1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Expander; use Expander;
32 with Fname; use Fname;
33 with Fname.UF; use Fname.UF;
34 with Freeze; use Freeze;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
39 with Lib.Xref; use Lib.Xref;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Rident; use Rident;
44 with Restrict; use Restrict;
45 with Rtsfind; use Rtsfind;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch3; use Sem_Ch3;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Ch10; use Sem_Ch10;
53 with Sem_Ch13; use Sem_Ch13;
54 with Sem_Elab; use Sem_Elab;
55 with Sem_Elim; use Sem_Elim;
56 with Sem_Eval; use Sem_Eval;
57 with Sem_Res; use Sem_Res;
58 with Sem_Type; use Sem_Type;
59 with Sem_Util; use Sem_Util;
60 with Sem_Warn; use Sem_Warn;
61 with Stand; use Stand;
62 with Sinfo; use Sinfo;
63 with Sinfo.CN; use Sinfo.CN;
64 with Sinput; use Sinput;
65 with Sinput.L; use Sinput.L;
66 with Snames; use Snames;
67 with Stringt; use Stringt;
68 with Uname; use Uname;
70 with Tbuild; use Tbuild;
71 with Uintp; use Uintp;
72 with Urealp; use Urealp;
76 package body Sem_Ch12 is
78 ----------------------------------------------------------
79 -- Implementation of Generic Analysis and Instantiation --
80 -----------------------------------------------------------
82 -- GNAT implements generics by macro expansion. No attempt is made to
83 -- share generic instantiations (for now). Analysis of a generic definition
84 -- does not perform any expansion action, but the expander must be called
85 -- on the tree for each instantiation, because the expansion may of course
86 -- depend on the generic actuals. All of this is best achieved as follows:
88 -- a) Semantic analysis of a generic unit is performed on a copy of the
89 -- tree for the generic unit. All tree modifications that follow analysis
90 -- do not affect the original tree. Links are kept between the original
91 -- tree and the copy, in order to recognize non-local references within
92 -- the generic, and propagate them to each instance (recall that name
93 -- resolution is done on the generic declaration: generics are not really
94 -- macros!). This is summarized in the following diagram:
96 -- .-----------. .----------.
97 -- | semantic |<--------------| generic |
99 -- | |==============>| |
100 -- |___________| global |__________|
111 -- b) Each instantiation copies the original tree, and inserts into it a
112 -- series of declarations that describe the mapping between generic formals
113 -- and actuals. For example, a generic In OUT parameter is an object
114 -- renaming of the corresponing actual, etc. Generic IN parameters are
115 -- constant declarations.
117 -- c) In order to give the right visibility for these renamings, we use
118 -- a different scheme for package and subprogram instantiations. For
119 -- packages, the list of renamings is inserted into the package
120 -- specification, before the visible declarations of the package. The
121 -- renamings are analyzed before any of the text of the instance, and are
122 -- thus visible at the right place. Furthermore, outside of the instance,
123 -- the generic parameters are visible and denote their corresponding
126 -- For subprograms, we create a container package to hold the renamings
127 -- and the subprogram instance itself. Analysis of the package makes the
128 -- renaming declarations visible to the subprogram. After analyzing the
129 -- package, the defining entity for the subprogram is touched-up so that
130 -- it appears declared in the current scope, and not inside the container
133 -- If the instantiation is a compilation unit, the container package is
134 -- given the same name as the subprogram instance. This ensures that
135 -- the elaboration procedure called by the binder, using the compilation
136 -- unit name, calls in fact the elaboration procedure for the package.
138 -- Not surprisingly, private types complicate this approach. By saving in
139 -- the original generic object the non-local references, we guarantee that
140 -- the proper entities are referenced at the point of instantiation.
141 -- However, for private types, this by itself does not insure that the
142 -- proper VIEW of the entity is used (the full type may be visible at the
143 -- point of generic definition, but not at instantiation, or vice-versa).
144 -- In order to reference the proper view, we special-case any reference
145 -- to private types in the generic object, by saving both views, one in
146 -- the generic and one in the semantic copy. At time of instantiation, we
147 -- check whether the two views are consistent, and exchange declarations if
148 -- necessary, in order to restore the correct visibility. Similarly, if
149 -- the instance view is private when the generic view was not, we perform
150 -- the exchange. After completing the instantiation, we restore the
151 -- current visibility. The flag Has_Private_View marks identifiers in the
152 -- the generic unit that require checking.
154 -- Visibility within nested generic units requires special handling.
155 -- Consider the following scheme:
157 -- type Global is ... -- outside of generic unit.
161 -- type Semi_Global is ... -- global to inner.
164 -- procedure inner (X1 : Global; X2 : Semi_Global);
166 -- procedure in2 is new inner (...); -- 4
169 -- package New_Outer is new Outer (...); -- 2
170 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
172 -- The semantic analysis of Outer captures all occurrences of Global.
173 -- The semantic analysis of Inner (at 1) captures both occurrences of
174 -- Global and Semi_Global.
176 -- At point 2 (instantiation of Outer), we also produce a generic copy
177 -- of Inner, even though Inner is, at that point, not being instantiated.
178 -- (This is just part of the semantic analysis of New_Outer).
180 -- Critically, references to Global within Inner must be preserved, while
181 -- references to Semi_Global should not preserved, because they must now
182 -- resolve to an entity within New_Outer. To distinguish between these, we
183 -- use a global variable, Current_Instantiated_Parent, which is set when
184 -- performing a generic copy during instantiation (at 2). This variable is
185 -- used when performing a generic copy that is not an instantiation, but
186 -- that is nested within one, as the occurrence of 1 within 2. The analysis
187 -- of a nested generic only preserves references that are global to the
188 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
189 -- determine whether a reference is external to the given parent.
191 -- The instantiation at point 3 requires no special treatment. The method
192 -- works as well for further nestings of generic units, but of course the
193 -- variable Current_Instantiated_Parent must be stacked because nested
194 -- instantiations can occur, e.g. the occurrence of 4 within 2.
196 -- The instantiation of package and subprogram bodies is handled in a
197 -- similar manner, except that it is delayed until after semantic
198 -- analysis is complete. In this fashion complex cross-dependencies
199 -- between several package declarations and bodies containing generics
200 -- can be compiled which otherwise would diagnose spurious circularities.
202 -- For example, it is possible to compile two packages A and B that
203 -- have the following structure:
205 -- package A is package B is
206 -- generic ... generic ...
207 -- package G_A is package G_B is
210 -- package body A is package body B is
211 -- package N_B is new G_B (..) package N_A is new G_A (..)
213 -- The table Pending_Instantiations in package Inline is used to keep
214 -- track of body instantiations that are delayed in this manner. Inline
215 -- handles the actual calls to do the body instantiations. This activity
216 -- is part of Inline, since the processing occurs at the same point, and
217 -- for essentially the same reason, as the handling of inlined routines.
219 ----------------------------------------------
220 -- Detection of Instantiation Circularities --
221 ----------------------------------------------
223 -- If we have a chain of instantiations that is circular, this is a
224 -- static error which must be detected at compile time. The detection
225 -- of these circularities is carried out at the point that we insert
226 -- a generic instance spec or body. If there is a circularity, then
227 -- the analysis of the offending spec or body will eventually result
228 -- in trying to load the same unit again, and we detect this problem
229 -- as we analyze the package instantiation for the second time.
231 -- At least in some cases after we have detected the circularity, we
232 -- get into trouble if we try to keep going. The following flag is
233 -- set if a circularity is detected, and used to abandon compilation
234 -- after the messages have been posted.
236 Circularity_Detected : Boolean := False;
237 -- This should really be reset on encountering a new main unit, but in
238 -- practice we are not using multiple main units so it is not critical.
240 -----------------------
241 -- Local subprograms --
242 -----------------------
244 procedure Abandon_Instantiation (N : Node_Id);
245 pragma No_Return (Abandon_Instantiation);
246 -- Posts an error message "instantiation abandoned" at the indicated
247 -- node and then raises the exception Instantiation_Error to do it.
249 procedure Analyze_Formal_Array_Type
250 (T : in out Entity_Id;
252 -- A formal array type is treated like an array type declaration, and
253 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
254 -- in-out, because in the case of an anonymous type the entity is
255 -- actually created in the procedure.
257 -- The following procedures treat other kinds of formal parameters.
259 procedure Analyze_Formal_Derived_Type
264 -- All the following need comments???
266 procedure Analyze_Formal_Decimal_Fixed_Point_Type
267 (T : Entity_Id; Def : Node_Id);
268 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
269 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
270 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
271 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
272 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
273 (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Private_Type
279 -- This needs comments???
281 procedure Analyze_Generic_Formal_Part (N : Node_Id);
283 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
284 -- This needs comments ???
286 function Analyze_Associations
289 F_Copy : List_Id) return List_Id;
290 -- At instantiation time, build the list of associations between formals
291 -- and actuals. Each association becomes a renaming declaration for the
292 -- formal entity. F_Copy is the analyzed list of formals in the generic
293 -- copy. It is used to apply legality checks to the actuals. I_Node is the
294 -- instantiation node itself.
296 procedure Analyze_Subprogram_Instantiation
300 procedure Build_Instance_Compilation_Unit_Nodes
304 -- This procedure is used in the case where the generic instance of a
305 -- subprogram body or package body is a library unit. In this case, the
306 -- original library unit node for the generic instantiation must be
307 -- replaced by the resulting generic body, and a link made to a new
308 -- compilation unit node for the generic declaration. The argument N is
309 -- the original generic instantiation. Act_Body and Act_Decl are the body
310 -- and declaration of the instance (either package body and declaration
311 -- nodes or subprogram body and declaration nodes depending on the case).
312 -- On return, the node N has been rewritten with the actual body.
314 procedure Check_Formal_Packages (P_Id : Entity_Id);
315 -- Apply the following to all formal packages in generic associations.
317 procedure Check_Formal_Package_Instance
318 (Formal_Pack : Entity_Id;
319 Actual_Pack : Entity_Id);
320 -- Verify that the actuals of the actual instance match the actuals of
321 -- the template for a formal package that is not declared with a box.
323 procedure Check_Forward_Instantiation (Decl : Node_Id);
324 -- If the generic is a local entity and the corresponding body has not
325 -- been seen yet, flag enclosing packages to indicate that it will be
326 -- elaborated after the generic body. Subprograms declared in the same
327 -- package cannot be inlined by the front-end because front-end inlining
328 -- requires a strict linear order of elaboration.
330 procedure Check_Hidden_Child_Unit
332 Gen_Unit : Entity_Id;
333 Act_Decl_Id : Entity_Id);
334 -- If the generic unit is an implicit child instance within a parent
335 -- instance, we need to make an explicit test that it is not hidden by
336 -- a child instance of the same name and parent.
338 procedure Check_Private_View (N : Node_Id);
339 -- Check whether the type of a generic entity has a different view between
340 -- the point of generic analysis and the point of instantiation. If the
341 -- view has changed, then at the point of instantiation we restore the
342 -- correct view to perform semantic analysis of the instance, and reset
343 -- the current view after instantiation. The processing is driven by the
344 -- current private status of the type of the node, and Has_Private_View,
345 -- a flag that is set at the point of generic compilation. If view and
346 -- flag are inconsistent then the type is updated appropriately.
348 procedure Check_Generic_Actuals
349 (Instance : Entity_Id;
350 Is_Formal_Box : Boolean);
351 -- Similar to previous one. Check the actuals in the instantiation,
352 -- whose views can change between the point of instantiation and the point
353 -- of instantiation of the body. In addition, mark the generic renamings
354 -- as generic actuals, so that they are not compatible with other actuals.
355 -- Recurse on an actual that is a formal package whose declaration has
358 function Contains_Instance_Of
361 N : Node_Id) return Boolean;
362 -- Inner is instantiated within the generic Outer. Check whether Inner
363 -- directly or indirectly contains an instance of Outer or of one of its
364 -- parents, in the case of a subunit. Each generic unit holds a list of
365 -- the entities instantiated within (at any depth). This procedure
366 -- determines whether the set of such lists contains a cycle, i.e. an
367 -- illegal circular instantiation.
369 function Denotes_Formal_Package
371 On_Exit : Boolean := False) return Boolean;
372 -- Returns True if E is a formal package of an enclosing generic, or
373 -- the actual for such a formal in an enclosing instantiation. If such
374 -- a package is used as a formal in an nested generic, or as an actual
375 -- in a nested instantiation, the visibility of ITS formals should not
376 -- be modified. When called from within Restore_Private_Views, the flag
377 -- On_Exit is true, to indicate that the search for a possible enclosing
378 -- instance should ignore the current one.
380 function Find_Actual_Type
382 Gen_Scope : Entity_Id) return Entity_Id;
383 -- When validating the actual types of a child instance, check whether
384 -- the formal is a formal type of the parent unit, and retrieve the current
385 -- actual for it. Typ is the entity in the analyzed formal type declaration
386 -- (component or index type of an array type) and Gen_Scope is the scope of
387 -- the analyzed formal array type.
389 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
390 -- Given the entity of a unit that is an instantiation, retrieve the
391 -- original instance node. This is used when loading the instantiations
392 -- of the ancestors of a child generic that is being instantiated.
394 function In_Same_Declarative_Part
396 Inst : Node_Id) return Boolean;
397 -- True if the instantiation Inst and the given freeze_node F_Node appear
398 -- within the same declarative part, ignoring subunits, but with no inter-
399 -- vening suprograms or concurrent units. If true, the freeze node
400 -- of the instance can be placed after the freeze node of the parent,
401 -- which it itself an instance.
403 function In_Main_Context (E : Entity_Id) return Boolean;
404 -- Check whether an instantiation is in the context of the main unit.
405 -- Used to determine whether its body should be elaborated to allow
406 -- front-end inlining.
408 procedure Set_Instance_Env
409 (Gen_Unit : Entity_Id;
410 Act_Unit : Entity_Id);
411 -- Save current instance on saved environment, to be used to determine
412 -- the global status of entities in nested instances. Part of Save_Env.
413 -- called after verifying that the generic unit is legal for the instance.
415 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
416 -- Associate analyzed generic parameter with corresponding
417 -- instance. Used for semantic checks at instantiation time.
419 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
420 -- Traverse the Exchanged_Views list to see if a type was private
421 -- and has already been flipped during this phase of instantiation.
423 procedure Hide_Current_Scope;
424 -- When compiling a generic child unit, the parent context must be
425 -- present, but the instance and all entities that may be generated
426 -- must be inserted in the current scope. We leave the current scope
427 -- on the stack, but make its entities invisible to avoid visibility
428 -- problems. This is reversed at the end of instantiations. This is
429 -- not done for the instantiation of the bodies, which only require the
430 -- instances of the generic parents to be in scope.
432 procedure Install_Body
437 -- If the instantiation happens textually before the body of the generic,
438 -- the instantiation of the body must be analyzed after the generic body,
439 -- and not at the point of instantiation. Such early instantiations can
440 -- happen if the generic and the instance appear in a package declaration
441 -- because the generic body can only appear in the corresponding package
442 -- body. Early instantiations can also appear if generic, instance and
443 -- body are all in the declarative part of a subprogram or entry. Entities
444 -- of packages that are early instantiations are delayed, and their freeze
445 -- node appears after the generic body.
447 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
448 -- Insert freeze node at the end of the declarative part that includes the
449 -- instance node N. If N is in the visible part of an enclosing package
450 -- declaration, the freeze node has to be inserted at the end of the
451 -- private declarations, if any.
453 procedure Freeze_Subprogram_Body
454 (Inst_Node : Node_Id;
456 Pack_Id : Entity_Id);
457 -- The generic body may appear textually after the instance, including
458 -- in the proper body of a stub, or within a different package instance.
459 -- Given that the instance can only be elaborated after the generic, we
460 -- place freeze_nodes for the instance and/or for packages that may enclose
461 -- the instance and the generic, so that the back-end can establish the
462 -- proper order of elaboration.
465 -- Establish environment for subsequent instantiation. Separated from
466 -- Save_Env because data-structures for visibility handling must be
467 -- initialized before call to Check_Generic_Child_Unit.
469 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
470 -- When compiling an instance of a child unit the parent (which is
471 -- itself an instance) is an enclosing scope that must be made
472 -- immediately visible. This procedure is also used to install the non-
473 -- generic parent of a generic child unit when compiling its body, so that
474 -- full views of types in the parent are made visible.
476 procedure Remove_Parent (In_Body : Boolean := False);
477 -- Reverse effect after instantiation of child is complete.
479 procedure Inline_Instance_Body
481 Gen_Unit : Entity_Id;
483 -- If front-end inlining is requested, instantiate the package body,
484 -- and preserve the visibility of its compilation unit, to insure
485 -- that successive instantiations succeed.
487 -- The functions Instantiate_XXX perform various legality checks and build
488 -- the declarations for instantiated generic parameters.
489 -- Need to describe what the parameters are ???
491 function Instantiate_Object
494 Analyzed_Formal : Node_Id) return List_Id;
496 function Instantiate_Type
499 Analyzed_Formal : Node_Id;
500 Actual_Decls : List_Id) return Node_Id;
502 function Instantiate_Formal_Subprogram
505 Analyzed_Formal : Node_Id) return Node_Id;
507 function Instantiate_Formal_Package
510 Analyzed_Formal : Node_Id) return List_Id;
511 -- If the formal package is declared with a box, special visibility rules
512 -- apply to its formals: they are in the visible part of the package. This
513 -- is true in the declarative region of the formal package, that is to say
514 -- in the enclosing generic or instantiation. For an instantiation, the
515 -- parameters of the formal package are made visible in an explicit step.
516 -- Furthermore, if the actual is a visible use_clause, these formals must
517 -- be made potentially use_visible as well. On exit from the enclosing
518 -- instantiation, the reverse must be done.
520 -- For a formal package declared without a box, there are conformance rules
521 -- that apply to the actuals in the generic declaration and the actuals of
522 -- the actual package in the enclosing instantiation. The simplest way to
523 -- apply these rules is to repeat the instantiation of the formal package
524 -- in the context of the enclosing instance, and compare the generic
525 -- associations of this instantiation with those of the actual package.
527 function Is_In_Main_Unit (N : Node_Id) return Boolean;
528 -- Test if given node is in the main unit
530 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
531 -- If the generic appears in a separate non-generic library unit,
532 -- load the corresponding body to retrieve the body of the generic.
533 -- N is the node for the generic instantiation, Spec is the generic
534 -- package declaration.
536 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
537 -- Add the context clause of the unit containing a generic unit to
538 -- an instantiation that is a compilation unit.
540 function Get_Associated_Node (N : Node_Id) return Node_Id;
541 -- In order to propagate semantic information back from the analyzed
542 -- copy to the original generic, we maintain links between selected nodes
543 -- in the generic and their corresponding copies. At the end of generic
544 -- analysis, the routine Save_Global_References traverses the generic
545 -- tree, examines the semantic information, and preserves the links to
546 -- those nodes that contain global information. At instantiation, the
547 -- information from the associated node is placed on the new copy, so
548 -- that name resolution is not repeated.
550 -- Three kinds of source nodes have associated nodes:
552 -- a) those that can reference (denote) entities, that is identifiers,
553 -- character literals, expanded_names, operator symbols, operators,
554 -- and attribute reference nodes. These nodes have an Entity field
555 -- and are the set of nodes that are in N_Has_Entity.
557 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
559 -- c) selected components (N_Selected_Component)
561 -- For the first class, the associated node preserves the entity if it is
562 -- global. If the generic contains nested instantiations, the associated
563 -- node itself has been recopied, and a chain of them must be followed.
565 -- For aggregates, the associated node allows retrieval of the type, which
566 -- may otherwise not appear in the generic. The view of this type may be
567 -- different between generic and instantiation, and the full view can be
568 -- installed before the instantiation is analyzed. For aggregates of
569 -- type extensions, the same view exchange may have to be performed for
570 -- some of the ancestor types, if their view is private at the point of
573 -- Nodes that are selected components in the parse tree may be rewritten
574 -- as expanded names after resolution, and must be treated as potential
575 -- entity holders. which is why they also have an Associated_Node.
577 -- Nodes that do not come from source, such as freeze nodes, do not appear
578 -- in the generic tree, and need not have an associated node.
580 -- The associated node is stored in the Associated_Node field. Note that
581 -- this field overlaps Entity, which is fine, because the whole point is
582 -- that we don't need or want the normal Entity field in this situation.
584 procedure Move_Freeze_Nodes
588 -- Freeze nodes can be generated in the analysis of a generic unit, but
589 -- will not be seen by the back-end. It is necessary to move those nodes
590 -- to the enclosing scope if they freeze an outer entity. We place them
591 -- at the end of the enclosing generic package, which is semantically
594 procedure Pre_Analyze_Actuals (N : Node_Id);
595 -- Analyze actuals to perform name resolution. Full resolution is done
596 -- later, when the expected types are known, but names have to be captured
597 -- before installing parents of generics, that are not visible for the
598 -- actuals themselves.
600 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
601 -- Verify that an attribute that appears as the default for a formal
602 -- subprogram is a function or procedure with the correct profile.
604 -------------------------------------------
605 -- Data Structures for Generic Renamings --
606 -------------------------------------------
608 -- The map Generic_Renamings associates generic entities with their
609 -- corresponding actuals. Currently used to validate type instances.
610 -- It will eventually be used for all generic parameters to eliminate
611 -- the need for overload resolution in the instance.
613 type Assoc_Ptr is new Int;
615 Assoc_Null : constant Assoc_Ptr := -1;
620 Next_In_HTable : Assoc_Ptr;
623 package Generic_Renamings is new Table.Table
624 (Table_Component_Type => Assoc,
625 Table_Index_Type => Assoc_Ptr,
626 Table_Low_Bound => 0,
628 Table_Increment => 100,
629 Table_Name => "Generic_Renamings");
631 -- Variable to hold enclosing instantiation. When the environment is
632 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
634 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
636 -- Hash table for associations
638 HTable_Size : constant := 37;
639 type HTable_Range is range 0 .. HTable_Size - 1;
641 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
642 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
643 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
644 function Hash (F : Entity_Id) return HTable_Range;
646 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
647 Header_Num => HTable_Range,
649 Elmt_Ptr => Assoc_Ptr,
650 Null_Ptr => Assoc_Null,
651 Set_Next => Set_Next_Assoc,
654 Get_Key => Get_Gen_Id,
658 Exchanged_Views : Elist_Id;
659 -- This list holds the private views that have been exchanged during
660 -- instantiation to restore the visibility of the generic declaration.
661 -- (see comments above). After instantiation, the current visibility is
662 -- reestablished by means of a traversal of this list.
664 Hidden_Entities : Elist_Id;
665 -- This list holds the entities of the current scope that are removed
666 -- from immediate visibility when instantiating a child unit. Their
667 -- visibility is restored in Remove_Parent.
669 -- Because instantiations can be recursive, the following must be saved
670 -- on entry and restored on exit from an instantiation (spec or body).
671 -- This is done by the two procedures Save_Env and Restore_Env. For
672 -- package and subprogram instantiations (but not for the body instances)
673 -- the action of Save_Env is done in two steps: Init_Env is called before
674 -- Check_Generic_Child_Unit, because setting the parent instances requires
675 -- that the visibility data structures be properly initialized. Once the
676 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
678 type Instance_Env is record
679 Ada_Version : Ada_Version_Type;
680 Instantiated_Parent : Assoc;
681 Exchanged_Views : Elist_Id;
682 Hidden_Entities : Elist_Id;
683 Current_Sem_Unit : Unit_Number_Type;
686 package Instance_Envs is new Table.Table (
687 Table_Component_Type => Instance_Env,
688 Table_Index_Type => Int,
689 Table_Low_Bound => 0,
691 Table_Increment => 100,
692 Table_Name => "Instance_Envs");
694 procedure Restore_Private_Views
695 (Pack_Id : Entity_Id;
696 Is_Package : Boolean := True);
697 -- Restore the private views of external types, and unmark the generic
698 -- renamings of actuals, so that they become comptible subtypes again.
699 -- For subprograms, Pack_Id is the package constructed to hold the
702 procedure Switch_View (T : Entity_Id);
703 -- Switch the partial and full views of a type and its private
704 -- dependents (i.e. its subtypes and derived types).
706 ------------------------------------
707 -- Structures for Error Reporting --
708 ------------------------------------
710 Instantiation_Node : Node_Id;
711 -- Used by subprograms that validate instantiation of formal parameters
712 -- where there might be no actual on which to place the error message.
713 -- Also used to locate the instantiation node for generic subunits.
715 Instantiation_Error : exception;
716 -- When there is a semantic error in the generic parameter matching,
717 -- there is no point in continuing the instantiation, because the
718 -- number of cascaded errors is unpredictable. This exception aborts
719 -- the instantiation process altogether.
721 S_Adjustment : Sloc_Adjustment;
722 -- Offset created for each node in an instantiation, in order to keep
723 -- track of the source position of the instantiation in each of its nodes.
724 -- A subsequent semantic error or warning on a construct of the instance
725 -- points to both places: the original generic node, and the point of
726 -- instantiation. See Sinput and Sinput.L for additional details.
728 ------------------------------------------------------------
729 -- Data structure for keeping track when inside a Generic --
730 ------------------------------------------------------------
732 -- The following table is used to save values of the Inside_A_Generic
733 -- flag (see spec of Sem) when they are saved by Start_Generic.
735 package Generic_Flags is new Table.Table (
736 Table_Component_Type => Boolean,
737 Table_Index_Type => Int,
738 Table_Low_Bound => 0,
740 Table_Increment => 200,
741 Table_Name => "Generic_Flags");
743 ---------------------------
744 -- Abandon_Instantiation --
745 ---------------------------
747 procedure Abandon_Instantiation (N : Node_Id) is
749 Error_Msg_N ("instantiation abandoned!", N);
750 raise Instantiation_Error;
751 end Abandon_Instantiation;
753 --------------------------
754 -- Analyze_Associations --
755 --------------------------
757 function Analyze_Associations
760 F_Copy : List_Id) return List_Id
762 Actual_Types : constant Elist_Id := New_Elmt_List;
763 Assoc : constant List_Id := New_List;
764 Defaults : constant Elist_Id := New_Elmt_List;
765 Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy));
769 Next_Formal : Node_Id;
770 Temp_Formal : Node_Id;
771 Analyzed_Formal : Node_Id;
774 First_Named : Node_Id := Empty;
775 Found_Assoc : Node_Id;
776 Is_Named_Assoc : Boolean;
777 Num_Matched : Int := 0;
778 Num_Actuals : Int := 0;
780 function Matching_Actual
782 A_F : Entity_Id) return Node_Id;
783 -- Find actual that corresponds to a given a formal parameter. If the
784 -- actuals are positional, return the next one, if any. If the actuals
785 -- are named, scan the parameter associations to find the right one.
786 -- A_F is the corresponding entity in the analyzed generic,which is
787 -- placed on the selector name for ASIS use.
789 procedure Set_Analyzed_Formal;
790 -- Find the node in the generic copy that corresponds to a given formal.
791 -- The semantic information on this node is used to perform legality
792 -- checks on the actuals. Because semantic analysis can introduce some
793 -- anonymous entities or modify the declaration node itself, the
794 -- correspondence between the two lists is not one-one. In addition to
795 -- anonymous types, the presence a formal equality will introduce an
796 -- implicit declaration for the corresponding inequality.
798 ---------------------
799 -- Matching_Actual --
800 ---------------------
802 function Matching_Actual
804 A_F : Entity_Id) return Node_Id
810 Is_Named_Assoc := False;
812 -- End of list of purely positional parameters
817 -- Case of positional parameter corresponding to current formal
819 elsif No (Selector_Name (Actual)) then
820 Found := Explicit_Generic_Actual_Parameter (Actual);
821 Found_Assoc := Actual;
822 Num_Matched := Num_Matched + 1;
825 -- Otherwise scan list of named actuals to find the one with the
826 -- desired name. All remaining actuals have explicit names.
829 Is_Named_Assoc := True;
833 while Present (Actual) loop
834 if Chars (Selector_Name (Actual)) = Chars (F) then
835 Found := Explicit_Generic_Actual_Parameter (Actual);
836 Set_Entity (Selector_Name (Actual), A_F);
837 Set_Etype (Selector_Name (Actual), Etype (A_F));
838 Generate_Reference (A_F, Selector_Name (Actual));
839 Found_Assoc := Actual;
840 Num_Matched := Num_Matched + 1;
848 -- Reset for subsequent searches. In most cases the named
849 -- associations are in order. If they are not, we reorder them
850 -- to avoid scanning twice the same actual. This is not just a
851 -- question of efficiency: there may be multiple defaults with
852 -- boxes that have the same name. In a nested instantiation we
853 -- insert actuals for those defaults, and cannot rely on their
854 -- names to disambiguate them.
856 if Actual = First_Named then
859 elsif Present (Actual) then
860 Insert_Before (First_Named, Remove_Next (Prev));
863 Actual := First_Named;
869 -------------------------
870 -- Set_Analyzed_Formal --
871 -------------------------
873 procedure Set_Analyzed_Formal is
876 while Present (Analyzed_Formal) loop
877 Kind := Nkind (Analyzed_Formal);
879 case Nkind (Formal) is
881 when N_Formal_Subprogram_Declaration =>
882 exit when Kind = N_Formal_Subprogram_Declaration
885 (Defining_Unit_Name (Specification (Formal))) =
887 (Defining_Unit_Name (Specification (Analyzed_Formal)));
889 when N_Formal_Package_Declaration =>
891 Kind = N_Formal_Package_Declaration
893 Kind = N_Generic_Package_Declaration;
895 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
899 -- Skip freeze nodes, and nodes inserted to replace
900 -- unrecognized pragmas.
903 Kind /= N_Formal_Subprogram_Declaration
904 and then Kind /= N_Subprogram_Declaration
905 and then Kind /= N_Freeze_Entity
906 and then Kind /= N_Null_Statement
907 and then Kind /= N_Itype_Reference
908 and then Chars (Defining_Identifier (Formal)) =
909 Chars (Defining_Identifier (Analyzed_Formal));
912 Next (Analyzed_Formal);
915 end Set_Analyzed_Formal;
917 -- Start of processing for Analyze_Associations
920 -- If named associations are present, save the first named association
921 -- (it may of course be Empty) to facilitate subsequent name search.
923 Actuals := Generic_Associations (I_Node);
925 if Present (Actuals) then
926 First_Named := First (Actuals);
928 while Present (First_Named)
929 and then No (Selector_Name (First_Named))
931 Num_Actuals := Num_Actuals + 1;
936 Named := First_Named;
937 while Present (Named) loop
938 if No (Selector_Name (Named)) then
939 Error_Msg_N ("invalid positional actual after named one", Named);
940 Abandon_Instantiation (Named);
943 -- A named association may lack an actual parameter, if it was
944 -- introduced for a default subprogram that turns out to be local
945 -- to the outer instantiation.
947 if Present (Explicit_Generic_Actual_Parameter (Named)) then
948 Num_Actuals := Num_Actuals + 1;
954 if Present (Formals) then
955 Formal := First_Non_Pragma (Formals);
956 Analyzed_Formal := First_Non_Pragma (F_Copy);
958 if Present (Actuals) then
959 Actual := First (Actuals);
961 -- All formals should have default values
967 while Present (Formal) loop
969 Next_Formal := Next_Non_Pragma (Formal);
971 case Nkind (Formal) is
972 when N_Formal_Object_Declaration =>
975 Defining_Identifier (Formal),
976 Defining_Identifier (Analyzed_Formal));
979 (Instantiate_Object (Formal, Match, Analyzed_Formal),
982 when N_Formal_Type_Declaration =>
985 Defining_Identifier (Formal),
986 Defining_Identifier (Analyzed_Formal));
989 Error_Msg_Sloc := Sloc (Gen_Unit);
992 Instantiation_Node, Defining_Identifier (Formal));
993 Error_Msg_NE ("\in instantiation of & declared#",
994 Instantiation_Node, Gen_Unit);
995 Abandon_Instantiation (Instantiation_Node);
1001 (Formal, Match, Analyzed_Formal, Assoc));
1003 -- an instantiation is a freeze point for the actuals,
1004 -- unless this is a rewritten formal package.
1006 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1007 Append_Elmt (Entity (Match), Actual_Types);
1011 -- A remote access-to-class-wide type must not be an
1012 -- actual parameter for a generic formal of an access
1013 -- type (E.2.2 (17)).
1015 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1017 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1018 N_Access_To_Object_Definition
1020 Validate_Remote_Access_To_Class_Wide_Type (Match);
1023 when N_Formal_Subprogram_Declaration =>
1026 Defining_Unit_Name (Specification (Formal)),
1027 Defining_Unit_Name (Specification (Analyzed_Formal)));
1029 -- If the formal subprogram has the same name as
1030 -- another formal subprogram of the generic, then
1031 -- a named association is illegal (12.3(9)). Exclude
1032 -- named associations that are generated for a nested
1036 and then Is_Named_Assoc
1037 and then Comes_From_Source (Found_Assoc)
1039 Temp_Formal := First (Formals);
1040 while Present (Temp_Formal) loop
1041 if Nkind (Temp_Formal) =
1042 N_Formal_Subprogram_Declaration
1043 and then Temp_Formal /= Formal
1045 Chars (Selector_Name (Found_Assoc)) =
1046 Chars (Defining_Unit_Name
1047 (Specification (Temp_Formal)))
1050 ("name not allowed for overloaded formal",
1052 Abandon_Instantiation (Instantiation_Node);
1060 Instantiate_Formal_Subprogram
1061 (Formal, Match, Analyzed_Formal));
1064 and then Box_Present (Formal)
1067 (Defining_Unit_Name (Specification (Last (Assoc))),
1071 when N_Formal_Package_Declaration =>
1074 Defining_Identifier (Formal),
1075 Defining_Identifier (Original_Node (Analyzed_Formal)));
1078 Error_Msg_Sloc := Sloc (Gen_Unit);
1081 Instantiation_Node, Defining_Identifier (Formal));
1082 Error_Msg_NE ("\in instantiation of & declared#",
1083 Instantiation_Node, Gen_Unit);
1085 Abandon_Instantiation (Instantiation_Node);
1090 (Instantiate_Formal_Package
1091 (Formal, Match, Analyzed_Formal),
1095 -- For use type and use package appearing in the context
1096 -- clause, we have already copied them, so we can just
1097 -- move them where they belong (we mustn't recopy them
1098 -- since this would mess up the Sloc values).
1100 when N_Use_Package_Clause |
1101 N_Use_Type_Clause =>
1103 Append (Formal, Assoc);
1106 raise Program_Error;
1110 Formal := Next_Formal;
1111 Next_Non_Pragma (Analyzed_Formal);
1114 if Num_Actuals > Num_Matched then
1115 Error_Msg_Sloc := Sloc (Gen_Unit);
1117 if Present (Selector_Name (Actual)) then
1119 ("unmatched actual&",
1120 Actual, Selector_Name (Actual));
1121 Error_Msg_NE ("\in instantiation of& declared#",
1125 ("unmatched actual in instantiation of& declared#",
1130 elsif Present (Actuals) then
1132 ("too many actuals in generic instantiation", Instantiation_Node);
1136 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1139 while Present (Elmt) loop
1140 Freeze_Before (I_Node, Node (Elmt));
1145 -- If there are default subprograms, normalize the tree by adding
1146 -- explicit associations for them. This is required if the instance
1147 -- appears within a generic.
1155 Elmt := First_Elmt (Defaults);
1156 while Present (Elmt) loop
1157 if No (Actuals) then
1158 Actuals := New_List;
1159 Set_Generic_Associations (I_Node, Actuals);
1162 Subp := Node (Elmt);
1164 Make_Generic_Association (Sloc (Subp),
1165 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1166 Explicit_Generic_Actual_Parameter =>
1167 New_Occurrence_Of (Subp, Sloc (Subp)));
1168 Mark_Rewrite_Insertion (New_D);
1169 Append_To (Actuals, New_D);
1175 end Analyze_Associations;
1177 -------------------------------
1178 -- Analyze_Formal_Array_Type --
1179 -------------------------------
1181 procedure Analyze_Formal_Array_Type
1182 (T : in out Entity_Id;
1188 -- Treated like a non-generic array declaration, with
1189 -- additional semantic checks.
1193 if Nkind (Def) = N_Constrained_Array_Definition then
1194 DSS := First (Discrete_Subtype_Definitions (Def));
1195 while Present (DSS) loop
1196 if Nkind (DSS) = N_Subtype_Indication
1197 or else Nkind (DSS) = N_Range
1198 or else Nkind (DSS) = N_Attribute_Reference
1200 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1207 Array_Type_Declaration (T, Def);
1208 Set_Is_Generic_Type (Base_Type (T));
1210 if Ekind (Component_Type (T)) = E_Incomplete_Type
1211 and then No (Full_View (Component_Type (T)))
1213 Error_Msg_N ("premature usage of incomplete type", Def);
1215 -- Check that range constraint is not allowed on the component type
1216 -- of a generic formal array type (AARM 12.5.3(3))
1218 elsif Is_Internal (Component_Type (T))
1219 and then Present (Subtype_Indication (Component_Definition (Def)))
1220 and then Nkind (Original_Node
1221 (Subtype_Indication (Component_Definition (Def))))
1222 = N_Subtype_Indication
1225 ("in a formal, a subtype indication can only be "
1226 & "a subtype mark ('R'M 12.5.3(3))",
1227 Subtype_Indication (Component_Definition (Def)));
1230 end Analyze_Formal_Array_Type;
1232 ---------------------------------------------
1233 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1234 ---------------------------------------------
1236 -- As for other generic types, we create a valid type representation
1237 -- with legal but arbitrary attributes, whose values are never considered
1238 -- static. For all scalar types we introduce an anonymous base type, with
1239 -- the same attributes. We choose the corresponding integer type to be
1240 -- Standard_Integer.
1242 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1246 Loc : constant Source_Ptr := Sloc (Def);
1247 Base : constant Entity_Id :=
1249 (E_Decimal_Fixed_Point_Type,
1250 Current_Scope, Sloc (Def), 'G');
1251 Int_Base : constant Entity_Id := Standard_Integer;
1252 Delta_Val : constant Ureal := Ureal_1;
1253 Digs_Val : constant Uint := Uint_6;
1258 Set_Etype (Base, Base);
1259 Set_Size_Info (Base, Int_Base);
1260 Set_RM_Size (Base, RM_Size (Int_Base));
1261 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1262 Set_Digits_Value (Base, Digs_Val);
1263 Set_Delta_Value (Base, Delta_Val);
1264 Set_Small_Value (Base, Delta_Val);
1265 Set_Scalar_Range (Base,
1267 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1268 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1270 Set_Is_Generic_Type (Base);
1271 Set_Parent (Base, Parent (Def));
1273 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1274 Set_Etype (T, Base);
1275 Set_Size_Info (T, Int_Base);
1276 Set_RM_Size (T, RM_Size (Int_Base));
1277 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1278 Set_Digits_Value (T, Digs_Val);
1279 Set_Delta_Value (T, Delta_Val);
1280 Set_Small_Value (T, Delta_Val);
1281 Set_Scalar_Range (T, Scalar_Range (Base));
1283 Check_Restriction (No_Fixed_Point, Def);
1284 end Analyze_Formal_Decimal_Fixed_Point_Type;
1286 ---------------------------------
1287 -- Analyze_Formal_Derived_Type --
1288 ---------------------------------
1290 procedure Analyze_Formal_Derived_Type
1295 Loc : constant Source_Ptr := Sloc (Def);
1296 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1300 Set_Is_Generic_Type (T);
1302 if Private_Present (Def) then
1304 Make_Private_Extension_Declaration (Loc,
1305 Defining_Identifier => T,
1306 Discriminant_Specifications => Discriminant_Specifications (N),
1307 Unknown_Discriminants_Present => Unk_Disc,
1308 Subtype_Indication => Subtype_Mark (Def));
1310 Set_Abstract_Present (New_N, Abstract_Present (Def));
1314 Make_Full_Type_Declaration (Loc,
1315 Defining_Identifier => T,
1316 Discriminant_Specifications =>
1317 Discriminant_Specifications (Parent (T)),
1319 Make_Derived_Type_Definition (Loc,
1320 Subtype_Indication => Subtype_Mark (Def)));
1322 Set_Abstract_Present
1323 (Type_Definition (New_N), Abstract_Present (Def));
1330 if not Is_Composite_Type (T) then
1332 ("unknown discriminants not allowed for elementary types", N);
1334 Set_Has_Unknown_Discriminants (T);
1335 Set_Is_Constrained (T, False);
1339 -- If the parent type has a known size, so does the formal, which
1340 -- makes legal representation clauses that involve the formal.
1342 Set_Size_Known_At_Compile_Time
1343 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1345 end Analyze_Formal_Derived_Type;
1347 ----------------------------------
1348 -- Analyze_Formal_Discrete_Type --
1349 ----------------------------------
1351 -- The operations defined for a discrete types are those of an
1352 -- enumeration type. The size is set to an arbitrary value, for use
1353 -- in analyzing the generic unit.
1355 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1356 Loc : constant Source_Ptr := Sloc (Def);
1362 Set_Ekind (T, E_Enumeration_Type);
1367 -- For semantic analysis, the bounds of the type must be set to some
1368 -- non-static value. The simplest is to create attribute nodes for
1369 -- those bounds, that refer to the type itself. These bounds are never
1370 -- analyzed but serve as place-holders.
1373 Make_Attribute_Reference (Loc,
1374 Attribute_Name => Name_First,
1375 Prefix => New_Reference_To (T, Loc));
1379 Make_Attribute_Reference (Loc,
1380 Attribute_Name => Name_Last,
1381 Prefix => New_Reference_To (T, Loc));
1384 Set_Scalar_Range (T,
1389 end Analyze_Formal_Discrete_Type;
1391 ----------------------------------
1392 -- Analyze_Formal_Floating_Type --
1393 ---------------------------------
1395 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1396 Base : constant Entity_Id :=
1398 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1401 -- The various semantic attributes are taken from the predefined type
1402 -- Float, just so that all of them are initialized. Their values are
1403 -- never used because no constant folding or expansion takes place in
1404 -- the generic itself.
1407 Set_Ekind (T, E_Floating_Point_Subtype);
1408 Set_Etype (T, Base);
1409 Set_Size_Info (T, (Standard_Float));
1410 Set_RM_Size (T, RM_Size (Standard_Float));
1411 Set_Digits_Value (T, Digits_Value (Standard_Float));
1412 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1414 Set_Is_Generic_Type (Base);
1415 Set_Etype (Base, Base);
1416 Set_Size_Info (Base, (Standard_Float));
1417 Set_RM_Size (Base, RM_Size (Standard_Float));
1418 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1419 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1420 Set_Parent (Base, Parent (Def));
1422 Check_Restriction (No_Floating_Point, Def);
1423 end Analyze_Formal_Floating_Type;
1425 ---------------------------------
1426 -- Analyze_Formal_Modular_Type --
1427 ---------------------------------
1429 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1431 -- Apart from their entity kind, generic modular types are treated
1432 -- like signed integer types, and have the same attributes.
1434 Analyze_Formal_Signed_Integer_Type (T, Def);
1435 Set_Ekind (T, E_Modular_Integer_Subtype);
1436 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1438 end Analyze_Formal_Modular_Type;
1440 ---------------------------------------
1441 -- Analyze_Formal_Object_Declaration --
1442 ---------------------------------------
1444 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1445 E : constant Node_Id := Expression (N);
1446 Id : constant Node_Id := Defining_Identifier (N);
1453 -- Determine the mode of the formal object
1455 if Out_Present (N) then
1456 K := E_Generic_In_Out_Parameter;
1458 if not In_Present (N) then
1459 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1463 K := E_Generic_In_Parameter;
1466 Find_Type (Subtype_Mark (N));
1467 T := Entity (Subtype_Mark (N));
1469 if Ekind (T) = E_Incomplete_Type then
1470 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1473 if K = E_Generic_In_Parameter then
1475 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1477 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1479 ("generic formal of mode IN must not be of limited type", N);
1480 Explain_Limited_Type (T, N);
1483 if Is_Abstract (T) then
1485 ("generic formal of mode IN must not be of abstract type", N);
1489 Analyze_Per_Use_Expression (E, T);
1495 -- Case of generic IN OUT parameter.
1498 -- If the formal has an unconstrained type, construct its
1499 -- actual subtype, as is done for subprogram formals. In this
1500 -- fashion, all its uses can refer to specific bounds.
1505 if (Is_Array_Type (T)
1506 and then not Is_Constrained (T))
1508 (Ekind (T) = E_Record_Type
1509 and then Has_Discriminants (T))
1512 Non_Freezing_Ref : constant Node_Id :=
1513 New_Reference_To (Id, Sloc (Id));
1517 -- Make sure that the actual subtype doesn't generate
1520 Set_Must_Not_Freeze (Non_Freezing_Ref);
1521 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1522 Insert_Before_And_Analyze (N, Decl);
1523 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1526 Set_Actual_Subtype (Id, T);
1531 ("initialization not allowed for `IN OUT` formals", N);
1535 end Analyze_Formal_Object_Declaration;
1537 ----------------------------------------------
1538 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1539 ----------------------------------------------
1541 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1545 Loc : constant Source_Ptr := Sloc (Def);
1546 Base : constant Entity_Id :=
1548 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1550 -- The semantic attributes are set for completeness only, their
1551 -- values will never be used, because all properties of the type
1555 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1556 Set_Etype (T, Base);
1557 Set_Size_Info (T, Standard_Integer);
1558 Set_RM_Size (T, RM_Size (Standard_Integer));
1559 Set_Small_Value (T, Ureal_1);
1560 Set_Delta_Value (T, Ureal_1);
1561 Set_Scalar_Range (T,
1563 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1564 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1566 Set_Is_Generic_Type (Base);
1567 Set_Etype (Base, Base);
1568 Set_Size_Info (Base, Standard_Integer);
1569 Set_RM_Size (Base, RM_Size (Standard_Integer));
1570 Set_Small_Value (Base, Ureal_1);
1571 Set_Delta_Value (Base, Ureal_1);
1572 Set_Scalar_Range (Base, Scalar_Range (T));
1573 Set_Parent (Base, Parent (Def));
1575 Check_Restriction (No_Fixed_Point, Def);
1576 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1578 ----------------------------
1579 -- Analyze_Formal_Package --
1580 ----------------------------
1582 procedure Analyze_Formal_Package (N : Node_Id) is
1583 Loc : constant Source_Ptr := Sloc (N);
1584 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1586 Gen_Id : constant Node_Id := Name (N);
1588 Gen_Unit : Entity_Id;
1590 Parent_Installed : Boolean := False;
1592 Parent_Instance : Entity_Id;
1593 Renaming_In_Par : Entity_Id;
1596 Text_IO_Kludge (Gen_Id);
1599 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1600 Gen_Unit := Entity (Gen_Id);
1602 if Ekind (Gen_Unit) /= E_Generic_Package then
1603 Error_Msg_N ("expect generic package name", Gen_Id);
1607 elsif Gen_Unit = Current_Scope then
1609 ("generic package cannot be used as a formal package of itself",
1614 elsif In_Open_Scopes (Gen_Unit) then
1615 if Is_Compilation_Unit (Gen_Unit)
1616 and then Is_Child_Unit (Current_Scope)
1618 -- Special-case the error when the formal is a parent, and
1619 -- continue analysis to minimize cascaded errors.
1622 ("generic parent cannot be used as formal package "
1623 & "of a child unit",
1628 ("generic package cannot be used as a formal package "
1636 -- Check for a formal package that is a package renaming.
1638 if Present (Renamed_Object (Gen_Unit)) then
1639 Gen_Unit := Renamed_Object (Gen_Unit);
1642 -- The formal package is treated like a regular instance, but only
1643 -- the specification needs to be instantiated, to make entities visible.
1645 if not Box_Present (N) then
1646 Hidden_Entities := New_Elmt_List;
1647 Analyze_Package_Instantiation (N);
1649 if Parent_Installed then
1654 -- If there are no generic associations, the generic parameters
1655 -- appear as local entities and are instantiated like them. We copy
1656 -- the generic package declaration as if it were an instantiation,
1657 -- and analyze it like a regular package, except that we treat the
1658 -- formals as additional visible components.
1660 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1662 if In_Extended_Main_Source_Unit (N) then
1663 Set_Is_Instantiated (Gen_Unit);
1664 Generate_Reference (Gen_Unit, N);
1667 Formal := New_Copy (Pack_Id);
1670 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1672 Set_Defining_Unit_Name (Specification (New_N), Formal);
1673 Set_Instance_Env (Gen_Unit, Formal);
1675 Enter_Name (Formal);
1676 Set_Ekind (Formal, E_Generic_Package);
1677 Set_Etype (Formal, Standard_Void_Type);
1678 Set_Inner_Instances (Formal, New_Elmt_List);
1681 -- Within the formal, the name of the generic package is a renaming
1682 -- of the formal (as for a regular instantiation).
1684 Renaming := Make_Package_Renaming_Declaration (Loc,
1685 Defining_Unit_Name =>
1686 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1687 Name => New_Reference_To (Formal, Loc));
1689 if Present (Visible_Declarations (Specification (N))) then
1690 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1691 elsif Present (Private_Declarations (Specification (N))) then
1692 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1695 if Is_Child_Unit (Gen_Unit)
1696 and then Parent_Installed
1698 -- Similarly, we have to make the name of the formal visible in
1699 -- the parent instance, to resolve properly fully qualified names
1700 -- that may appear in the generic unit. The parent instance has
1701 -- been placed on the scope stack ahead of the current scope.
1703 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1706 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1707 Set_Ekind (Renaming_In_Par, E_Package);
1708 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1709 Set_Scope (Renaming_In_Par, Parent_Instance);
1710 Set_Parent (Renaming_In_Par, Parent (Formal));
1711 Set_Renamed_Object (Renaming_In_Par, Formal);
1712 Append_Entity (Renaming_In_Par, Parent_Instance);
1715 Analyze_Generic_Formal_Part (N);
1716 Analyze (Specification (N));
1717 End_Package_Scope (Formal);
1719 if Parent_Installed then
1725 -- Inside the generic unit, the formal package is a regular
1726 -- package, but no body is needed for it. Note that after
1727 -- instantiation, the defining_unit_name we need is in the
1728 -- new tree and not in the original. (see Package_Instantiation).
1729 -- A generic formal package is an instance, and can be used as
1730 -- an actual for an inner instance. Mark its generic parent.
1732 Set_Ekind (Formal, E_Package);
1733 Set_Generic_Parent (Specification (N), Gen_Unit);
1734 Set_Has_Completion (Formal, True);
1736 Set_Ekind (Pack_Id, E_Package);
1737 Set_Etype (Pack_Id, Standard_Void_Type);
1738 Set_Scope (Pack_Id, Scope (Formal));
1739 Set_Has_Completion (Pack_Id, True);
1741 end Analyze_Formal_Package;
1743 ---------------------------------
1744 -- Analyze_Formal_Private_Type --
1745 ---------------------------------
1747 procedure Analyze_Formal_Private_Type
1753 New_Private_Type (N, T, Def);
1755 -- Set the size to an arbitrary but legal value.
1757 Set_Size_Info (T, Standard_Integer);
1758 Set_RM_Size (T, RM_Size (Standard_Integer));
1759 end Analyze_Formal_Private_Type;
1761 ----------------------------------------
1762 -- Analyze_Formal_Signed_Integer_Type --
1763 ----------------------------------------
1765 procedure Analyze_Formal_Signed_Integer_Type
1769 Base : constant Entity_Id :=
1771 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1776 Set_Ekind (T, E_Signed_Integer_Subtype);
1777 Set_Etype (T, Base);
1778 Set_Size_Info (T, Standard_Integer);
1779 Set_RM_Size (T, RM_Size (Standard_Integer));
1780 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1782 Set_Is_Generic_Type (Base);
1783 Set_Size_Info (Base, Standard_Integer);
1784 Set_RM_Size (Base, RM_Size (Standard_Integer));
1785 Set_Etype (Base, Base);
1786 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1787 Set_Parent (Base, Parent (Def));
1788 end Analyze_Formal_Signed_Integer_Type;
1790 -------------------------------
1791 -- Analyze_Formal_Subprogram --
1792 -------------------------------
1794 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1795 Spec : constant Node_Id := Specification (N);
1796 Def : constant Node_Id := Default_Name (N);
1797 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1805 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1806 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1810 Analyze_Subprogram_Declaration (N);
1811 Set_Is_Formal_Subprogram (Nam);
1812 Set_Has_Completion (Nam);
1814 -- Default name is resolved at the point of instantiation
1816 if Box_Present (N) then
1819 -- Else default is bound at the point of generic declaration
1821 elsif Present (Def) then
1822 if Nkind (Def) = N_Operator_Symbol then
1823 Find_Direct_Name (Def);
1825 elsif Nkind (Def) /= N_Attribute_Reference then
1829 -- For an attribute reference, analyze the prefix and verify
1830 -- that it has the proper profile for the subprogram.
1832 Analyze (Prefix (Def));
1833 Valid_Default_Attribute (Nam, Def);
1837 -- Default name may be overloaded, in which case the interpretation
1838 -- with the correct profile must be selected, as for a renaming.
1840 if Etype (Def) = Any_Type then
1843 elsif Nkind (Def) = N_Selected_Component then
1844 Subp := Entity (Selector_Name (Def));
1846 if Ekind (Subp) /= E_Entry then
1847 Error_Msg_N ("expect valid subprogram name as default", Def);
1851 elsif Nkind (Def) = N_Indexed_Component then
1853 if Nkind (Prefix (Def)) /= N_Selected_Component then
1854 Error_Msg_N ("expect valid subprogram name as default", Def);
1858 Subp := Entity (Selector_Name (Prefix (Def)));
1860 if Ekind (Subp) /= E_Entry_Family then
1861 Error_Msg_N ("expect valid subprogram name as default", Def);
1866 elsif Nkind (Def) = N_Character_Literal then
1868 -- Needs some type checks: subprogram should be parameterless???
1870 Resolve (Def, (Etype (Nam)));
1872 elsif not Is_Entity_Name (Def)
1873 or else not Is_Overloadable (Entity (Def))
1875 Error_Msg_N ("expect valid subprogram name as default", Def);
1878 elsif not Is_Overloaded (Def) then
1879 Subp := Entity (Def);
1882 Error_Msg_N ("premature usage of formal subprogram", Def);
1884 elsif not Entity_Matches_Spec (Subp, Nam) then
1885 Error_Msg_N ("no visible entity matches specification", Def);
1891 I1 : Interp_Index := 0;
1897 Get_First_Interp (Def, I, It);
1898 while Present (It.Nam) loop
1900 if Entity_Matches_Spec (It.Nam, Nam) then
1901 if Subp /= Any_Id then
1902 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1904 if It1 = No_Interp then
1905 Error_Msg_N ("ambiguous default subprogram", Def);
1918 Get_Next_Interp (I, It);
1922 if Subp /= Any_Id then
1923 Set_Entity (Def, Subp);
1926 Error_Msg_N ("premature usage of formal subprogram", Def);
1928 elsif Ekind (Subp) /= E_Operator then
1929 Check_Mode_Conformant (Subp, Nam);
1933 Error_Msg_N ("no visible subprogram matches specification", N);
1937 end Analyze_Formal_Subprogram;
1939 -------------------------------------
1940 -- Analyze_Formal_Type_Declaration --
1941 -------------------------------------
1943 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1944 Def : constant Node_Id := Formal_Type_Definition (N);
1948 T := Defining_Identifier (N);
1950 if Present (Discriminant_Specifications (N))
1951 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1954 ("discriminants not allowed for this formal type",
1955 Defining_Identifier (First (Discriminant_Specifications (N))));
1958 -- Enter the new name, and branch to specific routine.
1961 when N_Formal_Private_Type_Definition =>
1962 Analyze_Formal_Private_Type (N, T, Def);
1964 when N_Formal_Derived_Type_Definition =>
1965 Analyze_Formal_Derived_Type (N, T, Def);
1967 when N_Formal_Discrete_Type_Definition =>
1968 Analyze_Formal_Discrete_Type (T, Def);
1970 when N_Formal_Signed_Integer_Type_Definition =>
1971 Analyze_Formal_Signed_Integer_Type (T, Def);
1973 when N_Formal_Modular_Type_Definition =>
1974 Analyze_Formal_Modular_Type (T, Def);
1976 when N_Formal_Floating_Point_Definition =>
1977 Analyze_Formal_Floating_Type (T, Def);
1979 when N_Formal_Ordinary_Fixed_Point_Definition =>
1980 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
1982 when N_Formal_Decimal_Fixed_Point_Definition =>
1983 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
1985 when N_Array_Type_Definition =>
1986 Analyze_Formal_Array_Type (T, Def);
1988 when N_Access_To_Object_Definition |
1989 N_Access_Function_Definition |
1990 N_Access_Procedure_Definition =>
1991 Analyze_Generic_Access_Type (T, Def);
1997 raise Program_Error;
2001 Set_Is_Generic_Type (T);
2002 end Analyze_Formal_Type_Declaration;
2004 ------------------------------------
2005 -- Analyze_Function_Instantiation --
2006 ------------------------------------
2008 procedure Analyze_Function_Instantiation (N : Node_Id) is
2010 Analyze_Subprogram_Instantiation (N, E_Function);
2011 end Analyze_Function_Instantiation;
2013 ---------------------------------
2014 -- Analyze_Generic_Access_Type --
2015 ---------------------------------
2017 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2021 if Nkind (Def) = N_Access_To_Object_Definition then
2022 Access_Type_Declaration (T, Def);
2024 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2025 and then No (Full_View (Designated_Type (T)))
2026 and then not Is_Generic_Type (Designated_Type (T))
2028 Error_Msg_N ("premature usage of incomplete type", Def);
2030 elsif Is_Internal (Designated_Type (T)) then
2032 ("only a subtype mark is allowed in a formal", Def);
2036 Access_Subprogram_Declaration (T, Def);
2038 end Analyze_Generic_Access_Type;
2040 ---------------------------------
2041 -- Analyze_Generic_Formal_Part --
2042 ---------------------------------
2044 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2045 Gen_Parm_Decl : Node_Id;
2048 -- The generic formals are processed in the scope of the generic
2049 -- unit, where they are immediately visible. The scope is installed
2052 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2054 while Present (Gen_Parm_Decl) loop
2055 Analyze (Gen_Parm_Decl);
2056 Next (Gen_Parm_Decl);
2059 Generate_Reference_To_Generic_Formals (Current_Scope);
2060 end Analyze_Generic_Formal_Part;
2062 ------------------------------------------
2063 -- Analyze_Generic_Package_Declaration --
2064 ------------------------------------------
2066 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2067 Loc : constant Source_Ptr := Sloc (N);
2070 Save_Parent : Node_Id;
2072 Decls : constant List_Id :=
2073 Visible_Declarations (Specification (N));
2077 -- We introduce a renaming of the enclosing package, to have a usable
2078 -- entity as the prefix of an expanded name for a local entity of the
2079 -- form Par.P.Q, where P is the generic package. This is because a local
2080 -- entity named P may hide it, so that the usual visibility rules in
2081 -- the instance will not resolve properly.
2084 Make_Package_Renaming_Declaration (Loc,
2085 Defining_Unit_Name =>
2086 Make_Defining_Identifier (Loc,
2087 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2088 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2090 if Present (Decls) then
2091 Decl := First (Decls);
2092 while Present (Decl)
2093 and then Nkind (Decl) = N_Pragma
2098 if Present (Decl) then
2099 Insert_Before (Decl, Renaming);
2101 Append (Renaming, Visible_Declarations (Specification (N)));
2105 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2108 -- Create copy of generic unit, and save for instantiation.
2109 -- If the unit is a child unit, do not copy the specifications
2110 -- for the parent, which are not part of the generic tree.
2112 Save_Parent := Parent_Spec (N);
2113 Set_Parent_Spec (N, Empty);
2115 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2116 Set_Parent_Spec (New_N, Save_Parent);
2118 Id := Defining_Entity (N);
2119 Generate_Definition (Id);
2121 -- Expansion is not applied to generic units.
2126 Set_Ekind (Id, E_Generic_Package);
2127 Set_Etype (Id, Standard_Void_Type);
2129 Enter_Generic_Scope (Id);
2130 Set_Inner_Instances (Id, New_Elmt_List);
2132 Set_Categorization_From_Pragmas (N);
2133 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2135 -- Link the declaration of the generic homonym in the generic copy
2136 -- to the package it renames, so that it is always resolved properly.
2138 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2139 Set_Entity (Associated_Node (Name (Renaming)), Id);
2141 -- For a library unit, we have reconstructed the entity for the
2142 -- unit, and must reset it in the library tables.
2144 if Nkind (Parent (N)) = N_Compilation_Unit then
2145 Set_Cunit_Entity (Current_Sem_Unit, Id);
2148 Analyze_Generic_Formal_Part (N);
2150 -- After processing the generic formals, analysis proceeds
2151 -- as for a non-generic package.
2153 Analyze (Specification (N));
2155 Validate_Categorization_Dependency (N, Id);
2159 End_Package_Scope (Id);
2160 Exit_Generic_Scope (Id);
2162 if Nkind (Parent (N)) /= N_Compilation_Unit then
2163 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2164 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2165 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2168 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2169 Validate_RT_RAT_Component (N);
2171 -- If this is a spec without a body, check that generic parameters
2174 if not Body_Required (Parent (N)) then
2175 Check_References (Id);
2178 end Analyze_Generic_Package_Declaration;
2180 --------------------------------------------
2181 -- Analyze_Generic_Subprogram_Declaration --
2182 --------------------------------------------
2184 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2189 Save_Parent : Node_Id;
2192 -- Create copy of generic unit,and save for instantiation.
2193 -- If the unit is a child unit, do not copy the specifications
2194 -- for the parent, which are not part of the generic tree.
2196 Save_Parent := Parent_Spec (N);
2197 Set_Parent_Spec (N, Empty);
2199 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2200 Set_Parent_Spec (New_N, Save_Parent);
2203 Spec := Specification (N);
2204 Id := Defining_Entity (Spec);
2205 Generate_Definition (Id);
2207 if Nkind (Id) = N_Defining_Operator_Symbol then
2209 ("operator symbol not allowed for generic subprogram", Id);
2216 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2218 Enter_Generic_Scope (Id);
2219 Set_Inner_Instances (Id, New_Elmt_List);
2220 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2222 Analyze_Generic_Formal_Part (N);
2224 Formals := Parameter_Specifications (Spec);
2226 if Present (Formals) then
2227 Process_Formals (Formals, Spec);
2230 if Nkind (Spec) = N_Function_Specification then
2231 Set_Ekind (Id, E_Generic_Function);
2232 Find_Type (Subtype_Mark (Spec));
2233 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2235 Set_Ekind (Id, E_Generic_Procedure);
2236 Set_Etype (Id, Standard_Void_Type);
2239 -- For a library unit, we have reconstructed the entity for the
2240 -- unit, and must reset it in the library tables. We also need
2241 -- to make sure that Body_Required is set properly in the original
2242 -- compilation unit node.
2244 if Nkind (Parent (N)) = N_Compilation_Unit then
2245 Set_Cunit_Entity (Current_Sem_Unit, Id);
2246 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2249 Set_Categorization_From_Pragmas (N);
2250 Validate_Categorization_Dependency (N, Id);
2252 Save_Global_References (Original_Node (N));
2256 Exit_Generic_Scope (Id);
2257 Generate_Reference_To_Formals (Id);
2258 end Analyze_Generic_Subprogram_Declaration;
2260 -----------------------------------
2261 -- Analyze_Package_Instantiation --
2262 -----------------------------------
2264 -- Note: this procedure is also used for formal package declarations,
2265 -- in which case the argument N is an N_Formal_Package_Declaration
2266 -- node. This should really be noted in the spec! ???
2268 procedure Analyze_Package_Instantiation (N : Node_Id) is
2269 Loc : constant Source_Ptr := Sloc (N);
2270 Gen_Id : constant Node_Id := Name (N);
2273 Act_Decl_Name : Node_Id;
2274 Act_Decl_Id : Entity_Id;
2279 Gen_Unit : Entity_Id;
2281 Is_Actual_Pack : constant Boolean :=
2282 Is_Internal (Defining_Entity (N));
2284 Parent_Installed : Boolean := False;
2285 Renaming_List : List_Id;
2286 Unit_Renaming : Node_Id;
2287 Needs_Body : Boolean;
2288 Inline_Now : Boolean := False;
2290 procedure Delay_Descriptors (E : Entity_Id);
2291 -- Delay generation of subprogram descriptors for given entity
2293 function Might_Inline_Subp return Boolean;
2294 -- If inlining is active and the generic contains inlined subprograms,
2295 -- we instantiate the body. This may cause superfluous instantiations,
2296 -- but it is simpler than detecting the need for the body at the point
2297 -- of inlining, when the context of the instance is not available.
2299 -----------------------
2300 -- Delay_Descriptors --
2301 -----------------------
2303 procedure Delay_Descriptors (E : Entity_Id) is
2305 if not Delay_Subprogram_Descriptors (E) then
2306 Set_Delay_Subprogram_Descriptors (E);
2307 Pending_Descriptor.Increment_Last;
2308 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2310 end Delay_Descriptors;
2312 -----------------------
2313 -- Might_Inline_Subp --
2314 -----------------------
2316 function Might_Inline_Subp return Boolean is
2320 if not Inline_Processing_Required then
2324 E := First_Entity (Gen_Unit);
2325 while Present (E) loop
2326 if Is_Subprogram (E)
2327 and then Is_Inlined (E)
2337 end Might_Inline_Subp;
2339 -- Start of processing for Analyze_Package_Instantiation
2342 -- Very first thing: apply the special kludge for Text_IO processing
2343 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2345 Text_IO_Kludge (Name (N));
2347 -- Make node global for error reporting.
2349 Instantiation_Node := N;
2351 -- Case of instantiation of a generic package
2353 if Nkind (N) = N_Package_Instantiation then
2354 Act_Decl_Id := New_Copy (Defining_Entity (N));
2355 Set_Comes_From_Source (Act_Decl_Id, True);
2357 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2359 Make_Defining_Program_Unit_Name (Loc,
2360 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2361 Defining_Identifier => Act_Decl_Id);
2363 Act_Decl_Name := Act_Decl_Id;
2366 -- Case of instantiation of a formal package
2369 Act_Decl_Id := Defining_Identifier (N);
2370 Act_Decl_Name := Act_Decl_Id;
2373 Generate_Definition (Act_Decl_Id);
2374 Pre_Analyze_Actuals (N);
2377 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2378 Gen_Unit := Entity (Gen_Id);
2380 -- Verify that it is the name of a generic package
2382 if Etype (Gen_Unit) = Any_Type then
2386 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2388 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2390 if From_With_Type (Gen_Unit) then
2392 ("cannot instantiate a limited withed package", Gen_Id);
2395 ("expect name of generic package in instantiation", Gen_Id);
2402 if In_Extended_Main_Source_Unit (N) then
2403 Set_Is_Instantiated (Gen_Unit);
2404 Generate_Reference (Gen_Unit, N);
2406 if Present (Renamed_Object (Gen_Unit)) then
2407 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2408 Generate_Reference (Renamed_Object (Gen_Unit), N);
2412 if Nkind (Gen_Id) = N_Identifier
2413 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2416 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2418 elsif Nkind (Gen_Id) = N_Expanded_Name
2419 and then Is_Child_Unit (Gen_Unit)
2420 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2421 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2424 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2427 Set_Entity (Gen_Id, Gen_Unit);
2429 -- If generic is a renaming, get original generic unit.
2431 if Present (Renamed_Object (Gen_Unit))
2432 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2434 Gen_Unit := Renamed_Object (Gen_Unit);
2437 -- Verify that there are no circular instantiations.
2439 if In_Open_Scopes (Gen_Unit) then
2440 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2444 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2445 Error_Msg_Node_2 := Current_Scope;
2447 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2448 Circularity_Detected := True;
2453 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
2454 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2456 -- Initialize renamings map, for error checking, and the list
2457 -- that holds private entities whose views have changed between
2458 -- generic definition and instantiation. If this is the instance
2459 -- created to validate an actual package, the instantiation
2460 -- environment is that of the enclosing instance.
2462 Generic_Renamings.Set_Last (0);
2463 Generic_Renamings_HTable.Reset;
2465 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2467 -- Copy original generic tree, to produce text for instantiation.
2471 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2473 Act_Spec := Specification (Act_Tree);
2475 -- If this is the instance created to validate an actual package,
2476 -- only the formals matter, do not examine the package spec itself.
2478 if Is_Actual_Pack then
2479 Set_Visible_Declarations (Act_Spec, New_List);
2480 Set_Private_Declarations (Act_Spec, New_List);
2484 Analyze_Associations
2486 Generic_Formal_Declarations (Act_Tree),
2487 Generic_Formal_Declarations (Gen_Decl));
2489 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2490 Set_Is_Generic_Instance (Act_Decl_Id);
2492 Set_Generic_Parent (Act_Spec, Gen_Unit);
2494 -- References to the generic in its own declaration or its body
2495 -- are references to the instance. Add a renaming declaration for
2496 -- the generic unit itself. This declaration, as well as the renaming
2497 -- declarations for the generic formals, must remain private to the
2498 -- unit: the formals, because this is the language semantics, and
2499 -- the unit because its use is an artifact of the implementation.
2502 Make_Package_Renaming_Declaration (Loc,
2503 Defining_Unit_Name =>
2504 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2505 Name => New_Reference_To (Act_Decl_Id, Loc));
2507 Append (Unit_Renaming, Renaming_List);
2509 -- The renaming declarations are the first local declarations of
2512 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2514 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2516 Set_Visible_Declarations (Act_Spec, Renaming_List);
2520 Make_Package_Declaration (Loc,
2521 Specification => Act_Spec);
2523 -- Save the instantiation node, for subsequent instantiation
2524 -- of the body, if there is one and we are generating code for
2525 -- the current unit. Mark the unit as having a body, to avoid
2526 -- a premature error message.
2528 -- We instantiate the body if we are generating code, if we are
2529 -- generating cross-reference information, or if we are building
2530 -- trees for ASIS use.
2533 Enclosing_Body_Present : Boolean := False;
2534 -- If the generic unit is not a compilation unit, then a body
2535 -- may be present in its parent even if none is required. We
2536 -- create a tentative pending instantiation for the body, which
2537 -- will be discarded if none is actually present.
2542 if Scope (Gen_Unit) /= Standard_Standard
2543 and then not Is_Child_Unit (Gen_Unit)
2545 Scop := Scope (Gen_Unit);
2547 while Present (Scop)
2548 and then Scop /= Standard_Standard
2550 if Unit_Requires_Body (Scop) then
2551 Enclosing_Body_Present := True;
2554 elsif In_Open_Scopes (Scop)
2555 and then In_Package_Body (Scop)
2557 Enclosing_Body_Present := True;
2561 exit when Is_Compilation_Unit (Scop);
2562 Scop := Scope (Scop);
2566 -- If front-end inlining is enabled, and this is a unit for which
2567 -- code will be generated, we instantiate the body at once.
2568 -- This is done if the instance is not the main unit, and if the
2569 -- generic is not a child unit of another generic, to avoid scope
2570 -- problems and the reinstallation of parent instances.
2572 if Front_End_Inlining
2573 and then Expander_Active
2574 and then (not Is_Child_Unit (Gen_Unit)
2575 or else not Is_Generic_Unit (Scope (Gen_Unit)))
2576 and then (Is_In_Main_Unit (N)
2577 or else In_Main_Context (Current_Scope))
2578 and then Nkind (Parent (N)) /= N_Compilation_Unit
2579 and then Might_Inline_Subp
2580 and then not Is_Actual_Pack
2586 (Unit_Requires_Body (Gen_Unit)
2587 or else Enclosing_Body_Present
2588 or else Present (Corresponding_Body (Gen_Decl)))
2589 and then (Is_In_Main_Unit (N)
2590 or else Might_Inline_Subp)
2591 and then not Is_Actual_Pack
2592 and then not Inline_Now
2594 and then (Operating_Mode = Generate_Code
2595 or else (Operating_Mode = Check_Semantics
2596 and then ASIS_Mode));
2598 -- If front_end_inlining is enabled, do not instantiate a
2599 -- body if within a generic context.
2601 if (Front_End_Inlining
2602 and then not Expander_Active)
2603 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
2605 Needs_Body := False;
2608 -- If the current context is generic, and the package being
2609 -- instantiated is declared within a formal package, there
2610 -- is no body to instantiate until the enclosing generic is
2611 -- instantiated, and there is an actual for the formal
2612 -- package. If the formal package has parameters, we build a
2613 -- regular package instance for it, that preceeds the original
2614 -- formal package declaration.
2616 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
2618 Decl : constant Node_Id :=
2620 (Unit_Declaration_Node (Scope (Gen_Unit)));
2622 if Nkind (Decl) = N_Formal_Package_Declaration
2623 or else (Nkind (Decl) = N_Package_Declaration
2624 and then Is_List_Member (Decl)
2625 and then Present (Next (Decl))
2627 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
2629 Needs_Body := False;
2635 -- If we are generating the calling stubs from the instantiation
2636 -- of a generic RCI package, we will not use the body of the
2639 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2640 and then Is_Compilation_Unit (Defining_Entity (N))
2642 Needs_Body := False;
2647 -- Here is a defence against a ludicrous number of instantiations
2648 -- caused by a circular set of instantiation attempts.
2650 if Pending_Instantiations.Last >
2651 Hostparm.Max_Instantiations
2653 Error_Msg_N ("too many instantiations", N);
2654 raise Unrecoverable_Error;
2657 -- Indicate that the enclosing scopes contain an instantiation,
2658 -- and that cleanup actions should be delayed until after the
2659 -- instance body is expanded.
2661 Check_Forward_Instantiation (Gen_Decl);
2662 if Nkind (N) = N_Package_Instantiation then
2664 Enclosing_Master : Entity_Id := Current_Scope;
2667 while Enclosing_Master /= Standard_Standard loop
2669 if Ekind (Enclosing_Master) = E_Package then
2670 if Is_Compilation_Unit (Enclosing_Master) then
2671 if In_Package_Body (Enclosing_Master) then
2673 (Body_Entity (Enclosing_Master));
2682 Enclosing_Master := Scope (Enclosing_Master);
2685 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2686 Enclosing_Master := Scope (Enclosing_Master);
2688 elsif Is_Generic_Subprogram (Enclosing_Master)
2689 or else Ekind (Enclosing_Master) = E_Void
2691 -- Cleanup actions will eventually be performed on
2692 -- the enclosing instance, if any. enclosing scope
2693 -- is void in the formal part of a generic subp.
2698 if Ekind (Enclosing_Master) = E_Entry
2700 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2703 Protected_Body_Subprogram (Enclosing_Master);
2706 Set_Delay_Cleanups (Enclosing_Master);
2708 while Ekind (Enclosing_Master) = E_Block loop
2709 Enclosing_Master := Scope (Enclosing_Master);
2712 if Is_Subprogram (Enclosing_Master) then
2713 Delay_Descriptors (Enclosing_Master);
2715 elsif Is_Task_Type (Enclosing_Master) then
2717 TBP : constant Node_Id :=
2718 Get_Task_Body_Procedure
2722 if Present (TBP) then
2723 Delay_Descriptors (TBP);
2724 Set_Delay_Cleanups (TBP);
2734 -- Make entry in table
2736 Pending_Instantiations.Increment_Last;
2737 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2738 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2742 Set_Categorization_From_Pragmas (Act_Decl);
2744 if Parent_Installed then
2748 Set_Instance_Spec (N, Act_Decl);
2750 -- If not a compilation unit, insert the package declaration
2751 -- before the original instantiation node.
2753 if Nkind (Parent (N)) /= N_Compilation_Unit then
2754 Mark_Rewrite_Insertion (Act_Decl);
2755 Insert_Before (N, Act_Decl);
2758 -- For an instantiation that is a compilation unit, place
2759 -- declaration on current node so context is complete
2760 -- for analysis (including nested instantiations). It this
2761 -- is the main unit, the declaration eventually replaces the
2762 -- instantiation node. If the instance body is later created, it
2763 -- replaces the instance node, and the declation is attached to
2764 -- it (see Build_Instance_Compilation_Unit_Nodes).
2767 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2769 -- The entity for the current unit is the newly created one,
2770 -- and all semantic information is attached to it.
2772 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2774 -- If this is the main unit, replace the main entity as well.
2776 if Current_Sem_Unit = Main_Unit then
2777 Main_Unit_Entity := Act_Decl_Id;
2781 Set_Unit (Parent (N), Act_Decl);
2782 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2784 Set_Unit (Parent (N), N);
2785 Set_Body_Required (Parent (N), False);
2787 -- We never need elaboration checks on instantiations, since
2788 -- by definition, the body instantiation is elaborated at the
2789 -- same time as the spec instantiation.
2791 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2792 Set_Kill_Elaboration_Checks (Act_Decl_Id);
2795 Check_Elab_Instantiation (N);
2797 if ABE_Is_Certain (N) and then Needs_Body then
2798 Pending_Instantiations.Decrement_Last;
2800 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2802 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2803 First_Private_Entity (Act_Decl_Id));
2805 -- If the instantiation will receive a body, the unit will
2806 -- be transformed into a package body, and receive its own
2807 -- elaboration entity. Otherwise, the nature of the unit is
2808 -- now a package declaration.
2810 if Nkind (Parent (N)) = N_Compilation_Unit
2811 and then not Needs_Body
2813 Rewrite (N, Act_Decl);
2816 if Present (Corresponding_Body (Gen_Decl))
2817 or else Unit_Requires_Body (Gen_Unit)
2819 Set_Has_Completion (Act_Decl_Id);
2822 Check_Formal_Packages (Act_Decl_Id);
2824 Restore_Private_Views (Act_Decl_Id);
2826 if not Generic_Separately_Compiled (Gen_Unit) then
2827 Inherit_Context (Gen_Decl, N);
2830 if Parent_Installed then
2837 Validate_Categorization_Dependency (N, Act_Decl_Id);
2839 -- Check restriction, but skip this if something went wrong in
2840 -- the above analysis, indicated by Act_Decl_Id being void.
2842 if Ekind (Act_Decl_Id) /= E_Void
2843 and then not Is_Library_Level_Entity (Act_Decl_Id)
2845 Check_Restriction (No_Local_Allocators, N);
2849 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2853 when Instantiation_Error =>
2854 if Parent_Installed then
2857 end Analyze_Package_Instantiation;
2859 --------------------------
2860 -- Inline_Instance_Body --
2861 --------------------------
2863 procedure Inline_Instance_Body
2865 Gen_Unit : Entity_Id;
2869 Gen_Comp : constant Entity_Id :=
2870 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2871 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2872 Curr_Scope : Entity_Id := Empty;
2873 Curr_Unit : constant Entity_Id :=
2874 Cunit_Entity (Current_Sem_Unit);
2875 Removed : Boolean := False;
2876 Num_Scopes : Int := 0;
2877 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2878 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2879 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2880 Num_Inner : Int := 0;
2881 N_Instances : Int := 0;
2885 -- Case of generic unit defined in another unit. We must remove
2886 -- the complete context of the current unit to install that of
2889 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2893 and then S /= Standard_Standard
2895 Num_Scopes := Num_Scopes + 1;
2897 Use_Clauses (Num_Scopes) :=
2899 (Scope_Stack.Last - Num_Scopes + 1).
2901 End_Use_Clauses (Use_Clauses (Num_Scopes));
2903 exit when Is_Generic_Instance (S)
2904 and then (In_Package_Body (S)
2905 or else Ekind (S) = E_Procedure
2906 or else Ekind (S) = E_Function);
2910 Vis := Is_Immediately_Visible (Gen_Comp);
2912 -- Find and save all enclosing instances
2917 and then S /= Standard_Standard
2919 if Is_Generic_Instance (S) then
2920 N_Instances := N_Instances + 1;
2921 Instances (N_Instances) := S;
2923 exit when In_Package_Body (S);
2929 -- Remove context of current compilation unit, unless we
2930 -- are within a nested package instantiation, in which case
2931 -- the context has been removed previously.
2933 -- If current scope is the body of a child unit, remove context
2939 and then S /= Standard_Standard
2941 exit when Is_Generic_Instance (S)
2942 and then (In_Package_Body (S)
2943 or else Ekind (S) = E_Procedure
2944 or else Ekind (S) = E_Function);
2947 or else (Ekind (Curr_Unit) = E_Package_Body
2948 and then S = Spec_Entity (Curr_Unit))
2949 or else (Ekind (Curr_Unit) = E_Subprogram_Body
2952 (Unit_Declaration_Node (Curr_Unit)))
2956 -- Remove entities in current scopes from visibility, so
2957 -- than instance body is compiled in a clean environment.
2959 Save_Scope_Stack (Handle_Use => False);
2961 if Is_Child_Unit (S) then
2963 -- Remove child unit from stack, as well as inner scopes.
2964 -- Removing the context of a child unit removes parent
2967 while Current_Scope /= S loop
2968 Num_Inner := Num_Inner + 1;
2969 Inner_Scopes (Num_Inner) := Current_Scope;
2974 Remove_Context (Curr_Comp);
2978 Remove_Context (Curr_Comp);
2981 if Ekind (Curr_Unit) = E_Package_Body then
2982 Remove_Context (Library_Unit (Curr_Comp));
2989 New_Scope (Standard_Standard);
2990 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
2991 Instantiate_Package_Body
2992 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
2997 Set_Is_Immediately_Visible (Gen_Comp, Vis);
2999 -- Reset Generic_Instance flag so that use clauses can be installed
3000 -- in the proper order. (See Use_One_Package for effect of enclosing
3001 -- instances on processing of use clauses).
3003 for J in 1 .. N_Instances loop
3004 Set_Is_Generic_Instance (Instances (J), False);
3008 Install_Context (Curr_Comp);
3010 if Present (Curr_Scope)
3011 and then Is_Child_Unit (Curr_Scope)
3013 New_Scope (Curr_Scope);
3014 Set_Is_Immediately_Visible (Curr_Scope);
3016 -- Finally, restore inner scopes as well.
3018 for J in reverse 1 .. Num_Inner loop
3019 New_Scope (Inner_Scopes (J));
3023 Restore_Scope_Stack (Handle_Use => False);
3026 -- Restore use clauses. For a child unit, use clauses in the
3027 -- parents are restored when installing the context, so only
3028 -- those in inner scopes (and those local to the child unit itself)
3029 -- need to be installed explicitly.
3031 if Is_Child_Unit (Curr_Unit)
3034 for J in reverse 1 .. Num_Inner + 1 loop
3035 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3037 Install_Use_Clauses (Use_Clauses (J));
3041 for J in reverse 1 .. Num_Scopes loop
3042 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3044 Install_Use_Clauses (Use_Clauses (J));
3048 for J in 1 .. N_Instances loop
3049 Set_Is_Generic_Instance (Instances (J), True);
3052 -- If generic unit is in current unit, current context is correct.
3055 Instantiate_Package_Body
3056 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3058 end Inline_Instance_Body;
3060 -------------------------------------
3061 -- Analyze_Procedure_Instantiation --
3062 -------------------------------------
3064 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3066 Analyze_Subprogram_Instantiation (N, E_Procedure);
3067 end Analyze_Procedure_Instantiation;
3069 --------------------------------------
3070 -- Analyze_Subprogram_Instantiation --
3071 --------------------------------------
3073 procedure Analyze_Subprogram_Instantiation
3077 Loc : constant Source_Ptr := Sloc (N);
3078 Gen_Id : constant Node_Id := Name (N);
3080 Anon_Id : constant Entity_Id :=
3081 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3082 Chars => New_External_Name
3083 (Chars (Defining_Entity (N)), 'R'));
3085 Act_Decl_Id : Entity_Id;
3090 Gen_Unit : Entity_Id;
3092 Pack_Id : Entity_Id;
3093 Parent_Installed : Boolean := False;
3094 Renaming_List : List_Id;
3096 procedure Analyze_Instance_And_Renamings;
3097 -- The instance must be analyzed in a context that includes the
3098 -- mappings of generic parameters into actuals. We create a package
3099 -- declaration for this purpose, and a subprogram with an internal
3100 -- name within the package. The subprogram instance is simply an
3101 -- alias for the internal subprogram, declared in the current scope.
3103 ------------------------------------
3104 -- Analyze_Instance_And_Renamings --
3105 ------------------------------------
3107 procedure Analyze_Instance_And_Renamings is
3108 Def_Ent : constant Entity_Id := Defining_Entity (N);
3109 Pack_Decl : Node_Id;
3112 if Nkind (Parent (N)) = N_Compilation_Unit then
3114 -- For the case of a compilation unit, the container package
3115 -- has the same name as the instantiation, to insure that the
3116 -- binder calls the elaboration procedure with the right name.
3117 -- Copy the entity of the instance, which may have compilation
3118 -- level flags (e.g. Is_Child_Unit) set.
3120 Pack_Id := New_Copy (Def_Ent);
3123 -- Otherwise we use the name of the instantiation concatenated
3124 -- with its source position to ensure uniqueness if there are
3125 -- several instantiations with the same name.
3128 Make_Defining_Identifier (Loc,
3129 Chars => New_External_Name
3130 (Related_Id => Chars (Def_Ent),
3132 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3135 Pack_Decl := Make_Package_Declaration (Loc,
3136 Specification => Make_Package_Specification (Loc,
3137 Defining_Unit_Name => Pack_Id,
3138 Visible_Declarations => Renaming_List,
3139 End_Label => Empty));
3141 Set_Instance_Spec (N, Pack_Decl);
3142 Set_Is_Generic_Instance (Pack_Id);
3143 Set_Needs_Debug_Info (Pack_Id);
3145 -- Case of not a compilation unit
3147 if Nkind (Parent (N)) /= N_Compilation_Unit then
3148 Mark_Rewrite_Insertion (Pack_Decl);
3149 Insert_Before (N, Pack_Decl);
3150 Set_Has_Completion (Pack_Id);
3152 -- Case of an instantiation that is a compilation unit
3154 -- Place declaration on current node so context is complete
3155 -- for analysis (including nested instantiations), and for
3156 -- use in a context_clause (see Analyze_With_Clause).
3159 Set_Unit (Parent (N), Pack_Decl);
3160 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3163 Analyze (Pack_Decl);
3164 Check_Formal_Packages (Pack_Id);
3165 Set_Is_Generic_Instance (Pack_Id, False);
3167 -- Body of the enclosing package is supplied when instantiating
3168 -- the subprogram body, after semantic analysis is completed.
3170 if Nkind (Parent (N)) = N_Compilation_Unit then
3172 -- Remove package itself from visibility, so it does not
3173 -- conflict with subprogram.
3175 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3177 -- Set name and scope of internal subprogram so that the
3178 -- proper external name will be generated. The proper scope
3179 -- is the scope of the wrapper package. We need to generate
3180 -- debugging information for the internal subprogram, so set
3181 -- flag accordingly.
3183 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3184 Set_Scope (Anon_Id, Scope (Pack_Id));
3186 -- Mark wrapper package as referenced, to avoid spurious
3187 -- warnings if the instantiation appears in various with_
3188 -- clauses of subunits of the main unit.
3190 Set_Referenced (Pack_Id);
3193 Set_Is_Generic_Instance (Anon_Id);
3194 Set_Needs_Debug_Info (Anon_Id);
3195 Act_Decl_Id := New_Copy (Anon_Id);
3197 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3198 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3199 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3200 Set_Comes_From_Source (Act_Decl_Id, True);
3202 -- The signature may involve types that are not frozen yet, but
3203 -- the subprogram will be frozen at the point the wrapper package
3204 -- is frozen, so it does not need its own freeze node. In fact, if
3205 -- one is created, it might conflict with the freezing actions from
3206 -- the wrapper package (see 7206-013).
3208 Set_Has_Delayed_Freeze (Anon_Id, False);
3210 -- If the instance is a child unit, mark the Id accordingly. Mark
3211 -- the anonymous entity as well, which is the real subprogram and
3212 -- which is used when the instance appears in a context clause.
3214 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3215 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3216 New_Overloaded_Entity (Act_Decl_Id);
3217 Check_Eliminated (Act_Decl_Id);
3219 -- In compilation unit case, kill elaboration checks on the
3220 -- instantiation, since they are never needed -- the body is
3221 -- instantiated at the same point as the spec.
3223 if Nkind (Parent (N)) = N_Compilation_Unit then
3224 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3225 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3226 Set_Is_Compilation_Unit (Anon_Id);
3228 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3231 -- The instance is not a freezing point for the new subprogram.
3233 Set_Is_Frozen (Act_Decl_Id, False);
3235 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3236 Valid_Operator_Definition (Act_Decl_Id);
3239 Set_Alias (Act_Decl_Id, Anon_Id);
3240 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3241 Set_Has_Completion (Act_Decl_Id);
3242 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3244 if Nkind (Parent (N)) = N_Compilation_Unit then
3245 Set_Body_Required (Parent (N), False);
3248 end Analyze_Instance_And_Renamings;
3250 -- Start of processing for Analyze_Subprogram_Instantiation
3253 -- Very first thing: apply the special kludge for Text_IO processing
3254 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3255 -- Of course such an instantiation is bogus (these are packages, not
3256 -- subprograms), but we get a better error message if we do this.
3258 Text_IO_Kludge (Gen_Id);
3260 -- Make node global for error reporting.
3262 Instantiation_Node := N;
3263 Pre_Analyze_Actuals (N);
3266 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3267 Gen_Unit := Entity (Gen_Id);
3269 Generate_Reference (Gen_Unit, Gen_Id);
3271 if Nkind (Gen_Id) = N_Identifier
3272 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3275 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3278 if Etype (Gen_Unit) = Any_Type then
3283 -- Verify that it is a generic subprogram of the right kind, and that
3284 -- it does not lead to a circular instantiation.
3286 if Ekind (Gen_Unit) /= E_Generic_Procedure
3287 and then Ekind (Gen_Unit) /= E_Generic_Function
3289 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3291 elsif In_Open_Scopes (Gen_Unit) then
3292 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3294 elsif K = E_Procedure
3295 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3297 if Ekind (Gen_Unit) = E_Generic_Function then
3299 ("cannot instantiate generic function as procedure", Gen_Id);
3302 ("expect name of generic procedure in instantiation", Gen_Id);
3305 elsif K = E_Function
3306 and then Ekind (Gen_Unit) /= E_Generic_Function
3308 if Ekind (Gen_Unit) = E_Generic_Procedure then
3310 ("cannot instantiate generic procedure as function", Gen_Id);
3313 ("expect name of generic function in instantiation", Gen_Id);
3317 Set_Entity (Gen_Id, Gen_Unit);
3318 Set_Is_Instantiated (Gen_Unit);
3320 if In_Extended_Main_Source_Unit (N) then
3321 Generate_Reference (Gen_Unit, N);
3324 -- If renaming, get original unit
3326 if Present (Renamed_Object (Gen_Unit))
3327 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3329 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3331 Gen_Unit := Renamed_Object (Gen_Unit);
3332 Set_Is_Instantiated (Gen_Unit);
3333 Generate_Reference (Gen_Unit, N);
3336 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3337 Error_Msg_Node_2 := Current_Scope;
3339 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3340 Circularity_Detected := True;
3344 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3346 -- The subprogram itself cannot contain a nested instance, so
3347 -- the current parent is left empty.
3349 Set_Instance_Env (Gen_Unit, Empty);
3351 -- Initialize renamings map, for error checking.
3353 Generic_Renamings.Set_Last (0);
3354 Generic_Renamings_HTable.Reset;
3356 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3358 -- Copy original generic tree, to produce text for instantiation.
3362 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3364 Act_Spec := Specification (Act_Tree);
3366 Analyze_Associations
3368 Generic_Formal_Declarations (Act_Tree),
3369 Generic_Formal_Declarations (Gen_Decl));
3371 -- Build the subprogram declaration, which does not appear
3372 -- in the generic template, and give it a sloc consistent
3373 -- with that of the template.
3375 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3376 Set_Generic_Parent (Act_Spec, Gen_Unit);
3378 Make_Subprogram_Declaration (Sloc (Act_Spec),
3379 Specification => Act_Spec);
3381 Set_Categorization_From_Pragmas (Act_Decl);
3383 if Parent_Installed then
3387 Append (Act_Decl, Renaming_List);
3388 Analyze_Instance_And_Renamings;
3390 -- If the generic is marked Import (Intrinsic), then so is the
3391 -- instance. This indicates that there is no body to instantiate.
3392 -- If generic is marked inline, so it the instance, and the
3393 -- anonymous subprogram it renames. If inlined, or else if inlining
3394 -- is enabled for the compilation, we generate the instance body
3395 -- even if it is not within the main unit.
3397 -- Any other pragmas might also be inherited ???
3399 if Is_Intrinsic_Subprogram (Gen_Unit) then
3400 Set_Is_Intrinsic_Subprogram (Anon_Id);
3401 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3403 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3404 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3408 Generate_Definition (Act_Decl_Id);
3410 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3411 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3413 if not Is_Intrinsic_Subprogram (Gen_Unit) then
3414 Check_Elab_Instantiation (N);
3417 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3419 -- Subject to change, pending on if other pragmas are inherited ???
3421 Validate_Categorization_Dependency (N, Act_Decl_Id);
3423 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3425 if not Generic_Separately_Compiled (Gen_Unit) then
3426 Inherit_Context (Gen_Decl, N);
3429 Restore_Private_Views (Pack_Id, False);
3431 -- If the context requires a full instantiation, mark node for
3432 -- subsequent construction of the body.
3434 if (Is_In_Main_Unit (N)
3435 or else Is_Inlined (Act_Decl_Id))
3436 and then (Operating_Mode = Generate_Code
3437 or else (Operating_Mode = Check_Semantics
3438 and then ASIS_Mode))
3439 and then (Expander_Active or else ASIS_Mode)
3440 and then not ABE_Is_Certain (N)
3441 and then not Is_Eliminated (Act_Decl_Id)
3443 Pending_Instantiations.Increment_Last;
3444 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3445 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3446 Check_Forward_Instantiation (Gen_Decl);
3448 -- The wrapper package is always delayed, because it does
3449 -- not constitute a freeze point, but to insure that the
3450 -- freeze node is placed properly, it is created directly
3451 -- when instantiating the body (otherwise the freeze node
3452 -- might appear to early for nested instantiations).
3454 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3456 -- For ASIS purposes, indicate that the wrapper package has
3457 -- replaced the instantiation node.
3459 Rewrite (N, Unit (Parent (N)));
3460 Set_Unit (Parent (N), N);
3463 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3465 -- Replace instance node for library-level instantiations
3466 -- of intrinsic subprograms, for ASIS use.
3468 Rewrite (N, Unit (Parent (N)));
3469 Set_Unit (Parent (N), N);
3472 if Parent_Installed then
3477 Generic_Renamings.Set_Last (0);
3478 Generic_Renamings_HTable.Reset;
3482 when Instantiation_Error =>
3483 if Parent_Installed then
3486 end Analyze_Subprogram_Instantiation;
3488 -------------------------
3489 -- Get_Associated_Node --
3490 -------------------------
3492 function Get_Associated_Node (N : Node_Id) return Node_Id is
3493 Assoc : Node_Id := Associated_Node (N);
3496 if Nkind (Assoc) /= Nkind (N) then
3499 elsif Nkind (Assoc) = N_Aggregate
3500 or else Nkind (Assoc) = N_Extension_Aggregate
3505 -- If the node is part of an inner generic, it may itself have been
3506 -- remapped into a further generic copy. Associated_Node is otherwise
3507 -- used for the entity of the node, and will be of a different node
3508 -- kind, or else N has been rewritten as a literal or function call.
3510 while Present (Associated_Node (Assoc))
3511 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3513 Assoc := Associated_Node (Assoc);
3516 -- Follow and additional link in case the final node was rewritten.
3517 -- This can only happen with nested generic units.
3519 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3520 and then Present (Associated_Node (Assoc))
3521 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3523 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3525 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3527 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3529 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3531 Assoc := Associated_Node (Assoc);
3536 end Get_Associated_Node;
3538 -------------------------------------------
3539 -- Build_Instance_Compilation_Unit_Nodes --
3540 -------------------------------------------
3542 procedure Build_Instance_Compilation_Unit_Nodes
3547 Decl_Cunit : Node_Id;
3548 Body_Cunit : Node_Id;
3550 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3551 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3554 -- A new compilation unit node is built for the instance declaration
3557 Make_Compilation_Unit (Sloc (N),
3558 Context_Items => Empty_List,
3561 Make_Compilation_Unit_Aux (Sloc (N)));
3563 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3564 Set_Body_Required (Decl_Cunit, True);
3566 -- We use the original instantiation compilation unit as the resulting
3567 -- compilation unit of the instance, since this is the main unit.
3569 Rewrite (N, Act_Body);
3570 Body_Cunit := Parent (N);
3572 -- The two compilation unit nodes are linked by the Library_Unit field
3574 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3575 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3577 -- Preserve the private nature of the package if needed.
3579 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
3581 -- If the instance is not the main unit, its context, categorization,
3582 -- and elaboration entity are not relevant to the compilation.
3584 if Parent (N) /= Cunit (Main_Unit) then
3588 -- The context clause items on the instantiation, which are now
3589 -- attached to the body compilation unit (since the body overwrote
3590 -- the original instantiation node), semantically belong on the spec,
3591 -- so copy them there. It's harmless to leave them on the body as well.
3592 -- In fact one could argue that they belong in both places.
3594 Citem := First (Context_Items (Body_Cunit));
3595 while Present (Citem) loop
3596 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3600 -- Propagate categorization flags on packages, so that they appear
3601 -- in ali file for the spec of the unit.
3603 if Ekind (New_Main) = E_Package then
3604 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3605 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3606 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3607 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3608 Set_Is_Remote_Call_Interface
3609 (Old_Main, Is_Remote_Call_Interface (New_Main));
3612 -- Make entry in Units table, so that binder can generate call to
3613 -- elaboration procedure for body, if any.
3615 Make_Instance_Unit (Body_Cunit);
3616 Main_Unit_Entity := New_Main;
3617 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3619 -- Build elaboration entity, since the instance may certainly
3620 -- generate elaboration code requiring a flag for protection.
3622 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3623 end Build_Instance_Compilation_Unit_Nodes;
3625 -----------------------------------
3626 -- Check_Formal_Package_Instance --
3627 -----------------------------------
3629 -- If the formal has specific parameters, they must match those of the
3630 -- actual. Both of them are instances, and the renaming declarations
3631 -- for their formal parameters appear in the same order in both. The
3632 -- analyzed formal has been analyzed in the context of the current
3635 procedure Check_Formal_Package_Instance
3636 (Formal_Pack : Entity_Id;
3637 Actual_Pack : Entity_Id)
3639 E1 : Entity_Id := First_Entity (Actual_Pack);
3640 E2 : Entity_Id := First_Entity (Formal_Pack);
3645 procedure Check_Mismatch (B : Boolean);
3646 -- Common error routine for mismatch between the parameters of
3647 -- the actual instance and those of the formal package.
3649 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
3650 -- The formal may come from a nested formal package, and the actual
3651 -- may have been constant-folded. To determine whether the two denote
3652 -- the same entity we may have to traverse several definitions to
3653 -- recover the ultimate entity that they refer to.
3655 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
3656 -- Similarly, if the formal comes from a nested formal package, the
3657 -- actual may designate the formal through multiple renamings, which
3658 -- have to be followed to determine the original variable in question.
3660 --------------------
3661 -- Check_Mismatch --
3662 --------------------
3664 procedure Check_Mismatch (B : Boolean) is
3668 ("actual for & in actual instance does not match formal",
3669 Parent (Actual_Pack), E1);
3673 --------------------------------
3674 -- Same_Instantiated_Constant --
3675 --------------------------------
3677 function Same_Instantiated_Constant
3678 (E1, E2 : Entity_Id) return Boolean
3683 while Present (Ent) loop
3687 elsif Ekind (Ent) /= E_Constant then
3690 elsif Is_Entity_Name (Constant_Value (Ent)) then
3691 if Entity (Constant_Value (Ent)) = E1 then
3694 Ent := Entity (Constant_Value (Ent));
3697 -- The actual may be a constant that has been folded. Recover
3700 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
3701 Ent := Entity (Original_Node (Constant_Value (Ent)));
3708 end Same_Instantiated_Constant;
3710 --------------------------------
3711 -- Same_Instantiated_Variable --
3712 --------------------------------
3714 function Same_Instantiated_Variable
3715 (E1, E2 : Entity_Id) return Boolean
3717 function Original_Entity (E : Entity_Id) return Entity_Id;
3718 -- Follow chain of renamings to the ultimate ancestor.
3720 ---------------------
3721 -- Original_Entity --
3722 ---------------------
3724 function Original_Entity (E : Entity_Id) return Entity_Id is
3729 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
3730 and then Present (Renamed_Object (Orig))
3731 and then Is_Entity_Name (Renamed_Object (Orig))
3733 Orig := Entity (Renamed_Object (Orig));
3737 end Original_Entity;
3739 -- Start of processing for Same_Instantiated_Variable
3742 return Ekind (E1) = Ekind (E2)
3743 and then Original_Entity (E1) = Original_Entity (E2);
3744 end Same_Instantiated_Variable;
3746 -- Start of processing for Check_Formal_Package_Instance
3750 and then Present (E2)
3752 exit when Ekind (E1) = E_Package
3753 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3755 if Is_Type (E1) then
3757 -- Subtypes must statically match. E1 and E2 are the
3758 -- local entities that are subtypes of the actuals.
3759 -- Itypes generated for other parameters need not be checked,
3760 -- the check will be performed on the parameters themselves.
3762 if not Is_Itype (E1)
3763 and then not Is_Itype (E2)
3767 or else Etype (E1) /= Etype (E2)
3768 or else not Subtypes_Statically_Match (E1, E2));
3771 elsif Ekind (E1) = E_Constant then
3773 -- IN parameters must denote the same static value, or
3774 -- the same constant, or the literal null.
3776 Expr1 := Expression (Parent (E1));
3778 if Ekind (E2) /= E_Constant then
3779 Check_Mismatch (True);
3782 Expr2 := Expression (Parent (E2));
3785 if Is_Static_Expression (Expr1) then
3787 if not Is_Static_Expression (Expr2) then
3788 Check_Mismatch (True);
3790 elsif Is_Integer_Type (Etype (E1)) then
3793 V1 : constant Uint := Expr_Value (Expr1);
3794 V2 : constant Uint := Expr_Value (Expr2);
3796 Check_Mismatch (V1 /= V2);
3799 elsif Is_Real_Type (Etype (E1)) then
3801 V1 : constant Ureal := Expr_Value_R (Expr1);
3802 V2 : constant Ureal := Expr_Value_R (Expr2);
3804 Check_Mismatch (V1 /= V2);
3807 elsif Is_String_Type (Etype (E1))
3808 and then Nkind (Expr1) = N_String_Literal
3811 if Nkind (Expr2) /= N_String_Literal then
3812 Check_Mismatch (True);
3815 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3819 elsif Is_Entity_Name (Expr1) then
3820 if Is_Entity_Name (Expr2) then
3821 if Entity (Expr1) = Entity (Expr2) then
3825 (not Same_Instantiated_Constant
3826 (Entity (Expr1), Entity (Expr2)));
3829 Check_Mismatch (True);
3832 elsif Is_Entity_Name (Original_Node (Expr1))
3833 and then Is_Entity_Name (Expr2)
3835 Same_Instantiated_Constant
3836 (Entity (Original_Node (Expr1)), Entity (Expr2))
3840 elsif Nkind (Expr1) = N_Null then
3841 Check_Mismatch (Nkind (Expr1) /= N_Null);
3844 Check_Mismatch (True);
3847 elsif Ekind (E1) = E_Variable then
3848 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
3850 elsif Ekind (E1) = E_Package then
3852 (Ekind (E1) /= Ekind (E2)
3853 or else Renamed_Object (E1) /= Renamed_Object (E2));
3855 elsif Is_Overloadable (E1) then
3857 -- Verify that the names of the entities match.
3858 -- What if actual is an attribute ???
3861 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3864 raise Program_Error;
3871 end Check_Formal_Package_Instance;
3873 ---------------------------
3874 -- Check_Formal_Packages --
3875 ---------------------------
3877 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3879 Formal_P : Entity_Id;
3882 -- Iterate through the declarations in the instance, looking for
3883 -- package renaming declarations that denote instances of formal
3884 -- packages. Stop when we find the renaming of the current package
3885 -- itself. The declaration for a formal package without a box is
3886 -- followed by an internal entity that repeats the instantiation.
3888 E := First_Entity (P_Id);
3889 while Present (E) loop
3890 if Ekind (E) = E_Package then
3891 if Renamed_Object (E) = P_Id then
3894 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3897 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3898 Formal_P := Next_Entity (E);
3899 Check_Formal_Package_Instance (Formal_P, E);
3905 end Check_Formal_Packages;
3907 ---------------------------------
3908 -- Check_Forward_Instantiation --
3909 ---------------------------------
3911 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3913 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3916 -- The instantiation appears before the generic body if we are in the
3917 -- scope of the unit containing the generic, either in its spec or in
3918 -- the package body. and before the generic body.
3920 if Ekind (Gen_Comp) = E_Package_Body then
3921 Gen_Comp := Spec_Entity (Gen_Comp);
3924 if In_Open_Scopes (Gen_Comp)
3925 and then No (Corresponding_Body (Decl))
3930 and then not Is_Compilation_Unit (S)
3931 and then not Is_Child_Unit (S)
3933 if Ekind (S) = E_Package then
3934 Set_Has_Forward_Instantiation (S);
3940 end Check_Forward_Instantiation;
3942 ---------------------------
3943 -- Check_Generic_Actuals --
3944 ---------------------------
3946 -- The visibility of the actuals may be different between the
3947 -- point of generic instantiation and the instantiation of the body.
3949 procedure Check_Generic_Actuals
3950 (Instance : Entity_Id;
3951 Is_Formal_Box : Boolean)
3956 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
3957 -- For a formal that is an array type, the component type is often
3958 -- a previous formal in the same unit. The privacy status of the
3959 -- component type will have been examined earlier in the traversal
3960 -- of the corresponding actuals, and this status should not be
3961 -- modified for the array type itself.
3962 -- To detect this case we have to rescan the list of formals, which
3963 -- is usually short enough to ignore the resulting inefficiency.
3965 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
3968 Prev := First_Entity (Instance);
3969 while Present (Prev) loop
3971 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
3972 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
3973 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
3983 end Denotes_Previous_Actual;
3985 -- Start of processing for Check_Generic_Actuals
3988 E := First_Entity (Instance);
3989 while Present (E) loop
3991 and then Nkind (Parent (E)) = N_Subtype_Declaration
3992 and then Scope (Etype (E)) /= Instance
3993 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
3995 if Is_Array_Type (E)
3996 and then Denotes_Previous_Actual (Component_Type (E))
4000 Check_Private_View (Subtype_Indication (Parent (E)));
4002 Set_Is_Generic_Actual_Type (E, True);
4003 Set_Is_Hidden (E, False);
4004 Set_Is_Potentially_Use_Visible (E,
4007 -- We constructed the generic actual type as a subtype of
4008 -- the supplied type. This means that it normally would not
4009 -- inherit subtype specific attributes of the actual, which
4010 -- is wrong for the generic case.
4012 Astype := Ancestor_Subtype (E);
4016 -- can happen when E is an itype that is the full view of
4017 -- a private type completed, e.g. with a constrained array.
4019 Astype := Base_Type (E);
4022 Set_Size_Info (E, (Astype));
4023 Set_RM_Size (E, RM_Size (Astype));
4024 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4026 if Is_Discrete_Or_Fixed_Point_Type (E) then
4027 Set_RM_Size (E, RM_Size (Astype));
4029 -- In nested instances, the base type of an access actual
4030 -- may itself be private, and need to be exchanged.
4032 elsif Is_Access_Type (E)
4033 and then Is_Private_Type (Etype (E))
4036 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4039 elsif Ekind (E) = E_Package then
4041 -- If this is the renaming for the current instance, we're done.
4042 -- Otherwise it is a formal package. If the corresponding formal
4043 -- was declared with a box, the (instantiations of the) generic
4044 -- formal part are also visible. Otherwise, ignore the entity
4045 -- created to validate the actuals.
4047 if Renamed_Object (E) = Instance then
4050 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4053 -- The visibility of a formal of an enclosing generic is already
4056 elsif Denotes_Formal_Package (E) then
4059 elsif Present (Associated_Formal_Package (E)) then
4060 if Box_Present (Parent (Associated_Formal_Package (E))) then
4061 Check_Generic_Actuals (Renamed_Object (E), True);
4064 Set_Is_Hidden (E, False);
4067 -- If this is a subprogram instance (in a wrapper package) the
4068 -- actual is fully visible.
4070 elsif Is_Wrapper_Package (Instance) then
4071 Set_Is_Hidden (E, False);
4074 Set_Is_Hidden (E, not Is_Formal_Box);
4079 end Check_Generic_Actuals;
4081 ------------------------------
4082 -- Check_Generic_Child_Unit --
4083 ------------------------------
4085 procedure Check_Generic_Child_Unit
4087 Parent_Installed : in out Boolean)
4089 Loc : constant Source_Ptr := Sloc (Gen_Id);
4090 Gen_Par : Entity_Id := Empty;
4091 Inst_Par : Entity_Id;
4095 function Find_Generic_Child
4097 Id : Node_Id) return Entity_Id;
4098 -- Search generic parent for possible child unit with the given name.
4100 function In_Enclosing_Instance return Boolean;
4101 -- Within an instance of the parent, the child unit may be denoted
4102 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4103 -- scopes to locate a possible parent instantiation.
4105 ------------------------
4106 -- Find_Generic_Child --
4107 ------------------------
4109 function Find_Generic_Child
4111 Id : Node_Id) return Entity_Id
4116 -- If entity of name is already set, instance has already been
4117 -- resolved, e.g. in an enclosing instantiation.
4119 if Present (Entity (Id)) then
4120 if Scope (Entity (Id)) = Scop then
4127 E := First_Entity (Scop);
4128 while Present (E) loop
4129 if Chars (E) = Chars (Id)
4130 and then Is_Child_Unit (E)
4132 if Is_Child_Unit (E)
4133 and then not Is_Visible_Child_Unit (E)
4136 ("generic child unit& is not visible", Gen_Id, E);
4148 end Find_Generic_Child;
4150 ---------------------------
4151 -- In_Enclosing_Instance --
4152 ---------------------------
4154 function In_Enclosing_Instance return Boolean is
4155 Enclosing_Instance : Node_Id;
4156 Instance_Decl : Node_Id;
4159 Enclosing_Instance := Current_Scope;
4161 while Present (Enclosing_Instance) loop
4162 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4164 if Ekind (Enclosing_Instance) = E_Package
4165 and then Is_Generic_Instance (Enclosing_Instance)
4167 (Generic_Parent (Specification (Instance_Decl)))
4169 -- Check whether the generic we are looking for is a child
4170 -- of this instance.
4172 E := Find_Generic_Child
4173 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4174 exit when Present (E);
4180 Enclosing_Instance := Scope (Enclosing_Instance);
4192 Make_Expanded_Name (Loc,
4194 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4195 Selector_Name => New_Occurrence_Of (E, Loc)));
4197 Set_Entity (Gen_Id, E);
4198 Set_Etype (Gen_Id, Etype (E));
4199 Parent_Installed := False; -- Already in scope.
4202 end In_Enclosing_Instance;
4204 -- Start of processing for Check_Generic_Child_Unit
4207 -- If the name of the generic is given by a selected component, it
4208 -- may be the name of a generic child unit, and the prefix is the name
4209 -- of an instance of the parent, in which case the child unit must be
4210 -- visible. If this instance is not in scope, it must be placed there
4211 -- and removed after instantiation, because what is being instantiated
4212 -- is not the original child, but the corresponding child present in
4213 -- the instance of the parent.
4215 -- If the child is instantiated within the parent, it can be given by
4216 -- a simple name. In this case the instance is already in scope, but
4217 -- the child generic must be recovered from the generic parent as well.
4219 if Nkind (Gen_Id) = N_Selected_Component then
4220 S := Selector_Name (Gen_Id);
4221 Analyze (Prefix (Gen_Id));
4222 Inst_Par := Entity (Prefix (Gen_Id));
4224 if Ekind (Inst_Par) = E_Package
4225 and then Present (Renamed_Object (Inst_Par))
4227 Inst_Par := Renamed_Object (Inst_Par);
4230 if Ekind (Inst_Par) = E_Package then
4231 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
4232 Gen_Par := Generic_Parent (Parent (Inst_Par));
4234 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
4236 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
4238 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
4241 elsif Ekind (Inst_Par) = E_Generic_Package
4242 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
4244 -- A formal package may be a real child package, and not the
4245 -- implicit instance within a parent. In this case the child is
4246 -- not visible and has to be retrieved explicitly as well.
4248 Gen_Par := Inst_Par;
4251 if Present (Gen_Par) then
4253 -- The prefix denotes an instantiation. The entity itself
4254 -- may be a nested generic, or a child unit.
4256 E := Find_Generic_Child (Gen_Par, S);
4259 Change_Selected_Component_To_Expanded_Name (Gen_Id);
4260 Set_Entity (Gen_Id, E);
4261 Set_Etype (Gen_Id, Etype (E));
4263 Set_Etype (S, Etype (E));
4265 -- Indicate that this is a reference to the parent.
4267 if In_Extended_Main_Source_Unit (Gen_Id) then
4268 Set_Is_Instantiated (Inst_Par);
4271 -- A common mistake is to replicate the naming scheme of
4272 -- a hierarchy by instantiating a generic child directly,
4273 -- rather than the implicit child in a parent instance:
4275 -- generic .. package Gpar is ..
4276 -- generic .. package Gpar.Child is ..
4277 -- package Par is new Gpar ();
4280 -- package Par.Child is new Gpar.Child ();
4281 -- rather than Par.Child
4283 -- In this case the instantiation is within Par, which is
4284 -- an instance, but Gpar does not denote Par because we are
4285 -- not IN the instance of Gpar, so this is illegal. The test
4286 -- below recognizes this particular case.
4288 if Is_Child_Unit (E)
4289 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
4290 and then (not In_Instance
4291 or else Nkind (Parent (Parent (Gen_Id))) =
4295 ("prefix of generic child unit must be instance of parent",
4299 if not In_Open_Scopes (Inst_Par)
4300 and then Nkind (Parent (Gen_Id)) not in
4301 N_Generic_Renaming_Declaration
4303 Install_Parent (Inst_Par);
4304 Parent_Installed := True;
4308 -- If the generic parent does not contain an entity that
4309 -- corresponds to the selector, the instance doesn't either.
4310 -- Analyzing the node will yield the appropriate error message.
4311 -- If the entity is not a child unit, then it is an inner
4312 -- generic in the parent.
4320 if Is_Child_Unit (Entity (Gen_Id))
4322 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4323 and then not In_Open_Scopes (Inst_Par)
4325 Install_Parent (Inst_Par);
4326 Parent_Installed := True;
4330 elsif Nkind (Gen_Id) = N_Expanded_Name then
4332 -- Entity already present, analyze prefix, whose meaning may be
4333 -- an instance in the current context. If it is an instance of
4334 -- a relative within another, the proper parent may still have
4335 -- to be installed, if they are not of the same generation.
4337 Analyze (Prefix (Gen_Id));
4338 Inst_Par := Entity (Prefix (Gen_Id));
4340 if In_Enclosing_Instance then
4343 elsif Present (Entity (Gen_Id))
4344 and then Is_Child_Unit (Entity (Gen_Id))
4345 and then not In_Open_Scopes (Inst_Par)
4347 Install_Parent (Inst_Par);
4348 Parent_Installed := True;
4351 elsif In_Enclosing_Instance then
4353 -- The child unit is found in some enclosing scope
4360 -- If this is the renaming of the implicit child in a parent
4361 -- instance, recover the parent name and install it.
4363 if Is_Entity_Name (Gen_Id) then
4364 E := Entity (Gen_Id);
4366 if Is_Generic_Unit (E)
4367 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
4368 and then Is_Child_Unit (Renamed_Object (E))
4369 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
4370 and then Nkind (Name (Parent (E))) = N_Expanded_Name
4373 New_Copy_Tree (Name (Parent (E))));
4374 Inst_Par := Entity (Prefix (Gen_Id));
4376 if not In_Open_Scopes (Inst_Par) then
4377 Install_Parent (Inst_Par);
4378 Parent_Installed := True;
4381 -- If it is a child unit of a non-generic parent, it may be
4382 -- use-visible and given by a direct name. Install parent as
4385 elsif Is_Generic_Unit (E)
4386 and then Is_Child_Unit (E)
4388 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4389 and then not Is_Generic_Unit (Scope (E))
4391 if not In_Open_Scopes (Scope (E)) then
4392 Install_Parent (Scope (E));
4393 Parent_Installed := True;
4398 end Check_Generic_Child_Unit;
4400 -----------------------------
4401 -- Check_Hidden_Child_Unit --
4402 -----------------------------
4404 procedure Check_Hidden_Child_Unit
4406 Gen_Unit : Entity_Id;
4407 Act_Decl_Id : Entity_Id)
4409 Gen_Id : constant Node_Id := Name (N);
4412 if Is_Child_Unit (Gen_Unit)
4413 and then Is_Child_Unit (Act_Decl_Id)
4414 and then Nkind (Gen_Id) = N_Expanded_Name
4415 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4416 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4418 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4420 ("generic unit & is implicitly declared in &",
4421 Defining_Unit_Name (N), Gen_Unit);
4422 Error_Msg_N ("\instance must have different name",
4423 Defining_Unit_Name (N));
4425 end Check_Hidden_Child_Unit;
4427 ------------------------
4428 -- Check_Private_View --
4429 ------------------------
4431 procedure Check_Private_View (N : Node_Id) is
4432 T : constant Entity_Id := Etype (N);
4436 -- Exchange views if the type was not private in the generic but is
4437 -- private at the point of instantiation. Do not exchange views if
4438 -- the scope of the type is in scope. This can happen if both generic
4439 -- and instance are sibling units, or if type is defined in a parent.
4440 -- In this case the visibility of the type will be correct for all
4444 BT := Base_Type (T);
4446 if Is_Private_Type (T)
4447 and then not Has_Private_View (N)
4448 and then Present (Full_View (T))
4449 and then not In_Open_Scopes (Scope (T))
4451 -- In the generic, the full type was visible. Save the
4452 -- private entity, for subsequent exchange.
4456 elsif Has_Private_View (N)
4457 and then not Is_Private_Type (T)
4458 and then not Has_Been_Exchanged (T)
4459 and then Etype (Get_Associated_Node (N)) /= T
4461 -- Only the private declaration was visible in the generic. If
4462 -- the type appears in a subtype declaration, the subtype in the
4463 -- instance must have a view compatible with that of its parent,
4464 -- which must be exchanged (see corresponding code in Restore_
4465 -- Private_Views). Otherwise, if the type is defined in a parent
4466 -- unit, leave full visibility within instance, which is safe.
4468 if In_Open_Scopes (Scope (Base_Type (T)))
4469 and then not Is_Private_Type (Base_Type (T))
4470 and then Comes_From_Source (Base_Type (T))
4474 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4475 or else not In_Private_Part (Scope (Base_Type (T)))
4477 Append_Elmt (T, Exchanged_Views);
4478 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4481 -- For composite types with inconsistent representation
4482 -- exchange component types accordingly.
4484 elsif Is_Access_Type (T)
4485 and then Is_Private_Type (Designated_Type (T))
4486 and then not Has_Private_View (N)
4487 and then Present (Full_View (Designated_Type (T)))
4489 Switch_View (Designated_Type (T));
4491 elsif Is_Array_Type (T)
4492 and then Is_Private_Type (Component_Type (T))
4493 and then not Has_Private_View (N)
4494 and then Present (Full_View (Component_Type (T)))
4496 Switch_View (Component_Type (T));
4498 elsif Is_Private_Type (T)
4499 and then Present (Full_View (T))
4500 and then Is_Array_Type (Full_View (T))
4501 and then Is_Private_Type (Component_Type (Full_View (T)))
4505 -- Finally, a non-private subtype may have a private base type,
4506 -- which must be exchanged for consistency. This can happen when
4507 -- instantiating a package body, when the scope stack is empty
4508 -- but in fact the subtype and the base type are declared in an
4511 elsif not Is_Private_Type (T)
4512 and then not Has_Private_View (N)
4513 and then Is_Private_Type (Base_Type (T))
4514 and then Present (Full_View (BT))
4515 and then not Is_Generic_Type (BT)
4516 and then not In_Open_Scopes (BT)
4518 Append_Elmt (Full_View (BT), Exchanged_Views);
4519 Exchange_Declarations (BT);
4522 end Check_Private_View;
4524 --------------------------
4525 -- Contains_Instance_Of --
4526 --------------------------
4528 function Contains_Instance_Of
4531 N : Node_Id) return Boolean
4539 -- Verify that there are no circular instantiations. We check whether
4540 -- the unit contains an instance of the current scope or some enclosing
4541 -- scope (in case one of the instances appears in a subunit). Longer
4542 -- circularities involving subunits might seem too pathological to
4543 -- consider, but they were not too pathological for the authors of
4544 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4545 -- enclosing generic scopes as containing an instance.
4548 -- Within a generic subprogram body, the scope is not generic, to
4549 -- allow for recursive subprograms. Use the declaration to determine
4550 -- whether this is a generic unit.
4552 if Ekind (Scop) = E_Generic_Package
4553 or else (Is_Subprogram (Scop)
4554 and then Nkind (Unit_Declaration_Node (Scop)) =
4555 N_Generic_Subprogram_Declaration)
4557 Elmt := First_Elmt (Inner_Instances (Inner));
4559 while Present (Elmt) loop
4560 if Node (Elmt) = Scop then
4561 Error_Msg_Node_2 := Inner;
4563 ("circular Instantiation: & instantiated within &!",
4567 elsif Node (Elmt) = Inner then
4570 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4571 Error_Msg_Node_2 := Inner;
4573 ("circular Instantiation: & instantiated within &!",
4581 -- Indicate that Inner is being instantiated within Scop.
4583 Append_Elmt (Inner, Inner_Instances (Scop));
4586 if Scop = Standard_Standard then
4589 Scop := Scope (Scop);
4594 end Contains_Instance_Of;
4596 -----------------------
4597 -- Copy_Generic_Node --
4598 -----------------------
4600 function Copy_Generic_Node
4602 Parent_Id : Node_Id;
4603 Instantiating : Boolean) return Node_Id
4608 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4609 -- Check the given value of one of the Fields referenced by the
4610 -- current node to determine whether to copy it recursively. The
4611 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4612 -- value (Sloc, Uint, Char) in which case it need not be copied.
4614 procedure Copy_Descendants;
4615 -- Common utility for various nodes.
4617 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4618 -- Make copy of element list.
4620 function Copy_Generic_List
4622 Parent_Id : Node_Id) return List_Id;
4623 -- Apply Copy_Node recursively to the members of a node list.
4625 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4626 -- True if an identifier is part of the defining program unit name
4627 -- of a child unit. The entity of such an identifier must be kept
4628 -- (for ASIS use) even though as the name of an enclosing generic
4629 -- it would otherwise not be preserved in the generic tree.
4631 ----------------------
4632 -- Copy_Descendants --
4633 ----------------------
4635 procedure Copy_Descendants is
4637 use Atree.Unchecked_Access;
4638 -- This code section is part of the implementation of an untyped
4639 -- tree traversal, so it needs direct access to node fields.
4642 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4643 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4644 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4645 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4646 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4647 end Copy_Descendants;
4649 -----------------------------
4650 -- Copy_Generic_Descendant --
4651 -----------------------------
4653 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4655 if D = Union_Id (Empty) then
4658 elsif D in Node_Range then
4660 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4662 elsif D in List_Range then
4663 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4665 elsif D in Elist_Range then
4666 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4668 -- Nothing else is copyable (e.g. Uint values), return as is
4673 end Copy_Generic_Descendant;
4675 ------------------------
4676 -- Copy_Generic_Elist --
4677 ------------------------
4679 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4686 M := First_Elmt (E);
4687 while Present (M) loop
4689 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4698 end Copy_Generic_Elist;
4700 -----------------------
4701 -- Copy_Generic_List --
4702 -----------------------
4704 function Copy_Generic_List
4706 Parent_Id : Node_Id) return List_Id
4714 Set_Parent (New_L, Parent_Id);
4717 while Present (N) loop
4718 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4727 end Copy_Generic_List;
4729 ---------------------------
4730 -- In_Defining_Unit_Name --
4731 ---------------------------
4733 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4735 return Present (Parent (Nam))
4736 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4738 (Nkind (Parent (Nam)) = N_Expanded_Name
4739 and then In_Defining_Unit_Name (Parent (Nam))));
4740 end In_Defining_Unit_Name;
4742 -- Start of processing for Copy_Generic_Node
4749 New_N := New_Copy (N);
4751 if Instantiating then
4752 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4755 if not Is_List_Member (N) then
4756 Set_Parent (New_N, Parent_Id);
4759 -- If defining identifier, then all fields have been copied already
4761 if Nkind (New_N) in N_Entity then
4764 -- Special casing for identifiers and other entity names and operators
4766 elsif Nkind (New_N) = N_Identifier
4767 or else Nkind (New_N) = N_Character_Literal
4768 or else Nkind (New_N) = N_Expanded_Name
4769 or else Nkind (New_N) = N_Operator_Symbol
4770 or else Nkind (New_N) in N_Op
4772 if not Instantiating then
4774 -- Link both nodes in order to assign subsequently the
4775 -- entity of the copy to the original node, in case this
4776 -- is a global reference.
4778 Set_Associated_Node (N, New_N);
4780 -- If we are within an instantiation, this is a nested generic
4781 -- that has already been analyzed at the point of definition. We
4782 -- must preserve references that were global to the enclosing
4783 -- parent at that point. Other occurrences, whether global or
4784 -- local to the current generic, must be resolved anew, so we
4785 -- reset the entity in the generic copy. A global reference has
4786 -- a smaller depth than the parent, or else the same depth in
4787 -- case both are distinct compilation units.
4789 -- It is also possible for Current_Instantiated_Parent to be
4790 -- defined, and for this not to be a nested generic, namely
4791 -- if the unit is loaded through Rtsfind. In that case, the
4792 -- entity of New_N is only a link to the associated node, and
4793 -- not a defining occurrence.
4795 -- The entities for parent units in the defining_program_unit
4796 -- of a generic child unit are established when the context of
4797 -- the unit is first analyzed, before the generic copy is made.
4798 -- They are preserved in the copy for use in ASIS queries.
4800 Ent := Entity (New_N);
4802 if No (Current_Instantiated_Parent.Gen_Id) then
4804 or else Nkind (Ent) /= N_Defining_Identifier
4805 or else not In_Defining_Unit_Name (N)
4807 Set_Associated_Node (New_N, Empty);
4812 not (Nkind (Ent) = N_Defining_Identifier
4814 Nkind (Ent) = N_Defining_Character_Literal
4816 Nkind (Ent) = N_Defining_Operator_Symbol)
4817 or else No (Scope (Ent))
4818 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4819 or else (Scope_Depth (Scope (Ent)) >
4820 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4822 Get_Source_Unit (Ent) =
4823 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4825 Set_Associated_Node (New_N, Empty);
4828 -- Case of instantiating identifier or some other name or operator
4831 -- If the associated node is still defined, the entity in
4832 -- it is global, and must be copied to the instance.
4833 -- If this copy is being made for a body to inline, it is
4834 -- applied to an instantiated tree, and the entity is already
4835 -- present and must be also preserved.
4838 Assoc : constant Node_Id := Get_Associated_Node (N);
4840 if Present (Assoc) then
4841 if Nkind (Assoc) = Nkind (N) then
4842 Set_Entity (New_N, Entity (Assoc));
4843 Check_Private_View (N);
4845 elsif Nkind (Assoc) = N_Function_Call then
4846 Set_Entity (New_N, Entity (Name (Assoc)));
4848 elsif (Nkind (Assoc) = N_Defining_Identifier
4849 or else Nkind (Assoc) = N_Defining_Character_Literal
4850 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
4851 and then Expander_Active
4853 -- Inlining case: we are copying a tree that contains
4854 -- global entities, which are preserved in the copy
4855 -- to be used for subsequent inlining.
4860 Set_Entity (New_N, Empty);
4866 -- For expanded name, we must copy the Prefix and Selector_Name
4868 if Nkind (N) = N_Expanded_Name then
4870 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4872 Set_Selector_Name (New_N,
4873 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4875 -- For operators, we must copy the right operand
4877 elsif Nkind (N) in N_Op then
4878 Set_Right_Opnd (New_N,
4879 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4881 -- And for binary operators, the left operand as well
4883 if Nkind (N) in N_Binary_Op then
4884 Set_Left_Opnd (New_N,
4885 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4889 -- Special casing for stubs
4891 elsif Nkind (N) in N_Body_Stub then
4893 -- In any case, we must copy the specification or defining
4894 -- identifier as appropriate.
4896 if Nkind (N) = N_Subprogram_Body_Stub then
4897 Set_Specification (New_N,
4898 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4901 Set_Defining_Identifier (New_N,
4903 (Defining_Identifier (N), New_N, Instantiating));
4906 -- If we are not instantiating, then this is where we load and
4907 -- analyze subunits, i.e. at the point where the stub occurs. A
4908 -- more permissivle system might defer this analysis to the point
4909 -- of instantiation, but this seems to complicated for now.
4911 if not Instantiating then
4913 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4915 Unum : Unit_Number_Type;
4921 (Load_Name => Subunit_Name,
4926 -- If the proper body is not found, a warning message will
4927 -- be emitted when analyzing the stub, or later at the the
4928 -- point of instantiation. Here we just leave the stub as is.
4930 if Unum = No_Unit then
4931 Subunits_Missing := True;
4932 goto Subunit_Not_Found;
4935 Subunit := Cunit (Unum);
4937 if Nkind (Unit (Subunit)) /= N_Subunit then
4938 Error_Msg_Sloc := Sloc (N);
4940 ("expected SEPARATE subunit to complete stub at#,"
4941 & " found child unit", Subunit);
4942 goto Subunit_Not_Found;
4945 -- We must create a generic copy of the subunit, in order
4946 -- to perform semantic analysis on it, and we must replace
4947 -- the stub in the original generic unit with the subunit,
4948 -- in order to preserve non-local references within.
4950 -- Only the proper body needs to be copied. Library_Unit and
4951 -- context clause are simply inherited by the generic copy.
4952 -- Note that the copy (which may be recursive if there are
4953 -- nested subunits) must be done first, before attaching it
4954 -- to the enclosing generic.
4958 (Proper_Body (Unit (Subunit)),
4959 Empty, Instantiating => False);
4961 -- Now place the original proper body in the original
4962 -- generic unit. This is a body, not a compilation unit.
4964 Rewrite (N, Proper_Body (Unit (Subunit)));
4965 Set_Is_Compilation_Unit (Defining_Entity (N), False);
4966 Set_Was_Originally_Stub (N);
4968 -- Finally replace the body of the subunit with its copy,
4969 -- and make this new subunit into the library unit of the
4970 -- generic copy, which does not have stubs any longer.
4972 Set_Proper_Body (Unit (Subunit), New_Body);
4973 Set_Library_Unit (New_N, Subunit);
4974 Inherit_Context (Unit (Subunit), N);
4977 -- If we are instantiating, this must be an error case, since
4978 -- otherwise we would have replaced the stub node by the proper
4979 -- body that corresponds. So just ignore it in the copy (i.e.
4980 -- we have copied it, and that is good enough).
4986 <<Subunit_Not_Found>> null;
4988 -- If the node is a compilation unit, it is the subunit of a stub,
4989 -- which has been loaded already (see code below). In this case,
4990 -- the library unit field of N points to the parent unit (which
4991 -- is a compilation unit) and need not (and cannot!) be copied.
4993 -- When the proper body of the stub is analyzed, thie library_unit
4994 -- link is used to establish the proper context (see sem_ch10).
4996 -- The other fields of a compilation unit are copied as usual
4998 elsif Nkind (N) = N_Compilation_Unit then
5000 -- This code can only be executed when not instantiating, because
5001 -- in the copy made for an instantiation, the compilation unit
5002 -- node has disappeared at the point that a stub is replaced by
5005 pragma Assert (not Instantiating);
5007 Set_Context_Items (New_N,
5008 Copy_Generic_List (Context_Items (N), New_N));
5011 Copy_Generic_Node (Unit (N), New_N, False));
5013 Set_First_Inlined_Subprogram (New_N,
5015 (First_Inlined_Subprogram (N), New_N, False));
5017 Set_Aux_Decls_Node (New_N,
5018 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
5020 -- For an assignment node, the assignment is known to be semantically
5021 -- legal if we are instantiating the template. This avoids incorrect
5022 -- diagnostics in generated code.
5024 elsif Nkind (N) = N_Assignment_Statement then
5026 -- Copy name and expression fields in usual manner
5029 Copy_Generic_Node (Name (N), New_N, Instantiating));
5031 Set_Expression (New_N,
5032 Copy_Generic_Node (Expression (N), New_N, Instantiating));
5034 if Instantiating then
5035 Set_Assignment_OK (Name (New_N), True);
5038 elsif Nkind (N) = N_Aggregate
5039 or else Nkind (N) = N_Extension_Aggregate
5042 if not Instantiating then
5043 Set_Associated_Node (N, New_N);
5046 if Present (Get_Associated_Node (N))
5047 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
5049 -- In the generic the aggregate has some composite type. If at
5050 -- the point of instantiation the type has a private view,
5051 -- install the full view (and that of its ancestors, if any).
5054 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
5059 and then Is_Private_Type (T)
5065 and then Is_Tagged_Type (T)
5066 and then Is_Derived_Type (T)
5068 Rt := Root_Type (T);
5073 if Is_Private_Type (T) then
5084 -- Do not copy the associated node, which points to
5085 -- the generic copy of the aggregate.
5088 use Atree.Unchecked_Access;
5089 -- This code section is part of the implementation of an untyped
5090 -- tree traversal, so it needs direct access to node fields.
5093 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5094 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5095 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5096 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5099 -- Allocators do not have an identifier denoting the access type,
5100 -- so we must locate it through the expression to check whether
5101 -- the views are consistent.
5103 elsif Nkind (N) = N_Allocator
5104 and then Nkind (Expression (N)) = N_Qualified_Expression
5105 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
5106 and then Instantiating
5109 T : constant Node_Id :=
5110 Get_Associated_Node (Subtype_Mark (Expression (N)));
5115 -- Retrieve the allocator node in the generic copy.
5117 Acc_T := Etype (Parent (Parent (T)));
5119 and then Is_Private_Type (Acc_T)
5121 Switch_View (Acc_T);
5128 -- For a proper body, we must catch the case of a proper body that
5129 -- replaces a stub. This represents the point at which a separate
5130 -- compilation unit, and hence template file, may be referenced, so
5131 -- we must make a new source instantiation entry for the template
5132 -- of the subunit, and ensure that all nodes in the subunit are
5133 -- adjusted using this new source instantiation entry.
5135 elsif Nkind (N) in N_Proper_Body then
5137 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
5140 if Instantiating and then Was_Originally_Stub (N) then
5141 Create_Instantiation_Source
5142 (Instantiation_Node,
5143 Defining_Entity (N),
5148 -- Now copy the fields of the proper body, using the new
5149 -- adjustment factor if one was needed as per test above.
5153 -- Restore the original adjustment factor in case changed
5155 S_Adjustment := Save_Adjustment;
5158 -- Don't copy Ident or Comment pragmas, since the comment belongs
5159 -- to the generic unit, not to the instantiating unit.
5161 elsif Nkind (N) = N_Pragma
5162 and then Instantiating
5165 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
5168 if Prag_Id = Pragma_Ident
5169 or else Prag_Id = Pragma_Comment
5171 New_N := Make_Null_Statement (Sloc (N));
5178 elsif Nkind (N) = N_Integer_Literal
5179 or else Nkind (N) = N_Real_Literal
5181 -- No descendant fields need traversing
5185 -- For the remaining nodes, copy recursively their descendants
5191 and then Nkind (N) = N_Subprogram_Body
5193 Set_Generic_Parent (Specification (New_N), N);
5198 end Copy_Generic_Node;
5200 ----------------------------
5201 -- Denotes_Formal_Package --
5202 ----------------------------
5204 function Denotes_Formal_Package
5206 On_Exit : Boolean := False) return Boolean
5209 Scop : constant Entity_Id := Scope (Pack);
5216 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
5218 Par := Current_Instantiated_Parent.Act_Id;
5221 if Ekind (Scop) = E_Generic_Package
5222 or else Nkind (Unit_Declaration_Node (Scop)) =
5223 N_Generic_Subprogram_Declaration
5227 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
5234 -- Check whether this package is associated with a formal
5235 -- package of the enclosing instantiation. Iterate over the
5236 -- list of renamings.
5238 E := First_Entity (Par);
5239 while Present (E) loop
5240 if Ekind (E) /= E_Package
5241 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
5244 elsif Renamed_Object (E) = Par then
5247 elsif Renamed_Object (E) = Pack then
5256 end Denotes_Formal_Package;
5262 procedure End_Generic is
5264 -- ??? More things could be factored out in this
5265 -- routine. Should probably be done at a later stage.
5267 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
5268 Generic_Flags.Decrement_Last;
5270 Expander_Mode_Restore;
5273 ----------------------
5274 -- Find_Actual_Type --
5275 ----------------------
5277 function Find_Actual_Type
5279 Gen_Scope : Entity_Id) return Entity_Id
5284 if not Is_Child_Unit (Gen_Scope) then
5285 return Get_Instance_Of (Typ);
5287 elsif not Is_Generic_Type (Typ)
5288 or else Scope (Typ) = Gen_Scope
5290 return Get_Instance_Of (Typ);
5293 T := Current_Entity (Typ);
5294 while Present (T) loop
5295 if In_Open_Scopes (Scope (T)) then
5304 end Find_Actual_Type;
5306 ----------------------------
5307 -- Freeze_Subprogram_Body --
5308 ----------------------------
5310 procedure Freeze_Subprogram_Body
5311 (Inst_Node : Node_Id;
5313 Pack_Id : Entity_Id)
5316 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
5317 Par : constant Entity_Id := Scope (Gen_Unit);
5322 function Earlier (N1, N2 : Node_Id) return Boolean;
5323 -- Yields True if N1 and N2 appear in the same compilation unit,
5324 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5325 -- traversal of the tree for the unit.
5327 function Enclosing_Body (N : Node_Id) return Node_Id;
5328 -- Find innermost package body that encloses the given node, and which
5329 -- is not a compilation unit. Freeze nodes for the instance, or for its
5330 -- enclosing body, may be inserted after the enclosing_body of the
5333 function Package_Freeze_Node (B : Node_Id) return Node_Id;
5334 -- Find entity for given package body, and locate or create a freeze
5337 function True_Parent (N : Node_Id) return Node_Id;
5338 -- For a subunit, return parent of corresponding stub.
5344 function Earlier (N1, N2 : Node_Id) return Boolean is
5350 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
5351 -- Find distance from given node to enclosing compilation unit.
5357 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
5360 and then Nkind (P) /= N_Compilation_Unit
5362 P := True_Parent (P);
5367 -- Start of procesing for Earlier
5370 Find_Depth (P1, D1);
5371 Find_Depth (P2, D2);
5381 P1 := True_Parent (P1);
5386 P2 := True_Parent (P2);
5390 -- At this point P1 and P2 are at the same distance from the root.
5391 -- We examine their parents until we find a common declarative
5392 -- list, at which point we can establish their relative placement
5393 -- by comparing their ultimate slocs. If we reach the root,
5394 -- N1 and N2 do not descend from the same declarative list (e.g.
5395 -- one is nested in the declarative part and the other is in a block
5396 -- in the statement part) and the earlier one is already frozen.
5398 while not Is_List_Member (P1)
5399 or else not Is_List_Member (P2)
5400 or else List_Containing (P1) /= List_Containing (P2)
5402 P1 := True_Parent (P1);
5403 P2 := True_Parent (P2);
5405 if Nkind (Parent (P1)) = N_Subunit then
5406 P1 := Corresponding_Stub (Parent (P1));
5409 if Nkind (Parent (P2)) = N_Subunit then
5410 P2 := Corresponding_Stub (Parent (P2));
5419 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
5422 --------------------
5423 -- Enclosing_Body --
5424 --------------------
5426 function Enclosing_Body (N : Node_Id) return Node_Id is
5427 P : Node_Id := Parent (N);
5431 and then Nkind (Parent (P)) /= N_Compilation_Unit
5433 if Nkind (P) = N_Package_Body then
5435 if Nkind (Parent (P)) = N_Subunit then
5436 return Corresponding_Stub (Parent (P));
5442 P := True_Parent (P);
5448 -------------------------
5449 -- Package_Freeze_Node --
5450 -------------------------
5452 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5456 if Nkind (B) = N_Package_Body then
5457 Id := Corresponding_Spec (B);
5459 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5460 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5463 Ensure_Freeze_Node (Id);
5464 return Freeze_Node (Id);
5465 end Package_Freeze_Node;
5471 function True_Parent (N : Node_Id) return Node_Id is
5473 if Nkind (Parent (N)) = N_Subunit then
5474 return Parent (Corresponding_Stub (Parent (N)));
5480 -- Start of processing of Freeze_Subprogram_Body
5483 -- If the instance and the generic body appear within the same
5484 -- unit, and the instance preceeds the generic, the freeze node for
5485 -- the instance must appear after that of the generic. If the generic
5486 -- is nested within another instance I2, then current instance must
5487 -- be frozen after I2. In both cases, the freeze nodes are those of
5488 -- enclosing packages. Otherwise, the freeze node is placed at the end
5489 -- of the current declarative part.
5491 Enc_G := Enclosing_Body (Gen_Body);
5492 Enc_I := Enclosing_Body (Inst_Node);
5493 Ensure_Freeze_Node (Pack_Id);
5494 F_Node := Freeze_Node (Pack_Id);
5496 if Is_Generic_Instance (Par)
5497 and then Present (Freeze_Node (Par))
5499 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5501 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5503 -- The parent was a premature instantiation. Insert freeze
5504 -- node at the end the current declarative part.
5506 Insert_After_Last_Decl (Inst_Node, F_Node);
5509 Insert_After (Freeze_Node (Par), F_Node);
5512 -- The body enclosing the instance should be frozen after the body
5513 -- that includes the generic, because the body of the instance may
5514 -- make references to entities therein. If the two are not in the
5515 -- same declarative part, or if the one enclosing the instance is
5516 -- frozen already, freeze the instance at the end of the current
5517 -- declarative part.
5519 elsif Is_Generic_Instance (Par)
5520 and then Present (Freeze_Node (Par))
5521 and then Present (Enc_I)
5523 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5525 (Nkind (Enc_I) = N_Package_Body
5527 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5529 -- The enclosing package may contain several instances. Rather
5530 -- than computing the earliest point at which to insert its
5531 -- freeze node, we place it at the end of the declarative part
5532 -- of the parent of the generic.
5534 Insert_After_Last_Decl
5535 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5538 Insert_After_Last_Decl (Inst_Node, F_Node);
5540 elsif Present (Enc_G)
5541 and then Present (Enc_I)
5542 and then Enc_G /= Enc_I
5543 and then Earlier (Inst_Node, Gen_Body)
5545 if Nkind (Enc_G) = N_Package_Body then
5546 E_G_Id := Corresponding_Spec (Enc_G);
5547 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5549 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5552 -- Freeze package that encloses instance, and place node after
5553 -- package that encloses generic. If enclosing package is already
5554 -- frozen we have to assume it is at the proper place. This may
5555 -- be a potential ABE that requires dynamic checking.
5557 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5559 -- Freeze enclosing subunit before instance
5561 Ensure_Freeze_Node (E_G_Id);
5563 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5564 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5567 Insert_After_Last_Decl (Inst_Node, F_Node);
5570 -- If none of the above, insert freeze node at the end of the
5571 -- current declarative part.
5573 Insert_After_Last_Decl (Inst_Node, F_Node);
5575 end Freeze_Subprogram_Body;
5581 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5583 return Generic_Renamings.Table (E).Gen_Id;
5586 ---------------------
5587 -- Get_Instance_Of --
5588 ---------------------
5590 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5591 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5594 if Res /= Assoc_Null then
5595 return Generic_Renamings.Table (Res).Act_Id;
5597 -- On exit, entity is not instantiated: not a generic parameter,
5598 -- or else parameter of an inner generic unit.
5602 end Get_Instance_Of;
5604 ------------------------------------
5605 -- Get_Package_Instantiation_Node --
5606 ------------------------------------
5608 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5609 Decl : Node_Id := Unit_Declaration_Node (A);
5613 -- If the instantiation is a compilation unit that does not need a
5614 -- body then the instantiation node has been rewritten as a package
5615 -- declaration for the instance, and we return the original node.
5617 -- If it is a compilation unit and the instance node has not been
5618 -- rewritten, then it is still the unit of the compilation. Finally,
5619 -- if a body is present, this is a parent of the main unit whose body
5620 -- has been compiled for inlining purposes, and the instantiation node
5621 -- has been rewritten with the instance body.
5623 -- Otherwise the instantiation node appears after the declaration.
5624 -- If the entity is a formal package, the declaration may have been
5625 -- rewritten as a generic declaration (in the case of a formal with a
5626 -- box) or left as a formal package declaration if it has actuals, and
5627 -- is found with a forward search.
5629 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5630 if Nkind (Decl) = N_Package_Declaration
5631 and then Present (Corresponding_Body (Decl))
5633 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5636 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5637 return Original_Node (Decl);
5639 return Unit (Parent (Decl));
5642 elsif Nkind (Decl) = N_Generic_Package_Declaration
5643 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5645 return Original_Node (Decl);
5648 Inst := Next (Decl);
5649 while Nkind (Inst) /= N_Package_Instantiation
5650 and then Nkind (Inst) /= N_Formal_Package_Declaration
5657 end Get_Package_Instantiation_Node;
5659 ------------------------
5660 -- Has_Been_Exchanged --
5661 ------------------------
5663 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5664 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5667 while Present (Next) loop
5668 if Full_View (Node (Next)) = E then
5676 end Has_Been_Exchanged;
5682 function Hash (F : Entity_Id) return HTable_Range is
5684 return HTable_Range (F mod HTable_Size);
5687 ------------------------
5688 -- Hide_Current_Scope --
5689 ------------------------
5691 procedure Hide_Current_Scope is
5692 C : constant Entity_Id := Current_Scope;
5696 Set_Is_Hidden_Open_Scope (C);
5697 E := First_Entity (C);
5699 while Present (E) loop
5700 if Is_Immediately_Visible (E) then
5701 Set_Is_Immediately_Visible (E, False);
5702 Append_Elmt (E, Hidden_Entities);
5708 -- Make the scope name invisible as well. This is necessary, but
5709 -- might conflict with calls to Rtsfind later on, in case the scope
5710 -- is a predefined one. There is no clean solution to this problem, so
5711 -- for now we depend on the user not redefining Standard itself in one
5712 -- of the parent units.
5714 if Is_Immediately_Visible (C)
5715 and then C /= Standard_Standard
5717 Set_Is_Immediately_Visible (C, False);
5718 Append_Elmt (C, Hidden_Entities);
5721 end Hide_Current_Scope;
5727 procedure Init_Env is
5728 Saved : Instance_Env;
5731 Saved.Ada_Version := Ada_Version;
5732 Saved.Instantiated_Parent := Current_Instantiated_Parent;
5733 Saved.Exchanged_Views := Exchanged_Views;
5734 Saved.Hidden_Entities := Hidden_Entities;
5735 Saved.Current_Sem_Unit := Current_Sem_Unit;
5736 Instance_Envs.Increment_Last;
5737 Instance_Envs.Table (Instance_Envs.Last) := Saved;
5739 Exchanged_Views := New_Elmt_List;
5740 Hidden_Entities := New_Elmt_List;
5742 -- Make dummy entry for Instantiated parent. If generic unit is
5743 -- legal, this is set properly in Set_Instance_Env.
5745 Current_Instantiated_Parent :=
5746 (Current_Scope, Current_Scope, Assoc_Null);
5749 ------------------------------
5750 -- In_Same_Declarative_Part --
5751 ------------------------------
5753 function In_Same_Declarative_Part
5755 Inst : Node_Id) return Boolean
5757 Decls : constant Node_Id := Parent (F_Node);
5758 Nod : Node_Id := Parent (Inst);
5761 while Present (Nod) loop
5765 elsif Nkind (Nod) = N_Subprogram_Body
5766 or else Nkind (Nod) = N_Package_Body
5767 or else Nkind (Nod) = N_Task_Body
5768 or else Nkind (Nod) = N_Protected_Body
5769 or else Nkind (Nod) = N_Block_Statement
5773 elsif Nkind (Nod) = N_Subunit then
5774 Nod := Corresponding_Stub (Nod);
5776 elsif Nkind (Nod) = N_Compilation_Unit then
5779 Nod := Parent (Nod);
5784 end In_Same_Declarative_Part;
5786 ---------------------
5787 -- In_Main_Context --
5788 ---------------------
5790 function In_Main_Context (E : Entity_Id) return Boolean is
5796 if not Is_Compilation_Unit (E)
5797 or else Ekind (E) /= E_Package
5798 or else In_Private_Part (E)
5803 Context := Context_Items (Cunit (Main_Unit));
5805 Clause := First (Context);
5806 while Present (Clause) loop
5807 if Nkind (Clause) = N_With_Clause then
5808 Nam := Name (Clause);
5810 -- If the current scope is part of the context of the main unit,
5811 -- analysis of the corresponding with_clause is not complete, and
5812 -- the entity is not set. We use the Chars field directly, which
5813 -- might produce false positives in rare cases, but guarantees
5814 -- that we produce all the instance bodies we will need.
5816 if (Nkind (Nam) = N_Identifier
5817 and then Chars (Nam) = Chars (E))
5818 or else (Nkind (Nam) = N_Selected_Component
5819 and then Chars (Selector_Name (Nam)) = Chars (E))
5829 end In_Main_Context;
5831 ---------------------
5832 -- Inherit_Context --
5833 ---------------------
5835 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5836 Current_Context : List_Id;
5837 Current_Unit : Node_Id;
5842 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5844 -- The inherited context is attached to the enclosing compilation
5845 -- unit. This is either the main unit, or the declaration for the
5846 -- main unit (in case the instantation appears within the package
5847 -- declaration and the main unit is its body).
5849 Current_Unit := Parent (Inst);
5850 while Present (Current_Unit)
5851 and then Nkind (Current_Unit) /= N_Compilation_Unit
5853 Current_Unit := Parent (Current_Unit);
5856 Current_Context := Context_Items (Current_Unit);
5858 Item := First (Context_Items (Parent (Gen_Decl)));
5859 while Present (Item) loop
5860 if Nkind (Item) = N_With_Clause then
5861 New_I := New_Copy (Item);
5862 Set_Implicit_With (New_I, True);
5863 Append (New_I, Current_Context);
5869 end Inherit_Context;
5875 procedure Initialize is
5877 Generic_Renamings.Init;
5880 Generic_Renamings_HTable.Reset;
5881 Circularity_Detected := False;
5882 Exchanged_Views := No_Elist;
5883 Hidden_Entities := No_Elist;
5886 ----------------------------
5887 -- Insert_After_Last_Decl --
5888 ----------------------------
5890 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5891 L : List_Id := List_Containing (N);
5892 P : constant Node_Id := Parent (L);
5895 if not Is_List_Member (F_Node) then
5896 if Nkind (P) = N_Package_Specification
5897 and then L = Visible_Declarations (P)
5898 and then Present (Private_Declarations (P))
5899 and then not Is_Empty_List (Private_Declarations (P))
5901 L := Private_Declarations (P);
5904 Insert_After (Last (L), F_Node);
5906 end Insert_After_Last_Decl;
5912 procedure Install_Body
5913 (Act_Body : Node_Id;
5918 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
5919 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
5920 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
5921 Par : constant Entity_Id := Scope (Gen_Id);
5922 Gen_Unit : constant Node_Id :=
5923 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5924 Orig_Body : Node_Id := Gen_Body;
5926 Body_Unit : Node_Id;
5928 Must_Delay : Boolean;
5930 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5931 -- Find subprogram (if any) that encloses instance and/or generic body.
5933 function True_Sloc (N : Node_Id) return Source_Ptr;
5934 -- If the instance is nested inside a generic unit, the Sloc of the
5935 -- instance indicates the place of the original definition, not the
5936 -- point of the current enclosing instance. Pending a better usage of
5937 -- Slocs to indicate instantiation places, we determine the place of
5938 -- origin of a node by finding the maximum sloc of any ancestor node.
5939 -- Why is this not equivalent fo Top_Level_Location ???
5941 --------------------
5942 -- Enclosing_Subp --
5943 --------------------
5945 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5946 Scop : Entity_Id := Scope (Id);
5949 while Scop /= Standard_Standard
5950 and then not Is_Overloadable (Scop)
5952 Scop := Scope (Scop);
5962 function True_Sloc (N : Node_Id) return Source_Ptr is
5969 while Present (N1) and then N1 /= Act_Unit loop
5970 if Sloc (N1) > Res then
5980 -- Start of processing for Install_Body
5983 -- If the body is a subunit, the freeze point is the corresponding
5984 -- stub in the current compilation, not the subunit itself.
5986 if Nkind (Parent (Gen_Body)) = N_Subunit then
5987 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
5989 Orig_Body := Gen_Body;
5992 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
5994 -- If the instantiation and the generic definition appear in the
5995 -- same package declaration, this is an early instantiation.
5996 -- If they appear in the same declarative part, it is an early
5997 -- instantiation only if the generic body appears textually later,
5998 -- and the generic body is also in the main unit.
6000 -- If instance is nested within a subprogram, and the generic body is
6001 -- not, the instance is delayed because the enclosing body is. If
6002 -- instance and body are within the same scope, or the same sub-
6003 -- program body, indicate explicitly that the instance is delayed.
6006 (Gen_Unit = Act_Unit
6007 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
6008 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
6009 or else (Gen_Unit = Body_Unit
6010 and then True_Sloc (N) < Sloc (Orig_Body)))
6011 and then Is_In_Main_Unit (Gen_Unit)
6012 and then (Scope (Act_Id) = Scope (Gen_Id)
6014 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
6016 -- If this is an early instantiation, the freeze node is placed after
6017 -- the generic body. Otherwise, if the generic appears in an instance,
6018 -- we cannot freeze the current instance until the outer one is frozen.
6019 -- This is only relevant if the current instance is nested within some
6020 -- inner scope not itself within the outer instance. If this scope is
6021 -- a package body in the same declarative part as the outer instance,
6022 -- then that body needs to be frozen after the outer instance. Finally,
6023 -- if no delay is needed, we place the freeze node at the end of the
6024 -- current declarative part.
6026 if Expander_Active then
6027 Ensure_Freeze_Node (Act_Id);
6028 F_Node := Freeze_Node (Act_Id);
6031 Insert_After (Orig_Body, F_Node);
6033 elsif Is_Generic_Instance (Par)
6034 and then Present (Freeze_Node (Par))
6035 and then Scope (Act_Id) /= Par
6037 -- Freeze instance of inner generic after instance of enclosing
6040 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
6041 Insert_After (Freeze_Node (Par), F_Node);
6043 -- Freeze package enclosing instance of inner generic after
6044 -- instance of enclosing generic.
6046 elsif Nkind (Parent (N)) = N_Package_Body
6047 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
6051 Enclosing : constant Entity_Id :=
6052 Corresponding_Spec (Parent (N));
6055 Insert_After_Last_Decl (N, F_Node);
6056 Ensure_Freeze_Node (Enclosing);
6058 if not Is_List_Member (Freeze_Node (Enclosing)) then
6059 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
6064 Insert_After_Last_Decl (N, F_Node);
6068 Insert_After_Last_Decl (N, F_Node);
6072 Set_Is_Frozen (Act_Id);
6073 Insert_Before (N, Act_Body);
6074 Mark_Rewrite_Insertion (Act_Body);
6077 --------------------
6078 -- Install_Parent --
6079 --------------------
6081 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
6082 Ancestors : constant Elist_Id := New_Elmt_List;
6083 S : constant Entity_Id := Current_Scope;
6084 Inst_Par : Entity_Id;
6085 First_Par : Entity_Id;
6086 Inst_Node : Node_Id;
6087 Gen_Par : Entity_Id;
6088 First_Gen : Entity_Id;
6091 procedure Install_Formal_Packages (Par : Entity_Id);
6092 -- If any of the formals of the parent are formal packages with box,
6093 -- their formal parts are visible in the parent and thus in the child
6094 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6095 -- for the unit itself.
6097 procedure Install_Noninstance_Specs (Par : Entity_Id);
6098 -- Install the scopes of noninstance parent units ending with Par.
6100 procedure Install_Spec (Par : Entity_Id);
6101 -- The child unit is within the declarative part of the parent, so
6102 -- the declarations within the parent are immediately visible.
6104 -----------------------------
6105 -- Install_Formal_Packages --
6106 -----------------------------
6108 procedure Install_Formal_Packages (Par : Entity_Id) is
6112 E := First_Entity (Par);
6114 while Present (E) loop
6116 if Ekind (E) = E_Package
6117 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
6119 -- If this is the renaming for the parent instance, done.
6121 if Renamed_Object (E) = Par then
6124 -- The visibility of a formal of an enclosing generic is
6127 elsif Denotes_Formal_Package (E) then
6130 elsif Present (Associated_Formal_Package (E))
6131 and then Box_Present (Parent (Associated_Formal_Package (E)))
6133 Check_Generic_Actuals (Renamed_Object (E), True);
6134 Set_Is_Hidden (E, False);
6140 end Install_Formal_Packages;
6142 -------------------------------
6143 -- Install_Noninstance_Specs --
6144 -------------------------------
6146 procedure Install_Noninstance_Specs (Par : Entity_Id) is
6149 and then Par /= Standard_Standard
6150 and then not In_Open_Scopes (Par)
6152 Install_Noninstance_Specs (Scope (Par));
6155 end Install_Noninstance_Specs;
6161 procedure Install_Spec (Par : Entity_Id) is
6162 Spec : constant Node_Id :=
6163 Specification (Unit_Declaration_Node (Par));
6167 Set_Is_Immediately_Visible (Par);
6168 Install_Visible_Declarations (Par);
6169 Install_Private_Declarations (Par);
6170 Set_Use (Visible_Declarations (Spec));
6171 Set_Use (Private_Declarations (Spec));
6174 -- Start of processing for Install_Parent
6177 -- We need to install the parent instance to compile the instantiation
6178 -- of the child, but the child instance must appear in the current
6179 -- scope. Given that we cannot place the parent above the current
6180 -- scope in the scope stack, we duplicate the current scope and unstack
6181 -- both after the instantiation is complete.
6183 -- If the parent is itself the instantiation of a child unit, we must
6184 -- also stack the instantiation of its parent, and so on. Each such
6185 -- ancestor is the prefix of the name in a prior instantiation.
6187 -- If this is a nested instance, the parent unit itself resolves to
6188 -- a renaming of the parent instance, whose declaration we need.
6190 -- Finally, the parent may be a generic (not an instance) when the
6191 -- child unit appears as a formal package.
6195 if Present (Renamed_Entity (Inst_Par)) then
6196 Inst_Par := Renamed_Entity (Inst_Par);
6199 First_Par := Inst_Par;
6202 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
6204 First_Gen := Gen_Par;
6206 while Present (Gen_Par)
6207 and then Is_Child_Unit (Gen_Par)
6209 -- Load grandparent instance as well
6211 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
6213 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
6214 Inst_Par := Entity (Prefix (Name (Inst_Node)));
6216 if Present (Renamed_Entity (Inst_Par)) then
6217 Inst_Par := Renamed_Entity (Inst_Par);
6222 (Specification (Unit_Declaration_Node (Inst_Par)));
6224 if Present (Gen_Par) then
6225 Prepend_Elmt (Inst_Par, Ancestors);
6228 -- Parent is not the name of an instantiation
6230 Install_Noninstance_Specs (Inst_Par);
6242 if Present (First_Gen) then
6243 Append_Elmt (First_Par, Ancestors);
6246 Install_Noninstance_Specs (First_Par);
6249 if not Is_Empty_Elmt_List (Ancestors) then
6250 Elmt := First_Elmt (Ancestors);
6252 while Present (Elmt) loop
6253 Install_Spec (Node (Elmt));
6254 Install_Formal_Packages (Node (Elmt));
6265 --------------------------------
6266 -- Instantiate_Formal_Package --
6267 --------------------------------
6269 function Instantiate_Formal_Package
6272 Analyzed_Formal : Node_Id) return List_Id
6274 Loc : constant Source_Ptr := Sloc (Actual);
6275 Actual_Pack : Entity_Id;
6276 Formal_Pack : Entity_Id;
6277 Gen_Parent : Entity_Id;
6280 Parent_Spec : Node_Id;
6282 procedure Find_Matching_Actual
6284 Act : in out Entity_Id);
6285 -- We need to associate each formal entity in the formal package
6286 -- with the corresponding entity in the actual package. The actual
6287 -- package has been analyzed and possibly expanded, and as a result
6288 -- there is no one-to-one correspondence between the two lists (for
6289 -- example, the actual may include subtypes, itypes, and inherited
6290 -- primitive operations, interspersed among the renaming declarations
6291 -- for the actuals) . We retrieve the corresponding actual by name
6292 -- because each actual has the same name as the formal, and they do
6293 -- appear in the same order.
6295 function Formal_Entity
6297 Act_Ent : Entity_Id) return Entity_Id;
6298 -- Returns the entity associated with the given formal F. In the
6299 -- case where F is a formal package, this function will iterate
6300 -- through all of F's formals and enter map associations from the
6301 -- actuals occurring in the formal package's corresponding actual
6302 -- package (obtained via Act_Ent) to the formal package's formal
6303 -- parameters. This function is called recursively for arbitrary
6304 -- levels of formal packages.
6306 function Is_Instance_Of
6307 (Act_Spec : Entity_Id;
6308 Gen_Anc : Entity_Id) return Boolean;
6309 -- The actual can be an instantiation of a generic within another
6310 -- instance, in which case there is no direct link from it to the
6311 -- original generic ancestor. In that case, we recognize that the
6312 -- ultimate ancestor is the same by examining names and scopes.
6314 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
6315 -- Within the generic part, entities in the formal package are
6316 -- visible. To validate subsequent type declarations, indicate
6317 -- the correspondence betwen the entities in the analyzed formal,
6318 -- and the entities in the actual package. There are three packages
6319 -- involved in the instantiation of a formal package: the parent
6320 -- generic P1 which appears in the generic declaration, the fake
6321 -- instantiation P2 which appears in the analyzed generic, and whose
6322 -- visible entities may be used in subsequent formals, and the actual
6323 -- P3 in the instance. To validate subsequent formals, me indicate
6324 -- that the entities in P2 are mapped into those of P3. The mapping of
6325 -- entities has to be done recursively for nested packages.
6327 procedure Process_Nested_Formal (Formal : Entity_Id);
6328 -- If the current formal is declared with a box, its own formals are
6329 -- visible in the instance, as they were in the generic, and their
6330 -- Hidden flag must be reset. If some of these formals are themselves
6331 -- packages declared with a box, the processing must be recursive.
6333 --------------------------
6334 -- Find_Matching_Actual --
6335 --------------------------
6337 procedure Find_Matching_Actual
6339 Act : in out Entity_Id)
6341 Formal_Ent : Entity_Id;
6344 case Nkind (Original_Node (F)) is
6345 when N_Formal_Object_Declaration |
6346 N_Formal_Type_Declaration =>
6347 Formal_Ent := Defining_Identifier (F);
6349 while Chars (Act) /= Chars (Formal_Ent) loop
6353 when N_Formal_Subprogram_Declaration |
6354 N_Formal_Package_Declaration |
6355 N_Package_Declaration |
6356 N_Generic_Package_Declaration =>
6357 Formal_Ent := Defining_Entity (F);
6359 while Chars (Act) /= Chars (Formal_Ent) loop
6364 raise Program_Error;
6366 end Find_Matching_Actual;
6372 function Formal_Entity
6374 Act_Ent : Entity_Id) return Entity_Id
6376 Orig_Node : Node_Id := F;
6377 Act_Pkg : Entity_Id;
6380 case Nkind (Original_Node (F)) is
6381 when N_Formal_Object_Declaration =>
6382 return Defining_Identifier (F);
6384 when N_Formal_Type_Declaration =>
6385 return Defining_Identifier (F);
6387 when N_Formal_Subprogram_Declaration =>
6388 return Defining_Unit_Name (Specification (F));
6390 when N_Package_Declaration =>
6391 return Defining_Unit_Name (Specification (F));
6393 when N_Formal_Package_Declaration |
6394 N_Generic_Package_Declaration =>
6396 if Nkind (F) = N_Generic_Package_Declaration then
6397 Orig_Node := Original_Node (F);
6402 -- Find matching actual package, skipping over itypes and
6403 -- other entities generated when analyzing the formal. We
6404 -- know that if the instantiation is legal then there is
6405 -- a matching package for the formal.
6407 while Ekind (Act_Pkg) /= E_Package loop
6408 Act_Pkg := Next_Entity (Act_Pkg);
6412 Actual_Ent : Entity_Id := First_Entity (Act_Pkg);
6413 Formal_Node : Node_Id;
6414 Formal_Ent : Entity_Id;
6416 Gen_Decl : constant Node_Id :=
6417 Unit_Declaration_Node
6418 (Entity (Name (Orig_Node)));
6420 Formals : constant List_Id :=
6421 Generic_Formal_Declarations (Gen_Decl);
6424 if Present (Formals) then
6425 Formal_Node := First_Non_Pragma (Formals);
6427 Formal_Node := Empty;
6430 while Present (Actual_Ent)
6431 and then Present (Formal_Node)
6432 and then Actual_Ent /= First_Private_Entity (Act_Ent)
6434 -- ??? Are the following calls also needed here:
6436 -- Set_Is_Hidden (Actual_Ent, False);
6437 -- Set_Is_Potentially_Use_Visible
6438 -- (Actual_Ent, In_Use (Act_Ent));
6440 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6441 if Present (Formal_Ent) then
6442 Set_Instance_Of (Formal_Ent, Actual_Ent);
6444 Next_Non_Pragma (Formal_Node);
6446 Next_Entity (Actual_Ent);
6450 return Defining_Identifier (Orig_Node);
6452 when N_Use_Package_Clause =>
6455 when N_Use_Type_Clause =>
6458 -- We return Empty for all other encountered forms of
6459 -- declarations because there are some cases of nonformal
6460 -- sorts of declaration that can show up (e.g., when array
6461 -- formals are present). Since it's not clear what kinds
6462 -- can appear among the formals, we won't raise failure here.
6470 --------------------
6471 -- Is_Instance_Of --
6472 --------------------
6474 function Is_Instance_Of
6475 (Act_Spec : Entity_Id;
6476 Gen_Anc : Entity_Id) return Boolean
6478 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
6481 if No (Gen_Par) then
6484 -- Simplest case: the generic parent of the actual is the formal.
6486 elsif Gen_Par = Gen_Anc then
6489 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
6492 -- The actual may be obtained through several instantiations. Its
6493 -- scope must itself be an instance of a generic declared in the
6494 -- same scope as the formal. Any other case is detected above.
6496 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
6500 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
6508 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
6513 Set_Instance_Of (Form, Act);
6515 -- Traverse formal and actual package to map the corresponding
6516 -- entities. We skip over internal entities that may be generated
6517 -- during semantic analysis, and find the matching entities by
6518 -- name, given that they must appear in the same order.
6520 E1 := First_Entity (Form);
6521 E2 := First_Entity (Act);
6523 and then E1 /= First_Private_Entity (Form)
6525 if not Is_Internal (E1)
6526 and then not Is_Class_Wide_Type (E1)
6527 and then Present (Parent (E1))
6530 and then Chars (E2) /= Chars (E1)
6538 Set_Instance_Of (E1, E2);
6541 and then Is_Tagged_Type (E2)
6544 (Class_Wide_Type (E1), Class_Wide_Type (E2));
6547 if Ekind (E1) = E_Package
6548 and then No (Renamed_Object (E1))
6550 Map_Entities (E1, E2);
6559 ---------------------------
6560 -- Process_Nested_Formal --
6561 ---------------------------
6563 procedure Process_Nested_Formal (Formal : Entity_Id) is
6567 if Present (Associated_Formal_Package (Formal))
6568 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
6570 Ent := First_Entity (Formal);
6571 while Present (Ent) loop
6572 Set_Is_Hidden (Ent, False);
6573 Set_Is_Potentially_Use_Visible
6574 (Ent, Is_Potentially_Use_Visible (Formal));
6576 if Ekind (Ent) = E_Package then
6577 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
6578 Process_Nested_Formal (Ent);
6584 end Process_Nested_Formal;
6586 -- Start of processing for Instantiate_Formal_Package
6591 if not Is_Entity_Name (Actual)
6592 or else Ekind (Entity (Actual)) /= E_Package
6595 ("expect package instance to instantiate formal", Actual);
6596 Abandon_Instantiation (Actual);
6597 raise Program_Error;
6600 Actual_Pack := Entity (Actual);
6601 Set_Is_Instantiated (Actual_Pack);
6603 -- The actual may be a renamed package, or an outer generic
6604 -- formal package whose instantiation is converted into a renaming.
6606 if Present (Renamed_Object (Actual_Pack)) then
6607 Actual_Pack := Renamed_Object (Actual_Pack);
6610 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
6611 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
6612 Formal_Pack := Defining_Identifier (Analyzed_Formal);
6615 Generic_Parent (Specification (Analyzed_Formal));
6617 Defining_Unit_Name (Specification (Analyzed_Formal));
6620 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
6621 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
6623 Parent_Spec := Parent (Actual_Pack);
6626 if Gen_Parent = Any_Id then
6628 ("previous error in declaration of formal package", Actual);
6629 Abandon_Instantiation (Actual);
6632 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
6638 ("actual parameter must be instance of&", Actual, Gen_Parent);
6639 Abandon_Instantiation (Actual);
6642 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
6643 Map_Entities (Formal_Pack, Actual_Pack);
6646 Make_Package_Renaming_Declaration (Loc,
6647 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
6648 Name => New_Reference_To (Actual_Pack, Loc));
6650 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
6651 Defining_Identifier (Formal));
6652 Decls := New_List (Nod);
6654 -- If the formal F has a box, then the generic declarations are
6655 -- visible in the generic G. In an instance of G, the corresponding
6656 -- entities in the actual for F (which are the actuals for the
6657 -- instantiation of the generic that F denotes) must also be made
6658 -- visible for analysis of the current instance. On exit from the
6659 -- current instance, those entities are made private again. If the
6660 -- actual is currently in use, these entities are also use-visible.
6662 -- The loop through the actual entities also steps through the
6663 -- formal entities and enters associations from formals to
6664 -- actuals into the renaming map. This is necessary to properly
6665 -- handle checking of actual parameter associations for later
6666 -- formals that depend on actuals declared in the formal package.
6668 if Box_Present (Formal) then
6670 Gen_Decl : constant Node_Id :=
6671 Unit_Declaration_Node (Gen_Parent);
6672 Formals : constant List_Id :=
6673 Generic_Formal_Declarations (Gen_Decl);
6674 Actual_Ent : Entity_Id;
6675 Formal_Node : Node_Id;
6676 Formal_Ent : Entity_Id;
6679 if Present (Formals) then
6680 Formal_Node := First_Non_Pragma (Formals);
6682 Formal_Node := Empty;
6685 Actual_Ent := First_Entity (Actual_Pack);
6687 while Present (Actual_Ent)
6688 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6690 Set_Is_Hidden (Actual_Ent, False);
6691 Set_Is_Potentially_Use_Visible
6692 (Actual_Ent, In_Use (Actual_Pack));
6694 if Ekind (Actual_Ent) = E_Package then
6695 Process_Nested_Formal (Actual_Ent);
6698 if Present (Formal_Node) then
6699 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6701 if Present (Formal_Ent) then
6702 Find_Matching_Actual (Formal_Node, Actual_Ent);
6703 Set_Instance_Of (Formal_Ent, Actual_Ent);
6706 Next_Non_Pragma (Formal_Node);
6709 -- No further formals to match, but the generic
6710 -- part may contain inherited operation that are
6711 -- not hidden in the enclosing instance.
6713 Next_Entity (Actual_Ent);
6719 -- If the formal is not declared with a box, reanalyze it as
6720 -- an instantiation, to verify the matching rules of 12.7. The
6721 -- actual checks are performed after the generic associations
6726 I_Pack : constant Entity_Id :=
6727 Make_Defining_Identifier (Sloc (Actual),
6728 Chars => New_Internal_Name ('P'));
6731 Set_Is_Internal (I_Pack);
6734 Make_Package_Instantiation (Sloc (Actual),
6735 Defining_Unit_Name => I_Pack,
6736 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6737 Generic_Associations =>
6738 Generic_Associations (Formal)));
6744 end Instantiate_Formal_Package;
6746 -----------------------------------
6747 -- Instantiate_Formal_Subprogram --
6748 -----------------------------------
6750 function Instantiate_Formal_Subprogram
6753 Analyzed_Formal : Node_Id) return Node_Id
6755 Loc : Source_Ptr := Sloc (Instantiation_Node);
6756 Formal_Sub : constant Entity_Id :=
6757 Defining_Unit_Name (Specification (Formal));
6758 Analyzed_S : constant Entity_Id :=
6759 Defining_Unit_Name (Specification (Analyzed_Formal));
6760 Decl_Node : Node_Id;
6764 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6765 -- If the generic is a child unit, the parent has been installed
6766 -- on the scope stack, but a default subprogram cannot resolve to
6767 -- something on the parent because that parent is not really part
6768 -- of the visible context (it is there to resolve explicit local
6769 -- entities). If the default has resolved in this way, we remove
6770 -- the entity from immediate visibility and analyze the node again
6771 -- to emit an error message or find another visible candidate.
6773 procedure Valid_Actual_Subprogram (Act : Node_Id);
6774 -- Perform legality check and raise exception on failure.
6776 -----------------------
6777 -- From_Parent_Scope --
6778 -----------------------
6780 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6781 Gen_Scope : Node_Id := Scope (Analyzed_S);
6784 while Present (Gen_Scope)
6785 and then Is_Child_Unit (Gen_Scope)
6787 if Scope (Subp) = Scope (Gen_Scope) then
6791 Gen_Scope := Scope (Gen_Scope);
6795 end From_Parent_Scope;
6797 -----------------------------
6798 -- Valid_Actual_Subprogram --
6799 -----------------------------
6801 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6802 Act_E : Entity_Id := Empty;
6805 if Is_Entity_Name (Act) then
6806 Act_E := Entity (Act);
6807 elsif Nkind (Act) = N_Selected_Component
6808 and then Is_Entity_Name (Selector_Name (Act))
6810 Act_E := Entity (Selector_Name (Act));
6813 if (Present (Act_E) and then Is_Overloadable (Act_E))
6814 or else Nkind (Act) = N_Attribute_Reference
6815 or else Nkind (Act) = N_Indexed_Component
6816 or else Nkind (Act) = N_Character_Literal
6817 or else Nkind (Act) = N_Explicit_Dereference
6823 ("expect subprogram or entry name in instantiation of&",
6824 Instantiation_Node, Formal_Sub);
6825 Abandon_Instantiation (Instantiation_Node);
6827 end Valid_Actual_Subprogram;
6829 -- Start of processing for Instantiate_Formal_Subprogram
6832 New_Spec := New_Copy_Tree (Specification (Formal));
6834 -- Create new entity for the actual (New_Copy_Tree does not).
6836 Set_Defining_Unit_Name
6837 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6839 -- Find entity of actual. If the actual is an attribute reference, it
6840 -- cannot be resolved here (its formal is missing) but is handled
6841 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6842 -- fully resolved subsequently, when the renaming declaration for the
6843 -- formal is analyzed. If it is an explicit dereference, resolve the
6844 -- prefix but not the actual itself, to prevent interpretation as a
6847 if Present (Actual) then
6848 Loc := Sloc (Actual);
6849 Set_Sloc (New_Spec, Loc);
6851 if Nkind (Actual) = N_Operator_Symbol then
6852 Find_Direct_Name (Actual);
6854 elsif Nkind (Actual) = N_Explicit_Dereference then
6855 Analyze (Prefix (Actual));
6857 elsif Nkind (Actual) /= N_Attribute_Reference then
6861 Valid_Actual_Subprogram (Actual);
6864 elsif Present (Default_Name (Formal)) then
6865 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6866 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6867 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6868 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6869 and then Present (Entity (Default_Name (Formal)))
6871 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6873 Nam := New_Copy (Default_Name (Formal));
6874 Set_Sloc (Nam, Loc);
6877 elsif Box_Present (Formal) then
6879 -- Actual is resolved at the point of instantiation. Create
6880 -- an identifier or operator with the same name as the formal.
6882 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6883 Nam := Make_Operator_Symbol (Loc,
6884 Chars => Chars (Formal_Sub),
6885 Strval => No_String);
6887 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6891 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
6893 ("missing actual&", Instantiation_Node, Formal_Sub);
6895 ("\in instantiation of & declared#",
6896 Instantiation_Node, Scope (Analyzed_S));
6897 Abandon_Instantiation (Instantiation_Node);
6901 Make_Subprogram_Renaming_Declaration (Loc,
6902 Specification => New_Spec,
6905 -- If we do not have an actual and the formal specified <> then
6906 -- set to get proper default.
6908 if No (Actual) and then Box_Present (Formal) then
6909 Set_From_Default (Decl_Node);
6912 -- Gather possible interpretations for the actual before analyzing the
6913 -- instance. If overloaded, it will be resolved when analyzing the
6914 -- renaming declaration.
6916 if Box_Present (Formal)
6917 and then No (Actual)
6921 if Is_Child_Unit (Scope (Analyzed_S))
6922 and then Present (Entity (Nam))
6924 if not Is_Overloaded (Nam) then
6926 if From_Parent_Scope (Entity (Nam)) then
6927 Set_Is_Immediately_Visible (Entity (Nam), False);
6928 Set_Entity (Nam, Empty);
6929 Set_Etype (Nam, Empty);
6933 Set_Is_Immediately_Visible (Entity (Nam));
6942 Get_First_Interp (Nam, I, It);
6944 while Present (It.Nam) loop
6945 if From_Parent_Scope (It.Nam) then
6949 Get_Next_Interp (I, It);
6956 -- The generic instantiation freezes the actual. This can only be
6957 -- done once the actual is resolved, in the analysis of the renaming
6958 -- declaration. To indicate that must be done, we set the corresponding
6959 -- spec of the node to point to the formal subprogram entity.
6961 Set_Corresponding_Spec (Decl_Node, Analyzed_S);
6963 -- We cannot analyze the renaming declaration, and thus find the
6964 -- actual, until the all the actuals are assembled in the instance.
6965 -- For subsequent checks of other actuals, indicate the node that
6966 -- will hold the instance of this formal.
6968 Set_Instance_Of (Analyzed_S, Nam);
6970 if Nkind (Actual) = N_Selected_Component
6971 and then Is_Task_Type (Etype (Prefix (Actual)))
6972 and then not Is_Frozen (Etype (Prefix (Actual)))
6974 -- The renaming declaration will create a body, which must appear
6975 -- outside of the instantiation, We move the renaming declaration
6976 -- out of the instance, and create an additional renaming inside,
6977 -- to prevent freezing anomalies.
6980 Anon_Id : constant Entity_Id :=
6981 Make_Defining_Identifier
6982 (Loc, New_Internal_Name ('E'));
6984 Set_Defining_Unit_Name (New_Spec, Anon_Id);
6985 Insert_Before (Instantiation_Node, Decl_Node);
6986 Analyze (Decl_Node);
6988 -- Now create renaming within the instance
6991 Make_Subprogram_Renaming_Declaration (Loc,
6992 Specification => New_Copy_Tree (New_Spec),
6993 Name => New_Occurrence_Of (Anon_Id, Loc));
6995 Set_Defining_Unit_Name (Specification (Decl_Node),
6996 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7001 end Instantiate_Formal_Subprogram;
7003 ------------------------
7004 -- Instantiate_Object --
7005 ------------------------
7007 function Instantiate_Object
7010 Analyzed_Formal : Node_Id) return List_Id
7012 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
7013 Type_Id : constant Node_Id := Subtype_Mark (Formal);
7014 Loc : constant Source_Ptr := Sloc (Actual);
7015 Act_Assoc : constant Node_Id := Parent (Actual);
7016 Orig_Ftyp : constant Entity_Id :=
7017 Etype (Defining_Identifier (Analyzed_Formal));
7018 List : constant List_Id := New_List;
7020 Decl_Node : Node_Id;
7021 Subt_Decl : Node_Id := Empty;
7024 -- Sloc for error message on missing actual.
7025 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
7027 if Get_Instance_Of (Formal_Id) /= Formal_Id then
7028 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
7031 Set_Parent (List, Parent (Actual));
7035 if Out_Present (Formal) then
7037 -- An IN OUT generic actual must be a name. The instantiation is
7038 -- a renaming declaration. The actual is the name being renamed.
7039 -- We use the actual directly, rather than a copy, because it is not
7040 -- used further in the list of actuals, and because a copy or a use
7041 -- of relocate_node is incorrect if the instance is nested within
7042 -- a generic. In order to simplify ASIS searches, the Generic_Parent
7043 -- field links the declaration to the generic association.
7048 Instantiation_Node, Formal_Id);
7050 ("\in instantiation of & declared#",
7052 Scope (Defining_Identifier (Analyzed_Formal)));
7053 Abandon_Instantiation (Instantiation_Node);
7057 Make_Object_Renaming_Declaration (Loc,
7058 Defining_Identifier => New_Copy (Formal_Id),
7059 Subtype_Mark => New_Copy_Tree (Type_Id),
7062 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
7064 -- The analysis of the actual may produce insert_action nodes, so
7065 -- the declaration must have a context in which to attach them.
7067 Append (Decl_Node, List);
7070 -- This check is performed here because Analyze_Object_Renaming
7071 -- will not check it when Comes_From_Source is False. Note
7072 -- though that the check for the actual being the name of an
7073 -- object will be performed in Analyze_Object_Renaming.
7075 if Is_Object_Reference (Actual)
7076 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
7079 ("illegal discriminant-dependent component for in out parameter",
7083 -- The actual has to be resolved in order to check that it is
7084 -- a variable (due to cases such as F(1), where F returns
7085 -- access to an array, and for overloaded prefixes).
7088 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
7090 if Is_Private_Type (Ftyp)
7091 and then not Is_Private_Type (Etype (Actual))
7092 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
7093 or else Base_Type (Etype (Actual)) = Ftyp)
7095 -- If the actual has the type of the full view of the formal,
7096 -- or else a non-private subtype of the formal, then
7097 -- the visibility of the formal type has changed. Add to the
7098 -- actuals a subtype declaration that will force the exchange
7099 -- of views in the body of the instance as well.
7102 Make_Subtype_Declaration (Loc,
7103 Defining_Identifier =>
7104 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
7105 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
7107 Prepend (Subt_Decl, List);
7109 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
7110 Exchange_Declarations (Ftyp);
7113 Resolve (Actual, Ftyp);
7115 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
7117 ("actual for& must be a variable", Actual, Formal_Id);
7119 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
7121 "type of actual does not match type of&", Actual, Formal_Id);
7125 Note_Possible_Modification (Actual);
7127 -- Check for instantiation of atomic/volatile actual for
7128 -- non-atomic/volatile formal (RM C.6 (12)).
7130 if Is_Atomic_Object (Actual)
7131 and then not Is_Atomic (Orig_Ftyp)
7134 ("cannot instantiate non-atomic formal object " &
7135 "with atomic actual", Actual);
7137 elsif Is_Volatile_Object (Actual)
7138 and then not Is_Volatile (Orig_Ftyp)
7141 ("cannot instantiate non-volatile formal object " &
7142 "with volatile actual", Actual);
7148 -- The instantiation of a generic formal in-parameter
7149 -- is a constant declaration. The actual is the expression for
7150 -- that declaration.
7152 if Present (Actual) then
7154 Decl_Node := Make_Object_Declaration (Loc,
7155 Defining_Identifier => New_Copy (Formal_Id),
7156 Constant_Present => True,
7157 Object_Definition => New_Copy_Tree (Type_Id),
7158 Expression => Actual);
7160 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
7162 -- A generic formal object of a tagged type is defined
7163 -- to be aliased so the new constant must also be treated
7167 (Etype (Defining_Identifier (Analyzed_Formal)))
7169 Set_Aliased_Present (Decl_Node);
7172 Append (Decl_Node, List);
7174 -- No need to repeat (pre-)analysis of some expression nodes
7175 -- already handled in Pre_Analyze_Actuals.
7177 if Nkind (Actual) /= N_Allocator then
7182 Typ : constant Entity_Id :=
7184 (Etype (Defining_Identifier (Analyzed_Formal)));
7187 Freeze_Before (Instantiation_Node, Typ);
7189 -- If the actual is an aggregate, perform name resolution
7190 -- on its components (the analysis of an aggregate does not
7191 -- do it) to capture local names that may be hidden if the
7192 -- generic is a child unit.
7194 if Nkind (Actual) = N_Aggregate then
7195 Pre_Analyze_And_Resolve (Actual, Typ);
7199 elsif Present (Expression (Formal)) then
7201 -- Use default to construct declaration.
7204 Make_Object_Declaration (Sloc (Formal),
7205 Defining_Identifier => New_Copy (Formal_Id),
7206 Constant_Present => True,
7207 Object_Definition => New_Copy (Type_Id),
7208 Expression => New_Copy_Tree (Expression (Formal)));
7210 Append (Decl_Node, List);
7211 Set_Analyzed (Expression (Decl_Node), False);
7216 Instantiation_Node, Formal_Id);
7217 Error_Msg_NE ("\in instantiation of & declared#",
7219 Scope (Defining_Identifier (Analyzed_Formal)));
7222 (Etype (Defining_Identifier (Analyzed_Formal)))
7224 -- Create dummy constant declaration so that instance can
7225 -- be analyzed, to minimize cascaded visibility errors.
7228 Make_Object_Declaration (Loc,
7229 Defining_Identifier => New_Copy (Formal_Id),
7230 Constant_Present => True,
7231 Object_Definition => New_Copy (Type_Id),
7233 Make_Attribute_Reference (Sloc (Formal_Id),
7234 Attribute_Name => Name_First,
7235 Prefix => New_Copy (Type_Id)));
7237 Append (Decl_Node, List);
7240 Abandon_Instantiation (Instantiation_Node);
7247 end Instantiate_Object;
7249 ------------------------------
7250 -- Instantiate_Package_Body --
7251 ------------------------------
7253 procedure Instantiate_Package_Body
7254 (Body_Info : Pending_Body_Info;
7255 Inlined_Body : Boolean := False)
7257 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7258 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7259 Loc : constant Source_Ptr := Sloc (Inst_Node);
7261 Gen_Id : constant Node_Id := Name (Inst_Node);
7262 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7263 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7264 Act_Spec : constant Node_Id := Specification (Act_Decl);
7265 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
7267 Act_Body_Name : Node_Id;
7269 Gen_Body_Id : Node_Id;
7271 Act_Body_Id : Entity_Id;
7273 Parent_Installed : Boolean := False;
7274 Save_Style_Check : constant Boolean := Style_Check;
7277 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7279 -- The instance body may already have been processed, as the parent
7280 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7282 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
7286 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7288 if No (Gen_Body_Id) then
7289 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7290 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7293 -- Establish global variable for sloc adjustment and for error
7296 Instantiation_Node := Inst_Node;
7298 if Present (Gen_Body_Id) then
7299 Save_Env (Gen_Unit, Act_Decl_Id);
7300 Style_Check := False;
7301 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7303 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7305 Create_Instantiation_Source
7306 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
7310 (Original_Node (Gen_Body), Empty, Instantiating => True);
7312 -- Build new name (possibly qualified) for body declaration
7314 Act_Body_Id := New_Copy (Act_Decl_Id);
7316 -- Some attributes of the spec entity are not inherited by the
7319 Set_Handler_Records (Act_Body_Id, No_List);
7321 if Nkind (Defining_Unit_Name (Act_Spec)) =
7322 N_Defining_Program_Unit_Name
7325 Make_Defining_Program_Unit_Name (Loc,
7326 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
7327 Defining_Identifier => Act_Body_Id);
7329 Act_Body_Name := Act_Body_Id;
7332 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
7334 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
7335 Check_Generic_Actuals (Act_Decl_Id, False);
7337 -- If it is a child unit, make the parent instance (which is an
7338 -- instance of the parent of the generic) visible. The parent
7339 -- instance is the prefix of the name of the generic unit.
7341 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7342 and then Nkind (Gen_Id) = N_Expanded_Name
7344 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7345 Parent_Installed := True;
7347 elsif Is_Child_Unit (Gen_Unit) then
7348 Install_Parent (Scope (Gen_Unit), In_Body => True);
7349 Parent_Installed := True;
7352 -- If the instantiation is a library unit, and this is the main
7353 -- unit, then build the resulting compilation unit nodes for the
7354 -- instance. If this is a compilation unit but it is not the main
7355 -- unit, then it is the body of a unit in the context, that is being
7356 -- compiled because it is encloses some inlined unit or another
7357 -- generic unit being instantiated. In that case, this body is not
7358 -- part of the current compilation, and is not attached to the tree,
7359 -- but its parent must be set for analysis.
7361 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7363 -- Replace instance node with body of instance, and create
7364 -- new node for corresponding instance declaration.
7366 Build_Instance_Compilation_Unit_Nodes
7367 (Inst_Node, Act_Body, Act_Decl);
7368 Analyze (Inst_Node);
7370 if Parent (Inst_Node) = Cunit (Main_Unit) then
7372 -- If the instance is a child unit itself, then set the
7373 -- scope of the expanded body to be the parent of the
7374 -- instantiation (ensuring that the fully qualified name
7375 -- will be generated for the elaboration subprogram).
7377 if Nkind (Defining_Unit_Name (Act_Spec)) =
7378 N_Defining_Program_Unit_Name
7381 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
7385 -- Case where instantiation is not a library unit
7388 -- If this is an early instantiation, i.e. appears textually
7389 -- before the corresponding body and must be elaborated first,
7390 -- indicate that the body instance is to be delayed.
7392 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
7394 -- Now analyze the body. We turn off all checks if this is
7395 -- an internal unit, since there is no reason to have checks
7396 -- on for any predefined run-time library code. All such
7397 -- code is designed to be compiled with checks off.
7399 -- Note that we do NOT apply this criterion to children of
7400 -- GNAT (or on VMS, children of DEC). The latter units must
7401 -- suppress checks explicitly if this is needed.
7403 if Is_Predefined_File_Name
7404 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
7406 Analyze (Act_Body, Suppress => All_Checks);
7412 if not Generic_Separately_Compiled (Gen_Unit) then
7413 Inherit_Context (Gen_Body, Inst_Node);
7416 -- Remove the parent instances if they have been placed on the
7417 -- scope stack to compile the body.
7419 if Parent_Installed then
7420 Remove_Parent (In_Body => True);
7423 Restore_Private_Views (Act_Decl_Id);
7425 -- Remove the current unit from visibility if this is an instance
7426 -- that is not elaborated on the fly for inlining purposes.
7428 if not Inlined_Body then
7429 Set_Is_Immediately_Visible (Act_Decl_Id, False);
7433 Style_Check := Save_Style_Check;
7435 -- If we have no body, and the unit requires a body, then complain.
7436 -- This complaint is suppressed if we have detected other errors
7437 -- (since a common reason for missing the body is that it had errors).
7439 elsif Unit_Requires_Body (Gen_Unit) then
7440 if Serious_Errors_Detected = 0 then
7442 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
7444 -- Don't attempt to perform any cleanup actions if some other
7445 -- error was aready detected, since this can cause blowups.
7451 -- Case of package that does not need a body
7454 -- If the instantiation of the declaration is a library unit,
7455 -- rewrite the original package instantiation as a package
7456 -- declaration in the compilation unit node.
7458 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7459 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
7460 Rewrite (Inst_Node, Act_Decl);
7462 -- Generate elaboration entity, in case spec has elaboration
7463 -- code. This cannot be done when the instance is analyzed,
7464 -- because it is not known yet whether the body exists.
7466 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
7467 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
7469 -- If the instantiation is not a library unit, then append the
7470 -- declaration to the list of implicitly generated entities.
7471 -- unless it is already a list member which means that it was
7472 -- already processed
7474 elsif not Is_List_Member (Act_Decl) then
7475 Mark_Rewrite_Insertion (Act_Decl);
7476 Insert_Before (Inst_Node, Act_Decl);
7480 Expander_Mode_Restore;
7481 end Instantiate_Package_Body;
7483 ---------------------------------
7484 -- Instantiate_Subprogram_Body --
7485 ---------------------------------
7487 procedure Instantiate_Subprogram_Body
7488 (Body_Info : Pending_Body_Info)
7490 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7491 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7492 Loc : constant Source_Ptr := Sloc (Inst_Node);
7493 Gen_Id : constant Node_Id := Name (Inst_Node);
7494 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7495 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7496 Anon_Id : constant Entity_Id :=
7497 Defining_Unit_Name (Specification (Act_Decl));
7498 Pack_Id : constant Entity_Id :=
7499 Defining_Unit_Name (Parent (Act_Decl));
7502 Gen_Body_Id : Node_Id;
7504 Act_Body_Id : Entity_Id;
7505 Pack_Body : Node_Id;
7506 Prev_Formal : Entity_Id;
7508 Unit_Renaming : Node_Id;
7510 Parent_Installed : Boolean := False;
7511 Save_Style_Check : constant Boolean := Style_Check;
7514 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7516 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7518 if No (Gen_Body_Id) then
7519 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7520 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7523 Instantiation_Node := Inst_Node;
7525 if Present (Gen_Body_Id) then
7526 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7528 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
7530 -- Either body is not present, or context is non-expanding, as
7531 -- when compiling a subunit. Mark the instance as completed, and
7532 -- diagnose a missing body when needed.
7535 and then Operating_Mode = Generate_Code
7538 ("missing proper body for instantiation", Gen_Body);
7541 Set_Has_Completion (Anon_Id);
7545 Save_Env (Gen_Unit, Anon_Id);
7546 Style_Check := False;
7547 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7548 Create_Instantiation_Source
7556 (Original_Node (Gen_Body), Empty, Instantiating => True);
7557 Act_Body_Id := Defining_Entity (Act_Body);
7558 Set_Chars (Act_Body_Id, Chars (Anon_Id));
7559 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
7560 Set_Corresponding_Spec (Act_Body, Anon_Id);
7561 Set_Has_Completion (Anon_Id);
7562 Check_Generic_Actuals (Pack_Id, False);
7564 -- If it is a child unit, make the parent instance (which is an
7565 -- instance of the parent of the generic) visible. The parent
7566 -- instance is the prefix of the name of the generic unit.
7568 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7569 and then Nkind (Gen_Id) = N_Expanded_Name
7571 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7572 Parent_Installed := True;
7574 elsif Is_Child_Unit (Gen_Unit) then
7575 Install_Parent (Scope (Gen_Unit), In_Body => True);
7576 Parent_Installed := True;
7579 -- Inside its body, a reference to the generic unit is a reference
7580 -- to the instance. The corresponding renaming is the first
7581 -- declaration in the body.
7584 Make_Subprogram_Renaming_Declaration (Loc,
7587 Specification (Original_Node (Gen_Body)),
7589 Instantiating => True),
7590 Name => New_Occurrence_Of (Anon_Id, Loc));
7592 -- If there is a formal subprogram with the same name as the
7593 -- unit itself, do not add this renaming declaration. This is
7594 -- a temporary fix for one ACVC test. ???
7596 Prev_Formal := First_Entity (Pack_Id);
7597 while Present (Prev_Formal) loop
7598 if Chars (Prev_Formal) = Chars (Gen_Unit)
7599 and then Is_Overloadable (Prev_Formal)
7604 Next_Entity (Prev_Formal);
7607 if Present (Prev_Formal) then
7608 Decls := New_List (Act_Body);
7610 Decls := New_List (Unit_Renaming, Act_Body);
7613 -- The subprogram body is placed in the body of a dummy package
7614 -- body, whose spec contains the subprogram declaration as well
7615 -- as the renaming declarations for the generic parameters.
7617 Pack_Body := Make_Package_Body (Loc,
7618 Defining_Unit_Name => New_Copy (Pack_Id),
7619 Declarations => Decls);
7621 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7623 -- If the instantiation is a library unit, then build resulting
7624 -- compilation unit nodes for the instance. The declaration of
7625 -- the enclosing package is the grandparent of the subprogram
7626 -- declaration. First replace the instantiation node as the unit
7627 -- of the corresponding compilation.
7629 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7630 if Parent (Inst_Node) = Cunit (Main_Unit) then
7631 Set_Unit (Parent (Inst_Node), Inst_Node);
7632 Build_Instance_Compilation_Unit_Nodes
7633 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
7634 Analyze (Inst_Node);
7636 Set_Parent (Pack_Body, Parent (Inst_Node));
7637 Analyze (Pack_Body);
7641 Insert_Before (Inst_Node, Pack_Body);
7642 Mark_Rewrite_Insertion (Pack_Body);
7643 Analyze (Pack_Body);
7645 if Expander_Active then
7646 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
7650 if not Generic_Separately_Compiled (Gen_Unit) then
7651 Inherit_Context (Gen_Body, Inst_Node);
7654 Restore_Private_Views (Pack_Id, False);
7656 if Parent_Installed then
7657 Remove_Parent (In_Body => True);
7661 Style_Check := Save_Style_Check;
7663 -- Body not found. Error was emitted already. If there were no
7664 -- previous errors, this may be an instance whose scope is a premature
7665 -- instance. In that case we must insure that the (legal) program does
7666 -- raise program error if executed. We generate a subprogram body for
7667 -- this purpose. See DEC ac30vso.
7669 elsif Serious_Errors_Detected = 0
7670 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
7672 if Ekind (Anon_Id) = E_Procedure then
7674 Make_Subprogram_Body (Loc,
7676 Make_Procedure_Specification (Loc,
7677 Defining_Unit_Name => New_Copy (Anon_Id),
7678 Parameter_Specifications =>
7680 (Parameter_Specifications (Parent (Anon_Id)))),
7682 Declarations => Empty_List,
7683 Handled_Statement_Sequence =>
7684 Make_Handled_Sequence_Of_Statements (Loc,
7687 Make_Raise_Program_Error (Loc,
7689 PE_Access_Before_Elaboration))));
7693 Make_Raise_Program_Error (Loc,
7694 Reason => PE_Access_Before_Elaboration);
7696 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
7697 Set_Analyzed (Ret_Expr);
7700 Make_Subprogram_Body (Loc,
7702 Make_Function_Specification (Loc,
7703 Defining_Unit_Name => New_Copy (Anon_Id),
7704 Parameter_Specifications =>
7706 (Parameter_Specifications (Parent (Anon_Id))),
7708 New_Occurrence_Of (Etype (Anon_Id), Loc)),
7710 Declarations => Empty_List,
7711 Handled_Statement_Sequence =>
7712 Make_Handled_Sequence_Of_Statements (Loc,
7714 New_List (Make_Return_Statement (Loc, Ret_Expr))));
7717 Pack_Body := Make_Package_Body (Loc,
7718 Defining_Unit_Name => New_Copy (Pack_Id),
7719 Declarations => New_List (Act_Body));
7721 Insert_After (Inst_Node, Pack_Body);
7722 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7723 Analyze (Pack_Body);
7726 Expander_Mode_Restore;
7727 end Instantiate_Subprogram_Body;
7729 ----------------------
7730 -- Instantiate_Type --
7731 ----------------------
7733 function Instantiate_Type
7736 Analyzed_Formal : Node_Id;
7737 Actual_Decls : List_Id) return Node_Id
7739 Loc : constant Source_Ptr := Sloc (Actual);
7740 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
7741 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
7742 Ancestor : Entity_Id := Empty;
7743 Def : constant Node_Id := Formal_Type_Definition (Formal);
7745 Decl_Node : Node_Id;
7747 procedure Validate_Array_Type_Instance;
7748 procedure Validate_Access_Subprogram_Instance;
7749 procedure Validate_Access_Type_Instance;
7750 procedure Validate_Derived_Type_Instance;
7751 procedure Validate_Private_Type_Instance;
7752 -- These procedures perform validation tests for the named case
7754 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
7755 -- Check that base types are the same and that the subtypes match
7756 -- statically. Used in several of the above.
7758 --------------------
7759 -- Subtypes_Match --
7760 --------------------
7762 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7763 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7766 return (Base_Type (T) = Base_Type (Act_T)
7767 -- why is the and then commented out here???
7768 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7769 and then Subtypes_Statically_Match (T, Act_T))
7771 or else (Is_Class_Wide_Type (Gen_T)
7772 and then Is_Class_Wide_Type (Act_T)
7775 Get_Instance_Of (Root_Type (Gen_T)),
7776 Root_Type (Act_T)));
7779 -----------------------------------------
7780 -- Validate_Access_Subprogram_Instance --
7781 -----------------------------------------
7783 procedure Validate_Access_Subprogram_Instance is
7785 if not Is_Access_Type (Act_T)
7786 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7789 ("expect access type in instantiation of &", Actual, Gen_T);
7790 Abandon_Instantiation (Actual);
7793 Check_Mode_Conformant
7794 (Designated_Type (Act_T),
7795 Designated_Type (A_Gen_T),
7799 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7800 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7802 ("protected access type not allowed for formal &",
7806 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7808 ("expect protected access type for formal &",
7811 end Validate_Access_Subprogram_Instance;
7813 -----------------------------------
7814 -- Validate_Access_Type_Instance --
7815 -----------------------------------
7817 procedure Validate_Access_Type_Instance is
7818 Desig_Type : constant Entity_Id :=
7820 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7823 if not Is_Access_Type (Act_T) then
7825 ("expect access type in instantiation of &", Actual, Gen_T);
7826 Abandon_Instantiation (Actual);
7829 if Is_Access_Constant (A_Gen_T) then
7830 if not Is_Access_Constant (Act_T) then
7832 ("actual type must be access-to-constant type", Actual);
7833 Abandon_Instantiation (Actual);
7836 if Is_Access_Constant (Act_T) then
7838 ("actual type must be access-to-variable type", Actual);
7839 Abandon_Instantiation (Actual);
7841 elsif Ekind (A_Gen_T) = E_General_Access_Type
7842 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7844 Error_Msg_N ("actual must be general access type!", Actual);
7845 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7846 Abandon_Instantiation (Actual);
7850 -- The designated subtypes, that is to say the subtypes introduced
7851 -- by an access type declaration (and not by a subtype declaration)
7854 if not Subtypes_Match
7855 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7858 ("designated type of actual does not match that of formal &",
7860 Abandon_Instantiation (Actual);
7862 elsif Is_Access_Type (Designated_Type (Act_T))
7863 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7865 Is_Constrained (Designated_Type (Desig_Type))
7868 ("designated type of actual does not match that of formal &",
7870 Abandon_Instantiation (Actual);
7872 end Validate_Access_Type_Instance;
7874 ----------------------------------
7875 -- Validate_Array_Type_Instance --
7876 ----------------------------------
7878 procedure Validate_Array_Type_Instance is
7883 function Formal_Dimensions return Int;
7884 -- Count number of dimensions in array type formal
7886 -----------------------
7887 -- Formal_Dimensions --
7888 -----------------------
7890 function Formal_Dimensions return Int is
7895 if Nkind (Def) = N_Constrained_Array_Definition then
7896 Index := First (Discrete_Subtype_Definitions (Def));
7898 Index := First (Subtype_Marks (Def));
7901 while Present (Index) loop
7907 end Formal_Dimensions;
7909 -- Start of processing for Validate_Array_Type_Instance
7912 if not Is_Array_Type (Act_T) then
7914 ("expect array type in instantiation of &", Actual, Gen_T);
7915 Abandon_Instantiation (Actual);
7917 elsif Nkind (Def) = N_Constrained_Array_Definition then
7918 if not (Is_Constrained (Act_T)) then
7920 ("expect constrained array in instantiation of &",
7922 Abandon_Instantiation (Actual);
7926 if Is_Constrained (Act_T) then
7928 ("expect unconstrained array in instantiation of &",
7930 Abandon_Instantiation (Actual);
7934 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7936 ("dimensions of actual do not match formal &", Actual, Gen_T);
7937 Abandon_Instantiation (Actual);
7940 I1 := First_Index (A_Gen_T);
7941 I2 := First_Index (Act_T);
7942 for J in 1 .. Formal_Dimensions loop
7944 -- If the indices of the actual were given by a subtype_mark,
7945 -- the index was transformed into a range attribute. Retrieve
7946 -- the original type mark for checking.
7948 if Is_Entity_Name (Original_Node (I2)) then
7949 T2 := Entity (Original_Node (I2));
7954 if not Subtypes_Match
7955 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
7958 ("index types of actual do not match those of formal &",
7960 Abandon_Instantiation (Actual);
7967 if not Subtypes_Match (
7968 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
7969 Component_Type (Act_T))
7972 ("component subtype of actual does not match that of formal &",
7974 Abandon_Instantiation (Actual);
7977 if Has_Aliased_Components (A_Gen_T)
7978 and then not Has_Aliased_Components (Act_T)
7981 ("actual must have aliased components to match formal type &",
7985 end Validate_Array_Type_Instance;
7987 ------------------------------------
7988 -- Validate_Derived_Type_Instance --
7989 ------------------------------------
7991 procedure Validate_Derived_Type_Instance is
7992 Actual_Discr : Entity_Id;
7993 Ancestor_Discr : Entity_Id;
7996 -- If the parent type in the generic declaration is itself
7997 -- a previous formal type, then it is local to the generic
7998 -- and absent from the analyzed generic definition. In that
7999 -- case the ancestor is the instance of the formal (which must
8000 -- have been instantiated previously), unless the ancestor is
8001 -- itself a formal derived type. In this latter case (which is the
8002 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8003 -- formals is the ancestor of its parent. Otherwise, the analyzed
8004 -- generic carries the parent type. If the parent type is defined
8005 -- in a previous formal package, then the scope of that formal
8006 -- package is that of the generic type itself, and it has already
8007 -- been mapped into the corresponding type in the actual package.
8009 -- Common case: parent type defined outside of the generic
8011 if Is_Entity_Name (Subtype_Mark (Def))
8012 and then Present (Entity (Subtype_Mark (Def)))
8014 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
8016 -- Check whether parent is defined in a previous formal package
8019 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
8022 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
8024 -- The type may be a local derivation, or a type extension of
8025 -- a previous formal, or of a formal of a parent package.
8027 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
8029 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
8031 -- Check whether the parent is another derived formal type
8032 -- in the same generic unit.
8034 if Etype (A_Gen_T) /= A_Gen_T
8035 and then Is_Generic_Type (Etype (A_Gen_T))
8036 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
8037 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
8039 -- Locate ancestor of parent from the subtype declaration
8040 -- created for the actual.
8046 Decl := First (Actual_Decls);
8047 while Present (Decl) loop
8048 if Nkind (Decl) = N_Subtype_Declaration
8049 and then Chars (Defining_Identifier (Decl)) =
8050 Chars (Etype (A_Gen_T))
8052 Ancestor := Generic_Parent_Type (Decl);
8060 pragma Assert (Present (Ancestor));
8064 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
8068 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
8071 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
8073 ("expect type derived from & in instantiation",
8074 Actual, First_Subtype (Ancestor));
8075 Abandon_Instantiation (Actual);
8078 -- Perform atomic/volatile checks (RM C.6(12))
8080 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
8082 ("cannot have atomic actual type for non-atomic formal type",
8085 elsif Is_Volatile (Act_T)
8086 and then not Is_Volatile (Ancestor)
8087 and then Is_By_Reference_Type (Ancestor)
8090 ("cannot have volatile actual type for non-volatile formal type",
8094 -- It should not be necessary to check for unknown discriminants
8095 -- on Formal, but for some reason Has_Unknown_Discriminants is
8096 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8097 -- returns False. This needs fixing. ???
8099 if not Is_Indefinite_Subtype (A_Gen_T)
8100 and then not Unknown_Discriminants_Present (Formal)
8101 and then Is_Indefinite_Subtype (Act_T)
8104 ("actual subtype must be constrained", Actual);
8105 Abandon_Instantiation (Actual);
8108 if not Unknown_Discriminants_Present (Formal) then
8109 if Is_Constrained (Ancestor) then
8110 if not Is_Constrained (Act_T) then
8112 ("actual subtype must be constrained", Actual);
8113 Abandon_Instantiation (Actual);
8116 -- Ancestor is unconstrained
8118 elsif Is_Constrained (Act_T) then
8119 if Ekind (Ancestor) = E_Access_Type
8120 or else Is_Composite_Type (Ancestor)
8123 ("actual subtype must be unconstrained", Actual);
8124 Abandon_Instantiation (Actual);
8127 -- A class-wide type is only allowed if the formal has
8128 -- unknown discriminants.
8130 elsif Is_Class_Wide_Type (Act_T)
8131 and then not Has_Unknown_Discriminants (Ancestor)
8134 ("actual for & cannot be a class-wide type", Actual, Gen_T);
8135 Abandon_Instantiation (Actual);
8137 -- Otherwise, the formal and actual shall have the same
8138 -- number of discriminants and each discriminant of the
8139 -- actual must correspond to a discriminant of the formal.
8141 elsif Has_Discriminants (Act_T)
8142 and then not Has_Unknown_Discriminants (Act_T)
8143 and then Has_Discriminants (Ancestor)
8145 Actual_Discr := First_Discriminant (Act_T);
8146 Ancestor_Discr := First_Discriminant (Ancestor);
8147 while Present (Actual_Discr)
8148 and then Present (Ancestor_Discr)
8150 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
8151 not Present (Corresponding_Discriminant (Actual_Discr))
8154 ("discriminant & does not correspond " &
8155 "to ancestor discriminant", Actual, Actual_Discr);
8156 Abandon_Instantiation (Actual);
8159 Next_Discriminant (Actual_Discr);
8160 Next_Discriminant (Ancestor_Discr);
8163 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
8165 ("actual for & must have same number of discriminants",
8167 Abandon_Instantiation (Actual);
8170 -- This case should be caught by the earlier check for
8171 -- for constrainedness, but the check here is added for
8174 elsif Has_Discriminants (Act_T)
8175 and then not Has_Unknown_Discriminants (Act_T)
8178 ("actual for & must not have discriminants", Actual, Gen_T);
8179 Abandon_Instantiation (Actual);
8181 elsif Has_Discriminants (Ancestor) then
8183 ("actual for & must have known discriminants", Actual, Gen_T);
8184 Abandon_Instantiation (Actual);
8187 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
8189 ("constraint on actual is incompatible with formal", Actual);
8190 Abandon_Instantiation (Actual);
8193 end Validate_Derived_Type_Instance;
8195 ------------------------------------
8196 -- Validate_Private_Type_Instance --
8197 ------------------------------------
8199 procedure Validate_Private_Type_Instance is
8200 Formal_Discr : Entity_Id;
8201 Actual_Discr : Entity_Id;
8202 Formal_Subt : Entity_Id;
8205 if Is_Limited_Type (Act_T)
8206 and then not Is_Limited_Type (A_Gen_T)
8209 ("actual for non-limited & cannot be a limited type", Actual,
8211 Explain_Limited_Type (Act_T, Actual);
8212 Abandon_Instantiation (Actual);
8214 elsif Is_Indefinite_Subtype (Act_T)
8215 and then not Is_Indefinite_Subtype (A_Gen_T)
8216 and then Ada_Version >= Ada_95
8219 ("actual for & must be a definite subtype", Actual, Gen_T);
8221 elsif not Is_Tagged_Type (Act_T)
8222 and then Is_Tagged_Type (A_Gen_T)
8225 ("actual for & must be a tagged type", Actual, Gen_T);
8227 elsif Has_Discriminants (A_Gen_T) then
8228 if not Has_Discriminants (Act_T) then
8230 ("actual for & must have discriminants", Actual, Gen_T);
8231 Abandon_Instantiation (Actual);
8233 elsif Is_Constrained (Act_T) then
8235 ("actual for & must be unconstrained", Actual, Gen_T);
8236 Abandon_Instantiation (Actual);
8239 Formal_Discr := First_Discriminant (A_Gen_T);
8240 Actual_Discr := First_Discriminant (Act_T);
8241 while Formal_Discr /= Empty loop
8242 if Actual_Discr = Empty then
8244 ("discriminants on actual do not match formal",
8246 Abandon_Instantiation (Actual);
8249 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
8251 -- access discriminants match if designated types do.
8253 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
8254 and then (Ekind (Base_Type (Etype (Actual_Discr))))
8255 = E_Anonymous_Access_Type
8256 and then Get_Instance_Of (
8257 Designated_Type (Base_Type (Formal_Subt)))
8258 = Designated_Type (Base_Type (Etype (Actual_Discr)))
8262 elsif Base_Type (Formal_Subt) /=
8263 Base_Type (Etype (Actual_Discr))
8266 ("types of actual discriminants must match formal",
8268 Abandon_Instantiation (Actual);
8270 elsif not Subtypes_Statically_Match
8271 (Formal_Subt, Etype (Actual_Discr))
8272 and then Ada_Version >= Ada_95
8275 ("subtypes of actual discriminants must match formal",
8277 Abandon_Instantiation (Actual);
8280 Next_Discriminant (Formal_Discr);
8281 Next_Discriminant (Actual_Discr);
8284 if Actual_Discr /= Empty then
8286 ("discriminants on actual do not match formal",
8288 Abandon_Instantiation (Actual);
8295 end Validate_Private_Type_Instance;
8297 -- Start of processing for Instantiate_Type
8300 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
8301 Error_Msg_N ("duplicate instantiation of generic type", Actual);
8304 elsif not Is_Entity_Name (Actual)
8305 or else not Is_Type (Entity (Actual))
8308 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
8309 Abandon_Instantiation (Actual);
8312 Act_T := Entity (Actual);
8314 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8315 -- as a generic actual parameter if the corresponding formal type
8316 -- does not have a known_discriminant_part, or is a formal derived
8317 -- type that is an Unchecked_Union type.
8319 if Is_Unchecked_Union (Base_Type (Act_T)) then
8320 if not Has_Discriminants (A_Gen_T)
8322 (Is_Derived_Type (A_Gen_T)
8324 Is_Unchecked_Union (A_Gen_T))
8328 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
8329 " discriminated formal type", Act_T);
8334 -- Deal with fixed/floating restrictions
8336 if Is_Floating_Point_Type (Act_T) then
8337 Check_Restriction (No_Floating_Point, Actual);
8338 elsif Is_Fixed_Point_Type (Act_T) then
8339 Check_Restriction (No_Fixed_Point, Actual);
8342 -- Deal with error of using incomplete type as generic actual
8344 if Ekind (Act_T) = E_Incomplete_Type then
8345 if No (Underlying_Type (Act_T)) then
8346 Error_Msg_N ("premature use of incomplete type", Actual);
8347 Abandon_Instantiation (Actual);
8349 Act_T := Full_View (Act_T);
8350 Set_Entity (Actual, Act_T);
8352 if Has_Private_Component (Act_T) then
8354 ("premature use of type with private component", Actual);
8358 -- Deal with error of premature use of private type as generic actual
8360 elsif Is_Private_Type (Act_T)
8361 and then Is_Private_Type (Base_Type (Act_T))
8362 and then not Is_Generic_Type (Act_T)
8363 and then not Is_Derived_Type (Act_T)
8364 and then No (Full_View (Root_Type (Act_T)))
8366 Error_Msg_N ("premature use of private type", Actual);
8368 elsif Has_Private_Component (Act_T) then
8370 ("premature use of type with private component", Actual);
8373 Set_Instance_Of (A_Gen_T, Act_T);
8375 -- If the type is generic, the class-wide type may also be used
8377 if Is_Tagged_Type (A_Gen_T)
8378 and then Is_Tagged_Type (Act_T)
8379 and then not Is_Class_Wide_Type (A_Gen_T)
8381 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
8382 Class_Wide_Type (Act_T));
8385 if not Is_Abstract (A_Gen_T)
8386 and then Is_Abstract (Act_T)
8389 ("actual of non-abstract formal cannot be abstract", Actual);
8392 if Is_Scalar_Type (Gen_T) then
8393 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
8398 when N_Formal_Private_Type_Definition =>
8399 Validate_Private_Type_Instance;
8401 when N_Formal_Derived_Type_Definition =>
8402 Validate_Derived_Type_Instance;
8404 when N_Formal_Discrete_Type_Definition =>
8405 if not Is_Discrete_Type (Act_T) then
8407 ("expect discrete type in instantiation of&", Actual, Gen_T);
8408 Abandon_Instantiation (Actual);
8411 when N_Formal_Signed_Integer_Type_Definition =>
8412 if not Is_Signed_Integer_Type (Act_T) then
8414 ("expect signed integer type in instantiation of&",
8416 Abandon_Instantiation (Actual);
8419 when N_Formal_Modular_Type_Definition =>
8420 if not Is_Modular_Integer_Type (Act_T) then
8422 ("expect modular type in instantiation of &", Actual, Gen_T);
8423 Abandon_Instantiation (Actual);
8426 when N_Formal_Floating_Point_Definition =>
8427 if not Is_Floating_Point_Type (Act_T) then
8429 ("expect float type in instantiation of &", Actual, Gen_T);
8430 Abandon_Instantiation (Actual);
8433 when N_Formal_Ordinary_Fixed_Point_Definition =>
8434 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
8436 ("expect ordinary fixed point type in instantiation of &",
8438 Abandon_Instantiation (Actual);
8441 when N_Formal_Decimal_Fixed_Point_Definition =>
8442 if not Is_Decimal_Fixed_Point_Type (Act_T) then
8444 ("expect decimal type in instantiation of &",
8446 Abandon_Instantiation (Actual);
8449 when N_Array_Type_Definition =>
8450 Validate_Array_Type_Instance;
8452 when N_Access_To_Object_Definition =>
8453 Validate_Access_Type_Instance;
8455 when N_Access_Function_Definition |
8456 N_Access_Procedure_Definition =>
8457 Validate_Access_Subprogram_Instance;
8460 raise Program_Error;
8465 Make_Subtype_Declaration (Loc,
8466 Defining_Identifier => New_Copy (Gen_T),
8467 Subtype_Indication => New_Reference_To (Act_T, Loc));
8469 if Is_Private_Type (Act_T) then
8470 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8472 elsif Is_Access_Type (Act_T)
8473 and then Is_Private_Type (Designated_Type (Act_T))
8475 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8478 -- Flag actual derived types so their elaboration produces the
8479 -- appropriate renamings for the primitive operations of the ancestor.
8480 -- Flag actual for formal private types as well, to determine whether
8481 -- operations in the private part may override inherited operations.
8483 if Nkind (Def) = N_Formal_Derived_Type_Definition
8484 or else Nkind (Def) = N_Formal_Private_Type_Definition
8486 Set_Generic_Parent_Type (Decl_Node, Ancestor);
8490 end Instantiate_Type;
8492 ---------------------
8493 -- Is_In_Main_Unit --
8494 ---------------------
8496 function Is_In_Main_Unit (N : Node_Id) return Boolean is
8497 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
8498 Current_Unit : Node_Id;
8501 if Unum = Main_Unit then
8504 -- If the current unit is a subunit then it is either the main unit
8505 -- or is being compiled as part of the main unit.
8507 elsif Nkind (N) = N_Compilation_Unit then
8508 return Nkind (Unit (N)) = N_Subunit;
8511 Current_Unit := Parent (N);
8512 while Present (Current_Unit)
8513 and then Nkind (Current_Unit) /= N_Compilation_Unit
8515 Current_Unit := Parent (Current_Unit);
8518 -- The instantiation node is in the main unit, or else the current
8519 -- node (perhaps as the result of nested instantiations) is in the
8520 -- main unit, or in the declaration of the main unit, which in this
8521 -- last case must be a body.
8523 return Unum = Main_Unit
8524 or else Current_Unit = Cunit (Main_Unit)
8525 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
8526 or else (Present (Library_Unit (Current_Unit))
8527 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
8528 end Is_In_Main_Unit;
8530 ----------------------------
8531 -- Load_Parent_Of_Generic --
8532 ----------------------------
8534 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
8535 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
8536 Save_Style_Check : constant Boolean := Style_Check;
8537 True_Parent : Node_Id;
8538 Inst_Node : Node_Id;
8542 if not In_Same_Source_Unit (N, Spec)
8543 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
8544 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
8545 and then not Is_In_Main_Unit (Spec))
8547 -- Find body of parent of spec, and analyze it. A special case
8548 -- arises when the parent is an instantiation, that is to say when
8549 -- we are currently instantiating a nested generic. In that case,
8550 -- there is no separate file for the body of the enclosing instance.
8551 -- Instead, the enclosing body must be instantiated as if it were
8552 -- a pending instantiation, in order to produce the body for the
8553 -- nested generic we require now. Note that in that case the
8554 -- generic may be defined in a package body, the instance defined
8555 -- in the same package body, and the original enclosing body may not
8556 -- be in the main unit.
8558 True_Parent := Parent (Spec);
8561 while Present (True_Parent)
8562 and then Nkind (True_Parent) /= N_Compilation_Unit
8564 if Nkind (True_Parent) = N_Package_Declaration
8566 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
8568 -- Parent is a compilation unit that is an instantiation.
8569 -- Instantiation node has been replaced with package decl.
8571 Inst_Node := Original_Node (True_Parent);
8574 elsif Nkind (True_Parent) = N_Package_Declaration
8575 and then Present (Generic_Parent (Specification (True_Parent)))
8576 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
8578 -- Parent is an instantiation within another specification.
8579 -- Declaration for instance has been inserted before original
8580 -- instantiation node. A direct link would be preferable?
8582 Inst_Node := Next (True_Parent);
8584 while Present (Inst_Node)
8585 and then Nkind (Inst_Node) /= N_Package_Instantiation
8590 -- If the instance appears within a generic, and the generic
8591 -- unit is defined within a formal package of the enclosing
8592 -- generic, there is no generic body available, and none
8593 -- needed. A more precise test should be used ???
8595 if No (Inst_Node) then
8601 True_Parent := Parent (True_Parent);
8605 -- Case where we are currently instantiating a nested generic
8607 if Present (Inst_Node) then
8608 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
8610 -- Instantiation node and declaration of instantiated package
8611 -- were exchanged when only the declaration was needed.
8612 -- Restore instantiation node before proceeding with body.
8614 Set_Unit (Parent (True_Parent), Inst_Node);
8617 -- Now complete instantiation of enclosing body, if it appears
8618 -- in some other unit. If it appears in the current unit, the
8619 -- body will have been instantiated already.
8621 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
8623 -- We need to determine the expander mode to instantiate
8624 -- the enclosing body. Because the generic body we need
8625 -- may use global entities declared in the enclosing package
8626 -- (including aggregates) it is in general necessary to
8627 -- compile this body with expansion enabled. The exception
8628 -- is if we are within a generic package, in which case
8629 -- the usual generic rule applies.
8632 Exp_Status : Boolean := True;
8636 -- Loop through scopes looking for generic package
8638 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
8639 while Present (Scop)
8640 and then Scop /= Standard_Standard
8642 if Ekind (Scop) = E_Generic_Package then
8643 Exp_Status := False;
8647 Scop := Scope (Scop);
8650 Instantiate_Package_Body
8651 (Pending_Body_Info'(
8652 Inst_Node, True_Parent, Exp_Status,
8653 Get_Code_Unit (Sloc (Inst_Node))));
8657 -- Case where we are not instantiating a nested generic
8660 Opt.Style_Check := False;
8661 Expander_Mode_Save_And_Set (True);
8662 Load_Needed_Body (Comp_Unit, OK);
8663 Opt.Style_Check := Save_Style_Check;
8664 Expander_Mode_Restore;
8667 and then Unit_Requires_Body (Defining_Entity (Spec))
8670 Bname : constant Unit_Name_Type :=
8671 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8674 Error_Msg_Unit_1 := Bname;
8675 Error_Msg_N ("this instantiation requires$!", N);
8677 Get_File_Name (Bname, Subunit => False);
8678 Error_Msg_N ("\but file{ was not found!", N);
8679 raise Unrecoverable_Error;
8685 -- If loading the parent of the generic caused an instantiation
8686 -- circularity, we abandon compilation at this point, because
8687 -- otherwise in some cases we get into trouble with infinite
8688 -- recursions after this point.
8690 if Circularity_Detected then
8691 raise Unrecoverable_Error;
8693 end Load_Parent_Of_Generic;
8695 -----------------------
8696 -- Move_Freeze_Nodes --
8697 -----------------------
8699 procedure Move_Freeze_Nodes
8700 (Out_Of : Entity_Id;
8705 Next_Decl : Node_Id;
8706 Next_Node : Node_Id := After;
8709 function Is_Outer_Type (T : Entity_Id) return Boolean;
8710 -- Check whether entity is declared in a scope external to that
8711 -- of the generic unit.
8717 function Is_Outer_Type (T : Entity_Id) return Boolean is
8718 Scop : Entity_Id := Scope (T);
8721 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8725 while Scop /= Standard_Standard loop
8727 if Scop = Out_Of then
8730 Scop := Scope (Scop);
8738 -- Start of processing for Move_Freeze_Nodes
8745 -- First remove the freeze nodes that may appear before all other
8749 while Present (Decl)
8750 and then Nkind (Decl) = N_Freeze_Entity
8751 and then Is_Outer_Type (Entity (Decl))
8753 Decl := Remove_Head (L);
8754 Insert_After (Next_Node, Decl);
8755 Set_Analyzed (Decl, False);
8760 -- Next scan the list of declarations and remove each freeze node that
8761 -- appears ahead of the current node.
8763 while Present (Decl) loop
8764 while Present (Next (Decl))
8765 and then Nkind (Next (Decl)) = N_Freeze_Entity
8766 and then Is_Outer_Type (Entity (Next (Decl)))
8768 Next_Decl := Remove_Next (Decl);
8769 Insert_After (Next_Node, Next_Decl);
8770 Set_Analyzed (Next_Decl, False);
8771 Next_Node := Next_Decl;
8774 -- If the declaration is a nested package or concurrent type, then
8775 -- recurse. Nested generic packages will have been processed from the
8778 if Nkind (Decl) = N_Package_Declaration then
8779 Spec := Specification (Decl);
8781 elsif Nkind (Decl) = N_Task_Type_Declaration then
8782 Spec := Task_Definition (Decl);
8784 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8785 Spec := Protected_Definition (Decl);
8791 if Present (Spec) then
8792 Move_Freeze_Nodes (Out_Of, Next_Node,
8793 Visible_Declarations (Spec));
8794 Move_Freeze_Nodes (Out_Of, Next_Node,
8795 Private_Declarations (Spec));
8800 end Move_Freeze_Nodes;
8806 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8808 return Generic_Renamings.Table (E).Next_In_HTable;
8811 ------------------------
8812 -- Preanalyze_Actuals --
8813 ------------------------
8815 procedure Pre_Analyze_Actuals (N : Node_Id) is
8818 Errs : constant Int := Serious_Errors_Detected;
8821 Assoc := First (Generic_Associations (N));
8823 while Present (Assoc) loop
8824 Act := Explicit_Generic_Actual_Parameter (Assoc);
8826 -- Within a nested instantiation, a defaulted actual is an
8827 -- empty association, so nothing to analyze. If the actual for
8828 -- a subprogram is an attribute, analyze prefix only, because
8829 -- actual is not a complete attribute reference.
8831 -- If actual is an allocator, analyze expression only. The full
8832 -- analysis can generate code, and if the instance is a compilation
8833 -- unit we have to wait until the package instance is installed to
8834 -- have a proper place to insert this code.
8836 -- String literals may be operators, but at this point we do not
8837 -- know whether the actual is a formal subprogram or a string.
8842 elsif Nkind (Act) = N_Attribute_Reference then
8843 Analyze (Prefix (Act));
8845 elsif Nkind (Act) = N_Explicit_Dereference then
8846 Analyze (Prefix (Act));
8848 elsif Nkind (Act) = N_Allocator then
8850 Expr : constant Node_Id := Expression (Act);
8853 if Nkind (Expr) = N_Subtype_Indication then
8854 Analyze (Subtype_Mark (Expr));
8855 Analyze_List (Constraints (Constraint (Expr)));
8861 elsif Nkind (Act) /= N_Operator_Symbol then
8865 if Errs /= Serious_Errors_Detected then
8866 Abandon_Instantiation (Act);
8871 end Pre_Analyze_Actuals;
8877 procedure Remove_Parent (In_Body : Boolean := False) is
8878 S : Entity_Id := Current_Scope;
8884 -- After child instantiation is complete, remove from scope stack
8885 -- the extra copy of the current scope, and then remove parent
8891 while Current_Scope /= S loop
8893 End_Package_Scope (Current_Scope);
8895 if In_Open_Scopes (P) then
8896 E := First_Entity (P);
8898 while Present (E) loop
8899 Set_Is_Immediately_Visible (E, True);
8903 if Is_Generic_Instance (Current_Scope)
8904 and then P /= Current_Scope
8906 -- We are within an instance of some sibling. Retain
8907 -- visibility of parent, for proper subsequent cleanup.
8909 Set_In_Private_Part (P);
8912 -- This looks incomplete: what about compilation units that
8913 -- were made visible by Install_Parent but should not remain
8914 -- visible??? Standard is on the scope stack.
8916 elsif not In_Open_Scopes (Scope (P)) then
8917 Set_Is_Immediately_Visible (P, False);
8921 -- Reset visibility of entities in the enclosing scope.
8923 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8924 Hidden := First_Elmt (Hidden_Entities);
8926 while Present (Hidden) loop
8927 Set_Is_Immediately_Visible (Node (Hidden), True);
8932 -- Each body is analyzed separately, and there is no context
8933 -- that needs preserving from one body instance to the next,
8934 -- so remove all parent scopes that have been installed.
8936 while Present (S) loop
8937 End_Package_Scope (S);
8938 Set_Is_Immediately_Visible (S, False);
8940 exit when S = Standard_Standard;
8950 procedure Restore_Env is
8951 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
8954 Ada_Version := Saved.Ada_Version;
8956 if No (Current_Instantiated_Parent.Act_Id) then
8958 -- Restore environment after subprogram inlining
8960 Restore_Private_Views (Empty);
8963 Current_Instantiated_Parent := Saved.Instantiated_Parent;
8964 Exchanged_Views := Saved.Exchanged_Views;
8965 Hidden_Entities := Saved.Hidden_Entities;
8966 Current_Sem_Unit := Saved.Current_Sem_Unit;
8968 Instance_Envs.Decrement_Last;
8971 ---------------------------
8972 -- Restore_Private_Views --
8973 ---------------------------
8975 procedure Restore_Private_Views
8976 (Pack_Id : Entity_Id;
8977 Is_Package : Boolean := True)
8985 procedure Restore_Nested_Formal (Formal : Entity_Id);
8986 -- Hide the generic formals of formal packages declared with box
8987 -- which were reachable in the current instantiation.
8989 procedure Restore_Nested_Formal (Formal : Entity_Id) is
8992 if Present (Renamed_Object (Formal))
8993 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
8997 elsif Present (Associated_Formal_Package (Formal))
8998 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9000 Ent := First_Entity (Formal);
9002 while Present (Ent) loop
9003 exit when Ekind (Ent) = E_Package
9004 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9006 Set_Is_Hidden (Ent);
9007 Set_Is_Potentially_Use_Visible (Ent, False);
9009 if Ekind (Ent) = E_Package then
9011 Restore_Nested_Formal (Ent);
9017 end Restore_Nested_Formal;
9020 M := First_Elmt (Exchanged_Views);
9021 while Present (M) loop
9024 -- Subtypes of types whose views have been exchanged, and that
9025 -- are defined within the instance, were not on the list of
9026 -- Private_Dependents on entry to the instance, so they have to
9027 -- be exchanged explicitly now, in order to remain consistent with
9028 -- the view of the parent type.
9030 if Ekind (Typ) = E_Private_Type
9031 or else Ekind (Typ) = E_Limited_Private_Type
9032 or else Ekind (Typ) = E_Record_Type_With_Private
9034 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9036 while Present (Dep_Elmt) loop
9037 Dep_Typ := Node (Dep_Elmt);
9039 if Scope (Dep_Typ) = Pack_Id
9040 and then Present (Full_View (Dep_Typ))
9042 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9043 Exchange_Declarations (Dep_Typ);
9046 Next_Elmt (Dep_Elmt);
9050 Exchange_Declarations (Node (M));
9054 if No (Pack_Id) then
9058 -- Make the generic formal parameters private, and make the formal
9059 -- types into subtypes of the actuals again.
9061 E := First_Entity (Pack_Id);
9063 while Present (E) loop
9064 Set_Is_Hidden (E, True);
9067 and then Nkind (Parent (E)) = N_Subtype_Declaration
9069 Set_Is_Generic_Actual_Type (E, False);
9071 -- An unusual case of aliasing: the actual may also be directly
9072 -- visible in the generic, and be private there, while it is
9073 -- fully visible in the context of the instance. The internal
9074 -- subtype is private in the instance, but has full visibility
9075 -- like its parent in the enclosing scope. This enforces the
9076 -- invariant that the privacy status of all private dependents of
9077 -- a type coincide with that of the parent type. This can only
9078 -- happen when a generic child unit is instantiated within a
9081 if Is_Private_Type (E)
9082 and then not Is_Private_Type (Etype (E))
9084 Exchange_Declarations (E);
9087 elsif Ekind (E) = E_Package then
9089 -- The end of the renaming list is the renaming of the generic
9090 -- package itself. If the instance is a subprogram, all entities
9091 -- in the corresponding package are renamings. If this entity is
9092 -- a formal package, make its own formals private as well. The
9093 -- actual in this case is itself the renaming of an instantation.
9094 -- If the entity is not a package renaming, it is the entity
9095 -- created to validate formal package actuals: ignore.
9097 -- If the actual is itself a formal package for the enclosing
9098 -- generic, or the actual for such a formal package, it remains
9099 -- visible on exit from the instance, and therefore nothing
9100 -- needs to be done either, except to keep it accessible.
9103 and then Renamed_Object (E) = Pack_Id
9107 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9110 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9111 Set_Is_Hidden (E, False);
9115 Act_P : constant Entity_Id := Renamed_Object (E);
9119 Id := First_Entity (Act_P);
9121 and then Id /= First_Private_Entity (Act_P)
9123 exit when Ekind (Id) = E_Package
9124 and then Renamed_Object (Id) = Act_P;
9126 Set_Is_Hidden (Id, True);
9127 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9129 if Ekind (Id) = E_Package then
9130 Restore_Nested_Formal (Id);
9141 end Restore_Private_Views;
9148 (Gen_Unit : Entity_Id;
9149 Act_Unit : Entity_Id)
9153 Set_Instance_Env (Gen_Unit, Act_Unit);
9156 ----------------------------
9157 -- Save_Global_References --
9158 ----------------------------
9160 procedure Save_Global_References (N : Node_Id) is
9161 Gen_Scope : Entity_Id;
9165 function Is_Global (E : Entity_Id) return Boolean;
9166 -- Check whether entity is defined outside of generic unit.
9167 -- Examine the scope of an entity, and the scope of the scope,
9168 -- etc, until we find either Standard, in which case the entity
9169 -- is global, or the generic unit itself, which indicates that
9170 -- the entity is local. If the entity is the generic unit itself,
9171 -- as in the case of a recursive call, or the enclosing generic unit,
9172 -- if different from the current scope, then it is local as well,
9173 -- because it will be replaced at the point of instantiation. On
9174 -- the other hand, if it is a reference to a child unit of a common
9175 -- ancestor, which appears in an instantiation, it is global because
9176 -- it is used to denote a specific compilation unit at the time the
9177 -- instantiations will be analyzed.
9179 procedure Reset_Entity (N : Node_Id);
9180 -- Save semantic information on global entity, so that it is not
9181 -- resolved again at instantiation time.
9183 procedure Save_Entity_Descendants (N : Node_Id);
9184 -- Apply Save_Global_References to the two syntactic descendants of
9185 -- non-terminal nodes that carry an Associated_Node and are processed
9186 -- through Reset_Entity. Once the global entity (if any) has been
9187 -- captured together with its type, only two syntactic descendants
9188 -- need to be traversed to complete the processing of the tree rooted
9189 -- at N. This applies to Selected_Components, Expanded_Names, and to
9190 -- Operator nodes. N can also be a character literal, identifier, or
9191 -- operator symbol node, but the call has no effect in these cases.
9193 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9194 -- Default actuals in nested instances must be handled specially
9195 -- because there is no link to them from the original tree. When an
9196 -- actual subprogram is given by a default, we add an explicit generic
9197 -- association for it in the instantiation node. When we save the
9198 -- global references on the name of the instance, we recover the list
9199 -- of generic associations, and add an explicit one to the original
9200 -- generic tree, through which a global actual can be preserved.
9201 -- Similarly, if a child unit is instantiated within a sibling, in the
9202 -- context of the parent, we must preserve the identifier of the parent
9203 -- so that it can be properly resolved in a subsequent instantiation.
9205 procedure Save_Global_Descendant (D : Union_Id);
9206 -- Apply Save_Global_References recursively to the descendents of
9209 procedure Save_References (N : Node_Id);
9210 -- This is the recursive procedure that does the work, once the
9211 -- enclosing generic scope has been established.
9217 function Is_Global (E : Entity_Id) return Boolean is
9218 Se : Entity_Id := Scope (E);
9220 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9221 -- Determine whether the parent node of a reference to a child unit
9222 -- denotes an instantiation or a formal package, in which case the
9223 -- reference to the child unit is global, even if it appears within
9224 -- the current scope (e.g. when the instance appears within the body
9227 ----------------------
9228 -- Is_Instance_Node --
9229 ----------------------
9231 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9233 return (Nkind (Decl) in N_Generic_Instantiation
9235 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9236 end Is_Instance_Node;
9238 -- Start of processing for Is_Global
9241 if E = Gen_Scope then
9244 elsif E = Standard_Standard then
9247 elsif Is_Child_Unit (E)
9248 and then (Is_Instance_Node (Parent (N2))
9249 or else (Nkind (Parent (N2)) = N_Expanded_Name
9250 and then N2 = Selector_Name (Parent (N2))
9251 and then Is_Instance_Node (Parent (Parent (N2)))))
9256 while Se /= Gen_Scope loop
9257 if Se = Standard_Standard then
9272 procedure Reset_Entity (N : Node_Id) is
9274 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9275 -- The type of N2 is global to the generic unit. Save the
9276 -- type in the generic node.
9278 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9279 -- Find the ultimate ancestor of the current unit. If it is
9280 -- not a generic unit, then the name of the current unit
9281 -- in the prefix of an expanded name must be replaced with
9282 -- its generic homonym to ensure that it will be properly
9283 -- resolved in an instance.
9285 ---------------------
9286 -- Set_Global_Type --
9287 ---------------------
9289 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9290 Typ : constant Entity_Id := Etype (N2);
9296 and then Has_Private_View (Entity (N))
9298 -- If the entity of N is not the associated node, this is
9299 -- a nested generic and it has an associated node as well,
9300 -- whose type is already the full view (see below). Indicate
9301 -- that the original node has a private view.
9303 Set_Has_Private_View (N);
9306 -- If not a private type, nothing else to do
9308 if not Is_Private_Type (Typ) then
9309 if Is_Array_Type (Typ)
9310 and then Is_Private_Type (Component_Type (Typ))
9312 Set_Has_Private_View (N);
9315 -- If it is a derivation of a private type in a context where
9316 -- no full view is needed, nothing to do either.
9318 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9321 -- Otherwise mark the type for flipping and use the full_view
9325 Set_Has_Private_View (N);
9327 if Present (Full_View (Typ)) then
9328 Set_Etype (N2, Full_View (Typ));
9331 end Set_Global_Type;
9337 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9338 Par : Entity_Id := E;
9341 while Is_Child_Unit (Par) loop
9348 -- Start of processing for Reset_Entity
9351 N2 := Get_Associated_Node (N);
9355 if Is_Global (E) then
9356 Set_Global_Type (N, N2);
9358 elsif Nkind (N) = N_Op_Concat
9359 and then Is_Generic_Type (Etype (N2))
9361 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9362 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9363 and then Is_Intrinsic_Subprogram (E)
9368 -- Entity is local. Mark generic node as unresolved.
9369 -- Note that now it does not have an entity.
9371 Set_Associated_Node (N, Empty);
9372 Set_Etype (N, Empty);
9375 if (Nkind (Parent (N)) = N_Package_Instantiation
9376 or else Nkind (Parent (N)) = N_Function_Instantiation
9377 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9378 and then N = Name (Parent (N))
9380 Save_Global_Defaults (Parent (N), Parent (N2));
9383 elsif Nkind (Parent (N)) = N_Selected_Component
9384 and then Nkind (Parent (N2)) = N_Expanded_Name
9387 if Is_Global (Entity (Parent (N2))) then
9388 Change_Selected_Component_To_Expanded_Name (Parent (N));
9389 Set_Associated_Node (Parent (N), Parent (N2));
9390 Set_Global_Type (Parent (N), Parent (N2));
9391 Save_Entity_Descendants (N);
9393 -- If this is a reference to the current generic entity,
9394 -- replace by the name of the generic homonym of the current
9395 -- package. This is because in an instantiation Par.P.Q will
9396 -- not resolve to the name of the instance, whose enclosing
9397 -- scope is not necessarily Par. We use the generic homonym
9398 -- rather that the name of the generic itself, because it may
9399 -- be hidden by a local declaration.
9401 elsif In_Open_Scopes (Entity (Parent (N2)))
9403 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9405 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9406 Rewrite (Parent (N),
9407 Make_Identifier (Sloc (N),
9409 Chars (Generic_Homonym (Entity (Parent (N2))))));
9411 Rewrite (Parent (N),
9412 Make_Identifier (Sloc (N),
9413 Chars => Chars (Selector_Name (Parent (N2)))));
9417 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9418 or else Nkind (Parent (Parent (N)))
9419 = N_Function_Instantiation
9420 or else Nkind (Parent (Parent (N)))
9421 = N_Procedure_Instantiation)
9422 and then Parent (N) = Name (Parent (Parent (N)))
9424 Save_Global_Defaults
9425 (Parent (Parent (N)), Parent (Parent ((N2))));
9428 -- A selected component may denote a static constant that has
9429 -- been folded. Make the same replacement in original tree.
9431 elsif Nkind (Parent (N)) = N_Selected_Component
9432 and then (Nkind (Parent (N2)) = N_Integer_Literal
9433 or else Nkind (Parent (N2)) = N_Real_Literal)
9435 Rewrite (Parent (N),
9436 New_Copy (Parent (N2)));
9437 Set_Analyzed (Parent (N), False);
9439 -- A selected component may be transformed into a parameterless
9440 -- function call. If the called entity is global, rewrite the
9441 -- node appropriately, i.e. as an extended name for the global
9444 elsif Nkind (Parent (N)) = N_Selected_Component
9445 and then Nkind (Parent (N2)) = N_Function_Call
9446 and then Is_Global (Entity (Name (Parent (N2))))
9448 Change_Selected_Component_To_Expanded_Name (Parent (N));
9449 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9450 Set_Global_Type (Parent (N), Name (Parent (N2)));
9451 Save_Entity_Descendants (N);
9454 -- Entity is local. Reset in generic unit, so that node
9455 -- is resolved anew at the point of instantiation.
9457 Set_Associated_Node (N, Empty);
9458 Set_Etype (N, Empty);
9462 -----------------------------
9463 -- Save_Entity_Descendants --
9464 -----------------------------
9466 procedure Save_Entity_Descendants (N : Node_Id) is
9470 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9471 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9474 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9476 when N_Expanded_Name | N_Selected_Component =>
9477 Save_Global_Descendant (Union_Id (Prefix (N)));
9478 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9480 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9484 raise Program_Error;
9486 end Save_Entity_Descendants;
9488 --------------------------
9489 -- Save_Global_Defaults --
9490 --------------------------
9492 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9493 Loc : constant Source_Ptr := Sloc (N1);
9494 Assoc2 : constant List_Id := Generic_Associations (N2);
9495 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9505 Assoc1 := Generic_Associations (N1);
9507 if Present (Assoc1) then
9508 Act1 := First (Assoc1);
9511 Set_Generic_Associations (N1, New_List);
9512 Assoc1 := Generic_Associations (N1);
9515 if Present (Assoc2) then
9516 Act2 := First (Assoc2);
9521 while Present (Act1) and then Present (Act2) loop
9526 -- Find the associations added for default suprograms.
9528 if Present (Act2) then
9529 while Nkind (Act2) /= N_Generic_Association
9530 or else No (Entity (Selector_Name (Act2)))
9531 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9536 -- Add a similar association if the default is global. The
9537 -- renaming declaration for the actual has been analyzed, and
9538 -- its alias is the program it renames. Link the actual in the
9539 -- original generic tree with the node in the analyzed tree.
9541 while Present (Act2) loop
9542 Subp := Entity (Selector_Name (Act2));
9543 Def := Explicit_Generic_Actual_Parameter (Act2);
9545 -- Following test is defence against rubbish errors
9547 if No (Alias (Subp)) then
9551 -- Retrieve the resolved actual from the renaming declaration
9552 -- created for the instantiated formal.
9554 Actual := Entity (Name (Parent (Parent (Subp))));
9555 Set_Entity (Def, Actual);
9556 Set_Etype (Def, Etype (Actual));
9558 if Is_Global (Actual) then
9560 Make_Generic_Association (Loc,
9561 Selector_Name => New_Occurrence_Of (Subp, Loc),
9562 Explicit_Generic_Actual_Parameter =>
9563 New_Occurrence_Of (Actual, Loc));
9566 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9568 Append (Ndec, Assoc1);
9570 -- If there are other defaults, add a dummy association
9571 -- in case there are other defaulted formals with the same
9574 elsif Present (Next (Act2)) then
9576 Make_Generic_Association (Loc,
9577 Selector_Name => New_Occurrence_Of (Subp, Loc),
9578 Explicit_Generic_Actual_Parameter => Empty);
9580 Append (Ndec, Assoc1);
9587 if Nkind (Name (N1)) = N_Identifier
9588 and then Is_Child_Unit (Gen_Id)
9589 and then Is_Global (Gen_Id)
9590 and then Is_Generic_Unit (Scope (Gen_Id))
9591 and then In_Open_Scopes (Scope (Gen_Id))
9593 -- This is an instantiation of a child unit within a sibling,
9594 -- so that the generic parent is in scope. An eventual instance
9595 -- must occur within the scope of an instance of the parent.
9596 -- Make name in instance into an expanded name, to preserve the
9597 -- identifier of the parent, so it can be resolved subsequently.
9600 Make_Expanded_Name (Loc,
9601 Chars => Chars (Gen_Id),
9602 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9603 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9604 Set_Entity (Name (N2), Gen_Id);
9607 Make_Expanded_Name (Loc,
9608 Chars => Chars (Gen_Id),
9609 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9610 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9612 Set_Associated_Node (Name (N1), Name (N2));
9613 Set_Associated_Node (Prefix (Name (N1)), Empty);
9615 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9616 Set_Etype (Name (N1), Etype (Gen_Id));
9619 end Save_Global_Defaults;
9621 ----------------------------
9622 -- Save_Global_Descendant --
9623 ----------------------------
9625 procedure Save_Global_Descendant (D : Union_Id) is
9629 if D in Node_Range then
9630 if D = Union_Id (Empty) then
9633 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9634 Save_References (Node_Id (D));
9637 elsif D in List_Range then
9638 if D = Union_Id (No_List)
9639 or else Is_Empty_List (List_Id (D))
9644 N1 := First (List_Id (D));
9645 while Present (N1) loop
9646 Save_References (N1);
9651 -- Element list or other non-node field, nothing to do
9656 end Save_Global_Descendant;
9658 ---------------------
9659 -- Save_References --
9660 ---------------------
9662 -- This is the recursive procedure that does the work, once the
9663 -- enclosing generic scope has been established. We have to treat
9664 -- specially a number of node rewritings that are required by semantic
9665 -- processing and which change the kind of nodes in the generic copy:
9666 -- typically constant-folding, replacing an operator node by a string
9667 -- literal, or a selected component by an expanded name. In each of
9668 -- those cases, the transformation is propagated to the generic unit.
9670 procedure Save_References (N : Node_Id) is
9675 elsif Nkind (N) = N_Character_Literal
9676 or else Nkind (N) = N_Operator_Symbol
9678 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9681 elsif Nkind (N) = N_Operator_Symbol
9682 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9684 Change_Operator_Symbol_To_String_Literal (N);
9687 elsif Nkind (N) in N_Op then
9689 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9691 if Nkind (N) = N_Op_Concat then
9692 Set_Is_Component_Left_Opnd (N,
9693 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9695 Set_Is_Component_Right_Opnd (N,
9696 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9701 -- Node may be transformed into call to a user-defined operator
9703 N2 := Get_Associated_Node (N);
9705 if Nkind (N2) = N_Function_Call then
9706 E := Entity (Name (N2));
9709 and then Is_Global (E)
9711 Set_Etype (N, Etype (N2));
9713 Set_Associated_Node (N, Empty);
9714 Set_Etype (N, Empty);
9717 elsif Nkind (N2) = N_Integer_Literal
9718 or else Nkind (N2) = N_Real_Literal
9719 or else Nkind (N2) = N_String_Literal
9721 -- Operation was constant-folded, perform the same
9722 -- replacement in generic.
9724 Rewrite (N, New_Copy (N2));
9725 Set_Analyzed (N, False);
9727 elsif Nkind (N2) = N_Identifier
9728 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9730 -- Same if call was folded into a literal, but in this
9731 -- case retain the entity to avoid spurious ambiguities
9732 -- if id is overloaded at the point of instantiation or
9735 Rewrite (N, New_Copy (N2));
9736 Set_Analyzed (N, False);
9740 -- Complete the check on operands, if node has not been
9743 if Nkind (N) in N_Op then
9744 Save_Entity_Descendants (N);
9747 elsif Nkind (N) = N_Identifier then
9748 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9750 -- If this is a discriminant reference, always save it.
9751 -- It is used in the instance to find the corresponding
9752 -- discriminant positionally rather than by name.
9754 Set_Original_Discriminant
9755 (N, Original_Discriminant (Get_Associated_Node (N)));
9759 N2 := Get_Associated_Node (N);
9761 if Nkind (N2) = N_Function_Call then
9762 E := Entity (Name (N2));
9764 -- Name resolves to a call to parameterless function.
9765 -- If original entity is global, mark node as resolved.
9768 and then Is_Global (E)
9770 Set_Etype (N, Etype (N2));
9772 Set_Associated_Node (N, Empty);
9773 Set_Etype (N, Empty);
9777 Nkind (N2) = N_Integer_Literal or else
9778 Nkind (N2) = N_Real_Literal or else
9779 Nkind (N2) = N_String_Literal
9781 -- Name resolves to named number that is constant-folded,
9782 -- or to string literal from concatenation.
9783 -- Perform the same replacement in generic.
9785 Rewrite (N, New_Copy (N2));
9786 Set_Analyzed (N, False);
9788 elsif Nkind (N2) = N_Explicit_Dereference then
9790 -- An identifier is rewritten as a dereference if it is
9791 -- the prefix in a selected component, and it denotes an
9792 -- access to a composite type, or a parameterless function
9793 -- call that returns an access type.
9795 -- Check whether corresponding entity in prefix is global.
9797 if Is_Entity_Name (Prefix (N2))
9798 and then Present (Entity (Prefix (N2)))
9799 and then Is_Global (Entity (Prefix (N2)))
9802 Make_Explicit_Dereference (Sloc (N),
9803 Prefix => Make_Identifier (Sloc (N),
9804 Chars => Chars (N))));
9805 Set_Associated_Node (Prefix (N), Prefix (N2));
9807 elsif Nkind (Prefix (N2)) = N_Function_Call
9808 and then Is_Global (Entity (Name (Prefix (N2))))
9811 Make_Explicit_Dereference (Sloc (N),
9812 Prefix => Make_Function_Call (Sloc (N),
9814 Make_Identifier (Sloc (N),
9815 Chars => Chars (N)))));
9818 (Name (Prefix (N)), Name (Prefix (N2)));
9821 Set_Associated_Node (N, Empty);
9822 Set_Etype (N, Empty);
9825 -- The subtype mark of a nominally unconstrained object
9826 -- is rewritten as a subtype indication using the bounds
9827 -- of the expression. Recover the original subtype mark.
9829 elsif Nkind (N2) = N_Subtype_Indication
9830 and then Is_Entity_Name (Original_Node (N2))
9832 Set_Associated_Node (N, Original_Node (N2));
9840 elsif Nkind (N) in N_Entity then
9845 use Atree.Unchecked_Access;
9846 -- This code section is part of implementing an untyped tree
9847 -- traversal, so it needs direct access to node fields.
9850 if Nkind (N) = N_Aggregate
9852 Nkind (N) = N_Extension_Aggregate
9854 N2 := Get_Associated_Node (N);
9857 or else No (Etype (N2))
9858 or else not Is_Global (Etype (N2))
9860 Set_Associated_Node (N, Empty);
9863 Save_Global_Descendant (Field1 (N));
9864 Save_Global_Descendant (Field2 (N));
9865 Save_Global_Descendant (Field3 (N));
9866 Save_Global_Descendant (Field5 (N));
9868 -- All other cases than aggregates
9871 Save_Global_Descendant (Field1 (N));
9872 Save_Global_Descendant (Field2 (N));
9873 Save_Global_Descendant (Field3 (N));
9874 Save_Global_Descendant (Field4 (N));
9875 Save_Global_Descendant (Field5 (N));
9879 end Save_References;
9881 -- Start of processing for Save_Global_References
9884 Gen_Scope := Current_Scope;
9886 -- If the generic unit is a child unit, references to entities in
9887 -- the parent are treated as local, because they will be resolved
9888 -- anew in the context of the instance of the parent.
9890 while Is_Child_Unit (Gen_Scope)
9891 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9893 Gen_Scope := Scope (Gen_Scope);
9896 Save_References (N);
9897 end Save_Global_References;
9899 --------------------------------------
9900 -- Set_Copied_Sloc_For_Inlined_Body --
9901 --------------------------------------
9903 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9905 Create_Instantiation_Source (N, E, True, S_Adjustment);
9906 end Set_Copied_Sloc_For_Inlined_Body;
9908 ---------------------
9909 -- Set_Instance_Of --
9910 ---------------------
9912 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9914 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9915 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9916 Generic_Renamings.Increment_Last;
9917 end Set_Instance_Of;
9919 --------------------
9920 -- Set_Next_Assoc --
9921 --------------------
9923 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9925 Generic_Renamings.Table (E).Next_In_HTable := Next;
9932 procedure Start_Generic is
9934 -- ??? I am sure more things could be factored out in this
9935 -- routine. Should probably be done at a later stage.
9937 Generic_Flags.Increment_Last;
9938 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9939 Inside_A_Generic := True;
9941 Expander_Mode_Save_And_Set (False);
9944 ----------------------
9945 -- Set_Instance_Env --
9946 ----------------------
9948 procedure Set_Instance_Env
9949 (Gen_Unit : Entity_Id;
9950 Act_Unit : Entity_Id)
9954 -- Regardless of the current mode, predefined units are analyzed in
9955 -- the most current Ada mode, and earlier version Ada checks do not
9956 -- apply to predefined units.
9958 if Is_Internal_File_Name
9959 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
9960 Renamings_Included => True) then
9961 Ada_Version := Ada_Version_Type'Last;
9964 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
9965 end Set_Instance_Env;
9971 procedure Switch_View (T : Entity_Id) is
9972 BT : constant Entity_Id := Base_Type (T);
9973 Priv_Elmt : Elmt_Id := No_Elmt;
9974 Priv_Sub : Entity_Id;
9977 -- T may be private but its base type may have been exchanged through
9978 -- some other occurrence, in which case there is nothing to switch.
9980 if not Is_Private_Type (BT) then
9984 Priv_Elmt := First_Elmt (Private_Dependents (BT));
9986 if Present (Full_View (BT)) then
9987 Append_Elmt (Full_View (BT), Exchanged_Views);
9988 Exchange_Declarations (BT);
9991 while Present (Priv_Elmt) loop
9992 Priv_Sub := (Node (Priv_Elmt));
9994 -- We avoid flipping the subtype if the Etype of its full
9995 -- view is private because this would result in a malformed
9996 -- subtype. This occurs when the Etype of the subtype full
9997 -- view is the full view of the base type (and since the
9998 -- base types were just switched, the subtype is pointing
9999 -- to the wrong view). This is currently the case for
10000 -- tagged record types, access types (maybe more?) and
10001 -- needs to be resolved. ???
10003 if Present (Full_View (Priv_Sub))
10004 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10006 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10007 Exchange_Declarations (Priv_Sub);
10010 Next_Elmt (Priv_Elmt);
10014 -----------------------------
10015 -- Valid_Default_Attribute --
10016 -----------------------------
10018 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10019 Attr_Id : constant Attribute_Id :=
10020 Get_Attribute_Id (Attribute_Name (Def));
10021 T : constant Entity_Id := Entity (Prefix (Def));
10022 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10035 F := First_Formal (Nam);
10036 while Present (F) loop
10037 Num_F := Num_F + 1;
10042 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10043 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10044 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10045 Attribute_Unbiased_Rounding =>
10048 and then Is_Floating_Point_Type (T);
10050 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10051 Attribute_Value | Attribute_Wide_Image |
10052 Attribute_Wide_Value =>
10053 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10055 when Attribute_Max | Attribute_Min =>
10056 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10058 when Attribute_Input =>
10059 OK := (Is_Fun and then Num_F = 1);
10061 when Attribute_Output | Attribute_Read | Attribute_Write =>
10062 OK := (not Is_Fun and then Num_F = 2);
10069 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10072 end Valid_Default_Attribute;
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