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 -- Check for bad size clause given
628 elsif Has_Size_Clause (T) then
629 if RM_Size (T) < S then
630 Error_Msg_Uint_1 := S;
632 ("size for& too small, minimum allowed is ^",
636 -- Set size if not set already
638 elsif Unknown_RM_Size (T) then
647 function Size_Known (T : Entity_Id) return Boolean is
655 if Size_Known_At_Compile_Time (T) then
658 -- Always True for scalar types. This is true even for generic formal
659 -- scalar types. We used to return False in the latter case, but the
660 -- size is known at compile time, even in the template, we just do
661 -- not know the exact size but that's not the point of this routine.
663 elsif Is_Scalar_Type (T)
664 or else Is_Task_Type (T)
670 elsif Is_Array_Type (T) then
672 -- String literals always have known size, and we can set it
674 if Ekind (T) = E_String_Literal_Subtype then
675 Set_Small_Size (T, Component_Size (T)
676 * String_Literal_Length (T));
679 -- Unconstrained types never have known at compile time size
681 elsif not Is_Constrained (T) then
684 -- Don't do any recursion on type with error posted, since we may
685 -- have a malformed type that leads us into a loop.
687 elsif Error_Posted (T) then
690 -- Otherwise if component size unknown, then array size unknown
692 elsif not Size_Known (Component_Type (T)) then
696 -- Check for all indexes static, and also compute possible size
697 -- (in case it is less than 32 and may be packable).
700 Esiz : Uint := Component_Size (T);
704 Index := First_Index (T);
705 while Present (Index) loop
706 if Nkind (Index) = N_Range then
707 Get_Index_Bounds (Index, Low, High);
709 elsif Error_Posted (Scalar_Range (Etype (Index))) then
713 Low := Type_Low_Bound (Etype (Index));
714 High := Type_High_Bound (Etype (Index));
717 if not Compile_Time_Known_Value (Low)
718 or else not Compile_Time_Known_Value (High)
719 or else Etype (Index) = Any_Type
724 Dim := Expr_Value (High) - Expr_Value (Low) + 1;
736 Set_Small_Size (T, Esiz);
740 -- Access types always have known at compile time sizes
742 elsif Is_Access_Type (T) then
745 -- For non-generic private types, go to underlying type if present
747 elsif Is_Private_Type (T)
748 and then not Is_Generic_Type (T)
749 and then Present (Underlying_Type (T))
751 -- Don't do any recursion on type with error posted, since we may
752 -- have a malformed type that leads us into a loop.
754 if Error_Posted (T) then
757 return Size_Known (Underlying_Type (T));
762 elsif Is_Record_Type (T) then
764 -- A class-wide type is never considered to have a known size
766 if Is_Class_Wide_Type (T) then
769 -- A subtype of a variant record must not have non-static
770 -- discriminated components.
772 elsif T /= Base_Type (T)
773 and then not Static_Discriminated_Components (T)
777 -- Don't do any recursion on type with error posted, since we may
778 -- have a malformed type that leads us into a loop.
780 elsif Error_Posted (T) then
784 -- Now look at the components of the record
787 -- The following two variables are used to keep track of the
788 -- size of packed records if we can tell the size of the packed
789 -- record in the front end. Packed_Size_Known is True if so far
790 -- we can figure out the size. It is initialized to True for a
791 -- packed record, unless the record has discriminants. The
792 -- reason we eliminate the discriminated case is that we don't
793 -- know the way the back end lays out discriminated packed
794 -- records. If Packed_Size_Known is True, then Packed_Size is
795 -- the size in bits so far.
797 Packed_Size_Known : Boolean :=
799 and then not Has_Discriminants (T);
801 Packed_Size : Uint := Uint_0;
804 -- Test for variant part present
806 if Has_Discriminants (T)
807 and then Present (Parent (T))
808 and then Nkind (Parent (T)) = N_Full_Type_Declaration
809 and then Nkind (Type_Definition (Parent (T))) =
811 and then not Null_Present (Type_Definition (Parent (T)))
812 and then Present (Variant_Part
813 (Component_List (Type_Definition (Parent (T)))))
815 -- If variant part is present, and type is unconstrained,
816 -- then we must have defaulted discriminants, or a size
817 -- clause must be present for the type, or else the size
818 -- is definitely not known at compile time.
820 if not Is_Constrained (T)
822 No (Discriminant_Default_Value (First_Discriminant (T)))
823 and then Unknown_RM_Size (T)
829 -- Loop through components
831 Comp := First_Component_Or_Discriminant (T);
832 while Present (Comp) loop
833 Ctyp := Etype (Comp);
835 -- We do not know the packed size if there is a component
836 -- clause present (we possibly could, but this would only
837 -- help in the case of a record with partial rep clauses.
838 -- That's because in the case of full rep clauses, the
839 -- size gets figured out anyway by a different circuit).
841 if Present (Component_Clause (Comp)) then
842 Packed_Size_Known := False;
845 -- We need to identify a component that is an array where
846 -- the index type is an enumeration type with non-standard
847 -- representation, and some bound of the type depends on a
850 -- This is because gigi computes the size by doing a
851 -- substitution of the appropriate discriminant value in
852 -- the size expression for the base type, and gigi is not
853 -- clever enough to evaluate the resulting expression (which
854 -- involves a call to rep_to_pos) at compile time.
856 -- It would be nice if gigi would either recognize that
857 -- this expression can be computed at compile time, or
858 -- alternatively figured out the size from the subtype
859 -- directly, where all the information is at hand ???
861 if Is_Array_Type (Etype (Comp))
862 and then Present (Packed_Array_Type (Etype (Comp)))
865 Ocomp : constant Entity_Id :=
866 Original_Record_Component (Comp);
867 OCtyp : constant Entity_Id := Etype (Ocomp);
873 Ind := First_Index (OCtyp);
874 while Present (Ind) loop
875 Indtyp := Etype (Ind);
877 if Is_Enumeration_Type (Indtyp)
878 and then Has_Non_Standard_Rep (Indtyp)
880 Lo := Type_Low_Bound (Indtyp);
881 Hi := Type_High_Bound (Indtyp);
883 if Is_Entity_Name (Lo)
884 and then Ekind (Entity (Lo)) = E_Discriminant
888 elsif Is_Entity_Name (Hi)
889 and then Ekind (Entity (Hi)) = E_Discriminant
900 -- Clearly size of record is not known if the size of one of
901 -- the components is not known.
903 if not Size_Known (Ctyp) then
907 -- Accumulate packed size if possible
909 if Packed_Size_Known then
911 -- We can only deal with elementary types, since for
912 -- non-elementary components, alignment enters into the
913 -- picture, and we don't know enough to handle proper
914 -- alignment in this context. Packed arrays count as
915 -- elementary if the representation is a modular type.
917 if Is_Elementary_Type (Ctyp)
918 or else (Is_Array_Type (Ctyp)
919 and then Present (Packed_Array_Type (Ctyp))
920 and then Is_Modular_Integer_Type
921 (Packed_Array_Type (Ctyp)))
923 -- If RM_Size is known and static, then we can keep
924 -- accumulating the packed size.
926 if Known_Static_RM_Size (Ctyp) then
928 -- A little glitch, to be removed sometime ???
929 -- gigi does not understand zero sizes yet.
931 if RM_Size (Ctyp) = Uint_0 then
932 Packed_Size_Known := False;
934 -- Normal case where we can keep accumulating the
935 -- packed array size.
938 Packed_Size := Packed_Size + RM_Size (Ctyp);
941 -- If we have a field whose RM_Size is not known then
942 -- we can't figure out the packed size here.
945 Packed_Size_Known := False;
948 -- If we have a non-elementary type we can't figure out
949 -- the packed array size (alignment issues).
952 Packed_Size_Known := False;
956 Next_Component_Or_Discriminant (Comp);
959 if Packed_Size_Known then
960 Set_Small_Size (T, Packed_Size);
966 -- All other cases, size not known at compile time
973 -------------------------------------
974 -- Static_Discriminated_Components --
975 -------------------------------------
977 function Static_Discriminated_Components
978 (T : Entity_Id) return Boolean
980 Constraint : Elmt_Id;
983 if Has_Discriminants (T)
984 and then Present (Discriminant_Constraint (T))
985 and then Present (First_Component (T))
987 Constraint := First_Elmt (Discriminant_Constraint (T));
988 while Present (Constraint) loop
989 if not Compile_Time_Known_Value (Node (Constraint)) then
993 Next_Elmt (Constraint);
998 end Static_Discriminated_Components;
1000 -- Start of processing for Check_Compile_Time_Size
1003 Set_Size_Known_At_Compile_Time (T, Size_Known (T));
1004 end Check_Compile_Time_Size;
1006 -----------------------------
1007 -- Check_Debug_Info_Needed --
1008 -----------------------------
1010 procedure Check_Debug_Info_Needed (T : Entity_Id) is
1012 if Debug_Info_Off (T) then
1015 elsif Comes_From_Source (T)
1016 or else Debug_Generated_Code
1017 or else Debug_Flag_VV
1018 or else Needs_Debug_Info (T)
1020 Set_Debug_Info_Needed (T);
1022 end Check_Debug_Info_Needed;
1024 ----------------------------
1025 -- Check_Strict_Alignment --
1026 ----------------------------
1028 procedure Check_Strict_Alignment (E : Entity_Id) is
1032 if Is_Tagged_Type (E) or else Is_Concurrent_Type (E) then
1033 Set_Strict_Alignment (E);
1035 elsif Is_Array_Type (E) then
1036 Set_Strict_Alignment (E, Strict_Alignment (Component_Type (E)));
1038 elsif Is_Record_Type (E) then
1039 if Is_Limited_Record (E) then
1040 Set_Strict_Alignment (E);
1044 Comp := First_Component (E);
1045 while Present (Comp) loop
1046 if not Is_Type (Comp)
1047 and then (Strict_Alignment (Etype (Comp))
1048 or else Is_Aliased (Comp))
1050 Set_Strict_Alignment (E);
1054 Next_Component (Comp);
1057 end Check_Strict_Alignment;
1059 -------------------------
1060 -- Check_Unsigned_Type --
1061 -------------------------
1063 procedure Check_Unsigned_Type (E : Entity_Id) is
1064 Ancestor : Entity_Id;
1069 if not Is_Discrete_Or_Fixed_Point_Type (E) then
1073 -- Do not attempt to analyze case where range was in error
1075 if No (Scalar_Range (E))
1076 or else Error_Posted (Scalar_Range (E))
1081 -- The situation that is non trivial is something like
1083 -- subtype x1 is integer range -10 .. +10;
1084 -- subtype x2 is x1 range 0 .. V1;
1085 -- subtype x3 is x2 range V2 .. V3;
1086 -- subtype x4 is x3 range V4 .. V5;
1088 -- where Vn are variables. Here the base type is signed, but we still
1089 -- know that x4 is unsigned because of the lower bound of x2.
1091 -- The only way to deal with this is to look up the ancestor chain
1095 if Ancestor = Any_Type or else Etype (Ancestor) = Any_Type then
1099 Lo_Bound := Type_Low_Bound (Ancestor);
1101 if Compile_Time_Known_Value (Lo_Bound) then
1103 if Expr_Rep_Value (Lo_Bound) >= 0 then
1104 Set_Is_Unsigned_Type (E, True);
1110 Ancestor := Ancestor_Subtype (Ancestor);
1112 -- If no ancestor had a static lower bound, go to base type
1114 if No (Ancestor) then
1116 -- Note: the reason we still check for a compile time known
1117 -- value for the base type is that at least in the case of
1118 -- generic formals, we can have bounds that fail this test,
1119 -- and there may be other cases in error situations.
1121 Btyp := Base_Type (E);
1123 if Btyp = Any_Type or else Etype (Btyp) = Any_Type then
1127 Lo_Bound := Type_Low_Bound (Base_Type (E));
1129 if Compile_Time_Known_Value (Lo_Bound)
1130 and then Expr_Rep_Value (Lo_Bound) >= 0
1132 Set_Is_Unsigned_Type (E, True);
1139 end Check_Unsigned_Type;
1141 -------------------------
1142 -- Is_Atomic_Aggregate --
1143 -------------------------
1145 function Is_Atomic_Aggregate
1147 Typ : Entity_Id) return Boolean
1149 Loc : constant Source_Ptr := Sloc (E);
1157 -- Array may be qualified, so find outer context
1159 if Nkind (Par) = N_Qualified_Expression then
1160 Par := Parent (Par);
1163 if Nkind_In (Par, N_Object_Declaration, N_Assignment_Statement)
1164 and then Comes_From_Source (Par)
1166 Temp := Make_Temporary (Loc, 'T', E);
1168 Make_Object_Declaration (Loc,
1169 Defining_Identifier => Temp,
1170 Object_Definition => New_Occurrence_Of (Typ, Loc),
1171 Expression => Relocate_Node (E));
1172 Insert_Before (Par, New_N);
1175 Set_Expression (Par, New_Occurrence_Of (Temp, Loc));
1181 end Is_Atomic_Aggregate;
1187 -- Note: the easy coding for this procedure would be to just build a
1188 -- single list of freeze nodes and then insert them and analyze them
1189 -- all at once. This won't work, because the analysis of earlier freeze
1190 -- nodes may recursively freeze types which would otherwise appear later
1191 -- on in the freeze list. So we must analyze and expand the freeze nodes
1192 -- as they are generated.
1194 procedure Freeze_All (From : Entity_Id; After : in out Node_Id) is
1198 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id);
1199 -- This is the internal recursive routine that does freezing of entities
1200 -- (but NOT the analysis of default expressions, which should not be
1201 -- recursive, we don't want to analyze those till we are sure that ALL
1202 -- the types are frozen).
1204 --------------------
1205 -- Freeze_All_Ent --
1206 --------------------
1208 procedure Freeze_All_Ent (From : Entity_Id; After : in out Node_Id) is
1213 procedure Process_Flist;
1214 -- If freeze nodes are present, insert and analyze, and reset cursor
1215 -- for next insertion.
1221 procedure Process_Flist is
1223 if Is_Non_Empty_List (Flist) then
1224 Lastn := Next (After);
1225 Insert_List_After_And_Analyze (After, Flist);
1227 if Present (Lastn) then
1228 After := Prev (Lastn);
1230 After := Last (List_Containing (After));
1235 -- Start or processing for Freeze_All_Ent
1239 while Present (E) loop
1241 -- If the entity is an inner package which is not a package
1242 -- renaming, then its entities must be frozen at this point. Note
1243 -- that such entities do NOT get frozen at the end of the nested
1244 -- package itself (only library packages freeze).
1246 -- Same is true for task declarations, where anonymous records
1247 -- created for entry parameters must be frozen.
1249 if Ekind (E) = E_Package
1250 and then No (Renamed_Object (E))
1251 and then not Is_Child_Unit (E)
1252 and then not Is_Frozen (E)
1255 Install_Visible_Declarations (E);
1256 Install_Private_Declarations (E);
1258 Freeze_All (First_Entity (E), After);
1260 End_Package_Scope (E);
1262 if Is_Generic_Instance (E)
1263 and then Has_Delayed_Freeze (E)
1265 Set_Has_Delayed_Freeze (E, False);
1266 Expand_N_Package_Declaration (Unit_Declaration_Node (E));
1269 elsif Ekind (E) in Task_Kind
1271 (Nkind (Parent (E)) = N_Task_Type_Declaration
1273 Nkind (Parent (E)) = N_Single_Task_Declaration)
1276 Freeze_All (First_Entity (E), After);
1279 -- For a derived tagged type, we must ensure that all the
1280 -- primitive operations of the parent have been frozen, so that
1281 -- their addresses will be in the parent's dispatch table at the
1282 -- point it is inherited.
1284 elsif Ekind (E) = E_Record_Type
1285 and then Is_Tagged_Type (E)
1286 and then Is_Tagged_Type (Etype (E))
1287 and then Is_Derived_Type (E)
1290 Prim_List : constant Elist_Id :=
1291 Primitive_Operations (Etype (E));
1297 Prim := First_Elmt (Prim_List);
1298 while Present (Prim) loop
1299 Subp := Node (Prim);
1301 if Comes_From_Source (Subp)
1302 and then not Is_Frozen (Subp)
1304 Flist := Freeze_Entity (Subp, After);
1313 if not Is_Frozen (E) then
1314 Flist := Freeze_Entity (E, After);
1317 -- If already frozen, and there are delayed aspects, this is where
1318 -- we do the visibility check for these aspects (see Sem_Ch13 spec
1319 -- for a description of how we handle aspect visibility).
1321 elsif Has_Delayed_Aspects (E) then
1326 Ritem := First_Rep_Item (E);
1327 while Present (Ritem) loop
1328 if Nkind (Ritem) = N_Aspect_Specification
1329 and then Entity (Ritem) = E
1330 and then Is_Delayed_Aspect (Ritem)
1332 Check_Aspect_At_End_Of_Declarations (Ritem);
1335 Ritem := Next_Rep_Item (Ritem);
1340 -- If an incomplete type is still not frozen, this may be a
1341 -- premature freezing because of a body declaration that follows.
1342 -- Indicate where the freezing took place.
1344 -- If the freezing is caused by the end of the current declarative
1345 -- part, it is a Taft Amendment type, and there is no error.
1347 if not Is_Frozen (E)
1348 and then Ekind (E) = E_Incomplete_Type
1351 Bod : constant Node_Id := Next (After);
1354 if (Nkind_In (Bod, N_Subprogram_Body,
1359 or else Nkind (Bod) in N_Body_Stub)
1361 List_Containing (After) = List_Containing (Parent (E))
1363 Error_Msg_Sloc := Sloc (Next (After));
1365 ("type& is frozen# before its full declaration",
1375 -- Start of processing for Freeze_All
1378 Freeze_All_Ent (From, After);
1380 -- Now that all types are frozen, we can deal with default expressions
1381 -- that require us to build a default expression functions. This is the
1382 -- point at which such functions are constructed (after all types that
1383 -- might be used in such expressions have been frozen).
1385 -- For subprograms that are renaming_as_body, we create the wrapper
1386 -- bodies as needed.
1388 -- We also add finalization chains to access types whose designated
1389 -- types are controlled. This is normally done when freezing the type,
1390 -- but this misses recursive type definitions where the later members
1391 -- of the recursion introduce controlled components.
1393 -- Loop through entities
1396 while Present (E) loop
1397 if Is_Subprogram (E) then
1399 if not Default_Expressions_Processed (E) then
1400 Process_Default_Expressions (E, After);
1403 if not Has_Completion (E) then
1404 Decl := Unit_Declaration_Node (E);
1406 if Nkind (Decl) = N_Subprogram_Renaming_Declaration then
1407 Build_And_Analyze_Renamed_Body (Decl, E, After);
1409 elsif Nkind (Decl) = N_Subprogram_Declaration
1410 and then Present (Corresponding_Body (Decl))
1412 Nkind (Unit_Declaration_Node (Corresponding_Body (Decl)))
1413 = N_Subprogram_Renaming_Declaration
1415 Build_And_Analyze_Renamed_Body
1416 (Decl, Corresponding_Body (Decl), After);
1420 elsif Ekind (E) in Task_Kind
1422 (Nkind (Parent (E)) = N_Task_Type_Declaration
1424 Nkind (Parent (E)) = N_Single_Task_Declaration)
1430 Ent := First_Entity (E);
1431 while Present (Ent) loop
1433 and then not Default_Expressions_Processed (Ent)
1435 Process_Default_Expressions (Ent, After);
1442 -- We add finalization masters to access types whose designated types
1443 -- require finalization. This is normally done when freezing the
1444 -- type, but this misses recursive type definitions where the later
1445 -- members of the recursion introduce controlled components (such as
1446 -- can happen when incomplete types are involved), as well cases
1447 -- where a component type is private and the controlled full type
1448 -- occurs after the access type is frozen. Cases that don't need a
1449 -- finalization master are generic formal types (the actual type will
1450 -- have it) and types with Java and CIL conventions, since those are
1451 -- used for API bindings. (Are there any other cases that should be
1452 -- excluded here???)
1454 elsif Is_Access_Type (E)
1455 and then Comes_From_Source (E)
1456 and then not Is_Generic_Type (E)
1457 and then Needs_Finalization (Designated_Type (E))
1459 Build_Finalization_Master (E);
1466 -----------------------
1467 -- Freeze_And_Append --
1468 -----------------------
1470 procedure Freeze_And_Append
1473 Result : in out List_Id)
1475 L : constant List_Id := Freeze_Entity (Ent, N);
1477 if Is_Non_Empty_List (L) then
1478 if Result = No_List then
1481 Append_List (L, Result);
1484 end Freeze_And_Append;
1490 procedure Freeze_Before (N : Node_Id; T : Entity_Id) is
1491 Freeze_Nodes : constant List_Id := Freeze_Entity (T, N);
1493 if Is_Non_Empty_List (Freeze_Nodes) then
1494 Insert_Actions (N, Freeze_Nodes);
1502 function Freeze_Entity (E : Entity_Id; N : Node_Id) return List_Id is
1503 Loc : constant Source_Ptr := Sloc (N);
1504 Test_E : Entity_Id := E;
1511 Result : List_Id := No_List;
1512 -- List of freezing actions, left at No_List if none
1514 Has_Default_Initialization : Boolean := False;
1515 -- This flag gets set to true for a variable with default initialization
1517 procedure Add_To_Result (N : Node_Id);
1518 -- N is a freezing action to be appended to the Result
1520 procedure Check_Current_Instance (Comp_Decl : Node_Id);
1521 -- Check that an Access or Unchecked_Access attribute with a prefix
1522 -- which is the current instance type can only be applied when the type
1525 procedure Check_Suspicious_Modulus (Utype : Entity_Id);
1526 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1527 -- integer literal without an explicit corresponding size clause. The
1528 -- caller has checked that Utype is a modular integer type.
1530 function After_Last_Declaration return Boolean;
1531 -- If Loc is a freeze_entity that appears after the last declaration
1532 -- in the scope, inhibit error messages on late completion.
1534 procedure Freeze_Record_Type (Rec : Entity_Id);
1535 -- Freeze each component, handle some representation clauses, and freeze
1536 -- primitive operations if this is a tagged type.
1542 procedure Add_To_Result (N : Node_Id) is
1545 Result := New_List (N);
1551 ----------------------------
1552 -- After_Last_Declaration --
1553 ----------------------------
1555 function After_Last_Declaration return Boolean is
1556 Spec : constant Node_Id := Parent (Current_Scope);
1558 if Nkind (Spec) = N_Package_Specification then
1559 if Present (Private_Declarations (Spec)) then
1560 return Loc >= Sloc (Last (Private_Declarations (Spec)));
1561 elsif Present (Visible_Declarations (Spec)) then
1562 return Loc >= Sloc (Last (Visible_Declarations (Spec)));
1569 end After_Last_Declaration;
1571 ----------------------------
1572 -- Check_Current_Instance --
1573 ----------------------------
1575 procedure Check_Current_Instance (Comp_Decl : Node_Id) is
1577 Rec_Type : constant Entity_Id :=
1578 Scope (Defining_Identifier (Comp_Decl));
1580 Decl : constant Node_Id := Parent (Rec_Type);
1582 function Process (N : Node_Id) return Traverse_Result;
1583 -- Process routine to apply check to given node
1589 function Process (N : Node_Id) return Traverse_Result is
1592 when N_Attribute_Reference =>
1593 if (Attribute_Name (N) = Name_Access
1595 Attribute_Name (N) = Name_Unchecked_Access)
1596 and then Is_Entity_Name (Prefix (N))
1597 and then Is_Type (Entity (Prefix (N)))
1598 and then Entity (Prefix (N)) = E
1601 ("current instance must be a limited type", Prefix (N));
1607 when others => return OK;
1611 procedure Traverse is new Traverse_Proc (Process);
1613 -- Start of processing for Check_Current_Instance
1616 -- In Ada95, the (imprecise) rule is that the current instance of a
1617 -- limited type is aliased. In Ada2005, limitedness must be explicit:
1618 -- either a tagged type, or a limited record.
1620 if Is_Limited_Type (Rec_Type)
1621 and then (Ada_Version < Ada_2005 or else Is_Tagged_Type (Rec_Type))
1625 elsif Nkind (Decl) = N_Full_Type_Declaration
1626 and then Limited_Present (Type_Definition (Decl))
1631 Traverse (Comp_Decl);
1633 end Check_Current_Instance;
1635 ------------------------------
1636 -- Check_Suspicious_Modulus --
1637 ------------------------------
1639 procedure Check_Suspicious_Modulus (Utype : Entity_Id) is
1640 Decl : constant Node_Id := Declaration_Node (Underlying_Type (Utype));
1643 if Nkind (Decl) = N_Full_Type_Declaration then
1645 Tdef : constant Node_Id := Type_Definition (Decl);
1647 if Nkind (Tdef) = N_Modular_Type_Definition then
1649 Modulus : constant Node_Id :=
1650 Original_Node (Expression (Tdef));
1652 if Nkind (Modulus) = N_Integer_Literal then
1654 Modv : constant Uint := Intval (Modulus);
1655 Sizv : constant Uint := RM_Size (Utype);
1658 -- First case, modulus and size are the same. This
1659 -- happens if you have something like mod 32, with
1660 -- an explicit size of 32, this is for sure a case
1661 -- where the warning is given, since it is seems
1662 -- very unlikely that someone would want e.g. a
1663 -- five bit type stored in 32 bits. It is much
1664 -- more likely they wanted a 32-bit type.
1669 -- Second case, the modulus is 32 or 64 and no
1670 -- size clause is present. This is a less clear
1671 -- case for giving the warning, but in the case
1672 -- of 32/64 (5-bit or 6-bit types) these seem rare
1673 -- enough that it is a likely error (and in any
1674 -- case using 2**5 or 2**6 in these cases seems
1675 -- clearer. We don't include 8 or 16 here, simply
1676 -- because in practice 3-bit and 4-bit types are
1677 -- more common and too many false positives if
1678 -- we warn in these cases.
1680 elsif not Has_Size_Clause (Utype)
1681 and then (Modv = Uint_32 or else Modv = Uint_64)
1685 -- No warning needed
1691 -- If we fall through, give warning
1693 Error_Msg_Uint_1 := Modv;
1695 ("?2 '*'*^' may have been intended here",
1703 end Check_Suspicious_Modulus;
1705 ------------------------
1706 -- Freeze_Record_Type --
1707 ------------------------
1709 procedure Freeze_Record_Type (Rec : Entity_Id) is
1716 pragma Warnings (Off, Junk);
1718 Unplaced_Component : Boolean := False;
1719 -- Set True if we find at least one component with no component
1720 -- clause (used to warn about useless Pack pragmas).
1722 Placed_Component : Boolean := False;
1723 -- Set True if we find at least one component with a component
1724 -- clause (used to warn about useless Bit_Order pragmas, and also
1725 -- to detect cases where Implicit_Packing may have an effect).
1727 All_Scalar_Components : Boolean := True;
1728 -- Set False if we encounter a component of a non-scalar type
1730 Scalar_Component_Total_RM_Size : Uint := Uint_0;
1731 Scalar_Component_Total_Esize : Uint := Uint_0;
1732 -- Accumulates total RM_Size values and total Esize values of all
1733 -- scalar components. Used for processing of Implicit_Packing.
1735 function Check_Allocator (N : Node_Id) return Node_Id;
1736 -- If N is an allocator, possibly wrapped in one or more level of
1737 -- qualified expression(s), return the inner allocator node, else
1740 procedure Check_Itype (Typ : Entity_Id);
1741 -- If the component subtype is an access to a constrained subtype of
1742 -- an already frozen type, make the subtype frozen as well. It might
1743 -- otherwise be frozen in the wrong scope, and a freeze node on
1744 -- subtype has no effect. Similarly, if the component subtype is a
1745 -- regular (not protected) access to subprogram, set the anonymous
1746 -- subprogram type to frozen as well, to prevent an out-of-scope
1747 -- freeze node at some eventual point of call. Protected operations
1748 -- are handled elsewhere.
1750 ---------------------
1751 -- Check_Allocator --
1752 ---------------------
1754 function Check_Allocator (N : Node_Id) return Node_Id is
1759 if Nkind (Inner) = N_Allocator then
1761 elsif Nkind (Inner) = N_Qualified_Expression then
1762 Inner := Expression (Inner);
1767 end Check_Allocator;
1773 procedure Check_Itype (Typ : Entity_Id) is
1774 Desig : constant Entity_Id := Designated_Type (Typ);
1777 if not Is_Frozen (Desig)
1778 and then Is_Frozen (Base_Type (Desig))
1780 Set_Is_Frozen (Desig);
1782 -- In addition, add an Itype_Reference to ensure that the
1783 -- access subtype is elaborated early enough. This cannot be
1784 -- done if the subtype may depend on discriminants.
1786 if Ekind (Comp) = E_Component
1787 and then Is_Itype (Etype (Comp))
1788 and then not Has_Discriminants (Rec)
1790 IR := Make_Itype_Reference (Sloc (Comp));
1791 Set_Itype (IR, Desig);
1795 elsif Ekind (Typ) = E_Anonymous_Access_Subprogram_Type
1796 and then Convention (Desig) /= Convention_Protected
1798 Set_Is_Frozen (Desig);
1802 -- Start of processing for Freeze_Record_Type
1805 -- Freeze components and embedded subtypes
1807 Comp := First_Entity (Rec);
1809 while Present (Comp) loop
1811 -- First handle the component case
1813 if Ekind (Comp) = E_Component
1814 or else Ekind (Comp) = E_Discriminant
1817 CC : constant Node_Id := Component_Clause (Comp);
1820 -- Freezing a record type freezes the type of each of its
1821 -- components. However, if the type of the component is
1822 -- part of this record, we do not want or need a separate
1823 -- Freeze_Node. Note that Is_Itype is wrong because that's
1824 -- also set in private type cases. We also can't check for
1825 -- the Scope being exactly Rec because of private types and
1826 -- record extensions.
1828 if Is_Itype (Etype (Comp))
1829 and then Is_Record_Type (Underlying_Type
1830 (Scope (Etype (Comp))))
1832 Undelay_Type (Etype (Comp));
1835 Freeze_And_Append (Etype (Comp), N, Result);
1837 -- Check for error of component clause given for variable
1838 -- sized type. We have to delay this test till this point,
1839 -- since the component type has to be frozen for us to know
1840 -- if it is variable length. We omit this test in a generic
1841 -- context, it will be applied at instantiation time.
1843 -- We also omit this test in CodePeer mode, since we do not
1844 -- have sufficient info on size and representation clauses.
1846 if Present (CC) then
1847 Placed_Component := True;
1849 if Inside_A_Generic then
1852 elsif CodePeer_Mode then
1856 Size_Known_At_Compile_Time
1857 (Underlying_Type (Etype (Comp)))
1860 ("component clause not allowed for variable " &
1861 "length component", CC);
1865 Unplaced_Component := True;
1868 -- Case of component requires byte alignment
1870 if Must_Be_On_Byte_Boundary (Etype (Comp)) then
1872 -- Set the enclosing record to also require byte align
1874 Set_Must_Be_On_Byte_Boundary (Rec);
1876 -- Check for component clause that is inconsistent with
1877 -- the required byte boundary alignment.
1880 and then Normalized_First_Bit (Comp) mod
1881 System_Storage_Unit /= 0
1884 ("component & must be byte aligned",
1885 Component_Name (Component_Clause (Comp)));
1891 -- Gather data for possible Implicit_Packing later. Note that at
1892 -- this stage we might be dealing with a real component, or with
1893 -- an implicit subtype declaration.
1895 if not Is_Scalar_Type (Etype (Comp)) then
1896 All_Scalar_Components := False;
1898 Scalar_Component_Total_RM_Size :=
1899 Scalar_Component_Total_RM_Size + RM_Size (Etype (Comp));
1900 Scalar_Component_Total_Esize :=
1901 Scalar_Component_Total_Esize + Esize (Etype (Comp));
1904 -- If the component is an Itype with Delayed_Freeze and is either
1905 -- a record or array subtype and its base type has not yet been
1906 -- frozen, we must remove this from the entity list of this record
1907 -- and put it on the entity list of the scope of its base type.
1908 -- Note that we know that this is not the type of a component
1909 -- since we cleared Has_Delayed_Freeze for it in the previous
1910 -- loop. Thus this must be the Designated_Type of an access type,
1911 -- which is the type of a component.
1914 and then Is_Type (Scope (Comp))
1915 and then Is_Composite_Type (Comp)
1916 and then Base_Type (Comp) /= Comp
1917 and then Has_Delayed_Freeze (Comp)
1918 and then not Is_Frozen (Base_Type (Comp))
1921 Will_Be_Frozen : Boolean := False;
1925 -- We have a pretty bad kludge here. Suppose Rec is subtype
1926 -- being defined in a subprogram that's created as part of
1927 -- the freezing of Rec'Base. In that case, we know that
1928 -- Comp'Base must have already been frozen by the time we
1929 -- get to elaborate this because Gigi doesn't elaborate any
1930 -- bodies until it has elaborated all of the declarative
1931 -- part. But Is_Frozen will not be set at this point because
1932 -- we are processing code in lexical order.
1934 -- We detect this case by going up the Scope chain of Rec
1935 -- and seeing if we have a subprogram scope before reaching
1936 -- the top of the scope chain or that of Comp'Base. If we
1937 -- do, then mark that Comp'Base will actually be frozen. If
1938 -- so, we merely undelay it.
1941 while Present (S) loop
1942 if Is_Subprogram (S) then
1943 Will_Be_Frozen := True;
1945 elsif S = Scope (Base_Type (Comp)) then
1952 if Will_Be_Frozen then
1953 Undelay_Type (Comp);
1955 if Present (Prev) then
1956 Set_Next_Entity (Prev, Next_Entity (Comp));
1958 Set_First_Entity (Rec, Next_Entity (Comp));
1961 -- Insert in entity list of scope of base type (which
1962 -- must be an enclosing scope, because still unfrozen).
1964 Append_Entity (Comp, Scope (Base_Type (Comp)));
1968 -- If the component is an access type with an allocator as default
1969 -- value, the designated type will be frozen by the corresponding
1970 -- expression in init_proc. In order to place the freeze node for
1971 -- the designated type before that for the current record type,
1974 -- Same process if the component is an array of access types,
1975 -- initialized with an aggregate. If the designated type is
1976 -- private, it cannot contain allocators, and it is premature
1977 -- to freeze the type, so we check for this as well.
1979 elsif Is_Access_Type (Etype (Comp))
1980 and then Present (Parent (Comp))
1981 and then Present (Expression (Parent (Comp)))
1984 Alloc : constant Node_Id :=
1985 Check_Allocator (Expression (Parent (Comp)));
1988 if Present (Alloc) then
1990 -- If component is pointer to a classwide type, freeze
1991 -- the specific type in the expression being allocated.
1992 -- The expression may be a subtype indication, in which
1993 -- case freeze the subtype mark.
1995 if Is_Class_Wide_Type
1996 (Designated_Type (Etype (Comp)))
1998 if Is_Entity_Name (Expression (Alloc)) then
2000 (Entity (Expression (Alloc)), N, Result);
2002 Nkind (Expression (Alloc)) = N_Subtype_Indication
2005 (Entity (Subtype_Mark (Expression (Alloc))),
2009 elsif Is_Itype (Designated_Type (Etype (Comp))) then
2010 Check_Itype (Etype (Comp));
2014 (Designated_Type (Etype (Comp)), N, Result);
2019 elsif Is_Access_Type (Etype (Comp))
2020 and then Is_Itype (Designated_Type (Etype (Comp)))
2022 Check_Itype (Etype (Comp));
2024 elsif Is_Array_Type (Etype (Comp))
2025 and then Is_Access_Type (Component_Type (Etype (Comp)))
2026 and then Present (Parent (Comp))
2027 and then Nkind (Parent (Comp)) = N_Component_Declaration
2028 and then Present (Expression (Parent (Comp)))
2029 and then Nkind (Expression (Parent (Comp))) = N_Aggregate
2030 and then Is_Fully_Defined
2031 (Designated_Type (Component_Type (Etype (Comp))))
2035 (Component_Type (Etype (Comp))), N, Result);
2042 -- Deal with Bit_Order aspect specifying a non-default bit order
2044 if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then
2045 if not Placed_Component then
2047 Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
2048 Error_Msg_N ("?Bit_Order specification has no effect", ADC);
2050 ("\?since no component clauses were specified", ADC);
2052 -- Here is where we do the processing for reversed bit order
2055 Adjust_Record_For_Reverse_Bit_Order (Rec);
2059 -- Complete error checking on record representation clause (e.g.
2060 -- overlap of components). This is called after adjusting the
2061 -- record for reverse bit order.
2064 RRC : constant Node_Id := Get_Record_Representation_Clause (Rec);
2066 if Present (RRC) then
2067 Check_Record_Representation_Clause (RRC);
2071 -- Set OK_To_Reorder_Components depending on debug flags
2073 if Is_Base_Type (Rec) and then Convention (Rec) = Convention_Ada then
2074 if (Has_Discriminants (Rec) and then Debug_Flag_Dot_V)
2076 (not Has_Discriminants (Rec) and then Debug_Flag_Dot_R)
2078 Set_OK_To_Reorder_Components (Rec);
2082 -- Check for useless pragma Pack when all components placed. We only
2083 -- do this check for record types, not subtypes, since a subtype may
2084 -- have all its components placed, and it still makes perfectly good
2085 -- sense to pack other subtypes or the parent type. We do not give
2086 -- this warning if Optimize_Alignment is set to Space, since the
2087 -- pragma Pack does have an effect in this case (it always resets
2088 -- the alignment to one).
2090 if Ekind (Rec) = E_Record_Type
2091 and then Is_Packed (Rec)
2092 and then not Unplaced_Component
2093 and then Optimize_Alignment /= 'S'
2095 -- Reset packed status. Probably not necessary, but we do it so
2096 -- that there is no chance of the back end doing something strange
2097 -- with this redundant indication of packing.
2099 Set_Is_Packed (Rec, False);
2101 -- Give warning if redundant constructs warnings on
2103 if Warn_On_Redundant_Constructs then
2104 Error_Msg_N -- CODEFIX
2105 ("?pragma Pack has no effect, no unplaced components",
2106 Get_Rep_Pragma (Rec, Name_Pack));
2110 -- If this is the record corresponding to a remote type, freeze the
2111 -- remote type here since that is what we are semantically freezing.
2112 -- This prevents the freeze node for that type in an inner scope.
2114 -- Also, Check for controlled components and unchecked unions.
2115 -- Finally, enforce the restriction that access attributes with a
2116 -- current instance prefix can only apply to limited types.
2118 if Ekind (Rec) = E_Record_Type then
2119 if Present (Corresponding_Remote_Type (Rec)) then
2120 Freeze_And_Append (Corresponding_Remote_Type (Rec), N, Result);
2123 Comp := First_Component (Rec);
2124 while Present (Comp) loop
2126 -- Do not set Has_Controlled_Component on a class-wide
2127 -- equivalent type. See Make_CW_Equivalent_Type.
2129 if not Is_Class_Wide_Equivalent_Type (Rec)
2130 and then (Has_Controlled_Component (Etype (Comp))
2131 or else (Chars (Comp) /= Name_uParent
2132 and then Is_Controlled (Etype (Comp)))
2133 or else (Is_Protected_Type (Etype (Comp))
2135 (Corresponding_Record_Type
2137 and then Has_Controlled_Component
2138 (Corresponding_Record_Type
2141 Set_Has_Controlled_Component (Rec);
2145 if Has_Unchecked_Union (Etype (Comp)) then
2146 Set_Has_Unchecked_Union (Rec);
2149 if Has_Per_Object_Constraint (Comp) then
2151 -- Scan component declaration for likely misuses of current
2152 -- instance, either in a constraint or a default expression.
2154 Check_Current_Instance (Parent (Comp));
2157 Next_Component (Comp);
2161 Set_Component_Alignment_If_Not_Set (Rec);
2163 -- For first subtypes, check if there are any fixed-point fields with
2164 -- component clauses, where we must check the size. This is not done
2165 -- till the freeze point, since for fixed-point types, we do not know
2166 -- the size until the type is frozen. Similar processing applies to
2167 -- bit packed arrays.
2169 if Is_First_Subtype (Rec) then
2170 Comp := First_Component (Rec);
2171 while Present (Comp) loop
2172 if Present (Component_Clause (Comp))
2173 and then (Is_Fixed_Point_Type (Etype (Comp))
2175 Is_Bit_Packed_Array (Etype (Comp)))
2178 (Component_Name (Component_Clause (Comp)),
2184 Next_Component (Comp);
2188 -- Generate warning for applying C or C++ convention to a record
2189 -- with discriminants. This is suppressed for the unchecked union
2190 -- case, since the whole point in this case is interface C. We also
2191 -- do not generate this within instantiations, since we will have
2192 -- generated a message on the template.
2194 if Has_Discriminants (E)
2195 and then not Is_Unchecked_Union (E)
2196 and then (Convention (E) = Convention_C
2198 Convention (E) = Convention_CPP)
2199 and then Comes_From_Source (E)
2200 and then not In_Instance
2201 and then not Has_Warnings_Off (E)
2202 and then not Has_Warnings_Off (Base_Type (E))
2205 Cprag : constant Node_Id := Get_Rep_Pragma (E, Name_Convention);
2209 if Present (Cprag) then
2210 A2 := Next (First (Pragma_Argument_Associations (Cprag)));
2212 if Convention (E) = Convention_C then
2214 ("?variant record has no direct equivalent in C", A2);
2217 ("?variant record has no direct equivalent in C++", A2);
2221 ("\?use of convention for type& is dubious", A2, E);
2226 -- See if Size is too small as is (and implicit packing might help)
2228 if not Is_Packed (Rec)
2230 -- No implicit packing if even one component is explicitly placed
2232 and then not Placed_Component
2234 -- Must have size clause and all scalar components
2236 and then Has_Size_Clause (Rec)
2237 and then All_Scalar_Components
2239 -- Do not try implicit packing on records with discriminants, too
2240 -- complicated, especially in the variant record case.
2242 and then not Has_Discriminants (Rec)
2244 -- We can implicitly pack if the specified size of the record is
2245 -- less than the sum of the object sizes (no point in packing if
2246 -- this is not the case).
2248 and then RM_Size (Rec) < Scalar_Component_Total_Esize
2250 -- And the total RM size cannot be greater than the specified size
2251 -- since otherwise packing will not get us where we have to be!
2253 and then RM_Size (Rec) >= Scalar_Component_Total_RM_Size
2255 -- Never do implicit packing in CodePeer or Alfa modes since
2256 -- we don't do any packing in these modes, since this generates
2257 -- over-complex code that confuses static analysis, and in
2258 -- general, neither CodePeer not GNATprove care about the
2259 -- internal representation of objects.
2261 and then not (CodePeer_Mode or Alfa_Mode)
2263 -- If implicit packing enabled, do it
2265 if Implicit_Packing then
2266 Set_Is_Packed (Rec);
2268 -- Otherwise flag the size clause
2272 Sz : constant Node_Id := Size_Clause (Rec);
2274 Error_Msg_NE -- CODEFIX
2275 ("size given for& too small", Sz, Rec);
2276 Error_Msg_N -- CODEFIX
2277 ("\use explicit pragma Pack "
2278 & "or use pragma Implicit_Packing", Sz);
2282 end Freeze_Record_Type;
2284 -- Start of processing for Freeze_Entity
2287 -- We are going to test for various reasons why this entity need not be
2288 -- frozen here, but in the case of an Itype that's defined within a
2289 -- record, that test actually applies to the record.
2291 if Is_Itype (E) and then Is_Record_Type (Scope (E)) then
2292 Test_E := Scope (E);
2293 elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E)))
2294 and then Is_Record_Type (Underlying_Type (Scope (E)))
2296 Test_E := Underlying_Type (Scope (E));
2299 -- Do not freeze if already frozen since we only need one freeze node
2301 if Is_Frozen (E) then
2304 -- It is improper to freeze an external entity within a generic because
2305 -- its freeze node will appear in a non-valid context. The entity will
2306 -- be frozen in the proper scope after the current generic is analyzed.
2308 elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then
2311 -- AI05-0213: A formal incomplete type does not freeze the actual. In
2312 -- the instance, the same applies to the subtype renaming the actual.
2314 elsif Is_Private_Type (E)
2315 and then Is_Generic_Actual_Type (E)
2316 and then No (Full_View (Base_Type (E)))
2317 and then Ada_Version >= Ada_2012
2321 -- Do not freeze a global entity within an inner scope created during
2322 -- expansion. A call to subprogram E within some internal procedure
2323 -- (a stream attribute for example) might require freezing E, but the
2324 -- freeze node must appear in the same declarative part as E itself.
2325 -- The two-pass elaboration mechanism in gigi guarantees that E will
2326 -- be frozen before the inner call is elaborated. We exclude constants
2327 -- from this test, because deferred constants may be frozen early, and
2328 -- must be diagnosed (e.g. in the case of a deferred constant being used
2329 -- in a default expression). If the enclosing subprogram comes from
2330 -- source, or is a generic instance, then the freeze point is the one
2331 -- mandated by the language, and we freeze the entity. A subprogram that
2332 -- is a child unit body that acts as a spec does not have a spec that
2333 -- comes from source, but can only come from source.
2335 elsif In_Open_Scopes (Scope (Test_E))
2336 and then Scope (Test_E) /= Current_Scope
2337 and then Ekind (Test_E) /= E_Constant
2344 while Present (S) loop
2345 if Is_Overloadable (S) then
2346 if Comes_From_Source (S)
2347 or else Is_Generic_Instance (S)
2348 or else Is_Child_Unit (S)
2360 -- Similarly, an inlined instance body may make reference to global
2361 -- entities, but these references cannot be the proper freezing point
2362 -- for them, and in the absence of inlining freezing will take place in
2363 -- their own scope. Normally instance bodies are analyzed after the
2364 -- enclosing compilation, and everything has been frozen at the proper
2365 -- place, but with front-end inlining an instance body is compiled
2366 -- before the end of the enclosing scope, and as a result out-of-order
2367 -- freezing must be prevented.
2369 elsif Front_End_Inlining
2370 and then In_Instance_Body
2371 and then Present (Scope (Test_E))
2377 S := Scope (Test_E);
2378 while Present (S) loop
2379 if Is_Generic_Instance (S) then
2392 -- Deal with delayed aspect specifications. The analysis of the aspect
2393 -- is required to be delayed to the freeze point, so we evaluate the
2394 -- pragma or attribute definition clause in the tree at this point.
2396 if Has_Delayed_Aspects (E) then
2402 -- Look for aspect specification entries for this entity
2404 Ritem := First_Rep_Item (E);
2405 while Present (Ritem) loop
2406 if Nkind (Ritem) = N_Aspect_Specification
2407 and then Entity (Ritem) = E
2408 and then Is_Delayed_Aspect (Ritem)
2409 and then Scope (E) = Current_Scope
2411 Aitem := Aspect_Rep_Item (Ritem);
2413 -- Skip if this is an aspect with no corresponding pragma
2414 -- or attribute definition node (such as Default_Value).
2416 if Present (Aitem) then
2417 Set_Parent (Aitem, Ritem);
2422 Next_Rep_Item (Ritem);
2427 -- Here to freeze the entity
2431 -- Case of entity being frozen is other than a type
2433 if not Is_Type (E) then
2435 -- If entity is exported or imported and does not have an external
2436 -- name, now is the time to provide the appropriate default name.
2437 -- Skip this if the entity is stubbed, since we don't need a name
2438 -- for any stubbed routine. For the case on intrinsics, if no
2439 -- external name is specified, then calls will be handled in
2440 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
2441 -- external name is provided, then Expand_Intrinsic_Call leaves
2442 -- calls in place for expansion by GIGI.
2444 if (Is_Imported (E) or else Is_Exported (E))
2445 and then No (Interface_Name (E))
2446 and then Convention (E) /= Convention_Stubbed
2447 and then Convention (E) /= Convention_Intrinsic
2449 Set_Encoded_Interface_Name
2450 (E, Get_Default_External_Name (E));
2452 -- If entity is an atomic object appearing in a declaration and
2453 -- the expression is an aggregate, assign it to a temporary to
2454 -- ensure that the actual assignment is done atomically rather
2455 -- than component-wise (the assignment to the temp may be done
2456 -- component-wise, but that is harmless).
2459 and then Nkind (Parent (E)) = N_Object_Declaration
2460 and then Present (Expression (Parent (E)))
2461 and then Nkind (Expression (Parent (E))) = N_Aggregate
2462 and then Is_Atomic_Aggregate (Expression (Parent (E)), Etype (E))
2467 -- For a subprogram, freeze all parameter types and also the return
2468 -- type (RM 13.14(14)). However skip this for internal subprograms.
2469 -- This is also the point where any extra formal parameters are
2470 -- created since we now know whether the subprogram will use a
2471 -- foreign convention.
2473 if Is_Subprogram (E) then
2474 if not Is_Internal (E) then
2478 Warn_Node : Node_Id;
2481 -- Loop through formals
2483 Formal := First_Formal (E);
2484 while Present (Formal) loop
2485 F_Type := Etype (Formal);
2487 -- AI05-0151 : incomplete types can appear in a profile.
2488 -- By the time the entity is frozen, the full view must
2489 -- be available, unless it is a limited view.
2491 if Is_Incomplete_Type (F_Type)
2492 and then Present (Full_View (F_Type))
2494 F_Type := Full_View (F_Type);
2495 Set_Etype (Formal, F_Type);
2498 Freeze_And_Append (F_Type, N, Result);
2500 if Is_Private_Type (F_Type)
2501 and then Is_Private_Type (Base_Type (F_Type))
2502 and then No (Full_View (Base_Type (F_Type)))
2503 and then not Is_Generic_Type (F_Type)
2504 and then not Is_Derived_Type (F_Type)
2506 -- If the type of a formal is incomplete, subprogram
2507 -- is being frozen prematurely. Within an instance
2508 -- (but not within a wrapper package) this is an
2509 -- artifact of our need to regard the end of an
2510 -- instantiation as a freeze point. Otherwise it is
2511 -- a definite error.
2514 Set_Is_Frozen (E, False);
2517 elsif not After_Last_Declaration
2518 and then not Freezing_Library_Level_Tagged_Type
2520 Error_Msg_Node_1 := F_Type;
2522 ("type& must be fully defined before this point",
2527 -- Check suspicious parameter for C function. These tests
2528 -- apply only to exported/imported subprograms.
2530 if Warn_On_Export_Import
2531 and then Comes_From_Source (E)
2532 and then (Convention (E) = Convention_C
2534 Convention (E) = Convention_CPP)
2535 and then (Is_Imported (E) or else Is_Exported (E))
2536 and then Convention (E) /= Convention (Formal)
2537 and then not Has_Warnings_Off (E)
2538 and then not Has_Warnings_Off (F_Type)
2539 and then not Has_Warnings_Off (Formal)
2541 -- Qualify mention of formals with subprogram name
2543 Error_Msg_Qual_Level := 1;
2545 -- Check suspicious use of fat C pointer
2547 if Is_Access_Type (F_Type)
2548 and then Esize (F_Type) > Ttypes.System_Address_Size
2551 ("?type of & does not correspond to C pointer!",
2554 -- Check suspicious return of boolean
2556 elsif Root_Type (F_Type) = Standard_Boolean
2557 and then Convention (F_Type) = Convention_Ada
2558 and then not Has_Warnings_Off (F_Type)
2559 and then not Has_Size_Clause (F_Type)
2560 and then VM_Target = No_VM
2562 Error_Msg_N ("& is an 8-bit Ada Boolean?", Formal);
2564 ("\use appropriate corresponding type in C "
2565 & "(e.g. char)?", Formal);
2567 -- Check suspicious tagged type
2569 elsif (Is_Tagged_Type (F_Type)
2570 or else (Is_Access_Type (F_Type)
2573 (Designated_Type (F_Type))))
2574 and then Convention (E) = Convention_C
2577 ("?& involves a tagged type which does not "
2578 & "correspond to any C type!", Formal);
2580 -- Check wrong convention subprogram pointer
2582 elsif Ekind (F_Type) = E_Access_Subprogram_Type
2583 and then not Has_Foreign_Convention (F_Type)
2586 ("?subprogram pointer & should "
2587 & "have foreign convention!", Formal);
2588 Error_Msg_Sloc := Sloc (F_Type);
2590 ("\?add Convention pragma to declaration of &#",
2594 -- Turn off name qualification after message output
2596 Error_Msg_Qual_Level := 0;
2599 -- Check for unconstrained array in exported foreign
2602 if Has_Foreign_Convention (E)
2603 and then not Is_Imported (E)
2604 and then Is_Array_Type (F_Type)
2605 and then not Is_Constrained (F_Type)
2606 and then Warn_On_Export_Import
2608 -- Exclude VM case, since both .NET and JVM can handle
2609 -- unconstrained arrays without a problem.
2611 and then VM_Target = No_VM
2613 Error_Msg_Qual_Level := 1;
2615 -- If this is an inherited operation, place the
2616 -- warning on the derived type declaration, rather
2617 -- than on the original subprogram.
2619 if Nkind (Original_Node (Parent (E))) =
2620 N_Full_Type_Declaration
2622 Warn_Node := Parent (E);
2624 if Formal = First_Formal (E) then
2626 ("?in inherited operation&", Warn_Node, E);
2629 Warn_Node := Formal;
2633 ("?type of argument& is unconstrained array",
2636 ("?foreign caller must pass bounds explicitly",
2638 Error_Msg_Qual_Level := 0;
2641 if not From_With_Type (F_Type) then
2642 if Is_Access_Type (F_Type) then
2643 F_Type := Designated_Type (F_Type);
2646 -- If the formal is an anonymous_access_to_subprogram
2647 -- freeze the subprogram type as well, to prevent
2648 -- scope anomalies in gigi, because there is no other
2649 -- clear point at which it could be frozen.
2651 if Is_Itype (Etype (Formal))
2652 and then Ekind (F_Type) = E_Subprogram_Type
2654 Freeze_And_Append (F_Type, N, Result);
2658 Next_Formal (Formal);
2661 -- Case of function: similar checks on return type
2663 if Ekind (E) = E_Function then
2665 -- Freeze return type
2667 R_Type := Etype (E);
2669 -- AI05-0151: the return type may have been incomplete
2670 -- at the point of declaration.
2672 if Ekind (R_Type) = E_Incomplete_Type
2673 and then Present (Full_View (R_Type))
2675 R_Type := Full_View (R_Type);
2676 Set_Etype (E, R_Type);
2679 Freeze_And_Append (R_Type, N, Result);
2681 -- Check suspicious return type for C function
2683 if Warn_On_Export_Import
2684 and then (Convention (E) = Convention_C
2686 Convention (E) = Convention_CPP)
2687 and then (Is_Imported (E) or else Is_Exported (E))
2689 -- Check suspicious return of fat C pointer
2691 if Is_Access_Type (R_Type)
2692 and then Esize (R_Type) > Ttypes.System_Address_Size
2693 and then not Has_Warnings_Off (E)
2694 and then not Has_Warnings_Off (R_Type)
2697 ("?return type of& does not "
2698 & "correspond to C pointer!", E);
2700 -- Check suspicious return of boolean
2702 elsif Root_Type (R_Type) = Standard_Boolean
2703 and then Convention (R_Type) = Convention_Ada
2704 and then VM_Target = No_VM
2705 and then not Has_Warnings_Off (E)
2706 and then not Has_Warnings_Off (R_Type)
2707 and then not Has_Size_Clause (R_Type)
2710 N : constant Node_Id :=
2711 Result_Definition (Declaration_Node (E));
2714 ("return type of & is an 8-bit Ada Boolean?",
2717 ("\use appropriate corresponding type in C "
2718 & "(e.g. char)?", N, E);
2721 -- Check suspicious return tagged type
2723 elsif (Is_Tagged_Type (R_Type)
2724 or else (Is_Access_Type (R_Type)
2727 (Designated_Type (R_Type))))
2728 and then Convention (E) = Convention_C
2729 and then not Has_Warnings_Off (E)
2730 and then not Has_Warnings_Off (R_Type)
2733 ("?return type of & does not "
2734 & "correspond to C type!", E);
2736 -- Check return of wrong convention subprogram pointer
2738 elsif Ekind (R_Type) = E_Access_Subprogram_Type
2739 and then not Has_Foreign_Convention (R_Type)
2740 and then not Has_Warnings_Off (E)
2741 and then not Has_Warnings_Off (R_Type)
2744 ("?& should return a foreign "
2745 & "convention subprogram pointer", E);
2746 Error_Msg_Sloc := Sloc (R_Type);
2748 ("\?add Convention pragma to declaration of& #",
2753 -- Give warning for suspicious return of a result of an
2754 -- unconstrained array type in a foreign convention
2757 if Has_Foreign_Convention (E)
2759 -- We are looking for a return of unconstrained array
2761 and then Is_Array_Type (R_Type)
2762 and then not Is_Constrained (R_Type)
2764 -- Exclude imported routines, the warning does not
2765 -- belong on the import, but rather on the routine
2768 and then not Is_Imported (E)
2770 -- Exclude VM case, since both .NET and JVM can handle
2771 -- return of unconstrained arrays without a problem.
2773 and then VM_Target = No_VM
2775 -- Check that general warning is enabled, and that it
2776 -- is not suppressed for this particular case.
2778 and then Warn_On_Export_Import
2779 and then not Has_Warnings_Off (E)
2780 and then not Has_Warnings_Off (R_Type)
2783 ("?foreign convention function& should not " &
2784 "return unconstrained array!", E);
2790 -- Must freeze its parent first if it is a derived subprogram
2792 if Present (Alias (E)) then
2793 Freeze_And_Append (Alias (E), N, Result);
2796 -- We don't freeze internal subprograms, because we don't normally
2797 -- want addition of extra formals or mechanism setting to happen
2798 -- for those. However we do pass through predefined dispatching
2799 -- cases, since extra formals may be needed in some cases, such as
2800 -- for the stream 'Input function (build-in-place formals).
2802 if not Is_Internal (E)
2803 or else Is_Predefined_Dispatching_Operation (E)
2805 Freeze_Subprogram (E);
2808 -- Here for other than a subprogram or type
2811 -- If entity has a type, and it is not a generic unit, then
2812 -- freeze it first (RM 13.14(10)).
2814 if Present (Etype (E))
2815 and then Ekind (E) /= E_Generic_Function
2817 Freeze_And_Append (Etype (E), N, Result);
2820 -- Special processing for objects created by object declaration
2822 if Nkind (Declaration_Node (E)) = N_Object_Declaration then
2824 -- Abstract type allowed only for C++ imported variables or
2827 -- Note: we inhibit this check for objects that do not come
2828 -- from source because there is at least one case (the
2829 -- expansion of x'Class'Input where x is abstract) where we
2830 -- legitimately generate an abstract object.
2832 if Is_Abstract_Type (Etype (E))
2833 and then Comes_From_Source (Parent (E))
2834 and then not (Is_Imported (E)
2835 and then Is_CPP_Class (Etype (E)))
2837 Error_Msg_N ("type of object cannot be abstract",
2838 Object_Definition (Parent (E)));
2840 if Is_CPP_Class (Etype (E)) then
2842 ("\} may need a cpp_constructor",
2843 Object_Definition (Parent (E)), Etype (E));
2847 -- For object created by object declaration, perform required
2848 -- categorization (preelaborate and pure) checks. Defer these
2849 -- checks to freeze time since pragma Import inhibits default
2850 -- initialization and thus pragma Import affects these checks.
2852 Validate_Object_Declaration (Declaration_Node (E));
2854 -- If there is an address clause, check that it is valid
2856 Check_Address_Clause (E);
2858 -- If the object needs any kind of default initialization, an
2859 -- error must be issued if No_Default_Initialization applies.
2860 -- The check doesn't apply to imported objects, which are not
2861 -- ever default initialized, and is why the check is deferred
2862 -- until freezing, at which point we know if Import applies.
2863 -- Deferred constants are also exempted from this test because
2864 -- their completion is explicit, or through an import pragma.
2866 if Ekind (E) = E_Constant
2867 and then Present (Full_View (E))
2871 elsif Comes_From_Source (E)
2872 and then not Is_Imported (E)
2873 and then not Has_Init_Expression (Declaration_Node (E))
2875 ((Has_Non_Null_Base_Init_Proc (Etype (E))
2876 and then not No_Initialization (Declaration_Node (E))
2877 and then not Is_Value_Type (Etype (E))
2878 and then not Initialization_Suppressed (Etype (E)))
2880 (Needs_Simple_Initialization (Etype (E))
2881 and then not Is_Internal (E)))
2883 Has_Default_Initialization := True;
2885 (No_Default_Initialization, Declaration_Node (E));
2888 -- Check that a Thread_Local_Storage variable does not have
2889 -- default initialization, and any explicit initialization must
2890 -- either be the null constant or a static constant.
2892 if Has_Pragma_Thread_Local_Storage (E) then
2894 Decl : constant Node_Id := Declaration_Node (E);
2896 if Has_Default_Initialization
2898 (Has_Init_Expression (Decl)
2900 (No (Expression (Decl))
2902 (Is_Static_Expression (Expression (Decl))
2904 Nkind (Expression (Decl)) = N_Null)))
2907 ("Thread_Local_Storage variable& is "
2908 & "improperly initialized", Decl, E);
2910 ("\only allowed initialization is explicit "
2911 & "NULL or static expression", Decl, E);
2916 -- For imported objects, set Is_Public unless there is also an
2917 -- address clause, which means that there is no external symbol
2918 -- needed for the Import (Is_Public may still be set for other
2919 -- unrelated reasons). Note that we delayed this processing
2920 -- till freeze time so that we can be sure not to set the flag
2921 -- if there is an address clause. If there is such a clause,
2922 -- then the only purpose of the Import pragma is to suppress
2923 -- implicit initialization.
2926 and then No (Address_Clause (E))
2931 -- For convention C objects of an enumeration type, warn if
2932 -- the size is not integer size and no explicit size given.
2933 -- Skip warning for Boolean, and Character, assume programmer
2934 -- expects 8-bit sizes for these cases.
2936 if (Convention (E) = Convention_C
2938 Convention (E) = Convention_CPP)
2939 and then Is_Enumeration_Type (Etype (E))
2940 and then not Is_Character_Type (Etype (E))
2941 and then not Is_Boolean_Type (Etype (E))
2942 and then Esize (Etype (E)) < Standard_Integer_Size
2943 and then not Has_Size_Clause (E)
2945 Error_Msg_Uint_1 := UI_From_Int (Standard_Integer_Size);
2947 ("?convention C enumeration object has size less than ^",
2949 Error_Msg_N ("\?use explicit size clause to set size", E);
2953 -- Check that a constant which has a pragma Volatile[_Components]
2954 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
2956 -- Note: Atomic[_Components] also sets Volatile[_Components]
2958 if Ekind (E) = E_Constant
2959 and then (Has_Volatile_Components (E) or else Is_Volatile (E))
2960 and then not Is_Imported (E)
2962 -- Make sure we actually have a pragma, and have not merely
2963 -- inherited the indication from elsewhere (e.g. an address
2964 -- clause, which is not good enough in RM terms!)
2966 if Has_Rep_Pragma (E, Name_Atomic)
2968 Has_Rep_Pragma (E, Name_Atomic_Components)
2971 ("stand alone atomic constant must be " &
2972 "imported (RM C.6(13))", E);
2974 elsif Has_Rep_Pragma (E, Name_Volatile)
2976 Has_Rep_Pragma (E, Name_Volatile_Components)
2979 ("stand alone volatile constant must be " &
2980 "imported (RM C.6(13))", E);
2984 -- Static objects require special handling
2986 if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
2987 and then Is_Statically_Allocated (E)
2989 Freeze_Static_Object (E);
2992 -- Remaining step is to layout objects
2994 if Ekind (E) = E_Variable
2996 Ekind (E) = E_Constant
2998 Ekind (E) = E_Loop_Parameter
3006 -- Case of a type or subtype being frozen
3009 -- We used to check here that a full type must have preelaborable
3010 -- initialization if it completes a private type specified with
3011 -- pragma Preelaborable_Initialization, but that missed cases where
3012 -- the types occur within a generic package, since the freezing
3013 -- that occurs within a containing scope generally skips traversal
3014 -- of a generic unit's declarations (those will be frozen within
3015 -- instances). This check was moved to Analyze_Package_Specification.
3017 -- The type may be defined in a generic unit. This can occur when
3018 -- freezing a generic function that returns the type (which is
3019 -- defined in a parent unit). It is clearly meaningless to freeze
3020 -- this type. However, if it is a subtype, its size may be determi-
3021 -- nable and used in subsequent checks, so might as well try to
3024 if Present (Scope (E))
3025 and then Is_Generic_Unit (Scope (E))
3027 Check_Compile_Time_Size (E);
3031 -- Deal with special cases of freezing for subtype
3033 if E /= Base_Type (E) then
3035 -- Before we do anything else, a specialized test for the case of
3036 -- a size given for an array where the array needs to be packed,
3037 -- but was not so the size cannot be honored. This would of course
3038 -- be caught by the backend, and indeed we don't catch all cases.
3039 -- The point is that we can give a better error message in those
3040 -- cases that we do catch with the circuitry here. Also if pragma
3041 -- Implicit_Packing is set, this is where the packing occurs.
3043 -- The reason we do this so early is that the processing in the
3044 -- automatic packing case affects the layout of the base type, so
3045 -- it must be done before we freeze the base type.
3047 if Is_Array_Type (E) then
3050 Ctyp : constant Entity_Id := Component_Type (E);
3053 -- Check enabling conditions. These are straightforward
3054 -- except for the test for a limited composite type. This
3055 -- eliminates the rare case of a array of limited components
3056 -- where there are issues of whether or not we can go ahead
3057 -- and pack the array (since we can't freely pack and unpack
3058 -- arrays if they are limited).
3060 -- Note that we check the root type explicitly because the
3061 -- whole point is we are doing this test before we have had
3062 -- a chance to freeze the base type (and it is that freeze
3063 -- action that causes stuff to be inherited).
3065 if Present (Size_Clause (E))
3066 and then Known_Static_RM_Size (E)
3067 and then not Is_Packed (E)
3068 and then not Has_Pragma_Pack (E)
3069 and then Number_Dimensions (E) = 1
3070 and then not Has_Component_Size_Clause (E)
3071 and then Known_Static_RM_Size (Ctyp)
3072 and then not Is_Limited_Composite (E)
3073 and then not Is_Packed (Root_Type (E))
3074 and then not Has_Component_Size_Clause (Root_Type (E))
3075 and then not (CodePeer_Mode or Alfa_Mode)
3077 Get_Index_Bounds (First_Index (E), Lo, Hi);
3079 if Compile_Time_Known_Value (Lo)
3080 and then Compile_Time_Known_Value (Hi)
3081 and then Known_Static_RM_Size (Ctyp)
3082 and then RM_Size (Ctyp) < 64
3085 Lov : constant Uint := Expr_Value (Lo);
3086 Hiv : constant Uint := Expr_Value (Hi);
3087 Len : constant Uint := UI_Max
3090 Rsiz : constant Uint := RM_Size (Ctyp);
3091 SZ : constant Node_Id := Size_Clause (E);
3092 Btyp : constant Entity_Id := Base_Type (E);
3094 -- What we are looking for here is the situation where
3095 -- the RM_Size given would be exactly right if there
3096 -- was a pragma Pack (resulting in the component size
3097 -- being the same as the RM_Size). Furthermore, the
3098 -- component type size must be an odd size (not a
3099 -- multiple of storage unit). If the component RM size
3100 -- is an exact number of storage units that is a power
3101 -- of two, the array is not packed and has a standard
3105 if RM_Size (E) = Len * Rsiz
3106 and then Rsiz mod System_Storage_Unit /= 0
3108 -- For implicit packing mode, just set the
3109 -- component size silently.
3111 if Implicit_Packing then
3112 Set_Component_Size (Btyp, Rsiz);
3113 Set_Is_Bit_Packed_Array (Btyp);
3114 Set_Is_Packed (Btyp);
3115 Set_Has_Non_Standard_Rep (Btyp);
3117 -- Otherwise give an error message
3121 ("size given for& too small", SZ, E);
3122 Error_Msg_N -- CODEFIX
3123 ("\use explicit pragma Pack "
3124 & "or use pragma Implicit_Packing", SZ);
3127 elsif RM_Size (E) = Len * Rsiz
3128 and then Implicit_Packing
3130 (Rsiz / System_Storage_Unit = 1
3131 or else Rsiz / System_Storage_Unit = 2
3132 or else Rsiz / System_Storage_Unit = 4)
3135 -- Not a packed array, but indicate the desired
3136 -- component size, for the back-end.
3138 Set_Component_Size (Btyp, Rsiz);
3146 -- If ancestor subtype present, freeze that first. Note that this
3147 -- will also get the base type frozen. Need RM reference ???
3149 Atype := Ancestor_Subtype (E);
3151 if Present (Atype) then
3152 Freeze_And_Append (Atype, N, Result);
3154 -- No ancestor subtype present
3157 -- See if we have a nearest ancestor that has a predicate.
3158 -- That catches the case of derived type with a predicate.
3159 -- Need RM reference here ???
3161 Atype := Nearest_Ancestor (E);
3163 if Present (Atype) and then Has_Predicates (Atype) then
3164 Freeze_And_Append (Atype, N, Result);
3167 -- Freeze base type before freezing the entity (RM 13.14(15))
3169 if E /= Base_Type (E) then
3170 Freeze_And_Append (Base_Type (E), N, Result);
3174 -- For a derived type, freeze its parent type first (RM 13.14(15))
3176 elsif Is_Derived_Type (E) then
3177 Freeze_And_Append (Etype (E), N, Result);
3178 Freeze_And_Append (First_Subtype (Etype (E)), N, Result);
3181 -- For array type, freeze index types and component type first
3182 -- before freezing the array (RM 13.14(15)).
3184 if Is_Array_Type (E) then
3186 FS : constant Entity_Id := First_Subtype (E);
3187 Ctyp : constant Entity_Id := Component_Type (E);
3190 Non_Standard_Enum : Boolean := False;
3191 -- Set true if any of the index types is an enumeration type
3192 -- with a non-standard representation.
3195 Freeze_And_Append (Ctyp, N, Result);
3197 Indx := First_Index (E);
3198 while Present (Indx) loop
3199 Freeze_And_Append (Etype (Indx), N, Result);
3201 if Is_Enumeration_Type (Etype (Indx))
3202 and then Has_Non_Standard_Rep (Etype (Indx))
3204 Non_Standard_Enum := True;
3210 -- Processing that is done only for base types
3212 if Ekind (E) = E_Array_Type then
3214 -- Propagate flags for component type
3216 if Is_Controlled (Component_Type (E))
3217 or else Has_Controlled_Component (Ctyp)
3219 Set_Has_Controlled_Component (E);
3222 if Has_Unchecked_Union (Component_Type (E)) then
3223 Set_Has_Unchecked_Union (E);
3226 -- If packing was requested or if the component size was set
3227 -- explicitly, then see if bit packing is required. This
3228 -- processing is only done for base types, since all the
3229 -- representation aspects involved are type-related. This
3230 -- is not just an optimization, if we start processing the
3231 -- subtypes, they interfere with the settings on the base
3232 -- type (this is because Is_Packed has a slightly different
3233 -- meaning before and after freezing).
3240 if (Is_Packed (E) or else Has_Pragma_Pack (E))
3241 and then Known_Static_RM_Size (Ctyp)
3242 and then not Has_Component_Size_Clause (E)
3244 Csiz := UI_Max (RM_Size (Ctyp), 1);
3246 elsif Known_Component_Size (E) then
3247 Csiz := Component_Size (E);
3249 elsif not Known_Static_Esize (Ctyp) then
3253 Esiz := Esize (Ctyp);
3255 -- We can set the component size if it is less than
3256 -- 16, rounding it up to the next storage unit size.
3260 elsif Esiz <= 16 then
3266 -- Set component size up to match alignment if it
3267 -- would otherwise be less than the alignment. This
3268 -- deals with cases of types whose alignment exceeds
3269 -- their size (padded types).
3273 A : constant Uint := Alignment_In_Bits (Ctyp);
3282 -- Case of component size that may result in packing
3284 if 1 <= Csiz and then Csiz <= 64 then
3286 Ent : constant Entity_Id :=
3288 Pack_Pragma : constant Node_Id :=
3289 Get_Rep_Pragma (Ent, Name_Pack);
3290 Comp_Size_C : constant Node_Id :=
3291 Get_Attribute_Definition_Clause
3292 (Ent, Attribute_Component_Size);
3294 -- Warn if we have pack and component size so that
3295 -- the pack is ignored.
3297 -- Note: here we must check for the presence of a
3298 -- component size before checking for a Pack pragma
3299 -- to deal with the case where the array type is a
3300 -- derived type whose parent is currently private.
3302 if Present (Comp_Size_C)
3303 and then Has_Pragma_Pack (Ent)
3304 and then Warn_On_Redundant_Constructs
3306 Error_Msg_Sloc := Sloc (Comp_Size_C);
3308 ("?pragma Pack for& ignored!",
3311 ("\?explicit component size given#!",
3313 Set_Is_Packed (Base_Type (Ent), False);
3314 Set_Is_Bit_Packed_Array (Base_Type (Ent), False);
3317 -- Set component size if not already set by a
3318 -- component size clause.
3320 if not Present (Comp_Size_C) then
3321 Set_Component_Size (E, Csiz);
3324 -- Check for base type of 8, 16, 32 bits, where an
3325 -- unsigned subtype has a length one less than the
3326 -- base type (e.g. Natural subtype of Integer).
3328 -- In such cases, if a component size was not set
3329 -- explicitly, then generate a warning.
3331 if Has_Pragma_Pack (E)
3332 and then not Present (Comp_Size_C)
3334 (Csiz = 7 or else Csiz = 15 or else Csiz = 31)
3335 and then Esize (Base_Type (Ctyp)) = Csiz + 1
3337 Error_Msg_Uint_1 := Csiz;
3339 if Present (Pack_Pragma) then
3341 ("?pragma Pack causes component size "
3342 & "to be ^!", Pack_Pragma);
3344 ("\?use Component_Size to set "
3345 & "desired value!", Pack_Pragma);
3349 -- Actual packing is not needed for 8, 16, 32, 64.
3350 -- Also not needed for 24 if alignment is 1.
3356 or else (Csiz = 24 and then Alignment (Ctyp) = 1)
3358 -- Here the array was requested to be packed,
3359 -- but the packing request had no effect, so
3360 -- Is_Packed is reset.
3362 -- Note: semantically this means that we lose
3363 -- track of the fact that a derived type
3364 -- inherited a pragma Pack that was non-
3365 -- effective, but that seems fine.
3367 -- We regard a Pack pragma as a request to set
3368 -- a representation characteristic, and this
3369 -- request may be ignored.
3371 Set_Is_Packed (Base_Type (E), False);
3372 Set_Is_Bit_Packed_Array (Base_Type (E), False);
3374 if Known_Static_Esize (Component_Type (E))
3375 and then Esize (Component_Type (E)) = Csiz
3377 Set_Has_Non_Standard_Rep
3378 (Base_Type (E), False);
3381 -- In all other cases, packing is indeed needed
3384 Set_Has_Non_Standard_Rep (Base_Type (E), True);
3385 Set_Is_Bit_Packed_Array (Base_Type (E), True);
3386 Set_Is_Packed (Base_Type (E), True);
3392 -- Check for Atomic_Components or Aliased with unsuitable
3393 -- packing or explicit component size clause given.
3395 if (Has_Atomic_Components (E)
3396 or else Has_Aliased_Components (E))
3397 and then (Has_Component_Size_Clause (E)
3398 or else Is_Packed (E))
3400 Alias_Atomic_Check : declare
3402 procedure Complain_CS (T : String);
3403 -- Outputs error messages for incorrect CS clause or
3404 -- pragma Pack for aliased or atomic components (T is
3405 -- "aliased" or "atomic");
3411 procedure Complain_CS (T : String) is
3413 if Has_Component_Size_Clause (E) then
3415 Get_Attribute_Definition_Clause
3416 (FS, Attribute_Component_Size);
3418 if Known_Static_Esize (Ctyp) then
3420 ("incorrect component size for "
3421 & T & " components", Clause);
3422 Error_Msg_Uint_1 := Esize (Ctyp);
3424 ("\only allowed value is^", Clause);
3428 ("component size cannot be given for "
3429 & T & " components", Clause);
3434 ("cannot pack " & T & " components",
3435 Get_Rep_Pragma (FS, Name_Pack));
3441 -- Start of processing for Alias_Atomic_Check
3445 -- If object size of component type isn't known, we
3446 -- cannot be sure so we defer to the back end.
3448 if not Known_Static_Esize (Ctyp) then
3451 -- Case where component size has no effect. First
3452 -- check for object size of component type multiple
3453 -- of the storage unit size.
3455 elsif Esize (Ctyp) mod System_Storage_Unit = 0
3457 -- OK in both packing case and component size case
3458 -- if RM size is known and static and the same as
3462 ((Known_Static_RM_Size (Ctyp)
3463 and then Esize (Ctyp) = RM_Size (Ctyp))
3465 -- Or if we have an explicit component size
3466 -- clause and the component size and object size
3470 (Has_Component_Size_Clause (E)
3471 and then Component_Size (E) = Esize (Ctyp)))
3475 elsif Has_Aliased_Components (E)
3476 or else Is_Aliased (Ctyp)
3478 Complain_CS ("aliased");
3480 elsif Has_Atomic_Components (E)
3481 or else Is_Atomic (Ctyp)
3483 Complain_CS ("atomic");
3485 end Alias_Atomic_Check;
3488 -- Warn for case of atomic type
3490 Clause := Get_Rep_Pragma (FS, Name_Atomic);
3493 and then not Addressable (Component_Size (FS))
3496 ("non-atomic components of type& may not be "
3497 & "accessible by separate tasks?", Clause, E);
3499 if Has_Component_Size_Clause (E) then
3502 (Get_Attribute_Definition_Clause
3503 (FS, Attribute_Component_Size));
3505 ("\because of component size clause#?",
3508 elsif Has_Pragma_Pack (E) then
3510 Sloc (Get_Rep_Pragma (FS, Name_Pack));
3512 ("\because of pragma Pack#?", Clause);
3516 -- Processing that is done only for subtypes
3519 -- Acquire alignment from base type
3521 if Unknown_Alignment (E) then
3522 Set_Alignment (E, Alignment (Base_Type (E)));
3523 Adjust_Esize_Alignment (E);
3527 -- For bit-packed arrays, check the size
3529 if Is_Bit_Packed_Array (E) and then Known_RM_Size (E) then
3531 SizC : constant Node_Id := Size_Clause (E);
3534 pragma Warnings (Off, Discard);
3537 -- It is not clear if it is possible to have no size
3538 -- clause at this stage, but it is not worth worrying
3539 -- about. Post error on the entity name in the size
3540 -- clause if present, else on the type entity itself.
3542 if Present (SizC) then
3543 Check_Size (Name (SizC), E, RM_Size (E), Discard);
3545 Check_Size (E, E, RM_Size (E), Discard);
3550 -- If any of the index types was an enumeration type with a
3551 -- non-standard rep clause, then we indicate that the array
3552 -- type is always packed (even if it is not bit packed).
3554 if Non_Standard_Enum then
3555 Set_Has_Non_Standard_Rep (Base_Type (E));
3556 Set_Is_Packed (Base_Type (E));
3559 Set_Component_Alignment_If_Not_Set (E);
3561 -- If the array is packed, we must create the packed array
3562 -- type to be used to actually implement the type. This is
3563 -- only needed for real array types (not for string literal
3564 -- types, since they are present only for the front end).
3567 and then Ekind (E) /= E_String_Literal_Subtype
3569 Create_Packed_Array_Type (E);
3570 Freeze_And_Append (Packed_Array_Type (E), N, Result);
3572 -- Size information of packed array type is copied to the
3573 -- array type, since this is really the representation. But
3574 -- do not override explicit existing size values. If the
3575 -- ancestor subtype is constrained the packed_array_type
3576 -- will be inherited from it, but the size may have been
3577 -- provided already, and must not be overridden either.
3579 if not Has_Size_Clause (E)
3581 (No (Ancestor_Subtype (E))
3582 or else not Has_Size_Clause (Ancestor_Subtype (E)))
3584 Set_Esize (E, Esize (Packed_Array_Type (E)));
3585 Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
3588 if not Has_Alignment_Clause (E) then
3589 Set_Alignment (E, Alignment (Packed_Array_Type (E)));
3593 -- For non-packed arrays set the alignment of the array to the
3594 -- alignment of the component type if it is unknown. Skip this
3595 -- in atomic case (atomic arrays may need larger alignments).
3597 if not Is_Packed (E)
3598 and then Unknown_Alignment (E)
3599 and then Known_Alignment (Ctyp)
3600 and then Known_Static_Component_Size (E)
3601 and then Known_Static_Esize (Ctyp)
3602 and then Esize (Ctyp) = Component_Size (E)
3603 and then not Is_Atomic (E)
3605 Set_Alignment (E, Alignment (Component_Type (E)));
3609 -- For a class-wide type, the corresponding specific type is
3610 -- frozen as well (RM 13.14(15))
3612 elsif Is_Class_Wide_Type (E) then
3613 Freeze_And_Append (Root_Type (E), N, Result);
3615 -- If the base type of the class-wide type is still incomplete,
3616 -- the class-wide remains unfrozen as well. This is legal when
3617 -- E is the formal of a primitive operation of some other type
3618 -- which is being frozen.
3620 if not Is_Frozen (Root_Type (E)) then
3621 Set_Is_Frozen (E, False);
3625 -- If the Class_Wide_Type is an Itype (when type is the anonymous
3626 -- parent of a derived type) and it is a library-level entity,
3627 -- generate an itype reference for it. Otherwise, its first
3628 -- explicit reference may be in an inner scope, which will be
3629 -- rejected by the back-end.
3632 and then Is_Compilation_Unit (Scope (E))
3635 Ref : constant Node_Id := Make_Itype_Reference (Loc);
3639 Add_To_Result (Ref);
3643 -- The equivalent type associated with a class-wide subtype needs
3644 -- to be frozen to ensure that its layout is done.
3646 if Ekind (E) = E_Class_Wide_Subtype
3647 and then Present (Equivalent_Type (E))
3649 Freeze_And_Append (Equivalent_Type (E), N, Result);
3652 -- For a record (sub)type, freeze all the component types (RM
3653 -- 13.14(15). We test for E_Record_(sub)Type here, rather than using
3654 -- Is_Record_Type, because we don't want to attempt the freeze for
3655 -- the case of a private type with record extension (we will do that
3656 -- later when the full type is frozen).
3658 elsif Ekind (E) = E_Record_Type
3659 or else Ekind (E) = E_Record_Subtype
3661 Freeze_Record_Type (E);
3663 -- For a concurrent type, freeze corresponding record type. This
3664 -- does not correspond to any specific rule in the RM, but the
3665 -- record type is essentially part of the concurrent type.
3666 -- Freeze as well all local entities. This includes record types
3667 -- created for entry parameter blocks, and whatever local entities
3668 -- may appear in the private part.
3670 elsif Is_Concurrent_Type (E) then
3671 if Present (Corresponding_Record_Type (E)) then
3673 (Corresponding_Record_Type (E), N, Result);
3676 Comp := First_Entity (E);
3677 while Present (Comp) loop
3678 if Is_Type (Comp) then
3679 Freeze_And_Append (Comp, N, Result);
3681 elsif (Ekind (Comp)) /= E_Function then
3682 if Is_Itype (Etype (Comp))
3683 and then Underlying_Type (Scope (Etype (Comp))) = E
3685 Undelay_Type (Etype (Comp));
3688 Freeze_And_Append (Etype (Comp), N, Result);
3694 -- Private types are required to point to the same freeze node as
3695 -- their corresponding full views. The freeze node itself has to
3696 -- point to the partial view of the entity (because from the partial
3697 -- view, we can retrieve the full view, but not the reverse).
3698 -- However, in order to freeze correctly, we need to freeze the full
3699 -- view. If we are freezing at the end of a scope (or within the
3700 -- scope of the private type), the partial and full views will have
3701 -- been swapped, the full view appears first in the entity chain and
3702 -- the swapping mechanism ensures that the pointers are properly set
3705 -- If we encounter the partial view before the full view (e.g. when
3706 -- freezing from another scope), we freeze the full view, and then
3707 -- set the pointers appropriately since we cannot rely on swapping to
3708 -- fix things up (subtypes in an outer scope might not get swapped).
3710 elsif Is_Incomplete_Or_Private_Type (E)
3711 and then not Is_Generic_Type (E)
3713 -- The construction of the dispatch table associated with library
3714 -- level tagged types forces freezing of all the primitives of the
3715 -- type, which may cause premature freezing of the partial view.
3719 -- type T is tagged private;
3720 -- type DT is new T with private;
3721 -- procedure Prim (X : in out T; Y : in out DT'Class);
3723 -- type T is tagged null record;
3725 -- type DT is new T with null record;
3728 -- In this case the type will be frozen later by the usual
3729 -- mechanism: an object declaration, an instantiation, or the
3730 -- end of a declarative part.
3732 if Is_Library_Level_Tagged_Type (E)
3733 and then not Present (Full_View (E))
3735 Set_Is_Frozen (E, False);
3738 -- Case of full view present
3740 elsif Present (Full_View (E)) then
3742 -- If full view has already been frozen, then no further
3743 -- processing is required
3745 if Is_Frozen (Full_View (E)) then
3746 Set_Has_Delayed_Freeze (E, False);
3747 Set_Freeze_Node (E, Empty);
3748 Check_Debug_Info_Needed (E);
3750 -- Otherwise freeze full view and patch the pointers so that
3751 -- the freeze node will elaborate both views in the back-end.
3755 Full : constant Entity_Id := Full_View (E);
3758 if Is_Private_Type (Full)
3759 and then Present (Underlying_Full_View (Full))
3762 (Underlying_Full_View (Full), N, Result);
3765 Freeze_And_Append (Full, N, Result);
3767 if Has_Delayed_Freeze (E) then
3768 F_Node := Freeze_Node (Full);
3770 if Present (F_Node) then
3771 Set_Freeze_Node (E, F_Node);
3772 Set_Entity (F_Node, E);
3775 -- {Incomplete,Private}_Subtypes with Full_Views
3776 -- constrained by discriminants.
3778 Set_Has_Delayed_Freeze (E, False);
3779 Set_Freeze_Node (E, Empty);
3784 Check_Debug_Info_Needed (E);
3787 -- AI-117 requires that the convention of a partial view be the
3788 -- same as the convention of the full view. Note that this is a
3789 -- recognized breach of privacy, but it's essential for logical
3790 -- consistency of representation, and the lack of a rule in
3791 -- RM95 was an oversight.
3793 Set_Convention (E, Convention (Full_View (E)));
3795 Set_Size_Known_At_Compile_Time (E,
3796 Size_Known_At_Compile_Time (Full_View (E)));
3798 -- Size information is copied from the full view to the
3799 -- incomplete or private view for consistency.
3801 -- We skip this is the full view is not a type. This is very
3802 -- strange of course, and can only happen as a result of
3803 -- certain illegalities, such as a premature attempt to derive
3804 -- from an incomplete type.
3806 if Is_Type (Full_View (E)) then
3807 Set_Size_Info (E, Full_View (E));
3808 Set_RM_Size (E, RM_Size (Full_View (E)));
3813 -- Case of no full view present. If entity is derived or subtype,
3814 -- it is safe to freeze, correctness depends on the frozen status
3815 -- of parent. Otherwise it is either premature usage, or a Taft
3816 -- amendment type, so diagnosis is at the point of use and the
3817 -- type might be frozen later.
3819 elsif E /= Base_Type (E)
3820 or else Is_Derived_Type (E)
3825 Set_Is_Frozen (E, False);
3829 -- For access subprogram, freeze types of all formals, the return
3830 -- type was already frozen, since it is the Etype of the function.
3831 -- Formal types can be tagged Taft amendment types, but otherwise
3832 -- they cannot be incomplete.
3834 elsif Ekind (E) = E_Subprogram_Type then
3835 Formal := First_Formal (E);
3836 while Present (Formal) loop
3837 if Ekind (Etype (Formal)) = E_Incomplete_Type
3838 and then No (Full_View (Etype (Formal)))
3839 and then not Is_Value_Type (Etype (Formal))
3841 if Is_Tagged_Type (Etype (Formal)) then
3844 -- AI05-151: Incomplete types are allowed in access to
3845 -- subprogram specifications.
3847 elsif Ada_Version < Ada_2012 then
3849 ("invalid use of incomplete type&", E, Etype (Formal));
3853 Freeze_And_Append (Etype (Formal), N, Result);
3854 Next_Formal (Formal);
3857 Freeze_Subprogram (E);
3859 -- For access to a protected subprogram, freeze the equivalent type
3860 -- (however this is not set if we are not generating code or if this
3861 -- is an anonymous type used just for resolution).
3863 elsif Is_Access_Protected_Subprogram_Type (E) then
3864 if Present (Equivalent_Type (E)) then
3865 Freeze_And_Append (Equivalent_Type (E), N, Result);
3869 -- Generic types are never seen by the back-end, and are also not
3870 -- processed by the expander (since the expander is turned off for
3871 -- generic processing), so we never need freeze nodes for them.
3873 if Is_Generic_Type (E) then
3877 -- Some special processing for non-generic types to complete
3878 -- representation details not known till the freeze point.
3880 if Is_Fixed_Point_Type (E) then
3881 Freeze_Fixed_Point_Type (E);
3883 -- Some error checks required for ordinary fixed-point type. Defer
3884 -- these till the freeze-point since we need the small and range
3885 -- values. We only do these checks for base types
3887 if Is_Ordinary_Fixed_Point_Type (E) and then Is_Base_Type (E) then
3888 if Small_Value (E) < Ureal_2_M_80 then
3889 Error_Msg_Name_1 := Name_Small;
3891 ("`&''%` too small, minimum allowed is 2.0'*'*(-80)", E);
3893 elsif Small_Value (E) > Ureal_2_80 then
3894 Error_Msg_Name_1 := Name_Small;
3896 ("`&''%` too large, maximum allowed is 2.0'*'*80", E);
3899 if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then
3900 Error_Msg_Name_1 := Name_First;
3902 ("`&''%` too small, minimum allowed is -10.0'*'*36", E);
3905 if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then
3906 Error_Msg_Name_1 := Name_Last;
3908 ("`&''%` too large, maximum allowed is 10.0'*'*36", E);
3912 elsif Is_Enumeration_Type (E) then
3913 Freeze_Enumeration_Type (E);
3915 elsif Is_Integer_Type (E) then
3916 Adjust_Esize_For_Alignment (E);
3918 if Is_Modular_Integer_Type (E)
3919 and then Warn_On_Suspicious_Modulus_Value
3921 Check_Suspicious_Modulus (E);
3924 elsif Is_Access_Type (E) then
3926 -- If a pragma Default_Storage_Pool applies, and this type has no
3927 -- Storage_Pool or Storage_Size clause (which must have occurred
3928 -- before the freezing point), then use the default. This applies
3929 -- only to base types.
3931 if Present (Default_Pool)
3932 and then Is_Base_Type (E)
3933 and then not Has_Storage_Size_Clause (E)
3934 and then No (Associated_Storage_Pool (E))
3936 -- Case of pragma Default_Storage_Pool (null)
3938 if Nkind (Default_Pool) = N_Null then
3939 Set_No_Pool_Assigned (E);
3941 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
3944 Set_Associated_Storage_Pool (E, Entity (Default_Pool));
3948 -- Check restriction for standard storage pool
3950 if No (Associated_Storage_Pool (E)) then
3951 Check_Restriction (No_Standard_Storage_Pools, E);
3954 -- Deal with error message for pure access type. This is not an
3955 -- error in Ada 2005 if there is no pool (see AI-366).
3957 if Is_Pure_Unit_Access_Type (E)
3958 and then (Ada_Version < Ada_2005
3959 or else not No_Pool_Assigned (E))
3961 Error_Msg_N ("named access type not allowed in pure unit", E);
3963 if Ada_Version >= Ada_2005 then
3965 ("\would be legal if Storage_Size of 0 given?", E);
3967 elsif No_Pool_Assigned (E) then
3969 ("\would be legal in Ada 2005?", E);
3973 ("\would be legal in Ada 2005 if "
3974 & "Storage_Size of 0 given?", E);
3979 -- Case of composite types
3981 if Is_Composite_Type (E) then
3983 -- AI-117 requires that all new primitives of a tagged type must
3984 -- inherit the convention of the full view of the type. Inherited
3985 -- and overriding operations are defined to inherit the convention
3986 -- of their parent or overridden subprogram (also specified in
3987 -- AI-117), which will have occurred earlier (in Derive_Subprogram
3988 -- and New_Overloaded_Entity). Here we set the convention of
3989 -- primitives that are still convention Ada, which will ensure
3990 -- that any new primitives inherit the type's convention. Class-
3991 -- wide types can have a foreign convention inherited from their
3992 -- specific type, but are excluded from this since they don't have
3993 -- any associated primitives.
3995 if Is_Tagged_Type (E)
3996 and then not Is_Class_Wide_Type (E)
3997 and then Convention (E) /= Convention_Ada
4000 Prim_List : constant Elist_Id := Primitive_Operations (E);
4004 Prim := First_Elmt (Prim_List);
4005 while Present (Prim) loop
4006 if Convention (Node (Prim)) = Convention_Ada then
4007 Set_Convention (Node (Prim), Convention (E));
4016 -- Now that all types from which E may depend are frozen, see if the
4017 -- size is known at compile time, if it must be unsigned, or if
4018 -- strict alignment is required
4020 Check_Compile_Time_Size (E);
4021 Check_Unsigned_Type (E);
4023 if Base_Type (E) = E then
4024 Check_Strict_Alignment (E);
4027 -- Do not allow a size clause for a type which does not have a size
4028 -- that is known at compile time
4030 if Has_Size_Clause (E)
4031 and then not Size_Known_At_Compile_Time (E)
4033 -- Suppress this message if errors posted on E, even if we are
4034 -- in all errors mode, since this is often a junk message
4036 if not Error_Posted (E) then
4038 ("size clause not allowed for variable length type",
4043 -- Now we set/verify the representation information, in particular
4044 -- the size and alignment values. This processing is not required for
4045 -- generic types, since generic types do not play any part in code
4046 -- generation, and so the size and alignment values for such types
4049 if Is_Generic_Type (E) then
4052 -- Otherwise we call the layout procedure
4058 -- If the type has a Defaut_Value/Default_Component_Value aspect,
4059 -- this is where we analye the expression (after the type is frozen,
4060 -- since in the case of Default_Value, we are analyzing with the
4061 -- type itself, and we treat Default_Component_Value similarly for
4062 -- the sake of uniformity.
4064 if Is_First_Subtype (E) and then Has_Default_Aspect (E) then
4072 if Is_Scalar_Type (E) then
4073 Nam := Name_Default_Value;
4076 Nam := Name_Default_Component_Value;
4077 Typ := Component_Type (E);
4080 Aspect := Get_Rep_Item_For_Entity (E, Nam);
4081 Exp := Expression (Aspect);
4082 Analyze_And_Resolve (Exp, Typ);
4084 if Etype (Exp) /= Any_Type then
4085 if not Is_Static_Expression (Exp) then
4086 Error_Msg_Name_1 := Nam;
4087 Flag_Non_Static_Expr
4088 ("aspect% requires static expression", Exp);
4094 -- End of freeze processing for type entities
4097 -- Here is where we logically freeze the current entity. If it has a
4098 -- freeze node, then this is the point at which the freeze node is
4099 -- linked into the result list.
4101 if Has_Delayed_Freeze (E) then
4103 -- If a freeze node is already allocated, use it, otherwise allocate
4104 -- a new one. The preallocation happens in the case of anonymous base
4105 -- types, where we preallocate so that we can set First_Subtype_Link.
4106 -- Note that we reset the Sloc to the current freeze location.
4108 if Present (Freeze_Node (E)) then
4109 F_Node := Freeze_Node (E);
4110 Set_Sloc (F_Node, Loc);
4113 F_Node := New_Node (N_Freeze_Entity, Loc);
4114 Set_Freeze_Node (E, F_Node);
4115 Set_Access_Types_To_Process (F_Node, No_Elist);
4116 Set_TSS_Elist (F_Node, No_Elist);
4117 Set_Actions (F_Node, No_List);
4120 Set_Entity (F_Node, E);
4121 Add_To_Result (F_Node);
4123 -- A final pass over record types with discriminants. If the type
4124 -- has an incomplete declaration, there may be constrained access
4125 -- subtypes declared elsewhere, which do not depend on the discrimi-
4126 -- nants of the type, and which are used as component types (i.e.
4127 -- the full view is a recursive type). The designated types of these
4128 -- subtypes can only be elaborated after the type itself, and they
4129 -- need an itype reference.
4131 if Ekind (E) = E_Record_Type
4132 and then Has_Discriminants (E)
4140 Comp := First_Component (E);
4141 while Present (Comp) loop
4142 Typ := Etype (Comp);
4144 if Ekind (Comp) = E_Component
4145 and then Is_Access_Type (Typ)
4146 and then Scope (Typ) /= E
4147 and then Base_Type (Designated_Type (Typ)) = E
4148 and then Is_Itype (Designated_Type (Typ))
4150 IR := Make_Itype_Reference (Sloc (Comp));
4151 Set_Itype (IR, Designated_Type (Typ));
4152 Append (IR, Result);
4155 Next_Component (Comp);
4161 -- When a type is frozen, the first subtype of the type is frozen as
4162 -- well (RM 13.14(15)). This has to be done after freezing the type,
4163 -- since obviously the first subtype depends on its own base type.
4166 Freeze_And_Append (First_Subtype (E), N, Result);
4168 -- If we just froze a tagged non-class wide record, then freeze the
4169 -- corresponding class-wide type. This must be done after the tagged
4170 -- type itself is frozen, because the class-wide type refers to the
4171 -- tagged type which generates the class.
4173 if Is_Tagged_Type (E)
4174 and then not Is_Class_Wide_Type (E)
4175 and then Present (Class_Wide_Type (E))
4177 Freeze_And_Append (Class_Wide_Type (E), N, Result);
4181 Check_Debug_Info_Needed (E);
4183 -- Special handling for subprograms
4185 if Is_Subprogram (E) then
4187 -- If subprogram has address clause then reset Is_Public flag, since
4188 -- we do not want the backend to generate external references.
4190 if Present (Address_Clause (E))
4191 and then not Is_Library_Level_Entity (E)
4193 Set_Is_Public (E, False);
4195 -- If no address clause and not intrinsic, then for imported
4196 -- subprogram in main unit, generate descriptor if we are in
4197 -- Propagate_Exceptions mode.
4199 -- This is very odd code, it makes a null result, why ???
4201 elsif Propagate_Exceptions
4202 and then Is_Imported (E)
4203 and then not Is_Intrinsic_Subprogram (E)
4204 and then Convention (E) /= Convention_Stubbed
4206 if Result = No_List then
4207 Result := Empty_List;
4215 -----------------------------
4216 -- Freeze_Enumeration_Type --
4217 -----------------------------
4219 procedure Freeze_Enumeration_Type (Typ : Entity_Id) is
4221 -- By default, if no size clause is present, an enumeration type with
4222 -- Convention C is assumed to interface to a C enum, and has integer
4223 -- size. This applies to types. For subtypes, verify that its base
4224 -- type has no size clause either.
4226 if Has_Foreign_Convention (Typ)
4227 and then not Has_Size_Clause (Typ)
4228 and then not Has_Size_Clause (Base_Type (Typ))
4229 and then Esize (Typ) < Standard_Integer_Size
4231 Init_Esize (Typ, Standard_Integer_Size);
4234 -- If the enumeration type interfaces to C, and it has a size clause
4235 -- that specifies less than int size, it warrants a warning. The
4236 -- user may intend the C type to be an enum or a char, so this is
4237 -- not by itself an error that the Ada compiler can detect, but it
4238 -- it is a worth a heads-up. For Boolean and Character types we
4239 -- assume that the programmer has the proper C type in mind.
4241 if Convention (Typ) = Convention_C
4242 and then Has_Size_Clause (Typ)
4243 and then Esize (Typ) /= Esize (Standard_Integer)
4244 and then not Is_Boolean_Type (Typ)
4245 and then not Is_Character_Type (Typ)
4248 ("C enum types have the size of a C int?", Size_Clause (Typ));
4251 Adjust_Esize_For_Alignment (Typ);
4253 end Freeze_Enumeration_Type;
4255 -----------------------
4256 -- Freeze_Expression --
4257 -----------------------
4259 procedure Freeze_Expression (N : Node_Id) is
4260 In_Spec_Exp : constant Boolean := In_Spec_Expression;
4263 Desig_Typ : Entity_Id;
4267 Freeze_Outside : Boolean := False;
4268 -- This flag is set true if the entity must be frozen outside the
4269 -- current subprogram. This happens in the case of expander generated
4270 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
4271 -- not freeze all entities like other bodies, but which nevertheless
4272 -- may reference entities that have to be frozen before the body and
4273 -- obviously cannot be frozen inside the body.
4275 function In_Exp_Body (N : Node_Id) return Boolean;
4276 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
4277 -- it is the handled statement sequence of an expander-generated
4278 -- subprogram (init proc, stream subprogram, or renaming as body).
4279 -- If so, this is not a freezing context.
4285 function In_Exp_Body (N : Node_Id) return Boolean is
4290 if Nkind (N) = N_Subprogram_Body then
4296 if Nkind (P) /= N_Subprogram_Body then
4300 Id := Defining_Unit_Name (Specification (P));
4302 if Nkind (Id) = N_Defining_Identifier
4303 and then (Is_Init_Proc (Id) or else
4304 Is_TSS (Id, TSS_Stream_Input) or else
4305 Is_TSS (Id, TSS_Stream_Output) or else
4306 Is_TSS (Id, TSS_Stream_Read) or else
4307 Is_TSS (Id, TSS_Stream_Write) or else
4308 Nkind (Original_Node (P)) =
4309 N_Subprogram_Renaming_Declaration)
4318 -- Start of processing for Freeze_Expression
4321 -- Immediate return if freezing is inhibited. This flag is set by the
4322 -- analyzer to stop freezing on generated expressions that would cause
4323 -- freezing if they were in the source program, but which are not
4324 -- supposed to freeze, since they are created.
4326 if Must_Not_Freeze (N) then
4330 -- If expression is non-static, then it does not freeze in a default
4331 -- expression, see section "Handling of Default Expressions" in the
4332 -- spec of package Sem for further details. Note that we have to
4333 -- make sure that we actually have a real expression (if we have
4334 -- a subtype indication, we can't test Is_Static_Expression!)
4337 and then Nkind (N) in N_Subexpr
4338 and then not Is_Static_Expression (N)
4343 -- Freeze type of expression if not frozen already
4347 if Nkind (N) in N_Has_Etype then
4348 if not Is_Frozen (Etype (N)) then
4351 -- Base type may be an derived numeric type that is frozen at
4352 -- the point of declaration, but first_subtype is still unfrozen.
4354 elsif not Is_Frozen (First_Subtype (Etype (N))) then
4355 Typ := First_Subtype (Etype (N));
4359 -- For entity name, freeze entity if not frozen already. A special
4360 -- exception occurs for an identifier that did not come from source.
4361 -- We don't let such identifiers freeze a non-internal entity, i.e.
4362 -- an entity that did come from source, since such an identifier was
4363 -- generated by the expander, and cannot have any semantic effect on
4364 -- the freezing semantics. For example, this stops the parameter of
4365 -- an initialization procedure from freezing the variable.
4367 if Is_Entity_Name (N)
4368 and then not Is_Frozen (Entity (N))
4369 and then (Nkind (N) /= N_Identifier
4370 or else Comes_From_Source (N)
4371 or else not Comes_From_Source (Entity (N)))
4378 -- For an allocator freeze designated type if not frozen already
4380 -- For an aggregate whose component type is an access type, freeze the
4381 -- designated type now, so that its freeze does not appear within the
4382 -- loop that might be created in the expansion of the aggregate. If the
4383 -- designated type is a private type without full view, the expression
4384 -- cannot contain an allocator, so the type is not frozen.
4386 -- For a function, we freeze the entity when the subprogram declaration
4387 -- is frozen, but a function call may appear in an initialization proc.
4388 -- before the declaration is frozen. We need to generate the extra
4389 -- formals, if any, to ensure that the expansion of the call includes
4390 -- the proper actuals. This only applies to Ada subprograms, not to
4397 Desig_Typ := Designated_Type (Etype (N));
4400 if Is_Array_Type (Etype (N))
4401 and then Is_Access_Type (Component_Type (Etype (N)))
4403 Desig_Typ := Designated_Type (Component_Type (Etype (N)));
4406 when N_Selected_Component |
4407 N_Indexed_Component |
4410 if Is_Access_Type (Etype (Prefix (N))) then
4411 Desig_Typ := Designated_Type (Etype (Prefix (N)));
4414 when N_Identifier =>
4416 and then Ekind (Nam) = E_Function
4417 and then Nkind (Parent (N)) = N_Function_Call
4418 and then Convention (Nam) = Convention_Ada
4420 Create_Extra_Formals (Nam);
4427 if Desig_Typ /= Empty
4428 and then (Is_Frozen (Desig_Typ)
4429 or else (not Is_Fully_Defined (Desig_Typ)))
4434 -- All done if nothing needs freezing
4438 and then No (Desig_Typ)
4443 -- Loop for looking at the right place to insert the freeze nodes,
4444 -- exiting from the loop when it is appropriate to insert the freeze
4445 -- node before the current node P.
4447 -- Also checks some special exceptions to the freezing rules. These
4448 -- cases result in a direct return, bypassing the freeze action.
4452 Parent_P := Parent (P);
4454 -- If we don't have a parent, then we are not in a well-formed tree.
4455 -- This is an unusual case, but there are some legitimate situations
4456 -- in which this occurs, notably when the expressions in the range of
4457 -- a type declaration are resolved. We simply ignore the freeze
4458 -- request in this case. Is this right ???
4460 if No (Parent_P) then
4464 -- See if we have got to an appropriate point in the tree
4466 case Nkind (Parent_P) is
4468 -- A special test for the exception of (RM 13.14(8)) for the case
4469 -- of per-object expressions (RM 3.8(18)) occurring in component
4470 -- definition or a discrete subtype definition. Note that we test
4471 -- for a component declaration which includes both cases we are
4472 -- interested in, and furthermore the tree does not have explicit
4473 -- nodes for either of these two constructs.
4475 when N_Component_Declaration =>
4477 -- The case we want to test for here is an identifier that is
4478 -- a per-object expression, this is either a discriminant that
4479 -- appears in a context other than the component declaration
4480 -- or it is a reference to the type of the enclosing construct.
4482 -- For either of these cases, we skip the freezing
4484 if not In_Spec_Expression
4485 and then Nkind (N) = N_Identifier
4486 and then (Present (Entity (N)))
4488 -- We recognize the discriminant case by just looking for
4489 -- a reference to a discriminant. It can only be one for
4490 -- the enclosing construct. Skip freezing in this case.
4492 if Ekind (Entity (N)) = E_Discriminant then
4495 -- For the case of a reference to the enclosing record,
4496 -- (or task or protected type), we look for a type that
4497 -- matches the current scope.
4499 elsif Entity (N) = Current_Scope then
4504 -- If we have an enumeration literal that appears as the choice in
4505 -- the aggregate of an enumeration representation clause, then
4506 -- freezing does not occur (RM 13.14(10)).
4508 when N_Enumeration_Representation_Clause =>
4510 -- The case we are looking for is an enumeration literal
4512 if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal)
4513 and then Is_Enumeration_Type (Etype (N))
4515 -- If enumeration literal appears directly as the choice,
4516 -- do not freeze (this is the normal non-overloaded case)
4518 if Nkind (Parent (N)) = N_Component_Association
4519 and then First (Choices (Parent (N))) = N
4523 -- If enumeration literal appears as the name of function
4524 -- which is the choice, then also do not freeze. This
4525 -- happens in the overloaded literal case, where the
4526 -- enumeration literal is temporarily changed to a function
4527 -- call for overloading analysis purposes.
4529 elsif Nkind (Parent (N)) = N_Function_Call
4531 Nkind (Parent (Parent (N))) = N_Component_Association
4533 First (Choices (Parent (Parent (N)))) = Parent (N)
4539 -- Normally if the parent is a handled sequence of statements,
4540 -- then the current node must be a statement, and that is an
4541 -- appropriate place to insert a freeze node.
4543 when N_Handled_Sequence_Of_Statements =>
4545 -- An exception occurs when the sequence of statements is for
4546 -- an expander generated body that did not do the usual freeze
4547 -- all operation. In this case we usually want to freeze
4548 -- outside this body, not inside it, and we skip past the
4549 -- subprogram body that we are inside.
4551 if In_Exp_Body (Parent_P) then
4553 -- However, we *do* want to freeze at this point if we have
4554 -- an entity to freeze, and that entity is declared *inside*
4555 -- the body of the expander generated procedure. This case
4556 -- is recognized by the scope of the type, which is either
4557 -- the spec for some enclosing body, or (in the case of
4558 -- init_procs, for which there are no separate specs) the
4562 Subp : constant Node_Id := Parent (Parent_P);
4566 if Nkind (Subp) = N_Subprogram_Body then
4567 Cspc := Corresponding_Spec (Subp);
4569 if (Present (Typ) and then Scope (Typ) = Cspc)
4571 (Present (Nam) and then Scope (Nam) = Cspc)
4576 and then Scope (Typ) = Current_Scope
4577 and then Current_Scope = Defining_Entity (Subp)
4584 -- If not that exception to the exception, then this is
4585 -- where we delay the freeze till outside the body.
4587 Parent_P := Parent (Parent_P);
4588 Freeze_Outside := True;
4590 -- Here if normal case where we are in handled statement
4591 -- sequence and want to do the insertion right there.
4597 -- If parent is a body or a spec or a block, then the current node
4598 -- is a statement or declaration and we can insert the freeze node
4601 when N_Block_Statement |
4604 N_Package_Specification |
4607 N_Task_Body => exit;
4609 -- The expander is allowed to define types in any statements list,
4610 -- so any of the following parent nodes also mark a freezing point
4611 -- if the actual node is in a list of statements or declarations.
4613 when N_Abortable_Part |
4614 N_Accept_Alternative |
4616 N_Case_Statement_Alternative |
4617 N_Compilation_Unit_Aux |
4618 N_Conditional_Entry_Call |
4619 N_Delay_Alternative |
4621 N_Entry_Call_Alternative |
4622 N_Exception_Handler |
4623 N_Extended_Return_Statement |
4627 N_Selective_Accept |
4628 N_Triggering_Alternative =>
4630 exit when Is_List_Member (P);
4632 -- Note: The N_Loop_Statement is a special case. A type that
4633 -- appears in the source can never be frozen in a loop (this
4634 -- occurs only because of a loop expanded by the expander), so we
4635 -- keep on going. Otherwise we terminate the search. Same is true
4636 -- of any entity which comes from source. (if they have predefined
4637 -- type, that type does not appear to come from source, but the
4638 -- entity should not be frozen here).
4640 when N_Loop_Statement =>
4641 exit when not Comes_From_Source (Etype (N))
4642 and then (No (Nam) or else not Comes_From_Source (Nam));
4644 -- For all other cases, keep looking at parents
4650 -- We fall through the case if we did not yet find the proper
4651 -- place in the free for inserting the freeze node, so climb!
4656 -- If the expression appears in a record or an initialization procedure,
4657 -- the freeze nodes are collected and attached to the current scope, to
4658 -- be inserted and analyzed on exit from the scope, to insure that
4659 -- generated entities appear in the correct scope. If the expression is
4660 -- a default for a discriminant specification, the scope is still void.
4661 -- The expression can also appear in the discriminant part of a private
4662 -- or concurrent type.
4664 -- If the expression appears in a constrained subcomponent of an
4665 -- enclosing record declaration, the freeze nodes must be attached to
4666 -- the outer record type so they can eventually be placed in the
4667 -- enclosing declaration list.
4669 -- The other case requiring this special handling is if we are in a
4670 -- default expression, since in that case we are about to freeze a
4671 -- static type, and the freeze scope needs to be the outer scope, not
4672 -- the scope of the subprogram with the default parameter.
4674 -- For default expressions and other spec expressions in generic units,
4675 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
4676 -- placing them at the proper place, after the generic unit.
4678 if (In_Spec_Exp and not Inside_A_Generic)
4679 or else Freeze_Outside
4680 or else (Is_Type (Current_Scope)
4681 and then (not Is_Concurrent_Type (Current_Scope)
4682 or else not Has_Completion (Current_Scope)))
4683 or else Ekind (Current_Scope) = E_Void
4686 N : constant Node_Id := Current_Scope;
4687 Freeze_Nodes : List_Id := No_List;
4688 Pos : Int := Scope_Stack.Last;
4691 if Present (Desig_Typ) then
4692 Freeze_And_Append (Desig_Typ, N, Freeze_Nodes);
4695 if Present (Typ) then
4696 Freeze_And_Append (Typ, N, Freeze_Nodes);
4699 if Present (Nam) then
4700 Freeze_And_Append (Nam, N, Freeze_Nodes);
4703 -- The current scope may be that of a constrained component of
4704 -- an enclosing record declaration, which is above the current
4705 -- scope in the scope stack.
4706 -- If the expression is within a top-level pragma, as for a pre-
4707 -- condition on a library-level subprogram, nothing to do.
4709 if not Is_Compilation_Unit (Current_Scope)
4710 and then Is_Record_Type (Scope (Current_Scope))
4715 if Is_Non_Empty_List (Freeze_Nodes) then
4716 if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then
4717 Scope_Stack.Table (Pos).Pending_Freeze_Actions :=
4720 Append_List (Freeze_Nodes,
4721 Scope_Stack.Table (Pos).Pending_Freeze_Actions);
4729 -- Now we have the right place to do the freezing. First, a special
4730 -- adjustment, if we are in spec-expression analysis mode, these freeze
4731 -- actions must not be thrown away (normally all inserted actions are
4732 -- thrown away in this mode. However, the freeze actions are from static
4733 -- expressions and one of the important reasons we are doing this
4734 -- special analysis is to get these freeze actions. Therefore we turn
4735 -- off the In_Spec_Expression mode to propagate these freeze actions.
4736 -- This also means they get properly analyzed and expanded.
4738 In_Spec_Expression := False;
4740 -- Freeze the designated type of an allocator (RM 13.14(13))
4742 if Present (Desig_Typ) then
4743 Freeze_Before (P, Desig_Typ);
4746 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
4747 -- the enumeration representation clause exception in the loop above.
4749 if Present (Typ) then
4750 Freeze_Before (P, Typ);
4753 -- Freeze name if one is present (RM 13.14(11))
4755 if Present (Nam) then
4756 Freeze_Before (P, Nam);
4759 -- Restore In_Spec_Expression flag
4761 In_Spec_Expression := In_Spec_Exp;
4762 end Freeze_Expression;
4764 -----------------------------
4765 -- Freeze_Fixed_Point_Type --
4766 -----------------------------
4768 -- Certain fixed-point types and subtypes, including implicit base types
4769 -- and declared first subtypes, have not yet set up a range. This is
4770 -- because the range cannot be set until the Small and Size values are
4771 -- known, and these are not known till the type is frozen.
4773 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
4774 -- whose bounds are unanalyzed real literals. This routine will recognize
4775 -- this case, and transform this range node into a properly typed range
4776 -- with properly analyzed and resolved values.
4778 procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is
4779 Rng : constant Node_Id := Scalar_Range (Typ);
4780 Lo : constant Node_Id := Low_Bound (Rng);
4781 Hi : constant Node_Id := High_Bound (Rng);
4782 Btyp : constant Entity_Id := Base_Type (Typ);
4783 Brng : constant Node_Id := Scalar_Range (Btyp);
4784 BLo : constant Node_Id := Low_Bound (Brng);
4785 BHi : constant Node_Id := High_Bound (Brng);
4786 Small : constant Ureal := Small_Value (Typ);
4793 function Fsize (Lov, Hiv : Ureal) return Nat;
4794 -- Returns size of type with given bounds. Also leaves these
4795 -- bounds set as the current bounds of the Typ.
4801 function Fsize (Lov, Hiv : Ureal) return Nat is
4803 Set_Realval (Lo, Lov);
4804 Set_Realval (Hi, Hiv);
4805 return Minimum_Size (Typ);
4808 -- Start of processing for Freeze_Fixed_Point_Type
4811 -- If Esize of a subtype has not previously been set, set it now
4813 if Unknown_Esize (Typ) then
4814 Atype := Ancestor_Subtype (Typ);
4816 if Present (Atype) then
4817 Set_Esize (Typ, Esize (Atype));
4819 Set_Esize (Typ, Esize (Base_Type (Typ)));
4823 -- Immediate return if the range is already analyzed. This means that
4824 -- the range is already set, and does not need to be computed by this
4827 if Analyzed (Rng) then
4831 -- Immediate return if either of the bounds raises Constraint_Error
4833 if Raises_Constraint_Error (Lo)
4834 or else Raises_Constraint_Error (Hi)
4839 Loval := Realval (Lo);
4840 Hival := Realval (Hi);
4842 -- Ordinary fixed-point case
4844 if Is_Ordinary_Fixed_Point_Type (Typ) then
4846 -- For the ordinary fixed-point case, we are allowed to fudge the
4847 -- end-points up or down by small. Generally we prefer to fudge up,
4848 -- i.e. widen the bounds for non-model numbers so that the end points
4849 -- are included. However there are cases in which this cannot be
4850 -- done, and indeed cases in which we may need to narrow the bounds.
4851 -- The following circuit makes the decision.
4853 -- Note: our terminology here is that Incl_EP means that the bounds
4854 -- are widened by Small if necessary to include the end points, and
4855 -- Excl_EP means that the bounds are narrowed by Small to exclude the
4856 -- end-points if this reduces the size.
4858 -- Note that in the Incl case, all we care about is including the
4859 -- end-points. In the Excl case, we want to narrow the bounds as
4860 -- much as permitted by the RM, to give the smallest possible size.
4863 Loval_Incl_EP : Ureal;
4864 Hival_Incl_EP : Ureal;
4866 Loval_Excl_EP : Ureal;
4867 Hival_Excl_EP : Ureal;
4873 First_Subt : Entity_Id;
4878 -- First step. Base types are required to be symmetrical. Right
4879 -- now, the base type range is a copy of the first subtype range.
4880 -- This will be corrected before we are done, but right away we
4881 -- need to deal with the case where both bounds are non-negative.
4882 -- In this case, we set the low bound to the negative of the high
4883 -- bound, to make sure that the size is computed to include the
4884 -- required sign. Note that we do not need to worry about the
4885 -- case of both bounds negative, because the sign will be dealt
4886 -- with anyway. Furthermore we can't just go making such a bound
4887 -- symmetrical, since in a twos-complement system, there is an
4888 -- extra negative value which could not be accommodated on the
4892 and then not UR_Is_Negative (Loval)
4893 and then Hival > Loval
4896 Set_Realval (Lo, Loval);
4899 -- Compute the fudged bounds. If the number is a model number,
4900 -- then we do nothing to include it, but we are allowed to backoff
4901 -- to the next adjacent model number when we exclude it. If it is
4902 -- not a model number then we straddle the two values with the
4903 -- model numbers on either side.
4905 Model_Num := UR_Trunc (Loval / Small) * Small;
4907 if Loval = Model_Num then
4908 Loval_Incl_EP := Model_Num;
4910 Loval_Incl_EP := Model_Num - Small;
4913 -- The low value excluding the end point is Small greater, but
4914 -- we do not do this exclusion if the low value is positive,
4915 -- since it can't help the size and could actually hurt by
4916 -- crossing the high bound.
4918 if UR_Is_Negative (Loval_Incl_EP) then
4919 Loval_Excl_EP := Loval_Incl_EP + Small;
4921 -- If the value went from negative to zero, then we have the
4922 -- case where Loval_Incl_EP is the model number just below
4923 -- zero, so we want to stick to the negative value for the
4924 -- base type to maintain the condition that the size will
4925 -- include signed values.
4928 and then UR_Is_Zero (Loval_Excl_EP)
4930 Loval_Excl_EP := Loval_Incl_EP;
4934 Loval_Excl_EP := Loval_Incl_EP;
4937 -- Similar processing for upper bound and high value
4939 Model_Num := UR_Trunc (Hival / Small) * Small;
4941 if Hival = Model_Num then
4942 Hival_Incl_EP := Model_Num;
4944 Hival_Incl_EP := Model_Num + Small;
4947 if UR_Is_Positive (Hival_Incl_EP) then
4948 Hival_Excl_EP := Hival_Incl_EP - Small;
4950 Hival_Excl_EP := Hival_Incl_EP;
4953 -- One further adjustment is needed. In the case of subtypes, we
4954 -- cannot go outside the range of the base type, or we get
4955 -- peculiarities, and the base type range is already set. This
4956 -- only applies to the Incl values, since clearly the Excl values
4957 -- are already as restricted as they are allowed to be.
4960 Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo));
4961 Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi));
4964 -- Get size including and excluding end points
4966 Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP);
4967 Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP);
4969 -- No need to exclude end-points if it does not reduce size
4971 if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then
4972 Loval_Excl_EP := Loval_Incl_EP;
4975 if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then
4976 Hival_Excl_EP := Hival_Incl_EP;
4979 -- Now we set the actual size to be used. We want to use the
4980 -- bounds fudged up to include the end-points but only if this
4981 -- can be done without violating a specifically given size
4982 -- size clause or causing an unacceptable increase in size.
4984 -- Case of size clause given
4986 if Has_Size_Clause (Typ) then
4988 -- Use the inclusive size only if it is consistent with
4989 -- the explicitly specified size.
4991 if Size_Incl_EP <= RM_Size (Typ) then
4992 Actual_Lo := Loval_Incl_EP;
4993 Actual_Hi := Hival_Incl_EP;
4994 Actual_Size := Size_Incl_EP;
4996 -- If the inclusive size is too large, we try excluding
4997 -- the end-points (will be caught later if does not work).
5000 Actual_Lo := Loval_Excl_EP;
5001 Actual_Hi := Hival_Excl_EP;
5002 Actual_Size := Size_Excl_EP;
5005 -- Case of size clause not given
5008 -- If we have a base type whose corresponding first subtype
5009 -- has an explicit size that is large enough to include our
5010 -- end-points, then do so. There is no point in working hard
5011 -- to get a base type whose size is smaller than the specified
5012 -- size of the first subtype.
5014 First_Subt := First_Subtype (Typ);
5016 if Has_Size_Clause (First_Subt)
5017 and then Size_Incl_EP <= Esize (First_Subt)
5019 Actual_Size := Size_Incl_EP;
5020 Actual_Lo := Loval_Incl_EP;
5021 Actual_Hi := Hival_Incl_EP;
5023 -- If excluding the end-points makes the size smaller and
5024 -- results in a size of 8,16,32,64, then we take the smaller
5025 -- size. For the 64 case, this is compulsory. For the other
5026 -- cases, it seems reasonable. We like to include end points
5027 -- if we can, but not at the expense of moving to the next
5028 -- natural boundary of size.
5030 elsif Size_Incl_EP /= Size_Excl_EP
5031 and then Addressable (Size_Excl_EP)
5033 Actual_Size := Size_Excl_EP;
5034 Actual_Lo := Loval_Excl_EP;
5035 Actual_Hi := Hival_Excl_EP;
5037 -- Otherwise we can definitely include the end points
5040 Actual_Size := Size_Incl_EP;
5041 Actual_Lo := Loval_Incl_EP;
5042 Actual_Hi := Hival_Incl_EP;
5045 -- One pathological case: normally we never fudge a low bound
5046 -- down, since it would seem to increase the size (if it has
5047 -- any effect), but for ranges containing single value, or no
5048 -- values, the high bound can be small too large. Consider:
5050 -- type t is delta 2.0**(-14)
5051 -- range 131072.0 .. 0;
5053 -- That lower bound is *just* outside the range of 32 bits, and
5054 -- does need fudging down in this case. Note that the bounds
5055 -- will always have crossed here, since the high bound will be
5056 -- fudged down if necessary, as in the case of:
5058 -- type t is delta 2.0**(-14)
5059 -- range 131072.0 .. 131072.0;
5061 -- So we detect the situation by looking for crossed bounds,
5062 -- and if the bounds are crossed, and the low bound is greater
5063 -- than zero, we will always back it off by small, since this
5064 -- is completely harmless.
5066 if Actual_Lo > Actual_Hi then
5067 if UR_Is_Positive (Actual_Lo) then
5068 Actual_Lo := Loval_Incl_EP - Small;
5069 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5071 -- And of course, we need to do exactly the same parallel
5072 -- fudge for flat ranges in the negative region.
5074 elsif UR_Is_Negative (Actual_Hi) then
5075 Actual_Hi := Hival_Incl_EP + Small;
5076 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5081 Set_Realval (Lo, Actual_Lo);
5082 Set_Realval (Hi, Actual_Hi);
5085 -- For the decimal case, none of this fudging is required, since there
5086 -- are no end-point problems in the decimal case (the end-points are
5087 -- always included).
5090 Actual_Size := Fsize (Loval, Hival);
5093 -- At this stage, the actual size has been calculated and the proper
5094 -- required bounds are stored in the low and high bounds.
5096 if Actual_Size > 64 then
5097 Error_Msg_Uint_1 := UI_From_Int (Actual_Size);
5099 ("size required (^) for type& too large, maximum allowed is 64",
5104 -- Check size against explicit given size
5106 if Has_Size_Clause (Typ) then
5107 if Actual_Size > RM_Size (Typ) then
5108 Error_Msg_Uint_1 := RM_Size (Typ);
5109 Error_Msg_Uint_2 := UI_From_Int (Actual_Size);
5111 ("size given (^) for type& too small, minimum allowed is ^",
5112 Size_Clause (Typ), Typ);
5115 Actual_Size := UI_To_Int (Esize (Typ));
5118 -- Increase size to next natural boundary if no size clause given
5121 if Actual_Size <= 8 then
5123 elsif Actual_Size <= 16 then
5125 elsif Actual_Size <= 32 then
5131 Init_Esize (Typ, Actual_Size);
5132 Adjust_Esize_For_Alignment (Typ);
5135 -- If we have a base type, then expand the bounds so that they extend to
5136 -- the full width of the allocated size in bits, to avoid junk range
5137 -- checks on intermediate computations.
5139 if Base_Type (Typ) = Typ then
5140 Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1))));
5141 Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1)));
5144 -- Final step is to reanalyze the bounds using the proper type
5145 -- and set the Corresponding_Integer_Value fields of the literals.
5147 Set_Etype (Lo, Empty);
5148 Set_Analyzed (Lo, False);
5151 -- Resolve with universal fixed if the base type, and the base type if
5152 -- it is a subtype. Note we can't resolve the base type with itself,
5153 -- that would be a reference before definition.
5156 Resolve (Lo, Universal_Fixed);
5161 -- Set corresponding integer value for bound
5163 Set_Corresponding_Integer_Value
5164 (Lo, UR_To_Uint (Realval (Lo) / Small));
5166 -- Similar processing for high bound
5168 Set_Etype (Hi, Empty);
5169 Set_Analyzed (Hi, False);
5173 Resolve (Hi, Universal_Fixed);
5178 Set_Corresponding_Integer_Value
5179 (Hi, UR_To_Uint (Realval (Hi) / Small));
5181 -- Set type of range to correspond to bounds
5183 Set_Etype (Rng, Etype (Lo));
5185 -- Set Esize to calculated size if not set already
5187 if Unknown_Esize (Typ) then
5188 Init_Esize (Typ, Actual_Size);
5191 -- Set RM_Size if not already set. If already set, check value
5194 Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ));
5197 if RM_Size (Typ) /= Uint_0 then
5198 if RM_Size (Typ) < Minsiz then
5199 Error_Msg_Uint_1 := RM_Size (Typ);
5200 Error_Msg_Uint_2 := Minsiz;
5202 ("size given (^) for type& too small, minimum allowed is ^",
5203 Size_Clause (Typ), Typ);
5207 Set_RM_Size (Typ, Minsiz);
5210 end Freeze_Fixed_Point_Type;
5216 procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is
5220 Set_Has_Delayed_Freeze (T);
5221 L := Freeze_Entity (T, N);
5223 if Is_Non_Empty_List (L) then
5224 Insert_Actions (N, L);
5228 --------------------------
5229 -- Freeze_Static_Object --
5230 --------------------------
5232 procedure Freeze_Static_Object (E : Entity_Id) is
5234 Cannot_Be_Static : exception;
5235 -- Exception raised if the type of a static object cannot be made
5236 -- static. This happens if the type depends on non-global objects.
5238 procedure Ensure_Expression_Is_SA (N : Node_Id);
5239 -- Called to ensure that an expression used as part of a type definition
5240 -- is statically allocatable, which means that the expression type is
5241 -- statically allocatable, and the expression is either static, or a
5242 -- reference to a library level constant.
5244 procedure Ensure_Type_Is_SA (Typ : Entity_Id);
5245 -- Called to mark a type as static, checking that it is possible
5246 -- to set the type as static. If it is not possible, then the
5247 -- exception Cannot_Be_Static is raised.
5249 -----------------------------
5250 -- Ensure_Expression_Is_SA --
5251 -----------------------------
5253 procedure Ensure_Expression_Is_SA (N : Node_Id) is
5257 Ensure_Type_Is_SA (Etype (N));
5259 if Is_Static_Expression (N) then
5262 elsif Nkind (N) = N_Identifier then
5266 and then Ekind (Ent) = E_Constant
5267 and then Is_Library_Level_Entity (Ent)
5273 raise Cannot_Be_Static;
5274 end Ensure_Expression_Is_SA;
5276 -----------------------
5277 -- Ensure_Type_Is_SA --
5278 -----------------------
5280 procedure Ensure_Type_Is_SA (Typ : Entity_Id) is
5285 -- If type is library level, we are all set
5287 if Is_Library_Level_Entity (Typ) then
5291 -- We are also OK if the type already marked as statically allocated,
5292 -- which means we processed it before.
5294 if Is_Statically_Allocated (Typ) then
5298 -- Mark type as statically allocated
5300 Set_Is_Statically_Allocated (Typ);
5302 -- Check that it is safe to statically allocate this type
5304 if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then
5305 Ensure_Expression_Is_SA (Type_Low_Bound (Typ));
5306 Ensure_Expression_Is_SA (Type_High_Bound (Typ));
5308 elsif Is_Array_Type (Typ) then
5309 N := First_Index (Typ);
5310 while Present (N) loop
5311 Ensure_Type_Is_SA (Etype (N));
5315 Ensure_Type_Is_SA (Component_Type (Typ));
5317 elsif Is_Access_Type (Typ) then
5318 if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then
5322 T : constant Entity_Id := Etype (Designated_Type (Typ));
5325 if T /= Standard_Void_Type then
5326 Ensure_Type_Is_SA (T);
5329 F := First_Formal (Designated_Type (Typ));
5330 while Present (F) loop
5331 Ensure_Type_Is_SA (Etype (F));
5337 Ensure_Type_Is_SA (Designated_Type (Typ));
5340 elsif Is_Record_Type (Typ) then
5341 C := First_Entity (Typ);
5342 while Present (C) loop
5343 if Ekind (C) = E_Discriminant
5344 or else Ekind (C) = E_Component
5346 Ensure_Type_Is_SA (Etype (C));
5348 elsif Is_Type (C) then
5349 Ensure_Type_Is_SA (C);
5355 elsif Ekind (Typ) = E_Subprogram_Type then
5356 Ensure_Type_Is_SA (Etype (Typ));
5358 C := First_Formal (Typ);
5359 while Present (C) loop
5360 Ensure_Type_Is_SA (Etype (C));
5365 raise Cannot_Be_Static;
5367 end Ensure_Type_Is_SA;
5369 -- Start of processing for Freeze_Static_Object
5372 Ensure_Type_Is_SA (Etype (E));
5375 when Cannot_Be_Static =>
5377 -- If the object that cannot be static is imported or exported, then
5378 -- issue an error message saying that this object cannot be imported
5379 -- or exported. If it has an address clause it is an overlay in the
5380 -- current partition and the static requirement is not relevant.
5381 -- Do not issue any error message when ignoring rep clauses.
5383 if Ignore_Rep_Clauses then
5386 elsif Is_Imported (E) then
5387 if No (Address_Clause (E)) then
5389 ("& cannot be imported (local type is not constant)", E);
5392 -- Otherwise must be exported, something is wrong if compiler
5393 -- is marking something as statically allocated which cannot be).
5395 else pragma Assert (Is_Exported (E));
5397 ("& cannot be exported (local type is not constant)", E);
5399 end Freeze_Static_Object;
5401 -----------------------
5402 -- Freeze_Subprogram --
5403 -----------------------
5405 procedure Freeze_Subprogram (E : Entity_Id) is
5410 -- Subprogram may not have an address clause unless it is imported
5412 if Present (Address_Clause (E)) then
5413 if not Is_Imported (E) then
5415 ("address clause can only be given " &
5416 "for imported subprogram",
5417 Name (Address_Clause (E)));
5421 -- Reset the Pure indication on an imported subprogram unless an
5422 -- explicit Pure_Function pragma was present. We do this because
5423 -- otherwise it is an insidious error to call a non-pure function from
5424 -- pure unit and have calls mysteriously optimized away. What happens
5425 -- here is that the Import can bypass the normal check to ensure that
5426 -- pure units call only pure subprograms.
5429 and then Is_Pure (E)
5430 and then not Has_Pragma_Pure_Function (E)
5432 Set_Is_Pure (E, False);
5435 -- For non-foreign convention subprograms, this is where we create
5436 -- the extra formals (for accessibility level and constrained bit
5437 -- information). We delay this till the freeze point precisely so
5438 -- that we know the convention!
5440 if not Has_Foreign_Convention (E) then
5441 Create_Extra_Formals (E);
5444 -- If this is convention Ada and a Valued_Procedure, that's odd
5446 if Ekind (E) = E_Procedure
5447 and then Is_Valued_Procedure (E)
5448 and then Convention (E) = Convention_Ada
5449 and then Warn_On_Export_Import
5452 ("?Valued_Procedure has no effect for convention Ada", E);
5453 Set_Is_Valued_Procedure (E, False);
5456 -- Case of foreign convention
5461 -- For foreign conventions, warn about return of an
5462 -- unconstrained array.
5464 -- Note: we *do* allow a return by descriptor for the VMS case,
5465 -- though here there is probably more to be done ???
5467 if Ekind (E) = E_Function then
5468 Retype := Underlying_Type (Etype (E));
5470 -- If no return type, probably some other error, e.g. a
5471 -- missing full declaration, so ignore.
5476 -- If the return type is generic, we have emitted a warning
5477 -- earlier on, and there is nothing else to check here. Specific
5478 -- instantiations may lead to erroneous behavior.
5480 elsif Is_Generic_Type (Etype (E)) then
5483 -- Display warning if returning unconstrained array
5485 elsif Is_Array_Type (Retype)
5486 and then not Is_Constrained (Retype)
5488 -- Exclude cases where descriptor mechanism is set, since the
5489 -- VMS descriptor mechanisms allow such unconstrained returns.
5491 and then Mechanism (E) not in Descriptor_Codes
5493 -- Check appropriate warning is enabled (should we check for
5494 -- Warnings (Off) on specific entities here, probably so???)
5496 and then Warn_On_Export_Import
5498 -- Exclude the VM case, since return of unconstrained arrays
5499 -- is properly handled in both the JVM and .NET cases.
5501 and then VM_Target = No_VM
5504 ("?foreign convention function& should not return " &
5505 "unconstrained array", E);
5510 -- If any of the formals for an exported foreign convention
5511 -- subprogram have defaults, then emit an appropriate warning since
5512 -- this is odd (default cannot be used from non-Ada code)
5514 if Is_Exported (E) then
5515 F := First_Formal (E);
5516 while Present (F) loop
5517 if Warn_On_Export_Import
5518 and then Present (Default_Value (F))
5521 ("?parameter cannot be defaulted in non-Ada call",
5530 -- For VMS, descriptor mechanisms for parameters are allowed only for
5531 -- imported/exported subprograms. Moreover, the NCA descriptor is not
5532 -- allowed for parameters of exported subprograms.
5534 if OpenVMS_On_Target then
5535 if Is_Exported (E) then
5536 F := First_Formal (E);
5537 while Present (F) loop
5538 if Mechanism (F) = By_Descriptor_NCA then
5540 ("'N'C'A' descriptor for parameter not permitted", F);
5542 ("\can only be used for imported subprogram", F);
5548 elsif not Is_Imported (E) then
5549 F := First_Formal (E);
5550 while Present (F) loop
5551 if Mechanism (F) in Descriptor_Codes then
5553 ("descriptor mechanism for parameter not permitted", F);
5555 ("\can only be used for imported/exported subprogram", F);
5563 -- Pragma Inline_Always is disallowed for dispatching subprograms
5564 -- because the address of such subprograms is saved in the dispatch
5565 -- table to support dispatching calls, and dispatching calls cannot
5566 -- be inlined. This is consistent with the restriction against using
5567 -- 'Access or 'Address on an Inline_Always subprogram.
5569 if Is_Dispatching_Operation (E)
5570 and then Has_Pragma_Inline_Always (E)
5573 ("pragma Inline_Always not allowed for dispatching subprograms", E);
5576 -- Because of the implicit representation of inherited predefined
5577 -- operators in the front-end, the overriding status of the operation
5578 -- may be affected when a full view of a type is analyzed, and this is
5579 -- not captured by the analysis of the corresponding type declaration.
5580 -- Therefore the correctness of a not-overriding indicator must be
5581 -- rechecked when the subprogram is frozen.
5583 if Nkind (E) = N_Defining_Operator_Symbol
5584 and then not Error_Posted (Parent (E))
5586 Check_Overriding_Indicator (E, Empty, Is_Primitive (E));
5588 end Freeze_Subprogram;
5590 ----------------------
5591 -- Is_Fully_Defined --
5592 ----------------------
5594 function Is_Fully_Defined (T : Entity_Id) return Boolean is
5596 if Ekind (T) = E_Class_Wide_Type then
5597 return Is_Fully_Defined (Etype (T));
5599 elsif Is_Array_Type (T) then
5600 return Is_Fully_Defined (Component_Type (T));
5602 elsif Is_Record_Type (T)
5603 and not Is_Private_Type (T)
5605 -- Verify that the record type has no components with private types
5606 -- without completion.
5612 Comp := First_Component (T);
5613 while Present (Comp) loop
5614 if not Is_Fully_Defined (Etype (Comp)) then
5618 Next_Component (Comp);
5623 -- For the designated type of an access to subprogram, all types in
5624 -- the profile must be fully defined.
5626 elsif Ekind (T) = E_Subprogram_Type then
5631 F := First_Formal (T);
5632 while Present (F) loop
5633 if not Is_Fully_Defined (Etype (F)) then
5640 return Is_Fully_Defined (Etype (T));
5644 return not Is_Private_Type (T)
5645 or else Present (Full_View (Base_Type (T)));
5647 end Is_Fully_Defined;
5649 ---------------------------------
5650 -- Process_Default_Expressions --
5651 ---------------------------------
5653 procedure Process_Default_Expressions
5655 After : in out Node_Id)
5657 Loc : constant Source_Ptr := Sloc (E);
5664 Set_Default_Expressions_Processed (E);
5666 -- A subprogram instance and its associated anonymous subprogram share
5667 -- their signature. The default expression functions are defined in the
5668 -- wrapper packages for the anonymous subprogram, and should not be
5669 -- generated again for the instance.
5671 if Is_Generic_Instance (E)
5672 and then Present (Alias (E))
5673 and then Default_Expressions_Processed (Alias (E))
5678 Formal := First_Formal (E);
5679 while Present (Formal) loop
5680 if Present (Default_Value (Formal)) then
5682 -- We work with a copy of the default expression because we
5683 -- do not want to disturb the original, since this would mess
5684 -- up the conformance checking.
5686 Dcopy := New_Copy_Tree (Default_Value (Formal));
5688 -- The analysis of the expression may generate insert actions,
5689 -- which of course must not be executed. We wrap those actions
5690 -- in a procedure that is not called, and later on eliminated.
5691 -- The following cases have no side-effects, and are analyzed
5694 if Nkind (Dcopy) = N_Identifier
5695 or else Nkind (Dcopy) = N_Expanded_Name
5696 or else Nkind (Dcopy) = N_Integer_Literal
5697 or else (Nkind (Dcopy) = N_Real_Literal
5698 and then not Vax_Float (Etype (Dcopy)))
5699 or else Nkind (Dcopy) = N_Character_Literal
5700 or else Nkind (Dcopy) = N_String_Literal
5701 or else Known_Null (Dcopy)
5702 or else (Nkind (Dcopy) = N_Attribute_Reference
5704 Attribute_Name (Dcopy) = Name_Null_Parameter)
5707 -- If there is no default function, we must still do a full
5708 -- analyze call on the default value, to ensure that all error
5709 -- checks are performed, e.g. those associated with static
5710 -- evaluation. Note: this branch will always be taken if the
5711 -- analyzer is turned off (but we still need the error checks).
5713 -- Note: the setting of parent here is to meet the requirement
5714 -- that we can only analyze the expression while attached to
5715 -- the tree. Really the requirement is that the parent chain
5716 -- be set, we don't actually need to be in the tree.
5718 Set_Parent (Dcopy, Declaration_Node (Formal));
5721 -- Default expressions are resolved with their own type if the
5722 -- context is generic, to avoid anomalies with private types.
5724 if Ekind (Scope (E)) = E_Generic_Package then
5727 Resolve (Dcopy, Etype (Formal));
5730 -- If that resolved expression will raise constraint error,
5731 -- then flag the default value as raising constraint error.
5732 -- This allows a proper error message on the calls.
5734 if Raises_Constraint_Error (Dcopy) then
5735 Set_Raises_Constraint_Error (Default_Value (Formal));
5738 -- If the default is a parameterless call, we use the name of
5739 -- the called function directly, and there is no body to build.
5741 elsif Nkind (Dcopy) = N_Function_Call
5742 and then No (Parameter_Associations (Dcopy))
5746 -- Else construct and analyze the body of a wrapper procedure
5747 -- that contains an object declaration to hold the expression.
5748 -- Given that this is done only to complete the analysis, it
5749 -- simpler to build a procedure than a function which might
5750 -- involve secondary stack expansion.
5753 Dnam := Make_Temporary (Loc, 'D');
5756 Make_Subprogram_Body (Loc,
5758 Make_Procedure_Specification (Loc,
5759 Defining_Unit_Name => Dnam),
5761 Declarations => New_List (
5762 Make_Object_Declaration (Loc,
5763 Defining_Identifier => Make_Temporary (Loc, 'T'),
5764 Object_Definition =>
5765 New_Occurrence_Of (Etype (Formal), Loc),
5766 Expression => New_Copy_Tree (Dcopy))),
5768 Handled_Statement_Sequence =>
5769 Make_Handled_Sequence_Of_Statements (Loc,
5770 Statements => Empty_List));
5772 Set_Scope (Dnam, Scope (E));
5773 Set_Assignment_OK (First (Declarations (Dbody)));
5774 Set_Is_Eliminated (Dnam);
5775 Insert_After (After, Dbody);
5781 Next_Formal (Formal);
5783 end Process_Default_Expressions;
5785 ----------------------------------------
5786 -- Set_Component_Alignment_If_Not_Set --
5787 ----------------------------------------
5789 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is
5791 -- Ignore if not base type, subtypes don't need anything
5793 if Typ /= Base_Type (Typ) then
5797 -- Do not override existing representation
5799 if Is_Packed (Typ) then
5802 elsif Has_Specified_Layout (Typ) then
5805 elsif Component_Alignment (Typ) /= Calign_Default then
5809 Set_Component_Alignment
5810 (Typ, Scope_Stack.Table
5811 (Scope_Stack.Last).Component_Alignment_Default);
5813 end Set_Component_Alignment_If_Not_Set;
5819 procedure Undelay_Type (T : Entity_Id) is
5821 Set_Has_Delayed_Freeze (T, False);
5822 Set_Freeze_Node (T, Empty);
5824 -- Since we don't want T to have a Freeze_Node, we don't want its
5825 -- Full_View or Corresponding_Record_Type to have one either.
5827 -- ??? Fundamentally, this whole handling is a kludge. What we really
5828 -- want is to be sure that for an Itype that's part of record R and is a
5829 -- subtype of type T, that it's frozen after the later of the freeze
5830 -- points of R and T. We have no way of doing that directly, so what we
5831 -- do is force most such Itypes to be frozen as part of freezing R via
5832 -- this procedure and only delay the ones that need to be delayed
5833 -- (mostly the designated types of access types that are defined as part
5836 if Is_Private_Type (T)
5837 and then Present (Full_View (T))
5838 and then Is_Itype (Full_View (T))
5839 and then Is_Record_Type (Scope (Full_View (T)))
5841 Undelay_Type (Full_View (T));
5844 if Is_Concurrent_Type (T)
5845 and then Present (Corresponding_Record_Type (T))
5846 and then Is_Itype (Corresponding_Record_Type (T))
5847 and then Is_Record_Type (Scope (Corresponding_Record_Type (T)))
5849 Undelay_Type (Corresponding_Record_Type (T));
5857 procedure Warn_Overlay
5862 Ent : constant Entity_Id := Entity (Nam);
5863 -- The object to which the address clause applies
5866 Old : Entity_Id := Empty;
5870 -- No warning if address clause overlay warnings are off
5872 if not Address_Clause_Overlay_Warnings then
5876 -- No warning if there is an explicit initialization
5878 Init := Original_Node (Expression (Declaration_Node (Ent)));
5880 if Present (Init) and then Comes_From_Source (Init) then
5884 -- We only give the warning for non-imported entities of a type for
5885 -- which a non-null base init proc is defined, or for objects of access
5886 -- types with implicit null initialization, or when Normalize_Scalars
5887 -- applies and the type is scalar or a string type (the latter being
5888 -- tested for because predefined String types are initialized by inline
5889 -- code rather than by an init_proc). Note that we do not give the
5890 -- warning for Initialize_Scalars, since we suppressed initialization
5891 -- in this case. Also, do not warn if Suppress_Initialization is set.
5894 and then not Is_Imported (Ent)
5895 and then not Initialization_Suppressed (Typ)
5896 and then (Has_Non_Null_Base_Init_Proc (Typ)
5897 or else Is_Access_Type (Typ)
5898 or else (Normalize_Scalars
5899 and then (Is_Scalar_Type (Typ)
5900 or else Is_String_Type (Typ))))
5902 if Nkind (Expr) = N_Attribute_Reference
5903 and then Is_Entity_Name (Prefix (Expr))
5905 Old := Entity (Prefix (Expr));
5907 elsif Is_Entity_Name (Expr)
5908 and then Ekind (Entity (Expr)) = E_Constant
5910 Decl := Declaration_Node (Entity (Expr));
5912 if Nkind (Decl) = N_Object_Declaration
5913 and then Present (Expression (Decl))
5914 and then Nkind (Expression (Decl)) = N_Attribute_Reference
5915 and then Is_Entity_Name (Prefix (Expression (Decl)))
5917 Old := Entity (Prefix (Expression (Decl)));
5919 elsif Nkind (Expr) = N_Function_Call then
5923 -- A function call (most likely to To_Address) is probably not an
5924 -- overlay, so skip warning. Ditto if the function call was inlined
5925 -- and transformed into an entity.
5927 elsif Nkind (Original_Node (Expr)) = N_Function_Call then
5931 Decl := Next (Parent (Expr));
5933 -- If a pragma Import follows, we assume that it is for the current
5934 -- target of the address clause, and skip the warning.
5937 and then Nkind (Decl) = N_Pragma
5938 and then Pragma_Name (Decl) = Name_Import
5943 if Present (Old) then
5944 Error_Msg_Node_2 := Old;
5946 ("default initialization of & may modify &?",
5950 ("default initialization of & may modify overlaid storage?",
5954 -- Add friendly warning if initialization comes from a packed array
5957 if Is_Record_Type (Typ) then
5962 Comp := First_Component (Typ);
5963 while Present (Comp) loop
5964 if Nkind (Parent (Comp)) = N_Component_Declaration
5965 and then Present (Expression (Parent (Comp)))
5968 elsif Is_Array_Type (Etype (Comp))
5969 and then Present (Packed_Array_Type (Etype (Comp)))
5972 ("\packed array component& " &
5973 "will be initialized to zero?",
5977 Next_Component (Comp);
5984 ("\use pragma Import for & to " &
5985 "suppress initialization (RM B.1(24))?",