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 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4201 -- Make copy of element list.
4203 function Copy_Generic_List
4205 Parent_Id : Node_Id)
4207 -- Apply Copy_Node recursively to the members of a node list.
4209 -----------------------------
4210 -- Copy_Generic_Descendant --
4211 -----------------------------
4213 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4215 if D = Union_Id (Empty) then
4218 elsif D in Node_Range then
4220 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4222 elsif D in List_Range then
4223 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4225 elsif D in Elist_Range then
4226 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4228 -- Nothing else is copyable (e.g. Uint values), return as is
4233 end Copy_Generic_Descendant;
4235 ------------------------
4236 -- Copy_Generic_Elist --
4237 ------------------------
4239 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4246 M := First_Elmt (E);
4247 while Present (M) loop
4249 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4258 end Copy_Generic_Elist;
4260 -----------------------
4261 -- Copy_Generic_List --
4262 -----------------------
4264 function Copy_Generic_List
4266 Parent_Id : Node_Id)
4275 Set_Parent (New_L, Parent_Id);
4278 while Present (N) loop
4279 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4288 end Copy_Generic_List;
4290 -- Start of processing for Copy_Generic_Node
4297 New_N := New_Copy (N);
4299 if Instantiating then
4300 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4303 if not Is_List_Member (N) then
4304 Set_Parent (New_N, Parent_Id);
4307 -- If defining identifier, then all fields have been copied already
4309 if Nkind (New_N) in N_Entity then
4312 -- Special casing for identifiers and other entity names and operators
4314 elsif (Nkind (New_N) = N_Identifier
4315 or else Nkind (New_N) = N_Character_Literal
4316 or else Nkind (New_N) = N_Expanded_Name
4317 or else Nkind (New_N) = N_Operator_Symbol
4318 or else Nkind (New_N) in N_Op)
4320 if not Instantiating then
4322 -- Link both nodes in order to assign subsequently the
4323 -- entity of the copy to the original node, in case this
4324 -- is a global reference.
4326 Set_Associated_Node (N, New_N);
4328 -- If we are within an instantiation, this is a nested generic
4329 -- that has already been analyzed at the point of definition. We
4330 -- must preserve references that were global to the enclosing
4331 -- parent at that point. Other occurrences, whether global or
4332 -- local to the current generic, must be resolved anew, so we
4333 -- reset the entity in the generic copy. A global reference has
4334 -- a smaller depth than the parent, or else the same depth in
4335 -- case both are distinct compilation units.
4337 -- It is also possible for Current_Instantiated_Parent to be
4338 -- defined, and for this not to be a nested generic, namely
4339 -- if the unit is loaded through Rtsfind. In that case, the
4340 -- entity of New_N is only a link to the associated node, and
4341 -- not a defining occurrence.
4343 -- The entities for parent units in the defining_program_unit
4344 -- of a generic child unit are established when the context of
4345 -- the unit is first analyzed, before the generic copy is made.
4346 -- They are preserved in the copy for use in ASIS queries.
4348 Ent := Entity (New_N);
4350 if No (Current_Instantiated_Parent.Gen_Id) then
4352 or else Nkind (Ent) /= N_Defining_Identifier
4353 or else Nkind (Parent (N)) /= N_Defining_Program_Unit_Name
4355 Set_Associated_Node (New_N, Empty);
4360 not (Nkind (Ent) = N_Defining_Identifier
4362 Nkind (Ent) = N_Defining_Character_Literal
4364 Nkind (Ent) = N_Defining_Operator_Symbol)
4365 or else No (Scope (Ent))
4366 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4367 or else (Scope_Depth (Scope (Ent)) >
4368 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4370 Get_Source_Unit (Ent) =
4371 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4373 Set_Associated_Node (New_N, Empty);
4376 -- Case of instantiating identifier or some other name or operator
4379 -- If the associated node is still defined, the entity in
4380 -- it is global, and must be copied to the instance.
4382 if Present (Associated_Node (N)) then
4383 if Nkind (Associated_Node (N)) = Nkind (N) then
4384 Set_Entity (New_N, Entity (Associated_Node (N)));
4385 Check_Private_View (N);
4387 elsif Nkind (Associated_Node (N)) = N_Function_Call then
4388 Set_Entity (New_N, Entity (Name (Associated_Node (N))));
4391 Set_Entity (New_N, Empty);
4396 -- For expanded name, we must copy the Prefix and Selector_Name
4398 if Nkind (N) = N_Expanded_Name then
4401 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4403 Set_Selector_Name (New_N,
4404 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4406 -- For operators, we must copy the right operand
4408 elsif Nkind (N) in N_Op then
4410 Set_Right_Opnd (New_N,
4411 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4413 -- And for binary operators, the left operand as well
4415 if Nkind (N) in N_Binary_Op then
4416 Set_Left_Opnd (New_N,
4417 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4421 -- Special casing for stubs
4423 elsif Nkind (N) in N_Body_Stub then
4425 -- In any case, we must copy the specification or defining
4426 -- identifier as appropriate.
4428 if Nkind (N) = N_Subprogram_Body_Stub then
4429 Set_Specification (New_N,
4430 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4433 Set_Defining_Identifier (New_N,
4435 (Defining_Identifier (N), New_N, Instantiating));
4438 -- If we are not instantiating, then this is where we load and
4439 -- analyze subunits, i.e. at the point where the stub occurs. A
4440 -- more permissivle system might defer this analysis to the point
4441 -- of instantiation, but this seems to complicated for now.
4443 if not Instantiating then
4445 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4447 Unum : Unit_Number_Type;
4453 (Load_Name => Subunit_Name,
4458 -- If the proper body is not found, a warning message will
4459 -- be emitted when analyzing the stub, or later at the the
4460 -- point of instantiation. Here we just leave the stub as is.
4462 if Unum = No_Unit then
4463 Subunits_Missing := True;
4464 goto Subunit_Not_Found;
4467 Subunit := Cunit (Unum);
4469 -- We must create a generic copy of the subunit, in order
4470 -- to perform semantic analysis on it, and we must replace
4471 -- the stub in the original generic unit with the subunit,
4472 -- in order to preserve non-local references within.
4474 -- Only the proper body needs to be copied. Library_Unit and
4475 -- context clause are simply inherited by the generic copy.
4476 -- Note that the copy (which may be recursive if there are
4477 -- nested subunits) must be done first, before attaching it
4478 -- to the enclosing generic.
4482 (Proper_Body (Unit (Subunit)),
4483 Empty, Instantiating => False);
4485 -- Now place the original proper body in the original
4488 Rewrite (N, Proper_Body (Unit (Subunit)));
4489 Set_Was_Originally_Stub (N);
4491 -- Finally replace the body of the subunit with its copy,
4492 -- and make this new subunit into the library unit of the
4493 -- generic copy, which does not have stubs any longer.
4495 Set_Proper_Body (Unit (Subunit), New_Body);
4496 Set_Library_Unit (New_N, Subunit);
4497 Inherit_Context (Unit (Subunit), N);
4501 -- If we are instantiating, this must be an error case, since
4502 -- otherwise we would have replaced the stub node by the proper
4503 -- body that corresponds. So just ignore it in the copy (i.e.
4504 -- we have copied it, and that is good enough).
4510 <<Subunit_Not_Found>> null;
4512 -- If the node is a compilation unit, it is the subunit of a stub,
4513 -- which has been loaded already (see code below). In this case,
4514 -- the library unit field of N points to the parent unit (which
4515 -- is a compilation unit) and need not (and cannot!) be copied.
4517 -- When the proper body of the stub is analyzed, thie library_unit
4518 -- link is used to establish the proper context (see sem_ch10).
4520 -- The other fields of a compilation unit are copied as usual
4522 elsif Nkind (N) = N_Compilation_Unit then
4524 -- This code can only be executed when not instantiating, because
4525 -- in the copy made for an instantiation, the compilation unit
4526 -- node has disappeared at the point that a stub is replaced by
4529 pragma Assert (not Instantiating);
4531 Set_Context_Items (New_N,
4532 Copy_Generic_List (Context_Items (N), New_N));
4535 Copy_Generic_Node (Unit (N), New_N, False));
4537 Set_First_Inlined_Subprogram (New_N,
4539 (First_Inlined_Subprogram (N), New_N, False));
4541 Set_Aux_Decls_Node (New_N,
4542 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
4544 -- For an assignment node, the assignment is known to be semantically
4545 -- legal if we are instantiating the template. This avoids incorrect
4546 -- diagnostics in generated code.
4548 elsif Nkind (N) = N_Assignment_Statement then
4550 -- Copy name and expression fields in usual manner
4553 Copy_Generic_Node (Name (N), New_N, Instantiating));
4555 Set_Expression (New_N,
4556 Copy_Generic_Node (Expression (N), New_N, Instantiating));
4558 if Instantiating then
4559 Set_Assignment_OK (Name (New_N), True);
4562 elsif Nkind (N) = N_Aggregate
4563 or else Nkind (N) = N_Extension_Aggregate
4566 if not Instantiating then
4567 Set_Associated_Node (N, New_N);
4570 if Present (Associated_Node (N))
4571 and then Nkind (Associated_Node (N)) = Nkind (N)
4573 -- In the generic the aggregate has some composite type.
4574 -- If at the point of instantiation the type has a private
4575 -- view, install the full view (and that of its ancestors,
4579 T : Entity_Id := (Etype (Associated_Node (New_N)));
4584 and then Is_Private_Type (T)
4590 and then Is_Tagged_Type (T)
4591 and then Is_Derived_Type (T)
4593 Rt := Root_Type (T);
4598 if Is_Private_Type (T) then
4609 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4610 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4611 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4612 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4614 -- For a proper body, we must catch the case of a proper body that
4615 -- replaces a stub. This represents the point at which a separate
4616 -- compilation unit, and hence template file, may be referenced, so
4617 -- we must make a new source instantiation entry for the template
4618 -- of the subunit, and ensure that all nodes in the subunit are
4619 -- adjusted using this new source instantiation entry.
4621 elsif Nkind (N) in N_Proper_Body then
4624 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
4627 if Instantiating and then Was_Originally_Stub (N) then
4628 Create_Instantiation_Source
4629 (Instantiation_Node, Defining_Entity (N), S_Adjustment);
4632 -- Now copy the fields of the proper body, using the new
4633 -- adjustment factor if one was needed as per test above.
4635 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4636 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4637 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4638 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4639 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4641 -- Restore the original adjustment factor in case changed
4643 S_Adjustment := Save_Adjustment;
4646 -- Don't copy Ident or Comment pragmas, since the comment belongs
4647 -- to the generic unit, not to the instantiating unit.
4649 elsif Nkind (N) = N_Pragma
4650 and then Instantiating
4653 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
4656 if Prag_Id = Pragma_Ident
4657 or else Prag_Id = Pragma_Comment
4659 New_N := Make_Null_Statement (Sloc (N));
4662 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4663 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4664 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4665 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4666 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4670 -- For the remaining nodes, copy recursively their descendants.
4673 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4674 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4675 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4676 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4677 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4680 and then Nkind (N) = N_Subprogram_Body
4682 Set_Generic_Parent (Specification (New_N), N);
4687 end Copy_Generic_Node;
4689 ----------------------------
4690 -- Denotes_Formal_Package --
4691 ----------------------------
4693 function Denotes_Formal_Package (Pack : Entity_Id) return Boolean is
4694 Par : constant Entity_Id := Current_Instantiated_Parent.Act_Id;
4695 Scop : Entity_Id := Scope (Pack);
4699 if Ekind (Scop) = E_Generic_Package
4700 or else Nkind (Unit_Declaration_Node (Scop))
4701 = N_Generic_Subprogram_Declaration
4705 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
4712 -- Check whether this package is associated with a formal
4713 -- package of the enclosing instantiation. Iterate over the
4714 -- list of renamings.
4716 E := First_Entity (Par);
4717 while Present (E) loop
4719 if Ekind (E) /= E_Package
4720 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
4723 elsif Renamed_Object (E) = Par then
4726 elsif Renamed_Object (E) = Pack then
4735 end Denotes_Formal_Package;
4741 procedure End_Generic is
4743 -- ??? More things could be factored out in this
4744 -- routine. Should probably be done at a later stage.
4746 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
4747 Generic_Flags.Decrement_Last;
4749 Expander_Mode_Restore;
4752 ----------------------
4753 -- Find_Actual_Type --
4754 ----------------------
4756 function Find_Actual_Type
4758 Gen_Scope : Entity_Id)
4764 if not Is_Child_Unit (Gen_Scope) then
4765 return Get_Instance_Of (Typ);
4767 elsif not Is_Generic_Type (Typ)
4768 or else Scope (Typ) = Gen_Scope
4770 return Get_Instance_Of (Typ);
4773 T := Current_Entity (Typ);
4774 while Present (T) loop
4775 if In_Open_Scopes (Scope (T)) then
4784 end Find_Actual_Type;
4786 ----------------------------
4787 -- Freeze_Subprogram_Body --
4788 ----------------------------
4790 procedure Freeze_Subprogram_Body
4791 (Inst_Node : Node_Id;
4793 Pack_Id : Entity_Id)
4796 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
4797 Par : constant Entity_Id := Scope (Gen_Unit);
4802 function Earlier (N1, N2 : Node_Id) return Boolean;
4803 -- Yields True if N1 and N2 appear in the same compilation unit,
4804 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
4805 -- traversal of the tree for the unit.
4807 function Enclosing_Body (N : Node_Id) return Node_Id;
4808 -- Find innermost package body that encloses the given node, and which
4809 -- is not a compilation unit. Freeze nodes for the instance, or for its
4810 -- enclosing body, may be inserted after the enclosing_body of the
4813 function Package_Freeze_Node (B : Node_Id) return Node_Id;
4814 -- Find entity for given package body, and locate or create a freeze
4817 function True_Parent (N : Node_Id) return Node_Id;
4818 -- For a subunit, return parent of corresponding stub.
4824 function Earlier (N1, N2 : Node_Id) return Boolean is
4830 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
4831 -- Find distance from given node to enclosing compilation unit.
4833 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
4836 and then Nkind (P) /= N_Compilation_Unit
4838 P := True_Parent (P);
4844 Find_Depth (P1, D1);
4845 Find_Depth (P2, D2);
4855 P1 := True_Parent (P1);
4860 P2 := True_Parent (P2);
4864 -- At this point P1 and P2 are at the same distance from the root.
4865 -- We examine their parents until we find a common declarative
4866 -- list, at which point we can establish their relative placement
4867 -- by comparing their ultimate slocs. If we reach the root,
4868 -- N1 and N2 do not descend from the same declarative list (e.g.
4869 -- one is nested in the declarative part and the other is in a block
4870 -- in the statement part) and the earlier one is already frozen.
4872 while not Is_List_Member (P1)
4873 or else not Is_List_Member (P2)
4874 or else List_Containing (P1) /= List_Containing (P2)
4876 P1 := True_Parent (P1);
4877 P2 := True_Parent (P2);
4879 if Nkind (Parent (P1)) = N_Subunit then
4880 P1 := Corresponding_Stub (Parent (P1));
4883 if Nkind (Parent (P2)) = N_Subunit then
4884 P2 := Corresponding_Stub (Parent (P2));
4893 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
4896 --------------------
4897 -- Enclosing_Body --
4898 --------------------
4900 function Enclosing_Body (N : Node_Id) return Node_Id is
4901 P : Node_Id := Parent (N);
4905 and then Nkind (Parent (P)) /= N_Compilation_Unit
4907 if Nkind (P) = N_Package_Body then
4909 if Nkind (Parent (P)) = N_Subunit then
4910 return Corresponding_Stub (Parent (P));
4916 P := True_Parent (P);
4922 -------------------------
4923 -- Package_Freeze_Node --
4924 -------------------------
4926 function Package_Freeze_Node (B : Node_Id) return Node_Id is
4930 if Nkind (B) = N_Package_Body then
4931 Id := Corresponding_Spec (B);
4933 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
4934 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
4937 Ensure_Freeze_Node (Id);
4938 return Freeze_Node (Id);
4939 end Package_Freeze_Node;
4945 function True_Parent (N : Node_Id) return Node_Id is
4947 if Nkind (Parent (N)) = N_Subunit then
4948 return Parent (Corresponding_Stub (Parent (N)));
4954 -- Start of processing of Freeze_Subprogram_Body
4957 -- If the instance and the generic body appear within the same
4958 -- unit, and the instance preceeds the generic, the freeze node for
4959 -- the instance must appear after that of the generic. If the generic
4960 -- is nested within another instance I2, then current instance must
4961 -- be frozen after I2. In both cases, the freeze nodes are those of
4962 -- enclosing packages. Otherwise, the freeze node is placed at the end
4963 -- of the current declarative part.
4965 Enc_G := Enclosing_Body (Gen_Body);
4966 Enc_I := Enclosing_Body (Inst_Node);
4967 Ensure_Freeze_Node (Pack_Id);
4968 F_Node := Freeze_Node (Pack_Id);
4970 if Is_Generic_Instance (Par)
4971 and then Present (Freeze_Node (Par))
4973 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
4975 Insert_After (Freeze_Node (Par), F_Node);
4977 -- The body enclosing the instance should be frozen after the body
4978 -- that includes the generic, because the body of the instance may
4979 -- make references to entities therein. If the two are not in the
4980 -- same declarative part, or if the one enclosing the instance is
4981 -- frozen already, freeze the instance at the end of the current
4982 -- declarative part.
4984 elsif Is_Generic_Instance (Par)
4985 and then Present (Freeze_Node (Par))
4986 and then Present (Enc_I)
4988 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
4990 (Nkind (Enc_I) = N_Package_Body
4992 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
4995 -- The enclosing package may contain several instances. Rather
4996 -- than computing the earliest point at which to insert its
4997 -- freeze node, we place it at the end of the declarative part
4998 -- of the parent of the generic.
5000 Insert_After_Last_Decl
5001 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5004 Insert_After_Last_Decl (Inst_Node, F_Node);
5006 elsif Present (Enc_G)
5007 and then Present (Enc_I)
5008 and then Enc_G /= Enc_I
5009 and then Earlier (Inst_Node, Gen_Body)
5011 if Nkind (Enc_G) = N_Package_Body then
5012 E_G_Id := Corresponding_Spec (Enc_G);
5013 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5015 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5018 -- Freeze package that encloses instance, and place node after
5019 -- package that encloses generic. If enclosing package is already
5020 -- frozen we have to assume it is at the proper place. This may
5021 -- be a potential ABE that requires dynamic checking.
5023 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5025 -- Freeze enclosing subunit before instance
5027 Ensure_Freeze_Node (E_G_Id);
5029 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5030 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5033 Insert_After_Last_Decl (Inst_Node, F_Node);
5037 -- If none of the above, insert freeze node at the end of the
5038 -- current declarative part.
5040 Insert_After_Last_Decl (Inst_Node, F_Node);
5042 end Freeze_Subprogram_Body;
5048 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5050 return Generic_Renamings.Table (E).Gen_Id;
5053 ---------------------
5054 -- Get_Instance_Of --
5055 ---------------------
5057 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5058 Res : Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5060 if Res /= Assoc_Null then
5061 return Generic_Renamings.Table (Res).Act_Id;
5063 -- On exit, entity is not instantiated: not a generic parameter,
5064 -- or else parameter of an inner generic unit.
5068 end Get_Instance_Of;
5070 ------------------------------------
5071 -- Get_Package_Instantiation_Node --
5072 ------------------------------------
5074 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5075 Decl : Node_Id := Unit_Declaration_Node (A);
5079 -- If the instantiation is a compilation unit that does not need a
5080 -- body then the instantiation node has been rewritten as a package
5081 -- declaration for the instance, and we return the original node.
5082 -- If it is a compilation unit and the instance node has not been
5083 -- rewritten, then it is still the unit of the compilation.
5084 -- Otherwise the instantiation node appears after the declaration.
5085 -- If the entity is a formal package, the declaration may have been
5086 -- rewritten as a generic declaration (in the case of a formal with a
5087 -- box) or left as a formal package declaration if it has actuals, and
5088 -- is found with a forward search.
5090 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5091 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5092 return Original_Node (Decl);
5094 return Unit (Parent (Decl));
5097 elsif Nkind (Decl) = N_Generic_Package_Declaration
5098 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5100 return Original_Node (Decl);
5103 Inst := Next (Decl);
5104 while Nkind (Inst) /= N_Package_Instantiation
5105 and then Nkind (Inst) /= N_Formal_Package_Declaration
5112 end Get_Package_Instantiation_Node;
5114 ------------------------
5115 -- Has_Been_Exchanged --
5116 ------------------------
5118 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5119 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5122 while Present (Next) loop
5123 if Full_View (Node (Next)) = E then
5131 end Has_Been_Exchanged;
5137 function Hash (F : Entity_Id) return HTable_Range is
5139 return HTable_Range (F mod HTable_Size);
5142 ------------------------
5143 -- Hide_Current_Scope --
5144 ------------------------
5146 procedure Hide_Current_Scope is
5147 C : constant Entity_Id := Current_Scope;
5151 Set_Is_Hidden_Open_Scope (C);
5152 E := First_Entity (C);
5154 while Present (E) loop
5155 if Is_Immediately_Visible (E) then
5156 Set_Is_Immediately_Visible (E, False);
5157 Append_Elmt (E, Hidden_Entities);
5163 -- Make the scope name invisible as well. This is necessary, but
5164 -- might conflict with calls to Rtsfind later on, in case the scope
5165 -- is a predefined one. There is no clean solution to this problem, so
5166 -- for now we depend on the user not redefining Standard itself in one
5167 -- of the parent units.
5169 if Is_Immediately_Visible (C)
5170 and then C /= Standard_Standard
5172 Set_Is_Immediately_Visible (C, False);
5173 Append_Elmt (C, Hidden_Entities);
5176 end Hide_Current_Scope;
5178 ------------------------------
5179 -- In_Same_Declarative_Part --
5180 ------------------------------
5182 function In_Same_Declarative_Part
5187 Decls : Node_Id := Parent (F_Node);
5188 Nod : Node_Id := Parent (Inst);
5191 while Present (Nod) loop
5195 elsif Nkind (Nod) = N_Subprogram_Body
5196 or else Nkind (Nod) = N_Package_Body
5197 or else Nkind (Nod) = N_Task_Body
5198 or else Nkind (Nod) = N_Protected_Body
5199 or else Nkind (Nod) = N_Block_Statement
5203 elsif Nkind (Nod) = N_Subunit then
5204 Nod := Corresponding_Stub (Nod);
5206 elsif Nkind (Nod) = N_Compilation_Unit then
5209 Nod := Parent (Nod);
5214 end In_Same_Declarative_Part;
5216 ---------------------
5217 -- Inherit_Context --
5218 ---------------------
5220 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5221 Current_Context : List_Id;
5222 Current_Unit : Node_Id;
5227 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5229 -- The inherited context is attached to the enclosing compilation
5230 -- unit. This is either the main unit, or the declaration for the
5231 -- main unit (in case the instantation appears within the package
5232 -- declaration and the main unit is its body).
5234 Current_Unit := Parent (Inst);
5235 while Present (Current_Unit)
5236 and then Nkind (Current_Unit) /= N_Compilation_Unit
5238 Current_Unit := Parent (Current_Unit);
5241 Current_Context := Context_Items (Current_Unit);
5243 Item := First (Context_Items (Parent (Gen_Decl)));
5244 while Present (Item) loop
5245 if Nkind (Item) = N_With_Clause then
5246 New_I := New_Copy (Item);
5247 Set_Implicit_With (New_I, True);
5248 Append (New_I, Current_Context);
5254 end Inherit_Context;
5256 ----------------------------
5257 -- Insert_After_Last_Decl --
5258 ----------------------------
5260 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5261 L : List_Id := List_Containing (N);
5262 P : Node_Id := Parent (L);
5265 if not Is_List_Member (F_Node) then
5266 if Nkind (P) = N_Package_Specification
5267 and then L = Visible_Declarations (P)
5268 and then Present (Private_Declarations (P))
5269 and then not Is_Empty_List (Private_Declarations (P))
5271 L := Private_Declarations (P);
5274 Insert_After (Last (L), F_Node);
5276 end Insert_After_Last_Decl;
5282 procedure Install_Body
5283 (Act_Body : Node_Id;
5288 Act_Id : Entity_Id := Corresponding_Spec (Act_Body);
5289 Act_Unit : constant Node_Id :=
5290 Unit (Cunit (Get_Source_Unit (N)));
5292 Gen_Id : Entity_Id := Corresponding_Spec (Gen_Body);
5293 Gen_Unit : constant Node_Id :=
5294 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5295 Orig_Body : Node_Id := Gen_Body;
5296 Par : constant Entity_Id := Scope (Gen_Id);
5297 Body_Unit : Node_Id;
5299 Must_Delay : Boolean;
5301 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5302 -- Find subprogram (if any) that encloses instance and/or generic body.
5304 function True_Sloc (N : Node_Id) return Source_Ptr;
5305 -- If the instance is nested inside a generic unit, the Sloc of the
5306 -- instance indicates the place of the original definition, not the
5307 -- point of the current enclosing instance. Pending a better usage of
5308 -- Slocs to indicate instantiation places, we determine the place of
5309 -- origin of a node by finding the maximum sloc of any ancestor node.
5310 -- Why is this not equivalent fo Top_Level_Location ???
5312 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5313 Scop : Entity_Id := Scope (Id);
5316 while Scop /= Standard_Standard
5317 and then not Is_Overloadable (Scop)
5319 Scop := Scope (Scop);
5325 function True_Sloc (N : Node_Id) return Source_Ptr is
5332 while Present (N1) and then N1 /= Act_Unit loop
5333 if Sloc (N1) > Res then
5343 -- Start of processing for Install_Body
5346 -- If the body is a subunit, the freeze point is the corresponding
5347 -- stub in the current compilation, not the subunit itself.
5349 if Nkind (Parent (Gen_Body)) = N_Subunit then
5350 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5352 Orig_Body := Gen_Body;
5355 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5357 -- If the instantiation and the generic definition appear in the
5358 -- same package declaration, this is an early instantiation.
5359 -- If they appear in the same declarative part, it is an early
5360 -- instantiation only if the generic body appears textually later,
5361 -- and the generic body is also in the main unit.
5363 -- If instance is nested within a subprogram, and the generic body is
5364 -- not, the instance is delayed because the enclosing body is. If
5365 -- instance and body are within the same scope, or the same sub-
5366 -- program body, indicate explicitly that the instance is delayed.
5369 (Gen_Unit = Act_Unit
5370 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
5371 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
5372 or else (Gen_Unit = Body_Unit
5373 and then True_Sloc (N) < Sloc (Orig_Body)))
5374 and then Is_In_Main_Unit (Gen_Unit)
5375 and then (Scope (Act_Id) = Scope (Gen_Id)
5377 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
5379 -- If this is an early instantiation, the freeze node is placed after
5380 -- the generic body. Otherwise, if the generic appears in an instance,
5381 -- we cannot freeze the current instance until the outer one is frozen.
5382 -- This is only relevant if the current instance is nested within some
5383 -- inner scope not itself within the outer instance. If this scope is
5384 -- a package body in the same declarative part as the outer instance,
5385 -- then that body needs to be frozen after the outer instance. Finally,
5386 -- if no delay is needed, we place the freeze node at the end of the
5387 -- current declarative part.
5389 if Expander_Active then
5390 Ensure_Freeze_Node (Act_Id);
5391 F_Node := Freeze_Node (Act_Id);
5394 Insert_After (Orig_Body, F_Node);
5396 elsif Is_Generic_Instance (Par)
5397 and then Present (Freeze_Node (Par))
5398 and then Scope (Act_Id) /= Par
5400 -- Freeze instance of inner generic after instance of enclosing
5403 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
5404 Insert_After (Freeze_Node (Par), F_Node);
5406 -- Freeze package enclosing instance of inner generic after
5407 -- instance of enclosing generic.
5409 elsif Nkind (Parent (N)) = N_Package_Body
5410 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
5414 Enclosing : Entity_Id := Corresponding_Spec (Parent (N));
5417 Insert_After_Last_Decl (N, F_Node);
5418 Ensure_Freeze_Node (Enclosing);
5420 if not Is_List_Member (Freeze_Node (Enclosing)) then
5421 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
5426 Insert_After_Last_Decl (N, F_Node);
5430 Insert_After_Last_Decl (N, F_Node);
5434 Set_Is_Frozen (Act_Id);
5435 Insert_Before (N, Act_Body);
5436 Mark_Rewrite_Insertion (Act_Body);
5439 --------------------
5440 -- Install_Parent --
5441 --------------------
5443 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
5444 S : Entity_Id := Current_Scope;
5445 Inst_Par : Entity_Id;
5446 First_Par : Entity_Id;
5447 Inst_Node : Node_Id;
5448 Gen_Par : Entity_Id;
5449 First_Gen : Entity_Id;
5450 Ancestors : Elist_Id := New_Elmt_List;
5453 procedure Install_Formal_Packages (Par : Entity_Id);
5454 -- If any of the formals of the parent are formal packages with box,
5455 -- their formal parts are visible in the parent and thus in the child
5456 -- unit as well. Analogous to what is done in Check_Generic_Actuals
5457 -- for the unit itself.
5459 procedure Install_Noninstance_Specs (Par : Entity_Id);
5460 -- Install the scopes of noninstance parent units ending with Par.
5462 procedure Install_Spec (Par : Entity_Id);
5463 -- The child unit is within the declarative part of the parent, so
5464 -- the declarations within the parent are immediately visible.
5466 -----------------------------
5467 -- Install_Formal_Packages --
5468 -----------------------------
5470 procedure Install_Formal_Packages (Par : Entity_Id) is
5474 E := First_Entity (Par);
5476 while Present (E) loop
5478 if Ekind (E) = E_Package
5479 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
5481 -- If this is the renaming for the parent instance, done.
5483 if Renamed_Object (E) = Par then
5486 -- The visibility of a formal of an enclosing generic is
5489 elsif Denotes_Formal_Package (E) then
5492 elsif Present (Associated_Formal_Package (E))
5493 and then Box_Present (Parent (Associated_Formal_Package (E)))
5495 Check_Generic_Actuals (Renamed_Object (E), True);
5496 Set_Is_Hidden (E, False);
5502 end Install_Formal_Packages;
5504 -------------------------------
5505 -- Install_Noninstance_Specs --
5506 -------------------------------
5508 procedure Install_Noninstance_Specs (Par : Entity_Id) is
5511 and then Par /= Standard_Standard
5512 and then not In_Open_Scopes (Par)
5514 Install_Noninstance_Specs (Scope (Par));
5517 end Install_Noninstance_Specs;
5523 procedure Install_Spec (Par : Entity_Id) is
5524 Spec : constant Node_Id :=
5525 Specification (Unit_Declaration_Node (Par));
5529 Set_Is_Immediately_Visible (Par);
5530 Install_Visible_Declarations (Par);
5531 Install_Private_Declarations (Par);
5532 Set_Use (Visible_Declarations (Spec));
5533 Set_Use (Private_Declarations (Spec));
5536 -- Start of processing for Install_Parent
5539 -- We need to install the parent instance to compile the instantiation
5540 -- of the child, but the child instance must appear in the current
5541 -- scope. Given that we cannot place the parent above the current
5542 -- scope in the scope stack, we duplicate the current scope and unstack
5543 -- both after the instantiation is complete.
5545 -- If the parent is itself the instantiation of a child unit, we must
5546 -- also stack the instantiation of its parent, and so on. Each such
5547 -- ancestor is the prefix of the name in a prior instantiation.
5549 -- If this is a nested instance, the parent unit itself resolves to
5550 -- a renaming of the parent instance, whose declaration we need.
5552 -- Finally, the parent may be a generic (not an instance) when the
5553 -- child unit appears as a formal package.
5557 if Present (Renamed_Entity (Inst_Par)) then
5558 Inst_Par := Renamed_Entity (Inst_Par);
5561 First_Par := Inst_Par;
5564 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
5566 First_Gen := Gen_Par;
5568 while Present (Gen_Par)
5569 and then Is_Child_Unit (Gen_Par)
5571 -- Load grandparent instance as well.
5573 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
5575 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
5576 Inst_Par := Entity (Prefix (Name (Inst_Node)));
5578 if Present (Renamed_Entity (Inst_Par)) then
5579 Inst_Par := Renamed_Entity (Inst_Par);
5584 (Specification (Unit_Declaration_Node (Inst_Par)));
5586 if Present (Gen_Par) then
5587 Prepend_Elmt (Inst_Par, Ancestors);
5590 -- Parent is not the name of an instantiation.
5592 Install_Noninstance_Specs (Inst_Par);
5604 if Present (First_Gen) then
5605 Append_Elmt (First_Par, Ancestors);
5608 Install_Noninstance_Specs (First_Par);
5611 if not Is_Empty_Elmt_List (Ancestors) then
5612 Elmt := First_Elmt (Ancestors);
5614 while Present (Elmt) loop
5615 Install_Spec (Node (Elmt));
5616 Install_Formal_Packages (Node (Elmt));
5627 --------------------------------
5628 -- Instantiate_Formal_Package --
5629 --------------------------------
5631 function Instantiate_Formal_Package
5634 Analyzed_Formal : Node_Id)
5637 Loc : constant Source_Ptr := Sloc (Actual);
5638 Actual_Pack : Entity_Id;
5639 Formal_Pack : Entity_Id;
5640 Gen_Parent : Entity_Id;
5643 Parent_Spec : Node_Id;
5645 function Formal_Entity
5647 Act_Ent : Entity_Id)
5649 -- Returns the entity associated with the given formal F. In the
5650 -- case where F is a formal package, this function will iterate
5651 -- through all of F's formals and enter map associations from the
5652 -- actuals occurring in the formal package's corresponding actual
5653 -- package (obtained via Act_Ent) to the formal package's formal
5654 -- parameters. This function is called recursively for arbitrary
5655 -- levels of formal packages.
5657 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
5658 -- Within the generic part, entities in the formal package are
5659 -- visible. To validate subsequent type declarations, indicate
5660 -- the correspondence betwen the entities in the analyzed formal,
5661 -- and the entities in the actual package. There are three packages
5662 -- involved in the instantiation of a formal package: the parent
5663 -- generic P1 which appears in the generic declaration, the fake
5664 -- instantiation P2 which appears in the analyzed generic, and whose
5665 -- visible entities may be used in subsequent formals, and the actual
5666 -- P3 in the instance. To validate subsequent formals, me indicate
5667 -- that the entities in P2 are mapped into those of P3. The mapping of
5668 -- entities has to be done recursively for nested packages.
5674 function Formal_Entity
5676 Act_Ent : Entity_Id)
5679 Orig_Node : Node_Id := F;
5683 when N_Formal_Object_Declaration =>
5684 return Defining_Identifier (F);
5686 when N_Formal_Type_Declaration =>
5687 return Defining_Identifier (F);
5689 when N_Formal_Subprogram_Declaration =>
5690 return Defining_Unit_Name (Specification (F));
5692 when N_Formal_Package_Declaration |
5693 N_Generic_Package_Declaration =>
5695 if Nkind (F) = N_Generic_Package_Declaration then
5696 Orig_Node := Original_Node (F);
5700 Actual_Ent : Entity_Id := First_Entity (Act_Ent);
5701 Formal_Node : Node_Id;
5702 Formal_Ent : Entity_Id;
5704 Gen_Decl : Node_Id :=
5705 Unit_Declaration_Node
5706 (Entity (Name (Orig_Node)));
5707 Formals : List_Id :=
5708 Generic_Formal_Declarations (Gen_Decl);
5711 if Present (Formals) then
5712 Formal_Node := First_Non_Pragma (Formals);
5714 Formal_Node := Empty;
5717 -- As for the loop further below, this loop is making
5718 -- a probably invalid assumption about the correspondence
5719 -- between formals and actuals and eventually needs to
5720 -- corrected to account for cases where the formals are
5721 -- not synchronized and in one-to-one correspondence
5722 -- with actuals. ???
5724 -- What is certain is that for a legal program the
5725 -- presence of actual entities guarantees the existing
5728 while Present (Actual_Ent)
5729 and then Present (Formal_Node)
5730 and then Actual_Ent /= First_Private_Entity (Act_Ent)
5732 -- ??? Are the following calls also needed here:
5734 -- Set_Is_Hidden (Actual_Ent, False);
5735 -- Set_Is_Potentially_Use_Visible
5736 -- (Actual_Ent, In_Use (Act_Ent));
5738 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5739 if Present (Formal_Ent) then
5740 Set_Instance_Of (Formal_Ent, Actual_Ent);
5742 Next_Non_Pragma (Formal_Node);
5744 Next_Entity (Actual_Ent);
5748 return Defining_Identifier (Orig_Node);
5750 when N_Use_Package_Clause =>
5753 when N_Use_Type_Clause =>
5756 -- We return Empty for all other encountered forms of
5757 -- declarations because there are some cases of nonformal
5758 -- sorts of declaration that can show up (e.g., when array
5759 -- formals are present). Since it's not clear what kinds
5760 -- can appear among the formals, we won't raise failure here.
5772 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
5777 Set_Instance_Of (Form, Act);
5779 E1 := First_Entity (Form);
5780 E2 := First_Entity (Act);
5782 and then E1 /= First_Private_Entity (Form)
5784 if not Is_Internal (E1)
5785 and then not Is_Class_Wide_Type (E1)
5789 and then Chars (E2) /= Chars (E1)
5797 Set_Instance_Of (E1, E2);
5800 and then Is_Tagged_Type (E2)
5803 (Class_Wide_Type (E1), Class_Wide_Type (E2));
5806 if Ekind (E1) = E_Package
5807 and then No (Renamed_Object (E1))
5809 Map_Entities (E1, E2);
5818 -- Start of processing for Instantiate_Formal_Package
5823 if not Is_Entity_Name (Actual)
5824 or else Ekind (Entity (Actual)) /= E_Package
5827 ("expect package instance to instantiate formal", Actual);
5828 Abandon_Instantiation (Actual);
5829 raise Program_Error;
5832 Actual_Pack := Entity (Actual);
5833 Set_Is_Instantiated (Actual_Pack);
5835 -- The actual may be a renamed package, or an outer generic
5836 -- formal package whose instantiation is converted into a renaming.
5838 if Present (Renamed_Object (Actual_Pack)) then
5839 Actual_Pack := Renamed_Object (Actual_Pack);
5842 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
5843 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
5844 Formal_Pack := Defining_Identifier (Analyzed_Formal);
5847 Generic_Parent (Specification (Analyzed_Formal));
5849 Defining_Unit_Name (Specification (Analyzed_Formal));
5852 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
5853 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
5855 Parent_Spec := Parent (Actual_Pack);
5858 if Gen_Parent = Any_Id then
5860 ("previous error in declaration of formal package", Actual);
5861 Abandon_Instantiation (Actual);
5864 Generic_Parent (Parent_Spec) /= Get_Instance_Of (Gen_Parent)
5867 ("actual parameter must be instance of&", Actual, Gen_Parent);
5868 Abandon_Instantiation (Actual);
5871 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
5872 Map_Entities (Formal_Pack, Actual_Pack);
5875 Make_Package_Renaming_Declaration (Loc,
5876 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
5877 Name => New_Reference_To (Actual_Pack, Loc));
5879 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
5880 Defining_Identifier (Formal));
5881 Decls := New_List (Nod);
5883 -- If the formal F has a box, then the generic declarations are
5884 -- visible in the generic G. In an instance of G, the corresponding
5885 -- entities in the actual for F (which are the actuals for the
5886 -- instantiation of the generic that F denotes) must also be made
5887 -- visible for analysis of the current instance. On exit from the
5888 -- current instance, those entities are made private again. If the
5889 -- actual is currently in use, these entities are also use-visible.
5891 -- The loop through the actual entities also steps through the
5892 -- formal entities and enters associations from formals to
5893 -- actuals into the renaming map. This is necessary to properly
5894 -- handle checking of actual parameter associations for later
5895 -- formals that depend on actuals declared in the formal package.
5897 -- This processing needs to be reviewed at some point because
5898 -- it is probably not entirely correct as written. For example
5899 -- there may not be a strict one-to-one correspondence between
5900 -- actuals and formals and this loop is currently assuming that
5903 if Box_Present (Formal) then
5905 Actual_Ent : Entity_Id := First_Entity (Actual_Pack);
5906 Formal_Node : Node_Id := Empty;
5907 Formal_Ent : Entity_Id;
5908 Gen_Decl : Node_Id := Unit_Declaration_Node (Gen_Parent);
5909 Formals : List_Id := Generic_Formal_Declarations (Gen_Decl);
5912 if Present (Formals) then
5913 Formal_Node := First_Non_Pragma (Formals);
5916 while Present (Actual_Ent)
5917 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
5919 Set_Is_Hidden (Actual_Ent, False);
5920 Set_Is_Potentially_Use_Visible
5921 (Actual_Ent, In_Use (Actual_Pack));
5923 if Present (Formal_Node) then
5924 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
5926 if Present (Formal_Ent) then
5927 Set_Instance_Of (Formal_Ent, Actual_Ent);
5930 Next_Non_Pragma (Formal_Node);
5933 Next_Entity (Actual_Ent);
5937 -- If the formal is not declared with a box, reanalyze it as
5938 -- an instantiation, to verify the matching rules of 12.7. The
5939 -- actual checks are performed after the generic associations
5944 I_Pack : constant Entity_Id :=
5945 Make_Defining_Identifier (Sloc (Actual),
5946 Chars => New_Internal_Name ('P'));
5949 Set_Is_Internal (I_Pack);
5952 Make_Package_Instantiation (Sloc (Actual),
5953 Defining_Unit_Name => I_Pack,
5954 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
5955 Generic_Associations =>
5956 Generic_Associations (Formal)));
5963 end Instantiate_Formal_Package;
5965 -----------------------------------
5966 -- Instantiate_Formal_Subprogram --
5967 -----------------------------------
5969 function Instantiate_Formal_Subprogram
5972 Analyzed_Formal : Node_Id)
5975 Loc : Source_Ptr := Sloc (Instantiation_Node);
5976 Formal_Sub : constant Entity_Id :=
5977 Defining_Unit_Name (Specification (Formal));
5978 Analyzed_S : constant Entity_Id :=
5979 Defining_Unit_Name (Specification (Analyzed_Formal));
5980 Decl_Node : Node_Id;
5984 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
5985 -- If the generic is a child unit, the parent has been installed
5986 -- on the scope stack, but a default subprogram cannot resolve to
5987 -- something on the parent because that parent is not really part
5988 -- of the visible context (it is there to resolve explicit local
5989 -- entities). If the default has resolved in this way, we remove
5990 -- the entity from immediate visibility and analyze the node again
5991 -- to emit an error message or find another visible candidate.
5993 procedure Valid_Actual_Subprogram (Act : Node_Id);
5994 -- Perform legality check and raise exception on failure.
5996 -----------------------
5997 -- From_Parent_Scope --
5998 -----------------------
6000 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6001 Gen_Scope : Node_Id := Scope (Analyzed_S);
6004 while Present (Gen_Scope)
6005 and then Is_Child_Unit (Gen_Scope)
6007 if Scope (Subp) = Scope (Gen_Scope) then
6011 Gen_Scope := Scope (Gen_Scope);
6015 end From_Parent_Scope;
6017 -----------------------------
6018 -- Valid_Actual_Subprogram --
6019 -----------------------------
6021 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6023 if not Is_Entity_Name (Act)
6024 and then Nkind (Act) /= N_Operator_Symbol
6025 and then Nkind (Act) /= N_Attribute_Reference
6026 and then Nkind (Act) /= N_Selected_Component
6027 and then Nkind (Act) /= N_Indexed_Component
6028 and then Nkind (Act) /= N_Character_Literal
6029 and then Nkind (Act) /= N_Explicit_Dereference
6031 if Etype (Act) /= Any_Type then
6033 ("Expect subprogram name to instantiate &",
6034 Instantiation_Node, Formal_Sub);
6037 -- In any case, instantiation cannot continue.
6039 Abandon_Instantiation (Instantiation_Node);
6041 end Valid_Actual_Subprogram;
6043 -- Start of processing for Instantiate_Formal_Subprogram
6046 New_Spec := New_Copy_Tree (Specification (Formal));
6048 -- Create new entity for the actual (New_Copy_Tree does not).
6050 Set_Defining_Unit_Name
6051 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6053 -- Find entity of actual. If the actual is an attribute reference, it
6054 -- cannot be resolved here (its formal is missing) but is handled
6055 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6056 -- fully resolved subsequently, when the renaming declaration for the
6057 -- formal is analyzed. If it is an explicit dereference, resolve the
6058 -- prefix but not the actual itself, to prevent interpretation as a
6061 if Present (Actual) then
6062 Loc := Sloc (Actual);
6063 Set_Sloc (New_Spec, Loc);
6065 if Nkind (Actual) = N_Operator_Symbol then
6066 Find_Direct_Name (Actual);
6068 elsif Nkind (Actual) = N_Explicit_Dereference then
6069 Analyze (Prefix (Actual));
6071 elsif Nkind (Actual) /= N_Attribute_Reference then
6075 Valid_Actual_Subprogram (Actual);
6078 elsif Present (Default_Name (Formal)) then
6080 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6081 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6082 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6083 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6084 and then Present (Entity (Default_Name (Formal)))
6086 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6088 Nam := New_Copy (Default_Name (Formal));
6089 Set_Sloc (Nam, Loc);
6092 elsif Box_Present (Formal) then
6094 -- Actual is resolved at the point of instantiation. Create
6095 -- an identifier or operator with the same name as the formal.
6097 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6098 Nam := Make_Operator_Symbol (Loc,
6099 Chars => Chars (Formal_Sub),
6100 Strval => No_String);
6102 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6107 ("missing actual for instantiation of &",
6108 Instantiation_Node, Formal_Sub);
6109 Abandon_Instantiation (Instantiation_Node);
6113 Make_Subprogram_Renaming_Declaration (Loc,
6114 Specification => New_Spec,
6117 -- Gather possible interpretations for the actual before analyzing the
6118 -- instance. If overloaded, it will be resolved when analyzing the
6119 -- renaming declaration.
6121 if Box_Present (Formal)
6122 and then No (Actual)
6126 if Is_Child_Unit (Scope (Analyzed_S))
6127 and then Present (Entity (Nam))
6129 if not Is_Overloaded (Nam) then
6131 if From_Parent_Scope (Entity (Nam)) then
6132 Set_Is_Immediately_Visible (Entity (Nam), False);
6133 Set_Entity (Nam, Empty);
6134 Set_Etype (Nam, Empty);
6138 Set_Is_Immediately_Visible (Entity (Nam));
6147 Get_First_Interp (Nam, I, It);
6149 while Present (It.Nam) loop
6150 if From_Parent_Scope (It.Nam) then
6154 Get_Next_Interp (I, It);
6161 -- The generic instantiation freezes the actual. This can only be
6162 -- done once the actual is resolved, in the analysis of the renaming
6163 -- declaration. To indicate that must be done, we set the corresponding
6164 -- spec of the node to point to the formal subprogram declaration.
6166 Set_Corresponding_Spec (Decl_Node, Analyzed_Formal);
6168 -- We cannot analyze the renaming declaration, and thus find the
6169 -- actual, until the all the actuals are assembled in the instance.
6170 -- For subsequent checks of other actuals, indicate the node that
6171 -- will hold the instance of this formal.
6173 Set_Instance_Of (Analyzed_S, Nam);
6175 if Nkind (Actual) = N_Selected_Component
6176 and then Is_Task_Type (Etype (Prefix (Actual)))
6177 and then not Is_Frozen (Etype (Prefix (Actual)))
6179 -- The renaming declaration will create a body, which must appear
6180 -- outside of the instantiation, We move the renaming declaration
6181 -- out of the instance, and create an additional renaming inside,
6182 -- to prevent freezing anomalies.
6185 Anon_Id : constant Entity_Id :=
6186 Make_Defining_Identifier
6187 (Loc, New_Internal_Name ('E'));
6189 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6190 Insert_Before (Instantiation_Node, Decl_Node);
6191 Analyze (Decl_Node);
6193 -- Now create renaming within the instance.
6196 Make_Subprogram_Renaming_Declaration (Loc,
6197 Specification => New_Copy_Tree (New_Spec),
6198 Name => New_Occurrence_Of (Anon_Id, Loc));
6200 Set_Defining_Unit_Name (Specification (Decl_Node),
6201 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6206 end Instantiate_Formal_Subprogram;
6208 ------------------------
6209 -- Instantiate_Object --
6210 ------------------------
6212 function Instantiate_Object
6215 Analyzed_Formal : Node_Id)
6218 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
6219 Type_Id : constant Node_Id := Subtype_Mark (Formal);
6220 Loc : constant Source_Ptr := Sloc (Actual);
6221 Act_Assoc : constant Node_Id := Parent (Actual);
6222 Orig_Ftyp : constant Entity_Id :=
6223 Etype (Defining_Identifier (Analyzed_Formal));
6225 Decl_Node : Node_Id;
6226 Subt_Decl : Node_Id := Empty;
6227 List : List_Id := New_List;
6230 if Get_Instance_Of (Formal_Id) /= Formal_Id then
6231 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
6234 Set_Parent (List, Parent (Actual));
6238 if Out_Present (Formal) then
6240 -- An IN OUT generic actual must be a name. The instantiation is
6241 -- a renaming declaration. The actual is the name being renamed.
6242 -- We use the actual directly, rather than a copy, because it is not
6243 -- used further in the list of actuals, and because a copy or a use
6244 -- of relocate_node is incorrect if the instance is nested within
6245 -- a generic. In order to simplify ASIS searches, the Generic_Parent
6246 -- field links the declaration to the generic association.
6250 ("missing actual for instantiation of &",
6251 Instantiation_Node, Formal_Id);
6252 Abandon_Instantiation (Instantiation_Node);
6256 Make_Object_Renaming_Declaration (Loc,
6257 Defining_Identifier => New_Copy (Formal_Id),
6258 Subtype_Mark => New_Copy_Tree (Type_Id),
6261 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6263 -- The analysis of the actual may produce insert_action nodes, so
6264 -- the declaration must have a context in which to attach them.
6266 Append (Decl_Node, List);
6269 -- This check is performed here because Analyze_Object_Renaming
6270 -- will not check it when Comes_From_Source is False. Note
6271 -- though that the check for the actual being the name of an
6272 -- object will be performed in Analyze_Object_Renaming.
6274 if Is_Object_Reference (Actual)
6275 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
6278 ("illegal discriminant-dependent component for in out parameter",
6282 -- The actual has to be resolved in order to check that it is
6283 -- a variable (due to cases such as F(1), where F returns
6284 -- access to an array, and for overloaded prefixes).
6287 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
6289 if Is_Private_Type (Ftyp)
6290 and then not Is_Private_Type (Etype (Actual))
6291 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
6292 or else Base_Type (Etype (Actual)) = Ftyp)
6294 -- If the actual has the type of the full view of the formal,
6295 -- or else a non-private subtype of the formal, then
6296 -- the visibility of the formal type has changed. Add to the
6297 -- actuals a subtype declaration that will force the exchange
6298 -- of views in the body of the instance as well.
6301 Make_Subtype_Declaration (Loc,
6302 Defining_Identifier =>
6303 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
6304 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
6306 Prepend (Subt_Decl, List);
6308 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
6309 Exchange_Declarations (Ftyp);
6312 Resolve (Actual, Ftyp);
6314 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
6316 ("actual for& must be a variable", Actual, Formal_Id);
6318 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
6320 "type of actual does not match type of&", Actual, Formal_Id);
6324 Note_Possible_Modification (Actual);
6326 -- Check for instantiation of atomic/volatile actual for
6327 -- non-atomic/volatile formal (RM C.6 (12)).
6329 if Is_Atomic_Object (Actual)
6330 and then not Is_Atomic (Orig_Ftyp)
6333 ("cannot instantiate non-atomic formal object " &
6334 "with atomic actual", Actual);
6336 elsif Is_Volatile_Object (Actual)
6337 and then not Is_Volatile (Orig_Ftyp)
6340 ("cannot instantiate non-volatile formal object " &
6341 "with volatile actual", Actual);
6347 -- The instantiation of a generic formal in-parameter
6348 -- is a constant declaration. The actual is the expression for
6349 -- that declaration.
6351 if Present (Actual) then
6353 Decl_Node := Make_Object_Declaration (Loc,
6354 Defining_Identifier => New_Copy (Formal_Id),
6355 Constant_Present => True,
6356 Object_Definition => New_Copy_Tree (Type_Id),
6357 Expression => Actual);
6359 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
6361 -- A generic formal object of a tagged type is defined
6362 -- to be aliased so the new constant must also be treated
6366 (Etype (Defining_Identifier (Analyzed_Formal)))
6368 Set_Aliased_Present (Decl_Node);
6371 Append (Decl_Node, List);
6377 (Etype (Defining_Identifier (Analyzed_Formal)));
6379 Freeze_Before (Instantiation_Node, Typ);
6381 -- If the actual is an aggregate, perform name resolution
6382 -- on its components (the analysis of an aggregate does not
6383 -- do it) to capture local names that may be hidden if the
6384 -- generic is a child unit.
6386 if Nkind (Actual) = N_Aggregate then
6387 Pre_Analyze_And_Resolve (Actual, Typ);
6391 elsif Present (Expression (Formal)) then
6393 -- Use default to construct declaration.
6396 Make_Object_Declaration (Sloc (Formal),
6397 Defining_Identifier => New_Copy (Formal_Id),
6398 Constant_Present => True,
6399 Object_Definition => New_Copy (Type_Id),
6400 Expression => New_Copy_Tree (Expression (Formal)));
6402 Append (Decl_Node, List);
6403 Set_Analyzed (Expression (Decl_Node), False);
6407 ("missing actual for instantiation of &",
6408 Instantiation_Node, Formal_Id);
6409 Abandon_Instantiation (Instantiation_Node);
6415 end Instantiate_Object;
6417 ------------------------------
6418 -- Instantiate_Package_Body --
6419 ------------------------------
6421 procedure Instantiate_Package_Body
6422 (Body_Info : Pending_Body_Info)
6424 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6425 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6426 Loc : constant Source_Ptr := Sloc (Inst_Node);
6428 Gen_Id : constant Node_Id := Name (Inst_Node);
6429 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6430 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6431 Act_Spec : constant Node_Id := Specification (Act_Decl);
6432 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
6434 Act_Body_Name : Node_Id;
6436 Gen_Body_Id : Node_Id;
6438 Act_Body_Id : Entity_Id;
6440 Parent_Installed : Boolean := False;
6441 Save_Style_Check : Boolean := Style_Check;
6444 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6445 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6447 if No (Gen_Body_Id) then
6448 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6449 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6452 -- Establish global variable for sloc adjustment and for error
6455 Instantiation_Node := Inst_Node;
6457 if Present (Gen_Body_Id) then
6458 Save_Env (Gen_Unit, Act_Decl_Id);
6459 Style_Check := False;
6460 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6462 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6464 Create_Instantiation_Source
6465 (Inst_Node, Gen_Body_Id, S_Adjustment);
6469 (Original_Node (Gen_Body), Empty, Instantiating => True);
6471 -- Build new name (possibly qualified) for body declaration.
6473 Act_Body_Id := New_Copy (Act_Decl_Id);
6475 -- Some attributes of the spec entity are not inherited by the
6478 Set_Handler_Records (Act_Body_Id, No_List);
6480 if Nkind (Defining_Unit_Name (Act_Spec)) =
6481 N_Defining_Program_Unit_Name
6484 Make_Defining_Program_Unit_Name (Loc,
6485 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
6486 Defining_Identifier => Act_Body_Id);
6488 Act_Body_Name := Act_Body_Id;
6491 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
6493 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
6494 Check_Generic_Actuals (Act_Decl_Id, False);
6496 -- If it is a child unit, make the parent instance (which is an
6497 -- instance of the parent of the generic) visible. The parent
6498 -- instance is the prefix of the name of the generic unit.
6500 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6501 and then Nkind (Gen_Id) = N_Expanded_Name
6503 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6504 Parent_Installed := True;
6506 elsif Is_Child_Unit (Gen_Unit) then
6507 Install_Parent (Scope (Gen_Unit), In_Body => True);
6508 Parent_Installed := True;
6511 -- If the instantiation is a library unit, and this is the main
6512 -- unit, then build the resulting compilation unit nodes for the
6513 -- instance. If this is a compilation unit but it is not the main
6514 -- unit, then it is the body of a unit in the context, that is being
6515 -- compiled because it is encloses some inlined unit or another
6516 -- generic unit being instantiated. In that case, this body is not
6517 -- part of the current compilation, and is not attached to the tree,
6518 -- but its parent must be set for analysis.
6520 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6522 if Parent (Inst_Node) = Cunit (Main_Unit) then
6523 Build_Instance_Compilation_Unit_Nodes
6524 (Inst_Node, Act_Body, Act_Decl);
6525 Analyze (Inst_Node);
6527 -- If the instance is a child unit itself, then set the
6528 -- scope of the expanded body to be the parent of the
6529 -- instantiation (ensuring that the fully qualified name
6530 -- will be generated for the elaboration subprogram).
6532 if Nkind (Defining_Unit_Name (Act_Spec)) =
6533 N_Defining_Program_Unit_Name
6536 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
6540 Set_Parent (Act_Body, Parent (Inst_Node));
6544 -- Case where instantiation is not a library unit
6547 -- If this is an early instantiation, i.e. appears textually
6548 -- before the corresponding body and must be elaborated first,
6549 -- indicate that the body instance is to be delayed.
6551 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
6553 -- Now analyze the body. We turn off all checks if this is
6554 -- an internal unit, since there is no reason to have checks
6555 -- on for any predefined run-time library code. All such
6556 -- code is designed to be compiled with checks off.
6558 -- Note that we do NOT apply this criterion to children of
6559 -- GNAT (or on VMS, children of DEC). The latter units must
6560 -- suppress checks explicitly if this is needed.
6562 if Is_Predefined_File_Name
6563 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
6565 Analyze (Act_Body, Suppress => All_Checks);
6571 if not Generic_Separately_Compiled (Gen_Unit) then
6572 Inherit_Context (Gen_Body, Inst_Node);
6575 Restore_Private_Views (Act_Decl_Id);
6577 Style_Check := Save_Style_Check;
6579 -- If we have no body, and the unit requires a body, then complain.
6580 -- This complaint is suppressed if we have detected other errors
6581 -- (since a common reason for missing the body is that it had errors).
6583 elsif Unit_Requires_Body (Gen_Unit) then
6584 if Errors_Detected = 0 then
6586 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
6588 -- Don't attempt to perform any cleanup actions if some other
6589 -- error was aready detected, since this can cause blowups.
6595 -- Case of package that does not need a body
6598 -- If the instantiation of the declaration is a library unit,
6599 -- rewrite the original package instantiation as a package
6600 -- declaration in the compilation unit node.
6602 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6603 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
6604 Rewrite (Inst_Node, Act_Decl);
6606 -- If the instantiation is not a library unit, then append the
6607 -- declaration to the list of implicitly generated entities.
6608 -- unless it is already a list member which means that it was
6609 -- already processed
6611 elsif not Is_List_Member (Act_Decl) then
6612 Mark_Rewrite_Insertion (Act_Decl);
6613 Insert_Before (Inst_Node, Act_Decl);
6617 Expander_Mode_Restore;
6619 -- Remove the parent instances if they have been placed on the
6620 -- scope stack to compile the body.
6622 if Parent_Installed then
6623 Remove_Parent (In_Body => True);
6625 end Instantiate_Package_Body;
6627 ---------------------------------
6628 -- Instantiate_Subprogram_Body --
6629 ---------------------------------
6631 procedure Instantiate_Subprogram_Body
6632 (Body_Info : Pending_Body_Info)
6634 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
6635 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
6636 Loc : constant Source_Ptr := Sloc (Inst_Node);
6639 Gen_Id : constant Node_Id := Name (Inst_Node);
6640 Gen_Unit : constant Entity_Id := Entity (Name (Inst_Node));
6641 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
6642 Anon_Id : constant Entity_Id :=
6643 Defining_Unit_Name (Specification (Act_Decl));
6645 Gen_Body_Id : Node_Id;
6647 Act_Body_Id : Entity_Id;
6648 Pack_Id : Entity_Id := Defining_Unit_Name (Parent (Act_Decl));
6649 Pack_Body : Node_Id;
6650 Prev_Formal : Entity_Id;
6651 Unit_Renaming : Node_Id;
6653 Parent_Installed : Boolean := False;
6654 Save_Style_Check : Boolean := Style_Check;
6657 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6659 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
6661 if No (Gen_Body_Id) then
6662 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
6663 Gen_Body_Id := Corresponding_Body (Gen_Decl);
6666 Instantiation_Node := Inst_Node;
6668 if Present (Gen_Body_Id) then
6669 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
6671 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
6673 -- Either body is not present, or context is non-expanding, as
6674 -- when compiling a subunit. Mark the instance as completed.
6676 Set_Has_Completion (Anon_Id);
6680 Save_Env (Gen_Unit, Anon_Id);
6681 Style_Check := False;
6682 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
6683 Create_Instantiation_Source (Inst_Node, Gen_Body_Id, S_Adjustment);
6687 (Original_Node (Gen_Body), Empty, Instantiating => True);
6688 Act_Body_Id := Defining_Entity (Act_Body);
6689 Set_Chars (Act_Body_Id, Chars (Anon_Id));
6690 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
6691 Set_Corresponding_Spec (Act_Body, Anon_Id);
6692 Set_Has_Completion (Anon_Id);
6693 Check_Generic_Actuals (Pack_Id, False);
6695 -- If it is a child unit, make the parent instance (which is an
6696 -- instance of the parent of the generic) visible. The parent
6697 -- instance is the prefix of the name of the generic unit.
6699 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
6700 and then Nkind (Gen_Id) = N_Expanded_Name
6702 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
6703 Parent_Installed := True;
6705 elsif Is_Child_Unit (Gen_Unit) then
6706 Install_Parent (Scope (Gen_Unit), In_Body => True);
6707 Parent_Installed := True;
6710 -- Inside its body, a reference to the generic unit is a reference
6711 -- to the instance. The corresponding renaming is the first
6712 -- declaration in the body.
6715 Make_Subprogram_Renaming_Declaration (Loc,
6718 Specification (Original_Node (Gen_Body)),
6720 Instantiating => True),
6721 Name => New_Occurrence_Of (Anon_Id, Loc));
6723 -- If there is a formal subprogram with the same name as the
6724 -- unit itself, do not add this renaming declaration. This is
6725 -- a temporary fix for one ACVC test. ???
6727 Prev_Formal := First_Entity (Pack_Id);
6728 while Present (Prev_Formal) loop
6729 if Chars (Prev_Formal) = Chars (Gen_Unit)
6730 and then Is_Overloadable (Prev_Formal)
6735 Next_Entity (Prev_Formal);
6738 if Present (Prev_Formal) then
6739 Decls := New_List (Act_Body);
6741 Decls := New_List (Unit_Renaming, Act_Body);
6744 -- The subprogram body is placed in the body of a dummy package
6745 -- body, whose spec contains the subprogram declaration as well
6746 -- as the renaming declarations for the generic parameters.
6748 Pack_Body := Make_Package_Body (Loc,
6749 Defining_Unit_Name => New_Copy (Pack_Id),
6750 Declarations => Decls);
6752 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6754 -- If the instantiation is a library unit, then build resulting
6755 -- compilation unit nodes for the instance. The declaration of
6756 -- the enclosing package is the grandparent of the subprogram
6757 -- declaration. First replace the instantiation node as the unit
6758 -- of the corresponding compilation.
6760 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
6762 if Parent (Inst_Node) = Cunit (Main_Unit) then
6763 Set_Unit (Parent (Inst_Node), Inst_Node);
6764 Build_Instance_Compilation_Unit_Nodes
6765 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
6766 Analyze (Inst_Node);
6768 Set_Parent (Pack_Body, Parent (Inst_Node));
6769 Analyze (Pack_Body);
6773 Insert_Before (Inst_Node, Pack_Body);
6774 Mark_Rewrite_Insertion (Pack_Body);
6775 Analyze (Pack_Body);
6777 if Expander_Active then
6778 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
6782 if not Generic_Separately_Compiled (Gen_Unit) then
6783 Inherit_Context (Gen_Body, Inst_Node);
6786 Restore_Private_Views (Pack_Id, False);
6788 if Parent_Installed then
6789 Remove_Parent (In_Body => True);
6793 Style_Check := Save_Style_Check;
6795 -- Body not found. Error was emitted already. If there were no
6796 -- previous errors, this may be an instance whose scope is a premature
6797 -- instance. In that case we must insure that the (legal) program does
6798 -- raise program error if executed. We generate a subprogram body for
6799 -- this purpose. See DEC ac30vso.
6801 elsif Errors_Detected = 0
6802 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
6804 if Ekind (Anon_Id) = E_Procedure then
6806 Make_Subprogram_Body (Loc,
6808 Make_Procedure_Specification (Loc,
6809 Defining_Unit_Name => New_Copy (Anon_Id),
6810 Parameter_Specifications =>
6812 (Parameter_Specifications (Parent (Anon_Id)))),
6814 Declarations => Empty_List,
6815 Handled_Statement_Sequence =>
6816 Make_Handled_Sequence_Of_Statements (Loc,
6818 New_List (Make_Raise_Program_Error (Loc))));
6821 Make_Subprogram_Body (Loc,
6823 Make_Function_Specification (Loc,
6824 Defining_Unit_Name => New_Copy (Anon_Id),
6825 Parameter_Specifications =>
6827 (Parameter_Specifications (Parent (Anon_Id))),
6829 New_Occurrence_Of (Etype (Anon_Id), Loc)),
6831 Declarations => Empty_List,
6832 Handled_Statement_Sequence =>
6833 Make_Handled_Sequence_Of_Statements (Loc,
6834 Statements => New_List (
6835 Make_Return_Statement (Loc,
6836 Expression => Make_Raise_Program_Error (Loc)))));
6839 Pack_Body := Make_Package_Body (Loc,
6840 Defining_Unit_Name => New_Copy (Pack_Id),
6841 Declarations => New_List (Act_Body));
6843 Insert_After (Inst_Node, Pack_Body);
6844 Set_Corresponding_Spec (Pack_Body, Pack_Id);
6845 Analyze (Pack_Body);
6848 Expander_Mode_Restore;
6849 end Instantiate_Subprogram_Body;
6851 ----------------------
6852 -- Instantiate_Type --
6853 ----------------------
6855 function Instantiate_Type
6858 Analyzed_Formal : Node_Id)
6861 Loc : constant Source_Ptr := Sloc (Actual);
6862 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
6863 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
6864 Ancestor : Entity_Id;
6865 Def : constant Node_Id := Formal_Type_Definition (Formal);
6867 Decl_Node : Node_Id;
6869 procedure Validate_Array_Type_Instance;
6870 procedure Validate_Access_Subprogram_Instance;
6871 procedure Validate_Access_Type_Instance;
6872 procedure Validate_Derived_Type_Instance;
6873 procedure Validate_Private_Type_Instance;
6874 -- These procedures perform validation tests for the named case
6876 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
6877 -- Check that base types are the same and that the subtypes match
6878 -- statically. Used in several of the above.
6880 --------------------
6881 -- Subtypes_Match --
6882 --------------------
6884 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
6885 T : constant Entity_Id := Get_Instance_Of (Gen_T);
6888 return (Base_Type (T) = Base_Type (Act_T)
6889 -- why is the and then commented out here???
6890 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
6891 and then Subtypes_Statically_Match (T, Act_T))
6893 or else (Is_Class_Wide_Type (Gen_T)
6894 and then Is_Class_Wide_Type (Act_T)
6897 Get_Instance_Of (Root_Type (Gen_T)),
6898 Root_Type (Act_T)));
6901 -----------------------------------------
6902 -- Validate_Access_Subprogram_Instance --
6903 -----------------------------------------
6905 procedure Validate_Access_Subprogram_Instance is
6907 if not Is_Access_Type (Act_T)
6908 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
6911 ("expect access type in instantiation of &", Actual, Gen_T);
6912 Abandon_Instantiation (Actual);
6915 Check_Mode_Conformant
6916 (Designated_Type (Act_T),
6917 Designated_Type (A_Gen_T),
6921 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
6922 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
6924 ("protected access type not allowed for formal &",
6928 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
6930 ("expect protected access type for formal &",
6933 end Validate_Access_Subprogram_Instance;
6935 -----------------------------------
6936 -- Validate_Access_Type_Instance --
6937 -----------------------------------
6939 procedure Validate_Access_Type_Instance is
6940 Desig_Type : Entity_Id :=
6941 Find_Actual_Type (Designated_Type (A_Gen_T), Scope (A_Gen_T));
6944 if not Is_Access_Type (Act_T) then
6946 ("expect access type in instantiation of &", Actual, Gen_T);
6947 Abandon_Instantiation (Actual);
6950 if Is_Access_Constant (A_Gen_T) then
6951 if not Is_Access_Constant (Act_T) then
6953 ("actual type must be access-to-constant type", Actual);
6954 Abandon_Instantiation (Actual);
6957 if Is_Access_Constant (Act_T) then
6959 ("actual type must be access-to-variable type", Actual);
6960 Abandon_Instantiation (Actual);
6962 elsif Ekind (A_Gen_T) = E_General_Access_Type
6963 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
6965 Error_Msg_N ("actual must be general access type!", Actual);
6966 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
6967 Abandon_Instantiation (Actual);
6971 -- The designated subtypes, that is to say the subtypes introduced
6972 -- by an access type declaration (and not by a subtype declaration)
6975 if not Subtypes_Match
6976 (Desig_Type, Designated_Type (Base_Type (Act_T)))
6979 ("designated type of actual does not match that of formal &",
6981 Abandon_Instantiation (Actual);
6983 elsif Is_Access_Type (Designated_Type (Act_T))
6984 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
6986 Is_Constrained (Designated_Type (Desig_Type))
6989 ("designated type of actual does not match that of formal &",
6991 Abandon_Instantiation (Actual);
6993 end Validate_Access_Type_Instance;
6995 ----------------------------------
6996 -- Validate_Array_Type_Instance --
6997 ----------------------------------
6999 procedure Validate_Array_Type_Instance is
7004 function Formal_Dimensions return Int;
7005 -- Count number of dimensions in array type formal
7007 function Formal_Dimensions return Int is
7012 if Nkind (Def) = N_Constrained_Array_Definition then
7013 Index := First (Discrete_Subtype_Definitions (Def));
7015 Index := First (Subtype_Marks (Def));
7018 while Present (Index) loop
7024 end Formal_Dimensions;
7026 -- Start of processing for Validate_Array_Type_Instance
7029 if not Is_Array_Type (Act_T) then
7031 ("expect array type in instantiation of &", Actual, Gen_T);
7032 Abandon_Instantiation (Actual);
7034 elsif Nkind (Def) = N_Constrained_Array_Definition then
7035 if not (Is_Constrained (Act_T)) then
7037 ("expect constrained array in instantiation of &",
7039 Abandon_Instantiation (Actual);
7043 if Is_Constrained (Act_T) then
7045 ("expect unconstrained array in instantiation of &",
7047 Abandon_Instantiation (Actual);
7051 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7053 ("dimensions of actual do not match formal &", Actual, Gen_T);
7054 Abandon_Instantiation (Actual);
7057 I1 := First_Index (A_Gen_T);
7058 I2 := First_Index (Act_T);
7059 for J in 1 .. Formal_Dimensions loop
7061 -- If the indices of the actual were given by a subtype_mark,
7062 -- the index was transformed into a range attribute. Retrieve
7063 -- the original type mark for checking.
7065 if Is_Entity_Name (Original_Node (I2)) then
7066 T2 := Entity (Original_Node (I2));
7071 if not Subtypes_Match
7072 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7075 ("index types of actual do not match those of formal &",
7077 Abandon_Instantiation (Actual);
7084 if not Subtypes_Match (
7085 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7086 Component_Type (Act_T))
7089 ("component subtype of actual does not match that of formal &",
7091 Abandon_Instantiation (Actual);
7094 if Has_Aliased_Components (A_Gen_T)
7095 and then not Has_Aliased_Components (Act_T)
7098 ("actual must have aliased components to match formal type &",
7102 end Validate_Array_Type_Instance;
7104 ------------------------------------
7105 -- Validate_Derived_Type_Instance --
7106 ------------------------------------
7108 procedure Validate_Derived_Type_Instance is
7109 Actual_Discr : Entity_Id;
7110 Ancestor_Discr : Entity_Id;
7113 -- If the parent type in the generic declaration is itself
7114 -- a previous formal type, then it is local to the generic
7115 -- and absent from the analyzed generic definition. In that
7116 -- case the ancestor is the instance of the formal (which must
7117 -- have been instantiated previously). Otherwise, the analyzed
7118 -- generic carries the parent type. If the parent type is defined
7119 -- in a previous formal package, then the scope of that formal
7120 -- package is that of the generic type itself, and it has already
7121 -- been mapped into the corresponding type in the actual package.
7123 -- Common case: parent type defined outside of the generic.
7125 if Is_Entity_Name (Subtype_Mark (Def))
7126 and then Present (Entity (Subtype_Mark (Def)))
7128 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
7130 -- Check whether parent is defined in a previous formal package.
7133 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
7136 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
7138 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) then
7140 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
7143 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
7146 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
7148 ("expect type derived from & in instantiation",
7149 Actual, First_Subtype (Ancestor));
7150 Abandon_Instantiation (Actual);
7153 -- Perform atomic/volatile checks (RM C.6(12))
7155 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
7157 ("cannot have atomic actual type for non-atomic formal type",
7160 elsif Is_Volatile (Act_T)
7161 and then not Is_Volatile (Ancestor)
7162 and then Is_By_Reference_Type (Ancestor)
7165 ("cannot have volatile actual type for non-volatile formal type",
7169 -- It should not be necessary to check for unknown discriminants
7170 -- on Formal, but for some reason Has_Unknown_Discriminants is
7171 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
7172 -- returns False. This needs fixing. ???
7174 if not Is_Indefinite_Subtype (A_Gen_T)
7175 and then not Unknown_Discriminants_Present (Formal)
7176 and then Is_Indefinite_Subtype (Act_T)
7179 ("actual subtype must be constrained", Actual);
7180 Abandon_Instantiation (Actual);
7183 if not Unknown_Discriminants_Present (Formal) then
7184 if Is_Constrained (Ancestor) then
7185 if not Is_Constrained (Act_T) then
7187 ("actual subtype must be constrained", Actual);
7188 Abandon_Instantiation (Actual);
7191 -- Ancestor is unconstrained
7193 elsif Is_Constrained (Act_T) then
7194 if Ekind (Ancestor) = E_Access_Type
7195 or else Is_Composite_Type (Ancestor)
7198 ("actual subtype must be unconstrained", Actual);
7199 Abandon_Instantiation (Actual);
7202 -- A class-wide type is only allowed if the formal has
7203 -- unknown discriminants.
7205 elsif Is_Class_Wide_Type (Act_T)
7206 and then not Has_Unknown_Discriminants (Ancestor)
7209 ("actual for & cannot be a class-wide type", Actual, Gen_T);
7210 Abandon_Instantiation (Actual);
7212 -- Otherwise, the formal and actual shall have the same
7213 -- number of discriminants and each discriminant of the
7214 -- actual must correspond to a discriminant of the formal.
7216 elsif Has_Discriminants (Act_T)
7217 and then Has_Discriminants (Ancestor)
7219 Actual_Discr := First_Discriminant (Act_T);
7220 Ancestor_Discr := First_Discriminant (Ancestor);
7221 while Present (Actual_Discr)
7222 and then Present (Ancestor_Discr)
7224 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
7225 not Present (Corresponding_Discriminant (Actual_Discr))
7228 ("discriminant & does not correspond " &
7229 "to ancestor discriminant", Actual, Actual_Discr);
7230 Abandon_Instantiation (Actual);
7233 Next_Discriminant (Actual_Discr);
7234 Next_Discriminant (Ancestor_Discr);
7237 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
7239 ("actual for & must have same number of discriminants",
7241 Abandon_Instantiation (Actual);
7244 -- This case should be caught by the earlier check for
7245 -- for constrainedness, but the check here is added for
7248 elsif Has_Discriminants (Act_T) then
7250 ("actual for & must not have discriminants", Actual, Gen_T);
7251 Abandon_Instantiation (Actual);
7253 elsif Has_Discriminants (Ancestor) then
7255 ("actual for & must have known discriminants", Actual, Gen_T);
7256 Abandon_Instantiation (Actual);
7259 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
7261 ("constraint on actual is incompatible with formal", Actual);
7262 Abandon_Instantiation (Actual);
7266 end Validate_Derived_Type_Instance;
7268 ------------------------------------
7269 -- Validate_Private_Type_Instance --
7270 ------------------------------------
7272 procedure Validate_Private_Type_Instance is
7273 Formal_Discr : Entity_Id;
7274 Actual_Discr : Entity_Id;
7275 Formal_Subt : Entity_Id;
7278 if (Is_Limited_Type (Act_T)
7279 or else Is_Limited_Composite (Act_T))
7280 and then not Is_Limited_Type (A_Gen_T)
7283 ("actual for non-limited & cannot be a limited type", Actual,
7285 Abandon_Instantiation (Actual);
7287 elsif Is_Indefinite_Subtype (Act_T)
7288 and then not Is_Indefinite_Subtype (A_Gen_T)
7292 ("actual for & must be a definite subtype", Actual, Gen_T);
7294 elsif not Is_Tagged_Type (Act_T)
7295 and then Is_Tagged_Type (A_Gen_T)
7298 ("actual for & must be a tagged type", Actual, Gen_T);
7300 elsif Has_Discriminants (A_Gen_T) then
7301 if not Has_Discriminants (Act_T) then
7303 ("actual for & must have discriminants", Actual, Gen_T);
7304 Abandon_Instantiation (Actual);
7306 elsif Is_Constrained (Act_T) then
7308 ("actual for & must be unconstrained", Actual, Gen_T);
7309 Abandon_Instantiation (Actual);
7312 Formal_Discr := First_Discriminant (A_Gen_T);
7313 Actual_Discr := First_Discriminant (Act_T);
7314 while Formal_Discr /= Empty loop
7315 if Actual_Discr = Empty then
7317 ("discriminants on actual do not match formal",
7319 Abandon_Instantiation (Actual);
7322 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
7324 -- access discriminants match if designated types do.
7326 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
7327 and then (Ekind (Base_Type (Etype (Actual_Discr))))
7328 = E_Anonymous_Access_Type
7329 and then Get_Instance_Of (
7330 Designated_Type (Base_Type (Formal_Subt)))
7331 = Designated_Type (Base_Type (Etype (Actual_Discr)))
7335 elsif Base_Type (Formal_Subt) /=
7336 Base_Type (Etype (Actual_Discr))
7339 ("types of actual discriminants must match formal",
7341 Abandon_Instantiation (Actual);
7343 elsif not Subtypes_Statically_Match
7344 (Formal_Subt, Etype (Actual_Discr))
7348 ("subtypes of actual discriminants must match formal",
7350 Abandon_Instantiation (Actual);
7353 Next_Discriminant (Formal_Discr);
7354 Next_Discriminant (Actual_Discr);
7357 if Actual_Discr /= Empty then
7359 ("discriminants on actual do not match formal",
7361 Abandon_Instantiation (Actual);
7368 end Validate_Private_Type_Instance;
7370 -- Start of processing for Instantiate_Type
7373 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
7374 Error_Msg_N ("duplicate instantiation of generic type", Actual);
7377 elsif not Is_Entity_Name (Actual)
7378 or else not Is_Type (Entity (Actual))
7381 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
7382 Abandon_Instantiation (Actual);
7385 Act_T := Entity (Actual);
7387 if Ekind (Act_T) = E_Incomplete_Type then
7388 if No (Underlying_Type (Act_T)) then
7389 Error_Msg_N ("premature use of incomplete type", Actual);
7390 Abandon_Instantiation (Actual);
7392 Act_T := Full_View (Act_T);
7393 Set_Entity (Actual, Act_T);
7395 if Has_Private_Component (Act_T) then
7397 ("premature use of type with private component", Actual);
7401 elsif Is_Private_Type (Act_T)
7402 and then Is_Private_Type (Base_Type (Act_T))
7403 and then not Is_Generic_Type (Act_T)
7404 and then not Is_Derived_Type (Act_T)
7405 and then No (Full_View (Root_Type (Act_T)))
7407 Error_Msg_N ("premature use of private type", Actual);
7409 elsif Has_Private_Component (Act_T) then
7411 ("premature use of type with private component", Actual);
7414 Set_Instance_Of (A_Gen_T, Act_T);
7416 -- If the type is generic, the class-wide type may also be used
7418 if Is_Tagged_Type (A_Gen_T)
7419 and then Is_Tagged_Type (Act_T)
7420 and then not Is_Class_Wide_Type (A_Gen_T)
7422 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
7423 Class_Wide_Type (Act_T));
7426 if not Is_Abstract (A_Gen_T)
7427 and then Is_Abstract (Act_T)
7430 ("actual of non-abstract formal cannot be abstract", Actual);
7433 if Is_Scalar_Type (Gen_T) then
7434 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
7439 when N_Formal_Private_Type_Definition =>
7440 Validate_Private_Type_Instance;
7442 when N_Formal_Derived_Type_Definition =>
7443 Validate_Derived_Type_Instance;
7445 when N_Formal_Discrete_Type_Definition =>
7446 if not Is_Discrete_Type (Act_T) then
7448 ("expect discrete type in instantiation of&", Actual, Gen_T);
7449 Abandon_Instantiation (Actual);
7452 when N_Formal_Signed_Integer_Type_Definition =>
7453 if not Is_Signed_Integer_Type (Act_T) then
7455 ("expect signed integer type in instantiation of&",
7457 Abandon_Instantiation (Actual);
7460 when N_Formal_Modular_Type_Definition =>
7461 if not Is_Modular_Integer_Type (Act_T) then
7463 ("expect modular type in instantiation of &", Actual, Gen_T);
7464 Abandon_Instantiation (Actual);
7467 when N_Formal_Floating_Point_Definition =>
7468 if not Is_Floating_Point_Type (Act_T) then
7470 ("expect float type in instantiation of &", Actual, Gen_T);
7471 Abandon_Instantiation (Actual);
7474 when N_Formal_Ordinary_Fixed_Point_Definition =>
7475 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
7477 ("expect ordinary fixed point type in instantiation of &",
7479 Abandon_Instantiation (Actual);
7482 when N_Formal_Decimal_Fixed_Point_Definition =>
7483 if not Is_Decimal_Fixed_Point_Type (Act_T) then
7485 ("expect decimal type in instantiation of &",
7487 Abandon_Instantiation (Actual);
7490 when N_Array_Type_Definition =>
7491 Validate_Array_Type_Instance;
7493 when N_Access_To_Object_Definition =>
7494 Validate_Access_Type_Instance;
7496 when N_Access_Function_Definition |
7497 N_Access_Procedure_Definition =>
7498 Validate_Access_Subprogram_Instance;
7501 raise Program_Error;
7506 Make_Subtype_Declaration (Loc,
7507 Defining_Identifier => New_Copy (Gen_T),
7508 Subtype_Indication => New_Reference_To (Act_T, Loc));
7510 if Is_Private_Type (Act_T) then
7511 Set_Has_Private_View (Subtype_Indication (Decl_Node));
7514 -- Flag actual derived types so their elaboration produces the
7515 -- appropriate renamings for the primitive operations of the ancestor.
7516 -- Flag actual for formal private types as well, to determine whether
7517 -- operations in the private part may override inherited operations.
7519 if Nkind (Def) = N_Formal_Derived_Type_Definition
7520 or else Nkind (Def) = N_Formal_Private_Type_Definition
7522 Set_Generic_Parent_Type (Decl_Node, Ancestor);
7526 end Instantiate_Type;
7528 ---------------------
7529 -- Is_In_Main_Unit --
7530 ---------------------
7532 function Is_In_Main_Unit (N : Node_Id) return Boolean is
7533 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
7535 Current_Unit : Node_Id;
7538 if Unum = Main_Unit then
7541 -- If the current unit is a subunit then it is either the main unit
7542 -- or is being compiled as part of the main unit.
7544 elsif Nkind (N) = N_Compilation_Unit then
7545 return Nkind (Unit (N)) = N_Subunit;
7548 Current_Unit := Parent (N);
7549 while Present (Current_Unit)
7550 and then Nkind (Current_Unit) /= N_Compilation_Unit
7552 Current_Unit := Parent (Current_Unit);
7555 -- The instantiation node is in the main unit, or else the current
7556 -- node (perhaps as the result of nested instantiations) is in the
7557 -- main unit, or in the declaration of the main unit, which in this
7558 -- last case must be a body.
7560 return Unum = Main_Unit
7561 or else Current_Unit = Cunit (Main_Unit)
7562 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
7563 or else (Present (Library_Unit (Current_Unit))
7564 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
7565 end Is_In_Main_Unit;
7567 ----------------------------
7568 -- Load_Parent_Of_Generic --
7569 ----------------------------
7571 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
7572 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
7573 True_Parent : Node_Id;
7574 Inst_Node : Node_Id;
7576 Save_Style_Check : Boolean := Style_Check;
7579 if not In_Same_Source_Unit (N, Spec)
7580 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
7581 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
7582 and then not Is_In_Main_Unit (Spec))
7584 -- Find body of parent of spec, and analyze it. A special case
7585 -- arises when the parent is an instantiation, that is to say when
7586 -- we are currently instantiating a nested generic. In that case,
7587 -- there is no separate file for the body of the enclosing instance.
7588 -- Instead, the enclosing body must be instantiated as if it were
7589 -- a pending instantiation, in order to produce the body for the
7590 -- nested generic we require now. Note that in that case the
7591 -- generic may be defined in a package body, the instance defined
7592 -- in the same package body, and the original enclosing body may not
7593 -- be in the main unit.
7595 True_Parent := Parent (Spec);
7598 while Present (True_Parent)
7599 and then Nkind (True_Parent) /= N_Compilation_Unit
7601 if Nkind (True_Parent) = N_Package_Declaration
7603 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
7605 -- Parent is a compilation unit that is an instantiation.
7606 -- Instantiation node has been replaced with package decl.
7608 Inst_Node := Original_Node (True_Parent);
7611 elsif Nkind (True_Parent) = N_Package_Declaration
7612 and then Present (Generic_Parent (Specification (True_Parent)))
7614 -- Parent is an instantiation within another specification.
7615 -- Declaration for instance has been inserted before original
7616 -- instantiation node. A direct link would be preferable?
7618 Inst_Node := Next (True_Parent);
7620 while Present (Inst_Node)
7621 and then Nkind (Inst_Node) /= N_Package_Instantiation
7626 -- If the instance appears within a generic, and the generic
7627 -- unit is defined within a formal package of the enclosing
7628 -- generic, there is no generic body available, and none
7629 -- needed. A more precise test should be used ???
7631 if No (Inst_Node) then
7637 True_Parent := Parent (True_Parent);
7641 if Present (Inst_Node) then
7643 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
7645 -- Instantiation node and declaration of instantiated package
7646 -- were exchanged when only the declaration was needed.
7647 -- Restore instantiation node before proceeding with body.
7649 Set_Unit (Parent (True_Parent), Inst_Node);
7652 -- Now complete instantiation of enclosing body, if it appears
7653 -- in some other unit. If it appears in the current unit, the
7654 -- body will have been instantiated already.
7656 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
7657 Instantiate_Package_Body
7658 (Pending_Body_Info'(
7659 Inst_Node, True_Parent, Expander_Active,
7660 Get_Code_Unit (Sloc (Inst_Node))));
7664 Opt.Style_Check := False;
7665 Load_Needed_Body (Comp_Unit, OK);
7666 Opt.Style_Check := Save_Style_Check;
7669 and then Unit_Requires_Body (Defining_Entity (Spec))
7672 Bname : constant Unit_Name_Type :=
7673 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
7676 Error_Msg_Unit_1 := Bname;
7677 Error_Msg_N ("this instantiation requires$!", N);
7679 Get_File_Name (Bname, Subunit => False);
7680 Error_Msg_N ("\but file{ was not found!", N);
7681 raise Unrecoverable_Error;
7687 -- If loading the parent of the generic caused an instantiation
7688 -- circularity, we abandon compilation at this point, because
7689 -- otherwise in some cases we get into trouble with infinite
7690 -- recursions after this point.
7692 if Circularity_Detected then
7693 raise Unrecoverable_Error;
7696 end Load_Parent_Of_Generic;
7698 -----------------------
7699 -- Move_Freeze_Nodes --
7700 -----------------------
7702 procedure Move_Freeze_Nodes
7703 (Out_Of : Entity_Id;
7708 Next_Decl : Node_Id;
7709 Next_Node : Node_Id := After;
7712 function Is_Outer_Type (T : Entity_Id) return Boolean;
7713 -- Check whether entity is declared in a scope external to that
7714 -- of the generic unit.
7720 function Is_Outer_Type (T : Entity_Id) return Boolean is
7721 Scop : Entity_Id := Scope (T);
7724 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
7728 while Scop /= Standard_Standard loop
7730 if Scop = Out_Of then
7733 Scop := Scope (Scop);
7741 -- Start of processing for Move_Freeze_Nodes
7748 -- First remove the freeze nodes that may appear before all other
7752 while Present (Decl)
7753 and then Nkind (Decl) = N_Freeze_Entity
7754 and then Is_Outer_Type (Entity (Decl))
7756 Decl := Remove_Head (L);
7757 Insert_After (Next_Node, Decl);
7758 Set_Analyzed (Decl, False);
7763 -- Next scan the list of declarations and remove each freeze node that
7764 -- appears ahead of the current node.
7766 while Present (Decl) loop
7767 while Present (Next (Decl))
7768 and then Nkind (Next (Decl)) = N_Freeze_Entity
7769 and then Is_Outer_Type (Entity (Next (Decl)))
7771 Next_Decl := Remove_Next (Decl);
7772 Insert_After (Next_Node, Next_Decl);
7773 Set_Analyzed (Next_Decl, False);
7774 Next_Node := Next_Decl;
7777 -- If the declaration is a nested package or concurrent type, then
7778 -- recurse. Nested generic packages will have been processed from the
7781 if Nkind (Decl) = N_Package_Declaration then
7782 Spec := Specification (Decl);
7784 elsif Nkind (Decl) = N_Task_Type_Declaration then
7785 Spec := Task_Definition (Decl);
7787 elsif Nkind (Decl) = N_Protected_Type_Declaration then
7788 Spec := Protected_Definition (Decl);
7794 if Present (Spec) then
7795 Move_Freeze_Nodes (Out_Of, Next_Node,
7796 Visible_Declarations (Spec));
7797 Move_Freeze_Nodes (Out_Of, Next_Node,
7798 Private_Declarations (Spec));
7803 end Move_Freeze_Nodes;
7809 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
7811 return Generic_Renamings.Table (E).Next_In_HTable;
7814 ------------------------
7815 -- Preanalyze_Actuals --
7816 ------------------------
7818 procedure Pre_Analyze_Actuals (N : Node_Id) is
7821 Errs : Int := Errors_Detected;
7824 Assoc := First (Generic_Associations (N));
7826 while Present (Assoc) loop
7827 Act := Explicit_Generic_Actual_Parameter (Assoc);
7829 -- Within a nested instantiation, a defaulted actual is an
7830 -- empty association, so nothing to analyze. If the actual for
7831 -- a subprogram is an attribute, analyze prefix only, because
7832 -- actual is not a complete attribute reference.
7833 -- String literals may be operators, but at this point we do not
7834 -- know whether the actual is a formal subprogram or a string.
7839 elsif Nkind (Act) = N_Attribute_Reference then
7840 Analyze (Prefix (Act));
7842 elsif Nkind (Act) = N_Explicit_Dereference then
7843 Analyze (Prefix (Act));
7845 elsif Nkind (Act) /= N_Operator_Symbol then
7849 if Errs /= Errors_Detected then
7850 Abandon_Instantiation (Act);
7855 end Pre_Analyze_Actuals;
7861 procedure Remove_Parent (In_Body : Boolean := False) is
7862 S : Entity_Id := Current_Scope;
7868 -- After child instantiation is complete, remove from scope stack
7869 -- the extra copy of the current scope, and then remove parent
7875 while Current_Scope /= S loop
7877 End_Package_Scope (Current_Scope);
7879 if In_Open_Scopes (P) then
7880 E := First_Entity (P);
7882 while Present (E) loop
7883 Set_Is_Immediately_Visible (E, True);
7887 elsif not In_Open_Scopes (Scope (P)) then
7888 Set_Is_Immediately_Visible (P, False);
7892 -- Reset visibility of entities in the enclosing scope.
7894 Set_Is_Hidden_Open_Scope (Current_Scope, False);
7895 Hidden := First_Elmt (Hidden_Entities);
7897 while Present (Hidden) loop
7898 Set_Is_Immediately_Visible (Node (Hidden), True);
7903 -- Each body is analyzed separately, and there is no context
7904 -- that needs preserving from one body instance to the next,
7905 -- so remove all parent scopes that have been installed.
7907 while Present (S) loop
7908 End_Package_Scope (S);
7910 exit when S = Standard_Standard;
7920 procedure Restore_Env is
7921 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
7924 Ada_83 := Saved.Ada_83;
7926 if No (Current_Instantiated_Parent.Act_Id) then
7928 -- Restore environment after subprogram inlining
7930 Restore_Private_Views (Empty);
7933 Current_Instantiated_Parent := Saved.Instantiated_Parent;
7934 Exchanged_Views := Saved.Exchanged_Views;
7935 Hidden_Entities := Saved.Hidden_Entities;
7936 Current_Sem_Unit := Saved.Current_Sem_Unit;
7938 Instance_Envs.Decrement_Last;
7941 ---------------------------
7942 -- Restore_Private_Views --
7943 ---------------------------
7945 procedure Restore_Private_Views
7946 (Pack_Id : Entity_Id;
7947 Is_Package : Boolean := True)
7956 M := First_Elmt (Exchanged_Views);
7957 while Present (M) loop
7960 -- Subtypes of types whose views have been exchanged, and that
7961 -- are defined within the instance, were not on the list of
7962 -- Private_Dependents on entry to the instance, so they have to
7963 -- be exchanged explicitly now, in order to remain consistent with
7964 -- the view of the parent type.
7966 if Ekind (Typ) = E_Private_Type
7967 or else Ekind (Typ) = E_Limited_Private_Type
7968 or else Ekind (Typ) = E_Record_Type_With_Private
7970 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
7972 while Present (Dep_Elmt) loop
7973 Dep_Typ := Node (Dep_Elmt);
7975 if Scope (Dep_Typ) = Pack_Id
7976 and then Present (Full_View (Dep_Typ))
7978 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
7979 Exchange_Declarations (Dep_Typ);
7982 Next_Elmt (Dep_Elmt);
7986 Exchange_Declarations (Node (M));
7990 if No (Pack_Id) then
7994 -- Make the generic formal parameters private, and make the formal
7995 -- types into subtypes of the actuals again.
7997 E := First_Entity (Pack_Id);
7999 while Present (E) loop
8000 Set_Is_Hidden (E, True);
8003 and then Nkind (Parent (E)) = N_Subtype_Declaration
8005 Set_Is_Generic_Actual_Type (E, False);
8007 -- An unusual case of aliasing: the actual may also be directly
8008 -- visible in the generic, and be private there, while it is
8009 -- fully visible in the context of the instance. The internal
8010 -- subtype is private in the instance, but has full visibility
8011 -- like its parent in the enclosing scope. This enforces the
8012 -- invariant that the privacy status of all private dependents of
8013 -- a type coincide with that of the parent type. This can only
8014 -- happen when a generic child unit is instantiated within a
8017 if Is_Private_Type (E)
8018 and then not Is_Private_Type (Etype (E))
8020 Exchange_Declarations (E);
8023 elsif Ekind (E) = E_Package then
8025 -- The end of the renaming list is the renaming of the generic
8026 -- package itself. If the instance is a subprogram, all entities
8027 -- in the corresponding package are renamings. If this entity is
8028 -- a formal package, make its own formals private as well. The
8029 -- actual in this case is itself the renaming of an instantation.
8030 -- If the entity is not a package renaming, it is the entity
8031 -- created to validate formal package actuals: ignore.
8033 -- If the actual is itself a formal package for the enclosing
8034 -- generic, or the actual for such a formal package, it remains
8035 -- visible after the current instance, and therefore nothing
8036 -- needs to be done either, except to keep it accessible.
8039 and then Renamed_Object (E) = Pack_Id
8043 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
8046 elsif Denotes_Formal_Package (Renamed_Object (E)) then
8047 Set_Is_Hidden (E, False);
8051 Act_P : Entity_Id := Renamed_Object (E);
8052 Id : Entity_Id := First_Entity (Act_P);
8056 and then Id /= First_Private_Entity (Act_P)
8058 Set_Is_Hidden (Id, True);
8059 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
8060 exit when Ekind (Id) = E_Package
8061 and then Renamed_Object (Id) = Act_P;
8072 end Restore_Private_Views;
8079 (Gen_Unit : Entity_Id;
8080 Act_Unit : Entity_Id)
8082 Saved : Instance_Env;
8085 Saved.Ada_83 := Ada_83;
8086 Saved.Instantiated_Parent := Current_Instantiated_Parent;
8087 Saved.Exchanged_Views := Exchanged_Views;
8088 Saved.Hidden_Entities := Hidden_Entities;
8089 Saved.Current_Sem_Unit := Current_Sem_Unit;
8090 Instance_Envs.Increment_Last;
8091 Instance_Envs.Table (Instance_Envs.Last) := Saved;
8093 -- Regardless of the current mode, predefined units are analyzed in
8094 -- Ada95 mode, and Ada83 checks don't apply.
8096 if Is_Internal_File_Name
8097 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
8098 Renamings_Included => True) then
8102 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
8103 Exchanged_Views := New_Elmt_List;
8104 Hidden_Entities := New_Elmt_List;
8107 ----------------------------
8108 -- Save_Global_References --
8109 ----------------------------
8111 procedure Save_Global_References (N : Node_Id) is
8112 Gen_Scope : Entity_Id;
8116 function Is_Global (E : Entity_Id) return Boolean;
8117 -- Check whether entity is defined outside of generic unit.
8118 -- Examine the scope of an entity, and the scope of the scope,
8119 -- etc, until we find either Standard, in which case the entity
8120 -- is global, or the generic unit itself, which indicates that
8121 -- the entity is local. If the entity is the generic unit itself,
8122 -- as in the case of a recursive call, or the enclosing generic unit,
8123 -- if different from the current scope, then it is local as well,
8124 -- because it will be replaced at the point of instantiation. On
8125 -- the other hand, if it is a reference to a child unit of a common
8126 -- ancestor, which appears in an instantiation, it is global because
8127 -- it is used to denote a specific compilation unit at the time the
8128 -- instantiations will be analyzed.
8130 procedure Reset_Entity (N : Node_Id);
8131 -- Save semantic information on global entity, so that it is not
8132 -- resolved again at instantiation time.
8134 procedure Save_Global_Defaults (N1, N2 : Node_Id);
8135 -- Default actuals in nested instances must be handled specially
8136 -- because there is no link to them from the original tree. When an
8137 -- actual subprogram is given by a default, we add an explicit generic
8138 -- association for it in the instantiation node. When we save the
8139 -- global references on the name of the instance, we recover the list
8140 -- of generic associations, and add an explicit one to the original
8141 -- generic tree, through which a global actual can be preserved.
8142 -- Similarly, if a child unit is instantiated within a sibling, in the
8143 -- context of the parent, we must preserve the identifier of the parent
8144 -- so that it can be properly resolved in a subsequent instantiation.
8146 procedure Save_Global_Descendant (D : Union_Id);
8147 -- Apply Save_Global_References recursively to the descendents of
8150 procedure Save_References (N : Node_Id);
8151 -- This is the recursive procedure that does the work, once the
8152 -- enclosing generic scope has been established.
8158 function Is_Global (E : Entity_Id) return Boolean is
8159 Se : Entity_Id := Scope (E);
8161 function Is_Instance_Node (Decl : Node_Id) return Boolean;
8162 -- Determine whether the parent node of a reference to a child unit
8163 -- denotes an instantiation or a formal package, in which case the
8164 -- reference to the child unit is global, even if it appears within
8165 -- the current scope (e.g. when the instance appears within the body
8168 function Is_Instance_Node (Decl : Node_Id) return Boolean is
8170 return (Nkind (Decl) in N_Generic_Instantiation
8172 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
8173 end Is_Instance_Node;
8175 -- Start of processing for Is_Global
8178 if E = Gen_Scope then
8181 elsif E = Standard_Standard then
8184 elsif Is_Child_Unit (E)
8185 and then (Is_Instance_Node (Parent (N2))
8186 or else (Nkind (Parent (N2)) = N_Expanded_Name
8187 and then N2 = Selector_Name (Parent (N2))
8188 and then Is_Instance_Node (Parent (Parent (N2)))))
8193 while Se /= Gen_Scope loop
8194 if Se = Standard_Standard then
8209 procedure Reset_Entity (N : Node_Id) is
8211 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
8212 -- The type of N2 is global to the generic unit. Save the
8213 -- type in the generic node.
8215 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
8216 Typ : constant Entity_Id := Etype (N2);
8222 and then Has_Private_View (Entity (N))
8224 -- If the entity of N is not the associated node, this is
8225 -- a nested generic and it has an associated node as well,
8226 -- whose type is already the full view (see below). Indicate
8227 -- that the original node has a private view.
8229 Set_Has_Private_View (N);
8232 -- If not a private type, nothing else to do
8234 if not Is_Private_Type (Typ) then
8235 if Is_Array_Type (Typ)
8236 and then Is_Private_Type (Component_Type (Typ))
8238 Set_Has_Private_View (N);
8241 -- If it is a derivation of a private type in a context where
8242 -- no full view is needed, nothing to do either.
8244 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
8247 -- Otherwise mark the type for flipping and use the full_view
8251 Set_Has_Private_View (N);
8253 if Present (Full_View (Typ)) then
8254 Set_Etype (N2, Full_View (Typ));
8257 end Set_Global_Type;
8259 -- Start of processing for Reset_Entity
8262 N2 := Associated_Node (N);
8266 if Is_Global (E) then
8267 Set_Global_Type (N, N2);
8269 elsif Nkind (N) = N_Op_Concat
8270 and then Is_Generic_Type (Etype (N2))
8272 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
8273 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
8274 and then Is_Intrinsic_Subprogram (E)
8279 -- Entity is local. Mark generic node as unresolved.
8280 -- Note that now it does not have an entity.
8282 Set_Associated_Node (N, Empty);
8283 Set_Etype (N, Empty);
8286 if (Nkind (Parent (N)) = N_Package_Instantiation
8287 or else Nkind (Parent (N)) = N_Function_Instantiation
8288 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
8289 and then N = Name (Parent (N))
8291 Save_Global_Defaults (Parent (N), Parent (N2));
8294 elsif Nkind (Parent (N)) = N_Selected_Component
8295 and then Nkind (Parent (N2)) = N_Expanded_Name
8298 if Is_Global (Entity (Parent (N2))) then
8299 Change_Selected_Component_To_Expanded_Name (Parent (N));
8300 Set_Associated_Node (Parent (N), Parent (N2));
8301 Set_Global_Type (Parent (N), Parent (N2));
8303 Save_Global_Descendant (Field2 (N));
8304 Save_Global_Descendant (Field3 (N));
8306 -- If this is a reference to the current generic entity,
8307 -- replace it with a simple name. This is to avoid anomalies
8308 -- when the enclosing scope is also a generic unit, in which
8309 -- case the selected component will not resolve to the current
8310 -- unit within an instance of the outer one. Ditto if the
8311 -- entity is an enclosing scope, e.g. a parent unit.
8313 elsif In_Open_Scopes (Entity (Parent (N2)))
8314 and then not Is_Generic_Unit (Entity (Prefix (Parent (N2))))
8316 Rewrite (Parent (N),
8317 Make_Identifier (Sloc (N),
8318 Chars => Chars (Selector_Name (Parent (N2)))));
8321 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
8322 or else Nkind (Parent (Parent (N)))
8323 = N_Function_Instantiation
8324 or else Nkind (Parent (Parent (N)))
8325 = N_Procedure_Instantiation)
8326 and then Parent (N) = Name (Parent (Parent (N)))
8328 Save_Global_Defaults
8329 (Parent (Parent (N)), Parent (Parent ((N2))));
8332 -- A selected component may denote a static constant that has
8333 -- been folded. Make the same replacement in original tree.
8335 elsif Nkind (Parent (N)) = N_Selected_Component
8336 and then (Nkind (Parent (N2)) = N_Integer_Literal
8337 or else Nkind (Parent (N2)) = N_Real_Literal)
8339 Rewrite (Parent (N),
8340 New_Copy (Parent (N2)));
8341 Set_Analyzed (Parent (N), False);
8343 -- a selected component may be transformed into a parameterless
8344 -- function call. If the called entity is global, rewrite the
8345 -- node appropriately, i.e. as an extended name for the global
8348 elsif Nkind (Parent (N)) = N_Selected_Component
8349 and then Nkind (Parent (N2)) = N_Function_Call
8350 and then Is_Global (Entity (Name (Parent (N2))))
8352 Change_Selected_Component_To_Expanded_Name (Parent (N));
8353 Set_Associated_Node (Parent (N), Name (Parent (N2)));
8354 Set_Global_Type (Parent (N), Name (Parent (N2)));
8356 Save_Global_Descendant (Field2 (N));
8357 Save_Global_Descendant (Field3 (N));
8360 -- Entity is local. Reset in generic unit, so that node
8361 -- is resolved anew at the point of instantiation.
8363 Set_Associated_Node (N, Empty);
8364 Set_Etype (N, Empty);
8368 --------------------------
8369 -- Save_Global_Defaults --
8370 --------------------------
8372 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
8373 Loc : constant Source_Ptr := Sloc (N1);
8374 Assoc1 : List_Id := Generic_Associations (N1);
8375 Assoc2 : List_Id := Generic_Associations (N2);
8379 Gen_Id : Entity_Id := Entity (Name (N2));
8385 if Present (Assoc1) then
8386 Act1 := First (Assoc1);
8389 Set_Generic_Associations (N1, New_List);
8390 Assoc1 := Generic_Associations (N1);
8393 if Present (Assoc2) then
8394 Act2 := First (Assoc2);
8399 while Present (Act1) and then Present (Act2) loop
8404 -- Find the associations added for default suprograms.
8406 if Present (Act2) then
8407 while Nkind (Act2) /= N_Generic_Association
8408 or else No (Entity (Selector_Name (Act2)))
8409 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
8414 -- Add a similar association if the default is global. The
8415 -- renaming declaration for the actual has been analyzed, and
8416 -- its alias is the program it renames. Link the actual in the
8417 -- original generic tree with the node in the analyzed tree.
8419 while Present (Act2) loop
8420 Subp := Entity (Selector_Name (Act2));
8421 Def := Explicit_Generic_Actual_Parameter (Act2);
8423 -- Following test is defence against rubbish errors
8425 if No (Alias (Subp)) then
8429 -- Retrieve the resolved actual from the renaming declaration
8430 -- created for the instantiated formal.
8432 Actual := Entity (Name (Parent (Parent (Subp))));
8433 Set_Entity (Def, Actual);
8434 Set_Etype (Def, Etype (Actual));
8436 if Is_Global (Actual) then
8438 Make_Generic_Association (Loc,
8439 Selector_Name => New_Occurrence_Of (Subp, Loc),
8440 Explicit_Generic_Actual_Parameter =>
8441 New_Occurrence_Of (Actual, Loc));
8444 (Explicit_Generic_Actual_Parameter (Ndec), Def);
8446 Append (Ndec, Assoc1);
8448 -- If there are other defaults, add a dummy association
8449 -- in case there are other defaulted formals with the same
8452 elsif Present (Next (Act2)) then
8454 Make_Generic_Association (Loc,
8455 Selector_Name => New_Occurrence_Of (Subp, Loc),
8456 Explicit_Generic_Actual_Parameter => Empty);
8458 Append (Ndec, Assoc1);
8465 if Nkind (Name (N1)) = N_Identifier
8466 and then Is_Child_Unit (Gen_Id)
8467 and then Is_Global (Gen_Id)
8468 and then Is_Generic_Unit (Scope (Gen_Id))
8469 and then In_Open_Scopes (Scope (Gen_Id))
8471 -- This is an instantiation of a child unit within a sibling,
8472 -- so that the generic parent is in scope. An eventual instance
8473 -- must occur within the scope of an instance of the parent.
8474 -- Make name in instance into an expanded name, to preserve the
8475 -- identifier of the parent, so it can be resolved subsequently.
8478 Make_Expanded_Name (Loc,
8479 Chars => Chars (Gen_Id),
8480 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8481 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8482 Set_Entity (Name (N2), Gen_Id);
8485 Make_Expanded_Name (Loc,
8486 Chars => Chars (Gen_Id),
8487 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
8488 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
8490 Set_Associated_Node (Name (N1), Name (N2));
8491 Set_Associated_Node (Prefix (Name (N1)), Empty);
8493 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
8494 Set_Etype (Name (N1), Etype (Gen_Id));
8497 end Save_Global_Defaults;
8499 ----------------------------
8500 -- Save_Global_Descendant --
8501 ----------------------------
8503 procedure Save_Global_Descendant (D : Union_Id) is
8507 if D in Node_Range then
8508 if D = Union_Id (Empty) then
8511 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
8512 Save_References (Node_Id (D));
8515 elsif D in List_Range then
8516 if D = Union_Id (No_List)
8517 or else Is_Empty_List (List_Id (D))
8522 N1 := First (List_Id (D));
8523 while Present (N1) loop
8524 Save_References (N1);
8529 -- Element list or other non-node field, nothing to do
8534 end Save_Global_Descendant;
8536 ---------------------
8537 -- Save_References --
8538 ---------------------
8540 -- This is the recursive procedure that does the work, once the
8541 -- enclosing generic scope has been established. We have to treat
8542 -- specially a number of node rewritings that are required by semantic
8543 -- processing and which change the kind of nodes in the generic copy:
8544 -- typically constant-folding, replacing an operator node by a string
8545 -- literal, or a selected component by an expanded name. In each of
8546 -- those cases, the transformation is propagated to the generic unit.
8548 procedure Save_References (N : Node_Id) is
8553 elsif (Nkind (N) = N_Character_Literal
8554 or else Nkind (N) = N_Operator_Symbol)
8556 if Nkind (N) = Nkind (Associated_Node (N)) then
8559 elsif Nkind (N) = N_Operator_Symbol
8560 and then Nkind (Associated_Node (N)) = N_String_Literal
8562 Change_Operator_Symbol_To_String_Literal (N);
8565 elsif Nkind (N) in N_Op then
8567 if Nkind (N) = Nkind (Associated_Node (N)) then
8569 if Nkind (N) = N_Op_Concat then
8570 Set_Is_Component_Left_Opnd (N,
8571 Is_Component_Left_Opnd (Associated_Node (N)));
8573 Set_Is_Component_Right_Opnd (N,
8574 Is_Component_Right_Opnd (Associated_Node (N)));
8579 -- Node may be transformed into call to a user-defined operator
8581 N2 := Associated_Node (N);
8583 if Nkind (N2) = N_Function_Call then
8584 E := Entity (Name (N2));
8587 and then Is_Global (E)
8589 Set_Etype (N, Etype (N2));
8591 Set_Associated_Node (N, Empty);
8592 Set_Etype (N, Empty);
8595 elsif Nkind (N2) = N_Integer_Literal
8596 or else Nkind (N2) = N_Real_Literal
8597 or else Nkind (N2) = N_String_Literal
8598 or else (Nkind (N2) = N_Identifier
8600 Ekind (Entity (N2)) = E_Enumeration_Literal)
8602 -- Operation was constant-folded, perform the same
8603 -- replacement in generic.
8605 -- Note: we do a Replace here rather than a Rewrite,
8606 -- which is a definite violation of the standard rules
8607 -- with regard to retrievability of the original tree,
8608 -- and likely ASIS bugs or at least irregularities are
8609 -- caused by this choice.
8611 -- The reason we do this is that the appropriate original
8612 -- nodes are never constructed (we don't go applying the
8613 -- generic instantiation to rewritten nodes in general).
8614 -- We could try to create an appropriate copy but it would
8615 -- be hard work and does not seem worth while, because
8616 -- the original expression is accessible in the generic,
8617 -- and ASIS rules for traversing instances are fuzzy.
8619 Replace (N, New_Copy (N2));
8620 Set_Analyzed (N, False);
8624 -- Complete the check on operands.
8626 Save_Global_Descendant (Field2 (N));
8627 Save_Global_Descendant (Field3 (N));
8629 elsif Nkind (N) = N_Identifier then
8630 if Nkind (N) = Nkind (Associated_Node (N)) then
8632 -- If this is a discriminant reference, always save it.
8633 -- It is used in the instance to find the corresponding
8634 -- discriminant positionally rather than by name.
8636 Set_Original_Discriminant
8637 (N, Original_Discriminant (Associated_Node (N)));
8641 N2 := Associated_Node (N);
8643 if Nkind (N2) = N_Function_Call then
8644 E := Entity (Name (N2));
8646 -- Name resolves to a call to parameterless function.
8647 -- If original entity is global, mark node as resolved.
8650 and then Is_Global (E)
8652 Set_Etype (N, Etype (N2));
8654 Set_Associated_Node (N, Empty);
8655 Set_Etype (N, Empty);
8659 Nkind (N2) = N_Integer_Literal or else
8660 Nkind (N2) = N_Real_Literal or else
8661 Nkind (N2) = N_String_Literal
8663 -- Name resolves to named number that is constant-folded,
8664 -- or to string literal from concatenation.
8665 -- Perform the same replacement in generic.
8667 Rewrite (N, New_Copy (N2));
8668 Set_Analyzed (N, False);
8670 elsif Nkind (N2) = N_Explicit_Dereference then
8672 -- An identifier is rewritten as a dereference if it is
8673 -- the prefix in a selected component, and it denotes an
8674 -- access to a composite type, or a parameterless function
8675 -- call that returns an access type.
8677 -- Check whether corresponding entity in prefix is global.
8679 if Is_Entity_Name (Prefix (N2))
8680 and then Present (Entity (Prefix (N2)))
8681 and then Is_Global (Entity (Prefix (N2)))
8684 Make_Explicit_Dereference (Sloc (N),
8685 Prefix => Make_Identifier (Sloc (N),
8686 Chars => Chars (N))));
8687 Set_Associated_Node (Prefix (N), Prefix (N2));
8689 elsif Nkind (Prefix (N2)) = N_Function_Call
8690 and then Is_Global (Entity (Name (Prefix (N2))))
8693 Make_Explicit_Dereference (Sloc (N),
8694 Prefix => Make_Function_Call (Sloc (N),
8696 Make_Identifier (Sloc (N),
8697 Chars => Chars (N)))));
8700 (Name (Prefix (N)), Name (Prefix (N2)));
8703 Set_Associated_Node (N, Empty);
8704 Set_Etype (N, Empty);
8707 -- The subtype mark of a nominally unconstrained object
8708 -- is rewritten as a subtype indication using the bounds
8709 -- of the expression. Recover the original subtype mark.
8711 elsif Nkind (N2) = N_Subtype_Indication
8712 and then Is_Entity_Name (Original_Node (N2))
8714 Set_Associated_Node (N, Original_Node (N2));
8722 elsif Nkind (N) in N_Entity then
8725 elsif Nkind (N) = N_Aggregate
8726 or else Nkind (N) = N_Extension_Aggregate
8728 N2 := Associated_Node (N);
8730 or else No (Etype (N2))
8731 or else not Is_Global (Etype (N2))
8733 Set_Associated_Node (N, Empty);
8736 Save_Global_Descendant (Field1 (N));
8737 Save_Global_Descendant (Field2 (N));
8738 Save_Global_Descendant (Field3 (N));
8739 Save_Global_Descendant (Field5 (N));
8742 Save_Global_Descendant (Field1 (N));
8743 Save_Global_Descendant (Field2 (N));
8744 Save_Global_Descendant (Field3 (N));
8745 Save_Global_Descendant (Field4 (N));
8746 Save_Global_Descendant (Field5 (N));
8749 end Save_References;
8751 -- Start of processing for Save_Global_References
8754 Gen_Scope := Current_Scope;
8756 -- If the generic unit is a child unit, references to entities in
8757 -- the parent are treated as local, because they will be resolved
8758 -- anew in the context of the instance of the parent.
8760 while Is_Child_Unit (Gen_Scope)
8761 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
8763 Gen_Scope := Scope (Gen_Scope);
8766 Save_References (N);
8767 end Save_Global_References;
8769 -------------------------
8770 -- Set_Associated_Node --
8771 -------------------------
8773 -- Note from RBKD: the uncommented use of Set_Node4 below is ugly ???
8775 procedure Set_Associated_Node
8776 (Gen_Node : Node_Id;
8777 Copy_Node : Node_Id)
8780 Set_Node4 (Gen_Node, Copy_Node);
8781 end Set_Associated_Node;
8783 ---------------------
8784 -- Set_Copied_Sloc --
8785 ---------------------
8787 procedure Set_Copied_Sloc (N : Node_Id; E : Entity_Id) is
8789 Create_Instantiation_Source (N, E, S_Adjustment);
8790 end Set_Copied_Sloc;
8792 ---------------------
8793 -- Set_Instance_Of --
8794 ---------------------
8796 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
8798 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
8799 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
8800 Generic_Renamings.Increment_Last;
8801 end Set_Instance_Of;
8803 --------------------
8804 -- Set_Next_Assoc --
8805 --------------------
8807 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
8809 Generic_Renamings.Table (E).Next_In_HTable := Next;
8816 procedure Start_Generic is
8818 -- ??? I am sure more things could be factored out in this
8819 -- routine. Should probably be done at a later stage.
8821 Generic_Flags.Increment_Last;
8822 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
8823 Inside_A_Generic := True;
8825 Expander_Mode_Save_And_Set (False);
8832 procedure Switch_View (T : Entity_Id) is
8833 Priv_Elmt : Elmt_Id := No_Elmt;
8834 Priv_Sub : Entity_Id;
8835 BT : Entity_Id := Base_Type (T);
8838 -- T may be private but its base type may have been exchanged through
8839 -- some other occurrence, in which case there is nothing to switch.
8841 if not Is_Private_Type (BT) then
8845 Priv_Elmt := First_Elmt (Private_Dependents (BT));
8847 if Present (Full_View (BT)) then
8848 Append_Elmt (Full_View (BT), Exchanged_Views);
8849 Exchange_Declarations (BT);
8852 while Present (Priv_Elmt) loop
8853 Priv_Sub := (Node (Priv_Elmt));
8855 -- We avoid flipping the subtype if the Etype of its full
8856 -- view is private because this would result in a malformed
8857 -- subtype. This occurs when the Etype of the subtype full
8858 -- view is the full view of the base type (and since the
8859 -- base types were just switched, the subtype is pointing
8860 -- to the wrong view). This is currently the case for
8861 -- tagged record types, access types (maybe more?) and
8862 -- needs to be resolved. ???
8864 if Present (Full_View (Priv_Sub))
8865 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
8867 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
8868 Exchange_Declarations (Priv_Sub);
8871 Next_Elmt (Priv_Elmt);
8875 -----------------------------
8876 -- Valid_Default_Attribute --
8877 -----------------------------
8879 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
8880 Attr_Id : constant Attribute_Id :=
8881 Get_Attribute_Id (Attribute_Name (Def));
8884 T : Entity_Id := Entity (Prefix (Def));
8886 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
8896 F := First_Formal (Nam);
8897 while Present (F) loop
8903 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
8904 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
8905 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
8906 Attribute_Unbiased_Rounding =>
8907 OK := (Is_Fun and then Num_F = 1 and then Is_Floating_Point_Type (T));
8909 when Attribute_Image | Attribute_Pred | Attribute_Succ |
8910 Attribute_Value | Attribute_Wide_Image |
8911 Attribute_Wide_Value =>
8912 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
8914 when Attribute_Max | Attribute_Min =>
8915 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
8917 when Attribute_Input =>
8918 OK := (Is_Fun and then Num_F = 1);
8920 when Attribute_Output | Attribute_Read | Attribute_Write =>
8921 OK := (not Is_Fun and then Num_F = 2);
8923 when others => OK := False;
8927 Error_Msg_N ("attribute reference has wrong profile for subprogram",
8930 end Valid_Default_Attribute;