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 elsif Ekind (E) in Task_Kind
1264 (Nkind (Parent (E)) = N_Task_Type_Declaration
1266 Nkind (Parent (E)) = N_Single_Task_Declaration)
1269 Freeze_All (First_Entity (E), After);
1272 -- For a derived tagged type, we must ensure that all the
1273 -- primitive operations of the parent have been frozen, so that
1274 -- their addresses will be in the parent's dispatch table at the
1275 -- point it is inherited.
1277 elsif Ekind (E) = E_Record_Type
1278 and then Is_Tagged_Type (E)
1279 and then Is_Tagged_Type (Etype (E))
1280 and then Is_Derived_Type (E)
1283 Prim_List : constant Elist_Id :=
1284 Primitive_Operations (Etype (E));
1290 Prim := First_Elmt (Prim_List);
1291 while Present (Prim) loop
1292 Subp := Node (Prim);
1294 if Comes_From_Source (Subp)
1295 and then not Is_Frozen (Subp)
1297 Flist := Freeze_Entity (Subp, After);
1306 if not Is_Frozen (E) then
1307 Flist := Freeze_Entity (E, After);
1310 -- If already frozen, and there are delayed aspects, this is where
1311 -- we do the visibility check for these aspects (see Sem_Ch13 spec
1312 -- for a description of how we handle aspect visibility).
1314 elsif Has_Delayed_Aspects (E) then
1319 Ritem := First_Rep_Item (E);
1320 while Present (Ritem) loop
1321 if Nkind (Ritem) = N_Aspect_Specification
1322 and then Entity (Ritem) = E
1323 and then Is_Delayed_Aspect (Ritem)
1325 Check_Aspect_At_End_Of_Declarations (Ritem);
1328 Ritem := Next_Rep_Item (Ritem);
1333 -- If an incomplete type is still not frozen, this may be a
1334 -- premature freezing because of a body declaration that follows.
1335 -- Indicate where the freezing took place.
1337 -- If the freezing is caused by the end of the current declarative
1338 -- part, it is a Taft Amendment type, and there is no error.
1340 if not Is_Frozen (E)
1341 and then Ekind (E) = E_Incomplete_Type
1344 Bod : constant Node_Id := Next (After);
1347 if (Nkind_In (Bod, N_Subprogram_Body,
1352 or else Nkind (Bod) in N_Body_Stub)
1354 List_Containing (After) = List_Containing (Parent (E))
1356 Error_Msg_Sloc := Sloc (Next (After));
1358 ("type& is frozen# before its full declaration",
1368 -- Start of processing for Freeze_All
1371 Freeze_All_Ent (From, After);
1373 -- Now that all types are frozen, we can deal with default expressions
1374 -- that require us to build a default expression functions. This is the
1375 -- point at which such functions are constructed (after all types that
1376 -- might be used in such expressions have been frozen).
1378 -- For subprograms that are renaming_as_body, we create the wrapper
1379 -- bodies as needed.
1381 -- We also add finalization chains to access types whose designated
1382 -- types are controlled. This is normally done when freezing the type,
1383 -- but this misses recursive type definitions where the later members
1384 -- of the recursion introduce controlled components.
1386 -- Loop through entities
1389 while Present (E) loop
1390 if Is_Subprogram (E) then
1392 if not Default_Expressions_Processed (E) then
1393 Process_Default_Expressions (E, After);
1396 if not Has_Completion (E) then
1397 Decl := Unit_Declaration_Node (E);
1399 if Nkind (Decl) = N_Subprogram_Renaming_Declaration then
1400 Build_And_Analyze_Renamed_Body (Decl, E, After);
1402 elsif Nkind (Decl) = N_Subprogram_Declaration
1403 and then Present (Corresponding_Body (Decl))
1405 Nkind (Unit_Declaration_Node (Corresponding_Body (Decl)))
1406 = N_Subprogram_Renaming_Declaration
1408 Build_And_Analyze_Renamed_Body
1409 (Decl, Corresponding_Body (Decl), After);
1413 elsif Ekind (E) in Task_Kind
1415 (Nkind (Parent (E)) = N_Task_Type_Declaration
1417 Nkind (Parent (E)) = N_Single_Task_Declaration)
1423 Ent := First_Entity (E);
1424 while Present (Ent) loop
1426 and then not Default_Expressions_Processed (Ent)
1428 Process_Default_Expressions (Ent, After);
1435 -- We add finalization collections to access types whose designated
1436 -- types require finalization. This is normally done when freezing
1437 -- the type, but this misses recursive type definitions where the
1438 -- later members of the recursion introduce controlled components
1439 -- (such as can happen when incomplete types are involved), as well
1440 -- cases where a component type is private and the controlled full
1441 -- type occurs after the access type is frozen. Cases that don't
1442 -- need a finalization collection are generic formal types (the
1443 -- actual type will have it) and types with Java and CIL conventions,
1444 -- since those are used for API bindings. (Are there any other cases
1445 -- that should be excluded here???)
1447 elsif Is_Access_Type (E)
1448 and then Comes_From_Source (E)
1449 and then not Is_Generic_Type (E)
1450 and then Needs_Finalization (Designated_Type (E))
1451 and then No (Associated_Collection (E))
1452 and then Convention (Designated_Type (E)) /= Convention_Java
1453 and then Convention (Designated_Type (E)) /= Convention_CIL
1455 Build_Finalization_Collection (E);
1462 -----------------------
1463 -- Freeze_And_Append --
1464 -----------------------
1466 procedure Freeze_And_Append
1469 Result : in out List_Id)
1471 L : constant List_Id := Freeze_Entity (Ent, N);
1473 if Is_Non_Empty_List (L) then
1474 if Result = No_List then
1477 Append_List (L, Result);
1480 end Freeze_And_Append;
1486 procedure Freeze_Before (N : Node_Id; T : Entity_Id) is
1487 Freeze_Nodes : constant List_Id := Freeze_Entity (T, N);
1489 if Is_Non_Empty_List (Freeze_Nodes) then
1490 Insert_Actions (N, Freeze_Nodes);
1498 function Freeze_Entity (E : Entity_Id; N : Node_Id) return List_Id is
1499 Loc : constant Source_Ptr := Sloc (N);
1500 Test_E : Entity_Id := E;
1507 Result : List_Id := No_List;
1508 -- List of freezing actions, left at No_List if none
1510 Has_Default_Initialization : Boolean := False;
1511 -- This flag gets set to true for a variable with default initialization
1513 procedure Add_To_Result (N : Node_Id);
1514 -- N is a freezing action to be appended to the Result
1516 procedure Check_Current_Instance (Comp_Decl : Node_Id);
1517 -- Check that an Access or Unchecked_Access attribute with a prefix
1518 -- which is the current instance type can only be applied when the type
1521 procedure Check_Suspicious_Modulus (Utype : Entity_Id);
1522 -- Give warning for modulus of 8, 16, 32, or 64 given as an explicit
1523 -- integer literal without an explicit corresponding size clause. The
1524 -- caller has checked that Utype is a modular integer type.
1526 function After_Last_Declaration return Boolean;
1527 -- If Loc is a freeze_entity that appears after the last declaration
1528 -- in the scope, inhibit error messages on late completion.
1530 procedure Freeze_Record_Type (Rec : Entity_Id);
1531 -- Freeze each component, handle some representation clauses, and freeze
1532 -- primitive operations if this is a tagged type.
1538 procedure Add_To_Result (N : Node_Id) is
1541 Result := New_List (N);
1547 ----------------------------
1548 -- After_Last_Declaration --
1549 ----------------------------
1551 function After_Last_Declaration return Boolean is
1552 Spec : constant Node_Id := Parent (Current_Scope);
1554 if Nkind (Spec) = N_Package_Specification then
1555 if Present (Private_Declarations (Spec)) then
1556 return Loc >= Sloc (Last (Private_Declarations (Spec)));
1557 elsif Present (Visible_Declarations (Spec)) then
1558 return Loc >= Sloc (Last (Visible_Declarations (Spec)));
1565 end After_Last_Declaration;
1567 ----------------------------
1568 -- Check_Current_Instance --
1569 ----------------------------
1571 procedure Check_Current_Instance (Comp_Decl : Node_Id) is
1573 Rec_Type : constant Entity_Id :=
1574 Scope (Defining_Identifier (Comp_Decl));
1576 Decl : constant Node_Id := Parent (Rec_Type);
1578 function Process (N : Node_Id) return Traverse_Result;
1579 -- Process routine to apply check to given node
1585 function Process (N : Node_Id) return Traverse_Result is
1588 when N_Attribute_Reference =>
1589 if (Attribute_Name (N) = Name_Access
1591 Attribute_Name (N) = Name_Unchecked_Access)
1592 and then Is_Entity_Name (Prefix (N))
1593 and then Is_Type (Entity (Prefix (N)))
1594 and then Entity (Prefix (N)) = E
1597 ("current instance must be a limited type", Prefix (N));
1603 when others => return OK;
1607 procedure Traverse is new Traverse_Proc (Process);
1609 -- Start of processing for Check_Current_Instance
1612 -- In Ada95, the (imprecise) rule is that the current instance of a
1613 -- limited type is aliased. In Ada2005, limitedness must be explicit:
1614 -- either a tagged type, or a limited record.
1616 if Is_Limited_Type (Rec_Type)
1617 and then (Ada_Version < Ada_2005 or else Is_Tagged_Type (Rec_Type))
1621 elsif Nkind (Decl) = N_Full_Type_Declaration
1622 and then Limited_Present (Type_Definition (Decl))
1627 Traverse (Comp_Decl);
1629 end Check_Current_Instance;
1631 ------------------------------
1632 -- Check_Suspicious_Modulus --
1633 ------------------------------
1635 procedure Check_Suspicious_Modulus (Utype : Entity_Id) is
1636 Decl : constant Node_Id := Declaration_Node (Underlying_Type (Utype));
1639 if Nkind (Decl) = N_Full_Type_Declaration then
1641 Tdef : constant Node_Id := Type_Definition (Decl);
1643 if Nkind (Tdef) = N_Modular_Type_Definition then
1645 Modulus : constant Node_Id :=
1646 Original_Node (Expression (Tdef));
1648 if Nkind (Modulus) = N_Integer_Literal then
1650 Modv : constant Uint := Intval (Modulus);
1651 Sizv : constant Uint := RM_Size (Utype);
1654 -- First case, modulus and size are the same. This
1655 -- happens if you have something like mod 32, with
1656 -- an explicit size of 32, this is for sure a case
1657 -- where the warning is given, since it is seems
1658 -- very unlikely that someone would want e.g. a
1659 -- five bit type stored in 32 bits. It is much
1660 -- more likely they wanted a 32-bit type.
1665 -- Second case, the modulus is 32 or 64 and no
1666 -- size clause is present. This is a less clear
1667 -- case for giving the warning, but in the case
1668 -- of 32/64 (5-bit or 6-bit types) these seem rare
1669 -- enough that it is a likely error (and in any
1670 -- case using 2**5 or 2**6 in these cases seems
1671 -- clearer. We don't include 8 or 16 here, simply
1672 -- because in practice 3-bit and 4-bit types are
1673 -- more common and too many false positives if
1674 -- we warn in these cases.
1676 elsif not Has_Size_Clause (Utype)
1677 and then (Modv = Uint_32 or else Modv = Uint_64)
1681 -- No warning needed
1687 -- If we fall through, give warning
1689 Error_Msg_Uint_1 := Modv;
1691 ("?2 '*'*^' may have been intended here",
1699 end Check_Suspicious_Modulus;
1701 ------------------------
1702 -- Freeze_Record_Type --
1703 ------------------------
1705 procedure Freeze_Record_Type (Rec : Entity_Id) is
1712 pragma Warnings (Off, Junk);
1714 Unplaced_Component : Boolean := False;
1715 -- Set True if we find at least one component with no component
1716 -- clause (used to warn about useless Pack pragmas).
1718 Placed_Component : Boolean := False;
1719 -- Set True if we find at least one component with a component
1720 -- clause (used to warn about useless Bit_Order pragmas, and also
1721 -- to detect cases where Implicit_Packing may have an effect).
1723 All_Scalar_Components : Boolean := True;
1724 -- Set False if we encounter a component of a non-scalar type
1726 Scalar_Component_Total_RM_Size : Uint := Uint_0;
1727 Scalar_Component_Total_Esize : Uint := Uint_0;
1728 -- Accumulates total RM_Size values and total Esize values of all
1729 -- scalar components. Used for processing of Implicit_Packing.
1731 function Check_Allocator (N : Node_Id) return Node_Id;
1732 -- If N is an allocator, possibly wrapped in one or more level of
1733 -- qualified expression(s), return the inner allocator node, else
1736 procedure Check_Itype (Typ : Entity_Id);
1737 -- If the component subtype is an access to a constrained subtype of
1738 -- an already frozen type, make the subtype frozen as well. It might
1739 -- otherwise be frozen in the wrong scope, and a freeze node on
1740 -- subtype has no effect. Similarly, if the component subtype is a
1741 -- regular (not protected) access to subprogram, set the anonymous
1742 -- subprogram type to frozen as well, to prevent an out-of-scope
1743 -- freeze node at some eventual point of call. Protected operations
1744 -- are handled elsewhere.
1746 ---------------------
1747 -- Check_Allocator --
1748 ---------------------
1750 function Check_Allocator (N : Node_Id) return Node_Id is
1755 if Nkind (Inner) = N_Allocator then
1757 elsif Nkind (Inner) = N_Qualified_Expression then
1758 Inner := Expression (Inner);
1763 end Check_Allocator;
1769 procedure Check_Itype (Typ : Entity_Id) is
1770 Desig : constant Entity_Id := Designated_Type (Typ);
1773 if not Is_Frozen (Desig)
1774 and then Is_Frozen (Base_Type (Desig))
1776 Set_Is_Frozen (Desig);
1778 -- In addition, add an Itype_Reference to ensure that the
1779 -- access subtype is elaborated early enough. This cannot be
1780 -- done if the subtype may depend on discriminants.
1782 if Ekind (Comp) = E_Component
1783 and then Is_Itype (Etype (Comp))
1784 and then not Has_Discriminants (Rec)
1786 IR := Make_Itype_Reference (Sloc (Comp));
1787 Set_Itype (IR, Desig);
1791 elsif Ekind (Typ) = E_Anonymous_Access_Subprogram_Type
1792 and then Convention (Desig) /= Convention_Protected
1794 Set_Is_Frozen (Desig);
1798 -- Start of processing for Freeze_Record_Type
1801 -- Freeze components and embedded subtypes
1803 Comp := First_Entity (Rec);
1805 while Present (Comp) loop
1807 -- First handle the component case
1809 if Ekind (Comp) = E_Component
1810 or else Ekind (Comp) = E_Discriminant
1813 CC : constant Node_Id := Component_Clause (Comp);
1816 -- Freezing a record type freezes the type of each of its
1817 -- components. However, if the type of the component is
1818 -- part of this record, we do not want or need a separate
1819 -- Freeze_Node. Note that Is_Itype is wrong because that's
1820 -- also set in private type cases. We also can't check for
1821 -- the Scope being exactly Rec because of private types and
1822 -- record extensions.
1824 if Is_Itype (Etype (Comp))
1825 and then Is_Record_Type (Underlying_Type
1826 (Scope (Etype (Comp))))
1828 Undelay_Type (Etype (Comp));
1831 Freeze_And_Append (Etype (Comp), N, Result);
1833 -- Check for error of component clause given for variable
1834 -- sized type. We have to delay this test till this point,
1835 -- since the component type has to be frozen for us to know
1836 -- if it is variable length. We omit this test in a generic
1837 -- context, it will be applied at instantiation time.
1839 if Present (CC) then
1840 Placed_Component := True;
1842 if Inside_A_Generic then
1846 Size_Known_At_Compile_Time
1847 (Underlying_Type (Etype (Comp)))
1850 ("component clause not allowed for variable " &
1851 "length component", CC);
1855 Unplaced_Component := True;
1858 -- Case of component requires byte alignment
1860 if Must_Be_On_Byte_Boundary (Etype (Comp)) then
1862 -- Set the enclosing record to also require byte align
1864 Set_Must_Be_On_Byte_Boundary (Rec);
1866 -- Check for component clause that is inconsistent with
1867 -- the required byte boundary alignment.
1870 and then Normalized_First_Bit (Comp) mod
1871 System_Storage_Unit /= 0
1874 ("component & must be byte aligned",
1875 Component_Name (Component_Clause (Comp)));
1881 -- Gather data for possible Implicit_Packing later. Note that at
1882 -- this stage we might be dealing with a real component, or with
1883 -- an implicit subtype declaration.
1885 if not Is_Scalar_Type (Etype (Comp)) then
1886 All_Scalar_Components := False;
1888 Scalar_Component_Total_RM_Size :=
1889 Scalar_Component_Total_RM_Size + RM_Size (Etype (Comp));
1890 Scalar_Component_Total_Esize :=
1891 Scalar_Component_Total_Esize + Esize (Etype (Comp));
1894 -- If the component is an Itype with Delayed_Freeze and is either
1895 -- a record or array subtype and its base type has not yet been
1896 -- frozen, we must remove this from the entity list of this record
1897 -- and put it on the entity list of the scope of its base type.
1898 -- Note that we know that this is not the type of a component
1899 -- since we cleared Has_Delayed_Freeze for it in the previous
1900 -- loop. Thus this must be the Designated_Type of an access type,
1901 -- which is the type of a component.
1904 and then Is_Type (Scope (Comp))
1905 and then Is_Composite_Type (Comp)
1906 and then Base_Type (Comp) /= Comp
1907 and then Has_Delayed_Freeze (Comp)
1908 and then not Is_Frozen (Base_Type (Comp))
1911 Will_Be_Frozen : Boolean := False;
1915 -- We have a pretty bad kludge here. Suppose Rec is subtype
1916 -- being defined in a subprogram that's created as part of
1917 -- the freezing of Rec'Base. In that case, we know that
1918 -- Comp'Base must have already been frozen by the time we
1919 -- get to elaborate this because Gigi doesn't elaborate any
1920 -- bodies until it has elaborated all of the declarative
1921 -- part. But Is_Frozen will not be set at this point because
1922 -- we are processing code in lexical order.
1924 -- We detect this case by going up the Scope chain of Rec
1925 -- and seeing if we have a subprogram scope before reaching
1926 -- the top of the scope chain or that of Comp'Base. If we
1927 -- do, then mark that Comp'Base will actually be frozen. If
1928 -- so, we merely undelay it.
1931 while Present (S) loop
1932 if Is_Subprogram (S) then
1933 Will_Be_Frozen := True;
1935 elsif S = Scope (Base_Type (Comp)) then
1942 if Will_Be_Frozen then
1943 Undelay_Type (Comp);
1945 if Present (Prev) then
1946 Set_Next_Entity (Prev, Next_Entity (Comp));
1948 Set_First_Entity (Rec, Next_Entity (Comp));
1951 -- Insert in entity list of scope of base type (which
1952 -- must be an enclosing scope, because still unfrozen).
1954 Append_Entity (Comp, Scope (Base_Type (Comp)));
1958 -- If the component is an access type with an allocator as default
1959 -- value, the designated type will be frozen by the corresponding
1960 -- expression in init_proc. In order to place the freeze node for
1961 -- the designated type before that for the current record type,
1964 -- Same process if the component is an array of access types,
1965 -- initialized with an aggregate. If the designated type is
1966 -- private, it cannot contain allocators, and it is premature
1967 -- to freeze the type, so we check for this as well.
1969 elsif Is_Access_Type (Etype (Comp))
1970 and then Present (Parent (Comp))
1971 and then Present (Expression (Parent (Comp)))
1974 Alloc : constant Node_Id :=
1975 Check_Allocator (Expression (Parent (Comp)));
1978 if Present (Alloc) then
1980 -- If component is pointer to a classwide type, freeze
1981 -- the specific type in the expression being allocated.
1982 -- The expression may be a subtype indication, in which
1983 -- case freeze the subtype mark.
1985 if Is_Class_Wide_Type
1986 (Designated_Type (Etype (Comp)))
1988 if Is_Entity_Name (Expression (Alloc)) then
1990 (Entity (Expression (Alloc)), N, Result);
1992 Nkind (Expression (Alloc)) = N_Subtype_Indication
1995 (Entity (Subtype_Mark (Expression (Alloc))),
1999 elsif Is_Itype (Designated_Type (Etype (Comp))) then
2000 Check_Itype (Etype (Comp));
2004 (Designated_Type (Etype (Comp)), N, Result);
2009 elsif Is_Access_Type (Etype (Comp))
2010 and then Is_Itype (Designated_Type (Etype (Comp)))
2012 Check_Itype (Etype (Comp));
2014 elsif Is_Array_Type (Etype (Comp))
2015 and then Is_Access_Type (Component_Type (Etype (Comp)))
2016 and then Present (Parent (Comp))
2017 and then Nkind (Parent (Comp)) = N_Component_Declaration
2018 and then Present (Expression (Parent (Comp)))
2019 and then Nkind (Expression (Parent (Comp))) = N_Aggregate
2020 and then Is_Fully_Defined
2021 (Designated_Type (Component_Type (Etype (Comp))))
2025 (Component_Type (Etype (Comp))), N, Result);
2032 -- Deal with Bit_Order attribute definition specifying a non-default
2035 if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then
2036 if not Placed_Component then
2038 Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
2039 Error_Msg_N ("?Bit_Order specification has no effect", ADC);
2041 ("\?since no component clauses were specified", ADC);
2043 -- Here is where we do the processing for reversed bit order
2046 Adjust_Record_For_Reverse_Bit_Order (Rec);
2050 -- Complete error checking on record representation clause (e.g.
2051 -- overlap of components). This is called after adjusting the
2052 -- record for reverse bit order.
2055 RRC : constant Node_Id := Get_Record_Representation_Clause (Rec);
2057 if Present (RRC) then
2058 Check_Record_Representation_Clause (RRC);
2062 -- Set OK_To_Reorder_Components depending on debug flags
2064 if Is_Base_Type (Rec) and then Convention (Rec) = Convention_Ada then
2065 if (Has_Discriminants (Rec) and then Debug_Flag_Dot_V)
2067 (not Has_Discriminants (Rec) and then Debug_Flag_Dot_R)
2069 Set_OK_To_Reorder_Components (Rec);
2073 -- Check for useless pragma Pack when all components placed. We only
2074 -- do this check for record types, not subtypes, since a subtype may
2075 -- have all its components placed, and it still makes perfectly good
2076 -- sense to pack other subtypes or the parent type. We do not give
2077 -- this warning if Optimize_Alignment is set to Space, since the
2078 -- pragma Pack does have an effect in this case (it always resets
2079 -- the alignment to one).
2081 if Ekind (Rec) = E_Record_Type
2082 and then Is_Packed (Rec)
2083 and then not Unplaced_Component
2084 and then Optimize_Alignment /= 'S'
2086 -- Reset packed status. Probably not necessary, but we do it so
2087 -- that there is no chance of the back end doing something strange
2088 -- with this redundant indication of packing.
2090 Set_Is_Packed (Rec, False);
2092 -- Give warning if redundant constructs warnings on
2094 if Warn_On_Redundant_Constructs then
2095 Error_Msg_N -- CODEFIX
2096 ("?pragma Pack has no effect, no unplaced components",
2097 Get_Rep_Pragma (Rec, Name_Pack));
2101 -- If this is the record corresponding to a remote type, freeze the
2102 -- remote type here since that is what we are semantically freezing.
2103 -- This prevents the freeze node for that type in an inner scope.
2105 -- Also, Check for controlled components and unchecked unions.
2106 -- Finally, enforce the restriction that access attributes with a
2107 -- current instance prefix can only apply to limited types.
2109 if Ekind (Rec) = E_Record_Type then
2110 if Present (Corresponding_Remote_Type (Rec)) then
2111 Freeze_And_Append (Corresponding_Remote_Type (Rec), N, Result);
2114 Comp := First_Component (Rec);
2115 while Present (Comp) loop
2117 -- Do not set Has_Controlled_Component on a class-wide
2118 -- equivalent type. See Make_CW_Equivalent_Type.
2120 if not Is_Class_Wide_Equivalent_Type (Rec)
2121 and then (Has_Controlled_Component (Etype (Comp))
2122 or else (Chars (Comp) /= Name_uParent
2123 and then Is_Controlled (Etype (Comp)))
2124 or else (Is_Protected_Type (Etype (Comp))
2126 (Corresponding_Record_Type
2128 and then Has_Controlled_Component
2129 (Corresponding_Record_Type
2132 Set_Has_Controlled_Component (Rec);
2136 if Has_Unchecked_Union (Etype (Comp)) then
2137 Set_Has_Unchecked_Union (Rec);
2140 if Has_Per_Object_Constraint (Comp) then
2142 -- Scan component declaration for likely misuses of current
2143 -- instance, either in a constraint or a default expression.
2145 Check_Current_Instance (Parent (Comp));
2148 Next_Component (Comp);
2152 Set_Component_Alignment_If_Not_Set (Rec);
2154 -- For first subtypes, check if there are any fixed-point fields with
2155 -- component clauses, where we must check the size. This is not done
2156 -- till the freeze point, since for fixed-point types, we do not know
2157 -- the size until the type is frozen. Similar processing applies to
2158 -- bit packed arrays.
2160 if Is_First_Subtype (Rec) then
2161 Comp := First_Component (Rec);
2162 while Present (Comp) loop
2163 if Present (Component_Clause (Comp))
2164 and then (Is_Fixed_Point_Type (Etype (Comp))
2166 Is_Bit_Packed_Array (Etype (Comp)))
2169 (Component_Name (Component_Clause (Comp)),
2175 Next_Component (Comp);
2179 -- Generate warning for applying C or C++ convention to a record
2180 -- with discriminants. This is suppressed for the unchecked union
2181 -- case, since the whole point in this case is interface C. We also
2182 -- do not generate this within instantiations, since we will have
2183 -- generated a message on the template.
2185 if Has_Discriminants (E)
2186 and then not Is_Unchecked_Union (E)
2187 and then (Convention (E) = Convention_C
2189 Convention (E) = Convention_CPP)
2190 and then Comes_From_Source (E)
2191 and then not In_Instance
2192 and then not Has_Warnings_Off (E)
2193 and then not Has_Warnings_Off (Base_Type (E))
2196 Cprag : constant Node_Id := Get_Rep_Pragma (E, Name_Convention);
2200 if Present (Cprag) then
2201 A2 := Next (First (Pragma_Argument_Associations (Cprag)));
2203 if Convention (E) = Convention_C then
2205 ("?variant record has no direct equivalent in C", A2);
2208 ("?variant record has no direct equivalent in C++", A2);
2212 ("\?use of convention for type& is dubious", A2, E);
2217 -- See if Size is too small as is (and implicit packing might help)
2219 if not Is_Packed (Rec)
2221 -- No implicit packing if even one component is explicitly placed
2223 and then not Placed_Component
2225 -- Must have size clause and all scalar components
2227 and then Has_Size_Clause (Rec)
2228 and then All_Scalar_Components
2230 -- Do not try implicit packing on records with discriminants, too
2231 -- complicated, especially in the variant record case.
2233 and then not Has_Discriminants (Rec)
2235 -- We can implicitly pack if the specified size of the record is
2236 -- less than the sum of the object sizes (no point in packing if
2237 -- this is not the case).
2239 and then RM_Size (Rec) < Scalar_Component_Total_Esize
2241 -- And the total RM size cannot be greater than the specified size
2242 -- since otherwise packing will not get us where we have to be!
2244 and then RM_Size (Rec) >= Scalar_Component_Total_RM_Size
2246 -- Never do implicit packing in CodePeer mode since we don't do
2247 -- any packing in this mode, since this generates over-complex
2248 -- code that confuses CodePeer, and in general, CodePeer does not
2249 -- care about the internal representation of objects.
2251 and then not CodePeer_Mode
2253 -- If implicit packing enabled, do it
2255 if Implicit_Packing then
2256 Set_Is_Packed (Rec);
2258 -- Otherwise flag the size clause
2262 Sz : constant Node_Id := Size_Clause (Rec);
2264 Error_Msg_NE -- CODEFIX
2265 ("size given for& too small", Sz, Rec);
2266 Error_Msg_N -- CODEFIX
2267 ("\use explicit pragma Pack "
2268 & "or use pragma Implicit_Packing", Sz);
2272 end Freeze_Record_Type;
2274 -- Start of processing for Freeze_Entity
2277 -- We are going to test for various reasons why this entity need not be
2278 -- frozen here, but in the case of an Itype that's defined within a
2279 -- record, that test actually applies to the record.
2281 if Is_Itype (E) and then Is_Record_Type (Scope (E)) then
2282 Test_E := Scope (E);
2283 elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E)))
2284 and then Is_Record_Type (Underlying_Type (Scope (E)))
2286 Test_E := Underlying_Type (Scope (E));
2289 -- Do not freeze if already frozen since we only need one freeze node
2291 if Is_Frozen (E) then
2294 -- It is improper to freeze an external entity within a generic because
2295 -- its freeze node will appear in a non-valid context. The entity will
2296 -- be frozen in the proper scope after the current generic is analyzed.
2298 elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then
2301 -- Do not freeze a global entity within an inner scope created during
2302 -- expansion. A call to subprogram E within some internal procedure
2303 -- (a stream attribute for example) might require freezing E, but the
2304 -- freeze node must appear in the same declarative part as E itself.
2305 -- The two-pass elaboration mechanism in gigi guarantees that E will
2306 -- be frozen before the inner call is elaborated. We exclude constants
2307 -- from this test, because deferred constants may be frozen early, and
2308 -- must be diagnosed (e.g. in the case of a deferred constant being used
2309 -- in a default expression). If the enclosing subprogram comes from
2310 -- source, or is a generic instance, then the freeze point is the one
2311 -- mandated by the language, and we freeze the entity. A subprogram that
2312 -- is a child unit body that acts as a spec does not have a spec that
2313 -- comes from source, but can only come from source.
2315 elsif In_Open_Scopes (Scope (Test_E))
2316 and then Scope (Test_E) /= Current_Scope
2317 and then Ekind (Test_E) /= E_Constant
2324 while Present (S) loop
2325 if Is_Overloadable (S) then
2326 if Comes_From_Source (S)
2327 or else Is_Generic_Instance (S)
2328 or else Is_Child_Unit (S)
2340 -- Similarly, an inlined instance body may make reference to global
2341 -- entities, but these references cannot be the proper freezing point
2342 -- for them, and in the absence of inlining freezing will take place in
2343 -- their own scope. Normally instance bodies are analyzed after the
2344 -- enclosing compilation, and everything has been frozen at the proper
2345 -- place, but with front-end inlining an instance body is compiled
2346 -- before the end of the enclosing scope, and as a result out-of-order
2347 -- freezing must be prevented.
2349 elsif Front_End_Inlining
2350 and then In_Instance_Body
2351 and then Present (Scope (Test_E))
2357 S := Scope (Test_E);
2358 while Present (S) loop
2359 if Is_Generic_Instance (S) then
2372 -- Deal with delayed aspect specifications. The analysis of the aspect
2373 -- is required to be delayed to the freeze point, so we evaluate the
2374 -- pragma or attribute definition clause in the tree at this point.
2376 if Has_Delayed_Aspects (E) then
2382 -- Look for aspect specification entries for this entity
2384 Ritem := First_Rep_Item (E);
2385 while Present (Ritem) loop
2386 if Nkind (Ritem) = N_Aspect_Specification
2387 and then Entity (Ritem) = E
2388 and then Is_Delayed_Aspect (Ritem)
2390 Aitem := Aspect_Rep_Item (Ritem);
2392 -- Skip if this is an aspect with no corresponding pragma
2393 -- or attribute definition node (such as Default_Value).
2395 if Present (Aitem) then
2396 Set_Parent (Aitem, Ritem);
2401 Next_Rep_Item (Ritem);
2406 -- Here to freeze the entity
2410 -- Case of entity being frozen is other than a type
2412 if not Is_Type (E) then
2414 -- If entity is exported or imported and does not have an external
2415 -- name, now is the time to provide the appropriate default name.
2416 -- Skip this if the entity is stubbed, since we don't need a name
2417 -- for any stubbed routine. For the case on intrinsics, if no
2418 -- external name is specified, then calls will be handled in
2419 -- Exp_Intr.Expand_Intrinsic_Call, and no name is needed. If an
2420 -- external name is provided, then Expand_Intrinsic_Call leaves
2421 -- calls in place for expansion by GIGI.
2423 if (Is_Imported (E) or else Is_Exported (E))
2424 and then No (Interface_Name (E))
2425 and then Convention (E) /= Convention_Stubbed
2426 and then Convention (E) /= Convention_Intrinsic
2428 Set_Encoded_Interface_Name
2429 (E, Get_Default_External_Name (E));
2431 -- If entity is an atomic object appearing in a declaration and
2432 -- the expression is an aggregate, assign it to a temporary to
2433 -- ensure that the actual assignment is done atomically rather
2434 -- than component-wise (the assignment to the temp may be done
2435 -- component-wise, but that is harmless).
2438 and then Nkind (Parent (E)) = N_Object_Declaration
2439 and then Present (Expression (Parent (E)))
2440 and then Nkind (Expression (Parent (E))) = N_Aggregate
2441 and then Is_Atomic_Aggregate (Expression (Parent (E)), Etype (E))
2446 -- For a subprogram, freeze all parameter types and also the return
2447 -- type (RM 13.14(14)). However skip this for internal subprograms.
2448 -- This is also the point where any extra formal parameters are
2449 -- created since we now know whether the subprogram will use a
2450 -- foreign convention.
2452 if Is_Subprogram (E) then
2453 if not Is_Internal (E) then
2457 Warn_Node : Node_Id;
2460 -- Loop through formals
2462 Formal := First_Formal (E);
2463 while Present (Formal) loop
2464 F_Type := Etype (Formal);
2466 -- AI05-0151 : incomplete types can appear in a profile.
2467 -- By the time the entity is frozen, the full view must
2468 -- be available, unless it is a limited view.
2470 if Is_Incomplete_Type (F_Type)
2471 and then Present (Full_View (F_Type))
2473 F_Type := Full_View (F_Type);
2474 Set_Etype (Formal, F_Type);
2477 Freeze_And_Append (F_Type, N, Result);
2479 if Is_Private_Type (F_Type)
2480 and then Is_Private_Type (Base_Type (F_Type))
2481 and then No (Full_View (Base_Type (F_Type)))
2482 and then not Is_Generic_Type (F_Type)
2483 and then not Is_Derived_Type (F_Type)
2485 -- If the type of a formal is incomplete, subprogram
2486 -- is being frozen prematurely. Within an instance
2487 -- (but not within a wrapper package) this is an
2488 -- artifact of our need to regard the end of an
2489 -- instantiation as a freeze point. Otherwise it is
2490 -- a definite error.
2493 Set_Is_Frozen (E, False);
2496 elsif not After_Last_Declaration
2497 and then not Freezing_Library_Level_Tagged_Type
2499 Error_Msg_Node_1 := F_Type;
2501 ("type& must be fully defined before this point",
2506 -- Check suspicious parameter for C function. These tests
2507 -- apply only to exported/imported subprograms.
2509 if Warn_On_Export_Import
2510 and then Comes_From_Source (E)
2511 and then (Convention (E) = Convention_C
2513 Convention (E) = Convention_CPP)
2514 and then (Is_Imported (E) or else Is_Exported (E))
2515 and then Convention (E) /= Convention (Formal)
2516 and then not Has_Warnings_Off (E)
2517 and then not Has_Warnings_Off (F_Type)
2518 and then not Has_Warnings_Off (Formal)
2520 -- Qualify mention of formals with subprogram name
2522 Error_Msg_Qual_Level := 1;
2524 -- Check suspicious use of fat C pointer
2526 if Is_Access_Type (F_Type)
2527 and then Esize (F_Type) > Ttypes.System_Address_Size
2530 ("?type of & does not correspond to C pointer!",
2533 -- Check suspicious return of boolean
2535 elsif Root_Type (F_Type) = Standard_Boolean
2536 and then Convention (F_Type) = Convention_Ada
2537 and then not Has_Warnings_Off (F_Type)
2538 and then not Has_Size_Clause (F_Type)
2539 and then VM_Target = No_VM
2541 Error_Msg_N ("& is an 8-bit Ada Boolean?", Formal);
2543 ("\use appropriate corresponding type in C "
2544 & "(e.g. char)?", Formal);
2546 -- Check suspicious tagged type
2548 elsif (Is_Tagged_Type (F_Type)
2549 or else (Is_Access_Type (F_Type)
2552 (Designated_Type (F_Type))))
2553 and then Convention (E) = Convention_C
2556 ("?& involves a tagged type which does not "
2557 & "correspond to any C type!", Formal);
2559 -- Check wrong convention subprogram pointer
2561 elsif Ekind (F_Type) = E_Access_Subprogram_Type
2562 and then not Has_Foreign_Convention (F_Type)
2565 ("?subprogram pointer & should "
2566 & "have foreign convention!", Formal);
2567 Error_Msg_Sloc := Sloc (F_Type);
2569 ("\?add Convention pragma to declaration of &#",
2573 -- Turn off name qualification after message output
2575 Error_Msg_Qual_Level := 0;
2578 -- Check for unconstrained array in exported foreign
2581 if Has_Foreign_Convention (E)
2582 and then not Is_Imported (E)
2583 and then Is_Array_Type (F_Type)
2584 and then not Is_Constrained (F_Type)
2585 and then Warn_On_Export_Import
2587 -- Exclude VM case, since both .NET and JVM can handle
2588 -- unconstrained arrays without a problem.
2590 and then VM_Target = No_VM
2592 Error_Msg_Qual_Level := 1;
2594 -- If this is an inherited operation, place the
2595 -- warning on the derived type declaration, rather
2596 -- than on the original subprogram.
2598 if Nkind (Original_Node (Parent (E))) =
2599 N_Full_Type_Declaration
2601 Warn_Node := Parent (E);
2603 if Formal = First_Formal (E) then
2605 ("?in inherited operation&", Warn_Node, E);
2608 Warn_Node := Formal;
2612 ("?type of argument& is unconstrained array",
2615 ("?foreign caller must pass bounds explicitly",
2617 Error_Msg_Qual_Level := 0;
2620 if not From_With_Type (F_Type) then
2621 if Is_Access_Type (F_Type) then
2622 F_Type := Designated_Type (F_Type);
2625 -- If the formal is an anonymous_access_to_subprogram
2626 -- freeze the subprogram type as well, to prevent
2627 -- scope anomalies in gigi, because there is no other
2628 -- clear point at which it could be frozen.
2630 if Is_Itype (Etype (Formal))
2631 and then Ekind (F_Type) = E_Subprogram_Type
2633 Freeze_And_Append (F_Type, N, Result);
2637 Next_Formal (Formal);
2640 -- Case of function: similar checks on return type
2642 if Ekind (E) = E_Function then
2644 -- Freeze return type
2646 R_Type := Etype (E);
2648 -- AI05-0151: the return type may have been incomplete
2649 -- at the point of declaration.
2651 if Ekind (R_Type) = E_Incomplete_Type
2652 and then Present (Full_View (R_Type))
2654 R_Type := Full_View (R_Type);
2655 Set_Etype (E, R_Type);
2658 Freeze_And_Append (R_Type, N, Result);
2660 -- Check suspicious return type for C function
2662 if Warn_On_Export_Import
2663 and then (Convention (E) = Convention_C
2665 Convention (E) = Convention_CPP)
2666 and then (Is_Imported (E) or else Is_Exported (E))
2668 -- Check suspicious return of fat C pointer
2670 if Is_Access_Type (R_Type)
2671 and then Esize (R_Type) > Ttypes.System_Address_Size
2672 and then not Has_Warnings_Off (E)
2673 and then not Has_Warnings_Off (R_Type)
2676 ("?return type of& does not "
2677 & "correspond to C pointer!", E);
2679 -- Check suspicious return of boolean
2681 elsif Root_Type (R_Type) = Standard_Boolean
2682 and then Convention (R_Type) = Convention_Ada
2683 and then VM_Target = No_VM
2684 and then not Has_Warnings_Off (E)
2685 and then not Has_Warnings_Off (R_Type)
2686 and then not Has_Size_Clause (R_Type)
2689 N : constant Node_Id :=
2690 Result_Definition (Declaration_Node (E));
2693 ("return type of & is an 8-bit Ada Boolean?",
2696 ("\use appropriate corresponding type in C "
2697 & "(e.g. char)?", N, E);
2700 -- Check suspicious return tagged type
2702 elsif (Is_Tagged_Type (R_Type)
2703 or else (Is_Access_Type (R_Type)
2706 (Designated_Type (R_Type))))
2707 and then Convention (E) = Convention_C
2708 and then not Has_Warnings_Off (E)
2709 and then not Has_Warnings_Off (R_Type)
2712 ("?return type of & does not "
2713 & "correspond to C type!", E);
2715 -- Check return of wrong convention subprogram pointer
2717 elsif Ekind (R_Type) = E_Access_Subprogram_Type
2718 and then not Has_Foreign_Convention (R_Type)
2719 and then not Has_Warnings_Off (E)
2720 and then not Has_Warnings_Off (R_Type)
2723 ("?& should return a foreign "
2724 & "convention subprogram pointer", E);
2725 Error_Msg_Sloc := Sloc (R_Type);
2727 ("\?add Convention pragma to declaration of& #",
2732 -- Give warning for suspicious return of a result of an
2733 -- unconstrained array type in a foreign convention
2736 if Has_Foreign_Convention (E)
2738 -- We are looking for a return of unconstrained array
2740 and then Is_Array_Type (R_Type)
2741 and then not Is_Constrained (R_Type)
2743 -- Exclude imported routines, the warning does not
2744 -- belong on the import, but rather on the routine
2747 and then not Is_Imported (E)
2749 -- Exclude VM case, since both .NET and JVM can handle
2750 -- return of unconstrained arrays without a problem.
2752 and then VM_Target = No_VM
2754 -- Check that general warning is enabled, and that it
2755 -- is not suppressed for this particular case.
2757 and then Warn_On_Export_Import
2758 and then not Has_Warnings_Off (E)
2759 and then not Has_Warnings_Off (R_Type)
2762 ("?foreign convention function& should not " &
2763 "return unconstrained array!", E);
2769 -- Must freeze its parent first if it is a derived subprogram
2771 if Present (Alias (E)) then
2772 Freeze_And_Append (Alias (E), N, Result);
2775 -- We don't freeze internal subprograms, because we don't normally
2776 -- want addition of extra formals or mechanism setting to happen
2777 -- for those. However we do pass through predefined dispatching
2778 -- cases, since extra formals may be needed in some cases, such as
2779 -- for the stream 'Input function (build-in-place formals).
2781 if not Is_Internal (E)
2782 or else Is_Predefined_Dispatching_Operation (E)
2784 Freeze_Subprogram (E);
2787 -- Here for other than a subprogram or type
2790 -- If entity has a type, and it is not a generic unit, then
2791 -- freeze it first (RM 13.14(10)).
2793 if Present (Etype (E))
2794 and then Ekind (E) /= E_Generic_Function
2796 Freeze_And_Append (Etype (E), N, Result);
2799 -- Special processing for objects created by object declaration
2801 if Nkind (Declaration_Node (E)) = N_Object_Declaration then
2803 -- Abstract type allowed only for C++ imported variables or
2806 -- Note: we inhibit this check for objects that do not come
2807 -- from source because there is at least one case (the
2808 -- expansion of x'class'input where x is abstract) where we
2809 -- legitimately generate an abstract object.
2811 if Is_Abstract_Type (Etype (E))
2812 and then Comes_From_Source (Parent (E))
2813 and then not (Is_Imported (E)
2814 and then Is_CPP_Class (Etype (E)))
2816 Error_Msg_N ("type of object cannot be abstract",
2817 Object_Definition (Parent (E)));
2819 if Is_CPP_Class (Etype (E)) then
2821 ("\} may need a cpp_constructor",
2822 Object_Definition (Parent (E)), Etype (E));
2826 -- For object created by object declaration, perform required
2827 -- categorization (preelaborate and pure) checks. Defer these
2828 -- checks to freeze time since pragma Import inhibits default
2829 -- initialization and thus pragma Import affects these checks.
2831 Validate_Object_Declaration (Declaration_Node (E));
2833 -- If there is an address clause, check that it is valid
2835 Check_Address_Clause (E);
2837 -- If the object needs any kind of default initialization, an
2838 -- error must be issued if No_Default_Initialization applies.
2839 -- The check doesn't apply to imported objects, which are not
2840 -- ever default initialized, and is why the check is deferred
2841 -- until freezing, at which point we know if Import applies.
2842 -- Deferred constants are also exempted from this test because
2843 -- their completion is explicit, or through an import pragma.
2845 if Ekind (E) = E_Constant
2846 and then Present (Full_View (E))
2850 elsif Comes_From_Source (E)
2851 and then not Is_Imported (E)
2852 and then not Has_Init_Expression (Declaration_Node (E))
2854 ((Has_Non_Null_Base_Init_Proc (Etype (E))
2855 and then not No_Initialization (Declaration_Node (E))
2856 and then not Is_Value_Type (Etype (E))
2857 and then not Initialization_Suppressed (Etype (E)))
2859 (Needs_Simple_Initialization (Etype (E))
2860 and then not Is_Internal (E)))
2862 Has_Default_Initialization := True;
2864 (No_Default_Initialization, Declaration_Node (E));
2867 -- Check that a Thread_Local_Storage variable does not have
2868 -- default initialization, and any explicit initialization must
2869 -- either be the null constant or a static constant.
2871 if Has_Pragma_Thread_Local_Storage (E) then
2873 Decl : constant Node_Id := Declaration_Node (E);
2875 if Has_Default_Initialization
2877 (Has_Init_Expression (Decl)
2879 (No (Expression (Decl))
2881 (Is_Static_Expression (Expression (Decl))
2883 Nkind (Expression (Decl)) = N_Null)))
2886 ("Thread_Local_Storage variable& is "
2887 & "improperly initialized", Decl, E);
2889 ("\only allowed initialization is explicit "
2890 & "NULL or static expression", Decl, E);
2895 -- For imported objects, set Is_Public unless there is also an
2896 -- address clause, which means that there is no external symbol
2897 -- needed for the Import (Is_Public may still be set for other
2898 -- unrelated reasons). Note that we delayed this processing
2899 -- till freeze time so that we can be sure not to set the flag
2900 -- if there is an address clause. If there is such a clause,
2901 -- then the only purpose of the Import pragma is to suppress
2902 -- implicit initialization.
2905 and then No (Address_Clause (E))
2910 -- For convention C objects of an enumeration type, warn if
2911 -- the size is not integer size and no explicit size given.
2912 -- Skip warning for Boolean, and Character, assume programmer
2913 -- expects 8-bit sizes for these cases.
2915 if (Convention (E) = Convention_C
2917 Convention (E) = Convention_CPP)
2918 and then Is_Enumeration_Type (Etype (E))
2919 and then not Is_Character_Type (Etype (E))
2920 and then not Is_Boolean_Type (Etype (E))
2921 and then Esize (Etype (E)) < Standard_Integer_Size
2922 and then not Has_Size_Clause (E)
2924 Error_Msg_Uint_1 := UI_From_Int (Standard_Integer_Size);
2926 ("?convention C enumeration object has size less than ^",
2928 Error_Msg_N ("\?use explicit size clause to set size", E);
2932 -- Check that a constant which has a pragma Volatile[_Components]
2933 -- or Atomic[_Components] also has a pragma Import (RM C.6(13)).
2935 -- Note: Atomic[_Components] also sets Volatile[_Components]
2937 if Ekind (E) = E_Constant
2938 and then (Has_Volatile_Components (E) or else Is_Volatile (E))
2939 and then not Is_Imported (E)
2941 -- Make sure we actually have a pragma, and have not merely
2942 -- inherited the indication from elsewhere (e.g. an address
2943 -- clause, which is not good enough in RM terms!)
2945 if Has_Rep_Pragma (E, Name_Atomic)
2947 Has_Rep_Pragma (E, Name_Atomic_Components)
2950 ("stand alone atomic constant must be " &
2951 "imported (RM C.6(13))", E);
2953 elsif Has_Rep_Pragma (E, Name_Volatile)
2955 Has_Rep_Pragma (E, Name_Volatile_Components)
2958 ("stand alone volatile constant must be " &
2959 "imported (RM C.6(13))", E);
2963 -- Static objects require special handling
2965 if (Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
2966 and then Is_Statically_Allocated (E)
2968 Freeze_Static_Object (E);
2971 -- Remaining step is to layout objects
2973 if Ekind (E) = E_Variable
2975 Ekind (E) = E_Constant
2977 Ekind (E) = E_Loop_Parameter
2985 -- Case of a type or subtype being frozen
2988 -- We used to check here that a full type must have preelaborable
2989 -- initialization if it completes a private type specified with
2990 -- pragma Preelaborable_Initialization, but that missed cases where
2991 -- the types occur within a generic package, since the freezing
2992 -- that occurs within a containing scope generally skips traversal
2993 -- of a generic unit's declarations (those will be frozen within
2994 -- instances). This check was moved to Analyze_Package_Specification.
2996 -- The type may be defined in a generic unit. This can occur when
2997 -- freezing a generic function that returns the type (which is
2998 -- defined in a parent unit). It is clearly meaningless to freeze
2999 -- this type. However, if it is a subtype, its size may be determi-
3000 -- nable and used in subsequent checks, so might as well try to
3003 if Present (Scope (E))
3004 and then Is_Generic_Unit (Scope (E))
3006 Check_Compile_Time_Size (E);
3010 -- Deal with special cases of freezing for subtype
3012 if E /= Base_Type (E) then
3014 -- Before we do anything else, a specialized test for the case of
3015 -- a size given for an array where the array needs to be packed,
3016 -- but was not so the size cannot be honored. This would of course
3017 -- be caught by the backend, and indeed we don't catch all cases.
3018 -- The point is that we can give a better error message in those
3019 -- cases that we do catch with the circuitry here. Also if pragma
3020 -- Implicit_Packing is set, this is where the packing occurs.
3022 -- The reason we do this so early is that the processing in the
3023 -- automatic packing case affects the layout of the base type, so
3024 -- it must be done before we freeze the base type.
3026 if Is_Array_Type (E) then
3029 Ctyp : constant Entity_Id := Component_Type (E);
3032 -- Check enabling conditions. These are straightforward
3033 -- except for the test for a limited composite type. This
3034 -- eliminates the rare case of a array of limited components
3035 -- where there are issues of whether or not we can go ahead
3036 -- and pack the array (since we can't freely pack and unpack
3037 -- arrays if they are limited).
3039 -- Note that we check the root type explicitly because the
3040 -- whole point is we are doing this test before we have had
3041 -- a chance to freeze the base type (and it is that freeze
3042 -- action that causes stuff to be inherited).
3044 if Present (Size_Clause (E))
3045 and then Known_Static_RM_Size (E)
3046 and then not Is_Packed (E)
3047 and then not Has_Pragma_Pack (E)
3048 and then Number_Dimensions (E) = 1
3049 and then not Has_Component_Size_Clause (E)
3050 and then Known_Static_RM_Size (Ctyp)
3051 and then not Is_Limited_Composite (E)
3052 and then not Is_Packed (Root_Type (E))
3053 and then not Has_Component_Size_Clause (Root_Type (E))
3054 and then not CodePeer_Mode
3056 Get_Index_Bounds (First_Index (E), Lo, Hi);
3058 if Compile_Time_Known_Value (Lo)
3059 and then Compile_Time_Known_Value (Hi)
3060 and then Known_Static_RM_Size (Ctyp)
3061 and then RM_Size (Ctyp) < 64
3064 Lov : constant Uint := Expr_Value (Lo);
3065 Hiv : constant Uint := Expr_Value (Hi);
3066 Len : constant Uint := UI_Max
3069 Rsiz : constant Uint := RM_Size (Ctyp);
3070 SZ : constant Node_Id := Size_Clause (E);
3071 Btyp : constant Entity_Id := Base_Type (E);
3073 -- What we are looking for here is the situation where
3074 -- the RM_Size given would be exactly right if there
3075 -- was a pragma Pack (resulting in the component size
3076 -- being the same as the RM_Size). Furthermore, the
3077 -- component type size must be an odd size (not a
3078 -- multiple of storage unit). If the component RM size
3079 -- is an exact number of storage units that is a power
3080 -- of two, the array is not packed and has a standard
3084 if RM_Size (E) = Len * Rsiz
3085 and then Rsiz mod System_Storage_Unit /= 0
3087 -- For implicit packing mode, just set the
3088 -- component size silently.
3090 if Implicit_Packing then
3091 Set_Component_Size (Btyp, Rsiz);
3092 Set_Is_Bit_Packed_Array (Btyp);
3093 Set_Is_Packed (Btyp);
3094 Set_Has_Non_Standard_Rep (Btyp);
3096 -- Otherwise give an error message
3100 ("size given for& too small", SZ, E);
3101 Error_Msg_N -- CODEFIX
3102 ("\use explicit pragma Pack "
3103 & "or use pragma Implicit_Packing", SZ);
3106 elsif RM_Size (E) = Len * Rsiz
3107 and then Implicit_Packing
3109 (Rsiz / System_Storage_Unit = 1
3110 or else Rsiz / System_Storage_Unit = 2
3111 or else Rsiz / System_Storage_Unit = 4)
3114 -- Not a packed array, but indicate the desired
3115 -- component size, for the back-end.
3117 Set_Component_Size (Btyp, Rsiz);
3125 -- If ancestor subtype present, freeze that first. Note that this
3126 -- will also get the base type frozen. Need RM reference ???
3128 Atype := Ancestor_Subtype (E);
3130 if Present (Atype) then
3131 Freeze_And_Append (Atype, N, Result);
3133 -- No ancestor subtype present
3136 -- See if we have a nearest ancestor that has a predicate.
3137 -- That catches the case of derived type with a predicate.
3138 -- Need RM reference here ???
3140 Atype := Nearest_Ancestor (E);
3142 if Present (Atype) and then Has_Predicates (Atype) then
3143 Freeze_And_Append (Atype, N, Result);
3146 -- Freeze base type before freezing the entity (RM 13.14(15))
3148 if E /= Base_Type (E) then
3149 Freeze_And_Append (Base_Type (E), N, Result);
3153 -- For a derived type, freeze its parent type first (RM 13.14(15))
3155 elsif Is_Derived_Type (E) then
3156 Freeze_And_Append (Etype (E), N, Result);
3157 Freeze_And_Append (First_Subtype (Etype (E)), N, Result);
3160 -- For array type, freeze index types and component type first
3161 -- before freezing the array (RM 13.14(15)).
3163 if Is_Array_Type (E) then
3165 FS : constant Entity_Id := First_Subtype (E);
3166 Ctyp : constant Entity_Id := Component_Type (E);
3169 Non_Standard_Enum : Boolean := False;
3170 -- Set true if any of the index types is an enumeration type
3171 -- with a non-standard representation.
3174 Freeze_And_Append (Ctyp, N, Result);
3176 Indx := First_Index (E);
3177 while Present (Indx) loop
3178 Freeze_And_Append (Etype (Indx), N, Result);
3180 if Is_Enumeration_Type (Etype (Indx))
3181 and then Has_Non_Standard_Rep (Etype (Indx))
3183 Non_Standard_Enum := True;
3189 -- Processing that is done only for base types
3191 if Ekind (E) = E_Array_Type then
3193 -- Propagate flags for component type
3195 if Is_Controlled (Component_Type (E))
3196 or else Has_Controlled_Component (Ctyp)
3198 Set_Has_Controlled_Component (E);
3201 if Has_Unchecked_Union (Component_Type (E)) then
3202 Set_Has_Unchecked_Union (E);
3205 -- If packing was requested or if the component size was set
3206 -- explicitly, then see if bit packing is required. This
3207 -- processing is only done for base types, since all the
3208 -- representation aspects involved are type-related. This
3209 -- is not just an optimization, if we start processing the
3210 -- subtypes, they interfere with the settings on the base
3211 -- type (this is because Is_Packed has a slightly different
3212 -- meaning before and after freezing).
3219 if (Is_Packed (E) or else Has_Pragma_Pack (E))
3220 and then Known_Static_RM_Size (Ctyp)
3221 and then not Has_Component_Size_Clause (E)
3223 Csiz := UI_Max (RM_Size (Ctyp), 1);
3225 elsif Known_Component_Size (E) then
3226 Csiz := Component_Size (E);
3228 elsif not Known_Static_Esize (Ctyp) then
3232 Esiz := Esize (Ctyp);
3234 -- We can set the component size if it is less than
3235 -- 16, rounding it up to the next storage unit size.
3239 elsif Esiz <= 16 then
3245 -- Set component size up to match alignment if it
3246 -- would otherwise be less than the alignment. This
3247 -- deals with cases of types whose alignment exceeds
3248 -- their size (padded types).
3252 A : constant Uint := Alignment_In_Bits (Ctyp);
3261 -- Case of component size that may result in packing
3263 if 1 <= Csiz and then Csiz <= 64 then
3265 Ent : constant Entity_Id :=
3267 Pack_Pragma : constant Node_Id :=
3268 Get_Rep_Pragma (Ent, Name_Pack);
3269 Comp_Size_C : constant Node_Id :=
3270 Get_Attribute_Definition_Clause
3271 (Ent, Attribute_Component_Size);
3273 -- Warn if we have pack and component size so that
3274 -- the pack is ignored.
3276 -- Note: here we must check for the presence of a
3277 -- component size before checking for a Pack pragma
3278 -- to deal with the case where the array type is a
3279 -- derived type whose parent is currently private.
3281 if Present (Comp_Size_C)
3282 and then Has_Pragma_Pack (Ent)
3283 and then Warn_On_Redundant_Constructs
3285 Error_Msg_Sloc := Sloc (Comp_Size_C);
3287 ("?pragma Pack for& ignored!",
3290 ("\?explicit component size given#!",
3292 Set_Is_Packed (Base_Type (Ent), False);
3293 Set_Is_Bit_Packed_Array (Base_Type (Ent), False);
3296 -- Set component size if not already set by a
3297 -- component size clause.
3299 if not Present (Comp_Size_C) then
3300 Set_Component_Size (E, Csiz);
3303 -- Check for base type of 8, 16, 32 bits, where an
3304 -- unsigned subtype has a length one less than the
3305 -- base type (e.g. Natural subtype of Integer).
3307 -- In such cases, if a component size was not set
3308 -- explicitly, then generate a warning.
3310 if Has_Pragma_Pack (E)
3311 and then not Present (Comp_Size_C)
3313 (Csiz = 7 or else Csiz = 15 or else Csiz = 31)
3314 and then Esize (Base_Type (Ctyp)) = Csiz + 1
3316 Error_Msg_Uint_1 := Csiz;
3318 if Present (Pack_Pragma) then
3320 ("?pragma Pack causes component size "
3321 & "to be ^!", Pack_Pragma);
3323 ("\?use Component_Size to set "
3324 & "desired value!", Pack_Pragma);
3328 -- Actual packing is not needed for 8, 16, 32, 64.
3329 -- Also not needed for 24 if alignment is 1.
3335 or else (Csiz = 24 and then Alignment (Ctyp) = 1)
3337 -- Here the array was requested to be packed,
3338 -- but the packing request had no effect, so
3339 -- Is_Packed is reset.
3341 -- Note: semantically this means that we lose
3342 -- track of the fact that a derived type
3343 -- inherited a pragma Pack that was non-
3344 -- effective, but that seems fine.
3346 -- We regard a Pack pragma as a request to set
3347 -- a representation characteristic, and this
3348 -- request may be ignored.
3350 Set_Is_Packed (Base_Type (E), False);
3351 Set_Is_Bit_Packed_Array (Base_Type (E), False);
3353 if Known_Static_Esize (Component_Type (E))
3354 and then Esize (Component_Type (E)) = Csiz
3356 Set_Has_Non_Standard_Rep
3357 (Base_Type (E), False);
3360 -- In all other cases, packing is indeed needed
3363 Set_Has_Non_Standard_Rep (Base_Type (E), True);
3364 Set_Is_Bit_Packed_Array (Base_Type (E), True);
3365 Set_Is_Packed (Base_Type (E), True);
3371 -- Check for Atomic_Components or Aliased with unsuitable
3372 -- packing or explicit component size clause given.
3374 if (Has_Atomic_Components (E)
3375 or else Has_Aliased_Components (E))
3376 and then (Has_Component_Size_Clause (E)
3377 or else Is_Packed (E))
3379 Alias_Atomic_Check : declare
3381 procedure Complain_CS (T : String);
3382 -- Outputs error messages for incorrect CS clause or
3383 -- pragma Pack for aliased or atomic components (T is
3384 -- "aliased" or "atomic");
3390 procedure Complain_CS (T : String) is
3392 if Has_Component_Size_Clause (E) then
3394 Get_Attribute_Definition_Clause
3395 (FS, Attribute_Component_Size);
3397 if Known_Static_Esize (Ctyp) then
3399 ("incorrect component size for "
3400 & T & " components", Clause);
3401 Error_Msg_Uint_1 := Esize (Ctyp);
3403 ("\only allowed value is^", Clause);
3407 ("component size cannot be given for "
3408 & T & " components", Clause);
3413 ("cannot pack " & T & " components",
3414 Get_Rep_Pragma (FS, Name_Pack));
3420 -- Start of processing for Alias_Atomic_Check
3424 -- If object size of component type isn't known, we
3425 -- cannot be sure so we defer to the back end.
3427 if not Known_Static_Esize (Ctyp) then
3430 -- Case where component size has no effect. First
3431 -- check for object size of component type multiple
3432 -- of the storage unit size.
3434 elsif Esize (Ctyp) mod System_Storage_Unit = 0
3436 -- OK in both packing case and component size case
3437 -- if RM size is known and static and the same as
3441 ((Known_Static_RM_Size (Ctyp)
3442 and then Esize (Ctyp) = RM_Size (Ctyp))
3444 -- Or if we have an explicit component size
3445 -- clause and the component size and object size
3449 (Has_Component_Size_Clause (E)
3450 and then Component_Size (E) = Esize (Ctyp)))
3454 elsif Has_Aliased_Components (E)
3455 or else Is_Aliased (Ctyp)
3457 Complain_CS ("aliased");
3459 elsif Has_Atomic_Components (E)
3460 or else Is_Atomic (Ctyp)
3462 Complain_CS ("atomic");
3464 end Alias_Atomic_Check;
3467 -- Warn for case of atomic type
3469 Clause := Get_Rep_Pragma (FS, Name_Atomic);
3472 and then not Addressable (Component_Size (FS))
3475 ("non-atomic components of type& may not be "
3476 & "accessible by separate tasks?", Clause, E);
3478 if Has_Component_Size_Clause (E) then
3481 (Get_Attribute_Definition_Clause
3482 (FS, Attribute_Component_Size));
3484 ("\because of component size clause#?",
3487 elsif Has_Pragma_Pack (E) then
3489 Sloc (Get_Rep_Pragma (FS, Name_Pack));
3491 ("\because of pragma Pack#?", Clause);
3495 -- Processing that is done only for subtypes
3498 -- Acquire alignment from base type
3500 if Unknown_Alignment (E) then
3501 Set_Alignment (E, Alignment (Base_Type (E)));
3502 Adjust_Esize_Alignment (E);
3506 -- For bit-packed arrays, check the size
3508 if Is_Bit_Packed_Array (E) and then Known_RM_Size (E) then
3510 SizC : constant Node_Id := Size_Clause (E);
3513 pragma Warnings (Off, Discard);
3516 -- It is not clear if it is possible to have no size
3517 -- clause at this stage, but it is not worth worrying
3518 -- about. Post error on the entity name in the size
3519 -- clause if present, else on the type entity itself.
3521 if Present (SizC) then
3522 Check_Size (Name (SizC), E, RM_Size (E), Discard);
3524 Check_Size (E, E, RM_Size (E), Discard);
3529 -- If any of the index types was an enumeration type with a
3530 -- non-standard rep clause, then we indicate that the array
3531 -- type is always packed (even if it is not bit packed).
3533 if Non_Standard_Enum then
3534 Set_Has_Non_Standard_Rep (Base_Type (E));
3535 Set_Is_Packed (Base_Type (E));
3538 Set_Component_Alignment_If_Not_Set (E);
3540 -- If the array is packed, we must create the packed array
3541 -- type to be used to actually implement the type. This is
3542 -- only needed for real array types (not for string literal
3543 -- types, since they are present only for the front end).
3546 and then Ekind (E) /= E_String_Literal_Subtype
3548 Create_Packed_Array_Type (E);
3549 Freeze_And_Append (Packed_Array_Type (E), N, Result);
3551 -- Size information of packed array type is copied to the
3552 -- array type, since this is really the representation. But
3553 -- do not override explicit existing size values. If the
3554 -- ancestor subtype is constrained the packed_array_type
3555 -- will be inherited from it, but the size may have been
3556 -- provided already, and must not be overridden either.
3558 if not Has_Size_Clause (E)
3560 (No (Ancestor_Subtype (E))
3561 or else not Has_Size_Clause (Ancestor_Subtype (E)))
3563 Set_Esize (E, Esize (Packed_Array_Type (E)));
3564 Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
3567 if not Has_Alignment_Clause (E) then
3568 Set_Alignment (E, Alignment (Packed_Array_Type (E)));
3572 -- For non-packed arrays set the alignment of the array to the
3573 -- alignment of the component type if it is unknown. Skip this
3574 -- in atomic case (atomic arrays may need larger alignments).
3576 if not Is_Packed (E)
3577 and then Unknown_Alignment (E)
3578 and then Known_Alignment (Ctyp)
3579 and then Known_Static_Component_Size (E)
3580 and then Known_Static_Esize (Ctyp)
3581 and then Esize (Ctyp) = Component_Size (E)
3582 and then not Is_Atomic (E)
3584 Set_Alignment (E, Alignment (Component_Type (E)));
3588 -- For a class-wide type, the corresponding specific type is
3589 -- frozen as well (RM 13.14(15))
3591 elsif Is_Class_Wide_Type (E) then
3592 Freeze_And_Append (Root_Type (E), N, Result);
3594 -- If the base type of the class-wide type is still incomplete,
3595 -- the class-wide remains unfrozen as well. This is legal when
3596 -- E is the formal of a primitive operation of some other type
3597 -- which is being frozen.
3599 if not Is_Frozen (Root_Type (E)) then
3600 Set_Is_Frozen (E, False);
3604 -- If the Class_Wide_Type is an Itype (when type is the anonymous
3605 -- parent of a derived type) and it is a library-level entity,
3606 -- generate an itype reference for it. Otherwise, its first
3607 -- explicit reference may be in an inner scope, which will be
3608 -- rejected by the back-end.
3611 and then Is_Compilation_Unit (Scope (E))
3614 Ref : constant Node_Id := Make_Itype_Reference (Loc);
3618 Add_To_Result (Ref);
3622 -- The equivalent type associated with a class-wide subtype needs
3623 -- to be frozen to ensure that its layout is done.
3625 if Ekind (E) = E_Class_Wide_Subtype
3626 and then Present (Equivalent_Type (E))
3628 Freeze_And_Append (Equivalent_Type (E), N, Result);
3631 -- For a record (sub)type, freeze all the component types (RM
3632 -- 13.14(15). We test for E_Record_(sub)Type here, rather than using
3633 -- Is_Record_Type, because we don't want to attempt the freeze for
3634 -- the case of a private type with record extension (we will do that
3635 -- later when the full type is frozen).
3637 elsif Ekind (E) = E_Record_Type
3638 or else Ekind (E) = E_Record_Subtype
3640 Freeze_Record_Type (E);
3642 -- For a concurrent type, freeze corresponding record type. This
3643 -- does not correspond to any specific rule in the RM, but the
3644 -- record type is essentially part of the concurrent type.
3645 -- Freeze as well all local entities. This includes record types
3646 -- created for entry parameter blocks, and whatever local entities
3647 -- may appear in the private part.
3649 elsif Is_Concurrent_Type (E) then
3650 if Present (Corresponding_Record_Type (E)) then
3652 (Corresponding_Record_Type (E), N, Result);
3655 Comp := First_Entity (E);
3656 while Present (Comp) loop
3657 if Is_Type (Comp) then
3658 Freeze_And_Append (Comp, N, Result);
3660 elsif (Ekind (Comp)) /= E_Function then
3661 if Is_Itype (Etype (Comp))
3662 and then Underlying_Type (Scope (Etype (Comp))) = E
3664 Undelay_Type (Etype (Comp));
3667 Freeze_And_Append (Etype (Comp), N, Result);
3673 -- Private types are required to point to the same freeze node as
3674 -- their corresponding full views. The freeze node itself has to
3675 -- point to the partial view of the entity (because from the partial
3676 -- view, we can retrieve the full view, but not the reverse).
3677 -- However, in order to freeze correctly, we need to freeze the full
3678 -- view. If we are freezing at the end of a scope (or within the
3679 -- scope of the private type), the partial and full views will have
3680 -- been swapped, the full view appears first in the entity chain and
3681 -- the swapping mechanism ensures that the pointers are properly set
3684 -- If we encounter the partial view before the full view (e.g. when
3685 -- freezing from another scope), we freeze the full view, and then
3686 -- set the pointers appropriately since we cannot rely on swapping to
3687 -- fix things up (subtypes in an outer scope might not get swapped).
3689 elsif Is_Incomplete_Or_Private_Type (E)
3690 and then not Is_Generic_Type (E)
3692 -- The construction of the dispatch table associated with library
3693 -- level tagged types forces freezing of all the primitives of the
3694 -- type, which may cause premature freezing of the partial view.
3698 -- type T is tagged private;
3699 -- type DT is new T with private;
3700 -- procedure Prim (X : in out T; Y : in out DT'class);
3702 -- type T is tagged null record;
3704 -- type DT is new T with null record;
3707 -- In this case the type will be frozen later by the usual
3708 -- mechanism: an object declaration, an instantiation, or the
3709 -- end of a declarative part.
3711 if Is_Library_Level_Tagged_Type (E)
3712 and then not Present (Full_View (E))
3714 Set_Is_Frozen (E, False);
3717 -- Case of full view present
3719 elsif Present (Full_View (E)) then
3721 -- If full view has already been frozen, then no further
3722 -- processing is required
3724 if Is_Frozen (Full_View (E)) then
3725 Set_Has_Delayed_Freeze (E, False);
3726 Set_Freeze_Node (E, Empty);
3727 Check_Debug_Info_Needed (E);
3729 -- Otherwise freeze full view and patch the pointers so that
3730 -- the freeze node will elaborate both views in the back-end.
3734 Full : constant Entity_Id := Full_View (E);
3737 if Is_Private_Type (Full)
3738 and then Present (Underlying_Full_View (Full))
3741 (Underlying_Full_View (Full), N, Result);
3744 Freeze_And_Append (Full, N, Result);
3746 if Has_Delayed_Freeze (E) then
3747 F_Node := Freeze_Node (Full);
3749 if Present (F_Node) then
3750 Set_Freeze_Node (E, F_Node);
3751 Set_Entity (F_Node, E);
3754 -- {Incomplete,Private}_Subtypes with Full_Views
3755 -- constrained by discriminants.
3757 Set_Has_Delayed_Freeze (E, False);
3758 Set_Freeze_Node (E, Empty);
3763 Check_Debug_Info_Needed (E);
3766 -- AI-117 requires that the convention of a partial view be the
3767 -- same as the convention of the full view. Note that this is a
3768 -- recognized breach of privacy, but it's essential for logical
3769 -- consistency of representation, and the lack of a rule in
3770 -- RM95 was an oversight.
3772 Set_Convention (E, Convention (Full_View (E)));
3774 Set_Size_Known_At_Compile_Time (E,
3775 Size_Known_At_Compile_Time (Full_View (E)));
3777 -- Size information is copied from the full view to the
3778 -- incomplete or private view for consistency.
3780 -- We skip this is the full view is not a type. This is very
3781 -- strange of course, and can only happen as a result of
3782 -- certain illegalities, such as a premature attempt to derive
3783 -- from an incomplete type.
3785 if Is_Type (Full_View (E)) then
3786 Set_Size_Info (E, Full_View (E));
3787 Set_RM_Size (E, RM_Size (Full_View (E)));
3792 -- Case of no full view present. If entity is derived or subtype,
3793 -- it is safe to freeze, correctness depends on the frozen status
3794 -- of parent. Otherwise it is either premature usage, or a Taft
3795 -- amendment type, so diagnosis is at the point of use and the
3796 -- type might be frozen later.
3798 elsif E /= Base_Type (E)
3799 or else Is_Derived_Type (E)
3804 Set_Is_Frozen (E, False);
3808 -- For access subprogram, freeze types of all formals, the return
3809 -- type was already frozen, since it is the Etype of the function.
3810 -- Formal types can be tagged Taft amendment types, but otherwise
3811 -- they cannot be incomplete.
3813 elsif Ekind (E) = E_Subprogram_Type then
3814 Formal := First_Formal (E);
3815 while Present (Formal) loop
3816 if Ekind (Etype (Formal)) = E_Incomplete_Type
3817 and then No (Full_View (Etype (Formal)))
3818 and then not Is_Value_Type (Etype (Formal))
3820 if Is_Tagged_Type (Etype (Formal)) then
3823 -- AI05-151: Incomplete types are allowed in access to
3824 -- subprogram specifications.
3826 elsif Ada_Version < Ada_2012 then
3828 ("invalid use of incomplete type&", E, Etype (Formal));
3832 Freeze_And_Append (Etype (Formal), N, Result);
3833 Next_Formal (Formal);
3836 Freeze_Subprogram (E);
3838 -- For access to a protected subprogram, freeze the equivalent type
3839 -- (however this is not set if we are not generating code or if this
3840 -- is an anonymous type used just for resolution).
3842 elsif Is_Access_Protected_Subprogram_Type (E) then
3843 if Present (Equivalent_Type (E)) then
3844 Freeze_And_Append (Equivalent_Type (E), N, Result);
3848 -- Generic types are never seen by the back-end, and are also not
3849 -- processed by the expander (since the expander is turned off for
3850 -- generic processing), so we never need freeze nodes for them.
3852 if Is_Generic_Type (E) then
3856 -- Some special processing for non-generic types to complete
3857 -- representation details not known till the freeze point.
3859 if Is_Fixed_Point_Type (E) then
3860 Freeze_Fixed_Point_Type (E);
3862 -- Some error checks required for ordinary fixed-point type. Defer
3863 -- these till the freeze-point since we need the small and range
3864 -- values. We only do these checks for base types
3866 if Is_Ordinary_Fixed_Point_Type (E) and then Is_Base_Type (E) then
3867 if Small_Value (E) < Ureal_2_M_80 then
3868 Error_Msg_Name_1 := Name_Small;
3870 ("`&''%` too small, minimum allowed is 2.0'*'*(-80)", E);
3872 elsif Small_Value (E) > Ureal_2_80 then
3873 Error_Msg_Name_1 := Name_Small;
3875 ("`&''%` too large, maximum allowed is 2.0'*'*80", E);
3878 if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then
3879 Error_Msg_Name_1 := Name_First;
3881 ("`&''%` too small, minimum allowed is -10.0'*'*36", E);
3884 if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then
3885 Error_Msg_Name_1 := Name_Last;
3887 ("`&''%` too large, maximum allowed is 10.0'*'*36", E);
3891 elsif Is_Enumeration_Type (E) then
3892 Freeze_Enumeration_Type (E);
3894 elsif Is_Integer_Type (E) then
3895 Adjust_Esize_For_Alignment (E);
3897 if Is_Modular_Integer_Type (E)
3898 and then Warn_On_Suspicious_Modulus_Value
3900 Check_Suspicious_Modulus (E);
3903 elsif Is_Access_Type (E) then
3905 -- If a pragma Default_Storage_Pool applies, and this type has no
3906 -- Storage_Pool or Storage_Size clause (which must have occurred
3907 -- before the freezing point), then use the default. This applies
3908 -- only to base types.
3910 if Present (Default_Pool)
3911 and then Is_Base_Type (E)
3912 and then not Has_Storage_Size_Clause (E)
3913 and then No (Associated_Storage_Pool (E))
3915 -- Case of pragma Default_Storage_Pool (null)
3917 if Nkind (Default_Pool) = N_Null then
3918 Set_No_Pool_Assigned (E);
3920 -- Case of pragma Default_Storage_Pool (storage_pool_NAME)
3923 Set_Associated_Storage_Pool (E, Entity (Default_Pool));
3927 -- Check restriction for standard storage pool
3929 if No (Associated_Storage_Pool (E)) then
3930 Check_Restriction (No_Standard_Storage_Pools, E);
3933 -- Deal with error message for pure access type. This is not an
3934 -- error in Ada 2005 if there is no pool (see AI-366).
3936 if Is_Pure_Unit_Access_Type (E)
3937 and then (Ada_Version < Ada_2005
3938 or else not No_Pool_Assigned (E))
3940 Error_Msg_N ("named access type not allowed in pure unit", E);
3942 if Ada_Version >= Ada_2005 then
3944 ("\would be legal if Storage_Size of 0 given?", E);
3946 elsif No_Pool_Assigned (E) then
3948 ("\would be legal in Ada 2005?", E);
3952 ("\would be legal in Ada 2005 if "
3953 & "Storage_Size of 0 given?", E);
3958 -- Case of composite types
3960 if Is_Composite_Type (E) then
3962 -- AI-117 requires that all new primitives of a tagged type must
3963 -- inherit the convention of the full view of the type. Inherited
3964 -- and overriding operations are defined to inherit the convention
3965 -- of their parent or overridden subprogram (also specified in
3966 -- AI-117), which will have occurred earlier (in Derive_Subprogram
3967 -- and New_Overloaded_Entity). Here we set the convention of
3968 -- primitives that are still convention Ada, which will ensure
3969 -- that any new primitives inherit the type's convention. Class-
3970 -- wide types can have a foreign convention inherited from their
3971 -- specific type, but are excluded from this since they don't have
3972 -- any associated primitives.
3974 if Is_Tagged_Type (E)
3975 and then not Is_Class_Wide_Type (E)
3976 and then Convention (E) /= Convention_Ada
3979 Prim_List : constant Elist_Id := Primitive_Operations (E);
3983 Prim := First_Elmt (Prim_List);
3984 while Present (Prim) loop
3985 if Convention (Node (Prim)) = Convention_Ada then
3986 Set_Convention (Node (Prim), Convention (E));
3995 -- Now that all types from which E may depend are frozen, see if the
3996 -- size is known at compile time, if it must be unsigned, or if
3997 -- strict alignment is required
3999 Check_Compile_Time_Size (E);
4000 Check_Unsigned_Type (E);
4002 if Base_Type (E) = E then
4003 Check_Strict_Alignment (E);
4006 -- Do not allow a size clause for a type which does not have a size
4007 -- that is known at compile time
4009 if Has_Size_Clause (E)
4010 and then not Size_Known_At_Compile_Time (E)
4012 -- Suppress this message if errors posted on E, even if we are
4013 -- in all errors mode, since this is often a junk message
4015 if not Error_Posted (E) then
4017 ("size clause not allowed for variable length type",
4022 -- Now we set/verify the representation information, in particular
4023 -- the size and alignment values. This processing is not required for
4024 -- generic types, since generic types do not play any part in code
4025 -- generation, and so the size and alignment values for such types
4028 if Is_Generic_Type (E) then
4031 -- Otherwise we call the layout procedure
4037 -- If the type has a Defaut_Value/Default_Component_Value aspect,
4038 -- this is where we analye the expression (after the type is frozen,
4039 -- since in the case of Default_Value, we are analyzing with the
4040 -- type itself, and we treat Default_Component_Value similarly for
4041 -- the sake of uniformity.
4043 if Is_First_Subtype (E) and then Has_Default_Aspect (E) then
4051 if Is_Scalar_Type (E) then
4052 Nam := Name_Default_Value;
4055 Nam := Name_Default_Component_Value;
4056 Typ := Component_Type (E);
4059 Aspect := Get_Rep_Item_For_Entity (E, Nam);
4060 Exp := Expression (Aspect);
4061 Analyze_And_Resolve (Exp, Typ);
4063 if Etype (Exp) /= Any_Type then
4064 if not Is_Static_Expression (Exp) then
4065 Error_Msg_Name_1 := Nam;
4066 Flag_Non_Static_Expr
4067 ("aspect% requires static expression", Exp);
4073 -- End of freeze processing for type entities
4076 -- Here is where we logically freeze the current entity. If it has a
4077 -- freeze node, then this is the point at which the freeze node is
4078 -- linked into the result list.
4080 if Has_Delayed_Freeze (E) then
4082 -- If a freeze node is already allocated, use it, otherwise allocate
4083 -- a new one. The preallocation happens in the case of anonymous base
4084 -- types, where we preallocate so that we can set First_Subtype_Link.
4085 -- Note that we reset the Sloc to the current freeze location.
4087 if Present (Freeze_Node (E)) then
4088 F_Node := Freeze_Node (E);
4089 Set_Sloc (F_Node, Loc);
4092 F_Node := New_Node (N_Freeze_Entity, Loc);
4093 Set_Freeze_Node (E, F_Node);
4094 Set_Access_Types_To_Process (F_Node, No_Elist);
4095 Set_TSS_Elist (F_Node, No_Elist);
4096 Set_Actions (F_Node, No_List);
4099 Set_Entity (F_Node, E);
4100 Add_To_Result (F_Node);
4102 -- A final pass over record types with discriminants. If the type
4103 -- has an incomplete declaration, there may be constrained access
4104 -- subtypes declared elsewhere, which do not depend on the discrimi-
4105 -- nants of the type, and which are used as component types (i.e.
4106 -- the full view is a recursive type). The designated types of these
4107 -- subtypes can only be elaborated after the type itself, and they
4108 -- need an itype reference.
4110 if Ekind (E) = E_Record_Type
4111 and then Has_Discriminants (E)
4119 Comp := First_Component (E);
4120 while Present (Comp) loop
4121 Typ := Etype (Comp);
4123 if Ekind (Comp) = E_Component
4124 and then Is_Access_Type (Typ)
4125 and then Scope (Typ) /= E
4126 and then Base_Type (Designated_Type (Typ)) = E
4127 and then Is_Itype (Designated_Type (Typ))
4129 IR := Make_Itype_Reference (Sloc (Comp));
4130 Set_Itype (IR, Designated_Type (Typ));
4131 Append (IR, Result);
4134 Next_Component (Comp);
4140 -- When a type is frozen, the first subtype of the type is frozen as
4141 -- well (RM 13.14(15)). This has to be done after freezing the type,
4142 -- since obviously the first subtype depends on its own base type.
4145 Freeze_And_Append (First_Subtype (E), N, Result);
4147 -- If we just froze a tagged non-class wide record, then freeze the
4148 -- corresponding class-wide type. This must be done after the tagged
4149 -- type itself is frozen, because the class-wide type refers to the
4150 -- tagged type which generates the class.
4152 if Is_Tagged_Type (E)
4153 and then not Is_Class_Wide_Type (E)
4154 and then Present (Class_Wide_Type (E))
4156 Freeze_And_Append (Class_Wide_Type (E), N, Result);
4160 Check_Debug_Info_Needed (E);
4162 -- Special handling for subprograms
4164 if Is_Subprogram (E) then
4166 -- If subprogram has address clause then reset Is_Public flag, since
4167 -- we do not want the backend to generate external references.
4169 if Present (Address_Clause (E))
4170 and then not Is_Library_Level_Entity (E)
4172 Set_Is_Public (E, False);
4174 -- If no address clause and not intrinsic, then for imported
4175 -- subprogram in main unit, generate descriptor if we are in
4176 -- Propagate_Exceptions mode.
4178 -- This is very odd code, it makes a null result, why ???
4180 elsif Propagate_Exceptions
4181 and then Is_Imported (E)
4182 and then not Is_Intrinsic_Subprogram (E)
4183 and then Convention (E) /= Convention_Stubbed
4185 if Result = No_List then
4186 Result := Empty_List;
4194 -----------------------------
4195 -- Freeze_Enumeration_Type --
4196 -----------------------------
4198 procedure Freeze_Enumeration_Type (Typ : Entity_Id) is
4200 -- By default, if no size clause is present, an enumeration type with
4201 -- Convention C is assumed to interface to a C enum, and has integer
4202 -- size. This applies to types. For subtypes, verify that its base
4203 -- type has no size clause either.
4205 if Has_Foreign_Convention (Typ)
4206 and then not Has_Size_Clause (Typ)
4207 and then not Has_Size_Clause (Base_Type (Typ))
4208 and then Esize (Typ) < Standard_Integer_Size
4210 Init_Esize (Typ, Standard_Integer_Size);
4213 -- If the enumeration type interfaces to C, and it has a size clause
4214 -- that specifies less than int size, it warrants a warning. The
4215 -- user may intend the C type to be an enum or a char, so this is
4216 -- not by itself an error that the Ada compiler can detect, but it
4217 -- it is a worth a heads-up. For Boolean and Character types we
4218 -- assume that the programmer has the proper C type in mind.
4220 if Convention (Typ) = Convention_C
4221 and then Has_Size_Clause (Typ)
4222 and then Esize (Typ) /= Esize (Standard_Integer)
4223 and then not Is_Boolean_Type (Typ)
4224 and then not Is_Character_Type (Typ)
4227 ("C enum types have the size of a C int?", Size_Clause (Typ));
4230 Adjust_Esize_For_Alignment (Typ);
4232 end Freeze_Enumeration_Type;
4234 -----------------------
4235 -- Freeze_Expression --
4236 -----------------------
4238 procedure Freeze_Expression (N : Node_Id) is
4239 In_Spec_Exp : constant Boolean := In_Spec_Expression;
4242 Desig_Typ : Entity_Id;
4246 Freeze_Outside : Boolean := False;
4247 -- This flag is set true if the entity must be frozen outside the
4248 -- current subprogram. This happens in the case of expander generated
4249 -- subprograms (_Init_Proc, _Input, _Output, _Read, _Write) which do
4250 -- not freeze all entities like other bodies, but which nevertheless
4251 -- may reference entities that have to be frozen before the body and
4252 -- obviously cannot be frozen inside the body.
4254 function In_Exp_Body (N : Node_Id) return Boolean;
4255 -- Given an N_Handled_Sequence_Of_Statements node N, determines whether
4256 -- it is the handled statement sequence of an expander-generated
4257 -- subprogram (init proc, stream subprogram, or renaming as body).
4258 -- If so, this is not a freezing context.
4264 function In_Exp_Body (N : Node_Id) return Boolean is
4269 if Nkind (N) = N_Subprogram_Body then
4275 if Nkind (P) /= N_Subprogram_Body then
4279 Id := Defining_Unit_Name (Specification (P));
4281 if Nkind (Id) = N_Defining_Identifier
4282 and then (Is_Init_Proc (Id) or else
4283 Is_TSS (Id, TSS_Stream_Input) or else
4284 Is_TSS (Id, TSS_Stream_Output) or else
4285 Is_TSS (Id, TSS_Stream_Read) or else
4286 Is_TSS (Id, TSS_Stream_Write) or else
4287 Nkind (Original_Node (P)) =
4288 N_Subprogram_Renaming_Declaration)
4297 -- Start of processing for Freeze_Expression
4300 -- Immediate return if freezing is inhibited. This flag is set by the
4301 -- analyzer to stop freezing on generated expressions that would cause
4302 -- freezing if they were in the source program, but which are not
4303 -- supposed to freeze, since they are created.
4305 if Must_Not_Freeze (N) then
4309 -- If expression is non-static, then it does not freeze in a default
4310 -- expression, see section "Handling of Default Expressions" in the
4311 -- spec of package Sem for further details. Note that we have to
4312 -- make sure that we actually have a real expression (if we have
4313 -- a subtype indication, we can't test Is_Static_Expression!)
4316 and then Nkind (N) in N_Subexpr
4317 and then not Is_Static_Expression (N)
4322 -- Freeze type of expression if not frozen already
4326 if Nkind (N) in N_Has_Etype then
4327 if not Is_Frozen (Etype (N)) then
4330 -- Base type may be an derived numeric type that is frozen at
4331 -- the point of declaration, but first_subtype is still unfrozen.
4333 elsif not Is_Frozen (First_Subtype (Etype (N))) then
4334 Typ := First_Subtype (Etype (N));
4338 -- For entity name, freeze entity if not frozen already. A special
4339 -- exception occurs for an identifier that did not come from source.
4340 -- We don't let such identifiers freeze a non-internal entity, i.e.
4341 -- an entity that did come from source, since such an identifier was
4342 -- generated by the expander, and cannot have any semantic effect on
4343 -- the freezing semantics. For example, this stops the parameter of
4344 -- an initialization procedure from freezing the variable.
4346 if Is_Entity_Name (N)
4347 and then not Is_Frozen (Entity (N))
4348 and then (Nkind (N) /= N_Identifier
4349 or else Comes_From_Source (N)
4350 or else not Comes_From_Source (Entity (N)))
4357 -- For an allocator freeze designated type if not frozen already
4359 -- For an aggregate whose component type is an access type, freeze the
4360 -- designated type now, so that its freeze does not appear within the
4361 -- loop that might be created in the expansion of the aggregate. If the
4362 -- designated type is a private type without full view, the expression
4363 -- cannot contain an allocator, so the type is not frozen.
4365 -- For a function, we freeze the entity when the subprogram declaration
4366 -- is frozen, but a function call may appear in an initialization proc.
4367 -- before the declaration is frozen. We need to generate the extra
4368 -- formals, if any, to ensure that the expansion of the call includes
4369 -- the proper actuals. This only applies to Ada subprograms, not to
4376 Desig_Typ := Designated_Type (Etype (N));
4379 if Is_Array_Type (Etype (N))
4380 and then Is_Access_Type (Component_Type (Etype (N)))
4382 Desig_Typ := Designated_Type (Component_Type (Etype (N)));
4385 when N_Selected_Component |
4386 N_Indexed_Component |
4389 if Is_Access_Type (Etype (Prefix (N))) then
4390 Desig_Typ := Designated_Type (Etype (Prefix (N)));
4393 when N_Identifier =>
4395 and then Ekind (Nam) = E_Function
4396 and then Nkind (Parent (N)) = N_Function_Call
4397 and then Convention (Nam) = Convention_Ada
4399 Create_Extra_Formals (Nam);
4406 if Desig_Typ /= Empty
4407 and then (Is_Frozen (Desig_Typ)
4408 or else (not Is_Fully_Defined (Desig_Typ)))
4413 -- All done if nothing needs freezing
4417 and then No (Desig_Typ)
4422 -- Loop for looking at the right place to insert the freeze nodes,
4423 -- exiting from the loop when it is appropriate to insert the freeze
4424 -- node before the current node P.
4426 -- Also checks some special exceptions to the freezing rules. These
4427 -- cases result in a direct return, bypassing the freeze action.
4431 Parent_P := Parent (P);
4433 -- If we don't have a parent, then we are not in a well-formed tree.
4434 -- This is an unusual case, but there are some legitimate situations
4435 -- in which this occurs, notably when the expressions in the range of
4436 -- a type declaration are resolved. We simply ignore the freeze
4437 -- request in this case. Is this right ???
4439 if No (Parent_P) then
4443 -- See if we have got to an appropriate point in the tree
4445 case Nkind (Parent_P) is
4447 -- A special test for the exception of (RM 13.14(8)) for the case
4448 -- of per-object expressions (RM 3.8(18)) occurring in component
4449 -- definition or a discrete subtype definition. Note that we test
4450 -- for a component declaration which includes both cases we are
4451 -- interested in, and furthermore the tree does not have explicit
4452 -- nodes for either of these two constructs.
4454 when N_Component_Declaration =>
4456 -- The case we want to test for here is an identifier that is
4457 -- a per-object expression, this is either a discriminant that
4458 -- appears in a context other than the component declaration
4459 -- or it is a reference to the type of the enclosing construct.
4461 -- For either of these cases, we skip the freezing
4463 if not In_Spec_Expression
4464 and then Nkind (N) = N_Identifier
4465 and then (Present (Entity (N)))
4467 -- We recognize the discriminant case by just looking for
4468 -- a reference to a discriminant. It can only be one for
4469 -- the enclosing construct. Skip freezing in this case.
4471 if Ekind (Entity (N)) = E_Discriminant then
4474 -- For the case of a reference to the enclosing record,
4475 -- (or task or protected type), we look for a type that
4476 -- matches the current scope.
4478 elsif Entity (N) = Current_Scope then
4483 -- If we have an enumeration literal that appears as the choice in
4484 -- the aggregate of an enumeration representation clause, then
4485 -- freezing does not occur (RM 13.14(10)).
4487 when N_Enumeration_Representation_Clause =>
4489 -- The case we are looking for is an enumeration literal
4491 if (Nkind (N) = N_Identifier or Nkind (N) = N_Character_Literal)
4492 and then Is_Enumeration_Type (Etype (N))
4494 -- If enumeration literal appears directly as the choice,
4495 -- do not freeze (this is the normal non-overloaded case)
4497 if Nkind (Parent (N)) = N_Component_Association
4498 and then First (Choices (Parent (N))) = N
4502 -- If enumeration literal appears as the name of function
4503 -- which is the choice, then also do not freeze. This
4504 -- happens in the overloaded literal case, where the
4505 -- enumeration literal is temporarily changed to a function
4506 -- call for overloading analysis purposes.
4508 elsif Nkind (Parent (N)) = N_Function_Call
4510 Nkind (Parent (Parent (N))) = N_Component_Association
4512 First (Choices (Parent (Parent (N)))) = Parent (N)
4518 -- Normally if the parent is a handled sequence of statements,
4519 -- then the current node must be a statement, and that is an
4520 -- appropriate place to insert a freeze node.
4522 when N_Handled_Sequence_Of_Statements =>
4524 -- An exception occurs when the sequence of statements is for
4525 -- an expander generated body that did not do the usual freeze
4526 -- all operation. In this case we usually want to freeze
4527 -- outside this body, not inside it, and we skip past the
4528 -- subprogram body that we are inside.
4530 if In_Exp_Body (Parent_P) then
4532 -- However, we *do* want to freeze at this point if we have
4533 -- an entity to freeze, and that entity is declared *inside*
4534 -- the body of the expander generated procedure. This case
4535 -- is recognized by the scope of the type, which is either
4536 -- the spec for some enclosing body, or (in the case of
4537 -- init_procs, for which there are no separate specs) the
4541 Subp : constant Node_Id := Parent (Parent_P);
4545 if Nkind (Subp) = N_Subprogram_Body then
4546 Cspc := Corresponding_Spec (Subp);
4548 if (Present (Typ) and then Scope (Typ) = Cspc)
4550 (Present (Nam) and then Scope (Nam) = Cspc)
4555 and then Scope (Typ) = Current_Scope
4556 and then Current_Scope = Defining_Entity (Subp)
4563 -- If not that exception to the exception, then this is
4564 -- where we delay the freeze till outside the body.
4566 Parent_P := Parent (Parent_P);
4567 Freeze_Outside := True;
4569 -- Here if normal case where we are in handled statement
4570 -- sequence and want to do the insertion right there.
4576 -- If parent is a body or a spec or a block, then the current node
4577 -- is a statement or declaration and we can insert the freeze node
4580 when N_Block_Statement |
4583 N_Package_Specification |
4586 N_Task_Body => exit;
4588 -- The expander is allowed to define types in any statements list,
4589 -- so any of the following parent nodes also mark a freezing point
4590 -- if the actual node is in a list of statements or declarations.
4592 when N_Abortable_Part |
4593 N_Accept_Alternative |
4595 N_Case_Statement_Alternative |
4596 N_Compilation_Unit_Aux |
4597 N_Conditional_Entry_Call |
4598 N_Delay_Alternative |
4600 N_Entry_Call_Alternative |
4601 N_Exception_Handler |
4602 N_Extended_Return_Statement |
4606 N_Selective_Accept |
4607 N_Triggering_Alternative =>
4609 exit when Is_List_Member (P);
4611 -- Note: The N_Loop_Statement is a special case. A type that
4612 -- appears in the source can never be frozen in a loop (this
4613 -- occurs only because of a loop expanded by the expander), so we
4614 -- keep on going. Otherwise we terminate the search. Same is true
4615 -- of any entity which comes from source. (if they have predefined
4616 -- type, that type does not appear to come from source, but the
4617 -- entity should not be frozen here).
4619 when N_Loop_Statement =>
4620 exit when not Comes_From_Source (Etype (N))
4621 and then (No (Nam) or else not Comes_From_Source (Nam));
4623 -- For all other cases, keep looking at parents
4629 -- We fall through the case if we did not yet find the proper
4630 -- place in the free for inserting the freeze node, so climb!
4635 -- If the expression appears in a record or an initialization procedure,
4636 -- the freeze nodes are collected and attached to the current scope, to
4637 -- be inserted and analyzed on exit from the scope, to insure that
4638 -- generated entities appear in the correct scope. If the expression is
4639 -- a default for a discriminant specification, the scope is still void.
4640 -- The expression can also appear in the discriminant part of a private
4641 -- or concurrent type.
4643 -- If the expression appears in a constrained subcomponent of an
4644 -- enclosing record declaration, the freeze nodes must be attached to
4645 -- the outer record type so they can eventually be placed in the
4646 -- enclosing declaration list.
4648 -- The other case requiring this special handling is if we are in a
4649 -- default expression, since in that case we are about to freeze a
4650 -- static type, and the freeze scope needs to be the outer scope, not
4651 -- the scope of the subprogram with the default parameter.
4653 -- For default expressions and other spec expressions in generic units,
4654 -- the Move_Freeze_Nodes mechanism (see sem_ch12.adb) takes care of
4655 -- placing them at the proper place, after the generic unit.
4657 if (In_Spec_Exp and not Inside_A_Generic)
4658 or else Freeze_Outside
4659 or else (Is_Type (Current_Scope)
4660 and then (not Is_Concurrent_Type (Current_Scope)
4661 or else not Has_Completion (Current_Scope)))
4662 or else Ekind (Current_Scope) = E_Void
4665 N : constant Node_Id := Current_Scope;
4666 Freeze_Nodes : List_Id := No_List;
4667 Pos : Int := Scope_Stack.Last;
4670 if Present (Desig_Typ) then
4671 Freeze_And_Append (Desig_Typ, N, Freeze_Nodes);
4674 if Present (Typ) then
4675 Freeze_And_Append (Typ, N, Freeze_Nodes);
4678 if Present (Nam) then
4679 Freeze_And_Append (Nam, N, Freeze_Nodes);
4682 -- The current scope may be that of a constrained component of
4683 -- an enclosing record declaration, which is above the current
4684 -- scope in the scope stack.
4685 -- If the expression is within a top-level pragma, as for a pre-
4686 -- condition on a library-level subprogram, nothing to do.
4688 if not Is_Compilation_Unit (Current_Scope)
4689 and then Is_Record_Type (Scope (Current_Scope))
4694 if Is_Non_Empty_List (Freeze_Nodes) then
4695 if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then
4696 Scope_Stack.Table (Pos).Pending_Freeze_Actions :=
4699 Append_List (Freeze_Nodes,
4700 Scope_Stack.Table (Pos).Pending_Freeze_Actions);
4708 -- Now we have the right place to do the freezing. First, a special
4709 -- adjustment, if we are in spec-expression analysis mode, these freeze
4710 -- actions must not be thrown away (normally all inserted actions are
4711 -- thrown away in this mode. However, the freeze actions are from static
4712 -- expressions and one of the important reasons we are doing this
4713 -- special analysis is to get these freeze actions. Therefore we turn
4714 -- off the In_Spec_Expression mode to propagate these freeze actions.
4715 -- This also means they get properly analyzed and expanded.
4717 In_Spec_Expression := False;
4719 -- Freeze the designated type of an allocator (RM 13.14(13))
4721 if Present (Desig_Typ) then
4722 Freeze_Before (P, Desig_Typ);
4725 -- Freeze type of expression (RM 13.14(10)). Note that we took care of
4726 -- the enumeration representation clause exception in the loop above.
4728 if Present (Typ) then
4729 Freeze_Before (P, Typ);
4732 -- Freeze name if one is present (RM 13.14(11))
4734 if Present (Nam) then
4735 Freeze_Before (P, Nam);
4738 -- Restore In_Spec_Expression flag
4740 In_Spec_Expression := In_Spec_Exp;
4741 end Freeze_Expression;
4743 -----------------------------
4744 -- Freeze_Fixed_Point_Type --
4745 -----------------------------
4747 -- Certain fixed-point types and subtypes, including implicit base types
4748 -- and declared first subtypes, have not yet set up a range. This is
4749 -- because the range cannot be set until the Small and Size values are
4750 -- known, and these are not known till the type is frozen.
4752 -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
4753 -- whose bounds are unanalyzed real literals. This routine will recognize
4754 -- this case, and transform this range node into a properly typed range
4755 -- with properly analyzed and resolved values.
4757 procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is
4758 Rng : constant Node_Id := Scalar_Range (Typ);
4759 Lo : constant Node_Id := Low_Bound (Rng);
4760 Hi : constant Node_Id := High_Bound (Rng);
4761 Btyp : constant Entity_Id := Base_Type (Typ);
4762 Brng : constant Node_Id := Scalar_Range (Btyp);
4763 BLo : constant Node_Id := Low_Bound (Brng);
4764 BHi : constant Node_Id := High_Bound (Brng);
4765 Small : constant Ureal := Small_Value (Typ);
4772 function Fsize (Lov, Hiv : Ureal) return Nat;
4773 -- Returns size of type with given bounds. Also leaves these
4774 -- bounds set as the current bounds of the Typ.
4780 function Fsize (Lov, Hiv : Ureal) return Nat is
4782 Set_Realval (Lo, Lov);
4783 Set_Realval (Hi, Hiv);
4784 return Minimum_Size (Typ);
4787 -- Start of processing for Freeze_Fixed_Point_Type
4790 -- If Esize of a subtype has not previously been set, set it now
4792 if Unknown_Esize (Typ) then
4793 Atype := Ancestor_Subtype (Typ);
4795 if Present (Atype) then
4796 Set_Esize (Typ, Esize (Atype));
4798 Set_Esize (Typ, Esize (Base_Type (Typ)));
4802 -- Immediate return if the range is already analyzed. This means that
4803 -- the range is already set, and does not need to be computed by this
4806 if Analyzed (Rng) then
4810 -- Immediate return if either of the bounds raises Constraint_Error
4812 if Raises_Constraint_Error (Lo)
4813 or else Raises_Constraint_Error (Hi)
4818 Loval := Realval (Lo);
4819 Hival := Realval (Hi);
4821 -- Ordinary fixed-point case
4823 if Is_Ordinary_Fixed_Point_Type (Typ) then
4825 -- For the ordinary fixed-point case, we are allowed to fudge the
4826 -- end-points up or down by small. Generally we prefer to fudge up,
4827 -- i.e. widen the bounds for non-model numbers so that the end points
4828 -- are included. However there are cases in which this cannot be
4829 -- done, and indeed cases in which we may need to narrow the bounds.
4830 -- The following circuit makes the decision.
4832 -- Note: our terminology here is that Incl_EP means that the bounds
4833 -- are widened by Small if necessary to include the end points, and
4834 -- Excl_EP means that the bounds are narrowed by Small to exclude the
4835 -- end-points if this reduces the size.
4837 -- Note that in the Incl case, all we care about is including the
4838 -- end-points. In the Excl case, we want to narrow the bounds as
4839 -- much as permitted by the RM, to give the smallest possible size.
4842 Loval_Incl_EP : Ureal;
4843 Hival_Incl_EP : Ureal;
4845 Loval_Excl_EP : Ureal;
4846 Hival_Excl_EP : Ureal;
4852 First_Subt : Entity_Id;
4857 -- First step. Base types are required to be symmetrical. Right
4858 -- now, the base type range is a copy of the first subtype range.
4859 -- This will be corrected before we are done, but right away we
4860 -- need to deal with the case where both bounds are non-negative.
4861 -- In this case, we set the low bound to the negative of the high
4862 -- bound, to make sure that the size is computed to include the
4863 -- required sign. Note that we do not need to worry about the
4864 -- case of both bounds negative, because the sign will be dealt
4865 -- with anyway. Furthermore we can't just go making such a bound
4866 -- symmetrical, since in a twos-complement system, there is an
4867 -- extra negative value which could not be accommodated on the
4871 and then not UR_Is_Negative (Loval)
4872 and then Hival > Loval
4875 Set_Realval (Lo, Loval);
4878 -- Compute the fudged bounds. If the number is a model number,
4879 -- then we do nothing to include it, but we are allowed to backoff
4880 -- to the next adjacent model number when we exclude it. If it is
4881 -- not a model number then we straddle the two values with the
4882 -- model numbers on either side.
4884 Model_Num := UR_Trunc (Loval / Small) * Small;
4886 if Loval = Model_Num then
4887 Loval_Incl_EP := Model_Num;
4889 Loval_Incl_EP := Model_Num - Small;
4892 -- The low value excluding the end point is Small greater, but
4893 -- we do not do this exclusion if the low value is positive,
4894 -- since it can't help the size and could actually hurt by
4895 -- crossing the high bound.
4897 if UR_Is_Negative (Loval_Incl_EP) then
4898 Loval_Excl_EP := Loval_Incl_EP + Small;
4900 -- If the value went from negative to zero, then we have the
4901 -- case where Loval_Incl_EP is the model number just below
4902 -- zero, so we want to stick to the negative value for the
4903 -- base type to maintain the condition that the size will
4904 -- include signed values.
4907 and then UR_Is_Zero (Loval_Excl_EP)
4909 Loval_Excl_EP := Loval_Incl_EP;
4913 Loval_Excl_EP := Loval_Incl_EP;
4916 -- Similar processing for upper bound and high value
4918 Model_Num := UR_Trunc (Hival / Small) * Small;
4920 if Hival = Model_Num then
4921 Hival_Incl_EP := Model_Num;
4923 Hival_Incl_EP := Model_Num + Small;
4926 if UR_Is_Positive (Hival_Incl_EP) then
4927 Hival_Excl_EP := Hival_Incl_EP - Small;
4929 Hival_Excl_EP := Hival_Incl_EP;
4932 -- One further adjustment is needed. In the case of subtypes, we
4933 -- cannot go outside the range of the base type, or we get
4934 -- peculiarities, and the base type range is already set. This
4935 -- only applies to the Incl values, since clearly the Excl values
4936 -- are already as restricted as they are allowed to be.
4939 Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo));
4940 Hival_Incl_EP := UR_Min (Hival_Incl_EP, Realval (BHi));
4943 -- Get size including and excluding end points
4945 Size_Incl_EP := Fsize (Loval_Incl_EP, Hival_Incl_EP);
4946 Size_Excl_EP := Fsize (Loval_Excl_EP, Hival_Excl_EP);
4948 -- No need to exclude end-points if it does not reduce size
4950 if Fsize (Loval_Incl_EP, Hival_Excl_EP) = Size_Excl_EP then
4951 Loval_Excl_EP := Loval_Incl_EP;
4954 if Fsize (Loval_Excl_EP, Hival_Incl_EP) = Size_Excl_EP then
4955 Hival_Excl_EP := Hival_Incl_EP;
4958 -- Now we set the actual size to be used. We want to use the
4959 -- bounds fudged up to include the end-points but only if this
4960 -- can be done without violating a specifically given size
4961 -- size clause or causing an unacceptable increase in size.
4963 -- Case of size clause given
4965 if Has_Size_Clause (Typ) then
4967 -- Use the inclusive size only if it is consistent with
4968 -- the explicitly specified size.
4970 if Size_Incl_EP <= RM_Size (Typ) then
4971 Actual_Lo := Loval_Incl_EP;
4972 Actual_Hi := Hival_Incl_EP;
4973 Actual_Size := Size_Incl_EP;
4975 -- If the inclusive size is too large, we try excluding
4976 -- the end-points (will be caught later if does not work).
4979 Actual_Lo := Loval_Excl_EP;
4980 Actual_Hi := Hival_Excl_EP;
4981 Actual_Size := Size_Excl_EP;
4984 -- Case of size clause not given
4987 -- If we have a base type whose corresponding first subtype
4988 -- has an explicit size that is large enough to include our
4989 -- end-points, then do so. There is no point in working hard
4990 -- to get a base type whose size is smaller than the specified
4991 -- size of the first subtype.
4993 First_Subt := First_Subtype (Typ);
4995 if Has_Size_Clause (First_Subt)
4996 and then Size_Incl_EP <= Esize (First_Subt)
4998 Actual_Size := Size_Incl_EP;
4999 Actual_Lo := Loval_Incl_EP;
5000 Actual_Hi := Hival_Incl_EP;
5002 -- If excluding the end-points makes the size smaller and
5003 -- results in a size of 8,16,32,64, then we take the smaller
5004 -- size. For the 64 case, this is compulsory. For the other
5005 -- cases, it seems reasonable. We like to include end points
5006 -- if we can, but not at the expense of moving to the next
5007 -- natural boundary of size.
5009 elsif Size_Incl_EP /= Size_Excl_EP
5010 and then Addressable (Size_Excl_EP)
5012 Actual_Size := Size_Excl_EP;
5013 Actual_Lo := Loval_Excl_EP;
5014 Actual_Hi := Hival_Excl_EP;
5016 -- Otherwise we can definitely include the end points
5019 Actual_Size := Size_Incl_EP;
5020 Actual_Lo := Loval_Incl_EP;
5021 Actual_Hi := Hival_Incl_EP;
5024 -- One pathological case: normally we never fudge a low bound
5025 -- down, since it would seem to increase the size (if it has
5026 -- any effect), but for ranges containing single value, or no
5027 -- values, the high bound can be small too large. Consider:
5029 -- type t is delta 2.0**(-14)
5030 -- range 131072.0 .. 0;
5032 -- That lower bound is *just* outside the range of 32 bits, and
5033 -- does need fudging down in this case. Note that the bounds
5034 -- will always have crossed here, since the high bound will be
5035 -- fudged down if necessary, as in the case of:
5037 -- type t is delta 2.0**(-14)
5038 -- range 131072.0 .. 131072.0;
5040 -- So we detect the situation by looking for crossed bounds,
5041 -- and if the bounds are crossed, and the low bound is greater
5042 -- than zero, we will always back it off by small, since this
5043 -- is completely harmless.
5045 if Actual_Lo > Actual_Hi then
5046 if UR_Is_Positive (Actual_Lo) then
5047 Actual_Lo := Loval_Incl_EP - Small;
5048 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5050 -- And of course, we need to do exactly the same parallel
5051 -- fudge for flat ranges in the negative region.
5053 elsif UR_Is_Negative (Actual_Hi) then
5054 Actual_Hi := Hival_Incl_EP + Small;
5055 Actual_Size := Fsize (Actual_Lo, Actual_Hi);
5060 Set_Realval (Lo, Actual_Lo);
5061 Set_Realval (Hi, Actual_Hi);
5064 -- For the decimal case, none of this fudging is required, since there
5065 -- are no end-point problems in the decimal case (the end-points are
5066 -- always included).
5069 Actual_Size := Fsize (Loval, Hival);
5072 -- At this stage, the actual size has been calculated and the proper
5073 -- required bounds are stored in the low and high bounds.
5075 if Actual_Size > 64 then
5076 Error_Msg_Uint_1 := UI_From_Int (Actual_Size);
5078 ("size required (^) for type& too large, maximum allowed is 64",
5083 -- Check size against explicit given size
5085 if Has_Size_Clause (Typ) then
5086 if Actual_Size > RM_Size (Typ) then
5087 Error_Msg_Uint_1 := RM_Size (Typ);
5088 Error_Msg_Uint_2 := UI_From_Int (Actual_Size);
5090 ("size given (^) for type& too small, minimum allowed is ^",
5091 Size_Clause (Typ), Typ);
5094 Actual_Size := UI_To_Int (Esize (Typ));
5097 -- Increase size to next natural boundary if no size clause given
5100 if Actual_Size <= 8 then
5102 elsif Actual_Size <= 16 then
5104 elsif Actual_Size <= 32 then
5110 Init_Esize (Typ, Actual_Size);
5111 Adjust_Esize_For_Alignment (Typ);
5114 -- If we have a base type, then expand the bounds so that they extend to
5115 -- the full width of the allocated size in bits, to avoid junk range
5116 -- checks on intermediate computations.
5118 if Base_Type (Typ) = Typ then
5119 Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1))));
5120 Set_Realval (Hi, (Small * (Uint_2 ** (Actual_Size - 1) - 1)));
5123 -- Final step is to reanalyze the bounds using the proper type
5124 -- and set the Corresponding_Integer_Value fields of the literals.
5126 Set_Etype (Lo, Empty);
5127 Set_Analyzed (Lo, False);
5130 -- Resolve with universal fixed if the base type, and the base type if
5131 -- it is a subtype. Note we can't resolve the base type with itself,
5132 -- that would be a reference before definition.
5135 Resolve (Lo, Universal_Fixed);
5140 -- Set corresponding integer value for bound
5142 Set_Corresponding_Integer_Value
5143 (Lo, UR_To_Uint (Realval (Lo) / Small));
5145 -- Similar processing for high bound
5147 Set_Etype (Hi, Empty);
5148 Set_Analyzed (Hi, False);
5152 Resolve (Hi, Universal_Fixed);
5157 Set_Corresponding_Integer_Value
5158 (Hi, UR_To_Uint (Realval (Hi) / Small));
5160 -- Set type of range to correspond to bounds
5162 Set_Etype (Rng, Etype (Lo));
5164 -- Set Esize to calculated size if not set already
5166 if Unknown_Esize (Typ) then
5167 Init_Esize (Typ, Actual_Size);
5170 -- Set RM_Size if not already set. If already set, check value
5173 Minsiz : constant Uint := UI_From_Int (Minimum_Size (Typ));
5176 if RM_Size (Typ) /= Uint_0 then
5177 if RM_Size (Typ) < Minsiz then
5178 Error_Msg_Uint_1 := RM_Size (Typ);
5179 Error_Msg_Uint_2 := Minsiz;
5181 ("size given (^) for type& too small, minimum allowed is ^",
5182 Size_Clause (Typ), Typ);
5186 Set_RM_Size (Typ, Minsiz);
5189 end Freeze_Fixed_Point_Type;
5195 procedure Freeze_Itype (T : Entity_Id; N : Node_Id) is
5199 Set_Has_Delayed_Freeze (T);
5200 L := Freeze_Entity (T, N);
5202 if Is_Non_Empty_List (L) then
5203 Insert_Actions (N, L);
5207 --------------------------
5208 -- Freeze_Static_Object --
5209 --------------------------
5211 procedure Freeze_Static_Object (E : Entity_Id) is
5213 Cannot_Be_Static : exception;
5214 -- Exception raised if the type of a static object cannot be made
5215 -- static. This happens if the type depends on non-global objects.
5217 procedure Ensure_Expression_Is_SA (N : Node_Id);
5218 -- Called to ensure that an expression used as part of a type definition
5219 -- is statically allocatable, which means that the expression type is
5220 -- statically allocatable, and the expression is either static, or a
5221 -- reference to a library level constant.
5223 procedure Ensure_Type_Is_SA (Typ : Entity_Id);
5224 -- Called to mark a type as static, checking that it is possible
5225 -- to set the type as static. If it is not possible, then the
5226 -- exception Cannot_Be_Static is raised.
5228 -----------------------------
5229 -- Ensure_Expression_Is_SA --
5230 -----------------------------
5232 procedure Ensure_Expression_Is_SA (N : Node_Id) is
5236 Ensure_Type_Is_SA (Etype (N));
5238 if Is_Static_Expression (N) then
5241 elsif Nkind (N) = N_Identifier then
5245 and then Ekind (Ent) = E_Constant
5246 and then Is_Library_Level_Entity (Ent)
5252 raise Cannot_Be_Static;
5253 end Ensure_Expression_Is_SA;
5255 -----------------------
5256 -- Ensure_Type_Is_SA --
5257 -----------------------
5259 procedure Ensure_Type_Is_SA (Typ : Entity_Id) is
5264 -- If type is library level, we are all set
5266 if Is_Library_Level_Entity (Typ) then
5270 -- We are also OK if the type already marked as statically allocated,
5271 -- which means we processed it before.
5273 if Is_Statically_Allocated (Typ) then
5277 -- Mark type as statically allocated
5279 Set_Is_Statically_Allocated (Typ);
5281 -- Check that it is safe to statically allocate this type
5283 if Is_Scalar_Type (Typ) or else Is_Real_Type (Typ) then
5284 Ensure_Expression_Is_SA (Type_Low_Bound (Typ));
5285 Ensure_Expression_Is_SA (Type_High_Bound (Typ));
5287 elsif Is_Array_Type (Typ) then
5288 N := First_Index (Typ);
5289 while Present (N) loop
5290 Ensure_Type_Is_SA (Etype (N));
5294 Ensure_Type_Is_SA (Component_Type (Typ));
5296 elsif Is_Access_Type (Typ) then
5297 if Ekind (Designated_Type (Typ)) = E_Subprogram_Type then
5301 T : constant Entity_Id := Etype (Designated_Type (Typ));
5304 if T /= Standard_Void_Type then
5305 Ensure_Type_Is_SA (T);
5308 F := First_Formal (Designated_Type (Typ));
5309 while Present (F) loop
5310 Ensure_Type_Is_SA (Etype (F));
5316 Ensure_Type_Is_SA (Designated_Type (Typ));
5319 elsif Is_Record_Type (Typ) then
5320 C := First_Entity (Typ);
5321 while Present (C) loop
5322 if Ekind (C) = E_Discriminant
5323 or else Ekind (C) = E_Component
5325 Ensure_Type_Is_SA (Etype (C));
5327 elsif Is_Type (C) then
5328 Ensure_Type_Is_SA (C);
5334 elsif Ekind (Typ) = E_Subprogram_Type then
5335 Ensure_Type_Is_SA (Etype (Typ));
5337 C := First_Formal (Typ);
5338 while Present (C) loop
5339 Ensure_Type_Is_SA (Etype (C));
5344 raise Cannot_Be_Static;
5346 end Ensure_Type_Is_SA;
5348 -- Start of processing for Freeze_Static_Object
5351 Ensure_Type_Is_SA (Etype (E));
5354 when Cannot_Be_Static =>
5356 -- If the object that cannot be static is imported or exported, then
5357 -- issue an error message saying that this object cannot be imported
5358 -- or exported. If it has an address clause it is an overlay in the
5359 -- current partition and the static requirement is not relevant.
5360 -- Do not issue any error message when ignoring rep clauses.
5362 if Ignore_Rep_Clauses then
5365 elsif Is_Imported (E) then
5366 if No (Address_Clause (E)) then
5368 ("& cannot be imported (local type is not constant)", E);
5371 -- Otherwise must be exported, something is wrong if compiler
5372 -- is marking something as statically allocated which cannot be).
5374 else pragma Assert (Is_Exported (E));
5376 ("& cannot be exported (local type is not constant)", E);
5378 end Freeze_Static_Object;
5380 -----------------------
5381 -- Freeze_Subprogram --
5382 -----------------------
5384 procedure Freeze_Subprogram (E : Entity_Id) is
5389 -- Subprogram may not have an address clause unless it is imported
5391 if Present (Address_Clause (E)) then
5392 if not Is_Imported (E) then
5394 ("address clause can only be given " &
5395 "for imported subprogram",
5396 Name (Address_Clause (E)));
5400 -- Reset the Pure indication on an imported subprogram unless an
5401 -- explicit Pure_Function pragma was present. We do this because
5402 -- otherwise it is an insidious error to call a non-pure function from
5403 -- pure unit and have calls mysteriously optimized away. What happens
5404 -- here is that the Import can bypass the normal check to ensure that
5405 -- pure units call only pure subprograms.
5408 and then Is_Pure (E)
5409 and then not Has_Pragma_Pure_Function (E)
5411 Set_Is_Pure (E, False);
5414 -- For non-foreign convention subprograms, this is where we create
5415 -- the extra formals (for accessibility level and constrained bit
5416 -- information). We delay this till the freeze point precisely so
5417 -- that we know the convention!
5419 if not Has_Foreign_Convention (E) then
5420 Create_Extra_Formals (E);
5423 -- If this is convention Ada and a Valued_Procedure, that's odd
5425 if Ekind (E) = E_Procedure
5426 and then Is_Valued_Procedure (E)
5427 and then Convention (E) = Convention_Ada
5428 and then Warn_On_Export_Import
5431 ("?Valued_Procedure has no effect for convention Ada", E);
5432 Set_Is_Valued_Procedure (E, False);
5435 -- Case of foreign convention
5440 -- For foreign conventions, warn about return of an
5441 -- unconstrained array.
5443 -- Note: we *do* allow a return by descriptor for the VMS case,
5444 -- though here there is probably more to be done ???
5446 if Ekind (E) = E_Function then
5447 Retype := Underlying_Type (Etype (E));
5449 -- If no return type, probably some other error, e.g. a
5450 -- missing full declaration, so ignore.
5455 -- If the return type is generic, we have emitted a warning
5456 -- earlier on, and there is nothing else to check here. Specific
5457 -- instantiations may lead to erroneous behavior.
5459 elsif Is_Generic_Type (Etype (E)) then
5462 -- Display warning if returning unconstrained array
5464 elsif Is_Array_Type (Retype)
5465 and then not Is_Constrained (Retype)
5467 -- Exclude cases where descriptor mechanism is set, since the
5468 -- VMS descriptor mechanisms allow such unconstrained returns.
5470 and then Mechanism (E) not in Descriptor_Codes
5472 -- Check appropriate warning is enabled (should we check for
5473 -- Warnings (Off) on specific entities here, probably so???)
5475 and then Warn_On_Export_Import
5477 -- Exclude the VM case, since return of unconstrained arrays
5478 -- is properly handled in both the JVM and .NET cases.
5480 and then VM_Target = No_VM
5483 ("?foreign convention function& should not return " &
5484 "unconstrained array", E);
5489 -- If any of the formals for an exported foreign convention
5490 -- subprogram have defaults, then emit an appropriate warning since
5491 -- this is odd (default cannot be used from non-Ada code)
5493 if Is_Exported (E) then
5494 F := First_Formal (E);
5495 while Present (F) loop
5496 if Warn_On_Export_Import
5497 and then Present (Default_Value (F))
5500 ("?parameter cannot be defaulted in non-Ada call",
5509 -- For VMS, descriptor mechanisms for parameters are allowed only for
5510 -- imported/exported subprograms. Moreover, the NCA descriptor is not
5511 -- allowed for parameters of exported subprograms.
5513 if OpenVMS_On_Target then
5514 if Is_Exported (E) then
5515 F := First_Formal (E);
5516 while Present (F) loop
5517 if Mechanism (F) = By_Descriptor_NCA then
5519 ("'N'C'A' descriptor for parameter not permitted", F);
5521 ("\can only be used for imported subprogram", F);
5527 elsif not Is_Imported (E) then
5528 F := First_Formal (E);
5529 while Present (F) loop
5530 if Mechanism (F) in Descriptor_Codes then
5532 ("descriptor mechanism for parameter not permitted", F);
5534 ("\can only be used for imported/exported subprogram", F);
5542 -- Pragma Inline_Always is disallowed for dispatching subprograms
5543 -- because the address of such subprograms is saved in the dispatch
5544 -- table to support dispatching calls, and dispatching calls cannot
5545 -- be inlined. This is consistent with the restriction against using
5546 -- 'Access or 'Address on an Inline_Always subprogram.
5548 if Is_Dispatching_Operation (E)
5549 and then Has_Pragma_Inline_Always (E)
5552 ("pragma Inline_Always not allowed for dispatching subprograms", E);
5555 -- Because of the implicit representation of inherited predefined
5556 -- operators in the front-end, the overriding status of the operation
5557 -- may be affected when a full view of a type is analyzed, and this is
5558 -- not captured by the analysis of the corresponding type declaration.
5559 -- Therefore the correctness of a not-overriding indicator must be
5560 -- rechecked when the subprogram is frozen.
5562 if Nkind (E) = N_Defining_Operator_Symbol
5563 and then not Error_Posted (Parent (E))
5565 Check_Overriding_Indicator (E, Empty, Is_Primitive (E));
5567 end Freeze_Subprogram;
5569 ----------------------
5570 -- Is_Fully_Defined --
5571 ----------------------
5573 function Is_Fully_Defined (T : Entity_Id) return Boolean is
5575 if Ekind (T) = E_Class_Wide_Type then
5576 return Is_Fully_Defined (Etype (T));
5578 elsif Is_Array_Type (T) then
5579 return Is_Fully_Defined (Component_Type (T));
5581 elsif Is_Record_Type (T)
5582 and not Is_Private_Type (T)
5584 -- Verify that the record type has no components with private types
5585 -- without completion.
5591 Comp := First_Component (T);
5592 while Present (Comp) loop
5593 if not Is_Fully_Defined (Etype (Comp)) then
5597 Next_Component (Comp);
5602 -- For the designated type of an access to subprogram, all types in
5603 -- the profile must be fully defined.
5605 elsif Ekind (T) = E_Subprogram_Type then
5610 F := First_Formal (T);
5611 while Present (F) loop
5612 if not Is_Fully_Defined (Etype (F)) then
5619 return Is_Fully_Defined (Etype (T));
5623 return not Is_Private_Type (T)
5624 or else Present (Full_View (Base_Type (T)));
5626 end Is_Fully_Defined;
5628 ---------------------------------
5629 -- Process_Default_Expressions --
5630 ---------------------------------
5632 procedure Process_Default_Expressions
5634 After : in out Node_Id)
5636 Loc : constant Source_Ptr := Sloc (E);
5643 Set_Default_Expressions_Processed (E);
5645 -- A subprogram instance and its associated anonymous subprogram share
5646 -- their signature. The default expression functions are defined in the
5647 -- wrapper packages for the anonymous subprogram, and should not be
5648 -- generated again for the instance.
5650 if Is_Generic_Instance (E)
5651 and then Present (Alias (E))
5652 and then Default_Expressions_Processed (Alias (E))
5657 Formal := First_Formal (E);
5658 while Present (Formal) loop
5659 if Present (Default_Value (Formal)) then
5661 -- We work with a copy of the default expression because we
5662 -- do not want to disturb the original, since this would mess
5663 -- up the conformance checking.
5665 Dcopy := New_Copy_Tree (Default_Value (Formal));
5667 -- The analysis of the expression may generate insert actions,
5668 -- which of course must not be executed. We wrap those actions
5669 -- in a procedure that is not called, and later on eliminated.
5670 -- The following cases have no side-effects, and are analyzed
5673 if Nkind (Dcopy) = N_Identifier
5674 or else Nkind (Dcopy) = N_Expanded_Name
5675 or else Nkind (Dcopy) = N_Integer_Literal
5676 or else (Nkind (Dcopy) = N_Real_Literal
5677 and then not Vax_Float (Etype (Dcopy)))
5678 or else Nkind (Dcopy) = N_Character_Literal
5679 or else Nkind (Dcopy) = N_String_Literal
5680 or else Known_Null (Dcopy)
5681 or else (Nkind (Dcopy) = N_Attribute_Reference
5683 Attribute_Name (Dcopy) = Name_Null_Parameter)
5686 -- If there is no default function, we must still do a full
5687 -- analyze call on the default value, to ensure that all error
5688 -- checks are performed, e.g. those associated with static
5689 -- evaluation. Note: this branch will always be taken if the
5690 -- analyzer is turned off (but we still need the error checks).
5692 -- Note: the setting of parent here is to meet the requirement
5693 -- that we can only analyze the expression while attached to
5694 -- the tree. Really the requirement is that the parent chain
5695 -- be set, we don't actually need to be in the tree.
5697 Set_Parent (Dcopy, Declaration_Node (Formal));
5700 -- Default expressions are resolved with their own type if the
5701 -- context is generic, to avoid anomalies with private types.
5703 if Ekind (Scope (E)) = E_Generic_Package then
5706 Resolve (Dcopy, Etype (Formal));
5709 -- If that resolved expression will raise constraint error,
5710 -- then flag the default value as raising constraint error.
5711 -- This allows a proper error message on the calls.
5713 if Raises_Constraint_Error (Dcopy) then
5714 Set_Raises_Constraint_Error (Default_Value (Formal));
5717 -- If the default is a parameterless call, we use the name of
5718 -- the called function directly, and there is no body to build.
5720 elsif Nkind (Dcopy) = N_Function_Call
5721 and then No (Parameter_Associations (Dcopy))
5725 -- Else construct and analyze the body of a wrapper procedure
5726 -- that contains an object declaration to hold the expression.
5727 -- Given that this is done only to complete the analysis, it
5728 -- simpler to build a procedure than a function which might
5729 -- involve secondary stack expansion.
5732 Dnam := Make_Temporary (Loc, 'D');
5735 Make_Subprogram_Body (Loc,
5737 Make_Procedure_Specification (Loc,
5738 Defining_Unit_Name => Dnam),
5740 Declarations => New_List (
5741 Make_Object_Declaration (Loc,
5742 Defining_Identifier => Make_Temporary (Loc, 'T'),
5743 Object_Definition =>
5744 New_Occurrence_Of (Etype (Formal), Loc),
5745 Expression => New_Copy_Tree (Dcopy))),
5747 Handled_Statement_Sequence =>
5748 Make_Handled_Sequence_Of_Statements (Loc,
5749 Statements => Empty_List));
5751 Set_Scope (Dnam, Scope (E));
5752 Set_Assignment_OK (First (Declarations (Dbody)));
5753 Set_Is_Eliminated (Dnam);
5754 Insert_After (After, Dbody);
5760 Next_Formal (Formal);
5762 end Process_Default_Expressions;
5764 ----------------------------------------
5765 -- Set_Component_Alignment_If_Not_Set --
5766 ----------------------------------------
5768 procedure Set_Component_Alignment_If_Not_Set (Typ : Entity_Id) is
5770 -- Ignore if not base type, subtypes don't need anything
5772 if Typ /= Base_Type (Typ) then
5776 -- Do not override existing representation
5778 if Is_Packed (Typ) then
5781 elsif Has_Specified_Layout (Typ) then
5784 elsif Component_Alignment (Typ) /= Calign_Default then
5788 Set_Component_Alignment
5789 (Typ, Scope_Stack.Table
5790 (Scope_Stack.Last).Component_Alignment_Default);
5792 end Set_Component_Alignment_If_Not_Set;
5798 procedure Undelay_Type (T : Entity_Id) is
5800 Set_Has_Delayed_Freeze (T, False);
5801 Set_Freeze_Node (T, Empty);
5803 -- Since we don't want T to have a Freeze_Node, we don't want its
5804 -- Full_View or Corresponding_Record_Type to have one either.
5806 -- ??? Fundamentally, this whole handling is a kludge. What we really
5807 -- want is to be sure that for an Itype that's part of record R and is a
5808 -- subtype of type T, that it's frozen after the later of the freeze
5809 -- points of R and T. We have no way of doing that directly, so what we
5810 -- do is force most such Itypes to be frozen as part of freezing R via
5811 -- this procedure and only delay the ones that need to be delayed
5812 -- (mostly the designated types of access types that are defined as part
5815 if Is_Private_Type (T)
5816 and then Present (Full_View (T))
5817 and then Is_Itype (Full_View (T))
5818 and then Is_Record_Type (Scope (Full_View (T)))
5820 Undelay_Type (Full_View (T));
5823 if Is_Concurrent_Type (T)
5824 and then Present (Corresponding_Record_Type (T))
5825 and then Is_Itype (Corresponding_Record_Type (T))
5826 and then Is_Record_Type (Scope (Corresponding_Record_Type (T)))
5828 Undelay_Type (Corresponding_Record_Type (T));
5836 procedure Warn_Overlay
5841 Ent : constant Entity_Id := Entity (Nam);
5842 -- The object to which the address clause applies
5845 Old : Entity_Id := Empty;
5849 -- No warning if address clause overlay warnings are off
5851 if not Address_Clause_Overlay_Warnings then
5855 -- No warning if there is an explicit initialization
5857 Init := Original_Node (Expression (Declaration_Node (Ent)));
5859 if Present (Init) and then Comes_From_Source (Init) then
5863 -- We only give the warning for non-imported entities of a type for
5864 -- which a non-null base init proc is defined, or for objects of access
5865 -- types with implicit null initialization, or when Normalize_Scalars
5866 -- applies and the type is scalar or a string type (the latter being
5867 -- tested for because predefined String types are initialized by inline
5868 -- code rather than by an init_proc). Note that we do not give the
5869 -- warning for Initialize_Scalars, since we suppressed initialization
5870 -- in this case. Also, do not warn if Suppress_Initialization is set.
5873 and then not Is_Imported (Ent)
5874 and then not Initialization_Suppressed (Typ)
5875 and then (Has_Non_Null_Base_Init_Proc (Typ)
5876 or else Is_Access_Type (Typ)
5877 or else (Normalize_Scalars
5878 and then (Is_Scalar_Type (Typ)
5879 or else Is_String_Type (Typ))))
5881 if Nkind (Expr) = N_Attribute_Reference
5882 and then Is_Entity_Name (Prefix (Expr))
5884 Old := Entity (Prefix (Expr));
5886 elsif Is_Entity_Name (Expr)
5887 and then Ekind (Entity (Expr)) = E_Constant
5889 Decl := Declaration_Node (Entity (Expr));
5891 if Nkind (Decl) = N_Object_Declaration
5892 and then Present (Expression (Decl))
5893 and then Nkind (Expression (Decl)) = N_Attribute_Reference
5894 and then Is_Entity_Name (Prefix (Expression (Decl)))
5896 Old := Entity (Prefix (Expression (Decl)));
5898 elsif Nkind (Expr) = N_Function_Call then
5902 -- A function call (most likely to To_Address) is probably not an
5903 -- overlay, so skip warning. Ditto if the function call was inlined
5904 -- and transformed into an entity.
5906 elsif Nkind (Original_Node (Expr)) = N_Function_Call then
5910 Decl := Next (Parent (Expr));
5912 -- If a pragma Import follows, we assume that it is for the current
5913 -- target of the address clause, and skip the warning.
5916 and then Nkind (Decl) = N_Pragma
5917 and then Pragma_Name (Decl) = Name_Import
5922 if Present (Old) then
5923 Error_Msg_Node_2 := Old;
5925 ("default initialization of & may modify &?",
5929 ("default initialization of & may modify overlaid storage?",
5933 -- Add friendly warning if initialization comes from a packed array
5936 if Is_Record_Type (Typ) then
5941 Comp := First_Component (Typ);
5942 while Present (Comp) loop
5943 if Nkind (Parent (Comp)) = N_Component_Declaration
5944 and then Present (Expression (Parent (Comp)))
5947 elsif Is_Array_Type (Etype (Comp))
5948 and then Present (Packed_Array_Type (Etype (Comp)))
5951 ("\packed array component& " &
5952 "will be initialized to zero?",
5956 Next_Component (Comp);
5963 ("\use pragma Import for & to " &
5964 "suppress initialization (RM B.1(24))?",