1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005, 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_Disp; use Sem_Disp;
55 with Sem_Elab; use Sem_Elab;
56 with Sem_Elim; use Sem_Elim;
57 with Sem_Eval; use Sem_Eval;
58 with Sem_Res; use Sem_Res;
59 with Sem_Type; use Sem_Type;
60 with Sem_Util; use Sem_Util;
61 with Sem_Warn; use Sem_Warn;
62 with Stand; use Stand;
63 with Sinfo; use Sinfo;
64 with Sinfo.CN; use Sinfo.CN;
65 with Sinput; use Sinput;
66 with Sinput.L; use Sinput.L;
67 with Snames; use Snames;
68 with Stringt; use Stringt;
69 with Uname; use Uname;
71 with Tbuild; use Tbuild;
72 with Uintp; use Uintp;
73 with Urealp; use Urealp;
77 package body Sem_Ch12 is
79 ----------------------------------------------------------
80 -- Implementation of Generic Analysis and Instantiation --
81 -----------------------------------------------------------
83 -- GNAT implements generics by macro expansion. No attempt is made to
84 -- share generic instantiations (for now). Analysis of a generic definition
85 -- does not perform any expansion action, but the expander must be called
86 -- on the tree for each instantiation, because the expansion may of course
87 -- depend on the generic actuals. All of this is best achieved as follows:
89 -- a) Semantic analysis of a generic unit is performed on a copy of the
90 -- tree for the generic unit. All tree modifications that follow analysis
91 -- do not affect the original tree. Links are kept between the original
92 -- tree and the copy, in order to recognize non-local references within
93 -- the generic, and propagate them to each instance (recall that name
94 -- resolution is done on the generic declaration: generics are not really
95 -- macros!). This is summarized in the following diagram:
97 -- .-----------. .----------.
98 -- | semantic |<--------------| generic |
100 -- | |==============>| |
101 -- |___________| global |__________|
112 -- b) Each instantiation copies the original tree, and inserts into it a
113 -- series of declarations that describe the mapping between generic formals
114 -- and actuals. For example, a generic In OUT parameter is an object
115 -- renaming of the corresponing actual, etc. Generic IN parameters are
116 -- constant declarations.
118 -- c) In order to give the right visibility for these renamings, we use
119 -- a different scheme for package and subprogram instantiations. For
120 -- packages, the list of renamings is inserted into the package
121 -- specification, before the visible declarations of the package. The
122 -- renamings are analyzed before any of the text of the instance, and are
123 -- thus visible at the right place. Furthermore, outside of the instance,
124 -- the generic parameters are visible and denote their corresponding
127 -- For subprograms, we create a container package to hold the renamings
128 -- and the subprogram instance itself. Analysis of the package makes the
129 -- renaming declarations visible to the subprogram. After analyzing the
130 -- package, the defining entity for the subprogram is touched-up so that
131 -- it appears declared in the current scope, and not inside the container
134 -- If the instantiation is a compilation unit, the container package is
135 -- given the same name as the subprogram instance. This ensures that
136 -- the elaboration procedure called by the binder, using the compilation
137 -- unit name, calls in fact the elaboration procedure for the package.
139 -- Not surprisingly, private types complicate this approach. By saving in
140 -- the original generic object the non-local references, we guarantee that
141 -- the proper entities are referenced at the point of instantiation.
142 -- However, for private types, this by itself does not insure that the
143 -- proper VIEW of the entity is used (the full type may be visible at the
144 -- point of generic definition, but not at instantiation, or vice-versa).
145 -- In order to reference the proper view, we special-case any reference
146 -- to private types in the generic object, by saving both views, one in
147 -- the generic and one in the semantic copy. At time of instantiation, we
148 -- check whether the two views are consistent, and exchange declarations if
149 -- necessary, in order to restore the correct visibility. Similarly, if
150 -- the instance view is private when the generic view was not, we perform
151 -- the exchange. After completing the instantiation, we restore the
152 -- current visibility. The flag Has_Private_View marks identifiers in the
153 -- the generic unit that require checking.
155 -- Visibility within nested generic units requires special handling.
156 -- Consider the following scheme:
158 -- type Global is ... -- outside of generic unit.
162 -- type Semi_Global is ... -- global to inner.
165 -- procedure inner (X1 : Global; X2 : Semi_Global);
167 -- procedure in2 is new inner (...); -- 4
170 -- package New_Outer is new Outer (...); -- 2
171 -- procedure New_Inner is new New_Outer.Inner (...); -- 3
173 -- The semantic analysis of Outer captures all occurrences of Global.
174 -- The semantic analysis of Inner (at 1) captures both occurrences of
175 -- Global and Semi_Global.
177 -- At point 2 (instantiation of Outer), we also produce a generic copy
178 -- of Inner, even though Inner is, at that point, not being instantiated.
179 -- (This is just part of the semantic analysis of New_Outer).
181 -- Critically, references to Global within Inner must be preserved, while
182 -- references to Semi_Global should not preserved, because they must now
183 -- resolve to an entity within New_Outer. To distinguish between these, we
184 -- use a global variable, Current_Instantiated_Parent, which is set when
185 -- performing a generic copy during instantiation (at 2). This variable is
186 -- used when performing a generic copy that is not an instantiation, but
187 -- that is nested within one, as the occurrence of 1 within 2. The analysis
188 -- of a nested generic only preserves references that are global to the
189 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to
190 -- determine whether a reference is external to the given parent.
192 -- The instantiation at point 3 requires no special treatment. The method
193 -- works as well for further nestings of generic units, but of course the
194 -- variable Current_Instantiated_Parent must be stacked because nested
195 -- instantiations can occur, e.g. the occurrence of 4 within 2.
197 -- The instantiation of package and subprogram bodies is handled in a
198 -- similar manner, except that it is delayed until after semantic
199 -- analysis is complete. In this fashion complex cross-dependencies
200 -- between several package declarations and bodies containing generics
201 -- can be compiled which otherwise would diagnose spurious circularities.
203 -- For example, it is possible to compile two packages A and B that
204 -- have the following structure:
206 -- package A is package B is
207 -- generic ... generic ...
208 -- package G_A is package G_B is
211 -- package body A is package body B is
212 -- package N_B is new G_B (..) package N_A is new G_A (..)
214 -- The table Pending_Instantiations in package Inline is used to keep
215 -- track of body instantiations that are delayed in this manner. Inline
216 -- handles the actual calls to do the body instantiations. This activity
217 -- is part of Inline, since the processing occurs at the same point, and
218 -- for essentially the same reason, as the handling of inlined routines.
220 ----------------------------------------------
221 -- Detection of Instantiation Circularities --
222 ----------------------------------------------
224 -- If we have a chain of instantiations that is circular, this is a
225 -- static error which must be detected at compile time. The detection
226 -- of these circularities is carried out at the point that we insert
227 -- a generic instance spec or body. If there is a circularity, then
228 -- the analysis of the offending spec or body will eventually result
229 -- in trying to load the same unit again, and we detect this problem
230 -- as we analyze the package instantiation for the second time.
232 -- At least in some cases after we have detected the circularity, we
233 -- get into trouble if we try to keep going. The following flag is
234 -- set if a circularity is detected, and used to abandon compilation
235 -- after the messages have been posted.
237 Circularity_Detected : Boolean := False;
238 -- This should really be reset on encountering a new main unit, but in
239 -- practice we are not using multiple main units so it is not critical.
241 -----------------------
242 -- Local subprograms --
243 -----------------------
245 procedure Abandon_Instantiation (N : Node_Id);
246 pragma No_Return (Abandon_Instantiation);
247 -- Posts an error message "instantiation abandoned" at the indicated
248 -- node and then raises the exception Instantiation_Error to do it.
250 procedure Analyze_Formal_Array_Type
251 (T : in out Entity_Id;
253 -- A formal array type is treated like an array type declaration, and
254 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is
255 -- in-out, because in the case of an anonymous type the entity is
256 -- actually created in the procedure.
258 -- The following procedures treat other kinds of formal parameters.
260 procedure Analyze_Formal_Derived_Type
265 -- The following subprograms create abbreviated declarations for formal
266 -- scalar types. We introduce an anonymous base of the proper class for
267 -- each of them, and define the formals as constrained first subtypes of
268 -- their bases. The bounds are expressions that are non-static in the
271 procedure Analyze_Formal_Decimal_Fixed_Point_Type
272 (T : Entity_Id; Def : Node_Id);
273 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id);
274 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id);
275 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id);
276 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id);
277 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
278 (T : Entity_Id; Def : Node_Id);
280 procedure Analyze_Formal_Private_Type
284 -- This needs comments???
286 procedure Analyze_Generic_Formal_Part (N : Node_Id);
288 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id);
289 -- This needs comments ???
291 function Analyze_Associations
294 F_Copy : List_Id) return List_Id;
295 -- At instantiation time, build the list of associations between formals
296 -- and actuals. Each association becomes a renaming declaration for the
297 -- formal entity. F_Copy is the analyzed list of formals in the generic
298 -- copy. It is used to apply legality checks to the actuals. I_Node is the
299 -- instantiation node itself.
301 procedure Analyze_Subprogram_Instantiation
305 procedure Build_Instance_Compilation_Unit_Nodes
309 -- This procedure is used in the case where the generic instance of a
310 -- subprogram body or package body is a library unit. In this case, the
311 -- original library unit node for the generic instantiation must be
312 -- replaced by the resulting generic body, and a link made to a new
313 -- compilation unit node for the generic declaration. The argument N is
314 -- the original generic instantiation. Act_Body and Act_Decl are the body
315 -- and declaration of the instance (either package body and declaration
316 -- nodes or subprogram body and declaration nodes depending on the case).
317 -- On return, the node N has been rewritten with the actual body.
319 procedure Check_Formal_Packages (P_Id : Entity_Id);
320 -- Apply the following to all formal packages in generic associations.
322 procedure Check_Formal_Package_Instance
323 (Formal_Pack : Entity_Id;
324 Actual_Pack : Entity_Id);
325 -- Verify that the actuals of the actual instance match the actuals of
326 -- the template for a formal package that is not declared with a box.
328 procedure Check_Forward_Instantiation (Decl : Node_Id);
329 -- If the generic is a local entity and the corresponding body has not
330 -- been seen yet, flag enclosing packages to indicate that it will be
331 -- elaborated after the generic body. Subprograms declared in the same
332 -- package cannot be inlined by the front-end because front-end inlining
333 -- requires a strict linear order of elaboration.
335 procedure Check_Hidden_Child_Unit
337 Gen_Unit : Entity_Id;
338 Act_Decl_Id : Entity_Id);
339 -- If the generic unit is an implicit child instance within a parent
340 -- instance, we need to make an explicit test that it is not hidden by
341 -- a child instance of the same name and parent.
343 procedure Check_Private_View (N : Node_Id);
344 -- Check whether the type of a generic entity has a different view between
345 -- the point of generic analysis and the point of instantiation. If the
346 -- view has changed, then at the point of instantiation we restore the
347 -- correct view to perform semantic analysis of the instance, and reset
348 -- the current view after instantiation. The processing is driven by the
349 -- current private status of the type of the node, and Has_Private_View,
350 -- a flag that is set at the point of generic compilation. If view and
351 -- flag are inconsistent then the type is updated appropriately.
353 procedure Check_Generic_Actuals
354 (Instance : Entity_Id;
355 Is_Formal_Box : Boolean);
356 -- Similar to previous one. Check the actuals in the instantiation,
357 -- whose views can change between the point of instantiation and the point
358 -- of instantiation of the body. In addition, mark the generic renamings
359 -- as generic actuals, so that they are not compatible with other actuals.
360 -- Recurse on an actual that is a formal package whose declaration has
363 function Contains_Instance_Of
366 N : Node_Id) return Boolean;
367 -- Inner is instantiated within the generic Outer. Check whether Inner
368 -- directly or indirectly contains an instance of Outer or of one of its
369 -- parents, in the case of a subunit. Each generic unit holds a list of
370 -- the entities instantiated within (at any depth). This procedure
371 -- determines whether the set of such lists contains a cycle, i.e. an
372 -- illegal circular instantiation.
374 function Denotes_Formal_Package
376 On_Exit : Boolean := False) return Boolean;
377 -- Returns True if E is a formal package of an enclosing generic, or
378 -- the actual for such a formal in an enclosing instantiation. If such
379 -- a package is used as a formal in an nested generic, or as an actual
380 -- in a nested instantiation, the visibility of ITS formals should not
381 -- be modified. When called from within Restore_Private_Views, the flag
382 -- On_Exit is true, to indicate that the search for a possible enclosing
383 -- instance should ignore the current one.
385 function Find_Actual_Type
387 Gen_Scope : Entity_Id) return Entity_Id;
388 -- When validating the actual types of a child instance, check whether
389 -- the formal is a formal type of the parent unit, and retrieve the current
390 -- actual for it. Typ is the entity in the analyzed formal type declaration
391 -- (component or index type of an array type) and Gen_Scope is the scope of
392 -- the analyzed formal array type.
394 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id;
395 -- Given the entity of a unit that is an instantiation, retrieve the
396 -- original instance node. This is used when loading the instantiations
397 -- of the ancestors of a child generic that is being instantiated.
399 function In_Same_Declarative_Part
401 Inst : Node_Id) return Boolean;
402 -- True if the instantiation Inst and the given freeze_node F_Node appear
403 -- within the same declarative part, ignoring subunits, but with no inter-
404 -- vening suprograms or concurrent units. If true, the freeze node
405 -- of the instance can be placed after the freeze node of the parent,
406 -- which it itself an instance.
408 function In_Main_Context (E : Entity_Id) return Boolean;
409 -- Check whether an instantiation is in the context of the main unit.
410 -- Used to determine whether its body should be elaborated to allow
411 -- front-end inlining.
413 procedure Set_Instance_Env
414 (Gen_Unit : Entity_Id;
415 Act_Unit : Entity_Id);
416 -- Save current instance on saved environment, to be used to determine
417 -- the global status of entities in nested instances. Part of Save_Env.
418 -- called after verifying that the generic unit is legal for the instance.
420 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id);
421 -- Associate analyzed generic parameter with corresponding
422 -- instance. Used for semantic checks at instantiation time.
424 function Has_Been_Exchanged (E : Entity_Id) return Boolean;
425 -- Traverse the Exchanged_Views list to see if a type was private
426 -- and has already been flipped during this phase of instantiation.
428 procedure Hide_Current_Scope;
429 -- When compiling a generic child unit, the parent context must be
430 -- present, but the instance and all entities that may be generated
431 -- must be inserted in the current scope. We leave the current scope
432 -- on the stack, but make its entities invisible to avoid visibility
433 -- problems. This is reversed at the end of instantiations. This is
434 -- not done for the instantiation of the bodies, which only require the
435 -- instances of the generic parents to be in scope.
437 procedure Install_Body
442 -- If the instantiation happens textually before the body of the generic,
443 -- the instantiation of the body must be analyzed after the generic body,
444 -- and not at the point of instantiation. Such early instantiations can
445 -- happen if the generic and the instance appear in a package declaration
446 -- because the generic body can only appear in the corresponding package
447 -- body. Early instantiations can also appear if generic, instance and
448 -- body are all in the declarative part of a subprogram or entry. Entities
449 -- of packages that are early instantiations are delayed, and their freeze
450 -- node appears after the generic body.
452 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id);
453 -- Insert freeze node at the end of the declarative part that includes the
454 -- instance node N. If N is in the visible part of an enclosing package
455 -- declaration, the freeze node has to be inserted at the end of the
456 -- private declarations, if any.
458 procedure Freeze_Subprogram_Body
459 (Inst_Node : Node_Id;
461 Pack_Id : Entity_Id);
462 -- The generic body may appear textually after the instance, including
463 -- in the proper body of a stub, or within a different package instance.
464 -- Given that the instance can only be elaborated after the generic, we
465 -- place freeze_nodes for the instance and/or for packages that may enclose
466 -- the instance and the generic, so that the back-end can establish the
467 -- proper order of elaboration.
470 -- Establish environment for subsequent instantiation. Separated from
471 -- Save_Env because data-structures for visibility handling must be
472 -- initialized before call to Check_Generic_Child_Unit.
474 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False);
475 -- When compiling an instance of a child unit the parent (which is
476 -- itself an instance) is an enclosing scope that must be made
477 -- immediately visible. This procedure is also used to install the non-
478 -- generic parent of a generic child unit when compiling its body, so that
479 -- full views of types in the parent are made visible.
481 procedure Remove_Parent (In_Body : Boolean := False);
482 -- Reverse effect after instantiation of child is complete.
484 procedure Inline_Instance_Body
486 Gen_Unit : Entity_Id;
488 -- If front-end inlining is requested, instantiate the package body,
489 -- and preserve the visibility of its compilation unit, to insure
490 -- that successive instantiations succeed.
492 -- The functions Instantiate_XXX perform various legality checks and build
493 -- the declarations for instantiated generic parameters.
494 -- Need to describe what the parameters are ???
496 function Instantiate_Object
499 Analyzed_Formal : Node_Id) return List_Id;
501 function Instantiate_Type
504 Analyzed_Formal : Node_Id;
505 Actual_Decls : List_Id) return Node_Id;
507 function Instantiate_Formal_Subprogram
510 Analyzed_Formal : Node_Id) return Node_Id;
512 function Instantiate_Formal_Package
515 Analyzed_Formal : Node_Id) return List_Id;
516 -- If the formal package is declared with a box, special visibility rules
517 -- apply to its formals: they are in the visible part of the package. This
518 -- is true in the declarative region of the formal package, that is to say
519 -- in the enclosing generic or instantiation. For an instantiation, the
520 -- parameters of the formal package are made visible in an explicit step.
521 -- Furthermore, if the actual is a visible use_clause, these formals must
522 -- be made potentially use_visible as well. On exit from the enclosing
523 -- instantiation, the reverse must be done.
525 -- For a formal package declared without a box, there are conformance rules
526 -- that apply to the actuals in the generic declaration and the actuals of
527 -- the actual package in the enclosing instantiation. The simplest way to
528 -- apply these rules is to repeat the instantiation of the formal package
529 -- in the context of the enclosing instance, and compare the generic
530 -- associations of this instantiation with those of the actual package.
532 function Is_In_Main_Unit (N : Node_Id) return Boolean;
533 -- Test if given node is in the main unit
535 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id);
536 -- If the generic appears in a separate non-generic library unit,
537 -- load the corresponding body to retrieve the body of the generic.
538 -- N is the node for the generic instantiation, Spec is the generic
539 -- package declaration.
541 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id);
542 -- Add the context clause of the unit containing a generic unit to
543 -- an instantiation that is a compilation unit.
545 function Get_Associated_Node (N : Node_Id) return Node_Id;
546 -- In order to propagate semantic information back from the analyzed
547 -- copy to the original generic, we maintain links between selected nodes
548 -- in the generic and their corresponding copies. At the end of generic
549 -- analysis, the routine Save_Global_References traverses the generic
550 -- tree, examines the semantic information, and preserves the links to
551 -- those nodes that contain global information. At instantiation, the
552 -- information from the associated node is placed on the new copy, so
553 -- that name resolution is not repeated.
555 -- Three kinds of source nodes have associated nodes:
557 -- a) those that can reference (denote) entities, that is identifiers,
558 -- character literals, expanded_names, operator symbols, operators,
559 -- and attribute reference nodes. These nodes have an Entity field
560 -- and are the set of nodes that are in N_Has_Entity.
562 -- b) aggregates (N_Aggregate and N_Extension_Aggregate)
564 -- c) selected components (N_Selected_Component)
566 -- For the first class, the associated node preserves the entity if it is
567 -- global. If the generic contains nested instantiations, the associated
568 -- node itself has been recopied, and a chain of them must be followed.
570 -- For aggregates, the associated node allows retrieval of the type, which
571 -- may otherwise not appear in the generic. The view of this type may be
572 -- different between generic and instantiation, and the full view can be
573 -- installed before the instantiation is analyzed. For aggregates of
574 -- type extensions, the same view exchange may have to be performed for
575 -- some of the ancestor types, if their view is private at the point of
578 -- Nodes that are selected components in the parse tree may be rewritten
579 -- as expanded names after resolution, and must be treated as potential
580 -- entity holders. which is why they also have an Associated_Node.
582 -- Nodes that do not come from source, such as freeze nodes, do not appear
583 -- in the generic tree, and need not have an associated node.
585 -- The associated node is stored in the Associated_Node field. Note that
586 -- this field overlaps Entity, which is fine, because the whole point is
587 -- that we don't need or want the normal Entity field in this situation.
589 procedure Move_Freeze_Nodes
593 -- Freeze nodes can be generated in the analysis of a generic unit, but
594 -- will not be seen by the back-end. It is necessary to move those nodes
595 -- to the enclosing scope if they freeze an outer entity. We place them
596 -- at the end of the enclosing generic package, which is semantically
599 procedure Pre_Analyze_Actuals (N : Node_Id);
600 -- Analyze actuals to perform name resolution. Full resolution is done
601 -- later, when the expected types are known, but names have to be captured
602 -- before installing parents of generics, that are not visible for the
603 -- actuals themselves.
605 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id);
606 -- Verify that an attribute that appears as the default for a formal
607 -- subprogram is a function or procedure with the correct profile.
609 -------------------------------------------
610 -- Data Structures for Generic Renamings --
611 -------------------------------------------
613 -- The map Generic_Renamings associates generic entities with their
614 -- corresponding actuals. Currently used to validate type instances.
615 -- It will eventually be used for all generic parameters to eliminate
616 -- the need for overload resolution in the instance.
618 type Assoc_Ptr is new Int;
620 Assoc_Null : constant Assoc_Ptr := -1;
625 Next_In_HTable : Assoc_Ptr;
628 package Generic_Renamings is new Table.Table
629 (Table_Component_Type => Assoc,
630 Table_Index_Type => Assoc_Ptr,
631 Table_Low_Bound => 0,
633 Table_Increment => 100,
634 Table_Name => "Generic_Renamings");
636 -- Variable to hold enclosing instantiation. When the environment is
637 -- saved for a subprogram inlining, the corresponding Act_Id is empty.
639 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null);
641 -- Hash table for associations
643 HTable_Size : constant := 37;
644 type HTable_Range is range 0 .. HTable_Size - 1;
646 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr);
647 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr;
648 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id;
649 function Hash (F : Entity_Id) return HTable_Range;
651 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable (
652 Header_Num => HTable_Range,
654 Elmt_Ptr => Assoc_Ptr,
655 Null_Ptr => Assoc_Null,
656 Set_Next => Set_Next_Assoc,
659 Get_Key => Get_Gen_Id,
663 Exchanged_Views : Elist_Id;
664 -- This list holds the private views that have been exchanged during
665 -- instantiation to restore the visibility of the generic declaration.
666 -- (see comments above). After instantiation, the current visibility is
667 -- reestablished by means of a traversal of this list.
669 Hidden_Entities : Elist_Id;
670 -- This list holds the entities of the current scope that are removed
671 -- from immediate visibility when instantiating a child unit. Their
672 -- visibility is restored in Remove_Parent.
674 -- Because instantiations can be recursive, the following must be saved
675 -- on entry and restored on exit from an instantiation (spec or body).
676 -- This is done by the two procedures Save_Env and Restore_Env. For
677 -- package and subprogram instantiations (but not for the body instances)
678 -- the action of Save_Env is done in two steps: Init_Env is called before
679 -- Check_Generic_Child_Unit, because setting the parent instances requires
680 -- that the visibility data structures be properly initialized. Once the
681 -- generic is unit is validated, Set_Instance_Env completes Save_Env.
683 type Instance_Env is record
684 Ada_Version : Ada_Version_Type;
685 Instantiated_Parent : Assoc;
686 Exchanged_Views : Elist_Id;
687 Hidden_Entities : Elist_Id;
688 Current_Sem_Unit : Unit_Number_Type;
691 package Instance_Envs is new Table.Table (
692 Table_Component_Type => Instance_Env,
693 Table_Index_Type => Int,
694 Table_Low_Bound => 0,
696 Table_Increment => 100,
697 Table_Name => "Instance_Envs");
699 procedure Restore_Private_Views
700 (Pack_Id : Entity_Id;
701 Is_Package : Boolean := True);
702 -- Restore the private views of external types, and unmark the generic
703 -- renamings of actuals, so that they become comptible subtypes again.
704 -- For subprograms, Pack_Id is the package constructed to hold the
707 procedure Switch_View (T : Entity_Id);
708 -- Switch the partial and full views of a type and its private
709 -- dependents (i.e. its subtypes and derived types).
711 ------------------------------------
712 -- Structures for Error Reporting --
713 ------------------------------------
715 Instantiation_Node : Node_Id;
716 -- Used by subprograms that validate instantiation of formal parameters
717 -- where there might be no actual on which to place the error message.
718 -- Also used to locate the instantiation node for generic subunits.
720 Instantiation_Error : exception;
721 -- When there is a semantic error in the generic parameter matching,
722 -- there is no point in continuing the instantiation, because the
723 -- number of cascaded errors is unpredictable. This exception aborts
724 -- the instantiation process altogether.
726 S_Adjustment : Sloc_Adjustment;
727 -- Offset created for each node in an instantiation, in order to keep
728 -- track of the source position of the instantiation in each of its nodes.
729 -- A subsequent semantic error or warning on a construct of the instance
730 -- points to both places: the original generic node, and the point of
731 -- instantiation. See Sinput and Sinput.L for additional details.
733 ------------------------------------------------------------
734 -- Data structure for keeping track when inside a Generic --
735 ------------------------------------------------------------
737 -- The following table is used to save values of the Inside_A_Generic
738 -- flag (see spec of Sem) when they are saved by Start_Generic.
740 package Generic_Flags is new Table.Table (
741 Table_Component_Type => Boolean,
742 Table_Index_Type => Int,
743 Table_Low_Bound => 0,
745 Table_Increment => 200,
746 Table_Name => "Generic_Flags");
748 ---------------------------
749 -- Abandon_Instantiation --
750 ---------------------------
752 procedure Abandon_Instantiation (N : Node_Id) is
754 Error_Msg_N ("instantiation abandoned!", N);
755 raise Instantiation_Error;
756 end Abandon_Instantiation;
758 --------------------------
759 -- Analyze_Associations --
760 --------------------------
762 function Analyze_Associations
765 F_Copy : List_Id) return List_Id
767 Actual_Types : constant Elist_Id := New_Elmt_List;
768 Assoc : constant List_Id := New_List;
769 Defaults : constant Elist_Id := New_Elmt_List;
770 Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy));
774 Next_Formal : Node_Id;
775 Temp_Formal : Node_Id;
776 Analyzed_Formal : Node_Id;
779 First_Named : Node_Id := Empty;
780 Found_Assoc : Node_Id;
781 Is_Named_Assoc : Boolean;
782 Num_Matched : Int := 0;
783 Num_Actuals : Int := 0;
785 function Matching_Actual
787 A_F : Entity_Id) return Node_Id;
788 -- Find actual that corresponds to a given a formal parameter. If the
789 -- actuals are positional, return the next one, if any. If the actuals
790 -- are named, scan the parameter associations to find the right one.
791 -- A_F is the corresponding entity in the analyzed generic,which is
792 -- placed on the selector name for ASIS use.
794 procedure Set_Analyzed_Formal;
795 -- Find the node in the generic copy that corresponds to a given formal.
796 -- The semantic information on this node is used to perform legality
797 -- checks on the actuals. Because semantic analysis can introduce some
798 -- anonymous entities or modify the declaration node itself, the
799 -- correspondence between the two lists is not one-one. In addition to
800 -- anonymous types, the presence a formal equality will introduce an
801 -- implicit declaration for the corresponding inequality.
803 ---------------------
804 -- Matching_Actual --
805 ---------------------
807 function Matching_Actual
809 A_F : Entity_Id) return Node_Id
815 Is_Named_Assoc := False;
817 -- End of list of purely positional parameters
822 -- Case of positional parameter corresponding to current formal
824 elsif No (Selector_Name (Actual)) then
825 Found := Explicit_Generic_Actual_Parameter (Actual);
826 Found_Assoc := Actual;
827 Num_Matched := Num_Matched + 1;
830 -- Otherwise scan list of named actuals to find the one with the
831 -- desired name. All remaining actuals have explicit names.
834 Is_Named_Assoc := True;
838 while Present (Actual) loop
839 if Chars (Selector_Name (Actual)) = Chars (F) then
840 Found := Explicit_Generic_Actual_Parameter (Actual);
841 Set_Entity (Selector_Name (Actual), A_F);
842 Set_Etype (Selector_Name (Actual), Etype (A_F));
843 Generate_Reference (A_F, Selector_Name (Actual));
844 Found_Assoc := Actual;
845 Num_Matched := Num_Matched + 1;
853 -- Reset for subsequent searches. In most cases the named
854 -- associations are in order. If they are not, we reorder them
855 -- to avoid scanning twice the same actual. This is not just a
856 -- question of efficiency: there may be multiple defaults with
857 -- boxes that have the same name. In a nested instantiation we
858 -- insert actuals for those defaults, and cannot rely on their
859 -- names to disambiguate them.
861 if Actual = First_Named then
864 elsif Present (Actual) then
865 Insert_Before (First_Named, Remove_Next (Prev));
868 Actual := First_Named;
874 -------------------------
875 -- Set_Analyzed_Formal --
876 -------------------------
878 procedure Set_Analyzed_Formal is
881 while Present (Analyzed_Formal) loop
882 Kind := Nkind (Analyzed_Formal);
884 case Nkind (Formal) is
886 when N_Formal_Subprogram_Declaration =>
887 exit when Kind in N_Formal_Subprogram_Declaration
890 (Defining_Unit_Name (Specification (Formal))) =
892 (Defining_Unit_Name (Specification (Analyzed_Formal)));
894 when N_Formal_Package_Declaration =>
896 Kind = N_Formal_Package_Declaration
898 Kind = N_Generic_Package_Declaration;
900 when N_Use_Package_Clause | N_Use_Type_Clause => exit;
904 -- Skip freeze nodes, and nodes inserted to replace
905 -- unrecognized pragmas.
908 Kind not in N_Formal_Subprogram_Declaration
909 and then Kind /= N_Subprogram_Declaration
910 and then Kind /= N_Freeze_Entity
911 and then Kind /= N_Null_Statement
912 and then Kind /= N_Itype_Reference
913 and then Chars (Defining_Identifier (Formal)) =
914 Chars (Defining_Identifier (Analyzed_Formal));
917 Next (Analyzed_Formal);
920 end Set_Analyzed_Formal;
922 -- Start of processing for Analyze_Associations
925 -- If named associations are present, save the first named association
926 -- (it may of course be Empty) to facilitate subsequent name search.
928 Actuals := Generic_Associations (I_Node);
930 if Present (Actuals) then
931 First_Named := First (Actuals);
933 while Present (First_Named)
934 and then No (Selector_Name (First_Named))
936 Num_Actuals := Num_Actuals + 1;
941 Named := First_Named;
942 while Present (Named) loop
943 if No (Selector_Name (Named)) then
944 Error_Msg_N ("invalid positional actual after named one", Named);
945 Abandon_Instantiation (Named);
948 -- A named association may lack an actual parameter, if it was
949 -- introduced for a default subprogram that turns out to be local
950 -- to the outer instantiation.
952 if Present (Explicit_Generic_Actual_Parameter (Named)) then
953 Num_Actuals := Num_Actuals + 1;
959 if Present (Formals) then
960 Formal := First_Non_Pragma (Formals);
961 Analyzed_Formal := First_Non_Pragma (F_Copy);
963 if Present (Actuals) then
964 Actual := First (Actuals);
966 -- All formals should have default values
972 while Present (Formal) loop
974 Next_Formal := Next_Non_Pragma (Formal);
976 case Nkind (Formal) is
977 when N_Formal_Object_Declaration =>
980 Defining_Identifier (Formal),
981 Defining_Identifier (Analyzed_Formal));
984 (Instantiate_Object (Formal, Match, Analyzed_Formal),
987 when N_Formal_Type_Declaration =>
990 Defining_Identifier (Formal),
991 Defining_Identifier (Analyzed_Formal));
994 Error_Msg_Sloc := Sloc (Gen_Unit);
997 Instantiation_Node, Defining_Identifier (Formal));
998 Error_Msg_NE ("\in instantiation of & declared#",
999 Instantiation_Node, Gen_Unit);
1000 Abandon_Instantiation (Instantiation_Node);
1006 (Formal, Match, Analyzed_Formal, Assoc));
1008 -- an instantiation is a freeze point for the actuals,
1009 -- unless this is a rewritten formal package.
1011 if Nkind (I_Node) /= N_Formal_Package_Declaration then
1012 Append_Elmt (Entity (Match), Actual_Types);
1016 -- A remote access-to-class-wide type must not be an
1017 -- actual parameter for a generic formal of an access
1018 -- type (E.2.2 (17)).
1020 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration
1022 Nkind (Formal_Type_Definition (Analyzed_Formal)) =
1023 N_Access_To_Object_Definition
1025 Validate_Remote_Access_To_Class_Wide_Type (Match);
1028 when N_Formal_Subprogram_Declaration =>
1031 Defining_Unit_Name (Specification (Formal)),
1032 Defining_Unit_Name (Specification (Analyzed_Formal)));
1034 -- If the formal subprogram has the same name as
1035 -- another formal subprogram of the generic, then
1036 -- a named association is illegal (12.3(9)). Exclude
1037 -- named associations that are generated for a nested
1041 and then Is_Named_Assoc
1042 and then Comes_From_Source (Found_Assoc)
1044 Temp_Formal := First (Formals);
1045 while Present (Temp_Formal) loop
1046 if Nkind (Temp_Formal) in
1047 N_Formal_Subprogram_Declaration
1048 and then Temp_Formal /= Formal
1050 Chars (Selector_Name (Found_Assoc)) =
1051 Chars (Defining_Unit_Name
1052 (Specification (Temp_Formal)))
1055 ("name not allowed for overloaded formal",
1057 Abandon_Instantiation (Instantiation_Node);
1065 Instantiate_Formal_Subprogram
1066 (Formal, Match, Analyzed_Formal));
1069 and then Box_Present (Formal)
1072 (Defining_Unit_Name (Specification (Last (Assoc))),
1076 when N_Formal_Package_Declaration =>
1079 Defining_Identifier (Formal),
1080 Defining_Identifier (Original_Node (Analyzed_Formal)));
1083 Error_Msg_Sloc := Sloc (Gen_Unit);
1086 Instantiation_Node, Defining_Identifier (Formal));
1087 Error_Msg_NE ("\in instantiation of & declared#",
1088 Instantiation_Node, Gen_Unit);
1090 Abandon_Instantiation (Instantiation_Node);
1095 (Instantiate_Formal_Package
1096 (Formal, Match, Analyzed_Formal),
1100 -- For use type and use package appearing in the context
1101 -- clause, we have already copied them, so we can just
1102 -- move them where they belong (we mustn't recopy them
1103 -- since this would mess up the Sloc values).
1105 when N_Use_Package_Clause |
1106 N_Use_Type_Clause =>
1108 Append (Formal, Assoc);
1111 raise Program_Error;
1115 Formal := Next_Formal;
1116 Next_Non_Pragma (Analyzed_Formal);
1119 if Num_Actuals > Num_Matched then
1120 Error_Msg_Sloc := Sloc (Gen_Unit);
1122 if Present (Selector_Name (Actual)) then
1124 ("unmatched actual&",
1125 Actual, Selector_Name (Actual));
1126 Error_Msg_NE ("\in instantiation of& declared#",
1130 ("unmatched actual in instantiation of& declared#",
1135 elsif Present (Actuals) then
1137 ("too many actuals in generic instantiation", Instantiation_Node);
1141 Elmt : Elmt_Id := First_Elmt (Actual_Types);
1144 while Present (Elmt) loop
1145 Freeze_Before (I_Node, Node (Elmt));
1150 -- If there are default subprograms, normalize the tree by adding
1151 -- explicit associations for them. This is required if the instance
1152 -- appears within a generic.
1160 Elmt := First_Elmt (Defaults);
1161 while Present (Elmt) loop
1162 if No (Actuals) then
1163 Actuals := New_List;
1164 Set_Generic_Associations (I_Node, Actuals);
1167 Subp := Node (Elmt);
1169 Make_Generic_Association (Sloc (Subp),
1170 Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)),
1171 Explicit_Generic_Actual_Parameter =>
1172 New_Occurrence_Of (Subp, Sloc (Subp)));
1173 Mark_Rewrite_Insertion (New_D);
1174 Append_To (Actuals, New_D);
1180 end Analyze_Associations;
1182 -------------------------------
1183 -- Analyze_Formal_Array_Type --
1184 -------------------------------
1186 procedure Analyze_Formal_Array_Type
1187 (T : in out Entity_Id;
1193 -- Treated like a non-generic array declaration, with
1194 -- additional semantic checks.
1198 if Nkind (Def) = N_Constrained_Array_Definition then
1199 DSS := First (Discrete_Subtype_Definitions (Def));
1200 while Present (DSS) loop
1201 if Nkind (DSS) = N_Subtype_Indication
1202 or else Nkind (DSS) = N_Range
1203 or else Nkind (DSS) = N_Attribute_Reference
1205 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS);
1212 Array_Type_Declaration (T, Def);
1213 Set_Is_Generic_Type (Base_Type (T));
1215 if Ekind (Component_Type (T)) = E_Incomplete_Type
1216 and then No (Full_View (Component_Type (T)))
1218 Error_Msg_N ("premature usage of incomplete type", Def);
1220 -- Check that range constraint is not allowed on the component type
1221 -- of a generic formal array type (AARM 12.5.3(3))
1223 elsif Is_Internal (Component_Type (T))
1224 and then Present (Subtype_Indication (Component_Definition (Def)))
1225 and then Nkind (Original_Node
1226 (Subtype_Indication (Component_Definition (Def))))
1227 = N_Subtype_Indication
1230 ("in a formal, a subtype indication can only be "
1231 & "a subtype mark ('R'M 12.5.3(3))",
1232 Subtype_Indication (Component_Definition (Def)));
1235 end Analyze_Formal_Array_Type;
1237 ---------------------------------------------
1238 -- Analyze_Formal_Decimal_Fixed_Point_Type --
1239 ---------------------------------------------
1241 -- As for other generic types, we create a valid type representation
1242 -- with legal but arbitrary attributes, whose values are never considered
1243 -- static. For all scalar types we introduce an anonymous base type, with
1244 -- the same attributes. We choose the corresponding integer type to be
1245 -- Standard_Integer.
1247 procedure Analyze_Formal_Decimal_Fixed_Point_Type
1251 Loc : constant Source_Ptr := Sloc (Def);
1252 Base : constant Entity_Id :=
1254 (E_Decimal_Fixed_Point_Type,
1255 Current_Scope, Sloc (Def), 'G');
1256 Int_Base : constant Entity_Id := Standard_Integer;
1257 Delta_Val : constant Ureal := Ureal_1;
1258 Digs_Val : constant Uint := Uint_6;
1263 Set_Etype (Base, Base);
1264 Set_Size_Info (Base, Int_Base);
1265 Set_RM_Size (Base, RM_Size (Int_Base));
1266 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base));
1267 Set_Digits_Value (Base, Digs_Val);
1268 Set_Delta_Value (Base, Delta_Val);
1269 Set_Small_Value (Base, Delta_Val);
1270 Set_Scalar_Range (Base,
1272 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1273 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1275 Set_Is_Generic_Type (Base);
1276 Set_Parent (Base, Parent (Def));
1278 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype);
1279 Set_Etype (T, Base);
1280 Set_Size_Info (T, Int_Base);
1281 Set_RM_Size (T, RM_Size (Int_Base));
1282 Set_First_Rep_Item (T, First_Rep_Item (Int_Base));
1283 Set_Digits_Value (T, Digs_Val);
1284 Set_Delta_Value (T, Delta_Val);
1285 Set_Small_Value (T, Delta_Val);
1286 Set_Scalar_Range (T, Scalar_Range (Base));
1287 Set_Is_Constrained (T);
1289 Check_Restriction (No_Fixed_Point, Def);
1290 end Analyze_Formal_Decimal_Fixed_Point_Type;
1292 ---------------------------------
1293 -- Analyze_Formal_Derived_Type --
1294 ---------------------------------
1296 procedure Analyze_Formal_Derived_Type
1301 Loc : constant Source_Ptr := Sloc (Def);
1302 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N);
1306 Set_Is_Generic_Type (T);
1308 if Private_Present (Def) then
1310 Make_Private_Extension_Declaration (Loc,
1311 Defining_Identifier => T,
1312 Discriminant_Specifications => Discriminant_Specifications (N),
1313 Unknown_Discriminants_Present => Unk_Disc,
1314 Subtype_Indication => Subtype_Mark (Def));
1316 Set_Abstract_Present (New_N, Abstract_Present (Def));
1320 Make_Full_Type_Declaration (Loc,
1321 Defining_Identifier => T,
1322 Discriminant_Specifications =>
1323 Discriminant_Specifications (Parent (T)),
1325 Make_Derived_Type_Definition (Loc,
1326 Subtype_Indication => Subtype_Mark (Def)));
1328 Set_Abstract_Present
1329 (Type_Definition (New_N), Abstract_Present (Def));
1336 if not Is_Composite_Type (T) then
1338 ("unknown discriminants not allowed for elementary types", N);
1340 Set_Has_Unknown_Discriminants (T);
1341 Set_Is_Constrained (T, False);
1345 -- If the parent type has a known size, so does the formal, which
1346 -- makes legal representation clauses that involve the formal.
1348 Set_Size_Known_At_Compile_Time
1349 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def))));
1351 end Analyze_Formal_Derived_Type;
1353 ----------------------------------
1354 -- Analyze_Formal_Discrete_Type --
1355 ----------------------------------
1357 -- The operations defined for a discrete types are those of an
1358 -- enumeration type. The size is set to an arbitrary value, for use
1359 -- in analyzing the generic unit.
1361 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is
1362 Loc : constant Source_Ptr := Sloc (Def);
1366 Base : constant Entity_Id :=
1368 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1371 Set_Ekind (T, E_Enumeration_Subtype);
1372 Set_Etype (T, Base);
1375 Set_Is_Generic_Type (T);
1376 Set_Is_Constrained (T);
1378 -- For semantic analysis, the bounds of the type must be set to some
1379 -- non-static value. The simplest is to create attribute nodes for
1380 -- those bounds, that refer to the type itself. These bounds are never
1381 -- analyzed but serve as place-holders.
1384 Make_Attribute_Reference (Loc,
1385 Attribute_Name => Name_First,
1386 Prefix => New_Reference_To (T, Loc));
1390 Make_Attribute_Reference (Loc,
1391 Attribute_Name => Name_Last,
1392 Prefix => New_Reference_To (T, Loc));
1395 Set_Scalar_Range (T,
1400 Set_Ekind (Base, E_Enumeration_Type);
1401 Set_Etype (Base, Base);
1402 Init_Size (Base, 8);
1403 Init_Alignment (Base);
1404 Set_Is_Generic_Type (Base);
1405 Set_Scalar_Range (Base, Scalar_Range (T));
1406 Set_Parent (Base, Parent (Def));
1408 end Analyze_Formal_Discrete_Type;
1410 ----------------------------------
1411 -- Analyze_Formal_Floating_Type --
1412 ---------------------------------
1414 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is
1415 Base : constant Entity_Id :=
1417 (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G');
1420 -- The various semantic attributes are taken from the predefined type
1421 -- Float, just so that all of them are initialized. Their values are
1422 -- never used because no constant folding or expansion takes place in
1423 -- the generic itself.
1426 Set_Ekind (T, E_Floating_Point_Subtype);
1427 Set_Etype (T, Base);
1428 Set_Size_Info (T, (Standard_Float));
1429 Set_RM_Size (T, RM_Size (Standard_Float));
1430 Set_Digits_Value (T, Digits_Value (Standard_Float));
1431 Set_Scalar_Range (T, Scalar_Range (Standard_Float));
1432 Set_Is_Constrained (T);
1434 Set_Is_Generic_Type (Base);
1435 Set_Etype (Base, Base);
1436 Set_Size_Info (Base, (Standard_Float));
1437 Set_RM_Size (Base, RM_Size (Standard_Float));
1438 Set_Digits_Value (Base, Digits_Value (Standard_Float));
1439 Set_Scalar_Range (Base, Scalar_Range (Standard_Float));
1440 Set_Parent (Base, Parent (Def));
1442 Check_Restriction (No_Floating_Point, Def);
1443 end Analyze_Formal_Floating_Type;
1445 ---------------------------------
1446 -- Analyze_Formal_Modular_Type --
1447 ---------------------------------
1449 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is
1451 -- Apart from their entity kind, generic modular types are treated
1452 -- like signed integer types, and have the same attributes.
1454 Analyze_Formal_Signed_Integer_Type (T, Def);
1455 Set_Ekind (T, E_Modular_Integer_Subtype);
1456 Set_Ekind (Etype (T), E_Modular_Integer_Type);
1458 end Analyze_Formal_Modular_Type;
1460 ---------------------------------------
1461 -- Analyze_Formal_Object_Declaration --
1462 ---------------------------------------
1464 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is
1465 E : constant Node_Id := Expression (N);
1466 Id : constant Node_Id := Defining_Identifier (N);
1473 -- Determine the mode of the formal object
1475 if Out_Present (N) then
1476 K := E_Generic_In_Out_Parameter;
1478 if not In_Present (N) then
1479 Error_Msg_N ("formal generic objects cannot have mode OUT", N);
1483 K := E_Generic_In_Parameter;
1486 Find_Type (Subtype_Mark (N));
1487 T := Entity (Subtype_Mark (N));
1489 if Ekind (T) = E_Incomplete_Type then
1490 Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N));
1493 if K = E_Generic_In_Parameter then
1495 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals
1497 if Ada_Version < Ada_05 and then Is_Limited_Type (T) then
1499 ("generic formal of mode IN must not be of limited type", N);
1500 Explain_Limited_Type (T, N);
1503 if Is_Abstract (T) then
1505 ("generic formal of mode IN must not be of abstract type", N);
1509 Analyze_Per_Use_Expression (E, T);
1515 -- Case of generic IN OUT parameter.
1518 -- If the formal has an unconstrained type, construct its
1519 -- actual subtype, as is done for subprogram formals. In this
1520 -- fashion, all its uses can refer to specific bounds.
1525 if (Is_Array_Type (T)
1526 and then not Is_Constrained (T))
1528 (Ekind (T) = E_Record_Type
1529 and then Has_Discriminants (T))
1532 Non_Freezing_Ref : constant Node_Id :=
1533 New_Reference_To (Id, Sloc (Id));
1537 -- Make sure that the actual subtype doesn't generate
1540 Set_Must_Not_Freeze (Non_Freezing_Ref);
1541 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref);
1542 Insert_Before_And_Analyze (N, Decl);
1543 Set_Actual_Subtype (Id, Defining_Identifier (Decl));
1546 Set_Actual_Subtype (Id, T);
1551 ("initialization not allowed for `IN OUT` formals", N);
1555 end Analyze_Formal_Object_Declaration;
1557 ----------------------------------------------
1558 -- Analyze_Formal_Ordinary_Fixed_Point_Type --
1559 ----------------------------------------------
1561 procedure Analyze_Formal_Ordinary_Fixed_Point_Type
1565 Loc : constant Source_Ptr := Sloc (Def);
1566 Base : constant Entity_Id :=
1568 (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G');
1570 -- The semantic attributes are set for completeness only, their
1571 -- values will never be used, because all properties of the type
1575 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype);
1576 Set_Etype (T, Base);
1577 Set_Size_Info (T, Standard_Integer);
1578 Set_RM_Size (T, RM_Size (Standard_Integer));
1579 Set_Small_Value (T, Ureal_1);
1580 Set_Delta_Value (T, Ureal_1);
1581 Set_Scalar_Range (T,
1583 Low_Bound => Make_Real_Literal (Loc, Ureal_1),
1584 High_Bound => Make_Real_Literal (Loc, Ureal_1)));
1585 Set_Is_Constrained (T);
1587 Set_Is_Generic_Type (Base);
1588 Set_Etype (Base, Base);
1589 Set_Size_Info (Base, Standard_Integer);
1590 Set_RM_Size (Base, RM_Size (Standard_Integer));
1591 Set_Small_Value (Base, Ureal_1);
1592 Set_Delta_Value (Base, Ureal_1);
1593 Set_Scalar_Range (Base, Scalar_Range (T));
1594 Set_Parent (Base, Parent (Def));
1596 Check_Restriction (No_Fixed_Point, Def);
1597 end Analyze_Formal_Ordinary_Fixed_Point_Type;
1599 ----------------------------
1600 -- Analyze_Formal_Package --
1601 ----------------------------
1603 procedure Analyze_Formal_Package (N : Node_Id) is
1604 Loc : constant Source_Ptr := Sloc (N);
1605 Pack_Id : constant Entity_Id := Defining_Identifier (N);
1607 Gen_Id : constant Node_Id := Name (N);
1609 Gen_Unit : Entity_Id;
1611 Parent_Installed : Boolean := False;
1613 Parent_Instance : Entity_Id;
1614 Renaming_In_Par : Entity_Id;
1617 Text_IO_Kludge (Gen_Id);
1620 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
1621 Gen_Unit := Entity (Gen_Id);
1623 if Ekind (Gen_Unit) /= E_Generic_Package then
1624 Error_Msg_N ("expect generic package name", Gen_Id);
1628 elsif Gen_Unit = Current_Scope then
1630 ("generic package cannot be used as a formal package of itself",
1635 elsif In_Open_Scopes (Gen_Unit) then
1636 if Is_Compilation_Unit (Gen_Unit)
1637 and then Is_Child_Unit (Current_Scope)
1639 -- Special-case the error when the formal is a parent, and
1640 -- continue analysis to minimize cascaded errors.
1643 ("generic parent cannot be used as formal package "
1644 & "of a child unit",
1649 ("generic package cannot be used as a formal package "
1657 -- Check for a formal package that is a package renaming.
1659 if Present (Renamed_Object (Gen_Unit)) then
1660 Gen_Unit := Renamed_Object (Gen_Unit);
1663 -- The formal package is treated like a regular instance, but only
1664 -- the specification needs to be instantiated, to make entities visible.
1666 if not Box_Present (N) then
1667 Hidden_Entities := New_Elmt_List;
1668 Analyze_Package_Instantiation (N);
1670 if Parent_Installed then
1675 -- If there are no generic associations, the generic parameters
1676 -- appear as local entities and are instantiated like them. We copy
1677 -- the generic package declaration as if it were an instantiation,
1678 -- and analyze it like a regular package, except that we treat the
1679 -- formals as additional visible components.
1681 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
1683 if In_Extended_Main_Source_Unit (N) then
1684 Set_Is_Instantiated (Gen_Unit);
1685 Generate_Reference (Gen_Unit, N);
1688 Formal := New_Copy (Pack_Id);
1691 (Original_Node (Gen_Decl), Empty, Instantiating => True);
1693 Set_Defining_Unit_Name (Specification (New_N), Formal);
1694 Set_Instance_Env (Gen_Unit, Formal);
1696 Enter_Name (Formal);
1697 Set_Ekind (Formal, E_Generic_Package);
1698 Set_Etype (Formal, Standard_Void_Type);
1699 Set_Inner_Instances (Formal, New_Elmt_List);
1702 -- Within the formal, the name of the generic package is a renaming
1703 -- of the formal (as for a regular instantiation).
1705 Renaming := Make_Package_Renaming_Declaration (Loc,
1706 Defining_Unit_Name =>
1707 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
1708 Name => New_Reference_To (Formal, Loc));
1710 if Present (Visible_Declarations (Specification (N))) then
1711 Prepend (Renaming, To => Visible_Declarations (Specification (N)));
1712 elsif Present (Private_Declarations (Specification (N))) then
1713 Prepend (Renaming, To => Private_Declarations (Specification (N)));
1716 if Is_Child_Unit (Gen_Unit)
1717 and then Parent_Installed
1719 -- Similarly, we have to make the name of the formal visible in
1720 -- the parent instance, to resolve properly fully qualified names
1721 -- that may appear in the generic unit. The parent instance has
1722 -- been placed on the scope stack ahead of the current scope.
1724 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity;
1727 Make_Defining_Identifier (Loc, Chars (Gen_Unit));
1728 Set_Ekind (Renaming_In_Par, E_Package);
1729 Set_Etype (Renaming_In_Par, Standard_Void_Type);
1730 Set_Scope (Renaming_In_Par, Parent_Instance);
1731 Set_Parent (Renaming_In_Par, Parent (Formal));
1732 Set_Renamed_Object (Renaming_In_Par, Formal);
1733 Append_Entity (Renaming_In_Par, Parent_Instance);
1736 Analyze_Generic_Formal_Part (N);
1737 Analyze (Specification (N));
1738 End_Package_Scope (Formal);
1740 if Parent_Installed then
1746 -- Inside the generic unit, the formal package is a regular
1747 -- package, but no body is needed for it. Note that after
1748 -- instantiation, the defining_unit_name we need is in the
1749 -- new tree and not in the original. (see Package_Instantiation).
1750 -- A generic formal package is an instance, and can be used as
1751 -- an actual for an inner instance. Mark its generic parent.
1753 Set_Ekind (Formal, E_Package);
1754 Set_Generic_Parent (Specification (N), Gen_Unit);
1755 Set_Has_Completion (Formal, True);
1757 Set_Ekind (Pack_Id, E_Package);
1758 Set_Etype (Pack_Id, Standard_Void_Type);
1759 Set_Scope (Pack_Id, Scope (Formal));
1760 Set_Has_Completion (Pack_Id, True);
1762 end Analyze_Formal_Package;
1764 ---------------------------------
1765 -- Analyze_Formal_Private_Type --
1766 ---------------------------------
1768 procedure Analyze_Formal_Private_Type
1774 New_Private_Type (N, T, Def);
1776 -- Set the size to an arbitrary but legal value.
1778 Set_Size_Info (T, Standard_Integer);
1779 Set_RM_Size (T, RM_Size (Standard_Integer));
1780 end Analyze_Formal_Private_Type;
1782 ----------------------------------------
1783 -- Analyze_Formal_Signed_Integer_Type --
1784 ----------------------------------------
1786 procedure Analyze_Formal_Signed_Integer_Type
1790 Base : constant Entity_Id :=
1792 (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G');
1797 Set_Ekind (T, E_Signed_Integer_Subtype);
1798 Set_Etype (T, Base);
1799 Set_Size_Info (T, Standard_Integer);
1800 Set_RM_Size (T, RM_Size (Standard_Integer));
1801 Set_Scalar_Range (T, Scalar_Range (Standard_Integer));
1802 Set_Is_Constrained (T);
1804 Set_Is_Generic_Type (Base);
1805 Set_Size_Info (Base, Standard_Integer);
1806 Set_RM_Size (Base, RM_Size (Standard_Integer));
1807 Set_Etype (Base, Base);
1808 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer));
1809 Set_Parent (Base, Parent (Def));
1810 end Analyze_Formal_Signed_Integer_Type;
1812 -------------------------------
1813 -- Analyze_Formal_Subprogram --
1814 -------------------------------
1816 procedure Analyze_Formal_Subprogram (N : Node_Id) is
1817 Spec : constant Node_Id := Specification (N);
1818 Def : constant Node_Id := Default_Name (N);
1819 Nam : constant Entity_Id := Defining_Unit_Name (Spec);
1827 if Nkind (Nam) = N_Defining_Program_Unit_Name then
1828 Error_Msg_N ("name of formal subprogram must be a direct name", Nam);
1832 Analyze_Subprogram_Declaration (N);
1833 Set_Is_Formal_Subprogram (Nam);
1834 Set_Has_Completion (Nam);
1836 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then
1837 Set_Is_Abstract (Nam);
1838 Set_Is_Dispatching_Operation (Nam);
1841 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam);
1844 if not Present (Ctrl_Type) then
1846 ("abstract formal subprogram must have a controlling type",
1850 Check_Controlling_Formals (Ctrl_Type, Nam);
1855 -- Default name is resolved at the point of instantiation
1857 if Box_Present (N) then
1860 -- Else default is bound at the point of generic declaration
1862 elsif Present (Def) then
1863 if Nkind (Def) = N_Operator_Symbol then
1864 Find_Direct_Name (Def);
1866 elsif Nkind (Def) /= N_Attribute_Reference then
1870 -- For an attribute reference, analyze the prefix and verify
1871 -- that it has the proper profile for the subprogram.
1873 Analyze (Prefix (Def));
1874 Valid_Default_Attribute (Nam, Def);
1878 -- Default name may be overloaded, in which case the interpretation
1879 -- with the correct profile must be selected, as for a renaming.
1881 if Etype (Def) = Any_Type then
1884 elsif Nkind (Def) = N_Selected_Component then
1885 Subp := Entity (Selector_Name (Def));
1887 if Ekind (Subp) /= E_Entry then
1888 Error_Msg_N ("expect valid subprogram name as default", Def);
1892 elsif Nkind (Def) = N_Indexed_Component then
1894 if Nkind (Prefix (Def)) /= N_Selected_Component then
1895 Error_Msg_N ("expect valid subprogram name as default", Def);
1899 Subp := Entity (Selector_Name (Prefix (Def)));
1901 if Ekind (Subp) /= E_Entry_Family then
1902 Error_Msg_N ("expect valid subprogram name as default", Def);
1907 elsif Nkind (Def) = N_Character_Literal then
1909 -- Needs some type checks: subprogram should be parameterless???
1911 Resolve (Def, (Etype (Nam)));
1913 elsif not Is_Entity_Name (Def)
1914 or else not Is_Overloadable (Entity (Def))
1916 Error_Msg_N ("expect valid subprogram name as default", Def);
1919 elsif not Is_Overloaded (Def) then
1920 Subp := Entity (Def);
1923 Error_Msg_N ("premature usage of formal subprogram", Def);
1925 elsif not Entity_Matches_Spec (Subp, Nam) then
1926 Error_Msg_N ("no visible entity matches specification", Def);
1932 I1 : Interp_Index := 0;
1938 Get_First_Interp (Def, I, It);
1939 while Present (It.Nam) loop
1941 if Entity_Matches_Spec (It.Nam, Nam) then
1942 if Subp /= Any_Id then
1943 It1 := Disambiguate (Def, I1, I, Etype (Subp));
1945 if It1 = No_Interp then
1946 Error_Msg_N ("ambiguous default subprogram", Def);
1959 Get_Next_Interp (I, It);
1963 if Subp /= Any_Id then
1964 Set_Entity (Def, Subp);
1967 Error_Msg_N ("premature usage of formal subprogram", Def);
1969 elsif Ekind (Subp) /= E_Operator then
1970 Check_Mode_Conformant (Subp, Nam);
1974 Error_Msg_N ("no visible subprogram matches specification", N);
1978 end Analyze_Formal_Subprogram;
1980 -------------------------------------
1981 -- Analyze_Formal_Type_Declaration --
1982 -------------------------------------
1984 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is
1985 Def : constant Node_Id := Formal_Type_Definition (N);
1989 T := Defining_Identifier (N);
1991 if Present (Discriminant_Specifications (N))
1992 and then Nkind (Def) /= N_Formal_Private_Type_Definition
1995 ("discriminants not allowed for this formal type",
1996 Defining_Identifier (First (Discriminant_Specifications (N))));
1999 -- Enter the new name, and branch to specific routine.
2002 when N_Formal_Private_Type_Definition =>
2003 Analyze_Formal_Private_Type (N, T, Def);
2005 when N_Formal_Derived_Type_Definition =>
2006 Analyze_Formal_Derived_Type (N, T, Def);
2008 when N_Formal_Discrete_Type_Definition =>
2009 Analyze_Formal_Discrete_Type (T, Def);
2011 when N_Formal_Signed_Integer_Type_Definition =>
2012 Analyze_Formal_Signed_Integer_Type (T, Def);
2014 when N_Formal_Modular_Type_Definition =>
2015 Analyze_Formal_Modular_Type (T, Def);
2017 when N_Formal_Floating_Point_Definition =>
2018 Analyze_Formal_Floating_Type (T, Def);
2020 when N_Formal_Ordinary_Fixed_Point_Definition =>
2021 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def);
2023 when N_Formal_Decimal_Fixed_Point_Definition =>
2024 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def);
2026 when N_Array_Type_Definition =>
2027 Analyze_Formal_Array_Type (T, Def);
2029 when N_Access_To_Object_Definition |
2030 N_Access_Function_Definition |
2031 N_Access_Procedure_Definition =>
2032 Analyze_Generic_Access_Type (T, Def);
2038 raise Program_Error;
2042 Set_Is_Generic_Type (T);
2043 end Analyze_Formal_Type_Declaration;
2045 ------------------------------------
2046 -- Analyze_Function_Instantiation --
2047 ------------------------------------
2049 procedure Analyze_Function_Instantiation (N : Node_Id) is
2051 Analyze_Subprogram_Instantiation (N, E_Function);
2052 end Analyze_Function_Instantiation;
2054 ---------------------------------
2055 -- Analyze_Generic_Access_Type --
2056 ---------------------------------
2058 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is
2062 if Nkind (Def) = N_Access_To_Object_Definition then
2063 Access_Type_Declaration (T, Def);
2065 if Is_Incomplete_Or_Private_Type (Designated_Type (T))
2066 and then No (Full_View (Designated_Type (T)))
2067 and then not Is_Generic_Type (Designated_Type (T))
2069 Error_Msg_N ("premature usage of incomplete type", Def);
2071 elsif Is_Internal (Designated_Type (T)) then
2073 ("only a subtype mark is allowed in a formal", Def);
2077 Access_Subprogram_Declaration (T, Def);
2079 end Analyze_Generic_Access_Type;
2081 ---------------------------------
2082 -- Analyze_Generic_Formal_Part --
2083 ---------------------------------
2085 procedure Analyze_Generic_Formal_Part (N : Node_Id) is
2086 Gen_Parm_Decl : Node_Id;
2089 -- The generic formals are processed in the scope of the generic
2090 -- unit, where they are immediately visible. The scope is installed
2093 Gen_Parm_Decl := First (Generic_Formal_Declarations (N));
2095 while Present (Gen_Parm_Decl) loop
2096 Analyze (Gen_Parm_Decl);
2097 Next (Gen_Parm_Decl);
2100 Generate_Reference_To_Generic_Formals (Current_Scope);
2101 end Analyze_Generic_Formal_Part;
2103 ------------------------------------------
2104 -- Analyze_Generic_Package_Declaration --
2105 ------------------------------------------
2107 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is
2108 Loc : constant Source_Ptr := Sloc (N);
2111 Save_Parent : Node_Id;
2113 Decls : constant List_Id :=
2114 Visible_Declarations (Specification (N));
2118 -- We introduce a renaming of the enclosing package, to have a usable
2119 -- entity as the prefix of an expanded name for a local entity of the
2120 -- form Par.P.Q, where P is the generic package. This is because a local
2121 -- entity named P may hide it, so that the usual visibility rules in
2122 -- the instance will not resolve properly.
2125 Make_Package_Renaming_Declaration (Loc,
2126 Defining_Unit_Name =>
2127 Make_Defining_Identifier (Loc,
2128 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")),
2129 Name => Make_Identifier (Loc, Chars (Defining_Entity (N))));
2131 if Present (Decls) then
2132 Decl := First (Decls);
2133 while Present (Decl)
2134 and then Nkind (Decl) = N_Pragma
2139 if Present (Decl) then
2140 Insert_Before (Decl, Renaming);
2142 Append (Renaming, Visible_Declarations (Specification (N)));
2146 Set_Visible_Declarations (Specification (N), New_List (Renaming));
2149 -- Create copy of generic unit, and save for instantiation.
2150 -- If the unit is a child unit, do not copy the specifications
2151 -- for the parent, which are not part of the generic tree.
2153 Save_Parent := Parent_Spec (N);
2154 Set_Parent_Spec (N, Empty);
2156 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2157 Set_Parent_Spec (New_N, Save_Parent);
2159 Id := Defining_Entity (N);
2160 Generate_Definition (Id);
2162 -- Expansion is not applied to generic units.
2167 Set_Ekind (Id, E_Generic_Package);
2168 Set_Etype (Id, Standard_Void_Type);
2170 Enter_Generic_Scope (Id);
2171 Set_Inner_Instances (Id, New_Elmt_List);
2173 Set_Categorization_From_Pragmas (N);
2174 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2176 -- Link the declaration of the generic homonym in the generic copy
2177 -- to the package it renames, so that it is always resolved properly.
2179 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming));
2180 Set_Entity (Associated_Node (Name (Renaming)), Id);
2182 -- For a library unit, we have reconstructed the entity for the
2183 -- unit, and must reset it in the library tables.
2185 if Nkind (Parent (N)) = N_Compilation_Unit then
2186 Set_Cunit_Entity (Current_Sem_Unit, Id);
2189 Analyze_Generic_Formal_Part (N);
2191 -- After processing the generic formals, analysis proceeds
2192 -- as for a non-generic package.
2194 Analyze (Specification (N));
2196 Validate_Categorization_Dependency (N, Id);
2200 End_Package_Scope (Id);
2201 Exit_Generic_Scope (Id);
2203 if Nkind (Parent (N)) /= N_Compilation_Unit then
2204 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N)));
2205 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N)));
2206 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N));
2209 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2210 Validate_RT_RAT_Component (N);
2212 -- If this is a spec without a body, check that generic parameters
2215 if not Body_Required (Parent (N)) then
2216 Check_References (Id);
2219 end Analyze_Generic_Package_Declaration;
2221 --------------------------------------------
2222 -- Analyze_Generic_Subprogram_Declaration --
2223 --------------------------------------------
2225 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is
2230 Save_Parent : Node_Id;
2233 -- Create copy of generic unit,and save for instantiation.
2234 -- If the unit is a child unit, do not copy the specifications
2235 -- for the parent, which are not part of the generic tree.
2237 Save_Parent := Parent_Spec (N);
2238 Set_Parent_Spec (N, Empty);
2240 New_N := Copy_Generic_Node (N, Empty, Instantiating => False);
2241 Set_Parent_Spec (New_N, Save_Parent);
2244 Spec := Specification (N);
2245 Id := Defining_Entity (Spec);
2246 Generate_Definition (Id);
2248 if Nkind (Id) = N_Defining_Operator_Symbol then
2250 ("operator symbol not allowed for generic subprogram", Id);
2257 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1);
2259 Enter_Generic_Scope (Id);
2260 Set_Inner_Instances (Id, New_Elmt_List);
2261 Set_Is_Pure (Id, Is_Pure (Current_Scope));
2263 Analyze_Generic_Formal_Part (N);
2265 Formals := Parameter_Specifications (Spec);
2267 if Present (Formals) then
2268 Process_Formals (Formals, Spec);
2271 if Nkind (Spec) = N_Function_Specification then
2272 Set_Ekind (Id, E_Generic_Function);
2273 Find_Type (Subtype_Mark (Spec));
2274 Set_Etype (Id, Entity (Subtype_Mark (Spec)));
2276 Set_Ekind (Id, E_Generic_Procedure);
2277 Set_Etype (Id, Standard_Void_Type);
2280 -- For a library unit, we have reconstructed the entity for the
2281 -- unit, and must reset it in the library tables. We also need
2282 -- to make sure that Body_Required is set properly in the original
2283 -- compilation unit node.
2285 if Nkind (Parent (N)) = N_Compilation_Unit then
2286 Set_Cunit_Entity (Current_Sem_Unit, Id);
2287 Set_Body_Required (Parent (N), Unit_Requires_Body (Id));
2290 Set_Categorization_From_Pragmas (N);
2291 Validate_Categorization_Dependency (N, Id);
2293 Save_Global_References (Original_Node (N));
2297 Exit_Generic_Scope (Id);
2298 Generate_Reference_To_Formals (Id);
2299 end Analyze_Generic_Subprogram_Declaration;
2301 -----------------------------------
2302 -- Analyze_Package_Instantiation --
2303 -----------------------------------
2305 -- Note: this procedure is also used for formal package declarations,
2306 -- in which case the argument N is an N_Formal_Package_Declaration
2307 -- node. This should really be noted in the spec! ???
2309 procedure Analyze_Package_Instantiation (N : Node_Id) is
2310 Loc : constant Source_Ptr := Sloc (N);
2311 Gen_Id : constant Node_Id := Name (N);
2314 Act_Decl_Name : Node_Id;
2315 Act_Decl_Id : Entity_Id;
2320 Gen_Unit : Entity_Id;
2322 Is_Actual_Pack : constant Boolean :=
2323 Is_Internal (Defining_Entity (N));
2325 Parent_Installed : Boolean := False;
2326 Renaming_List : List_Id;
2327 Unit_Renaming : Node_Id;
2328 Needs_Body : Boolean;
2329 Inline_Now : Boolean := False;
2331 procedure Delay_Descriptors (E : Entity_Id);
2332 -- Delay generation of subprogram descriptors for given entity
2334 function Might_Inline_Subp return Boolean;
2335 -- If inlining is active and the generic contains inlined subprograms,
2336 -- we instantiate the body. This may cause superfluous instantiations,
2337 -- but it is simpler than detecting the need for the body at the point
2338 -- of inlining, when the context of the instance is not available.
2340 -----------------------
2341 -- Delay_Descriptors --
2342 -----------------------
2344 procedure Delay_Descriptors (E : Entity_Id) is
2346 if not Delay_Subprogram_Descriptors (E) then
2347 Set_Delay_Subprogram_Descriptors (E);
2348 Pending_Descriptor.Increment_Last;
2349 Pending_Descriptor.Table (Pending_Descriptor.Last) := E;
2351 end Delay_Descriptors;
2353 -----------------------
2354 -- Might_Inline_Subp --
2355 -----------------------
2357 function Might_Inline_Subp return Boolean is
2361 if not Inline_Processing_Required then
2365 E := First_Entity (Gen_Unit);
2366 while Present (E) loop
2367 if Is_Subprogram (E)
2368 and then Is_Inlined (E)
2378 end Might_Inline_Subp;
2380 -- Start of processing for Analyze_Package_Instantiation
2383 -- Very first thing: apply the special kludge for Text_IO processing
2384 -- in case we are instantiating one of the children of [Wide_]Text_IO.
2386 Text_IO_Kludge (Name (N));
2388 -- Make node global for error reporting.
2390 Instantiation_Node := N;
2392 -- Case of instantiation of a generic package
2394 if Nkind (N) = N_Package_Instantiation then
2395 Act_Decl_Id := New_Copy (Defining_Entity (N));
2396 Set_Comes_From_Source (Act_Decl_Id, True);
2398 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then
2400 Make_Defining_Program_Unit_Name (Loc,
2401 Name => New_Copy_Tree (Name (Defining_Unit_Name (N))),
2402 Defining_Identifier => Act_Decl_Id);
2404 Act_Decl_Name := Act_Decl_Id;
2407 -- Case of instantiation of a formal package
2410 Act_Decl_Id := Defining_Identifier (N);
2411 Act_Decl_Name := Act_Decl_Id;
2414 Generate_Definition (Act_Decl_Id);
2415 Pre_Analyze_Actuals (N);
2418 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
2419 Gen_Unit := Entity (Gen_Id);
2421 -- Verify that it is the name of a generic package
2423 if Etype (Gen_Unit) = Any_Type then
2427 elsif Ekind (Gen_Unit) /= E_Generic_Package then
2429 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause
2431 if From_With_Type (Gen_Unit) then
2433 ("cannot instantiate a limited withed package", Gen_Id);
2436 ("expect name of generic package in instantiation", Gen_Id);
2443 if In_Extended_Main_Source_Unit (N) then
2444 Set_Is_Instantiated (Gen_Unit);
2445 Generate_Reference (Gen_Unit, N);
2447 if Present (Renamed_Object (Gen_Unit)) then
2448 Set_Is_Instantiated (Renamed_Object (Gen_Unit));
2449 Generate_Reference (Renamed_Object (Gen_Unit), N);
2453 if Nkind (Gen_Id) = N_Identifier
2454 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
2457 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
2459 elsif Nkind (Gen_Id) = N_Expanded_Name
2460 and then Is_Child_Unit (Gen_Unit)
2461 and then Nkind (Prefix (Gen_Id)) = N_Identifier
2462 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id))
2465 ("& is hidden within declaration of instance ", Prefix (Gen_Id));
2468 Set_Entity (Gen_Id, Gen_Unit);
2470 -- If generic is a renaming, get original generic unit.
2472 if Present (Renamed_Object (Gen_Unit))
2473 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package
2475 Gen_Unit := Renamed_Object (Gen_Unit);
2478 -- Verify that there are no circular instantiations.
2480 if In_Open_Scopes (Gen_Unit) then
2481 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
2485 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
2486 Error_Msg_Node_2 := Current_Scope;
2488 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
2489 Circularity_Detected := True;
2494 Set_Instance_Env (Gen_Unit, Act_Decl_Id);
2495 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
2497 -- Initialize renamings map, for error checking, and the list
2498 -- that holds private entities whose views have changed between
2499 -- generic definition and instantiation. If this is the instance
2500 -- created to validate an actual package, the instantiation
2501 -- environment is that of the enclosing instance.
2503 Generic_Renamings.Set_Last (0);
2504 Generic_Renamings_HTable.Reset;
2506 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
2508 -- Copy original generic tree, to produce text for instantiation.
2512 (Original_Node (Gen_Decl), Empty, Instantiating => True);
2514 Act_Spec := Specification (Act_Tree);
2516 -- If this is the instance created to validate an actual package,
2517 -- only the formals matter, do not examine the package spec itself.
2519 if Is_Actual_Pack then
2520 Set_Visible_Declarations (Act_Spec, New_List);
2521 Set_Private_Declarations (Act_Spec, New_List);
2525 Analyze_Associations
2527 Generic_Formal_Declarations (Act_Tree),
2528 Generic_Formal_Declarations (Gen_Decl));
2530 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name);
2531 Set_Is_Generic_Instance (Act_Decl_Id);
2533 Set_Generic_Parent (Act_Spec, Gen_Unit);
2535 -- References to the generic in its own declaration or its body
2536 -- are references to the instance. Add a renaming declaration for
2537 -- the generic unit itself. This declaration, as well as the renaming
2538 -- declarations for the generic formals, must remain private to the
2539 -- unit: the formals, because this is the language semantics, and
2540 -- the unit because its use is an artifact of the implementation.
2543 Make_Package_Renaming_Declaration (Loc,
2544 Defining_Unit_Name =>
2545 Make_Defining_Identifier (Loc, Chars (Gen_Unit)),
2546 Name => New_Reference_To (Act_Decl_Id, Loc));
2548 Append (Unit_Renaming, Renaming_List);
2550 -- The renaming declarations are the first local declarations of
2553 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then
2555 (First (Visible_Declarations (Act_Spec)), Renaming_List);
2557 Set_Visible_Declarations (Act_Spec, Renaming_List);
2561 Make_Package_Declaration (Loc,
2562 Specification => Act_Spec);
2564 -- Save the instantiation node, for subsequent instantiation
2565 -- of the body, if there is one and we are generating code for
2566 -- the current unit. Mark the unit as having a body, to avoid
2567 -- a premature error message.
2569 -- We instantiate the body if we are generating code, if we are
2570 -- generating cross-reference information, or if we are building
2571 -- trees for ASIS use.
2574 Enclosing_Body_Present : Boolean := False;
2575 -- If the generic unit is not a compilation unit, then a body
2576 -- may be present in its parent even if none is required. We
2577 -- create a tentative pending instantiation for the body, which
2578 -- will be discarded if none is actually present.
2583 if Scope (Gen_Unit) /= Standard_Standard
2584 and then not Is_Child_Unit (Gen_Unit)
2586 Scop := Scope (Gen_Unit);
2588 while Present (Scop)
2589 and then Scop /= Standard_Standard
2591 if Unit_Requires_Body (Scop) then
2592 Enclosing_Body_Present := True;
2595 elsif In_Open_Scopes (Scop)
2596 and then In_Package_Body (Scop)
2598 Enclosing_Body_Present := True;
2602 exit when Is_Compilation_Unit (Scop);
2603 Scop := Scope (Scop);
2607 -- If front-end inlining is enabled, and this is a unit for which
2608 -- code will be generated, we instantiate the body at once.
2609 -- This is done if the instance is not the main unit, and if the
2610 -- generic is not a child unit of another generic, to avoid scope
2611 -- problems and the reinstallation of parent instances.
2613 if Front_End_Inlining
2614 and then Expander_Active
2615 and then (not Is_Child_Unit (Gen_Unit)
2616 or else not Is_Generic_Unit (Scope (Gen_Unit)))
2617 and then (Is_In_Main_Unit (N)
2618 or else In_Main_Context (Current_Scope))
2619 and then Nkind (Parent (N)) /= N_Compilation_Unit
2620 and then Might_Inline_Subp
2621 and then not Is_Actual_Pack
2627 (Unit_Requires_Body (Gen_Unit)
2628 or else Enclosing_Body_Present
2629 or else Present (Corresponding_Body (Gen_Decl)))
2630 and then (Is_In_Main_Unit (N)
2631 or else Might_Inline_Subp)
2632 and then not Is_Actual_Pack
2633 and then not Inline_Now
2635 and then (Operating_Mode = Generate_Code
2636 or else (Operating_Mode = Check_Semantics
2637 and then ASIS_Mode));
2639 -- If front_end_inlining is enabled, do not instantiate a
2640 -- body if within a generic context.
2642 if (Front_End_Inlining
2643 and then not Expander_Active)
2644 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
2646 Needs_Body := False;
2649 -- If the current context is generic, and the package being
2650 -- instantiated is declared within a formal package, there
2651 -- is no body to instantiate until the enclosing generic is
2652 -- instantiated, and there is an actual for the formal
2653 -- package. If the formal package has parameters, we build a
2654 -- regular package instance for it, that preceeds the original
2655 -- formal package declaration.
2657 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then
2659 Decl : constant Node_Id :=
2661 (Unit_Declaration_Node (Scope (Gen_Unit)));
2663 if Nkind (Decl) = N_Formal_Package_Declaration
2664 or else (Nkind (Decl) = N_Package_Declaration
2665 and then Is_List_Member (Decl)
2666 and then Present (Next (Decl))
2668 Nkind (Next (Decl)) = N_Formal_Package_Declaration)
2670 Needs_Body := False;
2676 -- If we are generating the calling stubs from the instantiation
2677 -- of a generic RCI package, we will not use the body of the
2680 if Distribution_Stub_Mode = Generate_Caller_Stub_Body
2681 and then Is_Compilation_Unit (Defining_Entity (N))
2683 Needs_Body := False;
2688 -- Here is a defence against a ludicrous number of instantiations
2689 -- caused by a circular set of instantiation attempts.
2691 if Pending_Instantiations.Last >
2692 Hostparm.Max_Instantiations
2694 Error_Msg_N ("too many instantiations", N);
2695 raise Unrecoverable_Error;
2698 -- Indicate that the enclosing scopes contain an instantiation,
2699 -- and that cleanup actions should be delayed until after the
2700 -- instance body is expanded.
2702 Check_Forward_Instantiation (Gen_Decl);
2703 if Nkind (N) = N_Package_Instantiation then
2705 Enclosing_Master : Entity_Id := Current_Scope;
2708 while Enclosing_Master /= Standard_Standard loop
2710 if Ekind (Enclosing_Master) = E_Package then
2711 if Is_Compilation_Unit (Enclosing_Master) then
2712 if In_Package_Body (Enclosing_Master) then
2714 (Body_Entity (Enclosing_Master));
2723 Enclosing_Master := Scope (Enclosing_Master);
2726 elsif Ekind (Enclosing_Master) = E_Generic_Package then
2727 Enclosing_Master := Scope (Enclosing_Master);
2729 elsif Is_Generic_Subprogram (Enclosing_Master)
2730 or else Ekind (Enclosing_Master) = E_Void
2732 -- Cleanup actions will eventually be performed on
2733 -- the enclosing instance, if any. enclosing scope
2734 -- is void in the formal part of a generic subp.
2739 if Ekind (Enclosing_Master) = E_Entry
2741 Ekind (Scope (Enclosing_Master)) = E_Protected_Type
2744 Protected_Body_Subprogram (Enclosing_Master);
2747 Set_Delay_Cleanups (Enclosing_Master);
2749 while Ekind (Enclosing_Master) = E_Block loop
2750 Enclosing_Master := Scope (Enclosing_Master);
2753 if Is_Subprogram (Enclosing_Master) then
2754 Delay_Descriptors (Enclosing_Master);
2756 elsif Is_Task_Type (Enclosing_Master) then
2758 TBP : constant Node_Id :=
2759 Get_Task_Body_Procedure
2763 if Present (TBP) then
2764 Delay_Descriptors (TBP);
2765 Set_Delay_Cleanups (TBP);
2775 -- Make entry in table
2777 Pending_Instantiations.Increment_Last;
2778 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
2779 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
2783 Set_Categorization_From_Pragmas (Act_Decl);
2785 if Parent_Installed then
2789 Set_Instance_Spec (N, Act_Decl);
2791 -- If not a compilation unit, insert the package declaration
2792 -- before the original instantiation node.
2794 if Nkind (Parent (N)) /= N_Compilation_Unit then
2795 Mark_Rewrite_Insertion (Act_Decl);
2796 Insert_Before (N, Act_Decl);
2799 -- For an instantiation that is a compilation unit, place
2800 -- declaration on current node so context is complete
2801 -- for analysis (including nested instantiations). It this
2802 -- is the main unit, the declaration eventually replaces the
2803 -- instantiation node. If the instance body is later created, it
2804 -- replaces the instance node, and the declation is attached to
2805 -- it (see Build_Instance_Compilation_Unit_Nodes).
2808 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then
2810 -- The entity for the current unit is the newly created one,
2811 -- and all semantic information is attached to it.
2813 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id);
2815 -- If this is the main unit, replace the main entity as well.
2817 if Current_Sem_Unit = Main_Unit then
2818 Main_Unit_Entity := Act_Decl_Id;
2822 Set_Unit (Parent (N), Act_Decl);
2823 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
2825 Set_Unit (Parent (N), N);
2826 Set_Body_Required (Parent (N), False);
2828 -- We never need elaboration checks on instantiations, since
2829 -- by definition, the body instantiation is elaborated at the
2830 -- same time as the spec instantiation.
2832 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
2833 Set_Kill_Elaboration_Checks (Act_Decl_Id);
2836 Check_Elab_Instantiation (N);
2838 if ABE_Is_Certain (N) and then Needs_Body then
2839 Pending_Instantiations.Decrement_Last;
2841 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
2843 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming),
2844 First_Private_Entity (Act_Decl_Id));
2846 -- If the instantiation will receive a body, the unit will
2847 -- be transformed into a package body, and receive its own
2848 -- elaboration entity. Otherwise, the nature of the unit is
2849 -- now a package declaration.
2851 if Nkind (Parent (N)) = N_Compilation_Unit
2852 and then not Needs_Body
2854 Rewrite (N, Act_Decl);
2857 if Present (Corresponding_Body (Gen_Decl))
2858 or else Unit_Requires_Body (Gen_Unit)
2860 Set_Has_Completion (Act_Decl_Id);
2863 Check_Formal_Packages (Act_Decl_Id);
2865 Restore_Private_Views (Act_Decl_Id);
2867 if not Generic_Separately_Compiled (Gen_Unit) then
2868 Inherit_Context (Gen_Decl, N);
2871 if Parent_Installed then
2878 Validate_Categorization_Dependency (N, Act_Decl_Id);
2880 -- Check restriction, but skip this if something went wrong in
2881 -- the above analysis, indicated by Act_Decl_Id being void.
2883 if Ekind (Act_Decl_Id) /= E_Void
2884 and then not Is_Library_Level_Entity (Act_Decl_Id)
2886 Check_Restriction (No_Local_Allocators, N);
2890 Inline_Instance_Body (N, Gen_Unit, Act_Decl);
2893 -- The following is a tree patch for ASIS: ASIS needs separate nodes
2894 -- to be used as defining identifiers for a formal package and for the
2895 -- corresponding expanded package
2897 if Nkind (N) = N_Formal_Package_Declaration then
2898 Act_Decl_Id := New_Copy (Defining_Entity (N));
2899 Set_Comes_From_Source (Act_Decl_Id, True);
2900 Set_Is_Generic_Instance (Act_Decl_Id, False);
2901 Set_Defining_Identifier (N, Act_Decl_Id);
2905 when Instantiation_Error =>
2906 if Parent_Installed then
2909 end Analyze_Package_Instantiation;
2911 --------------------------
2912 -- Inline_Instance_Body --
2913 --------------------------
2915 procedure Inline_Instance_Body
2917 Gen_Unit : Entity_Id;
2921 Gen_Comp : constant Entity_Id :=
2922 Cunit_Entity (Get_Source_Unit (Gen_Unit));
2923 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit);
2924 Curr_Scope : Entity_Id := Empty;
2925 Curr_Unit : constant Entity_Id :=
2926 Cunit_Entity (Current_Sem_Unit);
2927 Removed : Boolean := False;
2928 Num_Scopes : Int := 0;
2929 Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id;
2930 Instances : array (1 .. Scope_Stack.Last) of Entity_Id;
2931 Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id;
2932 Num_Inner : Int := 0;
2933 N_Instances : Int := 0;
2937 -- Case of generic unit defined in another unit. We must remove
2938 -- the complete context of the current unit to install that of
2941 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then
2945 and then S /= Standard_Standard
2947 Num_Scopes := Num_Scopes + 1;
2949 Use_Clauses (Num_Scopes) :=
2951 (Scope_Stack.Last - Num_Scopes + 1).
2953 End_Use_Clauses (Use_Clauses (Num_Scopes));
2955 exit when Is_Generic_Instance (S)
2956 and then (In_Package_Body (S)
2957 or else Ekind (S) = E_Procedure
2958 or else Ekind (S) = E_Function);
2962 Vis := Is_Immediately_Visible (Gen_Comp);
2964 -- Find and save all enclosing instances
2969 and then S /= Standard_Standard
2971 if Is_Generic_Instance (S) then
2972 N_Instances := N_Instances + 1;
2973 Instances (N_Instances) := S;
2975 exit when In_Package_Body (S);
2981 -- Remove context of current compilation unit, unless we
2982 -- are within a nested package instantiation, in which case
2983 -- the context has been removed previously.
2985 -- If current scope is the body of a child unit, remove context
2991 and then S /= Standard_Standard
2993 exit when Is_Generic_Instance (S)
2994 and then (In_Package_Body (S)
2995 or else Ekind (S) = E_Procedure
2996 or else Ekind (S) = E_Function);
2999 or else (Ekind (Curr_Unit) = E_Package_Body
3000 and then S = Spec_Entity (Curr_Unit))
3001 or else (Ekind (Curr_Unit) = E_Subprogram_Body
3004 (Unit_Declaration_Node (Curr_Unit)))
3008 -- Remove entities in current scopes from visibility, so
3009 -- than instance body is compiled in a clean environment.
3011 Save_Scope_Stack (Handle_Use => False);
3013 if Is_Child_Unit (S) then
3015 -- Remove child unit from stack, as well as inner scopes.
3016 -- Removing the context of a child unit removes parent
3019 while Current_Scope /= S loop
3020 Num_Inner := Num_Inner + 1;
3021 Inner_Scopes (Num_Inner) := Current_Scope;
3026 Remove_Context (Curr_Comp);
3030 Remove_Context (Curr_Comp);
3033 if Ekind (Curr_Unit) = E_Package_Body then
3034 Remove_Context (Library_Unit (Curr_Comp));
3041 New_Scope (Standard_Standard);
3042 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True;
3043 Instantiate_Package_Body
3044 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3049 Set_Is_Immediately_Visible (Gen_Comp, Vis);
3051 -- Reset Generic_Instance flag so that use clauses can be installed
3052 -- in the proper order. (See Use_One_Package for effect of enclosing
3053 -- instances on processing of use clauses).
3055 for J in 1 .. N_Instances loop
3056 Set_Is_Generic_Instance (Instances (J), False);
3060 Install_Context (Curr_Comp);
3062 if Present (Curr_Scope)
3063 and then Is_Child_Unit (Curr_Scope)
3065 New_Scope (Curr_Scope);
3066 Set_Is_Immediately_Visible (Curr_Scope);
3068 -- Finally, restore inner scopes as well.
3070 for J in reverse 1 .. Num_Inner loop
3071 New_Scope (Inner_Scopes (J));
3075 Restore_Scope_Stack (Handle_Use => False);
3078 -- Restore use clauses. For a child unit, use clauses in the
3079 -- parents are restored when installing the context, so only
3080 -- those in inner scopes (and those local to the child unit itself)
3081 -- need to be installed explicitly.
3083 if Is_Child_Unit (Curr_Unit)
3086 for J in reverse 1 .. Num_Inner + 1 loop
3087 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3089 Install_Use_Clauses (Use_Clauses (J));
3093 for J in reverse 1 .. Num_Scopes loop
3094 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause :=
3096 Install_Use_Clauses (Use_Clauses (J));
3100 for J in 1 .. N_Instances loop
3101 Set_Is_Generic_Instance (Instances (J), True);
3104 -- If generic unit is in current unit, current context is correct.
3107 Instantiate_Package_Body
3108 ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True);
3110 end Inline_Instance_Body;
3112 -------------------------------------
3113 -- Analyze_Procedure_Instantiation --
3114 -------------------------------------
3116 procedure Analyze_Procedure_Instantiation (N : Node_Id) is
3118 Analyze_Subprogram_Instantiation (N, E_Procedure);
3119 end Analyze_Procedure_Instantiation;
3121 --------------------------------------
3122 -- Analyze_Subprogram_Instantiation --
3123 --------------------------------------
3125 procedure Analyze_Subprogram_Instantiation
3129 Loc : constant Source_Ptr := Sloc (N);
3130 Gen_Id : constant Node_Id := Name (N);
3132 Anon_Id : constant Entity_Id :=
3133 Make_Defining_Identifier (Sloc (Defining_Entity (N)),
3134 Chars => New_External_Name
3135 (Chars (Defining_Entity (N)), 'R'));
3137 Act_Decl_Id : Entity_Id;
3142 Gen_Unit : Entity_Id;
3144 Pack_Id : Entity_Id;
3145 Parent_Installed : Boolean := False;
3146 Renaming_List : List_Id;
3148 procedure Analyze_Instance_And_Renamings;
3149 -- The instance must be analyzed in a context that includes the
3150 -- mappings of generic parameters into actuals. We create a package
3151 -- declaration for this purpose, and a subprogram with an internal
3152 -- name within the package. The subprogram instance is simply an
3153 -- alias for the internal subprogram, declared in the current scope.
3155 ------------------------------------
3156 -- Analyze_Instance_And_Renamings --
3157 ------------------------------------
3159 procedure Analyze_Instance_And_Renamings is
3160 Def_Ent : constant Entity_Id := Defining_Entity (N);
3161 Pack_Decl : Node_Id;
3164 if Nkind (Parent (N)) = N_Compilation_Unit then
3166 -- For the case of a compilation unit, the container package
3167 -- has the same name as the instantiation, to insure that the
3168 -- binder calls the elaboration procedure with the right name.
3169 -- Copy the entity of the instance, which may have compilation
3170 -- level flags (e.g. Is_Child_Unit) set.
3172 Pack_Id := New_Copy (Def_Ent);
3175 -- Otherwise we use the name of the instantiation concatenated
3176 -- with its source position to ensure uniqueness if there are
3177 -- several instantiations with the same name.
3180 Make_Defining_Identifier (Loc,
3181 Chars => New_External_Name
3182 (Related_Id => Chars (Def_Ent),
3184 Suffix_Index => Source_Offset (Sloc (Def_Ent))));
3187 Pack_Decl := Make_Package_Declaration (Loc,
3188 Specification => Make_Package_Specification (Loc,
3189 Defining_Unit_Name => Pack_Id,
3190 Visible_Declarations => Renaming_List,
3191 End_Label => Empty));
3193 Set_Instance_Spec (N, Pack_Decl);
3194 Set_Is_Generic_Instance (Pack_Id);
3195 Set_Needs_Debug_Info (Pack_Id);
3197 -- Case of not a compilation unit
3199 if Nkind (Parent (N)) /= N_Compilation_Unit then
3200 Mark_Rewrite_Insertion (Pack_Decl);
3201 Insert_Before (N, Pack_Decl);
3202 Set_Has_Completion (Pack_Id);
3204 -- Case of an instantiation that is a compilation unit
3206 -- Place declaration on current node so context is complete
3207 -- for analysis (including nested instantiations), and for
3208 -- use in a context_clause (see Analyze_With_Clause).
3211 Set_Unit (Parent (N), Pack_Decl);
3212 Set_Parent_Spec (Pack_Decl, Parent_Spec (N));
3215 Analyze (Pack_Decl);
3216 Check_Formal_Packages (Pack_Id);
3217 Set_Is_Generic_Instance (Pack_Id, False);
3219 -- Body of the enclosing package is supplied when instantiating
3220 -- the subprogram body, after semantic analysis is completed.
3222 if Nkind (Parent (N)) = N_Compilation_Unit then
3224 -- Remove package itself from visibility, so it does not
3225 -- conflict with subprogram.
3227 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id));
3229 -- Set name and scope of internal subprogram so that the
3230 -- proper external name will be generated. The proper scope
3231 -- is the scope of the wrapper package. We need to generate
3232 -- debugging information for the internal subprogram, so set
3233 -- flag accordingly.
3235 Set_Chars (Anon_Id, Chars (Defining_Entity (N)));
3236 Set_Scope (Anon_Id, Scope (Pack_Id));
3238 -- Mark wrapper package as referenced, to avoid spurious
3239 -- warnings if the instantiation appears in various with_
3240 -- clauses of subunits of the main unit.
3242 Set_Referenced (Pack_Id);
3245 Set_Is_Generic_Instance (Anon_Id);
3246 Set_Needs_Debug_Info (Anon_Id);
3247 Act_Decl_Id := New_Copy (Anon_Id);
3249 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3250 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N)));
3251 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N)));
3252 Set_Comes_From_Source (Act_Decl_Id, True);
3254 -- The signature may involve types that are not frozen yet, but
3255 -- the subprogram will be frozen at the point the wrapper package
3256 -- is frozen, so it does not need its own freeze node. In fact, if
3257 -- one is created, it might conflict with the freezing actions from
3258 -- the wrapper package (see 7206-013).
3260 Set_Has_Delayed_Freeze (Anon_Id, False);
3262 -- If the instance is a child unit, mark the Id accordingly. Mark
3263 -- the anonymous entity as well, which is the real subprogram and
3264 -- which is used when the instance appears in a context clause.
3266 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N)));
3267 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N)));
3268 New_Overloaded_Entity (Act_Decl_Id);
3269 Check_Eliminated (Act_Decl_Id);
3271 -- In compilation unit case, kill elaboration checks on the
3272 -- instantiation, since they are never needed -- the body is
3273 -- instantiated at the same point as the spec.
3275 if Nkind (Parent (N)) = N_Compilation_Unit then
3276 Set_Suppress_Elaboration_Warnings (Act_Decl_Id);
3277 Set_Kill_Elaboration_Checks (Act_Decl_Id);
3278 Set_Is_Compilation_Unit (Anon_Id);
3280 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id);
3283 -- The instance is not a freezing point for the new subprogram.
3285 Set_Is_Frozen (Act_Decl_Id, False);
3287 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then
3288 Valid_Operator_Definition (Act_Decl_Id);
3291 Set_Alias (Act_Decl_Id, Anon_Id);
3292 Set_Parent (Act_Decl_Id, Parent (Anon_Id));
3293 Set_Has_Completion (Act_Decl_Id);
3294 Set_Related_Instance (Pack_Id, Act_Decl_Id);
3296 if Nkind (Parent (N)) = N_Compilation_Unit then
3297 Set_Body_Required (Parent (N), False);
3300 end Analyze_Instance_And_Renamings;
3302 -- Start of processing for Analyze_Subprogram_Instantiation
3305 -- Very first thing: apply the special kludge for Text_IO processing
3306 -- in case we are instantiating one of the children of [Wide_]Text_IO.
3307 -- Of course such an instantiation is bogus (these are packages, not
3308 -- subprograms), but we get a better error message if we do this.
3310 Text_IO_Kludge (Gen_Id);
3312 -- Make node global for error reporting.
3314 Instantiation_Node := N;
3315 Pre_Analyze_Actuals (N);
3318 Check_Generic_Child_Unit (Gen_Id, Parent_Installed);
3319 Gen_Unit := Entity (Gen_Id);
3321 Generate_Reference (Gen_Unit, Gen_Id);
3323 if Nkind (Gen_Id) = N_Identifier
3324 and then Chars (Gen_Unit) = Chars (Defining_Entity (N))
3327 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit);
3330 if Etype (Gen_Unit) = Any_Type then
3335 -- Verify that it is a generic subprogram of the right kind, and that
3336 -- it does not lead to a circular instantiation.
3338 if Ekind (Gen_Unit) /= E_Generic_Procedure
3339 and then Ekind (Gen_Unit) /= E_Generic_Function
3341 Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id);
3343 elsif In_Open_Scopes (Gen_Unit) then
3344 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit);
3346 elsif K = E_Procedure
3347 and then Ekind (Gen_Unit) /= E_Generic_Procedure
3349 if Ekind (Gen_Unit) = E_Generic_Function then
3351 ("cannot instantiate generic function as procedure", Gen_Id);
3354 ("expect name of generic procedure in instantiation", Gen_Id);
3357 elsif K = E_Function
3358 and then Ekind (Gen_Unit) /= E_Generic_Function
3360 if Ekind (Gen_Unit) = E_Generic_Procedure then
3362 ("cannot instantiate generic procedure as function", Gen_Id);
3365 ("expect name of generic function in instantiation", Gen_Id);
3369 Set_Entity (Gen_Id, Gen_Unit);
3370 Set_Is_Instantiated (Gen_Unit);
3372 if In_Extended_Main_Source_Unit (N) then
3373 Generate_Reference (Gen_Unit, N);
3376 -- If renaming, get original unit
3378 if Present (Renamed_Object (Gen_Unit))
3379 and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure
3381 Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function)
3383 Gen_Unit := Renamed_Object (Gen_Unit);
3384 Set_Is_Instantiated (Gen_Unit);
3385 Generate_Reference (Gen_Unit, N);
3388 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then
3389 Error_Msg_Node_2 := Current_Scope;
3391 ("circular Instantiation: & instantiated in &!", N, Gen_Unit);
3392 Circularity_Detected := True;
3396 Gen_Decl := Unit_Declaration_Node (Gen_Unit);
3398 -- The subprogram itself cannot contain a nested instance, so
3399 -- the current parent is left empty.
3401 Set_Instance_Env (Gen_Unit, Empty);
3403 -- Initialize renamings map, for error checking.
3405 Generic_Renamings.Set_Last (0);
3406 Generic_Renamings_HTable.Reset;
3408 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment);
3410 -- Copy original generic tree, to produce text for instantiation.
3414 (Original_Node (Gen_Decl), Empty, Instantiating => True);
3416 Act_Spec := Specification (Act_Tree);
3418 Analyze_Associations
3420 Generic_Formal_Declarations (Act_Tree),
3421 Generic_Formal_Declarations (Gen_Decl));
3423 -- Build the subprogram declaration, which does not appear
3424 -- in the generic template, and give it a sloc consistent
3425 -- with that of the template.
3427 Set_Defining_Unit_Name (Act_Spec, Anon_Id);
3428 Set_Generic_Parent (Act_Spec, Gen_Unit);
3430 Make_Subprogram_Declaration (Sloc (Act_Spec),
3431 Specification => Act_Spec);
3433 Set_Categorization_From_Pragmas (Act_Decl);
3435 if Parent_Installed then
3439 Append (Act_Decl, Renaming_List);
3440 Analyze_Instance_And_Renamings;
3442 -- If the generic is marked Import (Intrinsic), then so is the
3443 -- instance. This indicates that there is no body to instantiate.
3444 -- If generic is marked inline, so it the instance, and the
3445 -- anonymous subprogram it renames. If inlined, or else if inlining
3446 -- is enabled for the compilation, we generate the instance body
3447 -- even if it is not within the main unit.
3449 -- Any other pragmas might also be inherited ???
3451 if Is_Intrinsic_Subprogram (Gen_Unit) then
3452 Set_Is_Intrinsic_Subprogram (Anon_Id);
3453 Set_Is_Intrinsic_Subprogram (Act_Decl_Id);
3455 if Chars (Gen_Unit) = Name_Unchecked_Conversion then
3456 Validate_Unchecked_Conversion (N, Act_Decl_Id);
3460 Generate_Definition (Act_Decl_Id);
3462 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit));
3463 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit));
3465 if not Is_Intrinsic_Subprogram (Gen_Unit) then
3466 Check_Elab_Instantiation (N);
3469 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id);
3471 -- Subject to change, pending on if other pragmas are inherited ???
3473 Validate_Categorization_Dependency (N, Act_Decl_Id);
3475 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then
3477 if not Generic_Separately_Compiled (Gen_Unit) then
3478 Inherit_Context (Gen_Decl, N);
3481 Restore_Private_Views (Pack_Id, False);
3483 -- If the context requires a full instantiation, mark node for
3484 -- subsequent construction of the body.
3486 if (Is_In_Main_Unit (N)
3487 or else Is_Inlined (Act_Decl_Id))
3488 and then (Operating_Mode = Generate_Code
3489 or else (Operating_Mode = Check_Semantics
3490 and then ASIS_Mode))
3491 and then (Expander_Active or else ASIS_Mode)
3492 and then not ABE_Is_Certain (N)
3493 and then not Is_Eliminated (Act_Decl_Id)
3495 Pending_Instantiations.Increment_Last;
3496 Pending_Instantiations.Table (Pending_Instantiations.Last) :=
3497 (N, Act_Decl, Expander_Active, Current_Sem_Unit);
3498 Check_Forward_Instantiation (Gen_Decl);
3500 -- The wrapper package is always delayed, because it does
3501 -- not constitute a freeze point, but to insure that the
3502 -- freeze node is placed properly, it is created directly
3503 -- when instantiating the body (otherwise the freeze node
3504 -- might appear to early for nested instantiations).
3506 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3508 -- For ASIS purposes, indicate that the wrapper package has
3509 -- replaced the instantiation node.
3511 Rewrite (N, Unit (Parent (N)));
3512 Set_Unit (Parent (N), N);
3515 elsif Nkind (Parent (N)) = N_Compilation_Unit then
3517 -- Replace instance node for library-level instantiations
3518 -- of intrinsic subprograms, for ASIS use.
3520 Rewrite (N, Unit (Parent (N)));
3521 Set_Unit (Parent (N), N);
3524 if Parent_Installed then
3529 Generic_Renamings.Set_Last (0);
3530 Generic_Renamings_HTable.Reset;
3534 when Instantiation_Error =>
3535 if Parent_Installed then
3538 end Analyze_Subprogram_Instantiation;
3540 -------------------------
3541 -- Get_Associated_Node --
3542 -------------------------
3544 function Get_Associated_Node (N : Node_Id) return Node_Id is
3545 Assoc : Node_Id := Associated_Node (N);
3548 if Nkind (Assoc) /= Nkind (N) then
3551 elsif Nkind (Assoc) = N_Aggregate
3552 or else Nkind (Assoc) = N_Extension_Aggregate
3557 -- If the node is part of an inner generic, it may itself have been
3558 -- remapped into a further generic copy. Associated_Node is otherwise
3559 -- used for the entity of the node, and will be of a different node
3560 -- kind, or else N has been rewritten as a literal or function call.
3562 while Present (Associated_Node (Assoc))
3563 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc)
3565 Assoc := Associated_Node (Assoc);
3568 -- Follow and additional link in case the final node was rewritten.
3569 -- This can only happen with nested generic units.
3571 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op)
3572 and then Present (Associated_Node (Assoc))
3573 and then (Nkind (Associated_Node (Assoc)) = N_Function_Call
3575 Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference
3577 Nkind (Associated_Node (Assoc)) = N_Integer_Literal
3579 Nkind (Associated_Node (Assoc)) = N_Real_Literal
3581 Nkind (Associated_Node (Assoc)) = N_String_Literal)
3583 Assoc := Associated_Node (Assoc);
3588 end Get_Associated_Node;
3590 -------------------------------------------
3591 -- Build_Instance_Compilation_Unit_Nodes --
3592 -------------------------------------------
3594 procedure Build_Instance_Compilation_Unit_Nodes
3599 Decl_Cunit : Node_Id;
3600 Body_Cunit : Node_Id;
3602 New_Main : constant Entity_Id := Defining_Entity (Act_Decl);
3603 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit);
3606 -- A new compilation unit node is built for the instance declaration
3609 Make_Compilation_Unit (Sloc (N),
3610 Context_Items => Empty_List,
3613 Make_Compilation_Unit_Aux (Sloc (N)));
3615 Set_Parent_Spec (Act_Decl, Parent_Spec (N));
3616 Set_Body_Required (Decl_Cunit, True);
3618 -- We use the original instantiation compilation unit as the resulting
3619 -- compilation unit of the instance, since this is the main unit.
3621 Rewrite (N, Act_Body);
3622 Body_Cunit := Parent (N);
3624 -- The two compilation unit nodes are linked by the Library_Unit field
3626 Set_Library_Unit (Decl_Cunit, Body_Cunit);
3627 Set_Library_Unit (Body_Cunit, Decl_Cunit);
3629 -- Preserve the private nature of the package if needed.
3631 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit));
3633 -- If the instance is not the main unit, its context, categorization,
3634 -- and elaboration entity are not relevant to the compilation.
3636 if Parent (N) /= Cunit (Main_Unit) then
3640 -- The context clause items on the instantiation, which are now
3641 -- attached to the body compilation unit (since the body overwrote
3642 -- the original instantiation node), semantically belong on the spec,
3643 -- so copy them there. It's harmless to leave them on the body as well.
3644 -- In fact one could argue that they belong in both places.
3646 Citem := First (Context_Items (Body_Cunit));
3647 while Present (Citem) loop
3648 Append (New_Copy (Citem), Context_Items (Decl_Cunit));
3652 -- Propagate categorization flags on packages, so that they appear
3653 -- in ali file for the spec of the unit.
3655 if Ekind (New_Main) = E_Package then
3656 Set_Is_Pure (Old_Main, Is_Pure (New_Main));
3657 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main));
3658 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main));
3659 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main));
3660 Set_Is_Remote_Call_Interface
3661 (Old_Main, Is_Remote_Call_Interface (New_Main));
3664 -- Make entry in Units table, so that binder can generate call to
3665 -- elaboration procedure for body, if any.
3667 Make_Instance_Unit (Body_Cunit);
3668 Main_Unit_Entity := New_Main;
3669 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity);
3671 -- Build elaboration entity, since the instance may certainly
3672 -- generate elaboration code requiring a flag for protection.
3674 Build_Elaboration_Entity (Decl_Cunit, New_Main);
3675 end Build_Instance_Compilation_Unit_Nodes;
3677 -----------------------------------
3678 -- Check_Formal_Package_Instance --
3679 -----------------------------------
3681 -- If the formal has specific parameters, they must match those of the
3682 -- actual. Both of them are instances, and the renaming declarations
3683 -- for their formal parameters appear in the same order in both. The
3684 -- analyzed formal has been analyzed in the context of the current
3687 procedure Check_Formal_Package_Instance
3688 (Formal_Pack : Entity_Id;
3689 Actual_Pack : Entity_Id)
3691 E1 : Entity_Id := First_Entity (Actual_Pack);
3692 E2 : Entity_Id := First_Entity (Formal_Pack);
3697 procedure Check_Mismatch (B : Boolean);
3698 -- Common error routine for mismatch between the parameters of
3699 -- the actual instance and those of the formal package.
3701 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean;
3702 -- The formal may come from a nested formal package, and the actual
3703 -- may have been constant-folded. To determine whether the two denote
3704 -- the same entity we may have to traverse several definitions to
3705 -- recover the ultimate entity that they refer to.
3707 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean;
3708 -- Similarly, if the formal comes from a nested formal package, the
3709 -- actual may designate the formal through multiple renamings, which
3710 -- have to be followed to determine the original variable in question.
3712 --------------------
3713 -- Check_Mismatch --
3714 --------------------
3716 procedure Check_Mismatch (B : Boolean) is
3720 ("actual for & in actual instance does not match formal",
3721 Parent (Actual_Pack), E1);
3725 --------------------------------
3726 -- Same_Instantiated_Constant --
3727 --------------------------------
3729 function Same_Instantiated_Constant
3730 (E1, E2 : Entity_Id) return Boolean
3735 while Present (Ent) loop
3739 elsif Ekind (Ent) /= E_Constant then
3742 elsif Is_Entity_Name (Constant_Value (Ent)) then
3743 if Entity (Constant_Value (Ent)) = E1 then
3746 Ent := Entity (Constant_Value (Ent));
3749 -- The actual may be a constant that has been folded. Recover
3752 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then
3753 Ent := Entity (Original_Node (Constant_Value (Ent)));
3760 end Same_Instantiated_Constant;
3762 --------------------------------
3763 -- Same_Instantiated_Variable --
3764 --------------------------------
3766 function Same_Instantiated_Variable
3767 (E1, E2 : Entity_Id) return Boolean
3769 function Original_Entity (E : Entity_Id) return Entity_Id;
3770 -- Follow chain of renamings to the ultimate ancestor.
3772 ---------------------
3773 -- Original_Entity --
3774 ---------------------
3776 function Original_Entity (E : Entity_Id) return Entity_Id is
3781 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration
3782 and then Present (Renamed_Object (Orig))
3783 and then Is_Entity_Name (Renamed_Object (Orig))
3785 Orig := Entity (Renamed_Object (Orig));
3789 end Original_Entity;
3791 -- Start of processing for Same_Instantiated_Variable
3794 return Ekind (E1) = Ekind (E2)
3795 and then Original_Entity (E1) = Original_Entity (E2);
3796 end Same_Instantiated_Variable;
3798 -- Start of processing for Check_Formal_Package_Instance
3802 and then Present (E2)
3804 exit when Ekind (E1) = E_Package
3805 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack);
3807 if Is_Type (E1) then
3809 -- Subtypes must statically match. E1 and E2 are the
3810 -- local entities that are subtypes of the actuals.
3811 -- Itypes generated for other parameters need not be checked,
3812 -- the check will be performed on the parameters themselves.
3814 if not Is_Itype (E1)
3815 and then not Is_Itype (E2)
3819 or else Etype (E1) /= Etype (E2)
3820 or else not Subtypes_Statically_Match (E1, E2));
3823 elsif Ekind (E1) = E_Constant then
3825 -- IN parameters must denote the same static value, or
3826 -- the same constant, or the literal null.
3828 Expr1 := Expression (Parent (E1));
3830 if Ekind (E2) /= E_Constant then
3831 Check_Mismatch (True);
3834 Expr2 := Expression (Parent (E2));
3837 if Is_Static_Expression (Expr1) then
3839 if not Is_Static_Expression (Expr2) then
3840 Check_Mismatch (True);
3842 elsif Is_Integer_Type (Etype (E1)) then
3845 V1 : constant Uint := Expr_Value (Expr1);
3846 V2 : constant Uint := Expr_Value (Expr2);
3848 Check_Mismatch (V1 /= V2);
3851 elsif Is_Real_Type (Etype (E1)) then
3853 V1 : constant Ureal := Expr_Value_R (Expr1);
3854 V2 : constant Ureal := Expr_Value_R (Expr2);
3856 Check_Mismatch (V1 /= V2);
3859 elsif Is_String_Type (Etype (E1))
3860 and then Nkind (Expr1) = N_String_Literal
3863 if Nkind (Expr2) /= N_String_Literal then
3864 Check_Mismatch (True);
3867 (not String_Equal (Strval (Expr1), Strval (Expr2)));
3871 elsif Is_Entity_Name (Expr1) then
3872 if Is_Entity_Name (Expr2) then
3873 if Entity (Expr1) = Entity (Expr2) then
3877 (not Same_Instantiated_Constant
3878 (Entity (Expr1), Entity (Expr2)));
3881 Check_Mismatch (True);
3884 elsif Is_Entity_Name (Original_Node (Expr1))
3885 and then Is_Entity_Name (Expr2)
3887 Same_Instantiated_Constant
3888 (Entity (Original_Node (Expr1)), Entity (Expr2))
3892 elsif Nkind (Expr1) = N_Null then
3893 Check_Mismatch (Nkind (Expr1) /= N_Null);
3896 Check_Mismatch (True);
3899 elsif Ekind (E1) = E_Variable then
3900 Check_Mismatch (not Same_Instantiated_Variable (E1, E2));
3902 elsif Ekind (E1) = E_Package then
3904 (Ekind (E1) /= Ekind (E2)
3905 or else Renamed_Object (E1) /= Renamed_Object (E2));
3907 elsif Is_Overloadable (E1) then
3909 -- Verify that the names of the entities match.
3910 -- What if actual is an attribute ???
3913 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2));
3916 raise Program_Error;
3923 end Check_Formal_Package_Instance;
3925 ---------------------------
3926 -- Check_Formal_Packages --
3927 ---------------------------
3929 procedure Check_Formal_Packages (P_Id : Entity_Id) is
3931 Formal_P : Entity_Id;
3934 -- Iterate through the declarations in the instance, looking for
3935 -- package renaming declarations that denote instances of formal
3936 -- packages. Stop when we find the renaming of the current package
3937 -- itself. The declaration for a formal package without a box is
3938 -- followed by an internal entity that repeats the instantiation.
3940 E := First_Entity (P_Id);
3941 while Present (E) loop
3942 if Ekind (E) = E_Package then
3943 if Renamed_Object (E) = P_Id then
3946 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
3949 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then
3950 Formal_P := Next_Entity (E);
3951 Check_Formal_Package_Instance (Formal_P, E);
3957 end Check_Formal_Packages;
3959 ---------------------------------
3960 -- Check_Forward_Instantiation --
3961 ---------------------------------
3963 procedure Check_Forward_Instantiation (Decl : Node_Id) is
3965 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl));
3968 -- The instantiation appears before the generic body if we are in the
3969 -- scope of the unit containing the generic, either in its spec or in
3970 -- the package body. and before the generic body.
3972 if Ekind (Gen_Comp) = E_Package_Body then
3973 Gen_Comp := Spec_Entity (Gen_Comp);
3976 if In_Open_Scopes (Gen_Comp)
3977 and then No (Corresponding_Body (Decl))
3982 and then not Is_Compilation_Unit (S)
3983 and then not Is_Child_Unit (S)
3985 if Ekind (S) = E_Package then
3986 Set_Has_Forward_Instantiation (S);
3992 end Check_Forward_Instantiation;
3994 ---------------------------
3995 -- Check_Generic_Actuals --
3996 ---------------------------
3998 -- The visibility of the actuals may be different between the
3999 -- point of generic instantiation and the instantiation of the body.
4001 procedure Check_Generic_Actuals
4002 (Instance : Entity_Id;
4003 Is_Formal_Box : Boolean)
4008 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean;
4009 -- For a formal that is an array type, the component type is often
4010 -- a previous formal in the same unit. The privacy status of the
4011 -- component type will have been examined earlier in the traversal
4012 -- of the corresponding actuals, and this status should not be
4013 -- modified for the array type itself.
4014 -- To detect this case we have to rescan the list of formals, which
4015 -- is usually short enough to ignore the resulting inefficiency.
4017 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is
4020 Prev := First_Entity (Instance);
4021 while Present (Prev) loop
4023 and then Nkind (Parent (Prev)) = N_Subtype_Declaration
4024 and then Is_Entity_Name (Subtype_Indication (Parent (Prev)))
4025 and then Entity (Subtype_Indication (Parent (Prev))) = Typ
4035 end Denotes_Previous_Actual;
4037 -- Start of processing for Check_Generic_Actuals
4040 E := First_Entity (Instance);
4041 while Present (E) loop
4043 and then Nkind (Parent (E)) = N_Subtype_Declaration
4044 and then Scope (Etype (E)) /= Instance
4045 and then Is_Entity_Name (Subtype_Indication (Parent (E)))
4047 if Is_Array_Type (E)
4048 and then Denotes_Previous_Actual (Component_Type (E))
4052 Check_Private_View (Subtype_Indication (Parent (E)));
4054 Set_Is_Generic_Actual_Type (E, True);
4055 Set_Is_Hidden (E, False);
4056 Set_Is_Potentially_Use_Visible (E,
4059 -- We constructed the generic actual type as a subtype of
4060 -- the supplied type. This means that it normally would not
4061 -- inherit subtype specific attributes of the actual, which
4062 -- is wrong for the generic case.
4064 Astype := Ancestor_Subtype (E);
4068 -- can happen when E is an itype that is the full view of
4069 -- a private type completed, e.g. with a constrained array.
4071 Astype := Base_Type (E);
4074 Set_Size_Info (E, (Astype));
4075 Set_RM_Size (E, RM_Size (Astype));
4076 Set_First_Rep_Item (E, First_Rep_Item (Astype));
4078 if Is_Discrete_Or_Fixed_Point_Type (E) then
4079 Set_RM_Size (E, RM_Size (Astype));
4081 -- In nested instances, the base type of an access actual
4082 -- may itself be private, and need to be exchanged.
4084 elsif Is_Access_Type (E)
4085 and then Is_Private_Type (Etype (E))
4088 (New_Occurrence_Of (Etype (E), Sloc (Instance)));
4091 elsif Ekind (E) = E_Package then
4093 -- If this is the renaming for the current instance, we're done.
4094 -- Otherwise it is a formal package. If the corresponding formal
4095 -- was declared with a box, the (instantiations of the) generic
4096 -- formal part are also visible. Otherwise, ignore the entity
4097 -- created to validate the actuals.
4099 if Renamed_Object (E) = Instance then
4102 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
4105 -- The visibility of a formal of an enclosing generic is already
4108 elsif Denotes_Formal_Package (E) then
4111 elsif Present (Associated_Formal_Package (E)) then
4112 if Box_Present (Parent (Associated_Formal_Package (E))) then
4113 Check_Generic_Actuals (Renamed_Object (E), True);
4116 Set_Is_Hidden (E, False);
4119 -- If this is a subprogram instance (in a wrapper package) the
4120 -- actual is fully visible.
4122 elsif Is_Wrapper_Package (Instance) then
4123 Set_Is_Hidden (E, False);
4126 Set_Is_Hidden (E, not Is_Formal_Box);
4131 end Check_Generic_Actuals;
4133 ------------------------------
4134 -- Check_Generic_Child_Unit --
4135 ------------------------------
4137 procedure Check_Generic_Child_Unit
4139 Parent_Installed : in out Boolean)
4141 Loc : constant Source_Ptr := Sloc (Gen_Id);
4142 Gen_Par : Entity_Id := Empty;
4143 Inst_Par : Entity_Id;
4147 function Find_Generic_Child
4149 Id : Node_Id) return Entity_Id;
4150 -- Search generic parent for possible child unit with the given name.
4152 function In_Enclosing_Instance return Boolean;
4153 -- Within an instance of the parent, the child unit may be denoted
4154 -- by a simple name, or an abbreviated expanded name. Examine enclosing
4155 -- scopes to locate a possible parent instantiation.
4157 ------------------------
4158 -- Find_Generic_Child --
4159 ------------------------
4161 function Find_Generic_Child
4163 Id : Node_Id) return Entity_Id
4168 -- If entity of name is already set, instance has already been
4169 -- resolved, e.g. in an enclosing instantiation.
4171 if Present (Entity (Id)) then
4172 if Scope (Entity (Id)) = Scop then
4179 E := First_Entity (Scop);
4180 while Present (E) loop
4181 if Chars (E) = Chars (Id)
4182 and then Is_Child_Unit (E)
4184 if Is_Child_Unit (E)
4185 and then not Is_Visible_Child_Unit (E)
4188 ("generic child unit& is not visible", Gen_Id, E);
4200 end Find_Generic_Child;
4202 ---------------------------
4203 -- In_Enclosing_Instance --
4204 ---------------------------
4206 function In_Enclosing_Instance return Boolean is
4207 Enclosing_Instance : Node_Id;
4208 Instance_Decl : Node_Id;
4211 Enclosing_Instance := Current_Scope;
4213 while Present (Enclosing_Instance) loop
4214 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance);
4216 if Ekind (Enclosing_Instance) = E_Package
4217 and then Is_Generic_Instance (Enclosing_Instance)
4219 (Generic_Parent (Specification (Instance_Decl)))
4221 -- Check whether the generic we are looking for is a child
4222 -- of this instance.
4224 E := Find_Generic_Child
4225 (Generic_Parent (Specification (Instance_Decl)), Gen_Id);
4226 exit when Present (E);
4232 Enclosing_Instance := Scope (Enclosing_Instance);
4244 Make_Expanded_Name (Loc,
4246 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc),
4247 Selector_Name => New_Occurrence_Of (E, Loc)));
4249 Set_Entity (Gen_Id, E);
4250 Set_Etype (Gen_Id, Etype (E));
4251 Parent_Installed := False; -- Already in scope.
4254 end In_Enclosing_Instance;
4256 -- Start of processing for Check_Generic_Child_Unit
4259 -- If the name of the generic is given by a selected component, it
4260 -- may be the name of a generic child unit, and the prefix is the name
4261 -- of an instance of the parent, in which case the child unit must be
4262 -- visible. If this instance is not in scope, it must be placed there
4263 -- and removed after instantiation, because what is being instantiated
4264 -- is not the original child, but the corresponding child present in
4265 -- the instance of the parent.
4267 -- If the child is instantiated within the parent, it can be given by
4268 -- a simple name. In this case the instance is already in scope, but
4269 -- the child generic must be recovered from the generic parent as well.
4271 if Nkind (Gen_Id) = N_Selected_Component then
4272 S := Selector_Name (Gen_Id);
4273 Analyze (Prefix (Gen_Id));
4274 Inst_Par := Entity (Prefix (Gen_Id));
4276 if Ekind (Inst_Par) = E_Package
4277 and then Present (Renamed_Object (Inst_Par))
4279 Inst_Par := Renamed_Object (Inst_Par);
4282 if Ekind (Inst_Par) = E_Package then
4283 if Nkind (Parent (Inst_Par)) = N_Package_Specification then
4284 Gen_Par := Generic_Parent (Parent (Inst_Par));
4286 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name
4288 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification
4290 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par)));
4293 elsif Ekind (Inst_Par) = E_Generic_Package
4294 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration
4296 -- A formal package may be a real child package, and not the
4297 -- implicit instance within a parent. In this case the child is
4298 -- not visible and has to be retrieved explicitly as well.
4300 Gen_Par := Inst_Par;
4303 if Present (Gen_Par) then
4305 -- The prefix denotes an instantiation. The entity itself
4306 -- may be a nested generic, or a child unit.
4308 E := Find_Generic_Child (Gen_Par, S);
4311 Change_Selected_Component_To_Expanded_Name (Gen_Id);
4312 Set_Entity (Gen_Id, E);
4313 Set_Etype (Gen_Id, Etype (E));
4315 Set_Etype (S, Etype (E));
4317 -- Indicate that this is a reference to the parent.
4319 if In_Extended_Main_Source_Unit (Gen_Id) then
4320 Set_Is_Instantiated (Inst_Par);
4323 -- A common mistake is to replicate the naming scheme of
4324 -- a hierarchy by instantiating a generic child directly,
4325 -- rather than the implicit child in a parent instance:
4327 -- generic .. package Gpar is ..
4328 -- generic .. package Gpar.Child is ..
4329 -- package Par is new Gpar ();
4332 -- package Par.Child is new Gpar.Child ();
4333 -- rather than Par.Child
4335 -- In this case the instantiation is within Par, which is
4336 -- an instance, but Gpar does not denote Par because we are
4337 -- not IN the instance of Gpar, so this is illegal. The test
4338 -- below recognizes this particular case.
4340 if Is_Child_Unit (E)
4341 and then not Comes_From_Source (Entity (Prefix (Gen_Id)))
4342 and then (not In_Instance
4343 or else Nkind (Parent (Parent (Gen_Id))) =
4347 ("prefix of generic child unit must be instance of parent",
4351 if not In_Open_Scopes (Inst_Par)
4352 and then Nkind (Parent (Gen_Id)) not in
4353 N_Generic_Renaming_Declaration
4355 Install_Parent (Inst_Par);
4356 Parent_Installed := True;
4360 -- If the generic parent does not contain an entity that
4361 -- corresponds to the selector, the instance doesn't either.
4362 -- Analyzing the node will yield the appropriate error message.
4363 -- If the entity is not a child unit, then it is an inner
4364 -- generic in the parent.
4372 if Is_Child_Unit (Entity (Gen_Id))
4374 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4375 and then not In_Open_Scopes (Inst_Par)
4377 Install_Parent (Inst_Par);
4378 Parent_Installed := True;
4382 elsif Nkind (Gen_Id) = N_Expanded_Name then
4384 -- Entity already present, analyze prefix, whose meaning may be
4385 -- an instance in the current context. If it is an instance of
4386 -- a relative within another, the proper parent may still have
4387 -- to be installed, if they are not of the same generation.
4389 Analyze (Prefix (Gen_Id));
4390 Inst_Par := Entity (Prefix (Gen_Id));
4392 if In_Enclosing_Instance then
4395 elsif Present (Entity (Gen_Id))
4396 and then Is_Child_Unit (Entity (Gen_Id))
4397 and then not In_Open_Scopes (Inst_Par)
4399 Install_Parent (Inst_Par);
4400 Parent_Installed := True;
4403 elsif In_Enclosing_Instance then
4405 -- The child unit is found in some enclosing scope
4412 -- If this is the renaming of the implicit child in a parent
4413 -- instance, recover the parent name and install it.
4415 if Is_Entity_Name (Gen_Id) then
4416 E := Entity (Gen_Id);
4418 if Is_Generic_Unit (E)
4419 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration
4420 and then Is_Child_Unit (Renamed_Object (E))
4421 and then Is_Generic_Unit (Scope (Renamed_Object (E)))
4422 and then Nkind (Name (Parent (E))) = N_Expanded_Name
4425 New_Copy_Tree (Name (Parent (E))));
4426 Inst_Par := Entity (Prefix (Gen_Id));
4428 if not In_Open_Scopes (Inst_Par) then
4429 Install_Parent (Inst_Par);
4430 Parent_Installed := True;
4433 -- If it is a child unit of a non-generic parent, it may be
4434 -- use-visible and given by a direct name. Install parent as
4437 elsif Is_Generic_Unit (E)
4438 and then Is_Child_Unit (E)
4440 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration
4441 and then not Is_Generic_Unit (Scope (E))
4443 if not In_Open_Scopes (Scope (E)) then
4444 Install_Parent (Scope (E));
4445 Parent_Installed := True;
4450 end Check_Generic_Child_Unit;
4452 -----------------------------
4453 -- Check_Hidden_Child_Unit --
4454 -----------------------------
4456 procedure Check_Hidden_Child_Unit
4458 Gen_Unit : Entity_Id;
4459 Act_Decl_Id : Entity_Id)
4461 Gen_Id : constant Node_Id := Name (N);
4464 if Is_Child_Unit (Gen_Unit)
4465 and then Is_Child_Unit (Act_Decl_Id)
4466 and then Nkind (Gen_Id) = N_Expanded_Name
4467 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id)
4468 and then Chars (Gen_Unit) = Chars (Act_Decl_Id)
4470 Error_Msg_Node_2 := Scope (Act_Decl_Id);
4472 ("generic unit & is implicitly declared in &",
4473 Defining_Unit_Name (N), Gen_Unit);
4474 Error_Msg_N ("\instance must have different name",
4475 Defining_Unit_Name (N));
4477 end Check_Hidden_Child_Unit;
4479 ------------------------
4480 -- Check_Private_View --
4481 ------------------------
4483 procedure Check_Private_View (N : Node_Id) is
4484 T : constant Entity_Id := Etype (N);
4488 -- Exchange views if the type was not private in the generic but is
4489 -- private at the point of instantiation. Do not exchange views if
4490 -- the scope of the type is in scope. This can happen if both generic
4491 -- and instance are sibling units, or if type is defined in a parent.
4492 -- In this case the visibility of the type will be correct for all
4496 BT := Base_Type (T);
4498 if Is_Private_Type (T)
4499 and then not Has_Private_View (N)
4500 and then Present (Full_View (T))
4501 and then not In_Open_Scopes (Scope (T))
4503 -- In the generic, the full type was visible. Save the
4504 -- private entity, for subsequent exchange.
4508 elsif Has_Private_View (N)
4509 and then not Is_Private_Type (T)
4510 and then not Has_Been_Exchanged (T)
4511 and then Etype (Get_Associated_Node (N)) /= T
4513 -- Only the private declaration was visible in the generic. If
4514 -- the type appears in a subtype declaration, the subtype in the
4515 -- instance must have a view compatible with that of its parent,
4516 -- which must be exchanged (see corresponding code in Restore_
4517 -- Private_Views). Otherwise, if the type is defined in a parent
4518 -- unit, leave full visibility within instance, which is safe.
4520 if In_Open_Scopes (Scope (Base_Type (T)))
4521 and then not Is_Private_Type (Base_Type (T))
4522 and then Comes_From_Source (Base_Type (T))
4526 elsif Nkind (Parent (N)) = N_Subtype_Declaration
4527 or else not In_Private_Part (Scope (Base_Type (T)))
4529 Append_Elmt (T, Exchanged_Views);
4530 Exchange_Declarations (Etype (Get_Associated_Node (N)));
4533 -- For composite types with inconsistent representation
4534 -- exchange component types accordingly.
4536 elsif Is_Access_Type (T)
4537 and then Is_Private_Type (Designated_Type (T))
4538 and then not Has_Private_View (N)
4539 and then Present (Full_View (Designated_Type (T)))
4541 Switch_View (Designated_Type (T));
4543 elsif Is_Array_Type (T)
4544 and then Is_Private_Type (Component_Type (T))
4545 and then not Has_Private_View (N)
4546 and then Present (Full_View (Component_Type (T)))
4548 Switch_View (Component_Type (T));
4550 elsif Is_Private_Type (T)
4551 and then Present (Full_View (T))
4552 and then Is_Array_Type (Full_View (T))
4553 and then Is_Private_Type (Component_Type (Full_View (T)))
4557 -- Finally, a non-private subtype may have a private base type,
4558 -- which must be exchanged for consistency. This can happen when
4559 -- instantiating a package body, when the scope stack is empty
4560 -- but in fact the subtype and the base type are declared in an
4563 elsif not Is_Private_Type (T)
4564 and then not Has_Private_View (N)
4565 and then Is_Private_Type (Base_Type (T))
4566 and then Present (Full_View (BT))
4567 and then not Is_Generic_Type (BT)
4568 and then not In_Open_Scopes (BT)
4570 Append_Elmt (Full_View (BT), Exchanged_Views);
4571 Exchange_Declarations (BT);
4574 end Check_Private_View;
4576 --------------------------
4577 -- Contains_Instance_Of --
4578 --------------------------
4580 function Contains_Instance_Of
4583 N : Node_Id) return Boolean
4591 -- Verify that there are no circular instantiations. We check whether
4592 -- the unit contains an instance of the current scope or some enclosing
4593 -- scope (in case one of the instances appears in a subunit). Longer
4594 -- circularities involving subunits might seem too pathological to
4595 -- consider, but they were not too pathological for the authors of
4596 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all
4597 -- enclosing generic scopes as containing an instance.
4600 -- Within a generic subprogram body, the scope is not generic, to
4601 -- allow for recursive subprograms. Use the declaration to determine
4602 -- whether this is a generic unit.
4604 if Ekind (Scop) = E_Generic_Package
4605 or else (Is_Subprogram (Scop)
4606 and then Nkind (Unit_Declaration_Node (Scop)) =
4607 N_Generic_Subprogram_Declaration)
4609 Elmt := First_Elmt (Inner_Instances (Inner));
4611 while Present (Elmt) loop
4612 if Node (Elmt) = Scop then
4613 Error_Msg_Node_2 := Inner;
4615 ("circular Instantiation: & instantiated within &!",
4619 elsif Node (Elmt) = Inner then
4622 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then
4623 Error_Msg_Node_2 := Inner;
4625 ("circular Instantiation: & instantiated within &!",
4633 -- Indicate that Inner is being instantiated within Scop.
4635 Append_Elmt (Inner, Inner_Instances (Scop));
4638 if Scop = Standard_Standard then
4641 Scop := Scope (Scop);
4646 end Contains_Instance_Of;
4648 -----------------------
4649 -- Copy_Generic_Node --
4650 -----------------------
4652 function Copy_Generic_Node
4654 Parent_Id : Node_Id;
4655 Instantiating : Boolean) return Node_Id
4660 function Copy_Generic_Descendant (D : Union_Id) return Union_Id;
4661 -- Check the given value of one of the Fields referenced by the
4662 -- current node to determine whether to copy it recursively. The
4663 -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain
4664 -- value (Sloc, Uint, Char) in which case it need not be copied.
4666 procedure Copy_Descendants;
4667 -- Common utility for various nodes.
4669 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id;
4670 -- Make copy of element list.
4672 function Copy_Generic_List
4674 Parent_Id : Node_Id) return List_Id;
4675 -- Apply Copy_Node recursively to the members of a node list.
4677 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean;
4678 -- True if an identifier is part of the defining program unit name
4679 -- of a child unit. The entity of such an identifier must be kept
4680 -- (for ASIS use) even though as the name of an enclosing generic
4681 -- it would otherwise not be preserved in the generic tree.
4683 ----------------------
4684 -- Copy_Descendants --
4685 ----------------------
4687 procedure Copy_Descendants is
4689 use Atree.Unchecked_Access;
4690 -- This code section is part of the implementation of an untyped
4691 -- tree traversal, so it needs direct access to node fields.
4694 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
4695 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
4696 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
4697 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N)));
4698 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
4699 end Copy_Descendants;
4701 -----------------------------
4702 -- Copy_Generic_Descendant --
4703 -----------------------------
4705 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is
4707 if D = Union_Id (Empty) then
4710 elsif D in Node_Range then
4712 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating));
4714 elsif D in List_Range then
4715 return Union_Id (Copy_Generic_List (List_Id (D), New_N));
4717 elsif D in Elist_Range then
4718 return Union_Id (Copy_Generic_Elist (Elist_Id (D)));
4720 -- Nothing else is copyable (e.g. Uint values), return as is
4725 end Copy_Generic_Descendant;
4727 ------------------------
4728 -- Copy_Generic_Elist --
4729 ------------------------
4731 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is
4738 M := First_Elmt (E);
4739 while Present (M) loop
4741 (Copy_Generic_Node (Node (M), Empty, Instantiating), L);
4750 end Copy_Generic_Elist;
4752 -----------------------
4753 -- Copy_Generic_List --
4754 -----------------------
4756 function Copy_Generic_List
4758 Parent_Id : Node_Id) return List_Id
4766 Set_Parent (New_L, Parent_Id);
4769 while Present (N) loop
4770 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L);
4779 end Copy_Generic_List;
4781 ---------------------------
4782 -- In_Defining_Unit_Name --
4783 ---------------------------
4785 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is
4787 return Present (Parent (Nam))
4788 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name
4790 (Nkind (Parent (Nam)) = N_Expanded_Name
4791 and then In_Defining_Unit_Name (Parent (Nam))));
4792 end In_Defining_Unit_Name;
4794 -- Start of processing for Copy_Generic_Node
4801 New_N := New_Copy (N);
4803 if Instantiating then
4804 Adjust_Instantiation_Sloc (New_N, S_Adjustment);
4807 if not Is_List_Member (N) then
4808 Set_Parent (New_N, Parent_Id);
4811 -- If defining identifier, then all fields have been copied already
4813 if Nkind (New_N) in N_Entity then
4816 -- Special casing for identifiers and other entity names and operators
4818 elsif Nkind (New_N) = N_Identifier
4819 or else Nkind (New_N) = N_Character_Literal
4820 or else Nkind (New_N) = N_Expanded_Name
4821 or else Nkind (New_N) = N_Operator_Symbol
4822 or else Nkind (New_N) in N_Op
4824 if not Instantiating then
4826 -- Link both nodes in order to assign subsequently the
4827 -- entity of the copy to the original node, in case this
4828 -- is a global reference.
4830 Set_Associated_Node (N, New_N);
4832 -- If we are within an instantiation, this is a nested generic
4833 -- that has already been analyzed at the point of definition. We
4834 -- must preserve references that were global to the enclosing
4835 -- parent at that point. Other occurrences, whether global or
4836 -- local to the current generic, must be resolved anew, so we
4837 -- reset the entity in the generic copy. A global reference has
4838 -- a smaller depth than the parent, or else the same depth in
4839 -- case both are distinct compilation units.
4841 -- It is also possible for Current_Instantiated_Parent to be
4842 -- defined, and for this not to be a nested generic, namely
4843 -- if the unit is loaded through Rtsfind. In that case, the
4844 -- entity of New_N is only a link to the associated node, and
4845 -- not a defining occurrence.
4847 -- The entities for parent units in the defining_program_unit
4848 -- of a generic child unit are established when the context of
4849 -- the unit is first analyzed, before the generic copy is made.
4850 -- They are preserved in the copy for use in ASIS queries.
4852 Ent := Entity (New_N);
4854 if No (Current_Instantiated_Parent.Gen_Id) then
4856 or else Nkind (Ent) /= N_Defining_Identifier
4857 or else not In_Defining_Unit_Name (N)
4859 Set_Associated_Node (New_N, Empty);
4864 not (Nkind (Ent) = N_Defining_Identifier
4866 Nkind (Ent) = N_Defining_Character_Literal
4868 Nkind (Ent) = N_Defining_Operator_Symbol)
4869 or else No (Scope (Ent))
4870 or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id
4871 or else (Scope_Depth (Scope (Ent)) >
4872 Scope_Depth (Current_Instantiated_Parent.Gen_Id)
4874 Get_Source_Unit (Ent) =
4875 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id))
4877 Set_Associated_Node (New_N, Empty);
4880 -- Case of instantiating identifier or some other name or operator
4883 -- If the associated node is still defined, the entity in
4884 -- it is global, and must be copied to the instance.
4885 -- If this copy is being made for a body to inline, it is
4886 -- applied to an instantiated tree, and the entity is already
4887 -- present and must be also preserved.
4890 Assoc : constant Node_Id := Get_Associated_Node (N);
4892 if Present (Assoc) then
4893 if Nkind (Assoc) = Nkind (N) then
4894 Set_Entity (New_N, Entity (Assoc));
4895 Check_Private_View (N);
4897 elsif Nkind (Assoc) = N_Function_Call then
4898 Set_Entity (New_N, Entity (Name (Assoc)));
4900 elsif (Nkind (Assoc) = N_Defining_Identifier
4901 or else Nkind (Assoc) = N_Defining_Character_Literal
4902 or else Nkind (Assoc) = N_Defining_Operator_Symbol)
4903 and then Expander_Active
4905 -- Inlining case: we are copying a tree that contains
4906 -- global entities, which are preserved in the copy
4907 -- to be used for subsequent inlining.
4912 Set_Entity (New_N, Empty);
4918 -- For expanded name, we must copy the Prefix and Selector_Name
4920 if Nkind (N) = N_Expanded_Name then
4922 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating));
4924 Set_Selector_Name (New_N,
4925 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating));
4927 -- For operators, we must copy the right operand
4929 elsif Nkind (N) in N_Op then
4930 Set_Right_Opnd (New_N,
4931 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating));
4933 -- And for binary operators, the left operand as well
4935 if Nkind (N) in N_Binary_Op then
4936 Set_Left_Opnd (New_N,
4937 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating));
4941 -- Special casing for stubs
4943 elsif Nkind (N) in N_Body_Stub then
4945 -- In any case, we must copy the specification or defining
4946 -- identifier as appropriate.
4948 if Nkind (N) = N_Subprogram_Body_Stub then
4949 Set_Specification (New_N,
4950 Copy_Generic_Node (Specification (N), New_N, Instantiating));
4953 Set_Defining_Identifier (New_N,
4955 (Defining_Identifier (N), New_N, Instantiating));
4958 -- If we are not instantiating, then this is where we load and
4959 -- analyze subunits, i.e. at the point where the stub occurs. A
4960 -- more permissivle system might defer this analysis to the point
4961 -- of instantiation, but this seems to complicated for now.
4963 if not Instantiating then
4965 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N);
4967 Unum : Unit_Number_Type;
4973 (Load_Name => Subunit_Name,
4978 -- If the proper body is not found, a warning message will
4979 -- be emitted when analyzing the stub, or later at the the
4980 -- point of instantiation. Here we just leave the stub as is.
4982 if Unum = No_Unit then
4983 Subunits_Missing := True;
4984 goto Subunit_Not_Found;
4987 Subunit := Cunit (Unum);
4989 if Nkind (Unit (Subunit)) /= N_Subunit then
4990 Error_Msg_Sloc := Sloc (N);
4992 ("expected SEPARATE subunit to complete stub at#,"
4993 & " found child unit", Subunit);
4994 goto Subunit_Not_Found;
4997 -- We must create a generic copy of the subunit, in order
4998 -- to perform semantic analysis on it, and we must replace
4999 -- the stub in the original generic unit with the subunit,
5000 -- in order to preserve non-local references within.
5002 -- Only the proper body needs to be copied. Library_Unit and
5003 -- context clause are simply inherited by the generic copy.
5004 -- Note that the copy (which may be recursive if there are
5005 -- nested subunits) must be done first, before attaching it
5006 -- to the enclosing generic.
5010 (Proper_Body (Unit (Subunit)),
5011 Empty, Instantiating => False);
5013 -- Now place the original proper body in the original
5014 -- generic unit. This is a body, not a compilation unit.
5016 Rewrite (N, Proper_Body (Unit (Subunit)));
5017 Set_Is_Compilation_Unit (Defining_Entity (N), False);
5018 Set_Was_Originally_Stub (N);
5020 -- Finally replace the body of the subunit with its copy,
5021 -- and make this new subunit into the library unit of the
5022 -- generic copy, which does not have stubs any longer.
5024 Set_Proper_Body (Unit (Subunit), New_Body);
5025 Set_Library_Unit (New_N, Subunit);
5026 Inherit_Context (Unit (Subunit), N);
5029 -- If we are instantiating, this must be an error case, since
5030 -- otherwise we would have replaced the stub node by the proper
5031 -- body that corresponds. So just ignore it in the copy (i.e.
5032 -- we have copied it, and that is good enough).
5038 <<Subunit_Not_Found>> null;
5040 -- If the node is a compilation unit, it is the subunit of a stub,
5041 -- which has been loaded already (see code below). In this case,
5042 -- the library unit field of N points to the parent unit (which
5043 -- is a compilation unit) and need not (and cannot!) be copied.
5045 -- When the proper body of the stub is analyzed, thie library_unit
5046 -- link is used to establish the proper context (see sem_ch10).
5048 -- The other fields of a compilation unit are copied as usual
5050 elsif Nkind (N) = N_Compilation_Unit then
5052 -- This code can only be executed when not instantiating, because
5053 -- in the copy made for an instantiation, the compilation unit
5054 -- node has disappeared at the point that a stub is replaced by
5057 pragma Assert (not Instantiating);
5059 Set_Context_Items (New_N,
5060 Copy_Generic_List (Context_Items (N), New_N));
5063 Copy_Generic_Node (Unit (N), New_N, False));
5065 Set_First_Inlined_Subprogram (New_N,
5067 (First_Inlined_Subprogram (N), New_N, False));
5069 Set_Aux_Decls_Node (New_N,
5070 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False));
5072 -- For an assignment node, the assignment is known to be semantically
5073 -- legal if we are instantiating the template. This avoids incorrect
5074 -- diagnostics in generated code.
5076 elsif Nkind (N) = N_Assignment_Statement then
5078 -- Copy name and expression fields in usual manner
5081 Copy_Generic_Node (Name (N), New_N, Instantiating));
5083 Set_Expression (New_N,
5084 Copy_Generic_Node (Expression (N), New_N, Instantiating));
5086 if Instantiating then
5087 Set_Assignment_OK (Name (New_N), True);
5090 elsif Nkind (N) = N_Aggregate
5091 or else Nkind (N) = N_Extension_Aggregate
5094 if not Instantiating then
5095 Set_Associated_Node (N, New_N);
5098 if Present (Get_Associated_Node (N))
5099 and then Nkind (Get_Associated_Node (N)) = Nkind (N)
5101 -- In the generic the aggregate has some composite type. If at
5102 -- the point of instantiation the type has a private view,
5103 -- install the full view (and that of its ancestors, if any).
5106 T : Entity_Id := (Etype (Get_Associated_Node (New_N)));
5111 and then Is_Private_Type (T)
5117 and then Is_Tagged_Type (T)
5118 and then Is_Derived_Type (T)
5120 Rt := Root_Type (T);
5125 if Is_Private_Type (T) then
5136 -- Do not copy the associated node, which points to
5137 -- the generic copy of the aggregate.
5140 use Atree.Unchecked_Access;
5141 -- This code section is part of the implementation of an untyped
5142 -- tree traversal, so it needs direct access to node fields.
5145 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N)));
5146 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N)));
5147 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N)));
5148 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N)));
5151 -- Allocators do not have an identifier denoting the access type,
5152 -- so we must locate it through the expression to check whether
5153 -- the views are consistent.
5155 elsif Nkind (N) = N_Allocator
5156 and then Nkind (Expression (N)) = N_Qualified_Expression
5157 and then Is_Entity_Name (Subtype_Mark (Expression (N)))
5158 and then Instantiating
5161 T : constant Node_Id :=
5162 Get_Associated_Node (Subtype_Mark (Expression (N)));
5167 -- Retrieve the allocator node in the generic copy.
5169 Acc_T := Etype (Parent (Parent (T)));
5171 and then Is_Private_Type (Acc_T)
5173 Switch_View (Acc_T);
5180 -- For a proper body, we must catch the case of a proper body that
5181 -- replaces a stub. This represents the point at which a separate
5182 -- compilation unit, and hence template file, may be referenced, so
5183 -- we must make a new source instantiation entry for the template
5184 -- of the subunit, and ensure that all nodes in the subunit are
5185 -- adjusted using this new source instantiation entry.
5187 elsif Nkind (N) in N_Proper_Body then
5189 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment;
5192 if Instantiating and then Was_Originally_Stub (N) then
5193 Create_Instantiation_Source
5194 (Instantiation_Node,
5195 Defining_Entity (N),
5200 -- Now copy the fields of the proper body, using the new
5201 -- adjustment factor if one was needed as per test above.
5205 -- Restore the original adjustment factor in case changed
5207 S_Adjustment := Save_Adjustment;
5210 -- Don't copy Ident or Comment pragmas, since the comment belongs
5211 -- to the generic unit, not to the instantiating unit.
5213 elsif Nkind (N) = N_Pragma
5214 and then Instantiating
5217 Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N));
5220 if Prag_Id = Pragma_Ident
5221 or else Prag_Id = Pragma_Comment
5223 New_N := Make_Null_Statement (Sloc (N));
5230 elsif Nkind (N) = N_Integer_Literal
5231 or else Nkind (N) = N_Real_Literal
5233 -- No descendant fields need traversing
5237 -- For the remaining nodes, copy recursively their descendants
5243 and then Nkind (N) = N_Subprogram_Body
5245 Set_Generic_Parent (Specification (New_N), N);
5250 end Copy_Generic_Node;
5252 ----------------------------
5253 -- Denotes_Formal_Package --
5254 ----------------------------
5256 function Denotes_Formal_Package
5258 On_Exit : Boolean := False) return Boolean
5261 Scop : constant Entity_Id := Scope (Pack);
5268 (Instance_Envs.Last).Instantiated_Parent.Act_Id;
5270 Par := Current_Instantiated_Parent.Act_Id;
5273 if Ekind (Scop) = E_Generic_Package
5274 or else Nkind (Unit_Declaration_Node (Scop)) =
5275 N_Generic_Subprogram_Declaration
5279 elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then
5286 -- Check whether this package is associated with a formal
5287 -- package of the enclosing instantiation. Iterate over the
5288 -- list of renamings.
5290 E := First_Entity (Par);
5291 while Present (E) loop
5292 if Ekind (E) /= E_Package
5293 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration
5296 elsif Renamed_Object (E) = Par then
5299 elsif Renamed_Object (E) = Pack then
5308 end Denotes_Formal_Package;
5314 procedure End_Generic is
5316 -- ??? More things could be factored out in this
5317 -- routine. Should probably be done at a later stage.
5319 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last);
5320 Generic_Flags.Decrement_Last;
5322 Expander_Mode_Restore;
5325 ----------------------
5326 -- Find_Actual_Type --
5327 ----------------------
5329 function Find_Actual_Type
5331 Gen_Scope : Entity_Id) return Entity_Id
5336 if not Is_Child_Unit (Gen_Scope) then
5337 return Get_Instance_Of (Typ);
5339 elsif not Is_Generic_Type (Typ)
5340 or else Scope (Typ) = Gen_Scope
5342 return Get_Instance_Of (Typ);
5345 T := Current_Entity (Typ);
5346 while Present (T) loop
5347 if In_Open_Scopes (Scope (T)) then
5356 end Find_Actual_Type;
5358 ----------------------------
5359 -- Freeze_Subprogram_Body --
5360 ----------------------------
5362 procedure Freeze_Subprogram_Body
5363 (Inst_Node : Node_Id;
5365 Pack_Id : Entity_Id)
5368 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
5369 Par : constant Entity_Id := Scope (Gen_Unit);
5374 function Earlier (N1, N2 : Node_Id) return Boolean;
5375 -- Yields True if N1 and N2 appear in the same compilation unit,
5376 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right
5377 -- traversal of the tree for the unit.
5379 function Enclosing_Body (N : Node_Id) return Node_Id;
5380 -- Find innermost package body that encloses the given node, and which
5381 -- is not a compilation unit. Freeze nodes for the instance, or for its
5382 -- enclosing body, may be inserted after the enclosing_body of the
5385 function Package_Freeze_Node (B : Node_Id) return Node_Id;
5386 -- Find entity for given package body, and locate or create a freeze
5389 function True_Parent (N : Node_Id) return Node_Id;
5390 -- For a subunit, return parent of corresponding stub.
5396 function Earlier (N1, N2 : Node_Id) return Boolean is
5402 procedure Find_Depth (P : in out Node_Id; D : in out Integer);
5403 -- Find distance from given node to enclosing compilation unit.
5409 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is
5412 and then Nkind (P) /= N_Compilation_Unit
5414 P := True_Parent (P);
5419 -- Start of procesing for Earlier
5422 Find_Depth (P1, D1);
5423 Find_Depth (P2, D2);
5433 P1 := True_Parent (P1);
5438 P2 := True_Parent (P2);
5442 -- At this point P1 and P2 are at the same distance from the root.
5443 -- We examine their parents until we find a common declarative
5444 -- list, at which point we can establish their relative placement
5445 -- by comparing their ultimate slocs. If we reach the root,
5446 -- N1 and N2 do not descend from the same declarative list (e.g.
5447 -- one is nested in the declarative part and the other is in a block
5448 -- in the statement part) and the earlier one is already frozen.
5450 while not Is_List_Member (P1)
5451 or else not Is_List_Member (P2)
5452 or else List_Containing (P1) /= List_Containing (P2)
5454 P1 := True_Parent (P1);
5455 P2 := True_Parent (P2);
5457 if Nkind (Parent (P1)) = N_Subunit then
5458 P1 := Corresponding_Stub (Parent (P1));
5461 if Nkind (Parent (P2)) = N_Subunit then
5462 P2 := Corresponding_Stub (Parent (P2));
5471 Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2));
5474 --------------------
5475 -- Enclosing_Body --
5476 --------------------
5478 function Enclosing_Body (N : Node_Id) return Node_Id is
5479 P : Node_Id := Parent (N);
5483 and then Nkind (Parent (P)) /= N_Compilation_Unit
5485 if Nkind (P) = N_Package_Body then
5487 if Nkind (Parent (P)) = N_Subunit then
5488 return Corresponding_Stub (Parent (P));
5494 P := True_Parent (P);
5500 -------------------------
5501 -- Package_Freeze_Node --
5502 -------------------------
5504 function Package_Freeze_Node (B : Node_Id) return Node_Id is
5508 if Nkind (B) = N_Package_Body then
5509 Id := Corresponding_Spec (B);
5511 else pragma Assert (Nkind (B) = N_Package_Body_Stub);
5512 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B))));
5515 Ensure_Freeze_Node (Id);
5516 return Freeze_Node (Id);
5517 end Package_Freeze_Node;
5523 function True_Parent (N : Node_Id) return Node_Id is
5525 if Nkind (Parent (N)) = N_Subunit then
5526 return Parent (Corresponding_Stub (Parent (N)));
5532 -- Start of processing of Freeze_Subprogram_Body
5535 -- If the instance and the generic body appear within the same
5536 -- unit, and the instance preceeds the generic, the freeze node for
5537 -- the instance must appear after that of the generic. If the generic
5538 -- is nested within another instance I2, then current instance must
5539 -- be frozen after I2. In both cases, the freeze nodes are those of
5540 -- enclosing packages. Otherwise, the freeze node is placed at the end
5541 -- of the current declarative part.
5543 Enc_G := Enclosing_Body (Gen_Body);
5544 Enc_I := Enclosing_Body (Inst_Node);
5545 Ensure_Freeze_Node (Pack_Id);
5546 F_Node := Freeze_Node (Pack_Id);
5548 if Is_Generic_Instance (Par)
5549 and then Present (Freeze_Node (Par))
5551 In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node)
5553 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then
5555 -- The parent was a premature instantiation. Insert freeze
5556 -- node at the end the current declarative part.
5558 Insert_After_Last_Decl (Inst_Node, F_Node);
5561 Insert_After (Freeze_Node (Par), F_Node);
5564 -- The body enclosing the instance should be frozen after the body
5565 -- that includes the generic, because the body of the instance may
5566 -- make references to entities therein. If the two are not in the
5567 -- same declarative part, or if the one enclosing the instance is
5568 -- frozen already, freeze the instance at the end of the current
5569 -- declarative part.
5571 elsif Is_Generic_Instance (Par)
5572 and then Present (Freeze_Node (Par))
5573 and then Present (Enc_I)
5575 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I)
5577 (Nkind (Enc_I) = N_Package_Body
5579 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I)))
5581 -- The enclosing package may contain several instances. Rather
5582 -- than computing the earliest point at which to insert its
5583 -- freeze node, we place it at the end of the declarative part
5584 -- of the parent of the generic.
5586 Insert_After_Last_Decl
5587 (Freeze_Node (Par), Package_Freeze_Node (Enc_I));
5590 Insert_After_Last_Decl (Inst_Node, F_Node);
5592 elsif Present (Enc_G)
5593 and then Present (Enc_I)
5594 and then Enc_G /= Enc_I
5595 and then Earlier (Inst_Node, Gen_Body)
5597 if Nkind (Enc_G) = N_Package_Body then
5598 E_G_Id := Corresponding_Spec (Enc_G);
5599 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub);
5601 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G))));
5604 -- Freeze package that encloses instance, and place node after
5605 -- package that encloses generic. If enclosing package is already
5606 -- frozen we have to assume it is at the proper place. This may
5607 -- be a potential ABE that requires dynamic checking.
5609 Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I));
5611 -- Freeze enclosing subunit before instance
5613 Ensure_Freeze_Node (E_G_Id);
5615 if not Is_List_Member (Freeze_Node (E_G_Id)) then
5616 Insert_After (Enc_G, Freeze_Node (E_G_Id));
5619 Insert_After_Last_Decl (Inst_Node, F_Node);
5622 -- If none of the above, insert freeze node at the end of the
5623 -- current declarative part.
5625 Insert_After_Last_Decl (Inst_Node, F_Node);
5627 end Freeze_Subprogram_Body;
5633 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is
5635 return Generic_Renamings.Table (E).Gen_Id;
5638 ---------------------
5639 -- Get_Instance_Of --
5640 ---------------------
5642 function Get_Instance_Of (A : Entity_Id) return Entity_Id is
5643 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A);
5646 if Res /= Assoc_Null then
5647 return Generic_Renamings.Table (Res).Act_Id;
5649 -- On exit, entity is not instantiated: not a generic parameter,
5650 -- or else parameter of an inner generic unit.
5654 end Get_Instance_Of;
5656 ------------------------------------
5657 -- Get_Package_Instantiation_Node --
5658 ------------------------------------
5660 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is
5661 Decl : Node_Id := Unit_Declaration_Node (A);
5665 -- If the instantiation is a compilation unit that does not need a
5666 -- body then the instantiation node has been rewritten as a package
5667 -- declaration for the instance, and we return the original node.
5669 -- If it is a compilation unit and the instance node has not been
5670 -- rewritten, then it is still the unit of the compilation. Finally,
5671 -- if a body is present, this is a parent of the main unit whose body
5672 -- has been compiled for inlining purposes, and the instantiation node
5673 -- has been rewritten with the instance body.
5675 -- Otherwise the instantiation node appears after the declaration.
5676 -- If the entity is a formal package, the declaration may have been
5677 -- rewritten as a generic declaration (in the case of a formal with a
5678 -- box) or left as a formal package declaration if it has actuals, and
5679 -- is found with a forward search.
5681 if Nkind (Parent (Decl)) = N_Compilation_Unit then
5682 if Nkind (Decl) = N_Package_Declaration
5683 and then Present (Corresponding_Body (Decl))
5685 Decl := Unit_Declaration_Node (Corresponding_Body (Decl));
5688 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then
5689 return Original_Node (Decl);
5691 return Unit (Parent (Decl));
5694 elsif Nkind (Decl) = N_Generic_Package_Declaration
5695 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration
5697 return Original_Node (Decl);
5700 Inst := Next (Decl);
5701 while Nkind (Inst) /= N_Package_Instantiation
5702 and then Nkind (Inst) /= N_Formal_Package_Declaration
5709 end Get_Package_Instantiation_Node;
5711 ------------------------
5712 -- Has_Been_Exchanged --
5713 ------------------------
5715 function Has_Been_Exchanged (E : Entity_Id) return Boolean is
5716 Next : Elmt_Id := First_Elmt (Exchanged_Views);
5719 while Present (Next) loop
5720 if Full_View (Node (Next)) = E then
5728 end Has_Been_Exchanged;
5734 function Hash (F : Entity_Id) return HTable_Range is
5736 return HTable_Range (F mod HTable_Size);
5739 ------------------------
5740 -- Hide_Current_Scope --
5741 ------------------------
5743 procedure Hide_Current_Scope is
5744 C : constant Entity_Id := Current_Scope;
5748 Set_Is_Hidden_Open_Scope (C);
5749 E := First_Entity (C);
5751 while Present (E) loop
5752 if Is_Immediately_Visible (E) then
5753 Set_Is_Immediately_Visible (E, False);
5754 Append_Elmt (E, Hidden_Entities);
5760 -- Make the scope name invisible as well. This is necessary, but
5761 -- might conflict with calls to Rtsfind later on, in case the scope
5762 -- is a predefined one. There is no clean solution to this problem, so
5763 -- for now we depend on the user not redefining Standard itself in one
5764 -- of the parent units.
5766 if Is_Immediately_Visible (C)
5767 and then C /= Standard_Standard
5769 Set_Is_Immediately_Visible (C, False);
5770 Append_Elmt (C, Hidden_Entities);
5773 end Hide_Current_Scope;
5779 procedure Init_Env is
5780 Saved : Instance_Env;
5783 Saved.Ada_Version := Ada_Version;
5784 Saved.Instantiated_Parent := Current_Instantiated_Parent;
5785 Saved.Exchanged_Views := Exchanged_Views;
5786 Saved.Hidden_Entities := Hidden_Entities;
5787 Saved.Current_Sem_Unit := Current_Sem_Unit;
5788 Instance_Envs.Increment_Last;
5789 Instance_Envs.Table (Instance_Envs.Last) := Saved;
5791 Exchanged_Views := New_Elmt_List;
5792 Hidden_Entities := New_Elmt_List;
5794 -- Make dummy entry for Instantiated parent. If generic unit is
5795 -- legal, this is set properly in Set_Instance_Env.
5797 Current_Instantiated_Parent :=
5798 (Current_Scope, Current_Scope, Assoc_Null);
5801 ------------------------------
5802 -- In_Same_Declarative_Part --
5803 ------------------------------
5805 function In_Same_Declarative_Part
5807 Inst : Node_Id) return Boolean
5809 Decls : constant Node_Id := Parent (F_Node);
5810 Nod : Node_Id := Parent (Inst);
5813 while Present (Nod) loop
5817 elsif Nkind (Nod) = N_Subprogram_Body
5818 or else Nkind (Nod) = N_Package_Body
5819 or else Nkind (Nod) = N_Task_Body
5820 or else Nkind (Nod) = N_Protected_Body
5821 or else Nkind (Nod) = N_Block_Statement
5825 elsif Nkind (Nod) = N_Subunit then
5826 Nod := Corresponding_Stub (Nod);
5828 elsif Nkind (Nod) = N_Compilation_Unit then
5831 Nod := Parent (Nod);
5836 end In_Same_Declarative_Part;
5838 ---------------------
5839 -- In_Main_Context --
5840 ---------------------
5842 function In_Main_Context (E : Entity_Id) return Boolean is
5848 if not Is_Compilation_Unit (E)
5849 or else Ekind (E) /= E_Package
5850 or else In_Private_Part (E)
5855 Context := Context_Items (Cunit (Main_Unit));
5857 Clause := First (Context);
5858 while Present (Clause) loop
5859 if Nkind (Clause) = N_With_Clause then
5860 Nam := Name (Clause);
5862 -- If the current scope is part of the context of the main unit,
5863 -- analysis of the corresponding with_clause is not complete, and
5864 -- the entity is not set. We use the Chars field directly, which
5865 -- might produce false positives in rare cases, but guarantees
5866 -- that we produce all the instance bodies we will need.
5868 if (Nkind (Nam) = N_Identifier
5869 and then Chars (Nam) = Chars (E))
5870 or else (Nkind (Nam) = N_Selected_Component
5871 and then Chars (Selector_Name (Nam)) = Chars (E))
5881 end In_Main_Context;
5883 ---------------------
5884 -- Inherit_Context --
5885 ---------------------
5887 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is
5888 Current_Context : List_Id;
5889 Current_Unit : Node_Id;
5894 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then
5896 -- The inherited context is attached to the enclosing compilation
5897 -- unit. This is either the main unit, or the declaration for the
5898 -- main unit (in case the instantation appears within the package
5899 -- declaration and the main unit is its body).
5901 Current_Unit := Parent (Inst);
5902 while Present (Current_Unit)
5903 and then Nkind (Current_Unit) /= N_Compilation_Unit
5905 Current_Unit := Parent (Current_Unit);
5908 Current_Context := Context_Items (Current_Unit);
5910 Item := First (Context_Items (Parent (Gen_Decl)));
5911 while Present (Item) loop
5912 if Nkind (Item) = N_With_Clause then
5913 New_I := New_Copy (Item);
5914 Set_Implicit_With (New_I, True);
5915 Append (New_I, Current_Context);
5921 end Inherit_Context;
5927 procedure Initialize is
5929 Generic_Renamings.Init;
5932 Generic_Renamings_HTable.Reset;
5933 Circularity_Detected := False;
5934 Exchanged_Views := No_Elist;
5935 Hidden_Entities := No_Elist;
5938 ----------------------------
5939 -- Insert_After_Last_Decl --
5940 ----------------------------
5942 procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is
5943 L : List_Id := List_Containing (N);
5944 P : constant Node_Id := Parent (L);
5947 if not Is_List_Member (F_Node) then
5948 if Nkind (P) = N_Package_Specification
5949 and then L = Visible_Declarations (P)
5950 and then Present (Private_Declarations (P))
5951 and then not Is_Empty_List (Private_Declarations (P))
5953 L := Private_Declarations (P);
5956 Insert_After (Last (L), F_Node);
5958 end Insert_After_Last_Decl;
5964 procedure Install_Body
5965 (Act_Body : Node_Id;
5970 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body);
5971 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N)));
5972 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body);
5973 Par : constant Entity_Id := Scope (Gen_Id);
5974 Gen_Unit : constant Node_Id :=
5975 Unit (Cunit (Get_Source_Unit (Gen_Decl)));
5976 Orig_Body : Node_Id := Gen_Body;
5978 Body_Unit : Node_Id;
5980 Must_Delay : Boolean;
5982 function Enclosing_Subp (Id : Entity_Id) return Entity_Id;
5983 -- Find subprogram (if any) that encloses instance and/or generic body.
5985 function True_Sloc (N : Node_Id) return Source_Ptr;
5986 -- If the instance is nested inside a generic unit, the Sloc of the
5987 -- instance indicates the place of the original definition, not the
5988 -- point of the current enclosing instance. Pending a better usage of
5989 -- Slocs to indicate instantiation places, we determine the place of
5990 -- origin of a node by finding the maximum sloc of any ancestor node.
5991 -- Why is this not equivalent fo Top_Level_Location ???
5993 --------------------
5994 -- Enclosing_Subp --
5995 --------------------
5997 function Enclosing_Subp (Id : Entity_Id) return Entity_Id is
5998 Scop : Entity_Id := Scope (Id);
6001 while Scop /= Standard_Standard
6002 and then not Is_Overloadable (Scop)
6004 Scop := Scope (Scop);
6014 function True_Sloc (N : Node_Id) return Source_Ptr is
6021 while Present (N1) and then N1 /= Act_Unit loop
6022 if Sloc (N1) > Res then
6032 -- Start of processing for Install_Body
6035 -- If the body is a subunit, the freeze point is the corresponding
6036 -- stub in the current compilation, not the subunit itself.
6038 if Nkind (Parent (Gen_Body)) = N_Subunit then
6039 Orig_Body := Corresponding_Stub (Parent (Gen_Body));
6041 Orig_Body := Gen_Body;
6044 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body)));
6046 -- If the instantiation and the generic definition appear in the
6047 -- same package declaration, this is an early instantiation.
6048 -- If they appear in the same declarative part, it is an early
6049 -- instantiation only if the generic body appears textually later,
6050 -- and the generic body is also in the main unit.
6052 -- If instance is nested within a subprogram, and the generic body is
6053 -- not, the instance is delayed because the enclosing body is. If
6054 -- instance and body are within the same scope, or the same sub-
6055 -- program body, indicate explicitly that the instance is delayed.
6058 (Gen_Unit = Act_Unit
6059 and then ((Nkind (Gen_Unit) = N_Package_Declaration)
6060 or else Nkind (Gen_Unit) = N_Generic_Package_Declaration
6061 or else (Gen_Unit = Body_Unit
6062 and then True_Sloc (N) < Sloc (Orig_Body)))
6063 and then Is_In_Main_Unit (Gen_Unit)
6064 and then (Scope (Act_Id) = Scope (Gen_Id)
6066 Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id)));
6068 -- If this is an early instantiation, the freeze node is placed after
6069 -- the generic body. Otherwise, if the generic appears in an instance,
6070 -- we cannot freeze the current instance until the outer one is frozen.
6071 -- This is only relevant if the current instance is nested within some
6072 -- inner scope not itself within the outer instance. If this scope is
6073 -- a package body in the same declarative part as the outer instance,
6074 -- then that body needs to be frozen after the outer instance. Finally,
6075 -- if no delay is needed, we place the freeze node at the end of the
6076 -- current declarative part.
6078 if Expander_Active then
6079 Ensure_Freeze_Node (Act_Id);
6080 F_Node := Freeze_Node (Act_Id);
6083 Insert_After (Orig_Body, F_Node);
6085 elsif Is_Generic_Instance (Par)
6086 and then Present (Freeze_Node (Par))
6087 and then Scope (Act_Id) /= Par
6089 -- Freeze instance of inner generic after instance of enclosing
6092 if In_Same_Declarative_Part (Freeze_Node (Par), N) then
6093 Insert_After (Freeze_Node (Par), F_Node);
6095 -- Freeze package enclosing instance of inner generic after
6096 -- instance of enclosing generic.
6098 elsif Nkind (Parent (N)) = N_Package_Body
6099 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N))
6103 Enclosing : constant Entity_Id :=
6104 Corresponding_Spec (Parent (N));
6107 Insert_After_Last_Decl (N, F_Node);
6108 Ensure_Freeze_Node (Enclosing);
6110 if not Is_List_Member (Freeze_Node (Enclosing)) then
6111 Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing));
6116 Insert_After_Last_Decl (N, F_Node);
6120 Insert_After_Last_Decl (N, F_Node);
6124 Set_Is_Frozen (Act_Id);
6125 Insert_Before (N, Act_Body);
6126 Mark_Rewrite_Insertion (Act_Body);
6129 --------------------
6130 -- Install_Parent --
6131 --------------------
6133 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is
6134 Ancestors : constant Elist_Id := New_Elmt_List;
6135 S : constant Entity_Id := Current_Scope;
6136 Inst_Par : Entity_Id;
6137 First_Par : Entity_Id;
6138 Inst_Node : Node_Id;
6139 Gen_Par : Entity_Id;
6140 First_Gen : Entity_Id;
6143 procedure Install_Formal_Packages (Par : Entity_Id);
6144 -- If any of the formals of the parent are formal packages with box,
6145 -- their formal parts are visible in the parent and thus in the child
6146 -- unit as well. Analogous to what is done in Check_Generic_Actuals
6147 -- for the unit itself.
6149 procedure Install_Noninstance_Specs (Par : Entity_Id);
6150 -- Install the scopes of noninstance parent units ending with Par.
6152 procedure Install_Spec (Par : Entity_Id);
6153 -- The child unit is within the declarative part of the parent, so
6154 -- the declarations within the parent are immediately visible.
6156 -----------------------------
6157 -- Install_Formal_Packages --
6158 -----------------------------
6160 procedure Install_Formal_Packages (Par : Entity_Id) is
6164 E := First_Entity (Par);
6166 while Present (E) loop
6168 if Ekind (E) = E_Package
6169 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration
6171 -- If this is the renaming for the parent instance, done.
6173 if Renamed_Object (E) = Par then
6176 -- The visibility of a formal of an enclosing generic is
6179 elsif Denotes_Formal_Package (E) then
6182 elsif Present (Associated_Formal_Package (E))
6183 and then Box_Present (Parent (Associated_Formal_Package (E)))
6185 Check_Generic_Actuals (Renamed_Object (E), True);
6186 Set_Is_Hidden (E, False);
6192 end Install_Formal_Packages;
6194 -------------------------------
6195 -- Install_Noninstance_Specs --
6196 -------------------------------
6198 procedure Install_Noninstance_Specs (Par : Entity_Id) is
6201 and then Par /= Standard_Standard
6202 and then not In_Open_Scopes (Par)
6204 Install_Noninstance_Specs (Scope (Par));
6207 end Install_Noninstance_Specs;
6213 procedure Install_Spec (Par : Entity_Id) is
6214 Spec : constant Node_Id :=
6215 Specification (Unit_Declaration_Node (Par));
6219 Set_Is_Immediately_Visible (Par);
6220 Install_Visible_Declarations (Par);
6221 Install_Private_Declarations (Par);
6222 Set_Use (Visible_Declarations (Spec));
6223 Set_Use (Private_Declarations (Spec));
6226 -- Start of processing for Install_Parent
6229 -- We need to install the parent instance to compile the instantiation
6230 -- of the child, but the child instance must appear in the current
6231 -- scope. Given that we cannot place the parent above the current
6232 -- scope in the scope stack, we duplicate the current scope and unstack
6233 -- both after the instantiation is complete.
6235 -- If the parent is itself the instantiation of a child unit, we must
6236 -- also stack the instantiation of its parent, and so on. Each such
6237 -- ancestor is the prefix of the name in a prior instantiation.
6239 -- If this is a nested instance, the parent unit itself resolves to
6240 -- a renaming of the parent instance, whose declaration we need.
6242 -- Finally, the parent may be a generic (not an instance) when the
6243 -- child unit appears as a formal package.
6247 if Present (Renamed_Entity (Inst_Par)) then
6248 Inst_Par := Renamed_Entity (Inst_Par);
6251 First_Par := Inst_Par;
6254 Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par)));
6256 First_Gen := Gen_Par;
6258 while Present (Gen_Par)
6259 and then Is_Child_Unit (Gen_Par)
6261 -- Load grandparent instance as well
6263 Inst_Node := Get_Package_Instantiation_Node (Inst_Par);
6265 if Nkind (Name (Inst_Node)) = N_Expanded_Name then
6266 Inst_Par := Entity (Prefix (Name (Inst_Node)));
6268 if Present (Renamed_Entity (Inst_Par)) then
6269 Inst_Par := Renamed_Entity (Inst_Par);
6274 (Specification (Unit_Declaration_Node (Inst_Par)));
6276 if Present (Gen_Par) then
6277 Prepend_Elmt (Inst_Par, Ancestors);
6280 -- Parent is not the name of an instantiation
6282 Install_Noninstance_Specs (Inst_Par);
6294 if Present (First_Gen) then
6295 Append_Elmt (First_Par, Ancestors);
6298 Install_Noninstance_Specs (First_Par);
6301 if not Is_Empty_Elmt_List (Ancestors) then
6302 Elmt := First_Elmt (Ancestors);
6304 while Present (Elmt) loop
6305 Install_Spec (Node (Elmt));
6306 Install_Formal_Packages (Node (Elmt));
6317 --------------------------------
6318 -- Instantiate_Formal_Package --
6319 --------------------------------
6321 function Instantiate_Formal_Package
6324 Analyzed_Formal : Node_Id) return List_Id
6326 Loc : constant Source_Ptr := Sloc (Actual);
6327 Actual_Pack : Entity_Id;
6328 Formal_Pack : Entity_Id;
6329 Gen_Parent : Entity_Id;
6332 Parent_Spec : Node_Id;
6334 procedure Find_Matching_Actual
6336 Act : in out Entity_Id);
6337 -- We need to associate each formal entity in the formal package
6338 -- with the corresponding entity in the actual package. The actual
6339 -- package has been analyzed and possibly expanded, and as a result
6340 -- there is no one-to-one correspondence between the two lists (for
6341 -- example, the actual may include subtypes, itypes, and inherited
6342 -- primitive operations, interspersed among the renaming declarations
6343 -- for the actuals) . We retrieve the corresponding actual by name
6344 -- because each actual has the same name as the formal, and they do
6345 -- appear in the same order.
6347 function Formal_Entity
6349 Act_Ent : Entity_Id) return Entity_Id;
6350 -- Returns the entity associated with the given formal F. In the
6351 -- case where F is a formal package, this function will iterate
6352 -- through all of F's formals and enter map associations from the
6353 -- actuals occurring in the formal package's corresponding actual
6354 -- package (obtained via Act_Ent) to the formal package's formal
6355 -- parameters. This function is called recursively for arbitrary
6356 -- levels of formal packages.
6358 function Is_Instance_Of
6359 (Act_Spec : Entity_Id;
6360 Gen_Anc : Entity_Id) return Boolean;
6361 -- The actual can be an instantiation of a generic within another
6362 -- instance, in which case there is no direct link from it to the
6363 -- original generic ancestor. In that case, we recognize that the
6364 -- ultimate ancestor is the same by examining names and scopes.
6366 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id);
6367 -- Within the generic part, entities in the formal package are
6368 -- visible. To validate subsequent type declarations, indicate
6369 -- the correspondence betwen the entities in the analyzed formal,
6370 -- and the entities in the actual package. There are three packages
6371 -- involved in the instantiation of a formal package: the parent
6372 -- generic P1 which appears in the generic declaration, the fake
6373 -- instantiation P2 which appears in the analyzed generic, and whose
6374 -- visible entities may be used in subsequent formals, and the actual
6375 -- P3 in the instance. To validate subsequent formals, me indicate
6376 -- that the entities in P2 are mapped into those of P3. The mapping of
6377 -- entities has to be done recursively for nested packages.
6379 procedure Process_Nested_Formal (Formal : Entity_Id);
6380 -- If the current formal is declared with a box, its own formals are
6381 -- visible in the instance, as they were in the generic, and their
6382 -- Hidden flag must be reset. If some of these formals are themselves
6383 -- packages declared with a box, the processing must be recursive.
6385 --------------------------
6386 -- Find_Matching_Actual --
6387 --------------------------
6389 procedure Find_Matching_Actual
6391 Act : in out Entity_Id)
6393 Formal_Ent : Entity_Id;
6396 case Nkind (Original_Node (F)) is
6397 when N_Formal_Object_Declaration |
6398 N_Formal_Type_Declaration =>
6399 Formal_Ent := Defining_Identifier (F);
6401 while Chars (Act) /= Chars (Formal_Ent) loop
6405 when N_Formal_Subprogram_Declaration |
6406 N_Formal_Package_Declaration |
6407 N_Package_Declaration |
6408 N_Generic_Package_Declaration =>
6409 Formal_Ent := Defining_Entity (F);
6411 while Chars (Act) /= Chars (Formal_Ent) loop
6416 raise Program_Error;
6418 end Find_Matching_Actual;
6424 function Formal_Entity
6426 Act_Ent : Entity_Id) return Entity_Id
6428 Orig_Node : Node_Id := F;
6429 Act_Pkg : Entity_Id;
6432 case Nkind (Original_Node (F)) is
6433 when N_Formal_Object_Declaration =>
6434 return Defining_Identifier (F);
6436 when N_Formal_Type_Declaration =>
6437 return Defining_Identifier (F);
6439 when N_Formal_Subprogram_Declaration =>
6440 return Defining_Unit_Name (Specification (F));
6442 when N_Package_Declaration =>
6443 return Defining_Unit_Name (Specification (F));
6445 when N_Formal_Package_Declaration |
6446 N_Generic_Package_Declaration =>
6448 if Nkind (F) = N_Generic_Package_Declaration then
6449 Orig_Node := Original_Node (F);
6454 -- Find matching actual package, skipping over itypes and
6455 -- other entities generated when analyzing the formal. We
6456 -- know that if the instantiation is legal then there is
6457 -- a matching package for the formal.
6459 while Ekind (Act_Pkg) /= E_Package loop
6460 Act_Pkg := Next_Entity (Act_Pkg);
6464 Actual_Ent : Entity_Id := First_Entity (Act_Pkg);
6465 Formal_Node : Node_Id;
6466 Formal_Ent : Entity_Id;
6468 Gen_Decl : constant Node_Id :=
6469 Unit_Declaration_Node
6470 (Entity (Name (Orig_Node)));
6472 Formals : constant List_Id :=
6473 Generic_Formal_Declarations (Gen_Decl);
6476 if Present (Formals) then
6477 Formal_Node := First_Non_Pragma (Formals);
6479 Formal_Node := Empty;
6482 while Present (Actual_Ent)
6483 and then Present (Formal_Node)
6484 and then Actual_Ent /= First_Private_Entity (Act_Ent)
6486 -- ??? Are the following calls also needed here:
6488 -- Set_Is_Hidden (Actual_Ent, False);
6489 -- Set_Is_Potentially_Use_Visible
6490 -- (Actual_Ent, In_Use (Act_Ent));
6492 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6493 if Present (Formal_Ent) then
6494 Set_Instance_Of (Formal_Ent, Actual_Ent);
6496 Next_Non_Pragma (Formal_Node);
6498 Next_Entity (Actual_Ent);
6502 return Defining_Identifier (Orig_Node);
6504 when N_Use_Package_Clause =>
6507 when N_Use_Type_Clause =>
6510 -- We return Empty for all other encountered forms of
6511 -- declarations because there are some cases of nonformal
6512 -- sorts of declaration that can show up (e.g., when array
6513 -- formals are present). Since it's not clear what kinds
6514 -- can appear among the formals, we won't raise failure here.
6522 --------------------
6523 -- Is_Instance_Of --
6524 --------------------
6526 function Is_Instance_Of
6527 (Act_Spec : Entity_Id;
6528 Gen_Anc : Entity_Id) return Boolean
6530 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec);
6533 if No (Gen_Par) then
6536 -- Simplest case: the generic parent of the actual is the formal.
6538 elsif Gen_Par = Gen_Anc then
6541 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then
6544 -- The actual may be obtained through several instantiations. Its
6545 -- scope must itself be an instance of a generic declared in the
6546 -- same scope as the formal. Any other case is detected above.
6548 elsif not Is_Generic_Instance (Scope (Gen_Par)) then
6552 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc);
6560 procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is
6565 Set_Instance_Of (Form, Act);
6567 -- Traverse formal and actual package to map the corresponding
6568 -- entities. We skip over internal entities that may be generated
6569 -- during semantic analysis, and find the matching entities by
6570 -- name, given that they must appear in the same order.
6572 E1 := First_Entity (Form);
6573 E2 := First_Entity (Act);
6575 and then E1 /= First_Private_Entity (Form)
6577 if not Is_Internal (E1)
6578 and then not Is_Class_Wide_Type (E1)
6579 and then Present (Parent (E1))
6582 and then Chars (E2) /= Chars (E1)
6590 Set_Instance_Of (E1, E2);
6593 and then Is_Tagged_Type (E2)
6596 (Class_Wide_Type (E1), Class_Wide_Type (E2));
6599 if Ekind (E1) = E_Package
6600 and then No (Renamed_Object (E1))
6602 Map_Entities (E1, E2);
6611 ---------------------------
6612 -- Process_Nested_Formal --
6613 ---------------------------
6615 procedure Process_Nested_Formal (Formal : Entity_Id) is
6619 if Present (Associated_Formal_Package (Formal))
6620 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
6622 Ent := First_Entity (Formal);
6623 while Present (Ent) loop
6624 Set_Is_Hidden (Ent, False);
6625 Set_Is_Potentially_Use_Visible
6626 (Ent, Is_Potentially_Use_Visible (Formal));
6628 if Ekind (Ent) = E_Package then
6629 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal);
6630 Process_Nested_Formal (Ent);
6636 end Process_Nested_Formal;
6638 -- Start of processing for Instantiate_Formal_Package
6643 if not Is_Entity_Name (Actual)
6644 or else Ekind (Entity (Actual)) /= E_Package
6647 ("expect package instance to instantiate formal", Actual);
6648 Abandon_Instantiation (Actual);
6649 raise Program_Error;
6652 Actual_Pack := Entity (Actual);
6653 Set_Is_Instantiated (Actual_Pack);
6655 -- The actual may be a renamed package, or an outer generic
6656 -- formal package whose instantiation is converted into a renaming.
6658 if Present (Renamed_Object (Actual_Pack)) then
6659 Actual_Pack := Renamed_Object (Actual_Pack);
6662 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then
6663 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal)));
6664 Formal_Pack := Defining_Identifier (Analyzed_Formal);
6667 Generic_Parent (Specification (Analyzed_Formal));
6669 Defining_Unit_Name (Specification (Analyzed_Formal));
6672 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then
6673 Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack));
6675 Parent_Spec := Parent (Actual_Pack);
6678 if Gen_Parent = Any_Id then
6680 ("previous error in declaration of formal package", Actual);
6681 Abandon_Instantiation (Actual);
6684 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent))
6690 ("actual parameter must be instance of&", Actual, Gen_Parent);
6691 Abandon_Instantiation (Actual);
6694 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack);
6695 Map_Entities (Formal_Pack, Actual_Pack);
6698 Make_Package_Renaming_Declaration (Loc,
6699 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)),
6700 Name => New_Reference_To (Actual_Pack, Loc));
6702 Set_Associated_Formal_Package (Defining_Unit_Name (Nod),
6703 Defining_Identifier (Formal));
6704 Decls := New_List (Nod);
6706 -- If the formal F has a box, then the generic declarations are
6707 -- visible in the generic G. In an instance of G, the corresponding
6708 -- entities in the actual for F (which are the actuals for the
6709 -- instantiation of the generic that F denotes) must also be made
6710 -- visible for analysis of the current instance. On exit from the
6711 -- current instance, those entities are made private again. If the
6712 -- actual is currently in use, these entities are also use-visible.
6714 -- The loop through the actual entities also steps through the
6715 -- formal entities and enters associations from formals to
6716 -- actuals into the renaming map. This is necessary to properly
6717 -- handle checking of actual parameter associations for later
6718 -- formals that depend on actuals declared in the formal package.
6720 if Box_Present (Formal) then
6722 Gen_Decl : constant Node_Id :=
6723 Unit_Declaration_Node (Gen_Parent);
6724 Formals : constant List_Id :=
6725 Generic_Formal_Declarations (Gen_Decl);
6726 Actual_Ent : Entity_Id;
6727 Formal_Node : Node_Id;
6728 Formal_Ent : Entity_Id;
6731 if Present (Formals) then
6732 Formal_Node := First_Non_Pragma (Formals);
6734 Formal_Node := Empty;
6737 Actual_Ent := First_Entity (Actual_Pack);
6739 while Present (Actual_Ent)
6740 and then Actual_Ent /= First_Private_Entity (Actual_Pack)
6742 Set_Is_Hidden (Actual_Ent, False);
6743 Set_Is_Potentially_Use_Visible
6744 (Actual_Ent, In_Use (Actual_Pack));
6746 if Ekind (Actual_Ent) = E_Package then
6747 Process_Nested_Formal (Actual_Ent);
6750 if Present (Formal_Node) then
6751 Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent);
6753 if Present (Formal_Ent) then
6754 Find_Matching_Actual (Formal_Node, Actual_Ent);
6755 Set_Instance_Of (Formal_Ent, Actual_Ent);
6758 Next_Non_Pragma (Formal_Node);
6761 -- No further formals to match, but the generic
6762 -- part may contain inherited operation that are
6763 -- not hidden in the enclosing instance.
6765 Next_Entity (Actual_Ent);
6771 -- If the formal is not declared with a box, reanalyze it as
6772 -- an instantiation, to verify the matching rules of 12.7. The
6773 -- actual checks are performed after the generic associations
6778 I_Pack : constant Entity_Id :=
6779 Make_Defining_Identifier (Sloc (Actual),
6780 Chars => New_Internal_Name ('P'));
6783 Set_Is_Internal (I_Pack);
6786 Make_Package_Instantiation (Sloc (Actual),
6787 Defining_Unit_Name => I_Pack,
6788 Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)),
6789 Generic_Associations =>
6790 Generic_Associations (Formal)));
6796 end Instantiate_Formal_Package;
6798 -----------------------------------
6799 -- Instantiate_Formal_Subprogram --
6800 -----------------------------------
6802 function Instantiate_Formal_Subprogram
6805 Analyzed_Formal : Node_Id) return Node_Id
6807 Loc : Source_Ptr := Sloc (Instantiation_Node);
6808 Formal_Sub : constant Entity_Id :=
6809 Defining_Unit_Name (Specification (Formal));
6810 Analyzed_S : constant Entity_Id :=
6811 Defining_Unit_Name (Specification (Analyzed_Formal));
6812 Decl_Node : Node_Id;
6816 function From_Parent_Scope (Subp : Entity_Id) return Boolean;
6817 -- If the generic is a child unit, the parent has been installed
6818 -- on the scope stack, but a default subprogram cannot resolve to
6819 -- something on the parent because that parent is not really part
6820 -- of the visible context (it is there to resolve explicit local
6821 -- entities). If the default has resolved in this way, we remove
6822 -- the entity from immediate visibility and analyze the node again
6823 -- to emit an error message or find another visible candidate.
6825 procedure Valid_Actual_Subprogram (Act : Node_Id);
6826 -- Perform legality check and raise exception on failure.
6828 -----------------------
6829 -- From_Parent_Scope --
6830 -----------------------
6832 function From_Parent_Scope (Subp : Entity_Id) return Boolean is
6833 Gen_Scope : Node_Id := Scope (Analyzed_S);
6836 while Present (Gen_Scope)
6837 and then Is_Child_Unit (Gen_Scope)
6839 if Scope (Subp) = Scope (Gen_Scope) then
6843 Gen_Scope := Scope (Gen_Scope);
6847 end From_Parent_Scope;
6849 -----------------------------
6850 -- Valid_Actual_Subprogram --
6851 -----------------------------
6853 procedure Valid_Actual_Subprogram (Act : Node_Id) is
6854 Act_E : Entity_Id := Empty;
6857 if Is_Entity_Name (Act) then
6858 Act_E := Entity (Act);
6859 elsif Nkind (Act) = N_Selected_Component
6860 and then Is_Entity_Name (Selector_Name (Act))
6862 Act_E := Entity (Selector_Name (Act));
6865 if (Present (Act_E) and then Is_Overloadable (Act_E))
6866 or else Nkind (Act) = N_Attribute_Reference
6867 or else Nkind (Act) = N_Indexed_Component
6868 or else Nkind (Act) = N_Character_Literal
6869 or else Nkind (Act) = N_Explicit_Dereference
6875 ("expect subprogram or entry name in instantiation of&",
6876 Instantiation_Node, Formal_Sub);
6877 Abandon_Instantiation (Instantiation_Node);
6879 end Valid_Actual_Subprogram;
6881 -- Start of processing for Instantiate_Formal_Subprogram
6884 New_Spec := New_Copy_Tree (Specification (Formal));
6886 -- Create new entity for the actual (New_Copy_Tree does not).
6888 Set_Defining_Unit_Name
6889 (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
6891 -- Find entity of actual. If the actual is an attribute reference, it
6892 -- cannot be resolved here (its formal is missing) but is handled
6893 -- instead in Attribute_Renaming. If the actual is overloaded, it is
6894 -- fully resolved subsequently, when the renaming declaration for the
6895 -- formal is analyzed. If it is an explicit dereference, resolve the
6896 -- prefix but not the actual itself, to prevent interpretation as a
6899 if Present (Actual) then
6900 Loc := Sloc (Actual);
6901 Set_Sloc (New_Spec, Loc);
6903 if Nkind (Actual) = N_Operator_Symbol then
6904 Find_Direct_Name (Actual);
6906 elsif Nkind (Actual) = N_Explicit_Dereference then
6907 Analyze (Prefix (Actual));
6909 elsif Nkind (Actual) /= N_Attribute_Reference then
6913 Valid_Actual_Subprogram (Actual);
6916 elsif Present (Default_Name (Formal)) then
6917 if Nkind (Default_Name (Formal)) /= N_Attribute_Reference
6918 and then Nkind (Default_Name (Formal)) /= N_Selected_Component
6919 and then Nkind (Default_Name (Formal)) /= N_Indexed_Component
6920 and then Nkind (Default_Name (Formal)) /= N_Character_Literal
6921 and then Present (Entity (Default_Name (Formal)))
6923 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc);
6925 Nam := New_Copy (Default_Name (Formal));
6926 Set_Sloc (Nam, Loc);
6929 elsif Box_Present (Formal) then
6931 -- Actual is resolved at the point of instantiation. Create
6932 -- an identifier or operator with the same name as the formal.
6934 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then
6935 Nam := Make_Operator_Symbol (Loc,
6936 Chars => Chars (Formal_Sub),
6937 Strval => No_String);
6939 Nam := Make_Identifier (Loc, Chars (Formal_Sub));
6943 Error_Msg_Sloc := Sloc (Scope (Analyzed_S));
6945 ("missing actual&", Instantiation_Node, Formal_Sub);
6947 ("\in instantiation of & declared#",
6948 Instantiation_Node, Scope (Analyzed_S));
6949 Abandon_Instantiation (Instantiation_Node);
6953 Make_Subprogram_Renaming_Declaration (Loc,
6954 Specification => New_Spec,
6957 -- If we do not have an actual and the formal specified <> then
6958 -- set to get proper default.
6960 if No (Actual) and then Box_Present (Formal) then
6961 Set_From_Default (Decl_Node);
6964 -- Gather possible interpretations for the actual before analyzing the
6965 -- instance. If overloaded, it will be resolved when analyzing the
6966 -- renaming declaration.
6968 if Box_Present (Formal)
6969 and then No (Actual)
6973 if Is_Child_Unit (Scope (Analyzed_S))
6974 and then Present (Entity (Nam))
6976 if not Is_Overloaded (Nam) then
6978 if From_Parent_Scope (Entity (Nam)) then
6979 Set_Is_Immediately_Visible (Entity (Nam), False);
6980 Set_Entity (Nam, Empty);
6981 Set_Etype (Nam, Empty);
6985 Set_Is_Immediately_Visible (Entity (Nam));
6994 Get_First_Interp (Nam, I, It);
6996 while Present (It.Nam) loop
6997 if From_Parent_Scope (It.Nam) then
7001 Get_Next_Interp (I, It);
7008 -- The generic instantiation freezes the actual. This can only be
7009 -- done once the actual is resolved, in the analysis of the renaming
7010 -- declaration. To make the formal subprogram entity available, we set
7011 -- Corresponding_Formal_Spec to point to the formal subprogram entity.
7012 -- This is also needed in Analyze_Subprogram_Renaming for the processing
7013 -- of formal abstract subprograms.
7015 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S);
7017 -- We cannot analyze the renaming declaration, and thus find the
7018 -- actual, until the all the actuals are assembled in the instance.
7019 -- For subsequent checks of other actuals, indicate the node that
7020 -- will hold the instance of this formal.
7022 Set_Instance_Of (Analyzed_S, Nam);
7024 if Nkind (Actual) = N_Selected_Component
7025 and then Is_Task_Type (Etype (Prefix (Actual)))
7026 and then not Is_Frozen (Etype (Prefix (Actual)))
7028 -- The renaming declaration will create a body, which must appear
7029 -- outside of the instantiation, We move the renaming declaration
7030 -- out of the instance, and create an additional renaming inside,
7031 -- to prevent freezing anomalies.
7034 Anon_Id : constant Entity_Id :=
7035 Make_Defining_Identifier
7036 (Loc, New_Internal_Name ('E'));
7038 Set_Defining_Unit_Name (New_Spec, Anon_Id);
7039 Insert_Before (Instantiation_Node, Decl_Node);
7040 Analyze (Decl_Node);
7042 -- Now create renaming within the instance
7045 Make_Subprogram_Renaming_Declaration (Loc,
7046 Specification => New_Copy_Tree (New_Spec),
7047 Name => New_Occurrence_Of (Anon_Id, Loc));
7049 Set_Defining_Unit_Name (Specification (Decl_Node),
7050 Make_Defining_Identifier (Loc, Chars (Formal_Sub)));
7055 end Instantiate_Formal_Subprogram;
7057 ------------------------
7058 -- Instantiate_Object --
7059 ------------------------
7061 function Instantiate_Object
7064 Analyzed_Formal : Node_Id) return List_Id
7066 Formal_Id : constant Entity_Id := Defining_Identifier (Formal);
7067 Type_Id : constant Node_Id := Subtype_Mark (Formal);
7068 Loc : constant Source_Ptr := Sloc (Actual);
7069 Act_Assoc : constant Node_Id := Parent (Actual);
7070 Orig_Ftyp : constant Entity_Id :=
7071 Etype (Defining_Identifier (Analyzed_Formal));
7072 List : constant List_Id := New_List;
7074 Decl_Node : Node_Id;
7075 Subt_Decl : Node_Id := Empty;
7078 -- Sloc for error message on missing actual.
7079 Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal)));
7081 if Get_Instance_Of (Formal_Id) /= Formal_Id then
7082 Error_Msg_N ("duplicate instantiation of generic parameter", Actual);
7085 Set_Parent (List, Parent (Actual));
7089 if Out_Present (Formal) then
7091 -- An IN OUT generic actual must be a name. The instantiation is
7092 -- a renaming declaration. The actual is the name being renamed.
7093 -- We use the actual directly, rather than a copy, because it is not
7094 -- used further in the list of actuals, and because a copy or a use
7095 -- of relocate_node is incorrect if the instance is nested within
7096 -- a generic. In order to simplify ASIS searches, the Generic_Parent
7097 -- field links the declaration to the generic association.
7102 Instantiation_Node, Formal_Id);
7104 ("\in instantiation of & declared#",
7106 Scope (Defining_Identifier (Analyzed_Formal)));
7107 Abandon_Instantiation (Instantiation_Node);
7111 Make_Object_Renaming_Declaration (Loc,
7112 Defining_Identifier => New_Copy (Formal_Id),
7113 Subtype_Mark => New_Copy_Tree (Type_Id),
7116 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
7118 -- The analysis of the actual may produce insert_action nodes, so
7119 -- the declaration must have a context in which to attach them.
7121 Append (Decl_Node, List);
7124 -- This check is performed here because Analyze_Object_Renaming
7125 -- will not check it when Comes_From_Source is False. Note
7126 -- though that the check for the actual being the name of an
7127 -- object will be performed in Analyze_Object_Renaming.
7129 if Is_Object_Reference (Actual)
7130 and then Is_Dependent_Component_Of_Mutable_Object (Actual)
7133 ("illegal discriminant-dependent component for in out parameter",
7137 -- The actual has to be resolved in order to check that it is
7138 -- a variable (due to cases such as F(1), where F returns
7139 -- access to an array, and for overloaded prefixes).
7142 Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal)));
7144 if Is_Private_Type (Ftyp)
7145 and then not Is_Private_Type (Etype (Actual))
7146 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual))
7147 or else Base_Type (Etype (Actual)) = Ftyp)
7149 -- If the actual has the type of the full view of the formal,
7150 -- or else a non-private subtype of the formal, then
7151 -- the visibility of the formal type has changed. Add to the
7152 -- actuals a subtype declaration that will force the exchange
7153 -- of views in the body of the instance as well.
7156 Make_Subtype_Declaration (Loc,
7157 Defining_Identifier =>
7158 Make_Defining_Identifier (Loc, New_Internal_Name ('P')),
7159 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc));
7161 Prepend (Subt_Decl, List);
7163 Append_Elmt (Full_View (Ftyp), Exchanged_Views);
7164 Exchange_Declarations (Ftyp);
7167 Resolve (Actual, Ftyp);
7169 if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then
7171 ("actual for& must be a variable", Actual, Formal_Id);
7173 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then
7175 "type of actual does not match type of&", Actual, Formal_Id);
7179 Note_Possible_Modification (Actual);
7181 -- Check for instantiation of atomic/volatile actual for
7182 -- non-atomic/volatile formal (RM C.6 (12)).
7184 if Is_Atomic_Object (Actual)
7185 and then not Is_Atomic (Orig_Ftyp)
7188 ("cannot instantiate non-atomic formal object " &
7189 "with atomic actual", Actual);
7191 elsif Is_Volatile_Object (Actual)
7192 and then not Is_Volatile (Orig_Ftyp)
7195 ("cannot instantiate non-volatile formal object " &
7196 "with volatile actual", Actual);
7202 -- The instantiation of a generic formal in-parameter
7203 -- is a constant declaration. The actual is the expression for
7204 -- that declaration.
7206 if Present (Actual) then
7208 Decl_Node := Make_Object_Declaration (Loc,
7209 Defining_Identifier => New_Copy (Formal_Id),
7210 Constant_Present => True,
7211 Object_Definition => New_Copy_Tree (Type_Id),
7212 Expression => Actual);
7214 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc);
7216 -- A generic formal object of a tagged type is defined
7217 -- to be aliased so the new constant must also be treated
7221 (Etype (Defining_Identifier (Analyzed_Formal)))
7223 Set_Aliased_Present (Decl_Node);
7226 Append (Decl_Node, List);
7228 -- No need to repeat (pre-)analysis of some expression nodes
7229 -- already handled in Pre_Analyze_Actuals.
7231 if Nkind (Actual) /= N_Allocator then
7236 Typ : constant Entity_Id :=
7238 (Etype (Defining_Identifier (Analyzed_Formal)));
7241 Freeze_Before (Instantiation_Node, Typ);
7243 -- If the actual is an aggregate, perform name resolution
7244 -- on its components (the analysis of an aggregate does not
7245 -- do it) to capture local names that may be hidden if the
7246 -- generic is a child unit.
7248 if Nkind (Actual) = N_Aggregate then
7249 Pre_Analyze_And_Resolve (Actual, Typ);
7253 elsif Present (Expression (Formal)) then
7255 -- Use default to construct declaration.
7258 Make_Object_Declaration (Sloc (Formal),
7259 Defining_Identifier => New_Copy (Formal_Id),
7260 Constant_Present => True,
7261 Object_Definition => New_Copy (Type_Id),
7262 Expression => New_Copy_Tree (Expression (Formal)));
7264 Append (Decl_Node, List);
7265 Set_Analyzed (Expression (Decl_Node), False);
7270 Instantiation_Node, Formal_Id);
7271 Error_Msg_NE ("\in instantiation of & declared#",
7273 Scope (Defining_Identifier (Analyzed_Formal)));
7276 (Etype (Defining_Identifier (Analyzed_Formal)))
7278 -- Create dummy constant declaration so that instance can
7279 -- be analyzed, to minimize cascaded visibility errors.
7282 Make_Object_Declaration (Loc,
7283 Defining_Identifier => New_Copy (Formal_Id),
7284 Constant_Present => True,
7285 Object_Definition => New_Copy (Type_Id),
7287 Make_Attribute_Reference (Sloc (Formal_Id),
7288 Attribute_Name => Name_First,
7289 Prefix => New_Copy (Type_Id)));
7291 Append (Decl_Node, List);
7294 Abandon_Instantiation (Instantiation_Node);
7301 end Instantiate_Object;
7303 ------------------------------
7304 -- Instantiate_Package_Body --
7305 ------------------------------
7307 procedure Instantiate_Package_Body
7308 (Body_Info : Pending_Body_Info;
7309 Inlined_Body : Boolean := False)
7311 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7312 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7313 Loc : constant Source_Ptr := Sloc (Inst_Node);
7315 Gen_Id : constant Node_Id := Name (Inst_Node);
7316 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7317 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7318 Act_Spec : constant Node_Id := Specification (Act_Decl);
7319 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec);
7321 Act_Body_Name : Node_Id;
7323 Gen_Body_Id : Node_Id;
7325 Act_Body_Id : Entity_Id;
7327 Parent_Installed : Boolean := False;
7328 Save_Style_Check : constant Boolean := Style_Check;
7331 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7333 -- The instance body may already have been processed, as the parent
7334 -- of another instance that is inlined. (Load_Parent_Of_Generic).
7336 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then
7340 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7342 if No (Gen_Body_Id) then
7343 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7344 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7347 -- Establish global variable for sloc adjustment and for error
7350 Instantiation_Node := Inst_Node;
7352 if Present (Gen_Body_Id) then
7353 Save_Env (Gen_Unit, Act_Decl_Id);
7354 Style_Check := False;
7355 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7357 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7359 Create_Instantiation_Source
7360 (Inst_Node, Gen_Body_Id, False, S_Adjustment);
7364 (Original_Node (Gen_Body), Empty, Instantiating => True);
7366 -- Build new name (possibly qualified) for body declaration
7368 Act_Body_Id := New_Copy (Act_Decl_Id);
7370 -- Some attributes of the spec entity are not inherited by the
7373 Set_Handler_Records (Act_Body_Id, No_List);
7375 if Nkind (Defining_Unit_Name (Act_Spec)) =
7376 N_Defining_Program_Unit_Name
7379 Make_Defining_Program_Unit_Name (Loc,
7380 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))),
7381 Defining_Identifier => Act_Body_Id);
7383 Act_Body_Name := Act_Body_Id;
7386 Set_Defining_Unit_Name (Act_Body, Act_Body_Name);
7388 Set_Corresponding_Spec (Act_Body, Act_Decl_Id);
7389 Check_Generic_Actuals (Act_Decl_Id, False);
7391 -- If it is a child unit, make the parent instance (which is an
7392 -- instance of the parent of the generic) visible. The parent
7393 -- instance is the prefix of the name of the generic unit.
7395 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7396 and then Nkind (Gen_Id) = N_Expanded_Name
7398 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7399 Parent_Installed := True;
7401 elsif Is_Child_Unit (Gen_Unit) then
7402 Install_Parent (Scope (Gen_Unit), In_Body => True);
7403 Parent_Installed := True;
7406 -- If the instantiation is a library unit, and this is the main
7407 -- unit, then build the resulting compilation unit nodes for the
7408 -- instance. If this is a compilation unit but it is not the main
7409 -- unit, then it is the body of a unit in the context, that is being
7410 -- compiled because it is encloses some inlined unit or another
7411 -- generic unit being instantiated. In that case, this body is not
7412 -- part of the current compilation, and is not attached to the tree,
7413 -- but its parent must be set for analysis.
7415 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7417 -- Replace instance node with body of instance, and create
7418 -- new node for corresponding instance declaration.
7420 Build_Instance_Compilation_Unit_Nodes
7421 (Inst_Node, Act_Body, Act_Decl);
7422 Analyze (Inst_Node);
7424 if Parent (Inst_Node) = Cunit (Main_Unit) then
7426 -- If the instance is a child unit itself, then set the
7427 -- scope of the expanded body to be the parent of the
7428 -- instantiation (ensuring that the fully qualified name
7429 -- will be generated for the elaboration subprogram).
7431 if Nkind (Defining_Unit_Name (Act_Spec)) =
7432 N_Defining_Program_Unit_Name
7435 (Defining_Entity (Inst_Node), Scope (Act_Decl_Id));
7439 -- Case where instantiation is not a library unit
7442 -- If this is an early instantiation, i.e. appears textually
7443 -- before the corresponding body and must be elaborated first,
7444 -- indicate that the body instance is to be delayed.
7446 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl);
7448 -- Now analyze the body. We turn off all checks if this is
7449 -- an internal unit, since there is no reason to have checks
7450 -- on for any predefined run-time library code. All such
7451 -- code is designed to be compiled with checks off.
7453 -- Note that we do NOT apply this criterion to children of
7454 -- GNAT (or on VMS, children of DEC). The latter units must
7455 -- suppress checks explicitly if this is needed.
7457 if Is_Predefined_File_Name
7458 (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
7460 Analyze (Act_Body, Suppress => All_Checks);
7466 if not Generic_Separately_Compiled (Gen_Unit) then
7467 Inherit_Context (Gen_Body, Inst_Node);
7470 -- Remove the parent instances if they have been placed on the
7471 -- scope stack to compile the body.
7473 if Parent_Installed then
7474 Remove_Parent (In_Body => True);
7477 Restore_Private_Views (Act_Decl_Id);
7479 -- Remove the current unit from visibility if this is an instance
7480 -- that is not elaborated on the fly for inlining purposes.
7482 if not Inlined_Body then
7483 Set_Is_Immediately_Visible (Act_Decl_Id, False);
7487 Style_Check := Save_Style_Check;
7489 -- If we have no body, and the unit requires a body, then complain.
7490 -- This complaint is suppressed if we have detected other errors
7491 -- (since a common reason for missing the body is that it had errors).
7493 elsif Unit_Requires_Body (Gen_Unit) then
7494 if Serious_Errors_Detected = 0 then
7496 ("cannot find body of generic package &", Inst_Node, Gen_Unit);
7498 -- Don't attempt to perform any cleanup actions if some other
7499 -- error was aready detected, since this can cause blowups.
7505 -- Case of package that does not need a body
7508 -- If the instantiation of the declaration is a library unit,
7509 -- rewrite the original package instantiation as a package
7510 -- declaration in the compilation unit node.
7512 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7513 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node));
7514 Rewrite (Inst_Node, Act_Decl);
7516 -- Generate elaboration entity, in case spec has elaboration
7517 -- code. This cannot be done when the instance is analyzed,
7518 -- because it is not known yet whether the body exists.
7520 Set_Elaboration_Entity_Required (Act_Decl_Id, False);
7521 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id);
7523 -- If the instantiation is not a library unit, then append the
7524 -- declaration to the list of implicitly generated entities.
7525 -- unless it is already a list member which means that it was
7526 -- already processed
7528 elsif not Is_List_Member (Act_Decl) then
7529 Mark_Rewrite_Insertion (Act_Decl);
7530 Insert_Before (Inst_Node, Act_Decl);
7534 Expander_Mode_Restore;
7535 end Instantiate_Package_Body;
7537 ---------------------------------
7538 -- Instantiate_Subprogram_Body --
7539 ---------------------------------
7541 procedure Instantiate_Subprogram_Body
7542 (Body_Info : Pending_Body_Info)
7544 Act_Decl : constant Node_Id := Body_Info.Act_Decl;
7545 Inst_Node : constant Node_Id := Body_Info.Inst_Node;
7546 Loc : constant Source_Ptr := Sloc (Inst_Node);
7547 Gen_Id : constant Node_Id := Name (Inst_Node);
7548 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node);
7549 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit);
7550 Anon_Id : constant Entity_Id :=
7551 Defining_Unit_Name (Specification (Act_Decl));
7552 Pack_Id : constant Entity_Id :=
7553 Defining_Unit_Name (Parent (Act_Decl));
7556 Gen_Body_Id : Node_Id;
7558 Act_Body_Id : Entity_Id;
7559 Pack_Body : Node_Id;
7560 Prev_Formal : Entity_Id;
7562 Unit_Renaming : Node_Id;
7564 Parent_Installed : Boolean := False;
7565 Save_Style_Check : constant Boolean := Style_Check;
7568 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7570 Expander_Mode_Save_And_Set (Body_Info.Expander_Status);
7572 if No (Gen_Body_Id) then
7573 Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl));
7574 Gen_Body_Id := Corresponding_Body (Gen_Decl);
7577 Instantiation_Node := Inst_Node;
7579 if Present (Gen_Body_Id) then
7580 Gen_Body := Unit_Declaration_Node (Gen_Body_Id);
7582 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then
7584 -- Either body is not present, or context is non-expanding, as
7585 -- when compiling a subunit. Mark the instance as completed, and
7586 -- diagnose a missing body when needed.
7589 and then Operating_Mode = Generate_Code
7592 ("missing proper body for instantiation", Gen_Body);
7595 Set_Has_Completion (Anon_Id);
7599 Save_Env (Gen_Unit, Anon_Id);
7600 Style_Check := False;
7601 Current_Sem_Unit := Body_Info.Current_Sem_Unit;
7602 Create_Instantiation_Source
7610 (Original_Node (Gen_Body), Empty, Instantiating => True);
7611 Act_Body_Id := Defining_Entity (Act_Body);
7612 Set_Chars (Act_Body_Id, Chars (Anon_Id));
7613 Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node)));
7614 Set_Corresponding_Spec (Act_Body, Anon_Id);
7615 Set_Has_Completion (Anon_Id);
7616 Check_Generic_Actuals (Pack_Id, False);
7618 -- If it is a child unit, make the parent instance (which is an
7619 -- instance of the parent of the generic) visible. The parent
7620 -- instance is the prefix of the name of the generic unit.
7622 if Ekind (Scope (Gen_Unit)) = E_Generic_Package
7623 and then Nkind (Gen_Id) = N_Expanded_Name
7625 Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True);
7626 Parent_Installed := True;
7628 elsif Is_Child_Unit (Gen_Unit) then
7629 Install_Parent (Scope (Gen_Unit), In_Body => True);
7630 Parent_Installed := True;
7633 -- Inside its body, a reference to the generic unit is a reference
7634 -- to the instance. The corresponding renaming is the first
7635 -- declaration in the body.
7638 Make_Subprogram_Renaming_Declaration (Loc,
7641 Specification (Original_Node (Gen_Body)),
7643 Instantiating => True),
7644 Name => New_Occurrence_Of (Anon_Id, Loc));
7646 -- If there is a formal subprogram with the same name as the
7647 -- unit itself, do not add this renaming declaration. This is
7648 -- a temporary fix for one ACVC test. ???
7650 Prev_Formal := First_Entity (Pack_Id);
7651 while Present (Prev_Formal) loop
7652 if Chars (Prev_Formal) = Chars (Gen_Unit)
7653 and then Is_Overloadable (Prev_Formal)
7658 Next_Entity (Prev_Formal);
7661 if Present (Prev_Formal) then
7662 Decls := New_List (Act_Body);
7664 Decls := New_List (Unit_Renaming, Act_Body);
7667 -- The subprogram body is placed in the body of a dummy package
7668 -- body, whose spec contains the subprogram declaration as well
7669 -- as the renaming declarations for the generic parameters.
7671 Pack_Body := Make_Package_Body (Loc,
7672 Defining_Unit_Name => New_Copy (Pack_Id),
7673 Declarations => Decls);
7675 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7677 -- If the instantiation is a library unit, then build resulting
7678 -- compilation unit nodes for the instance. The declaration of
7679 -- the enclosing package is the grandparent of the subprogram
7680 -- declaration. First replace the instantiation node as the unit
7681 -- of the corresponding compilation.
7683 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then
7684 if Parent (Inst_Node) = Cunit (Main_Unit) then
7685 Set_Unit (Parent (Inst_Node), Inst_Node);
7686 Build_Instance_Compilation_Unit_Nodes
7687 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl)));
7688 Analyze (Inst_Node);
7690 Set_Parent (Pack_Body, Parent (Inst_Node));
7691 Analyze (Pack_Body);
7695 Insert_Before (Inst_Node, Pack_Body);
7696 Mark_Rewrite_Insertion (Pack_Body);
7697 Analyze (Pack_Body);
7699 if Expander_Active then
7700 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id);
7704 if not Generic_Separately_Compiled (Gen_Unit) then
7705 Inherit_Context (Gen_Body, Inst_Node);
7708 Restore_Private_Views (Pack_Id, False);
7710 if Parent_Installed then
7711 Remove_Parent (In_Body => True);
7715 Style_Check := Save_Style_Check;
7717 -- Body not found. Error was emitted already. If there were no
7718 -- previous errors, this may be an instance whose scope is a premature
7719 -- instance. In that case we must insure that the (legal) program does
7720 -- raise program error if executed. We generate a subprogram body for
7721 -- this purpose. See DEC ac30vso.
7723 elsif Serious_Errors_Detected = 0
7724 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit
7726 if Ekind (Anon_Id) = E_Procedure then
7728 Make_Subprogram_Body (Loc,
7730 Make_Procedure_Specification (Loc,
7731 Defining_Unit_Name => New_Copy (Anon_Id),
7732 Parameter_Specifications =>
7734 (Parameter_Specifications (Parent (Anon_Id)))),
7736 Declarations => Empty_List,
7737 Handled_Statement_Sequence =>
7738 Make_Handled_Sequence_Of_Statements (Loc,
7741 Make_Raise_Program_Error (Loc,
7743 PE_Access_Before_Elaboration))));
7747 Make_Raise_Program_Error (Loc,
7748 Reason => PE_Access_Before_Elaboration);
7750 Set_Etype (Ret_Expr, (Etype (Anon_Id)));
7751 Set_Analyzed (Ret_Expr);
7754 Make_Subprogram_Body (Loc,
7756 Make_Function_Specification (Loc,
7757 Defining_Unit_Name => New_Copy (Anon_Id),
7758 Parameter_Specifications =>
7760 (Parameter_Specifications (Parent (Anon_Id))),
7762 New_Occurrence_Of (Etype (Anon_Id), Loc)),
7764 Declarations => Empty_List,
7765 Handled_Statement_Sequence =>
7766 Make_Handled_Sequence_Of_Statements (Loc,
7768 New_List (Make_Return_Statement (Loc, Ret_Expr))));
7771 Pack_Body := Make_Package_Body (Loc,
7772 Defining_Unit_Name => New_Copy (Pack_Id),
7773 Declarations => New_List (Act_Body));
7775 Insert_After (Inst_Node, Pack_Body);
7776 Set_Corresponding_Spec (Pack_Body, Pack_Id);
7777 Analyze (Pack_Body);
7780 Expander_Mode_Restore;
7781 end Instantiate_Subprogram_Body;
7783 ----------------------
7784 -- Instantiate_Type --
7785 ----------------------
7787 function Instantiate_Type
7790 Analyzed_Formal : Node_Id;
7791 Actual_Decls : List_Id) return Node_Id
7793 Loc : constant Source_Ptr := Sloc (Actual);
7794 Gen_T : constant Entity_Id := Defining_Identifier (Formal);
7795 A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal);
7796 Ancestor : Entity_Id := Empty;
7797 Def : constant Node_Id := Formal_Type_Definition (Formal);
7799 Decl_Node : Node_Id;
7801 procedure Validate_Array_Type_Instance;
7802 procedure Validate_Access_Subprogram_Instance;
7803 procedure Validate_Access_Type_Instance;
7804 procedure Validate_Derived_Type_Instance;
7805 procedure Validate_Private_Type_Instance;
7806 -- These procedures perform validation tests for the named case
7808 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean;
7809 -- Check that base types are the same and that the subtypes match
7810 -- statically. Used in several of the above.
7812 --------------------
7813 -- Subtypes_Match --
7814 --------------------
7816 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is
7817 T : constant Entity_Id := Get_Instance_Of (Gen_T);
7820 return (Base_Type (T) = Base_Type (Act_T)
7821 -- why is the and then commented out here???
7822 -- and then Is_Constrained (T) = Is_Constrained (Act_T)
7823 and then Subtypes_Statically_Match (T, Act_T))
7825 or else (Is_Class_Wide_Type (Gen_T)
7826 and then Is_Class_Wide_Type (Act_T)
7829 Get_Instance_Of (Root_Type (Gen_T)),
7830 Root_Type (Act_T)));
7833 -----------------------------------------
7834 -- Validate_Access_Subprogram_Instance --
7835 -----------------------------------------
7837 procedure Validate_Access_Subprogram_Instance is
7839 if not Is_Access_Type (Act_T)
7840 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type
7843 ("expect access type in instantiation of &", Actual, Gen_T);
7844 Abandon_Instantiation (Actual);
7847 Check_Mode_Conformant
7848 (Designated_Type (Act_T),
7849 Designated_Type (A_Gen_T),
7853 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then
7854 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then
7856 ("protected access type not allowed for formal &",
7860 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then
7862 ("expect protected access type for formal &",
7865 end Validate_Access_Subprogram_Instance;
7867 -----------------------------------
7868 -- Validate_Access_Type_Instance --
7869 -----------------------------------
7871 procedure Validate_Access_Type_Instance is
7872 Desig_Type : constant Entity_Id :=
7874 (Designated_Type (A_Gen_T), Scope (A_Gen_T));
7877 if not Is_Access_Type (Act_T) then
7879 ("expect access type in instantiation of &", Actual, Gen_T);
7880 Abandon_Instantiation (Actual);
7883 if Is_Access_Constant (A_Gen_T) then
7884 if not Is_Access_Constant (Act_T) then
7886 ("actual type must be access-to-constant type", Actual);
7887 Abandon_Instantiation (Actual);
7890 if Is_Access_Constant (Act_T) then
7892 ("actual type must be access-to-variable type", Actual);
7893 Abandon_Instantiation (Actual);
7895 elsif Ekind (A_Gen_T) = E_General_Access_Type
7896 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type
7898 Error_Msg_N ("actual must be general access type!", Actual);
7899 Error_Msg_NE ("add ALL to }!", Actual, Act_T);
7900 Abandon_Instantiation (Actual);
7904 -- The designated subtypes, that is to say the subtypes introduced
7905 -- by an access type declaration (and not by a subtype declaration)
7908 if not Subtypes_Match
7909 (Desig_Type, Designated_Type (Base_Type (Act_T)))
7912 ("designated type of actual does not match that of formal &",
7914 Abandon_Instantiation (Actual);
7916 elsif Is_Access_Type (Designated_Type (Act_T))
7917 and then Is_Constrained (Designated_Type (Designated_Type (Act_T)))
7919 Is_Constrained (Designated_Type (Desig_Type))
7922 ("designated type of actual does not match that of formal &",
7924 Abandon_Instantiation (Actual);
7926 end Validate_Access_Type_Instance;
7928 ----------------------------------
7929 -- Validate_Array_Type_Instance --
7930 ----------------------------------
7932 procedure Validate_Array_Type_Instance is
7937 function Formal_Dimensions return Int;
7938 -- Count number of dimensions in array type formal
7940 -----------------------
7941 -- Formal_Dimensions --
7942 -----------------------
7944 function Formal_Dimensions return Int is
7949 if Nkind (Def) = N_Constrained_Array_Definition then
7950 Index := First (Discrete_Subtype_Definitions (Def));
7952 Index := First (Subtype_Marks (Def));
7955 while Present (Index) loop
7961 end Formal_Dimensions;
7963 -- Start of processing for Validate_Array_Type_Instance
7966 if not Is_Array_Type (Act_T) then
7968 ("expect array type in instantiation of &", Actual, Gen_T);
7969 Abandon_Instantiation (Actual);
7971 elsif Nkind (Def) = N_Constrained_Array_Definition then
7972 if not (Is_Constrained (Act_T)) then
7974 ("expect constrained array in instantiation of &",
7976 Abandon_Instantiation (Actual);
7980 if Is_Constrained (Act_T) then
7982 ("expect unconstrained array in instantiation of &",
7984 Abandon_Instantiation (Actual);
7988 if Formal_Dimensions /= Number_Dimensions (Act_T) then
7990 ("dimensions of actual do not match formal &", Actual, Gen_T);
7991 Abandon_Instantiation (Actual);
7994 I1 := First_Index (A_Gen_T);
7995 I2 := First_Index (Act_T);
7996 for J in 1 .. Formal_Dimensions loop
7998 -- If the indices of the actual were given by a subtype_mark,
7999 -- the index was transformed into a range attribute. Retrieve
8000 -- the original type mark for checking.
8002 if Is_Entity_Name (Original_Node (I2)) then
8003 T2 := Entity (Original_Node (I2));
8008 if not Subtypes_Match
8009 (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2)
8012 ("index types of actual do not match those of formal &",
8014 Abandon_Instantiation (Actual);
8021 if not Subtypes_Match (
8022 Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)),
8023 Component_Type (Act_T))
8026 ("component subtype of actual does not match that of formal &",
8028 Abandon_Instantiation (Actual);
8031 if Has_Aliased_Components (A_Gen_T)
8032 and then not Has_Aliased_Components (Act_T)
8035 ("actual must have aliased components to match formal type &",
8039 end Validate_Array_Type_Instance;
8041 ------------------------------------
8042 -- Validate_Derived_Type_Instance --
8043 ------------------------------------
8045 procedure Validate_Derived_Type_Instance is
8046 Actual_Discr : Entity_Id;
8047 Ancestor_Discr : Entity_Id;
8050 -- If the parent type in the generic declaration is itself
8051 -- a previous formal type, then it is local to the generic
8052 -- and absent from the analyzed generic definition. In that
8053 -- case the ancestor is the instance of the formal (which must
8054 -- have been instantiated previously), unless the ancestor is
8055 -- itself a formal derived type. In this latter case (which is the
8056 -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the
8057 -- formals is the ancestor of its parent. Otherwise, the analyzed
8058 -- generic carries the parent type. If the parent type is defined
8059 -- in a previous formal package, then the scope of that formal
8060 -- package is that of the generic type itself, and it has already
8061 -- been mapped into the corresponding type in the actual package.
8063 -- Common case: parent type defined outside of the generic
8065 if Is_Entity_Name (Subtype_Mark (Def))
8066 and then Present (Entity (Subtype_Mark (Def)))
8068 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def)));
8070 -- Check whether parent is defined in a previous formal package
8073 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T)
8076 Get_Instance_Of (Base_Type (Etype (A_Gen_T)));
8078 -- The type may be a local derivation, or a type extension of
8079 -- a previous formal, or of a formal of a parent package.
8081 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T))
8083 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private
8085 -- Check whether the parent is another derived formal type
8086 -- in the same generic unit.
8088 if Etype (A_Gen_T) /= A_Gen_T
8089 and then Is_Generic_Type (Etype (A_Gen_T))
8090 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T)
8091 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T)
8093 -- Locate ancestor of parent from the subtype declaration
8094 -- created for the actual.
8100 Decl := First (Actual_Decls);
8101 while Present (Decl) loop
8102 if Nkind (Decl) = N_Subtype_Declaration
8103 and then Chars (Defining_Identifier (Decl)) =
8104 Chars (Etype (A_Gen_T))
8106 Ancestor := Generic_Parent_Type (Decl);
8114 pragma Assert (Present (Ancestor));
8118 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T)));
8122 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T)));
8125 if not Is_Ancestor (Base_Type (Ancestor), Act_T) then
8127 ("expect type derived from & in instantiation",
8128 Actual, First_Subtype (Ancestor));
8129 Abandon_Instantiation (Actual);
8132 -- Perform atomic/volatile checks (RM C.6(12))
8134 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then
8136 ("cannot have atomic actual type for non-atomic formal type",
8139 elsif Is_Volatile (Act_T)
8140 and then not Is_Volatile (Ancestor)
8141 and then Is_By_Reference_Type (Ancestor)
8144 ("cannot have volatile actual type for non-volatile formal type",
8148 -- It should not be necessary to check for unknown discriminants
8149 -- on Formal, but for some reason Has_Unknown_Discriminants is
8150 -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly
8151 -- returns False. This needs fixing. ???
8153 if not Is_Indefinite_Subtype (A_Gen_T)
8154 and then not Unknown_Discriminants_Present (Formal)
8155 and then Is_Indefinite_Subtype (Act_T)
8158 ("actual subtype must be constrained", Actual);
8159 Abandon_Instantiation (Actual);
8162 if not Unknown_Discriminants_Present (Formal) then
8163 if Is_Constrained (Ancestor) then
8164 if not Is_Constrained (Act_T) then
8166 ("actual subtype must be constrained", Actual);
8167 Abandon_Instantiation (Actual);
8170 -- Ancestor is unconstrained
8172 elsif Is_Constrained (Act_T) then
8173 if Ekind (Ancestor) = E_Access_Type
8174 or else Is_Composite_Type (Ancestor)
8177 ("actual subtype must be unconstrained", Actual);
8178 Abandon_Instantiation (Actual);
8181 -- A class-wide type is only allowed if the formal has
8182 -- unknown discriminants.
8184 elsif Is_Class_Wide_Type (Act_T)
8185 and then not Has_Unknown_Discriminants (Ancestor)
8188 ("actual for & cannot be a class-wide type", Actual, Gen_T);
8189 Abandon_Instantiation (Actual);
8191 -- Otherwise, the formal and actual shall have the same
8192 -- number of discriminants and each discriminant of the
8193 -- actual must correspond to a discriminant of the formal.
8195 elsif Has_Discriminants (Act_T)
8196 and then not Has_Unknown_Discriminants (Act_T)
8197 and then Has_Discriminants (Ancestor)
8199 Actual_Discr := First_Discriminant (Act_T);
8200 Ancestor_Discr := First_Discriminant (Ancestor);
8201 while Present (Actual_Discr)
8202 and then Present (Ancestor_Discr)
8204 if Base_Type (Act_T) /= Base_Type (Ancestor) and then
8205 not Present (Corresponding_Discriminant (Actual_Discr))
8208 ("discriminant & does not correspond " &
8209 "to ancestor discriminant", Actual, Actual_Discr);
8210 Abandon_Instantiation (Actual);
8213 Next_Discriminant (Actual_Discr);
8214 Next_Discriminant (Ancestor_Discr);
8217 if Present (Actual_Discr) or else Present (Ancestor_Discr) then
8219 ("actual for & must have same number of discriminants",
8221 Abandon_Instantiation (Actual);
8224 -- This case should be caught by the earlier check for
8225 -- for constrainedness, but the check here is added for
8228 elsif Has_Discriminants (Act_T)
8229 and then not Has_Unknown_Discriminants (Act_T)
8232 ("actual for & must not have discriminants", Actual, Gen_T);
8233 Abandon_Instantiation (Actual);
8235 elsif Has_Discriminants (Ancestor) then
8237 ("actual for & must have known discriminants", Actual, Gen_T);
8238 Abandon_Instantiation (Actual);
8241 if not Subtypes_Statically_Compatible (Act_T, Ancestor) then
8243 ("constraint on actual is incompatible with formal", Actual);
8244 Abandon_Instantiation (Actual);
8247 end Validate_Derived_Type_Instance;
8249 ------------------------------------
8250 -- Validate_Private_Type_Instance --
8251 ------------------------------------
8253 procedure Validate_Private_Type_Instance is
8254 Formal_Discr : Entity_Id;
8255 Actual_Discr : Entity_Id;
8256 Formal_Subt : Entity_Id;
8259 if Is_Limited_Type (Act_T)
8260 and then not Is_Limited_Type (A_Gen_T)
8263 ("actual for non-limited & cannot be a limited type", Actual,
8265 Explain_Limited_Type (Act_T, Actual);
8266 Abandon_Instantiation (Actual);
8268 elsif Is_Indefinite_Subtype (Act_T)
8269 and then not Is_Indefinite_Subtype (A_Gen_T)
8270 and then Ada_Version >= Ada_95
8273 ("actual for & must be a definite subtype", Actual, Gen_T);
8275 elsif not Is_Tagged_Type (Act_T)
8276 and then Is_Tagged_Type (A_Gen_T)
8279 ("actual for & must be a tagged type", Actual, Gen_T);
8281 elsif Has_Discriminants (A_Gen_T) then
8282 if not Has_Discriminants (Act_T) then
8284 ("actual for & must have discriminants", Actual, Gen_T);
8285 Abandon_Instantiation (Actual);
8287 elsif Is_Constrained (Act_T) then
8289 ("actual for & must be unconstrained", Actual, Gen_T);
8290 Abandon_Instantiation (Actual);
8293 Formal_Discr := First_Discriminant (A_Gen_T);
8294 Actual_Discr := First_Discriminant (Act_T);
8295 while Formal_Discr /= Empty loop
8296 if Actual_Discr = Empty then
8298 ("discriminants on actual do not match formal",
8300 Abandon_Instantiation (Actual);
8303 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr));
8305 -- access discriminants match if designated types do.
8307 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type
8308 and then (Ekind (Base_Type (Etype (Actual_Discr))))
8309 = E_Anonymous_Access_Type
8310 and then Get_Instance_Of (
8311 Designated_Type (Base_Type (Formal_Subt)))
8312 = Designated_Type (Base_Type (Etype (Actual_Discr)))
8316 elsif Base_Type (Formal_Subt) /=
8317 Base_Type (Etype (Actual_Discr))
8320 ("types of actual discriminants must match formal",
8322 Abandon_Instantiation (Actual);
8324 elsif not Subtypes_Statically_Match
8325 (Formal_Subt, Etype (Actual_Discr))
8326 and then Ada_Version >= Ada_95
8329 ("subtypes of actual discriminants must match formal",
8331 Abandon_Instantiation (Actual);
8334 Next_Discriminant (Formal_Discr);
8335 Next_Discriminant (Actual_Discr);
8338 if Actual_Discr /= Empty then
8340 ("discriminants on actual do not match formal",
8342 Abandon_Instantiation (Actual);
8349 end Validate_Private_Type_Instance;
8351 -- Start of processing for Instantiate_Type
8354 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then
8355 Error_Msg_N ("duplicate instantiation of generic type", Actual);
8358 elsif not Is_Entity_Name (Actual)
8359 or else not Is_Type (Entity (Actual))
8362 ("expect valid subtype mark to instantiate &", Actual, Gen_T);
8363 Abandon_Instantiation (Actual);
8366 Act_T := Entity (Actual);
8368 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed
8369 -- as a generic actual parameter if the corresponding formal type
8370 -- does not have a known_discriminant_part, or is a formal derived
8371 -- type that is an Unchecked_Union type.
8373 if Is_Unchecked_Union (Base_Type (Act_T)) then
8374 if not Has_Discriminants (A_Gen_T)
8376 (Is_Derived_Type (A_Gen_T)
8378 Is_Unchecked_Union (A_Gen_T))
8382 Error_Msg_N ("Unchecked_Union cannot be the actual for a" &
8383 " discriminated formal type", Act_T);
8388 -- Deal with fixed/floating restrictions
8390 if Is_Floating_Point_Type (Act_T) then
8391 Check_Restriction (No_Floating_Point, Actual);
8392 elsif Is_Fixed_Point_Type (Act_T) then
8393 Check_Restriction (No_Fixed_Point, Actual);
8396 -- Deal with error of using incomplete type as generic actual
8398 if Ekind (Act_T) = E_Incomplete_Type then
8399 if No (Underlying_Type (Act_T)) then
8400 Error_Msg_N ("premature use of incomplete type", Actual);
8401 Abandon_Instantiation (Actual);
8403 Act_T := Full_View (Act_T);
8404 Set_Entity (Actual, Act_T);
8406 if Has_Private_Component (Act_T) then
8408 ("premature use of type with private component", Actual);
8412 -- Deal with error of premature use of private type as generic actual
8414 elsif Is_Private_Type (Act_T)
8415 and then Is_Private_Type (Base_Type (Act_T))
8416 and then not Is_Generic_Type (Act_T)
8417 and then not Is_Derived_Type (Act_T)
8418 and then No (Full_View (Root_Type (Act_T)))
8420 Error_Msg_N ("premature use of private type", Actual);
8422 elsif Has_Private_Component (Act_T) then
8424 ("premature use of type with private component", Actual);
8427 Set_Instance_Of (A_Gen_T, Act_T);
8429 -- If the type is generic, the class-wide type may also be used
8431 if Is_Tagged_Type (A_Gen_T)
8432 and then Is_Tagged_Type (Act_T)
8433 and then not Is_Class_Wide_Type (A_Gen_T)
8435 Set_Instance_Of (Class_Wide_Type (A_Gen_T),
8436 Class_Wide_Type (Act_T));
8439 if not Is_Abstract (A_Gen_T)
8440 and then Is_Abstract (Act_T)
8443 ("actual of non-abstract formal cannot be abstract", Actual);
8446 if Is_Scalar_Type (Gen_T) then
8447 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T));
8452 when N_Formal_Private_Type_Definition =>
8453 Validate_Private_Type_Instance;
8455 when N_Formal_Derived_Type_Definition =>
8456 Validate_Derived_Type_Instance;
8458 when N_Formal_Discrete_Type_Definition =>
8459 if not Is_Discrete_Type (Act_T) then
8461 ("expect discrete type in instantiation of&", Actual, Gen_T);
8462 Abandon_Instantiation (Actual);
8465 when N_Formal_Signed_Integer_Type_Definition =>
8466 if not Is_Signed_Integer_Type (Act_T) then
8468 ("expect signed integer type in instantiation of&",
8470 Abandon_Instantiation (Actual);
8473 when N_Formal_Modular_Type_Definition =>
8474 if not Is_Modular_Integer_Type (Act_T) then
8476 ("expect modular type in instantiation of &", Actual, Gen_T);
8477 Abandon_Instantiation (Actual);
8480 when N_Formal_Floating_Point_Definition =>
8481 if not Is_Floating_Point_Type (Act_T) then
8483 ("expect float type in instantiation of &", Actual, Gen_T);
8484 Abandon_Instantiation (Actual);
8487 when N_Formal_Ordinary_Fixed_Point_Definition =>
8488 if not Is_Ordinary_Fixed_Point_Type (Act_T) then
8490 ("expect ordinary fixed point type in instantiation of &",
8492 Abandon_Instantiation (Actual);
8495 when N_Formal_Decimal_Fixed_Point_Definition =>
8496 if not Is_Decimal_Fixed_Point_Type (Act_T) then
8498 ("expect decimal type in instantiation of &",
8500 Abandon_Instantiation (Actual);
8503 when N_Array_Type_Definition =>
8504 Validate_Array_Type_Instance;
8506 when N_Access_To_Object_Definition =>
8507 Validate_Access_Type_Instance;
8509 when N_Access_Function_Definition |
8510 N_Access_Procedure_Definition =>
8511 Validate_Access_Subprogram_Instance;
8514 raise Program_Error;
8519 Make_Subtype_Declaration (Loc,
8520 Defining_Identifier => New_Copy (Gen_T),
8521 Subtype_Indication => New_Reference_To (Act_T, Loc));
8523 if Is_Private_Type (Act_T) then
8524 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8526 elsif Is_Access_Type (Act_T)
8527 and then Is_Private_Type (Designated_Type (Act_T))
8529 Set_Has_Private_View (Subtype_Indication (Decl_Node));
8532 -- Flag actual derived types so their elaboration produces the
8533 -- appropriate renamings for the primitive operations of the ancestor.
8534 -- Flag actual for formal private types as well, to determine whether
8535 -- operations in the private part may override inherited operations.
8537 if Nkind (Def) = N_Formal_Derived_Type_Definition
8538 or else Nkind (Def) = N_Formal_Private_Type_Definition
8540 Set_Generic_Parent_Type (Decl_Node, Ancestor);
8544 end Instantiate_Type;
8546 ---------------------
8547 -- Is_In_Main_Unit --
8548 ---------------------
8550 function Is_In_Main_Unit (N : Node_Id) return Boolean is
8551 Unum : constant Unit_Number_Type := Get_Source_Unit (N);
8552 Current_Unit : Node_Id;
8555 if Unum = Main_Unit then
8558 -- If the current unit is a subunit then it is either the main unit
8559 -- or is being compiled as part of the main unit.
8561 elsif Nkind (N) = N_Compilation_Unit then
8562 return Nkind (Unit (N)) = N_Subunit;
8565 Current_Unit := Parent (N);
8566 while Present (Current_Unit)
8567 and then Nkind (Current_Unit) /= N_Compilation_Unit
8569 Current_Unit := Parent (Current_Unit);
8572 -- The instantiation node is in the main unit, or else the current
8573 -- node (perhaps as the result of nested instantiations) is in the
8574 -- main unit, or in the declaration of the main unit, which in this
8575 -- last case must be a body.
8577 return Unum = Main_Unit
8578 or else Current_Unit = Cunit (Main_Unit)
8579 or else Current_Unit = Library_Unit (Cunit (Main_Unit))
8580 or else (Present (Library_Unit (Current_Unit))
8581 and then Is_In_Main_Unit (Library_Unit (Current_Unit)));
8582 end Is_In_Main_Unit;
8584 ----------------------------
8585 -- Load_Parent_Of_Generic --
8586 ----------------------------
8588 procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is
8589 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec));
8590 Save_Style_Check : constant Boolean := Style_Check;
8591 True_Parent : Node_Id;
8592 Inst_Node : Node_Id;
8596 if not In_Same_Source_Unit (N, Spec)
8597 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration
8598 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body
8599 and then not Is_In_Main_Unit (Spec))
8601 -- Find body of parent of spec, and analyze it. A special case
8602 -- arises when the parent is an instantiation, that is to say when
8603 -- we are currently instantiating a nested generic. In that case,
8604 -- there is no separate file for the body of the enclosing instance.
8605 -- Instead, the enclosing body must be instantiated as if it were
8606 -- a pending instantiation, in order to produce the body for the
8607 -- nested generic we require now. Note that in that case the
8608 -- generic may be defined in a package body, the instance defined
8609 -- in the same package body, and the original enclosing body may not
8610 -- be in the main unit.
8612 True_Parent := Parent (Spec);
8615 while Present (True_Parent)
8616 and then Nkind (True_Parent) /= N_Compilation_Unit
8618 if Nkind (True_Parent) = N_Package_Declaration
8620 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation
8622 -- Parent is a compilation unit that is an instantiation.
8623 -- Instantiation node has been replaced with package decl.
8625 Inst_Node := Original_Node (True_Parent);
8628 elsif Nkind (True_Parent) = N_Package_Declaration
8629 and then Present (Generic_Parent (Specification (True_Parent)))
8630 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit
8632 -- Parent is an instantiation within another specification.
8633 -- Declaration for instance has been inserted before original
8634 -- instantiation node. A direct link would be preferable?
8636 Inst_Node := Next (True_Parent);
8638 while Present (Inst_Node)
8639 and then Nkind (Inst_Node) /= N_Package_Instantiation
8644 -- If the instance appears within a generic, and the generic
8645 -- unit is defined within a formal package of the enclosing
8646 -- generic, there is no generic body available, and none
8647 -- needed. A more precise test should be used ???
8649 if No (Inst_Node) then
8655 True_Parent := Parent (True_Parent);
8659 -- Case where we are currently instantiating a nested generic
8661 if Present (Inst_Node) then
8662 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then
8664 -- Instantiation node and declaration of instantiated package
8665 -- were exchanged when only the declaration was needed.
8666 -- Restore instantiation node before proceeding with body.
8668 Set_Unit (Parent (True_Parent), Inst_Node);
8671 -- Now complete instantiation of enclosing body, if it appears
8672 -- in some other unit. If it appears in the current unit, the
8673 -- body will have been instantiated already.
8675 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then
8677 -- We need to determine the expander mode to instantiate
8678 -- the enclosing body. Because the generic body we need
8679 -- may use global entities declared in the enclosing package
8680 -- (including aggregates) it is in general necessary to
8681 -- compile this body with expansion enabled. The exception
8682 -- is if we are within a generic package, in which case
8683 -- the usual generic rule applies.
8686 Exp_Status : Boolean := True;
8690 -- Loop through scopes looking for generic package
8692 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node)));
8693 while Present (Scop)
8694 and then Scop /= Standard_Standard
8696 if Ekind (Scop) = E_Generic_Package then
8697 Exp_Status := False;
8701 Scop := Scope (Scop);
8704 Instantiate_Package_Body
8705 (Pending_Body_Info'(
8706 Inst_Node, True_Parent, Exp_Status,
8707 Get_Code_Unit (Sloc (Inst_Node))));
8711 -- Case where we are not instantiating a nested generic
8714 Opt.Style_Check := False;
8715 Expander_Mode_Save_And_Set (True);
8716 Load_Needed_Body (Comp_Unit, OK);
8717 Opt.Style_Check := Save_Style_Check;
8718 Expander_Mode_Restore;
8721 and then Unit_Requires_Body (Defining_Entity (Spec))
8724 Bname : constant Unit_Name_Type :=
8725 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit)));
8728 Error_Msg_Unit_1 := Bname;
8729 Error_Msg_N ("this instantiation requires$!", N);
8731 Get_File_Name (Bname, Subunit => False);
8732 Error_Msg_N ("\but file{ was not found!", N);
8733 raise Unrecoverable_Error;
8739 -- If loading the parent of the generic caused an instantiation
8740 -- circularity, we abandon compilation at this point, because
8741 -- otherwise in some cases we get into trouble with infinite
8742 -- recursions after this point.
8744 if Circularity_Detected then
8745 raise Unrecoverable_Error;
8747 end Load_Parent_Of_Generic;
8749 -----------------------
8750 -- Move_Freeze_Nodes --
8751 -----------------------
8753 procedure Move_Freeze_Nodes
8754 (Out_Of : Entity_Id;
8759 Next_Decl : Node_Id;
8760 Next_Node : Node_Id := After;
8763 function Is_Outer_Type (T : Entity_Id) return Boolean;
8764 -- Check whether entity is declared in a scope external to that
8765 -- of the generic unit.
8771 function Is_Outer_Type (T : Entity_Id) return Boolean is
8772 Scop : Entity_Id := Scope (T);
8775 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then
8779 while Scop /= Standard_Standard loop
8781 if Scop = Out_Of then
8784 Scop := Scope (Scop);
8792 -- Start of processing for Move_Freeze_Nodes
8799 -- First remove the freeze nodes that may appear before all other
8803 while Present (Decl)
8804 and then Nkind (Decl) = N_Freeze_Entity
8805 and then Is_Outer_Type (Entity (Decl))
8807 Decl := Remove_Head (L);
8808 Insert_After (Next_Node, Decl);
8809 Set_Analyzed (Decl, False);
8814 -- Next scan the list of declarations and remove each freeze node that
8815 -- appears ahead of the current node.
8817 while Present (Decl) loop
8818 while Present (Next (Decl))
8819 and then Nkind (Next (Decl)) = N_Freeze_Entity
8820 and then Is_Outer_Type (Entity (Next (Decl)))
8822 Next_Decl := Remove_Next (Decl);
8823 Insert_After (Next_Node, Next_Decl);
8824 Set_Analyzed (Next_Decl, False);
8825 Next_Node := Next_Decl;
8828 -- If the declaration is a nested package or concurrent type, then
8829 -- recurse. Nested generic packages will have been processed from the
8832 if Nkind (Decl) = N_Package_Declaration then
8833 Spec := Specification (Decl);
8835 elsif Nkind (Decl) = N_Task_Type_Declaration then
8836 Spec := Task_Definition (Decl);
8838 elsif Nkind (Decl) = N_Protected_Type_Declaration then
8839 Spec := Protected_Definition (Decl);
8845 if Present (Spec) then
8846 Move_Freeze_Nodes (Out_Of, Next_Node,
8847 Visible_Declarations (Spec));
8848 Move_Freeze_Nodes (Out_Of, Next_Node,
8849 Private_Declarations (Spec));
8854 end Move_Freeze_Nodes;
8860 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is
8862 return Generic_Renamings.Table (E).Next_In_HTable;
8865 ------------------------
8866 -- Preanalyze_Actuals --
8867 ------------------------
8869 procedure Pre_Analyze_Actuals (N : Node_Id) is
8872 Errs : constant Int := Serious_Errors_Detected;
8875 Assoc := First (Generic_Associations (N));
8877 while Present (Assoc) loop
8878 Act := Explicit_Generic_Actual_Parameter (Assoc);
8880 -- Within a nested instantiation, a defaulted actual is an
8881 -- empty association, so nothing to analyze. If the actual for
8882 -- a subprogram is an attribute, analyze prefix only, because
8883 -- actual is not a complete attribute reference.
8885 -- If actual is an allocator, analyze expression only. The full
8886 -- analysis can generate code, and if the instance is a compilation
8887 -- unit we have to wait until the package instance is installed to
8888 -- have a proper place to insert this code.
8890 -- String literals may be operators, but at this point we do not
8891 -- know whether the actual is a formal subprogram or a string.
8896 elsif Nkind (Act) = N_Attribute_Reference then
8897 Analyze (Prefix (Act));
8899 elsif Nkind (Act) = N_Explicit_Dereference then
8900 Analyze (Prefix (Act));
8902 elsif Nkind (Act) = N_Allocator then
8904 Expr : constant Node_Id := Expression (Act);
8907 if Nkind (Expr) = N_Subtype_Indication then
8908 Analyze (Subtype_Mark (Expr));
8909 Analyze_List (Constraints (Constraint (Expr)));
8915 elsif Nkind (Act) /= N_Operator_Symbol then
8919 if Errs /= Serious_Errors_Detected then
8920 Abandon_Instantiation (Act);
8925 end Pre_Analyze_Actuals;
8931 procedure Remove_Parent (In_Body : Boolean := False) is
8932 S : Entity_Id := Current_Scope;
8938 -- After child instantiation is complete, remove from scope stack
8939 -- the extra copy of the current scope, and then remove parent
8945 while Current_Scope /= S loop
8947 End_Package_Scope (Current_Scope);
8949 if In_Open_Scopes (P) then
8950 E := First_Entity (P);
8952 while Present (E) loop
8953 Set_Is_Immediately_Visible (E, True);
8957 if Is_Generic_Instance (Current_Scope)
8958 and then P /= Current_Scope
8960 -- We are within an instance of some sibling. Retain
8961 -- visibility of parent, for proper subsequent cleanup,
8962 -- and reinstall private declarations as well.
8964 Set_In_Private_Part (P);
8965 Install_Private_Declarations (P);
8968 -- This looks incomplete: what about compilation units that
8969 -- were made visible by Install_Parent but should not remain
8970 -- visible??? Standard is on the scope stack.
8972 elsif not In_Open_Scopes (Scope (P)) then
8973 Set_Is_Immediately_Visible (P, False);
8977 -- Reset visibility of entities in the enclosing scope.
8979 Set_Is_Hidden_Open_Scope (Current_Scope, False);
8980 Hidden := First_Elmt (Hidden_Entities);
8982 while Present (Hidden) loop
8983 Set_Is_Immediately_Visible (Node (Hidden), True);
8988 -- Each body is analyzed separately, and there is no context
8989 -- that needs preserving from one body instance to the next,
8990 -- so remove all parent scopes that have been installed.
8992 while Present (S) loop
8993 End_Package_Scope (S);
8994 Set_Is_Immediately_Visible (S, False);
8996 exit when S = Standard_Standard;
9006 procedure Restore_Env is
9007 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last);
9010 Ada_Version := Saved.Ada_Version;
9012 if No (Current_Instantiated_Parent.Act_Id) then
9014 -- Restore environment after subprogram inlining
9016 Restore_Private_Views (Empty);
9019 Current_Instantiated_Parent := Saved.Instantiated_Parent;
9020 Exchanged_Views := Saved.Exchanged_Views;
9021 Hidden_Entities := Saved.Hidden_Entities;
9022 Current_Sem_Unit := Saved.Current_Sem_Unit;
9024 Instance_Envs.Decrement_Last;
9027 ---------------------------
9028 -- Restore_Private_Views --
9029 ---------------------------
9031 procedure Restore_Private_Views
9032 (Pack_Id : Entity_Id;
9033 Is_Package : Boolean := True)
9041 procedure Restore_Nested_Formal (Formal : Entity_Id);
9042 -- Hide the generic formals of formal packages declared with box
9043 -- which were reachable in the current instantiation.
9045 procedure Restore_Nested_Formal (Formal : Entity_Id) is
9048 if Present (Renamed_Object (Formal))
9049 and then Denotes_Formal_Package (Renamed_Object (Formal), True)
9053 elsif Present (Associated_Formal_Package (Formal))
9054 and then Box_Present (Parent (Associated_Formal_Package (Formal)))
9056 Ent := First_Entity (Formal);
9058 while Present (Ent) loop
9059 exit when Ekind (Ent) = E_Package
9060 and then Renamed_Entity (Ent) = Renamed_Entity (Formal);
9062 Set_Is_Hidden (Ent);
9063 Set_Is_Potentially_Use_Visible (Ent, False);
9065 if Ekind (Ent) = E_Package then
9067 Restore_Nested_Formal (Ent);
9073 end Restore_Nested_Formal;
9076 M := First_Elmt (Exchanged_Views);
9077 while Present (M) loop
9080 -- Subtypes of types whose views have been exchanged, and that
9081 -- are defined within the instance, were not on the list of
9082 -- Private_Dependents on entry to the instance, so they have to
9083 -- be exchanged explicitly now, in order to remain consistent with
9084 -- the view of the parent type.
9086 if Ekind (Typ) = E_Private_Type
9087 or else Ekind (Typ) = E_Limited_Private_Type
9088 or else Ekind (Typ) = E_Record_Type_With_Private
9090 Dep_Elmt := First_Elmt (Private_Dependents (Typ));
9092 while Present (Dep_Elmt) loop
9093 Dep_Typ := Node (Dep_Elmt);
9095 if Scope (Dep_Typ) = Pack_Id
9096 and then Present (Full_View (Dep_Typ))
9098 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ));
9099 Exchange_Declarations (Dep_Typ);
9102 Next_Elmt (Dep_Elmt);
9106 Exchange_Declarations (Node (M));
9110 if No (Pack_Id) then
9114 -- Make the generic formal parameters private, and make the formal
9115 -- types into subtypes of the actuals again.
9117 E := First_Entity (Pack_Id);
9119 while Present (E) loop
9120 Set_Is_Hidden (E, True);
9123 and then Nkind (Parent (E)) = N_Subtype_Declaration
9125 Set_Is_Generic_Actual_Type (E, False);
9127 -- An unusual case of aliasing: the actual may also be directly
9128 -- visible in the generic, and be private there, while it is
9129 -- fully visible in the context of the instance. The internal
9130 -- subtype is private in the instance, but has full visibility
9131 -- like its parent in the enclosing scope. This enforces the
9132 -- invariant that the privacy status of all private dependents of
9133 -- a type coincide with that of the parent type. This can only
9134 -- happen when a generic child unit is instantiated within a
9137 if Is_Private_Type (E)
9138 and then not Is_Private_Type (Etype (E))
9140 Exchange_Declarations (E);
9143 elsif Ekind (E) = E_Package then
9145 -- The end of the renaming list is the renaming of the generic
9146 -- package itself. If the instance is a subprogram, all entities
9147 -- in the corresponding package are renamings. If this entity is
9148 -- a formal package, make its own formals private as well. The
9149 -- actual in this case is itself the renaming of an instantation.
9150 -- If the entity is not a package renaming, it is the entity
9151 -- created to validate formal package actuals: ignore.
9153 -- If the actual is itself a formal package for the enclosing
9154 -- generic, or the actual for such a formal package, it remains
9155 -- visible on exit from the instance, and therefore nothing
9156 -- needs to be done either, except to keep it accessible.
9159 and then Renamed_Object (E) = Pack_Id
9163 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then
9166 elsif Denotes_Formal_Package (Renamed_Object (E), True) then
9167 Set_Is_Hidden (E, False);
9171 Act_P : constant Entity_Id := Renamed_Object (E);
9175 Id := First_Entity (Act_P);
9177 and then Id /= First_Private_Entity (Act_P)
9179 exit when Ekind (Id) = E_Package
9180 and then Renamed_Object (Id) = Act_P;
9182 Set_Is_Hidden (Id, True);
9183 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P));
9185 if Ekind (Id) = E_Package then
9186 Restore_Nested_Formal (Id);
9197 end Restore_Private_Views;
9204 (Gen_Unit : Entity_Id;
9205 Act_Unit : Entity_Id)
9209 Set_Instance_Env (Gen_Unit, Act_Unit);
9212 ----------------------------
9213 -- Save_Global_References --
9214 ----------------------------
9216 procedure Save_Global_References (N : Node_Id) is
9217 Gen_Scope : Entity_Id;
9221 function Is_Global (E : Entity_Id) return Boolean;
9222 -- Check whether entity is defined outside of generic unit.
9223 -- Examine the scope of an entity, and the scope of the scope,
9224 -- etc, until we find either Standard, in which case the entity
9225 -- is global, or the generic unit itself, which indicates that
9226 -- the entity is local. If the entity is the generic unit itself,
9227 -- as in the case of a recursive call, or the enclosing generic unit,
9228 -- if different from the current scope, then it is local as well,
9229 -- because it will be replaced at the point of instantiation. On
9230 -- the other hand, if it is a reference to a child unit of a common
9231 -- ancestor, which appears in an instantiation, it is global because
9232 -- it is used to denote a specific compilation unit at the time the
9233 -- instantiations will be analyzed.
9235 procedure Reset_Entity (N : Node_Id);
9236 -- Save semantic information on global entity, so that it is not
9237 -- resolved again at instantiation time.
9239 procedure Save_Entity_Descendants (N : Node_Id);
9240 -- Apply Save_Global_References to the two syntactic descendants of
9241 -- non-terminal nodes that carry an Associated_Node and are processed
9242 -- through Reset_Entity. Once the global entity (if any) has been
9243 -- captured together with its type, only two syntactic descendants
9244 -- need to be traversed to complete the processing of the tree rooted
9245 -- at N. This applies to Selected_Components, Expanded_Names, and to
9246 -- Operator nodes. N can also be a character literal, identifier, or
9247 -- operator symbol node, but the call has no effect in these cases.
9249 procedure Save_Global_Defaults (N1, N2 : Node_Id);
9250 -- Default actuals in nested instances must be handled specially
9251 -- because there is no link to them from the original tree. When an
9252 -- actual subprogram is given by a default, we add an explicit generic
9253 -- association for it in the instantiation node. When we save the
9254 -- global references on the name of the instance, we recover the list
9255 -- of generic associations, and add an explicit one to the original
9256 -- generic tree, through which a global actual can be preserved.
9257 -- Similarly, if a child unit is instantiated within a sibling, in the
9258 -- context of the parent, we must preserve the identifier of the parent
9259 -- so that it can be properly resolved in a subsequent instantiation.
9261 procedure Save_Global_Descendant (D : Union_Id);
9262 -- Apply Save_Global_References recursively to the descendents of
9265 procedure Save_References (N : Node_Id);
9266 -- This is the recursive procedure that does the work, once the
9267 -- enclosing generic scope has been established.
9273 function Is_Global (E : Entity_Id) return Boolean is
9274 Se : Entity_Id := Scope (E);
9276 function Is_Instance_Node (Decl : Node_Id) return Boolean;
9277 -- Determine whether the parent node of a reference to a child unit
9278 -- denotes an instantiation or a formal package, in which case the
9279 -- reference to the child unit is global, even if it appears within
9280 -- the current scope (e.g. when the instance appears within the body
9283 ----------------------
9284 -- Is_Instance_Node --
9285 ----------------------
9287 function Is_Instance_Node (Decl : Node_Id) return Boolean is
9289 return (Nkind (Decl) in N_Generic_Instantiation
9291 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration);
9292 end Is_Instance_Node;
9294 -- Start of processing for Is_Global
9297 if E = Gen_Scope then
9300 elsif E = Standard_Standard then
9303 elsif Is_Child_Unit (E)
9304 and then (Is_Instance_Node (Parent (N2))
9305 or else (Nkind (Parent (N2)) = N_Expanded_Name
9306 and then N2 = Selector_Name (Parent (N2))
9307 and then Is_Instance_Node (Parent (Parent (N2)))))
9312 while Se /= Gen_Scope loop
9313 if Se = Standard_Standard then
9328 procedure Reset_Entity (N : Node_Id) is
9330 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id);
9331 -- The type of N2 is global to the generic unit. Save the
9332 -- type in the generic node.
9334 function Top_Ancestor (E : Entity_Id) return Entity_Id;
9335 -- Find the ultimate ancestor of the current unit. If it is
9336 -- not a generic unit, then the name of the current unit
9337 -- in the prefix of an expanded name must be replaced with
9338 -- its generic homonym to ensure that it will be properly
9339 -- resolved in an instance.
9341 ---------------------
9342 -- Set_Global_Type --
9343 ---------------------
9345 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is
9346 Typ : constant Entity_Id := Etype (N2);
9352 and then Has_Private_View (Entity (N))
9354 -- If the entity of N is not the associated node, this is
9355 -- a nested generic and it has an associated node as well,
9356 -- whose type is already the full view (see below). Indicate
9357 -- that the original node has a private view.
9359 Set_Has_Private_View (N);
9362 -- If not a private type, nothing else to do
9364 if not Is_Private_Type (Typ) then
9365 if Is_Array_Type (Typ)
9366 and then Is_Private_Type (Component_Type (Typ))
9368 Set_Has_Private_View (N);
9371 -- If it is a derivation of a private type in a context where
9372 -- no full view is needed, nothing to do either.
9374 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then
9377 -- Otherwise mark the type for flipping and use the full_view
9381 Set_Has_Private_View (N);
9383 if Present (Full_View (Typ)) then
9384 Set_Etype (N2, Full_View (Typ));
9387 end Set_Global_Type;
9393 function Top_Ancestor (E : Entity_Id) return Entity_Id is
9394 Par : Entity_Id := E;
9397 while Is_Child_Unit (Par) loop
9404 -- Start of processing for Reset_Entity
9407 N2 := Get_Associated_Node (N);
9411 if Is_Global (E) then
9412 Set_Global_Type (N, N2);
9414 elsif Nkind (N) = N_Op_Concat
9415 and then Is_Generic_Type (Etype (N2))
9417 (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2)
9418 or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2))
9419 and then Is_Intrinsic_Subprogram (E)
9424 -- Entity is local. Mark generic node as unresolved.
9425 -- Note that now it does not have an entity.
9427 Set_Associated_Node (N, Empty);
9428 Set_Etype (N, Empty);
9431 if (Nkind (Parent (N)) = N_Package_Instantiation
9432 or else Nkind (Parent (N)) = N_Function_Instantiation
9433 or else Nkind (Parent (N)) = N_Procedure_Instantiation)
9434 and then N = Name (Parent (N))
9436 Save_Global_Defaults (Parent (N), Parent (N2));
9439 elsif Nkind (Parent (N)) = N_Selected_Component
9440 and then Nkind (Parent (N2)) = N_Expanded_Name
9443 if Is_Global (Entity (Parent (N2))) then
9444 Change_Selected_Component_To_Expanded_Name (Parent (N));
9445 Set_Associated_Node (Parent (N), Parent (N2));
9446 Set_Global_Type (Parent (N), Parent (N2));
9447 Save_Entity_Descendants (N);
9449 -- If this is a reference to the current generic entity,
9450 -- replace by the name of the generic homonym of the current
9451 -- package. This is because in an instantiation Par.P.Q will
9452 -- not resolve to the name of the instance, whose enclosing
9453 -- scope is not necessarily Par. We use the generic homonym
9454 -- rather that the name of the generic itself, because it may
9455 -- be hidden by a local declaration.
9457 elsif In_Open_Scopes (Entity (Parent (N2)))
9459 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2)))))
9461 if Ekind (Entity (Parent (N2))) = E_Generic_Package then
9462 Rewrite (Parent (N),
9463 Make_Identifier (Sloc (N),
9465 Chars (Generic_Homonym (Entity (Parent (N2))))));
9467 Rewrite (Parent (N),
9468 Make_Identifier (Sloc (N),
9469 Chars => Chars (Selector_Name (Parent (N2)))));
9473 if (Nkind (Parent (Parent (N))) = N_Package_Instantiation
9474 or else Nkind (Parent (Parent (N)))
9475 = N_Function_Instantiation
9476 or else Nkind (Parent (Parent (N)))
9477 = N_Procedure_Instantiation)
9478 and then Parent (N) = Name (Parent (Parent (N)))
9480 Save_Global_Defaults
9481 (Parent (Parent (N)), Parent (Parent ((N2))));
9484 -- A selected component may denote a static constant that has
9485 -- been folded. Make the same replacement in original tree.
9487 elsif Nkind (Parent (N)) = N_Selected_Component
9488 and then (Nkind (Parent (N2)) = N_Integer_Literal
9489 or else Nkind (Parent (N2)) = N_Real_Literal)
9491 Rewrite (Parent (N),
9492 New_Copy (Parent (N2)));
9493 Set_Analyzed (Parent (N), False);
9495 -- A selected component may be transformed into a parameterless
9496 -- function call. If the called entity is global, rewrite the
9497 -- node appropriately, i.e. as an extended name for the global
9500 elsif Nkind (Parent (N)) = N_Selected_Component
9501 and then Nkind (Parent (N2)) = N_Function_Call
9502 and then Is_Global (Entity (Name (Parent (N2))))
9504 Change_Selected_Component_To_Expanded_Name (Parent (N));
9505 Set_Associated_Node (Parent (N), Name (Parent (N2)));
9506 Set_Global_Type (Parent (N), Name (Parent (N2)));
9507 Save_Entity_Descendants (N);
9510 -- Entity is local. Reset in generic unit, so that node
9511 -- is resolved anew at the point of instantiation.
9513 Set_Associated_Node (N, Empty);
9514 Set_Etype (N, Empty);
9518 -----------------------------
9519 -- Save_Entity_Descendants --
9520 -----------------------------
9522 procedure Save_Entity_Descendants (N : Node_Id) is
9526 Save_Global_Descendant (Union_Id (Left_Opnd (N)));
9527 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9530 Save_Global_Descendant (Union_Id (Right_Opnd (N)));
9532 when N_Expanded_Name | N_Selected_Component =>
9533 Save_Global_Descendant (Union_Id (Prefix (N)));
9534 Save_Global_Descendant (Union_Id (Selector_Name (N)));
9536 when N_Identifier | N_Character_Literal | N_Operator_Symbol =>
9540 raise Program_Error;
9542 end Save_Entity_Descendants;
9544 --------------------------
9545 -- Save_Global_Defaults --
9546 --------------------------
9548 procedure Save_Global_Defaults (N1, N2 : Node_Id) is
9549 Loc : constant Source_Ptr := Sloc (N1);
9550 Assoc2 : constant List_Id := Generic_Associations (N2);
9551 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2);
9561 Assoc1 := Generic_Associations (N1);
9563 if Present (Assoc1) then
9564 Act1 := First (Assoc1);
9567 Set_Generic_Associations (N1, New_List);
9568 Assoc1 := Generic_Associations (N1);
9571 if Present (Assoc2) then
9572 Act2 := First (Assoc2);
9577 while Present (Act1) and then Present (Act2) loop
9582 -- Find the associations added for default suprograms.
9584 if Present (Act2) then
9585 while Nkind (Act2) /= N_Generic_Association
9586 or else No (Entity (Selector_Name (Act2)))
9587 or else not Is_Overloadable (Entity (Selector_Name (Act2)))
9592 -- Add a similar association if the default is global. The
9593 -- renaming declaration for the actual has been analyzed, and
9594 -- its alias is the program it renames. Link the actual in the
9595 -- original generic tree with the node in the analyzed tree.
9597 while Present (Act2) loop
9598 Subp := Entity (Selector_Name (Act2));
9599 Def := Explicit_Generic_Actual_Parameter (Act2);
9601 -- Following test is defence against rubbish errors
9603 if No (Alias (Subp)) then
9607 -- Retrieve the resolved actual from the renaming declaration
9608 -- created for the instantiated formal.
9610 Actual := Entity (Name (Parent (Parent (Subp))));
9611 Set_Entity (Def, Actual);
9612 Set_Etype (Def, Etype (Actual));
9614 if Is_Global (Actual) then
9616 Make_Generic_Association (Loc,
9617 Selector_Name => New_Occurrence_Of (Subp, Loc),
9618 Explicit_Generic_Actual_Parameter =>
9619 New_Occurrence_Of (Actual, Loc));
9622 (Explicit_Generic_Actual_Parameter (Ndec), Def);
9624 Append (Ndec, Assoc1);
9626 -- If there are other defaults, add a dummy association
9627 -- in case there are other defaulted formals with the same
9630 elsif Present (Next (Act2)) then
9632 Make_Generic_Association (Loc,
9633 Selector_Name => New_Occurrence_Of (Subp, Loc),
9634 Explicit_Generic_Actual_Parameter => Empty);
9636 Append (Ndec, Assoc1);
9643 if Nkind (Name (N1)) = N_Identifier
9644 and then Is_Child_Unit (Gen_Id)
9645 and then Is_Global (Gen_Id)
9646 and then Is_Generic_Unit (Scope (Gen_Id))
9647 and then In_Open_Scopes (Scope (Gen_Id))
9649 -- This is an instantiation of a child unit within a sibling,
9650 -- so that the generic parent is in scope. An eventual instance
9651 -- must occur within the scope of an instance of the parent.
9652 -- Make name in instance into an expanded name, to preserve the
9653 -- identifier of the parent, so it can be resolved subsequently.
9656 Make_Expanded_Name (Loc,
9657 Chars => Chars (Gen_Id),
9658 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9659 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9660 Set_Entity (Name (N2), Gen_Id);
9663 Make_Expanded_Name (Loc,
9664 Chars => Chars (Gen_Id),
9665 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc),
9666 Selector_Name => New_Occurrence_Of (Gen_Id, Loc)));
9668 Set_Associated_Node (Name (N1), Name (N2));
9669 Set_Associated_Node (Prefix (Name (N1)), Empty);
9671 (Selector_Name (Name (N1)), Selector_Name (Name (N2)));
9672 Set_Etype (Name (N1), Etype (Gen_Id));
9675 end Save_Global_Defaults;
9677 ----------------------------
9678 -- Save_Global_Descendant --
9679 ----------------------------
9681 procedure Save_Global_Descendant (D : Union_Id) is
9685 if D in Node_Range then
9686 if D = Union_Id (Empty) then
9689 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then
9690 Save_References (Node_Id (D));
9693 elsif D in List_Range then
9694 if D = Union_Id (No_List)
9695 or else Is_Empty_List (List_Id (D))
9700 N1 := First (List_Id (D));
9701 while Present (N1) loop
9702 Save_References (N1);
9707 -- Element list or other non-node field, nothing to do
9712 end Save_Global_Descendant;
9714 ---------------------
9715 -- Save_References --
9716 ---------------------
9718 -- This is the recursive procedure that does the work, once the
9719 -- enclosing generic scope has been established. We have to treat
9720 -- specially a number of node rewritings that are required by semantic
9721 -- processing and which change the kind of nodes in the generic copy:
9722 -- typically constant-folding, replacing an operator node by a string
9723 -- literal, or a selected component by an expanded name. In each of
9724 -- those cases, the transformation is propagated to the generic unit.
9726 procedure Save_References (N : Node_Id) is
9731 elsif Nkind (N) = N_Character_Literal
9732 or else Nkind (N) = N_Operator_Symbol
9734 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9737 elsif Nkind (N) = N_Operator_Symbol
9738 and then Nkind (Get_Associated_Node (N)) = N_String_Literal
9740 Change_Operator_Symbol_To_String_Literal (N);
9743 elsif Nkind (N) in N_Op then
9745 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9747 if Nkind (N) = N_Op_Concat then
9748 Set_Is_Component_Left_Opnd (N,
9749 Is_Component_Left_Opnd (Get_Associated_Node (N)));
9751 Set_Is_Component_Right_Opnd (N,
9752 Is_Component_Right_Opnd (Get_Associated_Node (N)));
9757 -- Node may be transformed into call to a user-defined operator
9759 N2 := Get_Associated_Node (N);
9761 if Nkind (N2) = N_Function_Call then
9762 E := Entity (Name (N2));
9765 and then Is_Global (E)
9767 Set_Etype (N, Etype (N2));
9769 Set_Associated_Node (N, Empty);
9770 Set_Etype (N, Empty);
9773 elsif Nkind (N2) = N_Integer_Literal
9774 or else Nkind (N2) = N_Real_Literal
9775 or else Nkind (N2) = N_String_Literal
9777 -- Operation was constant-folded, perform the same
9778 -- replacement in generic.
9780 Rewrite (N, New_Copy (N2));
9781 Set_Analyzed (N, False);
9783 elsif Nkind (N2) = N_Identifier
9784 and then Ekind (Entity (N2)) = E_Enumeration_Literal
9786 -- Same if call was folded into a literal, but in this
9787 -- case retain the entity to avoid spurious ambiguities
9788 -- if id is overloaded at the point of instantiation or
9791 Rewrite (N, New_Copy (N2));
9792 Set_Analyzed (N, False);
9796 -- Complete the check on operands, if node has not been
9799 if Nkind (N) in N_Op then
9800 Save_Entity_Descendants (N);
9803 elsif Nkind (N) = N_Identifier then
9804 if Nkind (N) = Nkind (Get_Associated_Node (N)) then
9806 -- If this is a discriminant reference, always save it.
9807 -- It is used in the instance to find the corresponding
9808 -- discriminant positionally rather than by name.
9810 Set_Original_Discriminant
9811 (N, Original_Discriminant (Get_Associated_Node (N)));
9815 N2 := Get_Associated_Node (N);
9817 if Nkind (N2) = N_Function_Call then
9818 E := Entity (Name (N2));
9820 -- Name resolves to a call to parameterless function.
9821 -- If original entity is global, mark node as resolved.
9824 and then Is_Global (E)
9826 Set_Etype (N, Etype (N2));
9828 Set_Associated_Node (N, Empty);
9829 Set_Etype (N, Empty);
9833 Nkind (N2) = N_Integer_Literal or else
9834 Nkind (N2) = N_Real_Literal or else
9835 Nkind (N2) = N_String_Literal
9837 -- Name resolves to named number that is constant-folded,
9838 -- or to string literal from concatenation.
9839 -- Perform the same replacement in generic.
9841 Rewrite (N, New_Copy (N2));
9842 Set_Analyzed (N, False);
9844 elsif Nkind (N2) = N_Explicit_Dereference then
9846 -- An identifier is rewritten as a dereference if it is
9847 -- the prefix in a selected component, and it denotes an
9848 -- access to a composite type, or a parameterless function
9849 -- call that returns an access type.
9851 -- Check whether corresponding entity in prefix is global.
9853 if Is_Entity_Name (Prefix (N2))
9854 and then Present (Entity (Prefix (N2)))
9855 and then Is_Global (Entity (Prefix (N2)))
9858 Make_Explicit_Dereference (Sloc (N),
9859 Prefix => Make_Identifier (Sloc (N),
9860 Chars => Chars (N))));
9861 Set_Associated_Node (Prefix (N), Prefix (N2));
9863 elsif Nkind (Prefix (N2)) = N_Function_Call
9864 and then Is_Global (Entity (Name (Prefix (N2))))
9867 Make_Explicit_Dereference (Sloc (N),
9868 Prefix => Make_Function_Call (Sloc (N),
9870 Make_Identifier (Sloc (N),
9871 Chars => Chars (N)))));
9874 (Name (Prefix (N)), Name (Prefix (N2)));
9877 Set_Associated_Node (N, Empty);
9878 Set_Etype (N, Empty);
9881 -- The subtype mark of a nominally unconstrained object
9882 -- is rewritten as a subtype indication using the bounds
9883 -- of the expression. Recover the original subtype mark.
9885 elsif Nkind (N2) = N_Subtype_Indication
9886 and then Is_Entity_Name (Original_Node (N2))
9888 Set_Associated_Node (N, Original_Node (N2));
9896 elsif Nkind (N) in N_Entity then
9901 use Atree.Unchecked_Access;
9902 -- This code section is part of implementing an untyped tree
9903 -- traversal, so it needs direct access to node fields.
9906 if Nkind (N) = N_Aggregate
9908 Nkind (N) = N_Extension_Aggregate
9910 N2 := Get_Associated_Node (N);
9913 or else No (Etype (N2))
9914 or else not Is_Global (Etype (N2))
9916 Set_Associated_Node (N, Empty);
9919 Save_Global_Descendant (Field1 (N));
9920 Save_Global_Descendant (Field2 (N));
9921 Save_Global_Descendant (Field3 (N));
9922 Save_Global_Descendant (Field5 (N));
9924 -- All other cases than aggregates
9927 Save_Global_Descendant (Field1 (N));
9928 Save_Global_Descendant (Field2 (N));
9929 Save_Global_Descendant (Field3 (N));
9930 Save_Global_Descendant (Field4 (N));
9931 Save_Global_Descendant (Field5 (N));
9935 end Save_References;
9937 -- Start of processing for Save_Global_References
9940 Gen_Scope := Current_Scope;
9942 -- If the generic unit is a child unit, references to entities in
9943 -- the parent are treated as local, because they will be resolved
9944 -- anew in the context of the instance of the parent.
9946 while Is_Child_Unit (Gen_Scope)
9947 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package
9949 Gen_Scope := Scope (Gen_Scope);
9952 Save_References (N);
9953 end Save_Global_References;
9955 --------------------------------------
9956 -- Set_Copied_Sloc_For_Inlined_Body --
9957 --------------------------------------
9959 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is
9961 Create_Instantiation_Source (N, E, True, S_Adjustment);
9962 end Set_Copied_Sloc_For_Inlined_Body;
9964 ---------------------
9965 -- Set_Instance_Of --
9966 ---------------------
9968 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is
9970 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null);
9971 Generic_Renamings_HTable.Set (Generic_Renamings.Last);
9972 Generic_Renamings.Increment_Last;
9973 end Set_Instance_Of;
9975 --------------------
9976 -- Set_Next_Assoc --
9977 --------------------
9979 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is
9981 Generic_Renamings.Table (E).Next_In_HTable := Next;
9988 procedure Start_Generic is
9990 -- ??? I am sure more things could be factored out in this
9991 -- routine. Should probably be done at a later stage.
9993 Generic_Flags.Increment_Last;
9994 Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic;
9995 Inside_A_Generic := True;
9997 Expander_Mode_Save_And_Set (False);
10000 ----------------------
10001 -- Set_Instance_Env --
10002 ----------------------
10004 procedure Set_Instance_Env
10005 (Gen_Unit : Entity_Id;
10006 Act_Unit : Entity_Id)
10010 -- Regardless of the current mode, predefined units are analyzed in
10011 -- the most current Ada mode, and earlier version Ada checks do not
10012 -- apply to predefined units.
10014 if Is_Internal_File_Name
10015 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)),
10016 Renamings_Included => True) then
10017 Ada_Version := Ada_Version_Type'Last;
10020 Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null);
10021 end Set_Instance_Env;
10027 procedure Switch_View (T : Entity_Id) is
10028 BT : constant Entity_Id := Base_Type (T);
10029 Priv_Elmt : Elmt_Id := No_Elmt;
10030 Priv_Sub : Entity_Id;
10033 -- T may be private but its base type may have been exchanged through
10034 -- some other occurrence, in which case there is nothing to switch.
10036 if not Is_Private_Type (BT) then
10040 Priv_Elmt := First_Elmt (Private_Dependents (BT));
10042 if Present (Full_View (BT)) then
10043 Append_Elmt (Full_View (BT), Exchanged_Views);
10044 Exchange_Declarations (BT);
10047 while Present (Priv_Elmt) loop
10048 Priv_Sub := (Node (Priv_Elmt));
10050 -- We avoid flipping the subtype if the Etype of its full
10051 -- view is private because this would result in a malformed
10052 -- subtype. This occurs when the Etype of the subtype full
10053 -- view is the full view of the base type (and since the
10054 -- base types were just switched, the subtype is pointing
10055 -- to the wrong view). This is currently the case for
10056 -- tagged record types, access types (maybe more?) and
10057 -- needs to be resolved. ???
10059 if Present (Full_View (Priv_Sub))
10060 and then not Is_Private_Type (Etype (Full_View (Priv_Sub)))
10062 Append_Elmt (Full_View (Priv_Sub), Exchanged_Views);
10063 Exchange_Declarations (Priv_Sub);
10066 Next_Elmt (Priv_Elmt);
10070 -----------------------------
10071 -- Valid_Default_Attribute --
10072 -----------------------------
10074 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is
10075 Attr_Id : constant Attribute_Id :=
10076 Get_Attribute_Id (Attribute_Name (Def));
10077 T : constant Entity_Id := Entity (Prefix (Def));
10078 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function);
10091 F := First_Formal (Nam);
10092 while Present (F) loop
10093 Num_F := Num_F + 1;
10098 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign |
10099 Attribute_Floor | Attribute_Fraction | Attribute_Machine |
10100 Attribute_Model | Attribute_Remainder | Attribute_Rounding |
10101 Attribute_Unbiased_Rounding =>
10104 and then Is_Floating_Point_Type (T);
10106 when Attribute_Image | Attribute_Pred | Attribute_Succ |
10107 Attribute_Value | Attribute_Wide_Image |
10108 Attribute_Wide_Value =>
10109 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T));
10111 when Attribute_Max | Attribute_Min =>
10112 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T));
10114 when Attribute_Input =>
10115 OK := (Is_Fun and then Num_F = 1);
10117 when Attribute_Output | Attribute_Read | Attribute_Write =>
10118 OK := (not Is_Fun and then Num_F = 2);
10125 Error_Msg_N ("attribute reference has wrong profile for subprogram",
10128 end Valid_Default_Attribute;
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