1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
11 -- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- GNAT was originally developed by the GNAT team at New York University. --
25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
27 ------------------------------------------------------------------------------
29 with Atree; use Atree;
30 with Einfo; use Einfo;
31 with Elists; use Elists;
32 with Errout; use Errout;
33 with Expander; use Expander;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
36 with Freeze; use Freeze;
38 with Inline; use Inline;
40 with Lib.Load; use Lib.Load;
41 with Lib.Xref; use Lib.Xref;
42 with Nlists; use Nlists;
43 with Nmake; use Nmake;
45 with Restrict; use Restrict;
46 with Rtsfind; use Rtsfind;
48 with Sem_Cat; use Sem_Cat;
49 with Sem_Ch3; use Sem_Ch3;
50 with Sem_Ch6; use Sem_Ch6;
51 with Sem_Ch7; use Sem_Ch7;
52 with Sem_Ch8; use Sem_Ch8;
53 with Sem_Ch10; use Sem_Ch10;
54 with Sem_Ch13; use Sem_Ch13;
55 with Sem_Elab; use Sem_Elab;
56 with Sem_Elim; use Sem_Elim;
57 with Sem_Eval; use Sem_Eval;
58 with Sem_Res; use Sem_Res;
59 with Sem_Type; use Sem_Type;
60 with Sem_Util; use Sem_Util;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation (N : Node_Id);
245 pragma No_Return (Abandon_Instantiation);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T : in out Entity_Id;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part (N : Node_Id);
283 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
284 -- This needs comments ???
286 function Analyze_Associations
291 -- At instantiation time, build the list of associations between formals
292 -- and actuals. Each association becomes a renaming declaration for the
293 -- formal entity. F_Copy is the analyzed list of formals in the generic
294 -- copy. It is used to apply legality checks to the actuals. I_Node is the
295 -- instantiation node itself.
297 procedure Analyze_Subprogram_Instantiation
301 procedure Build_Instance_Compilation_Unit_Nodes
305 -- This procedure is used in the case where the generic instance of a
306 -- subprogram body or package body is a library unit. In this case, the
307 -- original library unit node for the generic instantiation must be
308 -- replaced by the resulting generic body, and a link made to a new
309 -- compilation unit node for the generic declaration. The argument N is
310 -- the original generic instantiation. Act_Body and Act_Decl are the body
311 -- and declaration of the instance (either package body and declaration
312 -- nodes or subprogram body and declaration nodes depending on the case).
313 -- On return, the node N has been rewritten with the actual body.
315 procedure Check_Formal_Packages (P_Id : Entity_Id);
316 -- Apply the following to all formal packages in generic associations.
318 procedure Check_Formal_Package_Instance
319 (Formal_Pack : Entity_Id;
320 Actual_Pack : Entity_Id);
321 -- Verify that the actuals of the actual instance match the actuals of
322 -- the template for a formal package that is not declared with a box.
324 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id);
325 -- If the generic is a local entity and the corresponding body has not
326 -- been seen yet, flag enclosing packages to indicate that it will be
327 -- elaborated after the generic body. Subprograms declared in the same
328 -- package cannot be inlined by the front-end because front-end inlining
329 -- requires a strict linear order of elaboration.
331 procedure Check_Hidden_Child_Unit
333 Gen_Unit : Entity_Id;
334 Act_Decl_Id : Entity_Id);
335 -- If the generic unit is an implicit child instance within a parent
336 -- instance, we need to make an explicit test that it is not hidden by
337 -- a child instance of the same name and parent.
339 procedure Check_Private_View (N : Node_Id);
340 -- Check whether the type of a generic entity has a different view between
341 -- the point of generic analysis and the point of instantiation. If the
342 -- view has changed, then at the point of instantiation we restore the
343 -- correct view to perform semantic analysis of the instance, and reset
344 -- the current view after instantiation. The processing is driven by the
345 -- current private status of the type of the node, and Has_Private_View,
346 -- a flag that is set at the point of generic compilation. If view and
347 -- flag are inconsistent then the type is updated appropriately.
349 procedure Check_Generic_Actuals
350 (Instance : Entity_Id;
351 Is_Formal_Box : Boolean);
352 -- Similar to previous one. Check the actuals in the instantiation,
353 -- whose views can change between the point of instantiation and the point
354 -- of instantiation of the body. In addition, mark the generic renamings
355 -- as generic actuals, so that they are not compatible with other actuals.
356 -- Recurse on an actual that is a formal package whose declaration has
359 function Contains_Instance_Of
364 -- Inner is instantiated within the generic Outer. Check whether Inner
365 -- directly or indirectly contains an instance of Outer or of one of its
366 -- parents, in the case of a subunit. Each generic unit holds a list of
367 -- the entities instantiated within (at any depth). This procedure
368 -- determines whether the set of such lists contains a cycle, i.e. an
369 -- illegal circular instantiation.
371 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. Used in
374 -- Restore_Private_Views, to keep the formals of such a package visible
375 -- on exit from an inner instantiation.
377 function Find_Actual_Type
379 Gen_Scope : Entity_Id)
381 -- When validating the actual types of a child instance, check whether
382 -- the formal is a formal type of the parent unit, and retrieve the current
383 -- actual for it. Typ is the entity in the analyzed formal type declaration
384 -- (component or index type of an array type) and Gen_Scope is the scope of
385 -- the analyzed formal array type.
387 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
388 -- Given the entity of a unit that is an instantiation, retrieve the
389 -- original instance node. This is used when loading the instantiations
390 -- of the ancestors of a child generic that is being instantiated.
392 function In_Same_Declarative_Part
396 -- True if the instantiation Inst and the given freeze_node F_Node appear
397 -- within the same declarative part, ignoring subunits, but with no inter-
398 -- vening suprograms or concurrent units. If true, the freeze node
399 -- of the instance can be placed after the freeze node of the parent,
400 -- which it itself an instance.
402 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
403 -- Associate analyzed generic parameter with corresponding
404 -- instance. Used for semantic checks at instantiation time.
406 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
407 -- Traverse the Exchanged_Views list to see if a type was private
408 -- and has already been flipped during this phase of instantiation.
410 procedure Hide_Current_Scope;
411 -- When compiling a generic child unit, the parent context must be
412 -- present, but the instance and all entities that may be generated
413 -- must be inserted in the current scope. We leave the current scope
414 -- on the stack, but make its entities invisible to avoid visibility
415 -- problems. This is reversed at the end of instantiations. This is
416 -- not done for the instantiation of the bodies, which only require the
417 -- instances of the generic parents to be in scope.
419 procedure Install_Body
424 -- If the instantiation happens textually before the body of the generic,
425 -- the instantiation of the body must be analyzed after the generic body,
426 -- and not at the point of instantiation. Such early instantiations can
427 -- happen if the generic and the instance appear in a package declaration
428 -- because the generic body can only appear in the corresponding package
429 -- body. Early instantiations can also appear if generic, instance and
430 -- body are all in the declarative part of a subprogram or entry. Entities
431 -- of packages that are early instantiations are delayed, and their freeze
432 -- node appears after the generic body.
434 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
435 -- Insert freeze node at the end of the declarative part that includes the
436 -- instance node N. If N is in the visible part of an enclosing package
437 -- declaration, the freeze node has to be inserted at the end of the
438 -- private declarations, if any.
440 procedure Freeze_Subprogram_Body
441 (Inst_Node : Node_Id;
443 Pack_Id : Entity_Id);
444 -- The generic body may appear textually after the instance, including
445 -- in the proper body of a stub, or within a different package instance.
446 -- Given that the instance can only be elaborated after the generic, we
447 -- place freeze_nodes for the instance and/or for packages that may enclose
448 -- the instance and the generic, so that the back-end can establish the
449 -- proper order of elaboration.
451 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
452 -- When compiling an instance of a child unit the parent (which is
453 -- itself an instance) is an enclosing scope that must be made
454 -- immediately visible. This procedure is also used to install the non-
455 -- generic parent of a generic child unit when compiling its body, so that
456 -- full views of types in the parent are made visible.
458 procedure Remove_Parent (In_Body : Boolean := False);
459 -- Reverse effect after instantiation of child is complete.
461 procedure Inline_Instance_Body
463 Gen_Unit : Entity_Id;
465 -- If front-end inlining is requested, instantiate the package body,
466 -- and preserve the visibility of its compilation unit, to insure
467 -- that successive instantiations succeed.
469 -- The functions Instantiate_XXX perform various legality checks and build
470 -- the declarations for instantiated generic parameters.
471 -- Need to describe what the parameters are ???
473 function Instantiate_Object
476 Analyzed_Formal : Node_Id)
479 function Instantiate_Type
482 Analyzed_Formal : Node_Id)
485 function Instantiate_Formal_Subprogram
488 Analyzed_Formal : Node_Id)
491 function Instantiate_Formal_Package
494 Analyzed_Formal : Node_Id)
496 -- If the formal package is declared with a box, special visibility rules
497 -- apply to its formals: they are in the visible part of the package. This
498 -- is true in the declarative region of the formal package, that is to say
499 -- in the enclosing generic or instantiation. For an instantiation, the
500 -- parameters of the formal package are made visible in an explicit step.
501 -- Furthermore, if the actual is a visible use_clause, these formals must
502 -- be made potentially use_visible as well. On exit from the enclosing
503 -- instantiation, the reverse must be done.
505 -- For a formal package declared without a box, there are conformance rules
506 -- that apply to the actuals in the generic declaration and the actuals of
507 -- the actual package in the enclosing instantiation. The simplest way to
508 -- apply these rules is to repeat the instantiation of the formal package
509 -- in the context of the enclosing instance, and compare the generic
510 -- associations of this instantiation with those of the actual package.
512 function Is_In_Main_Unit (N : Node_Id) return Boolean;
513 -- Test if given node is in the main unit
515 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
516 -- If the generic appears in a separate non-generic library unit,
517 -- load the corresponding body to retrieve the body of the generic.
518 -- N is the node for the generic instantiation, Spec is the generic
519 -- package declaration.
521 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
522 -- Add the context clause of the unit containing a generic unit to
523 -- an instantiation that is a compilation unit.
525 function Get_Associated_Node (N : Node_Id) return Node_Id;
526 -- In order to propagate semantic information back from the analyzed
527 -- copy to the original generic, we maintain links between selected nodes
528 -- in the generic and their corresponding copies. At the end of generic
529 -- analysis, the routine Save_Global_References traverses the generic
530 -- tree, examines the semantic information, and preserves the links to
531 -- those nodes that contain global information. At instantiation, the
532 -- information from the associated node is placed on the new copy, so
533 -- that name resolution is not repeated.
535 -- Three kinds of source nodes have associated nodes:
537 -- a) those that contain entities, that is to say identifiers,
538 -- expanded_names, and operators (N_Has_Entity)
540 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
542 -- c) selected components (N_Selected_Component)
544 -- For the first class, the associated node preserves the entity if it is
545 -- global. If the generic contains nested instantiations, the associated_
546 -- node itself has been recopied, and a chain of them must be followed.
548 -- For aggregates, the associated node allows retrieval of the type, which
549 -- may otherwise not appear in the generic. The view of this type may be
550 -- different between generic and instantiation, and the full view can be
551 -- installed before the instantiation is analyzed. For aggregates of
552 -- type extensions, the same view exchange may have to be performed for
553 -- some of the ancestor types, if their view is private at the point of
556 -- Nodes that are selected components in the parse tree may be rewritten
557 -- as expanded names after resolution, and must be treated as potential
558 -- entity holders. which is why they also have an Associated_Node.
560 -- Nodes that do not come from source, such as freeze nodes, do not appear
561 -- in the generic tree, and need not have an associated node.
563 -- The associated node is stored in the Associated_Node field. Note that
564 -- this field overlaps Entity, which is fine, because the whole point is
565 -- that we don't need or want the normal Entity field in this situation.
567 procedure Move_Freeze_Nodes
571 -- Freeze nodes can be generated in the analysis of a generic unit, but
572 -- will not be seen by the back-end. It is necessary to move those nodes
573 -- to the enclosing scope if they freeze an outer entity. We place them
574 -- at the end of the enclosing generic package, which is semantically
577 procedure Pre_Analyze_Actuals (N : Node_Id);
578 -- Analyze actuals to perform name resolution. Full resolution is done
579 -- later, when the expected types are known, but names have to be captured
580 -- before installing parents of generics, that are not visible for the
581 -- actuals themselves.
583 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
584 -- Verify that an attribute that appears as the default for a formal
585 -- subprogram is a function or procedure with the correct profile.
587 -------------------------------------------
588 -- Data Structures for Generic Renamings --
589 -------------------------------------------
591 -- The map Generic_Renamings associates generic entities with their
592 -- corresponding actuals. Currently used to validate type instances.
593 -- It will eventually be used for all generic parameters to eliminate
594 -- the need for overload resolution in the instance.
596 type Assoc_Ptr is new Int;
598 Assoc_Null : constant Assoc_Ptr := -1;
603 Next_In_HTable : Assoc_Ptr;
606 package Generic_Renamings is new Table.Table
607 (Table_Component_Type => Assoc,
608 Table_Index_Type => Assoc_Ptr,
609 Table_Low_Bound => 0,
611 Table_Increment => 100,
612 Table_Name => "Generic_Renamings");
614 -- Variable to hold enclosing instantiation. When the environment is
615 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
617 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
619 -- Hash table for associations
621 HTable_Size : constant := 37;
622 type HTable_Range is range 0 .. HTable_Size - 1;
624 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
625 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
626 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
627 function Hash (F : Entity_Id) return HTable_Range;
629 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
630 Header_Num => HTable_Range,
632 Elmt_Ptr => Assoc_Ptr,
633 Null_Ptr => Assoc_Null,
634 Set_Next => Set_Next_Assoc,
637 Get_Key => Get_Gen_Id,
641 Exchanged_Views : Elist_Id;
642 -- This list holds the private views that have been exchanged during
643 -- instantiation to restore the visibility of the generic declaration.
644 -- (see comments above). After instantiation, the current visibility is
645 -- reestablished by means of a traversal of this list.
647 Hidden_Entities : Elist_Id;
648 -- This list holds the entities of the current scope that are removed
649 -- from immediate visibility when instantiating a child unit. Their
650 -- visibility is restored in Remove_Parent.
652 -- Because instantiations can be recursive, the following must be saved
653 -- on entry and restored on exit from an instantiation (spec or body).
654 -- This is done by the two procedures Save_Env and Restore_Env.
656 type Instance_Env is record
658 Instantiated_Parent : Assoc;
659 Exchanged_Views : Elist_Id;
660 Hidden_Entities : Elist_Id;
661 Current_Sem_Unit : Unit_Number_Type;
664 package Instance_Envs is new Table.Table (
665 Table_Component_Type => Instance_Env,
666 Table_Index_Type => Int,
667 Table_Low_Bound => 0,
669 Table_Increment => 100,
670 Table_Name => "Instance_Envs");
672 procedure Restore_Private_Views
673 (Pack_Id : Entity_Id;
674 Is_Package : Boolean := True);
675 -- Restore the private views of external types, and unmark the generic
676 -- renamings of actuals, so that they become comptible subtypes again.
677 -- For subprograms, Pack_Id is the package constructed to hold the
680 procedure Switch_View (T : Entity_Id);
681 -- Switch the partial and full views of a type and its private
682 -- dependents (i.e. its subtypes and derived types).
684 ------------------------------------
685 -- Structures for Error Reporting --
686 ------------------------------------
688 Instantiation_Node : Node_Id;
689 -- Used by subprograms that validate instantiation of formal parameters
690 -- where there might be no actual on which to place the error message.
691 -- Also used to locate the instantiation node for generic subunits.
693 Instantiation_Error : exception;
694 -- When there is a semantic error in the generic parameter matching,
695 -- there is no point in continuing the instantiation, because the
696 -- number of cascaded errors is unpredictable. This exception aborts
697 -- the instantiation process altogether.
699 S_Adjustment : Sloc_Adjustment;
700 -- Offset created for each node in an instantiation, in order to keep
701 -- track of the source position of the instantiation in each of its nodes.
702 -- A subsequent semantic error or warning on a construct of the instance
703 -- points to both places: the original generic node, and the point of
704 -- instantiation. See Sinput and Sinput.L for additional details.
706 ------------------------------------------------------------
707 -- Data structure for keeping track when inside a Generic --
708 ------------------------------------------------------------
710 -- The following table is used to save values of the Inside_A_Generic
711 -- flag (see spec of Sem) when they are saved by Start_Generic.
713 package Generic_Flags is new Table.Table (
714 Table_Component_Type => Boolean,
715 Table_Index_Type => Int,
716 Table_Low_Bound => 0,
718 Table_Increment => 200,
719 Table_Name => "Generic_Flags");
721 ---------------------------
722 -- Abandon_Instantiation --
723 ---------------------------
725 procedure Abandon_Instantiation (N : Node_Id) is
727 Error_Msg_N ("instantiation abandoned!", N);
728 raise Instantiation_Error;
729 end Abandon_Instantiation;
731 --------------------------
732 -- Analyze_Associations --
733 --------------------------
735 function Analyze_Associations
741 Actuals : List_Id := Generic_Associations (I_Node);
743 Actual_Types : Elist_Id := New_Elmt_List;
744 Assoc : List_Id := New_List;
746 Next_Formal : Node_Id;
747 Temp_Formal : Node_Id;
748 Analyzed_Formal : Node_Id;
749 Defaults : Elist_Id := New_Elmt_List;
752 First_Named : Node_Id := Empty;
753 Found_Assoc : Node_Id;
754 Is_Named_Assoc : Boolean;
755 Num_Matched : Int := 0;
756 Num_Actuals : Int := 0;
758 function Matching_Actual
762 -- Find actual that corresponds to a given a formal parameter. If the
763 -- actuals are positional, return the next one, if any. If the actuals
764 -- are named, scan the parameter associations to find the right one.
765 -- A_F is the corresponding entity in the analyzed generic,which is
766 -- placed on the selector name for ASIS use.
768 procedure Set_Analyzed_Formal;
769 -- Find the node in the generic copy that corresponds to a given formal.
770 -- The semantic information on this node is used to perform legality
771 -- checks on the actuals. Because semantic analysis can introduce some
772 -- anonymous entities or modify the declaration node itself, the
773 -- correspondence between the two lists is not one-one. In addition to
774 -- anonymous types, the presence a formal equality will introduce an
775 -- implicit declaration for the corresponding inequality.
777 ---------------------
778 -- Matching_Actual --
779 ---------------------
781 function Matching_Actual
790 Is_Named_Assoc := False;
792 -- End of list of purely positional parameters
797 -- Case of positional parameter corresponding to current formal
799 elsif No (Selector_Name (Actual)) then
800 Found := Explicit_Generic_Actual_Parameter (Actual);
801 Found_Assoc := Actual;
802 Num_Matched := Num_Matched + 1;
805 -- Otherwise scan list of named actuals to find the one with the
806 -- desired name. All remaining actuals have explicit names.
809 Is_Named_Assoc := True;
813 while Present (Actual) loop
814 if Chars (Selector_Name (Actual)) = Chars (F) then
815 Found := Explicit_Generic_Actual_Parameter (Actual);
816 Set_Entity (Selector_Name (Actual), A_F);
817 Set_Etype (Selector_Name (Actual), Etype (A_F));
818 Found_Assoc := Actual;
819 Num_Matched := Num_Matched + 1;
827 -- Reset for subsequent searches. In most cases the named
828 -- associations are in order. If they are not, we reorder them
829 -- to avoid scanning twice the same actual. This is not just a
830 -- question of efficiency: there may be multiple defaults with
831 -- boxes that have the same name. In a nested instantiation we
832 -- insert actuals for those defaults, and cannot rely on their
833 -- names to disambiguate them.
835 if Actual = First_Named then
838 elsif Present (Actual) then
839 Insert_Before (First_Named, Remove_Next (Prev));
842 Actual := First_Named;
848 -------------------------
849 -- Set_Analyzed_Formal --
850 -------------------------
852 procedure Set_Analyzed_Formal is
855 while Present (Analyzed_Formal) loop
856 Kind := Nkind (Analyzed_Formal);
858 case Nkind (Formal) is
860 when N_Formal_Subprogram_Declaration =>
861 exit when Kind = N_Formal_Subprogram_Declaration
864 (Defining_Unit_Name (Specification (Formal))) =
866 (Defining_Unit_Name (Specification (Analyzed_Formal)));
868 when N_Formal_Package_Declaration =>
870 Kind = N_Formal_Package_Declaration
872 Kind = N_Generic_Package_Declaration;
874 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
878 -- Skip freeze nodes, and nodes inserted to replace
879 -- unrecognized pragmas.
882 Kind /= N_Formal_Subprogram_Declaration
883 and then Kind /= N_Subprogram_Declaration
884 and then Kind /= N_Freeze_Entity
885 and then Kind /= N_Null_Statement
886 and then Kind /= N_Itype_Reference
887 and then Chars (Defining_Identifier (Formal)) =
888 Chars (Defining_Identifier (Analyzed_Formal));
891 Next (Analyzed_Formal);
894 end Set_Analyzed_Formal;
896 -- Start of processing for Analyze_Associations
899 -- If named associations are present, save the first named association
900 -- (it may of course be Empty) to facilitate subsequent name search.
902 if Present (Actuals) then
903 First_Named := First (Actuals);
905 while Present (First_Named)
906 and then No (Selector_Name (First_Named))
908 Num_Actuals := Num_Actuals + 1;
913 Named := First_Named;
914 while Present (Named) loop
915 if No (Selector_Name (Named)) then
916 Error_Msg_N ("invalid positional actual after named one", Named);
917 Abandon_Instantiation (Named);
920 Num_Actuals := Num_Actuals + 1;
924 if Present (Formals) then
925 Formal := First_Non_Pragma (Formals);
926 Analyzed_Formal := First_Non_Pragma (F_Copy);
928 if Present (Actuals) then
929 Actual := First (Actuals);
931 -- All formals should have default values
937 while Present (Formal) loop
939 Next_Formal := Next_Non_Pragma (Formal);
941 case Nkind (Formal) is
942 when N_Formal_Object_Declaration =>
945 Defining_Identifier (Formal),
946 Defining_Identifier (Analyzed_Formal));
949 (Instantiate_Object (Formal, Match, Analyzed_Formal),
952 when N_Formal_Type_Declaration =>
955 Defining_Identifier (Formal),
956 Defining_Identifier (Analyzed_Formal));
959 Error_Msg_NE ("missing actual for instantiation of &",
960 Instantiation_Node, Defining_Identifier (Formal));
961 Abandon_Instantiation (Instantiation_Node);
966 Instantiate_Type (Formal, Match, Analyzed_Formal));
968 -- an instantiation is a freeze point for the actuals,
969 -- unless this is a rewritten formal package.
971 if Nkind (I_Node) /= N_Formal_Package_Declaration then
972 Append_Elmt (Entity (Match), Actual_Types);
976 -- A remote access-to-class-wide type must not be an
977 -- actual parameter for a generic formal of an access
978 -- type (E.2.2 (17)).
980 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
982 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
983 N_Access_To_Object_Definition
985 Validate_Remote_Access_To_Class_Wide_Type (Match);
988 when N_Formal_Subprogram_Declaration =>
991 Defining_Unit_Name (Specification (Formal)),
992 Defining_Unit_Name (Specification (Analyzed_Formal)));
994 -- If the formal subprogram has the same name as
995 -- another formal subprogram of the generic, then
996 -- a named association is illegal (12.3(9)). Exclude
997 -- named associations that are generated for a nested
1001 and then Is_Named_Assoc
1002 and then Comes_From_Source (Found_Assoc)
1004 Temp_Formal := First (Formals);
1005 while Present (Temp_Formal) loop
1006 if Nkind (Temp_Formal) =
1007 N_Formal_Subprogram_Declaration
1008 and then Temp_Formal /= Formal
1010 Chars (Selector_Name (Found_Assoc)) =
1011 Chars (Defining_Unit_Name
1012 (Specification (Temp_Formal)))
1015 ("name not allowed for overloaded formal",
1017 Abandon_Instantiation (Instantiation_Node);
1025 Instantiate_Formal_Subprogram
1026 (Formal, Match, Analyzed_Formal));
1029 and then Box_Present (Formal)
1032 (Defining_Unit_Name (Specification (Last (Assoc))),
1036 when N_Formal_Package_Declaration =>
1039 Defining_Identifier (Formal),
1040 Defining_Identifier (Original_Node (Analyzed_Formal)));
1044 ("missing actual for instantiation of&",
1046 Defining_Identifier (Formal));
1048 Abandon_Instantiation (Instantiation_Node);
1053 (Instantiate_Formal_Package
1054 (Formal, Match, Analyzed_Formal),
1058 -- For use type and use package appearing in the context
1059 -- clause, we have already copied them, so we can just
1060 -- move them where they belong (we mustn't recopy them
1061 -- since this would mess up the Sloc values).
1063 when N_Use_Package_Clause |
1064 N_Use_Type_Clause =>
1066 Append (Formal, Assoc);
1069 raise Program_Error;
1073 Formal := Next_Formal;
1074 Next_Non_Pragma (Analyzed_Formal);
1077 if Num_Actuals > Num_Matched then
1079 ("unmatched actuals in instantiation", Instantiation_Node);
1082 elsif Present (Actuals) then
1084 ("too many actuals in generic instantiation", Instantiation_Node);
1088 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1091 while Present (Elmt) loop
1092 Freeze_Before (I_Node, Node (Elmt));
1097 -- If there are default subprograms, normalize the tree by adding
1098 -- explicit associations for them. This is required if the instance
1099 -- appears within a generic.
1107 Elmt := First_Elmt (Defaults);
1108 while Present (Elmt) loop
1109 if No (Actuals) then
1110 Actuals := New_List;
1111 Set_Generic_Associations (I_Node, Actuals);
1114 Subp := Node (Elmt);
1116 Make_Generic_Association (Sloc (Subp),
1117 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1118 Explicit_Generic_Actual_Parameter =>
1119 New_Occurrence_Of (Subp, Sloc (Subp)));
1120 Mark_Rewrite_Insertion (New_D);
1121 Append_To (Actuals, New_D);
1127 end Analyze_Associations;
1129 -------------------------------
1130 -- Analyze_Formal_Array_Type --
1131 -------------------------------
1133 procedure Analyze_Formal_Array_Type
1134 (T : in out Entity_Id;
1140 -- Treated like a non-generic array declaration, with
1141 -- additional semantic checks.
1145 if Nkind (Def) = N_Constrained_Array_Definition then
1146 DSS := First (Discrete_Subtype_Definitions (Def));
1147 while Present (DSS) loop
1148 if Nkind (DSS) = N_Subtype_Indication
1149 or else Nkind (DSS) = N_Range
1150 or else Nkind (DSS) = N_Attribute_Reference
1152 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1159 Array_Type_Declaration (T, Def);
1160 Set_Is_Generic_Type (Base_Type (T));
1162 if Ekind (Component_Type (T)) = E_Incomplete_Type
1163 and then No (Full_View (Component_Type (T)))
1165 Error_Msg_N ("premature usage of incomplete type", Def);
1167 elsif Is_Internal (Component_Type (T))
1168 and then Nkind (Original_Node (Subtype_Indication (Def)))
1169 /= N_Attribute_Reference
1172 ("only a subtype mark is allowed in a formal",
1173 Subtype_Indication (Def));
1176 end Analyze_Formal_Array_Type;
1178 ---------------------------------------------
1179 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1180 ---------------------------------------------
1182 -- As for other generic types, we create a valid type representation
1183 -- with legal but arbitrary attributes, whose values are never considered
1184 -- static. For all scalar types we introduce an anonymous base type, with
1185 -- the same attributes. We choose the corresponding integer type to be
1186 -- Standard_Integer.
1188 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1192 Loc : constant Source_Ptr := Sloc (Def);
1193 Base : constant Entity_Id :=
1195 (E_Decimal_Fixed_Point_Type,
1196 Current_Scope, Sloc (Def), 'G');
1197 Int_Base : constant Entity_Id := Standard_Integer;
1198 Delta_Val : constant Ureal := Ureal_1;
1199 Digs_Val : constant Uint := Uint_6;
1204 Set_Etype (Base, Base);
1205 Set_Size_Info (Base, Int_Base);
1206 Set_RM_Size (Base, RM_Size (Int_Base));
1207 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1208 Set_Digits_Value (Base, Digs_Val);
1209 Set_Delta_Value (Base, Delta_Val);
1210 Set_Small_Value (Base, Delta_Val);
1211 Set_Scalar_Range (Base,
1213 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1214 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1216 Set_Is_Generic_Type (Base);
1217 Set_Parent (Base, Parent (Def));
1219 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1220 Set_Etype (T, Base);
1221 Set_Size_Info (T, Int_Base);
1222 Set_RM_Size (T, RM_Size (Int_Base));
1223 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1224 Set_Digits_Value (T, Digs_Val);
1225 Set_Delta_Value (T, Delta_Val);
1226 Set_Small_Value (T, Delta_Val);
1227 Set_Scalar_Range (T, Scalar_Range (Base));
1229 end Analyze_Formal_Decimal_Fixed_Point_Type;
1231 ---------------------------------
1232 -- Analyze_Formal_Derived_Type --
1233 ---------------------------------
1235 procedure Analyze_Formal_Derived_Type
1240 Loc : constant Source_Ptr := Sloc (Def);
1242 Unk_Disc : Boolean := Unknown_Discriminants_Present (N);
1245 Set_Is_Generic_Type (T);
1247 if Private_Present (Def) then
1249 Make_Private_Extension_Declaration (Loc,
1250 Defining_Identifier => T,
1251 Discriminant_Specifications => Discriminant_Specifications (N),
1252 Unknown_Discriminants_Present => Unk_Disc,
1253 Subtype_Indication => Subtype_Mark (Def));
1255 Set_Abstract_Present (New_N, Abstract_Present (Def));
1259 Make_Full_Type_Declaration (Loc,
1260 Defining_Identifier => T,
1261 Discriminant_Specifications =>
1262 Discriminant_Specifications (Parent (T)),
1264 Make_Derived_Type_Definition (Loc,
1265 Subtype_Indication => Subtype_Mark (Def)));
1267 Set_Abstract_Present
1268 (Type_Definition (New_N), Abstract_Present (Def));
1275 if not Is_Composite_Type (T) then
1277 ("unknown discriminants not allowed for elementary types", N);
1279 Set_Has_Unknown_Discriminants (T);
1280 Set_Is_Constrained (T, False);
1284 -- If the parent type has a known size, so does the formal, which
1285 -- makes legal representation clauses that involve the formal.
1287 Set_Size_Known_At_Compile_Time
1288 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1290 end Analyze_Formal_Derived_Type;
1292 ----------------------------------
1293 -- Analyze_Formal_Discrete_Type --
1294 ----------------------------------
1296 -- The operations defined for a discrete types are those of an
1297 -- enumeration type. The size is set to an arbitrary value, for use
1298 -- in analyzing the generic unit.
1300 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1301 Loc : constant Source_Ptr := Sloc (Def);
1307 Set_Ekind (T, E_Enumeration_Type);
1312 -- For semantic analysis, the bounds of the type must be set to some
1313 -- non-static value. The simplest is to create attribute nodes for
1314 -- those bounds, that refer to the type itself. These bounds are never
1315 -- analyzed but serve as place-holders.
1318 Make_Attribute_Reference (Loc,
1319 Attribute_Name => Name_First,
1320 Prefix => New_Reference_To (T, Loc));
1324 Make_Attribute_Reference (Loc,
1325 Attribute_Name => Name_Last,
1326 Prefix => New_Reference_To (T, Loc));
1329 Set_Scalar_Range (T,
1334 end Analyze_Formal_Discrete_Type;
1336 ----------------------------------
1337 -- Analyze_Formal_Floating_Type --
1338 ---------------------------------
1340 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1341 Base : constant Entity_Id :=
1343 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1346 -- The various semantic attributes are taken from the predefined type
1347 -- Float, just so that all of them are initialized. Their values are
1348 -- never used because no constant folding or expansion takes place in
1349 -- the generic itself.
1352 Set_Ekind (T, E_Floating_Point_Subtype);
1353 Set_Etype (T, Base);
1354 Set_Size_Info (T, (Standard_Float));
1355 Set_RM_Size (T, RM_Size (Standard_Float));
1356 Set_Digits_Value (T, Digits_Value (Standard_Float));
1357 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1359 Set_Is_Generic_Type (Base);
1360 Set_Etype (Base, Base);
1361 Set_Size_Info (Base, (Standard_Float));
1362 Set_RM_Size (Base, RM_Size (Standard_Float));
1363 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1364 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1365 Set_Parent (Base, Parent (Def));
1366 end Analyze_Formal_Floating_Type;
1368 ---------------------------------
1369 -- Analyze_Formal_Modular_Type --
1370 ---------------------------------
1372 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1374 -- Apart from their entity kind, generic modular types are treated
1375 -- like signed integer types, and have the same attributes.
1377 Analyze_Formal_Signed_Integer_Type (T, Def);
1378 Set_Ekind (T, E_Modular_Integer_Subtype);
1379 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1381 end Analyze_Formal_Modular_Type;
1383 ---------------------------------------
1384 -- Analyze_Formal_Object_Declaration --
1385 ---------------------------------------
1387 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1388 E : constant Node_Id := Expression (N);
1389 Id : Node_Id := Defining_Identifier (N);
1396 -- Determine the mode of the formal object
1398 if Out_Present (N) then
1399 K := E_Generic_In_Out_Parameter;
1401 if not In_Present (N) then
1402 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1406 K := E_Generic_In_Parameter;
1409 Find_Type (Subtype_Mark (N));
1410 T := Entity (Subtype_Mark (N));
1412 if Ekind (T) = E_Incomplete_Type then
1413 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1416 if K = E_Generic_In_Parameter then
1417 if Is_Limited_Type (T) then
1419 ("generic formal of mode IN must not be of limited type", N);
1422 if Is_Abstract (T) then
1424 ("generic formal of mode IN must not be of abstract type", N);
1428 Analyze_Default_Expression (E, T);
1434 -- Case of generic IN OUT parameter.
1437 -- If the formal has an unconstrained type, construct its
1438 -- actual subtype, as is done for subprogram formals. In this
1439 -- fashion, all its uses can refer to specific bounds.
1444 if (Is_Array_Type (T)
1445 and then not Is_Constrained (T))
1447 (Ekind (T) = E_Record_Type
1448 and then Has_Discriminants (T))
1451 Non_Freezing_Ref : constant Node_Id :=
1452 New_Reference_To (Id, Sloc (Id));
1456 -- Make sure that the actual subtype doesn't generate
1459 Set_Must_Not_Freeze (Non_Freezing_Ref);
1460 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1461 Insert_Before_And_Analyze (N, Decl);
1462 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1465 Set_Actual_Subtype (Id, T);
1470 ("initialization not allowed for `IN OUT` formals", N);
1474 end Analyze_Formal_Object_Declaration;
1476 ----------------------------------------------
1477 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1478 ----------------------------------------------
1480 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1484 Loc : constant Source_Ptr := Sloc (Def);
1485 Base : constant Entity_Id :=
1487 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1489 -- The semantic attributes are set for completeness only, their
1490 -- values will never be used, because all properties of the type
1494 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1495 Set_Etype (T, Base);
1496 Set_Size_Info (T, Standard_Integer);
1497 Set_RM_Size (T, RM_Size (Standard_Integer));
1498 Set_Small_Value (T, Ureal_1);
1499 Set_Delta_Value (T, Ureal_1);
1500 Set_Scalar_Range (T,
1502 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1503 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1505 Set_Is_Generic_Type (Base);
1506 Set_Etype (Base, Base);
1507 Set_Size_Info (Base, Standard_Integer);
1508 Set_RM_Size (Base, RM_Size (Standard_Integer));
1509 Set_Small_Value (Base, Ureal_1);
1510 Set_Delta_Value (Base, Ureal_1);
1511 Set_Scalar_Range (Base, Scalar_Range (T));
1512 Set_Parent (Base, Parent (Def));
1513 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1515 ----------------------------
1516 -- Analyze_Formal_Package --
1517 ----------------------------
1519 procedure Analyze_Formal_Package (N : Node_Id) is
1520 Loc : constant Source_Ptr := Sloc (N);
1521 Formal : Entity_Id := Defining_Identifier (N);
1522 Gen_Id : constant Node_Id := Name (N);
1524 Gen_Unit : Entity_Id;
1526 Parent_Installed : Boolean := False;
1528 Parent_Instance : Entity_Id;
1529 Renaming_In_Par : Entity_Id;
1532 Text_IO_Kludge (Gen_Id);
1534 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1535 Gen_Unit := Entity (Gen_Id);
1537 if Ekind (Gen_Unit) /= E_Generic_Package then
1538 Error_Msg_N ("expect generic package name", Gen_Id);
1541 elsif Gen_Unit = Current_Scope then
1543 ("generic package cannot be used as a formal package of itself",
1548 -- Check for a formal package that is a package renaming.
1550 if Present (Renamed_Object (Gen_Unit)) then
1551 Gen_Unit := Renamed_Object (Gen_Unit);
1554 -- The formal package is treated like a regular instance, but only
1555 -- the specification needs to be instantiated, to make entities visible.
1557 if not Box_Present (N) then
1558 Hidden_Entities := New_Elmt_List;
1559 Analyze_Package_Instantiation (N);
1561 if Parent_Installed then
1566 -- If there are no generic associations, the generic parameters
1567 -- appear as local entities and are instantiated like them. We copy
1568 -- the generic package declaration as if it were an instantiation,
1569 -- and analyze it like a regular package, except that we treat the
1570 -- formals as additional visible components.
1572 Save_Env (Gen_Unit, Formal);
1574 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1576 if In_Extended_Main_Source_Unit (N) then
1577 Set_Is_Instantiated (Gen_Unit);
1578 Generate_Reference (Gen_Unit, N);
1583 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1584 Set_Defining_Unit_Name (Specification (New_N), Formal);
1587 Enter_Name (Formal);
1588 Set_Ekind (Formal, E_Generic_Package);
1589 Set_Etype (Formal, Standard_Void_Type);
1590 Set_Inner_Instances (Formal, New_Elmt_List);
1593 -- Within the formal, the name of the generic package is a renaming
1594 -- of the formal (as for a regular instantiation).
1596 Renaming := Make_Package_Renaming_Declaration (Loc,
1597 Defining_Unit_Name =>
1598 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1599 Name => New_Reference_To (Formal, Loc));
1601 if Present (Visible_Declarations (Specification (N))) then
1602 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1603 elsif Present (Private_Declarations (Specification (N))) then
1604 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1607 if Is_Child_Unit (Gen_Unit)
1608 and then Parent_Installed
1610 -- Similarly, we have to make the name of the formal visible in
1611 -- the parent instance, to resolve properly fully qualified names
1612 -- that may appear in the generic unit. The parent instance has
1613 -- been placed on the scope stack ahead of the current scope.
1615 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1618 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1619 Set_Ekind (Renaming_In_Par, E_Package);
1620 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1621 Set_Scope (Renaming_In_Par, Parent_Instance);
1622 Set_Parent (Renaming_In_Par, Parent (Formal));
1623 Set_Renamed_Object (Renaming_In_Par, Formal);
1624 Append_Entity (Renaming_In_Par, Parent_Instance);
1627 Analyze_Generic_Formal_Part (N);
1628 Analyze (Specification (N));
1629 End_Package_Scope (Formal);
1631 if Parent_Installed then
1637 -- Inside the generic unit, the formal package is a regular
1638 -- package, but no body is needed for it. Note that after
1639 -- instantiation, the defining_unit_name we need is in the
1640 -- new tree and not in the original. (see Package_Instantiation).
1641 -- A generic formal package is an instance, and can be used as
1642 -- an actual for an inner instance. Mark its generic parent.
1644 Set_Ekind (Formal, E_Package);
1645 Set_Generic_Parent (Specification (N), Gen_Unit);
1646 Set_Has_Completion (Formal, True);
1648 end Analyze_Formal_Package;
1650 ---------------------------------
1651 -- Analyze_Formal_Private_Type --
1652 ---------------------------------
1654 procedure Analyze_Formal_Private_Type
1660 New_Private_Type (N, T, Def);
1662 -- Set the size to an arbitrary but legal value.
1664 Set_Size_Info (T, Standard_Integer);
1665 Set_RM_Size (T, RM_Size (Standard_Integer));
1666 end Analyze_Formal_Private_Type;
1668 ----------------------------------------
1669 -- Analyze_Formal_Signed_Integer_Type --
1670 ----------------------------------------
1672 procedure Analyze_Formal_Signed_Integer_Type
1676 Base : constant Entity_Id :=
1678 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1683 Set_Ekind (T, E_Signed_Integer_Subtype);
1684 Set_Etype (T, Base);
1685 Set_Size_Info (T, Standard_Integer);
1686 Set_RM_Size (T, RM_Size (Standard_Integer));
1687 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1689 Set_Is_Generic_Type (Base);
1690 Set_Size_Info (Base, Standard_Integer);
1691 Set_RM_Size (Base, RM_Size (Standard_Integer));
1692 Set_Etype (Base, Base);
1693 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1694 Set_Parent (Base, Parent (Def));
1695 end Analyze_Formal_Signed_Integer_Type;
1697 -------------------------------
1698 -- Analyze_Formal_Subprogram --
1699 -------------------------------
1701 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1702 Spec : constant Node_Id := Specification (N);
1703 Def : constant Node_Id := Default_Name (N);
1704 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1712 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1713 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1717 Analyze_Subprogram_Declaration (N);
1718 Set_Is_Formal_Subprogram (Nam);
1719 Set_Has_Completion (Nam);
1721 -- Default name is resolved at the point of instantiation
1723 if Box_Present (N) then
1726 -- Else default is bound at the point of generic declaration
1728 elsif Present (Def) then
1729 if Nkind (Def) = N_Operator_Symbol then
1730 Find_Direct_Name (Def);
1732 elsif Nkind (Def) /= N_Attribute_Reference then
1736 -- For an attribute reference, analyze the prefix and verify
1737 -- that it has the proper profile for the subprogram.
1739 Analyze (Prefix (Def));
1740 Valid_Default_Attribute (Nam, Def);
1744 -- Default name may be overloaded, in which case the interpretation
1745 -- with the correct profile must be selected, as for a renaming.
1747 if Etype (Def) = Any_Type then
1750 elsif Nkind (Def) = N_Selected_Component then
1751 Subp := Entity (Selector_Name (Def));
1753 if Ekind (Subp) /= E_Entry then
1754 Error_Msg_N ("expect valid subprogram name as default", Def);
1758 elsif Nkind (Def) = N_Indexed_Component then
1760 if Nkind (Prefix (Def)) /= N_Selected_Component then
1761 Error_Msg_N ("expect valid subprogram name as default", Def);
1765 Subp := Entity (Selector_Name (Prefix (Def)));
1767 if Ekind (Subp) /= E_Entry_Family then
1768 Error_Msg_N ("expect valid subprogram name as default", Def);
1773 elsif Nkind (Def) = N_Character_Literal then
1775 -- Needs some type checks: subprogram should be parameterless???
1777 Resolve (Def, (Etype (Nam)));
1779 elsif (not Is_Entity_Name (Def)
1780 or else not Is_Overloadable (Entity (Def)))
1782 Error_Msg_N ("expect valid subprogram name as default", Def);
1785 elsif not Is_Overloaded (Def) then
1786 Subp := Entity (Def);
1789 Error_Msg_N ("premature usage of formal subprogram", Def);
1791 elsif not Entity_Matches_Spec (Subp, Nam) then
1792 Error_Msg_N ("no visible entity matches specification", Def);
1798 I1 : Interp_Index := 0;
1804 Get_First_Interp (Def, I, It);
1805 while Present (It.Nam) loop
1807 if Entity_Matches_Spec (It.Nam, Nam) then
1808 if Subp /= Any_Id then
1809 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1811 if It1 = No_Interp then
1812 Error_Msg_N ("ambiguous default subprogram", Def);
1825 Get_Next_Interp (I, It);
1829 if Subp /= Any_Id then
1830 Set_Entity (Def, Subp);
1833 Error_Msg_N ("premature usage of formal subprogram", Def);
1835 elsif Ekind (Subp) /= E_Operator then
1836 Check_Mode_Conformant (Subp, Nam);
1840 Error_Msg_N ("no visible subprogram matches specification", N);
1844 end Analyze_Formal_Subprogram;
1846 -------------------------------------
1847 -- Analyze_Formal_Type_Declaration --
1848 -------------------------------------
1850 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1851 Def : constant Node_Id := Formal_Type_Definition (N);
1855 T := Defining_Identifier (N);
1857 if Present (Discriminant_Specifications (N))
1858 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1861 ("discriminants not allowed for this formal type",
1862 Defining_Identifier (First (Discriminant_Specifications (N))));
1865 -- Enter the new name, and branch to specific routine.
1868 when N_Formal_Private_Type_Definition =>
1869 Analyze_Formal_Private_Type (N, T, Def);
1871 when N_Formal_Derived_Type_Definition =>
1872 Analyze_Formal_Derived_Type (N, T, Def);
1874 when N_Formal_Discrete_Type_Definition =>
1875 Analyze_Formal_Discrete_Type (T, Def);
1877 when N_Formal_Signed_Integer_Type_Definition =>
1878 Analyze_Formal_Signed_Integer_Type (T, Def);
1880 when N_Formal_Modular_Type_Definition =>
1881 Analyze_Formal_Modular_Type (T, Def);
1883 when N_Formal_Floating_Point_Definition =>
1884 Analyze_Formal_Floating_Type (T, Def);
1886 when N_Formal_Ordinary_Fixed_Point_Definition =>
1887 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1889 when N_Formal_Decimal_Fixed_Point_Definition =>
1890 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1892 when N_Array_Type_Definition =>
1893 Analyze_Formal_Array_Type (T, Def);
1895 when N_Access_To_Object_Definition |
1896 N_Access_Function_Definition |
1897 N_Access_Procedure_Definition =>
1898 Analyze_Generic_Access_Type (T, Def);
1904 raise Program_Error;
1908 Set_Is_Generic_Type (T);
1909 end Analyze_Formal_Type_Declaration;
1911 ------------------------------------
1912 -- Analyze_Function_Instantiation --
1913 ------------------------------------
1915 procedure Analyze_Function_Instantiation (N : Node_Id) is
1917 Analyze_Subprogram_Instantiation (N, E_Function);
1918 end Analyze_Function_Instantiation;
1920 ---------------------------------
1921 -- Analyze_Generic_Access_Type --
1922 ---------------------------------
1924 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1928 if Nkind (Def) = N_Access_To_Object_Definition then
1929 Access_Type_Declaration (T, Def);
1931 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1932 and then No (Full_View (Designated_Type (T)))
1933 and then not Is_Generic_Type (Designated_Type (T))
1935 Error_Msg_N ("premature usage of incomplete type", Def);
1937 elsif Is_Internal (Designated_Type (T)) then
1939 ("only a subtype mark is allowed in a formal", Def);
1943 Access_Subprogram_Declaration (T, Def);
1945 end Analyze_Generic_Access_Type;
1947 ---------------------------------
1948 -- Analyze_Generic_Formal_Part --
1949 ---------------------------------
1951 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
1952 Gen_Parm_Decl : Node_Id;
1955 -- The generic formals are processed in the scope of the generic
1956 -- unit, where they are immediately visible. The scope is installed
1959 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
1961 while Present (Gen_Parm_Decl) loop
1962 Analyze (Gen_Parm_Decl);
1963 Next (Gen_Parm_Decl);
1965 end Analyze_Generic_Formal_Part;
1967 ------------------------------------------
1968 -- Analyze_Generic_Package_Declaration --
1969 ------------------------------------------
1971 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
1974 Save_Parent : Node_Id;
1977 -- Create copy of generic unit, and save for instantiation.
1978 -- If the unit is a child unit, do not copy the specifications
1979 -- for the parent, which are not part of the generic tree.
1981 Save_Parent := Parent_Spec (N);
1982 Set_Parent_Spec (N, Empty);
1984 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
1985 Set_Parent_Spec (New_N, Save_Parent);
1987 Id := Defining_Entity (N);
1988 Generate_Definition (Id);
1990 -- Expansion is not applied to generic units.
1995 Set_Ekind (Id, E_Generic_Package);
1996 Set_Etype (Id, Standard_Void_Type);
1998 Enter_Generic_Scope (Id);
1999 Set_Inner_Instances (Id, New_Elmt_List);
2001 Set_Categorization_From_Pragmas (N);
2002 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2004 -- For a library unit, we have reconstructed the entity for the
2005 -- unit, and must reset it in the library tables.
2007 if Nkind (Parent (N)) = N_Compilation_Unit then
2008 Set_Cunit_Entity (Current_Sem_Unit, Id);
2011 Analyze_Generic_Formal_Part (N);
2013 -- After processing the generic formals, analysis proceeds
2014 -- as for a non-generic package.
2016 Analyze (Specification (N));
2018 Validate_Categorization_Dependency (N, Id);
2022 End_Package_Scope (Id);
2023 Exit_Generic_Scope (Id);
2025 if Nkind (Parent (N)) /= N_Compilation_Unit then
2026 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2027 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2028 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2031 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2032 Validate_RT_RAT_Component (N);
2035 end Analyze_Generic_Package_Declaration;
2037 --------------------------------------------
2038 -- Analyze_Generic_Subprogram_Declaration --
2039 --------------------------------------------
2041 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2046 Save_Parent : Node_Id;
2049 -- Create copy of generic unit,and save for instantiation.
2050 -- If the unit is a child unit, do not copy the specifications
2051 -- for the parent, which are not part of the generic tree.
2053 Save_Parent := Parent_Spec (N);
2054 Set_Parent_Spec (N, Empty);
2056 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2057 Set_Parent_Spec (New_N, Save_Parent);
2060 Spec := Specification (N);
2061 Id := Defining_Entity (Spec);
2062 Generate_Definition (Id);
2064 if Nkind (Id) = N_Defining_Operator_Symbol then
2066 ("operator symbol not allowed for generic subprogram", Id);
2073 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2075 Enter_Generic_Scope (Id);
2076 Set_Inner_Instances (Id, New_Elmt_List);
2077 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2079 Analyze_Generic_Formal_Part (N);
2081 Formals := Parameter_Specifications (Spec);
2083 if Present (Formals) then
2084 Process_Formals (Id, Formals, Spec);
2087 if Nkind (Spec) = N_Function_Specification then
2088 Set_Ekind (Id, E_Generic_Function);
2089 Find_Type (Subtype_Mark (Spec));
2090 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2092 Set_Ekind (Id, E_Generic_Procedure);
2093 Set_Etype (Id, Standard_Void_Type);
2096 -- For a library unit, we have reconstructed the entity for the
2097 -- unit, and must reset it in the library tables. We also need
2098 -- to make sure that Body_Required is set properly in the original
2099 -- compilation unit node.
2101 if Nkind (Parent (N)) = N_Compilation_Unit then
2102 Set_Cunit_Entity (Current_Sem_Unit, Id);
2103 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2106 Set_Categorization_From_Pragmas (N);
2107 Validate_Categorization_Dependency (N, Id);
2109 Save_Global_References (Original_Node (N));
2113 Exit_Generic_Scope (Id);
2115 end Analyze_Generic_Subprogram_Declaration;
2117 -----------------------------------
2118 -- Analyze_Package_Instantiation --
2119 -----------------------------------
2121 -- Note: this procedure is also used for formal package declarations,
2122 -- in which case the argument N is an N_Formal_Package_Declaration
2123 -- node. This should really be noted in the spec! ???
2125 procedure Analyze_Package_Instantiation (N : Node_Id) is
2126 Loc : constant Source_Ptr := Sloc (N);
2127 Gen_Id : constant Node_Id := Name (N);
2130 Act_Decl_Name : Node_Id;
2131 Act_Decl_Id : Entity_Id;
2136 Gen_Unit : Entity_Id;
2138 Is_Actual_Pack : Boolean := Is_Internal (Defining_Entity (N));
2139 Parent_Installed : Boolean := False;
2140 Renaming_List : List_Id;
2141 Unit_Renaming : Node_Id;
2142 Needs_Body : Boolean;
2143 Inline_Now : Boolean := False;
2145 procedure Delay_Descriptors (E : Entity_Id);
2146 -- Delay generation of subprogram descriptors for given entity
2148 function Might_Inline_Subp return Boolean;
2149 -- If inlining is active and the generic contains inlined subprograms,
2150 -- we instantiate the body. This may cause superfluous instantiations,
2151 -- but it is simpler than detecting the need for the body at the point
2152 -- of inlining, when the context of the instance is not available.
2154 -----------------------
2155 -- Delay_Descriptors --
2156 -----------------------
2158 procedure Delay_Descriptors (E : Entity_Id) is
2160 if not Delay_Subprogram_Descriptors (E) then
2161 Set_Delay_Subprogram_Descriptors (E);
2162 Pending_Descriptor.Increment_Last;
2163 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2165 end Delay_Descriptors;
2167 -----------------------
2168 -- Might_Inline_Subp --
2169 -----------------------
2171 function Might_Inline_Subp return Boolean is
2175 if not Inline_Processing_Required then
2179 E := First_Entity (Gen_Unit);
2181 while Present (E) loop
2183 if Is_Subprogram (E)
2184 and then Is_Inlined (E)
2194 end Might_Inline_Subp;
2196 -- Start of processing for Analyze_Package_Instantiation
2199 -- Very first thing: apply the special kludge for Text_IO processing
2200 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2202 Text_IO_Kludge (Name (N));
2204 -- Make node global for error reporting.
2206 Instantiation_Node := N;
2208 -- Case of instantiation of a generic package
2210 if Nkind (N) = N_Package_Instantiation then
2211 Act_Decl_Id := New_Copy (Defining_Entity (N));
2212 Set_Comes_From_Source (Act_Decl_Id, True);
2214 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2216 Make_Defining_Program_Unit_Name (Loc,
2217 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2218 Defining_Identifier => Act_Decl_Id);
2220 Act_Decl_Name := Act_Decl_Id;
2223 -- Case of instantiation of a formal package
2226 Act_Decl_Id := Defining_Identifier (N);
2227 Act_Decl_Name := Act_Decl_Id;
2230 Generate_Definition (Act_Decl_Id);
2231 Pre_Analyze_Actuals (N);
2233 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2234 Gen_Unit := Entity (Gen_Id);
2236 -- Verify that it is the name of a generic package
2238 if Etype (Gen_Unit) = Any_Type then
2241 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2243 ("expect name of generic package in instantiation", Gen_Id);
2247 if In_Extended_Main_Source_Unit (N) then
2248 Set_Is_Instantiated (Gen_Unit);
2249 Generate_Reference (Gen_Unit, N);
2251 if Present (Renamed_Object (Gen_Unit)) then
2252 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2253 Generate_Reference (Renamed_Object (Gen_Unit), N);
2257 if Nkind (Gen_Id) = N_Identifier
2258 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2261 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2263 elsif Nkind (Gen_Id) = N_Expanded_Name
2264 and then Is_Child_Unit (Gen_Unit)
2265 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2266 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2269 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2272 -- If renaming, indicate this is an instantiation of renamed unit.
2274 if Present (Renamed_Object (Gen_Unit))
2275 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2277 Gen_Unit := Renamed_Object (Gen_Unit);
2278 Set_Entity (Gen_Id, Gen_Unit);
2281 -- Verify that there are no circular instantiations.
2283 if In_Open_Scopes (Gen_Unit) then
2284 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2287 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2288 Error_Msg_Node_2 := Current_Scope;
2290 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2291 Circularity_Detected := True;
2295 Save_Env (Gen_Unit, Act_Decl_Id);
2296 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2298 -- Initialize renamings map, for error checking, and the list
2299 -- that holds private entities whose views have changed between
2300 -- generic definition and instantiation. If this is the instance
2301 -- created to validate an actual package, the instantiation
2302 -- environment is that of the enclosing instance.
2304 Generic_Renamings.Set_Last (0);
2305 Generic_Renamings_HTable.Reset;
2307 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2309 -- Copy original generic tree, to produce text for instantiation.
2313 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2315 Act_Spec := Specification (Act_Tree);
2317 -- If this is the instance created to validate an actual package,
2318 -- only the formals matter, do not examine the package spec itself.
2320 if Is_Actual_Pack then
2321 Set_Visible_Declarations (Act_Spec, New_List);
2322 Set_Private_Declarations (Act_Spec, New_List);
2326 Analyze_Associations
2328 Generic_Formal_Declarations (Act_Tree),
2329 Generic_Formal_Declarations (Gen_Decl));
2331 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2332 Set_Is_Generic_Instance (Act_Decl_Id);
2334 Set_Generic_Parent (Act_Spec, Gen_Unit);
2336 -- References to the generic in its own declaration or its body
2337 -- are references to the instance. Add a renaming declaration for
2338 -- the generic unit itself. This declaration, as well as the renaming
2339 -- declarations for the generic formals, must remain private to the
2340 -- unit: the formals, because this is the language semantics, and
2341 -- the unit because its use is an artifact of the implementation.
2344 Make_Package_Renaming_Declaration (Loc,
2345 Defining_Unit_Name =>
2346 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2347 Name => New_Reference_To (Act_Decl_Id, Loc));
2349 Append (Unit_Renaming, Renaming_List);
2351 -- The renaming declarations are the first local declarations of
2354 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2356 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2358 Set_Visible_Declarations (Act_Spec, Renaming_List);
2362 Make_Package_Declaration (Loc,
2363 Specification => Act_Spec);
2365 -- Save the instantiation node, for subsequent instantiation
2366 -- of the body, if there is one and we are generating code for
2367 -- the current unit. Mark the unit as having a body, to avoid
2368 -- a premature error message.
2370 -- We instantiate the body if we are generating code, if we are
2371 -- generating cross-reference information, or if we are building
2372 -- trees for ASIS use.
2375 Enclosing_Body_Present : Boolean := False;
2379 if Scope (Gen_Unit) /= Standard_Standard
2380 and then not Is_Child_Unit (Gen_Unit)
2382 Scop := Scope (Gen_Unit);
2384 while Present (Scop)
2385 and then Scop /= Standard_Standard
2387 if Unit_Requires_Body (Scop) then
2388 Enclosing_Body_Present := True;
2392 Scop := Scope (Scop);
2396 -- If front-end inlining is enabled, and this is a unit for which
2397 -- code will be generated, we instantiate the body at once.
2398 -- This is done if the instance is not the main unit, and if the
2399 -- generic is not a child unit, to avoid scope problems.
2401 if Front_End_Inlining
2402 and then Expander_Active
2403 and then not Is_Child_Unit (Gen_Unit)
2404 and then Is_In_Main_Unit (N)
2405 and then Nkind (Parent (N)) /= N_Compilation_Unit
2406 and then Might_Inline_Subp
2412 (Unit_Requires_Body (Gen_Unit)
2413 or else Enclosing_Body_Present
2414 or else Present (Corresponding_Body (Gen_Decl)))
2415 and then (Is_In_Main_Unit (N)
2416 or else Might_Inline_Subp)
2417 and then not Is_Actual_Pack
2418 and then not Inline_Now
2420 and then (Operating_Mode = Generate_Code
2421 or else (Operating_Mode = Check_Semantics
2422 and then Tree_Output));
2424 -- If front_end_inlining is enabled, do not instantiate a
2425 -- body if within a generic context.
2427 if Front_End_Inlining
2428 and then not Expander_Active
2430 Needs_Body := False;
2435 -- If we are generating the calling stubs from the instantiation
2436 -- of a generic RCI package, we will not use the body of the
2439 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2440 and then Is_Compilation_Unit (Defining_Entity (N))
2442 Needs_Body := False;
2447 -- Here is a defence against a ludicrous number of instantiations
2448 -- caused by a circular set of instantiation attempts.
2450 if Pending_Instantiations.Last >
2451 Hostparm.Max_Instantiations
2453 Error_Msg_N ("too many instantiations", N);
2454 raise Unrecoverable_Error;
2457 -- Indicate that the enclosing scopes contain an instantiation,
2458 -- and that cleanup actions should be delayed until after the
2459 -- instance body is expanded.
2461 Check_Forward_Instantiation (N, Gen_Decl);
2462 if Nkind (N) = N_Package_Instantiation then
2464 Enclosing_Master : Entity_Id := Current_Scope;
2467 while Enclosing_Master /= Standard_Standard loop
2469 if Ekind (Enclosing_Master) = E_Package then
2470 if Is_Compilation_Unit (Enclosing_Master) then
2471 if In_Package_Body (Enclosing_Master) then
2473 (Body_Entity (Enclosing_Master));
2482 Enclosing_Master := Scope (Enclosing_Master);
2485 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2486 Enclosing_Master := Scope (Enclosing_Master);
2488 elsif Ekind (Enclosing_Master) = E_Generic_Function
2489 or else Ekind (Enclosing_Master) = E_Generic_Procedure
2490 or else Ekind (Enclosing_Master) = E_Void
2492 -- Cleanup actions will eventually be performed on
2493 -- the enclosing instance, if any. enclosing scope
2494 -- is void in the formal part of a generic subp.
2499 if Ekind (Enclosing_Master) = E_Entry
2501 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2504 Protected_Body_Subprogram (Enclosing_Master);
2507 Set_Delay_Cleanups (Enclosing_Master);
2509 while Ekind (Enclosing_Master) = E_Block loop
2510 Enclosing_Master := Scope (Enclosing_Master);
2513 if Is_Subprogram (Enclosing_Master) then
2514 Delay_Descriptors (Enclosing_Master);
2516 elsif Is_Task_Type (Enclosing_Master) then
2518 TBP : constant Node_Id :=
2519 Get_Task_Body_Procedure
2523 if Present (TBP) then
2524 Delay_Descriptors (TBP);
2525 Set_Delay_Cleanups (TBP);
2535 -- Make entry in table
2537 Pending_Instantiations.Increment_Last;
2538 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2539 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2543 Set_Categorization_From_Pragmas (Act_Decl);
2545 if Parent_Installed then
2549 Set_Instance_Spec (N, Act_Decl);
2551 -- If not a compilation unit, insert the package declaration
2552 -- after the instantiation node.
2554 if Nkind (Parent (N)) /= N_Compilation_Unit then
2555 Mark_Rewrite_Insertion (Act_Decl);
2556 Insert_Before (N, Act_Decl);
2559 -- For an instantiation that is a compilation unit, place
2560 -- declaration on current node so context is complete
2561 -- for analysis (including nested instantiations). It this
2562 -- is the main unit, the declaration eventually replaces the
2563 -- instantiation node. If the instance body is later created, it
2564 -- replaces the instance node, and the declation is attached to
2565 -- it (see Build_Instance_Compilation_Unit_Nodes).
2568 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2570 -- The entity for the current unit is the newly created one,
2571 -- and all semantic information is attached to it.
2573 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2575 -- If this is the main unit, replace the main entity as well.
2577 if Current_Sem_Unit = Main_Unit then
2578 Main_Unit_Entity := Act_Decl_Id;
2582 Set_Unit (Parent (N), Act_Decl);
2583 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2585 Set_Unit (Parent (N), N);
2586 Set_Body_Required (Parent (N), False);
2588 -- We never need elaboration checks on instantiations, since
2589 -- by definition, the body instantiation is elaborated at the
2590 -- same time as the spec instantiation.
2592 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2593 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2596 Check_Elab_Instantiation (N);
2598 if ABE_Is_Certain (N) and then Needs_Body then
2599 Pending_Instantiations.Decrement_Last;
2601 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2603 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2604 First_Private_Entity (Act_Decl_Id));
2606 if Nkind (Parent (N)) = N_Compilation_Unit
2607 and then not Needs_Body
2609 Rewrite (N, Act_Decl);
2612 if Present (Corresponding_Body (Gen_Decl))
2613 or else Unit_Requires_Body (Gen_Unit)
2615 Set_Has_Completion (Act_Decl_Id);
2618 Check_Formal_Packages (Act_Decl_Id);
2620 Restore_Private_Views (Act_Decl_Id);
2622 if not Generic_Separately_Compiled (Gen_Unit) then
2623 Inherit_Context (Gen_Decl, N);
2626 if Parent_Installed then
2633 Validate_Categorization_Dependency (N, Act_Decl_Id);
2635 -- Check restriction, but skip this if something went wrong in
2636 -- the above analysis, indicated by Act_Decl_Id being void.
2638 if Ekind (Act_Decl_Id) /= E_Void
2639 and then not Is_Library_Level_Entity (Act_Decl_Id)
2641 Check_Restriction (No_Local_Allocators, N);
2645 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2649 when Instantiation_Error =>
2650 if Parent_Installed then
2654 end Analyze_Package_Instantiation;
2656 ---------------------------
2657 -- Inline_Instance_Body --
2658 ---------------------------
2660 procedure Inline_Instance_Body
2662 Gen_Unit : Entity_Id;
2666 Gen_Comp : constant Entity_Id :=
2667 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2668 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2669 Curr_Scope : Entity_Id := Empty;
2670 Curr_Unit : constant Entity_Id :=
2671 Cunit_Entity (Current_Sem_Unit);
2672 Removed : Boolean := False;
2673 Num_Scopes : Int := 0;
2674 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2675 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2676 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2677 Num_Inner : Int := 0;
2678 N_Instances : Int := 0;
2682 -- Case of generic unit defined in another unit
2684 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2685 Vis := Is_Immediately_Visible (Gen_Comp);
2690 and then S /= Standard_Standard
2692 Num_Scopes := Num_Scopes + 1;
2694 Use_Clauses (Num_Scopes) :=
2696 (Scope_Stack.Last - Num_Scopes + 1).
2698 End_Use_Clauses (Use_Clauses (Num_Scopes));
2700 exit when Is_Generic_Instance (S)
2701 and then (In_Package_Body (S)
2702 or else Ekind (S) = E_Procedure
2703 or else Ekind (S) = E_Function);
2707 -- Find and save all enclosing instances
2712 and then S /= Standard_Standard
2714 if Is_Generic_Instance (S) then
2715 N_Instances := N_Instances + 1;
2716 Instances (N_Instances) := S;
2722 -- Remove context of current compilation unit, unless we
2723 -- are within a nested package instantiation, in which case
2724 -- the context has been removed previously.
2726 -- If current scope is the body of a child unit, remove context
2732 and then S /= Standard_Standard
2734 exit when Is_Generic_Instance (S)
2735 and then (In_Package_Body (S)
2736 or else Ekind (S) = E_Procedure
2737 or else Ekind (S) = E_Function);
2740 or else (Ekind (Curr_Unit) = E_Package_Body
2741 and then S = Spec_Entity (Curr_Unit))
2745 -- Remove entities in current scopes from visibility, so
2746 -- than instance body is compiled in a clean environment.
2750 if Is_Child_Unit (S) then
2752 -- Remove child unit from stack, as well as inner scopes.
2753 -- Removing the context of a child unit removes parent
2756 while Current_Scope /= S loop
2757 Num_Inner := Num_Inner + 1;
2758 Inner_Scopes (Num_Inner) := Current_Scope;
2763 Remove_Context (Curr_Comp);
2767 Remove_Context (Curr_Comp);
2770 if Ekind (Curr_Unit) = E_Package_Body then
2771 Remove_Context (Library_Unit (Curr_Comp));
2778 New_Scope (Standard_Standard);
2779 Instantiate_Package_Body
2780 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2785 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2787 -- Reset Generic_Instance flag so that use clauses can be installed
2788 -- in the proper order. (See Use_One_Package for effect of enclosing
2789 -- instances on processing of use clauses).
2791 for J in 1 .. N_Instances loop
2792 Set_Is_Generic_Instance (Instances (J), False);
2796 Install_Context (Curr_Comp);
2798 if Present (Curr_Scope)
2799 and then Is_Child_Unit (Curr_Scope)
2801 New_Scope (Curr_Scope);
2802 Set_Is_Immediately_Visible (Curr_Scope);
2804 -- Finally, restore inner scopes as well.
2806 for J in reverse 1 .. Num_Inner loop
2807 New_Scope (Inner_Scopes (J));
2811 Restore_Scope_Stack;
2814 for J in reverse 1 .. Num_Scopes loop
2815 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
2817 Install_Use_Clauses (Use_Clauses (J));
2820 for J in 1 .. N_Instances loop
2821 Set_Is_Generic_Instance (Instances (J), True);
2824 -- If generic unit is in current unit, current context is correct.
2827 Instantiate_Package_Body
2828 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2830 end Inline_Instance_Body;
2832 -------------------------------------
2833 -- Analyze_Procedure_Instantiation --
2834 -------------------------------------
2836 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
2838 Analyze_Subprogram_Instantiation (N, E_Procedure);
2839 end Analyze_Procedure_Instantiation;
2841 --------------------------------------
2842 -- Analyze_Subprogram_Instantiation --
2843 --------------------------------------
2845 procedure Analyze_Subprogram_Instantiation
2849 Loc : constant Source_Ptr := Sloc (N);
2850 Gen_Id : constant Node_Id := Name (N);
2852 Act_Decl_Id : Entity_Id;
2853 Anon_Id : Entity_Id :=
2854 Make_Defining_Identifier
2855 (Sloc (Defining_Entity (N)),
2857 (Chars (Defining_Entity (N)), 'R'));
2862 Gen_Unit : Entity_Id;
2864 Pack_Id : Entity_Id;
2865 Parent_Installed : Boolean := False;
2866 Renaming_List : List_Id;
2869 procedure Analyze_Instance_And_Renamings;
2870 -- The instance must be analyzed in a context that includes the
2871 -- mappings of generic parameters into actuals. We create a package
2872 -- declaration for this purpose, and a subprogram with an internal
2873 -- name within the package. The subprogram instance is simply an
2874 -- alias for the internal subprogram, declared in the current scope.
2876 ------------------------------------
2877 -- Analyze_Instance_And_Renamings --
2878 ------------------------------------
2880 procedure Analyze_Instance_And_Renamings is
2881 Def_Ent : constant Entity_Id := Defining_Entity (N);
2882 Pack_Decl : Node_Id;
2885 if Nkind (Parent (N)) = N_Compilation_Unit then
2887 -- For the case of a compilation unit, the container package
2888 -- has the same name as the instantiation, to insure that the
2889 -- binder calls the elaboration procedure with the right name.
2890 -- Copy the entity of the instance, which may have compilation
2891 -- level flags (eg. is_child_unit) set.
2893 Pack_Id := New_Copy (Def_Ent);
2896 -- Otherwise we use the name of the instantiation concatenated
2897 -- with its source position to ensure uniqueness if there are
2898 -- several instantiations with the same name.
2901 Make_Defining_Identifier (Loc,
2902 Chars => New_External_Name
2903 (Related_Id => Chars (Def_Ent),
2905 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
2908 Pack_Decl := Make_Package_Declaration (Loc,
2909 Specification => Make_Package_Specification (Loc,
2910 Defining_Unit_Name => Pack_Id,
2911 Visible_Declarations => Renaming_List,
2912 End_Label => Empty));
2914 Set_Instance_Spec (N, Pack_Decl);
2915 Set_Is_Generic_Instance (Pack_Id);
2917 -- Case of not a compilation unit
2919 if Nkind (Parent (N)) /= N_Compilation_Unit then
2920 Mark_Rewrite_Insertion (Pack_Decl);
2921 Insert_Before (N, Pack_Decl);
2922 Set_Has_Completion (Pack_Id);
2924 -- Case of an instantiation that is a compilation unit
2926 -- Place declaration on current node so context is complete
2927 -- for analysis (including nested instantiations), and for
2928 -- use in a context_clause (see Analyze_With_Clause).
2931 Set_Unit (Parent (N), Pack_Decl);
2932 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
2935 Analyze (Pack_Decl);
2936 Check_Formal_Packages (Pack_Id);
2937 Set_Is_Generic_Instance (Pack_Id, False);
2939 -- Body of the enclosing package is supplied when instantiating
2940 -- the subprogram body, after semantic analysis is completed.
2942 if Nkind (Parent (N)) = N_Compilation_Unit then
2944 -- Remove package itself from visibility, so it does not
2945 -- conflict with subprogram.
2947 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
2949 -- Set name and scope of internal subprogram so that the
2950 -- proper external name will be generated. The proper scope
2951 -- is the scope of the wrapper package.
2953 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
2954 Set_Scope (Anon_Id, Scope (Pack_Id));
2957 Set_Is_Generic_Instance (Anon_Id);
2958 Act_Decl_Id := New_Copy (Anon_Id);
2960 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
2961 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
2962 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
2963 Set_Comes_From_Source (Act_Decl_Id, True);
2965 -- The signature may involve types that are not frozen yet, but
2966 -- the subprogram will be frozen at the point the wrapper package
2967 -- is frozen, so it does not need its own freeze node. In fact, if
2968 -- one is created, it might conflict with the freezing actions from
2969 -- the wrapper package (see 7206-013).
2971 Set_Has_Delayed_Freeze (Anon_Id, False);
2973 -- If the instance is a child unit, mark the Id accordingly. Mark
2974 -- the anonymous entity as well, which is the real subprogram and
2975 -- which is used when the instance appears in a context clause.
2977 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
2978 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
2979 New_Overloaded_Entity (Act_Decl_Id);
2980 Check_Eliminated (Act_Decl_Id);
2982 -- In compilation unit case, kill elaboration checks on the
2983 -- instantiation, since they are never needed -- the body is
2984 -- instantiated at the same point as the spec.
2986 if Nkind (Parent (N)) = N_Compilation_Unit then
2987 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2988 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2989 Set_Is_Compilation_Unit (Anon_Id);
2991 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
2994 -- The instance is not a freezing point for the new subprogram.
2996 Set_Is_Frozen (Act_Decl_Id, False);
2998 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
2999 Valid_Operator_Definition (Act_Decl_Id);
3002 Set_Alias (Act_Decl_Id, Anon_Id);
3003 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3004 Set_Has_Completion (Act_Decl_Id);
3005 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3007 if Nkind (Parent (N)) = N_Compilation_Unit then
3008 Set_Body_Required (Parent (N), False);
3011 end Analyze_Instance_And_Renamings;
3013 -- Start of processing for Analyze_Subprogram_Instantiation
3016 -- Very first thing: apply the special kludge for Text_IO processing
3017 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3018 -- Of course such an instantiation is bogus (these are packages, not
3019 -- subprograms), but we get a better error message if we do this.
3021 Text_IO_Kludge (Gen_Id);
3023 -- Make node global for error reporting.
3025 Instantiation_Node := N;
3026 Pre_Analyze_Actuals (N);
3028 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3029 Gen_Unit := Entity (Gen_Id);
3031 Generate_Reference (Gen_Unit, Gen_Id);
3033 if Nkind (Gen_Id) = N_Identifier
3034 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3037 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3040 if Etype (Gen_Unit) = Any_Type then return; end if;
3042 -- Verify that it is a generic subprogram of the right kind, and that
3043 -- it does not lead to a circular instantiation.
3045 if Ekind (Gen_Unit) /= E_Generic_Procedure
3046 and then Ekind (Gen_Unit) /= E_Generic_Function
3048 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3050 elsif In_Open_Scopes (Gen_Unit) then
3051 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3053 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3054 Error_Msg_Node_2 := Current_Scope;
3056 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3057 Circularity_Detected := True;
3059 elsif K = E_Procedure
3060 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3062 if Ekind (Gen_Unit) = E_Generic_Function then
3064 ("cannot instantiate generic function as procedure", Gen_Id);
3067 ("expect name of generic procedure in instantiation", Gen_Id);
3070 elsif K = E_Function
3071 and then Ekind (Gen_Unit) /= E_Generic_Function
3073 if Ekind (Gen_Unit) = E_Generic_Procedure then
3075 ("cannot instantiate generic procedure as function", Gen_Id);
3078 ("expect name of generic function in instantiation", Gen_Id);
3082 -- If renaming, indicate that this is instantiation of renamed unit
3084 if Present (Renamed_Object (Gen_Unit))
3085 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3087 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3089 Gen_Unit := Renamed_Object (Gen_Unit);
3090 Set_Entity (Gen_Id, Gen_Unit);
3093 if In_Extended_Main_Source_Unit (N) then
3094 Set_Is_Instantiated (Gen_Unit);
3095 Generate_Reference (Gen_Unit, N);
3098 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3099 Spec := Specification (Gen_Decl);
3101 -- The subprogram itself cannot contain a nested instance, so
3102 -- the current parent is left empty.
3104 Save_Env (Gen_Unit, Empty);
3106 -- Initialize renamings map, for error checking.
3108 Generic_Renamings.Set_Last (0);
3109 Generic_Renamings_HTable.Reset;
3111 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
3113 -- Copy original generic tree, to produce text for instantiation.
3117 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3119 Act_Spec := Specification (Act_Tree);
3121 Analyze_Associations
3123 Generic_Formal_Declarations (Act_Tree),
3124 Generic_Formal_Declarations (Gen_Decl));
3126 -- Build the subprogram declaration, which does not appear
3127 -- in the generic template, and give it a sloc consistent
3128 -- with that of the template.
3130 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3131 Set_Generic_Parent (Act_Spec, Gen_Unit);
3133 Make_Subprogram_Declaration (Sloc (Act_Spec),
3134 Specification => Act_Spec);
3136 Set_Categorization_From_Pragmas (Act_Decl);
3138 if Parent_Installed then
3142 Append (Act_Decl, Renaming_List);
3143 Analyze_Instance_And_Renamings;
3145 -- If the generic is marked Import (Intrinsic), then so is the
3146 -- instance. This indicates that there is no body to instantiate.
3147 -- If generic is marked inline, so it the instance, and the
3148 -- anonymous subprogram it renames. If inlined, or else if inlining
3149 -- is enabled for the compilation, we generate the instance body
3150 -- even if it is not within the main unit.
3152 -- Any other pragmas might also be inherited ???
3154 if Is_Intrinsic_Subprogram (Gen_Unit) then
3155 Set_Is_Intrinsic_Subprogram (Anon_Id);
3156 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3158 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3159 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3163 Generate_Definition (Act_Decl_Id);
3165 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3166 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3168 Check_Elab_Instantiation (N);
3169 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3171 -- Subject to change, pending on if other pragmas are inherited ???
3173 Validate_Categorization_Dependency (N, Act_Decl_Id);
3175 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3177 if not Generic_Separately_Compiled (Gen_Unit) then
3178 Inherit_Context (Gen_Decl, N);
3181 Restore_Private_Views (Pack_Id, False);
3183 -- If the context requires a full instantiation, mark node for
3184 -- subsequent construction of the body.
3186 if (Is_In_Main_Unit (N)
3187 or else Is_Inlined (Act_Decl_Id))
3188 and then (Operating_Mode = Generate_Code
3189 or else (Operating_Mode = Check_Semantics
3190 and then Tree_Output))
3191 and then (Expander_Active or else Tree_Output)
3192 and then not ABE_Is_Certain (N)
3193 and then not Is_Eliminated (Act_Decl_Id)
3195 Pending_Instantiations.Increment_Last;
3196 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3197 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3198 Check_Forward_Instantiation (N, Gen_Decl);
3200 -- The wrapper package is always delayed, because it does
3201 -- not constitute a freeze point, but to insure that the
3202 -- freeze node is placed properly, it is created directly
3203 -- when instantiating the body (otherwise the freeze node
3204 -- might appear to early for nested instantiations).
3206 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3208 -- For ASIS purposes, indicate that the wrapper package has
3209 -- replaced the instantiation node.
3211 Rewrite (N, Unit (Parent (N)));
3212 Set_Unit (Parent (N), N);
3215 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3217 -- Replace instance node for library-level instantiations
3218 -- of intrinsic subprograms, for ASIS use.
3220 Rewrite (N, Unit (Parent (N)));
3221 Set_Unit (Parent (N), N);
3224 if Parent_Installed then
3229 Generic_Renamings.Set_Last (0);
3230 Generic_Renamings_HTable.Reset;
3234 when Instantiation_Error =>
3235 if Parent_Installed then
3238 end Analyze_Subprogram_Instantiation;
3240 -------------------------
3241 -- Get_Associated_Node --
3242 -------------------------
3244 function Get_Associated_Node (N : Node_Id) return Node_Id is
3245 Assoc : Node_Id := Associated_Node (N);
3248 if Nkind (Assoc) /= Nkind (N) then
3251 elsif Nkind (Assoc) = N_Aggregate
3252 or else Nkind (Assoc) = N_Extension_Aggregate
3256 -- If the node is part of an inner generic, it may itself have been
3257 -- remapped into a further generic copy. Associated_Node is otherwise
3258 -- used for the entity of the node, and will be of a different node
3259 -- kind, or else N has been rewritten as a literal or function call.
3261 while Present (Associated_Node (Assoc))
3262 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3264 Assoc := Associated_Node (Assoc);
3267 -- Follow and additional link in case the final node was rewritten.
3268 -- This can only happen with nested generic units.
3270 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3271 and then Present (Associated_Node (Assoc))
3272 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3274 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3276 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3278 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3280 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3282 Assoc := Associated_Node (Assoc);
3287 end Get_Associated_Node;
3289 -------------------------------------------
3290 -- Build_Instance_Compilation_Unit_Nodes --
3291 -------------------------------------------
3293 procedure Build_Instance_Compilation_Unit_Nodes
3298 Decl_Cunit : Node_Id;
3299 Body_Cunit : Node_Id;
3301 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3302 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3305 -- A new compilation unit node is built for the instance declaration
3308 Make_Compilation_Unit (Sloc (N),
3309 Context_Items => Empty_List,
3312 Make_Compilation_Unit_Aux (Sloc (N)));
3314 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3315 Set_Body_Required (Decl_Cunit, True);
3317 -- We use the original instantiation compilation unit as the resulting
3318 -- compilation unit of the instance, since this is the main unit.
3320 Rewrite (N, Act_Body);
3321 Body_Cunit := Parent (N);
3323 -- The two compilation unit nodes are linked by the Library_Unit field
3325 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3326 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3328 -- If the instance is not the main unit, its context, categorization,
3329 -- and elaboration entity are not relevant to the compilation.
3331 if Parent (N) /= Cunit (Main_Unit) then
3335 -- The context clause items on the instantiation, which are now
3336 -- attached to the body compilation unit (since the body overwrote
3337 -- the original instantiation node), semantically belong on the spec,
3338 -- so copy them there. It's harmless to leave them on the body as well.
3339 -- In fact one could argue that they belong in both places.
3341 Citem := First (Context_Items (Body_Cunit));
3342 while Present (Citem) loop
3343 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3347 -- Propagate categorization flags on packages, so that they appear
3348 -- in ali file for the spec of the unit.
3350 if Ekind (New_Main) = E_Package then
3351 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3352 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3353 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3354 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3355 Set_Is_Remote_Call_Interface
3356 (Old_Main, Is_Remote_Call_Interface (New_Main));
3359 -- Make entry in Units table, so that binder can generate call to
3360 -- elaboration procedure for body, if any.
3362 Make_Instance_Unit (Body_Cunit);
3363 Main_Unit_Entity := New_Main;
3364 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3366 -- Build elaboration entity, since the instance may certainly
3367 -- generate elaboration code requiring a flag for protection.
3369 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3370 end Build_Instance_Compilation_Unit_Nodes;
3372 -----------------------------------
3373 -- Check_Formal_Package_Instance --
3374 -----------------------------------
3376 -- If the formal has specific parameters, they must match those of the
3377 -- actual. Both of them are instances, and the renaming declarations
3378 -- for their formal parameters appear in the same order in both. The
3379 -- analyzed formal has been analyzed in the context of the current
3382 procedure Check_Formal_Package_Instance
3383 (Formal_Pack : Entity_Id;
3384 Actual_Pack : Entity_Id)
3386 E1 : Entity_Id := First_Entity (Actual_Pack);
3387 E2 : Entity_Id := First_Entity (Formal_Pack);
3392 procedure Check_Mismatch (B : Boolean);
3393 -- Common error routine for mismatch between the parameters of
3394 -- the actual instance and those of the formal package.
3396 procedure Check_Mismatch (B : Boolean) is
3400 ("actual for & in actual instance does not match formal",
3401 Parent (Actual_Pack), E1);
3405 -- Start of processing for Check_Formal_Package_Instance
3409 and then Present (E2)
3411 exit when Ekind (E1) = E_Package
3412 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3414 if Is_Type (E1) then
3416 -- Subtypes must statically match. E1 and E2 are the
3417 -- local entities that are subtypes of the actuals.
3418 -- Itypes generated for other parameters need not be checked,
3419 -- the check will be performed on the parameters themselves.
3421 if not Is_Itype (E1)
3422 and then not Is_Itype (E2)
3426 or else Etype (E1) /= Etype (E2)
3427 or else not Subtypes_Statically_Match (E1, E2));
3430 elsif Ekind (E1) = E_Constant then
3432 -- IN parameters must denote the same static value, or
3433 -- the same constant, or the literal null.
3435 Expr1 := Expression (Parent (E1));
3437 if Ekind (E2) /= E_Constant then
3438 Check_Mismatch (True);
3441 Expr2 := Expression (Parent (E2));
3444 if Is_Static_Expression (Expr1) then
3446 if not Is_Static_Expression (Expr2) then
3447 Check_Mismatch (True);
3449 elsif Is_Integer_Type (Etype (E1)) then
3452 V1 : Uint := Expr_Value (Expr1);
3453 V2 : Uint := Expr_Value (Expr2);
3455 Check_Mismatch (V1 /= V2);
3458 elsif Is_Real_Type (Etype (E1)) then
3461 V1 : Ureal := Expr_Value_R (Expr1);
3462 V2 : Ureal := Expr_Value_R (Expr2);
3464 Check_Mismatch (V1 /= V2);
3467 elsif Is_String_Type (Etype (E1))
3468 and then Nkind (Expr1) = N_String_Literal
3471 if Nkind (Expr2) /= N_String_Literal then
3472 Check_Mismatch (True);
3475 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3479 elsif Is_Entity_Name (Expr1) then
3480 if Is_Entity_Name (Expr2) then
3481 if Entity (Expr1) = Entity (Expr2) then
3484 elsif Ekind (Entity (Expr2)) = E_Constant
3485 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3487 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3491 Check_Mismatch (True);
3494 Check_Mismatch (True);
3497 elsif Nkind (Expr1) = N_Null then
3498 Check_Mismatch (Nkind (Expr1) /= N_Null);
3501 Check_Mismatch (True);
3504 elsif Ekind (E1) = E_Variable
3505 or else Ekind (E1) = E_Package
3508 (Ekind (E1) /= Ekind (E2)
3509 or else Renamed_Object (E1) /= Renamed_Object (E2));
3511 elsif Is_Overloadable (E1) then
3513 -- Verify that the names of the entities match.
3514 -- What if actual is an attribute ???
3517 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3520 raise Program_Error;
3527 end Check_Formal_Package_Instance;
3529 ---------------------------
3530 -- Check_Formal_Packages --
3531 ---------------------------
3533 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3535 Formal_P : Entity_Id;
3538 -- Iterate through the declarations in the instance, looking for
3539 -- package renaming declarations that denote instances of formal
3540 -- packages. Stop when we find the renaming of the current package
3541 -- itself. The declaration for a formal package without a box is
3542 -- followed by an internal entity that repeats the instantiation.
3544 E := First_Entity (P_Id);
3545 while Present (E) loop
3546 if Ekind (E) = E_Package then
3547 if Renamed_Object (E) = P_Id then
3550 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3553 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3554 Formal_P := Next_Entity (E);
3555 Check_Formal_Package_Instance (Formal_P, E);
3561 end Check_Formal_Packages;
3563 ---------------------------------
3564 -- Check_Forward_Instantiation --
3565 ---------------------------------
3567 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id) is
3569 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3572 -- The instantiation appears before the generic body if we are in the
3573 -- scope of the unit containing the generic, either in its spec or in
3574 -- the package body. and before the generic body.
3576 if Ekind (Gen_Comp) = E_Package_Body then
3577 Gen_Comp := Spec_Entity (Gen_Comp);
3580 if In_Open_Scopes (Gen_Comp)
3581 and then No (Corresponding_Body (Decl))
3586 and then not Is_Compilation_Unit (S)
3587 and then not Is_Child_Unit (S)
3589 if Ekind (S) = E_Package then
3590 Set_Has_Forward_Instantiation (S);
3596 end Check_Forward_Instantiation;
3598 ---------------------------
3599 -- Check_Generic_Actuals --
3600 ---------------------------
3602 -- The visibility of the actuals may be different between the
3603 -- point of generic instantiation and the instantiation of the body.
3605 procedure Check_Generic_Actuals
3606 (Instance : Entity_Id;
3607 Is_Formal_Box : Boolean)
3613 E := First_Entity (Instance);
3614 while Present (E) loop
3616 and then Nkind (Parent (E)) = N_Subtype_Declaration
3617 and then Scope (Etype (E)) /= Instance
3618 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3620 Check_Private_View (Subtype_Indication (Parent (E)));
3621 Set_Is_Generic_Actual_Type (E, True);
3622 Set_Is_Hidden (E, False);
3624 -- We constructed the generic actual type as a subtype of
3625 -- the supplied type. This means that it normally would not
3626 -- inherit subtype specific attributes of the actual, which
3627 -- is wrong for the generic case.
3629 Astype := Ancestor_Subtype (E);
3633 -- can happen when E is an itype that is the full view of
3634 -- a private type completed, e.g. with a constrained array.
3636 Astype := Base_Type (E);
3639 Set_Size_Info (E, (Astype));
3640 Set_RM_Size (E, RM_Size (Astype));
3641 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3643 if Is_Discrete_Or_Fixed_Point_Type (E) then
3644 Set_RM_Size (E, RM_Size (Astype));
3646 -- In nested instances, the base type of an access actual
3647 -- may itself be private, and need to be exchanged.
3649 elsif Is_Access_Type (E)
3650 and then Is_Private_Type (Etype (E))
3653 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3656 elsif Ekind (E) = E_Package then
3658 -- If this is the renaming for the current instance, we're done.
3659 -- Otherwise it is a formal package. If the corresponding formal
3660 -- was declared with a box, the (instantiations of the) generic
3661 -- formal part are also visible. Otherwise, ignore the entity
3662 -- created to validate the actuals.
3664 if Renamed_Object (E) = Instance then
3667 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3670 -- The visibility of a formal of an enclosing generic is already
3673 elsif Denotes_Formal_Package (E) then
3676 elsif Present (Associated_Formal_Package (E))
3677 and then Box_Present (Parent (Associated_Formal_Package (E)))
3679 Check_Generic_Actuals (Renamed_Object (E), True);
3680 Set_Is_Hidden (E, False);
3684 Set_Is_Hidden (E, not Is_Formal_Box);
3690 end Check_Generic_Actuals;
3692 ------------------------------
3693 -- Check_Generic_Child_Unit --
3694 ------------------------------
3696 procedure Check_Generic_Child_Unit
3698 Parent_Installed : in out Boolean)
3700 Loc : constant Source_Ptr := Sloc (Gen_Id);
3701 Gen_Par : Entity_Id := Empty;
3702 Inst_Par : Entity_Id;
3706 function Find_Generic_Child
3710 -- Search generic parent for possible child unit.
3712 function In_Enclosing_Instance return Boolean;
3713 -- Within an instance of the parent, the child unit may be denoted
3714 -- by a simple name. Examine enclosing scopes to locate a possible
3715 -- parent instantiation.
3717 function Find_Generic_Child
3725 -- If entity of name is already set, instance has already been
3726 -- resolved, e.g. in an enclosing instantiation.
3728 if Present (Entity (Id)) then
3729 if Scope (Entity (Id)) = Scop then
3736 E := First_Entity (Scop);
3737 while Present (E) loop
3738 if Chars (E) = Chars (Id)
3739 and then Is_Child_Unit (E)
3741 if Is_Child_Unit (E)
3742 and then not Is_Visible_Child_Unit (E)
3745 ("generic child unit& is not visible", Gen_Id, E);
3757 end Find_Generic_Child;
3759 function In_Enclosing_Instance return Boolean is
3760 Enclosing_Instance : Node_Id;
3763 Enclosing_Instance := Current_Scope;
3765 while Present (Enclosing_Instance) loop
3766 exit when Ekind (Enclosing_Instance) = E_Package
3767 and then Nkind (Parent (Enclosing_Instance)) =
3768 N_Package_Specification
3770 (Generic_Parent (Parent (Enclosing_Instance)));
3772 Enclosing_Instance := Scope (Enclosing_Instance);
3775 if Present (Enclosing_Instance) then
3776 E := Find_Generic_Child
3777 (Generic_Parent (Parent (Enclosing_Instance)), Gen_Id);
3784 Make_Expanded_Name (Loc,
3786 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
3787 Selector_Name => New_Occurrence_Of (E, Loc)));
3789 Set_Entity (Gen_Id, E);
3790 Set_Etype (Gen_Id, Etype (E));
3791 Parent_Installed := False; -- Already in scope.
3797 end In_Enclosing_Instance;
3799 -- Start of processing for Check_Generic_Child_Unit
3802 -- If the name of the generic is given by a selected component, it
3803 -- may be the name of a generic child unit, and the prefix is the name
3804 -- of an instance of the parent, in which case the child unit must be
3805 -- visible. If this instance is not in scope, it must be placed there
3806 -- and removed after instantiation, because what is being instantiated
3807 -- is not the original child, but the corresponding child present in
3808 -- the instance of the parent.
3810 -- If the child is instantiated within the parent, it can be given by
3811 -- a simple name. In this case the instance is already in scope, but
3812 -- the child generic must be recovered from the generic parent as well.
3814 if Nkind (Gen_Id) = N_Selected_Component then
3815 S := Selector_Name (Gen_Id);
3816 Analyze (Prefix (Gen_Id));
3817 Inst_Par := Entity (Prefix (Gen_Id));
3819 if Ekind (Inst_Par) = E_Package
3820 and then Present (Renamed_Object (Inst_Par))
3822 Inst_Par := Renamed_Object (Inst_Par);
3825 if Ekind (Inst_Par) = E_Package then
3826 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
3827 Gen_Par := Generic_Parent (Parent (Inst_Par));
3829 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
3831 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
3833 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
3836 elsif Ekind (Inst_Par) = E_Generic_Package
3837 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
3840 -- A formal package may be a real child package, and not the
3841 -- implicit instance within a parent. In this case the child is
3842 -- not visible and has to be retrieved explicitly as well.
3844 Gen_Par := Inst_Par;
3847 if Present (Gen_Par) then
3849 -- The prefix denotes an instantiation. The entity itself
3850 -- may be a nested generic, or a child unit.
3852 E := Find_Generic_Child (Gen_Par, S);
3855 Change_Selected_Component_To_Expanded_Name (Gen_Id);
3856 Set_Entity (Gen_Id, E);
3857 Set_Etype (Gen_Id, Etype (E));
3859 Set_Etype (S, Etype (E));
3861 -- Indicate that this is a reference to the parent.
3863 if In_Extended_Main_Source_Unit (Gen_Id) then
3864 Set_Is_Instantiated (Inst_Par);
3867 -- A common mistake is to replicate the naming scheme of
3868 -- a hierarchy by instantiating a generic child directly,
3869 -- rather than the implicit child in a parent instance:
3871 -- generic .. package Gpar is ..
3872 -- generic .. package Gpar.Child is ..
3873 -- package Par is new Gpar ();
3876 -- package Par.Child is new Gpar.Child ();
3877 -- rather than Par.Child
3879 -- In this case the instantiation is within Par, which is
3880 -- an instance, but Gpar does not denote Par because we are
3881 -- not IN the instance of Gpar, so this is illegal. The test
3882 -- below recognizes this particular case.
3884 if Is_Child_Unit (E)
3885 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
3886 and then (not In_Instance
3887 or else Nkind (Parent (Parent (Gen_Id))) =
3891 ("prefix of generic child unit must be instance of parent",
3895 if not In_Open_Scopes (Inst_Par)
3896 and then Nkind (Parent (Gen_Id))
3897 not in N_Generic_Renaming_Declaration
3899 Install_Parent (Inst_Par);
3900 Parent_Installed := True;
3904 -- If the generic parent does not contain an entity that
3905 -- corresponds to the selector, the instance doesn't either.
3906 -- Analyzing the node will yield the appropriate error message.
3907 -- If the entity is not a child unit, then it is an inner
3908 -- generic in the parent.
3916 if Is_Child_Unit (Entity (Gen_Id))
3917 and then Nkind (Parent (Gen_Id))
3918 not in N_Generic_Renaming_Declaration
3919 and then not In_Open_Scopes (Inst_Par)
3921 Install_Parent (Inst_Par);
3922 Parent_Installed := True;
3926 elsif Nkind (Gen_Id) = N_Expanded_Name then
3928 -- Entity already present, analyze prefix, whose meaning may be
3929 -- an instance in the current context. If it is an instance of
3930 -- a relative within another, the proper parent may still have
3931 -- to be installed, if they are not of the same generation.
3933 Analyze (Prefix (Gen_Id));
3934 Inst_Par := Entity (Prefix (Gen_Id));
3936 if In_Enclosing_Instance then
3939 elsif Present (Entity (Gen_Id))
3940 and then Is_Child_Unit (Entity (Gen_Id))
3941 and then not In_Open_Scopes (Inst_Par)
3943 Install_Parent (Inst_Par);
3944 Parent_Installed := True;
3947 elsif In_Enclosing_Instance then
3948 -- The child unit is found in some enclosing scope.
3954 -- If this is the renaming of the implicit child in a parent
3955 -- instance, recover the parent name and install it.
3957 if Is_Entity_Name (Gen_Id) then
3958 E := Entity (Gen_Id);
3960 if Is_Generic_Unit (E)
3961 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
3962 and then Is_Child_Unit (Renamed_Object (E))
3963 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
3964 and then Nkind (Name (Parent (E))) = N_Expanded_Name
3967 New_Copy_Tree (Name (Parent (E))));
3968 Inst_Par := Entity (Prefix (Gen_Id));
3970 if not In_Open_Scopes (Inst_Par) then
3971 Install_Parent (Inst_Par);
3972 Parent_Installed := True;
3975 -- If it is a child unit of a non-generic parent, it may be
3976 -- use-visible and given by a direct name. Install parent as
3979 elsif Is_Generic_Unit (E)
3980 and then Is_Child_Unit (E)
3982 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
3983 and then not Is_Generic_Unit (Scope (E))
3985 if not In_Open_Scopes (Scope (E)) then
3986 Install_Parent (Scope (E));
3987 Parent_Installed := True;
3992 end Check_Generic_Child_Unit;
3994 -----------------------------
3995 -- Check_Hidden_Child_Unit --
3996 -----------------------------
3998 procedure Check_Hidden_Child_Unit
4000 Gen_Unit : Entity_Id;
4001 Act_Decl_Id : Entity_Id)
4003 Gen_Id : Node_Id := Name (N);
4006 if Is_Child_Unit (Gen_Unit)
4007 and then Is_Child_Unit (Act_Decl_Id)
4008 and then Nkind (Gen_Id) = N_Expanded_Name
4009 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4010 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4012 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4014 ("generic unit & is implicitly declared in &",
4015 Defining_Unit_Name (N), Gen_Unit);
4016 Error_Msg_N ("\instance must have different name",
4017 Defining_Unit_Name (N));
4019 end Check_Hidden_Child_Unit;
4021 ------------------------
4022 -- Check_Private_View --
4023 ------------------------
4025 procedure Check_Private_View (N : Node_Id) is
4026 T : constant Entity_Id := Etype (N);
4030 -- Exchange views if the type was not private in the generic but is
4031 -- private at the point of instantiation. Do not exchange views if
4032 -- the scope of the type is in scope. This can happen if both generic
4033 -- and instance are sibling units, or if type is defined in a parent.
4034 -- In this case the visibility of the type will be correct for all
4038 BT := Base_Type (T);
4040 if Is_Private_Type (T)
4041 and then not Has_Private_View (N)
4042 and then Present (Full_View (T))
4043 and then not In_Open_Scopes (Scope (T))
4045 -- In the generic, the full type was visible. Save the
4046 -- private entity, for subsequent exchange.
4050 elsif Has_Private_View (N)
4051 and then not Is_Private_Type (T)
4052 and then not Has_Been_Exchanged (T)
4053 and then Etype (Get_Associated_Node (N)) /= T
4055 -- Only the private declaration was visible in the generic. If
4056 -- the type appears in a subtype declaration, the subtype in the
4057 -- instance must have a view compatible with that of its parent,
4058 -- which must be exchanged (see corresponding code in Restore_
4059 -- Private_Views). Otherwise, if the type is defined in a parent
4060 -- unit, leave full visibility within instance, which is safe.
4062 if In_Open_Scopes (Scope (Base_Type (T)))
4063 and then not Is_Private_Type (Base_Type (T))
4064 and then Comes_From_Source (Base_Type (T))
4068 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4069 or else not In_Private_Part (Scope (Base_Type (T)))
4071 Append_Elmt (T, Exchanged_Views);
4072 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4075 -- For composite types with inconsistent representation
4076 -- exchange component types accordingly.
4078 elsif Is_Access_Type (T)
4079 and then Is_Private_Type (Designated_Type (T))
4080 and then Present (Full_View (Designated_Type (T)))
4082 Switch_View (Designated_Type (T));
4084 elsif Is_Array_Type (T)
4085 and then Is_Private_Type (Component_Type (T))
4086 and then not Has_Private_View (N)
4087 and then Present (Full_View (Component_Type (T)))
4089 Switch_View (Component_Type (T));
4091 elsif Is_Private_Type (T)
4092 and then Present (Full_View (T))
4093 and then Is_Array_Type (Full_View (T))
4094 and then Is_Private_Type (Component_Type (Full_View (T)))
4098 -- Finally, a non-private subtype may have a private base type,
4099 -- which must be exchanged for consistency. This can happen when
4100 -- instantiating a package body, when the scope stack is empty but
4101 -- in fact the subtype and the base type are declared in an enclosing
4104 elsif not Is_Private_Type (T)
4105 and then not Has_Private_View (N)
4106 and then Is_Private_Type (Base_Type (T))
4107 and then Present (Full_View (BT))
4108 and then not Is_Generic_Type (BT)
4109 and then not In_Open_Scopes (BT)
4111 Append_Elmt (Full_View (BT), Exchanged_Views);
4112 Exchange_Declarations (BT);
4115 end Check_Private_View;
4117 --------------------------
4118 -- Contains_Instance_Of --
4119 --------------------------
4121 function Contains_Instance_Of
4133 -- Verify that there are no circular instantiations. We check whether
4134 -- the unit contains an instance of the current scope or some enclosing
4135 -- scope (in case one of the instances appears in a subunit). Longer
4136 -- circularities involving subunits might seem too pathological to
4137 -- consider, but they were not too pathological for the authors of
4138 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4139 -- enclosing generic scopes as containing an instance.
4142 -- Within a generic subprogram body, the scope is not generic, to
4143 -- allow for recursive subprograms. Use the declaration to determine
4144 -- whether this is a generic unit.
4146 if Ekind (Scop) = E_Generic_Package
4147 or else (Is_Subprogram (Scop)
4148 and then Nkind (Unit_Declaration_Node (Scop)) =
4149 N_Generic_Subprogram_Declaration)
4151 Elmt := First_Elmt (Inner_Instances (Inner));
4153 while Present (Elmt) loop
4154 if Node (Elmt) = Scop then
4155 Error_Msg_Node_2 := Inner;
4157 ("circular Instantiation: & instantiated within &!",
4161 elsif Node (Elmt) = Inner then
4164 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4165 Error_Msg_Node_2 := Inner;
4167 ("circular Instantiation: & instantiated within &!",
4175 -- Indicate that Inner is being instantiated within Scop.
4177 Append_Elmt (Inner, Inner_Instances (Scop));
4180 if Scop = Standard_Standard then
4183 Scop := Scope (Scop);
4188 end Contains_Instance_Of;
4190 -----------------------
4191 -- Copy_Generic_Node --
4192 -----------------------
4194 function Copy_Generic_Node
4196 Parent_Id : Node_Id;
4197 Instantiating : Boolean)
4203 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4204 -- Check the given value of one of the Fields referenced by the
4205 -- current node to determine whether to copy it recursively. The
4206 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4207 -- value (Sloc, Uint, Char) in which case it need not be copied.
4209 procedure Copy_Descendants;
4210 -- Common utility for various nodes.
4212 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4213 -- Make copy of element list.
4215 function Copy_Generic_List
4217 Parent_Id : Node_Id)
4219 -- Apply Copy_Node recursively to the members of a node list.
4221 -----------------------
4222 -- Copy_Descendants --
4223 -----------------------
4225 procedure Copy_Descendants is
4227 use Atree.Unchecked_Access;
4228 -- This code section is part of the implementation of an untyped
4229 -- tree traversal, so it needs direct access to node fields.
4232 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4233 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4234 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4235 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4236 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4237 end Copy_Descendants;
4239 -----------------------------
4240 -- Copy_Generic_Descendant --
4241 -----------------------------
4243 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4245 if D = Union_Id (Empty) then
4248 elsif D in Node_Range then
4250 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4252 elsif D in List_Range then
4253 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4255 elsif D in Elist_Range then
4256 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4258 -- Nothing else is copyable (e.g. Uint values), return as is
4263 end Copy_Generic_Descendant;
4265 ------------------------
4266 -- Copy_Generic_Elist --
4267 ------------------------
4269 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4276 M := First_Elmt (E);
4277 while Present (M) loop
4279 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4288 end Copy_Generic_Elist;
4290 -----------------------
4291 -- Copy_Generic_List --
4292 -----------------------
4294 function Copy_Generic_List
4296 Parent_Id : Node_Id)
4305 Set_Parent (New_L, Parent_Id);
4308 while Present (N) loop
4309 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4318 end Copy_Generic_List;
4320 -- Start of processing for Copy_Generic_Node
4327 New_N := New_Copy (N);
4329 if Instantiating then
4330 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4333 if not Is_List_Member (N) then
4334 Set_Parent (New_N, Parent_Id);
4337 -- If defining identifier, then all fields have been copied already
4339 if Nkind (New_N) in N_Entity then
4342 -- Special casing for identifiers and other entity names and operators
4344 elsif (Nkind (New_N) = N_Identifier
4345 or else Nkind (New_N) = N_Character_Literal
4346 or else Nkind (New_N) = N_Expanded_Name
4347 or else Nkind (New_N) = N_Operator_Symbol
4348 or else Nkind (New_N) in N_Op)
4350 if not Instantiating then
4352 -- Link both nodes in order to assign subsequently the
4353 -- entity of the copy to the original node, in case this
4354 -- is a global reference.
4356 Set_Associated_Node (N, New_N);
4358 -- If we are within an instantiation, this is a nested generic
4359 -- that has already been analyzed at the point of definition. We
4360 -- must preserve references that were global to the enclosing
4361 -- parent at that point. Other occurrences, whether global or
4362 -- local to the current generic, must be resolved anew, so we
4363 -- reset the entity in the generic copy. A global reference has
4364 -- a smaller depth than the parent, or else the same depth in
4365 -- case both are distinct compilation units.
4367 -- It is also possible for Current_Instantiated_Parent to be
4368 -- defined, and for this not to be a nested generic, namely
4369 -- if the unit is loaded through Rtsfind. In that case, the
4370 -- entity of New_N is only a link to the associated node, and
4371 -- not a defining occurrence.
4373 -- The entities for parent units in the defining_program_unit
4374 -- of a generic child unit are established when the context of
4375 -- the unit is first analyzed, before the generic copy is made.
4376 -- They are preserved in the copy for use in ASIS queries.
4378 Ent := Entity (New_N);
4380 if No (Current_Instantiated_Parent.Gen_Id) then
4382 or else Nkind (Ent) /= N_Defining_Identifier
4383 or else Nkind (Parent (N)) /= N_Defining_Program_Unit_Name
4385 Set_Associated_Node (New_N, Empty);
4390 not (Nkind (Ent) = N_Defining_Identifier
4392 Nkind (Ent) = N_Defining_Character_Literal
4394 Nkind (Ent) = N_Defining_Operator_Symbol)
4395 or else No (Scope (Ent))
4396 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4397 or else (Scope_Depth (Scope (Ent)) >
4398 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4400 Get_Source_Unit (Ent) =
4401 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4403 Set_Associated_Node (New_N, Empty);
4406 -- Case of instantiating identifier or some other name or operator
4409 -- If the associated node is still defined, the entity in
4410 -- it is global, and must be copied to the instance.
4412 if Present (Get_Associated_Node (N)) then
4413 if Nkind (Get_Associated_Node (N)) = Nkind (N) then
4414 Set_Entity (New_N, Entity (Get_Associated_Node (N)));
4415 Check_Private_View (N);
4417 elsif Nkind (Get_Associated_Node (N)) = N_Function_Call then
4418 Set_Entity (New_N, Entity (Name (Get_Associated_Node (N))));
4421 Set_Entity (New_N, Empty);
4426 -- For expanded name, we must copy the Prefix and Selector_Name
4428 if Nkind (N) = N_Expanded_Name then
4431 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4433 Set_Selector_Name (New_N,
4434 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4436 -- For operators, we must copy the right operand
4438 elsif Nkind (N) in N_Op then
4440 Set_Right_Opnd (New_N,
4441 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4443 -- And for binary operators, the left operand as well
4445 if Nkind (N) in N_Binary_Op then
4446 Set_Left_Opnd (New_N,
4447 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4451 -- Special casing for stubs
4453 elsif Nkind (N) in N_Body_Stub then
4455 -- In any case, we must copy the specification or defining
4456 -- identifier as appropriate.
4458 if Nkind (N) = N_Subprogram_Body_Stub then
4459 Set_Specification (New_N,
4460 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4463 Set_Defining_Identifier (New_N,
4465 (Defining_Identifier (N), New_N, Instantiating));
4468 -- If we are not instantiating, then this is where we load and
4469 -- analyze subunits, i.e. at the point where the stub occurs. A
4470 -- more permissivle system might defer this analysis to the point
4471 -- of instantiation, but this seems to complicated for now.
4473 if not Instantiating then
4475 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4477 Unum : Unit_Number_Type;
4483 (Load_Name => Subunit_Name,
4488 -- If the proper body is not found, a warning message will
4489 -- be emitted when analyzing the stub, or later at the the
4490 -- point of instantiation. Here we just leave the stub as is.
4492 if Unum = No_Unit then
4493 Subunits_Missing := True;
4494 goto Subunit_Not_Found;
4497 Subunit := Cunit (Unum);
4499 -- We must create a generic copy of the subunit, in order
4500 -- to perform semantic analysis on it, and we must replace
4501 -- the stub in the original generic unit with the subunit,
4502 -- in order to preserve non-local references within.
4504 -- Only the proper body needs to be copied. Library_Unit and
4505 -- context clause are simply inherited by the generic copy.
4506 -- Note that the copy (which may be recursive if there are
4507 -- nested subunits) must be done first, before attaching it
4508 -- to the enclosing generic.
4512 (Proper_Body (Unit (Subunit)),
4513 Empty, Instantiating => False);
4515 -- Now place the original proper body in the original
4516 -- generic unit. This is a body, not a compilation unit.
4518 Rewrite (N, Proper_Body (Unit (Subunit)));
4519 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4520 Set_Was_Originally_Stub (N);
4522 -- Finally replace the body of the subunit with its copy,
4523 -- and make this new subunit into the library unit of the
4524 -- generic copy, which does not have stubs any longer.
4526 Set_Proper_Body (Unit (Subunit), New_Body);
4527 Set_Library_Unit (New_N, Subunit);
4528 Inherit_Context (Unit (Subunit), N);
4532 -- If we are instantiating, this must be an error case, since
4533 -- otherwise we would have replaced the stub node by the proper
4534 -- body that corresponds. So just ignore it in the copy (i.e.
4535 -- we have copied it, and that is good enough).
4541 <<Subunit_Not_Found>> null;
4543 -- If the node is a compilation unit, it is the subunit of a stub,
4544 -- which has been loaded already (see code below). In this case,
4545 -- the library unit field of N points to the parent unit (which
4546 -- is a compilation unit) and need not (and cannot!) be copied.
4548 -- When the proper body of the stub is analyzed, thie library_unit
4549 -- link is used to establish the proper context (see sem_ch10).
4551 -- The other fields of a compilation unit are copied as usual
4553 elsif Nkind (N) = N_Compilation_Unit then
4555 -- This code can only be executed when not instantiating, because
4556 -- in the copy made for an instantiation, the compilation unit
4557 -- node has disappeared at the point that a stub is replaced by
4560 pragma Assert (not Instantiating);
4562 Set_Context_Items (New_N,
4563 Copy_Generic_List (Context_Items (N), New_N));
4566 Copy_Generic_Node (Unit (N), New_N, False));
4568 Set_First_Inlined_Subprogram (New_N,
4570 (First_Inlined_Subprogram (N), New_N, False));
4572 Set_Aux_Decls_Node (New_N,
4573 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4575 -- For an assignment node, the assignment is known to be semantically
4576 -- legal if we are instantiating the template. This avoids incorrect
4577 -- diagnostics in generated code.
4579 elsif Nkind (N) = N_Assignment_Statement then
4581 -- Copy name and expression fields in usual manner
4584 Copy_Generic_Node (Name (N), New_N, Instantiating));
4586 Set_Expression (New_N,
4587 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4589 if Instantiating then
4590 Set_Assignment_OK (Name (New_N), True);
4593 elsif Nkind (N) = N_Aggregate
4594 or else Nkind (N) = N_Extension_Aggregate
4597 if not Instantiating then
4598 Set_Associated_Node (N, New_N);
4601 if Present (Get_Associated_Node (N))
4602 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
4604 -- In the generic the aggregate has some composite type.
4605 -- If at the point of instantiation the type has a private
4606 -- view, install the full view (and that of its ancestors,
4610 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
4615 and then Is_Private_Type (T)
4621 and then Is_Tagged_Type (T)
4622 and then Is_Derived_Type (T)
4624 Rt := Root_Type (T);
4629 if Is_Private_Type (T) then
4640 -- Do not copy the associated node, which points to
4641 -- the generic copy of the aggregate.
4644 use Atree.Unchecked_Access;
4645 -- This code section is part of the implementation of an untyped
4646 -- tree traversal, so it needs direct access to node fields.
4649 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4650 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4651 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4652 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4655 -- Allocators do not have an identifier denoting the access type,
4656 -- so we must locate it through the expression to check whether
4657 -- the views are consistent.
4659 elsif Nkind (N) = N_Allocator
4660 and then Nkind (Expression (N)) = N_Qualified_Expression
4661 and then Instantiating
4664 T : Node_Id := Get_Associated_Node (Subtype_Mark (Expression (N)));
4669 -- Retrieve the allocator node in the generic copy.
4671 Acc_T := Etype (Parent (Parent (T)));
4673 and then Is_Private_Type (Acc_T)
4675 Switch_View (Acc_T);
4682 -- For a proper body, we must catch the case of a proper body that
4683 -- replaces a stub. This represents the point at which a separate
4684 -- compilation unit, and hence template file, may be referenced, so
4685 -- we must make a new source instantiation entry for the template
4686 -- of the subunit, and ensure that all nodes in the subunit are
4687 -- adjusted using this new source instantiation entry.
4689 elsif Nkind (N) in N_Proper_Body then
4692 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4695 if Instantiating and then Was_Originally_Stub (N) then
4696 Create_Instantiation_Source
4697 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4700 -- Now copy the fields of the proper body, using the new
4701 -- adjustment factor if one was needed as per test above.
4705 -- Restore the original adjustment factor in case changed
4707 S_Adjustment := Save_Adjustment;
4710 -- Don't copy Ident or Comment pragmas, since the comment belongs
4711 -- to the generic unit, not to the instantiating unit.
4713 elsif Nkind (N) = N_Pragma
4714 and then Instantiating
4717 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4720 if Prag_Id = Pragma_Ident
4721 or else Prag_Id = Pragma_Comment
4723 New_N := Make_Null_Statement (Sloc (N));
4730 -- For the remaining nodes, copy recursively their descendants.
4736 and then Nkind (N) = N_Subprogram_Body
4738 Set_Generic_Parent (Specification (New_N), N);
4743 end Copy_Generic_Node;
4745 ----------------------------
4746 -- Denotes_Formal_Package --
4747 ----------------------------
4749 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4750 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4751 Scop : Entity_Id := Scope (Pack);
4755 if Ekind (Scop) = E_Generic_Package
4756 or else Nkind (Unit_Declaration_Node (Scop))
4757 = N_Generic_Subprogram_Declaration
4761 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4768 -- Check whether this package is associated with a formal
4769 -- package of the enclosing instantiation. Iterate over the
4770 -- list of renamings.
4772 E := First_Entity (Par);
4773 while Present (E) loop
4775 if Ekind (E) /= E_Package
4776 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4779 elsif Renamed_Object (E) = Par then
4782 elsif Renamed_Object (E) = Pack then
4791 end Denotes_Formal_Package;
4797 procedure End_Generic is
4799 -- ??? More things could be factored out in this
4800 -- routine. Should probably be done at a later stage.
4802 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4803 Generic_Flags.Decrement_Last;
4805 Expander_Mode_Restore;
4808 ----------------------
4809 -- Find_Actual_Type --
4810 ----------------------
4812 function Find_Actual_Type
4814 Gen_Scope : Entity_Id)
4820 if not Is_Child_Unit (Gen_Scope) then
4821 return Get_Instance_Of (Typ);
4823 elsif not Is_Generic_Type (Typ)
4824 or else Scope (Typ) = Gen_Scope
4826 return Get_Instance_Of (Typ);
4829 T := Current_Entity (Typ);
4830 while Present (T) loop
4831 if In_Open_Scopes (Scope (T)) then
4840 end Find_Actual_Type;
4842 ----------------------------
4843 -- Freeze_Subprogram_Body --
4844 ----------------------------
4846 procedure Freeze_Subprogram_Body
4847 (Inst_Node : Node_Id;
4849 Pack_Id : Entity_Id)
4852 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
4853 Par : constant Entity_Id := Scope (Gen_Unit);
4858 function Earlier (N1, N2 : Node_Id) return Boolean;
4859 -- Yields True if N1 and N2 appear in the same compilation unit,
4860 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4861 -- traversal of the tree for the unit.
4863 function Enclosing_Body (N : Node_Id) return Node_Id;
4864 -- Find innermost package body that encloses the given node, and which
4865 -- is not a compilation unit. Freeze nodes for the instance, or for its
4866 -- enclosing body, may be inserted after the enclosing_body of the
4869 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4870 -- Find entity for given package body, and locate or create a freeze
4873 function True_Parent (N : Node_Id) return Node_Id;
4874 -- For a subunit, return parent of corresponding stub.
4880 function Earlier (N1, N2 : Node_Id) return Boolean is
4886 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4887 -- Find distance from given node to enclosing compilation unit.
4889 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4892 and then Nkind (P) /= N_Compilation_Unit
4894 P := True_Parent (P);
4900 Find_Depth (P1, D1);
4901 Find_Depth (P2, D2);
4911 P1 := True_Parent (P1);
4916 P2 := True_Parent (P2);
4920 -- At this point P1 and P2 are at the same distance from the root.
4921 -- We examine their parents until we find a common declarative
4922 -- list, at which point we can establish their relative placement
4923 -- by comparing their ultimate slocs. If we reach the root,
4924 -- N1 and N2 do not descend from the same declarative list (e.g.
4925 -- one is nested in the declarative part and the other is in a block
4926 -- in the statement part) and the earlier one is already frozen.
4928 while not Is_List_Member (P1)
4929 or else not Is_List_Member (P2)
4930 or else List_Containing (P1) /= List_Containing (P2)
4932 P1 := True_Parent (P1);
4933 P2 := True_Parent (P2);
4935 if Nkind (Parent (P1)) = N_Subunit then
4936 P1 := Corresponding_Stub (Parent (P1));
4939 if Nkind (Parent (P2)) = N_Subunit then
4940 P2 := Corresponding_Stub (Parent (P2));
4949 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4952 --------------------
4953 -- Enclosing_Body --
4954 --------------------
4956 function Enclosing_Body (N : Node_Id) return Node_Id is
4957 P : Node_Id := Parent (N);
4961 and then Nkind (Parent (P)) /= N_Compilation_Unit
4963 if Nkind (P) = N_Package_Body then
4965 if Nkind (Parent (P)) = N_Subunit then
4966 return Corresponding_Stub (Parent (P));
4972 P := True_Parent (P);
4978 -------------------------
4979 -- Package_Freeze_Node --
4980 -------------------------
4982 function Package_Freeze_Node (B : Node_Id) return Node_Id is
4986 if Nkind (B) = N_Package_Body then
4987 Id := Corresponding_Spec (B);
4989 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
4990 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
4993 Ensure_Freeze_Node (Id);
4994 return Freeze_Node (Id);
4995 end Package_Freeze_Node;
5001 function True_Parent (N : Node_Id) return Node_Id is
5003 if Nkind (Parent (N)) = N_Subunit then
5004 return Parent (Corresponding_Stub (Parent (N)));
5010 -- Start of processing of Freeze_Subprogram_Body
5013 -- If the instance and the generic body appear within the same
5014 -- unit, and the instance preceeds the generic, the freeze node for
5015 -- the instance must appear after that of the generic. If the generic
5016 -- is nested within another instance I2, then current instance must
5017 -- be frozen after I2. In both cases, the freeze nodes are those of
5018 -- enclosing packages. Otherwise, the freeze node is placed at the end
5019 -- of the current declarative part.
5021 Enc_G := Enclosing_Body (Gen_Body);
5022 Enc_I := Enclosing_Body (Inst_Node);
5023 Ensure_Freeze_Node (Pack_Id);
5024 F_Node := Freeze_Node (Pack_Id);
5026 if Is_Generic_Instance (Par)
5027 and then Present (Freeze_Node (Par))
5029 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5031 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5032 -- The parent was a premature instantiation. Insert freeze
5033 -- node at the end the current declarative part.
5035 Insert_After_Last_Decl (Inst_Node, F_Node);
5038 Insert_After (Freeze_Node (Par), F_Node);
5041 -- The body enclosing the instance should be frozen after the body
5042 -- that includes the generic, because the body of the instance may
5043 -- make references to entities therein. If the two are not in the
5044 -- same declarative part, or if the one enclosing the instance is
5045 -- frozen already, freeze the instance at the end of the current
5046 -- declarative part.
5048 elsif Is_Generic_Instance (Par)
5049 and then Present (Freeze_Node (Par))
5050 and then Present (Enc_I)
5052 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5054 (Nkind (Enc_I) = N_Package_Body
5056 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5059 -- The enclosing package may contain several instances. Rather
5060 -- than computing the earliest point at which to insert its
5061 -- freeze node, we place it at the end of the declarative part
5062 -- of the parent of the generic.
5064 Insert_After_Last_Decl
5065 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5068 Insert_After_Last_Decl (Inst_Node, F_Node);
5070 elsif Present (Enc_G)
5071 and then Present (Enc_I)
5072 and then Enc_G /= Enc_I
5073 and then Earlier (Inst_Node, Gen_Body)
5075 if Nkind (Enc_G) = N_Package_Body then
5076 E_G_Id := Corresponding_Spec (Enc_G);
5077 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5079 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5082 -- Freeze package that encloses instance, and place node after
5083 -- package that encloses generic. If enclosing package is already
5084 -- frozen we have to assume it is at the proper place. This may
5085 -- be a potential ABE that requires dynamic checking.
5087 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5089 -- Freeze enclosing subunit before instance
5091 Ensure_Freeze_Node (E_G_Id);
5093 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5094 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5097 Insert_After_Last_Decl (Inst_Node, F_Node);
5101 -- If none of the above, insert freeze node at the end of the
5102 -- current declarative part.
5104 Insert_After_Last_Decl (Inst_Node, F_Node);
5106 end Freeze_Subprogram_Body;
5112 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5114 return Generic_Renamings.Table (E).Gen_Id;
5117 ---------------------
5118 -- Get_Instance_Of --
5119 ---------------------
5121 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5122 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5124 if Res /= Assoc_Null then
5125 return Generic_Renamings.Table (Res).Act_Id;
5127 -- On exit, entity is not instantiated: not a generic parameter,
5128 -- or else parameter of an inner generic unit.
5132 end Get_Instance_Of;
5134 ------------------------------------
5135 -- Get_Package_Instantiation_Node --
5136 ------------------------------------
5138 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5139 Decl : Node_Id := Unit_Declaration_Node (A);
5143 -- If the instantiation is a compilation unit that does not need a
5144 -- body then the instantiation node has been rewritten as a package
5145 -- declaration for the instance, and we return the original node.
5146 -- If it is a compilation unit and the instance node has not been
5147 -- rewritten, then it is still the unit of the compilation.
5148 -- Otherwise the instantiation node appears after the declaration.
5149 -- If the entity is a formal package, the declaration may have been
5150 -- rewritten as a generic declaration (in the case of a formal with a
5151 -- box) or left as a formal package declaration if it has actuals, and
5152 -- is found with a forward search.
5154 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5155 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5156 return Original_Node (Decl);
5158 return Unit (Parent (Decl));
5161 elsif Nkind (Decl) = N_Generic_Package_Declaration
5162 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5164 return Original_Node (Decl);
5167 Inst := Next (Decl);
5168 while Nkind (Inst) /= N_Package_Instantiation
5169 and then Nkind (Inst) /= N_Formal_Package_Declaration
5176 end Get_Package_Instantiation_Node;
5178 ------------------------
5179 -- Has_Been_Exchanged --
5180 ------------------------
5182 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5183 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5186 while Present (Next) loop
5187 if Full_View (Node (Next)) = E then
5195 end Has_Been_Exchanged;
5201 function Hash (F : Entity_Id) return HTable_Range is
5203 return HTable_Range (F mod HTable_Size);
5206 ------------------------
5207 -- Hide_Current_Scope --
5208 ------------------------
5210 procedure Hide_Current_Scope is
5211 C : constant Entity_Id := Current_Scope;
5215 Set_Is_Hidden_Open_Scope (C);
5216 E := First_Entity (C);
5218 while Present (E) loop
5219 if Is_Immediately_Visible (E) then
5220 Set_Is_Immediately_Visible (E, False);
5221 Append_Elmt (E, Hidden_Entities);
5227 -- Make the scope name invisible as well. This is necessary, but
5228 -- might conflict with calls to Rtsfind later on, in case the scope
5229 -- is a predefined one. There is no clean solution to this problem, so
5230 -- for now we depend on the user not redefining Standard itself in one
5231 -- of the parent units.
5233 if Is_Immediately_Visible (C)
5234 and then C /= Standard_Standard
5236 Set_Is_Immediately_Visible (C, False);
5237 Append_Elmt (C, Hidden_Entities);
5240 end Hide_Current_Scope;
5242 ------------------------------
5243 -- In_Same_Declarative_Part --
5244 ------------------------------
5246 function In_Same_Declarative_Part
5251 Decls : Node_Id := Parent (F_Node);
5252 Nod : Node_Id := Parent (Inst);
5255 while Present (Nod) loop
5259 elsif Nkind (Nod) = N_Subprogram_Body
5260 or else Nkind (Nod) = N_Package_Body
5261 or else Nkind (Nod) = N_Task_Body
5262 or else Nkind (Nod) = N_Protected_Body
5263 or else Nkind (Nod) = N_Block_Statement
5267 elsif Nkind (Nod) = N_Subunit then
5268 Nod := Corresponding_Stub (Nod);
5270 elsif Nkind (Nod) = N_Compilation_Unit then
5273 Nod := Parent (Nod);
5278 end In_Same_Declarative_Part;
5280 ---------------------
5281 -- Inherit_Context --
5282 ---------------------
5284 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5285 Current_Context : List_Id;
5286 Current_Unit : Node_Id;
5291 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5293 -- The inherited context is attached to the enclosing compilation
5294 -- unit. This is either the main unit, or the declaration for the
5295 -- main unit (in case the instantation appears within the package
5296 -- declaration and the main unit is its body).
5298 Current_Unit := Parent (Inst);
5299 while Present (Current_Unit)
5300 and then Nkind (Current_Unit) /= N_Compilation_Unit
5302 Current_Unit := Parent (Current_Unit);
5305 Current_Context := Context_Items (Current_Unit);
5307 Item := First (Context_Items (Parent (Gen_Decl)));
5308 while Present (Item) loop
5309 if Nkind (Item) = N_With_Clause then
5310 New_I := New_Copy (Item);
5311 Set_Implicit_With (New_I, True);
5312 Append (New_I, Current_Context);
5318 end Inherit_Context;
5320 ----------------------------
5321 -- Insert_After_Last_Decl --
5322 ----------------------------
5324 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5325 L : List_Id := List_Containing (N);
5326 P : Node_Id := Parent (L);
5329 if not Is_List_Member (F_Node) then
5330 if Nkind (P) = N_Package_Specification
5331 and then L = Visible_Declarations (P)
5332 and then Present (Private_Declarations (P))
5333 and then not Is_Empty_List (Private_Declarations (P))
5335 L := Private_Declarations (P);
5338 Insert_After (Last (L), F_Node);
5340 end Insert_After_Last_Decl;
5346 procedure Install_Body
5347 (Act_Body : Node_Id;
5352 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5353 Act_Unit : constant Node_Id :=
5354 Unit (Cunit (Get_Source_Unit (N)));
5356 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5357 Gen_Unit : constant Node_Id :=
5358 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5359 Orig_Body : Node_Id := Gen_Body;
5360 Par : constant Entity_Id := Scope (Gen_Id);
5361 Body_Unit : Node_Id;
5363 Must_Delay : Boolean;
5365 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5366 -- Find subprogram (if any) that encloses instance and/or generic body.
5368 function True_Sloc (N : Node_Id) return Source_Ptr;
5369 -- If the instance is nested inside a generic unit, the Sloc of the
5370 -- instance indicates the place of the original definition, not the
5371 -- point of the current enclosing instance. Pending a better usage of
5372 -- Slocs to indicate instantiation places, we determine the place of
5373 -- origin of a node by finding the maximum sloc of any ancestor node.
5374 -- Why is this not equivalent fo Top_Level_Location ???
5376 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5377 Scop : Entity_Id := Scope (Id);
5380 while Scop /= Standard_Standard
5381 and then not Is_Overloadable (Scop)
5383 Scop := Scope (Scop);
5389 function True_Sloc (N : Node_Id) return Source_Ptr is
5396 while Present (N1) and then N1 /= Act_Unit loop
5397 if Sloc (N1) > Res then
5407 -- Start of processing for Install_Body
5410 -- If the body is a subunit, the freeze point is the corresponding
5411 -- stub in the current compilation, not the subunit itself.
5413 if Nkind (Parent (Gen_Body)) = N_Subunit then
5414 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5416 Orig_Body := Gen_Body;
5419 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5421 -- If the instantiation and the generic definition appear in the
5422 -- same package declaration, this is an early instantiation.
5423 -- If they appear in the same declarative part, it is an early
5424 -- instantiation only if the generic body appears textually later,
5425 -- and the generic body is also in the main unit.
5427 -- If instance is nested within a subprogram, and the generic body is
5428 -- not, the instance is delayed because the enclosing body is. If
5429 -- instance and body are within the same scope, or the same sub-
5430 -- program body, indicate explicitly that the instance is delayed.
5433 (Gen_Unit = Act_Unit
5434 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5435 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5436 or else (Gen_Unit = Body_Unit
5437 and then True_Sloc (N) < Sloc (Orig_Body)))
5438 and then Is_In_Main_Unit (Gen_Unit)
5439 and then (Scope (Act_Id) = Scope (Gen_Id)
5441 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5443 -- If this is an early instantiation, the freeze node is placed after
5444 -- the generic body. Otherwise, if the generic appears in an instance,
5445 -- we cannot freeze the current instance until the outer one is frozen.
5446 -- This is only relevant if the current instance is nested within some
5447 -- inner scope not itself within the outer instance. If this scope is
5448 -- a package body in the same declarative part as the outer instance,
5449 -- then that body needs to be frozen after the outer instance. Finally,
5450 -- if no delay is needed, we place the freeze node at the end of the
5451 -- current declarative part.
5453 if Expander_Active then
5454 Ensure_Freeze_Node (Act_Id);
5455 F_Node := Freeze_Node (Act_Id);
5458 Insert_After (Orig_Body, F_Node);
5460 elsif Is_Generic_Instance (Par)
5461 and then Present (Freeze_Node (Par))
5462 and then Scope (Act_Id) /= Par
5464 -- Freeze instance of inner generic after instance of enclosing
5467 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5468 Insert_After (Freeze_Node (Par), F_Node);
5470 -- Freeze package enclosing instance of inner generic after
5471 -- instance of enclosing generic.
5473 elsif Nkind (Parent (N)) = N_Package_Body
5474 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5478 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5481 Insert_After_Last_Decl (N, F_Node);
5482 Ensure_Freeze_Node (Enclosing);
5484 if not Is_List_Member (Freeze_Node (Enclosing)) then
5485 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5490 Insert_After_Last_Decl (N, F_Node);
5494 Insert_After_Last_Decl (N, F_Node);
5498 Set_Is_Frozen (Act_Id);
5499 Insert_Before (N, Act_Body);
5500 Mark_Rewrite_Insertion (Act_Body);
5503 --------------------
5504 -- Install_Parent --
5505 --------------------
5507 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5508 S : Entity_Id := Current_Scope;
5509 Inst_Par : Entity_Id;
5510 First_Par : Entity_Id;
5511 Inst_Node : Node_Id;
5512 Gen_Par : Entity_Id;
5513 First_Gen : Entity_Id;
5514 Ancestors : Elist_Id := New_Elmt_List;
5517 procedure Install_Formal_Packages (Par : Entity_Id);
5518 -- If any of the formals of the parent are formal packages with box,
5519 -- their formal parts are visible in the parent and thus in the child
5520 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5521 -- for the unit itself.
5523 procedure Install_Noninstance_Specs (Par : Entity_Id);
5524 -- Install the scopes of noninstance parent units ending with Par.
5526 procedure Install_Spec (Par : Entity_Id);
5527 -- The child unit is within the declarative part of the parent, so
5528 -- the declarations within the parent are immediately visible.
5530 -----------------------------
5531 -- Install_Formal_Packages --
5532 -----------------------------
5534 procedure Install_Formal_Packages (Par : Entity_Id) is
5538 E := First_Entity (Par);
5540 while Present (E) loop
5542 if Ekind (E) = E_Package
5543 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5545 -- If this is the renaming for the parent instance, done.
5547 if Renamed_Object (E) = Par then
5550 -- The visibility of a formal of an enclosing generic is
5553 elsif Denotes_Formal_Package (E) then
5556 elsif Present (Associated_Formal_Package (E))
5557 and then Box_Present (Parent (Associated_Formal_Package (E)))
5559 Check_Generic_Actuals (Renamed_Object (E), True);
5560 Set_Is_Hidden (E, False);
5566 end Install_Formal_Packages;
5568 -------------------------------
5569 -- Install_Noninstance_Specs --
5570 -------------------------------
5572 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5575 and then Par /= Standard_Standard
5576 and then not In_Open_Scopes (Par)
5578 Install_Noninstance_Specs (Scope (Par));
5581 end Install_Noninstance_Specs;
5587 procedure Install_Spec (Par : Entity_Id) is
5588 Spec : constant Node_Id :=
5589 Specification (Unit_Declaration_Node (Par));
5593 Set_Is_Immediately_Visible (Par);
5594 Install_Visible_Declarations (Par);
5595 Install_Private_Declarations (Par);
5596 Set_Use (Visible_Declarations (Spec));
5597 Set_Use (Private_Declarations (Spec));
5600 -- Start of processing for Install_Parent
5603 -- We need to install the parent instance to compile the instantiation
5604 -- of the child, but the child instance must appear in the current
5605 -- scope. Given that we cannot place the parent above the current
5606 -- scope in the scope stack, we duplicate the current scope and unstack
5607 -- both after the instantiation is complete.
5609 -- If the parent is itself the instantiation of a child unit, we must
5610 -- also stack the instantiation of its parent, and so on. Each such
5611 -- ancestor is the prefix of the name in a prior instantiation.
5613 -- If this is a nested instance, the parent unit itself resolves to
5614 -- a renaming of the parent instance, whose declaration we need.
5616 -- Finally, the parent may be a generic (not an instance) when the
5617 -- child unit appears as a formal package.
5621 if Present (Renamed_Entity (Inst_Par)) then
5622 Inst_Par := Renamed_Entity (Inst_Par);
5625 First_Par := Inst_Par;
5628 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5630 First_Gen := Gen_Par;
5632 while Present (Gen_Par)
5633 and then Is_Child_Unit (Gen_Par)
5635 -- Load grandparent instance as well.
5637 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5639 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5640 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5642 if Present (Renamed_Entity (Inst_Par)) then
5643 Inst_Par := Renamed_Entity (Inst_Par);
5648 (Specification (Unit_Declaration_Node (Inst_Par)));
5650 if Present (Gen_Par) then
5651 Prepend_Elmt (Inst_Par, Ancestors);
5654 -- Parent is not the name of an instantiation.
5656 Install_Noninstance_Specs (Inst_Par);
5668 if Present (First_Gen) then
5669 Append_Elmt (First_Par, Ancestors);
5672 Install_Noninstance_Specs (First_Par);
5675 if not Is_Empty_Elmt_List (Ancestors) then
5676 Elmt := First_Elmt (Ancestors);
5678 while Present (Elmt) loop
5679 Install_Spec (Node (Elmt));
5680 Install_Formal_Packages (Node (Elmt));
5691 --------------------------------
5692 -- Instantiate_Formal_Package --
5693 --------------------------------
5695 function Instantiate_Formal_Package
5698 Analyzed_Formal : Node_Id)
5701 Loc : constant Source_Ptr := Sloc (Actual);
5702 Actual_Pack : Entity_Id;
5703 Formal_Pack : Entity_Id;
5704 Gen_Parent : Entity_Id;
5707 Parent_Spec : Node_Id;
5709 function Formal_Entity
5711 Act_Ent : Entity_Id)
5713 -- Returns the entity associated with the given formal F. In the
5714 -- case where F is a formal package, this function will iterate
5715 -- through all of F's formals and enter map associations from the
5716 -- actuals occurring in the formal package's corresponding actual
5717 -- package (obtained via Act_Ent) to the formal package's formal
5718 -- parameters. This function is called recursively for arbitrary
5719 -- levels of formal packages.
5721 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5722 -- Within the generic part, entities in the formal package are
5723 -- visible. To validate subsequent type declarations, indicate
5724 -- the correspondence betwen the entities in the analyzed formal,
5725 -- and the entities in the actual package. There are three packages
5726 -- involved in the instantiation of a formal package: the parent
5727 -- generic P1 which appears in the generic declaration, the fake
5728 -- instantiation P2 which appears in the analyzed generic, and whose
5729 -- visible entities may be used in subsequent formals, and the actual
5730 -- P3 in the instance. To validate subsequent formals, me indicate
5731 -- that the entities in P2 are mapped into those of P3. The mapping of
5732 -- entities has to be done recursively for nested packages.
5738 function Formal_Entity
5740 Act_Ent : Entity_Id)
5743 Orig_Node : Node_Id := F;
5747 when N_Formal_Object_Declaration =>
5748 return Defining_Identifier (F);
5750 when N_Formal_Type_Declaration =>
5751 return Defining_Identifier (F);
5753 when N_Formal_Subprogram_Declaration =>
5754 return Defining_Unit_Name (Specification (F));
5756 when N_Formal_Package_Declaration |
5757 N_Generic_Package_Declaration =>
5759 if Nkind (F) = N_Generic_Package_Declaration then
5760 Orig_Node := Original_Node (F);
5764 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5765 Formal_Node : Node_Id;
5766 Formal_Ent : Entity_Id;
5768 Gen_Decl : Node_Id :=
5769 Unit_Declaration_Node
5770 (Entity (Name (Orig_Node)));
5771 Formals : List_Id :=
5772 Generic_Formal_Declarations (Gen_Decl);
5775 if Present (Formals) then
5776 Formal_Node := First_Non_Pragma (Formals);
5778 Formal_Node := Empty;
5781 -- As for the loop further below, this loop is making
5782 -- a probably invalid assumption about the correspondence
5783 -- between formals and actuals and eventually needs to
5784 -- corrected to account for cases where the formals are
5785 -- not synchronized and in one-to-one correspondence
5786 -- with actuals. ???
5788 -- What is certain is that for a legal program the
5789 -- presence of actual entities guarantees the existing
5792 while Present (Actual_Ent)
5793 and then Present (Formal_Node)
5794 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5796 -- ??? Are the following calls also needed here:
5798 -- Set_Is_Hidden (Actual_Ent, False);
5799 -- Set_Is_Potentially_Use_Visible
5800 -- (Actual_Ent, In_Use (Act_Ent));
5802 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5803 if Present (Formal_Ent) then
5804 Set_Instance_Of (Formal_Ent, Actual_Ent);
5806 Next_Non_Pragma (Formal_Node);
5808 Next_Entity (Actual_Ent);
5812 return Defining_Identifier (Orig_Node);
5814 when N_Use_Package_Clause =>
5817 when N_Use_Type_Clause =>
5820 -- We return Empty for all other encountered forms of
5821 -- declarations because there are some cases of nonformal
5822 -- sorts of declaration that can show up (e.g., when array
5823 -- formals are present). Since it's not clear what kinds
5824 -- can appear among the formals, we won't raise failure here.
5836 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5841 Set_Instance_Of (Form, Act);
5843 E1 := First_Entity (Form);
5844 E2 := First_Entity (Act);
5846 and then E1 /= First_Private_Entity (Form)
5848 if not Is_Internal (E1)
5849 and then not Is_Class_Wide_Type (E1)
5853 and then Chars (E2) /= Chars (E1)
5861 Set_Instance_Of (E1, E2);
5864 and then Is_Tagged_Type (E2)
5867 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5870 if Ekind (E1) = E_Package
5871 and then No (Renamed_Object (E1))
5873 Map_Entities (E1, E2);
5882 -- Start of processing for Instantiate_Formal_Package
5887 if not Is_Entity_Name (Actual)
5888 or else Ekind (Entity (Actual)) /= E_Package
5891 ("expect package instance to instantiate formal", Actual);
5892 Abandon_Instantiation (Actual);
5893 raise Program_Error;
5896 Actual_Pack := Entity (Actual);
5897 Set_Is_Instantiated (Actual_Pack);
5899 -- The actual may be a renamed package, or an outer generic
5900 -- formal package whose instantiation is converted into a renaming.
5902 if Present (Renamed_Object (Actual_Pack)) then
5903 Actual_Pack := Renamed_Object (Actual_Pack);
5906 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5907 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5908 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5911 Generic_Parent (Specification (Analyzed_Formal));
5913 Defining_Unit_Name (Specification (Analyzed_Formal));
5916 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5917 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5919 Parent_Spec := Parent (Actual_Pack);
5922 if Gen_Parent = Any_Id then
5924 ("previous error in declaration of formal package", Actual);
5925 Abandon_Instantiation (Actual);
5928 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5931 ("actual parameter must be instance of&", Actual, Gen_Parent);
5932 Abandon_Instantiation (Actual);
5935 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5936 Map_Entities (Formal_Pack, Actual_Pack);
5939 Make_Package_Renaming_Declaration (Loc,
5940 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5941 Name => New_Reference_To (Actual_Pack, Loc));
5943 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5944 Defining_Identifier (Formal));
5945 Decls := New_List (Nod);
5947 -- If the formal F has a box, then the generic declarations are
5948 -- visible in the generic G. In an instance of G, the corresponding
5949 -- entities in the actual for F (which are the actuals for the
5950 -- instantiation of the generic that F denotes) must also be made
5951 -- visible for analysis of the current instance. On exit from the
5952 -- current instance, those entities are made private again. If the
5953 -- actual is currently in use, these entities are also use-visible.
5955 -- The loop through the actual entities also steps through the
5956 -- formal entities and enters associations from formals to
5957 -- actuals into the renaming map. This is necessary to properly
5958 -- handle checking of actual parameter associations for later
5959 -- formals that depend on actuals declared in the formal package.
5961 -- This processing needs to be reviewed at some point because
5962 -- it is probably not entirely correct as written. For example
5963 -- there may not be a strict one-to-one correspondence between
5964 -- actuals and formals and this loop is currently assuming that
5967 if Box_Present (Formal) then
5969 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
5970 Formal_Node : Node_Id := Empty;
5971 Formal_Ent : Entity_Id;
5972 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
5973 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
5976 if Present (Formals) then
5977 Formal_Node := First_Non_Pragma (Formals);
5980 while Present (Actual_Ent)
5981 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
5983 Set_Is_Hidden (Actual_Ent, False);
5984 Set_Is_Potentially_Use_Visible
5985 (Actual_Ent, In_Use (Actual_Pack));
5987 if Present (Formal_Node) then
5988 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5990 if Present (Formal_Ent) then
5991 Set_Instance_Of (Formal_Ent, Actual_Ent);
5994 Next_Non_Pragma (Formal_Node);
5997 Next_Entity (Actual_Ent);
6001 -- If the formal is not declared with a box, reanalyze it as
6002 -- an instantiation, to verify the matching rules of 12.7. The
6003 -- actual checks are performed after the generic associations
6008 I_Pack : constant Entity_Id :=
6009 Make_Defining_Identifier (Sloc (Actual),
6010 Chars => New_Internal_Name ('P'));
6013 Set_Is_Internal (I_Pack);
6016 Make_Package_Instantiation (Sloc (Actual),
6017 Defining_Unit_Name => I_Pack,
6018 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6019 Generic_Associations =>
6020 Generic_Associations (Formal)));
6027 end Instantiate_Formal_Package;
6029 -----------------------------------
6030 -- Instantiate_Formal_Subprogram --
6031 -----------------------------------
6033 function Instantiate_Formal_Subprogram
6036 Analyzed_Formal : Node_Id)
6039 Loc : Source_Ptr := Sloc (Instantiation_Node);
6040 Formal_Sub : constant Entity_Id :=
6041 Defining_Unit_Name (Specification (Formal));
6042 Analyzed_S : constant Entity_Id :=
6043 Defining_Unit_Name (Specification (Analyzed_Formal));
6044 Decl_Node : Node_Id;
6048 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6049 -- If the generic is a child unit, the parent has been installed
6050 -- on the scope stack, but a default subprogram cannot resolve to
6051 -- something on the parent because that parent is not really part
6052 -- of the visible context (it is there to resolve explicit local
6053 -- entities). If the default has resolved in this way, we remove
6054 -- the entity from immediate visibility and analyze the node again
6055 -- to emit an error message or find another visible candidate.
6057 procedure Valid_Actual_Subprogram (Act : Node_Id);
6058 -- Perform legality check and raise exception on failure.
6060 -----------------------
6061 -- From_Parent_Scope --
6062 -----------------------
6064 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6065 Gen_Scope : Node_Id := Scope (Analyzed_S);
6068 while Present (Gen_Scope)
6069 and then Is_Child_Unit (Gen_Scope)
6071 if Scope (Subp) = Scope (Gen_Scope) then
6075 Gen_Scope := Scope (Gen_Scope);
6079 end From_Parent_Scope;
6081 -----------------------------
6082 -- Valid_Actual_Subprogram --
6083 -----------------------------
6085 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6087 if not Is_Entity_Name (Act)
6088 and then Nkind (Act) /= N_Operator_Symbol
6089 and then Nkind (Act) /= N_Attribute_Reference
6090 and then Nkind (Act) /= N_Selected_Component
6091 and then Nkind (Act) /= N_Indexed_Component
6092 and then Nkind (Act) /= N_Character_Literal
6093 and then Nkind (Act) /= N_Explicit_Dereference
6095 if Etype (Act) /= Any_Type then
6097 ("Expect subprogram name to instantiate &",
6098 Instantiation_Node, Formal_Sub);
6101 -- In any case, instantiation cannot continue.
6103 Abandon_Instantiation (Instantiation_Node);
6105 end Valid_Actual_Subprogram;
6107 -- Start of processing for Instantiate_Formal_Subprogram
6110 New_Spec := New_Copy_Tree (Specification (Formal));
6112 -- Create new entity for the actual (New_Copy_Tree does not).
6114 Set_Defining_Unit_Name
6115 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6117 -- Find entity of actual. If the actual is an attribute reference, it
6118 -- cannot be resolved here (its formal is missing) but is handled
6119 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6120 -- fully resolved subsequently, when the renaming declaration for the
6121 -- formal is analyzed. If it is an explicit dereference, resolve the
6122 -- prefix but not the actual itself, to prevent interpretation as a
6125 if Present (Actual) then
6126 Loc := Sloc (Actual);
6127 Set_Sloc (New_Spec, Loc);
6129 if Nkind (Actual) = N_Operator_Symbol then
6130 Find_Direct_Name (Actual);
6132 elsif Nkind (Actual) = N_Explicit_Dereference then
6133 Analyze (Prefix (Actual));
6135 elsif Nkind (Actual) /= N_Attribute_Reference then
6139 Valid_Actual_Subprogram (Actual);
6142 elsif Present (Default_Name (Formal)) then
6144 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6145 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6146 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6147 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6148 and then Present (Entity (Default_Name (Formal)))
6150 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6152 Nam := New_Copy (Default_Name (Formal));
6153 Set_Sloc (Nam, Loc);
6156 elsif Box_Present (Formal) then
6158 -- Actual is resolved at the point of instantiation. Create
6159 -- an identifier or operator with the same name as the formal.
6161 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6162 Nam := Make_Operator_Symbol (Loc,
6163 Chars => Chars (Formal_Sub),
6164 Strval => No_String);
6166 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6171 ("missing actual for instantiation of &",
6172 Instantiation_Node, Formal_Sub);
6173 Abandon_Instantiation (Instantiation_Node);
6177 Make_Subprogram_Renaming_Declaration (Loc,
6178 Specification => New_Spec,
6181 -- Gather possible interpretations for the actual before analyzing the
6182 -- instance. If overloaded, it will be resolved when analyzing the
6183 -- renaming declaration.
6185 if Box_Present (Formal)
6186 and then No (Actual)
6190 if Is_Child_Unit (Scope (Analyzed_S))
6191 and then Present (Entity (Nam))
6193 if not Is_Overloaded (Nam) then
6195 if From_Parent_Scope (Entity (Nam)) then
6196 Set_Is_Immediately_Visible (Entity (Nam), False);
6197 Set_Entity (Nam, Empty);
6198 Set_Etype (Nam, Empty);
6202 Set_Is_Immediately_Visible (Entity (Nam));
6211 Get_First_Interp (Nam, I, It);
6213 while Present (It.Nam) loop
6214 if From_Parent_Scope (It.Nam) then
6218 Get_Next_Interp (I, It);
6225 -- The generic instantiation freezes the actual. This can only be
6226 -- done once the actual is resolved, in the analysis of the renaming
6227 -- declaration. To indicate that must be done, we set the corresponding
6228 -- spec of the node to point to the formal subprogram declaration.
6230 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6232 -- We cannot analyze the renaming declaration, and thus find the
6233 -- actual, until the all the actuals are assembled in the instance.
6234 -- For subsequent checks of other actuals, indicate the node that
6235 -- will hold the instance of this formal.
6237 Set_Instance_Of (Analyzed_S, Nam);
6239 if Nkind (Actual) = N_Selected_Component
6240 and then Is_Task_Type (Etype (Prefix (Actual)))
6241 and then not Is_Frozen (Etype (Prefix (Actual)))
6243 -- The renaming declaration will create a body, which must appear
6244 -- outside of the instantiation, We move the renaming declaration
6245 -- out of the instance, and create an additional renaming inside,
6246 -- to prevent freezing anomalies.
6249 Anon_Id : constant Entity_Id :=
6250 Make_Defining_Identifier
6251 (Loc, New_Internal_Name ('E'));
6253 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6254 Insert_Before (Instantiation_Node, Decl_Node);
6255 Analyze (Decl_Node);
6257 -- Now create renaming within the instance.
6260 Make_Subprogram_Renaming_Declaration (Loc,
6261 Specification => New_Copy_Tree (New_Spec),
6262 Name => New_Occurrence_Of (Anon_Id, Loc));
6264 Set_Defining_Unit_Name (Specification (Decl_Node),
6265 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6270 end Instantiate_Formal_Subprogram;
6272 ------------------------
6273 -- Instantiate_Object --
6274 ------------------------
6276 function Instantiate_Object
6279 Analyzed_Formal : Node_Id)
6282 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6283 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6284 Loc : constant Source_Ptr := Sloc (Actual);
6285 Act_Assoc : constant Node_Id := Parent (Actual);
6286 Orig_Ftyp : constant Entity_Id :=
6287 Etype (Defining_Identifier (Analyzed_Formal));
6289 Decl_Node : Node_Id;
6290 Subt_Decl : Node_Id := Empty;
6291 List : List_Id := New_List;
6294 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6295 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6298 Set_Parent (List, Parent (Actual));
6302 if Out_Present (Formal) then
6304 -- An IN OUT generic actual must be a name. The instantiation is
6305 -- a renaming declaration. The actual is the name being renamed.
6306 -- We use the actual directly, rather than a copy, because it is not
6307 -- used further in the list of actuals, and because a copy or a use
6308 -- of relocate_node is incorrect if the instance is nested within
6309 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6310 -- field links the declaration to the generic association.
6314 ("missing actual for instantiation of &",
6315 Instantiation_Node, Formal_Id);
6316 Abandon_Instantiation (Instantiation_Node);
6320 Make_Object_Renaming_Declaration (Loc,
6321 Defining_Identifier => New_Copy (Formal_Id),
6322 Subtype_Mark => New_Copy_Tree (Type_Id),
6325 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6327 -- The analysis of the actual may produce insert_action nodes, so
6328 -- the declaration must have a context in which to attach them.
6330 Append (Decl_Node, List);
6333 -- This check is performed here because Analyze_Object_Renaming
6334 -- will not check it when Comes_From_Source is False. Note
6335 -- though that the check for the actual being the name of an
6336 -- object will be performed in Analyze_Object_Renaming.
6338 if Is_Object_Reference (Actual)
6339 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6342 ("illegal discriminant-dependent component for in out parameter",
6346 -- The actual has to be resolved in order to check that it is
6347 -- a variable (due to cases such as F(1), where F returns
6348 -- access to an array, and for overloaded prefixes).
6351 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6353 if Is_Private_Type (Ftyp)
6354 and then not Is_Private_Type (Etype (Actual))
6355 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6356 or else Base_Type (Etype (Actual)) = Ftyp)
6358 -- If the actual has the type of the full view of the formal,
6359 -- or else a non-private subtype of the formal, then
6360 -- the visibility of the formal type has changed. Add to the
6361 -- actuals a subtype declaration that will force the exchange
6362 -- of views in the body of the instance as well.
6365 Make_Subtype_Declaration (Loc,
6366 Defining_Identifier =>
6367 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6368 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6370 Prepend (Subt_Decl, List);
6372 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6373 Exchange_Declarations (Ftyp);
6376 Resolve (Actual, Ftyp);
6378 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6380 ("actual for& must be a variable", Actual, Formal_Id);
6382 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6384 "type of actual does not match type of&", Actual, Formal_Id);
6388 Note_Possible_Modification (Actual);
6390 -- Check for instantiation of atomic/volatile actual for
6391 -- non-atomic/volatile formal (RM C.6 (12)).
6393 if Is_Atomic_Object (Actual)
6394 and then not Is_Atomic (Orig_Ftyp)
6397 ("cannot instantiate non-atomic formal object " &
6398 "with atomic actual", Actual);
6400 elsif Is_Volatile_Object (Actual)
6401 and then not Is_Volatile (Orig_Ftyp)
6404 ("cannot instantiate non-volatile formal object " &
6405 "with volatile actual", Actual);
6411 -- The instantiation of a generic formal in-parameter
6412 -- is a constant declaration. The actual is the expression for
6413 -- that declaration.
6415 if Present (Actual) then
6417 Decl_Node := Make_Object_Declaration (Loc,
6418 Defining_Identifier => New_Copy (Formal_Id),
6419 Constant_Present => True,
6420 Object_Definition => New_Copy_Tree (Type_Id),
6421 Expression => Actual);
6423 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6425 -- A generic formal object of a tagged type is defined
6426 -- to be aliased so the new constant must also be treated
6430 (Etype (Defining_Identifier (Analyzed_Formal)))
6432 Set_Aliased_Present (Decl_Node);
6435 Append (Decl_Node, List);
6441 (Etype (Defining_Identifier (Analyzed_Formal)));
6443 Freeze_Before (Instantiation_Node, Typ);
6445 -- If the actual is an aggregate, perform name resolution
6446 -- on its components (the analysis of an aggregate does not
6447 -- do it) to capture local names that may be hidden if the
6448 -- generic is a child unit.
6450 if Nkind (Actual) = N_Aggregate then
6451 Pre_Analyze_And_Resolve (Actual, Typ);
6455 elsif Present (Expression (Formal)) then
6457 -- Use default to construct declaration.
6460 Make_Object_Declaration (Sloc (Formal),
6461 Defining_Identifier => New_Copy (Formal_Id),
6462 Constant_Present => True,
6463 Object_Definition => New_Copy (Type_Id),
6464 Expression => New_Copy_Tree (Expression (Formal)));
6466 Append (Decl_Node, List);
6467 Set_Analyzed (Expression (Decl_Node), False);
6471 ("missing actual for instantiation of &",
6472 Instantiation_Node, Formal_Id);
6473 Abandon_Instantiation (Instantiation_Node);
6479 end Instantiate_Object;
6481 ------------------------------
6482 -- Instantiate_Package_Body --
6483 ------------------------------
6485 procedure Instantiate_Package_Body
6486 (Body_Info : Pending_Body_Info)
6488 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6489 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6490 Loc : constant Source_Ptr := Sloc (Inst_Node);
6492 Gen_Id : constant Node_Id := Name (Inst_Node);
6493 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6494 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6495 Act_Spec : constant Node_Id := Specification (Act_Decl);
6496 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6498 Act_Body_Name : Node_Id;
6500 Gen_Body_Id : Node_Id;
6502 Act_Body_Id : Entity_Id;
6504 Parent_Installed : Boolean := False;
6505 Save_Style_Check : Boolean := Style_Check;
6508 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6510 -- The instance body may already have been processed, as the parent
6511 -- of another instance that is inlined. (Load_Parent_Of_Generic).
6513 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
6517 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6519 if No (Gen_Body_Id) then
6520 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6521 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6524 -- Establish global variable for sloc adjustment and for error
6527 Instantiation_Node := Inst_Node;
6529 if Present (Gen_Body_Id) then
6530 Save_Env (Gen_Unit, Act_Decl_Id);
6531 Style_Check := False;
6532 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6534 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6536 Create_Instantiation_Source
6537 (Inst_Node, Gen_Body_Id, S_Adjustment);
6541 (Original_Node (Gen_Body), Empty, Instantiating => True);
6543 -- Build new name (possibly qualified) for body declaration.
6545 Act_Body_Id := New_Copy (Act_Decl_Id);
6547 -- Some attributes of the spec entity are not inherited by the
6550 Set_Handler_Records (Act_Body_Id, No_List);
6552 if Nkind (Defining_Unit_Name (Act_Spec)) =
6553 N_Defining_Program_Unit_Name
6556 Make_Defining_Program_Unit_Name (Loc,
6557 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6558 Defining_Identifier => Act_Body_Id);
6560 Act_Body_Name := Act_Body_Id;
6563 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6565 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6566 Check_Generic_Actuals (Act_Decl_Id, False);
6568 -- If it is a child unit, make the parent instance (which is an
6569 -- instance of the parent of the generic) visible. The parent
6570 -- instance is the prefix of the name of the generic unit.
6572 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6573 and then Nkind (Gen_Id) = N_Expanded_Name
6575 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6576 Parent_Installed := True;
6578 elsif Is_Child_Unit (Gen_Unit) then
6579 Install_Parent (Scope (Gen_Unit), In_Body => True);
6580 Parent_Installed := True;
6583 -- If the instantiation is a library unit, and this is the main
6584 -- unit, then build the resulting compilation unit nodes for the
6585 -- instance. If this is a compilation unit but it is not the main
6586 -- unit, then it is the body of a unit in the context, that is being
6587 -- compiled because it is encloses some inlined unit or another
6588 -- generic unit being instantiated. In that case, this body is not
6589 -- part of the current compilation, and is not attached to the tree,
6590 -- but its parent must be set for analysis.
6592 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6594 -- Replace instance node with body of instance, and create
6595 -- new node for corresponding instance declaration.
6597 Build_Instance_Compilation_Unit_Nodes
6598 (Inst_Node, Act_Body, Act_Decl);
6599 Analyze (Inst_Node);
6601 if Parent (Inst_Node) = Cunit (Main_Unit) then
6603 -- If the instance is a child unit itself, then set the
6604 -- scope of the expanded body to be the parent of the
6605 -- instantiation (ensuring that the fully qualified name
6606 -- will be generated for the elaboration subprogram).
6608 if Nkind (Defining_Unit_Name (Act_Spec)) =
6609 N_Defining_Program_Unit_Name
6612 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6616 -- Case where instantiation is not a library unit
6619 -- If this is an early instantiation, i.e. appears textually
6620 -- before the corresponding body and must be elaborated first,
6621 -- indicate that the body instance is to be delayed.
6623 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6625 -- Now analyze the body. We turn off all checks if this is
6626 -- an internal unit, since there is no reason to have checks
6627 -- on for any predefined run-time library code. All such
6628 -- code is designed to be compiled with checks off.
6630 -- Note that we do NOT apply this criterion to children of
6631 -- GNAT (or on VMS, children of DEC). The latter units must
6632 -- suppress checks explicitly if this is needed.
6634 if Is_Predefined_File_Name
6635 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6637 Analyze (Act_Body, Suppress => All_Checks);
6643 if not Generic_Separately_Compiled (Gen_Unit) then
6644 Inherit_Context (Gen_Body, Inst_Node);
6647 Restore_Private_Views (Act_Decl_Id);
6649 Style_Check := Save_Style_Check;
6651 -- If we have no body, and the unit requires a body, then complain.
6652 -- This complaint is suppressed if we have detected other errors
6653 -- (since a common reason for missing the body is that it had errors).
6655 elsif Unit_Requires_Body (Gen_Unit) then
6656 if Errors_Detected = 0 then
6658 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6660 -- Don't attempt to perform any cleanup actions if some other
6661 -- error was aready detected, since this can cause blowups.
6667 -- Case of package that does not need a body
6670 -- If the instantiation of the declaration is a library unit,
6671 -- rewrite the original package instantiation as a package
6672 -- declaration in the compilation unit node.
6674 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6675 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6676 Rewrite (Inst_Node, Act_Decl);
6678 -- If the instantiation is not a library unit, then append the
6679 -- declaration to the list of implicitly generated entities.
6680 -- unless it is already a list member which means that it was
6681 -- already processed
6683 elsif not Is_List_Member (Act_Decl) then
6684 Mark_Rewrite_Insertion (Act_Decl);
6685 Insert_Before (Inst_Node, Act_Decl);
6689 Expander_Mode_Restore;
6691 -- Remove the parent instances if they have been placed on the
6692 -- scope stack to compile the body.
6694 if Parent_Installed then
6695 Remove_Parent (In_Body => True);
6697 end Instantiate_Package_Body;
6699 ---------------------------------
6700 -- Instantiate_Subprogram_Body --
6701 ---------------------------------
6703 procedure Instantiate_Subprogram_Body
6704 (Body_Info : Pending_Body_Info)
6706 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6707 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6708 Loc : constant Source_Ptr := Sloc (Inst_Node);
6711 Gen_Id : constant Node_Id := Name (Inst_Node);
6712 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6713 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6714 Anon_Id : constant Entity_Id :=
6715 Defining_Unit_Name (Specification (Act_Decl));
6717 Gen_Body_Id : Node_Id;
6719 Act_Body_Id : Entity_Id;
6720 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6721 Pack_Body : Node_Id;
6722 Prev_Formal : Entity_Id;
6723 Unit_Renaming : Node_Id;
6725 Parent_Installed : Boolean := False;
6726 Save_Style_Check : Boolean := Style_Check;
6729 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6731 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6733 if No (Gen_Body_Id) then
6734 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6735 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6738 Instantiation_Node := Inst_Node;
6740 if Present (Gen_Body_Id) then
6741 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6743 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6745 -- Either body is not present, or context is non-expanding, as
6746 -- when compiling a subunit. Mark the instance as completed.
6748 Set_Has_Completion (Anon_Id);
6752 Save_Env (Gen_Unit, Anon_Id);
6753 Style_Check := False;
6754 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6755 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6759 (Original_Node (Gen_Body), Empty, Instantiating => True);
6760 Act_Body_Id := Defining_Entity (Act_Body);
6761 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6762 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6763 Set_Corresponding_Spec (Act_Body, Anon_Id);
6764 Set_Has_Completion (Anon_Id);
6765 Check_Generic_Actuals (Pack_Id, False);
6767 -- If it is a child unit, make the parent instance (which is an
6768 -- instance of the parent of the generic) visible. The parent
6769 -- instance is the prefix of the name of the generic unit.
6771 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6772 and then Nkind (Gen_Id) = N_Expanded_Name
6774 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6775 Parent_Installed := True;
6777 elsif Is_Child_Unit (Gen_Unit) then
6778 Install_Parent (Scope (Gen_Unit), In_Body => True);
6779 Parent_Installed := True;
6782 -- Inside its body, a reference to the generic unit is a reference
6783 -- to the instance. The corresponding renaming is the first
6784 -- declaration in the body.
6787 Make_Subprogram_Renaming_Declaration (Loc,
6790 Specification (Original_Node (Gen_Body)),
6792 Instantiating => True),
6793 Name => New_Occurrence_Of (Anon_Id, Loc));
6795 -- If there is a formal subprogram with the same name as the
6796 -- unit itself, do not add this renaming declaration. This is
6797 -- a temporary fix for one ACVC test. ???
6799 Prev_Formal := First_Entity (Pack_Id);
6800 while Present (Prev_Formal) loop
6801 if Chars (Prev_Formal) = Chars (Gen_Unit)
6802 and then Is_Overloadable (Prev_Formal)
6807 Next_Entity (Prev_Formal);
6810 if Present (Prev_Formal) then
6811 Decls := New_List (Act_Body);
6813 Decls := New_List (Unit_Renaming, Act_Body);
6816 -- The subprogram body is placed in the body of a dummy package
6817 -- body, whose spec contains the subprogram declaration as well
6818 -- as the renaming declarations for the generic parameters.
6820 Pack_Body := Make_Package_Body (Loc,
6821 Defining_Unit_Name => New_Copy (Pack_Id),
6822 Declarations => Decls);
6824 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6826 -- If the instantiation is a library unit, then build resulting
6827 -- compilation unit nodes for the instance. The declaration of
6828 -- the enclosing package is the grandparent of the subprogram
6829 -- declaration. First replace the instantiation node as the unit
6830 -- of the corresponding compilation.
6832 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6834 if Parent (Inst_Node) = Cunit (Main_Unit) then
6835 Set_Unit (Parent (Inst_Node), Inst_Node);
6836 Build_Instance_Compilation_Unit_Nodes
6837 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6838 Analyze (Inst_Node);
6840 Set_Parent (Pack_Body, Parent (Inst_Node));
6841 Analyze (Pack_Body);
6845 Insert_Before (Inst_Node, Pack_Body);
6846 Mark_Rewrite_Insertion (Pack_Body);
6847 Analyze (Pack_Body);
6849 if Expander_Active then
6850 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6854 if not Generic_Separately_Compiled (Gen_Unit) then
6855 Inherit_Context (Gen_Body, Inst_Node);
6858 Restore_Private_Views (Pack_Id, False);
6860 if Parent_Installed then
6861 Remove_Parent (In_Body => True);
6865 Style_Check := Save_Style_Check;
6867 -- Body not found. Error was emitted already. If there were no
6868 -- previous errors, this may be an instance whose scope is a premature
6869 -- instance. In that case we must insure that the (legal) program does
6870 -- raise program error if executed. We generate a subprogram body for
6871 -- this purpose. See DEC ac30vso.
6873 elsif Errors_Detected = 0
6874 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6876 if Ekind (Anon_Id) = E_Procedure then
6878 Make_Subprogram_Body (Loc,
6880 Make_Procedure_Specification (Loc,
6881 Defining_Unit_Name => New_Copy (Anon_Id),
6882 Parameter_Specifications =>
6884 (Parameter_Specifications (Parent (Anon_Id)))),
6886 Declarations => Empty_List,
6887 Handled_Statement_Sequence =>
6888 Make_Handled_Sequence_Of_Statements (Loc,
6890 New_List (Make_Raise_Program_Error (Loc))));
6893 Make_Subprogram_Body (Loc,
6895 Make_Function_Specification (Loc,
6896 Defining_Unit_Name => New_Copy (Anon_Id),
6897 Parameter_Specifications =>
6899 (Parameter_Specifications (Parent (Anon_Id))),
6901 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6903 Declarations => Empty_List,
6904 Handled_Statement_Sequence =>
6905 Make_Handled_Sequence_Of_Statements (Loc,
6906 Statements => New_List (
6907 Make_Return_Statement (Loc,
6908 Expression => Make_Raise_Program_Error (Loc)))));
6911 Pack_Body := Make_Package_Body (Loc,
6912 Defining_Unit_Name => New_Copy (Pack_Id),
6913 Declarations => New_List (Act_Body));
6915 Insert_After (Inst_Node, Pack_Body);
6916 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6917 Analyze (Pack_Body);
6920 Expander_Mode_Restore;
6921 end Instantiate_Subprogram_Body;
6923 ----------------------
6924 -- Instantiate_Type --
6925 ----------------------
6927 function Instantiate_Type
6930 Analyzed_Formal : Node_Id)
6933 Loc : constant Source_Ptr := Sloc (Actual);
6934 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6935 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6936 Ancestor : Entity_Id;
6937 Def : constant Node_Id := Formal_Type_Definition (Formal);
6939 Decl_Node : Node_Id;
6941 procedure Validate_Array_Type_Instance;
6942 procedure Validate_Access_Subprogram_Instance;
6943 procedure Validate_Access_Type_Instance;
6944 procedure Validate_Derived_Type_Instance;
6945 procedure Validate_Private_Type_Instance;
6946 -- These procedures perform validation tests for the named case
6948 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6949 -- Check that base types are the same and that the subtypes match
6950 -- statically. Used in several of the above.
6952 --------------------
6953 -- Subtypes_Match --
6954 --------------------
6956 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
6957 T : constant Entity_Id := Get_Instance_Of (Gen_T);
6960 return (Base_Type (T) = Base_Type (Act_T)
6961 -- why is the and then commented out here???
6962 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
6963 and then Subtypes_Statically_Match (T, Act_T))
6965 or else (Is_Class_Wide_Type (Gen_T)
6966 and then Is_Class_Wide_Type (Act_T)
6969 Get_Instance_Of (Root_Type (Gen_T)),
6970 Root_Type (Act_T)));
6973 -----------------------------------------
6974 -- Validate_Access_Subprogram_Instance --
6975 -----------------------------------------
6977 procedure Validate_Access_Subprogram_Instance is
6979 if not Is_Access_Type (Act_T)
6980 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
6983 ("expect access type in instantiation of &", Actual, Gen_T);
6984 Abandon_Instantiation (Actual);
6987 Check_Mode_Conformant
6988 (Designated_Type (Act_T),
6989 Designated_Type (A_Gen_T),
6993 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
6994 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
6996 ("protected access type not allowed for formal &",
7000 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7002 ("expect protected access type for formal &",
7005 end Validate_Access_Subprogram_Instance;
7007 -----------------------------------
7008 -- Validate_Access_Type_Instance --
7009 -----------------------------------
7011 procedure Validate_Access_Type_Instance is
7012 Desig_Type : Entity_Id :=
7013 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7016 if not Is_Access_Type (Act_T) then
7018 ("expect access type in instantiation of &", Actual, Gen_T);
7019 Abandon_Instantiation (Actual);
7022 if Is_Access_Constant (A_Gen_T) then
7023 if not Is_Access_Constant (Act_T) then
7025 ("actual type must be access-to-constant type", Actual);
7026 Abandon_Instantiation (Actual);
7029 if Is_Access_Constant (Act_T) then
7031 ("actual type must be access-to-variable type", Actual);
7032 Abandon_Instantiation (Actual);
7034 elsif Ekind (A_Gen_T) = E_General_Access_Type
7035 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7037 Error_Msg_N ("actual must be general access type!", Actual);
7038 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7039 Abandon_Instantiation (Actual);
7043 -- The designated subtypes, that is to say the subtypes introduced
7044 -- by an access type declaration (and not by a subtype declaration)
7047 if not Subtypes_Match
7048 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7051 ("designated type of actual does not match that of formal &",
7053 Abandon_Instantiation (Actual);
7055 elsif Is_Access_Type (Designated_Type (Act_T))
7056 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7058 Is_Constrained (Designated_Type (Desig_Type))
7061 ("designated type of actual does not match that of formal &",
7063 Abandon_Instantiation (Actual);
7065 end Validate_Access_Type_Instance;
7067 ----------------------------------
7068 -- Validate_Array_Type_Instance --
7069 ----------------------------------
7071 procedure Validate_Array_Type_Instance is
7076 function Formal_Dimensions return Int;
7077 -- Count number of dimensions in array type formal
7079 function Formal_Dimensions return Int is
7084 if Nkind (Def) = N_Constrained_Array_Definition then
7085 Index := First (Discrete_Subtype_Definitions (Def));
7087 Index := First (Subtype_Marks (Def));
7090 while Present (Index) loop
7096 end Formal_Dimensions;
7098 -- Start of processing for Validate_Array_Type_Instance
7101 if not Is_Array_Type (Act_T) then
7103 ("expect array type in instantiation of &", Actual, Gen_T);
7104 Abandon_Instantiation (Actual);
7106 elsif Nkind (Def) = N_Constrained_Array_Definition then
7107 if not (Is_Constrained (Act_T)) then
7109 ("expect constrained array in instantiation of &",
7111 Abandon_Instantiation (Actual);
7115 if Is_Constrained (Act_T) then
7117 ("expect unconstrained array in instantiation of &",
7119 Abandon_Instantiation (Actual);
7123 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7125 ("dimensions of actual do not match formal &", Actual, Gen_T);
7126 Abandon_Instantiation (Actual);
7129 I1 := First_Index (A_Gen_T);
7130 I2 := First_Index (Act_T);
7131 for J in 1 .. Formal_Dimensions loop
7133 -- If the indices of the actual were given by a subtype_mark,
7134 -- the index was transformed into a range attribute. Retrieve
7135 -- the original type mark for checking.
7137 if Is_Entity_Name (Original_Node (I2)) then
7138 T2 := Entity (Original_Node (I2));
7143 if not Subtypes_Match
7144 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7147 ("index types of actual do not match those of formal &",
7149 Abandon_Instantiation (Actual);
7156 if not Subtypes_Match (
7157 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7158 Component_Type (Act_T))
7161 ("component subtype of actual does not match that of formal &",
7163 Abandon_Instantiation (Actual);
7166 if Has_Aliased_Components (A_Gen_T)
7167 and then not Has_Aliased_Components (Act_T)
7170 ("actual must have aliased components to match formal type &",
7174 end Validate_Array_Type_Instance;
7176 ------------------------------------
7177 -- Validate_Derived_Type_Instance --
7178 ------------------------------------
7180 procedure Validate_Derived_Type_Instance is
7181 Actual_Discr : Entity_Id;
7182 Ancestor_Discr : Entity_Id;
7185 -- If the parent type in the generic declaration is itself
7186 -- a previous formal type, then it is local to the generic
7187 -- and absent from the analyzed generic definition. In that
7188 -- case the ancestor is the instance of the formal (which must
7189 -- have been instantiated previously). Otherwise, the analyzed
7190 -- generic carries the parent type. If the parent type is defined
7191 -- in a previous formal package, then the scope of that formal
7192 -- package is that of the generic type itself, and it has already
7193 -- been mapped into the corresponding type in the actual package.
7195 -- Common case: parent type defined outside of the generic.
7197 if Is_Entity_Name (Subtype_Mark (Def))
7198 and then Present (Entity (Subtype_Mark (Def)))
7200 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7202 -- Check whether parent is defined in a previous formal package.
7205 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7208 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7210 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) then
7212 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7215 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7218 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7220 ("expect type derived from & in instantiation",
7221 Actual, First_Subtype (Ancestor));
7222 Abandon_Instantiation (Actual);
7225 -- Perform atomic/volatile checks (RM C.6(12))
7227 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7229 ("cannot have atomic actual type for non-atomic formal type",
7232 elsif Is_Volatile (Act_T)
7233 and then not Is_Volatile (Ancestor)
7234 and then Is_By_Reference_Type (Ancestor)
7237 ("cannot have volatile actual type for non-volatile formal type",
7241 -- It should not be necessary to check for unknown discriminants
7242 -- on Formal, but for some reason Has_Unknown_Discriminants is
7243 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7244 -- returns False. This needs fixing. ???
7246 if not Is_Indefinite_Subtype (A_Gen_T)
7247 and then not Unknown_Discriminants_Present (Formal)
7248 and then Is_Indefinite_Subtype (Act_T)
7251 ("actual subtype must be constrained", Actual);
7252 Abandon_Instantiation (Actual);
7255 if not Unknown_Discriminants_Present (Formal) then
7256 if Is_Constrained (Ancestor) then
7257 if not Is_Constrained (Act_T) then
7259 ("actual subtype must be constrained", Actual);
7260 Abandon_Instantiation (Actual);
7263 -- Ancestor is unconstrained
7265 elsif Is_Constrained (Act_T) then
7266 if Ekind (Ancestor) = E_Access_Type
7267 or else Is_Composite_Type (Ancestor)
7270 ("actual subtype must be unconstrained", Actual);
7271 Abandon_Instantiation (Actual);
7274 -- A class-wide type is only allowed if the formal has
7275 -- unknown discriminants.
7277 elsif Is_Class_Wide_Type (Act_T)
7278 and then not Has_Unknown_Discriminants (Ancestor)
7281 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7282 Abandon_Instantiation (Actual);
7284 -- Otherwise, the formal and actual shall have the same
7285 -- number of discriminants and each discriminant of the
7286 -- actual must correspond to a discriminant of the formal.
7288 elsif Has_Discriminants (Act_T)
7289 and then Has_Discriminants (Ancestor)
7291 Actual_Discr := First_Discriminant (Act_T);
7292 Ancestor_Discr := First_Discriminant (Ancestor);
7293 while Present (Actual_Discr)
7294 and then Present (Ancestor_Discr)
7296 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7297 not Present (Corresponding_Discriminant (Actual_Discr))
7300 ("discriminant & does not correspond " &
7301 "to ancestor discriminant", Actual, Actual_Discr);
7302 Abandon_Instantiation (Actual);
7305 Next_Discriminant (Actual_Discr);
7306 Next_Discriminant (Ancestor_Discr);
7309 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7311 ("actual for & must have same number of discriminants",
7313 Abandon_Instantiation (Actual);
7316 -- This case should be caught by the earlier check for
7317 -- for constrainedness, but the check here is added for
7320 elsif Has_Discriminants (Act_T) then
7322 ("actual for & must not have discriminants", Actual, Gen_T);
7323 Abandon_Instantiation (Actual);
7325 elsif Has_Discriminants (Ancestor) then
7327 ("actual for & must have known discriminants", Actual, Gen_T);
7328 Abandon_Instantiation (Actual);
7331 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7333 ("constraint on actual is incompatible with formal", Actual);
7334 Abandon_Instantiation (Actual);
7338 end Validate_Derived_Type_Instance;
7340 ------------------------------------
7341 -- Validate_Private_Type_Instance --
7342 ------------------------------------
7344 procedure Validate_Private_Type_Instance is
7345 Formal_Discr : Entity_Id;
7346 Actual_Discr : Entity_Id;
7347 Formal_Subt : Entity_Id;
7350 if (Is_Limited_Type (Act_T)
7351 or else Is_Limited_Composite (Act_T))
7352 and then not Is_Limited_Type (A_Gen_T)
7355 ("actual for non-limited & cannot be a limited type", Actual,
7357 Abandon_Instantiation (Actual);
7359 elsif Is_Indefinite_Subtype (Act_T)
7360 and then not Is_Indefinite_Subtype (A_Gen_T)
7364 ("actual for & must be a definite subtype", Actual, Gen_T);
7366 elsif not Is_Tagged_Type (Act_T)
7367 and then Is_Tagged_Type (A_Gen_T)
7370 ("actual for & must be a tagged type", Actual, Gen_T);
7372 elsif Has_Discriminants (A_Gen_T) then
7373 if not Has_Discriminants (Act_T) then
7375 ("actual for & must have discriminants", Actual, Gen_T);
7376 Abandon_Instantiation (Actual);
7378 elsif Is_Constrained (Act_T) then
7380 ("actual for & must be unconstrained", Actual, Gen_T);
7381 Abandon_Instantiation (Actual);
7384 Formal_Discr := First_Discriminant (A_Gen_T);
7385 Actual_Discr := First_Discriminant (Act_T);
7386 while Formal_Discr /= Empty loop
7387 if Actual_Discr = Empty then
7389 ("discriminants on actual do not match formal",
7391 Abandon_Instantiation (Actual);
7394 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7396 -- access discriminants match if designated types do.
7398 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7399 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7400 = E_Anonymous_Access_Type
7401 and then Get_Instance_Of (
7402 Designated_Type (Base_Type (Formal_Subt)))
7403 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7407 elsif Base_Type (Formal_Subt) /=
7408 Base_Type (Etype (Actual_Discr))
7411 ("types of actual discriminants must match formal",
7413 Abandon_Instantiation (Actual);
7415 elsif not Subtypes_Statically_Match
7416 (Formal_Subt, Etype (Actual_Discr))
7420 ("subtypes of actual discriminants must match formal",
7422 Abandon_Instantiation (Actual);
7425 Next_Discriminant (Formal_Discr);
7426 Next_Discriminant (Actual_Discr);
7429 if Actual_Discr /= Empty then
7431 ("discriminants on actual do not match formal",
7433 Abandon_Instantiation (Actual);
7440 end Validate_Private_Type_Instance;
7442 -- Start of processing for Instantiate_Type
7445 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7446 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7449 elsif not Is_Entity_Name (Actual)
7450 or else not Is_Type (Entity (Actual))
7453 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7454 Abandon_Instantiation (Actual);
7457 Act_T := Entity (Actual);
7459 if Ekind (Act_T) = E_Incomplete_Type then
7460 if No (Underlying_Type (Act_T)) then
7461 Error_Msg_N ("premature use of incomplete type", Actual);
7462 Abandon_Instantiation (Actual);
7464 Act_T := Full_View (Act_T);
7465 Set_Entity (Actual, Act_T);
7467 if Has_Private_Component (Act_T) then
7469 ("premature use of type with private component", Actual);
7473 elsif Is_Private_Type (Act_T)
7474 and then Is_Private_Type (Base_Type (Act_T))
7475 and then not Is_Generic_Type (Act_T)
7476 and then not Is_Derived_Type (Act_T)
7477 and then No (Full_View (Root_Type (Act_T)))
7479 Error_Msg_N ("premature use of private type", Actual);
7481 elsif Has_Private_Component (Act_T) then
7483 ("premature use of type with private component", Actual);
7486 Set_Instance_Of (A_Gen_T, Act_T);
7488 -- If the type is generic, the class-wide type may also be used
7490 if Is_Tagged_Type (A_Gen_T)
7491 and then Is_Tagged_Type (Act_T)
7492 and then not Is_Class_Wide_Type (A_Gen_T)
7494 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7495 Class_Wide_Type (Act_T));
7498 if not Is_Abstract (A_Gen_T)
7499 and then Is_Abstract (Act_T)
7502 ("actual of non-abstract formal cannot be abstract", Actual);
7505 if Is_Scalar_Type (Gen_T) then
7506 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7511 when N_Formal_Private_Type_Definition =>
7512 Validate_Private_Type_Instance;
7514 when N_Formal_Derived_Type_Definition =>
7515 Validate_Derived_Type_Instance;
7517 when N_Formal_Discrete_Type_Definition =>
7518 if not Is_Discrete_Type (Act_T) then
7520 ("expect discrete type in instantiation of&", Actual, Gen_T);
7521 Abandon_Instantiation (Actual);
7524 when N_Formal_Signed_Integer_Type_Definition =>
7525 if not Is_Signed_Integer_Type (Act_T) then
7527 ("expect signed integer type in instantiation of&",
7529 Abandon_Instantiation (Actual);
7532 when N_Formal_Modular_Type_Definition =>
7533 if not Is_Modular_Integer_Type (Act_T) then
7535 ("expect modular type in instantiation of &", Actual, Gen_T);
7536 Abandon_Instantiation (Actual);
7539 when N_Formal_Floating_Point_Definition =>
7540 if not Is_Floating_Point_Type (Act_T) then
7542 ("expect float type in instantiation of &", Actual, Gen_T);
7543 Abandon_Instantiation (Actual);
7546 when N_Formal_Ordinary_Fixed_Point_Definition =>
7547 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7549 ("expect ordinary fixed point type in instantiation of &",
7551 Abandon_Instantiation (Actual);
7554 when N_Formal_Decimal_Fixed_Point_Definition =>
7555 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7557 ("expect decimal type in instantiation of &",
7559 Abandon_Instantiation (Actual);
7562 when N_Array_Type_Definition =>
7563 Validate_Array_Type_Instance;
7565 when N_Access_To_Object_Definition =>
7566 Validate_Access_Type_Instance;
7568 when N_Access_Function_Definition |
7569 N_Access_Procedure_Definition =>
7570 Validate_Access_Subprogram_Instance;
7573 raise Program_Error;
7578 Make_Subtype_Declaration (Loc,
7579 Defining_Identifier => New_Copy (Gen_T),
7580 Subtype_Indication => New_Reference_To (Act_T, Loc));
7582 if Is_Private_Type (Act_T) then
7583 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7586 -- Flag actual derived types so their elaboration produces the
7587 -- appropriate renamings for the primitive operations of the ancestor.
7588 -- Flag actual for formal private types as well, to determine whether
7589 -- operations in the private part may override inherited operations.
7591 if Nkind (Def) = N_Formal_Derived_Type_Definition
7592 or else Nkind (Def) = N_Formal_Private_Type_Definition
7594 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7598 end Instantiate_Type;
7600 ---------------------
7601 -- Is_In_Main_Unit --
7602 ---------------------
7604 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7605 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7607 Current_Unit : Node_Id;
7610 if Unum = Main_Unit then
7613 -- If the current unit is a subunit then it is either the main unit
7614 -- or is being compiled as part of the main unit.
7616 elsif Nkind (N) = N_Compilation_Unit then
7617 return Nkind (Unit (N)) = N_Subunit;
7620 Current_Unit := Parent (N);
7621 while Present (Current_Unit)
7622 and then Nkind (Current_Unit) /= N_Compilation_Unit
7624 Current_Unit := Parent (Current_Unit);
7627 -- The instantiation node is in the main unit, or else the current
7628 -- node (perhaps as the result of nested instantiations) is in the
7629 -- main unit, or in the declaration of the main unit, which in this
7630 -- last case must be a body.
7632 return Unum = Main_Unit
7633 or else Current_Unit = Cunit (Main_Unit)
7634 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7635 or else (Present (Library_Unit (Current_Unit))
7636 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7637 end Is_In_Main_Unit;
7639 ----------------------------
7640 -- Load_Parent_Of_Generic --
7641 ----------------------------
7643 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7644 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7645 True_Parent : Node_Id;
7646 Inst_Node : Node_Id;
7648 Save_Style_Check : Boolean := Style_Check;
7651 if not In_Same_Source_Unit (N, Spec)
7652 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7653 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7654 and then not Is_In_Main_Unit (Spec))
7656 -- Find body of parent of spec, and analyze it. A special case
7657 -- arises when the parent is an instantiation, that is to say when
7658 -- we are currently instantiating a nested generic. In that case,
7659 -- there is no separate file for the body of the enclosing instance.
7660 -- Instead, the enclosing body must be instantiated as if it were
7661 -- a pending instantiation, in order to produce the body for the
7662 -- nested generic we require now. Note that in that case the
7663 -- generic may be defined in a package body, the instance defined
7664 -- in the same package body, and the original enclosing body may not
7665 -- be in the main unit.
7667 True_Parent := Parent (Spec);
7670 while Present (True_Parent)
7671 and then Nkind (True_Parent) /= N_Compilation_Unit
7673 if Nkind (True_Parent) = N_Package_Declaration
7675 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7677 -- Parent is a compilation unit that is an instantiation.
7678 -- Instantiation node has been replaced with package decl.
7680 Inst_Node := Original_Node (True_Parent);
7683 elsif Nkind (True_Parent) = N_Package_Declaration
7684 and then Present (Generic_Parent (Specification (True_Parent)))
7686 -- Parent is an instantiation within another specification.
7687 -- Declaration for instance has been inserted before original
7688 -- instantiation node. A direct link would be preferable?
7690 Inst_Node := Next (True_Parent);
7692 while Present (Inst_Node)
7693 and then Nkind (Inst_Node) /= N_Package_Instantiation
7698 -- If the instance appears within a generic, and the generic
7699 -- unit is defined within a formal package of the enclosing
7700 -- generic, there is no generic body available, and none
7701 -- needed. A more precise test should be used ???
7703 if No (Inst_Node) then
7709 True_Parent := Parent (True_Parent);
7713 if Present (Inst_Node) then
7715 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7717 -- Instantiation node and declaration of instantiated package
7718 -- were exchanged when only the declaration was needed.
7719 -- Restore instantiation node before proceeding with body.
7721 Set_Unit (Parent (True_Parent), Inst_Node);
7724 -- Now complete instantiation of enclosing body, if it appears
7725 -- in some other unit. If it appears in the current unit, the
7726 -- body will have been instantiated already.
7728 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7729 Instantiate_Package_Body
7730 (Pending_Body_Info'(
7731 Inst_Node, True_Parent, Expander_Active,
7732 Get_Code_Unit (Sloc (Inst_Node))));
7736 Opt.Style_Check := False;
7737 Load_Needed_Body (Comp_Unit, OK);
7738 Opt.Style_Check := Save_Style_Check;
7741 and then Unit_Requires_Body (Defining_Entity (Spec))
7744 Bname : constant Unit_Name_Type :=
7745 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7748 Error_Msg_Unit_1 := Bname;
7749 Error_Msg_N ("this instantiation requires$!", N);
7751 Get_File_Name (Bname, Subunit => False);
7752 Error_Msg_N ("\but file{ was not found!", N);
7753 raise Unrecoverable_Error;
7759 -- If loading the parent of the generic caused an instantiation
7760 -- circularity, we abandon compilation at this point, because
7761 -- otherwise in some cases we get into trouble with infinite
7762 -- recursions after this point.
7764 if Circularity_Detected then
7765 raise Unrecoverable_Error;
7768 end Load_Parent_Of_Generic;
7770 -----------------------
7771 -- Move_Freeze_Nodes --
7772 -----------------------
7774 procedure Move_Freeze_Nodes
7775 (Out_Of : Entity_Id;
7780 Next_Decl : Node_Id;
7781 Next_Node : Node_Id := After;
7784 function Is_Outer_Type (T : Entity_Id) return Boolean;
7785 -- Check whether entity is declared in a scope external to that
7786 -- of the generic unit.
7792 function Is_Outer_Type (T : Entity_Id) return Boolean is
7793 Scop : Entity_Id := Scope (T);
7796 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7800 while Scop /= Standard_Standard loop
7802 if Scop = Out_Of then
7805 Scop := Scope (Scop);
7813 -- Start of processing for Move_Freeze_Nodes
7820 -- First remove the freeze nodes that may appear before all other
7824 while Present (Decl)
7825 and then Nkind (Decl) = N_Freeze_Entity
7826 and then Is_Outer_Type (Entity (Decl))
7828 Decl := Remove_Head (L);
7829 Insert_After (Next_Node, Decl);
7830 Set_Analyzed (Decl, False);
7835 -- Next scan the list of declarations and remove each freeze node that
7836 -- appears ahead of the current node.
7838 while Present (Decl) loop
7839 while Present (Next (Decl))
7840 and then Nkind (Next (Decl)) = N_Freeze_Entity
7841 and then Is_Outer_Type (Entity (Next (Decl)))
7843 Next_Decl := Remove_Next (Decl);
7844 Insert_After (Next_Node, Next_Decl);
7845 Set_Analyzed (Next_Decl, False);
7846 Next_Node := Next_Decl;
7849 -- If the declaration is a nested package or concurrent type, then
7850 -- recurse. Nested generic packages will have been processed from the
7853 if Nkind (Decl) = N_Package_Declaration then
7854 Spec := Specification (Decl);
7856 elsif Nkind (Decl) = N_Task_Type_Declaration then
7857 Spec := Task_Definition (Decl);
7859 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7860 Spec := Protected_Definition (Decl);
7866 if Present (Spec) then
7867 Move_Freeze_Nodes (Out_Of, Next_Node,
7868 Visible_Declarations (Spec));
7869 Move_Freeze_Nodes (Out_Of, Next_Node,
7870 Private_Declarations (Spec));
7875 end Move_Freeze_Nodes;
7881 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7883 return Generic_Renamings.Table (E).Next_In_HTable;
7886 ------------------------
7887 -- Preanalyze_Actuals --
7888 ------------------------
7890 procedure Pre_Analyze_Actuals (N : Node_Id) is
7893 Errs : Int := Errors_Detected;
7896 Assoc := First (Generic_Associations (N));
7898 while Present (Assoc) loop
7899 Act := Explicit_Generic_Actual_Parameter (Assoc);
7901 -- Within a nested instantiation, a defaulted actual is an
7902 -- empty association, so nothing to analyze. If the actual for
7903 -- a subprogram is an attribute, analyze prefix only, because
7904 -- actual is not a complete attribute reference.
7905 -- String literals may be operators, but at this point we do not
7906 -- know whether the actual is a formal subprogram or a string.
7911 elsif Nkind (Act) = N_Attribute_Reference then
7912 Analyze (Prefix (Act));
7914 elsif Nkind (Act) = N_Explicit_Dereference then
7915 Analyze (Prefix (Act));
7917 elsif Nkind (Act) /= N_Operator_Symbol then
7921 if Errs /= Errors_Detected then
7922 Abandon_Instantiation (Act);
7927 end Pre_Analyze_Actuals;
7933 procedure Remove_Parent (In_Body : Boolean := False) is
7934 S : Entity_Id := Current_Scope;
7940 -- After child instantiation is complete, remove from scope stack
7941 -- the extra copy of the current scope, and then remove parent
7947 while Current_Scope /= S loop
7949 End_Package_Scope (Current_Scope);
7951 if In_Open_Scopes (P) then
7952 E := First_Entity (P);
7954 while Present (E) loop
7955 Set_Is_Immediately_Visible (E, True);
7959 elsif not In_Open_Scopes (Scope (P)) then
7960 Set_Is_Immediately_Visible (P, False);
7964 -- Reset visibility of entities in the enclosing scope.
7966 Set_Is_Hidden_Open_Scope (Current_Scope, False);
7967 Hidden := First_Elmt (Hidden_Entities);
7969 while Present (Hidden) loop
7970 Set_Is_Immediately_Visible (Node (Hidden), True);
7975 -- Each body is analyzed separately, and there is no context
7976 -- that needs preserving from one body instance to the next,
7977 -- so remove all parent scopes that have been installed.
7979 while Present (S) loop
7980 End_Package_Scope (S);
7982 exit when S = Standard_Standard;
7992 procedure Restore_Env is
7993 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
7996 Ada_83 := Saved.Ada_83;
7998 if No (Current_Instantiated_Parent.Act_Id) then
8000 -- Restore environment after subprogram inlining
8002 Restore_Private_Views (Empty);
8005 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8006 Exchanged_Views := Saved.Exchanged_Views;
8007 Hidden_Entities := Saved.Hidden_Entities;
8008 Current_Sem_Unit := Saved.Current_Sem_Unit;
8010 Instance_Envs.Decrement_Last;
8013 ---------------------------
8014 -- Restore_Private_Views --
8015 ---------------------------
8017 procedure Restore_Private_Views
8018 (Pack_Id : Entity_Id;
8019 Is_Package : Boolean := True)
8028 M := First_Elmt (Exchanged_Views);
8029 while Present (M) loop
8032 -- Subtypes of types whose views have been exchanged, and that
8033 -- are defined within the instance, were not on the list of
8034 -- Private_Dependents on entry to the instance, so they have to
8035 -- be exchanged explicitly now, in order to remain consistent with
8036 -- the view of the parent type.
8038 if Ekind (Typ) = E_Private_Type
8039 or else Ekind (Typ) = E_Limited_Private_Type
8040 or else Ekind (Typ) = E_Record_Type_With_Private
8042 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8044 while Present (Dep_Elmt) loop
8045 Dep_Typ := Node (Dep_Elmt);
8047 if Scope (Dep_Typ) = Pack_Id
8048 and then Present (Full_View (Dep_Typ))
8050 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8051 Exchange_Declarations (Dep_Typ);
8054 Next_Elmt (Dep_Elmt);
8058 Exchange_Declarations (Node (M));
8062 if No (Pack_Id) then
8066 -- Make the generic formal parameters private, and make the formal
8067 -- types into subtypes of the actuals again.
8069 E := First_Entity (Pack_Id);
8071 while Present (E) loop
8072 Set_Is_Hidden (E, True);
8075 and then Nkind (Parent (E)) = N_Subtype_Declaration
8077 Set_Is_Generic_Actual_Type (E, False);
8079 -- An unusual case of aliasing: the actual may also be directly
8080 -- visible in the generic, and be private there, while it is
8081 -- fully visible in the context of the instance. The internal
8082 -- subtype is private in the instance, but has full visibility
8083 -- like its parent in the enclosing scope. This enforces the
8084 -- invariant that the privacy status of all private dependents of
8085 -- a type coincide with that of the parent type. This can only
8086 -- happen when a generic child unit is instantiated within a
8089 if Is_Private_Type (E)
8090 and then not Is_Private_Type (Etype (E))
8092 Exchange_Declarations (E);
8095 elsif Ekind (E) = E_Package then
8097 -- The end of the renaming list is the renaming of the generic
8098 -- package itself. If the instance is a subprogram, all entities
8099 -- in the corresponding package are renamings. If this entity is
8100 -- a formal package, make its own formals private as well. The
8101 -- actual in this case is itself the renaming of an instantation.
8102 -- If the entity is not a package renaming, it is the entity
8103 -- created to validate formal package actuals: ignore.
8105 -- If the actual is itself a formal package for the enclosing
8106 -- generic, or the actual for such a formal package, it remains
8107 -- visible after the current instance, and therefore nothing
8108 -- needs to be done either, except to keep it accessible.
8111 and then Renamed_Object (E) = Pack_Id
8115 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8118 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8119 Set_Is_Hidden (E, False);
8123 Act_P : Entity_Id := Renamed_Object (E);
8124 Id : Entity_Id := First_Entity (Act_P);
8128 and then Id /= First_Private_Entity (Act_P)
8130 Set_Is_Hidden (Id, True);
8131 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8132 exit when Ekind (Id) = E_Package
8133 and then Renamed_Object (Id) = Act_P;
8144 end Restore_Private_Views;
8151 (Gen_Unit : Entity_Id;
8152 Act_Unit : Entity_Id)
8154 Saved : Instance_Env;
8157 Saved.Ada_83 := Ada_83;
8158 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8159 Saved.Exchanged_Views := Exchanged_Views;
8160 Saved.Hidden_Entities := Hidden_Entities;
8161 Saved.Current_Sem_Unit := Current_Sem_Unit;
8162 Instance_Envs.Increment_Last;
8163 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8165 -- Regardless of the current mode, predefined units are analyzed in
8166 -- Ada95 mode, and Ada83 checks don't apply.
8168 if Is_Internal_File_Name
8169 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8170 Renamings_Included => True) then
8174 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8175 Exchanged_Views := New_Elmt_List;
8176 Hidden_Entities := New_Elmt_List;
8179 ----------------------------
8180 -- Save_Global_References --
8181 ----------------------------
8183 procedure Save_Global_References (N : Node_Id) is
8184 Gen_Scope : Entity_Id;
8188 function Is_Global (E : Entity_Id) return Boolean;
8189 -- Check whether entity is defined outside of generic unit.
8190 -- Examine the scope of an entity, and the scope of the scope,
8191 -- etc, until we find either Standard, in which case the entity
8192 -- is global, or the generic unit itself, which indicates that
8193 -- the entity is local. If the entity is the generic unit itself,
8194 -- as in the case of a recursive call, or the enclosing generic unit,
8195 -- if different from the current scope, then it is local as well,
8196 -- because it will be replaced at the point of instantiation. On
8197 -- the other hand, if it is a reference to a child unit of a common
8198 -- ancestor, which appears in an instantiation, it is global because
8199 -- it is used to denote a specific compilation unit at the time the
8200 -- instantiations will be analyzed.
8202 procedure Reset_Entity (N : Node_Id);
8203 -- Save semantic information on global entity, so that it is not
8204 -- resolved again at instantiation time.
8206 procedure Save_Entity_Descendants (N : Node_Id);
8207 -- Apply Save_Global_References to the two syntactic descendants of
8208 -- nodes that carry entities, i.e. identifiers, character literals,
8209 -- expanded names, and operators.
8211 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8212 -- Default actuals in nested instances must be handled specially
8213 -- because there is no link to them from the original tree. When an
8214 -- actual subprogram is given by a default, we add an explicit generic
8215 -- association for it in the instantiation node. When we save the
8216 -- global references on the name of the instance, we recover the list
8217 -- of generic associations, and add an explicit one to the original
8218 -- generic tree, through which a global actual can be preserved.
8219 -- Similarly, if a child unit is instantiated within a sibling, in the
8220 -- context of the parent, we must preserve the identifier of the parent
8221 -- so that it can be properly resolved in a subsequent instantiation.
8223 procedure Save_Global_Descendant (D : Union_Id);
8224 -- Apply Save_Global_References recursively to the descendents of
8227 procedure Save_References (N : Node_Id);
8228 -- This is the recursive procedure that does the work, once the
8229 -- enclosing generic scope has been established.
8235 function Is_Global (E : Entity_Id) return Boolean is
8236 Se : Entity_Id := Scope (E);
8238 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8239 -- Determine whether the parent node of a reference to a child unit
8240 -- denotes an instantiation or a formal package, in which case the
8241 -- reference to the child unit is global, even if it appears within
8242 -- the current scope (e.g. when the instance appears within the body
8245 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8247 return (Nkind (Decl) in N_Generic_Instantiation
8249 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8250 end Is_Instance_Node;
8252 -- Start of processing for Is_Global
8255 if E = Gen_Scope then
8258 elsif E = Standard_Standard then
8261 elsif Is_Child_Unit (E)
8262 and then (Is_Instance_Node (Parent (N2))
8263 or else (Nkind (Parent (N2)) = N_Expanded_Name
8264 and then N2 = Selector_Name (Parent (N2))
8265 and then Is_Instance_Node (Parent (Parent (N2)))))
8270 while Se /= Gen_Scope loop
8271 if Se = Standard_Standard then
8286 procedure Reset_Entity (N : Node_Id) is
8288 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8289 -- The type of N2 is global to the generic unit. Save the
8290 -- type in the generic node.
8292 ---------------------
8293 -- Set_Global_Type --
8294 ---------------------
8296 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8297 Typ : constant Entity_Id := Etype (N2);
8303 and then Has_Private_View (Entity (N))
8305 -- If the entity of N is not the associated node, this is
8306 -- a nested generic and it has an associated node as well,
8307 -- whose type is already the full view (see below). Indicate
8308 -- that the original node has a private view.
8310 Set_Has_Private_View (N);
8313 -- If not a private type, nothing else to do
8315 if not Is_Private_Type (Typ) then
8316 if Is_Array_Type (Typ)
8317 and then Is_Private_Type (Component_Type (Typ))
8319 Set_Has_Private_View (N);
8322 -- If it is a derivation of a private type in a context where
8323 -- no full view is needed, nothing to do either.
8325 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8328 -- Otherwise mark the type for flipping and use the full_view
8332 Set_Has_Private_View (N);
8334 if Present (Full_View (Typ)) then
8335 Set_Etype (N2, Full_View (Typ));
8338 end Set_Global_Type;
8340 -- Start of processing for Reset_Entity
8343 N2 := Get_Associated_Node (N);
8347 if Is_Global (E) then
8348 Set_Global_Type (N, N2);
8350 elsif Nkind (N) = N_Op_Concat
8351 and then Is_Generic_Type (Etype (N2))
8353 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8354 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8355 and then Is_Intrinsic_Subprogram (E)
8360 -- Entity is local. Mark generic node as unresolved.
8361 -- Note that now it does not have an entity.
8363 Set_Associated_Node (N, Empty);
8364 Set_Etype (N, Empty);
8367 if (Nkind (Parent (N)) = N_Package_Instantiation
8368 or else Nkind (Parent (N)) = N_Function_Instantiation
8369 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8370 and then N = Name (Parent (N))
8372 Save_Global_Defaults (Parent (N), Parent (N2));
8375 elsif Nkind (Parent (N)) = N_Selected_Component
8376 and then Nkind (Parent (N2)) = N_Expanded_Name
8379 if Is_Global (Entity (Parent (N2))) then
8380 Change_Selected_Component_To_Expanded_Name (Parent (N));
8381 Set_Associated_Node (Parent (N), Parent (N2));
8382 Set_Global_Type (Parent (N), Parent (N2));
8383 Save_Entity_Descendants (N);
8385 -- If this is a reference to the current generic entity,
8386 -- replace it with a simple name. This is to avoid anomalies
8387 -- when the enclosing scope is also a generic unit, in which
8388 -- case the selected component will not resolve to the current
8389 -- unit within an instance of the outer one. Ditto if the
8390 -- entity is an enclosing scope, e.g. a parent unit.
8392 elsif In_Open_Scopes (Entity (Parent (N2)))
8393 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8395 Rewrite (Parent (N),
8396 Make_Identifier (Sloc (N),
8397 Chars => Chars (Selector_Name (Parent (N2)))));
8400 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8401 or else Nkind (Parent (Parent (N)))
8402 = N_Function_Instantiation
8403 or else Nkind (Parent (Parent (N)))
8404 = N_Procedure_Instantiation)
8405 and then Parent (N) = Name (Parent (Parent (N)))
8407 Save_Global_Defaults
8408 (Parent (Parent (N)), Parent (Parent ((N2))));
8411 -- A selected component may denote a static constant that has
8412 -- been folded. Make the same replacement in original tree.
8414 elsif Nkind (Parent (N)) = N_Selected_Component
8415 and then (Nkind (Parent (N2)) = N_Integer_Literal
8416 or else Nkind (Parent (N2)) = N_Real_Literal)
8418 Rewrite (Parent (N),
8419 New_Copy (Parent (N2)));
8420 Set_Analyzed (Parent (N), False);
8422 -- A selected component may be transformed into a parameterless
8423 -- function call. If the called entity is global, rewrite the
8424 -- node appropriately, i.e. as an extended name for the global
8427 elsif Nkind (Parent (N)) = N_Selected_Component
8428 and then Nkind (Parent (N2)) = N_Function_Call
8429 and then Is_Global (Entity (Name (Parent (N2))))
8431 Change_Selected_Component_To_Expanded_Name (Parent (N));
8432 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8433 Set_Global_Type (Parent (N), Name (Parent (N2)));
8434 Save_Entity_Descendants (N);
8437 -- Entity is local. Reset in generic unit, so that node
8438 -- is resolved anew at the point of instantiation.
8440 Set_Associated_Node (N, Empty);
8441 Set_Etype (N, Empty);
8445 -----------------------------
8446 -- Save_Entity_Descendants --
8447 -----------------------------
8449 procedure Save_Entity_Descendants (N : Node_Id) is
8451 use Atree.Unchecked_Access;
8452 -- This code section is part of the implementation of an untyped
8453 -- tree traversal, so it needs direct access to node fields.
8456 Save_Global_Descendant (Field2 (N));
8457 Save_Global_Descendant (Field3 (N));
8458 end Save_Entity_Descendants;
8460 --------------------------
8461 -- Save_Global_Defaults --
8462 --------------------------
8464 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8465 Loc : constant Source_Ptr := Sloc (N1);
8466 Assoc1 : List_Id := Generic_Associations (N1);
8467 Assoc2 : List_Id := Generic_Associations (N2);
8471 Gen_Id : Entity_Id := Entity (Name (N2));
8477 if Present (Assoc1) then
8478 Act1 := First (Assoc1);
8481 Set_Generic_Associations (N1, New_List);
8482 Assoc1 := Generic_Associations (N1);
8485 if Present (Assoc2) then
8486 Act2 := First (Assoc2);
8491 while Present (Act1) and then Present (Act2) loop
8496 -- Find the associations added for default suprograms.
8498 if Present (Act2) then
8499 while Nkind (Act2) /= N_Generic_Association
8500 or else No (Entity (Selector_Name (Act2)))
8501 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8506 -- Add a similar association if the default is global. The
8507 -- renaming declaration for the actual has been analyzed, and
8508 -- its alias is the program it renames. Link the actual in the
8509 -- original generic tree with the node in the analyzed tree.
8511 while Present (Act2) loop
8512 Subp := Entity (Selector_Name (Act2));
8513 Def := Explicit_Generic_Actual_Parameter (Act2);
8515 -- Following test is defence against rubbish errors
8517 if No (Alias (Subp)) then
8521 -- Retrieve the resolved actual from the renaming declaration
8522 -- created for the instantiated formal.
8524 Actual := Entity (Name (Parent (Parent (Subp))));
8525 Set_Entity (Def, Actual);
8526 Set_Etype (Def, Etype (Actual));
8528 if Is_Global (Actual) then
8530 Make_Generic_Association (Loc,
8531 Selector_Name => New_Occurrence_Of (Subp, Loc),
8532 Explicit_Generic_Actual_Parameter =>
8533 New_Occurrence_Of (Actual, Loc));
8536 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8538 Append (Ndec, Assoc1);
8540 -- If there are other defaults, add a dummy association
8541 -- in case there are other defaulted formals with the same
8544 elsif Present (Next (Act2)) then
8546 Make_Generic_Association (Loc,
8547 Selector_Name => New_Occurrence_Of (Subp, Loc),
8548 Explicit_Generic_Actual_Parameter => Empty);
8550 Append (Ndec, Assoc1);
8557 if Nkind (Name (N1)) = N_Identifier
8558 and then Is_Child_Unit (Gen_Id)
8559 and then Is_Global (Gen_Id)
8560 and then Is_Generic_Unit (Scope (Gen_Id))
8561 and then In_Open_Scopes (Scope (Gen_Id))
8563 -- This is an instantiation of a child unit within a sibling,
8564 -- so that the generic parent is in scope. An eventual instance
8565 -- must occur within the scope of an instance of the parent.
8566 -- Make name in instance into an expanded name, to preserve the
8567 -- identifier of the parent, so it can be resolved subsequently.
8570 Make_Expanded_Name (Loc,
8571 Chars => Chars (Gen_Id),
8572 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8573 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8574 Set_Entity (Name (N2), Gen_Id);
8577 Make_Expanded_Name (Loc,
8578 Chars => Chars (Gen_Id),
8579 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8580 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8582 Set_Associated_Node (Name (N1), Name (N2));
8583 Set_Associated_Node (Prefix (Name (N1)), Empty);
8585 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8586 Set_Etype (Name (N1), Etype (Gen_Id));
8589 end Save_Global_Defaults;
8591 ----------------------------
8592 -- Save_Global_Descendant --
8593 ----------------------------
8595 procedure Save_Global_Descendant (D : Union_Id) is
8599 if D in Node_Range then
8600 if D = Union_Id (Empty) then
8603 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8604 Save_References (Node_Id (D));
8607 elsif D in List_Range then
8608 if D = Union_Id (No_List)
8609 or else Is_Empty_List (List_Id (D))
8614 N1 := First (List_Id (D));
8615 while Present (N1) loop
8616 Save_References (N1);
8621 -- Element list or other non-node field, nothing to do
8626 end Save_Global_Descendant;
8628 ---------------------
8629 -- Save_References --
8630 ---------------------
8632 -- This is the recursive procedure that does the work, once the
8633 -- enclosing generic scope has been established. We have to treat
8634 -- specially a number of node rewritings that are required by semantic
8635 -- processing and which change the kind of nodes in the generic copy:
8636 -- typically constant-folding, replacing an operator node by a string
8637 -- literal, or a selected component by an expanded name. In each of
8638 -- those cases, the transformation is propagated to the generic unit.
8640 procedure Save_References (N : Node_Id) is
8645 elsif (Nkind (N) = N_Character_Literal
8646 or else Nkind (N) = N_Operator_Symbol)
8648 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8651 elsif Nkind (N) = N_Operator_Symbol
8652 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
8654 Change_Operator_Symbol_To_String_Literal (N);
8657 elsif Nkind (N) in N_Op then
8659 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8661 if Nkind (N) = N_Op_Concat then
8662 Set_Is_Component_Left_Opnd (N,
8663 Is_Component_Left_Opnd (Get_Associated_Node (N)));
8665 Set_Is_Component_Right_Opnd (N,
8666 Is_Component_Right_Opnd (Get_Associated_Node (N)));
8671 -- Node may be transformed into call to a user-defined operator
8673 N2 := Get_Associated_Node (N);
8675 if Nkind (N2) = N_Function_Call then
8676 E := Entity (Name (N2));
8679 and then Is_Global (E)
8681 Set_Etype (N, Etype (N2));
8683 Set_Associated_Node (N, Empty);
8684 Set_Etype (N, Empty);
8687 elsif Nkind (N2) = N_Integer_Literal
8688 or else Nkind (N2) = N_Real_Literal
8689 or else Nkind (N2) = N_String_Literal
8690 or else (Nkind (N2) = N_Identifier
8692 Ekind (Entity (N2)) = E_Enumeration_Literal)
8694 -- Operation was constant-folded, perform the same
8695 -- replacement in generic.
8697 -- Note: we do a Replace here rather than a Rewrite,
8698 -- which is a definite violation of the standard rules
8699 -- with regard to retrievability of the original tree,
8700 -- and likely ASIS bugs or at least irregularities are
8701 -- caused by this choice.
8703 -- The reason we do this is that the appropriate original
8704 -- nodes are never constructed (we don't go applying the
8705 -- generic instantiation to rewritten nodes in general).
8706 -- We could try to create an appropriate copy but it would
8707 -- be hard work and does not seem worth while, because
8708 -- the original expression is accessible in the generic,
8709 -- and ASIS rules for traversing instances are fuzzy.
8711 Replace (N, New_Copy (N2));
8712 Set_Analyzed (N, False);
8716 -- Complete the check on operands
8718 Save_Entity_Descendants (N);
8720 elsif Nkind (N) = N_Identifier then
8721 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
8723 -- If this is a discriminant reference, always save it.
8724 -- It is used in the instance to find the corresponding
8725 -- discriminant positionally rather than by name.
8727 Set_Original_Discriminant
8728 (N, Original_Discriminant (Get_Associated_Node (N)));
8732 N2 := Get_Associated_Node (N);
8734 if Nkind (N2) = N_Function_Call then
8735 E := Entity (Name (N2));
8737 -- Name resolves to a call to parameterless function.
8738 -- If original entity is global, mark node as resolved.
8741 and then Is_Global (E)
8743 Set_Etype (N, Etype (N2));
8745 Set_Associated_Node (N, Empty);
8746 Set_Etype (N, Empty);
8750 Nkind (N2) = N_Integer_Literal or else
8751 Nkind (N2) = N_Real_Literal or else
8752 Nkind (N2) = N_String_Literal
8754 -- Name resolves to named number that is constant-folded,
8755 -- or to string literal from concatenation.
8756 -- Perform the same replacement in generic.
8758 Rewrite (N, New_Copy (N2));
8759 Set_Analyzed (N, False);
8761 elsif Nkind (N2) = N_Explicit_Dereference then
8763 -- An identifier is rewritten as a dereference if it is
8764 -- the prefix in a selected component, and it denotes an
8765 -- access to a composite type, or a parameterless function
8766 -- call that returns an access type.
8768 -- Check whether corresponding entity in prefix is global.
8770 if Is_Entity_Name (Prefix (N2))
8771 and then Present (Entity (Prefix (N2)))
8772 and then Is_Global (Entity (Prefix (N2)))
8775 Make_Explicit_Dereference (Sloc (N),
8776 Prefix => Make_Identifier (Sloc (N),
8777 Chars => Chars (N))));
8778 Set_Associated_Node (Prefix (N), Prefix (N2));
8780 elsif Nkind (Prefix (N2)) = N_Function_Call
8781 and then Is_Global (Entity (Name (Prefix (N2))))
8784 Make_Explicit_Dereference (Sloc (N),
8785 Prefix => Make_Function_Call (Sloc (N),
8787 Make_Identifier (Sloc (N),
8788 Chars => Chars (N)))));
8791 (Name (Prefix (N)), Name (Prefix (N2)));
8794 Set_Associated_Node (N, Empty);
8795 Set_Etype (N, Empty);
8798 -- The subtype mark of a nominally unconstrained object
8799 -- is rewritten as a subtype indication using the bounds
8800 -- of the expression. Recover the original subtype mark.
8802 elsif Nkind (N2) = N_Subtype_Indication
8803 and then Is_Entity_Name (Original_Node (N2))
8805 Set_Associated_Node (N, Original_Node (N2));
8813 elsif Nkind (N) in N_Entity then
8818 use Atree.Unchecked_Access;
8819 -- This code section is part of implementing an untyped tree
8820 -- traversal, so it needs direct access to node fields.
8823 if Nkind (N) = N_Aggregate
8825 Nkind (N) = N_Extension_Aggregate
8827 N2 := Get_Associated_Node (N);
8830 or else No (Etype (N2))
8831 or else not Is_Global (Etype (N2))
8833 Set_Associated_Node (N, Empty);
8836 Save_Global_Descendant (Field1 (N));
8837 Save_Global_Descendant (Field2 (N));
8838 Save_Global_Descendant (Field3 (N));
8839 Save_Global_Descendant (Field5 (N));
8841 -- All other cases than aggregates
8844 Save_Global_Descendant (Field1 (N));
8845 Save_Global_Descendant (Field2 (N));
8846 Save_Global_Descendant (Field3 (N));
8847 Save_Global_Descendant (Field4 (N));
8848 Save_Global_Descendant (Field5 (N));
8852 end Save_References;
8854 -- Start of processing for Save_Global_References
8857 Gen_Scope := Current_Scope;
8859 -- If the generic unit is a child unit, references to entities in
8860 -- the parent are treated as local, because they will be resolved
8861 -- anew in the context of the instance of the parent.
8863 while Is_Child_Unit (Gen_Scope)
8864 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8866 Gen_Scope := Scope (Gen_Scope);
8869 Save_References (N);
8870 end Save_Global_References;
8872 ---------------------
8873 -- Set_Copied_Sloc --
8874 ---------------------
8876 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8878 Create_Instantiation_Source (N, E, S_Adjustment);
8879 end Set_Copied_Sloc;
8881 ---------------------
8882 -- Set_Instance_Of --
8883 ---------------------
8885 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8887 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8888 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8889 Generic_Renamings.Increment_Last;
8890 end Set_Instance_Of;
8892 --------------------
8893 -- Set_Next_Assoc --
8894 --------------------
8896 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8898 Generic_Renamings.Table (E).Next_In_HTable := Next;
8905 procedure Start_Generic is
8907 -- ??? I am sure more things could be factored out in this
8908 -- routine. Should probably be done at a later stage.
8910 Generic_Flags.Increment_Last;
8911 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
8912 Inside_A_Generic := True;
8914 Expander_Mode_Save_And_Set (False);
8921 procedure Switch_View (T : Entity_Id) is
8922 Priv_Elmt : Elmt_Id := No_Elmt;
8923 Priv_Sub : Entity_Id;
8924 BT : Entity_Id := Base_Type (T);
8927 -- T may be private but its base type may have been exchanged through
8928 -- some other occurrence, in which case there is nothing to switch.
8930 if not Is_Private_Type (BT) then
8934 Priv_Elmt := First_Elmt (Private_Dependents (BT));
8936 if Present (Full_View (BT)) then
8937 Append_Elmt (Full_View (BT), Exchanged_Views);
8938 Exchange_Declarations (BT);
8941 while Present (Priv_Elmt) loop
8942 Priv_Sub := (Node (Priv_Elmt));
8944 -- We avoid flipping the subtype if the Etype of its full
8945 -- view is private because this would result in a malformed
8946 -- subtype. This occurs when the Etype of the subtype full
8947 -- view is the full view of the base type (and since the
8948 -- base types were just switched, the subtype is pointing
8949 -- to the wrong view). This is currently the case for
8950 -- tagged record types, access types (maybe more?) and
8951 -- needs to be resolved. ???
8953 if Present (Full_View (Priv_Sub))
8954 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
8956 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
8957 Exchange_Declarations (Priv_Sub);
8960 Next_Elmt (Priv_Elmt);
8964 -----------------------------
8965 -- Valid_Default_Attribute --
8966 -----------------------------
8968 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
8969 Attr_Id : constant Attribute_Id :=
8970 Get_Attribute_Id (Attribute_Name (Def));
8973 T : Entity_Id := Entity (Prefix (Def));
8975 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
8985 F := First_Formal (Nam);
8986 while Present (F) loop
8992 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
8993 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
8994 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
8995 Attribute_Unbiased_Rounding =>
8996 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
8998 when Attribute_Image | Attribute_Pred | Attribute_Succ |
8999 Attribute_Value | Attribute_Wide_Image |
9000 Attribute_Wide_Value =>
9001 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
9003 when Attribute_Max | Attribute_Min =>
9004 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
9006 when Attribute_Input =>
9007 OK := (Is_Fun and then Num_F = 1);
9009 when Attribute_Output | Attribute_Read | Attribute_Write =>
9010 OK := (not Is_Fun and then Num_F = 2);
9012 when others => OK := False;
9016 Error_Msg_N ("attribute reference has wrong profile for subprogram",
9019 end Valid_Default_Attribute;