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 use Atree.Unchecked_Access;
79 -- This package performs untyped traversals of the tree, therefore it
80 -- needs direct access to the fields of a node.
82 ----------------------------------------------------------
83 -- Implementation of Generic Analysis and Instantiation --
84 -----------------------------------------------------------
86 -- GNAT implements generics by macro expansion. No attempt is made to
87 -- share generic instantiations (for now). Analysis of a generic definition
88 -- does not perform any expansion action, but the expander must be called
89 -- on the tree for each instantiation, because the expansion may of course
90 -- depend on the generic actuals. All of this is best achieved as follows:
92 -- a) Semantic analysis of a generic unit is performed on a copy of the
93 -- tree for the generic unit. All tree modifications that follow analysis
94 -- do not affect the original tree. Links are kept between the original
95 -- tree and the copy, in order to recognize non-local references within
96 -- the generic, and propagate them to each instance (recall that name
97 -- resolution is done on the generic declaration: generics are not really
98 -- macros!). This is summarized in the following diagram:
100 -- .-----------. .----------.
101 -- | semantic |<--------------| generic |
103 -- | |==============>| |
104 -- |___________| global |__________|
115 -- b) Each instantiation copies the original tree, and inserts into it a
116 -- series of declarations that describe the mapping between generic formals
117 -- and actuals. For example, a generic In OUT parameter is an object
118 -- renaming of the corresponing actual, etc. Generic IN parameters are
119 -- constant declarations.
121 -- c) In order to give the right visibility for these renamings, we use
122 -- a different scheme for package and subprogram instantiations. For
123 -- packages, the list of renamings is inserted into the package
124 -- specification, before the visible declarations of the package. The
125 -- renamings are analyzed before any of the text of the instance, and are
126 -- thus visible at the right place. Furthermore, outside of the instance,
127 -- the generic parameters are visible and denote their corresponding
130 -- For subprograms, we create a container package to hold the renamings
131 -- and the subprogram instance itself. Analysis of the package makes the
132 -- renaming declarations visible to the subprogram. After analyzing the
133 -- package, the defining entity for the subprogram is touched-up so that
134 -- it appears declared in the current scope, and not inside the container
137 -- If the instantiation is a compilation unit, the container package is
138 -- given the same name as the subprogram instance. This ensures that
139 -- the elaboration procedure called by the binder, using the compilation
140 -- unit name, calls in fact the elaboration procedure for the package.
142 -- Not surprisingly, private types complicate this approach. By saving in
143 -- the original generic object the non-local references, we guarantee that
144 -- the proper entities are referenced at the point of instantiation.
145 -- However, for private types, this by itself does not insure that the
146 -- proper VIEW of the entity is used (the full type may be visible at the
147 -- point of generic definition, but not at instantiation, or vice-versa).
148 -- In order to reference the proper view, we special-case any reference
149 -- to private types in the generic object, by saving both views, one in
150 -- the generic and one in the semantic copy. At time of instantiation, we
151 -- check whether the two views are consistent, and exchange declarations if
152 -- necessary, in order to restore the correct visibility. Similarly, if
153 -- the instance view is private when the generic view was not, we perform
154 -- the exchange. After completing the instantiation, we restore the
155 -- current visibility. The flag Has_Private_View marks identifiers in the
156 -- the generic unit that require checking.
158 -- Visibility within nested generic units requires special handling.
159 -- Consider the following scheme:
161 -- type Global is ... -- outside of generic unit.
165 -- type Semi_Global is ... -- global to inner.
168 -- procedure inner (X1 : Global; X2 : Semi_Global);
170 -- procedure in2 is new inner (...); -- 4
173 -- package New_Outer is new Outer (...); -- 2
174 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
176 -- The semantic analysis of Outer captures all occurrences of Global.
177 -- The semantic analysis of Inner (at 1) captures both occurrences of
178 -- Global and Semi_Global.
180 -- At point 2 (instantiation of Outer), we also produce a generic copy
181 -- of Inner, even though Inner is, at that point, not being instantiated.
182 -- (This is just part of the semantic analysis of New_Outer).
184 -- Critically, references to Global within Inner must be preserved, while
185 -- references to Semi_Global should not preserved, because they must now
186 -- resolve to an entity within New_Outer. To distinguish between these, we
187 -- use a global variable, Current_Instantiated_Parent, which is set when
188 -- performing a generic copy during instantiation (at 2). This variable is
189 -- used when performing a generic copy that is not an instantiation, but
190 -- that is nested within one, as the occurrence of 1 within 2. The analysis
191 -- of a nested generic only preserves references that are global to the
192 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
193 -- determine whether a reference is external to the given parent.
195 -- The instantiation at point 3 requires no special treatment. The method
196 -- works as well for further nestings of generic units, but of course the
197 -- variable Current_Instantiated_Parent must be stacked because nested
198 -- instantiations can occur, e.g. the occurrence of 4 within 2.
200 -- The instantiation of package and subprogram bodies is handled in a
201 -- similar manner, except that it is delayed until after semantic
202 -- analysis is complete. In this fashion complex cross-dependencies
203 -- between several package declarations and bodies containing generics
204 -- can be compiled which otherwise would diagnose spurious circularities.
206 -- For example, it is possible to compile two packages A and B that
207 -- have the following structure:
209 -- package A is package B is
210 -- generic ... generic ...
211 -- package G_A is package G_B is
214 -- package body A is package body B is
215 -- package N_B is new G_B (..) package N_A is new G_A (..)
217 -- The table Pending_Instantiations in package Inline is used to keep
218 -- track of body instantiations that are delayed in this manner. Inline
219 -- handles the actual calls to do the body instantiations. This activity
220 -- is part of Inline, since the processing occurs at the same point, and
221 -- for essentially the same reason, as the handling of inlined routines.
223 ----------------------------------------------
224 -- Detection of Instantiation Circularities --
225 ----------------------------------------------
227 -- If we have a chain of instantiations that is circular, this is a
228 -- static error which must be detected at compile time. The detection
229 -- of these circularities is carried out at the point that we insert
230 -- a generic instance spec or body. If there is a circularity, then
231 -- the analysis of the offending spec or body will eventually result
232 -- in trying to load the same unit again, and we detect this problem
233 -- as we analyze the package instantiation for the second time.
235 -- At least in some cases after we have detected the circularity, we
236 -- get into trouble if we try to keep going. The following flag is
237 -- set if a circularity is detected, and used to abandon compilation
238 -- after the messages have been posted.
240 Circularity_Detected : Boolean := False;
241 -- This should really be reset on encountering a new main unit, but in
242 -- practice we are not using multiple main units so it is not critical.
244 -----------------------
245 -- Local subprograms --
246 -----------------------
248 procedure Abandon_Instantiation (N : Node_Id);
249 pragma No_Return (Abandon_Instantiation);
250 -- Posts an error message "instantiation abandoned" at the indicated
251 -- node and then raises the exception Instantiation_Error to do it.
253 procedure Analyze_Formal_Array_Type
254 (T : in out Entity_Id;
256 -- A formal array type is treated like an array type declaration, and
257 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
258 -- in-out, because in the case of an anonymous type the entity is
259 -- actually created in the procedure.
261 -- The following procedures treat other kinds of formal parameters.
263 procedure Analyze_Formal_Derived_Type
268 -- All the following need comments???
270 procedure Analyze_Formal_Decimal_Fixed_Point_Type
271 (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
273 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
274 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
276 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
277 (T : Entity_Id; Def : Node_Id);
279 procedure Analyze_Formal_Private_Type
283 -- This needs comments???
285 procedure Analyze_Generic_Formal_Part (N : Node_Id);
287 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
288 -- This needs comments ???
290 function Analyze_Associations
295 -- At instantiation time, build the list of associations between formals
296 -- and actuals. Each association becomes a renaming declaration for the
297 -- formal entity. F_Copy is the analyzed list of formals in the generic
298 -- copy. It is used to apply legality checks to the actuals. I_Node is the
299 -- instantiation node itself.
301 procedure Analyze_Subprogram_Instantiation
305 procedure Build_Instance_Compilation_Unit_Nodes
309 -- This procedure is used in the case where the generic instance of a
310 -- subprogram body or package body is a library unit. In this case, the
311 -- original library unit node for the generic instantiation must be
312 -- replaced by the resulting generic body, and a link made to a new
313 -- compilation unit node for the generic declaration. The argument N is
314 -- the original generic instantiation. Act_Body and Act_Decl are the body
315 -- and declaration of the instance (either package body and declaration
316 -- nodes or subprogram body and declaration nodes depending on the case).
317 -- On return, the node N has been rewritten with the actual body.
319 procedure Check_Formal_Packages (P_Id : Entity_Id);
320 -- Apply the following to all formal packages in generic associations.
322 procedure Check_Formal_Package_Instance
323 (Formal_Pack : Entity_Id;
324 Actual_Pack : Entity_Id);
325 -- Verify that the actuals of the actual instance match the actuals of
326 -- the template for a formal package that is not declared with a box.
328 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id);
329 -- If the generic is a local entity and the corresponding body has not
330 -- been seen yet, flag enclosing packages to indicate that it will be
331 -- elaborated after the generic body. Subprograms declared in the same
332 -- package cannot be inlined by the front-end because front-end inlining
333 -- requires a strict linear order of elaboration.
335 procedure Check_Hidden_Child_Unit
337 Gen_Unit : Entity_Id;
338 Act_Decl_Id : Entity_Id);
339 -- If the generic unit is an implicit child instance within a parent
340 -- instance, we need to make an explicit test that it is not hidden by
341 -- a child instance of the same name and parent.
343 procedure Check_Private_View (N : Node_Id);
344 -- Check whether the type of a generic entity has a different view between
345 -- the point of generic analysis and the point of instantiation. If the
346 -- view has changed, then at the point of instantiation we restore the
347 -- correct view to perform semantic analysis of the instance, and reset
348 -- the current view after instantiation. The processing is driven by the
349 -- current private status of the type of the node, and Has_Private_View,
350 -- a flag that is set at the point of generic compilation. If view and
351 -- flag are inconsistent then the type is updated appropriately.
353 procedure Check_Generic_Actuals
354 (Instance : Entity_Id;
355 Is_Formal_Box : Boolean);
356 -- Similar to previous one. Check the actuals in the instantiation,
357 -- whose views can change between the point of instantiation and the point
358 -- of instantiation of the body. In addition, mark the generic renamings
359 -- as generic actuals, so that they are not compatible with other actuals.
360 -- Recurse on an actual that is a formal package whose declaration has
363 function Contains_Instance_Of
368 -- Inner is instantiated within the generic Outer. Check whether Inner
369 -- directly or indirectly contains an instance of Outer or of one of its
370 -- parents, in the case of a subunit. Each generic unit holds a list of
371 -- the entities instantiated within (at any depth). This procedure
372 -- determines whether the set of such lists contains a cycle, i.e. an
373 -- illegal circular instantiation.
375 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean;
376 -- Returns True if E is a formal package of an enclosing generic, or
377 -- the actual for such a formal in an enclosing instantiation. Used in
378 -- Restore_Private_Views, to keep the formals of such a package visible
379 -- on exit from an inner instantiation.
381 function Find_Actual_Type
383 Gen_Scope : Entity_Id)
385 -- When validating the actual types of a child instance, check whether
386 -- the formal is a formal type of the parent unit, and retrieve the current
387 -- actual for it. Typ is the entity in the analyzed formal type declaration
388 -- (component or index type of an array type) and Gen_Scope is the scope of
389 -- the analyzed formal array type.
391 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
392 -- Given the entity of a unit that is an instantiation, retrieve the
393 -- original instance node. This is used when loading the instantiations
394 -- of the ancestors of a child generic that is being instantiated.
396 function In_Same_Declarative_Part
400 -- True if the instantiation Inst and the given freeze_node F_Node appear
401 -- within the same declarative part, ignoring subunits, but with no inter-
402 -- vening suprograms or concurrent units. If true, the freeze node
403 -- of the instance can be placed after the freeze node of the parent,
404 -- which it itself an instance.
406 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
407 -- Associate analyzed generic parameter with corresponding
408 -- instance. Used for semantic checks at instantiation time.
410 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
411 -- Traverse the Exchanged_Views list to see if a type was private
412 -- and has already been flipped during this phase of instantiation.
414 procedure Hide_Current_Scope;
415 -- When compiling a generic child unit, the parent context must be
416 -- present, but the instance and all entities that may be generated
417 -- must be inserted in the current scope. We leave the current scope
418 -- on the stack, but make its entities invisible to avoid visibility
419 -- problems. This is reversed at the end of instantiations. This is
420 -- not done for the instantiation of the bodies, which only require the
421 -- instances of the generic parents to be in scope.
423 procedure Install_Body
428 -- If the instantiation happens textually before the body of the generic,
429 -- the instantiation of the body must be analyzed after the generic body,
430 -- and not at the point of instantiation. Such early instantiations can
431 -- happen if the generic and the instance appear in a package declaration
432 -- because the generic body can only appear in the corresponding package
433 -- body. Early instantiations can also appear if generic, instance and
434 -- body are all in the declarative part of a subprogram or entry. Entities
435 -- of packages that are early instantiations are delayed, and their freeze
436 -- node appears after the generic body.
438 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
439 -- Insert freeze node at the end of the declarative part that includes the
440 -- instance node N. If N is in the visible part of an enclosing package
441 -- declaration, the freeze node has to be inserted at the end of the
442 -- private declarations, if any.
444 procedure Freeze_Subprogram_Body
445 (Inst_Node : Node_Id;
447 Pack_Id : Entity_Id);
448 -- The generic body may appear textually after the instance, including
449 -- in the proper body of a stub, or within a different package instance.
450 -- Given that the instance can only be elaborated after the generic, we
451 -- place freeze_nodes for the instance and/or for packages that may enclose
452 -- the instance and the generic, so that the back-end can establish the
453 -- proper order of elaboration.
455 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
456 -- When compiling an instance of a child unit the parent (which is
457 -- itself an instance) is an enclosing scope that must be made
458 -- immediately visible. This procedure is also used to install the non-
459 -- generic parent of a generic child unit when compiling its body, so that
460 -- full views of types in the parent are made visible.
462 procedure Remove_Parent (In_Body : Boolean := False);
463 -- Reverse effect after instantiation of child is complete.
465 procedure Inline_Instance_Body
467 Gen_Unit : Entity_Id;
469 -- If front-end inlining is requested, instantiate the package body,
470 -- and preserve the visibility of its compilation unit, to insure
471 -- that successive instantiations succeed.
473 -- The functions Instantiate_XXX perform various legality checks and build
474 -- the declarations for instantiated generic parameters.
475 -- Need to describe what the parameters are ???
477 function Instantiate_Object
480 Analyzed_Formal : Node_Id)
483 function Instantiate_Type
486 Analyzed_Formal : Node_Id)
489 function Instantiate_Formal_Subprogram
492 Analyzed_Formal : Node_Id)
495 function Instantiate_Formal_Package
498 Analyzed_Formal : Node_Id)
500 -- If the formal package is declared with a box, special visibility rules
501 -- apply to its formals: they are in the visible part of the package. This
502 -- is true in the declarative region of the formal package, that is to say
503 -- in the enclosing generic or instantiation. For an instantiation, the
504 -- parameters of the formal package are made visible in an explicit step.
505 -- Furthermore, if the actual is a visible use_clause, these formals must
506 -- be made potentially use_visible as well. On exit from the enclosing
507 -- instantiation, the reverse must be done.
509 -- For a formal package declared without a box, there are conformance rules
510 -- that apply to the actuals in the generic declaration and the actuals of
511 -- the actual package in the enclosing instantiation. The simplest way to
512 -- apply these rules is to repeat the instantiation of the formal package
513 -- in the context of the enclosing instance, and compare the generic
514 -- associations of this instantiation with those of the actual package.
516 function Is_In_Main_Unit (N : Node_Id) return Boolean;
517 -- Test if given node is in the main unit
519 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
520 -- If the generic appears in a separate non-generic library unit,
521 -- load the corresponding body to retrieve the body of the generic.
522 -- N is the node for the generic instantiation, Spec is the generic
523 -- package declaration.
525 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
526 -- Add the context clause of the unit containing a generic unit to
527 -- an instantiation that is a compilation unit.
529 function Associated_Node (N : Node_Id) return Node_Id;
530 -- In order to propagate semantic information back from the analyzed
531 -- copy to the original generic, we maintain links between selected nodes
532 -- in the generic and their corresponding copies. At the end of generic
533 -- analysis, the routine Save_Global_References traverses the generic
534 -- tree, examines the semantic information, and preserves the links to
535 -- those nodes that contain global information. At instantiation, the
536 -- information from the associated node is placed on the new copy, so that
537 -- name resolution is not repeated.
538 -- Two kinds of nodes have associated nodes:
540 -- a) those that contain entities, that is to say identifiers, expanded_
541 -- names, and operators.
545 -- For the first class, the associated node preserves the entity if it is
546 -- global. If the generic contains nested instantiations, the associated_
547 -- node itself has been recopied, and a chain of them must be followed.
549 -- For aggregates, the associated node allows retrieval of the type, which
550 -- may otherwise not appear in the generic. The view of this type may be
551 -- different between generic and instantiation, and the full view can be
552 -- installed before the instantiation is analyzed. For aggregates of
553 -- type extensions, the same view exchange may have to be performed for
554 -- some of the ancestor types, if their view is private at the point of
557 -- The associated node is stored in Node4, using this field as a free
558 -- union in a fashion that should clearly be under control of sinfo ???
560 procedure Move_Freeze_Nodes
564 -- Freeze nodes can be generated in the analysis of a generic unit, but
565 -- will not be seen by the back-end. It is necessary to move those nodes
566 -- to the enclosing scope if they freeze an outer entity. We place them
567 -- at the end of the enclosing generic package, which is semantically
570 procedure Pre_Analyze_Actuals (N : Node_Id);
571 -- Analyze actuals to perform name resolution. Full resolution is done
572 -- later, when the expected types are known, but names have to be captured
573 -- before installing parents of generics, that are not visible for the
574 -- actuals themselves.
576 procedure Set_Associated_Node
578 Copy_Node : Node_Id);
579 -- Establish the link between an identifier in the generic unit, and the
580 -- corresponding node in the semantic copy.
582 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
583 -- Verify that an attribute that appears as the default for a formal
584 -- subprogram is a function or procedure with the correct profile.
586 -------------------------------------------
587 -- Data Structures for Generic Renamings --
588 -------------------------------------------
590 -- The map Generic_Renamings associates generic entities with their
591 -- corresponding actuals. Currently used to validate type instances.
592 -- It will eventually be used for all generic parameters to eliminate
593 -- the need for overload resolution in the instance.
595 type Assoc_Ptr is new Int;
597 Assoc_Null : constant Assoc_Ptr := -1;
602 Next_In_HTable : Assoc_Ptr;
605 package Generic_Renamings is new Table.Table
606 (Table_Component_Type => Assoc,
607 Table_Index_Type => Assoc_Ptr,
608 Table_Low_Bound => 0,
610 Table_Increment => 100,
611 Table_Name => "Generic_Renamings");
613 -- Variable to hold enclosing instantiation. When the environment is
614 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
616 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
618 -- Hash table for associations
620 HTable_Size : constant := 37;
621 type HTable_Range is range 0 .. HTable_Size - 1;
623 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
624 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
625 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
626 function Hash (F : Entity_Id) return HTable_Range;
628 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
629 Header_Num => HTable_Range,
631 Elmt_Ptr => Assoc_Ptr,
632 Null_Ptr => Assoc_Null,
633 Set_Next => Set_Next_Assoc,
636 Get_Key => Get_Gen_Id,
640 Exchanged_Views : Elist_Id;
641 -- This list holds the private views that have been exchanged during
642 -- instantiation to restore the visibility of the generic declaration.
643 -- (see comments above). After instantiation, the current visibility is
644 -- reestablished by means of a traversal of this list.
646 Hidden_Entities : Elist_Id;
647 -- This list holds the entities of the current scope that are removed
648 -- from immediate visibility when instantiating a child unit. Their
649 -- visibility is restored in Remove_Parent.
651 -- Because instantiations can be recursive, the following must be saved
652 -- on entry and restored on exit from an instantiation (spec or body).
653 -- This is done by the two procedures Save_Env and Restore_Env.
655 type Instance_Env is record
657 Instantiated_Parent : Assoc;
658 Exchanged_Views : Elist_Id;
659 Hidden_Entities : Elist_Id;
660 Current_Sem_Unit : Unit_Number_Type;
663 package Instance_Envs is new Table.Table (
664 Table_Component_Type => Instance_Env,
665 Table_Index_Type => Int,
666 Table_Low_Bound => 0,
668 Table_Increment => 100,
669 Table_Name => "Instance_Envs");
671 procedure Restore_Private_Views
672 (Pack_Id : Entity_Id;
673 Is_Package : Boolean := True);
674 -- Restore the private views of external types, and unmark the generic
675 -- renamings of actuals, so that they become comptible subtypes again.
676 -- For subprograms, Pack_Id is the package constructed to hold the
679 procedure Switch_View (T : Entity_Id);
680 -- Switch the partial and full views of a type and its private
681 -- dependents (i.e. its subtypes and derived types).
683 ------------------------------------
684 -- Structures for Error Reporting --
685 ------------------------------------
687 Instantiation_Node : Node_Id;
688 -- Used by subprograms that validate instantiation of formal parameters
689 -- where there might be no actual on which to place the error message.
690 -- Also used to locate the instantiation node for generic subunits.
692 Instantiation_Error : exception;
693 -- When there is a semantic error in the generic parameter matching,
694 -- there is no point in continuing the instantiation, because the
695 -- number of cascaded errors is unpredictable. This exception aborts
696 -- the instantiation process altogether.
698 S_Adjustment : Sloc_Adjustment;
699 -- Offset created for each node in an instantiation, in order to keep
700 -- track of the source position of the instantiation in each of its nodes.
701 -- A subsequent semantic error or warning on a construct of the instance
702 -- points to both places: the original generic node, and the point of
703 -- instantiation. See Sinput and Sinput.L for additional details.
705 ------------------------------------------------------------
706 -- Data structure for keeping track when inside a Generic --
707 ------------------------------------------------------------
709 -- The following table is used to save values of the Inside_A_Generic
710 -- flag (see spec of Sem) when they are saved by Start_Generic.
712 package Generic_Flags is new Table.Table (
713 Table_Component_Type => Boolean,
714 Table_Index_Type => Int,
715 Table_Low_Bound => 0,
717 Table_Increment => 200,
718 Table_Name => "Generic_Flags");
720 ---------------------------
721 -- Abandon_Instantiation --
722 ---------------------------
724 procedure Abandon_Instantiation (N : Node_Id) is
726 Error_Msg_N ("instantiation abandoned!", N);
727 raise Instantiation_Error;
728 end Abandon_Instantiation;
730 --------------------------
731 -- Analyze_Associations --
732 --------------------------
734 function Analyze_Associations
740 Actuals : List_Id := Generic_Associations (I_Node);
742 Actual_Types : Elist_Id := New_Elmt_List;
743 Assoc : List_Id := New_List;
745 Next_Formal : Node_Id;
746 Temp_Formal : Node_Id;
747 Analyzed_Formal : Node_Id;
748 Defaults : Elist_Id := New_Elmt_List;
751 First_Named : Node_Id := Empty;
752 Found_Assoc : Node_Id;
753 Is_Named_Assoc : Boolean;
754 Num_Matched : Int := 0;
755 Num_Actuals : Int := 0;
757 function Matching_Actual
761 -- Find actual that corresponds to a given a formal parameter. If the
762 -- actuals are positional, return the next one, if any. If the actuals
763 -- are named, scan the parameter associations to find the right one.
764 -- A_F is the corresponding entity in the analyzed generic,which is
765 -- placed on the selector name for ASIS use.
767 procedure Set_Analyzed_Formal;
768 -- Find the node in the generic copy that corresponds to a given formal.
769 -- The semantic information on this node is used to perform legality
770 -- checks on the actuals. Because semantic analysis can introduce some
771 -- anonymous entities or modify the declaration node itself, the
772 -- correspondence between the two lists is not one-one. In addition to
773 -- anonymous types, the presence a formal equality will introduce an
774 -- implicit declaration for the corresponding inequality.
776 ---------------------
777 -- Matching_Actual --
778 ---------------------
780 function Matching_Actual
789 Is_Named_Assoc := False;
791 -- End of list of purely positional parameters
796 -- Case of positional parameter corresponding to current formal
798 elsif No (Selector_Name (Actual)) then
799 Found := Explicit_Generic_Actual_Parameter (Actual);
800 Found_Assoc := Actual;
801 Num_Matched := Num_Matched + 1;
804 -- Otherwise scan list of named actuals to find the one with the
805 -- desired name. All remaining actuals have explicit names.
808 Is_Named_Assoc := True;
812 while Present (Actual) loop
813 if Chars (Selector_Name (Actual)) = Chars (F) then
814 Found := Explicit_Generic_Actual_Parameter (Actual);
815 Set_Entity (Selector_Name (Actual), A_F);
816 Set_Etype (Selector_Name (Actual), Etype (A_F));
817 Found_Assoc := Actual;
818 Num_Matched := Num_Matched + 1;
826 -- Reset for subsequent searches. In most cases the named
827 -- associations are in order. If they are not, we reorder them
828 -- to avoid scanning twice the same actual. This is not just a
829 -- question of efficiency: there may be multiple defaults with
830 -- boxes that have the same name. In a nested instantiation we
831 -- insert actuals for those defaults, and cannot rely on their
832 -- names to disambiguate them.
834 if Actual = First_Named then
837 elsif Present (Actual) then
838 Insert_Before (First_Named, Remove_Next (Prev));
841 Actual := First_Named;
847 -------------------------
848 -- Set_Analyzed_Formal --
849 -------------------------
851 procedure Set_Analyzed_Formal is
854 while Present (Analyzed_Formal) loop
855 Kind := Nkind (Analyzed_Formal);
857 case Nkind (Formal) is
859 when N_Formal_Subprogram_Declaration =>
860 exit when Kind = N_Formal_Subprogram_Declaration
863 (Defining_Unit_Name (Specification (Formal))) =
865 (Defining_Unit_Name (Specification (Analyzed_Formal)));
867 when N_Formal_Package_Declaration =>
869 Kind = N_Formal_Package_Declaration
871 Kind = N_Generic_Package_Declaration;
873 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
877 -- Skip freeze nodes, and nodes inserted to replace
878 -- unrecognized pragmas.
881 Kind /= N_Formal_Subprogram_Declaration
882 and then Kind /= N_Subprogram_Declaration
883 and then Kind /= N_Freeze_Entity
884 and then Kind /= N_Null_Statement
885 and then Kind /= N_Itype_Reference
886 and then Chars (Defining_Identifier (Formal)) =
887 Chars (Defining_Identifier (Analyzed_Formal));
890 Next (Analyzed_Formal);
893 end Set_Analyzed_Formal;
895 -- Start of processing for Analyze_Associations
898 -- If named associations are present, save the first named association
899 -- (it may of course be Empty) to facilitate subsequent name search.
901 if Present (Actuals) then
902 First_Named := First (Actuals);
904 while Present (First_Named)
905 and then No (Selector_Name (First_Named))
907 Num_Actuals := Num_Actuals + 1;
912 Named := First_Named;
913 while Present (Named) loop
914 if No (Selector_Name (Named)) then
915 Error_Msg_N ("invalid positional actual after named one", Named);
916 Abandon_Instantiation (Named);
919 Num_Actuals := Num_Actuals + 1;
923 if Present (Formals) then
924 Formal := First_Non_Pragma (Formals);
925 Analyzed_Formal := First_Non_Pragma (F_Copy);
927 if Present (Actuals) then
928 Actual := First (Actuals);
930 -- All formals should have default values
936 while Present (Formal) loop
938 Next_Formal := Next_Non_Pragma (Formal);
940 case Nkind (Formal) is
941 when N_Formal_Object_Declaration =>
944 Defining_Identifier (Formal),
945 Defining_Identifier (Analyzed_Formal));
948 (Instantiate_Object (Formal, Match, Analyzed_Formal),
951 when N_Formal_Type_Declaration =>
954 Defining_Identifier (Formal),
955 Defining_Identifier (Analyzed_Formal));
958 Error_Msg_NE ("missing actual for instantiation of &",
959 Instantiation_Node, Defining_Identifier (Formal));
960 Abandon_Instantiation (Instantiation_Node);
965 Instantiate_Type (Formal, Match, Analyzed_Formal));
967 -- an instantiation is a freeze point for the actuals,
968 -- unless this is a rewritten formal package.
970 if Nkind (I_Node) /= N_Formal_Package_Declaration then
971 Append_Elmt (Entity (Match), Actual_Types);
975 -- A remote access-to-class-wide type must not be an
976 -- actual parameter for a generic formal of an access
977 -- type (E.2.2 (17)).
979 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
981 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
982 N_Access_To_Object_Definition
984 Validate_Remote_Access_To_Class_Wide_Type (Match);
987 when N_Formal_Subprogram_Declaration =>
990 Defining_Unit_Name (Specification (Formal)),
991 Defining_Unit_Name (Specification (Analyzed_Formal)));
993 -- If the formal subprogram has the same name as
994 -- another formal subprogram of the generic, then
995 -- a named association is illegal (12.3(9)). Exclude
996 -- named associations that are generated for a nested
1000 and then Is_Named_Assoc
1001 and then Comes_From_Source (Found_Assoc)
1003 Temp_Formal := First (Formals);
1004 while Present (Temp_Formal) loop
1005 if Nkind (Temp_Formal) =
1006 N_Formal_Subprogram_Declaration
1007 and then Temp_Formal /= Formal
1009 Chars (Selector_Name (Found_Assoc)) =
1010 Chars (Defining_Unit_Name
1011 (Specification (Temp_Formal)))
1014 ("name not allowed for overloaded formal",
1016 Abandon_Instantiation (Instantiation_Node);
1024 Instantiate_Formal_Subprogram
1025 (Formal, Match, Analyzed_Formal));
1028 and then Box_Present (Formal)
1031 (Defining_Unit_Name (Specification (Last (Assoc))),
1035 when N_Formal_Package_Declaration =>
1038 Defining_Identifier (Formal),
1039 Defining_Identifier (Original_Node (Analyzed_Formal)));
1043 ("missing actual for instantiation of&",
1045 Defining_Identifier (Formal));
1047 Abandon_Instantiation (Instantiation_Node);
1052 (Instantiate_Formal_Package
1053 (Formal, Match, Analyzed_Formal),
1057 -- For use type and use package appearing in the context
1058 -- clause, we have already copied them, so we can just
1059 -- move them where they belong (we mustn't recopy them
1060 -- since this would mess up the Sloc values).
1062 when N_Use_Package_Clause |
1063 N_Use_Type_Clause =>
1065 Append (Formal, Assoc);
1068 raise Program_Error;
1072 Formal := Next_Formal;
1073 Next_Non_Pragma (Analyzed_Formal);
1076 if Num_Actuals > Num_Matched then
1078 ("unmatched actuals in instantiation", Instantiation_Node);
1081 elsif Present (Actuals) then
1083 ("too many actuals in generic instantiation", Instantiation_Node);
1087 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1090 while Present (Elmt) loop
1091 Freeze_Before (I_Node, Node (Elmt));
1096 -- If there are default subprograms, normalize the tree by adding
1097 -- explicit associations for them. This is required if the instance
1098 -- appears within a generic.
1106 Elmt := First_Elmt (Defaults);
1107 while Present (Elmt) loop
1108 if No (Actuals) then
1109 Actuals := New_List;
1110 Set_Generic_Associations (I_Node, Actuals);
1113 Subp := Node (Elmt);
1115 Make_Generic_Association (Sloc (Subp),
1116 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1117 Explicit_Generic_Actual_Parameter =>
1118 New_Occurrence_Of (Subp, Sloc (Subp)));
1119 Mark_Rewrite_Insertion (New_D);
1120 Append_To (Actuals, New_D);
1126 end Analyze_Associations;
1128 -------------------------------
1129 -- Analyze_Formal_Array_Type --
1130 -------------------------------
1132 procedure Analyze_Formal_Array_Type
1133 (T : in out Entity_Id;
1139 -- Treated like a non-generic array declaration, with
1140 -- additional semantic checks.
1144 if Nkind (Def) = N_Constrained_Array_Definition then
1145 DSS := First (Discrete_Subtype_Definitions (Def));
1146 while Present (DSS) loop
1147 if Nkind (DSS) = N_Subtype_Indication
1148 or else Nkind (DSS) = N_Range
1149 or else Nkind (DSS) = N_Attribute_Reference
1151 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1158 Array_Type_Declaration (T, Def);
1159 Set_Is_Generic_Type (Base_Type (T));
1161 if Ekind (Component_Type (T)) = E_Incomplete_Type
1162 and then No (Full_View (Component_Type (T)))
1164 Error_Msg_N ("premature usage of incomplete type", Def);
1166 elsif Is_Internal (Component_Type (T))
1167 and then Nkind (Original_Node (Subtype_Indication (Def)))
1168 /= N_Attribute_Reference
1171 ("only a subtype mark is allowed in a formal",
1172 Subtype_Indication (Def));
1175 end Analyze_Formal_Array_Type;
1177 ---------------------------------------------
1178 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1179 ---------------------------------------------
1181 -- As for other generic types, we create a valid type representation
1182 -- with legal but arbitrary attributes, whose values are never considered
1183 -- static. For all scalar types we introduce an anonymous base type, with
1184 -- the same attributes. We choose the corresponding integer type to be
1185 -- Standard_Integer.
1187 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1191 Loc : constant Source_Ptr := Sloc (Def);
1192 Base : constant Entity_Id :=
1194 (E_Decimal_Fixed_Point_Type,
1195 Current_Scope, Sloc (Def), 'G');
1196 Int_Base : constant Entity_Id := Standard_Integer;
1197 Delta_Val : constant Ureal := Ureal_1;
1198 Digs_Val : constant Uint := Uint_6;
1203 Set_Etype (Base, Base);
1204 Set_Size_Info (Base, Int_Base);
1205 Set_RM_Size (Base, RM_Size (Int_Base));
1206 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1207 Set_Digits_Value (Base, Digs_Val);
1208 Set_Delta_Value (Base, Delta_Val);
1209 Set_Small_Value (Base, Delta_Val);
1210 Set_Scalar_Range (Base,
1212 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1213 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1215 Set_Is_Generic_Type (Base);
1216 Set_Parent (Base, Parent (Def));
1218 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1219 Set_Etype (T, Base);
1220 Set_Size_Info (T, Int_Base);
1221 Set_RM_Size (T, RM_Size (Int_Base));
1222 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1223 Set_Digits_Value (T, Digs_Val);
1224 Set_Delta_Value (T, Delta_Val);
1225 Set_Small_Value (T, Delta_Val);
1226 Set_Scalar_Range (T, Scalar_Range (Base));
1228 end Analyze_Formal_Decimal_Fixed_Point_Type;
1230 ---------------------------------
1231 -- Analyze_Formal_Derived_Type --
1232 ---------------------------------
1234 procedure Analyze_Formal_Derived_Type
1239 Loc : constant Source_Ptr := Sloc (Def);
1241 Unk_Disc : Boolean := Unknown_Discriminants_Present (N);
1244 Set_Is_Generic_Type (T);
1246 if Private_Present (Def) then
1248 Make_Private_Extension_Declaration (Loc,
1249 Defining_Identifier => T,
1250 Discriminant_Specifications => Discriminant_Specifications (N),
1251 Unknown_Discriminants_Present => Unk_Disc,
1252 Subtype_Indication => Subtype_Mark (Def));
1254 Set_Abstract_Present (New_N, Abstract_Present (Def));
1258 Make_Full_Type_Declaration (Loc,
1259 Defining_Identifier => T,
1260 Discriminant_Specifications =>
1261 Discriminant_Specifications (Parent (T)),
1263 Make_Derived_Type_Definition (Loc,
1264 Subtype_Indication => Subtype_Mark (Def)));
1266 Set_Abstract_Present
1267 (Type_Definition (New_N), Abstract_Present (Def));
1274 if not Is_Composite_Type (T) then
1276 ("unknown discriminants not allowed for elementary types", N);
1278 Set_Has_Unknown_Discriminants (T);
1279 Set_Is_Constrained (T, False);
1283 -- If the parent type has a known size, so does the formal, which
1284 -- makes legal representation clauses that involve the formal.
1286 Set_Size_Known_At_Compile_Time
1287 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1289 end Analyze_Formal_Derived_Type;
1291 ----------------------------------
1292 -- Analyze_Formal_Discrete_Type --
1293 ----------------------------------
1295 -- The operations defined for a discrete types are those of an
1296 -- enumeration type. The size is set to an arbitrary value, for use
1297 -- in analyzing the generic unit.
1299 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1300 Loc : constant Source_Ptr := Sloc (Def);
1306 Set_Ekind (T, E_Enumeration_Type);
1311 -- For semantic analysis, the bounds of the type must be set to some
1312 -- non-static value. The simplest is to create attribute nodes for
1313 -- those bounds, that refer to the type itself. These bounds are never
1314 -- analyzed but serve as place-holders.
1317 Make_Attribute_Reference (Loc,
1318 Attribute_Name => Name_First,
1319 Prefix => New_Reference_To (T, Loc));
1323 Make_Attribute_Reference (Loc,
1324 Attribute_Name => Name_Last,
1325 Prefix => New_Reference_To (T, Loc));
1328 Set_Scalar_Range (T,
1333 end Analyze_Formal_Discrete_Type;
1335 ----------------------------------
1336 -- Analyze_Formal_Floating_Type --
1337 ---------------------------------
1339 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1340 Base : constant Entity_Id :=
1342 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1345 -- The various semantic attributes are taken from the predefined type
1346 -- Float, just so that all of them are initialized. Their values are
1347 -- never used because no constant folding or expansion takes place in
1348 -- the generic itself.
1351 Set_Ekind (T, E_Floating_Point_Subtype);
1352 Set_Etype (T, Base);
1353 Set_Size_Info (T, (Standard_Float));
1354 Set_RM_Size (T, RM_Size (Standard_Float));
1355 Set_Digits_Value (T, Digits_Value (Standard_Float));
1356 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1358 Set_Is_Generic_Type (Base);
1359 Set_Etype (Base, Base);
1360 Set_Size_Info (Base, (Standard_Float));
1361 Set_RM_Size (Base, RM_Size (Standard_Float));
1362 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1363 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1364 Set_Parent (Base, Parent (Def));
1365 end Analyze_Formal_Floating_Type;
1367 ---------------------------------
1368 -- Analyze_Formal_Modular_Type --
1369 ---------------------------------
1371 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1373 -- Apart from their entity kind, generic modular types are treated
1374 -- like signed integer types, and have the same attributes.
1376 Analyze_Formal_Signed_Integer_Type (T, Def);
1377 Set_Ekind (T, E_Modular_Integer_Subtype);
1378 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1380 end Analyze_Formal_Modular_Type;
1382 ---------------------------------------
1383 -- Analyze_Formal_Object_Declaration --
1384 ---------------------------------------
1386 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1387 E : constant Node_Id := Expression (N);
1388 Id : Node_Id := Defining_Identifier (N);
1395 -- Determine the mode of the formal object
1397 if Out_Present (N) then
1398 K := E_Generic_In_Out_Parameter;
1400 if not In_Present (N) then
1401 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1405 K := E_Generic_In_Parameter;
1408 Find_Type (Subtype_Mark (N));
1409 T := Entity (Subtype_Mark (N));
1411 if Ekind (T) = E_Incomplete_Type then
1412 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1415 if K = E_Generic_In_Parameter then
1416 if Is_Limited_Type (T) then
1418 ("generic formal of mode IN must not be of limited type", N);
1421 if Is_Abstract (T) then
1423 ("generic formal of mode IN must not be of abstract type", N);
1427 Analyze_Default_Expression (E, T);
1433 -- Case of generic IN OUT parameter.
1436 -- If the formal has an unconstrained type, construct its
1437 -- actual subtype, as is done for subprogram formals. In this
1438 -- fashion, all its uses can refer to specific bounds.
1443 if (Is_Array_Type (T)
1444 and then not Is_Constrained (T))
1446 (Ekind (T) = E_Record_Type
1447 and then Has_Discriminants (T))
1450 Non_Freezing_Ref : constant Node_Id :=
1451 New_Reference_To (Id, Sloc (Id));
1455 -- Make sure that the actual subtype doesn't generate
1458 Set_Must_Not_Freeze (Non_Freezing_Ref);
1459 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1460 Insert_Before_And_Analyze (N, Decl);
1461 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1464 Set_Actual_Subtype (Id, T);
1469 ("initialization not allowed for `IN OUT` formals", N);
1473 end Analyze_Formal_Object_Declaration;
1475 ----------------------------------------------
1476 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1477 ----------------------------------------------
1479 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1483 Loc : constant Source_Ptr := Sloc (Def);
1484 Base : constant Entity_Id :=
1486 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1488 -- The semantic attributes are set for completeness only, their
1489 -- values will never be used, because all properties of the type
1493 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1494 Set_Etype (T, Base);
1495 Set_Size_Info (T, Standard_Integer);
1496 Set_RM_Size (T, RM_Size (Standard_Integer));
1497 Set_Small_Value (T, Ureal_1);
1498 Set_Delta_Value (T, Ureal_1);
1499 Set_Scalar_Range (T,
1501 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1502 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1504 Set_Is_Generic_Type (Base);
1505 Set_Etype (Base, Base);
1506 Set_Size_Info (Base, Standard_Integer);
1507 Set_RM_Size (Base, RM_Size (Standard_Integer));
1508 Set_Small_Value (Base, Ureal_1);
1509 Set_Delta_Value (Base, Ureal_1);
1510 Set_Scalar_Range (Base, Scalar_Range (T));
1511 Set_Parent (Base, Parent (Def));
1512 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1514 ----------------------------
1515 -- Analyze_Formal_Package --
1516 ----------------------------
1518 procedure Analyze_Formal_Package (N : Node_Id) is
1519 Loc : constant Source_Ptr := Sloc (N);
1520 Formal : Entity_Id := Defining_Identifier (N);
1521 Gen_Id : constant Node_Id := Name (N);
1523 Gen_Unit : Entity_Id;
1525 Parent_Installed : Boolean := False;
1527 Parent_Instance : Entity_Id;
1528 Renaming_In_Par : Entity_Id;
1531 Text_IO_Kludge (Gen_Id);
1533 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1534 Gen_Unit := Entity (Gen_Id);
1536 if Ekind (Gen_Unit) /= E_Generic_Package then
1537 Error_Msg_N ("expect generic package name", Gen_Id);
1540 elsif Gen_Unit = Current_Scope then
1542 ("generic package cannot be used as a formal package of itself",
1547 -- Check for a formal package that is a package renaming.
1549 if Present (Renamed_Object (Gen_Unit)) then
1550 Gen_Unit := Renamed_Object (Gen_Unit);
1553 -- The formal package is treated like a regular instance, but only
1554 -- the specification needs to be instantiated, to make entities visible.
1556 if not Box_Present (N) then
1557 Hidden_Entities := New_Elmt_List;
1558 Analyze_Package_Instantiation (N);
1560 if Parent_Installed then
1565 -- If there are no generic associations, the generic parameters
1566 -- appear as local entities and are instantiated like them. We copy
1567 -- the generic package declaration as if it were an instantiation,
1568 -- and analyze it like a regular package, except that we treat the
1569 -- formals as additional visible components.
1571 Save_Env (Gen_Unit, Formal);
1573 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1575 if In_Extended_Main_Source_Unit (N) then
1576 Set_Is_Instantiated (Gen_Unit);
1577 Generate_Reference (Gen_Unit, N);
1582 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1583 Set_Defining_Unit_Name (Specification (New_N), Formal);
1586 Enter_Name (Formal);
1587 Set_Ekind (Formal, E_Generic_Package);
1588 Set_Etype (Formal, Standard_Void_Type);
1589 Set_Inner_Instances (Formal, New_Elmt_List);
1592 -- Within the formal, the name of the generic package is a renaming
1593 -- of the formal (as for a regular instantiation).
1595 Renaming := Make_Package_Renaming_Declaration (Loc,
1596 Defining_Unit_Name =>
1597 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1598 Name => New_Reference_To (Formal, Loc));
1600 if Present (Visible_Declarations (Specification (N))) then
1601 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1602 elsif Present (Private_Declarations (Specification (N))) then
1603 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1606 if Is_Child_Unit (Gen_Unit)
1607 and then Parent_Installed
1609 -- Similarly, we have to make the name of the formal visible in
1610 -- the parent instance, to resolve properly fully qualified names
1611 -- that may appear in the generic unit. The parent instance has
1612 -- been placed on the scope stack ahead of the current scope.
1614 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1617 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1618 Set_Ekind (Renaming_In_Par, E_Package);
1619 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1620 Set_Scope (Renaming_In_Par, Parent_Instance);
1621 Set_Parent (Renaming_In_Par, Parent (Formal));
1622 Set_Renamed_Object (Renaming_In_Par, Formal);
1623 Append_Entity (Renaming_In_Par, Parent_Instance);
1626 Analyze_Generic_Formal_Part (N);
1627 Analyze (Specification (N));
1628 End_Package_Scope (Formal);
1630 if Parent_Installed then
1636 -- Inside the generic unit, the formal package is a regular
1637 -- package, but no body is needed for it. Note that after
1638 -- instantiation, the defining_unit_name we need is in the
1639 -- new tree and not in the original. (see Package_Instantiation).
1640 -- A generic formal package is an instance, and can be used as
1641 -- an actual for an inner instance. Mark its generic parent.
1643 Set_Ekind (Formal, E_Package);
1644 Set_Generic_Parent (Specification (N), Gen_Unit);
1645 Set_Has_Completion (Formal, True);
1647 end Analyze_Formal_Package;
1649 ---------------------------------
1650 -- Analyze_Formal_Private_Type --
1651 ---------------------------------
1653 procedure Analyze_Formal_Private_Type
1659 New_Private_Type (N, T, Def);
1661 -- Set the size to an arbitrary but legal value.
1663 Set_Size_Info (T, Standard_Integer);
1664 Set_RM_Size (T, RM_Size (Standard_Integer));
1665 end Analyze_Formal_Private_Type;
1667 ----------------------------------------
1668 -- Analyze_Formal_Signed_Integer_Type --
1669 ----------------------------------------
1671 procedure Analyze_Formal_Signed_Integer_Type
1675 Base : constant Entity_Id :=
1677 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1682 Set_Ekind (T, E_Signed_Integer_Subtype);
1683 Set_Etype (T, Base);
1684 Set_Size_Info (T, Standard_Integer);
1685 Set_RM_Size (T, RM_Size (Standard_Integer));
1686 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1688 Set_Is_Generic_Type (Base);
1689 Set_Size_Info (Base, Standard_Integer);
1690 Set_RM_Size (Base, RM_Size (Standard_Integer));
1691 Set_Etype (Base, Base);
1692 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1693 Set_Parent (Base, Parent (Def));
1694 end Analyze_Formal_Signed_Integer_Type;
1696 -------------------------------
1697 -- Analyze_Formal_Subprogram --
1698 -------------------------------
1700 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1701 Spec : constant Node_Id := Specification (N);
1702 Def : constant Node_Id := Default_Name (N);
1703 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1707 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1708 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1712 Analyze_Subprogram_Declaration (N);
1713 Set_Is_Formal_Subprogram (Nam);
1714 Set_Has_Completion (Nam);
1716 -- Default name is resolved at the point of instantiation
1718 if Box_Present (N) then
1721 -- Else default is bound at the point of generic declaration
1723 elsif Present (Def) then
1724 if Nkind (Def) = N_Operator_Symbol then
1725 Find_Direct_Name (Def);
1727 elsif Nkind (Def) /= N_Attribute_Reference then
1731 -- For an attribute reference, analyze the prefix and verify
1732 -- that it has the proper profile for the subprogram.
1734 Analyze (Prefix (Def));
1735 Valid_Default_Attribute (Nam, Def);
1739 -- Default name may be overloaded, in which case the interpretation
1740 -- with the correct profile must be selected, as for a renaming.
1742 if Etype (Def) = Any_Type then
1745 elsif Nkind (Def) = N_Selected_Component then
1746 Subp := Entity (Selector_Name (Def));
1748 if Ekind (Subp) /= E_Entry then
1749 Error_Msg_N ("expect valid subprogram name as default", Def);
1753 elsif Nkind (Def) = N_Indexed_Component then
1755 if Nkind (Prefix (Def)) /= N_Selected_Component then
1756 Error_Msg_N ("expect valid subprogram name as default", Def);
1760 Subp := Entity (Selector_Name (Prefix (Def)));
1762 if Ekind (Subp) /= E_Entry_Family then
1763 Error_Msg_N ("expect valid subprogram name as default", Def);
1768 elsif Nkind (Def) = N_Character_Literal then
1770 -- Needs some type checks: subprogram should be parameterless???
1772 Resolve (Def, (Etype (Nam)));
1774 elsif (not Is_Entity_Name (Def)
1775 or else not Is_Overloadable (Entity (Def)))
1777 Error_Msg_N ("expect valid subprogram name as default", Def);
1780 elsif not Is_Overloaded (Def) then
1781 Subp := Entity (Def);
1784 Error_Msg_N ("premature usage of formal subprogram", Def);
1786 elsif not Entity_Matches_Spec (Subp, Nam) then
1787 Error_Msg_N ("no visible entity matches specification", Def);
1793 I1 : Interp_Index := 0;
1799 Get_First_Interp (Def, I, It);
1800 while Present (It.Nam) loop
1802 if Entity_Matches_Spec (It.Nam, Nam) then
1803 if Subp /= Any_Id then
1804 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1806 if It1 = No_Interp then
1807 Error_Msg_N ("ambiguous default subprogram", Def);
1820 Get_Next_Interp (I, It);
1824 if Subp /= Any_Id then
1825 Set_Entity (Def, Subp);
1828 Error_Msg_N ("premature usage of formal subprogram", Def);
1830 elsif Ekind (Subp) /= E_Operator then
1831 Check_Mode_Conformant (Subp, Nam);
1835 Error_Msg_N ("no visible subprogram matches specification", N);
1839 end Analyze_Formal_Subprogram;
1841 -------------------------------------
1842 -- Analyze_Formal_Type_Declaration --
1843 -------------------------------------
1845 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1846 Def : constant Node_Id := Formal_Type_Definition (N);
1850 T := Defining_Identifier (N);
1852 if Present (Discriminant_Specifications (N))
1853 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1856 ("discriminants not allowed for this formal type",
1857 Defining_Identifier (First (Discriminant_Specifications (N))));
1860 -- Enter the new name, and branch to specific routine.
1863 when N_Formal_Private_Type_Definition
1864 => Analyze_Formal_Private_Type (N, T, Def);
1866 when N_Formal_Derived_Type_Definition
1867 => Analyze_Formal_Derived_Type (N, T, Def);
1869 when N_Formal_Discrete_Type_Definition
1870 => Analyze_Formal_Discrete_Type (T, Def);
1872 when N_Formal_Signed_Integer_Type_Definition
1873 => Analyze_Formal_Signed_Integer_Type (T, Def);
1875 when N_Formal_Modular_Type_Definition
1876 => Analyze_Formal_Modular_Type (T, Def);
1878 when N_Formal_Floating_Point_Definition
1879 => Analyze_Formal_Floating_Type (T, Def);
1881 when N_Formal_Ordinary_Fixed_Point_Definition
1882 => Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1884 when N_Formal_Decimal_Fixed_Point_Definition
1885 => Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1887 when N_Array_Type_Definition
1888 => Analyze_Formal_Array_Type (T, Def);
1890 when N_Access_To_Object_Definition |
1891 N_Access_Function_Definition |
1892 N_Access_Procedure_Definition
1893 => Analyze_Generic_Access_Type (T, Def);
1896 raise Program_Error;
1900 Set_Is_Generic_Type (T);
1902 end Analyze_Formal_Type_Declaration;
1904 ------------------------------------
1905 -- Analyze_Function_Instantiation --
1906 ------------------------------------
1908 procedure Analyze_Function_Instantiation (N : Node_Id) is
1910 Analyze_Subprogram_Instantiation (N, E_Function);
1911 end Analyze_Function_Instantiation;
1913 ---------------------------------
1914 -- Analyze_Generic_Access_Type --
1915 ---------------------------------
1917 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
1921 if Nkind (Def) = N_Access_To_Object_Definition then
1922 Access_Type_Declaration (T, Def);
1924 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
1925 and then No (Full_View (Designated_Type (T)))
1926 and then not Is_Generic_Type (Designated_Type (T))
1928 Error_Msg_N ("premature usage of incomplete type", Def);
1930 elsif Is_Internal (Designated_Type (T)) then
1932 ("only a subtype mark is allowed in a formal", Def);
1936 Access_Subprogram_Declaration (T, Def);
1938 end Analyze_Generic_Access_Type;
1940 ---------------------------------
1941 -- Analyze_Generic_Formal_Part --
1942 ---------------------------------
1944 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
1945 Gen_Parm_Decl : Node_Id;
1948 -- The generic formals are processed in the scope of the generic
1949 -- unit, where they are immediately visible. The scope is installed
1952 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
1954 while Present (Gen_Parm_Decl) loop
1955 Analyze (Gen_Parm_Decl);
1956 Next (Gen_Parm_Decl);
1958 end Analyze_Generic_Formal_Part;
1960 ------------------------------------------
1961 -- Analyze_Generic_Package_Declaration --
1962 ------------------------------------------
1964 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
1967 Save_Parent : Node_Id;
1970 -- Create copy of generic unit, and save for instantiation.
1971 -- If the unit is a child unit, do not copy the specifications
1972 -- for the parent, which are not part of the generic tree.
1974 Save_Parent := Parent_Spec (N);
1975 Set_Parent_Spec (N, Empty);
1977 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
1978 Set_Parent_Spec (New_N, Save_Parent);
1980 Id := Defining_Entity (N);
1981 Generate_Definition (Id);
1983 -- Expansion is not applied to generic units.
1988 Set_Ekind (Id, E_Generic_Package);
1989 Set_Etype (Id, Standard_Void_Type);
1991 Enter_Generic_Scope (Id);
1992 Set_Inner_Instances (Id, New_Elmt_List);
1994 Set_Categorization_From_Pragmas (N);
1995 Set_Is_Pure (Id, Is_Pure (Current_Scope));
1997 -- For a library unit, we have reconstructed the entity for the
1998 -- unit, and must reset it in the library tables.
2000 if Nkind (Parent (N)) = N_Compilation_Unit then
2001 Set_Cunit_Entity (Current_Sem_Unit, Id);
2004 Analyze_Generic_Formal_Part (N);
2006 -- After processing the generic formals, analysis proceeds
2007 -- as for a non-generic package.
2009 Analyze (Specification (N));
2011 Validate_Categorization_Dependency (N, Id);
2015 End_Package_Scope (Id);
2016 Exit_Generic_Scope (Id);
2018 if Nkind (Parent (N)) /= N_Compilation_Unit then
2019 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2020 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2021 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2024 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2025 Validate_RT_RAT_Component (N);
2028 end Analyze_Generic_Package_Declaration;
2030 --------------------------------------------
2031 -- Analyze_Generic_Subprogram_Declaration --
2032 --------------------------------------------
2034 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2039 Save_Parent : Node_Id;
2042 -- Create copy of generic unit,and save for instantiation.
2043 -- If the unit is a child unit, do not copy the specifications
2044 -- for the parent, which are not part of the generic tree.
2046 Save_Parent := Parent_Spec (N);
2047 Set_Parent_Spec (N, Empty);
2049 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2050 Set_Parent_Spec (New_N, Save_Parent);
2053 Spec := Specification (N);
2054 Id := Defining_Entity (Spec);
2055 Generate_Definition (Id);
2057 if Nkind (Id) = N_Defining_Operator_Symbol then
2059 ("operator symbol not allowed for generic subprogram", Id);
2067 Set_Inner_Instances (Id, New_Elmt_List);
2068 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2070 Analyze_Generic_Formal_Part (N);
2072 Formals := Parameter_Specifications (Spec);
2074 if Present (Formals) then
2075 Process_Formals (Id, Formals, Spec);
2078 if Nkind (Spec) = N_Function_Specification then
2079 Set_Ekind (Id, E_Generic_Function);
2080 Find_Type (Subtype_Mark (Spec));
2081 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2083 Set_Ekind (Id, E_Generic_Procedure);
2084 Set_Etype (Id, Standard_Void_Type);
2087 -- For a library unit, we have reconstructed the entity for the
2088 -- unit, and must reset it in the library tables. We also need
2089 -- to make sure that Body_Required is set properly in the original
2090 -- compilation unit node.
2092 if Nkind (Parent (N)) = N_Compilation_Unit then
2093 Set_Cunit_Entity (Current_Sem_Unit, Id);
2094 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2097 Set_Categorization_From_Pragmas (N);
2098 Validate_Categorization_Dependency (N, Id);
2100 Save_Global_References (Original_Node (N));
2105 end Analyze_Generic_Subprogram_Declaration;
2107 -----------------------------------
2108 -- Analyze_Package_Instantiation --
2109 -----------------------------------
2111 -- Note: this procedure is also used for formal package declarations,
2112 -- in which case the argument N is an N_Formal_Package_Declaration
2113 -- node. This should really be noted in the spec! ???
2115 procedure Analyze_Package_Instantiation (N : Node_Id) is
2116 Loc : constant Source_Ptr := Sloc (N);
2117 Gen_Id : constant Node_Id := Name (N);
2120 Act_Decl_Name : Node_Id;
2121 Act_Decl_Id : Entity_Id;
2126 Gen_Unit : Entity_Id;
2128 Is_Actual_Pack : Boolean := Is_Internal (Defining_Entity (N));
2129 Parent_Installed : Boolean := False;
2130 Renaming_List : List_Id;
2131 Unit_Renaming : Node_Id;
2132 Needs_Body : Boolean;
2133 Inline_Now : Boolean := False;
2135 procedure Delay_Descriptors (E : Entity_Id);
2136 -- Delay generation of subprogram descriptors for given entity
2138 function Might_Inline_Subp return Boolean;
2139 -- If inlining is active and the generic contains inlined subprograms,
2140 -- we instantiate the body. This may cause superfluous instantiations,
2141 -- but it is simpler than detecting the need for the body at the point
2142 -- of inlining, when the context of the instance is not available.
2144 -----------------------
2145 -- Delay_Descriptors --
2146 -----------------------
2148 procedure Delay_Descriptors (E : Entity_Id) is
2150 if not Delay_Subprogram_Descriptors (E) then
2151 Set_Delay_Subprogram_Descriptors (E);
2152 Pending_Descriptor.Increment_Last;
2153 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2155 end Delay_Descriptors;
2157 -----------------------
2158 -- Might_Inline_Subp --
2159 -----------------------
2161 function Might_Inline_Subp return Boolean is
2165 if not Inline_Processing_Required then
2169 E := First_Entity (Gen_Unit);
2171 while Present (E) loop
2173 if Is_Subprogram (E)
2174 and then Is_Inlined (E)
2184 end Might_Inline_Subp;
2186 -- Start of processing for Analyze_Package_Instantiation
2189 -- Very first thing: apply the special kludge for Text_IO processing
2190 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2192 Text_IO_Kludge (Name (N));
2194 -- Make node global for error reporting.
2196 Instantiation_Node := N;
2198 -- Case of instantiation of a generic package
2200 if Nkind (N) = N_Package_Instantiation then
2201 Act_Decl_Id := New_Copy (Defining_Entity (N));
2202 Set_Comes_From_Source (Act_Decl_Id, True);
2204 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2206 Make_Defining_Program_Unit_Name (Loc,
2207 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2208 Defining_Identifier => Act_Decl_Id);
2210 Act_Decl_Name := Act_Decl_Id;
2213 -- Case of instantiation of a formal package
2216 Act_Decl_Id := Defining_Identifier (N);
2217 Act_Decl_Name := Act_Decl_Id;
2220 Generate_Definition (Act_Decl_Id);
2221 Pre_Analyze_Actuals (N);
2223 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2224 Gen_Unit := Entity (Gen_Id);
2226 -- Verify that it is the name of a generic package
2228 if Etype (Gen_Unit) = Any_Type then
2231 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2233 ("expect name of generic package in instantiation", Gen_Id);
2237 if In_Extended_Main_Source_Unit (N) then
2238 Set_Is_Instantiated (Gen_Unit);
2239 Generate_Reference (Gen_Unit, N);
2241 if Present (Renamed_Object (Gen_Unit)) then
2242 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2243 Generate_Reference (Renamed_Object (Gen_Unit), N);
2247 if Nkind (Gen_Id) = N_Identifier
2248 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2251 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2253 elsif Nkind (Gen_Id) = N_Expanded_Name
2254 and then Is_Child_Unit (Gen_Unit)
2255 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2256 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2259 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2262 -- If renaming, indicate this is an instantiation of renamed unit.
2264 if Present (Renamed_Object (Gen_Unit))
2265 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2267 Gen_Unit := Renamed_Object (Gen_Unit);
2268 Set_Entity (Gen_Id, Gen_Unit);
2271 -- Verify that there are no circular instantiations.
2273 if In_Open_Scopes (Gen_Unit) then
2274 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2277 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2278 Error_Msg_Node_2 := Current_Scope;
2280 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2281 Circularity_Detected := True;
2285 Save_Env (Gen_Unit, Act_Decl_Id);
2286 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2288 -- Initialize renamings map, for error checking, and the list
2289 -- that holds private entities whose views have changed between
2290 -- generic definition and instantiation. If this is the instance
2291 -- created to validate an actual package, the instantiation
2292 -- environment is that of the enclosing instance.
2294 Generic_Renamings.Set_Last (0);
2295 Generic_Renamings_HTable.Reset;
2297 Create_Instantiation_Source (N, Gen_Unit, S_Adjustment);
2299 -- Copy original generic tree, to produce text for instantiation.
2303 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2305 Act_Spec := Specification (Act_Tree);
2307 -- If this is the instance created to validate an actual package,
2308 -- only the formals matter, do not examine the package spec itself.
2310 if Is_Actual_Pack then
2311 Set_Visible_Declarations (Act_Spec, New_List);
2312 Set_Private_Declarations (Act_Spec, New_List);
2316 Analyze_Associations
2318 Generic_Formal_Declarations (Act_Tree),
2319 Generic_Formal_Declarations (Gen_Decl));
2321 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2322 Set_Is_Generic_Instance (Act_Decl_Id);
2324 Set_Generic_Parent (Act_Spec, Gen_Unit);
2326 -- References to the generic in its own declaration or its body
2327 -- are references to the instance. Add a renaming declaration for
2328 -- the generic unit itself. This declaration, as well as the renaming
2329 -- declarations for the generic formals, must remain private to the
2330 -- unit: the formals, because this is the language semantics, and
2331 -- the unit because its use is an artifact of the implementation.
2334 Make_Package_Renaming_Declaration (Loc,
2335 Defining_Unit_Name =>
2336 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2337 Name => New_Reference_To (Act_Decl_Id, Loc));
2339 Append (Unit_Renaming, Renaming_List);
2341 -- The renaming declarations are the first local declarations of
2344 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2346 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2348 Set_Visible_Declarations (Act_Spec, Renaming_List);
2352 Make_Package_Declaration (Loc,
2353 Specification => Act_Spec);
2355 -- Save the instantiation node, for subsequent instantiation
2356 -- of the body, if there is one and we are generating code for
2357 -- the current unit. Mark the unit as having a body, to avoid
2358 -- a premature error message.
2360 -- We instantiate the body if we are generating code, if we are
2361 -- generating cross-reference information, or if we are building
2362 -- trees for ASIS use.
2365 Enclosing_Body_Present : Boolean := False;
2369 if Scope (Gen_Unit) /= Standard_Standard
2370 and then not Is_Child_Unit (Gen_Unit)
2372 Scop := Scope (Gen_Unit);
2374 while Present (Scop)
2375 and then Scop /= Standard_Standard
2377 if Unit_Requires_Body (Scop) then
2378 Enclosing_Body_Present := True;
2382 Scop := Scope (Scop);
2386 -- If front-end inlining is enabled, and this is a unit for which
2387 -- code will be generated, we instantiate the body at once.
2388 -- This is done if the instance is not the main unit, and if the
2389 -- generic is not a child unit, to avoid scope problems.
2391 if Front_End_Inlining
2392 and then Expander_Active
2393 and then not Is_Child_Unit (Gen_Unit)
2394 and then Is_In_Main_Unit (N)
2395 and then Nkind (Parent (N)) /= N_Compilation_Unit
2396 and then Might_Inline_Subp
2402 (Unit_Requires_Body (Gen_Unit)
2403 or else Enclosing_Body_Present
2404 or else Present (Corresponding_Body (Gen_Decl)))
2405 and then (Is_In_Main_Unit (N)
2406 or else Might_Inline_Subp)
2407 and then not Is_Actual_Pack
2408 and then not Inline_Now
2410 and then (Operating_Mode = Generate_Code
2411 or else (Operating_Mode = Check_Semantics
2412 and then Tree_Output));
2414 -- If front_end_inlining is enabled, do not instantiate a
2415 -- body if within a generic context.
2417 if Front_End_Inlining
2418 and then not Expander_Active
2420 Needs_Body := False;
2425 -- If we are generating the calling stubs from the instantiation
2426 -- of a generic RCI package, we will not use the body of the
2429 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2430 and then Is_Compilation_Unit (Defining_Entity (N))
2432 Needs_Body := False;
2437 -- Here is a defence against a ludicrous number of instantiations
2438 -- caused by a circular set of instantiation attempts.
2440 if Pending_Instantiations.Last >
2441 Hostparm.Max_Instantiations
2443 Error_Msg_N ("too many instantiations", N);
2444 raise Unrecoverable_Error;
2447 -- Indicate that the enclosing scopes contain an instantiation,
2448 -- and that cleanup actions should be delayed until after the
2449 -- instance body is expanded.
2451 Check_Forward_Instantiation (N, Gen_Decl);
2452 if Nkind (N) = N_Package_Instantiation then
2454 Enclosing_Master : Entity_Id := Current_Scope;
2457 while Enclosing_Master /= Standard_Standard loop
2459 if Ekind (Enclosing_Master) = E_Package then
2460 if Is_Compilation_Unit (Enclosing_Master) then
2461 if In_Package_Body (Enclosing_Master) then
2463 (Body_Entity (Enclosing_Master));
2472 Enclosing_Master := Scope (Enclosing_Master);
2475 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2476 Enclosing_Master := Scope (Enclosing_Master);
2478 elsif Ekind (Enclosing_Master) = E_Generic_Function
2479 or else Ekind (Enclosing_Master) = E_Generic_Procedure
2480 or else Ekind (Enclosing_Master) = E_Void
2482 -- Cleanup actions will eventually be performed on
2483 -- the enclosing instance, if any. enclosing scope
2484 -- is void in the formal part of a generic subp.
2489 if Ekind (Enclosing_Master) = E_Entry
2491 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2494 Protected_Body_Subprogram (Enclosing_Master);
2497 Set_Delay_Cleanups (Enclosing_Master);
2499 while Ekind (Enclosing_Master) = E_Block loop
2500 Enclosing_Master := Scope (Enclosing_Master);
2503 if Is_Subprogram (Enclosing_Master) then
2504 Delay_Descriptors (Enclosing_Master);
2506 elsif Is_Task_Type (Enclosing_Master) then
2508 TBP : constant Node_Id :=
2509 Get_Task_Body_Procedure
2513 if Present (TBP) then
2514 Delay_Descriptors (TBP);
2515 Set_Delay_Cleanups (TBP);
2525 -- Make entry in table
2527 Pending_Instantiations.Increment_Last;
2528 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2529 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2533 Set_Categorization_From_Pragmas (Act_Decl);
2535 if Parent_Installed then
2539 Set_Instance_Spec (N, Act_Decl);
2541 -- Case of not a compilation unit
2543 if Nkind (Parent (N)) /= N_Compilation_Unit then
2544 Mark_Rewrite_Insertion (Act_Decl);
2545 Insert_Before (N, Act_Decl);
2548 -- Case of compilation unit that is generic instantiation
2550 -- Place declaration on current node so context is complete
2551 -- for analysis (including nested instantiations).
2554 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2556 -- The entity for the current unit is the newly created one,
2557 -- and all semantic information is attached to it.
2559 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2561 -- If this is the main unit, replace the main entity as well.
2563 if Current_Sem_Unit = Main_Unit then
2564 Main_Unit_Entity := Act_Decl_Id;
2568 Set_Unit (Parent (N), Act_Decl);
2569 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2571 Set_Unit (Parent (N), N);
2572 Set_Body_Required (Parent (N), False);
2574 -- We never need elaboration checks on instantiations, since
2575 -- by definition, the body instantiation is elaborated at the
2576 -- same time as the spec instantiation.
2578 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2579 Set_Suppress_Elaboration_Checks (Act_Decl_Id);
2582 Check_Elab_Instantiation (N);
2584 if ABE_Is_Certain (N) and then Needs_Body then
2585 Pending_Instantiations.Decrement_Last;
2587 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2589 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2590 First_Private_Entity (Act_Decl_Id));
2592 if Nkind (Parent (N)) = N_Compilation_Unit
2593 and then not Needs_Body
2595 Rewrite (N, Act_Decl);
2598 if Present (Corresponding_Body (Gen_Decl))
2599 or else Unit_Requires_Body (Gen_Unit)
2601 Set_Has_Completion (Act_Decl_Id);
2604 Check_Formal_Packages (Act_Decl_Id);
2606 Restore_Private_Views (Act_Decl_Id);
2608 if not Generic_Separately_Compiled (Gen_Unit) then
2609 Inherit_Context (Gen_Decl, N);
2612 if Parent_Installed then
2619 Validate_Categorization_Dependency (N, Act_Decl_Id);
2621 -- Check restriction, but skip this if something went wrong in
2622 -- the above analysis, indicated by Act_Decl_Id being void.
2624 if Ekind (Act_Decl_Id) /= E_Void
2625 and then not Is_Library_Level_Entity (Act_Decl_Id)
2627 Check_Restriction (No_Local_Allocators, N);
2631 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2635 when Instantiation_Error =>
2636 if Parent_Installed then
2640 end Analyze_Package_Instantiation;
2642 ---------------------------
2643 -- Inline_Instance_Body --
2644 ---------------------------
2646 procedure Inline_Instance_Body
2648 Gen_Unit : Entity_Id;
2652 Gen_Comp : constant Entity_Id :=
2653 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2654 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2655 Curr_Scope : Entity_Id := Empty;
2656 Curr_Unit : constant Entity_Id :=
2657 Cunit_Entity (Current_Sem_Unit);
2658 Removed : Boolean := False;
2659 Num_Scopes : Int := 0;
2660 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2661 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2662 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2663 Num_Inner : Int := 0;
2664 N_Instances : Int := 0;
2668 -- Case of generic unit defined in another unit
2670 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2671 Vis := Is_Immediately_Visible (Gen_Comp);
2676 and then S /= Standard_Standard
2678 Num_Scopes := Num_Scopes + 1;
2680 Use_Clauses (Num_Scopes) :=
2682 (Scope_Stack.Last - Num_Scopes + 1).
2684 End_Use_Clauses (Use_Clauses (Num_Scopes));
2686 exit when Is_Generic_Instance (S)
2687 and then (In_Package_Body (S)
2688 or else Ekind (S) = E_Procedure
2689 or else Ekind (S) = E_Function);
2693 -- Find and save all enclosing instances.
2698 and then S /= Standard_Standard
2700 if Is_Generic_Instance (S) then
2701 N_Instances := N_Instances + 1;
2702 Instances (N_Instances) := S;
2708 -- Remove context of current compilation unit, unless we
2709 -- are within a nested package instantiation, in which case
2710 -- the context has been removed previously.
2711 -- If current scope is the body of a child unit, remove context
2717 and then S /= Standard_Standard
2719 exit when Is_Generic_Instance (S)
2720 and then In_Package_Body (S);
2723 or else (Ekind (Curr_Unit) = E_Package_Body
2724 and then S = Spec_Entity (Curr_Unit))
2728 if Is_Child_Unit (S) then
2729 -- Remove child unit from stack, as well as inner scopes.
2730 -- Removing its context of child unit will remove parent
2733 while Current_Scope /= S loop
2734 Num_Inner := Num_Inner + 1;
2735 Inner_Scopes (Num_Inner) := Current_Scope;
2740 Remove_Context (Curr_Comp);
2744 Remove_Context (Curr_Comp);
2747 if Ekind (Curr_Unit) = E_Package_Body then
2748 Remove_Context (Library_Unit (Curr_Comp));
2755 Instantiate_Package_Body
2756 ((N, Act_Decl, Expander_Active, Current_Sem_Unit));
2760 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2762 -- Reset Generic_Instance flag so that use clauses can be installed
2763 -- in the proper order. (See Use_One_Package for effect of enclosing
2764 -- instances on processing of use clauses).
2766 for J in 1 .. N_Instances loop
2767 Set_Is_Generic_Instance (Instances (J), False);
2771 -- Make local entities not visible, so that when the context of
2772 -- unit is restored, there are not spurious hidings of use-
2773 -- visible entities (which appear in the environment before the
2776 if Current_Scope /= Standard_Standard then
2777 S := First_Entity (Current_Scope);
2779 while Present (S) loop
2780 if Is_Overloadable (S) then
2781 Set_Is_Immediately_Visible (S, False);
2788 Install_Context (Curr_Comp);
2790 if Current_Scope /= Standard_Standard then
2791 S := First_Entity (Current_Scope);
2793 while Present (S) loop
2794 if Is_Overloadable (S) then
2795 Set_Is_Immediately_Visible (S);
2802 if Present (Curr_Scope)
2803 and then Is_Child_Unit (Curr_Scope)
2805 New_Scope (Curr_Scope);
2806 Set_Is_Immediately_Visible (Curr_Scope);
2808 -- Finally, restore inner scopes as well.
2810 for J in reverse 1 .. Num_Inner loop
2811 New_Scope (Inner_Scopes (J));
2816 for J in reverse 1 .. Num_Scopes loop
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
3239 end Analyze_Subprogram_Instantiation;
3241 ---------------------
3242 -- Associated_Node --
3243 ---------------------
3245 function Associated_Node (N : Node_Id) return Node_Id is
3246 Assoc : Node_Id := Node4 (N);
3247 -- ??? what is Node4 being used for here?
3250 if Nkind (Assoc) /= Nkind (N) then
3253 elsif Nkind (Assoc) = N_Aggregate
3254 or else Nkind (Assoc) = N_Extension_Aggregate
3258 -- If the node is part of an inner generic, it may itself have been
3259 -- remapped into a further generic copy. Node4 is otherwise used for
3260 -- the entity of the node, and will be of a different node kind, or
3261 -- else N has been rewritten as a literal or function call.
3263 while Present (Node4 (Assoc))
3264 and then Nkind (Node4 (Assoc)) = Nkind (Assoc)
3266 Assoc := Node4 (Assoc);
3269 -- Follow and additional link in case the final node was rewritten.
3270 -- This can only happen with nested generic units.
3272 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3273 and then Present (Node4 (Assoc))
3274 and then (Nkind (Node4 (Assoc)) = N_Function_Call
3275 or else Nkind (Node4 (Assoc)) = N_Explicit_Dereference
3276 or else Nkind (Node4 (Assoc)) = N_Integer_Literal
3277 or else Nkind (Node4 (Assoc)) = N_Real_Literal
3278 or else Nkind (Node4 (Assoc)) = N_String_Literal)
3280 Assoc := Node4 (Assoc);
3285 end Associated_Node;
3287 -------------------------------------------
3288 -- Build_Instance_Compilation_Unit_Nodes --
3289 -------------------------------------------
3291 procedure Build_Instance_Compilation_Unit_Nodes
3296 Decl_Cunit : Node_Id;
3297 Body_Cunit : Node_Id;
3299 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3300 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3303 -- A new compilation unit node is built for the instance declaration
3306 Make_Compilation_Unit (Sloc (N),
3307 Context_Items => Empty_List,
3310 Make_Compilation_Unit_Aux (Sloc (N)));
3312 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3313 Set_Body_Required (Decl_Cunit, True);
3315 -- We use the original instantiation compilation unit as the resulting
3316 -- compilation unit of the instance, since this is the main unit.
3318 Rewrite (N, Act_Body);
3319 Body_Cunit := Parent (N);
3321 -- The two compilation unit nodes are linked by the Library_Unit field
3323 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3324 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3326 -- The context clause items on the instantiation, which are now
3327 -- attached to the body compilation unit (since the body overwrote
3328 -- the original instantiation node), semantically belong on the spec,
3329 -- so copy them there. It's harmless to leave them on the body as well.
3330 -- In fact one could argue that they belong in both places.
3332 Citem := First (Context_Items (Body_Cunit));
3333 while Present (Citem) loop
3334 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3338 -- Propagate categorization flags on packages, so that they appear
3339 -- in ali file for the spec of the unit.
3341 if Ekind (New_Main) = E_Package then
3342 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3343 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3344 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3345 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3346 Set_Is_Remote_Call_Interface
3347 (Old_Main, Is_Remote_Call_Interface (New_Main));
3350 -- Make entry in Units table, so that binder can generate call to
3351 -- elaboration procedure for body, if any.
3353 Make_Instance_Unit (Body_Cunit);
3354 Main_Unit_Entity := New_Main;
3355 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3357 -- Build elaboration entity, since the instance may certainly
3358 -- generate elaboration code requiring a flag for protection.
3360 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3361 end Build_Instance_Compilation_Unit_Nodes;
3363 -----------------------------------
3364 -- Check_Formal_Package_Instance --
3365 -----------------------------------
3367 -- If the formal has specific parameters, they must match those of the
3368 -- actual. Both of them are instances, and the renaming declarations
3369 -- for their formal parameters appear in the same order in both. The
3370 -- analyzed formal has been analyzed in the context of the current
3373 procedure Check_Formal_Package_Instance
3374 (Formal_Pack : Entity_Id;
3375 Actual_Pack : Entity_Id)
3377 E1 : Entity_Id := First_Entity (Actual_Pack);
3378 E2 : Entity_Id := First_Entity (Formal_Pack);
3383 procedure Check_Mismatch (B : Boolean);
3384 -- Common error routine for mismatch between the parameters of
3385 -- the actual instance and those of the formal package.
3387 procedure Check_Mismatch (B : Boolean) is
3391 ("actual for & in actual instance does not match formal",
3392 Parent (Actual_Pack), E1);
3396 -- Start of processing for Check_Formal_Package_Instance
3400 and then Present (E2)
3402 exit when Ekind (E1) = E_Package
3403 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3405 if Is_Type (E1) then
3407 -- Subtypes must statically match. E1 and E2 are the
3408 -- local entities that are subtypes of the actuals.
3409 -- Itypes generated for other parameters need not be checked,
3410 -- the check will be performed on the parameters themselves.
3412 if not Is_Itype (E1)
3413 and then not Is_Itype (E2)
3417 or else Etype (E1) /= Etype (E2)
3418 or else not Subtypes_Statically_Match (E1, E2));
3421 elsif Ekind (E1) = E_Constant then
3423 -- IN parameters must denote the same static value, or
3424 -- the same constant, or the literal null.
3426 Expr1 := Expression (Parent (E1));
3428 if Ekind (E2) /= E_Constant then
3429 Check_Mismatch (True);
3432 Expr2 := Expression (Parent (E2));
3435 if Is_Static_Expression (Expr1) then
3437 if not Is_Static_Expression (Expr2) then
3438 Check_Mismatch (True);
3440 elsif Is_Integer_Type (Etype (E1)) then
3443 V1 : Uint := Expr_Value (Expr1);
3444 V2 : Uint := Expr_Value (Expr2);
3446 Check_Mismatch (V1 /= V2);
3449 elsif Is_Real_Type (Etype (E1)) then
3452 V1 : Ureal := Expr_Value_R (Expr1);
3453 V2 : Ureal := Expr_Value_R (Expr2);
3455 Check_Mismatch (V1 /= V2);
3458 elsif Is_String_Type (Etype (E1))
3459 and then Nkind (Expr1) = N_String_Literal
3462 if Nkind (Expr2) /= N_String_Literal then
3463 Check_Mismatch (True);
3466 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3470 elsif Is_Entity_Name (Expr1) then
3471 if Is_Entity_Name (Expr2) then
3472 if Entity (Expr1) = Entity (Expr2) then
3475 elsif Ekind (Entity (Expr2)) = E_Constant
3476 and then Is_Entity_Name (Constant_Value (Entity (Expr2)))
3478 Entity (Constant_Value (Entity (Expr2))) = Entity (Expr1)
3482 Check_Mismatch (True);
3485 Check_Mismatch (True);
3488 elsif Nkind (Expr1) = N_Null then
3489 Check_Mismatch (Nkind (Expr1) /= N_Null);
3492 Check_Mismatch (True);
3495 elsif Ekind (E1) = E_Variable
3496 or else Ekind (E1) = E_Package
3499 (Ekind (E1) /= Ekind (E2)
3500 or else Renamed_Object (E1) /= Renamed_Object (E2));
3502 elsif Is_Overloadable (E1) then
3504 -- Verify that the names of the entities match.
3505 -- What if actual is an attribute ???
3508 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3511 raise Program_Error;
3518 end Check_Formal_Package_Instance;
3520 ---------------------------
3521 -- Check_Formal_Packages --
3522 ---------------------------
3524 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3526 Formal_P : Entity_Id;
3529 -- Iterate through the declarations in the instance, looking for
3530 -- package renaming declarations that denote instances of formal
3531 -- packages. Stop when we find the renaming of the current package
3532 -- itself. The declaration for a formal package without a box is
3533 -- followed by an internal entity that repeats the instantiation.
3535 E := First_Entity (P_Id);
3536 while Present (E) loop
3537 if Ekind (E) = E_Package then
3538 if Renamed_Object (E) = P_Id then
3541 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3544 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3545 Formal_P := Next_Entity (E);
3546 Check_Formal_Package_Instance (Formal_P, E);
3552 end Check_Formal_Packages;
3554 ---------------------------------
3555 -- Check_Forward_Instantiation --
3556 ---------------------------------
3558 procedure Check_Forward_Instantiation (N : Node_Id; Decl : Node_Id) is
3560 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3563 -- The instantiation appears before the generic body if we are in the
3564 -- scope of the unit containing the generic, either in its spec or in
3565 -- the package body. and before the generic body.
3567 if Ekind (Gen_Comp) = E_Package_Body then
3568 Gen_Comp := Spec_Entity (Gen_Comp);
3571 if In_Open_Scopes (Gen_Comp)
3572 and then No (Corresponding_Body (Decl))
3577 and then not Is_Compilation_Unit (S)
3578 and then not Is_Child_Unit (S)
3580 if Ekind (S) = E_Package then
3581 Set_Has_Forward_Instantiation (S);
3587 end Check_Forward_Instantiation;
3589 ---------------------------
3590 -- Check_Generic_Actuals --
3591 ---------------------------
3593 -- The visibility of the actuals may be different between the
3594 -- point of generic instantiation and the instantiation of the body.
3596 procedure Check_Generic_Actuals
3597 (Instance : Entity_Id;
3598 Is_Formal_Box : Boolean)
3604 E := First_Entity (Instance);
3605 while Present (E) loop
3607 and then Nkind (Parent (E)) = N_Subtype_Declaration
3608 and then Scope (Etype (E)) /= Instance
3609 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3611 Check_Private_View (Subtype_Indication (Parent (E)));
3612 Set_Is_Generic_Actual_Type (E, True);
3613 Set_Is_Hidden (E, False);
3615 -- We constructed the generic actual type as a subtype of
3616 -- the supplied type. This means that it normally would not
3617 -- inherit subtype specific attributes of the actual, which
3618 -- is wrong for the generic case.
3620 Astype := Ancestor_Subtype (E);
3624 -- can happen when E is an itype that is the full view of
3625 -- a private type completed, e.g. with a constrained array.
3627 Astype := Base_Type (E);
3630 Set_Size_Info (E, (Astype));
3631 Set_RM_Size (E, RM_Size (Astype));
3632 Set_First_Rep_Item (E, First_Rep_Item (Astype));
3634 if Is_Discrete_Or_Fixed_Point_Type (E) then
3635 Set_RM_Size (E, RM_Size (Astype));
3637 -- In nested instances, the base type of an access actual
3638 -- may itself be private, and need to be exchanged.
3640 elsif Is_Access_Type (E)
3641 and then Is_Private_Type (Etype (E))
3644 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
3647 elsif Ekind (E) = E_Package then
3649 -- If this is the renaming for the current instance, we're done.
3650 -- Otherwise it is a formal package. If the corresponding formal
3651 -- was declared with a box, the (instantiations of the) generic
3652 -- formal part are also visible. Otherwise, ignore the entity
3653 -- created to validate the actuals.
3655 if Renamed_Object (E) = Instance then
3658 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3661 -- The visibility of a formal of an enclosing generic is already
3664 elsif Denotes_Formal_Package (E) then
3667 elsif Present (Associated_Formal_Package (E))
3668 and then Box_Present (Parent (Associated_Formal_Package (E)))
3670 Check_Generic_Actuals (Renamed_Object (E), True);
3671 Set_Is_Hidden (E, False);
3675 Set_Is_Hidden (E, not Is_Formal_Box);
3681 end Check_Generic_Actuals;
3683 ------------------------------
3684 -- Check_Generic_Child_Unit --
3685 ------------------------------
3687 procedure Check_Generic_Child_Unit
3689 Parent_Installed : in out Boolean)
3691 Loc : constant Source_Ptr := Sloc (Gen_Id);
3692 Gen_Par : Entity_Id := Empty;
3693 Inst_Par : Entity_Id;
3697 function Find_Generic_Child
3701 -- Search generic parent for possible child unit.
3703 function In_Enclosing_Instance return Boolean;
3704 -- Within an instance of the parent, the child unit may be denoted
3705 -- by a simple name. Examine enclosing scopes to locate a possible
3706 -- parent instantiation.
3708 function Find_Generic_Child
3716 -- If entity of name is already set, instance has already been
3717 -- resolved, e.g. in an enclosing instantiation.
3719 if Present (Entity (Id)) then
3720 if Scope (Entity (Id)) = Scop then
3727 E := First_Entity (Scop);
3728 while Present (E) loop
3729 if Chars (E) = Chars (Id)
3730 and then Is_Child_Unit (E)
3732 if Is_Child_Unit (E)
3733 and then not Is_Visible_Child_Unit (E)
3736 ("generic child unit& is not visible", Gen_Id, E);
3748 end Find_Generic_Child;
3750 function In_Enclosing_Instance return Boolean is
3751 Enclosing_Instance : Node_Id;
3754 Enclosing_Instance := Current_Scope;
3756 while Present (Enclosing_Instance) loop
3757 exit when Ekind (Enclosing_Instance) = E_Package
3758 and then Nkind (Parent (Enclosing_Instance)) =
3759 N_Package_Specification
3761 (Generic_Parent (Parent (Enclosing_Instance)));
3763 Enclosing_Instance := Scope (Enclosing_Instance);
3766 if Present (Enclosing_Instance) then
3767 E := Find_Generic_Child
3768 (Generic_Parent (Parent (Enclosing_Instance)), Gen_Id);
3775 Make_Expanded_Name (Loc,
3777 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
3778 Selector_Name => New_Occurrence_Of (E, Loc)));
3780 Set_Entity (Gen_Id, E);
3781 Set_Etype (Gen_Id, Etype (E));
3782 Parent_Installed := False; -- Already in scope.
3788 end In_Enclosing_Instance;
3790 -- Start of processing for Check_Generic_Child_Unit
3793 -- If the name of the generic is given by a selected component, it
3794 -- may be the name of a generic child unit, and the prefix is the name
3795 -- of an instance of the parent, in which case the child unit must be
3796 -- visible. If this instance is not in scope, it must be placed there
3797 -- and removed after instantiation, because what is being instantiated
3798 -- is not the original child, but the corresponding child present in
3799 -- the instance of the parent.
3801 -- If the child is instantiated within the parent, it can be given by
3802 -- a simple name. In this case the instance is already in scope, but
3803 -- the child generic must be recovered from the generic parent as well.
3805 if Nkind (Gen_Id) = N_Selected_Component then
3806 S := Selector_Name (Gen_Id);
3807 Analyze (Prefix (Gen_Id));
3808 Inst_Par := Entity (Prefix (Gen_Id));
3810 if Ekind (Inst_Par) = E_Package
3811 and then Present (Renamed_Object (Inst_Par))
3813 Inst_Par := Renamed_Object (Inst_Par);
3816 if Ekind (Inst_Par) = E_Package then
3817 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
3818 Gen_Par := Generic_Parent (Parent (Inst_Par));
3820 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
3822 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
3824 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
3827 elsif Ekind (Inst_Par) = E_Generic_Package
3828 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
3831 -- A formal package may be a real child package, and not the
3832 -- implicit instance within a parent. In this case the child is
3833 -- not visible and has to be retrieved explicitly as well.
3835 Gen_Par := Inst_Par;
3838 if Present (Gen_Par) then
3840 -- The prefix denotes an instantiation. The entity itself
3841 -- may be a nested generic, or a child unit.
3843 E := Find_Generic_Child (Gen_Par, S);
3846 Change_Selected_Component_To_Expanded_Name (Gen_Id);
3847 Set_Entity (Gen_Id, E);
3848 Set_Etype (Gen_Id, Etype (E));
3850 Set_Etype (S, Etype (E));
3852 -- Indicate that this is a reference to the parent.
3854 if In_Extended_Main_Source_Unit (Gen_Id) then
3855 Set_Is_Instantiated (Inst_Par);
3858 -- A common mistake is to replicate the naming scheme of
3859 -- a hierarchy by instantiating a generic child directly,
3860 -- rather than the implicit child in a parent instance:
3862 -- generic .. package Gpar is ..
3863 -- generic .. package Gpar.Child is ..
3864 -- package Par is new Gpar ();
3867 -- package Par.Child is new Gpar.Child ();
3868 -- rather than Par.Child
3870 -- In this case the instantiation is within Par, which is
3871 -- an instance, but Gpar does not denote Par because we are
3872 -- not IN the instance of Gpar, so this is illegal. The test
3873 -- below recognizes this particular case.
3875 if Is_Child_Unit (E)
3876 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
3877 and then (not In_Instance
3878 or else Nkind (Parent (Parent (Gen_Id))) =
3882 ("prefix of generic child unit must be instance of parent",
3886 if not In_Open_Scopes (Inst_Par)
3887 and then Nkind (Parent (Gen_Id))
3888 not in N_Generic_Renaming_Declaration
3890 Install_Parent (Inst_Par);
3891 Parent_Installed := True;
3895 -- If the generic parent does not contain an entity that
3896 -- corresponds to the selector, the instance doesn't either.
3897 -- Analyzing the node will yield the appropriate error message.
3898 -- If the entity is not a child unit, then it is an inner
3899 -- generic in the parent.
3907 if Is_Child_Unit (Entity (Gen_Id))
3908 and then Nkind (Parent (Gen_Id))
3909 not in N_Generic_Renaming_Declaration
3910 and then not In_Open_Scopes (Inst_Par)
3912 Install_Parent (Inst_Par);
3913 Parent_Installed := True;
3917 elsif Nkind (Gen_Id) = N_Expanded_Name then
3919 -- Entity already present, analyze prefix, whose meaning may be
3920 -- an instance in the current context. If it is an instance of
3921 -- a relative within another, the proper parent may still have
3922 -- to be installed, if they are not of the same generation.
3924 Analyze (Prefix (Gen_Id));
3925 Inst_Par := Entity (Prefix (Gen_Id));
3927 if In_Enclosing_Instance then
3930 elsif Present (Entity (Gen_Id))
3931 and then Is_Child_Unit (Entity (Gen_Id))
3932 and then not In_Open_Scopes (Inst_Par)
3934 Install_Parent (Inst_Par);
3935 Parent_Installed := True;
3938 elsif In_Enclosing_Instance then
3939 -- The child unit is found in some enclosing scope.
3945 -- If this is the renaming of the implicit child in a parent
3946 -- instance, recover the parent name and install it.
3948 if Is_Entity_Name (Gen_Id) then
3949 E := Entity (Gen_Id);
3951 if Is_Generic_Unit (E)
3952 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
3953 and then Is_Child_Unit (Renamed_Object (E))
3954 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
3955 and then Nkind (Name (Parent (E))) = N_Expanded_Name
3958 New_Copy_Tree (Name (Parent (E))));
3959 Inst_Par := Entity (Prefix (Gen_Id));
3961 if not In_Open_Scopes (Inst_Par) then
3962 Install_Parent (Inst_Par);
3963 Parent_Installed := True;
3966 -- If it is a child unit of a non-generic parent, it may be
3967 -- use-visible and given by a direct name. Install parent as
3970 elsif Is_Generic_Unit (E)
3971 and then Is_Child_Unit (E)
3973 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
3974 and then not Is_Generic_Unit (Scope (E))
3976 if not In_Open_Scopes (Scope (E)) then
3977 Install_Parent (Scope (E));
3978 Parent_Installed := True;
3983 end Check_Generic_Child_Unit;
3985 -----------------------------
3986 -- Check_Hidden_Child_Unit --
3987 -----------------------------
3989 procedure Check_Hidden_Child_Unit
3991 Gen_Unit : Entity_Id;
3992 Act_Decl_Id : Entity_Id)
3994 Gen_Id : Node_Id := Name (N);
3997 if Is_Child_Unit (Gen_Unit)
3998 and then Is_Child_Unit (Act_Decl_Id)
3999 and then Nkind (Gen_Id) = N_Expanded_Name
4000 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4001 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4003 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4005 ("generic unit & is implicitly declared in &",
4006 Defining_Unit_Name (N), Gen_Unit);
4007 Error_Msg_N ("\instance must have different name",
4008 Defining_Unit_Name (N));
4010 end Check_Hidden_Child_Unit;
4012 ------------------------
4013 -- Check_Private_View --
4014 ------------------------
4016 procedure Check_Private_View (N : Node_Id) is
4017 T : constant Entity_Id := Etype (N);
4021 -- Exchange views if the type was not private in the generic but is
4022 -- private at the point of instantiation. Do not exchange views if
4023 -- the scope of the type is in scope. This can happen if both generic
4024 -- and instance are sibling units, or if type is defined in a parent.
4025 -- In this case the visibility of the type will be correct for all
4029 BT := Base_Type (T);
4031 if Is_Private_Type (T)
4032 and then not Has_Private_View (N)
4033 and then Present (Full_View (T))
4034 and then not In_Open_Scopes (Scope (T))
4036 -- In the generic, the full type was visible. Save the
4037 -- private entity, for subsequent exchange.
4041 elsif Has_Private_View (N)
4042 and then not Is_Private_Type (T)
4043 and then not Has_Been_Exchanged (T)
4044 and then Etype (Associated_Node (N)) /= T
4046 -- Only the private declaration was visible in the generic. If
4047 -- the type appears in a subtype declaration, the subtype in the
4048 -- instance must have a view compatible with that of its parent,
4049 -- which must be exchanged (see corresponding code in Restore_
4050 -- Private_Views). Otherwise, if the type is defined in a parent
4051 -- unit, leave full visibility within instance, which is safe.
4053 if In_Open_Scopes (Scope (Base_Type (T)))
4054 and then not Is_Private_Type (Base_Type (T))
4055 and then Comes_From_Source (Base_Type (T))
4059 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4060 or else not In_Private_Part (Scope (Base_Type (T)))
4062 Append_Elmt (T, Exchanged_Views);
4063 Exchange_Declarations (Etype (Associated_Node (N)));
4066 -- For composite types with inconsistent representation
4067 -- exchange component types accordingly.
4069 elsif Is_Access_Type (T)
4070 and then Is_Private_Type (Designated_Type (T))
4071 and then Present (Full_View (Designated_Type (T)))
4073 Switch_View (Designated_Type (T));
4075 elsif Is_Array_Type (T)
4076 and then Is_Private_Type (Component_Type (T))
4077 and then not Has_Private_View (N)
4078 and then Present (Full_View (Component_Type (T)))
4080 Switch_View (Component_Type (T));
4082 elsif Is_Private_Type (T)
4083 and then Present (Full_View (T))
4084 and then Is_Array_Type (Full_View (T))
4085 and then Is_Private_Type (Component_Type (Full_View (T)))
4089 -- Finally, a non-private subtype may have a private base type,
4090 -- which must be exchanged for consistency. This can happen when
4091 -- instantiating a package body, when the scope stack is empty but
4092 -- in fact the subtype and the base type are declared in an enclosing
4095 elsif not Is_Private_Type (T)
4096 and then not Has_Private_View (N)
4097 and then Is_Private_Type (Base_Type (T))
4098 and then Present (Full_View (BT))
4099 and then not Is_Generic_Type (BT)
4100 and then not In_Open_Scopes (BT)
4102 Append_Elmt (Full_View (BT), Exchanged_Views);
4103 Exchange_Declarations (BT);
4106 end Check_Private_View;
4108 --------------------------
4109 -- Contains_Instance_Of --
4110 --------------------------
4112 function Contains_Instance_Of
4124 -- Verify that there are no circular instantiations. We check whether
4125 -- the unit contains an instance of the current scope or some enclosing
4126 -- scope (in case one of the instances appears in a subunit). Longer
4127 -- circularities involving subunits might seem too pathological to
4128 -- consider, but they were not too pathological for the authors of
4129 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4130 -- enclosing generic scopes as containing an instance.
4133 -- Within a generic subprogram body, the scope is not generic, to
4134 -- allow for recursive subprograms. Use the declaration to determine
4135 -- whether this is a generic unit.
4137 if Ekind (Scop) = E_Generic_Package
4138 or else (Is_Subprogram (Scop)
4139 and then Nkind (Unit_Declaration_Node (Scop)) =
4140 N_Generic_Subprogram_Declaration)
4142 Elmt := First_Elmt (Inner_Instances (Inner));
4144 while Present (Elmt) loop
4145 if Node (Elmt) = Scop then
4146 Error_Msg_Node_2 := Inner;
4148 ("circular Instantiation: & instantiated within &!",
4152 elsif Node (Elmt) = Inner then
4155 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4156 Error_Msg_Node_2 := Inner;
4158 ("circular Instantiation: & instantiated within &!",
4166 -- Indicate that Inner is being instantiated within Scop.
4168 Append_Elmt (Inner, Inner_Instances (Scop));
4171 if Scop = Standard_Standard then
4174 Scop := Scope (Scop);
4179 end Contains_Instance_Of;
4181 -----------------------
4182 -- Copy_Generic_Node --
4183 -----------------------
4185 function Copy_Generic_Node
4187 Parent_Id : Node_Id;
4188 Instantiating : Boolean)
4194 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4195 -- Check the given value of one of the Fields referenced by the
4196 -- current node to determine whether to copy it recursively. The
4197 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4198 -- value (Sloc, Uint, Char) in which case it need not be copied.
4200 procedure Copy_Descendants;
4201 -- Common utility for various nodes.
4203 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4204 -- Make copy of element list.
4206 function Copy_Generic_List
4208 Parent_Id : Node_Id)
4210 -- Apply Copy_Node recursively to the members of a node list.
4212 -----------------------
4213 -- Copy_Descendants --
4214 -----------------------
4216 procedure Copy_Descendants is
4218 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4219 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4220 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4221 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4222 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4223 end Copy_Descendants;
4225 -----------------------------
4226 -- Copy_Generic_Descendant --
4227 -----------------------------
4229 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4231 if D = Union_Id (Empty) then
4234 elsif D in Node_Range then
4236 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4238 elsif D in List_Range then
4239 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4241 elsif D in Elist_Range then
4242 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4244 -- Nothing else is copyable (e.g. Uint values), return as is
4249 end Copy_Generic_Descendant;
4251 ------------------------
4252 -- Copy_Generic_Elist --
4253 ------------------------
4255 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4262 M := First_Elmt (E);
4263 while Present (M) loop
4265 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4274 end Copy_Generic_Elist;
4276 -----------------------
4277 -- Copy_Generic_List --
4278 -----------------------
4280 function Copy_Generic_List
4282 Parent_Id : Node_Id)
4291 Set_Parent (New_L, Parent_Id);
4294 while Present (N) loop
4295 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4304 end Copy_Generic_List;
4306 -- Start of processing for Copy_Generic_Node
4313 New_N := New_Copy (N);
4315 if Instantiating then
4316 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4319 if not Is_List_Member (N) then
4320 Set_Parent (New_N, Parent_Id);
4323 -- If defining identifier, then all fields have been copied already
4325 if Nkind (New_N) in N_Entity then
4328 -- Special casing for identifiers and other entity names and operators
4330 elsif (Nkind (New_N) = N_Identifier
4331 or else Nkind (New_N) = N_Character_Literal
4332 or else Nkind (New_N) = N_Expanded_Name
4333 or else Nkind (New_N) = N_Operator_Symbol
4334 or else Nkind (New_N) in N_Op)
4336 if not Instantiating then
4338 -- Link both nodes in order to assign subsequently the
4339 -- entity of the copy to the original node, in case this
4340 -- is a global reference.
4342 Set_Associated_Node (N, New_N);
4344 -- If we are within an instantiation, this is a nested generic
4345 -- that has already been analyzed at the point of definition. We
4346 -- must preserve references that were global to the enclosing
4347 -- parent at that point. Other occurrences, whether global or
4348 -- local to the current generic, must be resolved anew, so we
4349 -- reset the entity in the generic copy. A global reference has
4350 -- a smaller depth than the parent, or else the same depth in
4351 -- case both are distinct compilation units.
4353 -- It is also possible for Current_Instantiated_Parent to be
4354 -- defined, and for this not to be a nested generic, namely
4355 -- if the unit is loaded through Rtsfind. In that case, the
4356 -- entity of New_N is only a link to the associated node, and
4357 -- not a defining occurrence.
4359 -- The entities for parent units in the defining_program_unit
4360 -- of a generic child unit are established when the context of
4361 -- the unit is first analyzed, before the generic copy is made.
4362 -- They are preserved in the copy for use in ASIS queries.
4364 Ent := Entity (New_N);
4366 if No (Current_Instantiated_Parent.Gen_Id) then
4368 or else Nkind (Ent) /= N_Defining_Identifier
4369 or else Nkind (Parent (N)) /= N_Defining_Program_Unit_Name
4371 Set_Associated_Node (New_N, Empty);
4376 not (Nkind (Ent) = N_Defining_Identifier
4378 Nkind (Ent) = N_Defining_Character_Literal
4380 Nkind (Ent) = N_Defining_Operator_Symbol)
4381 or else No (Scope (Ent))
4382 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4383 or else (Scope_Depth (Scope (Ent)) >
4384 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4386 Get_Source_Unit (Ent) =
4387 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4389 Set_Associated_Node (New_N, Empty);
4392 -- Case of instantiating identifier or some other name or operator
4395 -- If the associated node is still defined, the entity in
4396 -- it is global, and must be copied to the instance.
4398 if Present (Associated_Node (N)) then
4399 if Nkind (Associated_Node (N)) = Nkind (N) then
4400 Set_Entity (New_N, Entity (Associated_Node (N)));
4401 Check_Private_View (N);
4403 elsif Nkind (Associated_Node (N)) = N_Function_Call then
4404 Set_Entity (New_N, Entity (Name (Associated_Node (N))));
4407 Set_Entity (New_N, Empty);
4412 -- For expanded name, we must copy the Prefix and Selector_Name
4414 if Nkind (N) = N_Expanded_Name then
4417 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4419 Set_Selector_Name (New_N,
4420 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4422 -- For operators, we must copy the right operand
4424 elsif Nkind (N) in N_Op then
4426 Set_Right_Opnd (New_N,
4427 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4429 -- And for binary operators, the left operand as well
4431 if Nkind (N) in N_Binary_Op then
4432 Set_Left_Opnd (New_N,
4433 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4437 -- Special casing for stubs
4439 elsif Nkind (N) in N_Body_Stub then
4441 -- In any case, we must copy the specification or defining
4442 -- identifier as appropriate.
4444 if Nkind (N) = N_Subprogram_Body_Stub then
4445 Set_Specification (New_N,
4446 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4449 Set_Defining_Identifier (New_N,
4451 (Defining_Identifier (N), New_N, Instantiating));
4454 -- If we are not instantiating, then this is where we load and
4455 -- analyze subunits, i.e. at the point where the stub occurs. A
4456 -- more permissivle system might defer this analysis to the point
4457 -- of instantiation, but this seems to complicated for now.
4459 if not Instantiating then
4461 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4463 Unum : Unit_Number_Type;
4469 (Load_Name => Subunit_Name,
4474 -- If the proper body is not found, a warning message will
4475 -- be emitted when analyzing the stub, or later at the the
4476 -- point of instantiation. Here we just leave the stub as is.
4478 if Unum = No_Unit then
4479 Subunits_Missing := True;
4480 goto Subunit_Not_Found;
4483 Subunit := Cunit (Unum);
4485 -- We must create a generic copy of the subunit, in order
4486 -- to perform semantic analysis on it, and we must replace
4487 -- the stub in the original generic unit with the subunit,
4488 -- in order to preserve non-local references within.
4490 -- Only the proper body needs to be copied. Library_Unit and
4491 -- context clause are simply inherited by the generic copy.
4492 -- Note that the copy (which may be recursive if there are
4493 -- nested subunits) must be done first, before attaching it
4494 -- to the enclosing generic.
4498 (Proper_Body (Unit (Subunit)),
4499 Empty, Instantiating => False);
4501 -- Now place the original proper body in the original
4504 Rewrite (N, Proper_Body (Unit (Subunit)));
4505 Set_Was_Originally_Stub (N);
4507 -- Finally replace the body of the subunit with its copy,
4508 -- and make this new subunit into the library unit of the
4509 -- generic copy, which does not have stubs any longer.
4511 Set_Proper_Body (Unit (Subunit), New_Body);
4512 Set_Library_Unit (New_N, Subunit);
4513 Inherit_Context (Unit (Subunit), N);
4517 -- If we are instantiating, this must be an error case, since
4518 -- otherwise we would have replaced the stub node by the proper
4519 -- body that corresponds. So just ignore it in the copy (i.e.
4520 -- we have copied it, and that is good enough).
4526 <<Subunit_Not_Found>> null;
4528 -- If the node is a compilation unit, it is the subunit of a stub,
4529 -- which has been loaded already (see code below). In this case,
4530 -- the library unit field of N points to the parent unit (which
4531 -- is a compilation unit) and need not (and cannot!) be copied.
4533 -- When the proper body of the stub is analyzed, thie library_unit
4534 -- link is used to establish the proper context (see sem_ch10).
4536 -- The other fields of a compilation unit are copied as usual
4538 elsif Nkind (N) = N_Compilation_Unit then
4540 -- This code can only be executed when not instantiating, because
4541 -- in the copy made for an instantiation, the compilation unit
4542 -- node has disappeared at the point that a stub is replaced by
4545 pragma Assert (not Instantiating);
4547 Set_Context_Items (New_N,
4548 Copy_Generic_List (Context_Items (N), New_N));
4551 Copy_Generic_Node (Unit (N), New_N, False));
4553 Set_First_Inlined_Subprogram (New_N,
4555 (First_Inlined_Subprogram (N), New_N, False));
4557 Set_Aux_Decls_Node (New_N,
4558 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4560 -- For an assignment node, the assignment is known to be semantically
4561 -- legal if we are instantiating the template. This avoids incorrect
4562 -- diagnostics in generated code.
4564 elsif Nkind (N) = N_Assignment_Statement then
4566 -- Copy name and expression fields in usual manner
4569 Copy_Generic_Node (Name (N), New_N, Instantiating));
4571 Set_Expression (New_N,
4572 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4574 if Instantiating then
4575 Set_Assignment_OK (Name (New_N), True);
4578 elsif Nkind (N) = N_Aggregate
4579 or else Nkind (N) = N_Extension_Aggregate
4582 if not Instantiating then
4583 Set_Associated_Node (N, New_N);
4586 if Present (Associated_Node (N))
4587 and then Nkind (Associated_Node (N)) = Nkind (N)
4589 -- In the generic the aggregate has some composite type.
4590 -- If at the point of instantiation the type has a private
4591 -- view, install the full view (and that of its ancestors,
4595 T : Entity_Id := (Etype (Associated_Node (New_N)));
4600 and then Is_Private_Type (T)
4606 and then Is_Tagged_Type (T)
4607 and then Is_Derived_Type (T)
4609 Rt := Root_Type (T);
4614 if Is_Private_Type (T) then
4625 -- Do not copy the associated node, which points to
4626 -- the generic copy of the aggregate.
4628 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4629 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4630 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4631 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4633 -- Allocators do not have an identifier denoting the access type,
4634 -- so we must locate it through the expression to check whether
4635 -- the views are consistent.
4637 elsif Nkind (N) = N_Allocator
4638 and then Nkind (Expression (N)) = N_Qualified_Expression
4639 and then Instantiating
4642 T : Node_Id := Associated_Node (Subtype_Mark (Expression (N)));
4647 -- Retrieve the allocator node in the generic copy.
4649 Acc_T := Etype (Parent (Parent (T)));
4651 and then Is_Private_Type (Acc_T)
4653 Switch_View (Acc_T);
4660 -- For a proper body, we must catch the case of a proper body that
4661 -- replaces a stub. This represents the point at which a separate
4662 -- compilation unit, and hence template file, may be referenced, so
4663 -- we must make a new source instantiation entry for the template
4664 -- of the subunit, and ensure that all nodes in the subunit are
4665 -- adjusted using this new source instantiation entry.
4667 elsif Nkind (N) in N_Proper_Body then
4670 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4673 if Instantiating and then Was_Originally_Stub (N) then
4674 Create_Instantiation_Source
4675 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4678 -- Now copy the fields of the proper body, using the new
4679 -- adjustment factor if one was needed as per test above.
4683 -- Restore the original adjustment factor in case changed
4685 S_Adjustment := Save_Adjustment;
4688 -- Don't copy Ident or Comment pragmas, since the comment belongs
4689 -- to the generic unit, not to the instantiating unit.
4691 elsif Nkind (N) = N_Pragma
4692 and then Instantiating
4695 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4698 if Prag_Id = Pragma_Ident
4699 or else Prag_Id = Pragma_Comment
4701 New_N := Make_Null_Statement (Sloc (N));
4708 -- For the remaining nodes, copy recursively their descendants.
4714 and then Nkind (N) = N_Subprogram_Body
4716 Set_Generic_Parent (Specification (New_N), N);
4721 end Copy_Generic_Node;
4723 ----------------------------
4724 -- Denotes_Formal_Package --
4725 ----------------------------
4727 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4728 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4729 Scop : Entity_Id := Scope (Pack);
4733 if Ekind (Scop) = E_Generic_Package
4734 or else Nkind (Unit_Declaration_Node (Scop))
4735 = N_Generic_Subprogram_Declaration
4739 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4746 -- Check whether this package is associated with a formal
4747 -- package of the enclosing instantiation. Iterate over the
4748 -- list of renamings.
4750 E := First_Entity (Par);
4751 while Present (E) loop
4753 if Ekind (E) /= E_Package
4754 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4757 elsif Renamed_Object (E) = Par then
4760 elsif Renamed_Object (E) = Pack then
4769 end Denotes_Formal_Package;
4775 procedure End_Generic is
4777 -- ??? More things could be factored out in this
4778 -- routine. Should probably be done at a later stage.
4780 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4781 Generic_Flags.Decrement_Last;
4783 Expander_Mode_Restore;
4786 ----------------------
4787 -- Find_Actual_Type --
4788 ----------------------
4790 function Find_Actual_Type
4792 Gen_Scope : Entity_Id)
4798 if not Is_Child_Unit (Gen_Scope) then
4799 return Get_Instance_Of (Typ);
4801 elsif not Is_Generic_Type (Typ)
4802 or else Scope (Typ) = Gen_Scope
4804 return Get_Instance_Of (Typ);
4807 T := Current_Entity (Typ);
4808 while Present (T) loop
4809 if In_Open_Scopes (Scope (T)) then
4818 end Find_Actual_Type;
4820 ----------------------------
4821 -- Freeze_Subprogram_Body --
4822 ----------------------------
4824 procedure Freeze_Subprogram_Body
4825 (Inst_Node : Node_Id;
4827 Pack_Id : Entity_Id)
4830 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
4831 Par : constant Entity_Id := Scope (Gen_Unit);
4836 function Earlier (N1, N2 : Node_Id) return Boolean;
4837 -- Yields True if N1 and N2 appear in the same compilation unit,
4838 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4839 -- traversal of the tree for the unit.
4841 function Enclosing_Body (N : Node_Id) return Node_Id;
4842 -- Find innermost package body that encloses the given node, and which
4843 -- is not a compilation unit. Freeze nodes for the instance, or for its
4844 -- enclosing body, may be inserted after the enclosing_body of the
4847 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4848 -- Find entity for given package body, and locate or create a freeze
4851 function True_Parent (N : Node_Id) return Node_Id;
4852 -- For a subunit, return parent of corresponding stub.
4858 function Earlier (N1, N2 : Node_Id) return Boolean is
4864 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4865 -- Find distance from given node to enclosing compilation unit.
4867 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4870 and then Nkind (P) /= N_Compilation_Unit
4872 P := True_Parent (P);
4878 Find_Depth (P1, D1);
4879 Find_Depth (P2, D2);
4889 P1 := True_Parent (P1);
4894 P2 := True_Parent (P2);
4898 -- At this point P1 and P2 are at the same distance from the root.
4899 -- We examine their parents until we find a common declarative
4900 -- list, at which point we can establish their relative placement
4901 -- by comparing their ultimate slocs. If we reach the root,
4902 -- N1 and N2 do not descend from the same declarative list (e.g.
4903 -- one is nested in the declarative part and the other is in a block
4904 -- in the statement part) and the earlier one is already frozen.
4906 while not Is_List_Member (P1)
4907 or else not Is_List_Member (P2)
4908 or else List_Containing (P1) /= List_Containing (P2)
4910 P1 := True_Parent (P1);
4911 P2 := True_Parent (P2);
4913 if Nkind (Parent (P1)) = N_Subunit then
4914 P1 := Corresponding_Stub (Parent (P1));
4917 if Nkind (Parent (P2)) = N_Subunit then
4918 P2 := Corresponding_Stub (Parent (P2));
4927 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4930 --------------------
4931 -- Enclosing_Body --
4932 --------------------
4934 function Enclosing_Body (N : Node_Id) return Node_Id is
4935 P : Node_Id := Parent (N);
4939 and then Nkind (Parent (P)) /= N_Compilation_Unit
4941 if Nkind (P) = N_Package_Body then
4943 if Nkind (Parent (P)) = N_Subunit then
4944 return Corresponding_Stub (Parent (P));
4950 P := True_Parent (P);
4956 -------------------------
4957 -- Package_Freeze_Node --
4958 -------------------------
4960 function Package_Freeze_Node (B : Node_Id) return Node_Id is
4964 if Nkind (B) = N_Package_Body then
4965 Id := Corresponding_Spec (B);
4967 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
4968 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
4971 Ensure_Freeze_Node (Id);
4972 return Freeze_Node (Id);
4973 end Package_Freeze_Node;
4979 function True_Parent (N : Node_Id) return Node_Id is
4981 if Nkind (Parent (N)) = N_Subunit then
4982 return Parent (Corresponding_Stub (Parent (N)));
4988 -- Start of processing of Freeze_Subprogram_Body
4991 -- If the instance and the generic body appear within the same
4992 -- unit, and the instance preceeds the generic, the freeze node for
4993 -- the instance must appear after that of the generic. If the generic
4994 -- is nested within another instance I2, then current instance must
4995 -- be frozen after I2. In both cases, the freeze nodes are those of
4996 -- enclosing packages. Otherwise, the freeze node is placed at the end
4997 -- of the current declarative part.
4999 Enc_G := Enclosing_Body (Gen_Body);
5000 Enc_I := Enclosing_Body (Inst_Node);
5001 Ensure_Freeze_Node (Pack_Id);
5002 F_Node := Freeze_Node (Pack_Id);
5004 if Is_Generic_Instance (Par)
5005 and then Present (Freeze_Node (Par))
5007 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5009 Insert_After (Freeze_Node (Par), F_Node);
5011 -- The body enclosing the instance should be frozen after the body
5012 -- that includes the generic, because the body of the instance may
5013 -- make references to entities therein. If the two are not in the
5014 -- same declarative part, or if the one enclosing the instance is
5015 -- frozen already, freeze the instance at the end of the current
5016 -- declarative part.
5018 elsif Is_Generic_Instance (Par)
5019 and then Present (Freeze_Node (Par))
5020 and then Present (Enc_I)
5022 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5024 (Nkind (Enc_I) = N_Package_Body
5026 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5029 -- The enclosing package may contain several instances. Rather
5030 -- than computing the earliest point at which to insert its
5031 -- freeze node, we place it at the end of the declarative part
5032 -- of the parent of the generic.
5034 Insert_After_Last_Decl
5035 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5038 Insert_After_Last_Decl (Inst_Node, F_Node);
5040 elsif Present (Enc_G)
5041 and then Present (Enc_I)
5042 and then Enc_G /= Enc_I
5043 and then Earlier (Inst_Node, Gen_Body)
5045 if Nkind (Enc_G) = N_Package_Body then
5046 E_G_Id := Corresponding_Spec (Enc_G);
5047 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5049 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5052 -- Freeze package that encloses instance, and place node after
5053 -- package that encloses generic. If enclosing package is already
5054 -- frozen we have to assume it is at the proper place. This may
5055 -- be a potential ABE that requires dynamic checking.
5057 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5059 -- Freeze enclosing subunit before instance
5061 Ensure_Freeze_Node (E_G_Id);
5063 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5064 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5067 Insert_After_Last_Decl (Inst_Node, F_Node);
5071 -- If none of the above, insert freeze node at the end of the
5072 -- current declarative part.
5074 Insert_After_Last_Decl (Inst_Node, F_Node);
5076 end Freeze_Subprogram_Body;
5082 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5084 return Generic_Renamings.Table (E).Gen_Id;
5087 ---------------------
5088 -- Get_Instance_Of --
5089 ---------------------
5091 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5092 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5094 if Res /= Assoc_Null then
5095 return Generic_Renamings.Table (Res).Act_Id;
5097 -- On exit, entity is not instantiated: not a generic parameter,
5098 -- or else parameter of an inner generic unit.
5102 end Get_Instance_Of;
5104 ------------------------------------
5105 -- Get_Package_Instantiation_Node --
5106 ------------------------------------
5108 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5109 Decl : Node_Id := Unit_Declaration_Node (A);
5113 -- If the instantiation is a compilation unit that does not need a
5114 -- body then the instantiation node has been rewritten as a package
5115 -- declaration for the instance, and we return the original node.
5116 -- If it is a compilation unit and the instance node has not been
5117 -- rewritten, then it is still the unit of the compilation.
5118 -- Otherwise the instantiation node appears after the declaration.
5119 -- If the entity is a formal package, the declaration may have been
5120 -- rewritten as a generic declaration (in the case of a formal with a
5121 -- box) or left as a formal package declaration if it has actuals, and
5122 -- is found with a forward search.
5124 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5125 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5126 return Original_Node (Decl);
5128 return Unit (Parent (Decl));
5131 elsif Nkind (Decl) = N_Generic_Package_Declaration
5132 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5134 return Original_Node (Decl);
5137 Inst := Next (Decl);
5138 while Nkind (Inst) /= N_Package_Instantiation
5139 and then Nkind (Inst) /= N_Formal_Package_Declaration
5146 end Get_Package_Instantiation_Node;
5148 ------------------------
5149 -- Has_Been_Exchanged --
5150 ------------------------
5152 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5153 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5156 while Present (Next) loop
5157 if Full_View (Node (Next)) = E then
5165 end Has_Been_Exchanged;
5171 function Hash (F : Entity_Id) return HTable_Range is
5173 return HTable_Range (F mod HTable_Size);
5176 ------------------------
5177 -- Hide_Current_Scope --
5178 ------------------------
5180 procedure Hide_Current_Scope is
5181 C : constant Entity_Id := Current_Scope;
5185 Set_Is_Hidden_Open_Scope (C);
5186 E := First_Entity (C);
5188 while Present (E) loop
5189 if Is_Immediately_Visible (E) then
5190 Set_Is_Immediately_Visible (E, False);
5191 Append_Elmt (E, Hidden_Entities);
5197 -- Make the scope name invisible as well. This is necessary, but
5198 -- might conflict with calls to Rtsfind later on, in case the scope
5199 -- is a predefined one. There is no clean solution to this problem, so
5200 -- for now we depend on the user not redefining Standard itself in one
5201 -- of the parent units.
5203 if Is_Immediately_Visible (C)
5204 and then C /= Standard_Standard
5206 Set_Is_Immediately_Visible (C, False);
5207 Append_Elmt (C, Hidden_Entities);
5210 end Hide_Current_Scope;
5212 ------------------------------
5213 -- In_Same_Declarative_Part --
5214 ------------------------------
5216 function In_Same_Declarative_Part
5221 Decls : Node_Id := Parent (F_Node);
5222 Nod : Node_Id := Parent (Inst);
5225 while Present (Nod) loop
5229 elsif Nkind (Nod) = N_Subprogram_Body
5230 or else Nkind (Nod) = N_Package_Body
5231 or else Nkind (Nod) = N_Task_Body
5232 or else Nkind (Nod) = N_Protected_Body
5233 or else Nkind (Nod) = N_Block_Statement
5237 elsif Nkind (Nod) = N_Subunit then
5238 Nod := Corresponding_Stub (Nod);
5240 elsif Nkind (Nod) = N_Compilation_Unit then
5243 Nod := Parent (Nod);
5248 end In_Same_Declarative_Part;
5250 ---------------------
5251 -- Inherit_Context --
5252 ---------------------
5254 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5255 Current_Context : List_Id;
5256 Current_Unit : Node_Id;
5261 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5263 -- The inherited context is attached to the enclosing compilation
5264 -- unit. This is either the main unit, or the declaration for the
5265 -- main unit (in case the instantation appears within the package
5266 -- declaration and the main unit is its body).
5268 Current_Unit := Parent (Inst);
5269 while Present (Current_Unit)
5270 and then Nkind (Current_Unit) /= N_Compilation_Unit
5272 Current_Unit := Parent (Current_Unit);
5275 Current_Context := Context_Items (Current_Unit);
5277 Item := First (Context_Items (Parent (Gen_Decl)));
5278 while Present (Item) loop
5279 if Nkind (Item) = N_With_Clause then
5280 New_I := New_Copy (Item);
5281 Set_Implicit_With (New_I, True);
5282 Append (New_I, Current_Context);
5288 end Inherit_Context;
5290 ----------------------------
5291 -- Insert_After_Last_Decl --
5292 ----------------------------
5294 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5295 L : List_Id := List_Containing (N);
5296 P : Node_Id := Parent (L);
5299 if not Is_List_Member (F_Node) then
5300 if Nkind (P) = N_Package_Specification
5301 and then L = Visible_Declarations (P)
5302 and then Present (Private_Declarations (P))
5303 and then not Is_Empty_List (Private_Declarations (P))
5305 L := Private_Declarations (P);
5308 Insert_After (Last (L), F_Node);
5310 end Insert_After_Last_Decl;
5316 procedure Install_Body
5317 (Act_Body : Node_Id;
5322 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5323 Act_Unit : constant Node_Id :=
5324 Unit (Cunit (Get_Source_Unit (N)));
5326 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5327 Gen_Unit : constant Node_Id :=
5328 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5329 Orig_Body : Node_Id := Gen_Body;
5330 Par : constant Entity_Id := Scope (Gen_Id);
5331 Body_Unit : Node_Id;
5333 Must_Delay : Boolean;
5335 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5336 -- Find subprogram (if any) that encloses instance and/or generic body.
5338 function True_Sloc (N : Node_Id) return Source_Ptr;
5339 -- If the instance is nested inside a generic unit, the Sloc of the
5340 -- instance indicates the place of the original definition, not the
5341 -- point of the current enclosing instance. Pending a better usage of
5342 -- Slocs to indicate instantiation places, we determine the place of
5343 -- origin of a node by finding the maximum sloc of any ancestor node.
5344 -- Why is this not equivalent fo Top_Level_Location ???
5346 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5347 Scop : Entity_Id := Scope (Id);
5350 while Scop /= Standard_Standard
5351 and then not Is_Overloadable (Scop)
5353 Scop := Scope (Scop);
5359 function True_Sloc (N : Node_Id) return Source_Ptr is
5366 while Present (N1) and then N1 /= Act_Unit loop
5367 if Sloc (N1) > Res then
5377 -- Start of processing for Install_Body
5380 -- If the body is a subunit, the freeze point is the corresponding
5381 -- stub in the current compilation, not the subunit itself.
5383 if Nkind (Parent (Gen_Body)) = N_Subunit then
5384 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5386 Orig_Body := Gen_Body;
5389 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5391 -- If the instantiation and the generic definition appear in the
5392 -- same package declaration, this is an early instantiation.
5393 -- If they appear in the same declarative part, it is an early
5394 -- instantiation only if the generic body appears textually later,
5395 -- and the generic body is also in the main unit.
5397 -- If instance is nested within a subprogram, and the generic body is
5398 -- not, the instance is delayed because the enclosing body is. If
5399 -- instance and body are within the same scope, or the same sub-
5400 -- program body, indicate explicitly that the instance is delayed.
5403 (Gen_Unit = Act_Unit
5404 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5405 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5406 or else (Gen_Unit = Body_Unit
5407 and then True_Sloc (N) < Sloc (Orig_Body)))
5408 and then Is_In_Main_Unit (Gen_Unit)
5409 and then (Scope (Act_Id) = Scope (Gen_Id)
5411 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5413 -- If this is an early instantiation, the freeze node is placed after
5414 -- the generic body. Otherwise, if the generic appears in an instance,
5415 -- we cannot freeze the current instance until the outer one is frozen.
5416 -- This is only relevant if the current instance is nested within some
5417 -- inner scope not itself within the outer instance. If this scope is
5418 -- a package body in the same declarative part as the outer instance,
5419 -- then that body needs to be frozen after the outer instance. Finally,
5420 -- if no delay is needed, we place the freeze node at the end of the
5421 -- current declarative part.
5423 if Expander_Active then
5424 Ensure_Freeze_Node (Act_Id);
5425 F_Node := Freeze_Node (Act_Id);
5428 Insert_After (Orig_Body, F_Node);
5430 elsif Is_Generic_Instance (Par)
5431 and then Present (Freeze_Node (Par))
5432 and then Scope (Act_Id) /= Par
5434 -- Freeze instance of inner generic after instance of enclosing
5437 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5438 Insert_After (Freeze_Node (Par), F_Node);
5440 -- Freeze package enclosing instance of inner generic after
5441 -- instance of enclosing generic.
5443 elsif Nkind (Parent (N)) = N_Package_Body
5444 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5448 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5451 Insert_After_Last_Decl (N, F_Node);
5452 Ensure_Freeze_Node (Enclosing);
5454 if not Is_List_Member (Freeze_Node (Enclosing)) then
5455 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5460 Insert_After_Last_Decl (N, F_Node);
5464 Insert_After_Last_Decl (N, F_Node);
5468 Set_Is_Frozen (Act_Id);
5469 Insert_Before (N, Act_Body);
5470 Mark_Rewrite_Insertion (Act_Body);
5473 --------------------
5474 -- Install_Parent --
5475 --------------------
5477 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5478 S : Entity_Id := Current_Scope;
5479 Inst_Par : Entity_Id;
5480 First_Par : Entity_Id;
5481 Inst_Node : Node_Id;
5482 Gen_Par : Entity_Id;
5483 First_Gen : Entity_Id;
5484 Ancestors : Elist_Id := New_Elmt_List;
5487 procedure Install_Formal_Packages (Par : Entity_Id);
5488 -- If any of the formals of the parent are formal packages with box,
5489 -- their formal parts are visible in the parent and thus in the child
5490 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5491 -- for the unit itself.
5493 procedure Install_Noninstance_Specs (Par : Entity_Id);
5494 -- Install the scopes of noninstance parent units ending with Par.
5496 procedure Install_Spec (Par : Entity_Id);
5497 -- The child unit is within the declarative part of the parent, so
5498 -- the declarations within the parent are immediately visible.
5500 -----------------------------
5501 -- Install_Formal_Packages --
5502 -----------------------------
5504 procedure Install_Formal_Packages (Par : Entity_Id) is
5508 E := First_Entity (Par);
5510 while Present (E) loop
5512 if Ekind (E) = E_Package
5513 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5515 -- If this is the renaming for the parent instance, done.
5517 if Renamed_Object (E) = Par then
5520 -- The visibility of a formal of an enclosing generic is
5523 elsif Denotes_Formal_Package (E) then
5526 elsif Present (Associated_Formal_Package (E))
5527 and then Box_Present (Parent (Associated_Formal_Package (E)))
5529 Check_Generic_Actuals (Renamed_Object (E), True);
5530 Set_Is_Hidden (E, False);
5536 end Install_Formal_Packages;
5538 -------------------------------
5539 -- Install_Noninstance_Specs --
5540 -------------------------------
5542 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5545 and then Par /= Standard_Standard
5546 and then not In_Open_Scopes (Par)
5548 Install_Noninstance_Specs (Scope (Par));
5551 end Install_Noninstance_Specs;
5557 procedure Install_Spec (Par : Entity_Id) is
5558 Spec : constant Node_Id :=
5559 Specification (Unit_Declaration_Node (Par));
5563 Set_Is_Immediately_Visible (Par);
5564 Install_Visible_Declarations (Par);
5565 Install_Private_Declarations (Par);
5566 Set_Use (Visible_Declarations (Spec));
5567 Set_Use (Private_Declarations (Spec));
5570 -- Start of processing for Install_Parent
5573 -- We need to install the parent instance to compile the instantiation
5574 -- of the child, but the child instance must appear in the current
5575 -- scope. Given that we cannot place the parent above the current
5576 -- scope in the scope stack, we duplicate the current scope and unstack
5577 -- both after the instantiation is complete.
5579 -- If the parent is itself the instantiation of a child unit, we must
5580 -- also stack the instantiation of its parent, and so on. Each such
5581 -- ancestor is the prefix of the name in a prior instantiation.
5583 -- If this is a nested instance, the parent unit itself resolves to
5584 -- a renaming of the parent instance, whose declaration we need.
5586 -- Finally, the parent may be a generic (not an instance) when the
5587 -- child unit appears as a formal package.
5591 if Present (Renamed_Entity (Inst_Par)) then
5592 Inst_Par := Renamed_Entity (Inst_Par);
5595 First_Par := Inst_Par;
5598 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5600 First_Gen := Gen_Par;
5602 while Present (Gen_Par)
5603 and then Is_Child_Unit (Gen_Par)
5605 -- Load grandparent instance as well.
5607 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5609 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5610 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5612 if Present (Renamed_Entity (Inst_Par)) then
5613 Inst_Par := Renamed_Entity (Inst_Par);
5618 (Specification (Unit_Declaration_Node (Inst_Par)));
5620 if Present (Gen_Par) then
5621 Prepend_Elmt (Inst_Par, Ancestors);
5624 -- Parent is not the name of an instantiation.
5626 Install_Noninstance_Specs (Inst_Par);
5638 if Present (First_Gen) then
5639 Append_Elmt (First_Par, Ancestors);
5642 Install_Noninstance_Specs (First_Par);
5645 if not Is_Empty_Elmt_List (Ancestors) then
5646 Elmt := First_Elmt (Ancestors);
5648 while Present (Elmt) loop
5649 Install_Spec (Node (Elmt));
5650 Install_Formal_Packages (Node (Elmt));
5661 --------------------------------
5662 -- Instantiate_Formal_Package --
5663 --------------------------------
5665 function Instantiate_Formal_Package
5668 Analyzed_Formal : Node_Id)
5671 Loc : constant Source_Ptr := Sloc (Actual);
5672 Actual_Pack : Entity_Id;
5673 Formal_Pack : Entity_Id;
5674 Gen_Parent : Entity_Id;
5677 Parent_Spec : Node_Id;
5679 function Formal_Entity
5681 Act_Ent : Entity_Id)
5683 -- Returns the entity associated with the given formal F. In the
5684 -- case where F is a formal package, this function will iterate
5685 -- through all of F's formals and enter map associations from the
5686 -- actuals occurring in the formal package's corresponding actual
5687 -- package (obtained via Act_Ent) to the formal package's formal
5688 -- parameters. This function is called recursively for arbitrary
5689 -- levels of formal packages.
5691 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5692 -- Within the generic part, entities in the formal package are
5693 -- visible. To validate subsequent type declarations, indicate
5694 -- the correspondence betwen the entities in the analyzed formal,
5695 -- and the entities in the actual package. There are three packages
5696 -- involved in the instantiation of a formal package: the parent
5697 -- generic P1 which appears in the generic declaration, the fake
5698 -- instantiation P2 which appears in the analyzed generic, and whose
5699 -- visible entities may be used in subsequent formals, and the actual
5700 -- P3 in the instance. To validate subsequent formals, me indicate
5701 -- that the entities in P2 are mapped into those of P3. The mapping of
5702 -- entities has to be done recursively for nested packages.
5708 function Formal_Entity
5710 Act_Ent : Entity_Id)
5713 Orig_Node : Node_Id := F;
5717 when N_Formal_Object_Declaration =>
5718 return Defining_Identifier (F);
5720 when N_Formal_Type_Declaration =>
5721 return Defining_Identifier (F);
5723 when N_Formal_Subprogram_Declaration =>
5724 return Defining_Unit_Name (Specification (F));
5726 when N_Formal_Package_Declaration |
5727 N_Generic_Package_Declaration =>
5729 if Nkind (F) = N_Generic_Package_Declaration then
5730 Orig_Node := Original_Node (F);
5734 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5735 Formal_Node : Node_Id;
5736 Formal_Ent : Entity_Id;
5738 Gen_Decl : Node_Id :=
5739 Unit_Declaration_Node
5740 (Entity (Name (Orig_Node)));
5741 Formals : List_Id :=
5742 Generic_Formal_Declarations (Gen_Decl);
5745 if Present (Formals) then
5746 Formal_Node := First_Non_Pragma (Formals);
5748 Formal_Node := Empty;
5751 -- As for the loop further below, this loop is making
5752 -- a probably invalid assumption about the correspondence
5753 -- between formals and actuals and eventually needs to
5754 -- corrected to account for cases where the formals are
5755 -- not synchronized and in one-to-one correspondence
5756 -- with actuals. ???
5758 -- What is certain is that for a legal program the
5759 -- presence of actual entities guarantees the existing
5762 while Present (Actual_Ent)
5763 and then Present (Formal_Node)
5764 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5766 -- ??? Are the following calls also needed here:
5768 -- Set_Is_Hidden (Actual_Ent, False);
5769 -- Set_Is_Potentially_Use_Visible
5770 -- (Actual_Ent, In_Use (Act_Ent));
5772 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5773 if Present (Formal_Ent) then
5774 Set_Instance_Of (Formal_Ent, Actual_Ent);
5776 Next_Non_Pragma (Formal_Node);
5778 Next_Entity (Actual_Ent);
5782 return Defining_Identifier (Orig_Node);
5784 when N_Use_Package_Clause =>
5787 when N_Use_Type_Clause =>
5790 -- We return Empty for all other encountered forms of
5791 -- declarations because there are some cases of nonformal
5792 -- sorts of declaration that can show up (e.g., when array
5793 -- formals are present). Since it's not clear what kinds
5794 -- can appear among the formals, we won't raise failure here.
5806 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5811 Set_Instance_Of (Form, Act);
5813 E1 := First_Entity (Form);
5814 E2 := First_Entity (Act);
5816 and then E1 /= First_Private_Entity (Form)
5818 if not Is_Internal (E1)
5819 and then not Is_Class_Wide_Type (E1)
5823 and then Chars (E2) /= Chars (E1)
5831 Set_Instance_Of (E1, E2);
5834 and then Is_Tagged_Type (E2)
5837 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5840 if Ekind (E1) = E_Package
5841 and then No (Renamed_Object (E1))
5843 Map_Entities (E1, E2);
5852 -- Start of processing for Instantiate_Formal_Package
5857 if not Is_Entity_Name (Actual)
5858 or else Ekind (Entity (Actual)) /= E_Package
5861 ("expect package instance to instantiate formal", Actual);
5862 Abandon_Instantiation (Actual);
5863 raise Program_Error;
5866 Actual_Pack := Entity (Actual);
5867 Set_Is_Instantiated (Actual_Pack);
5869 -- The actual may be a renamed package, or an outer generic
5870 -- formal package whose instantiation is converted into a renaming.
5872 if Present (Renamed_Object (Actual_Pack)) then
5873 Actual_Pack := Renamed_Object (Actual_Pack);
5876 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5877 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5878 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5881 Generic_Parent (Specification (Analyzed_Formal));
5883 Defining_Unit_Name (Specification (Analyzed_Formal));
5886 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5887 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5889 Parent_Spec := Parent (Actual_Pack);
5892 if Gen_Parent = Any_Id then
5894 ("previous error in declaration of formal package", Actual);
5895 Abandon_Instantiation (Actual);
5898 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5901 ("actual parameter must be instance of&", Actual, Gen_Parent);
5902 Abandon_Instantiation (Actual);
5905 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5906 Map_Entities (Formal_Pack, Actual_Pack);
5909 Make_Package_Renaming_Declaration (Loc,
5910 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5911 Name => New_Reference_To (Actual_Pack, Loc));
5913 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5914 Defining_Identifier (Formal));
5915 Decls := New_List (Nod);
5917 -- If the formal F has a box, then the generic declarations are
5918 -- visible in the generic G. In an instance of G, the corresponding
5919 -- entities in the actual for F (which are the actuals for the
5920 -- instantiation of the generic that F denotes) must also be made
5921 -- visible for analysis of the current instance. On exit from the
5922 -- current instance, those entities are made private again. If the
5923 -- actual is currently in use, these entities are also use-visible.
5925 -- The loop through the actual entities also steps through the
5926 -- formal entities and enters associations from formals to
5927 -- actuals into the renaming map. This is necessary to properly
5928 -- handle checking of actual parameter associations for later
5929 -- formals that depend on actuals declared in the formal package.
5931 -- This processing needs to be reviewed at some point because
5932 -- it is probably not entirely correct as written. For example
5933 -- there may not be a strict one-to-one correspondence between
5934 -- actuals and formals and this loop is currently assuming that
5937 if Box_Present (Formal) then
5939 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
5940 Formal_Node : Node_Id := Empty;
5941 Formal_Ent : Entity_Id;
5942 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
5943 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
5946 if Present (Formals) then
5947 Formal_Node := First_Non_Pragma (Formals);
5950 while Present (Actual_Ent)
5951 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
5953 Set_Is_Hidden (Actual_Ent, False);
5954 Set_Is_Potentially_Use_Visible
5955 (Actual_Ent, In_Use (Actual_Pack));
5957 if Present (Formal_Node) then
5958 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5960 if Present (Formal_Ent) then
5961 Set_Instance_Of (Formal_Ent, Actual_Ent);
5964 Next_Non_Pragma (Formal_Node);
5967 Next_Entity (Actual_Ent);
5971 -- If the formal is not declared with a box, reanalyze it as
5972 -- an instantiation, to verify the matching rules of 12.7. The
5973 -- actual checks are performed after the generic associations
5978 I_Pack : constant Entity_Id :=
5979 Make_Defining_Identifier (Sloc (Actual),
5980 Chars => New_Internal_Name ('P'));
5983 Set_Is_Internal (I_Pack);
5986 Make_Package_Instantiation (Sloc (Actual),
5987 Defining_Unit_Name => I_Pack,
5988 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
5989 Generic_Associations =>
5990 Generic_Associations (Formal)));
5997 end Instantiate_Formal_Package;
5999 -----------------------------------
6000 -- Instantiate_Formal_Subprogram --
6001 -----------------------------------
6003 function Instantiate_Formal_Subprogram
6006 Analyzed_Formal : Node_Id)
6009 Loc : Source_Ptr := Sloc (Instantiation_Node);
6010 Formal_Sub : constant Entity_Id :=
6011 Defining_Unit_Name (Specification (Formal));
6012 Analyzed_S : constant Entity_Id :=
6013 Defining_Unit_Name (Specification (Analyzed_Formal));
6014 Decl_Node : Node_Id;
6018 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6019 -- If the generic is a child unit, the parent has been installed
6020 -- on the scope stack, but a default subprogram cannot resolve to
6021 -- something on the parent because that parent is not really part
6022 -- of the visible context (it is there to resolve explicit local
6023 -- entities). If the default has resolved in this way, we remove
6024 -- the entity from immediate visibility and analyze the node again
6025 -- to emit an error message or find another visible candidate.
6027 procedure Valid_Actual_Subprogram (Act : Node_Id);
6028 -- Perform legality check and raise exception on failure.
6030 -----------------------
6031 -- From_Parent_Scope --
6032 -----------------------
6034 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6035 Gen_Scope : Node_Id := Scope (Analyzed_S);
6038 while Present (Gen_Scope)
6039 and then Is_Child_Unit (Gen_Scope)
6041 if Scope (Subp) = Scope (Gen_Scope) then
6045 Gen_Scope := Scope (Gen_Scope);
6049 end From_Parent_Scope;
6051 -----------------------------
6052 -- Valid_Actual_Subprogram --
6053 -----------------------------
6055 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6057 if not Is_Entity_Name (Act)
6058 and then Nkind (Act) /= N_Operator_Symbol
6059 and then Nkind (Act) /= N_Attribute_Reference
6060 and then Nkind (Act) /= N_Selected_Component
6061 and then Nkind (Act) /= N_Indexed_Component
6062 and then Nkind (Act) /= N_Character_Literal
6063 and then Nkind (Act) /= N_Explicit_Dereference
6065 if Etype (Act) /= Any_Type then
6067 ("Expect subprogram name to instantiate &",
6068 Instantiation_Node, Formal_Sub);
6071 -- In any case, instantiation cannot continue.
6073 Abandon_Instantiation (Instantiation_Node);
6075 end Valid_Actual_Subprogram;
6077 -- Start of processing for Instantiate_Formal_Subprogram
6080 New_Spec := New_Copy_Tree (Specification (Formal));
6082 -- Create new entity for the actual (New_Copy_Tree does not).
6084 Set_Defining_Unit_Name
6085 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6087 -- Find entity of actual. If the actual is an attribute reference, it
6088 -- cannot be resolved here (its formal is missing) but is handled
6089 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6090 -- fully resolved subsequently, when the renaming declaration for the
6091 -- formal is analyzed. If it is an explicit dereference, resolve the
6092 -- prefix but not the actual itself, to prevent interpretation as a
6095 if Present (Actual) then
6096 Loc := Sloc (Actual);
6097 Set_Sloc (New_Spec, Loc);
6099 if Nkind (Actual) = N_Operator_Symbol then
6100 Find_Direct_Name (Actual);
6102 elsif Nkind (Actual) = N_Explicit_Dereference then
6103 Analyze (Prefix (Actual));
6105 elsif Nkind (Actual) /= N_Attribute_Reference then
6109 Valid_Actual_Subprogram (Actual);
6112 elsif Present (Default_Name (Formal)) then
6114 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6115 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6116 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6117 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6118 and then Present (Entity (Default_Name (Formal)))
6120 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6122 Nam := New_Copy (Default_Name (Formal));
6123 Set_Sloc (Nam, Loc);
6126 elsif Box_Present (Formal) then
6128 -- Actual is resolved at the point of instantiation. Create
6129 -- an identifier or operator with the same name as the formal.
6131 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6132 Nam := Make_Operator_Symbol (Loc,
6133 Chars => Chars (Formal_Sub),
6134 Strval => No_String);
6136 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6141 ("missing actual for instantiation of &",
6142 Instantiation_Node, Formal_Sub);
6143 Abandon_Instantiation (Instantiation_Node);
6147 Make_Subprogram_Renaming_Declaration (Loc,
6148 Specification => New_Spec,
6151 -- Gather possible interpretations for the actual before analyzing the
6152 -- instance. If overloaded, it will be resolved when analyzing the
6153 -- renaming declaration.
6155 if Box_Present (Formal)
6156 and then No (Actual)
6160 if Is_Child_Unit (Scope (Analyzed_S))
6161 and then Present (Entity (Nam))
6163 if not Is_Overloaded (Nam) then
6165 if From_Parent_Scope (Entity (Nam)) then
6166 Set_Is_Immediately_Visible (Entity (Nam), False);
6167 Set_Entity (Nam, Empty);
6168 Set_Etype (Nam, Empty);
6172 Set_Is_Immediately_Visible (Entity (Nam));
6181 Get_First_Interp (Nam, I, It);
6183 while Present (It.Nam) loop
6184 if From_Parent_Scope (It.Nam) then
6188 Get_Next_Interp (I, It);
6195 -- The generic instantiation freezes the actual. This can only be
6196 -- done once the actual is resolved, in the analysis of the renaming
6197 -- declaration. To indicate that must be done, we set the corresponding
6198 -- spec of the node to point to the formal subprogram declaration.
6200 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6202 -- We cannot analyze the renaming declaration, and thus find the
6203 -- actual, until the all the actuals are assembled in the instance.
6204 -- For subsequent checks of other actuals, indicate the node that
6205 -- will hold the instance of this formal.
6207 Set_Instance_Of (Analyzed_S, Nam);
6209 if Nkind (Actual) = N_Selected_Component
6210 and then Is_Task_Type (Etype (Prefix (Actual)))
6211 and then not Is_Frozen (Etype (Prefix (Actual)))
6213 -- The renaming declaration will create a body, which must appear
6214 -- outside of the instantiation, We move the renaming declaration
6215 -- out of the instance, and create an additional renaming inside,
6216 -- to prevent freezing anomalies.
6219 Anon_Id : constant Entity_Id :=
6220 Make_Defining_Identifier
6221 (Loc, New_Internal_Name ('E'));
6223 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6224 Insert_Before (Instantiation_Node, Decl_Node);
6225 Analyze (Decl_Node);
6227 -- Now create renaming within the instance.
6230 Make_Subprogram_Renaming_Declaration (Loc,
6231 Specification => New_Copy_Tree (New_Spec),
6232 Name => New_Occurrence_Of (Anon_Id, Loc));
6234 Set_Defining_Unit_Name (Specification (Decl_Node),
6235 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6240 end Instantiate_Formal_Subprogram;
6242 ------------------------
6243 -- Instantiate_Object --
6244 ------------------------
6246 function Instantiate_Object
6249 Analyzed_Formal : Node_Id)
6252 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6253 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6254 Loc : constant Source_Ptr := Sloc (Actual);
6255 Act_Assoc : constant Node_Id := Parent (Actual);
6256 Orig_Ftyp : constant Entity_Id :=
6257 Etype (Defining_Identifier (Analyzed_Formal));
6259 Decl_Node : Node_Id;
6260 Subt_Decl : Node_Id := Empty;
6261 List : List_Id := New_List;
6264 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6265 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6268 Set_Parent (List, Parent (Actual));
6272 if Out_Present (Formal) then
6274 -- An IN OUT generic actual must be a name. The instantiation is
6275 -- a renaming declaration. The actual is the name being renamed.
6276 -- We use the actual directly, rather than a copy, because it is not
6277 -- used further in the list of actuals, and because a copy or a use
6278 -- of relocate_node is incorrect if the instance is nested within
6279 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6280 -- field links the declaration to the generic association.
6284 ("missing actual for instantiation of &",
6285 Instantiation_Node, Formal_Id);
6286 Abandon_Instantiation (Instantiation_Node);
6290 Make_Object_Renaming_Declaration (Loc,
6291 Defining_Identifier => New_Copy (Formal_Id),
6292 Subtype_Mark => New_Copy_Tree (Type_Id),
6295 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6297 -- The analysis of the actual may produce insert_action nodes, so
6298 -- the declaration must have a context in which to attach them.
6300 Append (Decl_Node, List);
6303 -- This check is performed here because Analyze_Object_Renaming
6304 -- will not check it when Comes_From_Source is False. Note
6305 -- though that the check for the actual being the name of an
6306 -- object will be performed in Analyze_Object_Renaming.
6308 if Is_Object_Reference (Actual)
6309 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6312 ("illegal discriminant-dependent component for in out parameter",
6316 -- The actual has to be resolved in order to check that it is
6317 -- a variable (due to cases such as F(1), where F returns
6318 -- access to an array, and for overloaded prefixes).
6321 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6323 if Is_Private_Type (Ftyp)
6324 and then not Is_Private_Type (Etype (Actual))
6325 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6326 or else Base_Type (Etype (Actual)) = Ftyp)
6328 -- If the actual has the type of the full view of the formal,
6329 -- or else a non-private subtype of the formal, then
6330 -- the visibility of the formal type has changed. Add to the
6331 -- actuals a subtype declaration that will force the exchange
6332 -- of views in the body of the instance as well.
6335 Make_Subtype_Declaration (Loc,
6336 Defining_Identifier =>
6337 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6338 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6340 Prepend (Subt_Decl, List);
6342 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6343 Exchange_Declarations (Ftyp);
6346 Resolve (Actual, Ftyp);
6348 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6350 ("actual for& must be a variable", Actual, Formal_Id);
6352 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6354 "type of actual does not match type of&", Actual, Formal_Id);
6358 Note_Possible_Modification (Actual);
6360 -- Check for instantiation of atomic/volatile actual for
6361 -- non-atomic/volatile formal (RM C.6 (12)).
6363 if Is_Atomic_Object (Actual)
6364 and then not Is_Atomic (Orig_Ftyp)
6367 ("cannot instantiate non-atomic formal object " &
6368 "with atomic actual", Actual);
6370 elsif Is_Volatile_Object (Actual)
6371 and then not Is_Volatile (Orig_Ftyp)
6374 ("cannot instantiate non-volatile formal object " &
6375 "with volatile actual", Actual);
6381 -- The instantiation of a generic formal in-parameter
6382 -- is a constant declaration. The actual is the expression for
6383 -- that declaration.
6385 if Present (Actual) then
6387 Decl_Node := Make_Object_Declaration (Loc,
6388 Defining_Identifier => New_Copy (Formal_Id),
6389 Constant_Present => True,
6390 Object_Definition => New_Copy_Tree (Type_Id),
6391 Expression => Actual);
6393 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6395 -- A generic formal object of a tagged type is defined
6396 -- to be aliased so the new constant must also be treated
6400 (Etype (Defining_Identifier (Analyzed_Formal)))
6402 Set_Aliased_Present (Decl_Node);
6405 Append (Decl_Node, List);
6411 (Etype (Defining_Identifier (Analyzed_Formal)));
6413 Freeze_Before (Instantiation_Node, Typ);
6415 -- If the actual is an aggregate, perform name resolution
6416 -- on its components (the analysis of an aggregate does not
6417 -- do it) to capture local names that may be hidden if the
6418 -- generic is a child unit.
6420 if Nkind (Actual) = N_Aggregate then
6421 Pre_Analyze_And_Resolve (Actual, Typ);
6425 elsif Present (Expression (Formal)) then
6427 -- Use default to construct declaration.
6430 Make_Object_Declaration (Sloc (Formal),
6431 Defining_Identifier => New_Copy (Formal_Id),
6432 Constant_Present => True,
6433 Object_Definition => New_Copy (Type_Id),
6434 Expression => New_Copy_Tree (Expression (Formal)));
6436 Append (Decl_Node, List);
6437 Set_Analyzed (Expression (Decl_Node), False);
6441 ("missing actual for instantiation of &",
6442 Instantiation_Node, Formal_Id);
6443 Abandon_Instantiation (Instantiation_Node);
6449 end Instantiate_Object;
6451 ------------------------------
6452 -- Instantiate_Package_Body --
6453 ------------------------------
6455 procedure Instantiate_Package_Body
6456 (Body_Info : Pending_Body_Info)
6458 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6459 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6460 Loc : constant Source_Ptr := Sloc (Inst_Node);
6462 Gen_Id : constant Node_Id := Name (Inst_Node);
6463 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6464 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6465 Act_Spec : constant Node_Id := Specification (Act_Decl);
6466 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6468 Act_Body_Name : Node_Id;
6470 Gen_Body_Id : Node_Id;
6472 Act_Body_Id : Entity_Id;
6474 Parent_Installed : Boolean := False;
6475 Save_Style_Check : Boolean := Style_Check;
6478 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6479 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6481 if No (Gen_Body_Id) then
6482 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6483 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6486 -- Establish global variable for sloc adjustment and for error
6489 Instantiation_Node := Inst_Node;
6491 if Present (Gen_Body_Id) then
6492 Save_Env (Gen_Unit, Act_Decl_Id);
6493 Style_Check := False;
6494 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6496 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6498 Create_Instantiation_Source
6499 (Inst_Node, Gen_Body_Id, S_Adjustment);
6503 (Original_Node (Gen_Body), Empty, Instantiating => True);
6505 -- Build new name (possibly qualified) for body declaration.
6507 Act_Body_Id := New_Copy (Act_Decl_Id);
6509 -- Some attributes of the spec entity are not inherited by the
6512 Set_Handler_Records (Act_Body_Id, No_List);
6514 if Nkind (Defining_Unit_Name (Act_Spec)) =
6515 N_Defining_Program_Unit_Name
6518 Make_Defining_Program_Unit_Name (Loc,
6519 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6520 Defining_Identifier => Act_Body_Id);
6522 Act_Body_Name := Act_Body_Id;
6525 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6527 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6528 Check_Generic_Actuals (Act_Decl_Id, False);
6530 -- If it is a child unit, make the parent instance (which is an
6531 -- instance of the parent of the generic) visible. The parent
6532 -- instance is the prefix of the name of the generic unit.
6534 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6535 and then Nkind (Gen_Id) = N_Expanded_Name
6537 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6538 Parent_Installed := True;
6540 elsif Is_Child_Unit (Gen_Unit) then
6541 Install_Parent (Scope (Gen_Unit), In_Body => True);
6542 Parent_Installed := True;
6545 -- If the instantiation is a library unit, and this is the main
6546 -- unit, then build the resulting compilation unit nodes for the
6547 -- instance. If this is a compilation unit but it is not the main
6548 -- unit, then it is the body of a unit in the context, that is being
6549 -- compiled because it is encloses some inlined unit or another
6550 -- generic unit being instantiated. In that case, this body is not
6551 -- part of the current compilation, and is not attached to the tree,
6552 -- but its parent must be set for analysis.
6554 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6556 if Parent (Inst_Node) = Cunit (Main_Unit) then
6557 Build_Instance_Compilation_Unit_Nodes
6558 (Inst_Node, Act_Body, Act_Decl);
6559 Analyze (Inst_Node);
6561 -- If the instance is a child unit itself, then set the
6562 -- scope of the expanded body to be the parent of the
6563 -- instantiation (ensuring that the fully qualified name
6564 -- will be generated for the elaboration subprogram).
6566 if Nkind (Defining_Unit_Name (Act_Spec)) =
6567 N_Defining_Program_Unit_Name
6570 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6574 Set_Parent (Act_Body, Parent (Inst_Node));
6578 -- Case where instantiation is not a library unit
6581 -- If this is an early instantiation, i.e. appears textually
6582 -- before the corresponding body and must be elaborated first,
6583 -- indicate that the body instance is to be delayed.
6585 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6587 -- Now analyze the body. We turn off all checks if this is
6588 -- an internal unit, since there is no reason to have checks
6589 -- on for any predefined run-time library code. All such
6590 -- code is designed to be compiled with checks off.
6592 -- Note that we do NOT apply this criterion to children of
6593 -- GNAT (or on VMS, children of DEC). The latter units must
6594 -- suppress checks explicitly if this is needed.
6596 if Is_Predefined_File_Name
6597 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6599 Analyze (Act_Body, Suppress => All_Checks);
6605 if not Generic_Separately_Compiled (Gen_Unit) then
6606 Inherit_Context (Gen_Body, Inst_Node);
6609 Restore_Private_Views (Act_Decl_Id);
6611 Style_Check := Save_Style_Check;
6613 -- If we have no body, and the unit requires a body, then complain.
6614 -- This complaint is suppressed if we have detected other errors
6615 -- (since a common reason for missing the body is that it had errors).
6617 elsif Unit_Requires_Body (Gen_Unit) then
6618 if Errors_Detected = 0 then
6620 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6622 -- Don't attempt to perform any cleanup actions if some other
6623 -- error was aready detected, since this can cause blowups.
6629 -- Case of package that does not need a body
6632 -- If the instantiation of the declaration is a library unit,
6633 -- rewrite the original package instantiation as a package
6634 -- declaration in the compilation unit node.
6636 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6637 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6638 Rewrite (Inst_Node, Act_Decl);
6640 -- If the instantiation is not a library unit, then append the
6641 -- declaration to the list of implicitly generated entities.
6642 -- unless it is already a list member which means that it was
6643 -- already processed
6645 elsif not Is_List_Member (Act_Decl) then
6646 Mark_Rewrite_Insertion (Act_Decl);
6647 Insert_Before (Inst_Node, Act_Decl);
6651 Expander_Mode_Restore;
6653 -- Remove the parent instances if they have been placed on the
6654 -- scope stack to compile the body.
6656 if Parent_Installed then
6657 Remove_Parent (In_Body => True);
6659 end Instantiate_Package_Body;
6661 ---------------------------------
6662 -- Instantiate_Subprogram_Body --
6663 ---------------------------------
6665 procedure Instantiate_Subprogram_Body
6666 (Body_Info : Pending_Body_Info)
6668 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6669 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6670 Loc : constant Source_Ptr := Sloc (Inst_Node);
6673 Gen_Id : constant Node_Id := Name (Inst_Node);
6674 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6675 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6676 Anon_Id : constant Entity_Id :=
6677 Defining_Unit_Name (Specification (Act_Decl));
6679 Gen_Body_Id : Node_Id;
6681 Act_Body_Id : Entity_Id;
6682 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6683 Pack_Body : Node_Id;
6684 Prev_Formal : Entity_Id;
6685 Unit_Renaming : Node_Id;
6687 Parent_Installed : Boolean := False;
6688 Save_Style_Check : Boolean := Style_Check;
6691 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6693 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6695 if No (Gen_Body_Id) then
6696 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6697 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6700 Instantiation_Node := Inst_Node;
6702 if Present (Gen_Body_Id) then
6703 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6705 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6707 -- Either body is not present, or context is non-expanding, as
6708 -- when compiling a subunit. Mark the instance as completed.
6710 Set_Has_Completion (Anon_Id);
6714 Save_Env (Gen_Unit, Anon_Id);
6715 Style_Check := False;
6716 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6717 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6721 (Original_Node (Gen_Body), Empty, Instantiating => True);
6722 Act_Body_Id := Defining_Entity (Act_Body);
6723 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6724 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6725 Set_Corresponding_Spec (Act_Body, Anon_Id);
6726 Set_Has_Completion (Anon_Id);
6727 Check_Generic_Actuals (Pack_Id, False);
6729 -- If it is a child unit, make the parent instance (which is an
6730 -- instance of the parent of the generic) visible. The parent
6731 -- instance is the prefix of the name of the generic unit.
6733 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6734 and then Nkind (Gen_Id) = N_Expanded_Name
6736 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6737 Parent_Installed := True;
6739 elsif Is_Child_Unit (Gen_Unit) then
6740 Install_Parent (Scope (Gen_Unit), In_Body => True);
6741 Parent_Installed := True;
6744 -- Inside its body, a reference to the generic unit is a reference
6745 -- to the instance. The corresponding renaming is the first
6746 -- declaration in the body.
6749 Make_Subprogram_Renaming_Declaration (Loc,
6752 Specification (Original_Node (Gen_Body)),
6754 Instantiating => True),
6755 Name => New_Occurrence_Of (Anon_Id, Loc));
6757 -- If there is a formal subprogram with the same name as the
6758 -- unit itself, do not add this renaming declaration. This is
6759 -- a temporary fix for one ACVC test. ???
6761 Prev_Formal := First_Entity (Pack_Id);
6762 while Present (Prev_Formal) loop
6763 if Chars (Prev_Formal) = Chars (Gen_Unit)
6764 and then Is_Overloadable (Prev_Formal)
6769 Next_Entity (Prev_Formal);
6772 if Present (Prev_Formal) then
6773 Decls := New_List (Act_Body);
6775 Decls := New_List (Unit_Renaming, Act_Body);
6778 -- The subprogram body is placed in the body of a dummy package
6779 -- body, whose spec contains the subprogram declaration as well
6780 -- as the renaming declarations for the generic parameters.
6782 Pack_Body := Make_Package_Body (Loc,
6783 Defining_Unit_Name => New_Copy (Pack_Id),
6784 Declarations => Decls);
6786 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6788 -- If the instantiation is a library unit, then build resulting
6789 -- compilation unit nodes for the instance. The declaration of
6790 -- the enclosing package is the grandparent of the subprogram
6791 -- declaration. First replace the instantiation node as the unit
6792 -- of the corresponding compilation.
6794 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6796 if Parent (Inst_Node) = Cunit (Main_Unit) then
6797 Set_Unit (Parent (Inst_Node), Inst_Node);
6798 Build_Instance_Compilation_Unit_Nodes
6799 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6800 Analyze (Inst_Node);
6802 Set_Parent (Pack_Body, Parent (Inst_Node));
6803 Analyze (Pack_Body);
6807 Insert_Before (Inst_Node, Pack_Body);
6808 Mark_Rewrite_Insertion (Pack_Body);
6809 Analyze (Pack_Body);
6811 if Expander_Active then
6812 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6816 if not Generic_Separately_Compiled (Gen_Unit) then
6817 Inherit_Context (Gen_Body, Inst_Node);
6820 Restore_Private_Views (Pack_Id, False);
6822 if Parent_Installed then
6823 Remove_Parent (In_Body => True);
6827 Style_Check := Save_Style_Check;
6829 -- Body not found. Error was emitted already. If there were no
6830 -- previous errors, this may be an instance whose scope is a premature
6831 -- instance. In that case we must insure that the (legal) program does
6832 -- raise program error if executed. We generate a subprogram body for
6833 -- this purpose. See DEC ac30vso.
6835 elsif Errors_Detected = 0
6836 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6838 if Ekind (Anon_Id) = E_Procedure then
6840 Make_Subprogram_Body (Loc,
6842 Make_Procedure_Specification (Loc,
6843 Defining_Unit_Name => New_Copy (Anon_Id),
6844 Parameter_Specifications =>
6846 (Parameter_Specifications (Parent (Anon_Id)))),
6848 Declarations => Empty_List,
6849 Handled_Statement_Sequence =>
6850 Make_Handled_Sequence_Of_Statements (Loc,
6852 New_List (Make_Raise_Program_Error (Loc))));
6855 Make_Subprogram_Body (Loc,
6857 Make_Function_Specification (Loc,
6858 Defining_Unit_Name => New_Copy (Anon_Id),
6859 Parameter_Specifications =>
6861 (Parameter_Specifications (Parent (Anon_Id))),
6863 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6865 Declarations => Empty_List,
6866 Handled_Statement_Sequence =>
6867 Make_Handled_Sequence_Of_Statements (Loc,
6868 Statements => New_List (
6869 Make_Return_Statement (Loc,
6870 Expression => Make_Raise_Program_Error (Loc)))));
6873 Pack_Body := Make_Package_Body (Loc,
6874 Defining_Unit_Name => New_Copy (Pack_Id),
6875 Declarations => New_List (Act_Body));
6877 Insert_After (Inst_Node, Pack_Body);
6878 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6879 Analyze (Pack_Body);
6882 Expander_Mode_Restore;
6883 end Instantiate_Subprogram_Body;
6885 ----------------------
6886 -- Instantiate_Type --
6887 ----------------------
6889 function Instantiate_Type
6892 Analyzed_Formal : Node_Id)
6895 Loc : constant Source_Ptr := Sloc (Actual);
6896 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6897 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6898 Ancestor : Entity_Id;
6899 Def : constant Node_Id := Formal_Type_Definition (Formal);
6901 Decl_Node : Node_Id;
6903 procedure Validate_Array_Type_Instance;
6904 procedure Validate_Access_Subprogram_Instance;
6905 procedure Validate_Access_Type_Instance;
6906 procedure Validate_Derived_Type_Instance;
6907 procedure Validate_Private_Type_Instance;
6908 -- These procedures perform validation tests for the named case
6910 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6911 -- Check that base types are the same and that the subtypes match
6912 -- statically. Used in several of the above.
6914 --------------------
6915 -- Subtypes_Match --
6916 --------------------
6918 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
6919 T : constant Entity_Id := Get_Instance_Of (Gen_T);
6922 return (Base_Type (T) = Base_Type (Act_T)
6923 -- why is the and then commented out here???
6924 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
6925 and then Subtypes_Statically_Match (T, Act_T))
6927 or else (Is_Class_Wide_Type (Gen_T)
6928 and then Is_Class_Wide_Type (Act_T)
6931 Get_Instance_Of (Root_Type (Gen_T)),
6932 Root_Type (Act_T)));
6935 -----------------------------------------
6936 -- Validate_Access_Subprogram_Instance --
6937 -----------------------------------------
6939 procedure Validate_Access_Subprogram_Instance is
6941 if not Is_Access_Type (Act_T)
6942 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
6945 ("expect access type in instantiation of &", Actual, Gen_T);
6946 Abandon_Instantiation (Actual);
6949 Check_Mode_Conformant
6950 (Designated_Type (Act_T),
6951 Designated_Type (A_Gen_T),
6955 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
6956 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
6958 ("protected access type not allowed for formal &",
6962 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
6964 ("expect protected access type for formal &",
6967 end Validate_Access_Subprogram_Instance;
6969 -----------------------------------
6970 -- Validate_Access_Type_Instance --
6971 -----------------------------------
6973 procedure Validate_Access_Type_Instance is
6974 Desig_Type : Entity_Id :=
6975 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
6978 if not Is_Access_Type (Act_T) then
6980 ("expect access type in instantiation of &", Actual, Gen_T);
6981 Abandon_Instantiation (Actual);
6984 if Is_Access_Constant (A_Gen_T) then
6985 if not Is_Access_Constant (Act_T) then
6987 ("actual type must be access-to-constant type", Actual);
6988 Abandon_Instantiation (Actual);
6991 if Is_Access_Constant (Act_T) then
6993 ("actual type must be access-to-variable type", Actual);
6994 Abandon_Instantiation (Actual);
6996 elsif Ekind (A_Gen_T) = E_General_Access_Type
6997 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
6999 Error_Msg_N ("actual must be general access type!", Actual);
7000 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7001 Abandon_Instantiation (Actual);
7005 -- The designated subtypes, that is to say the subtypes introduced
7006 -- by an access type declaration (and not by a subtype declaration)
7009 if not Subtypes_Match
7010 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7013 ("designated type of actual does not match that of formal &",
7015 Abandon_Instantiation (Actual);
7017 elsif Is_Access_Type (Designated_Type (Act_T))
7018 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7020 Is_Constrained (Designated_Type (Desig_Type))
7023 ("designated type of actual does not match that of formal &",
7025 Abandon_Instantiation (Actual);
7027 end Validate_Access_Type_Instance;
7029 ----------------------------------
7030 -- Validate_Array_Type_Instance --
7031 ----------------------------------
7033 procedure Validate_Array_Type_Instance is
7038 function Formal_Dimensions return Int;
7039 -- Count number of dimensions in array type formal
7041 function Formal_Dimensions return Int is
7046 if Nkind (Def) = N_Constrained_Array_Definition then
7047 Index := First (Discrete_Subtype_Definitions (Def));
7049 Index := First (Subtype_Marks (Def));
7052 while Present (Index) loop
7058 end Formal_Dimensions;
7060 -- Start of processing for Validate_Array_Type_Instance
7063 if not Is_Array_Type (Act_T) then
7065 ("expect array type in instantiation of &", Actual, Gen_T);
7066 Abandon_Instantiation (Actual);
7068 elsif Nkind (Def) = N_Constrained_Array_Definition then
7069 if not (Is_Constrained (Act_T)) then
7071 ("expect constrained array in instantiation of &",
7073 Abandon_Instantiation (Actual);
7077 if Is_Constrained (Act_T) then
7079 ("expect unconstrained array in instantiation of &",
7081 Abandon_Instantiation (Actual);
7085 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7087 ("dimensions of actual do not match formal &", Actual, Gen_T);
7088 Abandon_Instantiation (Actual);
7091 I1 := First_Index (A_Gen_T);
7092 I2 := First_Index (Act_T);
7093 for J in 1 .. Formal_Dimensions loop
7095 -- If the indices of the actual were given by a subtype_mark,
7096 -- the index was transformed into a range attribute. Retrieve
7097 -- the original type mark for checking.
7099 if Is_Entity_Name (Original_Node (I2)) then
7100 T2 := Entity (Original_Node (I2));
7105 if not Subtypes_Match
7106 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7109 ("index types of actual do not match those of formal &",
7111 Abandon_Instantiation (Actual);
7118 if not Subtypes_Match (
7119 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7120 Component_Type (Act_T))
7123 ("component subtype of actual does not match that of formal &",
7125 Abandon_Instantiation (Actual);
7128 if Has_Aliased_Components (A_Gen_T)
7129 and then not Has_Aliased_Components (Act_T)
7132 ("actual must have aliased components to match formal type &",
7136 end Validate_Array_Type_Instance;
7138 ------------------------------------
7139 -- Validate_Derived_Type_Instance --
7140 ------------------------------------
7142 procedure Validate_Derived_Type_Instance is
7143 Actual_Discr : Entity_Id;
7144 Ancestor_Discr : Entity_Id;
7147 -- If the parent type in the generic declaration is itself
7148 -- a previous formal type, then it is local to the generic
7149 -- and absent from the analyzed generic definition. In that
7150 -- case the ancestor is the instance of the formal (which must
7151 -- have been instantiated previously). Otherwise, the analyzed
7152 -- generic carries the parent type. If the parent type is defined
7153 -- in a previous formal package, then the scope of that formal
7154 -- package is that of the generic type itself, and it has already
7155 -- been mapped into the corresponding type in the actual package.
7157 -- Common case: parent type defined outside of the generic.
7159 if Is_Entity_Name (Subtype_Mark (Def))
7160 and then Present (Entity (Subtype_Mark (Def)))
7162 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7164 -- Check whether parent is defined in a previous formal package.
7167 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7170 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7172 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) then
7174 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7177 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7180 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7182 ("expect type derived from & in instantiation",
7183 Actual, First_Subtype (Ancestor));
7184 Abandon_Instantiation (Actual);
7187 -- Perform atomic/volatile checks (RM C.6(12))
7189 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7191 ("cannot have atomic actual type for non-atomic formal type",
7194 elsif Is_Volatile (Act_T)
7195 and then not Is_Volatile (Ancestor)
7196 and then Is_By_Reference_Type (Ancestor)
7199 ("cannot have volatile actual type for non-volatile formal type",
7203 -- It should not be necessary to check for unknown discriminants
7204 -- on Formal, but for some reason Has_Unknown_Discriminants is
7205 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7206 -- returns False. This needs fixing. ???
7208 if not Is_Indefinite_Subtype (A_Gen_T)
7209 and then not Unknown_Discriminants_Present (Formal)
7210 and then Is_Indefinite_Subtype (Act_T)
7213 ("actual subtype must be constrained", Actual);
7214 Abandon_Instantiation (Actual);
7217 if not Unknown_Discriminants_Present (Formal) then
7218 if Is_Constrained (Ancestor) then
7219 if not Is_Constrained (Act_T) then
7221 ("actual subtype must be constrained", Actual);
7222 Abandon_Instantiation (Actual);
7225 -- Ancestor is unconstrained
7227 elsif Is_Constrained (Act_T) then
7228 if Ekind (Ancestor) = E_Access_Type
7229 or else Is_Composite_Type (Ancestor)
7232 ("actual subtype must be unconstrained", Actual);
7233 Abandon_Instantiation (Actual);
7236 -- A class-wide type is only allowed if the formal has
7237 -- unknown discriminants.
7239 elsif Is_Class_Wide_Type (Act_T)
7240 and then not Has_Unknown_Discriminants (Ancestor)
7243 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7244 Abandon_Instantiation (Actual);
7246 -- Otherwise, the formal and actual shall have the same
7247 -- number of discriminants and each discriminant of the
7248 -- actual must correspond to a discriminant of the formal.
7250 elsif Has_Discriminants (Act_T)
7251 and then Has_Discriminants (Ancestor)
7253 Actual_Discr := First_Discriminant (Act_T);
7254 Ancestor_Discr := First_Discriminant (Ancestor);
7255 while Present (Actual_Discr)
7256 and then Present (Ancestor_Discr)
7258 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7259 not Present (Corresponding_Discriminant (Actual_Discr))
7262 ("discriminant & does not correspond " &
7263 "to ancestor discriminant", Actual, Actual_Discr);
7264 Abandon_Instantiation (Actual);
7267 Next_Discriminant (Actual_Discr);
7268 Next_Discriminant (Ancestor_Discr);
7271 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7273 ("actual for & must have same number of discriminants",
7275 Abandon_Instantiation (Actual);
7278 -- This case should be caught by the earlier check for
7279 -- for constrainedness, but the check here is added for
7282 elsif Has_Discriminants (Act_T) then
7284 ("actual for & must not have discriminants", Actual, Gen_T);
7285 Abandon_Instantiation (Actual);
7287 elsif Has_Discriminants (Ancestor) then
7289 ("actual for & must have known discriminants", Actual, Gen_T);
7290 Abandon_Instantiation (Actual);
7293 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7295 ("constraint on actual is incompatible with formal", Actual);
7296 Abandon_Instantiation (Actual);
7300 end Validate_Derived_Type_Instance;
7302 ------------------------------------
7303 -- Validate_Private_Type_Instance --
7304 ------------------------------------
7306 procedure Validate_Private_Type_Instance is
7307 Formal_Discr : Entity_Id;
7308 Actual_Discr : Entity_Id;
7309 Formal_Subt : Entity_Id;
7312 if (Is_Limited_Type (Act_T)
7313 or else Is_Limited_Composite (Act_T))
7314 and then not Is_Limited_Type (A_Gen_T)
7317 ("actual for non-limited & cannot be a limited type", Actual,
7319 Abandon_Instantiation (Actual);
7321 elsif Is_Indefinite_Subtype (Act_T)
7322 and then not Is_Indefinite_Subtype (A_Gen_T)
7326 ("actual for & must be a definite subtype", Actual, Gen_T);
7328 elsif not Is_Tagged_Type (Act_T)
7329 and then Is_Tagged_Type (A_Gen_T)
7332 ("actual for & must be a tagged type", Actual, Gen_T);
7334 elsif Has_Discriminants (A_Gen_T) then
7335 if not Has_Discriminants (Act_T) then
7337 ("actual for & must have discriminants", Actual, Gen_T);
7338 Abandon_Instantiation (Actual);
7340 elsif Is_Constrained (Act_T) then
7342 ("actual for & must be unconstrained", Actual, Gen_T);
7343 Abandon_Instantiation (Actual);
7346 Formal_Discr := First_Discriminant (A_Gen_T);
7347 Actual_Discr := First_Discriminant (Act_T);
7348 while Formal_Discr /= Empty loop
7349 if Actual_Discr = Empty then
7351 ("discriminants on actual do not match formal",
7353 Abandon_Instantiation (Actual);
7356 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7358 -- access discriminants match if designated types do.
7360 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7361 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7362 = E_Anonymous_Access_Type
7363 and then Get_Instance_Of (
7364 Designated_Type (Base_Type (Formal_Subt)))
7365 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7369 elsif Base_Type (Formal_Subt) /=
7370 Base_Type (Etype (Actual_Discr))
7373 ("types of actual discriminants must match formal",
7375 Abandon_Instantiation (Actual);
7377 elsif not Subtypes_Statically_Match
7378 (Formal_Subt, Etype (Actual_Discr))
7382 ("subtypes of actual discriminants must match formal",
7384 Abandon_Instantiation (Actual);
7387 Next_Discriminant (Formal_Discr);
7388 Next_Discriminant (Actual_Discr);
7391 if Actual_Discr /= Empty then
7393 ("discriminants on actual do not match formal",
7395 Abandon_Instantiation (Actual);
7402 end Validate_Private_Type_Instance;
7404 -- Start of processing for Instantiate_Type
7407 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7408 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7411 elsif not Is_Entity_Name (Actual)
7412 or else not Is_Type (Entity (Actual))
7415 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7416 Abandon_Instantiation (Actual);
7419 Act_T := Entity (Actual);
7421 if Ekind (Act_T) = E_Incomplete_Type then
7422 if No (Underlying_Type (Act_T)) then
7423 Error_Msg_N ("premature use of incomplete type", Actual);
7424 Abandon_Instantiation (Actual);
7426 Act_T := Full_View (Act_T);
7427 Set_Entity (Actual, Act_T);
7429 if Has_Private_Component (Act_T) then
7431 ("premature use of type with private component", Actual);
7435 elsif Is_Private_Type (Act_T)
7436 and then Is_Private_Type (Base_Type (Act_T))
7437 and then not Is_Generic_Type (Act_T)
7438 and then not Is_Derived_Type (Act_T)
7439 and then No (Full_View (Root_Type (Act_T)))
7441 Error_Msg_N ("premature use of private type", Actual);
7443 elsif Has_Private_Component (Act_T) then
7445 ("premature use of type with private component", Actual);
7448 Set_Instance_Of (A_Gen_T, Act_T);
7450 -- If the type is generic, the class-wide type may also be used
7452 if Is_Tagged_Type (A_Gen_T)
7453 and then Is_Tagged_Type (Act_T)
7454 and then not Is_Class_Wide_Type (A_Gen_T)
7456 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7457 Class_Wide_Type (Act_T));
7460 if not Is_Abstract (A_Gen_T)
7461 and then Is_Abstract (Act_T)
7464 ("actual of non-abstract formal cannot be abstract", Actual);
7467 if Is_Scalar_Type (Gen_T) then
7468 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7473 when N_Formal_Private_Type_Definition =>
7474 Validate_Private_Type_Instance;
7476 when N_Formal_Derived_Type_Definition =>
7477 Validate_Derived_Type_Instance;
7479 when N_Formal_Discrete_Type_Definition =>
7480 if not Is_Discrete_Type (Act_T) then
7482 ("expect discrete type in instantiation of&", Actual, Gen_T);
7483 Abandon_Instantiation (Actual);
7486 when N_Formal_Signed_Integer_Type_Definition =>
7487 if not Is_Signed_Integer_Type (Act_T) then
7489 ("expect signed integer type in instantiation of&",
7491 Abandon_Instantiation (Actual);
7494 when N_Formal_Modular_Type_Definition =>
7495 if not Is_Modular_Integer_Type (Act_T) then
7497 ("expect modular type in instantiation of &", Actual, Gen_T);
7498 Abandon_Instantiation (Actual);
7501 when N_Formal_Floating_Point_Definition =>
7502 if not Is_Floating_Point_Type (Act_T) then
7504 ("expect float type in instantiation of &", Actual, Gen_T);
7505 Abandon_Instantiation (Actual);
7508 when N_Formal_Ordinary_Fixed_Point_Definition =>
7509 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7511 ("expect ordinary fixed point type in instantiation of &",
7513 Abandon_Instantiation (Actual);
7516 when N_Formal_Decimal_Fixed_Point_Definition =>
7517 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7519 ("expect decimal type in instantiation of &",
7521 Abandon_Instantiation (Actual);
7524 when N_Array_Type_Definition =>
7525 Validate_Array_Type_Instance;
7527 when N_Access_To_Object_Definition =>
7528 Validate_Access_Type_Instance;
7530 when N_Access_Function_Definition |
7531 N_Access_Procedure_Definition =>
7532 Validate_Access_Subprogram_Instance;
7535 raise Program_Error;
7540 Make_Subtype_Declaration (Loc,
7541 Defining_Identifier => New_Copy (Gen_T),
7542 Subtype_Indication => New_Reference_To (Act_T, Loc));
7544 if Is_Private_Type (Act_T) then
7545 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7548 -- Flag actual derived types so their elaboration produces the
7549 -- appropriate renamings for the primitive operations of the ancestor.
7550 -- Flag actual for formal private types as well, to determine whether
7551 -- operations in the private part may override inherited operations.
7553 if Nkind (Def) = N_Formal_Derived_Type_Definition
7554 or else Nkind (Def) = N_Formal_Private_Type_Definition
7556 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7560 end Instantiate_Type;
7562 ---------------------
7563 -- Is_In_Main_Unit --
7564 ---------------------
7566 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7567 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7569 Current_Unit : Node_Id;
7572 if Unum = Main_Unit then
7575 -- If the current unit is a subunit then it is either the main unit
7576 -- or is being compiled as part of the main unit.
7578 elsif Nkind (N) = N_Compilation_Unit then
7579 return Nkind (Unit (N)) = N_Subunit;
7582 Current_Unit := Parent (N);
7583 while Present (Current_Unit)
7584 and then Nkind (Current_Unit) /= N_Compilation_Unit
7586 Current_Unit := Parent (Current_Unit);
7589 -- The instantiation node is in the main unit, or else the current
7590 -- node (perhaps as the result of nested instantiations) is in the
7591 -- main unit, or in the declaration of the main unit, which in this
7592 -- last case must be a body.
7594 return Unum = Main_Unit
7595 or else Current_Unit = Cunit (Main_Unit)
7596 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7597 or else (Present (Library_Unit (Current_Unit))
7598 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7599 end Is_In_Main_Unit;
7601 ----------------------------
7602 -- Load_Parent_Of_Generic --
7603 ----------------------------
7605 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7606 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7607 True_Parent : Node_Id;
7608 Inst_Node : Node_Id;
7610 Save_Style_Check : Boolean := Style_Check;
7613 if not In_Same_Source_Unit (N, Spec)
7614 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7615 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7616 and then not Is_In_Main_Unit (Spec))
7618 -- Find body of parent of spec, and analyze it. A special case
7619 -- arises when the parent is an instantiation, that is to say when
7620 -- we are currently instantiating a nested generic. In that case,
7621 -- there is no separate file for the body of the enclosing instance.
7622 -- Instead, the enclosing body must be instantiated as if it were
7623 -- a pending instantiation, in order to produce the body for the
7624 -- nested generic we require now. Note that in that case the
7625 -- generic may be defined in a package body, the instance defined
7626 -- in the same package body, and the original enclosing body may not
7627 -- be in the main unit.
7629 True_Parent := Parent (Spec);
7632 while Present (True_Parent)
7633 and then Nkind (True_Parent) /= N_Compilation_Unit
7635 if Nkind (True_Parent) = N_Package_Declaration
7637 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7639 -- Parent is a compilation unit that is an instantiation.
7640 -- Instantiation node has been replaced with package decl.
7642 Inst_Node := Original_Node (True_Parent);
7645 elsif Nkind (True_Parent) = N_Package_Declaration
7646 and then Present (Generic_Parent (Specification (True_Parent)))
7648 -- Parent is an instantiation within another specification.
7649 -- Declaration for instance has been inserted before original
7650 -- instantiation node. A direct link would be preferable?
7652 Inst_Node := Next (True_Parent);
7654 while Present (Inst_Node)
7655 and then Nkind (Inst_Node) /= N_Package_Instantiation
7660 -- If the instance appears within a generic, and the generic
7661 -- unit is defined within a formal package of the enclosing
7662 -- generic, there is no generic body available, and none
7663 -- needed. A more precise test should be used ???
7665 if No (Inst_Node) then
7671 True_Parent := Parent (True_Parent);
7675 if Present (Inst_Node) then
7677 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7679 -- Instantiation node and declaration of instantiated package
7680 -- were exchanged when only the declaration was needed.
7681 -- Restore instantiation node before proceeding with body.
7683 Set_Unit (Parent (True_Parent), Inst_Node);
7686 -- Now complete instantiation of enclosing body, if it appears
7687 -- in some other unit. If it appears in the current unit, the
7688 -- body will have been instantiated already.
7690 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7691 Instantiate_Package_Body
7692 (Pending_Body_Info'(
7693 Inst_Node, True_Parent, Expander_Active,
7694 Get_Code_Unit (Sloc (Inst_Node))));
7698 Opt.Style_Check := False;
7699 Load_Needed_Body (Comp_Unit, OK);
7700 Opt.Style_Check := Save_Style_Check;
7703 and then Unit_Requires_Body (Defining_Entity (Spec))
7706 Bname : constant Unit_Name_Type :=
7707 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7710 Error_Msg_Unit_1 := Bname;
7711 Error_Msg_N ("this instantiation requires$!", N);
7713 Get_File_Name (Bname, Subunit => False);
7714 Error_Msg_N ("\but file{ was not found!", N);
7715 raise Unrecoverable_Error;
7721 -- If loading the parent of the generic caused an instantiation
7722 -- circularity, we abandon compilation at this point, because
7723 -- otherwise in some cases we get into trouble with infinite
7724 -- recursions after this point.
7726 if Circularity_Detected then
7727 raise Unrecoverable_Error;
7730 end Load_Parent_Of_Generic;
7732 -----------------------
7733 -- Move_Freeze_Nodes --
7734 -----------------------
7736 procedure Move_Freeze_Nodes
7737 (Out_Of : Entity_Id;
7742 Next_Decl : Node_Id;
7743 Next_Node : Node_Id := After;
7746 function Is_Outer_Type (T : Entity_Id) return Boolean;
7747 -- Check whether entity is declared in a scope external to that
7748 -- of the generic unit.
7754 function Is_Outer_Type (T : Entity_Id) return Boolean is
7755 Scop : Entity_Id := Scope (T);
7758 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7762 while Scop /= Standard_Standard loop
7764 if Scop = Out_Of then
7767 Scop := Scope (Scop);
7775 -- Start of processing for Move_Freeze_Nodes
7782 -- First remove the freeze nodes that may appear before all other
7786 while Present (Decl)
7787 and then Nkind (Decl) = N_Freeze_Entity
7788 and then Is_Outer_Type (Entity (Decl))
7790 Decl := Remove_Head (L);
7791 Insert_After (Next_Node, Decl);
7792 Set_Analyzed (Decl, False);
7797 -- Next scan the list of declarations and remove each freeze node that
7798 -- appears ahead of the current node.
7800 while Present (Decl) loop
7801 while Present (Next (Decl))
7802 and then Nkind (Next (Decl)) = N_Freeze_Entity
7803 and then Is_Outer_Type (Entity (Next (Decl)))
7805 Next_Decl := Remove_Next (Decl);
7806 Insert_After (Next_Node, Next_Decl);
7807 Set_Analyzed (Next_Decl, False);
7808 Next_Node := Next_Decl;
7811 -- If the declaration is a nested package or concurrent type, then
7812 -- recurse. Nested generic packages will have been processed from the
7815 if Nkind (Decl) = N_Package_Declaration then
7816 Spec := Specification (Decl);
7818 elsif Nkind (Decl) = N_Task_Type_Declaration then
7819 Spec := Task_Definition (Decl);
7821 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7822 Spec := Protected_Definition (Decl);
7828 if Present (Spec) then
7829 Move_Freeze_Nodes (Out_Of, Next_Node,
7830 Visible_Declarations (Spec));
7831 Move_Freeze_Nodes (Out_Of, Next_Node,
7832 Private_Declarations (Spec));
7837 end Move_Freeze_Nodes;
7843 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7845 return Generic_Renamings.Table (E).Next_In_HTable;
7848 ------------------------
7849 -- Preanalyze_Actuals --
7850 ------------------------
7852 procedure Pre_Analyze_Actuals (N : Node_Id) is
7855 Errs : Int := Errors_Detected;
7858 Assoc := First (Generic_Associations (N));
7860 while Present (Assoc) loop
7861 Act := Explicit_Generic_Actual_Parameter (Assoc);
7863 -- Within a nested instantiation, a defaulted actual is an
7864 -- empty association, so nothing to analyze. If the actual for
7865 -- a subprogram is an attribute, analyze prefix only, because
7866 -- actual is not a complete attribute reference.
7867 -- String literals may be operators, but at this point we do not
7868 -- know whether the actual is a formal subprogram or a string.
7873 elsif Nkind (Act) = N_Attribute_Reference then
7874 Analyze (Prefix (Act));
7876 elsif Nkind (Act) = N_Explicit_Dereference then
7877 Analyze (Prefix (Act));
7879 elsif Nkind (Act) /= N_Operator_Symbol then
7883 if Errs /= Errors_Detected then
7884 Abandon_Instantiation (Act);
7889 end Pre_Analyze_Actuals;
7895 procedure Remove_Parent (In_Body : Boolean := False) is
7896 S : Entity_Id := Current_Scope;
7902 -- After child instantiation is complete, remove from scope stack
7903 -- the extra copy of the current scope, and then remove parent
7909 while Current_Scope /= S loop
7911 End_Package_Scope (Current_Scope);
7913 if In_Open_Scopes (P) then
7914 E := First_Entity (P);
7916 while Present (E) loop
7917 Set_Is_Immediately_Visible (E, True);
7921 elsif not In_Open_Scopes (Scope (P)) then
7922 Set_Is_Immediately_Visible (P, False);
7926 -- Reset visibility of entities in the enclosing scope.
7928 Set_Is_Hidden_Open_Scope (Current_Scope, False);
7929 Hidden := First_Elmt (Hidden_Entities);
7931 while Present (Hidden) loop
7932 Set_Is_Immediately_Visible (Node (Hidden), True);
7937 -- Each body is analyzed separately, and there is no context
7938 -- that needs preserving from one body instance to the next,
7939 -- so remove all parent scopes that have been installed.
7941 while Present (S) loop
7942 End_Package_Scope (S);
7944 exit when S = Standard_Standard;
7954 procedure Restore_Env is
7955 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
7958 Ada_83 := Saved.Ada_83;
7960 if No (Current_Instantiated_Parent.Act_Id) then
7962 -- Restore environment after subprogram inlining
7964 Restore_Private_Views (Empty);
7967 Current_Instantiated_Parent := Saved.Instantiated_Parent;
7968 Exchanged_Views := Saved.Exchanged_Views;
7969 Hidden_Entities := Saved.Hidden_Entities;
7970 Current_Sem_Unit := Saved.Current_Sem_Unit;
7972 Instance_Envs.Decrement_Last;
7975 ---------------------------
7976 -- Restore_Private_Views --
7977 ---------------------------
7979 procedure Restore_Private_Views
7980 (Pack_Id : Entity_Id;
7981 Is_Package : Boolean := True)
7990 M := First_Elmt (Exchanged_Views);
7991 while Present (M) loop
7994 -- Subtypes of types whose views have been exchanged, and that
7995 -- are defined within the instance, were not on the list of
7996 -- Private_Dependents on entry to the instance, so they have to
7997 -- be exchanged explicitly now, in order to remain consistent with
7998 -- the view of the parent type.
8000 if Ekind (Typ) = E_Private_Type
8001 or else Ekind (Typ) = E_Limited_Private_Type
8002 or else Ekind (Typ) = E_Record_Type_With_Private
8004 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
8006 while Present (Dep_Elmt) loop
8007 Dep_Typ := Node (Dep_Elmt);
8009 if Scope (Dep_Typ) = Pack_Id
8010 and then Present (Full_View (Dep_Typ))
8012 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
8013 Exchange_Declarations (Dep_Typ);
8016 Next_Elmt (Dep_Elmt);
8020 Exchange_Declarations (Node (M));
8024 if No (Pack_Id) then
8028 -- Make the generic formal parameters private, and make the formal
8029 -- types into subtypes of the actuals again.
8031 E := First_Entity (Pack_Id);
8033 while Present (E) loop
8034 Set_Is_Hidden (E, True);
8037 and then Nkind (Parent (E)) = N_Subtype_Declaration
8039 Set_Is_Generic_Actual_Type (E, False);
8041 -- An unusual case of aliasing: the actual may also be directly
8042 -- visible in the generic, and be private there, while it is
8043 -- fully visible in the context of the instance. The internal
8044 -- subtype is private in the instance, but has full visibility
8045 -- like its parent in the enclosing scope. This enforces the
8046 -- invariant that the privacy status of all private dependents of
8047 -- a type coincide with that of the parent type. This can only
8048 -- happen when a generic child unit is instantiated within a
8051 if Is_Private_Type (E)
8052 and then not Is_Private_Type (Etype (E))
8054 Exchange_Declarations (E);
8057 elsif Ekind (E) = E_Package then
8059 -- The end of the renaming list is the renaming of the generic
8060 -- package itself. If the instance is a subprogram, all entities
8061 -- in the corresponding package are renamings. If this entity is
8062 -- a formal package, make its own formals private as well. The
8063 -- actual in this case is itself the renaming of an instantation.
8064 -- If the entity is not a package renaming, it is the entity
8065 -- created to validate formal package actuals: ignore.
8067 -- If the actual is itself a formal package for the enclosing
8068 -- generic, or the actual for such a formal package, it remains
8069 -- visible after the current instance, and therefore nothing
8070 -- needs to be done either, except to keep it accessible.
8073 and then Renamed_Object (E) = Pack_Id
8077 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8080 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8081 Set_Is_Hidden (E, False);
8085 Act_P : Entity_Id := Renamed_Object (E);
8086 Id : Entity_Id := First_Entity (Act_P);
8090 and then Id /= First_Private_Entity (Act_P)
8092 Set_Is_Hidden (Id, True);
8093 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8094 exit when Ekind (Id) = E_Package
8095 and then Renamed_Object (Id) = Act_P;
8106 end Restore_Private_Views;
8113 (Gen_Unit : Entity_Id;
8114 Act_Unit : Entity_Id)
8116 Saved : Instance_Env;
8119 Saved.Ada_83 := Ada_83;
8120 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8121 Saved.Exchanged_Views := Exchanged_Views;
8122 Saved.Hidden_Entities := Hidden_Entities;
8123 Saved.Current_Sem_Unit := Current_Sem_Unit;
8124 Instance_Envs.Increment_Last;
8125 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8127 -- Regardless of the current mode, predefined units are analyzed in
8128 -- Ada95 mode, and Ada83 checks don't apply.
8130 if Is_Internal_File_Name
8131 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8132 Renamings_Included => True) then
8136 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8137 Exchanged_Views := New_Elmt_List;
8138 Hidden_Entities := New_Elmt_List;
8141 ----------------------------
8142 -- Save_Global_References --
8143 ----------------------------
8145 procedure Save_Global_References (N : Node_Id) is
8146 Gen_Scope : Entity_Id;
8150 function Is_Global (E : Entity_Id) return Boolean;
8151 -- Check whether entity is defined outside of generic unit.
8152 -- Examine the scope of an entity, and the scope of the scope,
8153 -- etc, until we find either Standard, in which case the entity
8154 -- is global, or the generic unit itself, which indicates that
8155 -- the entity is local. If the entity is the generic unit itself,
8156 -- as in the case of a recursive call, or the enclosing generic unit,
8157 -- if different from the current scope, then it is local as well,
8158 -- because it will be replaced at the point of instantiation. On
8159 -- the other hand, if it is a reference to a child unit of a common
8160 -- ancestor, which appears in an instantiation, it is global because
8161 -- it is used to denote a specific compilation unit at the time the
8162 -- instantiations will be analyzed.
8164 procedure Reset_Entity (N : Node_Id);
8165 -- Save semantic information on global entity, so that it is not
8166 -- resolved again at instantiation time.
8168 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8169 -- Default actuals in nested instances must be handled specially
8170 -- because there is no link to them from the original tree. When an
8171 -- actual subprogram is given by a default, we add an explicit generic
8172 -- association for it in the instantiation node. When we save the
8173 -- global references on the name of the instance, we recover the list
8174 -- of generic associations, and add an explicit one to the original
8175 -- generic tree, through which a global actual can be preserved.
8176 -- Similarly, if a child unit is instantiated within a sibling, in the
8177 -- context of the parent, we must preserve the identifier of the parent
8178 -- so that it can be properly resolved in a subsequent instantiation.
8180 procedure Save_Global_Descendant (D : Union_Id);
8181 -- Apply Save_Global_References recursively to the descendents of
8184 procedure Save_References (N : Node_Id);
8185 -- This is the recursive procedure that does the work, once the
8186 -- enclosing generic scope has been established.
8192 function Is_Global (E : Entity_Id) return Boolean is
8193 Se : Entity_Id := Scope (E);
8195 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8196 -- Determine whether the parent node of a reference to a child unit
8197 -- denotes an instantiation or a formal package, in which case the
8198 -- reference to the child unit is global, even if it appears within
8199 -- the current scope (e.g. when the instance appears within the body
8202 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8204 return (Nkind (Decl) in N_Generic_Instantiation
8206 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8207 end Is_Instance_Node;
8209 -- Start of processing for Is_Global
8212 if E = Gen_Scope then
8215 elsif E = Standard_Standard then
8218 elsif Is_Child_Unit (E)
8219 and then (Is_Instance_Node (Parent (N2))
8220 or else (Nkind (Parent (N2)) = N_Expanded_Name
8221 and then N2 = Selector_Name (Parent (N2))
8222 and then Is_Instance_Node (Parent (Parent (N2)))))
8227 while Se /= Gen_Scope loop
8228 if Se = Standard_Standard then
8243 procedure Reset_Entity (N : Node_Id) is
8245 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8246 -- The type of N2 is global to the generic unit. Save the
8247 -- type in the generic node.
8249 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8250 Typ : constant Entity_Id := Etype (N2);
8256 and then Has_Private_View (Entity (N))
8258 -- If the entity of N is not the associated node, this is
8259 -- a nested generic and it has an associated node as well,
8260 -- whose type is already the full view (see below). Indicate
8261 -- that the original node has a private view.
8263 Set_Has_Private_View (N);
8266 -- If not a private type, nothing else to do
8268 if not Is_Private_Type (Typ) then
8269 if Is_Array_Type (Typ)
8270 and then Is_Private_Type (Component_Type (Typ))
8272 Set_Has_Private_View (N);
8275 -- If it is a derivation of a private type in a context where
8276 -- no full view is needed, nothing to do either.
8278 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8281 -- Otherwise mark the type for flipping and use the full_view
8285 Set_Has_Private_View (N);
8287 if Present (Full_View (Typ)) then
8288 Set_Etype (N2, Full_View (Typ));
8291 end Set_Global_Type;
8293 -- Start of processing for Reset_Entity
8296 N2 := Associated_Node (N);
8300 if Is_Global (E) then
8301 Set_Global_Type (N, N2);
8303 elsif Nkind (N) = N_Op_Concat
8304 and then Is_Generic_Type (Etype (N2))
8306 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8307 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8308 and then Is_Intrinsic_Subprogram (E)
8313 -- Entity is local. Mark generic node as unresolved.
8314 -- Note that now it does not have an entity.
8316 Set_Associated_Node (N, Empty);
8317 Set_Etype (N, Empty);
8320 if (Nkind (Parent (N)) = N_Package_Instantiation
8321 or else Nkind (Parent (N)) = N_Function_Instantiation
8322 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8323 and then N = Name (Parent (N))
8325 Save_Global_Defaults (Parent (N), Parent (N2));
8328 elsif Nkind (Parent (N)) = N_Selected_Component
8329 and then Nkind (Parent (N2)) = N_Expanded_Name
8332 if Is_Global (Entity (Parent (N2))) then
8333 Change_Selected_Component_To_Expanded_Name (Parent (N));
8334 Set_Associated_Node (Parent (N), Parent (N2));
8335 Set_Global_Type (Parent (N), Parent (N2));
8337 Save_Global_Descendant (Field2 (N));
8338 Save_Global_Descendant (Field3 (N));
8340 -- If this is a reference to the current generic entity,
8341 -- replace it with a simple name. This is to avoid anomalies
8342 -- when the enclosing scope is also a generic unit, in which
8343 -- case the selected component will not resolve to the current
8344 -- unit within an instance of the outer one. Ditto if the
8345 -- entity is an enclosing scope, e.g. a parent unit.
8347 elsif In_Open_Scopes (Entity (Parent (N2)))
8348 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8350 Rewrite (Parent (N),
8351 Make_Identifier (Sloc (N),
8352 Chars => Chars (Selector_Name (Parent (N2)))));
8355 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8356 or else Nkind (Parent (Parent (N)))
8357 = N_Function_Instantiation
8358 or else Nkind (Parent (Parent (N)))
8359 = N_Procedure_Instantiation)
8360 and then Parent (N) = Name (Parent (Parent (N)))
8362 Save_Global_Defaults
8363 (Parent (Parent (N)), Parent (Parent ((N2))));
8366 -- A selected component may denote a static constant that has
8367 -- been folded. Make the same replacement in original tree.
8369 elsif Nkind (Parent (N)) = N_Selected_Component
8370 and then (Nkind (Parent (N2)) = N_Integer_Literal
8371 or else Nkind (Parent (N2)) = N_Real_Literal)
8373 Rewrite (Parent (N),
8374 New_Copy (Parent (N2)));
8375 Set_Analyzed (Parent (N), False);
8377 -- a selected component may be transformed into a parameterless
8378 -- function call. If the called entity is global, rewrite the
8379 -- node appropriately, i.e. as an extended name for the global
8382 elsif Nkind (Parent (N)) = N_Selected_Component
8383 and then Nkind (Parent (N2)) = N_Function_Call
8384 and then Is_Global (Entity (Name (Parent (N2))))
8386 Change_Selected_Component_To_Expanded_Name (Parent (N));
8387 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8388 Set_Global_Type (Parent (N), Name (Parent (N2)));
8390 Save_Global_Descendant (Field2 (N));
8391 Save_Global_Descendant (Field3 (N));
8394 -- Entity is local. Reset in generic unit, so that node
8395 -- is resolved anew at the point of instantiation.
8397 Set_Associated_Node (N, Empty);
8398 Set_Etype (N, Empty);
8402 --------------------------
8403 -- Save_Global_Defaults --
8404 --------------------------
8406 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8407 Loc : constant Source_Ptr := Sloc (N1);
8408 Assoc1 : List_Id := Generic_Associations (N1);
8409 Assoc2 : List_Id := Generic_Associations (N2);
8413 Gen_Id : Entity_Id := Entity (Name (N2));
8419 if Present (Assoc1) then
8420 Act1 := First (Assoc1);
8423 Set_Generic_Associations (N1, New_List);
8424 Assoc1 := Generic_Associations (N1);
8427 if Present (Assoc2) then
8428 Act2 := First (Assoc2);
8433 while Present (Act1) and then Present (Act2) loop
8438 -- Find the associations added for default suprograms.
8440 if Present (Act2) then
8441 while Nkind (Act2) /= N_Generic_Association
8442 or else No (Entity (Selector_Name (Act2)))
8443 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8448 -- Add a similar association if the default is global. The
8449 -- renaming declaration for the actual has been analyzed, and
8450 -- its alias is the program it renames. Link the actual in the
8451 -- original generic tree with the node in the analyzed tree.
8453 while Present (Act2) loop
8454 Subp := Entity (Selector_Name (Act2));
8455 Def := Explicit_Generic_Actual_Parameter (Act2);
8457 -- Following test is defence against rubbish errors
8459 if No (Alias (Subp)) then
8463 -- Retrieve the resolved actual from the renaming declaration
8464 -- created for the instantiated formal.
8466 Actual := Entity (Name (Parent (Parent (Subp))));
8467 Set_Entity (Def, Actual);
8468 Set_Etype (Def, Etype (Actual));
8470 if Is_Global (Actual) then
8472 Make_Generic_Association (Loc,
8473 Selector_Name => New_Occurrence_Of (Subp, Loc),
8474 Explicit_Generic_Actual_Parameter =>
8475 New_Occurrence_Of (Actual, Loc));
8478 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8480 Append (Ndec, Assoc1);
8482 -- If there are other defaults, add a dummy association
8483 -- in case there are other defaulted formals with the same
8486 elsif Present (Next (Act2)) then
8488 Make_Generic_Association (Loc,
8489 Selector_Name => New_Occurrence_Of (Subp, Loc),
8490 Explicit_Generic_Actual_Parameter => Empty);
8492 Append (Ndec, Assoc1);
8499 if Nkind (Name (N1)) = N_Identifier
8500 and then Is_Child_Unit (Gen_Id)
8501 and then Is_Global (Gen_Id)
8502 and then Is_Generic_Unit (Scope (Gen_Id))
8503 and then In_Open_Scopes (Scope (Gen_Id))
8505 -- This is an instantiation of a child unit within a sibling,
8506 -- so that the generic parent is in scope. An eventual instance
8507 -- must occur within the scope of an instance of the parent.
8508 -- Make name in instance into an expanded name, to preserve the
8509 -- identifier of the parent, so it can be resolved subsequently.
8512 Make_Expanded_Name (Loc,
8513 Chars => Chars (Gen_Id),
8514 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8515 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8516 Set_Entity (Name (N2), Gen_Id);
8519 Make_Expanded_Name (Loc,
8520 Chars => Chars (Gen_Id),
8521 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8522 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8524 Set_Associated_Node (Name (N1), Name (N2));
8525 Set_Associated_Node (Prefix (Name (N1)), Empty);
8527 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8528 Set_Etype (Name (N1), Etype (Gen_Id));
8531 end Save_Global_Defaults;
8533 ----------------------------
8534 -- Save_Global_Descendant --
8535 ----------------------------
8537 procedure Save_Global_Descendant (D : Union_Id) is
8541 if D in Node_Range then
8542 if D = Union_Id (Empty) then
8545 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8546 Save_References (Node_Id (D));
8549 elsif D in List_Range then
8550 if D = Union_Id (No_List)
8551 or else Is_Empty_List (List_Id (D))
8556 N1 := First (List_Id (D));
8557 while Present (N1) loop
8558 Save_References (N1);
8563 -- Element list or other non-node field, nothing to do
8568 end Save_Global_Descendant;
8570 ---------------------
8571 -- Save_References --
8572 ---------------------
8574 -- This is the recursive procedure that does the work, once the
8575 -- enclosing generic scope has been established. We have to treat
8576 -- specially a number of node rewritings that are required by semantic
8577 -- processing and which change the kind of nodes in the generic copy:
8578 -- typically constant-folding, replacing an operator node by a string
8579 -- literal, or a selected component by an expanded name. In each of
8580 -- those cases, the transformation is propagated to the generic unit.
8582 procedure Save_References (N : Node_Id) is
8587 elsif (Nkind (N) = N_Character_Literal
8588 or else Nkind (N) = N_Operator_Symbol)
8590 if Nkind (N) = Nkind (Associated_Node (N)) then
8593 elsif Nkind (N) = N_Operator_Symbol
8594 and then Nkind (Associated_Node (N)) = N_String_Literal
8596 Change_Operator_Symbol_To_String_Literal (N);
8599 elsif Nkind (N) in N_Op then
8601 if Nkind (N) = Nkind (Associated_Node (N)) then
8603 if Nkind (N) = N_Op_Concat then
8604 Set_Is_Component_Left_Opnd (N,
8605 Is_Component_Left_Opnd (Associated_Node (N)));
8607 Set_Is_Component_Right_Opnd (N,
8608 Is_Component_Right_Opnd (Associated_Node (N)));
8613 -- Node may be transformed into call to a user-defined operator
8615 N2 := Associated_Node (N);
8617 if Nkind (N2) = N_Function_Call then
8618 E := Entity (Name (N2));
8621 and then Is_Global (E)
8623 Set_Etype (N, Etype (N2));
8625 Set_Associated_Node (N, Empty);
8626 Set_Etype (N, Empty);
8629 elsif Nkind (N2) = N_Integer_Literal
8630 or else Nkind (N2) = N_Real_Literal
8631 or else Nkind (N2) = N_String_Literal
8632 or else (Nkind (N2) = N_Identifier
8634 Ekind (Entity (N2)) = E_Enumeration_Literal)
8636 -- Operation was constant-folded, perform the same
8637 -- replacement in generic.
8639 -- Note: we do a Replace here rather than a Rewrite,
8640 -- which is a definite violation of the standard rules
8641 -- with regard to retrievability of the original tree,
8642 -- and likely ASIS bugs or at least irregularities are
8643 -- caused by this choice.
8645 -- The reason we do this is that the appropriate original
8646 -- nodes are never constructed (we don't go applying the
8647 -- generic instantiation to rewritten nodes in general).
8648 -- We could try to create an appropriate copy but it would
8649 -- be hard work and does not seem worth while, because
8650 -- the original expression is accessible in the generic,
8651 -- and ASIS rules for traversing instances are fuzzy.
8653 Replace (N, New_Copy (N2));
8654 Set_Analyzed (N, False);
8658 -- Complete the check on operands.
8660 Save_Global_Descendant (Field2 (N));
8661 Save_Global_Descendant (Field3 (N));
8663 elsif Nkind (N) = N_Identifier then
8664 if Nkind (N) = Nkind (Associated_Node (N)) then
8666 -- If this is a discriminant reference, always save it.
8667 -- It is used in the instance to find the corresponding
8668 -- discriminant positionally rather than by name.
8670 Set_Original_Discriminant
8671 (N, Original_Discriminant (Associated_Node (N)));
8675 N2 := Associated_Node (N);
8677 if Nkind (N2) = N_Function_Call then
8678 E := Entity (Name (N2));
8680 -- Name resolves to a call to parameterless function.
8681 -- If original entity is global, mark node as resolved.
8684 and then Is_Global (E)
8686 Set_Etype (N, Etype (N2));
8688 Set_Associated_Node (N, Empty);
8689 Set_Etype (N, Empty);
8693 Nkind (N2) = N_Integer_Literal or else
8694 Nkind (N2) = N_Real_Literal or else
8695 Nkind (N2) = N_String_Literal
8697 -- Name resolves to named number that is constant-folded,
8698 -- or to string literal from concatenation.
8699 -- Perform the same replacement in generic.
8701 Rewrite (N, New_Copy (N2));
8702 Set_Analyzed (N, False);
8704 elsif Nkind (N2) = N_Explicit_Dereference then
8706 -- An identifier is rewritten as a dereference if it is
8707 -- the prefix in a selected component, and it denotes an
8708 -- access to a composite type, or a parameterless function
8709 -- call that returns an access type.
8711 -- Check whether corresponding entity in prefix is global.
8713 if Is_Entity_Name (Prefix (N2))
8714 and then Present (Entity (Prefix (N2)))
8715 and then Is_Global (Entity (Prefix (N2)))
8718 Make_Explicit_Dereference (Sloc (N),
8719 Prefix => Make_Identifier (Sloc (N),
8720 Chars => Chars (N))));
8721 Set_Associated_Node (Prefix (N), Prefix (N2));
8723 elsif Nkind (Prefix (N2)) = N_Function_Call
8724 and then Is_Global (Entity (Name (Prefix (N2))))
8727 Make_Explicit_Dereference (Sloc (N),
8728 Prefix => Make_Function_Call (Sloc (N),
8730 Make_Identifier (Sloc (N),
8731 Chars => Chars (N)))));
8734 (Name (Prefix (N)), Name (Prefix (N2)));
8737 Set_Associated_Node (N, Empty);
8738 Set_Etype (N, Empty);
8741 -- The subtype mark of a nominally unconstrained object
8742 -- is rewritten as a subtype indication using the bounds
8743 -- of the expression. Recover the original subtype mark.
8745 elsif Nkind (N2) = N_Subtype_Indication
8746 and then Is_Entity_Name (Original_Node (N2))
8748 Set_Associated_Node (N, Original_Node (N2));
8756 elsif Nkind (N) in N_Entity then
8759 elsif Nkind (N) = N_Aggregate
8760 or else Nkind (N) = N_Extension_Aggregate
8762 N2 := Associated_Node (N);
8764 or else No (Etype (N2))
8765 or else not Is_Global (Etype (N2))
8767 Set_Associated_Node (N, Empty);
8770 Save_Global_Descendant (Field1 (N));
8771 Save_Global_Descendant (Field2 (N));
8772 Save_Global_Descendant (Field3 (N));
8773 Save_Global_Descendant (Field5 (N));
8776 Save_Global_Descendant (Field1 (N));
8777 Save_Global_Descendant (Field2 (N));
8778 Save_Global_Descendant (Field3 (N));
8779 Save_Global_Descendant (Field4 (N));
8780 Save_Global_Descendant (Field5 (N));
8783 end Save_References;
8785 -- Start of processing for Save_Global_References
8788 Gen_Scope := Current_Scope;
8790 -- If the generic unit is a child unit, references to entities in
8791 -- the parent are treated as local, because they will be resolved
8792 -- anew in the context of the instance of the parent.
8794 while Is_Child_Unit (Gen_Scope)
8795 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8797 Gen_Scope := Scope (Gen_Scope);
8800 Save_References (N);
8801 end Save_Global_References;
8803 -------------------------
8804 -- Set_Associated_Node --
8805 -------------------------
8807 -- Note from RBKD: the uncommented use of Set_Node4 below is ugly ???
8809 procedure Set_Associated_Node
8810 (Gen_Node : Node_Id;
8811 Copy_Node : Node_Id)
8814 Set_Node4 (Gen_Node, Copy_Node);
8815 end Set_Associated_Node;
8817 ---------------------
8818 -- Set_Copied_Sloc --
8819 ---------------------
8821 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8823 Create_Instantiation_Source (N, E, S_Adjustment);
8824 end Set_Copied_Sloc;
8826 ---------------------
8827 -- Set_Instance_Of --
8828 ---------------------
8830 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8832 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8833 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8834 Generic_Renamings.Increment_Last;
8835 end Set_Instance_Of;
8837 --------------------
8838 -- Set_Next_Assoc --
8839 --------------------
8841 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8843 Generic_Renamings.Table (E).Next_In_HTable := Next;
8850 procedure Start_Generic is
8852 -- ??? I am sure more things could be factored out in this
8853 -- routine. Should probably be done at a later stage.
8855 Generic_Flags.Increment_Last;
8856 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
8857 Inside_A_Generic := True;
8859 Expander_Mode_Save_And_Set (False);
8866 procedure Switch_View (T : Entity_Id) is
8867 Priv_Elmt : Elmt_Id := No_Elmt;
8868 Priv_Sub : Entity_Id;
8869 BT : Entity_Id := Base_Type (T);
8872 -- T may be private but its base type may have been exchanged through
8873 -- some other occurrence, in which case there is nothing to switch.
8875 if not Is_Private_Type (BT) then
8879 Priv_Elmt := First_Elmt (Private_Dependents (BT));
8881 if Present (Full_View (BT)) then
8882 Append_Elmt (Full_View (BT), Exchanged_Views);
8883 Exchange_Declarations (BT);
8886 while Present (Priv_Elmt) loop
8887 Priv_Sub := (Node (Priv_Elmt));
8889 -- We avoid flipping the subtype if the Etype of its full
8890 -- view is private because this would result in a malformed
8891 -- subtype. This occurs when the Etype of the subtype full
8892 -- view is the full view of the base type (and since the
8893 -- base types were just switched, the subtype is pointing
8894 -- to the wrong view). This is currently the case for
8895 -- tagged record types, access types (maybe more?) and
8896 -- needs to be resolved. ???
8898 if Present (Full_View (Priv_Sub))
8899 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
8901 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
8902 Exchange_Declarations (Priv_Sub);
8905 Next_Elmt (Priv_Elmt);
8909 -----------------------------
8910 -- Valid_Default_Attribute --
8911 -----------------------------
8913 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
8914 Attr_Id : constant Attribute_Id :=
8915 Get_Attribute_Id (Attribute_Name (Def));
8918 T : Entity_Id := Entity (Prefix (Def));
8920 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
8930 F := First_Formal (Nam);
8931 while Present (F) loop
8937 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
8938 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
8939 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
8940 Attribute_Unbiased_Rounding =>
8941 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
8943 when Attribute_Image | Attribute_Pred | Attribute_Succ |
8944 Attribute_Value | Attribute_Wide_Image |
8945 Attribute_Wide_Value =>
8946 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
8948 when Attribute_Max | Attribute_Min =>
8949 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
8951 when Attribute_Input =>
8952 OK := (Is_Fun and then Num_F = 1);
8954 when Attribute_Output | Attribute_Read | Attribute_Write =>
8955 OK := (not Is_Fun and then Num_F = 2);
8957 when others => OK := False;
8961 Error_Msg_N ("attribute reference has wrong profile for subprogram",
8964 end Valid_Default_Attribute;