Parent.Act_Id) then
8679 -- Restore environment after subprogram inlining
8681 Restore_Private_Views (Empty);
8684 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8685 Exchanged_Views := Saved.Exchanged_Views;
8686 Hidden_Entities := Saved.Hidden_Entities;
8687 Current_Sem_Unit := Saved.Current_Sem_Unit;
8689 Instance_Envs.Decrement_Last;
8692 ---------------------------
8693 -- Restore_Private_Views --
8694 ---------------------------
8696 procedure Restore_Private_Views
8697 (Pack_Id : Entity_Id;
8698 Is_Package : Boolean := True)
8707 M := First_Elmt (Exchanged_Views);
8708 while Present (M) loop
8711 -- Subtypes of types whose views have been exchanged, and that
8712 -- are defined within the instance, were not on the list of
8713 -- Private_Dependents on entry to the instance, so they have to
8714 -- be exchanged explicitly now, in order to remain consistent with
8715 -- the view of the parent type.
8717 if Ekind (Typ) = E_Private_Type
8718 or else Ekind (Typ) = E_Limited_Private_Type
8719 or else Ekind (Typ) = E_Record_Type_With_Private
8721 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8723 while Present (Dep_Elmt) loop
8724 Dep_Typ := Node (Dep_Elmt);
8726 if Scope (Dep_Typ) = Pack_Id
8727 and then Present (Full_View (Dep_Typ))
8729 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8730 Exchange_Declarations (Dep_Typ);
8733 Next_Elmt (Dep_Elmt);
8737 Exchange_Declarations (Node (M));
8741 if No (Pack_Id) then
8745 -- Make the generic formal parameters private, and make the formal
8746 -- types into subtypes of the actuals again.
8748 E := First_Entity (Pack_Id);
8750 while Present (E) loop
8751 Set_Is_Hidden (E, True);
8754 and then Nkind (Parent (E)) = N_Subtype_Declaration
8756 Set_Is_Generic_Actual_Type (E, False);
8758 -- An unusual case of aliasing: the actual may also be directly
8759 -- visible in the generic, and be private there, while it is
8760 -- fully visible in the context of the instance. The internal
8761 -- subtype is private in the instance, but has full visibility
8762 -- like its parent in the enclosing scope. This enforces the
8763 -- invariant that the privacy status of all private dependents of
8764 -- a type coincide with that of the parent type. This can only
8765 -- happen when a generic child unit is instantiated within a
8768 if Is_Private_Type (E)
8769 and then not Is_Private_Type (Etype (E))
8771 Exchange_Declarations (E);
8774 elsif Ekind (E) = E_Package then
8776 -- The end of the renaming list is the renaming of the generic
8777 -- package itself. If the instance is a subprogram, all entities
8778 -- in the corresponding package are renamings. If this entity is
8779 -- a formal package, make its own formals private as well. The
8780 -- actual in this case is itself the renaming of an instantation.
8781 -- If the entity is not a package renaming, it is the entity
8782 -- created to validate formal package actuals: ignore.
8784 -- If the actual is itself a formal package for the enclosing
8785 -- generic, or the actual for such a formal package, it remains
8786 -- visible after the current instance, and therefore nothing
8787 -- needs to be done either, except to keep it accessible.
8790 and then Renamed_Object (E) = Pack_Id
8794 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8797 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8798 Set_Is_Hidden (E, False);
8802 Act_P : constant Entity_Id := Renamed_Object (E);
8806 Id := First_Entity (Act_P);
8808 and then Id /= First_Private_Entity (Act_P)
8810 Set_Is_Hidden (Id, True);
8811 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8812 exit when Ekind (Id) = E_Package
8813 and then Renamed_Object (Id) = Act_P;
8824 end Restore_Private_Views;
8831 (Gen_Unit : Entity_Id;
8832 Act_Unit : Entity_Id)
8836 Set_Instance_Env (Gen_Unit, Act_Unit);
8839 ----------------------------
8840 -- Save_Global_References --
8841 ----------------------------
8843 procedure Save_Global_References (N : Node_Id) is
8844 Gen_Scope : Entity_Id;
8848 function Is_Global (E : Entity_Id) return Boolean;
8849 -- Check whether entity is defined outside of generic unit.
8850 -- Examine the scope of an entity, and the scope of the scope,
8851 -- etc, until we find either Standard, in which case the entity
8852 -- is global, or the generic unit itself, which indicates that
8853 -- the entity is local. If the entity is the generic unit itself,
8854 -- as in the case of a recursive call, or the enclosing generic unit,
8855 -- if different from the current scope, then it is local as well,
8856 -- because it will be replaced at the point of instantiation. On
8857 -- the other hand, if it is a reference to a child unit of a common
8858 -- ancestor, which appears in an instantiation, it is global because
8859 -- it is used to denote a specific compilation unit at the time the
8860 -- instantiations will be analyzed.
8862 procedure Reset_Entity (N : Node_Id);
8863 -- Save semantic information on global entity, so that it is not
8864 -- resolved again at instantiation time.
8866 procedure Save_Entity_Descendants (N : Node_Id);
8867 -- Apply Save_Global_References to the two syntactic descendants of
8868 -- non-terminal nodes that carry an Associated_Node and are processed
8869 -- through Reset_Entity. Once the global entity (if any) has been
8870 -- captured together with its type, only two syntactic descendants
8871 -- need to be traversed to complete the processing of the tree rooted
8872 -- at N. This applies to Selected_Components, Expanded_Names, and to
8873 -- Operator nodes. N can also be a character literal, identifier, or
8874 -- operator symbol node, but the call has no effect in these cases.
8876 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8877 -- Default actuals in nested instances must be handled specially
8878 -- because there is no link to them from the original tree. When an
8879 -- actual subprogram is given by a default, we add an explicit generic
8880 -- association for it in the instantiation node. When we save the
8881 -- global references on the name of the instance, we recover the list
8882 -- of generic associations, and add an explicit one to the original
8883 -- generic tree, through which a global actual can be preserved.
8884 -- Similarly, if a child unit is instantiated within a sibling, in the
8885 -- context of the parent, we must preserve the identifier of the parent
8886 -- so that it can be properly resolved in a subsequent instantiation.
8888 procedure Save_Global_Descendant (D : Union_Id);
8889 -- Apply Save_Global_References recursively to the descendents of
8892 procedure Save_References (N : Node_Id);
8893 -- This is the recursive procedure that does the work, once the
8894 -- enclosing generic scope has been established.
8900 function Is_Global (E : Entity_Id) return Boolean is
8901 Se : Entity_Id := Scope (E);
8903 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8904 -- Determine whether the parent node of a reference to a child unit
8905 -- denotes an instantiation or a formal package, in which case the
8906 -- reference to the child unit is global, even if it appears within
8907 -- the current scope (e.g. when the instance appears within the body
8910 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8912 return (Nkind (Decl) in N_Generic_Instantiation
8914 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8915 end Is_Instance_Node;
8917 -- Start of processing for Is_Global
8920 if E = Gen_Scope then
8923 elsif E = Standard_Standard then
8926 elsif Is_Child_Unit (E)
8927 and then (Is_Instance_Node (Parent (N2))
8928 or else (Nkind (Parent (N2)) = N_Expanded_Name
8929 and then N2 = Selector_Name (Parent (N2))
8930 and then Is_Instance_Node (Parent (Parent (N2)))))
8935 while Se /= Gen_Scope loop
8936 if Se = Standard_Standard then
8951 procedure Reset_Entity (N : Node_Id) is
8953 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8954 -- The type of N2 is global to the generic unit. Save the
8955 -- type in the generic node.
8957 function Top_Ancestor (E : Entity_Id) return Entity_Id;
8958 -- Find the ultimate ancestor of the current unit. If it is
8959 -- not a generic unit, then the name of the current unit
8960 -- in the prefix of an expanded name must be replaced with
8961 -- its generic homonym to ensure that it will be properly
8962 -- resolved in an instance.
8964 ---------------------
8965 -- Set_Global_Type --
8966 ---------------------
8968 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8969 Typ : constant Entity_Id := Etype (N2);
8975 and then Has_Private_View (Entity (N))
8977 -- If the entity of N is not the associated node, this is
8978 -- a nested generic and it has an associated node as well,
8979 -- whose type is already the full view (see below). Indicate
8980 -- that the original node has a private view.
8982 Set_Has_Private_View (N);
8985 -- If not a private type, nothing else to do
8987 if not Is_Private_Type (Typ) then
8988 if Is_Array_Type (Typ)
8989 and then Is_Private_Type (Component_Type (Typ))
8991 Set_Has_Private_View (N);
8994 -- If it is a derivation of a private type in a context where
8995 -- no full view is needed, nothing to do either.
8997 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9000 -- Otherwise mark the type for flipping and use the full_view
9004 Set_Has_Private_View (N);
9006 if Present (Full_View (Typ)) then
9007 Set_Etype (N2, Full_View (Typ));
9010 end Set_Global_Type;
9016 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9017 Par : Entity_Id := E;
9020 while Is_Child_Unit (Par) loop
9027 -- Start of processing for Reset_Entity
9030 N2 := Get_Associated_Node (N);
9034 if Is_Global (E) then
9035 Set_Global_Type (N, N2);
9037 elsif Nkind (N) = N_Op_Concat
9038 and then Is_Generic_Type (Etype (N2))
9040 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9041 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9042 and then Is_Intrinsic_Subprogram (E)
9047 -- Entity is local. Mark generic node as unresolved.
9048 -- Note that now it does not have an entity.
9050 Set_Associated_Node (N, Empty);
9051 Set_Etype (N, Empty);
9054 if (Nkind (Parent (N)) = N_Package_Instantiation
9055 or else Nkind (Parent (N)) = N_Function_Instantiation
9056 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9057 and then N = Name (Parent (N))
9059 Save_Global_Defaults (Parent (N), Parent (N2));
9062 elsif Nkind (Parent (N)) = N_Selected_Component
9063 and then Nkind (Parent (N2)) = N_Expanded_Name
9066 if Is_Global (Entity (Parent (N2))) then
9067 Change_Selected_Component_To_Expanded_Name (Parent (N));
9068 Set_Associated_Node (Parent (N), Parent (N2));
9069 Set_Global_Type (Parent (N), Parent (N2));
9070 Save_Entity_Descendants (N);
9072 -- If this is a reference to the current generic entity,
9073 -- replace by the name of the generic homonym of the current
9074 -- package. This is because in an instantiation Par.P.Q will
9075 -- not resolve to the name of the instance, whose enclosing
9076 -- scope is not necessarily Par. We use the generic homonym
9077 -- rather that the name of the generic itself, because it may
9078 -- be hidden by a local declaration.
9080 elsif In_Open_Scopes (Entity (Parent (N2)))
9082 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9084 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9085 Rewrite (Parent (N),
9086 Make_Identifier (Sloc (N),
9088 Chars (Generic_Homonym (Entity (Parent (N2))))));
9090 Rewrite (Parent (N),
9091 Make_Identifier (Sloc (N),
9092 Chars => Chars (Selector_Name (Parent (N2)))));
9096 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9097 or else Nkind (Parent (Parent (N)))
9098 = N_Function_Instantiation
9099 or else Nkind (Parent (Parent (N)))
9100 = N_Procedure_Instantiation)
9101 and then Parent (N) = Name (Parent (Parent (N)))
9103 Save_Global_Defaults
9104 (Parent (Parent (N)), Parent (Parent ((N2))));
9107 -- A selected component may denote a static constant that has
9108 -- been folded. Make the same replacement in original tree.
9110 elsif Nkind (Parent (N)) = N_Selected_Component
9111 and then (Nkind (Parent (N2)) = N_Integer_Literal
9112 or else Nkind (Parent (N2)) = N_Real_Literal)
9114 Rewrite (Parent (N),
9115 New_Copy (Parent (N2)));
9116 Set_Analyzed (Parent (N), False);
9118 -- A selected component may be transformed into a parameterless
9119 -- function call. If the called entity is global, rewrite the
9120 -- node appropriately, i.e. as an extended name for the global
9123 elsif Nkind (Parent (N)) = N_Selected_Component
9124 and then Nkind (Parent (N2)) = N_Function_Call
9125 and then Is_Global (Entity (Name (Parent (N2))))
9127 Change_Selected_Component_To_Expanded_Name (Parent (N));
9128 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9129 Set_Global_Type (Parent (N), Name (Parent (N2)));
9130 Save_Entity_Descendants (N);
9133 -- Entity is local. Reset in generic unit, so that node
9134 -- is resolved anew at the point of instantiation.
9136 Set_Associated_Node (N, Empty);
9137 Set_Etype (N, Empty);
9141 -----------------------------
9142 -- Save_Entity_Descendants --
9143 -----------------------------
9145 procedure Save_Entity_Descendants (N : Node_Id) is
9149 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9150 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9153 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9155 when N_Expanded_Name | N_Selected_Component =>
9156 Save_Global_Descendant (Union_Id (Prefix (N)));
9157 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9159 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9163 raise Program_Error;
9165 end Save_Entity_Descendants;
9167 --------------------------
9168 -- Save_Global_Defaults --
9169 --------------------------
9171 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9172 Loc : constant Source_Ptr := Sloc (N1);
9173 Assoc2 : constant List_Id := Generic_Associations (N2);
9174 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9184 Assoc1 := Generic_Associations (N1);
9186 if Present (Assoc1) then
9187 Act1 := First (Assoc1);
9190 Set_Generic_Associations (N1, New_List);
9191 Assoc1 := Generic_Associations (N1);
9194 if Present (Assoc2) then
9195 Act2 := First (Assoc2);
9200 while Present (Act1) and then Present (Act2) loop
9205 -- Find the associations added for default suprograms.
9207 if Present (Act2) then
9208 while Nkind (Act2) /= N_Generic_Association
9209 or else No (Entity (Selector_Name (Act2)))
9210 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9215 -- Add a similar association if the default is global. The
9216 -- renaming declaration for the actual has been analyzed, and
9217 -- its alias is the program it renames. Link the actual in the
9218 -- original generic tree with the node in the analyzed tree.
9220 while Present (Act2) loop
9221 Subp := Entity (Selector_Name (Act2));
9222 Def := Explicit_Generic_Actual_Parameter (Act2);
9224 -- Following test is defence against rubbish errors
9226 if No (Alias (Subp)) then
9230 -- Retrieve the resolved actual from the renaming declaration
9231 -- created for the instantiated formal.
9233 Actual := Entity (Name (Parent (Parent (Subp))));
9234 Set_Entity (Def, Actual);
9235 Set_Etype (Def, Etype (Actual));
9237 if Is_Global (Actual) then
9239 Make_Generic_Association (Loc,
9240 Selector_Name => New_Occurrence_Of (Subp, Loc),
9241 Explicit_Generic_Actual_Parameter =>
9242 New_Occurrence_Of (Actual, Loc));
9245 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9247 Append (Ndec, Assoc1);
9249 -- If there are other defaults, add a dummy association
9250 -- in case there are other defaulted formals with the same
9253 elsif Present (Next (Act2)) then
9255 Make_Generic_Association (Loc,
9256 Selector_Name => New_Occurrence_Of (Subp, Loc),
9257 Explicit_Generic_Actual_Parameter => Empty);
9259 Append (Ndec, Assoc1);
9266 if Nkind (Name (N1)) = N_Identifier
9267 and then Is_Child_Unit (Gen_Id)
9268 and then Is_Global (Gen_Id)
9269 and then Is_Generic_Unit (Scope (Gen_Id))
9270 and then In_Open_Scopes (Scope (Gen_Id))
9272 -- This is an instantiation of a child unit within a sibling,
9273 -- so that the generic parent is in scope. An eventual instance
9274 -- must occur within the scope of an instance of the parent.
9275 -- Make name in instance into an expanded name, to preserve the
9276 -- identifier of the parent, so it can be resolved subsequently.
9279 Make_Expanded_Name (Loc,
9280 Chars => Chars (Gen_Id),
9281 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9282 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9283 Set_Entity (Name (N2), Gen_Id);
9286 Make_Expanded_Name (Loc,
9287 Chars => Chars (Gen_Id),
9288 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9289 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9291 Set_Associated_Node (Name (N1), Name (N2));
9292 Set_Associated_Node (Prefix (Name (N1)), Empty);
9294 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9295 Set_Etype (Name (N1), Etype (Gen_Id));
9298 end Save_Global_Defaults;
9300 ----------------------------
9301 -- Save_Global_Descendant --
9302 ----------------------------
9304 procedure Save_Global_Descendant (D : Union_Id) is
9308 if D in Node_Range then
9309 if D = Union_Id (Empty) then
9312 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9313 Save_References (Node_Id (D));
9316 elsif D in List_Range then
9317 if D = Union_Id (No_List)
9318 or else Is_Empty_List (List_Id (D))
9323 N1 := First (List_Id (D));
9324 while Present (N1) loop
9325 Save_References (N1);
9330 -- Element list or other non-node field, nothing to do
9335 end Save_Global_Descendant;
9337 ---------------------
9338 -- Save_References --
9339 ---------------------
9341 -- This is the recursive procedure that does the work, once the
9342 -- enclosing generic scope has been established. We have to treat
9343 -- specially a number of node rewritings that are required by semantic
9344 -- processing and which change the kind of nodes in the generic copy:
9345 -- typically constant-folding, replacing an operator node by a string
9346 -- literal, or a selected component by an expanded name. In each of
9347 -- those cases, the transformation is propagated to the generic unit.
9349 procedure Save_References (N : Node_Id) is
9354 elsif Nkind (N) = N_Character_Literal
9355 or else Nkind (N) = N_Operator_Symbol
9357 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9360 elsif Nkind (N) = N_Operator_Symbol
9361 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9363 Change_Operator_Symbol_To_String_Literal (N);
9366 elsif Nkind (N) in N_Op then
9368 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9370 if Nkind (N) = N_Op_Concat then
9371 Set_Is_Component_Left_Opnd (N,
9372 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9374 Set_Is_Component_Right_Opnd (N,
9375 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9380 -- Node may be transformed into call to a user-defined operator
9382 N2 := Get_Associated_Node (N);
9384 if Nkind (N2) = N_Function_Call then
9385 E := Entity (Name (N2));
9388 and then Is_Global (E)
9390 Set_Etype (N, Etype (N2));
9392 Set_Associated_Node (N, Empty);
9393 Set_Etype (N, Empty);
9396 elsif Nkind (N2) = N_Integer_Literal
9397 or else Nkind (N2) = N_Real_Literal
9398 or else Nkind (N2) = N_String_Literal
9400 -- Operation was constant-folded, perform the same
9401 -- replacement in generic.
9403 Rewrite (N, New_Copy (N2));
9404 Set_Analyzed (N, False);
9406 elsif Nkind (N2) = N_Identifier
9407 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9409 -- Same if call was folded into a literal, but in this
9410 -- case retain the entity to avoid spurious ambiguities
9411 -- if id is overloaded at the point of instantiation or
9414 Rewrite (N, New_Copy (N2));
9415 Set_Associated_Node (N, N2);
9416 Set_Analyzed (N, False);
9420 -- Complete the check on operands, if node has not been
9423 if Nkind (N) in N_Op then
9424 Save_Entity_Descendants (N);
9427 elsif Nkind (N) = N_Identifier then
9428 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9430 -- If this is a discriminant reference, always save it.
9431 -- It is used in the instance to find the corresponding
9432 -- discriminant positionally rather than by name.
9434 Set_Original_Discriminant
9435 (N, Original_Discriminant (Get_Associated_Node (N)));
9439 N2 := Get_Associated_Node (N);
9441 if Nkind (N2) = N_Function_Call then
9442 E := Entity (Name (N2));
9444 -- Name resolves to a call to parameterless function.
9445 -- If original entity is global, mark node as resolved.
9448 and then Is_Global (E)
9450 Set_Etype (N, Etype (N2));
9452 Set_Associated_Node (N, Empty);
9453 Set_Etype (N, Empty);
9457 Nkind (N2) = N_Integer_Literal or else
9458 Nkind (N2) = N_Real_Literal or else
9459 Nkind (N2) = N_String_Literal
9461 -- Name resolves to named number that is constant-folded,
9462 -- or to string literal from concatenation.
9463 -- Perform the same replacement in generic.
9465 Rewrite (N, New_Copy (N2));
9466 Set_Analyzed (N, False);
9468 elsif Nkind (N2) = N_Explicit_Dereference then
9470 -- An identifier is rewritten as a dereference if it is
9471 -- the prefix in a selected component, and it denotes an
9472 -- access to a composite type, or a parameterless function
9473 -- call that returns an access type.
9475 -- Check whether corresponding entity in prefix is global.
9477 if Is_Entity_Name (Prefix (N2))
9478 and then Present (Entity (Prefix (N2)))
9479 and then Is_Global (Entity (Prefix (N2)))
9482 Make_Explicit_Dereference (Sloc (N),
9483 Prefix => Make_Identifier (Sloc (N),
9484 Chars => Chars (N))));
9485 Set_Associated_Node (Prefix (N), Prefix (N2));
9487 elsif Nkind (Prefix (N2)) = N_Function_Call
9488 and then Is_Global (Entity (Name (Prefix (N2))))
9491 Make_Explicit_Dereference (Sloc (N),
9492 Prefix => Make_Function_Call (Sloc (N),
9494 Make_Identifier (Sloc (N),
9495 Chars => Chars (N)))));
9498 (Name (Prefix (N)), Name (Prefix (N2)));
9501 Set_Associated_Node (N, Empty);
9502 Set_Etype (N, Empty);
9505 -- The subtype mark of a nominally unconstrained object
9506 -- is rewritten as a subtype indication using the bounds
9507 -- of the expression. Recover the original subtype mark.
9509 elsif Nkind (N2) = N_Subtype_Indication
9510 and then Is_Entity_Name (Original_Node (N2))
9512 Set_Associated_Node (N, Original_Node (N2));
9520 elsif Nkind (N) in N_Entity then
9525 use Atree.Unchecked_Access;
9526 -- This code section is part of implementing an untyped tree
9527 -- traversal, so it needs direct access to node fields.
9530 if Nkind (N) = N_Aggregate
9532 Nkind (N) = N_Extension_Aggregate
9534 N2 := Get_Associated_Node (N);
9537 or else No (Etype (N2))
9538 or else not Is_Global (Etype (N2))
9540 Set_Associated_Node (N, Empty);
9543 Save_Global_Descendant (Field1 (N));
9544 Save_Global_Descendant (Field2 (N));
9545 Save_Global_Descendant (Field3 (N));
9546 Save_Global_Descendant (Field5 (N));
9548 -- All other cases than aggregates
9551 Save_Global_Descendant (Field1 (N));
9552 Save_Global_Descendant (Field2 (N));
9553 Save_Global_Descendant (Field3 (N));
9554 Save_Global_Descendant (Field4 (N));
9555 Save_Global_Descendant (Field5 (N));
9559 end Save_References;
9561 -- Start of processing for Save_Global_References
9564 Gen_Scope := Current_Scope;
9566 -- If the generic unit is a child unit, references to entities in
9567 -- the parent are treated as local, because they will be resolved
9568 -- anew in the context of the instance of the parent.
9570 while Is_Child_Unit (Gen_Scope)
9571 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9573 Gen_Scope := Scope (Gen_Scope);
9576 Save_References (N);
9577 end Save_Global_References;
9579 --------------------------------------
9580 -- Set_Copied_Sloc_For_Inlined_Body --
9581 --------------------------------------
9583 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9585 Create_Instantiation_Source (N, E, True, S_Adjustment);
9586 end Set_Copied_Sloc_For_Inlined_Body;
9588 ---------------------
9589 -- Set_Instance_Of --
9590 ---------------------
9592 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9594 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9595 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9596 Generic_Renamings.Increment_Last;
9597 end Set_Instance_Of;
9599 --------------------
9600 -- Set_Next_Assoc --
9601 --------------------
9603 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9605 Generic_Renamings.Table (E).Next_In_HTable := Next;
9612 procedure Start_Generic is
9614 -- ??? I am sure more things could be factored out in this
9615 -- routine. Should probably be done at a later stage.
9617 Generic_Flags.Increment_Last;
9618 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9619 Inside_A_Generic := True;
9621 Expander_Mode_Save_And_Set (False);
9624 ----------------------
9625 -- Set_Instance_Env --
9626 ----------------------
9628 procedure Set_Instance_Env
9629 (Gen_Unit : Entity_Id;
9630 Act_Unit : Entity_Id)
9634 -- Regardless of the current mode, predefined units are analyzed in
9635 -- Ada95 mode, and Ada83 checks don't apply.
9637 if Is_Internal_File_Name
9638 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
9639 Renamings_Included => True) then
9643 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
9644 end Set_Instance_Env;
9650 procedure Switch_View (T : Entity_Id) is
9651 BT : constant Entity_Id := Base_Type (T);
9652 Priv_Elmt : Elmt_Id := No_Elmt;
9653 Priv_Sub : Entity_Id;
9656 -- T may be private but its base type may have been exchanged through
9657 -- some other occurrence, in which case there is nothing to switch.
9659 if not Is_Private_Type (BT) then
9663 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9665 if Present (Full_View (BT)) then
9666 Append_Elmt (Full_View (BT), Exchanged_Views);
9667 Exchange_Declarations (BT);
9670 while Present (Priv_Elmt) loop
9671 Priv_Sub := (Node (Priv_Elmt));
9673 -- We avoid flipping the subtype if the Etype of its full
9674 -- view is private because this would result in a malformed
9675 -- subtype. This occurs when the Etype of the subtype full
9676 -- view is the full view of the base type (and since the
9677 -- base types were just switched, the subtype is pointing
9678 -- to the wrong view). This is currently the case for
9679 -- tagged record types, access types (maybe more?) and
9680 -- needs to be resolved. ???
9682 if Present (Full_View (Priv_Sub))
9683 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
9685 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
9686 Exchange_Declarations (Priv_Sub);
9689 Next_Elmt (Priv_Elmt);
9693 -----------------------------
9694 -- Valid_Default_Attribute --
9695 -----------------------------
9697 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
9698 Attr_Id : constant Attribute_Id :=
9699 Get_Attribute_Id (Attribute_Name (Def));
9700 T : constant Entity_Id := Entity (Prefix (Def));
9701 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
9714 F := First_Formal (Nam);
9715 while Present (F) loop
9721 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
9722 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
9723 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
9724 Attribute_Unbiased_Rounding =>
9727 and then Is_Floating_Point_Type (T);
9729 when Attribute_Image | Attribute_Pred | Attribute_Succ |
9730 Attribute_Value | Attribute_Wide_Image |
9731 Attribute_Wide_Value =>
9732 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9734 when Attribute_Max | Attribute_Min =>
9735 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
9737 when Attribute_Input =>
9738 OK := (Is_Fun and then Num_F = 1);
9740 when Attribute_Output | Attribute_Read | Attribute_Write =>
9741 OK := (not Is_Fun and then Num_F = 2);
9748 Error_Msg_N ("attribute reference has wrong profile for subprogram",
9751 end Valid_Default_Attribute;
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