1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Debug; use Debug;
28 with Einfo; use Einfo;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Exp_Ch3; use Exp_Ch3;
32 with Exp_Ch7; use Exp_Ch7;
33 with Exp_Disp; use Exp_Disp;
34 with Exp_Pakd; use Exp_Pakd;
35 with Exp_Util; use Exp_Util;
36 with Exp_Tss; use Exp_Tss;
37 with Layout; use Layout;
39 with Namet; use Namet;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Restrict; use Restrict;
44 with Rident; use Rident;
46 with Sem_Aux; use Sem_Aux;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch6; use Sem_Ch6;
49 with Sem_Ch7; use Sem_Ch7;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Ch13; use Sem_Ch13;
52 with Sem_Eval; use Sem_Eval;
53 with Sem_Mech; use Sem_Mech;
54 with Sem_Prag; use Sem_Prag;
55 with Sem_Res; use Sem_Res;
56 with Sem_Util; use Sem_Util;
57 with Sinfo; use Sinfo;
58 with Snames; use Snames;
59 with Stand; use Stand;
60 with Targparm; use Targparm;
61 with Tbuild; use Tbuild;
62 with Ttypes; use Ttypes;
63 with Uintp; use Uintp;
64 with Urealp; use Urealp;
66 package body Freeze is
68 -----------------------
69 -- Local Subprograms --
70 -----------------------
72 procedure Adjust_Esize_For_Alignment (Typ : Entity_Id);
73 -- Typ is a type that is being frozen. If no size clause is given,
74 -- but a default Esize has been computed, then this default Esize is
75 -- adjusted up if necessary to be consistent with a given alignment,
76 -- but never to a value greater than Long_Long_Integer'Size. This
77 -- is used for all discrete types and for fixed-point types.
79 procedure Build_And_Analyze_Renamed_Body
82 After : in out Node_Id);
83 -- Build body for a renaming declaration, insert in tree and analyze
85 procedure Check_Address_Clause (E : Entity_Id);
86 -- Apply legality checks to address clauses for object declarations,
87 -- at the point the object is frozen.
89 procedure Check_Strict_Alignment (E : Entity_Id);
90 -- E is a base type. If E is tagged or has a component that is aliased
91 -- or tagged or contains something this is aliased or tagged, set
94 procedure Check_Unsigned_Type (E : Entity_Id);
95 pragma Inline (Check_Unsigned_Type);
96 -- If E is a fixed-point or discrete type, then all the necessary work
97 -- to freeze it is completed except for possible setting of the flag
98 -- Is_Unsigned_Type, which is done by this procedure. The call has no
99 -- effect if the entity E is not a discrete or fixed-point type.
101 procedure Freeze_And_Append
104 Result : in out List_Id);
105 -- Freezes Ent using Freeze_Entity, and appends the resulting list of
106 -- nodes to Result, modifying Result from No_List if necessary. N has
107 -- the same usage as in Freeze_Entity.
109 procedure Freeze_Enumeration_Type (Typ : Entity_Id);
110 -- Freeze enumeration type. The Esize field is set as processing
111 -- proceeds (i.e. set by default when the type is declared and then
112 -- adjusted by rep clauses. What this procedure does is to make sure
113 -- that if a foreign convention is specified, and no specific size
114 -- is given, then the size must be at least Integer'Size.
116 procedure Freeze_Static_Object (E : Entity_Id);
117 -- If an object is frozen which has Is_Statically_Allocated set, then
118 -- all referenced types must also be marked with this flag. This routine
119 -- is in charge of meeting this requirement for the object entity E.
121 procedure Freeze_Subprogram (E : Entity_Id);
122 -- Perform freezing actions for a subprogram (create extra formals,
123 -- and set proper default mechanism values). Note that this routine
124 -- is not called for internal subprograms, for which neither of these
125 -- actions is needed (or desirable, we do not want for example to have
126 -- these extra formals present in initialization procedures, where they
127 -- would serve no purpose). In this call E is either a subprogram or
128 -- a subprogram type (i.e. an access to a subprogram).
130 function Is_Fully_Defined (T : Entity_Id) return Boolean;
131 -- True if T is not private and has no private components, or has a full
132 -- view. Used to determine whether the designated type of an access type
133 -- should be frozen when the access type is frozen. This is done when an
134 -- allocator is frozen, or an expression that may involve attributes of
135 -- the designated type. Otherwise freezing the access type does not freeze
136 -- the designated type.
138 procedure Process_Default_Expressions
140 After : in out Node_Id);
141 -- This procedure is called for each subprogram to complete processing of
142 -- default expressions at the point where all types are known to be frozen.
143 -- The expressions must be analyzed in full, to make sure that all error
144 -- processing is done (they have only been pre-analyzed). If the expression
145 -- is not an entity or literal, its analysis may generate code which must
146 -- not be executed. In that case we build a function body to hold that
147 -- code. This wrapper function serves no other purpose (it used to be
148 -- called to evaluate the default, but now the default is inlined at each
151 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id);
152 -- Typ is a record or array type that is being frozen. This routine sets
153 -- the default component alignment from the scope stack values if the
154 -- alignment is otherwise not specified.
156 procedure Check_Debug_Info_Needed (T : Entity_Id);
157 -- As each entity is frozen, this routine is called to deal with the
158 -- setting of Debug_Info_Needed for the entity. This flag is set if
159 -- the entity comes from source, or if we are in Debug_Generated_Code
160 -- mode or if the -gnatdV debug flag is set. However, it never sets
161 -- the flag if Debug_Info_Off is set. This procedure also ensures that
162 -- subsidiary entities have the flag set as required.
164 procedure Undelay_Type (T : Entity_Id);
165 -- T is a type of a component that we know to be an Itype. We don't want
166 -- this to have a Freeze_Node, so ensure it doesn't. Do the same for any
167 -- Full_View or Corresponding_Record_Type.
169 procedure Warn_Overlay
173 -- Expr is the expression for an address clause for entity Nam whose type
174 -- is Typ. If Typ has a default initialization, and there is no explicit
175 -- initialization in the source declaration, check whether the address
176 -- clause might cause overlaying of an entity, and emit a warning on the
177 -- side effect that the initialization will cause.
179 -------------------------------
180 -- Adjust_Esize_For_Alignment --
181 -------------------------------
183 procedure Adjust_Esize_For_Alignment (Typ : Entity_Id) is
187 if Known_Esize (Typ) and then Known_Alignment (Typ) then
188 Align := Alignment_In_Bits (Typ);
190 if Align > Esize (Typ)
191 and then Align <= Standard_Long_Long_Integer_Size
193 Set_Esize (Typ, Align);
196 end Adjust_Esize_For_Alignment;
198 ------------------------------------
199 -- Build_And_Analyze_Renamed_Body --
200 ------------------------------------
202 procedure Build_And_Analyze_Renamed_Body
205 After : in out Node_Id)
207 Body_Decl : constant Node_Id := Unit_Declaration_Node (New_S);
208 Ent : constant Entity_Id := Defining_Entity (Decl);
210 Renamed_Subp : Entity_Id;
213 -- If the renamed subprogram is intrinsic, there is no need for a
214 -- wrapper body: we set the alias that will be called and expanded which
215 -- completes the declaration. This transformation is only legal if the
216 -- renamed entity has already been elaborated.
218 -- Note that it is legal for a renaming_as_body to rename an intrinsic
219 -- subprogram, as long as the renaming occurs before the new entity
220 -- is frozen. See RM 8.5.4 (5).
222 if Nkind (Body_Decl) = N_Subprogram_Renaming_Declaration
223 and then Is_Entity_Name (Name (Body_Decl))
225 Renamed_Subp := Entity (Name (Body_Decl));
227 Renamed_Subp := Empty;
230 if Present (Renamed_Subp)
231 and then Is_Intrinsic_Subprogram (Renamed_Subp)
233 (not In_Same_Source_Unit (Renamed_Subp, Ent)
234 or else Sloc (Renamed_Subp) < Sloc (Ent))
236 -- We can make the renaming entity intrinsic if the renamed function
237 -- has an interface name, or if it is one of the shift/rotate
238 -- operations known to the compiler.
240 and then (Present (Interface_Name (Renamed_Subp))
241 or else Chars (Renamed_Subp) = Name_Rotate_Left
242 or else Chars (Renamed_Subp) = Name_Rotate_Right
243 or else Chars (Renamed_Subp) = Name_Shift_Left
244 or else Chars (Renamed_Subp) = Name_Shift_Right
245 or else Chars (Renamed_Subp) = Name_Shift_Right_Arithmetic)
247 Set_Interface_Name (Ent, Interface_Name (Renamed_Subp));
249 if Present (Alias (Renamed_Subp)) then
250 Set_Alias (Ent, Alias (Renamed_Subp));
252 Set_Alias (Ent, Renamed_Subp);
255 Set_Is_Intrinsic_Subprogram (Ent);
256 Set_Has_Completion (Ent);
259 Body_Node := Build_Renamed_Body (Decl, New_S);
260 Insert_After (After, Body_Node);
261 Mark_Rewrite_Insertion (Body_Node);
265 end Build_And_Analyze_Renamed_Body;
267 ------------------------
268 -- Build_Renamed_Body --
269 ------------------------
271 function Build_Renamed_Body
273 New_S : Entity_Id) return Node_Id
275 Loc : constant Source_Ptr := Sloc (New_S);
276 -- We use for the source location of the renamed body, the location of
277 -- the spec entity. It might seem more natural to use the location of
278 -- the renaming declaration itself, but that would be wrong, since then
279 -- the body we create would look as though it was created far too late,
280 -- and this could cause problems with elaboration order analysis,
281 -- particularly in connection with instantiations.
283 N : constant Node_Id := Unit_Declaration_Node (New_S);
284 Nam : constant Node_Id := Name (N);
286 Spec : constant Node_Id := New_Copy_Tree (Specification (Decl));
287 Actuals : List_Id := No_List;
292 O_Formal : Entity_Id;
293 Param_Spec : Node_Id;
295 Pref : Node_Id := Empty;
296 -- If the renamed entity is a primitive operation given in prefix form,
297 -- the prefix is the target object and it has to be added as the first
298 -- actual in the generated call.
301 -- Determine the entity being renamed, which is the target of the call
302 -- statement. If the name is an explicit dereference, this is a renaming
303 -- of a subprogram type rather than a subprogram. The name itself is
306 if Nkind (Nam) = N_Selected_Component then
307 Old_S := Entity (Selector_Name (Nam));
309 elsif Nkind (Nam) = N_Explicit_Dereference then
310 Old_S := Etype (Nam);
312 elsif Nkind (Nam) = N_Indexed_Component then
313 if Is_Entity_Name (Prefix (Nam)) then
314 Old_S := Entity (Prefix (Nam));
316 Old_S := Entity (Selector_Name (Prefix (Nam)));
319 elsif Nkind (Nam) = N_Character_Literal then
320 Old_S := Etype (New_S);
323 Old_S := Entity (Nam);
326 if Is_Entity_Name (Nam) then
328 -- If the renamed entity is a predefined operator, retain full name
329 -- to ensure its visibility.
331 if Ekind (Old_S) = E_Operator
332 and then Nkind (Nam) = N_Expanded_Name
334 Call_Name := New_Copy (Name (N));
336 Call_Name := New_Reference_To (Old_S, Loc);
340 if Nkind (Nam) = N_Selected_Component
341 and then Present (First_Formal (Old_S))
343 (Is_Controlling_Formal (First_Formal (Old_S))
344 or else Is_Class_Wide_Type (Etype (First_Formal (Old_S))))
347 -- Retrieve the target object, to be added as a first actual
350 Call_Name := New_Occurrence_Of (Old_S, Loc);
351 Pref := Prefix (Nam);
354 Call_Name := New_Copy (Name (N));
357 -- Original name may have been overloaded, but is fully resolved now
359 Set_Is_Overloaded (Call_Name, False);
362 -- For simple renamings, subsequent calls can be expanded directly as
363 -- calls to the renamed entity. The body must be generated in any case
364 -- for calls that may appear elsewhere.
366 if Ekind_In (Old_S, E_Function, E_Procedure)
367 and then Nkind (Decl) = N_Subprogram_Declaration
369 Set_Body_To_Inline (Decl, Old_S);
372 -- The body generated for this renaming is an internal artifact, and
373 -- does not constitute a freeze point for the called entity.
375 Set_Must_Not_Freeze (Call_Name);
377 Formal := First_Formal (Defining_Entity (Decl));
379 if Present (Pref) then
381 Pref_Type : constant Entity_Id := Etype (Pref);
382 Form_Type : constant Entity_Id := Etype (First_Formal (Old_S));
385 -- The controlling formal may be an access parameter, or the
386 -- actual may be an access value, so adjust accordingly.
388 if Is_Access_Type (Pref_Type)
389 and then not Is_Access_Type (Form_Type)
392 (Make_Explicit_Dereference (Loc, Relocate_Node (Pref)));
394 elsif Is_Access_Type (Form_Type)
395 and then not Is_Access_Type (Pref)
398 (Make_Attribute_Reference (Loc,
399 Attribute_Name => Name_Access,
400 Prefix => Relocate_Node (Pref)));
402 Actuals := New_List (Pref);
406 elsif Present (Formal) then
413 if Present (Formal) then
414 while Present (Formal) loop
415 Append (New_Reference_To (Formal, Loc), Actuals);
416 Next_Formal (Formal);
420 -- If the renamed entity is an entry, inherit its profile. For other
421 -- renamings as bodies, both profiles must be subtype conformant, so it
422 -- is not necessary to replace the profile given in the declaration.
423 -- However, default values that are aggregates are rewritten when
424 -- partially analyzed, so we recover the original aggregate to insure
425 -- that subsequent conformity checking works. Similarly, if the default
426 -- expression was constant-folded, recover the original expression.
428 Formal := First_Formal (Defining_Entity (Decl));
430 if Present (Formal) then
431 O_Formal := First_Formal (Old_S);
432 Param_Spec := First (Parameter_Specifications (Spec));
433 while Present (Formal) loop
434 if Is_Entry (Old_S) then
435 if Nkind (Parameter_Type (Param_Spec)) /=
438 Set_Etype (Formal, Etype (O_Formal));
439 Set_Entity (Parameter_Type (Param_Spec), Etype (O_Formal));
442 elsif Nkind (Default_Value (O_Formal)) = N_Aggregate
443 or else Nkind (Original_Node (Default_Value (O_Formal))) /=
444 Nkind (Default_Value (O_Formal))
446 Set_Expression (Param_Spec,
447 New_Copy_Tree (Original_Node (Default_Value (O_Formal))));
450 Next_Formal (Formal);
451 Next_Formal (O_Formal);
456 -- If the renamed entity is a function, the generated body contains a
457 -- return statement. Otherwise, build a procedure call. If the entity is
458 -- an entry, subsequent analysis of the call will transform it into the
459 -- proper entry or protected operation call. If the renamed entity is
460 -- a character literal, return it directly.
462 if Ekind (Old_S) = E_Function
463 or else Ekind (Old_S) = E_Operator
464 or else (Ekind (Old_S) = E_Subprogram_Type
465 and then Etype (Old_S) /= Standard_Void_Type)
468 Make_Simple_Return_Statement (Loc,
470 Make_Function_Call (Loc,
472 Parameter_Associations => Actuals));
474 elsif Ekind (Old_S) = E_Enumeration_Literal then
476 Make_Simple_Return_Statement (Loc,
477 Expression => New_Occurrence_Of (Old_S, Loc));
479 elsif Nkind (Nam) = N_Character_Literal then
481 Make_Simple_Return_Statement (Loc,
482 Expression => Call_Name);
486 Make_Procedure_Call_Statement (Loc,
488 Parameter_Associations => Actuals);
491 -- Create entities for subprogram body and formals
493 Set_Defining_Unit_Name (Spec,
494 Make_Defining_Identifier (Loc, Chars => Chars (New_S)));
496 Param_Spec := First (Parameter_Specifications (Spec));
497 while Present (Param_Spec) loop
498 Set_Defining_Identifier (Param_Spec,
499 Make_Defining_Identifier (Loc,
500 Chars => Chars (Defining_Identifier (Param_Spec))));
505 Make_Subprogram_Body (Loc,
506 Specification => Spec,
507 Declarations => New_List,
508 Handled_Statement_Sequence =>
509 Make_Handled_Sequence_Of_Statements (Loc,
510 Statements => New_List (Call_Node)));
512 if Nkind (Decl) /= N_Subprogram_Declaration then
514 Make_Subprogram_Declaration (Loc,
515 Specification => Specification (N)));
518 -- Link the body to the entity whose declaration it completes. If
519 -- the body is analyzed when the renamed entity is frozen, it may
520 -- be necessary to restore the proper scope (see package Exp_Ch13).
522 if Nkind (N) = N_Subprogram_Renaming_Declaration
523 and then Present (Corresponding_Spec (N))
525 Set_Corresponding_Spec (Body_Node, Corresponding_Spec (N));
527 Set_Corresponding_Spec (Body_Node, New_S);
531 end Build_Renamed_Body;
533 --------------------------
534 -- Check_Address_Clause --
535 --------------------------
537 procedure Check_Address_Clause (E : Entity_Id) is
538 Addr : constant Node_Id := Address_Clause (E);
540 Decl : constant Node_Id := Declaration_Node (E);
541 Typ : constant Entity_Id := Etype (E);
544 if Present (Addr) then
545 Expr := Expression (Addr);
547 if Needs_Constant_Address (Decl, Typ) then
548 Check_Constant_Address_Clause (Expr, E);
550 -- Has_Delayed_Freeze was set on E when the address clause was
551 -- analyzed. Reset the flag now unless freeze actions were
552 -- attached to it in the mean time.
554 if No (Freeze_Node (E)) then
555 Set_Has_Delayed_Freeze (E, False);
559 -- If Rep_Clauses are to be ignored, remove address clause from
560 -- list attached to entity, because it may be illegal for gigi,
561 -- for example by breaking order of elaboration..
563 if Ignore_Rep_Clauses then
568 Rep := First_Rep_Item (E);
571 Set_First_Rep_Item (E, Next_Rep_Item (Addr));
575 and then Next_Rep_Item (Rep) /= Addr
577 Rep := Next_Rep_Item (Rep);
581 if Present (Rep) then
582 Set_Next_Rep_Item (Rep, Next_Rep_Item (Addr));
586 Rewrite (Addr, Make_Null_Statement (Sloc (E)));
588 elsif not Error_Posted (Expr)
589 and then not Needs_Finalization (Typ)
591 Warn_Overlay (Expr, Typ, Name (Addr));
594 end Check_Address_Clause;
596 -----------------------------
597 -- Check_Compile_Time_Size --
598 -----------------------------
600 procedure Check_Compile_Time_Size (T : Entity_Id) is
602 procedure Set_Small_Size (T : Entity_Id; S : Uint);
603 -- Sets the compile time known size (32 bits or less) in the Esize
604 -- field, of T checking for a size clause that was given which attempts
605 -- to give a smaller size, and also checking for an alignment clause.
607 function Size_Known (T : Entity_Id) return Boolean;
608 -- Recursive function that does all the work
610 function Static_Discriminated_Components (T : Entity_Id) return Boolean;
611 -- If T is a constrained subtype, its size is not known if any of its
612 -- discriminant constraints is not static and it is not a null record.
613 -- The test is conservative and doesn't check that the components are
614 -- in fact constrained by non-static discriminant values. Could be made
621 procedure Set_Small_Size (T : Entity_Id; S : Uint) is
626 -- Don't bother if alignment clause with a value other than 1 is
627 -- present, because size may be padded up to meet back end alignment
628 -- requirements, and only the back end knows the rules!
630 elsif Known_Alignment (T) and then Alignment (T) /= 1 then
633 -- Check for bad size clause given
635 elsif Has_Size_Clause (T) then
636 if RM_Size (T) < S then
637 Error_Msg_Uint_1 := S;
639 ("size for& too small, minimum allowed is ^",
642 elsif Unknown_Esize (T) then
646 -- Set sizes if not set already
649 if Unknown_Esize (T) then
653 if Unknown_RM_Size (T) then
663 function Size_Known (T : Entity_Id) return Boolean is
671 if Size_Known_At_Compile_Time (T) then
674 -- Always True for scalar types. This is true even for generic formal
675 -- scalar types. We used to return False in the latter case, but the
676 -- size is known at compile time, even in the template, we just do
677 -- not know the exact size but that's not the point of this routine.
679 elsif Is_Scalar_Type (T)
680 or else Is_Task_Type (T)
686 elsif Is_Array_Type (T) then
688 -- String literals always have known size, and we can set it
690 if Ekind (T) = E_String_Literal_Subtype then
691 Set_Small_Size (T, Component_Size (T)
692 * String_Literal_Length (T));
695 -- Unconstrained types never have known at compile time size
697 elsif not Is_Constrained (T) then
700 -- Don't do any recursion on type with error posted, since we may
701 -- have a malformed type that leads us into a loop.
703 elsif Error_Posted (T) then
706 -- Otherwise if component size unknown, then array size unknown
708 elsif not Size_Known (Component_Type (T)) then
712 -- Check for all indexes static, and also compute possible size
713 -- (in case it is less than 32 and may be packable).
716 Esiz : Uint := Component_Size (T);
720 Index := First_Index (T);
721 while Present (Index) loop
722 if Nkind (Index) = N_Range then
723 Get_Index_Bounds (Index, Low, High);
725 elsif Error_Posted (Scalar_Range (Etype (Index))) then
729 Low := Type_Low_Bound (Etype (Index));
730 High := Type_High_Bound (Etype (Index));
733 if not Compile_Time_Known_Value (Low)
734 or else not Compile_Time_Known_Value (High)
735 or else Etype (Index) = Any_Type
740 Dim := Expr_Value (High) - Expr_Value (Low) + 1;
752 Set_Small_Size (T, Esiz);
756 -- Access types always have known at compile time sizes
758 elsif Is_Access_Type (T) then
761 -- For non-generic private types, go to underlying type if present
763 elsif Is_Private_Type (T)
764 and then not Is_Generic_Type (T)
765 and then Present (Underlying_Type (T))
767 -- Don't do any recursion on type with error posted, since we may
768 -- have a malformed type that leads us into a loop.
770 if Error_Posted (T) then
773 return Size_Known (Underlying_Type (T));
778 elsif Is_Record_Type (T) then
780 -- A class-wide type is never considered to have a known size
782 if Is_Class_Wide_Type (T) then
785 -- A subtype of a variant record must not have non-static
786 -- discriminated components.
788 elsif T /= Base_Type (T)
789 and then not Static_Discriminated_Components (T)
793 -- Don't do any recursion on type with error posted, since we may
794 -- have a malformed type that leads us into a loop.
796 elsif Error_Posted (T) then
800 -- Now look at the components of the record
803 -- The following two variables are used to keep track of the
804 -- size of packed records if we can tell the size of the packed
805 -- record in the front end. Packed_Size_Known is True if so far
806 -- we can figure out the size. It is initialized to True for a
807 -- packed record, unless the record has discriminants. The
808 -- reason we eliminate the discriminated case is that we don't
809 -- know the way the back end lays out discriminated packed
810 -- records. If Packed_Size_Known is True, then Packed_Size is
811 -- the size in bits so far.
813 Packed_Size_Known : Boolean :=
815 and then not Has_Discriminants (T);
817 Packed_Size : Uint := Uint_0;
820 -- Test for variant part present
822 if Has_Discriminants (T)
823 and then Present (Parent (T))
824 and then Nkind (Parent (T)) = N_Full_Type_Declaration
825 and then Nkind (Type_Definition (Parent (T))) =
827 and then not Null_Present (Type_Definition (Parent (T)))
828 and then Present (Variant_Part
829 (Component_List (Type_Definition (Parent (T)))))
831 -- If variant part is present, and type is unconstrained,
832 -- then we must have defaulted discriminants, or a size
833 -- clause must be present for the type, or else the size
834 -- is definitely not known at compile time.
836 if not Is_Constrained (T)
838 No (Discriminant_Default_Value (First_Discriminant (T)))
839 and then Unknown_Esize (T)
845 -- Loop through components
847 Comp := First_Component_Or_Discriminant (T);
848 while Present (Comp) loop
849 Ctyp := Etype (Comp);
851 -- We do not know the packed size if there is a component
852 -- clause present (we possibly could, but this would only
853 -- help in the case of a record with partial rep clauses.
854 -- That's because in the case of full rep clauses, the
855 -- size gets figured out anyway by a different circuit).
857 if Present (Component_Clause (Comp)) then
858 Packed_Size_Known := False;
861 -- We need to identify a component that is an array where
862 -- the index type is an enumeration type with non-standard
863 -- representation, and some bound of the type depends on a
866 -- This is because gigi computes the size by doing a
867 -- substitution of the appropriate discriminant value in
868 -- the size expression for the base type, and gigi is not
869 -- clever enough to evaluate the resulting expression (which
870 -- involves a call to rep_to_pos) at compile time.
872 -- It would be nice if gigi would either recognize that
873 -- this expression can be computed at compile time, or
874 -- alternatively figured out the size from the subtype
875 -- directly, where all the information is at hand ???
877 if Is_Array_Type (Etype (Comp))
878 and then Present (Packed_Array_Type (Etype (Comp)))
881 Ocomp : constant Entity_Id :=
882 Original_Record_Component (Comp);
883 OCtyp : constant Entity_Id := Etype (Ocomp);
889 Ind := First_Index (OCtyp);
890 while Present (Ind) loop
891 Indtyp := Etype (Ind);
893 if Is_Enumeration_Type (Indtyp)
894 and then Has_Non_Standard_Rep (Indtyp)
896 Lo := Type_Low_Bound (Indtyp);
897 Hi := Type_High_Bound (Indtyp);
899 if Is_Entity_Name (Lo)
900 and then Ekind (Entity (Lo)) = E_Discriminant
904 elsif Is_Entity_Name (Hi)
905 and then Ekind (Entity (Hi)) = E_Discriminant
916 -- Clearly size of record is not known if the size of one of
917 -- the components is not known.
919 if not Size_Known (Ctyp) then
923 -- Accumulate packed size if possible
925 if Packed_Size_Known then
927 -- We can only deal with elementary types, since for
928 -- non-elementary components, alignment enters into the
929 -- picture, and we don't know enough to handle proper
930 -- alignment in this context. Packed arrays count as
931 -- elementary if the representation is a modular type.
933 if Is_Elementary_Type (Ctyp)
934 or else (Is_Array_Type (Ctyp)
935 and then Present (Packed_Array_Type (Ctyp))
936 and then Is_Modular_Integer_Type
937 (Packed_Array_Type (Ctyp)))
939 -- If RM_Size is known and static, then we can keep
940 -- accumulating the packed size.
942 if Known_Static_RM_Size (Ctyp) then
944 -- A little glitch, to be removed sometime ???
945 -- gigi does not understand zero sizes yet.
947 if RM_Size (Ctyp) = Uint_0 then
948 Packed_Size_Known := False;
950 -- Normal case where we can keep accumulating the
951 -- packed array size.
954 Packed_Size := Packed_Size + RM_Size (Ctyp);
957 -- If we have a field whose RM_Size is not known then
958 -- we can't figure out the packed size here.
961 Packed_Size_Known := False;
964 -- If we have a non-elementary type we can't figure out
965 -- the packed array size (alignment issues).
968 Packed_Size_Known := False;
972 Next_Component_Or_Discriminant (Comp);
975 if Packed_Size_Known then
976 Set_Small_Size (T, Packed_Size);
982 -- All other cases, size not known at compile time
989 -------------------------------------
990 -- Static_Discriminated_Components --
991 -------------------------------------
993 function Static_Discriminated_Components
994 (T : Entity_Id) return Boolean
996 Constraint : Elmt_Id;
999 if Has_Discriminants (T)
1000 and then Present (Discriminant_Constraint (T))
1001 and then Present (First_Component (T))
1003 Constraint := First_Elmt (Discriminant_Constraint (T));
1004 while Present (Constraint) loop
1005 if not Compile_Time_Known_Value (Node (Constraint)) then
1009 Next_Elmt (Constraint);
1014 end Static_Discriminated_Components;
1016 -- Start of processing for Check_Compile_Time_Size
1019 Set_Size_Known_At_Compile_Time (T, Size_Known (T));
1020 end Check_Compile_Time_Size;
1022 -----------------------------
1023 -- Check_Debug_Info_Needed --
1024 -----------------------------
1026 procedure Check_Debug_Info_Needed (T : Entity_Id) is
1028 if Debug_Info_Off (T) then
1031 elsif Comes_From_Source (T)
1032 or else Debug_Generated_Code
1033 or else Debug_Flag_VV
1034 or else Needs_Debug_Info (T)
1036 Set_Debug_Info_Needed (T);
1038 end Check_Debug_Info_Needed;
1040 ----------------------------
1041 -- Check_Strict_Alignment --
1042 ----------------------------
1044 procedure Check_Strict_Alignment (E : Entity_Id) is
1048 if Is_Tagged_Type (E) or else Is_Concurrent_Type (E) then
1049 Set_Strict_Alignment (E);
1051 elsif Is_Array_Type (E) then
1052 Set_Strict_Alignment (E, Strict_Alignment (Component_Type (E)));
1054 elsif Is_Record_Type (E) then
1055 if Is_Limited_Record (E) then
1056 Set_Strict_Alignment (E);
1060 Comp := First_Component (E);
1061 while Present (Comp) loop
1062 if not Is_Type (Comp)
1063 and then (Strict_Alignment (Etype (Comp))
1064 or else Is_Aliased (Comp))
1066 Set_Strict_Alignment (E);
1070 Next_Component (Comp);
1073 end Check_Strict_Alignment;
1075 -------------------------
1076 -- Check_Unsigned_Type --
1077 -------------------------
1079 procedure Check_Unsigned_Type (E : Entity_Id) is
1080 Ancestor : Entity_Id;
1085 if not Is_Discrete_Or_Fixed_Point_Type (E) then
1089 -- Do not attempt to analyze case where range was in error
1091 if No (Scalar_Range (E))
1092 or else Error_Posted (Scalar_Range (E))
1097 -- The situation that is non trivial is something like
1099 -- subtype x1 is integer range -10 .. +10;
1100 -- subtype x2 is x1 range 0 .. V1;
1101 -- subtype x3 is x2 range V2 .. V3;
1102 -- subtype x4 is x3 range V4 .. V5;
1104 -- where Vn are variables. Here the base type is signed, but we still
1105 -- know that x4 is unsigned because of the lower bound of x2.
1107 -- The only way to deal with this is to look up the ancestor chain
1111 if Ancestor = Any_Type or else Etype (Ancestor) = Any_Type then
1115 Lo_Bound := Type_Low_Bound (Ancestor);
1117 if Compile_Time_Known_Value (Lo_Bound) then
1119 if Expr_Rep_Value (Lo_Bound) >= 0 then
1120 Set_Is_Unsigned_Type (E, True);
1126 Ancestor := Ancestor_Subtype (Ancestor);
1128 -- If no ancestor had a static lower bound, go to base type
1130 if No (Ancestor) then
1132 -- Note: the reason we still check for a compile time known
1133 -- value for the base type is that at least in the case of
1134 -- generic formals, we can have bounds that fail this test,
1135 -- and there may be other cases in error situations.
1137 Btyp := Base_Type (E);
1139 if Btyp = Any_Type or else Etype (Btyp) = Any_Type then
1143 Lo_Bound := Type_Low_Bound (Base_Type (E));
1145 if Compile_Time_Known_Value (Lo_Bound)
1146 and then Expr_Rep_Value (Lo_Bound) >= 0
1148 Set_Is_Unsigned_Type (E, True);
1155 end Check_Unsigned_Type;
1157 -------------------------
1158 -- Is_Atomic_Aggregate --
1159 -------------------------
1161 function Is_Atomic_Aggregate
1163 Typ : Entity_Id) return Boolean
1165 Loc : constant Source_Ptr := Sloc (E);
1173 -- Array may be qualified, so find outer context
1175 if Nkind (Par) = N_Qualified_Expression then
1176 Par := Parent (Par);
1179 if Nkind_In (Par, N_Object_Declaration, N_Assignment_Statement)
1180 and then Comes_From_Source (Par)
1182 Temp := Make_Temporary (Loc, 'T', E);
1184 Make_Object_Declaration (Loc,
1185 Defining_Identifier => Temp,
1186 Object_Definition => New_Occurrence_Of (Typ, Loc),
1187 Expression => Relocate_Node (E));
1188 Insert_Before (Par, New_N);
1191 Set_Expression (Par, New_Occurrence_Of (Temp, Loc));
1196 end Is_Atomic_Aggregate;
1202 -- Note: the easy coding for this procedure would be to just build a
1203 -- single list of freeze nodes and then insert them and analyze them
1204 -- all at once. This won't work, because the analysis of earlier freeze
1205 -- nodes may recursively freeze types which would otherwise appear later
1206 -- on in the freeze list. So we must analyze and expand the freeze nodes
1207 -- as they are generated.
1209 procedure Freeze_All (From : Entity_Id; After : in out Node_Id) is
1213 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id);
1214 -- This is the internal recursive routine that does freezing of entities
1215 -- (but NOT the analysis of default expressions, which should not be
1216 -- recursive, we don't want to analyze those till we are sure that ALL
1217 -- the types are frozen).
1219 --------------------
1220 -- Freeze_All_Ent --
1221 --------------------
1223 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id) is
1228 procedure Process_Flist;
1229 -- If freeze nodes are present, insert and analyze, and reset cursor
1230 -- for next insertion.
1236 procedure Process_Flist is
1238 if Is_Non_Empty_List (Flist) then
1239 Lastn := Next (After);
1240 Insert_List_After_And_Analyze (After, Flist);
1242 if Present (Lastn) then
1243 After := Prev (Lastn);
1245 After := Last (List_Containing (After));
1250 -- Start or processing for Freeze_All_Ent
1254 while Present (E) loop
1256 -- If the entity is an inner package which is not a package
1257 -- renaming, then its entities must be frozen at this point. Note
1258 -- that such entities do NOT get frozen at the end of the nested
1259 -- package itself (only library packages freeze).
1261 -- Same is true for task declarations, where anonymous records
1262 -- created for entry parameters must be frozen.
1264 if Ekind (E) = E_Package
1265 and then No (Renamed_Object (E))
1266 and then not Is_Child_Unit (E)
1267 and then not Is_Frozen (E)
1270 Install_Visible_Declarations (E);
1271 Install_Private_Declarations (E);
1273 Freeze_All (First_Entity (E), After);
1275 End_Package_Scope (E);
1277 elsif Ekind (E) in Task_Kind
1279 (Nkind (Parent (E)) = N_Task_Type_Declaration
1281 Nkind (Parent (E)) = N_Single_Task_Declaration)
1284 Freeze_All (First_Entity (E), After);
1287 -- For a derived tagged type, we must ensure that all the
1288 -- primitive operations of the parent have been frozen, so that
1289 -- their addresses will be in the parent's dispatch table at the
1290 -- point it is inherited.
1292 elsif Ekind (E) = E_Record_Type
1293 and then Is_Tagged_Type (E)
1294 and then Is_Tagged_Type (Etype (E))
1295 and then Is_Derived_Type (E)
1298 Prim_List : constant Elist_Id :=
1299 Primitive_Operations (Etype (E));
1305 Prim := First_Elmt (Prim_List);
1306 while Present (Prim) loop
1307 Subp := Node (Prim);
1309 if Comes_From_Source (Subp)
1310 and then not Is_Frozen (Subp)
1312 Flist := Freeze_Entity (Subp, After);
1321 if not Is_Frozen (E) then
1322 Flist := Freeze_Entity (E, After);
1325 -- If already frozen, and there are delayed aspects, this is where
1326 -- we do the visibility check for these aspects (see Sem_Ch13 spec
1327 -- for a description of how we handle aspect visibility).
1329 elsif Has_Delayed_Aspects (E) then
1334 Ritem := First_Rep_Item (E);
1335 while Present (Ritem) loop
1336 if Nkind (Ritem) = N_Aspect_Specification
1337 and then Entity (Ritem) = E
1338 and then Is_Delayed_Aspect (Ritem)
1340 Check_Aspect_At_End_Of_Declarations (Ritem);
1343 Ritem := Next_Rep_Item (Ritem);
1348 -- If an incomplete type is still not frozen, this may be a
1349 -- premature freezing because of a body declaration that follows.
1350 -- Indicate where the freezing took place.
1352 -- If the freezing is caused by the end of the current declarative
1353 -- part, it is a Taft Amendment type, and there is no error.
1355 if not Is_Frozen (E)
1356 and then Ekind (E) = E_Incomplete_Type
1359 Bod : constant Node_Id := Next (After);
1362 if (Nkind_In (Bod, N_Subprogram_Body,
1367 or else Nkind (Bod) in N_Body_Stub)
1369 List_Containing (After) = List_Containing (Parent (E))
1371 Error_Msg_Sloc := Sloc (Next (After));
1373 ("type& is frozen# before its full declaration",
1383 -- Start of processing for Freeze_All
1386 Freeze_All_Ent (From, After);
1388 -- Now that all types are frozen, we can deal with default expressions
1389 -- that require us to build a default expression functions. This is the
1390 -- point at which such functions are constructed (after all types that
1391 -- might be used in such expressions have been frozen).
1393 -- For subprograms that are renaming_as_body, we create the wrapper
1394 -- bodies as needed.
1396 -- We also add finalization chains to access types whose designated
1397 -- types are controlled. This is normally done when freezing the type,
1398 -- but this misses recursive type definitions where the later members
1399 -- of the recursion introduce controlled components.
1401 -- Loop through entities
1404 while Present (E) loop
1405 if Is_Subprogram (E) then
1407 if not Default_Expressions_Processed (E) then
1408 Process_Default_Expressions (E, After);
1411 if not Has_Completion (E) then
1412 Decl := Unit_Declaration_Node (E);
1414 if Nkind (Decl) = N_Subprogram_Renaming_Declaration then
1415 Build_And_Analyze_Renamed_Body (Decl, E, After);
1417 elsif Nkind (Decl) = N_Subprogram_Declaration
1418 and then Present (Corresponding_Body (Decl))
1420 Nkind (Unit_Declaration_Node (Corresponding_Body (Decl)))
1421 = N_Subprogram_Renaming_Declaration
1423 Build_And_Analyze_Renamed_Body
1424 (Decl, Corresponding_Body (Decl), After);
1428 elsif Ekind (E) in Task_Kind
1430 (Nkind (Parent (E)) = N_Task_Type_Declaration
1432 Nkind (Parent (E)) = N_Single_Task_Declaration)
1438 Ent := First_Entity (E);
1439 while Present (Ent) loop
1441 and then not Default_Expressions_Processed (Ent)
1443 Process_Default_Expressions (Ent, After);
1450 -- We add finalization collections to access types whose designated
1451 -- types require finalization. This is normally done when freezing
1452 -- the type, but this misses recursive type definitions where the
1453 -- later members of the recursion introduce controlled components
1454 -- (such as can happen when incomplete types are involved), as well
1455 -- cases where a component type is private and the controlled full
1456 -- type occurs after the access type is frozen. Cases that don't
1457 -- need a finalization collection are generic formal types (the
1458 -- actual type will have it) and types with Java and CIL conventions,
1459 -- since those are used for API bindings. (Are there any other cases
1460 -- that should be excluded here???)
1462 elsif Is_Access_Type (E)
1463 and then Comes_From_Source (E)
1464 and then not Is_Generic_Type (E)
1465 and then Needs_Finalization (Designated_Type (E))
1466 and then No (Associated_Collection (E))
1467 and then Convention (Designated_Type (E)) /= Convention_Java
1468 and then Convention (Designated_Type (E)) /= Convention_CIL
1470 Build_Finalization_Collection (E);
1477 -----------------------
1478 -- Freeze_And_Append --
1479 -----------------------
1481 procedure Freeze_And_Append
1484 Result : in out List_Id)
1486 L : constant List_Id := Freeze_Entity (Ent, N);
1488 if Is_Non_Empty_List (L) then
1489 if Result = No_List then
1492 Append_List (L, Result);
1495 end Freeze_And_Append;
1501 procedure Freeze_Before (N : Node_Id; T : Entity_Id) is
1502 Freeze_Nodes : constant List_Id := Freeze_Entity (T, N);
1504 if Is_Non_Empty_List (Freeze_Nodes) then
1505 Insert_Actions (N, Freeze_Nodes);
1513 function Freeze_Entity (E : Entity_Id; N : Node_Id) return List_Id is
1514 Loc : constant Source_Ptr := Sloc (N);
1515 Test_E : Entity_Id := E;
1522 Result : List_Id := No_List;
1523 -- List of freezing actions, left at No_List if none
1525 Has_Default_Initialization : Boolean := False;
1526 -- This flag gets set to true for a variable with default initialization
1528 procedure Add_To_Result (N : Node_Id);
1529 -- N is a freezing action to be appended to the Result
1531 procedure Check_Current_Instance (Comp_Decl : Node_Id);
1532 -- Check that an Access or Unchecked_Access attribute with a prefix
1533 -- which is the current instance type can only be applied when the type
1536 procedure Check_Suspicious_Modulus (Utype : Entity_Id);
1537 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1538 -- integer literal without an explicit corresponding size clause. The
1539 -- caller has checked that Utype is a modular integer type.
1541 function After_Last_Declaration return Boolean;
1542 -- If Loc is a freeze_entity that appears after the last declaration
1543 -- in the scope, inhibit error messages on late completion.
1545 procedure Freeze_Record_Type (Rec : Entity_Id);
1546 -- Freeze each component, handle some representation clauses, and freeze
1547 -- primitive operations if this is a tagged type.
1553 procedure Add_To_Result (N : Node_Id) is
1556 Result := New_List (N);
1562 ----------------------------
1563 -- After_Last_Declaration --
1564 ----------------------------
1566 function After_Last_Declaration return Boolean is
1567 Spec : constant Node_Id := Parent (Current_Scope);
1569 if Nkind (Spec) = N_Package_Specification then
1570 if Present (Private_Declarations (Spec)) then
1571 return Loc >= Sloc (Last (Private_Declarations (Spec)));
1572 elsif Present (Visible_Declarations (Spec)) then
1573 return Loc >= Sloc (Last (Visible_Declarations (Spec)));
1580 end After_Last_Declaration;
1582 ----------------------------
1583 -- Check_Current_Instance --
1584 ----------------------------
1586 procedure Check_Current_Instance (Comp_Decl : Node_Id) is
1588 Rec_Type : constant Entity_Id :=
1589 Scope (Defining_Identifier (Comp_Decl));
1591 Decl : constant Node_Id := Parent (Rec_Type);
1593 function Process (N : Node_Id) return Traverse_Result;
1594 -- Process routine to apply check to given node
1600 function Process (N : Node_Id) return Traverse_Result is
1603 when N_Attribute_Reference =>
1604 if (Attribute_Name (N) = Name_Access
1606 Attribute_Name (N) = Name_Unchecked_Access)
1607 and then Is_Entity_Name (Prefix (N))
1608 and then Is_Type (Entity (Prefix (N)))
1609 and then Entity (Prefix (N)) = E
1612 ("current instance must be a limited type", Prefix (N));
1618 when others => return OK;
1622 procedure Traverse is new Traverse_Proc (Process);
1624 -- Start of processing for Check_Current_Instance
1627 -- In Ada95, the (imprecise) rule is that the current instance of a
1628 -- limited type is aliased. In Ada2005, limitedness must be explicit:
1629 -- either a tagged type, or a limited record.
1631 if Is_Limited_Type (Rec_Type)
1632 and then (Ada_Version < Ada_2005 or else Is_Tagged_Type (Rec_Type))
1636 elsif Nkind (Decl) = N_Full_Type_Declaration
1637 and then Limited_Present (Type_Definition (Decl))
1642 Traverse (Comp_Decl);
1644 end Check_Current_Instance;
1646 ------------------------------
1647 -- Check_Suspicious_Modulus --
1648 ------------------------------
1650 procedure Check_Suspicious_Modulus (Utype : Entity_Id) is
1651 Decl : constant Node_Id := Declaration_Node (Underlying_Type (Utype));
1654 if Nkind (Decl) = N_Full_Type_Declaration then
1656 Tdef : constant Node_Id := Type_Definition (Decl);
1658 if Nkind (Tdef) = N_Modular_Type_Definition then
1660 Modulus : constant Node_Id :=
1661 Original_Node (Expression (Tdef));
1663 if Nkind (Modulus) = N_Integer_Literal then
1665 Modv : constant Uint := Intval (Modulus);
1666 Sizv : constant Uint := RM_Size (Utype);
1669 -- First case, modulus and size are the same. This
1670 -- happens if you have something like mod 32, with
1671 -- an explicit size of 32, this is for sure a case
1672 -- where the warning is given, since it is seems
1673 -- very unlikely that someone would want e.g. a
1674 -- five bit type stored in 32 bits. It is much
1675 -- more likely they wanted a 32-bit type.
1680 -- Second case, the modulus is 32 or 64 and no
1681 -- size clause is present. This is a less clear
1682 -- case for giving the warning, but in the case
1683 -- of 32/64 (5-bit or 6-bit types) these seem rare
1684 -- enough that it is a likely error (and in any
1685 -- case using 2**5 or 2**6 in these cases seems
1686 -- clearer. We don't include 8 or 16 here, simply
1687 -- because in practice 3-bit and 4-bit types are
1688 -- more common and too many false positives if
1689 -- we warn in these cases.
1691 elsif not Has_Size_Clause (Utype)
1692 and then (Modv = Uint_32 or else Modv = Uint_64)
1696 -- No warning needed
1702 -- If we fall through, give warning
1704 Error_Msg_Uint_1 := Modv;
1706 ("?2 '*'*^' may have been intended here",
1714 end Check_Suspicious_Modulus;
1716 ------------------------
1717 -- Freeze_Record_Type --
1718 ------------------------
1720 procedure Freeze_Record_Type (Rec : Entity_Id) is
1727 pragma Warnings (Off, Junk);
1729 Unplaced_Component : Boolean := False;
1730 -- Set True if we find at least one component with no component
1731 -- clause (used to warn about useless Pack pragmas).
1733 Placed_Component : Boolean := False;
1734 -- Set True if we find at least one component with a component
1735 -- clause (used to warn about useless Bit_Order pragmas, and also
1736 -- to detect cases where Implicit_Packing may have an effect).
1738 All_Scalar_Components : Boolean := True;
1739 -- Set False if we encounter a component of a non-scalar type
1741 Scalar_Component_Total_RM_Size : Uint := Uint_0;
1742 Scalar_Component_Total_Esize : Uint := Uint_0;
1743 -- Accumulates total RM_Size values and total Esize values of all
1744 -- scalar components. Used for processing of Implicit_Packing.
1746 function Check_Allocator (N : Node_Id) return Node_Id;
1747 -- If N is an allocator, possibly wrapped in one or more level of
1748 -- qualified expression(s), return the inner allocator node, else
1751 procedure Check_Itype (Typ : Entity_Id);
1752 -- If the component subtype is an access to a constrained subtype of
1753 -- an already frozen type, make the subtype frozen as well. It might
1754 -- otherwise be frozen in the wrong scope, and a freeze node on
1755 -- subtype has no effect. Similarly, if the component subtype is a
1756 -- regular (not protected) access to subprogram, set the anonymous
1757 -- subprogram type to frozen as well, to prevent an out-of-scope
1758 -- freeze node at some eventual point of call. Protected operations
1759 -- are handled elsewhere.
1761 ---------------------
1762 -- Check_Allocator --
1763 ---------------------
1765 function Check_Allocator (N : Node_Id) return Node_Id is
1770 if Nkind (Inner) = N_Allocator then
1772 elsif Nkind (Inner) = N_Qualified_Expression then
1773 Inner := Expression (Inner);
1778 end Check_Allocator;
1784 procedure Check_Itype (Typ : Entity_Id) is
1785 Desig : constant Entity_Id := Designated_Type (Typ);
1788 if not Is_Frozen (Desig)
1789 and then Is_Frozen (Base_Type (Desig))
1791 Set_Is_Frozen (Desig);
1793 -- In addition, add an Itype_Reference to ensure that the
1794 -- access subtype is elaborated early enough. This cannot be
1795 -- done if the subtype may depend on discriminants.
1797 if Ekind (Comp) = E_Component
1798 and then Is_Itype (Etype (Comp))
1799 and then not Has_Discriminants (Rec)
1801 IR := Make_Itype_Reference (Sloc (Comp));
1802 Set_Itype (IR, Desig);
1806 elsif Ekind (Typ) = E_Anonymous_Access_Subprogram_Type
1807 and then Convention (Desig) /= Convention_Protected
1809 Set_Is_Frozen (Desig);
1813 -- Start of processing for Freeze_Record_Type
1816 -- Freeze components and embedded subtypes
1818 Comp := First_Entity (Rec);
1820 while Present (Comp) loop
1822 -- First handle the component case
1824 if Ekind (Comp) = E_Component
1825 or else Ekind (Comp) = E_Discriminant
1828 CC : constant Node_Id := Component_Clause (Comp);
1831 -- Freezing a record type freezes the type of each of its
1832 -- components. However, if the type of the component is
1833 -- part of this record, we do not want or need a separate
1834 -- Freeze_Node. Note that Is_Itype is wrong because that's
1835 -- also set in private type cases. We also can't check for
1836 -- the Scope being exactly Rec because of private types and
1837 -- record extensions.
1839 if Is_Itype (Etype (Comp))
1840 and then Is_Record_Type (Underlying_Type
1841 (Scope (Etype (Comp))))
1843 Undelay_Type (Etype (Comp));
1846 Freeze_And_Append (Etype (Comp), N, Result);
1848 -- Check for error of component clause given for variable
1849 -- sized type. We have to delay this test till this point,
1850 -- since the component type has to be frozen for us to know
1851 -- if it is variable length. We omit this test in a generic
1852 -- context, it will be applied at instantiation time.
1854 if Present (CC) then
1855 Placed_Component := True;
1857 if Inside_A_Generic then
1861 Size_Known_At_Compile_Time
1862 (Underlying_Type (Etype (Comp)))
1865 ("component clause not allowed for variable " &
1866 "length component", CC);
1870 Unplaced_Component := True;
1873 -- Case of component requires byte alignment
1875 if Must_Be_On_Byte_Boundary (Etype (Comp)) then
1877 -- Set the enclosing record to also require byte align
1879 Set_Must_Be_On_Byte_Boundary (Rec);
1881 -- Check for component clause that is inconsistent with
1882 -- the required byte boundary alignment.
1885 and then Normalized_First_Bit (Comp) mod
1886 System_Storage_Unit /= 0
1889 ("component & must be byte aligned",
1890 Component_Name (Component_Clause (Comp)));
1896 -- Gather data for possible Implicit_Packing later. Note that at
1897 -- this stage we might be dealing with a real component, or with
1898 -- an implicit subtype declaration.
1900 if not Is_Scalar_Type (Etype (Comp)) then
1901 All_Scalar_Components := False;
1903 Scalar_Component_Total_RM_Size :=
1904 Scalar_Component_Total_RM_Size + RM_Size (Etype (Comp));
1905 Scalar_Component_Total_Esize :=
1906 Scalar_Component_Total_Esize + Esize (Etype (Comp));
1909 -- If the component is an Itype with Delayed_Freeze and is either
1910 -- a record or array subtype and its base type has not yet been
1911 -- frozen, we must remove this from the entity list of this record
1912 -- and put it on the entity list of the scope of its base type.
1913 -- Note that we know that this is not the type of a component
1914 -- since we cleared Has_Delayed_Freeze for it in the previous
1915 -- loop. Thus this must be the Designated_Type of an access type,
1916 -- which is the type of a component.
1919 and then Is_Type (Scope (Comp))
1920 and then Is_Composite_Type (Comp)
1921 and then Base_Type (Comp) /= Comp
1922 and then Has_Delayed_Freeze (Comp)
1923 and then not Is_Frozen (Base_Type (Comp))
1926 Will_Be_Frozen : Boolean := False;
1930 -- We have a pretty bad kludge here. Suppose Rec is subtype
1931 -- being defined in a subprogram that's created as part of
1932 -- the freezing of Rec'Base. In that case, we know that
1933 -- Comp'Base must have already been frozen by the time we
1934 -- get to elaborate this because Gigi doesn't elaborate any
1935 -- bodies until it has elaborated all of the declarative
1936 -- part. But Is_Frozen will not be set at this point because
1937 -- we are processing code in lexical order.
1939 -- We detect this case by going up the Scope chain of Rec
1940 -- and seeing if we have a subprogram scope before reaching
1941 -- the top of the scope chain or that of Comp'Base. If we
1942 -- do, then mark that Comp'Base will actually be frozen. If
1943 -- so, we merely undelay it.
1946 while Present (S) loop
1947 if Is_Subprogram (S) then
1948 Will_Be_Frozen := True;
1950 elsif S = Scope (Base_Type (Comp)) then
1957 if Will_Be_Frozen then
1958 Undelay_Type (Comp);
1960 if Present (Prev) then
1961 Set_Next_Entity (Prev, Next_Entity (Comp));
1963 Set_First_Entity (Rec, Next_Entity (Comp));
1966 -- Insert in entity list of scope of base type (which
1967 -- must be an enclosing scope, because still unfrozen).
1969 Append_Entity (Comp, Scope (Base_Type (Comp)));
1973 -- If the component is an access type with an allocator as default
1974 -- value, the designated type will be frozen by the corresponding
1975 -- expression in init_proc. In order to place the freeze node for
1976 -- the designated type before that for the current record type,
1979 -- Same process if the component is an array of access types,
1980 -- initialized with an aggregate. If the designated type is
1981 -- private, it cannot contain allocators, and it is premature
1982 -- to freeze the type, so we check for this as well.
1984 elsif Is_Access_Type (Etype (Comp))
1985 and then Present (Parent (Comp))
1986 and then Present (Expression (Parent (Comp)))
1989 Alloc : constant Node_Id :=
1990 Check_Allocator (Expression (Parent (Comp)));
1993 if Present (Alloc) then
1995 -- If component is pointer to a classwide type, freeze
1996 -- the specific type in the expression being allocated.
1997 -- The expression may be a subtype indication, in which
1998 -- case freeze the subtype mark.
2000 if Is_Class_Wide_Type
2001 (Designated_Type (Etype (Comp)))
2003 if Is_Entity_Name (Expression (Alloc)) then
2005 (Entity (Expression (Alloc)), N, Result);
2007 Nkind (Expression (Alloc)) = N_Subtype_Indication
2010 (Entity (Subtype_Mark (Expression (Alloc))),
2014 elsif Is_Itype (Designated_Type (Etype (Comp))) then
2015 Check_Itype (Etype (Comp));
2019 (Designated_Type (Etype (Comp)), N, Result);
2024 elsif Is_Access_Type (Etype (Comp))
2025 and then Is_Itype (Designated_Type (Etype (Comp)))
2027 Check_Itype (Etype (Comp));
2029 elsif Is_Array_Type (Etype (Comp))
2030 and then Is_Access_Type (Component_Type (Etype (Comp)))
2031 and then Present (Parent (Comp))
2032 and then Nkind (Parent (Comp)) = N_Component_Declaration
2033 and then Present (Expression (Parent (Comp)))
2034 and then Nkind (Expression (Parent (Comp))) = N_Aggregate
2035 and then Is_Fully_Defined
2036 (Designated_Type (Component_Type (Etype (Comp))))
2040 (Component_Type (Etype (Comp))), N, Result);
2047 -- Deal with pragma Bit_Order setting non-standard bit order
2049 if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then
2050 if not Placed_Component then
2052 Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
2053 Error_Msg_N ("?Bit_Order specification has no effect", ADC);
2055 ("\?since no component clauses were specified", ADC);
2057 -- Here is where we do the processing for reversed bit order
2060 Adjust_Record_For_Reverse_Bit_Order (Rec);
2064 -- Complete error checking on record representation clause (e.g.
2065 -- overlap of components). This is called after adjusting the
2066 -- record for reverse bit order.
2069 RRC : constant Node_Id := Get_Record_Representation_Clause (Rec);
2071 if Present (RRC) then
2072 Check_Record_Representation_Clause (RRC);
2076 -- Set OK_To_Reorder_Components depending on debug flags
2078 if Is_Base_Type (Rec) and then Convention (Rec) = Convention_Ada then
2079 if (Has_Discriminants (Rec) and then Debug_Flag_Dot_V)
2081 (not Has_Discriminants (Rec) and then Debug_Flag_Dot_R)
2083 Set_OK_To_Reorder_Components (Rec);
2087 -- Check for useless pragma Pack when all components placed. We only
2088 -- do this check for record types, not subtypes, since a subtype may
2089 -- have all its components placed, and it still makes perfectly good
2090 -- sense to pack other subtypes or the parent type. We do not give
2091 -- this warning if Optimize_Alignment is set to Space, since the
2092 -- pragma Pack does have an effect in this case (it always resets
2093 -- the alignment to one).
2095 if Ekind (Rec) = E_Record_Type
2096 and then Is_Packed (Rec)
2097 and then not Unplaced_Component
2098 and then Optimize_Alignment /= 'S'
2100 -- Reset packed status. Probably not necessary, but we do it so
2101 -- that there is no chance of the back end doing something strange
2102 -- with this redundant indication of packing.
2104 Set_Is_Packed (Rec, False);
2106 -- Give warning if redundant constructs warnings on
2108 if Warn_On_Redundant_Constructs then
2109 Error_Msg_N -- CODEFIX
2110 ("?pragma Pack has no effect, no unplaced components",
2111 Get_Rep_Pragma (Rec, Name_Pack));
2115 -- If this is the record corresponding to a remote type, freeze the
2116 -- remote type here since that is what we are semantically freezing.
2117 -- This prevents the freeze node for that type in an inner scope.
2119 -- Also, Check for controlled components and unchecked unions.
2120 -- Finally, enforce the restriction that access attributes with a
2121 -- current instance prefix can only apply to limited types.
2123 if Ekind (Rec) = E_Record_Type then
2124 if Present (Corresponding_Remote_Type (Rec)) then
2125 Freeze_And_Append (Corresponding_Remote_Type (Rec), N, Result);
2128 Comp := First_Component (Rec);
2129 while Present (Comp) loop
2131 -- Do not set Has_Controlled_Component on a class-wide
2132 -- equivalent type. See Make_CW_Equivalent_Type.
2134 if not Is_Class_Wide_Equivalent_Type (Rec)
2135 and then (Has_Controlled_Component (Etype (Comp))
2136 or else (Chars (Comp) /= Name_uParent
2137 and then Is_Controlled (Etype (Comp)))
2138 or else (Is_Protected_Type (Etype (Comp))
2140 (Corresponding_Record_Type
2142 and then Has_Controlled_Component
2143 (Corresponding_Record_Type
2146 Set_Has_Controlled_Component (Rec);
2150 if Has_Unchecked_Union (Etype (Comp)) then
2151 Set_Has_Unchecked_Union (Rec);
2154 if Has_Per_Object_Constraint (Comp) then
2156 -- Scan component declaration for likely misuses of current
2157 -- instance, either in a constraint or a default expression.
2159 Check_Current_Instance (Parent (Comp));
2162 Next_Component (Comp);
2166 Set_Component_Alignment_If_Not_Set (Rec);
2168 -- For first subtypes, check if there are any fixed-point fields with
2169 -- component clauses, where we must check the size. This is not done
2170 -- till the freeze point, since for fixed-point types, we do not know
2171 -- the size until the type is frozen. Similar processing applies to
2172 -- bit packed arrays.
2174 if Is_First_Subtype (Rec) then
2175 Comp := First_Component (Rec);
2176 while Present (Comp) loop
2177 if Present (Component_Clause (Comp))
2178 and then (Is_Fixed_Point_Type (Etype (Comp))
2180 Is_Bit_Packed_Array (Etype (Comp)))
2183 (Component_Name (Component_Clause (Comp)),
2189 Next_Component (Comp);
2193 -- Generate warning for applying C or C++ convention to a record
2194 -- with discriminants. This is suppressed for the unchecked union
2195 -- case, since the whole point in this case is interface C. We also
2196 -- do not generate this within instantiations, since we will have
2197 -- generated a message on the template.
2199 if Has_Discriminants (E)
2200 and then not Is_Unchecked_Union (E)
2201 and then (Convention (E) = Convention_C
2203 Convention (E) = Convention_CPP)
2204 and then Comes_From_Source (E)
2205 and then not In_Instance
2206 and then not Has_Warnings_Off (E)
2207 and then not Has_Warnings_Off (Base_Type (E))
2210 Cprag : constant Node_Id := Get_Rep_Pragma (E, Name_Convention);
2214 if Present (Cprag) then
2215 A2 := Next (First (Pragma_Argument_Associations (Cprag)));
2217 if Convention (E) = Convention_C then
2219 ("?variant record has no direct equivalent in C", A2);
2222 ("?variant record has no direct equivalent in C++", A2);
2226 ("\?use of convention for type& is dubious", A2, E);
2231 -- See if Size is too small as is (and implicit packing might help)
2233 if not Is_Packed (Rec)
2235 -- No implicit packing if even one component is explicitly placed
2237 and then not Placed_Component
2239 -- Must have size clause and all scalar components
2241 and then Has_Size_Clause (Rec)
2242 and then All_Scalar_Components
2244 -- Do not try implicit packing on records with discriminants, too
2245 -- complicated, especially in the variant record case.
2247 and then not Has_Discriminants (Rec)
2249 -- We can implicitly pack if the specified size of the record is
2250 -- less than the sum of the object sizes (no point in packing if
2251 -- this is not the case).
2253 and then Esize (Rec) < Scalar_Component_Total_Esize
2255 -- And the total RM size cannot be greater than the specified size
2256 -- since otherwise packing will not get us where we have to be!
2258 and then Esize (Rec) >= Scalar_Component_Total_RM_Size
2260 -- Never do implicit packing in CodePeer mode since we don't do
2261 -- any packing in this mode, since this generates over-complex
2262 -- code that confuses CodePeer, and in general, CodePeer does not
2263 -- care about the internal representation of objects.
2265 and then not CodePeer_Mode
2267 -- If implicit packing enabled, do it
2269 if Implicit_Packing then
2270 Set_Is_Packed (Rec);
2272 -- Otherwise flag the size clause
2276 Sz : constant Node_Id := Size_Clause (Rec);
2278 Error_Msg_NE -- CODEFIX
2279 ("size given for& too small", Sz, Rec);
2280 Error_Msg_N -- CODEFIX
2281 ("\use explicit pragma Pack "
2282 & "or use pragma Implicit_Packing", Sz);
2286 end Freeze_Record_Type;
2288 -- Start of processing for Freeze_Entity
2291 -- We are going to test for various reasons why this entity need not be
2292 -- frozen here, but in the case of an Itype that's defined within a
2293 -- record, that test actually applies to the record.
2295 if Is_Itype (E) and then Is_Record_Type (Scope (E)) then
2296 Test_E := Scope (E);
2297 elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E)))
2298 and then Is_Record_Type (Underlying_Type (Scope (E)))
2300 Test_E := Underlying_Type (Scope (E));
2303 -- Do not freeze if already frozen since we only need one freeze node
2305 if Is_Frozen (E) then
2308 -- It is improper to freeze an external entity within a generic because
2309 -- its freeze node will appear in a non-valid context. The entity will
2310 -- be frozen in the proper scope after the current generic is analyzed.
2312 elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then
2315 -- Do not freeze a global entity within an inner scope created during
2316 -- expansion. A call to subprogram E within some internal procedure
2317 -- (a stream attribute for example) might require freezing E, but the
2318 -- freeze node must appear in the same declarative part as E itself.
2319 -- The two-pass elaboration mechanism in gigi guarantees that E will
2320 -- be frozen before the inner call is elaborated. We exclude constants
2321 -- from this test, because deferred constants may be frozen early, and
2322 -- must be diagnosed (e.g. in the case of a deferred constant being used
2323 -- in a default expression). If the enclosing subprogram comes from
2324 -- source, or is a generic instance, then the freeze point is the one
2325 -- mandated by the language, and we freeze the entity. A subprogram that
2326 -- is a child unit body that acts as a spec does not have a spec that
2327 -- comes from source, but can only come from source.
2329 elsif In_Open_Scopes (Scope (Test_E))
2330 and then Scope (Test_E) /= Current_Scope
2331 and then Ekind (Test_E) /= E_Constant
2338 while Present (S) loop
2339 if Is_Overloadable (S) then
2340 if Comes_From_Source (S)
2341 or else Is_Generic_Instance (S)
2342 or else Is_Child_Unit (S)
2354 -- Similarly, an inlined instance body may make reference to global
2355 -- entities, but these references cannot be the proper freezing point
2356 -- for them, and in the absence of inlining freezing will take place in
2357 -- their own scope. Normally instance bodies are analyzed after the
2358 -- enclosing compilation, and everything has been frozen at the proper
2359 -- place, but with front-end inlining an instance body is compiled
2360 -- before the end of the enclosing scope, and as a result out-of-order
2361 -- freezing must be prevented.
2363 elsif Front_End_Inlining
2364 and then In_Instance_Body
2365 and then Present (Scope (Test_E))
2371 S := Scope (Test_E);
2372 while Present (S) loop
2373 if Is_Generic_Instance (S) then
2386 -- Deal with delayed aspect specifications. The analysis of the aspect
2387 -- is required to be delayed to the freeze point, so we evaluate the
2388 -- pragma or attribute definition clause in the tree at this point.
2390 if Has_Delayed_Aspects (E) then
2396 -- Look for aspect specification entries for this entity
2398 Ritem := First_Rep_Item (E);
2399 while Present (Ritem) loop
2400 if Nkind (Ritem) = N_Aspect_Specification
2401 and then Entity (Ritem) = E
2402 and then Is_Delayed_Aspect (Ritem)
2404 Aitem := Aspect_Rep_Item (Ritem);
2406 -- Skip if this is an aspect with no corresponding pragma
2407 -- or attribute definition node (such as Default_Value).
2409 if Present (Aitem) then
2410 Set_Parent (Aitem, Ritem);
2415 Next_Rep_Item (Ritem);
2420 -- Here to freeze the entity
2424 -- Case of entity being frozen is other than a type
2426 if not Is_Type (E) then
2428 -- If entity is exported or imported and does not have an external
2429 -- name, now is the time to provide the appropriate default name.
2430 -- Skip this if the entity is stubbed, since we don't need a name
2431 -- for any stubbed routine. For the case on intrinsics, if no
2432 -- external name is specified, then calls will be handled in
2433 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
2434 -- external name is provided, then Expand_Intrinsic_Call leaves
2435 -- calls in place for expansion by GIGI.
2437 if (Is_Imported (E) or else Is_Exported (E))
2438 and then No (Interface_Name (E))
2439 and then Convention (E) /= Convention_Stubbed
2440 and then Convention (E) /= Convention_Intrinsic
2442 Set_Encoded_Interface_Name
2443 (E, Get_Default_External_Name (E));
2445 -- If entity is an atomic object appearing in a declaration and
2446 -- the expression is an aggregate, assign it to a temporary to
2447 -- ensure that the actual assignment is done atomically rather
2448 -- than component-wise (the assignment to the temp may be done
2449 -- component-wise, but that is harmless).
2452 and then Nkind (Parent (E)) = N_Object_Declaration
2453 and then Present (Expression (Parent (E)))
2454 and then Nkind (Expression (Parent (E))) = N_Aggregate
2455 and then Is_Atomic_Aggregate (Expression (Parent (E)), Etype (E))
2460 -- For a subprogram, freeze all parameter types and also the return
2461 -- type (RM 13.14(14)). However skip this for internal subprograms.
2462 -- This is also the point where any extra formal parameters are
2463 -- created since we now know whether the subprogram will use a
2464 -- foreign convention.
2466 if Is_Subprogram (E) then
2467 if not Is_Internal (E) then
2471 Warn_Node : Node_Id;
2474 -- Loop through formals
2476 Formal := First_Formal (E);
2477 while Present (Formal) loop
2478 F_Type := Etype (Formal);
2479 Freeze_And_Append (F_Type, N, Result);
2481 if Is_Private_Type (F_Type)
2482 and then Is_Private_Type (Base_Type (F_Type))
2483 and then No (Full_View (Base_Type (F_Type)))
2484 and then not Is_Generic_Type (F_Type)
2485 and then not Is_Derived_Type (F_Type)
2487 -- If the type of a formal is incomplete, subprogram
2488 -- is being frozen prematurely. Within an instance
2489 -- (but not within a wrapper package) this is an
2490 -- artifact of our need to regard the end of an
2491 -- instantiation as a freeze point. Otherwise it is
2492 -- a definite error.
2495 Set_Is_Frozen (E, False);
2498 elsif not After_Last_Declaration
2499 and then not Freezing_Library_Level_Tagged_Type
2501 Error_Msg_Node_1 := F_Type;
2503 ("type& must be fully defined before this point",
2508 -- Check suspicious parameter for C function. These tests
2509 -- apply only to exported/imported subprograms.
2511 if Warn_On_Export_Import
2512 and then Comes_From_Source (E)
2513 and then (Convention (E) = Convention_C
2515 Convention (E) = Convention_CPP)
2516 and then (Is_Imported (E) or else Is_Exported (E))
2517 and then Convention (E) /= Convention (Formal)
2518 and then not Has_Warnings_Off (E)
2519 and then not Has_Warnings_Off (F_Type)
2520 and then not Has_Warnings_Off (Formal)
2522 -- Qualify mention of formals with subprogram name
2524 Error_Msg_Qual_Level := 1;
2526 -- Check suspicious use of fat C pointer
2528 if Is_Access_Type (F_Type)
2529 and then Esize (F_Type) > Ttypes.System_Address_Size
2532 ("?type of & does not correspond to C pointer!",
2535 -- Check suspicious return of boolean
2537 elsif Root_Type (F_Type) = Standard_Boolean
2538 and then Convention (F_Type) = Convention_Ada
2539 and then not Has_Warnings_Off (F_Type)
2540 and then not Has_Size_Clause (F_Type)
2541 and then VM_Target = No_VM
2543 Error_Msg_N ("& is an 8-bit Ada Boolean?", Formal);
2545 ("\use appropriate corresponding type in C "
2546 & "(e.g. char)?", Formal);
2548 -- Check suspicious tagged type
2550 elsif (Is_Tagged_Type (F_Type)
2551 or else (Is_Access_Type (F_Type)
2554 (Designated_Type (F_Type))))
2555 and then Convention (E) = Convention_C
2558 ("?& involves a tagged type which does not "
2559 & "correspond to any C type!", Formal);
2561 -- Check wrong convention subprogram pointer
2563 elsif Ekind (F_Type) = E_Access_Subprogram_Type
2564 and then not Has_Foreign_Convention (F_Type)
2567 ("?subprogram pointer & should "
2568 & "have foreign convention!", Formal);
2569 Error_Msg_Sloc := Sloc (F_Type);
2571 ("\?add Convention pragma to declaration of &#",
2575 -- Turn off name qualification after message output
2577 Error_Msg_Qual_Level := 0;
2580 -- Check for unconstrained array in exported foreign
2583 if Has_Foreign_Convention (E)
2584 and then not Is_Imported (E)
2585 and then Is_Array_Type (F_Type)
2586 and then not Is_Constrained (F_Type)
2587 and then Warn_On_Export_Import
2589 -- Exclude VM case, since both .NET and JVM can handle
2590 -- unconstrained arrays without a problem.
2592 and then VM_Target = No_VM
2594 Error_Msg_Qual_Level := 1;
2596 -- If this is an inherited operation, place the
2597 -- warning on the derived type declaration, rather
2598 -- than on the original subprogram.
2600 if Nkind (Original_Node (Parent (E))) =
2601 N_Full_Type_Declaration
2603 Warn_Node := Parent (E);
2605 if Formal = First_Formal (E) then
2607 ("?in inherited operation&", Warn_Node, E);
2610 Warn_Node := Formal;
2614 ("?type of argument& is unconstrained array",
2617 ("?foreign caller must pass bounds explicitly",
2619 Error_Msg_Qual_Level := 0;
2622 if not From_With_Type (F_Type) then
2623 if Is_Access_Type (F_Type) then
2624 F_Type := Designated_Type (F_Type);
2627 -- If the formal is an anonymous_access_to_subprogram
2628 -- freeze the subprogram type as well, to prevent
2629 -- scope anomalies in gigi, because there is no other
2630 -- clear point at which it could be frozen.
2632 if Is_Itype (Etype (Formal))
2633 and then Ekind (F_Type) = E_Subprogram_Type
2635 Freeze_And_Append (F_Type, N, Result);
2639 Next_Formal (Formal);
2642 -- Case of function: similar checks on return type
2644 if Ekind (E) = E_Function then
2646 -- Freeze return type
2648 R_Type := Etype (E);
2649 Freeze_And_Append (R_Type, N, Result);
2651 -- Check suspicious return type for C function
2653 if Warn_On_Export_Import
2654 and then (Convention (E) = Convention_C
2656 Convention (E) = Convention_CPP)
2657 and then (Is_Imported (E) or else Is_Exported (E))
2659 -- Check suspicious return of fat C pointer
2661 if Is_Access_Type (R_Type)
2662 and then Esize (R_Type) > Ttypes.System_Address_Size
2663 and then not Has_Warnings_Off (E)
2664 and then not Has_Warnings_Off (R_Type)
2667 ("?return type of& does not "
2668 & "correspond to C pointer!", E);
2670 -- Check suspicious return of boolean
2672 elsif Root_Type (R_Type) = Standard_Boolean
2673 and then Convention (R_Type) = Convention_Ada
2674 and then VM_Target = No_VM
2675 and then not Has_Warnings_Off (E)
2676 and then not Has_Warnings_Off (R_Type)
2677 and then not Has_Size_Clause (R_Type)
2680 N : constant Node_Id :=
2681 Result_Definition (Declaration_Node (E));
2684 ("return type of & is an 8-bit Ada Boolean?",
2687 ("\use appropriate corresponding type in C "
2688 & "(e.g. char)?", N, E);
2691 -- Check suspicious return tagged type
2693 elsif (Is_Tagged_Type (R_Type)
2694 or else (Is_Access_Type (R_Type)
2697 (Designated_Type (R_Type))))
2698 and then Convention (E) = Convention_C
2699 and then not Has_Warnings_Off (E)
2700 and then not Has_Warnings_Off (R_Type)
2703 ("?return type of & does not "
2704 & "correspond to C type!", E);
2706 -- Check return of wrong convention subprogram pointer
2708 elsif Ekind (R_Type) = E_Access_Subprogram_Type
2709 and then not Has_Foreign_Convention (R_Type)
2710 and then not Has_Warnings_Off (E)
2711 and then not Has_Warnings_Off (R_Type)
2714 ("?& should return a foreign "
2715 & "convention subprogram pointer", E);
2716 Error_Msg_Sloc := Sloc (R_Type);
2718 ("\?add Convention pragma to declaration of& #",
2723 -- Give warning for suspicious return of a result of an
2724 -- unconstrained array type in a foreign convention
2727 if Has_Foreign_Convention (E)
2729 -- We are looking for a return of unconstrained array
2731 and then Is_Array_Type (R_Type)
2732 and then not Is_Constrained (R_Type)
2734 -- Exclude imported routines, the warning does not
2735 -- belong on the import, but rather on the routine
2738 and then not Is_Imported (E)
2740 -- Exclude VM case, since both .NET and JVM can handle
2741 -- return of unconstrained arrays without a problem.
2743 and then VM_Target = No_VM
2745 -- Check that general warning is enabled, and that it
2746 -- is not suppressed for this particular case.
2748 and then Warn_On_Export_Import
2749 and then not Has_Warnings_Off (E)
2750 and then not Has_Warnings_Off (R_Type)
2753 ("?foreign convention function& should not " &
2754 "return unconstrained array!", E);
2760 -- Must freeze its parent first if it is a derived subprogram
2762 if Present (Alias (E)) then
2763 Freeze_And_Append (Alias (E), N, Result);
2766 -- We don't freeze internal subprograms, because we don't normally
2767 -- want addition of extra formals or mechanism setting to happen
2768 -- for those. However we do pass through predefined dispatching
2769 -- cases, since extra formals may be needed in some cases, such as
2770 -- for the stream 'Input function (build-in-place formals).
2772 if not Is_Internal (E)
2773 or else Is_Predefined_Dispatching_Operation (E)
2775 Freeze_Subprogram (E);
2778 -- Here for other than a subprogram or type
2781 -- If entity has a type, and it is not a generic unit, then
2782 -- freeze it first (RM 13.14(10)).
2784 if Present (Etype (E))
2785 and then Ekind (E) /= E_Generic_Function
2787 Freeze_And_Append (Etype (E), N, Result);
2790 -- Special processing for objects created by object declaration
2792 if Nkind (Declaration_Node (E)) = N_Object_Declaration then
2794 -- Abstract type allowed only for C++ imported variables or
2797 -- Note: we inhibit this check for objects that do not come
2798 -- from source because there is at least one case (the
2799 -- expansion of x'class'input where x is abstract) where we
2800 -- legitimately generate an abstract object.
2802 if Is_Abstract_Type (Etype (E))
2803 and then Comes_From_Source (Parent (E))
2804 and then not (Is_Imported (E)
2805 and then Is_CPP_Class (Etype (E)))
2807 Error_Msg_N ("type of object cannot be abstract",
2808 Object_Definition (Parent (E)));
2810 if Is_CPP_Class (Etype (E)) then
2812 ("\} may need a cpp_constructor",
2813 Object_Definition (Parent (E)), Etype (E));
2817 -- For object created by object declaration, perform required
2818 -- categorization (preelaborate and pure) checks. Defer these
2819 -- checks to freeze time since pragma Import inhibits default
2820 -- initialization and thus pragma Import affects these checks.
2822 Validate_Object_Declaration (Declaration_Node (E));
2824 -- If there is an address clause, check that it is valid
2826 Check_Address_Clause (E);
2828 -- If the object needs any kind of default initialization, an
2829 -- error must be issued if No_Default_Initialization applies.
2830 -- The check doesn't apply to imported objects, which are not
2831 -- ever default initialized, and is why the check is deferred
2832 -- until freezing, at which point we know if Import applies.
2833 -- Deferred constants are also exempted from this test because
2834 -- their completion is explicit, or through an import pragma.
2836 if Ekind (E) = E_Constant
2837 and then Present (Full_View (E))
2841 elsif Comes_From_Source (E)
2842 and then not Is_Imported (E)
2843 and then not Has_Init_Expression (Declaration_Node (E))
2845 ((Has_Non_Null_Base_Init_Proc (Etype (E))
2846 and then not No_Initialization (Declaration_Node (E))
2847 and then not Is_Value_Type (Etype (E))
2848 and then not Initialization_Suppressed (Etype (E)))
2850 (Needs_Simple_Initialization (Etype (E))
2851 and then not Is_Internal (E)))
2853 Has_Default_Initialization := True;
2855 (No_Default_Initialization, Declaration_Node (E));
2858 -- Check that a Thread_Local_Storage variable does not have
2859 -- default initialization, and any explicit initialization must
2860 -- either be the null constant or a static constant.
2862 if Has_Pragma_Thread_Local_Storage (E) then
2864 Decl : constant Node_Id := Declaration_Node (E);
2866 if Has_Default_Initialization
2868 (Has_Init_Expression (Decl)
2870 (No (Expression (Decl))
2872 (Is_Static_Expression (Expression (Decl))
2874 Nkind (Expression (Decl)) = N_Null)))
2877 ("Thread_Local_Storage variable& is "
2878 & "improperly initialized", Decl, E);
2880 ("\only allowed initialization is explicit "
2881 & "NULL or static expression", Decl, E);
2886 -- For imported objects, set Is_Public unless there is also an
2887 -- address clause, which means that there is no external symbol
2888 -- needed for the Import (Is_Public may still be set for other
2889 -- unrelated reasons). Note that we delayed this processing
2890 -- till freeze time so that we can be sure not to set the flag
2891 -- if there is an address clause. If there is such a clause,
2892 -- then the only purpose of the Import pragma is to suppress
2893 -- implicit initialization.
2896 and then No (Address_Clause (E))
2901 -- For convention C objects of an enumeration type, warn if
2902 -- the size is not integer size and no explicit size given.
2903 -- Skip warning for Boolean, and Character, assume programmer
2904 -- expects 8-bit sizes for these cases.
2906 if (Convention (E) = Convention_C
2908 Convention (E) = Convention_CPP)
2909 and then Is_Enumeration_Type (Etype (E))
2910 and then not Is_Character_Type (Etype (E))
2911 and then not Is_Boolean_Type (Etype (E))
2912 and then Esize (Etype (E)) < Standard_Integer_Size
2913 and then not Has_Size_Clause (E)
2915 Error_Msg_Uint_1 := UI_From_Int (Standard_Integer_Size);
2917 ("?convention C enumeration object has size less than ^",
2919 Error_Msg_N ("\?use explicit size clause to set size", E);
2923 -- Check that a constant which has a pragma Volatile[_Components]
2924 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
2926 -- Note: Atomic[_Components] also sets Volatile[_Components]
2928 if Ekind (E) = E_Constant
2929 and then (Has_Volatile_Components (E) or else Is_Volatile (E))
2930 and then not Is_Imported (E)
2932 -- Make sure we actually have a pragma, and have not merely
2933 -- inherited the indication from elsewhere (e.g. an address
2934 -- clause, which is not good enough in RM terms!)
2936 if Has_Rep_Pragma (E, Name_Atomic)
2938 Has_Rep_Pragma (E, Name_Atomic_Components)
2941 ("stand alone atomic constant must be " &
2942 "imported (RM C.6(13))", E);
2944 elsif Has_Rep_Pragma (E, Name_Volatile)
2946 Has_Rep_Pragma (E, Name_Volatile_Components)
2949 ("stand alone volatile constant must be " &
2950 "imported (RM C.6(13))", E);
2954 -- Static objects require special handling
2956 if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
2957 and then Is_Statically_Allocated (E)
2959 Freeze_Static_Object (E);
2962 -- Remaining step is to layout objects
2964 if Ekind (E) = E_Variable
2966 Ekind (E) = E_Constant
2968 Ekind (E) = E_Loop_Parameter
2976 -- Case of a type or subtype being frozen
2979 -- We used to check here that a full type must have preelaborable
2980 -- initialization if it completes a private type specified with
2981 -- pragma Preelaborable_Initialization, but that missed cases where
2982 -- the types occur within a generic package, since the freezing
2983 -- that occurs within a containing scope generally skips traversal
2984 -- of a generic unit's declarations (those will be frozen within
2985 -- instances). This check was moved to Analyze_Package_Specification.
2987 -- The type may be defined in a generic unit. This can occur when
2988 -- freezing a generic function that returns the type (which is
2989 -- defined in a parent unit). It is clearly meaningless to freeze
2990 -- this type. However, if it is a subtype, its size may be determi-
2991 -- nable and used in subsequent checks, so might as well try to
2994 if Present (Scope (E))
2995 and then Is_Generic_Unit (Scope (E))
2997 Check_Compile_Time_Size (E);
3001 -- Deal with special cases of freezing for subtype
3003 if E /= Base_Type (E) then
3005 -- Before we do anything else, a specialized test for the case of
3006 -- a size given for an array where the array needs to be packed,
3007 -- but was not so the size cannot be honored. This would of course
3008 -- be caught by the backend, and indeed we don't catch all cases.
3009 -- The point is that we can give a better error message in those
3010 -- cases that we do catch with the circuitry here. Also if pragma
3011 -- Implicit_Packing is set, this is where the packing occurs.
3013 -- The reason we do this so early is that the processing in the
3014 -- automatic packing case affects the layout of the base type, so
3015 -- it must be done before we freeze the base type.
3017 if Is_Array_Type (E) then
3020 Ctyp : constant Entity_Id := Component_Type (E);
3023 -- Check enabling conditions. These are straightforward
3024 -- except for the test for a limited composite type. This
3025 -- eliminates the rare case of a array of limited components
3026 -- where there are issues of whether or not we can go ahead
3027 -- and pack the array (since we can't freely pack and unpack
3028 -- arrays if they are limited).
3030 -- Note that we check the root type explicitly because the
3031 -- whole point is we are doing this test before we have had
3032 -- a chance to freeze the base type (and it is that freeze
3033 -- action that causes stuff to be inherited).
3035 if Present (Size_Clause (E))
3036 and then Known_Static_Esize (E)
3037 and then not Is_Packed (E)
3038 and then not Has_Pragma_Pack (E)
3039 and then Number_Dimensions (E) = 1
3040 and then not Has_Component_Size_Clause (E)
3041 and then Known_Static_Esize (Ctyp)
3042 and then not Is_Limited_Composite (E)
3043 and then not Is_Packed (Root_Type (E))
3044 and then not Has_Component_Size_Clause (Root_Type (E))
3045 and then not CodePeer_Mode
3047 Get_Index_Bounds (First_Index (E), Lo, Hi);
3049 if Compile_Time_Known_Value (Lo)
3050 and then Compile_Time_Known_Value (Hi)
3051 and then Known_Static_RM_Size (Ctyp)
3052 and then RM_Size (Ctyp) < 64
3055 Lov : constant Uint := Expr_Value (Lo);
3056 Hiv : constant Uint := Expr_Value (Hi);
3057 Len : constant Uint := UI_Max
3060 Rsiz : constant Uint := RM_Size (Ctyp);
3061 SZ : constant Node_Id := Size_Clause (E);
3062 Btyp : constant Entity_Id := Base_Type (E);
3064 -- What we are looking for here is the situation where
3065 -- the RM_Size given would be exactly right if there
3066 -- was a pragma Pack (resulting in the component size
3067 -- being the same as the RM_Size). Furthermore, the
3068 -- component type size must be an odd size (not a
3069 -- multiple of storage unit). If the component RM size
3070 -- is an exact number of storage units that is a power
3071 -- of two, the array is not packed and has a standard
3075 if RM_Size (E) = Len * Rsiz
3076 and then Rsiz mod System_Storage_Unit /= 0
3078 -- For implicit packing mode, just set the
3079 -- component size silently.
3081 if Implicit_Packing then
3082 Set_Component_Size (Btyp, Rsiz);
3083 Set_Is_Bit_Packed_Array (Btyp);
3084 Set_Is_Packed (Btyp);
3085 Set_Has_Non_Standard_Rep (Btyp);
3087 -- Otherwise give an error message
3091 ("size given for& too small", SZ, E);
3092 Error_Msg_N -- CODEFIX
3093 ("\use explicit pragma Pack "
3094 & "or use pragma Implicit_Packing", SZ);
3097 elsif RM_Size (E) = Len * Rsiz
3098 and then Implicit_Packing
3100 (Rsiz / System_Storage_Unit = 1
3101 or else Rsiz / System_Storage_Unit = 2
3102 or else Rsiz / System_Storage_Unit = 4)
3105 -- Not a packed array, but indicate the desired
3106 -- component size, for the back-end.
3108 Set_Component_Size (Btyp, Rsiz);
3116 -- If ancestor subtype present, freeze that first. Note that this
3117 -- will also get the base type frozen. Need RM reference ???
3119 Atype := Ancestor_Subtype (E);
3121 if Present (Atype) then
3122 Freeze_And_Append (Atype, N, Result);
3124 -- No ancestor subtype present
3127 -- See if we have a nearest ancestor that has a predicate.
3128 -- That catches the case of derived type with a predicate.
3129 -- Need RM reference here ???
3131 Atype := Nearest_Ancestor (E);
3133 if Present (Atype) and then Has_Predicates (Atype) then
3134 Freeze_And_Append (Atype, N, Result);
3137 -- Freeze base type before freezing the entity (RM 13.14(15))
3139 if E /= Base_Type (E) then
3140 Freeze_And_Append (Base_Type (E), N, Result);
3144 -- For a derived type, freeze its parent type first (RM 13.14(15))
3146 elsif Is_Derived_Type (E) then
3147 Freeze_And_Append (Etype (E), N, Result);
3148 Freeze_And_Append (First_Subtype (Etype (E)), N, Result);
3151 -- For array type, freeze index types and component type first
3152 -- before freezing the array (RM 13.14(15)).
3154 if Is_Array_Type (E) then
3156 FS : constant Entity_Id := First_Subtype (E);
3157 Ctyp : constant Entity_Id := Component_Type (E);
3160 Non_Standard_Enum : Boolean := False;
3161 -- Set true if any of the index types is an enumeration type
3162 -- with a non-standard representation.
3165 Freeze_And_Append (Ctyp, N, Result);
3167 Indx := First_Index (E);
3168 while Present (Indx) loop
3169 Freeze_And_Append (Etype (Indx), N, Result);
3171 if Is_Enumeration_Type (Etype (Indx))
3172 and then Has_Non_Standard_Rep (Etype (Indx))
3174 Non_Standard_Enum := True;
3180 -- Processing that is done only for base types
3182 if Ekind (E) = E_Array_Type then
3184 -- Propagate flags for component type
3186 if Is_Controlled (Component_Type (E))
3187 or else Has_Controlled_Component (Ctyp)
3189 Set_Has_Controlled_Component (E);
3192 if Has_Unchecked_Union (Component_Type (E)) then
3193 Set_Has_Unchecked_Union (E);
3196 -- If packing was requested or if the component size was set
3197 -- explicitly, then see if bit packing is required. This
3198 -- processing is only done for base types, since all the
3199 -- representation aspects involved are type-related. This
3200 -- is not just an optimization, if we start processing the
3201 -- subtypes, they interfere with the settings on the base
3202 -- type (this is because Is_Packed has a slightly different
3203 -- meaning before and after freezing).
3210 if (Is_Packed (E) or else Has_Pragma_Pack (E))
3211 and then Known_Static_RM_Size (Ctyp)
3212 and then not Has_Component_Size_Clause (E)
3214 Csiz := UI_Max (RM_Size (Ctyp), 1);
3216 elsif Known_Component_Size (E) then
3217 Csiz := Component_Size (E);
3219 elsif not Known_Static_Esize (Ctyp) then
3223 Esiz := Esize (Ctyp);
3225 -- We can set the component size if it is less than
3226 -- 16, rounding it up to the next storage unit size.
3230 elsif Esiz <= 16 then
3236 -- Set component size up to match alignment if it
3237 -- would otherwise be less than the alignment. This
3238 -- deals with cases of types whose alignment exceeds
3239 -- their size (padded types).
3243 A : constant Uint := Alignment_In_Bits (Ctyp);
3252 -- Case of component size that may result in packing
3254 if 1 <= Csiz and then Csiz <= 64 then
3256 Ent : constant Entity_Id :=
3258 Pack_Pragma : constant Node_Id :=
3259 Get_Rep_Pragma (Ent, Name_Pack);
3260 Comp_Size_C : constant Node_Id :=
3261 Get_Attribute_Definition_Clause
3262 (Ent, Attribute_Component_Size);
3264 -- Warn if we have pack and component size so that
3265 -- the pack is ignored.
3267 -- Note: here we must check for the presence of a
3268 -- component size before checking for a Pack pragma
3269 -- to deal with the case where the array type is a
3270 -- derived type whose parent is currently private.
3272 if Present (Comp_Size_C)
3273 and then Has_Pragma_Pack (Ent)
3274 and then Warn_On_Redundant_Constructs
3276 Error_Msg_Sloc := Sloc (Comp_Size_C);
3278 ("?pragma Pack for& ignored!",
3281 ("\?explicit component size given#!",
3283 Set_Is_Packed (Base_Type (Ent), False);
3284 Set_Is_Bit_Packed_Array (Base_Type (Ent), False);
3287 -- Set component size if not already set by a
3288 -- component size clause.
3290 if not Present (Comp_Size_C) then
3291 Set_Component_Size (E, Csiz);
3294 -- Check for base type of 8, 16, 32 bits, where an
3295 -- unsigned subtype has a length one less than the
3296 -- base type (e.g. Natural subtype of Integer).
3298 -- In such cases, if a component size was not set
3299 -- explicitly, then generate a warning.
3301 if Has_Pragma_Pack (E)
3302 and then not Present (Comp_Size_C)
3304 (Csiz = 7 or else Csiz = 15 or else Csiz = 31)
3305 and then Esize (Base_Type (Ctyp)) = Csiz + 1
3307 Error_Msg_Uint_1 := Csiz;
3309 if Present (Pack_Pragma) then
3311 ("?pragma Pack causes component size "
3312 & "to be ^!", Pack_Pragma);
3314 ("\?use Component_Size to set "
3315 & "desired value!", Pack_Pragma);
3319 -- Actual packing is not needed for 8, 16, 32, 64.
3320 -- Also not needed for 24 if alignment is 1.
3326 or else (Csiz = 24 and then Alignment (Ctyp) = 1)
3328 -- Here the array was requested to be packed,
3329 -- but the packing request had no effect, so
3330 -- Is_Packed is reset.
3332 -- Note: semantically this means that we lose
3333 -- track of the fact that a derived type
3334 -- inherited a pragma Pack that was non-
3335 -- effective, but that seems fine.
3337 -- We regard a Pack pragma as a request to set
3338 -- a representation characteristic, and this
3339 -- request may be ignored.
3341 Set_Is_Packed (Base_Type (E), False);
3342 Set_Is_Bit_Packed_Array (Base_Type (E), False);
3344 if Known_Static_Esize (Component_Type (E))
3345 and then Esize (Component_Type (E)) = Csiz
3347 Set_Has_Non_Standard_Rep
3348 (Base_Type (E), False);
3351 -- In all other cases, packing is indeed needed
3354 Set_Has_Non_Standard_Rep (Base_Type (E), True);
3355 Set_Is_Bit_Packed_Array (Base_Type (E), True);
3356 Set_Is_Packed (Base_Type (E), True);
3362 -- Check for Atomic_Components or Aliased with unsuitable
3363 -- packing or explicit component size clause given.
3365 if (Has_Atomic_Components (E)
3366 or else Has_Aliased_Components (E))
3367 and then (Has_Component_Size_Clause (E)
3368 or else Is_Packed (E))
3370 Alias_Atomic_Check : declare
3372 procedure Complain_CS (T : String);
3373 -- Outputs error messages for incorrect CS clause or
3374 -- pragma Pack for aliased or atomic components (T is
3375 -- "aliased" or "atomic");
3381 procedure Complain_CS (T : String) is
3383 if Has_Component_Size_Clause (E) then
3385 Get_Attribute_Definition_Clause
3386 (FS, Attribute_Component_Size);
3388 if Known_Static_Esize (Ctyp) then
3390 ("incorrect component size for "
3391 & T & " components", Clause);
3392 Error_Msg_Uint_1 := Esize (Ctyp);
3394 ("\only allowed value is^", Clause);
3398 ("component size cannot be given for "
3399 & T & " components", Clause);
3404 ("cannot pack " & T & " components",
3405 Get_Rep_Pragma (FS, Name_Pack));
3411 -- Start of processing for Alias_Atomic_Check
3414 -- Case where component size has no effect. First
3415 -- check for object size of component type known
3416 -- and a multiple of the storage unit size.
3418 if Known_Static_Esize (Ctyp)
3419 and then Esize (Ctyp) mod System_Storage_Unit = 0
3421 -- OK in both packing case and component size case
3422 -- if RM size is known and static and the same as
3426 ((Known_Static_RM_Size (Ctyp)
3427 and then Esize (Ctyp) = RM_Size (Ctyp))
3429 -- Or if we have an explicit component size
3430 -- clause and the component size and object size
3434 (Has_Component_Size_Clause (E)
3435 and then Component_Size (E) = Esize (Ctyp)))
3439 elsif Has_Aliased_Components (E)
3440 or else Is_Aliased (Ctyp)
3442 Complain_CS ("aliased");
3444 elsif Has_Atomic_Components (E)
3445 or else Is_Atomic (Ctyp)
3447 Complain_CS ("atomic");
3449 end Alias_Atomic_Check;
3452 -- Warn for case of atomic type
3454 Clause := Get_Rep_Pragma (FS, Name_Atomic);
3457 and then not Addressable (Component_Size (FS))
3460 ("non-atomic components of type& may not be "
3461 & "accessible by separate tasks?", Clause, E);
3463 if Has_Component_Size_Clause (E) then
3466 (Get_Attribute_Definition_Clause
3467 (FS, Attribute_Component_Size));
3469 ("\because of component size clause#?",
3472 elsif Has_Pragma_Pack (E) then
3474 Sloc (Get_Rep_Pragma (FS, Name_Pack));
3476 ("\because of pragma Pack#?", Clause);
3480 -- Processing that is done only for subtypes
3483 -- Acquire alignment from base type
3485 if Unknown_Alignment (E) then
3486 Set_Alignment (E, Alignment (Base_Type (E)));
3487 Adjust_Esize_Alignment (E);
3491 -- For bit-packed arrays, check the size
3493 if Is_Bit_Packed_Array (E) and then Known_RM_Size (E) then
3495 SizC : constant Node_Id := Size_Clause (E);
3498 pragma Warnings (Off, Discard);
3501 -- It is not clear if it is possible to have no size
3502 -- clause at this stage, but it is not worth worrying
3503 -- about. Post error on the entity name in the size
3504 -- clause if present, else on the type entity itself.
3506 if Present (SizC) then
3507 Check_Size (Name (SizC), E, RM_Size (E), Discard);
3509 Check_Size (E, E, RM_Size (E), Discard);
3514 -- If any of the index types was an enumeration type with a
3515 -- non-standard rep clause, then we indicate that the array
3516 -- type is always packed (even if it is not bit packed).
3518 if Non_Standard_Enum then
3519 Set_Has_Non_Standard_Rep (Base_Type (E));
3520 Set_Is_Packed (Base_Type (E));
3523 Set_Component_Alignment_If_Not_Set (E);
3525 -- If the array is packed, we must create the packed array
3526 -- type to be used to actually implement the type. This is
3527 -- only needed for real array types (not for string literal
3528 -- types, since they are present only for the front end).
3531 and then Ekind (E) /= E_String_Literal_Subtype
3533 Create_Packed_Array_Type (E);
3534 Freeze_And_Append (Packed_Array_Type (E), N, Result);
3536 -- Size information of packed array type is copied to the
3537 -- array type, since this is really the representation. But
3538 -- do not override explicit existing size values. If the
3539 -- ancestor subtype is constrained the packed_array_type
3540 -- will be inherited from it, but the size may have been
3541 -- provided already, and must not be overridden either.
3543 if not Has_Size_Clause (E)
3545 (No (Ancestor_Subtype (E))
3546 or else not Has_Size_Clause (Ancestor_Subtype (E)))
3548 Set_Esize (E, Esize (Packed_Array_Type (E)));
3549 Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
3552 if not Has_Alignment_Clause (E) then
3553 Set_Alignment (E, Alignment (Packed_Array_Type (E)));
3557 -- For non-packed arrays set the alignment of the array to the
3558 -- alignment of the component type if it is unknown. Skip this
3559 -- in atomic case (atomic arrays may need larger alignments).
3561 if not Is_Packed (E)
3562 and then Unknown_Alignment (E)
3563 and then Known_Alignment (Ctyp)
3564 and then Known_Static_Component_Size (E)
3565 and then Known_Static_Esize (Ctyp)
3566 and then Esize (Ctyp) = Component_Size (E)
3567 and then not Is_Atomic (E)
3569 Set_Alignment (E, Alignment (Component_Type (E)));
3573 -- For a class-wide type, the corresponding specific type is
3574 -- frozen as well (RM 13.14(15))
3576 elsif Is_Class_Wide_Type (E) then
3577 Freeze_And_Append (Root_Type (E), N, Result);
3579 -- If the base type of the class-wide type is still incomplete,
3580 -- the class-wide remains unfrozen as well. This is legal when
3581 -- E is the formal of a primitive operation of some other type
3582 -- which is being frozen.
3584 if not Is_Frozen (Root_Type (E)) then
3585 Set_Is_Frozen (E, False);
3589 -- If the Class_Wide_Type is an Itype (when type is the anonymous
3590 -- parent of a derived type) and it is a library-level entity,
3591 -- generate an itype reference for it. Otherwise, its first
3592 -- explicit reference may be in an inner scope, which will be
3593 -- rejected by the back-end.
3596 and then Is_Compilation_Unit (Scope (E))
3599 Ref : constant Node_Id := Make_Itype_Reference (Loc);
3603 Add_To_Result (Ref);
3607 -- The equivalent type associated with a class-wide subtype needs
3608 -- to be frozen to ensure that its layout is done.
3610 if Ekind (E) = E_Class_Wide_Subtype
3611 and then Present (Equivalent_Type (E))
3613 Freeze_And_Append (Equivalent_Type (E), N, Result);
3616 -- For a record (sub)type, freeze all the component types (RM
3617 -- 13.14(15). We test for E_Record_(sub)Type here, rather than using
3618 -- Is_Record_Type, because we don't want to attempt the freeze for
3619 -- the case of a private type with record extension (we will do that
3620 -- later when the full type is frozen).
3622 elsif Ekind (E) = E_Record_Type
3623 or else Ekind (E) = E_Record_Subtype
3625 Freeze_Record_Type (E);
3627 -- For a concurrent type, freeze corresponding record type. This
3628 -- does not correspond to any specific rule in the RM, but the
3629 -- record type is essentially part of the concurrent type.
3630 -- Freeze as well all local entities. This includes record types
3631 -- created for entry parameter blocks, and whatever local entities
3632 -- may appear in the private part.
3634 elsif Is_Concurrent_Type (E) then
3635 if Present (Corresponding_Record_Type (E)) then
3637 (Corresponding_Record_Type (E), N, Result);
3640 Comp := First_Entity (E);
3641 while Present (Comp) loop
3642 if Is_Type (Comp) then
3643 Freeze_And_Append (Comp, N, Result);
3645 elsif (Ekind (Comp)) /= E_Function then
3646 if Is_Itype (Etype (Comp))
3647 and then Underlying_Type (Scope (Etype (Comp))) = E
3649 Undelay_Type (Etype (Comp));
3652 Freeze_And_Append (Etype (Comp), N, Result);
3658 -- Private types are required to point to the same freeze node as
3659 -- their corresponding full views. The freeze node itself has to
3660 -- point to the partial view of the entity (because from the partial
3661 -- view, we can retrieve the full view, but not the reverse).
3662 -- However, in order to freeze correctly, we need to freeze the full
3663 -- view. If we are freezing at the end of a scope (or within the
3664 -- scope of the private type), the partial and full views will have
3665 -- been swapped, the full view appears first in the entity chain and
3666 -- the swapping mechanism ensures that the pointers are properly set
3669 -- If we encounter the partial view before the full view (e.g. when
3670 -- freezing from another scope), we freeze the full view, and then
3671 -- set the pointers appropriately since we cannot rely on swapping to
3672 -- fix things up (subtypes in an outer scope might not get swapped).
3674 elsif Is_Incomplete_Or_Private_Type (E)
3675 and then not Is_Generic_Type (E)
3677 -- The construction of the dispatch table associated with library
3678 -- level tagged types forces freezing of all the primitives of the
3679 -- type, which may cause premature freezing of the partial view.
3683 -- type T is tagged private;
3684 -- type DT is new T with private;
3685 -- procedure Prim (X : in out T; Y : in out DT'class);
3687 -- type T is tagged null record;
3689 -- type DT is new T with null record;
3692 -- In this case the type will be frozen later by the usual
3693 -- mechanism: an object declaration, an instantiation, or the
3694 -- end of a declarative part.
3696 if Is_Library_Level_Tagged_Type (E)
3697 and then not Present (Full_View (E))
3699 Set_Is_Frozen (E, False);
3702 -- Case of full view present
3704 elsif Present (Full_View (E)) then
3706 -- If full view has already been frozen, then no further
3707 -- processing is required
3709 if Is_Frozen (Full_View (E)) then
3710 Set_Has_Delayed_Freeze (E, False);
3711 Set_Freeze_Node (E, Empty);
3712 Check_Debug_Info_Needed (E);
3714 -- Otherwise freeze full view and patch the pointers so that
3715 -- the freeze node will elaborate both views in the back-end.
3719 Full : constant Entity_Id := Full_View (E);
3722 if Is_Private_Type (Full)
3723 and then Present (Underlying_Full_View (Full))
3726 (Underlying_Full_View (Full), N, Result);
3729 Freeze_And_Append (Full, N, Result);
3731 if Has_Delayed_Freeze (E) then
3732 F_Node := Freeze_Node (Full);
3734 if Present (F_Node) then
3735 Set_Freeze_Node (E, F_Node);
3736 Set_Entity (F_Node, E);
3739 -- {Incomplete,Private}_Subtypes with Full_Views
3740 -- constrained by discriminants.
3742 Set_Has_Delayed_Freeze (E, False);
3743 Set_Freeze_Node (E, Empty);
3748 Check_Debug_Info_Needed (E);
3751 -- AI-117 requires that the convention of a partial view be the
3752 -- same as the convention of the full view. Note that this is a
3753 -- recognized breach of privacy, but it's essential for logical
3754 -- consistency of representation, and the lack of a rule in
3755 -- RM95 was an oversight.
3757 Set_Convention (E, Convention (Full_View (E)));
3759 Set_Size_Known_At_Compile_Time (E,
3760 Size_Known_At_Compile_Time (Full_View (E)));
3762 -- Size information is copied from the full view to the
3763 -- incomplete or private view for consistency.
3765 -- We skip this is the full view is not a type. This is very
3766 -- strange of course, and can only happen as a result of
3767 -- certain illegalities, such as a premature attempt to derive
3768 -- from an incomplete type.
3770 if Is_Type (Full_View (E)) then
3771 Set_Size_Info (E, Full_View (E));
3772 Set_RM_Size (E, RM_Size (Full_View (E)));
3777 -- Case of no full view present. If entity is derived or subtype,
3778 -- it is safe to freeze, correctness depends on the frozen status
3779 -- of parent. Otherwise it is either premature usage, or a Taft
3780 -- amendment type, so diagnosis is at the point of use and the
3781 -- type might be frozen later.
3783 elsif E /= Base_Type (E)
3784 or else Is_Derived_Type (E)
3789 Set_Is_Frozen (E, False);
3793 -- For access subprogram, freeze types of all formals, the return
3794 -- type was already frozen, since it is the Etype of the function.
3795 -- Formal types can be tagged Taft amendment types, but otherwise
3796 -- they cannot be incomplete.
3798 elsif Ekind (E) = E_Subprogram_Type then
3799 Formal := First_Formal (E);
3800 while Present (Formal) loop
3801 if Ekind (Etype (Formal)) = E_Incomplete_Type
3802 and then No (Full_View (Etype (Formal)))
3803 and then not Is_Value_Type (Etype (Formal))
3805 if Is_Tagged_Type (Etype (Formal)) then
3808 -- AI05-151: Incomplete types are allowed in access to
3809 -- subprogram specifications.
3811 elsif Ada_Version < Ada_2012 then
3813 ("invalid use of incomplete type&", E, Etype (Formal));
3817 Freeze_And_Append (Etype (Formal), N, Result);
3818 Next_Formal (Formal);
3821 Freeze_Subprogram (E);
3823 -- For access to a protected subprogram, freeze the equivalent type
3824 -- (however this is not set if we are not generating code or if this
3825 -- is an anonymous type used just for resolution).
3827 elsif Is_Access_Protected_Subprogram_Type (E) then
3828 if Present (Equivalent_Type (E)) then
3829 Freeze_And_Append (Equivalent_Type (E), N, Result);
3833 -- Generic types are never seen by the back-end, and are also not
3834 -- processed by the expander (since the expander is turned off for
3835 -- generic processing), so we never need freeze nodes for them.
3837 if Is_Generic_Type (E) then
3841 -- Some special processing for non-generic types to complete
3842 -- representation details not known till the freeze point.
3844 if Is_Fixed_Point_Type (E) then
3845 Freeze_Fixed_Point_Type (E);
3847 -- Some error checks required for ordinary fixed-point type. Defer
3848 -- these till the freeze-point since we need the small and range
3849 -- values. We only do these checks for base types
3851 if Is_Ordinary_Fixed_Point_Type (E) and then Is_Base_Type (E) then
3852 if Small_Value (E) < Ureal_2_M_80 then
3853 Error_Msg_Name_1 := Name_Small;
3855 ("`&''%` too small, minimum allowed is 2.0'*'*(-80)", E);
3857 elsif Small_Value (E) > Ureal_2_80 then
3858 Error_Msg_Name_1 := Name_Small;
3860 ("`&''%` too large, maximum allowed is 2.0'*'*80", E);
3863 if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then
3864 Error_Msg_Name_1 := Name_First;
3866 ("`&''%` too small, minimum allowed is -10.0'*'*36", E);
3869 if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then
3870 Error_Msg_Name_1 := Name_Last;
3872 ("`&''%` too large, maximum allowed is 10.0'*'*36", E);
3876 elsif Is_Enumeration_Type (E) then
3877 Freeze_Enumeration_Type (E);
3879 elsif Is_Integer_Type (E) then
3880 Adjust_Esize_For_Alignment (E);
3882 if Is_Modular_Integer_Type (E)
3883 and then Warn_On_Suspicious_Modulus_Value
3885 Check_Suspicious_Modulus (E);
3888 elsif Is_Access_Type (E) then
3890 -- If a pragma Default_Storage_Pool applies, and this type has no
3891 -- Storage_Pool or Storage_Size clause (which must have occurred
3892 -- before the freezing point), then use the default. This applies
3893 -- only to base types.
3895 if Present (Default_Pool)
3896 and then Is_Base_Type (E)
3897 and then not Has_Storage_Size_Clause (E)
3898 and then No (Associated_Storage_Pool (E))
3900 -- Case of pragma Default_Storage_Pool (null)
3902 if Nkind (Default_Pool) = N_Null then
3903 Set_No_Pool_Assigned (E);
3905 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
3908 Set_Associated_Storage_Pool (E, Entity (Default_Pool));
3912 -- Check restriction for standard storage pool
3914 if No (Associated_Storage_Pool (E)) then
3915 Check_Restriction (No_Standard_Storage_Pools, E);
3918 -- Deal with error message for pure access type. This is not an
3919 -- error in Ada 2005 if there is no pool (see AI-366).
3921 if Is_Pure_Unit_Access_Type (E)
3922 and then (Ada_Version < Ada_2005
3923 or else not No_Pool_Assigned (E))
3925 Error_Msg_N ("named access type not allowed in pure unit", E);
3927 if Ada_Version >= Ada_2005 then
3929 ("\would be legal if Storage_Size of 0 given?", E);
3931 elsif No_Pool_Assigned (E) then
3933 ("\would be legal in Ada 2005?", E);
3937 ("\would be legal in Ada 2005 if "
3938 & "Storage_Size of 0 given?", E);
3943 -- Case of composite types
3945 if Is_Composite_Type (E) then
3947 -- AI-117 requires that all new primitives of a tagged type must
3948 -- inherit the convention of the full view of the type. Inherited
3949 -- and overriding operations are defined to inherit the convention
3950 -- of their parent or overridden subprogram (also specified in
3951 -- AI-117), which will have occurred earlier (in Derive_Subprogram
3952 -- and New_Overloaded_Entity). Here we set the convention of
3953 -- primitives that are still convention Ada, which will ensure
3954 -- that any new primitives inherit the type's convention. Class-
3955 -- wide types can have a foreign convention inherited from their
3956 -- specific type, but are excluded from this since they don't have
3957 -- any associated primitives.
3959 if Is_Tagged_Type (E)
3960 and then not Is_Class_Wide_Type (E)
3961 and then Convention (E) /= Convention_Ada
3964 Prim_List : constant Elist_Id := Primitive_Operations (E);
3968 Prim := First_Elmt (Prim_List);
3969 while Present (Prim) loop
3970 if Convention (Node (Prim)) = Convention_Ada then
3971 Set_Convention (Node (Prim), Convention (E));
3980 -- Now that all types from which E may depend are frozen, see if the
3981 -- size is known at compile time, if it must be unsigned, or if
3982 -- strict alignment is required
3984 Check_Compile_Time_Size (E);
3985 Check_Unsigned_Type (E);
3987 if Base_Type (E) = E then
3988 Check_Strict_Alignment (E);
3991 -- Do not allow a size clause for a type which does not have a size
3992 -- that is known at compile time
3994 if Has_Size_Clause (E)
3995 and then not Size_Known_At_Compile_Time (E)
3997 -- Suppress this message if errors posted on E, even if we are
3998 -- in all errors mode, since this is often a junk message
4000 if not Error_Posted (E) then
4002 ("size clause not allowed for variable length type",
4007 -- Now we set/verify the representation information, in particular
4008 -- the size and alignment values. This processing is not required for
4009 -- generic types, since generic types do not play any part in code
4010 -- generation, and so the size and alignment values for such types
4013 if Is_Generic_Type (E) then
4016 -- Otherwise we call the layout procedure
4022 -- If the type has a Defaut_Value/Default_Component_Value aspect,
4023 -- this is where we analye the expression (after the type is frozen,
4024 -- since in the case of Default_Value, we are analyzing with the
4025 -- type itself, and we treat Default_Component_Value similarly for
4026 -- the sake of uniformity.
4028 if Is_First_Subtype (E) and then Has_Default_Aspect (E) then
4036 if Is_Scalar_Type (E) then
4037 Nam := Name_Default_Value;
4040 Nam := Name_Default_Component_Value;
4041 Typ := Component_Type (E);
4044 Aspect := Get_Rep_Item_For_Entity (E, Nam);
4045 Exp := Expression (Aspect);
4046 Analyze_And_Resolve (Exp, Typ);
4048 if Etype (Exp) /= Any_Type then
4049 if not Is_Static_Expression (Exp) then
4050 Error_Msg_Name_1 := Nam;
4051 Flag_Non_Static_Expr
4052 ("aspect% requires static expression", Exp);
4058 -- End of freeze processing for type entities
4061 -- Here is where we logically freeze the current entity. If it has a
4062 -- freeze node, then this is the point at which the freeze node is
4063 -- linked into the result list.
4065 if Has_Delayed_Freeze (E) then
4067 -- If a freeze node is already allocated, use it, otherwise allocate
4068 -- a new one. The preallocation happens in the case of anonymous base
4069 -- types, where we preallocate so that we can set First_Subtype_Link.
4070 -- Note that we reset the Sloc to the current freeze location.
4072 if Present (Freeze_Node (E)) then
4073 F_Node := Freeze_Node (E);
4074 Set_Sloc (F_Node, Loc);
4077 F_Node := New_Node (N_Freeze_Entity, Loc);
4078 Set_Freeze_Node (E, F_Node);
4079 Set_Access_Types_To_Process (F_Node, No_Elist);
4080 Set_TSS_Elist (F_Node, No_Elist);
4081 Set_Actions (F_Node, No_List);
4084 Set_Entity (F_Node, E);
4085 Add_To_Result (F_Node);
4087 -- A final pass over record types with discriminants. If the type
4088 -- has an incomplete declaration, there may be constrained access
4089 -- subtypes declared elsewhere, which do not depend on the discrimi-
4090 -- nants of the type, and which are used as component types (i.e.
4091 -- the full view is a recursive type). The designated types of these
4092 -- subtypes can only be elaborated after the type itself, and they
4093 -- need an itype reference.
4095 if Ekind (E) = E_Record_Type
4096 and then Has_Discriminants (E)
4104 Comp := First_Component (E);
4105 while Present (Comp) loop
4106 Typ := Etype (Comp);
4108 if Ekind (Comp) = E_Component
4109 and then Is_Access_Type (Typ)
4110 and then Scope (Typ) /= E
4111 and then Base_Type (Designated_Type (Typ)) = E
4112 and then Is_Itype (Designated_Type (Typ))
4114 IR := Make_Itype_Reference (Sloc (Comp));
4115 Set_Itype (IR, Designated_Type (Typ));
4116 Append (IR, Result);
4119 Next_Component (Comp);
4125 -- When a type is frozen, the first subtype of the type is frozen as
4126 -- well (RM 13.14(15)). This has to be done after freezing the type,
4127 -- since obviously the first subtype depends on its own base type.
4130 Freeze_And_Append (First_Subtype (E), N, Result);
4132 -- If we just froze a tagged non-class wide record, then freeze the
4133 -- corresponding class-wide type. This must be done after the tagged
4134 -- type itself is frozen, because the class-wide type refers to the
4135 -- tagged type which generates the class.
4137 if Is_Tagged_Type (E)
4138 and then not Is_Class_Wide_Type (E)
4139 and then Present (Class_Wide_Type (E))
4141 Freeze_And_Append (Class_Wide_Type (E), N, Result);
4145 Check_Debug_Info_Needed (E);
4147 -- Special handling for subprograms
4149 if Is_Subprogram (E) then
4151 -- If subprogram has address clause then reset Is_Public flag, since
4152 -- we do not want the backend to generate external references.
4154 if Present (Address_Clause (E))
4155 and then not Is_Library_Level_Entity (E)
4157 Set_Is_Public (E, False);
4159 -- If no address clause and not intrinsic, then for imported
4160 -- subprogram in main unit, generate descriptor if we are in
4161 -- Propagate_Exceptions mode.
4163 -- This is very odd code, it makes a null result, why ???
4165 elsif Propagate_Exceptions
4166 and then Is_Imported (E)
4167 and then not Is_Intrinsic_Subprogram (E)
4168 and then Convention (E) /= Convention_Stubbed
4170 if Result = No_List then
4171 Result := Empty_List;
4179 -----------------------------
4180 -- Freeze_Enumeration_Type --
4181 -----------------------------
4183 procedure Freeze_Enumeration_Type (Typ : Entity_Id) is
4185 -- By default, if no size clause is present, an enumeration type with
4186 -- Convention C is assumed to interface to a C enum, and has integer
4187 -- size. This applies to types. For subtypes, verify that its base
4188 -- type has no size clause either.
4190 if Has_Foreign_Convention (Typ)
4191 and then not Has_Size_Clause (Typ)
4192 and then not Has_Size_Clause (Base_Type (Typ))
4193 and then Esize (Typ) < Standard_Integer_Size
4195 Init_Esize (Typ, Standard_Integer_Size);
4198 -- If the enumeration type interfaces to C, and it has a size clause
4199 -- that specifies less than int size, it warrants a warning. The
4200 -- user may intend the C type to be an enum or a char, so this is
4201 -- not by itself an error that the Ada compiler can detect, but it
4202 -- it is a worth a heads-up. For Boolean and Character types we
4203 -- assume that the programmer has the proper C type in mind.
4205 if Convention (Typ) = Convention_C
4206 and then Has_Size_Clause (Typ)
4207 and then Esize (Typ) /= Esize (Standard_Integer)
4208 and then not Is_Boolean_Type (Typ)
4209 and then not Is_Character_Type (Typ)
4212 ("C enum types have the size of a C int?", Size_Clause (Typ));
4215 Adjust_Esize_For_Alignment (Typ);
4217 end Freeze_Enumeration_Type;
4219 -----------------------
4220 -- Freeze_Expression --
4221 -----------------------
4223 procedure Freeze_Expression (N : Node_Id) is
4224 In_Spec_Exp : constant Boolean := In_Spec_Expression;
4227 Desig_Typ : Entity_Id;
4231 Freeze_Outside : Boolean := False;
4232 -- This flag is set true if the entity must be frozen outside the
4233 -- current subprogram. This happens in the case of expander generated
4234 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
4235 -- not freeze all entities like other bodies, but which nevertheless
4236 -- may reference entities that have to be frozen before the body and
4237 -- obviously cannot be frozen inside the body.
4239 function In_Exp_Body (N : Node_Id) return Boolean;
4240 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
4241 -- it is the handled statement sequence of an expander-generated
4242 -- subprogram (init proc, stream subprogram, or renaming as body).
4243 -- If so, this is not a freezing context.
4249 function In_Exp_Body (N : Node_Id) return Boolean is
4254 if Nkind (N) = N_Subprogram_Body then
4260 if Nkind (P) /= N_Subprogram_Body then
4264 Id := Defining_Unit_Name (Specification (P));
4266 if Nkind (Id) = N_Defining_Identifier
4267 and then (Is_Init_Proc (Id) or else
4268 Is_TSS (Id, TSS_Stream_Input) or else
4269 Is_TSS (Id, TSS_Stream_Output) or else
4270 Is_TSS (Id, TSS_Stream_Read) or else
4271 Is_TSS (Id, TSS_Stream_Write) or else
4272 Nkind (Original_Node (P)) =
4273 N_Subprogram_Renaming_Declaration)
4282 -- Start of processing for Freeze_Expression
4285 -- Immediate return if freezing is inhibited. This flag is set by the
4286 -- analyzer to stop freezing on generated expressions that would cause
4287 -- freezing if they were in the source program, but which are not
4288 -- supposed to freeze, since they are created.
4290 if Must_Not_Freeze (N) then
4294 -- If expression is non-static, then it does not freeze in a default
4295 -- expression, see section "Handling of Default Expressions" in the
4296 -- spec of package Sem for further details. Note that we have to
4297 -- make sure that we actually have a real expression (if we have
4298 -- a subtype indication, we can't test Is_Static_Expression!)
4301 and then Nkind (N) in N_Subexpr
4302 and then not Is_Static_Expression (N)
4307 -- Freeze type of expression if not frozen already
4311 if Nkind (N) in N_Has_Etype then
4312 if not Is_Frozen (Etype (N)) then
4315 -- Base type may be an derived numeric type that is frozen at
4316 -- the point of declaration, but first_subtype is still unfrozen.
4318 elsif not Is_Frozen (First_Subtype (Etype (N))) then
4319 Typ := First_Subtype (Etype (N));
4323 -- For entity name, freeze entity if not frozen already. A special
4324 -- exception occurs for an identifier that did not come from source.
4325 -- We don't let such identifiers freeze a non-internal entity, i.e.
4326 -- an entity that did come from source, since such an identifier was
4327 -- generated by the expander, and cannot have any semantic effect on
4328 -- the freezing semantics. For example, this stops the parameter of
4329 -- an initialization procedure from freezing the variable.
4331 if Is_Entity_Name (N)
4332 and then not Is_Frozen (Entity (N))
4333 and then (Nkind (N) /= N_Identifier
4334 or else Comes_From_Source (N)
4335 or else not Comes_From_Source (Entity (N)))
4342 -- For an allocator freeze designated type if not frozen already
4344 -- For an aggregate whose component type is an access type, freeze the
4345 -- designated type now, so that its freeze does not appear within the
4346 -- loop that might be created in the expansion of the aggregate. If the
4347 -- designated type is a private type without full view, the expression
4348 -- cannot contain an allocator, so the type is not frozen.
4350 -- For a function, we freeze the entity when the subprogram declaration
4351 -- is frozen, but a function call may appear in an initialization proc.
4352 -- before the declaration is frozen. We need to generate the extra
4353 -- formals, if any, to ensure that the expansion of the call includes
4354 -- the proper actuals. This only applies to Ada subprograms, not to
4361 Desig_Typ := Designated_Type (Etype (N));
4364 if Is_Array_Type (Etype (N))
4365 and then Is_Access_Type (Component_Type (Etype (N)))
4367 Desig_Typ := Designated_Type (Component_Type (Etype (N)));
4370 when N_Selected_Component |
4371 N_Indexed_Component |
4374 if Is_Access_Type (Etype (Prefix (N))) then
4375 Desig_Typ := Designated_Type (Etype (Prefix (N)));
4378 when N_Identifier =>
4380 and then Ekind (Nam) = E_Function
4381 and then Nkind (Parent (N)) = N_Function_Call
4382 and then Convention (Nam) = Convention_Ada
4384 Create_Extra_Formals (Nam);
4391 if Desig_Typ /= Empty
4392 and then (Is_Frozen (Desig_Typ)
4393 or else (not Is_Fully_Defined (Desig_Typ)))
4398 -- All done if nothing needs freezing
4402 and then No (Desig_Typ)
4407 -- Loop for looking at the right place to insert the freeze nodes,
4408 -- exiting from the loop when it is appropriate to insert the freeze
4409 -- node before the current node P.
4411 -- Also checks some special exceptions to the freezing rules. These
4412 -- cases result in a direct return, bypassing the freeze action.
4416 Parent_P := Parent (P);
4418 -- If we don't have a parent, then we are not in a well-formed tree.
4419 -- This is an unusual case, but there are some legitimate situations
4420 -- in which this occurs, notably when the expressions in the range of
4421 -- a type declaration are resolved. We simply ignore the freeze
4422 -- request in this case. Is this right ???
4424 if No (Parent_P) then
4428 -- See if we have got to an appropriate point in the tree
4430 case Nkind (Parent_P) is
4432 -- A special test for the exception of (RM 13.14(8)) for the case
4433 -- of per-object expressions (RM 3.8(18)) occurring in component
4434 -- definition or a discrete subtype definition. Note that we test
4435 -- for a component declaration which includes both cases we are
4436 -- interested in, and furthermore the tree does not have explicit
4437 -- nodes for either of these two constructs.
4439 when N_Component_Declaration =>
4441 -- The case we want to test for here is an identifier that is
4442 -- a per-object expression, this is either a discriminant that
4443 -- appears in a context other than the component declaration
4444 -- or it is a reference to the type of the enclosing construct.
4446 -- For either of these cases, we skip the freezing
4448 if not In_Spec_Expression
4449 and then Nkind (N) = N_Identifier
4450 and then (Present (Entity (N)))
4452 -- We recognize the discriminant case by just looking for
4453 -- a reference to a discriminant. It can only be one for
4454 -- the enclosing construct. Skip freezing in this case.
4456 if Ekind (Entity (N)) = E_Discriminant then
4459 -- For the case of a reference to the enclosing record,
4460 -- (or task or protected type), we look for a type that
4461 -- matches the current scope.
4463 elsif Entity (N) = Current_Scope then
4468 -- If we have an enumeration literal that appears as the choice in
4469 -- the aggregate of an enumeration representation clause, then
4470 -- freezing does not occur (RM 13.14(10)).
4472 when N_Enumeration_Representation_Clause =>
4474 -- The case we are looking for is an enumeration literal
4476 if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal)
4477 and then Is_Enumeration_Type (Etype (N))
4479 -- If enumeration literal appears directly as the choice,
4480 -- do not freeze (this is the normal non-overloaded case)
4482 if Nkind (Parent (N)) = N_Component_Association
4483 and then First (Choices (Parent (N))) = N
4487 -- If enumeration literal appears as the name of function
4488 -- which is the choice, then also do not freeze. This
4489 -- happens in the overloaded literal case, where the
4490 -- enumeration literal is temporarily changed to a function
4491 -- call for overloading analysis purposes.
4493 elsif Nkind (Parent (N)) = N_Function_Call
4495 Nkind (Parent (Parent (N))) = N_Component_Association
4497 First (Choices (Parent (Parent (N)))) = Parent (N)
4503 -- Normally if the parent is a handled sequence of statements,
4504 -- then the current node must be a statement, and that is an
4505 -- appropriate place to insert a freeze node.
4507 when N_Handled_Sequence_Of_Statements =>
4509 -- An exception occurs when the sequence of statements is for
4510 -- an expander generated body that did not do the usual freeze
4511 -- all operation. In this case we usually want to freeze
4512 -- outside this body, not inside it, and we skip past the
4513 -- subprogram body that we are inside.
4515 if In_Exp_Body (Parent_P) then
4517 -- However, we *do* want to freeze at this point if we have
4518 -- an entity to freeze, and that entity is declared *inside*
4519 -- the body of the expander generated procedure. This case
4520 -- is recognized by the scope of the type, which is either
4521 -- the spec for some enclosing body, or (in the case of
4522 -- init_procs, for which there are no separate specs) the
4526 Subp : constant Node_Id := Parent (Parent_P);
4530 if Nkind (Subp) = N_Subprogram_Body then
4531 Cspc := Corresponding_Spec (Subp);
4533 if (Present (Typ) and then Scope (Typ) = Cspc)
4535 (Present (Nam) and then Scope (Nam) = Cspc)
4540 and then Scope (Typ) = Current_Scope
4541 and then Current_Scope = Defining_Entity (Subp)
4548 -- If not that exception to the exception, then this is
4549 -- where we delay the freeze till outside the body.
4551 Parent_P := Parent (Parent_P);
4552 Freeze_Outside := True;
4554 -- Here if normal case where we are in handled statement
4555 -- sequence and want to do the insertion right there.
4561 -- If parent is a body or a spec or a block, then the current node
4562 -- is a statement or declaration and we can insert the freeze node
4565 when N_Block_Statement |
4568 N_Package_Specification |
4571 N_Task_Body => exit;
4573 -- The expander is allowed to define types in any statements list,
4574 -- so any of the following parent nodes also mark a freezing point
4575 -- if the actual node is in a list of statements or declarations.
4577 when N_Abortable_Part |
4578 N_Accept_Alternative |
4580 N_Case_Statement_Alternative |
4581 N_Compilation_Unit_Aux |
4582 N_Conditional_Entry_Call |
4583 N_Delay_Alternative |
4585 N_Entry_Call_Alternative |
4586 N_Exception_Handler |
4587 N_Extended_Return_Statement |
4591 N_Selective_Accept |
4592 N_Triggering_Alternative =>
4594 exit when Is_List_Member (P);
4596 -- Note: The N_Loop_Statement is a special case. A type that
4597 -- appears in the source can never be frozen in a loop (this
4598 -- occurs only because of a loop expanded by the expander), so we
4599 -- keep on going. Otherwise we terminate the search. Same is true
4600 -- of any entity which comes from source. (if they have predefined
4601 -- type, that type does not appear to come from source, but the
4602 -- entity should not be frozen here).
4604 when N_Loop_Statement =>
4605 exit when not Comes_From_Source (Etype (N))
4606 and then (No (Nam) or else not Comes_From_Source (Nam));
4608 -- For all other cases, keep looking at parents
4614 -- We fall through the case if we did not yet find the proper
4615 -- place in the free for inserting the freeze node, so climb!
4620 -- If the expression appears in a record or an initialization procedure,
4621 -- the freeze nodes are collected and attached to the current scope, to
4622 -- be inserted and analyzed on exit from the scope, to insure that
4623 -- generated entities appear in the correct scope. If the expression is
4624 -- a default for a discriminant specification, the scope is still void.
4625 -- The expression can also appear in the discriminant part of a private
4626 -- or concurrent type.
4628 -- If the expression appears in a constrained subcomponent of an
4629 -- enclosing record declaration, the freeze nodes must be attached to
4630 -- the outer record type so they can eventually be placed in the
4631 -- enclosing declaration list.
4633 -- The other case requiring this special handling is if we are in a
4634 -- default expression, since in that case we are about to freeze a
4635 -- static type, and the freeze scope needs to be the outer scope, not
4636 -- the scope of the subprogram with the default parameter.
4638 -- For default expressions and other spec expressions in generic units,
4639 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
4640 -- placing them at the proper place, after the generic unit.
4642 if (In_Spec_Exp and not Inside_A_Generic)
4643 or else Freeze_Outside
4644 or else (Is_Type (Current_Scope)
4645 and then (not Is_Concurrent_Type (Current_Scope)
4646 or else not Has_Completion (Current_Scope)))
4647 or else Ekind (Current_Scope) = E_Void
4650 N : constant Node_Id := Current_Scope;
4651 Freeze_Nodes : List_Id := No_List;
4652 Pos : Int := Scope_Stack.Last;
4655 if Present (Desig_Typ) then
4656 Freeze_And_Append (Desig_Typ, N, Freeze_Nodes);
4659 if Present (Typ) then
4660 Freeze_And_Append (Typ, N, Freeze_Nodes);
4663 if Present (Nam) then
4664 Freeze_And_Append (Nam, N, Freeze_Nodes);
4667 -- The current scope may be that of a constrained component of
4668 -- an enclosing record declaration, which is above the current
4669 -- scope in the scope stack.
4670 -- If the expression is within a top-level pragma, as for a pre-
4671 -- condition on a library-level subprogram, nothing to do.
4673 if not Is_Compilation_Unit (Current_Scope)
4674 and then Is_Record_Type (Scope (Current_Scope))
4679 if Is_Non_Empty_List (Freeze_Nodes) then
4680 if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then
4681 Scope_Stack.Table (Pos).Pending_Freeze_Actions :=
4684 Append_List (Freeze_Nodes,
4685 Scope_Stack.Table (Pos).Pending_Freeze_Actions);
4693 -- Now we have the right place to do the freezing. First, a special
4694 -- adjustment, if we are in spec-expression analysis mode, these freeze
4695 -- actions must not be thrown away (normally all inserted actions are
4696 -- thrown away in this mode. However, the freeze actions are from static
4697 -- expressions and one of the important reasons we are doing this
4698 -- special analysis is to get these freeze actions. Therefore we turn
4699 -- off the In_Spec_Expression mode to propagate these freeze actions.
4700 -- This also means they get properly analyzed and expanded.
4702 In_Spec_Expression := False;
4704 -- Freeze the designated type of an allocator (RM 13.14(13))
4706 if Present (Desig_Typ) then
4707 Freeze_Before (P, Desig_Typ);
4710 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
4711 -- the enumeration representation clause exception in the loop above.
4713 if Present (Typ) then
4714 Freeze_Before (P, Typ);
4717 -- Freeze name if one is present (RM 13.14(11))
4719 if Present (Nam) then
4720 Freeze_Before (P, Nam);
4723 -- Restore In_Spec_Expression flag
4725 In_Spec_Expression := In_Spec_Exp;
4726 end Freeze_Expression;
4728 -----------------------------
4729 -- Freeze_Fixed_Point_Type --
4730 -----------------------------
4732 -- Certain fixed-point types and subtypes, including implicit base types
4733 -- and declared first subtypes, have not yet set up a range. This is
4734 -- because the range cannot be set until the Small and Size values are
4735 -- known, and these are not known till the type is frozen.
4737 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
4738 -- whose bounds are unanalyzed real literals. This routine will recognize
4739 -- this case, and transform this range node into a properly typed range
4740 -- with properly analyzed and resolved values.
4742 procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is
4743 Rng : constant Node_Id := Scalar_Range (Typ);
4744 Lo : constant Node_Id := Low_Bound (Rng);
4745 Hi : constant Node_Id := High_Bound (Rng);
4746 Btyp : constant Entity_Id := Base_Type (Typ);
4747 Brng : constant Node_Id := Scalar_Range (Btyp);
4748 BLo : constant Node_Id := Low_Bound (Brng);
4749 BHi : constant Node_Id := High_Bound (Brng);
4750 Small : constant Ureal := Small_Value (Typ);
4757 function Fsize (Lov, Hiv : Ureal) return Nat;
4758 -- Returns size of type with given bounds. Also leaves these
4759 -- bounds set as the current bounds of the Typ.
4765 function Fsize (Lov, Hiv : Ureal) return Nat is
4767 Set_Realval (Lo, Lov);
4768 Set_Realval (Hi, Hiv);
4769 return Minimum_Size (Typ);
4772 -- Start of processing for Freeze_Fixed_Point_Type
4775 -- If Esize of a subtype has not previously been set, set it now
4777 if Unknown_Esize (Typ) then
4778 Atype := Ancestor_Subtype (Typ);
4780 if Present (Atype) then
4781 Set_Esize (Typ, Esize (Atype));
4783 Set_Esize (Typ, Esize (Base_Type (Typ)));
4787 -- Immediate return if the range is already analyzed. This means that
4788 -- the range is already set, and does not need to be computed by this
4791 if Analyzed (Rng) then
4795 -- Immediate return if either of the bounds raises Constraint_Error
4797 if Raises_Constraint_Error (Lo)
4798 or else Raises_Constraint_Error (Hi)
4803 Loval := Realval (Lo);
4804 Hival := Realval (Hi);
4806 -- Ordinary fixed-point case
4808 if Is_Ordinary_Fixed_Point_Type (Typ) then
4810 -- For the ordinary fixed-point case, we are allowed to fudge the
4811 -- end-points up or down by small. Generally we prefer to fudge up,
4812 -- i.e. widen the bounds for non-model numbers so that the end points
4813 -- are included. However there are cases in which this cannot be
4814 -- done, and indeed cases in which we may need to narrow the bounds.
4815 -- The following circuit makes the decision.
4817 -- Note: our terminology here is that Incl_EP means that the bounds
4818 -- are widened by Small if necessary to include the end points, and
4819 -- Excl_EP means that the bounds are narrowed by Small to exclude the
4820 -- end-points if this reduces the size.
4822 -- Note that in the Incl case, all we care about is including the
4823 -- end-points. In the Excl case, we want to narrow the bounds as
4824 -- much as permitted by the RM, to give the smallest possible size.
4827 Loval_Incl_EP : Ureal;
4828 Hival_Incl_EP : Ureal;
4830 Loval_Excl_EP : Ureal;
4831 Hival_Excl_EP : Ureal;
4837 First_Subt : Entity_Id;
4842 -- First step. Base types are required to be symmetrical. Right
4843 -- now, the base type range is a copy of the first subtype range.
4844 -- This will be corrected before we are done, but right away we
4845 -- need to deal with the case where both bounds are non-negative.
4846 -- In this case, we set the low bound to the negative of the high
4847 -- bound, to make sure that the size is computed to include the
4848 -- required sign. Note that we do not need to worry about the
4849 -- case of both bounds negative, because the sign will be dealt
4850 -- with anyway. Furthermore we can't just go making such a bound
4851 -- symmetrical, since in a twos-complement system, there is an
4852 -- extra negative value which could not be accommodated on the
4856 and then not UR_Is_Negative (Loval)
4857 and then Hival > Loval
4860 Set_Realval (Lo, Loval);
4863 -- Compute the fudged bounds. If the number is a model number,
4864 -- then we do nothing to include it, but we are allowed to backoff
4865 -- to the next adjacent model number when we exclude it. If it is
4866 -- not a model number then we straddle the two values with the
4867 -- model numbers on either side.
4869 Model_Num := UR_Trunc (Loval / Small) * Small;
4871 if Loval = Model_Num then
4872 Loval_Incl_EP := Model_Num;
4874 Loval_Incl_EP := Model_Num - Small;
4877 -- The low value excluding the end point is Small greater, but
4878 -- we do not do this exclusion if the low value is positive,
4879 -- since it can't help the size and could actually hurt by
4880 -- crossing the high bound.
4882 if UR_Is_Negative (Loval_Incl_EP) then
4883 Loval_Excl_EP := Loval_Incl_EP + Small;
4885 -- If the value went from negative to zero, then we have the
4886 -- case where Loval_Incl_EP is the model number just below
4887 -- zero, so we want to stick to the negative value for the
4888 -- base type to maintain the condition that the size will
4889 -- include signed values.
4892 and then UR_Is_Zero (Loval_Excl_EP)
4894 Loval_Excl_EP := Loval_Incl_EP;
4898 Loval_Excl_EP := Loval_Incl_EP;
4901 -- Similar processing for upper bound and high value
4903 Model_Num := UR_Trunc (Hival / Small) * Small;
4905 if Hival = Model_Num then
4906 Hival_Incl_EP := Model_Num;
4908 Hival_Incl_EP := Model_Num + Small;
4911 if UR_Is_Positive (Hival_Incl_EP) then
4912 Hival_Excl_EP := Hival_Incl_EP - Small;
4914 Hival_Excl_EP := Hival_Incl_EP;
4917 -- One further adjustment is needed. In the case of subtypes, we
4918 -- cannot go outside the range of the base type, or we get
4919 -- peculiarities, and the base type range is already set. This
4920 -- only applies to the Incl values, since clearly the Excl values
4921 -- are already as restricted as they are allowed to be.
4924 Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo));
4925 Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi));
4928 -- Get size including and excluding end points
4930 Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP);
4931 Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP);
4933 -- No need to exclude end-points if it does not reduce size
4935 if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then
4936 Loval_Excl_EP := Loval_Incl_EP;
4939 if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then
4940 Hival_Excl_EP := Hival_Incl_EP;
4943 -- Now we set the actual size to be used. We want to use the
4944 -- bounds fudged up to include the end-points but only if this
4945 -- can be done without violating a specifically given size
4946 -- size clause or causing an unacceptable increase in size.
4948 -- Case of size clause given
4950 if Has_Size_Clause (Typ) then
4952 -- Use the inclusive size only if it is consistent with
4953 -- the explicitly specified size.
4955 if Size_Incl_EP <= RM_Size (Typ) then
4956 Actual_Lo := Loval_Incl_EP;
4957 Actual_Hi := Hival_Incl_EP;
4958 Actual_Size := Size_Incl_EP;
4960 -- If the inclusive size is too large, we try excluding
4961 -- the end-points (will be caught later if does not work).
4964 Actual_Lo := Loval_Excl_EP;
4965 Actual_Hi := Hival_Excl_EP;
4966 Actual_Size := Size_Excl_EP;
4969 -- Case of size clause not given
4972 -- If we have a base type whose corresponding first subtype
4973 -- has an explicit size that is large enough to include our
4974 -- end-points, then do so. There is no point in working hard
4975 -- to get a base type whose size is smaller than the specified
4976 -- size of the first subtype.
4978 First_Subt := First_Subtype (Typ);
4980 if Has_Size_Clause (First_Subt)
4981 and then Size_Incl_EP <= Esize (First_Subt)
4983 Actual_Size := Size_Incl_EP;
4984 Actual_Lo := Loval_Incl_EP;
4985 Actual_Hi := Hival_Incl_EP;
4987 -- If excluding the end-points makes the size smaller and
4988 -- results in a size of 8,16,32,64, then we take the smaller
4989 -- size. For the 64 case, this is compulsory. For the other
4990 -- cases, it seems reasonable. We like to include end points
4991 -- if we can, but not at the expense of moving to the next
4992 -- natural boundary of size.
4994 elsif Size_Incl_EP /= Size_Excl_EP
4995 and then Addressable (Size_Excl_EP)
4997 Actual_Size := Size_Excl_EP;
4998 Actual_Lo := Loval_Excl_EP;
4999 Actual_Hi := Hival_Excl_EP;
5001 -- Otherwise we can definitely include the end points
5004 Actual_Size := Size_Incl_EP;
5005 Actual_Lo := Loval_Incl_EP;
5006 Actual_Hi := Hival_Incl_EP;
5009 -- One pathological case: normally we never fudge a low bound
5010 -- down, since it would seem to increase the size (if it has
5011 -- any effect), but for ranges containing single value, or no
5012 -- values, the high bound can be small too large. Consider:
5014 -- type t is delta 2.0**(-14)
5015 -- range 131072.0 .. 0;
5017 -- That lower bound is *just* outside the range of 32 bits, and
5018 -- does need fudging down in this case. Note that the bounds
5019 -- will always have crossed here, since the high bound will be
5020 -- fudged down if necessary, as in the case of:
5022 -- type t is delta 2.0**(-14)
5023 -- range 131072.0 .. 131072.0;
5025 -- So we detect the situation by looking for crossed bounds,
5026 -- and if the bounds are crossed, and the low bound is greater
5027 -- than zero, we will always back it off by small, since this
5028 -- is completely harmless.
5030 if Actual_Lo > Actual_Hi then
5031 if UR_Is_Positive (Actual_Lo) then
5032 Actual_Lo := Loval_Incl_EP - Small;
5033 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5035 -- And of course, we need to do exactly the same parallel
5036 -- fudge for flat ranges in the negative region.
5038 elsif UR_Is_Negative (Actual_Hi) then
5039 Actual_Hi := Hival_Incl_EP + Small;
5040 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5045 Set_Realval (Lo, Actual_Lo);
5046 Set_Realval (Hi, Actual_Hi);
5049 -- For the decimal case, none of this fudging is required, since there
5050 -- are no end-point problems in the decimal case (the end-points are
5051 -- always included).
5054 Actual_Size := Fsize (Loval, Hival);
5057 -- At this stage, the actual size has been calculated and the proper
5058 -- required bounds are stored in the low and high bounds.
5060 if Actual_Size > 64 then
5061 Error_Msg_Uint_1 := UI_From_Int (Actual_Size);
5063 ("size required (^) for type& too large, maximum allowed is 64",
5068 -- Check size against explicit given size
5070 if Has_Size_Clause (Typ) then
5071 if Actual_Size > RM_Size (Typ) then
5072 Error_Msg_Uint_1 := RM_Size (Typ);
5073 Error_Msg_Uint_2 := UI_From_Int (Actual_Size);
5075 ("size given (^) for type& too small, minimum allowed is ^",
5076 Size_Clause (Typ), Typ);
5079 Actual_Size := UI_To_Int (Esize (Typ));
5082 -- Increase size to next natural boundary if no size clause given
5085 if Actual_Size <= 8 then
5087 elsif Actual_Size <= 16 then
5089 elsif Actual_Size <= 32 then
5095 Init_Esize (Typ, Actual_Size);
5096 Adjust_Esize_For_Alignment (Typ);
5099 -- If we have a base type, then expand the bounds so that they extend to
5100 -- the full width of the allocated size in bits, to avoid junk range
5101 -- checks on intermediate computations.
5103 if Base_Type (Typ) = Typ then
5104 Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1))));
5105 Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1)));
5108 -- Final step is to reanalyze the bounds using the proper type
5109 -- and set the Corresponding_Integer_Value fields of the literals.
5111 Set_Etype (Lo, Empty);
5112 Set_Analyzed (Lo, False);
5115 -- Resolve with universal fixed if the base type, and the base type if
5116 -- it is a subtype. Note we can't resolve the base type with itself,
5117 -- that would be a reference before definition.
5120 Resolve (Lo, Universal_Fixed);
5125 -- Set corresponding integer value for bound
5127 Set_Corresponding_Integer_Value
5128 (Lo, UR_To_Uint (Realval (Lo) / Small));
5130 -- Similar processing for high bound
5132 Set_Etype (Hi, Empty);
5133 Set_Analyzed (Hi, False);
5137 Resolve (Hi, Universal_Fixed);
5142 Set_Corresponding_Integer_Value
5143 (Hi, UR_To_Uint (Realval (Hi) / Small));
5145 -- Set type of range to correspond to bounds
5147 Set_Etype (Rng, Etype (Lo));
5149 -- Set Esize to calculated size if not set already
5151 if Unknown_Esize (Typ) then
5152 Init_Esize (Typ, Actual_Size);
5155 -- Set RM_Size if not already set. If already set, check value
5158 Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ));
5161 if RM_Size (Typ) /= Uint_0 then
5162 if RM_Size (Typ) < Minsiz then
5163 Error_Msg_Uint_1 := RM_Size (Typ);
5164 Error_Msg_Uint_2 := Minsiz;
5166 ("size given (^) for type& too small, minimum allowed is ^",
5167 Size_Clause (Typ), Typ);
5171 Set_RM_Size (Typ, Minsiz);
5174 end Freeze_Fixed_Point_Type;
5180 procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is
5184 Set_Has_Delayed_Freeze (T);
5185 L := Freeze_Entity (T, N);
5187 if Is_Non_Empty_List (L) then
5188 Insert_Actions (N, L);
5192 --------------------------
5193 -- Freeze_Static_Object --
5194 --------------------------
5196 procedure Freeze_Static_Object (E : Entity_Id) is
5198 Cannot_Be_Static : exception;
5199 -- Exception raised if the type of a static object cannot be made
5200 -- static. This happens if the type depends on non-global objects.
5202 procedure Ensure_Expression_Is_SA (N : Node_Id);
5203 -- Called to ensure that an expression used as part of a type definition
5204 -- is statically allocatable, which means that the expression type is
5205 -- statically allocatable, and the expression is either static, or a
5206 -- reference to a library level constant.
5208 procedure Ensure_Type_Is_SA (Typ : Entity_Id);
5209 -- Called to mark a type as static, checking that it is possible
5210 -- to set the type as static. If it is not possible, then the
5211 -- exception Cannot_Be_Static is raised.
5213 -----------------------------
5214 -- Ensure_Expression_Is_SA --
5215 -----------------------------
5217 procedure Ensure_Expression_Is_SA (N : Node_Id) is
5221 Ensure_Type_Is_SA (Etype (N));
5223 if Is_Static_Expression (N) then
5226 elsif Nkind (N) = N_Identifier then
5230 and then Ekind (Ent) = E_Constant
5231 and then Is_Library_Level_Entity (Ent)
5237 raise Cannot_Be_Static;
5238 end Ensure_Expression_Is_SA;
5240 -----------------------
5241 -- Ensure_Type_Is_SA --
5242 -----------------------
5244 procedure Ensure_Type_Is_SA (Typ : Entity_Id) is
5249 -- If type is library level, we are all set
5251 if Is_Library_Level_Entity (Typ) then
5255 -- We are also OK if the type already marked as statically allocated,
5256 -- which means we processed it before.
5258 if Is_Statically_Allocated (Typ) then
5262 -- Mark type as statically allocated
5264 Set_Is_Statically_Allocated (Typ);
5266 -- Check that it is safe to statically allocate this type
5268 if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then
5269 Ensure_Expression_Is_SA (Type_Low_Bound (Typ));
5270 Ensure_Expression_Is_SA (Type_High_Bound (Typ));
5272 elsif Is_Array_Type (Typ) then
5273 N := First_Index (Typ);
5274 while Present (N) loop
5275 Ensure_Type_Is_SA (Etype (N));
5279 Ensure_Type_Is_SA (Component_Type (Typ));
5281 elsif Is_Access_Type (Typ) then
5282 if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then
5286 T : constant Entity_Id := Etype (Designated_Type (Typ));
5289 if T /= Standard_Void_Type then
5290 Ensure_Type_Is_SA (T);
5293 F := First_Formal (Designated_Type (Typ));
5294 while Present (F) loop
5295 Ensure_Type_Is_SA (Etype (F));
5301 Ensure_Type_Is_SA (Designated_Type (Typ));
5304 elsif Is_Record_Type (Typ) then
5305 C := First_Entity (Typ);
5306 while Present (C) loop
5307 if Ekind (C) = E_Discriminant
5308 or else Ekind (C) = E_Component
5310 Ensure_Type_Is_SA (Etype (C));
5312 elsif Is_Type (C) then
5313 Ensure_Type_Is_SA (C);
5319 elsif Ekind (Typ) = E_Subprogram_Type then
5320 Ensure_Type_Is_SA (Etype (Typ));
5322 C := First_Formal (Typ);
5323 while Present (C) loop
5324 Ensure_Type_Is_SA (Etype (C));
5329 raise Cannot_Be_Static;
5331 end Ensure_Type_Is_SA;
5333 -- Start of processing for Freeze_Static_Object
5336 Ensure_Type_Is_SA (Etype (E));
5339 when Cannot_Be_Static =>
5341 -- If the object that cannot be static is imported or exported, then
5342 -- issue an error message saying that this object cannot be imported
5343 -- or exported. If it has an address clause it is an overlay in the
5344 -- current partition and the static requirement is not relevant.
5345 -- Do not issue any error message when ignoring rep clauses.
5347 if Ignore_Rep_Clauses then
5350 elsif Is_Imported (E) then
5351 if No (Address_Clause (E)) then
5353 ("& cannot be imported (local type is not constant)", E);
5356 -- Otherwise must be exported, something is wrong if compiler
5357 -- is marking something as statically allocated which cannot be).
5359 else pragma Assert (Is_Exported (E));
5361 ("& cannot be exported (local type is not constant)", E);
5363 end Freeze_Static_Object;
5365 -----------------------
5366 -- Freeze_Subprogram --
5367 -----------------------
5369 procedure Freeze_Subprogram (E : Entity_Id) is
5374 -- Subprogram may not have an address clause unless it is imported
5376 if Present (Address_Clause (E)) then
5377 if not Is_Imported (E) then
5379 ("address clause can only be given " &
5380 "for imported subprogram",
5381 Name (Address_Clause (E)));
5385 -- Reset the Pure indication on an imported subprogram unless an
5386 -- explicit Pure_Function pragma was present. We do this because
5387 -- otherwise it is an insidious error to call a non-pure function from
5388 -- pure unit and have calls mysteriously optimized away. What happens
5389 -- here is that the Import can bypass the normal check to ensure that
5390 -- pure units call only pure subprograms.
5393 and then Is_Pure (E)
5394 and then not Has_Pragma_Pure_Function (E)
5396 Set_Is_Pure (E, False);
5399 -- For non-foreign convention subprograms, this is where we create
5400 -- the extra formals (for accessibility level and constrained bit
5401 -- information). We delay this till the freeze point precisely so
5402 -- that we know the convention!
5404 if not Has_Foreign_Convention (E) then
5405 Create_Extra_Formals (E);
5408 -- If this is convention Ada and a Valued_Procedure, that's odd
5410 if Ekind (E) = E_Procedure
5411 and then Is_Valued_Procedure (E)
5412 and then Convention (E) = Convention_Ada
5413 and then Warn_On_Export_Import
5416 ("?Valued_Procedure has no effect for convention Ada", E);
5417 Set_Is_Valued_Procedure (E, False);
5420 -- Case of foreign convention
5425 -- For foreign conventions, warn about return of an
5426 -- unconstrained array.
5428 -- Note: we *do* allow a return by descriptor for the VMS case,
5429 -- though here there is probably more to be done ???
5431 if Ekind (E) = E_Function then
5432 Retype := Underlying_Type (Etype (E));
5434 -- If no return type, probably some other error, e.g. a
5435 -- missing full declaration, so ignore.
5440 -- If the return type is generic, we have emitted a warning
5441 -- earlier on, and there is nothing else to check here. Specific
5442 -- instantiations may lead to erroneous behavior.
5444 elsif Is_Generic_Type (Etype (E)) then
5447 -- Display warning if returning unconstrained array
5449 elsif Is_Array_Type (Retype)
5450 and then not Is_Constrained (Retype)
5452 -- Exclude cases where descriptor mechanism is set, since the
5453 -- VMS descriptor mechanisms allow such unconstrained returns.
5455 and then Mechanism (E) not in Descriptor_Codes
5457 -- Check appropriate warning is enabled (should we check for
5458 -- Warnings (Off) on specific entities here, probably so???)
5460 and then Warn_On_Export_Import
5462 -- Exclude the VM case, since return of unconstrained arrays
5463 -- is properly handled in both the JVM and .NET cases.
5465 and then VM_Target = No_VM
5468 ("?foreign convention function& should not return " &
5469 "unconstrained array", E);
5474 -- If any of the formals for an exported foreign convention
5475 -- subprogram have defaults, then emit an appropriate warning since
5476 -- this is odd (default cannot be used from non-Ada code)
5478 if Is_Exported (E) then
5479 F := First_Formal (E);
5480 while Present (F) loop
5481 if Warn_On_Export_Import
5482 and then Present (Default_Value (F))
5485 ("?parameter cannot be defaulted in non-Ada call",
5494 -- For VMS, descriptor mechanisms for parameters are allowed only for
5495 -- imported/exported subprograms. Moreover, the NCA descriptor is not
5496 -- allowed for parameters of exported subprograms.
5498 if OpenVMS_On_Target then
5499 if Is_Exported (E) then
5500 F := First_Formal (E);
5501 while Present (F) loop
5502 if Mechanism (F) = By_Descriptor_NCA then
5504 ("'N'C'A' descriptor for parameter not permitted", F);
5506 ("\can only be used for imported subprogram", F);
5512 elsif not Is_Imported (E) then
5513 F := First_Formal (E);
5514 while Present (F) loop
5515 if Mechanism (F) in Descriptor_Codes then
5517 ("descriptor mechanism for parameter not permitted", F);
5519 ("\can only be used for imported/exported subprogram", F);
5527 -- Pragma Inline_Always is disallowed for dispatching subprograms
5528 -- because the address of such subprograms is saved in the dispatch
5529 -- table to support dispatching calls, and dispatching calls cannot
5530 -- be inlined. This is consistent with the restriction against using
5531 -- 'Access or 'Address on an Inline_Always subprogram.
5533 if Is_Dispatching_Operation (E)
5534 and then Has_Pragma_Inline_Always (E)
5537 ("pragma Inline_Always not allowed for dispatching subprograms", E);
5540 -- Because of the implicit representation of inherited predefined
5541 -- operators in the front-end, the overriding status of the operation
5542 -- may be affected when a full view of a type is analyzed, and this is
5543 -- not captured by the analysis of the corresponding type declaration.
5544 -- Therefore the correctness of a not-overriding indicator must be
5545 -- rechecked when the subprogram is frozen.
5547 if Nkind (E) = N_Defining_Operator_Symbol
5548 and then not Error_Posted (Parent (E))
5550 Check_Overriding_Indicator (E, Empty, Is_Primitive (E));
5552 end Freeze_Subprogram;
5554 ----------------------
5555 -- Is_Fully_Defined --
5556 ----------------------
5558 function Is_Fully_Defined (T : Entity_Id) return Boolean is
5560 if Ekind (T) = E_Class_Wide_Type then
5561 return Is_Fully_Defined (Etype (T));
5563 elsif Is_Array_Type (T) then
5564 return Is_Fully_Defined (Component_Type (T));
5566 elsif Is_Record_Type (T)
5567 and not Is_Private_Type (T)
5569 -- Verify that the record type has no components with private types
5570 -- without completion.
5576 Comp := First_Component (T);
5577 while Present (Comp) loop
5578 if not Is_Fully_Defined (Etype (Comp)) then
5582 Next_Component (Comp);
5587 -- For the designated type of an access to subprogram, all types in
5588 -- the profile must be fully defined.
5590 elsif Ekind (T) = E_Subprogram_Type then
5595 F := First_Formal (T);
5596 while Present (F) loop
5597 if not Is_Fully_Defined (Etype (F)) then
5604 return Is_Fully_Defined (Etype (T));
5608 return not Is_Private_Type (T)
5609 or else Present (Full_View (Base_Type (T)));
5611 end Is_Fully_Defined;
5613 ---------------------------------
5614 -- Process_Default_Expressions --
5615 ---------------------------------
5617 procedure Process_Default_Expressions
5619 After : in out Node_Id)
5621 Loc : constant Source_Ptr := Sloc (E);
5628 Set_Default_Expressions_Processed (E);
5630 -- A subprogram instance and its associated anonymous subprogram share
5631 -- their signature. The default expression functions are defined in the
5632 -- wrapper packages for the anonymous subprogram, and should not be
5633 -- generated again for the instance.
5635 if Is_Generic_Instance (E)
5636 and then Present (Alias (E))
5637 and then Default_Expressions_Processed (Alias (E))
5642 Formal := First_Formal (E);
5643 while Present (Formal) loop
5644 if Present (Default_Value (Formal)) then
5646 -- We work with a copy of the default expression because we
5647 -- do not want to disturb the original, since this would mess
5648 -- up the conformance checking.
5650 Dcopy := New_Copy_Tree (Default_Value (Formal));
5652 -- The analysis of the expression may generate insert actions,
5653 -- which of course must not be executed. We wrap those actions
5654 -- in a procedure that is not called, and later on eliminated.
5655 -- The following cases have no side-effects, and are analyzed
5658 if Nkind (Dcopy) = N_Identifier
5659 or else Nkind (Dcopy) = N_Expanded_Name
5660 or else Nkind (Dcopy) = N_Integer_Literal
5661 or else (Nkind (Dcopy) = N_Real_Literal
5662 and then not Vax_Float (Etype (Dcopy)))
5663 or else Nkind (Dcopy) = N_Character_Literal
5664 or else Nkind (Dcopy) = N_String_Literal
5665 or else Known_Null (Dcopy)
5666 or else (Nkind (Dcopy) = N_Attribute_Reference
5668 Attribute_Name (Dcopy) = Name_Null_Parameter)
5671 -- If there is no default function, we must still do a full
5672 -- analyze call on the default value, to ensure that all error
5673 -- checks are performed, e.g. those associated with static
5674 -- evaluation. Note: this branch will always be taken if the
5675 -- analyzer is turned off (but we still need the error checks).
5677 -- Note: the setting of parent here is to meet the requirement
5678 -- that we can only analyze the expression while attached to
5679 -- the tree. Really the requirement is that the parent chain
5680 -- be set, we don't actually need to be in the tree.
5682 Set_Parent (Dcopy, Declaration_Node (Formal));
5685 -- Default expressions are resolved with their own type if the
5686 -- context is generic, to avoid anomalies with private types.
5688 if Ekind (Scope (E)) = E_Generic_Package then
5691 Resolve (Dcopy, Etype (Formal));
5694 -- If that resolved expression will raise constraint error,
5695 -- then flag the default value as raising constraint error.
5696 -- This allows a proper error message on the calls.
5698 if Raises_Constraint_Error (Dcopy) then
5699 Set_Raises_Constraint_Error (Default_Value (Formal));
5702 -- If the default is a parameterless call, we use the name of
5703 -- the called function directly, and there is no body to build.
5705 elsif Nkind (Dcopy) = N_Function_Call
5706 and then No (Parameter_Associations (Dcopy))
5710 -- Else construct and analyze the body of a wrapper procedure
5711 -- that contains an object declaration to hold the expression.
5712 -- Given that this is done only to complete the analysis, it
5713 -- simpler to build a procedure than a function which might
5714 -- involve secondary stack expansion.
5717 Dnam := Make_Temporary (Loc, 'D');
5720 Make_Subprogram_Body (Loc,
5722 Make_Procedure_Specification (Loc,
5723 Defining_Unit_Name => Dnam),
5725 Declarations => New_List (
5726 Make_Object_Declaration (Loc,
5727 Defining_Identifier =>
5728 Make_Temporary (Loc, 'T'),
5729 Object_Definition =>
5730 New_Occurrence_Of (Etype (Formal), Loc),
5731 Expression => New_Copy_Tree (Dcopy))),
5733 Handled_Statement_Sequence =>
5734 Make_Handled_Sequence_Of_Statements (Loc,
5735 Statements => New_List));
5737 Set_Scope (Dnam, Scope (E));
5738 Set_Assignment_OK (First (Declarations (Dbody)));
5739 Set_Is_Eliminated (Dnam);
5740 Insert_After (After, Dbody);
5746 Next_Formal (Formal);
5748 end Process_Default_Expressions;
5750 ----------------------------------------
5751 -- Set_Component_Alignment_If_Not_Set --
5752 ----------------------------------------
5754 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is
5756 -- Ignore if not base type, subtypes don't need anything
5758 if Typ /= Base_Type (Typ) then
5762 -- Do not override existing representation
5764 if Is_Packed (Typ) then
5767 elsif Has_Specified_Layout (Typ) then
5770 elsif Component_Alignment (Typ) /= Calign_Default then
5774 Set_Component_Alignment
5775 (Typ, Scope_Stack.Table
5776 (Scope_Stack.Last).Component_Alignment_Default);
5778 end Set_Component_Alignment_If_Not_Set;
5784 procedure Undelay_Type (T : Entity_Id) is
5786 Set_Has_Delayed_Freeze (T, False);
5787 Set_Freeze_Node (T, Empty);
5789 -- Since we don't want T to have a Freeze_Node, we don't want its
5790 -- Full_View or Corresponding_Record_Type to have one either.
5792 -- ??? Fundamentally, this whole handling is a kludge. What we really
5793 -- want is to be sure that for an Itype that's part of record R and is a
5794 -- subtype of type T, that it's frozen after the later of the freeze
5795 -- points of R and T. We have no way of doing that directly, so what we
5796 -- do is force most such Itypes to be frozen as part of freezing R via
5797 -- this procedure and only delay the ones that need to be delayed
5798 -- (mostly the designated types of access types that are defined as part
5801 if Is_Private_Type (T)
5802 and then Present (Full_View (T))
5803 and then Is_Itype (Full_View (T))
5804 and then Is_Record_Type (Scope (Full_View (T)))
5806 Undelay_Type (Full_View (T));
5809 if Is_Concurrent_Type (T)
5810 and then Present (Corresponding_Record_Type (T))
5811 and then Is_Itype (Corresponding_Record_Type (T))
5812 and then Is_Record_Type (Scope (Corresponding_Record_Type (T)))
5814 Undelay_Type (Corresponding_Record_Type (T));
5822 procedure Warn_Overlay
5827 Ent : constant Entity_Id := Entity (Nam);
5828 -- The object to which the address clause applies
5831 Old : Entity_Id := Empty;
5835 -- No warning if address clause overlay warnings are off
5837 if not Address_Clause_Overlay_Warnings then
5841 -- No warning if there is an explicit initialization
5843 Init := Original_Node (Expression (Declaration_Node (Ent)));
5845 if Present (Init) and then Comes_From_Source (Init) then
5849 -- We only give the warning for non-imported entities of a type for
5850 -- which a non-null base init proc is defined, or for objects of access
5851 -- types with implicit null initialization, or when Normalize_Scalars
5852 -- applies and the type is scalar or a string type (the latter being
5853 -- tested for because predefined String types are initialized by inline
5854 -- code rather than by an init_proc). Note that we do not give the
5855 -- warning for Initialize_Scalars, since we suppressed initialization
5856 -- in this case. Also, do not warn if Suppress_Initialization is set.
5859 and then not Is_Imported (Ent)
5860 and then not Initialization_Suppressed (Typ)
5861 and then (Has_Non_Null_Base_Init_Proc (Typ)
5862 or else Is_Access_Type (Typ)
5863 or else (Normalize_Scalars
5864 and then (Is_Scalar_Type (Typ)
5865 or else Is_String_Type (Typ))))
5867 if Nkind (Expr) = N_Attribute_Reference
5868 and then Is_Entity_Name (Prefix (Expr))
5870 Old := Entity (Prefix (Expr));
5872 elsif Is_Entity_Name (Expr)
5873 and then Ekind (Entity (Expr)) = E_Constant
5875 Decl := Declaration_Node (Entity (Expr));
5877 if Nkind (Decl) = N_Object_Declaration
5878 and then Present (Expression (Decl))
5879 and then Nkind (Expression (Decl)) = N_Attribute_Reference
5880 and then Is_Entity_Name (Prefix (Expression (Decl)))
5882 Old := Entity (Prefix (Expression (Decl)));
5884 elsif Nkind (Expr) = N_Function_Call then
5888 -- A function call (most likely to To_Address) is probably not an
5889 -- overlay, so skip warning. Ditto if the function call was inlined
5890 -- and transformed into an entity.
5892 elsif Nkind (Original_Node (Expr)) = N_Function_Call then
5896 Decl := Next (Parent (Expr));
5898 -- If a pragma Import follows, we assume that it is for the current
5899 -- target of the address clause, and skip the warning.
5902 and then Nkind (Decl) = N_Pragma
5903 and then Pragma_Name (Decl) = Name_Import
5908 if Present (Old) then
5909 Error_Msg_Node_2 := Old;
5911 ("default initialization of & may modify &?",
5915 ("default initialization of & may modify overlaid storage?",
5919 -- Add friendly warning if initialization comes from a packed array
5922 if Is_Record_Type (Typ) then
5927 Comp := First_Component (Typ);
5928 while Present (Comp) loop
5929 if Nkind (Parent (Comp)) = N_Component_Declaration
5930 and then Present (Expression (Parent (Comp)))
5933 elsif Is_Array_Type (Etype (Comp))
5934 and then Present (Packed_Array_Type (Etype (Comp)))
5937 ("\packed array component& " &
5938 "will be initialized to zero?",
5942 Next_Component (Comp);
5949 ("\use pragma Import for & to " &
5950 "suppress initialization (RM B.1(24))?",