1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, 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 3, 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. --
18 -- You should have received a copy of the GNU General Public License along --
19 -- with this program; see file COPYING3. If not see --
20 -- <http://www.gnu.org/licenses/>. --
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 Debug; use Debug;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Exp_Ch3; use Exp_Ch3;
33 with Exp_Ch7; use Exp_Ch7;
34 with Exp_Disp; use Exp_Disp;
35 with Exp_Pakd; use Exp_Pakd;
36 with Exp_Util; use Exp_Util;
37 with Exp_Tss; use Exp_Tss;
38 with Layout; use Layout;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
42 with Nmake; use Nmake;
44 with Restrict; use Restrict;
45 with Rident; use Rident;
47 with Sem_Aux; use Sem_Aux;
48 with Sem_Cat; use Sem_Cat;
49 with Sem_Ch6; use Sem_Ch6;
50 with Sem_Ch7; use Sem_Ch7;
51 with Sem_Ch8; use Sem_Ch8;
52 with Sem_Ch13; use Sem_Ch13;
53 with Sem_Eval; use Sem_Eval;
54 with Sem_Mech; use Sem_Mech;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Res; use Sem_Res;
57 with Sem_Util; use Sem_Util;
58 with Sinfo; use Sinfo;
59 with Snames; use Snames;
60 with Stand; use Stand;
61 with Targparm; use Targparm;
62 with Tbuild; use Tbuild;
63 with Ttypes; use Ttypes;
64 with Uintp; use Uintp;
65 with Urealp; use Urealp;
67 package body Freeze is
69 -----------------------
70 -- Local Subprograms --
71 -----------------------
73 procedure Adjust_Esize_For_Alignment (Typ : Entity_Id);
74 -- Typ is a type that is being frozen. If no size clause is given,
75 -- but a default Esize has been computed, then this default Esize is
76 -- adjusted up if necessary to be consistent with a given alignment,
77 -- but never to a value greater than Long_Long_Integer'Size. This
78 -- is used for all discrete types and for fixed-point types.
80 procedure Build_And_Analyze_Renamed_Body
83 After : in out Node_Id);
84 -- Build body for a renaming declaration, insert in tree and analyze
86 procedure Check_Address_Clause (E : Entity_Id);
87 -- Apply legality checks to address clauses for object declarations,
88 -- at the point the object is frozen.
90 procedure Check_Strict_Alignment (E : Entity_Id);
91 -- E is a base type. If E is tagged or has a component that is aliased
92 -- or tagged or contains something this is aliased or tagged, set
95 procedure Check_Unsigned_Type (E : Entity_Id);
96 pragma Inline (Check_Unsigned_Type);
97 -- If E is a fixed-point or discrete type, then all the necessary work
98 -- to freeze it is completed except for possible setting of the flag
99 -- Is_Unsigned_Type, which is done by this procedure. The call has no
100 -- effect if the entity E is not a discrete or fixed-point type.
102 procedure Freeze_And_Append
105 Result : in out List_Id);
106 -- Freezes Ent using Freeze_Entity, and appends the resulting list of
107 -- nodes to Result, modifying Result from No_List if necessary. N has
108 -- the same usage as in Freeze_Entity.
110 procedure Freeze_Enumeration_Type (Typ : Entity_Id);
111 -- Freeze enumeration type. The Esize field is set as processing
112 -- proceeds (i.e. set by default when the type is declared and then
113 -- adjusted by rep clauses. What this procedure does is to make sure
114 -- that if a foreign convention is specified, and no specific size
115 -- is given, then the size must be at least Integer'Size.
117 procedure Freeze_Static_Object (E : Entity_Id);
118 -- If an object is frozen which has Is_Statically_Allocated set, then
119 -- all referenced types must also be marked with this flag. This routine
120 -- is in charge of meeting this requirement for the object entity E.
122 procedure Freeze_Subprogram (E : Entity_Id);
123 -- Perform freezing actions for a subprogram (create extra formals,
124 -- and set proper default mechanism values). Note that this routine
125 -- is not called for internal subprograms, for which neither of these
126 -- actions is needed (or desirable, we do not want for example to have
127 -- these extra formals present in initialization procedures, where they
128 -- would serve no purpose). In this call E is either a subprogram or
129 -- a subprogram type (i.e. an access to a subprogram).
131 function Is_Fully_Defined (T : Entity_Id) return Boolean;
132 -- True if T is not private and has no private components, or has a full
133 -- view. Used to determine whether the designated type of an access type
134 -- should be frozen when the access type is frozen. This is done when an
135 -- allocator is frozen, or an expression that may involve attributes of
136 -- the designated type. Otherwise freezing the access type does not freeze
137 -- the designated type.
139 procedure Process_Default_Expressions
141 After : in out Node_Id);
142 -- This procedure is called for each subprogram to complete processing of
143 -- default expressions at the point where all types are known to be frozen.
144 -- The expressions must be analyzed in full, to make sure that all error
145 -- processing is done (they have only been pre-analyzed). If the expression
146 -- is not an entity or literal, its analysis may generate code which must
147 -- not be executed. In that case we build a function body to hold that
148 -- code. This wrapper function serves no other purpose (it used to be
149 -- called to evaluate the default, but now the default is inlined at each
152 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id);
153 -- Typ is a record or array type that is being frozen. This routine sets
154 -- the default component alignment from the scope stack values if the
155 -- alignment is otherwise not specified.
157 procedure Check_Debug_Info_Needed (T : Entity_Id);
158 -- As each entity is frozen, this routine is called to deal with the
159 -- setting of Debug_Info_Needed for the entity. This flag is set if
160 -- the entity comes from source, or if we are in Debug_Generated_Code
161 -- mode or if the -gnatdV debug flag is set. However, it never sets
162 -- the flag if Debug_Info_Off is set. This procedure also ensures that
163 -- subsidiary entities have the flag set as required.
165 procedure Undelay_Type (T : Entity_Id);
166 -- T is a type of a component that we know to be an Itype. We don't want
167 -- this to have a Freeze_Node, so ensure it doesn't. Do the same for any
168 -- Full_View or Corresponding_Record_Type.
170 procedure Warn_Overlay
174 -- Expr is the expression for an address clause for entity Nam whose type
175 -- is Typ. If Typ has a default initialization, and there is no explicit
176 -- initialization in the source declaration, check whether the address
177 -- clause might cause overlaying of an entity, and emit a warning on the
178 -- side effect that the initialization will cause.
180 -------------------------------
181 -- Adjust_Esize_For_Alignment --
182 -------------------------------
184 procedure Adjust_Esize_For_Alignment (Typ : Entity_Id) is
188 if Known_Esize (Typ) and then Known_Alignment (Typ) then
189 Align := Alignment_In_Bits (Typ);
191 if Align > Esize (Typ)
192 and then Align <= Standard_Long_Long_Integer_Size
194 Set_Esize (Typ, Align);
197 end Adjust_Esize_For_Alignment;
199 ------------------------------------
200 -- Build_And_Analyze_Renamed_Body --
201 ------------------------------------
203 procedure Build_And_Analyze_Renamed_Body
206 After : in out Node_Id)
208 Body_Decl : constant Node_Id := Unit_Declaration_Node (New_S);
209 Ent : constant Entity_Id := Defining_Entity (Decl);
211 Renamed_Subp : Entity_Id;
214 -- If the renamed subprogram is intrinsic, there is no need for a
215 -- wrapper body: we set the alias that will be called and expanded which
216 -- completes the declaration. This transformation is only legal if the
217 -- renamed entity has already been elaborated.
219 -- Note that it is legal for a renaming_as_body to rename an intrinsic
220 -- subprogram, as long as the renaming occurs before the new entity
221 -- is frozen. See RM 8.5.4 (5).
223 if Nkind (Body_Decl) = N_Subprogram_Renaming_Declaration
224 and then Is_Entity_Name (Name (Body_Decl))
226 Renamed_Subp := Entity (Name (Body_Decl));
228 Renamed_Subp := Empty;
231 if Present (Renamed_Subp)
232 and then Is_Intrinsic_Subprogram (Renamed_Subp)
234 (not In_Same_Source_Unit (Renamed_Subp, Ent)
235 or else Sloc (Renamed_Subp) < Sloc (Ent))
237 -- We can make the renaming entity intrinsic if the renamed function
238 -- has an interface name, or if it is one of the shift/rotate
239 -- operations known to the compiler.
241 and then (Present (Interface_Name (Renamed_Subp))
242 or else Chars (Renamed_Subp) = Name_Rotate_Left
243 or else Chars (Renamed_Subp) = Name_Rotate_Right
244 or else Chars (Renamed_Subp) = Name_Shift_Left
245 or else Chars (Renamed_Subp) = Name_Shift_Right
246 or else Chars (Renamed_Subp) = Name_Shift_Right_Arithmetic)
248 Set_Interface_Name (Ent, Interface_Name (Renamed_Subp));
250 if Present (Alias (Renamed_Subp)) then
251 Set_Alias (Ent, Alias (Renamed_Subp));
253 Set_Alias (Ent, Renamed_Subp);
256 Set_Is_Intrinsic_Subprogram (Ent);
257 Set_Has_Completion (Ent);
260 Body_Node := Build_Renamed_Body (Decl, New_S);
261 Insert_After (After, Body_Node);
262 Mark_Rewrite_Insertion (Body_Node);
266 end Build_And_Analyze_Renamed_Body;
268 ------------------------
269 -- Build_Renamed_Body --
270 ------------------------
272 function Build_Renamed_Body
274 New_S : Entity_Id) return Node_Id
276 Loc : constant Source_Ptr := Sloc (New_S);
277 -- We use for the source location of the renamed body, the location of
278 -- the spec entity. It might seem more natural to use the location of
279 -- the renaming declaration itself, but that would be wrong, since then
280 -- the body we create would look as though it was created far too late,
281 -- and this could cause problems with elaboration order analysis,
282 -- particularly in connection with instantiations.
284 N : constant Node_Id := Unit_Declaration_Node (New_S);
285 Nam : constant Node_Id := Name (N);
287 Spec : constant Node_Id := New_Copy_Tree (Specification (Decl));
288 Actuals : List_Id := No_List;
293 O_Formal : Entity_Id;
294 Param_Spec : Node_Id;
296 Pref : Node_Id := Empty;
297 -- If the renamed entity is a primitive operation given in prefix form,
298 -- the prefix is the target object and it has to be added as the first
299 -- actual in the generated call.
302 -- Determine the entity being renamed, which is the target of the call
303 -- statement. If the name is an explicit dereference, this is a renaming
304 -- of a subprogram type rather than a subprogram. The name itself is
307 if Nkind (Nam) = N_Selected_Component then
308 Old_S := Entity (Selector_Name (Nam));
310 elsif Nkind (Nam) = N_Explicit_Dereference then
311 Old_S := Etype (Nam);
313 elsif Nkind (Nam) = N_Indexed_Component then
314 if Is_Entity_Name (Prefix (Nam)) then
315 Old_S := Entity (Prefix (Nam));
317 Old_S := Entity (Selector_Name (Prefix (Nam)));
320 elsif Nkind (Nam) = N_Character_Literal then
321 Old_S := Etype (New_S);
324 Old_S := Entity (Nam);
327 if Is_Entity_Name (Nam) then
329 -- If the renamed entity is a predefined operator, retain full name
330 -- to ensure its visibility.
332 if Ekind (Old_S) = E_Operator
333 and then Nkind (Nam) = N_Expanded_Name
335 Call_Name := New_Copy (Name (N));
337 Call_Name := New_Reference_To (Old_S, Loc);
341 if Nkind (Nam) = N_Selected_Component
342 and then Present (First_Formal (Old_S))
344 (Is_Controlling_Formal (First_Formal (Old_S))
345 or else Is_Class_Wide_Type (Etype (First_Formal (Old_S))))
348 -- Retrieve the target object, to be added as a first actual
351 Call_Name := New_Occurrence_Of (Old_S, Loc);
352 Pref := Prefix (Nam);
355 Call_Name := New_Copy (Name (N));
358 -- Original name may have been overloaded, but is fully resolved now
360 Set_Is_Overloaded (Call_Name, False);
363 -- For simple renamings, subsequent calls can be expanded directly as
364 -- calls to the renamed entity. The body must be generated in any case
365 -- for calls that may appear elsewhere.
367 if Ekind_In (Old_S, E_Function, E_Procedure)
368 and then Nkind (Decl) = N_Subprogram_Declaration
370 Set_Body_To_Inline (Decl, Old_S);
373 -- The body generated for this renaming is an internal artifact, and
374 -- does not constitute a freeze point for the called entity.
376 Set_Must_Not_Freeze (Call_Name);
378 Formal := First_Formal (Defining_Entity (Decl));
380 if Present (Pref) then
382 Pref_Type : constant Entity_Id := Etype (Pref);
383 Form_Type : constant Entity_Id := Etype (First_Formal (Old_S));
386 -- The controlling formal may be an access parameter, or the
387 -- actual may be an access value, so adjust accordingly.
389 if Is_Access_Type (Pref_Type)
390 and then not Is_Access_Type (Form_Type)
393 (Make_Explicit_Dereference (Loc, Relocate_Node (Pref)));
395 elsif Is_Access_Type (Form_Type)
396 and then not Is_Access_Type (Pref)
399 (Make_Attribute_Reference (Loc,
400 Attribute_Name => Name_Access,
401 Prefix => Relocate_Node (Pref)));
403 Actuals := New_List (Pref);
407 elsif Present (Formal) then
414 if Present (Formal) then
415 while Present (Formal) loop
416 Append (New_Reference_To (Formal, Loc), Actuals);
417 Next_Formal (Formal);
421 -- If the renamed entity is an entry, inherit its profile. For other
422 -- renamings as bodies, both profiles must be subtype conformant, so it
423 -- is not necessary to replace the profile given in the declaration.
424 -- However, default values that are aggregates are rewritten when
425 -- partially analyzed, so we recover the original aggregate to insure
426 -- that subsequent conformity checking works. Similarly, if the default
427 -- expression was constant-folded, recover the original expression.
429 Formal := First_Formal (Defining_Entity (Decl));
431 if Present (Formal) then
432 O_Formal := First_Formal (Old_S);
433 Param_Spec := First (Parameter_Specifications (Spec));
434 while Present (Formal) loop
435 if Is_Entry (Old_S) then
436 if Nkind (Parameter_Type (Param_Spec)) /=
439 Set_Etype (Formal, Etype (O_Formal));
440 Set_Entity (Parameter_Type (Param_Spec), Etype (O_Formal));
443 elsif Nkind (Default_Value (O_Formal)) = N_Aggregate
444 or else Nkind (Original_Node (Default_Value (O_Formal))) /=
445 Nkind (Default_Value (O_Formal))
447 Set_Expression (Param_Spec,
448 New_Copy_Tree (Original_Node (Default_Value (O_Formal))));
451 Next_Formal (Formal);
452 Next_Formal (O_Formal);
457 -- If the renamed entity is a function, the generated body contains a
458 -- return statement. Otherwise, build a procedure call. If the entity is
459 -- an entry, subsequent analysis of the call will transform it into the
460 -- proper entry or protected operation call. If the renamed entity is
461 -- a character literal, return it directly.
463 if Ekind (Old_S) = E_Function
464 or else Ekind (Old_S) = E_Operator
465 or else (Ekind (Old_S) = E_Subprogram_Type
466 and then Etype (Old_S) /= Standard_Void_Type)
469 Make_Simple_Return_Statement (Loc,
471 Make_Function_Call (Loc,
473 Parameter_Associations => Actuals));
475 elsif Ekind (Old_S) = E_Enumeration_Literal then
477 Make_Simple_Return_Statement (Loc,
478 Expression => New_Occurrence_Of (Old_S, Loc));
480 elsif Nkind (Nam) = N_Character_Literal then
482 Make_Simple_Return_Statement (Loc,
483 Expression => Call_Name);
487 Make_Procedure_Call_Statement (Loc,
489 Parameter_Associations => Actuals);
492 -- Create entities for subprogram body and formals
494 Set_Defining_Unit_Name (Spec,
495 Make_Defining_Identifier (Loc, Chars => Chars (New_S)));
497 Param_Spec := First (Parameter_Specifications (Spec));
498 while Present (Param_Spec) loop
499 Set_Defining_Identifier (Param_Spec,
500 Make_Defining_Identifier (Loc,
501 Chars => Chars (Defining_Identifier (Param_Spec))));
506 Make_Subprogram_Body (Loc,
507 Specification => Spec,
508 Declarations => New_List,
509 Handled_Statement_Sequence =>
510 Make_Handled_Sequence_Of_Statements (Loc,
511 Statements => New_List (Call_Node)));
513 if Nkind (Decl) /= N_Subprogram_Declaration then
515 Make_Subprogram_Declaration (Loc,
516 Specification => Specification (N)));
519 -- Link the body to the entity whose declaration it completes. If
520 -- the body is analyzed when the renamed entity is frozen, it may
521 -- be necessary to restore the proper scope (see package Exp_Ch13).
523 if Nkind (N) = N_Subprogram_Renaming_Declaration
524 and then Present (Corresponding_Spec (N))
526 Set_Corresponding_Spec (Body_Node, Corresponding_Spec (N));
528 Set_Corresponding_Spec (Body_Node, New_S);
532 end Build_Renamed_Body;
534 --------------------------
535 -- Check_Address_Clause --
536 --------------------------
538 procedure Check_Address_Clause (E : Entity_Id) is
539 Addr : constant Node_Id := Address_Clause (E);
541 Decl : constant Node_Id := Declaration_Node (E);
542 Typ : constant Entity_Id := Etype (E);
545 if Present (Addr) then
546 Expr := Expression (Addr);
548 if Needs_Constant_Address (Decl, Typ) then
549 Check_Constant_Address_Clause (Expr, E);
551 -- Has_Delayed_Freeze was set on E when the address clause was
552 -- analyzed. Reset the flag now unless freeze actions were
553 -- attached to it in the mean time.
555 if No (Freeze_Node (E)) then
556 Set_Has_Delayed_Freeze (E, False);
560 -- If Rep_Clauses are to be ignored, remove address clause from
561 -- list attached to entity, because it may be illegal for gigi,
562 -- for example by breaking order of elaboration..
564 if Ignore_Rep_Clauses then
569 Rep := First_Rep_Item (E);
572 Set_First_Rep_Item (E, Next_Rep_Item (Addr));
576 and then Next_Rep_Item (Rep) /= Addr
578 Rep := Next_Rep_Item (Rep);
582 if Present (Rep) then
583 Set_Next_Rep_Item (Rep, Next_Rep_Item (Addr));
587 Rewrite (Addr, Make_Null_Statement (Sloc (E)));
589 elsif not Error_Posted (Expr)
590 and then not Needs_Finalization (Typ)
592 Warn_Overlay (Expr, Typ, Name (Addr));
595 end Check_Address_Clause;
597 -----------------------------
598 -- Check_Compile_Time_Size --
599 -----------------------------
601 procedure Check_Compile_Time_Size (T : Entity_Id) is
603 procedure Set_Small_Size (T : Entity_Id; S : Uint);
604 -- Sets the compile time known size (32 bits or less) in the Esize
605 -- field, of T checking for a size clause that was given which attempts
606 -- to give a smaller size, and also checking for an alignment clause.
608 function Size_Known (T : Entity_Id) return Boolean;
609 -- Recursive function that does all the work
611 function Static_Discriminated_Components (T : Entity_Id) return Boolean;
612 -- If T is a constrained subtype, its size is not known if any of its
613 -- discriminant constraints is not static and it is not a null record.
614 -- The test is conservative and doesn't check that the components are
615 -- in fact constrained by non-static discriminant values. Could be made
622 procedure Set_Small_Size (T : Entity_Id; S : Uint) is
627 -- Don't bother if alignment clause with a value other than 1 is
628 -- present, because size may be padded up to meet back end alignment
629 -- requirements, and only the back end knows the rules!
631 elsif Known_Alignment (T) and then Alignment (T) /= 1 then
634 -- Check for bad size clause given
636 elsif Has_Size_Clause (T) then
637 if RM_Size (T) < S then
638 Error_Msg_Uint_1 := S;
640 ("size for& too small, minimum allowed is ^",
643 elsif Unknown_Esize (T) then
647 -- Set sizes if not set already
650 if Unknown_Esize (T) then
654 if Unknown_RM_Size (T) then
664 function Size_Known (T : Entity_Id) return Boolean is
672 if Size_Known_At_Compile_Time (T) then
675 -- Always True for scalar types. This is true even for generic formal
676 -- scalar types. We used to return False in the latter case, but the
677 -- size is known at compile time, even in the template, we just do
678 -- not know the exact size but that's not the point of this routine.
680 elsif Is_Scalar_Type (T)
681 or else Is_Task_Type (T)
687 elsif Is_Array_Type (T) then
689 -- String literals always have known size, and we can set it
691 if Ekind (T) = E_String_Literal_Subtype then
692 Set_Small_Size (T, Component_Size (T)
693 * String_Literal_Length (T));
696 -- Unconstrained types never have known at compile time size
698 elsif not Is_Constrained (T) then
701 -- Don't do any recursion on type with error posted, since we may
702 -- have a malformed type that leads us into a loop.
704 elsif Error_Posted (T) then
707 -- Otherwise if component size unknown, then array size unknown
709 elsif not Size_Known (Component_Type (T)) then
713 -- Check for all indexes static, and also compute possible size
714 -- (in case it is less than 32 and may be packable).
717 Esiz : Uint := Component_Size (T);
721 Index := First_Index (T);
722 while Present (Index) loop
723 if Nkind (Index) = N_Range then
724 Get_Index_Bounds (Index, Low, High);
726 elsif Error_Posted (Scalar_Range (Etype (Index))) then
730 Low := Type_Low_Bound (Etype (Index));
731 High := Type_High_Bound (Etype (Index));
734 if not Compile_Time_Known_Value (Low)
735 or else not Compile_Time_Known_Value (High)
736 or else Etype (Index) = Any_Type
741 Dim := Expr_Value (High) - Expr_Value (Low) + 1;
753 Set_Small_Size (T, Esiz);
757 -- Access types always have known at compile time sizes
759 elsif Is_Access_Type (T) then
762 -- For non-generic private types, go to underlying type if present
764 elsif Is_Private_Type (T)
765 and then not Is_Generic_Type (T)
766 and then Present (Underlying_Type (T))
768 -- Don't do any recursion on type with error posted, since we may
769 -- have a malformed type that leads us into a loop.
771 if Error_Posted (T) then
774 return Size_Known (Underlying_Type (T));
779 elsif Is_Record_Type (T) then
781 -- A class-wide type is never considered to have a known size
783 if Is_Class_Wide_Type (T) then
786 -- A subtype of a variant record must not have non-static
787 -- discriminated components.
789 elsif T /= Base_Type (T)
790 and then not Static_Discriminated_Components (T)
794 -- Don't do any recursion on type with error posted, since we may
795 -- have a malformed type that leads us into a loop.
797 elsif Error_Posted (T) then
801 -- Now look at the components of the record
804 -- The following two variables are used to keep track of the
805 -- size of packed records if we can tell the size of the packed
806 -- record in the front end. Packed_Size_Known is True if so far
807 -- we can figure out the size. It is initialized to True for a
808 -- packed record, unless the record has discriminants. The
809 -- reason we eliminate the discriminated case is that we don't
810 -- know the way the back end lays out discriminated packed
811 -- records. If Packed_Size_Known is True, then Packed_Size is
812 -- the size in bits so far.
814 Packed_Size_Known : Boolean :=
816 and then not Has_Discriminants (T);
818 Packed_Size : Uint := Uint_0;
821 -- Test for variant part present
823 if Has_Discriminants (T)
824 and then Present (Parent (T))
825 and then Nkind (Parent (T)) = N_Full_Type_Declaration
826 and then Nkind (Type_Definition (Parent (T))) =
828 and then not Null_Present (Type_Definition (Parent (T)))
829 and then Present (Variant_Part
830 (Component_List (Type_Definition (Parent (T)))))
832 -- If variant part is present, and type is unconstrained,
833 -- then we must have defaulted discriminants, or a size
834 -- clause must be present for the type, or else the size
835 -- is definitely not known at compile time.
837 if not Is_Constrained (T)
839 No (Discriminant_Default_Value (First_Discriminant (T)))
840 and then Unknown_Esize (T)
846 -- Loop through components
848 Comp := First_Component_Or_Discriminant (T);
849 while Present (Comp) loop
850 Ctyp := Etype (Comp);
852 -- We do not know the packed size if there is a component
853 -- clause present (we possibly could, but this would only
854 -- help in the case of a record with partial rep clauses.
855 -- That's because in the case of full rep clauses, the
856 -- size gets figured out anyway by a different circuit).
858 if Present (Component_Clause (Comp)) then
859 Packed_Size_Known := False;
862 -- We need to identify a component that is an array where
863 -- the index type is an enumeration type with non-standard
864 -- representation, and some bound of the type depends on a
867 -- This is because gigi computes the size by doing a
868 -- substitution of the appropriate discriminant value in
869 -- the size expression for the base type, and gigi is not
870 -- clever enough to evaluate the resulting expression (which
871 -- involves a call to rep_to_pos) at compile time.
873 -- It would be nice if gigi would either recognize that
874 -- this expression can be computed at compile time, or
875 -- alternatively figured out the size from the subtype
876 -- directly, where all the information is at hand ???
878 if Is_Array_Type (Etype (Comp))
879 and then Present (Packed_Array_Type (Etype (Comp)))
882 Ocomp : constant Entity_Id :=
883 Original_Record_Component (Comp);
884 OCtyp : constant Entity_Id := Etype (Ocomp);
890 Ind := First_Index (OCtyp);
891 while Present (Ind) loop
892 Indtyp := Etype (Ind);
894 if Is_Enumeration_Type (Indtyp)
895 and then Has_Non_Standard_Rep (Indtyp)
897 Lo := Type_Low_Bound (Indtyp);
898 Hi := Type_High_Bound (Indtyp);
900 if Is_Entity_Name (Lo)
901 and then Ekind (Entity (Lo)) = E_Discriminant
905 elsif Is_Entity_Name (Hi)
906 and then Ekind (Entity (Hi)) = E_Discriminant
917 -- Clearly size of record is not known if the size of one of
918 -- the components is not known.
920 if not Size_Known (Ctyp) then
924 -- Accumulate packed size if possible
926 if Packed_Size_Known then
928 -- We can only deal with elementary types, since for
929 -- non-elementary components, alignment enters into the
930 -- picture, and we don't know enough to handle proper
931 -- alignment in this context. Packed arrays count as
932 -- elementary if the representation is a modular type.
934 if Is_Elementary_Type (Ctyp)
935 or else (Is_Array_Type (Ctyp)
936 and then Present (Packed_Array_Type (Ctyp))
937 and then Is_Modular_Integer_Type
938 (Packed_Array_Type (Ctyp)))
940 -- If RM_Size is known and static, then we can keep
941 -- accumulating the packed size.
943 if Known_Static_RM_Size (Ctyp) then
945 -- A little glitch, to be removed sometime ???
946 -- gigi does not understand zero sizes yet.
948 if RM_Size (Ctyp) = Uint_0 then
949 Packed_Size_Known := False;
951 -- Normal case where we can keep accumulating the
952 -- packed array size.
955 Packed_Size := Packed_Size + RM_Size (Ctyp);
958 -- If we have a field whose RM_Size is not known then
959 -- we can't figure out the packed size here.
962 Packed_Size_Known := False;
965 -- If we have a non-elementary type we can't figure out
966 -- the packed array size (alignment issues).
969 Packed_Size_Known := False;
973 Next_Component_Or_Discriminant (Comp);
976 if Packed_Size_Known then
977 Set_Small_Size (T, Packed_Size);
983 -- All other cases, size not known at compile time
990 -------------------------------------
991 -- Static_Discriminated_Components --
992 -------------------------------------
994 function Static_Discriminated_Components
995 (T : Entity_Id) return Boolean
997 Constraint : Elmt_Id;
1000 if Has_Discriminants (T)
1001 and then Present (Discriminant_Constraint (T))
1002 and then Present (First_Component (T))
1004 Constraint := First_Elmt (Discriminant_Constraint (T));
1005 while Present (Constraint) loop
1006 if not Compile_Time_Known_Value (Node (Constraint)) then
1010 Next_Elmt (Constraint);
1015 end Static_Discriminated_Components;
1017 -- Start of processing for Check_Compile_Time_Size
1020 Set_Size_Known_At_Compile_Time (T, Size_Known (T));
1021 end Check_Compile_Time_Size;
1023 -----------------------------
1024 -- Check_Debug_Info_Needed --
1025 -----------------------------
1027 procedure Check_Debug_Info_Needed (T : Entity_Id) is
1029 if Debug_Info_Off (T) then
1032 elsif Comes_From_Source (T)
1033 or else Debug_Generated_Code
1034 or else Debug_Flag_VV
1035 or else Needs_Debug_Info (T)
1037 Set_Debug_Info_Needed (T);
1039 end Check_Debug_Info_Needed;
1041 ----------------------------
1042 -- Check_Strict_Alignment --
1043 ----------------------------
1045 procedure Check_Strict_Alignment (E : Entity_Id) is
1049 if Is_Tagged_Type (E) or else Is_Concurrent_Type (E) then
1050 Set_Strict_Alignment (E);
1052 elsif Is_Array_Type (E) then
1053 Set_Strict_Alignment (E, Strict_Alignment (Component_Type (E)));
1055 elsif Is_Record_Type (E) then
1056 if Is_Limited_Record (E) then
1057 Set_Strict_Alignment (E);
1061 Comp := First_Component (E);
1062 while Present (Comp) loop
1063 if not Is_Type (Comp)
1064 and then (Strict_Alignment (Etype (Comp))
1065 or else Is_Aliased (Comp))
1067 Set_Strict_Alignment (E);
1071 Next_Component (Comp);
1074 end Check_Strict_Alignment;
1076 -------------------------
1077 -- Check_Unsigned_Type --
1078 -------------------------
1080 procedure Check_Unsigned_Type (E : Entity_Id) is
1081 Ancestor : Entity_Id;
1086 if not Is_Discrete_Or_Fixed_Point_Type (E) then
1090 -- Do not attempt to analyze case where range was in error
1092 if No (Scalar_Range (E))
1093 or else Error_Posted (Scalar_Range (E))
1098 -- The situation that is non trivial is something like
1100 -- subtype x1 is integer range -10 .. +10;
1101 -- subtype x2 is x1 range 0 .. V1;
1102 -- subtype x3 is x2 range V2 .. V3;
1103 -- subtype x4 is x3 range V4 .. V5;
1105 -- where Vn are variables. Here the base type is signed, but we still
1106 -- know that x4 is unsigned because of the lower bound of x2.
1108 -- The only way to deal with this is to look up the ancestor chain
1112 if Ancestor = Any_Type or else Etype (Ancestor) = Any_Type then
1116 Lo_Bound := Type_Low_Bound (Ancestor);
1118 if Compile_Time_Known_Value (Lo_Bound) then
1120 if Expr_Rep_Value (Lo_Bound) >= 0 then
1121 Set_Is_Unsigned_Type (E, True);
1127 Ancestor := Ancestor_Subtype (Ancestor);
1129 -- If no ancestor had a static lower bound, go to base type
1131 if No (Ancestor) then
1133 -- Note: the reason we still check for a compile time known
1134 -- value for the base type is that at least in the case of
1135 -- generic formals, we can have bounds that fail this test,
1136 -- and there may be other cases in error situations.
1138 Btyp := Base_Type (E);
1140 if Btyp = Any_Type or else Etype (Btyp) = Any_Type then
1144 Lo_Bound := Type_Low_Bound (Base_Type (E));
1146 if Compile_Time_Known_Value (Lo_Bound)
1147 and then Expr_Rep_Value (Lo_Bound) >= 0
1149 Set_Is_Unsigned_Type (E, True);
1156 end Check_Unsigned_Type;
1158 -------------------------
1159 -- Is_Atomic_Aggregate --
1160 -------------------------
1162 function Is_Atomic_Aggregate
1164 Typ : Entity_Id) return Boolean
1166 Loc : constant Source_Ptr := Sloc (E);
1174 -- Array may be qualified, so find outer context
1176 if Nkind (Par) = N_Qualified_Expression then
1177 Par := Parent (Par);
1180 if Nkind_In (Par, N_Object_Declaration, N_Assignment_Statement)
1181 and then Comes_From_Source (Par)
1183 Temp := Make_Temporary (Loc, 'T', E);
1185 Make_Object_Declaration (Loc,
1186 Defining_Identifier => Temp,
1187 Object_Definition => New_Occurrence_Of (Typ, Loc),
1188 Expression => Relocate_Node (E));
1189 Insert_Before (Par, New_N);
1192 Set_Expression (Par, New_Occurrence_Of (Temp, Loc));
1198 end Is_Atomic_Aggregate;
1204 -- Note: the easy coding for this procedure would be to just build a
1205 -- single list of freeze nodes and then insert them and analyze them
1206 -- all at once. This won't work, because the analysis of earlier freeze
1207 -- nodes may recursively freeze types which would otherwise appear later
1208 -- on in the freeze list. So we must analyze and expand the freeze nodes
1209 -- as they are generated.
1211 procedure Freeze_All (From : Entity_Id; After : in out Node_Id) is
1215 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id);
1216 -- This is the internal recursive routine that does freezing of entities
1217 -- (but NOT the analysis of default expressions, which should not be
1218 -- recursive, we don't want to analyze those till we are sure that ALL
1219 -- the types are frozen).
1221 --------------------
1222 -- Freeze_All_Ent --
1223 --------------------
1225 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id) is
1230 procedure Process_Flist;
1231 -- If freeze nodes are present, insert and analyze, and reset cursor
1232 -- for next insertion.
1238 procedure Process_Flist is
1240 if Is_Non_Empty_List (Flist) then
1241 Lastn := Next (After);
1242 Insert_List_After_And_Analyze (After, Flist);
1244 if Present (Lastn) then
1245 After := Prev (Lastn);
1247 After := Last (List_Containing (After));
1252 -- Start or processing for Freeze_All_Ent
1256 while Present (E) loop
1258 -- If the entity is an inner package which is not a package
1259 -- renaming, then its entities must be frozen at this point. Note
1260 -- that such entities do NOT get frozen at the end of the nested
1261 -- package itself (only library packages freeze).
1263 -- Same is true for task declarations, where anonymous records
1264 -- created for entry parameters must be frozen.
1266 if Ekind (E) = E_Package
1267 and then No (Renamed_Object (E))
1268 and then not Is_Child_Unit (E)
1269 and then not Is_Frozen (E)
1272 Install_Visible_Declarations (E);
1273 Install_Private_Declarations (E);
1275 Freeze_All (First_Entity (E), After);
1277 End_Package_Scope (E);
1279 elsif Ekind (E) in Task_Kind
1281 (Nkind (Parent (E)) = N_Task_Type_Declaration
1283 Nkind (Parent (E)) = N_Single_Task_Declaration)
1286 Freeze_All (First_Entity (E), After);
1289 -- For a derived tagged type, we must ensure that all the
1290 -- primitive operations of the parent have been frozen, so that
1291 -- their addresses will be in the parent's dispatch table at the
1292 -- point it is inherited.
1294 elsif Ekind (E) = E_Record_Type
1295 and then Is_Tagged_Type (E)
1296 and then Is_Tagged_Type (Etype (E))
1297 and then Is_Derived_Type (E)
1300 Prim_List : constant Elist_Id :=
1301 Primitive_Operations (Etype (E));
1307 Prim := First_Elmt (Prim_List);
1308 while Present (Prim) loop
1309 Subp := Node (Prim);
1311 if Comes_From_Source (Subp)
1312 and then not Is_Frozen (Subp)
1314 Flist := Freeze_Entity (Subp, After);
1323 if not Is_Frozen (E) then
1324 Flist := Freeze_Entity (E, After);
1328 -- If an incomplete type is still not frozen, this may be a
1329 -- premature freezing because of a body declaration that follows.
1330 -- Indicate where the freezing took place.
1332 -- If the freezing is caused by the end of the current declarative
1333 -- part, it is a Taft Amendment type, and there is no error.
1335 if not Is_Frozen (E)
1336 and then Ekind (E) = E_Incomplete_Type
1339 Bod : constant Node_Id := Next (After);
1342 if (Nkind_In (Bod, N_Subprogram_Body,
1347 or else Nkind (Bod) in N_Body_Stub)
1349 List_Containing (After) = List_Containing (Parent (E))
1351 Error_Msg_Sloc := Sloc (Next (After));
1353 ("type& is frozen# before its full declaration",
1363 -- Start of processing for Freeze_All
1366 Freeze_All_Ent (From, After);
1368 -- Now that all types are frozen, we can deal with default expressions
1369 -- that require us to build a default expression functions. This is the
1370 -- point at which such functions are constructed (after all types that
1371 -- might be used in such expressions have been frozen).
1373 -- For subprograms that are renaming_as_body, we create the wrapper
1374 -- bodies as needed.
1376 -- We also add finalization chains to access types whose designated
1377 -- types are controlled. This is normally done when freezing the type,
1378 -- but this misses recursive type definitions where the later members
1379 -- of the recursion introduce controlled components.
1381 -- Loop through entities
1384 while Present (E) loop
1385 if Is_Subprogram (E) then
1387 if not Default_Expressions_Processed (E) then
1388 Process_Default_Expressions (E, After);
1391 if not Has_Completion (E) then
1392 Decl := Unit_Declaration_Node (E);
1394 if Nkind (Decl) = N_Subprogram_Renaming_Declaration then
1395 Build_And_Analyze_Renamed_Body (Decl, E, After);
1397 elsif Nkind (Decl) = N_Subprogram_Declaration
1398 and then Present (Corresponding_Body (Decl))
1400 Nkind (Unit_Declaration_Node (Corresponding_Body (Decl)))
1401 = N_Subprogram_Renaming_Declaration
1403 Build_And_Analyze_Renamed_Body
1404 (Decl, Corresponding_Body (Decl), After);
1408 elsif Ekind (E) in Task_Kind
1410 (Nkind (Parent (E)) = N_Task_Type_Declaration
1412 Nkind (Parent (E)) = N_Single_Task_Declaration)
1418 Ent := First_Entity (E);
1419 while Present (Ent) loop
1421 and then not Default_Expressions_Processed (Ent)
1423 Process_Default_Expressions (Ent, After);
1430 elsif Is_Access_Type (E)
1431 and then Comes_From_Source (E)
1432 and then Ekind (Directly_Designated_Type (E)) = E_Incomplete_Type
1433 and then Needs_Finalization (Designated_Type (E))
1434 and then No (Associated_Final_Chain (E))
1436 Build_Final_List (Parent (E), E);
1443 -----------------------
1444 -- Freeze_And_Append --
1445 -----------------------
1447 procedure Freeze_And_Append
1450 Result : in out List_Id)
1452 L : constant List_Id := Freeze_Entity (Ent, N);
1454 if Is_Non_Empty_List (L) then
1455 if Result = No_List then
1458 Append_List (L, Result);
1461 end Freeze_And_Append;
1467 procedure Freeze_Before (N : Node_Id; T : Entity_Id) is
1468 Freeze_Nodes : constant List_Id := Freeze_Entity (T, N);
1470 if Is_Non_Empty_List (Freeze_Nodes) then
1471 Insert_Actions (N, Freeze_Nodes);
1479 function Freeze_Entity (E : Entity_Id; N : Node_Id) return List_Id is
1480 Loc : constant Source_Ptr := Sloc (N);
1481 Test_E : Entity_Id := E;
1489 Has_Default_Initialization : Boolean := False;
1490 -- This flag gets set to true for a variable with default initialization
1492 procedure Check_Current_Instance (Comp_Decl : Node_Id);
1493 -- Check that an Access or Unchecked_Access attribute with a prefix
1494 -- which is the current instance type can only be applied when the type
1497 procedure Check_Suspicious_Modulus (Utype : Entity_Id);
1498 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1499 -- integer literal without an explicit corresponding size clause. The
1500 -- caller has checked that Utype is a modular integer type.
1502 function After_Last_Declaration return Boolean;
1503 -- If Loc is a freeze_entity that appears after the last declaration
1504 -- in the scope, inhibit error messages on late completion.
1506 procedure Freeze_Record_Type (Rec : Entity_Id);
1507 -- Freeze each component, handle some representation clauses, and freeze
1508 -- primitive operations if this is a tagged type.
1510 ----------------------------
1511 -- After_Last_Declaration --
1512 ----------------------------
1514 function After_Last_Declaration return Boolean is
1515 Spec : constant Node_Id := Parent (Current_Scope);
1517 if Nkind (Spec) = N_Package_Specification then
1518 if Present (Private_Declarations (Spec)) then
1519 return Loc >= Sloc (Last (Private_Declarations (Spec)));
1520 elsif Present (Visible_Declarations (Spec)) then
1521 return Loc >= Sloc (Last (Visible_Declarations (Spec)));
1528 end After_Last_Declaration;
1530 ----------------------------
1531 -- Check_Current_Instance --
1532 ----------------------------
1534 procedure Check_Current_Instance (Comp_Decl : Node_Id) is
1536 Rec_Type : constant Entity_Id :=
1537 Scope (Defining_Identifier (Comp_Decl));
1539 Decl : constant Node_Id := Parent (Rec_Type);
1541 function Process (N : Node_Id) return Traverse_Result;
1542 -- Process routine to apply check to given node
1548 function Process (N : Node_Id) return Traverse_Result is
1551 when N_Attribute_Reference =>
1552 if (Attribute_Name (N) = Name_Access
1554 Attribute_Name (N) = Name_Unchecked_Access)
1555 and then Is_Entity_Name (Prefix (N))
1556 and then Is_Type (Entity (Prefix (N)))
1557 and then Entity (Prefix (N)) = E
1560 ("current instance must be a limited type", Prefix (N));
1566 when others => return OK;
1570 procedure Traverse is new Traverse_Proc (Process);
1572 -- Start of processing for Check_Current_Instance
1575 -- In Ada95, the (imprecise) rule is that the current instance of a
1576 -- limited type is aliased. In Ada2005, limitedness must be explicit:
1577 -- either a tagged type, or a limited record.
1579 if Is_Limited_Type (Rec_Type)
1580 and then (Ada_Version < Ada_2005 or else Is_Tagged_Type (Rec_Type))
1584 elsif Nkind (Decl) = N_Full_Type_Declaration
1585 and then Limited_Present (Type_Definition (Decl))
1590 Traverse (Comp_Decl);
1592 end Check_Current_Instance;
1594 ------------------------------
1595 -- Check_Suspicious_Modulus --
1596 ------------------------------
1598 procedure Check_Suspicious_Modulus (Utype : Entity_Id) is
1599 Decl : constant Node_Id := Declaration_Node (Underlying_Type (Utype));
1602 if Nkind (Decl) = N_Full_Type_Declaration then
1604 Tdef : constant Node_Id := Type_Definition (Decl);
1606 if Nkind (Tdef) = N_Modular_Type_Definition then
1608 Modulus : constant Node_Id :=
1609 Original_Node (Expression (Tdef));
1611 if Nkind (Modulus) = N_Integer_Literal then
1613 Modv : constant Uint := Intval (Modulus);
1614 Sizv : constant Uint := RM_Size (Utype);
1617 -- First case, modulus and size are the same. This
1618 -- happens if you have something like mod 32, with
1619 -- an explicit size of 32, this is for sure a case
1620 -- where the warning is given, since it is seems
1621 -- very unlikely that someone would want e.g. a
1622 -- five bit type stored in 32 bits. It is much
1623 -- more likely they wanted a 32-bit type.
1628 -- Second case, the modulus is 32 or 64 and no
1629 -- size clause is present. This is a less clear
1630 -- case for giving the warning, but in the case
1631 -- of 32/64 (5-bit or 6-bit types) these seem rare
1632 -- enough that it is a likely error (and in any
1633 -- case using 2**5 or 2**6 in these cases seems
1634 -- clearer. We don't include 8 or 16 here, simply
1635 -- because in practice 3-bit and 4-bit types are
1636 -- more common and too many false positives if
1637 -- we warn in these cases.
1639 elsif not Has_Size_Clause (Utype)
1640 and then (Modv = Uint_32 or else Modv = Uint_64)
1644 -- No warning needed
1650 -- If we fall through, give warning
1652 Error_Msg_Uint_1 := Modv;
1654 ("?2 '*'*^' may have been intended here",
1662 end Check_Suspicious_Modulus;
1664 ------------------------
1665 -- Freeze_Record_Type --
1666 ------------------------
1668 procedure Freeze_Record_Type (Rec : Entity_Id) is
1675 pragma Warnings (Off, Junk);
1677 Unplaced_Component : Boolean := False;
1678 -- Set True if we find at least one component with no component
1679 -- clause (used to warn about useless Pack pragmas).
1681 Placed_Component : Boolean := False;
1682 -- Set True if we find at least one component with a component
1683 -- clause (used to warn about useless Bit_Order pragmas, and also
1684 -- to detect cases where Implicit_Packing may have an effect).
1686 All_Scalar_Components : Boolean := True;
1687 -- Set False if we encounter a component of a non-scalar type
1689 Scalar_Component_Total_RM_Size : Uint := Uint_0;
1690 Scalar_Component_Total_Esize : Uint := Uint_0;
1691 -- Accumulates total RM_Size values and total Esize values of all
1692 -- scalar components. Used for processing of Implicit_Packing.
1694 function Check_Allocator (N : Node_Id) return Node_Id;
1695 -- If N is an allocator, possibly wrapped in one or more level of
1696 -- qualified expression(s), return the inner allocator node, else
1699 procedure Check_Itype (Typ : Entity_Id);
1700 -- If the component subtype is an access to a constrained subtype of
1701 -- an already frozen type, make the subtype frozen as well. It might
1702 -- otherwise be frozen in the wrong scope, and a freeze node on
1703 -- subtype has no effect. Similarly, if the component subtype is a
1704 -- regular (not protected) access to subprogram, set the anonymous
1705 -- subprogram type to frozen as well, to prevent an out-of-scope
1706 -- freeze node at some eventual point of call. Protected operations
1707 -- are handled elsewhere.
1709 ---------------------
1710 -- Check_Allocator --
1711 ---------------------
1713 function Check_Allocator (N : Node_Id) return Node_Id is
1718 if Nkind (Inner) = N_Allocator then
1720 elsif Nkind (Inner) = N_Qualified_Expression then
1721 Inner := Expression (Inner);
1726 end Check_Allocator;
1732 procedure Check_Itype (Typ : Entity_Id) is
1733 Desig : constant Entity_Id := Designated_Type (Typ);
1736 if not Is_Frozen (Desig)
1737 and then Is_Frozen (Base_Type (Desig))
1739 Set_Is_Frozen (Desig);
1741 -- In addition, add an Itype_Reference to ensure that the
1742 -- access subtype is elaborated early enough. This cannot be
1743 -- done if the subtype may depend on discriminants.
1745 if Ekind (Comp) = E_Component
1746 and then Is_Itype (Etype (Comp))
1747 and then not Has_Discriminants (Rec)
1749 IR := Make_Itype_Reference (Sloc (Comp));
1750 Set_Itype (IR, Desig);
1753 Result := New_List (IR);
1755 Append (IR, Result);
1759 elsif Ekind (Typ) = E_Anonymous_Access_Subprogram_Type
1760 and then Convention (Desig) /= Convention_Protected
1762 Set_Is_Frozen (Desig);
1766 -- Start of processing for Freeze_Record_Type
1769 -- If this is a subtype of a controlled type, declared without a
1770 -- constraint, the _controller may not appear in the component list
1771 -- if the parent was not frozen at the point of subtype declaration.
1772 -- Inherit the _controller component now.
1774 if Rec /= Base_Type (Rec)
1775 and then Has_Controlled_Component (Rec)
1777 if Nkind (Parent (Rec)) = N_Subtype_Declaration
1778 and then Is_Entity_Name (Subtype_Indication (Parent (Rec)))
1780 Set_First_Entity (Rec, First_Entity (Base_Type (Rec)));
1782 -- If this is an internal type without a declaration, as for
1783 -- record component, the base type may not yet be frozen, and its
1784 -- controller has not been created. Add an explicit freeze node
1785 -- for the itype, so it will be frozen after the base type. This
1786 -- freeze node is used to communicate with the expander, in order
1787 -- to create the controller for the enclosing record, and it is
1788 -- deleted afterwards (see exp_ch3). It must not be created when
1789 -- expansion is off, because it might appear in the wrong context
1790 -- for the back end.
1792 elsif Is_Itype (Rec)
1793 and then Has_Delayed_Freeze (Base_Type (Rec))
1795 Nkind (Associated_Node_For_Itype (Rec)) =
1796 N_Component_Declaration
1797 and then Expander_Active
1799 Ensure_Freeze_Node (Rec);
1803 -- Freeze components and embedded subtypes
1805 Comp := First_Entity (Rec);
1807 while Present (Comp) loop
1809 -- First handle the component case
1811 if Ekind (Comp) = E_Component
1812 or else Ekind (Comp) = E_Discriminant
1815 CC : constant Node_Id := Component_Clause (Comp);
1818 -- Freezing a record type freezes the type of each of its
1819 -- components. However, if the type of the component is
1820 -- part of this record, we do not want or need a separate
1821 -- Freeze_Node. Note that Is_Itype is wrong because that's
1822 -- also set in private type cases. We also can't check for
1823 -- the Scope being exactly Rec because of private types and
1824 -- record extensions.
1826 if Is_Itype (Etype (Comp))
1827 and then Is_Record_Type (Underlying_Type
1828 (Scope (Etype (Comp))))
1830 Undelay_Type (Etype (Comp));
1833 Freeze_And_Append (Etype (Comp), N, Result);
1835 -- Check for error of component clause given for variable
1836 -- sized type. We have to delay this test till this point,
1837 -- since the component type has to be frozen for us to know
1838 -- if it is variable length. We omit this test in a generic
1839 -- context, it will be applied at instantiation time.
1841 if Present (CC) then
1842 Placed_Component := True;
1844 if Inside_A_Generic then
1848 Size_Known_At_Compile_Time
1849 (Underlying_Type (Etype (Comp)))
1852 ("component clause not allowed for variable " &
1853 "length component", CC);
1857 Unplaced_Component := True;
1860 -- Case of component requires byte alignment
1862 if Must_Be_On_Byte_Boundary (Etype (Comp)) then
1864 -- Set the enclosing record to also require byte align
1866 Set_Must_Be_On_Byte_Boundary (Rec);
1868 -- Check for component clause that is inconsistent with
1869 -- the required byte boundary alignment.
1872 and then Normalized_First_Bit (Comp) mod
1873 System_Storage_Unit /= 0
1876 ("component & must be byte aligned",
1877 Component_Name (Component_Clause (Comp)));
1883 -- Gather data for possible Implicit_Packing later. Note that at
1884 -- this stage we might be dealing with a real component, or with
1885 -- an implicit subtype declaration.
1887 if not Is_Scalar_Type (Etype (Comp)) then
1888 All_Scalar_Components := False;
1890 Scalar_Component_Total_RM_Size :=
1891 Scalar_Component_Total_RM_Size + RM_Size (Etype (Comp));
1892 Scalar_Component_Total_Esize :=
1893 Scalar_Component_Total_Esize + Esize (Etype (Comp));
1896 -- If the component is an Itype with Delayed_Freeze and is either
1897 -- a record or array subtype and its base type has not yet been
1898 -- frozen, we must remove this from the entity list of this record
1899 -- and put it on the entity list of the scope of its base type.
1900 -- Note that we know that this is not the type of a component
1901 -- since we cleared Has_Delayed_Freeze for it in the previous
1902 -- loop. Thus this must be the Designated_Type of an access type,
1903 -- which is the type of a component.
1906 and then Is_Type (Scope (Comp))
1907 and then Is_Composite_Type (Comp)
1908 and then Base_Type (Comp) /= Comp
1909 and then Has_Delayed_Freeze (Comp)
1910 and then not Is_Frozen (Base_Type (Comp))
1913 Will_Be_Frozen : Boolean := False;
1917 -- We have a pretty bad kludge here. Suppose Rec is subtype
1918 -- being defined in a subprogram that's created as part of
1919 -- the freezing of Rec'Base. In that case, we know that
1920 -- Comp'Base must have already been frozen by the time we
1921 -- get to elaborate this because Gigi doesn't elaborate any
1922 -- bodies until it has elaborated all of the declarative
1923 -- part. But Is_Frozen will not be set at this point because
1924 -- we are processing code in lexical order.
1926 -- We detect this case by going up the Scope chain of Rec
1927 -- and seeing if we have a subprogram scope before reaching
1928 -- the top of the scope chain or that of Comp'Base. If we
1929 -- do, then mark that Comp'Base will actually be frozen. If
1930 -- so, we merely undelay it.
1933 while Present (S) loop
1934 if Is_Subprogram (S) then
1935 Will_Be_Frozen := True;
1937 elsif S = Scope (Base_Type (Comp)) then
1944 if Will_Be_Frozen then
1945 Undelay_Type (Comp);
1947 if Present (Prev) then
1948 Set_Next_Entity (Prev, Next_Entity (Comp));
1950 Set_First_Entity (Rec, Next_Entity (Comp));
1953 -- Insert in entity list of scope of base type (which
1954 -- must be an enclosing scope, because still unfrozen).
1956 Append_Entity (Comp, Scope (Base_Type (Comp)));
1960 -- If the component is an access type with an allocator as default
1961 -- value, the designated type will be frozen by the corresponding
1962 -- expression in init_proc. In order to place the freeze node for
1963 -- the designated type before that for the current record type,
1966 -- Same process if the component is an array of access types,
1967 -- initialized with an aggregate. If the designated type is
1968 -- private, it cannot contain allocators, and it is premature
1969 -- to freeze the type, so we check for this as well.
1971 elsif Is_Access_Type (Etype (Comp))
1972 and then Present (Parent (Comp))
1973 and then Present (Expression (Parent (Comp)))
1976 Alloc : constant Node_Id :=
1977 Check_Allocator (Expression (Parent (Comp)));
1980 if Present (Alloc) then
1982 -- If component is pointer to a classwide type, freeze
1983 -- the specific type in the expression being allocated.
1984 -- The expression may be a subtype indication, in which
1985 -- case freeze the subtype mark.
1987 if Is_Class_Wide_Type
1988 (Designated_Type (Etype (Comp)))
1990 if Is_Entity_Name (Expression (Alloc)) then
1992 (Entity (Expression (Alloc)), N, Result);
1994 Nkind (Expression (Alloc)) = N_Subtype_Indication
1997 (Entity (Subtype_Mark (Expression (Alloc))),
2001 elsif Is_Itype (Designated_Type (Etype (Comp))) then
2002 Check_Itype (Etype (Comp));
2006 (Designated_Type (Etype (Comp)), N, Result);
2011 elsif Is_Access_Type (Etype (Comp))
2012 and then Is_Itype (Designated_Type (Etype (Comp)))
2014 Check_Itype (Etype (Comp));
2016 elsif Is_Array_Type (Etype (Comp))
2017 and then Is_Access_Type (Component_Type (Etype (Comp)))
2018 and then Present (Parent (Comp))
2019 and then Nkind (Parent (Comp)) = N_Component_Declaration
2020 and then Present (Expression (Parent (Comp)))
2021 and then Nkind (Expression (Parent (Comp))) = N_Aggregate
2022 and then Is_Fully_Defined
2023 (Designated_Type (Component_Type (Etype (Comp))))
2027 (Component_Type (Etype (Comp))), N, Result);
2034 -- Deal with pragma Bit_Order setting non-standard bit order
2036 if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then
2037 if not Placed_Component then
2039 Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
2040 Error_Msg_N ("?Bit_Order specification has no effect", ADC);
2042 ("\?since no component clauses were specified", ADC);
2044 -- Here is where we do the processing for reversed bit order
2047 Adjust_Record_For_Reverse_Bit_Order (Rec);
2051 -- Complete error checking on record representation clause (e.g.
2052 -- overlap of components). This is called after adjusting the
2053 -- record for reverse bit order.
2056 RRC : constant Node_Id := Get_Record_Representation_Clause (Rec);
2058 if Present (RRC) then
2059 Check_Record_Representation_Clause (RRC);
2063 -- Set OK_To_Reorder_Components depending on debug flags
2065 if Is_Base_Type (Rec) and then Convention (Rec) = Convention_Ada then
2066 if (Has_Discriminants (Rec) and then Debug_Flag_Dot_V)
2068 (not Has_Discriminants (Rec) and then Debug_Flag_Dot_R)
2070 Set_OK_To_Reorder_Components (Rec);
2074 -- Check for useless pragma Pack when all components placed. We only
2075 -- do this check for record types, not subtypes, since a subtype may
2076 -- have all its components placed, and it still makes perfectly good
2077 -- sense to pack other subtypes or the parent type. We do not give
2078 -- this warning if Optimize_Alignment is set to Space, since the
2079 -- pragma Pack does have an effect in this case (it always resets
2080 -- the alignment to one).
2082 if Ekind (Rec) = E_Record_Type
2083 and then Is_Packed (Rec)
2084 and then not Unplaced_Component
2085 and then Optimize_Alignment /= 'S'
2087 -- Reset packed status. Probably not necessary, but we do it so
2088 -- that there is no chance of the back end doing something strange
2089 -- with this redundant indication of packing.
2091 Set_Is_Packed (Rec, False);
2093 -- Give warning if redundant constructs warnings on
2095 if Warn_On_Redundant_Constructs then
2096 Error_Msg_N -- CODEFIX
2097 ("?pragma Pack has no effect, no unplaced components",
2098 Get_Rep_Pragma (Rec, Name_Pack));
2102 -- If this is the record corresponding to a remote type, freeze the
2103 -- remote type here since that is what we are semantically freezing.
2104 -- This prevents the freeze node for that type in an inner scope.
2106 -- Also, Check for controlled components and unchecked unions.
2107 -- Finally, enforce the restriction that access attributes with a
2108 -- current instance prefix can only apply to limited types.
2110 if Ekind (Rec) = E_Record_Type then
2111 if Present (Corresponding_Remote_Type (Rec)) then
2112 Freeze_And_Append (Corresponding_Remote_Type (Rec), N, Result);
2115 Comp := First_Component (Rec);
2116 while Present (Comp) loop
2118 -- Do not set Has_Controlled_Component on a class-wide
2119 -- equivalent type. See Make_CW_Equivalent_Type.
2121 if not Is_Class_Wide_Equivalent_Type (Rec)
2122 and then (Has_Controlled_Component (Etype (Comp))
2123 or else (Chars (Comp) /= Name_uParent
2124 and then Is_Controlled (Etype (Comp)))
2125 or else (Is_Protected_Type (Etype (Comp))
2127 (Corresponding_Record_Type
2129 and then Has_Controlled_Component
2130 (Corresponding_Record_Type
2133 Set_Has_Controlled_Component (Rec);
2137 if Has_Unchecked_Union (Etype (Comp)) then
2138 Set_Has_Unchecked_Union (Rec);
2141 if Has_Per_Object_Constraint (Comp) then
2143 -- Scan component declaration for likely misuses of current
2144 -- instance, either in a constraint or a default expression.
2146 Check_Current_Instance (Parent (Comp));
2149 Next_Component (Comp);
2153 Set_Component_Alignment_If_Not_Set (Rec);
2155 -- For first subtypes, check if there are any fixed-point fields with
2156 -- component clauses, where we must check the size. This is not done
2157 -- till the freeze point, since for fixed-point types, we do not know
2158 -- the size until the type is frozen. Similar processing applies to
2159 -- bit packed arrays.
2161 if Is_First_Subtype (Rec) then
2162 Comp := First_Component (Rec);
2163 while Present (Comp) loop
2164 if Present (Component_Clause (Comp))
2165 and then (Is_Fixed_Point_Type (Etype (Comp))
2167 Is_Bit_Packed_Array (Etype (Comp)))
2170 (Component_Name (Component_Clause (Comp)),
2176 Next_Component (Comp);
2180 -- Generate warning for applying C or C++ convention to a record
2181 -- with discriminants. This is suppressed for the unchecked union
2182 -- case, since the whole point in this case is interface C. We also
2183 -- do not generate this within instantiations, since we will have
2184 -- generated a message on the template.
2186 if Has_Discriminants (E)
2187 and then not Is_Unchecked_Union (E)
2188 and then (Convention (E) = Convention_C
2190 Convention (E) = Convention_CPP)
2191 and then Comes_From_Source (E)
2192 and then not In_Instance
2193 and then not Has_Warnings_Off (E)
2194 and then not Has_Warnings_Off (Base_Type (E))
2197 Cprag : constant Node_Id := Get_Rep_Pragma (E, Name_Convention);
2201 if Present (Cprag) then
2202 A2 := Next (First (Pragma_Argument_Associations (Cprag)));
2204 if Convention (E) = Convention_C then
2206 ("?variant record has no direct equivalent in C", A2);
2209 ("?variant record has no direct equivalent in C++", A2);
2213 ("\?use of convention for type& is dubious", A2, E);
2218 -- See if Size is too small as is (and implicit packing might help)
2220 if not Is_Packed (Rec)
2222 -- No implicit packing if even one component is explicitly placed
2224 and then not Placed_Component
2226 -- Must have size clause and all scalar components
2228 and then Has_Size_Clause (Rec)
2229 and then All_Scalar_Components
2231 -- Do not try implicit packing on records with discriminants, too
2232 -- complicated, especially in the variant record case.
2234 and then not Has_Discriminants (Rec)
2236 -- We can implicitly pack if the specified size of the record is
2237 -- less than the sum of the object sizes (no point in packing if
2238 -- this is not the case).
2240 and then Esize (Rec) < Scalar_Component_Total_Esize
2242 -- And the total RM size cannot be greater than the specified size
2243 -- since otherwise packing will not get us where we have to be!
2245 and then Esize (Rec) >= Scalar_Component_Total_RM_Size
2247 -- Never do implicit packing in CodePeer mode since we don't do
2248 -- any packing in this mode, since this generates over-complex
2249 -- code that confuses CodePeer, and in general, CodePeer does not
2250 -- care about the internal representation of objects.
2252 and then not CodePeer_Mode
2254 -- If implicit packing enabled, do it
2256 if Implicit_Packing then
2257 Set_Is_Packed (Rec);
2259 -- Otherwise flag the size clause
2263 Sz : constant Node_Id := Size_Clause (Rec);
2265 Error_Msg_NE -- CODEFIX
2266 ("size given for& too small", Sz, Rec);
2267 Error_Msg_N -- CODEFIX
2268 ("\use explicit pragma Pack "
2269 & "or use pragma Implicit_Packing", Sz);
2273 end Freeze_Record_Type;
2275 -- Start of processing for Freeze_Entity
2278 -- We are going to test for various reasons why this entity need not be
2279 -- frozen here, but in the case of an Itype that's defined within a
2280 -- record, that test actually applies to the record.
2282 if Is_Itype (E) and then Is_Record_Type (Scope (E)) then
2283 Test_E := Scope (E);
2284 elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E)))
2285 and then Is_Record_Type (Underlying_Type (Scope (E)))
2287 Test_E := Underlying_Type (Scope (E));
2290 -- Do not freeze if already frozen since we only need one freeze node
2292 if Is_Frozen (E) then
2295 -- It is improper to freeze an external entity within a generic because
2296 -- its freeze node will appear in a non-valid context. The entity will
2297 -- be frozen in the proper scope after the current generic is analyzed.
2299 elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then
2302 -- Do not freeze a global entity within an inner scope created during
2303 -- expansion. A call to subprogram E within some internal procedure
2304 -- (a stream attribute for example) might require freezing E, but the
2305 -- freeze node must appear in the same declarative part as E itself.
2306 -- The two-pass elaboration mechanism in gigi guarantees that E will
2307 -- be frozen before the inner call is elaborated. We exclude constants
2308 -- from this test, because deferred constants may be frozen early, and
2309 -- must be diagnosed (e.g. in the case of a deferred constant being used
2310 -- in a default expression). If the enclosing subprogram comes from
2311 -- source, or is a generic instance, then the freeze point is the one
2312 -- mandated by the language, and we freeze the entity. A subprogram that
2313 -- is a child unit body that acts as a spec does not have a spec that
2314 -- comes from source, but can only come from source.
2316 elsif In_Open_Scopes (Scope (Test_E))
2317 and then Scope (Test_E) /= Current_Scope
2318 and then Ekind (Test_E) /= E_Constant
2325 while Present (S) loop
2326 if Is_Overloadable (S) then
2327 if Comes_From_Source (S)
2328 or else Is_Generic_Instance (S)
2329 or else Is_Child_Unit (S)
2341 -- Similarly, an inlined instance body may make reference to global
2342 -- entities, but these references cannot be the proper freezing point
2343 -- for them, and in the absence of inlining freezing will take place in
2344 -- their own scope. Normally instance bodies are analyzed after the
2345 -- enclosing compilation, and everything has been frozen at the proper
2346 -- place, but with front-end inlining an instance body is compiled
2347 -- before the end of the enclosing scope, and as a result out-of-order
2348 -- freezing must be prevented.
2350 elsif Front_End_Inlining
2351 and then In_Instance_Body
2352 and then Present (Scope (Test_E))
2358 S := Scope (Test_E);
2359 while Present (S) loop
2360 if Is_Generic_Instance (S) then
2373 -- Deal with delayed aspect specifications. The analysis of the aspect
2374 -- is required to be delayed to the freeze point, so we evaluate the
2375 -- pragma or attribute definition clause in the tree at this point.
2377 -- We also have to deal with the case of Boolean aspects, where the
2378 -- value of the Boolean expression is represented by the setting of
2379 -- the Aspect_Cancel flag on the pragma.
2381 if Has_Delayed_Aspects (E) then
2387 -- Look for aspect specification entries for this entity
2389 Ritem := First_Rep_Item (E);
2390 while Present (Ritem) loop
2391 if Nkind (Ritem) = N_Aspect_Specification
2392 and then Entity (Ritem) = E
2394 Aitem := Aspect_Rep_Item (Ritem);
2395 pragma Assert (Is_Delayed_Aspect (Aitem));
2396 Set_Parent (Aitem, Ritem);
2398 -- Deal with Boolean case, if no expression, True, otherwise
2399 -- analyze the expression, check it is static, and if its
2400 -- value is False, set Aspect_Cancel for the related pragma.
2402 if Is_Boolean_Aspect (Ritem) then
2404 Expr : constant Node_Id := Expression (Ritem);
2407 if Present (Expr) then
2408 Analyze_And_Resolve (Expr, Standard_Boolean);
2410 if not Is_OK_Static_Expression (Expr) then
2411 Error_Msg_Name_1 := Chars (Identifier (Ritem));
2413 ("expression for % aspect must be static",
2416 elsif Is_False (Expr_Value (Expr)) then
2417 Set_Aspect_Cancel (Aitem);
2423 -- Analyze the pragma after possibly setting Aspect_Cancel
2428 Next_Rep_Item (Ritem);
2433 -- Here to freeze the entity
2438 -- Case of entity being frozen is other than a type
2440 if not Is_Type (E) then
2442 -- If entity is exported or imported and does not have an external
2443 -- name, now is the time to provide the appropriate default name.
2444 -- Skip this if the entity is stubbed, since we don't need a name
2445 -- for any stubbed routine. For the case on intrinsics, if no
2446 -- external name is specified, then calls will be handled in
2447 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
2448 -- external name is provided, then Expand_Intrinsic_Call leaves
2449 -- calls in place for expansion by GIGI.
2451 if (Is_Imported (E) or else Is_Exported (E))
2452 and then No (Interface_Name (E))
2453 and then Convention (E) /= Convention_Stubbed
2454 and then Convention (E) /= Convention_Intrinsic
2456 Set_Encoded_Interface_Name
2457 (E, Get_Default_External_Name (E));
2459 -- If entity is an atomic object appearing in a declaration and
2460 -- the expression is an aggregate, assign it to a temporary to
2461 -- ensure that the actual assignment is done atomically rather
2462 -- than component-wise (the assignment to the temp may be done
2463 -- component-wise, but that is harmless).
2466 and then Nkind (Parent (E)) = N_Object_Declaration
2467 and then Present (Expression (Parent (E)))
2468 and then Nkind (Expression (Parent (E))) = N_Aggregate
2470 Is_Atomic_Aggregate (Expression (Parent (E)), Etype (E))
2475 -- For a subprogram, freeze all parameter types and also the return
2476 -- type (RM 13.14(14)). However skip this for internal subprograms.
2477 -- This is also the point where any extra formal parameters are
2478 -- created since we now know whether the subprogram will use a
2479 -- foreign convention.
2481 if Is_Subprogram (E) then
2482 if not Is_Internal (E) then
2486 Warn_Node : Node_Id;
2489 -- Loop through formals
2491 Formal := First_Formal (E);
2492 while Present (Formal) loop
2493 F_Type := Etype (Formal);
2494 Freeze_And_Append (F_Type, N, Result);
2496 if Is_Private_Type (F_Type)
2497 and then Is_Private_Type (Base_Type (F_Type))
2498 and then No (Full_View (Base_Type (F_Type)))
2499 and then not Is_Generic_Type (F_Type)
2500 and then not Is_Derived_Type (F_Type)
2502 -- If the type of a formal is incomplete, subprogram
2503 -- is being frozen prematurely. Within an instance
2504 -- (but not within a wrapper package) this is an
2505 -- artifact of our need to regard the end of an
2506 -- instantiation as a freeze point. Otherwise it is
2507 -- a definite error.
2510 Set_Is_Frozen (E, False);
2513 elsif not After_Last_Declaration
2514 and then not Freezing_Library_Level_Tagged_Type
2516 Error_Msg_Node_1 := F_Type;
2518 ("type& must be fully defined before this point",
2523 -- Check suspicious parameter for C function. These tests
2524 -- apply only to exported/imported subprograms.
2526 if Warn_On_Export_Import
2527 and then Comes_From_Source (E)
2528 and then (Convention (E) = Convention_C
2530 Convention (E) = Convention_CPP)
2531 and then (Is_Imported (E) or else Is_Exported (E))
2532 and then Convention (E) /= Convention (Formal)
2533 and then not Has_Warnings_Off (E)
2534 and then not Has_Warnings_Off (F_Type)
2535 and then not Has_Warnings_Off (Formal)
2537 -- Qualify mention of formals with subprogram name
2539 Error_Msg_Qual_Level := 1;
2541 -- Check suspicious use of fat C pointer
2543 if Is_Access_Type (F_Type)
2544 and then Esize (F_Type) > Ttypes.System_Address_Size
2547 ("?type of & does not correspond to C pointer!",
2550 -- Check suspicious return of boolean
2552 elsif Root_Type (F_Type) = Standard_Boolean
2553 and then Convention (F_Type) = Convention_Ada
2554 and then not Has_Warnings_Off (F_Type)
2555 and then not Has_Size_Clause (F_Type)
2556 and then VM_Target = No_VM
2558 Error_Msg_N ("& is an 8-bit Ada Boolean?", Formal);
2560 ("\use appropriate corresponding type in C "
2561 & "(e.g. char)?", Formal);
2563 -- Check suspicious tagged type
2565 elsif (Is_Tagged_Type (F_Type)
2566 or else (Is_Access_Type (F_Type)
2569 (Designated_Type (F_Type))))
2570 and then Convention (E) = Convention_C
2573 ("?& involves a tagged type which does not "
2574 & "correspond to any C type!", Formal);
2576 -- Check wrong convention subprogram pointer
2578 elsif Ekind (F_Type) = E_Access_Subprogram_Type
2579 and then not Has_Foreign_Convention (F_Type)
2582 ("?subprogram pointer & should "
2583 & "have foreign convention!", Formal);
2584 Error_Msg_Sloc := Sloc (F_Type);
2586 ("\?add Convention pragma to declaration of &#",
2590 -- Turn off name qualification after message output
2592 Error_Msg_Qual_Level := 0;
2595 -- Check for unconstrained array in exported foreign
2598 if Has_Foreign_Convention (E)
2599 and then not Is_Imported (E)
2600 and then Is_Array_Type (F_Type)
2601 and then not Is_Constrained (F_Type)
2602 and then Warn_On_Export_Import
2604 -- Exclude VM case, since both .NET and JVM can handle
2605 -- unconstrained arrays without a problem.
2607 and then VM_Target = No_VM
2609 Error_Msg_Qual_Level := 1;
2611 -- If this is an inherited operation, place the
2612 -- warning on the derived type declaration, rather
2613 -- than on the original subprogram.
2615 if Nkind (Original_Node (Parent (E))) =
2616 N_Full_Type_Declaration
2618 Warn_Node := Parent (E);
2620 if Formal = First_Formal (E) then
2622 ("?in inherited operation&", Warn_Node, E);
2625 Warn_Node := Formal;
2629 ("?type of argument& is unconstrained array",
2632 ("?foreign caller must pass bounds explicitly",
2634 Error_Msg_Qual_Level := 0;
2637 if not From_With_Type (F_Type) then
2638 if Is_Access_Type (F_Type) then
2639 F_Type := Designated_Type (F_Type);
2642 -- If the formal is an anonymous_access_to_subprogram
2643 -- freeze the subprogram type as well, to prevent
2644 -- scope anomalies in gigi, because there is no other
2645 -- clear point at which it could be frozen.
2647 if Is_Itype (Etype (Formal))
2648 and then Ekind (F_Type) = E_Subprogram_Type
2650 Freeze_And_Append (F_Type, N, Result);
2654 Next_Formal (Formal);
2657 -- Case of function: similar checks on return type
2659 if Ekind (E) = E_Function then
2661 -- Freeze return type
2663 R_Type := Etype (E);
2664 Freeze_And_Append (R_Type, N, Result);
2666 -- Check suspicious return type for C function
2668 if Warn_On_Export_Import
2669 and then (Convention (E) = Convention_C
2671 Convention (E) = Convention_CPP)
2672 and then (Is_Imported (E) or else Is_Exported (E))
2674 -- Check suspicious return of fat C pointer
2676 if Is_Access_Type (R_Type)
2677 and then Esize (R_Type) > Ttypes.System_Address_Size
2678 and then not Has_Warnings_Off (E)
2679 and then not Has_Warnings_Off (R_Type)
2682 ("?return type of& does not "
2683 & "correspond to C pointer!", E);
2685 -- Check suspicious return of boolean
2687 elsif Root_Type (R_Type) = Standard_Boolean
2688 and then Convention (R_Type) = Convention_Ada
2689 and then VM_Target = No_VM
2690 and then not Has_Warnings_Off (E)
2691 and then not Has_Warnings_Off (R_Type)
2692 and then not Has_Size_Clause (R_Type)
2695 N : constant Node_Id :=
2696 Result_Definition (Declaration_Node (E));
2699 ("return type of & is an 8-bit Ada Boolean?",
2702 ("\use appropriate corresponding type in C "
2703 & "(e.g. char)?", N, E);
2706 -- Check suspicious return tagged type
2708 elsif (Is_Tagged_Type (R_Type)
2709 or else (Is_Access_Type (R_Type)
2712 (Designated_Type (R_Type))))
2713 and then Convention (E) = Convention_C
2714 and then not Has_Warnings_Off (E)
2715 and then not Has_Warnings_Off (R_Type)
2718 ("?return type of & does not "
2719 & "correspond to C type!", E);
2721 -- Check return of wrong convention subprogram pointer
2723 elsif Ekind (R_Type) = E_Access_Subprogram_Type
2724 and then not Has_Foreign_Convention (R_Type)
2725 and then not Has_Warnings_Off (E)
2726 and then not Has_Warnings_Off (R_Type)
2729 ("?& should return a foreign "
2730 & "convention subprogram pointer", E);
2731 Error_Msg_Sloc := Sloc (R_Type);
2733 ("\?add Convention pragma to declaration of& #",
2738 -- Give warning for suspicious return of a result of an
2739 -- unconstrained array type in a foreign convention
2742 if Has_Foreign_Convention (E)
2744 -- We are looking for a return of unconstrained array
2746 and then Is_Array_Type (R_Type)
2747 and then not Is_Constrained (R_Type)
2749 -- Exclude imported routines, the warning does not
2750 -- belong on the import, but on the routine definition.
2752 and then not Is_Imported (E)
2754 -- Exclude VM case, since both .NET and JVM can handle
2755 -- return of unconstrained arrays without a problem.
2757 and then VM_Target = No_VM
2759 -- Check that general warning is enabled, and that it
2760 -- is not suppressed for this particular case.
2762 and then Warn_On_Export_Import
2763 and then not Has_Warnings_Off (E)
2764 and then not Has_Warnings_Off (R_Type)
2767 ("?foreign convention function& should not " &
2768 "return unconstrained array!", E);
2774 -- Must freeze its parent first if it is a derived subprogram
2776 if Present (Alias (E)) then
2777 Freeze_And_Append (Alias (E), N, Result);
2780 -- We don't freeze internal subprograms, because we don't normally
2781 -- want addition of extra formals or mechanism setting to happen
2782 -- for those. However we do pass through predefined dispatching
2783 -- cases, since extra formals may be needed in some cases, such as
2784 -- for the stream 'Input function (build-in-place formals).
2786 if not Is_Internal (E)
2787 or else Is_Predefined_Dispatching_Operation (E)
2789 Freeze_Subprogram (E);
2792 -- Here for other than a subprogram or type
2795 -- If entity has a type, and it is not a generic unit, then
2796 -- freeze it first (RM 13.14(10)).
2798 if Present (Etype (E))
2799 and then Ekind (E) /= E_Generic_Function
2801 Freeze_And_Append (Etype (E), N, Result);
2804 -- Special processing for objects created by object declaration
2806 if Nkind (Declaration_Node (E)) = N_Object_Declaration then
2808 -- Abstract type allowed only for C++ imported variables or
2811 -- Note: we inhibit this check for objects that do not come
2812 -- from source because there is at least one case (the
2813 -- expansion of x'class'input where x is abstract) where we
2814 -- legitimately generate an abstract object.
2816 if Is_Abstract_Type (Etype (E))
2817 and then Comes_From_Source (Parent (E))
2818 and then not (Is_Imported (E)
2819 and then Is_CPP_Class (Etype (E)))
2821 Error_Msg_N ("type of object cannot be abstract",
2822 Object_Definition (Parent (E)));
2824 if Is_CPP_Class (Etype (E)) then
2826 ("\} may need a cpp_constructor",
2827 Object_Definition (Parent (E)), Etype (E));
2831 -- For object created by object declaration, perform required
2832 -- categorization (preelaborate and pure) checks. Defer these
2833 -- checks to freeze time since pragma Import inhibits default
2834 -- initialization and thus pragma Import affects these checks.
2836 Validate_Object_Declaration (Declaration_Node (E));
2838 -- If there is an address clause, check that it is valid
2840 Check_Address_Clause (E);
2842 -- If the object needs any kind of default initialization, an
2843 -- error must be issued if No_Default_Initialization applies.
2844 -- The check doesn't apply to imported objects, which are not
2845 -- ever default initialized, and is why the check is deferred
2846 -- until freezing, at which point we know if Import applies.
2847 -- Deferred constants are also exempted from this test because
2848 -- their completion is explicit, or through an import pragma.
2850 if Ekind (E) = E_Constant
2851 and then Present (Full_View (E))
2855 elsif Comes_From_Source (E)
2856 and then not Is_Imported (E)
2857 and then not Has_Init_Expression (Declaration_Node (E))
2859 ((Has_Non_Null_Base_Init_Proc (Etype (E))
2860 and then not No_Initialization (Declaration_Node (E))
2861 and then not Is_Value_Type (Etype (E))
2862 and then not Suppress_Init_Proc (Etype (E)))
2864 (Needs_Simple_Initialization (Etype (E))
2865 and then not Is_Internal (E)))
2867 Has_Default_Initialization := True;
2869 (No_Default_Initialization, Declaration_Node (E));
2872 -- Check that a Thread_Local_Storage variable does not have
2873 -- default initialization, and any explicit initialization must
2874 -- either be the null constant or a static constant.
2876 if Has_Pragma_Thread_Local_Storage (E) then
2878 Decl : constant Node_Id := Declaration_Node (E);
2880 if Has_Default_Initialization
2882 (Has_Init_Expression (Decl)
2884 (No (Expression (Decl))
2886 (Is_Static_Expression (Expression (Decl))
2888 Nkind (Expression (Decl)) = N_Null)))
2891 ("Thread_Local_Storage variable& is "
2892 & "improperly initialized", Decl, E);
2894 ("\only allowed initialization is explicit "
2895 & "NULL or static expression", Decl, E);
2900 -- For imported objects, set Is_Public unless there is also an
2901 -- address clause, which means that there is no external symbol
2902 -- needed for the Import (Is_Public may still be set for other
2903 -- unrelated reasons). Note that we delayed this processing
2904 -- till freeze time so that we can be sure not to set the flag
2905 -- if there is an address clause. If there is such a clause,
2906 -- then the only purpose of the Import pragma is to suppress
2907 -- implicit initialization.
2910 and then No (Address_Clause (E))
2915 -- For convention C objects of an enumeration type, warn if
2916 -- the size is not integer size and no explicit size given.
2917 -- Skip warning for Boolean, and Character, assume programmer
2918 -- expects 8-bit sizes for these cases.
2920 if (Convention (E) = Convention_C
2922 Convention (E) = Convention_CPP)
2923 and then Is_Enumeration_Type (Etype (E))
2924 and then not Is_Character_Type (Etype (E))
2925 and then not Is_Boolean_Type (Etype (E))
2926 and then Esize (Etype (E)) < Standard_Integer_Size
2927 and then not Has_Size_Clause (E)
2929 Error_Msg_Uint_1 := UI_From_Int (Standard_Integer_Size);
2931 ("?convention C enumeration object has size less than ^",
2933 Error_Msg_N ("\?use explicit size clause to set size", E);
2937 -- Check that a constant which has a pragma Volatile[_Components]
2938 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
2940 -- Note: Atomic[_Components] also sets Volatile[_Components]
2942 if Ekind (E) = E_Constant
2943 and then (Has_Volatile_Components (E) or else Is_Volatile (E))
2944 and then not Is_Imported (E)
2946 -- Make sure we actually have a pragma, and have not merely
2947 -- inherited the indication from elsewhere (e.g. an address
2948 -- clause, which is not good enough in RM terms!)
2950 if Has_Rep_Pragma (E, Name_Atomic)
2952 Has_Rep_Pragma (E, Name_Atomic_Components)
2955 ("stand alone atomic constant must be " &
2956 "imported (RM C.6(13))", E);
2958 elsif Has_Rep_Pragma (E, Name_Volatile)
2960 Has_Rep_Pragma (E, Name_Volatile_Components)
2963 ("stand alone volatile constant must be " &
2964 "imported (RM C.6(13))", E);
2968 -- Static objects require special handling
2970 if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
2971 and then Is_Statically_Allocated (E)
2973 Freeze_Static_Object (E);
2976 -- Remaining step is to layout objects
2978 if Ekind (E) = E_Variable
2980 Ekind (E) = E_Constant
2982 Ekind (E) = E_Loop_Parameter
2990 -- Case of a type or subtype being frozen
2993 -- We used to check here that a full type must have preelaborable
2994 -- initialization if it completes a private type specified with
2995 -- pragma Preelaborable_Initialization, but that missed cases where
2996 -- the types occur within a generic package, since the freezing
2997 -- that occurs within a containing scope generally skips traversal
2998 -- of a generic unit's declarations (those will be frozen within
2999 -- instances). This check was moved to Analyze_Package_Specification.
3001 -- The type may be defined in a generic unit. This can occur when
3002 -- freezing a generic function that returns the type (which is
3003 -- defined in a parent unit). It is clearly meaningless to freeze
3004 -- this type. However, if it is a subtype, its size may be determi-
3005 -- nable and used in subsequent checks, so might as well try to
3008 if Present (Scope (E))
3009 and then Is_Generic_Unit (Scope (E))
3011 Check_Compile_Time_Size (E);
3015 -- Deal with special cases of freezing for subtype
3017 if E /= Base_Type (E) then
3019 -- Before we do anything else, a specialized test for the case of
3020 -- a size given for an array where the array needs to be packed,
3021 -- but was not so the size cannot be honored. This would of course
3022 -- be caught by the backend, and indeed we don't catch all cases.
3023 -- The point is that we can give a better error message in those
3024 -- cases that we do catch with the circuitry here. Also if pragma
3025 -- Implicit_Packing is set, this is where the packing occurs.
3027 -- The reason we do this so early is that the processing in the
3028 -- automatic packing case affects the layout of the base type, so
3029 -- it must be done before we freeze the base type.
3031 if Is_Array_Type (E) then
3034 Ctyp : constant Entity_Id := Component_Type (E);
3037 -- Check enabling conditions. These are straightforward
3038 -- except for the test for a limited composite type. This
3039 -- eliminates the rare case of a array of limited components
3040 -- where there are issues of whether or not we can go ahead
3041 -- and pack the array (since we can't freely pack and unpack
3042 -- arrays if they are limited).
3044 -- Note that we check the root type explicitly because the
3045 -- whole point is we are doing this test before we have had
3046 -- a chance to freeze the base type (and it is that freeze
3047 -- action that causes stuff to be inherited).
3049 if Present (Size_Clause (E))
3050 and then Known_Static_Esize (E)
3051 and then not Is_Packed (E)
3052 and then not Has_Pragma_Pack (E)
3053 and then Number_Dimensions (E) = 1
3054 and then not Has_Component_Size_Clause (E)
3055 and then Known_Static_Esize (Ctyp)
3056 and then not Is_Limited_Composite (E)
3057 and then not Is_Packed (Root_Type (E))
3058 and then not Has_Component_Size_Clause (Root_Type (E))
3059 and then not CodePeer_Mode
3061 Get_Index_Bounds (First_Index (E), Lo, Hi);
3063 if Compile_Time_Known_Value (Lo)
3064 and then Compile_Time_Known_Value (Hi)
3065 and then Known_Static_RM_Size (Ctyp)
3066 and then RM_Size (Ctyp) < 64
3069 Lov : constant Uint := Expr_Value (Lo);
3070 Hiv : constant Uint := Expr_Value (Hi);
3071 Len : constant Uint := UI_Max
3074 Rsiz : constant Uint := RM_Size (Ctyp);
3075 SZ : constant Node_Id := Size_Clause (E);
3076 Btyp : constant Entity_Id := Base_Type (E);
3078 -- What we are looking for here is the situation where
3079 -- the RM_Size given would be exactly right if there
3080 -- was a pragma Pack (resulting in the component size
3081 -- being the same as the RM_Size). Furthermore, the
3082 -- component type size must be an odd size (not a
3083 -- multiple of storage unit). If the component RM size
3084 -- is an exact number of storage units that is a power
3085 -- of two, the array is not packed and has a standard
3089 if RM_Size (E) = Len * Rsiz
3090 and then Rsiz mod System_Storage_Unit /= 0
3092 -- For implicit packing mode, just set the
3093 -- component size silently.
3095 if Implicit_Packing then
3096 Set_Component_Size (Btyp, Rsiz);
3097 Set_Is_Bit_Packed_Array (Btyp);
3098 Set_Is_Packed (Btyp);
3099 Set_Has_Non_Standard_Rep (Btyp);
3101 -- Otherwise give an error message
3105 ("size given for& too small", SZ, E);
3106 Error_Msg_N -- CODEFIX
3107 ("\use explicit pragma Pack "
3108 & "or use pragma Implicit_Packing", SZ);
3111 elsif RM_Size (E) = Len * Rsiz
3112 and then Implicit_Packing
3114 (Rsiz / System_Storage_Unit = 1
3115 or else Rsiz / System_Storage_Unit = 2
3116 or else Rsiz / System_Storage_Unit = 4)
3119 -- Not a packed array, but indicate the desired
3120 -- component size, for the back-end.
3122 Set_Component_Size (Btyp, Rsiz);
3130 -- If ancestor subtype present, freeze that first. Note that this
3131 -- will also get the base type frozen. Need RM reference ???
3133 Atype := Ancestor_Subtype (E);
3135 if Present (Atype) then
3136 Freeze_And_Append (Atype, N, Result);
3138 -- No ancestor subtype present
3141 -- See if we have a nearest ancestor that has a predicate.
3142 -- That catches the case of derived type with a predicate.
3143 -- Need RM reference here ???
3145 Atype := Nearest_Ancestor (E);
3147 if Present (Atype) and then Has_Predicates (Atype) then
3148 Freeze_And_Append (Atype, N, Result);
3151 -- Freeze base type before freezing the entity (RM 13.14(15))
3153 if E /= Base_Type (E) then
3154 Freeze_And_Append (Base_Type (E), N, Result);
3158 -- For a derived type, freeze its parent type first (RM 13.14(15))
3160 elsif Is_Derived_Type (E) then
3161 Freeze_And_Append (Etype (E), N, Result);
3162 Freeze_And_Append (First_Subtype (Etype (E)), N, Result);
3165 -- For array type, freeze index types and component type first
3166 -- before freezing the array (RM 13.14(15)).
3168 if Is_Array_Type (E) then
3170 FS : constant Entity_Id := First_Subtype (E);
3171 Ctyp : constant Entity_Id := Component_Type (E);
3174 Non_Standard_Enum : Boolean := False;
3175 -- Set true if any of the index types is an enumeration type
3176 -- with a non-standard representation.
3179 Freeze_And_Append (Ctyp, N, Result);
3181 Indx := First_Index (E);
3182 while Present (Indx) loop
3183 Freeze_And_Append (Etype (Indx), N, Result);
3185 if Is_Enumeration_Type (Etype (Indx))
3186 and then Has_Non_Standard_Rep (Etype (Indx))
3188 Non_Standard_Enum := True;
3194 -- Processing that is done only for base types
3196 if Ekind (E) = E_Array_Type then
3198 -- Propagate flags for component type
3200 if Is_Controlled (Component_Type (E))
3201 or else Has_Controlled_Component (Ctyp)
3203 Set_Has_Controlled_Component (E);
3206 if Has_Unchecked_Union (Component_Type (E)) then
3207 Set_Has_Unchecked_Union (E);
3210 -- If packing was requested or if the component size was set
3211 -- explicitly, then see if bit packing is required. This
3212 -- processing is only done for base types, since all the
3213 -- representation aspects involved are type-related. This
3214 -- is not just an optimization, if we start processing the
3215 -- subtypes, they interfere with the settings on the base
3216 -- type (this is because Is_Packed has a slightly different
3217 -- meaning before and after freezing).
3224 if (Is_Packed (E) or else Has_Pragma_Pack (E))
3225 and then Known_Static_RM_Size (Ctyp)
3226 and then not Has_Component_Size_Clause (E)
3228 Csiz := UI_Max (RM_Size (Ctyp), 1);
3230 elsif Known_Component_Size (E) then
3231 Csiz := Component_Size (E);
3233 elsif not Known_Static_Esize (Ctyp) then
3237 Esiz := Esize (Ctyp);
3239 -- We can set the component size if it is less than
3240 -- 16, rounding it up to the next storage unit size.
3244 elsif Esiz <= 16 then
3250 -- Set component size up to match alignment if it
3251 -- would otherwise be less than the alignment. This
3252 -- deals with cases of types whose alignment exceeds
3253 -- their size (padded types).
3257 A : constant Uint := Alignment_In_Bits (Ctyp);
3266 -- Case of component size that may result in packing
3268 if 1 <= Csiz and then Csiz <= 64 then
3270 Ent : constant Entity_Id :=
3272 Pack_Pragma : constant Node_Id :=
3273 Get_Rep_Pragma (Ent, Name_Pack);
3274 Comp_Size_C : constant Node_Id :=
3275 Get_Attribute_Definition_Clause
3276 (Ent, Attribute_Component_Size);
3278 -- Warn if we have pack and component size so that
3279 -- the pack is ignored.
3281 -- Note: here we must check for the presence of a
3282 -- component size before checking for a Pack pragma
3283 -- to deal with the case where the array type is a
3284 -- derived type whose parent is currently private.
3286 if Present (Comp_Size_C)
3287 and then Has_Pragma_Pack (Ent)
3288 and then Warn_On_Redundant_Constructs
3290 Error_Msg_Sloc := Sloc (Comp_Size_C);
3292 ("?pragma Pack for& ignored!",
3295 ("\?explicit component size given#!",
3297 Set_Is_Packed (Base_Type (Ent), False);
3298 Set_Is_Bit_Packed_Array (Base_Type (Ent), False);
3301 -- Set component size if not already set by a
3302 -- component size clause.
3304 if not Present (Comp_Size_C) then
3305 Set_Component_Size (E, Csiz);
3308 -- Check for base type of 8, 16, 32 bits, where an
3309 -- unsigned subtype has a length one less than the
3310 -- base type (e.g. Natural subtype of Integer).
3312 -- In such cases, if a component size was not set
3313 -- explicitly, then generate a warning.
3315 if Has_Pragma_Pack (E)
3316 and then not Present (Comp_Size_C)
3318 (Csiz = 7 or else Csiz = 15 or else Csiz = 31)
3319 and then Esize (Base_Type (Ctyp)) = Csiz + 1
3321 Error_Msg_Uint_1 := Csiz;
3323 if Present (Pack_Pragma) then
3325 ("?pragma Pack causes component size "
3326 & "to be ^!", Pack_Pragma);
3328 ("\?use Component_Size to set "
3329 & "desired value!", Pack_Pragma);
3333 -- Actual packing is not needed for 8, 16, 32, 64.
3334 -- Also not needed for 24 if alignment is 1.
3340 or else (Csiz = 24 and then Alignment (Ctyp) = 1)
3342 -- Here the array was requested to be packed,
3343 -- but the packing request had no effect, so
3344 -- Is_Packed is reset.
3346 -- Note: semantically this means that we lose
3347 -- track of the fact that a derived type
3348 -- inherited a pragma Pack that was non-
3349 -- effective, but that seems fine.
3351 -- We regard a Pack pragma as a request to set
3352 -- a representation characteristic, and this
3353 -- request may be ignored.
3355 Set_Is_Packed (Base_Type (E), False);
3356 Set_Is_Bit_Packed_Array (Base_Type (E), False);
3358 if Known_Static_Esize (Component_Type (E))
3359 and then Esize (Component_Type (E)) = Csiz
3361 Set_Has_Non_Standard_Rep
3362 (Base_Type (E), False);
3365 -- In all other cases, packing is indeed needed
3368 Set_Has_Non_Standard_Rep (Base_Type (E), True);
3369 Set_Is_Bit_Packed_Array (Base_Type (E), True);
3370 Set_Is_Packed (Base_Type (E), True);
3376 -- Check for Atomic_Components or Aliased with unsuitable
3377 -- packing or explicit component size clause given.
3379 if (Has_Atomic_Components (E)
3380 or else Has_Aliased_Components (E))
3381 and then (Has_Component_Size_Clause (E)
3382 or else Is_Packed (E))
3384 Alias_Atomic_Check : declare
3386 procedure Complain_CS (T : String);
3387 -- Outputs error messages for incorrect CS clause or
3388 -- pragma Pack for aliased or atomic components (T is
3389 -- "aliased" or "atomic");
3395 procedure Complain_CS (T : String) is
3397 if Has_Component_Size_Clause (E) then
3399 Get_Attribute_Definition_Clause
3400 (FS, Attribute_Component_Size);
3402 if Known_Static_Esize (Ctyp) then
3404 ("incorrect component size for "
3405 & T & " components", Clause);
3406 Error_Msg_Uint_1 := Esize (Ctyp);
3408 ("\only allowed value is^", Clause);
3412 ("component size cannot be given for "
3413 & T & " components", Clause);
3418 ("cannot pack " & T & " components",
3419 Get_Rep_Pragma (FS, Name_Pack));
3425 -- Start of processing for Alias_Atomic_Check
3428 -- Case where component size has no effect
3430 if Known_Static_Esize (Ctyp)
3431 and then Known_Static_RM_Size (Ctyp)
3432 and then Esize (Ctyp) = RM_Size (Ctyp)
3433 and then Esize (Ctyp) mod 8 = 0
3437 elsif Has_Aliased_Components (E)
3438 or else Is_Aliased (Ctyp)
3440 Complain_CS ("aliased");
3442 elsif Has_Atomic_Components (E)
3443 or else Is_Atomic (Ctyp)
3445 Complain_CS ("atomic");
3447 end Alias_Atomic_Check;
3450 -- Warn for case of atomic type
3452 Clause := Get_Rep_Pragma (FS, Name_Atomic);
3455 and then not Addressable (Component_Size (FS))
3458 ("non-atomic components of type& may not be "
3459 & "accessible by separate tasks?", Clause, E);
3461 if Has_Component_Size_Clause (E) then
3464 (Get_Attribute_Definition_Clause
3465 (FS, Attribute_Component_Size));
3467 ("\because of component size clause#?",
3470 elsif Has_Pragma_Pack (E) then
3472 Sloc (Get_Rep_Pragma (FS, Name_Pack));
3474 ("\because of pragma Pack#?", Clause);
3478 -- Processing that is done only for subtypes
3481 -- Acquire alignment from base type
3483 if Unknown_Alignment (E) then
3484 Set_Alignment (E, Alignment (Base_Type (E)));
3485 Adjust_Esize_Alignment (E);
3489 -- For bit-packed arrays, check the size
3491 if Is_Bit_Packed_Array (E) and then Known_RM_Size (E) then
3493 SizC : constant Node_Id := Size_Clause (E);
3496 pragma Warnings (Off, Discard);
3499 -- It is not clear if it is possible to have no size
3500 -- clause at this stage, but it is not worth worrying
3501 -- about. Post error on the entity name in the size
3502 -- clause if present, else on the type entity itself.
3504 if Present (SizC) then
3505 Check_Size (Name (SizC), E, RM_Size (E), Discard);
3507 Check_Size (E, E, RM_Size (E), Discard);
3512 -- If any of the index types was an enumeration type with a
3513 -- non-standard rep clause, then we indicate that the array
3514 -- type is always packed (even if it is not bit packed).
3516 if Non_Standard_Enum then
3517 Set_Has_Non_Standard_Rep (Base_Type (E));
3518 Set_Is_Packed (Base_Type (E));
3521 Set_Component_Alignment_If_Not_Set (E);
3523 -- If the array is packed, we must create the packed array
3524 -- type to be used to actually implement the type. This is
3525 -- only needed for real array types (not for string literal
3526 -- types, since they are present only for the front end).
3529 and then Ekind (E) /= E_String_Literal_Subtype
3531 Create_Packed_Array_Type (E);
3532 Freeze_And_Append (Packed_Array_Type (E), N, Result);
3534 -- Size information of packed array type is copied to the
3535 -- array type, since this is really the representation. But
3536 -- do not override explicit existing size values. If the
3537 -- ancestor subtype is constrained the packed_array_type
3538 -- will be inherited from it, but the size may have been
3539 -- provided already, and must not be overridden either.
3541 if not Has_Size_Clause (E)
3543 (No (Ancestor_Subtype (E))
3544 or else not Has_Size_Clause (Ancestor_Subtype (E)))
3546 Set_Esize (E, Esize (Packed_Array_Type (E)));
3547 Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
3550 if not Has_Alignment_Clause (E) then
3551 Set_Alignment (E, Alignment (Packed_Array_Type (E)));
3555 -- For non-packed arrays set the alignment of the array to the
3556 -- alignment of the component type if it is unknown. Skip this
3557 -- in atomic case (atomic arrays may need larger alignments).
3559 if not Is_Packed (E)
3560 and then Unknown_Alignment (E)
3561 and then Known_Alignment (Ctyp)
3562 and then Known_Static_Component_Size (E)
3563 and then Known_Static_Esize (Ctyp)
3564 and then Esize (Ctyp) = Component_Size (E)
3565 and then not Is_Atomic (E)
3567 Set_Alignment (E, Alignment (Component_Type (E)));
3571 -- For a class-wide type, the corresponding specific type is
3572 -- frozen as well (RM 13.14(15))
3574 elsif Is_Class_Wide_Type (E) then
3575 Freeze_And_Append (Root_Type (E), N, Result);
3577 -- If the base type of the class-wide type is still incomplete,
3578 -- the class-wide remains unfrozen as well. This is legal when
3579 -- E is the formal of a primitive operation of some other type
3580 -- which is being frozen.
3582 if not Is_Frozen (Root_Type (E)) then
3583 Set_Is_Frozen (E, False);
3587 -- If the Class_Wide_Type is an Itype (when type is the anonymous
3588 -- parent of a derived type) and it is a library-level entity,
3589 -- generate an itype reference for it. Otherwise, its first
3590 -- explicit reference may be in an inner scope, which will be
3591 -- rejected by the back-end.
3594 and then Is_Compilation_Unit (Scope (E))
3597 Ref : constant Node_Id := Make_Itype_Reference (Loc);
3602 Result := New_List (Ref);
3604 Append (Ref, Result);
3609 -- The equivalent type associated with a class-wide subtype needs
3610 -- to be frozen to ensure that its layout is done.
3612 if Ekind (E) = E_Class_Wide_Subtype
3613 and then Present (Equivalent_Type (E))
3615 Freeze_And_Append (Equivalent_Type (E), N, Result);
3618 -- For a record (sub)type, freeze all the component types (RM
3619 -- 13.14(15). We test for E_Record_(sub)Type here, rather than using
3620 -- Is_Record_Type, because we don't want to attempt the freeze for
3621 -- the case of a private type with record extension (we will do that
3622 -- later when the full type is frozen).
3624 elsif Ekind (E) = E_Record_Type
3625 or else Ekind (E) = E_Record_Subtype
3627 Freeze_Record_Type (E);
3629 -- For a concurrent type, freeze corresponding record type. This
3630 -- does not correspond to any specific rule in the RM, but the
3631 -- record type is essentially part of the concurrent type.
3632 -- Freeze as well all local entities. This includes record types
3633 -- created for entry parameter blocks, and whatever local entities
3634 -- may appear in the private part.
3636 elsif Is_Concurrent_Type (E) then
3637 if Present (Corresponding_Record_Type (E)) then
3639 (Corresponding_Record_Type (E), N, Result);
3642 Comp := First_Entity (E);
3643 while Present (Comp) loop
3644 if Is_Type (Comp) then
3645 Freeze_And_Append (Comp, N, Result);
3647 elsif (Ekind (Comp)) /= E_Function then
3648 if Is_Itype (Etype (Comp))
3649 and then Underlying_Type (Scope (Etype (Comp))) = E
3651 Undelay_Type (Etype (Comp));
3654 Freeze_And_Append (Etype (Comp), N, Result);
3660 -- Private types are required to point to the same freeze node as
3661 -- their corresponding full views. The freeze node itself has to
3662 -- point to the partial view of the entity (because from the partial
3663 -- view, we can retrieve the full view, but not the reverse).
3664 -- However, in order to freeze correctly, we need to freeze the full
3665 -- view. If we are freezing at the end of a scope (or within the
3666 -- scope of the private type), the partial and full views will have
3667 -- been swapped, the full view appears first in the entity chain and
3668 -- the swapping mechanism ensures that the pointers are properly set
3671 -- If we encounter the partial view before the full view (e.g. when
3672 -- freezing from another scope), we freeze the full view, and then
3673 -- set the pointers appropriately since we cannot rely on swapping to
3674 -- fix things up (subtypes in an outer scope might not get swapped).
3676 elsif Is_Incomplete_Or_Private_Type (E)
3677 and then not Is_Generic_Type (E)
3679 -- The construction of the dispatch table associated with library
3680 -- level tagged types forces freezing of all the primitives of the
3681 -- type, which may cause premature freezing of the partial view.
3685 -- type T is tagged private;
3686 -- type DT is new T with private;
3687 -- procedure Prim (X : in out T; Y : in out DT'class);
3689 -- type T is tagged null record;
3691 -- type DT is new T with null record;
3694 -- In this case the type will be frozen later by the usual
3695 -- mechanism: an object declaration, an instantiation, or the
3696 -- end of a declarative part.
3698 if Is_Library_Level_Tagged_Type (E)
3699 and then not Present (Full_View (E))
3701 Set_Is_Frozen (E, False);
3704 -- Case of full view present
3706 elsif Present (Full_View (E)) then
3708 -- If full view has already been frozen, then no further
3709 -- processing is required
3711 if Is_Frozen (Full_View (E)) then
3712 Set_Has_Delayed_Freeze (E, False);
3713 Set_Freeze_Node (E, Empty);
3714 Check_Debug_Info_Needed (E);
3716 -- Otherwise freeze full view and patch the pointers so that
3717 -- the freeze node will elaborate both views in the back-end.
3721 Full : constant Entity_Id := Full_View (E);
3724 if Is_Private_Type (Full)
3725 and then Present (Underlying_Full_View (Full))
3728 (Underlying_Full_View (Full), N, Result);
3731 Freeze_And_Append (Full, N, Result);
3733 if Has_Delayed_Freeze (E) then
3734 F_Node := Freeze_Node (Full);
3736 if Present (F_Node) then
3737 Set_Freeze_Node (E, F_Node);
3738 Set_Entity (F_Node, E);
3741 -- {Incomplete,Private}_Subtypes with Full_Views
3742 -- constrained by discriminants.
3744 Set_Has_Delayed_Freeze (E, False);
3745 Set_Freeze_Node (E, Empty);
3750 Check_Debug_Info_Needed (E);
3753 -- AI-117 requires that the convention of a partial view be the
3754 -- same as the convention of the full view. Note that this is a
3755 -- recognized breach of privacy, but it's essential for logical
3756 -- consistency of representation, and the lack of a rule in
3757 -- RM95 was an oversight.
3759 Set_Convention (E, Convention (Full_View (E)));
3761 Set_Size_Known_At_Compile_Time (E,
3762 Size_Known_At_Compile_Time (Full_View (E)));
3764 -- Size information is copied from the full view to the
3765 -- incomplete or private view for consistency.
3767 -- We skip this is the full view is not a type. This is very
3768 -- strange of course, and can only happen as a result of
3769 -- certain illegalities, such as a premature attempt to derive
3770 -- from an incomplete type.
3772 if Is_Type (Full_View (E)) then
3773 Set_Size_Info (E, Full_View (E));
3774 Set_RM_Size (E, RM_Size (Full_View (E)));
3779 -- Case of no full view present. If entity is derived or subtype,
3780 -- it is safe to freeze, correctness depends on the frozen status
3781 -- of parent. Otherwise it is either premature usage, or a Taft
3782 -- amendment type, so diagnosis is at the point of use and the
3783 -- type might be frozen later.
3785 elsif E /= Base_Type (E)
3786 or else Is_Derived_Type (E)
3791 Set_Is_Frozen (E, False);
3795 -- For access subprogram, freeze types of all formals, the return
3796 -- type was already frozen, since it is the Etype of the function.
3797 -- Formal types can be tagged Taft amendment types, but otherwise
3798 -- they cannot be incomplete.
3800 elsif Ekind (E) = E_Subprogram_Type then
3801 Formal := First_Formal (E);
3802 while Present (Formal) loop
3803 if Ekind (Etype (Formal)) = E_Incomplete_Type
3804 and then No (Full_View (Etype (Formal)))
3805 and then not Is_Value_Type (Etype (Formal))
3807 if Is_Tagged_Type (Etype (Formal)) then
3810 -- AI05-151: Incomplete types are allowed in access to
3811 -- subprogram specifications.
3813 elsif Ada_Version < Ada_2012 then
3815 ("invalid use of incomplete type&", E, Etype (Formal));
3819 Freeze_And_Append (Etype (Formal), N, Result);
3820 Next_Formal (Formal);
3823 Freeze_Subprogram (E);
3825 -- For access to a protected subprogram, freeze the equivalent type
3826 -- (however this is not set if we are not generating code or if this
3827 -- is an anonymous type used just for resolution).
3829 elsif Is_Access_Protected_Subprogram_Type (E) then
3830 if Present (Equivalent_Type (E)) then
3831 Freeze_And_Append (Equivalent_Type (E), N, Result);
3835 -- Generic types are never seen by the back-end, and are also not
3836 -- processed by the expander (since the expander is turned off for
3837 -- generic processing), so we never need freeze nodes for them.
3839 if Is_Generic_Type (E) then
3843 -- Some special processing for non-generic types to complete
3844 -- representation details not known till the freeze point.
3846 if Is_Fixed_Point_Type (E) then
3847 Freeze_Fixed_Point_Type (E);
3849 -- Some error checks required for ordinary fixed-point type. Defer
3850 -- these till the freeze-point since we need the small and range
3851 -- values. We only do these checks for base types
3853 if Is_Ordinary_Fixed_Point_Type (E) and then Is_Base_Type (E) then
3854 if Small_Value (E) < Ureal_2_M_80 then
3855 Error_Msg_Name_1 := Name_Small;
3857 ("`&''%` too small, minimum allowed is 2.0'*'*(-80)", E);
3859 elsif Small_Value (E) > Ureal_2_80 then
3860 Error_Msg_Name_1 := Name_Small;
3862 ("`&''%` too large, maximum allowed is 2.0'*'*80", E);
3865 if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then
3866 Error_Msg_Name_1 := Name_First;
3868 ("`&''%` too small, minimum allowed is -10.0'*'*36", E);
3871 if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then
3872 Error_Msg_Name_1 := Name_Last;
3874 ("`&''%` too large, maximum allowed is 10.0'*'*36", E);
3878 elsif Is_Enumeration_Type (E) then
3879 Freeze_Enumeration_Type (E);
3881 elsif Is_Integer_Type (E) then
3882 Adjust_Esize_For_Alignment (E);
3884 if Is_Modular_Integer_Type (E)
3885 and then Warn_On_Suspicious_Modulus_Value
3887 Check_Suspicious_Modulus (E);
3890 elsif Is_Access_Type (E) then
3892 -- If a pragma Default_Storage_Pool applies, and this type has no
3893 -- Storage_Pool or Storage_Size clause (which must have occurred
3894 -- before the freezing point), then use the default. This applies
3895 -- only to base types.
3897 if Present (Default_Pool)
3898 and then Is_Base_Type (E)
3899 and then not Has_Storage_Size_Clause (E)
3900 and then No (Associated_Storage_Pool (E))
3902 -- Case of pragma Default_Storage_Pool (null)
3904 if Nkind (Default_Pool) = N_Null then
3905 Set_No_Pool_Assigned (E);
3907 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
3910 Set_Associated_Storage_Pool (E, Entity (Default_Pool));
3914 -- Check restriction for standard storage pool
3916 if No (Associated_Storage_Pool (E)) then
3917 Check_Restriction (No_Standard_Storage_Pools, E);
3920 -- Deal with error message for pure access type. This is not an
3921 -- error in Ada 2005 if there is no pool (see AI-366).
3923 if Is_Pure_Unit_Access_Type (E)
3924 and then (Ada_Version < Ada_2005
3925 or else not No_Pool_Assigned (E))
3927 Error_Msg_N ("named access type not allowed in pure unit", E);
3929 if Ada_Version >= Ada_2005 then
3931 ("\would be legal if Storage_Size of 0 given?", E);
3933 elsif No_Pool_Assigned (E) then
3935 ("\would be legal in Ada 2005?", E);
3939 ("\would be legal in Ada 2005 if "
3940 & "Storage_Size of 0 given?", E);
3945 -- Case of composite types
3947 if Is_Composite_Type (E) then
3949 -- AI-117 requires that all new primitives of a tagged type must
3950 -- inherit the convention of the full view of the type. Inherited
3951 -- and overriding operations are defined to inherit the convention
3952 -- of their parent or overridden subprogram (also specified in
3953 -- AI-117), which will have occurred earlier (in Derive_Subprogram
3954 -- and New_Overloaded_Entity). Here we set the convention of
3955 -- primitives that are still convention Ada, which will ensure
3956 -- that any new primitives inherit the type's convention. Class-
3957 -- wide types can have a foreign convention inherited from their
3958 -- specific type, but are excluded from this since they don't have
3959 -- any associated primitives.
3961 if Is_Tagged_Type (E)
3962 and then not Is_Class_Wide_Type (E)
3963 and then Convention (E) /= Convention_Ada
3966 Prim_List : constant Elist_Id := Primitive_Operations (E);
3970 Prim := First_Elmt (Prim_List);
3971 while Present (Prim) loop
3972 if Convention (Node (Prim)) = Convention_Ada then
3973 Set_Convention (Node (Prim), Convention (E));
3982 -- Now that all types from which E may depend are frozen, see if the
3983 -- size is known at compile time, if it must be unsigned, or if
3984 -- strict alignment is required
3986 Check_Compile_Time_Size (E);
3987 Check_Unsigned_Type (E);
3989 if Base_Type (E) = E then
3990 Check_Strict_Alignment (E);
3993 -- Do not allow a size clause for a type which does not have a size
3994 -- that is known at compile time
3996 if Has_Size_Clause (E)
3997 and then not Size_Known_At_Compile_Time (E)
3999 -- Suppress this message if errors posted on E, even if we are
4000 -- in all errors mode, since this is often a junk message
4002 if not Error_Posted (E) then
4004 ("size clause not allowed for variable length type",
4009 -- Remaining process is to set/verify the representation information,
4010 -- in particular the size and alignment values. This processing is
4011 -- not required for generic types, since generic types do not play
4012 -- any part in code generation, and so the size and alignment values
4013 -- for such types are irrelevant.
4015 if Is_Generic_Type (E) then
4018 -- Otherwise we call the layout procedure
4024 -- End of freeze processing for type entities
4027 -- Here is where we logically freeze the current entity. If it has a
4028 -- freeze node, then this is the point at which the freeze node is
4029 -- linked into the result list.
4031 if Has_Delayed_Freeze (E) then
4033 -- If a freeze node is already allocated, use it, otherwise allocate
4034 -- a new one. The preallocation happens in the case of anonymous base
4035 -- types, where we preallocate so that we can set First_Subtype_Link.
4036 -- Note that we reset the Sloc to the current freeze location.
4038 if Present (Freeze_Node (E)) then
4039 F_Node := Freeze_Node (E);
4040 Set_Sloc (F_Node, Loc);
4043 F_Node := New_Node (N_Freeze_Entity, Loc);
4044 Set_Freeze_Node (E, F_Node);
4045 Set_Access_Types_To_Process (F_Node, No_Elist);
4046 Set_TSS_Elist (F_Node, No_Elist);
4047 Set_Actions (F_Node, No_List);
4050 Set_Entity (F_Node, E);
4052 if Result = No_List then
4053 Result := New_List (F_Node);
4055 Append (F_Node, Result);
4058 -- A final pass over record types with discriminants. If the type
4059 -- has an incomplete declaration, there may be constrained access
4060 -- subtypes declared elsewhere, which do not depend on the discrimi-
4061 -- nants of the type, and which are used as component types (i.e.
4062 -- the full view is a recursive type). The designated types of these
4063 -- subtypes can only be elaborated after the type itself, and they
4064 -- need an itype reference.
4066 if Ekind (E) = E_Record_Type
4067 and then Has_Discriminants (E)
4075 Comp := First_Component (E);
4076 while Present (Comp) loop
4077 Typ := Etype (Comp);
4079 if Ekind (Comp) = E_Component
4080 and then Is_Access_Type (Typ)
4081 and then Scope (Typ) /= E
4082 and then Base_Type (Designated_Type (Typ)) = E
4083 and then Is_Itype (Designated_Type (Typ))
4085 IR := Make_Itype_Reference (Sloc (Comp));
4086 Set_Itype (IR, Designated_Type (Typ));
4087 Append (IR, Result);
4090 Next_Component (Comp);
4096 -- When a type is frozen, the first subtype of the type is frozen as
4097 -- well (RM 13.14(15)). This has to be done after freezing the type,
4098 -- since obviously the first subtype depends on its own base type.
4101 Freeze_And_Append (First_Subtype (E), N, Result);
4103 -- If we just froze a tagged non-class wide record, then freeze the
4104 -- corresponding class-wide type. This must be done after the tagged
4105 -- type itself is frozen, because the class-wide type refers to the
4106 -- tagged type which generates the class.
4108 if Is_Tagged_Type (E)
4109 and then not Is_Class_Wide_Type (E)
4110 and then Present (Class_Wide_Type (E))
4112 Freeze_And_Append (Class_Wide_Type (E), N, Result);
4116 Check_Debug_Info_Needed (E);
4118 -- Special handling for subprograms
4120 if Is_Subprogram (E) then
4122 -- If subprogram has address clause then reset Is_Public flag, since
4123 -- we do not want the backend to generate external references.
4125 if Present (Address_Clause (E))
4126 and then not Is_Library_Level_Entity (E)
4128 Set_Is_Public (E, False);
4130 -- If no address clause and not intrinsic, then for imported
4131 -- subprogram in main unit, generate descriptor if we are in
4132 -- Propagate_Exceptions mode.
4134 elsif Propagate_Exceptions
4135 and then Is_Imported (E)
4136 and then not Is_Intrinsic_Subprogram (E)
4137 and then Convention (E) /= Convention_Stubbed
4139 if Result = No_List then
4140 Result := Empty_List;
4148 -----------------------------
4149 -- Freeze_Enumeration_Type --
4150 -----------------------------
4152 procedure Freeze_Enumeration_Type (Typ : Entity_Id) is
4154 -- By default, if no size clause is present, an enumeration type with
4155 -- Convention C is assumed to interface to a C enum, and has integer
4156 -- size. This applies to types. For subtypes, verify that its base
4157 -- type has no size clause either.
4159 if Has_Foreign_Convention (Typ)
4160 and then not Has_Size_Clause (Typ)
4161 and then not Has_Size_Clause (Base_Type (Typ))
4162 and then Esize (Typ) < Standard_Integer_Size
4164 Init_Esize (Typ, Standard_Integer_Size);
4167 -- If the enumeration type interfaces to C, and it has a size clause
4168 -- that specifies less than int size, it warrants a warning. The
4169 -- user may intend the C type to be an enum or a char, so this is
4170 -- not by itself an error that the Ada compiler can detect, but it
4171 -- it is a worth a heads-up. For Boolean and Character types we
4172 -- assume that the programmer has the proper C type in mind.
4174 if Convention (Typ) = Convention_C
4175 and then Has_Size_Clause (Typ)
4176 and then Esize (Typ) /= Esize (Standard_Integer)
4177 and then not Is_Boolean_Type (Typ)
4178 and then not Is_Character_Type (Typ)
4181 ("C enum types have the size of a C int?", Size_Clause (Typ));
4184 Adjust_Esize_For_Alignment (Typ);
4186 end Freeze_Enumeration_Type;
4188 -----------------------
4189 -- Freeze_Expression --
4190 -----------------------
4192 procedure Freeze_Expression (N : Node_Id) is
4193 In_Spec_Exp : constant Boolean := In_Spec_Expression;
4196 Desig_Typ : Entity_Id;
4200 Freeze_Outside : Boolean := False;
4201 -- This flag is set true if the entity must be frozen outside the
4202 -- current subprogram. This happens in the case of expander generated
4203 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
4204 -- not freeze all entities like other bodies, but which nevertheless
4205 -- may reference entities that have to be frozen before the body and
4206 -- obviously cannot be frozen inside the body.
4208 function In_Exp_Body (N : Node_Id) return Boolean;
4209 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
4210 -- it is the handled statement sequence of an expander-generated
4211 -- subprogram (init proc, stream subprogram, or renaming as body).
4212 -- If so, this is not a freezing context.
4218 function In_Exp_Body (N : Node_Id) return Boolean is
4223 if Nkind (N) = N_Subprogram_Body then
4229 if Nkind (P) /= N_Subprogram_Body then
4233 Id := Defining_Unit_Name (Specification (P));
4235 if Nkind (Id) = N_Defining_Identifier
4236 and then (Is_Init_Proc (Id) or else
4237 Is_TSS (Id, TSS_Stream_Input) or else
4238 Is_TSS (Id, TSS_Stream_Output) or else
4239 Is_TSS (Id, TSS_Stream_Read) or else
4240 Is_TSS (Id, TSS_Stream_Write) or else
4241 Nkind (Original_Node (P)) =
4242 N_Subprogram_Renaming_Declaration)
4251 -- Start of processing for Freeze_Expression
4254 -- Immediate return if freezing is inhibited. This flag is set by the
4255 -- analyzer to stop freezing on generated expressions that would cause
4256 -- freezing if they were in the source program, but which are not
4257 -- supposed to freeze, since they are created.
4259 if Must_Not_Freeze (N) then
4263 -- If expression is non-static, then it does not freeze in a default
4264 -- expression, see section "Handling of Default Expressions" in the
4265 -- spec of package Sem for further details. Note that we have to
4266 -- make sure that we actually have a real expression (if we have
4267 -- a subtype indication, we can't test Is_Static_Expression!)
4270 and then Nkind (N) in N_Subexpr
4271 and then not Is_Static_Expression (N)
4276 -- Freeze type of expression if not frozen already
4280 if Nkind (N) in N_Has_Etype then
4281 if not Is_Frozen (Etype (N)) then
4284 -- Base type may be an derived numeric type that is frozen at
4285 -- the point of declaration, but first_subtype is still unfrozen.
4287 elsif not Is_Frozen (First_Subtype (Etype (N))) then
4288 Typ := First_Subtype (Etype (N));
4292 -- For entity name, freeze entity if not frozen already. A special
4293 -- exception occurs for an identifier that did not come from source.
4294 -- We don't let such identifiers freeze a non-internal entity, i.e.
4295 -- an entity that did come from source, since such an identifier was
4296 -- generated by the expander, and cannot have any semantic effect on
4297 -- the freezing semantics. For example, this stops the parameter of
4298 -- an initialization procedure from freezing the variable.
4300 if Is_Entity_Name (N)
4301 and then not Is_Frozen (Entity (N))
4302 and then (Nkind (N) /= N_Identifier
4303 or else Comes_From_Source (N)
4304 or else not Comes_From_Source (Entity (N)))
4311 -- For an allocator freeze designated type if not frozen already
4313 -- For an aggregate whose component type is an access type, freeze the
4314 -- designated type now, so that its freeze does not appear within the
4315 -- loop that might be created in the expansion of the aggregate. If the
4316 -- designated type is a private type without full view, the expression
4317 -- cannot contain an allocator, so the type is not frozen.
4319 -- For a function, we freeze the entity when the subprogram declaration
4320 -- is frozen, but a function call may appear in an initialization proc.
4321 -- before the declaration is frozen. We need to generate the extra
4322 -- formals, if any, to ensure that the expansion of the call includes
4323 -- the proper actuals. This only applies to Ada subprograms, not to
4330 Desig_Typ := Designated_Type (Etype (N));
4333 if Is_Array_Type (Etype (N))
4334 and then Is_Access_Type (Component_Type (Etype (N)))
4336 Desig_Typ := Designated_Type (Component_Type (Etype (N)));
4339 when N_Selected_Component |
4340 N_Indexed_Component |
4343 if Is_Access_Type (Etype (Prefix (N))) then
4344 Desig_Typ := Designated_Type (Etype (Prefix (N)));
4347 when N_Identifier =>
4349 and then Ekind (Nam) = E_Function
4350 and then Nkind (Parent (N)) = N_Function_Call
4351 and then Convention (Nam) = Convention_Ada
4353 Create_Extra_Formals (Nam);
4360 if Desig_Typ /= Empty
4361 and then (Is_Frozen (Desig_Typ)
4362 or else (not Is_Fully_Defined (Desig_Typ)))
4367 -- All done if nothing needs freezing
4371 and then No (Desig_Typ)
4376 -- Loop for looking at the right place to insert the freeze nodes,
4377 -- exiting from the loop when it is appropriate to insert the freeze
4378 -- node before the current node P.
4380 -- Also checks some special exceptions to the freezing rules. These
4381 -- cases result in a direct return, bypassing the freeze action.
4385 Parent_P := Parent (P);
4387 -- If we don't have a parent, then we are not in a well-formed tree.
4388 -- This is an unusual case, but there are some legitimate situations
4389 -- in which this occurs, notably when the expressions in the range of
4390 -- a type declaration are resolved. We simply ignore the freeze
4391 -- request in this case. Is this right ???
4393 if No (Parent_P) then
4397 -- See if we have got to an appropriate point in the tree
4399 case Nkind (Parent_P) is
4401 -- A special test for the exception of (RM 13.14(8)) for the case
4402 -- of per-object expressions (RM 3.8(18)) occurring in component
4403 -- definition or a discrete subtype definition. Note that we test
4404 -- for a component declaration which includes both cases we are
4405 -- interested in, and furthermore the tree does not have explicit
4406 -- nodes for either of these two constructs.
4408 when N_Component_Declaration =>
4410 -- The case we want to test for here is an identifier that is
4411 -- a per-object expression, this is either a discriminant that
4412 -- appears in a context other than the component declaration
4413 -- or it is a reference to the type of the enclosing construct.
4415 -- For either of these cases, we skip the freezing
4417 if not In_Spec_Expression
4418 and then Nkind (N) = N_Identifier
4419 and then (Present (Entity (N)))
4421 -- We recognize the discriminant case by just looking for
4422 -- a reference to a discriminant. It can only be one for
4423 -- the enclosing construct. Skip freezing in this case.
4425 if Ekind (Entity (N)) = E_Discriminant then
4428 -- For the case of a reference to the enclosing record,
4429 -- (or task or protected type), we look for a type that
4430 -- matches the current scope.
4432 elsif Entity (N) = Current_Scope then
4437 -- If we have an enumeration literal that appears as the choice in
4438 -- the aggregate of an enumeration representation clause, then
4439 -- freezing does not occur (RM 13.14(10)).
4441 when N_Enumeration_Representation_Clause =>
4443 -- The case we are looking for is an enumeration literal
4445 if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal)
4446 and then Is_Enumeration_Type (Etype (N))
4448 -- If enumeration literal appears directly as the choice,
4449 -- do not freeze (this is the normal non-overloaded case)
4451 if Nkind (Parent (N)) = N_Component_Association
4452 and then First (Choices (Parent (N))) = N
4456 -- If enumeration literal appears as the name of function
4457 -- which is the choice, then also do not freeze. This
4458 -- happens in the overloaded literal case, where the
4459 -- enumeration literal is temporarily changed to a function
4460 -- call for overloading analysis purposes.
4462 elsif Nkind (Parent (N)) = N_Function_Call
4464 Nkind (Parent (Parent (N))) = N_Component_Association
4466 First (Choices (Parent (Parent (N)))) = Parent (N)
4472 -- Normally if the parent is a handled sequence of statements,
4473 -- then the current node must be a statement, and that is an
4474 -- appropriate place to insert a freeze node.
4476 when N_Handled_Sequence_Of_Statements =>
4478 -- An exception occurs when the sequence of statements is for
4479 -- an expander generated body that did not do the usual freeze
4480 -- all operation. In this case we usually want to freeze
4481 -- outside this body, not inside it, and we skip past the
4482 -- subprogram body that we are inside.
4484 if In_Exp_Body (Parent_P) then
4486 -- However, we *do* want to freeze at this point if we have
4487 -- an entity to freeze, and that entity is declared *inside*
4488 -- the body of the expander generated procedure. This case
4489 -- is recognized by the scope of the type, which is either
4490 -- the spec for some enclosing body, or (in the case of
4491 -- init_procs, for which there are no separate specs) the
4495 Subp : constant Node_Id := Parent (Parent_P);
4499 if Nkind (Subp) = N_Subprogram_Body then
4500 Cspc := Corresponding_Spec (Subp);
4502 if (Present (Typ) and then Scope (Typ) = Cspc)
4504 (Present (Nam) and then Scope (Nam) = Cspc)
4509 and then Scope (Typ) = Current_Scope
4510 and then Current_Scope = Defining_Entity (Subp)
4517 -- If not that exception to the exception, then this is
4518 -- where we delay the freeze till outside the body.
4520 Parent_P := Parent (Parent_P);
4521 Freeze_Outside := True;
4523 -- Here if normal case where we are in handled statement
4524 -- sequence and want to do the insertion right there.
4530 -- If parent is a body or a spec or a block, then the current node
4531 -- is a statement or declaration and we can insert the freeze node
4534 when N_Package_Specification |
4540 N_Block_Statement => exit;
4542 -- The expander is allowed to define types in any statements list,
4543 -- so any of the following parent nodes also mark a freezing point
4544 -- if the actual node is in a list of statements or declarations.
4546 when N_Exception_Handler |
4549 N_Case_Statement_Alternative |
4550 N_Compilation_Unit_Aux |
4551 N_Selective_Accept |
4552 N_Accept_Alternative |
4553 N_Delay_Alternative |
4554 N_Conditional_Entry_Call |
4555 N_Entry_Call_Alternative |
4556 N_Triggering_Alternative |
4562 exit when Is_List_Member (P);
4564 -- Note: The N_Loop_Statement is a special case. A type that
4565 -- appears in the source can never be frozen in a loop (this
4566 -- occurs only because of a loop expanded by the expander), so we
4567 -- keep on going. Otherwise we terminate the search. Same is true
4568 -- of any entity which comes from source. (if they have predefined
4569 -- type, that type does not appear to come from source, but the
4570 -- entity should not be frozen here).
4572 when N_Loop_Statement =>
4573 exit when not Comes_From_Source (Etype (N))
4574 and then (No (Nam) or else not Comes_From_Source (Nam));
4576 -- For all other cases, keep looking at parents
4582 -- We fall through the case if we did not yet find the proper
4583 -- place in the free for inserting the freeze node, so climb!
4588 -- If the expression appears in a record or an initialization procedure,
4589 -- the freeze nodes are collected and attached to the current scope, to
4590 -- be inserted and analyzed on exit from the scope, to insure that
4591 -- generated entities appear in the correct scope. If the expression is
4592 -- a default for a discriminant specification, the scope is still void.
4593 -- The expression can also appear in the discriminant part of a private
4594 -- or concurrent type.
4596 -- If the expression appears in a constrained subcomponent of an
4597 -- enclosing record declaration, the freeze nodes must be attached to
4598 -- the outer record type so they can eventually be placed in the
4599 -- enclosing declaration list.
4601 -- The other case requiring this special handling is if we are in a
4602 -- default expression, since in that case we are about to freeze a
4603 -- static type, and the freeze scope needs to be the outer scope, not
4604 -- the scope of the subprogram with the default parameter.
4606 -- For default expressions and other spec expressions in generic units,
4607 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
4608 -- placing them at the proper place, after the generic unit.
4610 if (In_Spec_Exp and not Inside_A_Generic)
4611 or else Freeze_Outside
4612 or else (Is_Type (Current_Scope)
4613 and then (not Is_Concurrent_Type (Current_Scope)
4614 or else not Has_Completion (Current_Scope)))
4615 or else Ekind (Current_Scope) = E_Void
4618 N : constant Node_Id := Current_Scope;
4619 Freeze_Nodes : List_Id := No_List;
4620 Pos : Int := Scope_Stack.Last;
4623 if Present (Desig_Typ) then
4624 Freeze_And_Append (Desig_Typ, N, Freeze_Nodes);
4627 if Present (Typ) then
4628 Freeze_And_Append (Typ, N, Freeze_Nodes);
4631 if Present (Nam) then
4632 Freeze_And_Append (Nam, N, Freeze_Nodes);
4635 -- The current scope may be that of a constrained component of
4636 -- an enclosing record declaration, which is above the current
4637 -- scope in the scope stack.
4638 -- If the expression is within a top-level pragma, as for a pre-
4639 -- condition on a library-level subprogram, nothing to do.
4641 if not Is_Compilation_Unit (Current_Scope)
4642 and then Is_Record_Type (Scope (Current_Scope))
4647 if Is_Non_Empty_List (Freeze_Nodes) then
4648 if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then
4649 Scope_Stack.Table (Pos).Pending_Freeze_Actions :=
4652 Append_List (Freeze_Nodes,
4653 Scope_Stack.Table (Pos).Pending_Freeze_Actions);
4661 -- Now we have the right place to do the freezing. First, a special
4662 -- adjustment, if we are in spec-expression analysis mode, these freeze
4663 -- actions must not be thrown away (normally all inserted actions are
4664 -- thrown away in this mode. However, the freeze actions are from static
4665 -- expressions and one of the important reasons we are doing this
4666 -- special analysis is to get these freeze actions. Therefore we turn
4667 -- off the In_Spec_Expression mode to propagate these freeze actions.
4668 -- This also means they get properly analyzed and expanded.
4670 In_Spec_Expression := False;
4672 -- Freeze the designated type of an allocator (RM 13.14(13))
4674 if Present (Desig_Typ) then
4675 Freeze_Before (P, Desig_Typ);
4678 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
4679 -- the enumeration representation clause exception in the loop above.
4681 if Present (Typ) then
4682 Freeze_Before (P, Typ);
4685 -- Freeze name if one is present (RM 13.14(11))
4687 if Present (Nam) then
4688 Freeze_Before (P, Nam);
4691 -- Restore In_Spec_Expression flag
4693 In_Spec_Expression := In_Spec_Exp;
4694 end Freeze_Expression;
4696 -----------------------------
4697 -- Freeze_Fixed_Point_Type --
4698 -----------------------------
4700 -- Certain fixed-point types and subtypes, including implicit base types
4701 -- and declared first subtypes, have not yet set up a range. This is
4702 -- because the range cannot be set until the Small and Size values are
4703 -- known, and these are not known till the type is frozen.
4705 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
4706 -- whose bounds are unanalyzed real literals. This routine will recognize
4707 -- this case, and transform this range node into a properly typed range
4708 -- with properly analyzed and resolved values.
4710 procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is
4711 Rng : constant Node_Id := Scalar_Range (Typ);
4712 Lo : constant Node_Id := Low_Bound (Rng);
4713 Hi : constant Node_Id := High_Bound (Rng);
4714 Btyp : constant Entity_Id := Base_Type (Typ);
4715 Brng : constant Node_Id := Scalar_Range (Btyp);
4716 BLo : constant Node_Id := Low_Bound (Brng);
4717 BHi : constant Node_Id := High_Bound (Brng);
4718 Small : constant Ureal := Small_Value (Typ);
4725 function Fsize (Lov, Hiv : Ureal) return Nat;
4726 -- Returns size of type with given bounds. Also leaves these
4727 -- bounds set as the current bounds of the Typ.
4733 function Fsize (Lov, Hiv : Ureal) return Nat is
4735 Set_Realval (Lo, Lov);
4736 Set_Realval (Hi, Hiv);
4737 return Minimum_Size (Typ);
4740 -- Start of processing for Freeze_Fixed_Point_Type
4743 -- If Esize of a subtype has not previously been set, set it now
4745 if Unknown_Esize (Typ) then
4746 Atype := Ancestor_Subtype (Typ);
4748 if Present (Atype) then
4749 Set_Esize (Typ, Esize (Atype));
4751 Set_Esize (Typ, Esize (Base_Type (Typ)));
4755 -- Immediate return if the range is already analyzed. This means that
4756 -- the range is already set, and does not need to be computed by this
4759 if Analyzed (Rng) then
4763 -- Immediate return if either of the bounds raises Constraint_Error
4765 if Raises_Constraint_Error (Lo)
4766 or else Raises_Constraint_Error (Hi)
4771 Loval := Realval (Lo);
4772 Hival := Realval (Hi);
4774 -- Ordinary fixed-point case
4776 if Is_Ordinary_Fixed_Point_Type (Typ) then
4778 -- For the ordinary fixed-point case, we are allowed to fudge the
4779 -- end-points up or down by small. Generally we prefer to fudge up,
4780 -- i.e. widen the bounds for non-model numbers so that the end points
4781 -- are included. However there are cases in which this cannot be
4782 -- done, and indeed cases in which we may need to narrow the bounds.
4783 -- The following circuit makes the decision.
4785 -- Note: our terminology here is that Incl_EP means that the bounds
4786 -- are widened by Small if necessary to include the end points, and
4787 -- Excl_EP means that the bounds are narrowed by Small to exclude the
4788 -- end-points if this reduces the size.
4790 -- Note that in the Incl case, all we care about is including the
4791 -- end-points. In the Excl case, we want to narrow the bounds as
4792 -- much as permitted by the RM, to give the smallest possible size.
4795 Loval_Incl_EP : Ureal;
4796 Hival_Incl_EP : Ureal;
4798 Loval_Excl_EP : Ureal;
4799 Hival_Excl_EP : Ureal;
4805 First_Subt : Entity_Id;
4810 -- First step. Base types are required to be symmetrical. Right
4811 -- now, the base type range is a copy of the first subtype range.
4812 -- This will be corrected before we are done, but right away we
4813 -- need to deal with the case where both bounds are non-negative.
4814 -- In this case, we set the low bound to the negative of the high
4815 -- bound, to make sure that the size is computed to include the
4816 -- required sign. Note that we do not need to worry about the
4817 -- case of both bounds negative, because the sign will be dealt
4818 -- with anyway. Furthermore we can't just go making such a bound
4819 -- symmetrical, since in a twos-complement system, there is an
4820 -- extra negative value which could not be accommodated on the
4824 and then not UR_Is_Negative (Loval)
4825 and then Hival > Loval
4828 Set_Realval (Lo, Loval);
4831 -- Compute the fudged bounds. If the number is a model number,
4832 -- then we do nothing to include it, but we are allowed to backoff
4833 -- to the next adjacent model number when we exclude it. If it is
4834 -- not a model number then we straddle the two values with the
4835 -- model numbers on either side.
4837 Model_Num := UR_Trunc (Loval / Small) * Small;
4839 if Loval = Model_Num then
4840 Loval_Incl_EP := Model_Num;
4842 Loval_Incl_EP := Model_Num - Small;
4845 -- The low value excluding the end point is Small greater, but
4846 -- we do not do this exclusion if the low value is positive,
4847 -- since it can't help the size and could actually hurt by
4848 -- crossing the high bound.
4850 if UR_Is_Negative (Loval_Incl_EP) then
4851 Loval_Excl_EP := Loval_Incl_EP + Small;
4853 -- If the value went from negative to zero, then we have the
4854 -- case where Loval_Incl_EP is the model number just below
4855 -- zero, so we want to stick to the negative value for the
4856 -- base type to maintain the condition that the size will
4857 -- include signed values.
4860 and then UR_Is_Zero (Loval_Excl_EP)
4862 Loval_Excl_EP := Loval_Incl_EP;
4866 Loval_Excl_EP := Loval_Incl_EP;
4869 -- Similar processing for upper bound and high value
4871 Model_Num := UR_Trunc (Hival / Small) * Small;
4873 if Hival = Model_Num then
4874 Hival_Incl_EP := Model_Num;
4876 Hival_Incl_EP := Model_Num + Small;
4879 if UR_Is_Positive (Hival_Incl_EP) then
4880 Hival_Excl_EP := Hival_Incl_EP - Small;
4882 Hival_Excl_EP := Hival_Incl_EP;
4885 -- One further adjustment is needed. In the case of subtypes, we
4886 -- cannot go outside the range of the base type, or we get
4887 -- peculiarities, and the base type range is already set. This
4888 -- only applies to the Incl values, since clearly the Excl values
4889 -- are already as restricted as they are allowed to be.
4892 Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo));
4893 Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi));
4896 -- Get size including and excluding end points
4898 Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP);
4899 Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP);
4901 -- No need to exclude end-points if it does not reduce size
4903 if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then
4904 Loval_Excl_EP := Loval_Incl_EP;
4907 if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then
4908 Hival_Excl_EP := Hival_Incl_EP;
4911 -- Now we set the actual size to be used. We want to use the
4912 -- bounds fudged up to include the end-points but only if this
4913 -- can be done without violating a specifically given size
4914 -- size clause or causing an unacceptable increase in size.
4916 -- Case of size clause given
4918 if Has_Size_Clause (Typ) then
4920 -- Use the inclusive size only if it is consistent with
4921 -- the explicitly specified size.
4923 if Size_Incl_EP <= RM_Size (Typ) then
4924 Actual_Lo := Loval_Incl_EP;
4925 Actual_Hi := Hival_Incl_EP;
4926 Actual_Size := Size_Incl_EP;
4928 -- If the inclusive size is too large, we try excluding
4929 -- the end-points (will be caught later if does not work).
4932 Actual_Lo := Loval_Excl_EP;
4933 Actual_Hi := Hival_Excl_EP;
4934 Actual_Size := Size_Excl_EP;
4937 -- Case of size clause not given
4940 -- If we have a base type whose corresponding first subtype
4941 -- has an explicit size that is large enough to include our
4942 -- end-points, then do so. There is no point in working hard
4943 -- to get a base type whose size is smaller than the specified
4944 -- size of the first subtype.
4946 First_Subt := First_Subtype (Typ);
4948 if Has_Size_Clause (First_Subt)
4949 and then Size_Incl_EP <= Esize (First_Subt)
4951 Actual_Size := Size_Incl_EP;
4952 Actual_Lo := Loval_Incl_EP;
4953 Actual_Hi := Hival_Incl_EP;
4955 -- If excluding the end-points makes the size smaller and
4956 -- results in a size of 8,16,32,64, then we take the smaller
4957 -- size. For the 64 case, this is compulsory. For the other
4958 -- cases, it seems reasonable. We like to include end points
4959 -- if we can, but not at the expense of moving to the next
4960 -- natural boundary of size.
4962 elsif Size_Incl_EP /= Size_Excl_EP
4963 and then Addressable (Size_Excl_EP)
4965 Actual_Size := Size_Excl_EP;
4966 Actual_Lo := Loval_Excl_EP;
4967 Actual_Hi := Hival_Excl_EP;
4969 -- Otherwise we can definitely include the end points
4972 Actual_Size := Size_Incl_EP;
4973 Actual_Lo := Loval_Incl_EP;
4974 Actual_Hi := Hival_Incl_EP;
4977 -- One pathological case: normally we never fudge a low bound
4978 -- down, since it would seem to increase the size (if it has
4979 -- any effect), but for ranges containing single value, or no
4980 -- values, the high bound can be small too large. Consider:
4982 -- type t is delta 2.0**(-14)
4983 -- range 131072.0 .. 0;
4985 -- That lower bound is *just* outside the range of 32 bits, and
4986 -- does need fudging down in this case. Note that the bounds
4987 -- will always have crossed here, since the high bound will be
4988 -- fudged down if necessary, as in the case of:
4990 -- type t is delta 2.0**(-14)
4991 -- range 131072.0 .. 131072.0;
4993 -- So we detect the situation by looking for crossed bounds,
4994 -- and if the bounds are crossed, and the low bound is greater
4995 -- than zero, we will always back it off by small, since this
4996 -- is completely harmless.
4998 if Actual_Lo > Actual_Hi then
4999 if UR_Is_Positive (Actual_Lo) then
5000 Actual_Lo := Loval_Incl_EP - Small;
5001 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5003 -- And of course, we need to do exactly the same parallel
5004 -- fudge for flat ranges in the negative region.
5006 elsif UR_Is_Negative (Actual_Hi) then
5007 Actual_Hi := Hival_Incl_EP + Small;
5008 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5013 Set_Realval (Lo, Actual_Lo);
5014 Set_Realval (Hi, Actual_Hi);
5017 -- For the decimal case, none of this fudging is required, since there
5018 -- are no end-point problems in the decimal case (the end-points are
5019 -- always included).
5022 Actual_Size := Fsize (Loval, Hival);
5025 -- At this stage, the actual size has been calculated and the proper
5026 -- required bounds are stored in the low and high bounds.
5028 if Actual_Size > 64 then
5029 Error_Msg_Uint_1 := UI_From_Int (Actual_Size);
5031 ("size required (^) for type& too large, maximum allowed is 64",
5036 -- Check size against explicit given size
5038 if Has_Size_Clause (Typ) then
5039 if Actual_Size > RM_Size (Typ) then
5040 Error_Msg_Uint_1 := RM_Size (Typ);
5041 Error_Msg_Uint_2 := UI_From_Int (Actual_Size);
5043 ("size given (^) for type& too small, minimum allowed is ^",
5044 Size_Clause (Typ), Typ);
5047 Actual_Size := UI_To_Int (Esize (Typ));
5050 -- Increase size to next natural boundary if no size clause given
5053 if Actual_Size <= 8 then
5055 elsif Actual_Size <= 16 then
5057 elsif Actual_Size <= 32 then
5063 Init_Esize (Typ, Actual_Size);
5064 Adjust_Esize_For_Alignment (Typ);
5067 -- If we have a base type, then expand the bounds so that they extend to
5068 -- the full width of the allocated size in bits, to avoid junk range
5069 -- checks on intermediate computations.
5071 if Base_Type (Typ) = Typ then
5072 Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1))));
5073 Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1)));
5076 -- Final step is to reanalyze the bounds using the proper type
5077 -- and set the Corresponding_Integer_Value fields of the literals.
5079 Set_Etype (Lo, Empty);
5080 Set_Analyzed (Lo, False);
5083 -- Resolve with universal fixed if the base type, and the base type if
5084 -- it is a subtype. Note we can't resolve the base type with itself,
5085 -- that would be a reference before definition.
5088 Resolve (Lo, Universal_Fixed);
5093 -- Set corresponding integer value for bound
5095 Set_Corresponding_Integer_Value
5096 (Lo, UR_To_Uint (Realval (Lo) / Small));
5098 -- Similar processing for high bound
5100 Set_Etype (Hi, Empty);
5101 Set_Analyzed (Hi, False);
5105 Resolve (Hi, Universal_Fixed);
5110 Set_Corresponding_Integer_Value
5111 (Hi, UR_To_Uint (Realval (Hi) / Small));
5113 -- Set type of range to correspond to bounds
5115 Set_Etype (Rng, Etype (Lo));
5117 -- Set Esize to calculated size if not set already
5119 if Unknown_Esize (Typ) then
5120 Init_Esize (Typ, Actual_Size);
5123 -- Set RM_Size if not already set. If already set, check value
5126 Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ));
5129 if RM_Size (Typ) /= Uint_0 then
5130 if RM_Size (Typ) < Minsiz then
5131 Error_Msg_Uint_1 := RM_Size (Typ);
5132 Error_Msg_Uint_2 := Minsiz;
5134 ("size given (^) for type& too small, minimum allowed is ^",
5135 Size_Clause (Typ), Typ);
5139 Set_RM_Size (Typ, Minsiz);
5142 end Freeze_Fixed_Point_Type;
5148 procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is
5152 Set_Has_Delayed_Freeze (T);
5153 L := Freeze_Entity (T, N);
5155 if Is_Non_Empty_List (L) then
5156 Insert_Actions (N, L);
5160 --------------------------
5161 -- Freeze_Static_Object --
5162 --------------------------
5164 procedure Freeze_Static_Object (E : Entity_Id) is
5166 Cannot_Be_Static : exception;
5167 -- Exception raised if the type of a static object cannot be made
5168 -- static. This happens if the type depends on non-global objects.
5170 procedure Ensure_Expression_Is_SA (N : Node_Id);
5171 -- Called to ensure that an expression used as part of a type definition
5172 -- is statically allocatable, which means that the expression type is
5173 -- statically allocatable, and the expression is either static, or a
5174 -- reference to a library level constant.
5176 procedure Ensure_Type_Is_SA (Typ : Entity_Id);
5177 -- Called to mark a type as static, checking that it is possible
5178 -- to set the type as static. If it is not possible, then the
5179 -- exception Cannot_Be_Static is raised.
5181 -----------------------------
5182 -- Ensure_Expression_Is_SA --
5183 -----------------------------
5185 procedure Ensure_Expression_Is_SA (N : Node_Id) is
5189 Ensure_Type_Is_SA (Etype (N));
5191 if Is_Static_Expression (N) then
5194 elsif Nkind (N) = N_Identifier then
5198 and then Ekind (Ent) = E_Constant
5199 and then Is_Library_Level_Entity (Ent)
5205 raise Cannot_Be_Static;
5206 end Ensure_Expression_Is_SA;
5208 -----------------------
5209 -- Ensure_Type_Is_SA --
5210 -----------------------
5212 procedure Ensure_Type_Is_SA (Typ : Entity_Id) is
5217 -- If type is library level, we are all set
5219 if Is_Library_Level_Entity (Typ) then
5223 -- We are also OK if the type already marked as statically allocated,
5224 -- which means we processed it before.
5226 if Is_Statically_Allocated (Typ) then
5230 -- Mark type as statically allocated
5232 Set_Is_Statically_Allocated (Typ);
5234 -- Check that it is safe to statically allocate this type
5236 if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then
5237 Ensure_Expression_Is_SA (Type_Low_Bound (Typ));
5238 Ensure_Expression_Is_SA (Type_High_Bound (Typ));
5240 elsif Is_Array_Type (Typ) then
5241 N := First_Index (Typ);
5242 while Present (N) loop
5243 Ensure_Type_Is_SA (Etype (N));
5247 Ensure_Type_Is_SA (Component_Type (Typ));
5249 elsif Is_Access_Type (Typ) then
5250 if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then
5254 T : constant Entity_Id := Etype (Designated_Type (Typ));
5257 if T /= Standard_Void_Type then
5258 Ensure_Type_Is_SA (T);
5261 F := First_Formal (Designated_Type (Typ));
5262 while Present (F) loop
5263 Ensure_Type_Is_SA (Etype (F));
5269 Ensure_Type_Is_SA (Designated_Type (Typ));
5272 elsif Is_Record_Type (Typ) then
5273 C := First_Entity (Typ);
5274 while Present (C) loop
5275 if Ekind (C) = E_Discriminant
5276 or else Ekind (C) = E_Component
5278 Ensure_Type_Is_SA (Etype (C));
5280 elsif Is_Type (C) then
5281 Ensure_Type_Is_SA (C);
5287 elsif Ekind (Typ) = E_Subprogram_Type then
5288 Ensure_Type_Is_SA (Etype (Typ));
5290 C := First_Formal (Typ);
5291 while Present (C) loop
5292 Ensure_Type_Is_SA (Etype (C));
5297 raise Cannot_Be_Static;
5299 end Ensure_Type_Is_SA;
5301 -- Start of processing for Freeze_Static_Object
5304 Ensure_Type_Is_SA (Etype (E));
5307 when Cannot_Be_Static =>
5309 -- If the object that cannot be static is imported or exported, then
5310 -- issue an error message saying that this object cannot be imported
5311 -- or exported. If it has an address clause it is an overlay in the
5312 -- current partition and the static requirement is not relevant.
5313 -- Do not issue any error message when ignoring rep clauses.
5315 if Ignore_Rep_Clauses then
5318 elsif Is_Imported (E) then
5319 if No (Address_Clause (E)) then
5321 ("& cannot be imported (local type is not constant)", E);
5324 -- Otherwise must be exported, something is wrong if compiler
5325 -- is marking something as statically allocated which cannot be).
5327 else pragma Assert (Is_Exported (E));
5329 ("& cannot be exported (local type is not constant)", E);
5331 end Freeze_Static_Object;
5333 -----------------------
5334 -- Freeze_Subprogram --
5335 -----------------------
5337 procedure Freeze_Subprogram (E : Entity_Id) is
5342 -- Subprogram may not have an address clause unless it is imported
5344 if Present (Address_Clause (E)) then
5345 if not Is_Imported (E) then
5347 ("address clause can only be given " &
5348 "for imported subprogram",
5349 Name (Address_Clause (E)));
5353 -- Reset the Pure indication on an imported subprogram unless an
5354 -- explicit Pure_Function pragma was present. We do this because
5355 -- otherwise it is an insidious error to call a non-pure function from
5356 -- pure unit and have calls mysteriously optimized away. What happens
5357 -- here is that the Import can bypass the normal check to ensure that
5358 -- pure units call only pure subprograms.
5361 and then Is_Pure (E)
5362 and then not Has_Pragma_Pure_Function (E)
5364 Set_Is_Pure (E, False);
5367 -- For non-foreign convention subprograms, this is where we create
5368 -- the extra formals (for accessibility level and constrained bit
5369 -- information). We delay this till the freeze point precisely so
5370 -- that we know the convention!
5372 if not Has_Foreign_Convention (E) then
5373 Create_Extra_Formals (E);
5376 -- If this is convention Ada and a Valued_Procedure, that's odd
5378 if Ekind (E) = E_Procedure
5379 and then Is_Valued_Procedure (E)
5380 and then Convention (E) = Convention_Ada
5381 and then Warn_On_Export_Import
5384 ("?Valued_Procedure has no effect for convention Ada", E);
5385 Set_Is_Valued_Procedure (E, False);
5388 -- Case of foreign convention
5393 -- For foreign conventions, warn about return of an
5394 -- unconstrained array.
5396 -- Note: we *do* allow a return by descriptor for the VMS case,
5397 -- though here there is probably more to be done ???
5399 if Ekind (E) = E_Function then
5400 Retype := Underlying_Type (Etype (E));
5402 -- If no return type, probably some other error, e.g. a
5403 -- missing full declaration, so ignore.
5408 -- If the return type is generic, we have emitted a warning
5409 -- earlier on, and there is nothing else to check here. Specific
5410 -- instantiations may lead to erroneous behavior.
5412 elsif Is_Generic_Type (Etype (E)) then
5415 -- Display warning if returning unconstrained array
5417 elsif Is_Array_Type (Retype)
5418 and then not Is_Constrained (Retype)
5420 -- Exclude cases where descriptor mechanism is set, since the
5421 -- VMS descriptor mechanisms allow such unconstrained returns.
5423 and then Mechanism (E) not in Descriptor_Codes
5425 -- Check appropriate warning is enabled (should we check for
5426 -- Warnings (Off) on specific entities here, probably so???)
5428 and then Warn_On_Export_Import
5430 -- Exclude the VM case, since return of unconstrained arrays
5431 -- is properly handled in both the JVM and .NET cases.
5433 and then VM_Target = No_VM
5436 ("?foreign convention function& should not return " &
5437 "unconstrained array", E);
5442 -- If any of the formals for an exported foreign convention
5443 -- subprogram have defaults, then emit an appropriate warning since
5444 -- this is odd (default cannot be used from non-Ada code)
5446 if Is_Exported (E) then
5447 F := First_Formal (E);
5448 while Present (F) loop
5449 if Warn_On_Export_Import
5450 and then Present (Default_Value (F))
5453 ("?parameter cannot be defaulted in non-Ada call",
5462 -- For VMS, descriptor mechanisms for parameters are allowed only for
5463 -- imported/exported subprograms. Moreover, the NCA descriptor is not
5464 -- allowed for parameters of exported subprograms.
5466 if OpenVMS_On_Target then
5467 if Is_Exported (E) then
5468 F := First_Formal (E);
5469 while Present (F) loop
5470 if Mechanism (F) = By_Descriptor_NCA then
5472 ("'N'C'A' descriptor for parameter not permitted", F);
5474 ("\can only be used for imported subprogram", F);
5480 elsif not Is_Imported (E) then
5481 F := First_Formal (E);
5482 while Present (F) loop
5483 if Mechanism (F) in Descriptor_Codes then
5485 ("descriptor mechanism for parameter not permitted", F);
5487 ("\can only be used for imported/exported subprogram", F);
5495 -- Pragma Inline_Always is disallowed for dispatching subprograms
5496 -- because the address of such subprograms is saved in the dispatch
5497 -- table to support dispatching calls, and dispatching calls cannot
5498 -- be inlined. This is consistent with the restriction against using
5499 -- 'Access or 'Address on an Inline_Always subprogram.
5501 if Is_Dispatching_Operation (E)
5502 and then Has_Pragma_Inline_Always (E)
5505 ("pragma Inline_Always not allowed for dispatching subprograms", E);
5508 -- Because of the implicit representation of inherited predefined
5509 -- operators in the front-end, the overriding status of the operation
5510 -- may be affected when a full view of a type is analyzed, and this is
5511 -- not captured by the analysis of the corresponding type declaration.
5512 -- Therefore the correctness of a not-overriding indicator must be
5513 -- rechecked when the subprogram is frozen.
5515 if Nkind (E) = N_Defining_Operator_Symbol
5516 and then not Error_Posted (Parent (E))
5518 Check_Overriding_Indicator (E, Empty, Is_Primitive (E));
5520 end Freeze_Subprogram;
5522 ----------------------
5523 -- Is_Fully_Defined --
5524 ----------------------
5526 function Is_Fully_Defined (T : Entity_Id) return Boolean is
5528 if Ekind (T) = E_Class_Wide_Type then
5529 return Is_Fully_Defined (Etype (T));
5531 elsif Is_Array_Type (T) then
5532 return Is_Fully_Defined (Component_Type (T));
5534 elsif Is_Record_Type (T)
5535 and not Is_Private_Type (T)
5537 -- Verify that the record type has no components with private types
5538 -- without completion.
5544 Comp := First_Component (T);
5545 while Present (Comp) loop
5546 if not Is_Fully_Defined (Etype (Comp)) then
5550 Next_Component (Comp);
5555 -- For the designated type of an access to subprogram, all types in
5556 -- the profile must be fully defined.
5558 elsif Ekind (T) = E_Subprogram_Type then
5563 F := First_Formal (T);
5564 while Present (F) loop
5565 if not Is_Fully_Defined (Etype (F)) then
5572 return Is_Fully_Defined (Etype (T));
5576 return not Is_Private_Type (T)
5577 or else Present (Full_View (Base_Type (T)));
5579 end Is_Fully_Defined;
5581 ---------------------------------
5582 -- Process_Default_Expressions --
5583 ---------------------------------
5585 procedure Process_Default_Expressions
5587 After : in out Node_Id)
5589 Loc : constant Source_Ptr := Sloc (E);
5596 Set_Default_Expressions_Processed (E);
5598 -- A subprogram instance and its associated anonymous subprogram share
5599 -- their signature. The default expression functions are defined in the
5600 -- wrapper packages for the anonymous subprogram, and should not be
5601 -- generated again for the instance.
5603 if Is_Generic_Instance (E)
5604 and then Present (Alias (E))
5605 and then Default_Expressions_Processed (Alias (E))
5610 Formal := First_Formal (E);
5611 while Present (Formal) loop
5612 if Present (Default_Value (Formal)) then
5614 -- We work with a copy of the default expression because we
5615 -- do not want to disturb the original, since this would mess
5616 -- up the conformance checking.
5618 Dcopy := New_Copy_Tree (Default_Value (Formal));
5620 -- The analysis of the expression may generate insert actions,
5621 -- which of course must not be executed. We wrap those actions
5622 -- in a procedure that is not called, and later on eliminated.
5623 -- The following cases have no side-effects, and are analyzed
5626 if Nkind (Dcopy) = N_Identifier
5627 or else Nkind (Dcopy) = N_Expanded_Name
5628 or else Nkind (Dcopy) = N_Integer_Literal
5629 or else (Nkind (Dcopy) = N_Real_Literal
5630 and then not Vax_Float (Etype (Dcopy)))
5631 or else Nkind (Dcopy) = N_Character_Literal
5632 or else Nkind (Dcopy) = N_String_Literal
5633 or else Known_Null (Dcopy)
5634 or else (Nkind (Dcopy) = N_Attribute_Reference
5636 Attribute_Name (Dcopy) = Name_Null_Parameter)
5639 -- If there is no default function, we must still do a full
5640 -- analyze call on the default value, to ensure that all error
5641 -- checks are performed, e.g. those associated with static
5642 -- evaluation. Note: this branch will always be taken if the
5643 -- analyzer is turned off (but we still need the error checks).
5645 -- Note: the setting of parent here is to meet the requirement
5646 -- that we can only analyze the expression while attached to
5647 -- the tree. Really the requirement is that the parent chain
5648 -- be set, we don't actually need to be in the tree.
5650 Set_Parent (Dcopy, Declaration_Node (Formal));
5653 -- Default expressions are resolved with their own type if the
5654 -- context is generic, to avoid anomalies with private types.
5656 if Ekind (Scope (E)) = E_Generic_Package then
5659 Resolve (Dcopy, Etype (Formal));
5662 -- If that resolved expression will raise constraint error,
5663 -- then flag the default value as raising constraint error.
5664 -- This allows a proper error message on the calls.
5666 if Raises_Constraint_Error (Dcopy) then
5667 Set_Raises_Constraint_Error (Default_Value (Formal));
5670 -- If the default is a parameterless call, we use the name of
5671 -- the called function directly, and there is no body to build.
5673 elsif Nkind (Dcopy) = N_Function_Call
5674 and then No (Parameter_Associations (Dcopy))
5678 -- Else construct and analyze the body of a wrapper procedure
5679 -- that contains an object declaration to hold the expression.
5680 -- Given that this is done only to complete the analysis, it
5681 -- simpler to build a procedure than a function which might
5682 -- involve secondary stack expansion.
5685 Dnam := Make_Temporary (Loc, 'D');
5688 Make_Subprogram_Body (Loc,
5690 Make_Procedure_Specification (Loc,
5691 Defining_Unit_Name => Dnam),
5693 Declarations => New_List (
5694 Make_Object_Declaration (Loc,
5695 Defining_Identifier =>
5696 Make_Defining_Identifier (Loc,
5697 New_Internal_Name ('T')),
5698 Object_Definition =>
5699 New_Occurrence_Of (Etype (Formal), Loc),
5700 Expression => New_Copy_Tree (Dcopy))),
5702 Handled_Statement_Sequence =>
5703 Make_Handled_Sequence_Of_Statements (Loc,
5704 Statements => New_List));
5706 Set_Scope (Dnam, Scope (E));
5707 Set_Assignment_OK (First (Declarations (Dbody)));
5708 Set_Is_Eliminated (Dnam);
5709 Insert_After (After, Dbody);
5715 Next_Formal (Formal);
5717 end Process_Default_Expressions;
5719 ----------------------------------------
5720 -- Set_Component_Alignment_If_Not_Set --
5721 ----------------------------------------
5723 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is
5725 -- Ignore if not base type, subtypes don't need anything
5727 if Typ /= Base_Type (Typ) then
5731 -- Do not override existing representation
5733 if Is_Packed (Typ) then
5736 elsif Has_Specified_Layout (Typ) then
5739 elsif Component_Alignment (Typ) /= Calign_Default then
5743 Set_Component_Alignment
5744 (Typ, Scope_Stack.Table
5745 (Scope_Stack.Last).Component_Alignment_Default);
5747 end Set_Component_Alignment_If_Not_Set;
5753 procedure Undelay_Type (T : Entity_Id) is
5755 Set_Has_Delayed_Freeze (T, False);
5756 Set_Freeze_Node (T, Empty);
5758 -- Since we don't want T to have a Freeze_Node, we don't want its
5759 -- Full_View or Corresponding_Record_Type to have one either.
5761 -- ??? Fundamentally, this whole handling is a kludge. What we really
5762 -- want is to be sure that for an Itype that's part of record R and is a
5763 -- subtype of type T, that it's frozen after the later of the freeze
5764 -- points of R and T. We have no way of doing that directly, so what we
5765 -- do is force most such Itypes to be frozen as part of freezing R via
5766 -- this procedure and only delay the ones that need to be delayed
5767 -- (mostly the designated types of access types that are defined as part
5770 if Is_Private_Type (T)
5771 and then Present (Full_View (T))
5772 and then Is_Itype (Full_View (T))
5773 and then Is_Record_Type (Scope (Full_View (T)))
5775 Undelay_Type (Full_View (T));
5778 if Is_Concurrent_Type (T)
5779 and then Present (Corresponding_Record_Type (T))
5780 and then Is_Itype (Corresponding_Record_Type (T))
5781 and then Is_Record_Type (Scope (Corresponding_Record_Type (T)))
5783 Undelay_Type (Corresponding_Record_Type (T));
5791 procedure Warn_Overlay
5796 Ent : constant Entity_Id := Entity (Nam);
5797 -- The object to which the address clause applies
5800 Old : Entity_Id := Empty;
5804 -- No warning if address clause overlay warnings are off
5806 if not Address_Clause_Overlay_Warnings then
5810 -- No warning if there is an explicit initialization
5812 Init := Original_Node (Expression (Declaration_Node (Ent)));
5814 if Present (Init) and then Comes_From_Source (Init) then
5818 -- We only give the warning for non-imported entities of a type for
5819 -- which a non-null base init proc is defined, or for objects of access
5820 -- types with implicit null initialization, or when Normalize_Scalars
5821 -- applies and the type is scalar or a string type (the latter being
5822 -- tested for because predefined String types are initialized by inline
5823 -- code rather than by an init_proc). Note that we do not give the
5824 -- warning for Initialize_Scalars, since we suppressed initialization
5828 and then not Is_Imported (Ent)
5829 and then (Has_Non_Null_Base_Init_Proc (Typ)
5830 or else Is_Access_Type (Typ)
5831 or else (Normalize_Scalars
5832 and then (Is_Scalar_Type (Typ)
5833 or else Is_String_Type (Typ))))
5835 if Nkind (Expr) = N_Attribute_Reference
5836 and then Is_Entity_Name (Prefix (Expr))
5838 Old := Entity (Prefix (Expr));
5840 elsif Is_Entity_Name (Expr)
5841 and then Ekind (Entity (Expr)) = E_Constant
5843 Decl := Declaration_Node (Entity (Expr));
5845 if Nkind (Decl) = N_Object_Declaration
5846 and then Present (Expression (Decl))
5847 and then Nkind (Expression (Decl)) = N_Attribute_Reference
5848 and then Is_Entity_Name (Prefix (Expression (Decl)))
5850 Old := Entity (Prefix (Expression (Decl)));
5852 elsif Nkind (Expr) = N_Function_Call then
5856 -- A function call (most likely to To_Address) is probably not an
5857 -- overlay, so skip warning. Ditto if the function call was inlined
5858 -- and transformed into an entity.
5860 elsif Nkind (Original_Node (Expr)) = N_Function_Call then
5864 Decl := Next (Parent (Expr));
5866 -- If a pragma Import follows, we assume that it is for the current
5867 -- target of the address clause, and skip the warning.
5870 and then Nkind (Decl) = N_Pragma
5871 and then Pragma_Name (Decl) = Name_Import
5876 if Present (Old) then
5877 Error_Msg_Node_2 := Old;
5879 ("default initialization of & may modify &?",
5883 ("default initialization of & may modify overlaid storage?",
5887 -- Add friendly warning if initialization comes from a packed array
5890 if Is_Record_Type (Typ) then
5895 Comp := First_Component (Typ);
5896 while Present (Comp) loop
5897 if Nkind (Parent (Comp)) = N_Component_Declaration
5898 and then Present (Expression (Parent (Comp)))
5901 elsif Is_Array_Type (Etype (Comp))
5902 and then Present (Packed_Array_Type (Etype (Comp)))
5905 ("\packed array component& " &
5906 "will be initialized to zero?",
5910 Next_Component (Comp);
5917 ("\use pragma Import for & to " &
5918 "suppress initialization (RM B.1(24))?",