-- --
-- B o d y --
-- --
--- $Revision: 1.281 $
--- --
--- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Elists; use Elists;
with Errout; use Errout;
with Exp_Ch7; use Exp_Ch7;
-with Exp_Ch11; use Exp_Ch11;
with Exp_Pakd; use Exp_Pakd;
with Exp_Util; use Exp_Util;
+with Exp_Tss; use Exp_Tss;
with Layout; use Layout;
+with Lib.Xref; use Lib.Xref;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Restrict; use Restrict;
+with Rident; use Rident;
with Sem; use Sem;
with Sem_Cat; use Sem_Cat;
with Sem_Ch6; use Sem_Ch6;
(Decl : Node_Id;
New_S : Entity_Id;
After : in out Node_Id);
- -- Build body for a renaming declaration, insert in tree and analyze.
+ -- Build body for a renaming declaration, insert in tree and analyze
+
+ procedure Check_Address_Clause (E : Entity_Id);
+ -- Apply legality checks to address clauses for object declarations,
+ -- at the point the object is frozen.
procedure Check_Strict_Alignment (E : Entity_Id);
-- E is a base type. If E is tagged or has a component that is aliased
-- that if a foreign convention is specified, and no specific size
-- is given, then the size must be at least Integer'Size.
- procedure Freeze_Fixed_Point_Type (Typ : Entity_Id);
- -- Freeze fixed point type. For fixed-point types, we have to defer
- -- setting the size and bounds till the freeze point, since they are
- -- potentially affected by the presence of size and small clauses.
-
procedure Freeze_Static_Object (E : Entity_Id);
-- If an object is frozen which has Is_Statically_Allocated set, then
-- all referenced types must also be marked with this flag. This routine
-- a subprogram type (i.e. an access to a subprogram).
function Is_Fully_Defined (T : Entity_Id) return Boolean;
- -- true if T is not private, or has a full view.
+ -- True if T is not private and has no private components, or has a full
+ -- view. Used to determine whether the designated type of an access type
+ -- should be frozen when the access type is frozen. This is done when an
+ -- allocator is frozen, or an expression that may involve attributes of
+ -- the designated type. Otherwise freezing the access type does not freeze
+ -- the designated type.
procedure Process_Default_Expressions
(E : Entity_Id;
-- needed -- see body for details). Never has any effect on T if the
-- Debug_Info_Off flag is set.
+ procedure Undelay_Type (T : Entity_Id);
+ -- T is a type of a component that we know to be an Itype.
+ -- We don't want this to have a Freeze_Node, so ensure it doesn't.
+ -- Do the same for any Full_View or Corresponding_Record_Type.
+
+ procedure Warn_Overlay
+ (Expr : Node_Id;
+ Typ : Entity_Id;
+ Nam : Node_Id);
+ -- Expr is the expression for an address clause for entity Nam whose type
+ -- is Typ. If Typ has a default initialization, and there is no explicit
+ -- initialization in the source declaration, check whether the address
+ -- clause might cause overlaying of an entity, and emit a warning on the
+ -- side effect that the initialization will cause.
+
-------------------------------
-- Adjust_Esize_For_Alignment --
-------------------------------
After : in out Node_Id)
is
Body_Node : constant Node_Id := Build_Renamed_Body (Decl, New_S);
-
begin
Insert_After (After, Body_Node);
Mark_Rewrite_Insertion (Body_Node);
function Build_Renamed_Body
(Decl : Node_Id;
- New_S : Entity_Id)
- return Node_Id
+ New_S : Entity_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (New_S);
-- We use for the source location of the renamed body, the location
Old_S := Etype (Nam);
elsif Nkind (Nam) = N_Indexed_Component then
-
if Is_Entity_Name (Prefix (Nam)) then
Old_S := Entity (Prefix (Nam));
else
end if;
if Is_Entity_Name (Nam) then
- Call_Name := New_Reference_To (Old_S, Loc);
+
+ -- If the renamed entity is a predefined operator, retain full
+ -- name to ensure its visibility.
+
+ if Ekind (Old_S) = E_Operator
+ and then Nkind (Nam) = N_Expanded_Name
+ then
+ Call_Name := New_Copy (Name (N));
+ else
+ Call_Name := New_Reference_To (Old_S, Loc);
+ end if;
+
else
Call_Name := New_Copy (Name (N));
-- in the declaration. However, default values that are aggregates
-- are rewritten when partially analyzed, so we recover the original
-- aggregate to insure that subsequent conformity checking works.
+ -- Similarly, if the default expression was constant-folded, recover
+ -- the original expression.
Formal := First_Formal (Defining_Entity (Decl));
Set_Entity (Parameter_Type (Param_Spec), Etype (O_Formal));
end if;
- elsif Nkind (Default_Value (O_Formal)) = N_Aggregate then
+ elsif Nkind (Default_Value (O_Formal)) = N_Aggregate
+ or else Nkind (Original_Node (Default_Value (O_Formal))) /=
+ Nkind (Default_Value (O_Formal))
+ then
Set_Expression (Param_Spec,
New_Copy_Tree (Original_Node (Default_Value (O_Formal))));
end if;
Parameter_Associations => Actuals);
end if;
- -- Create entities for subprogram body and formals.
+ -- Create entities for subprogram body and formals
Set_Defining_Unit_Name (Spec,
Make_Defining_Identifier (Loc, Chars => Chars (New_S)));
return Body_Node;
end Build_Renamed_Body;
+ --------------------------
+ -- Check_Address_Clause --
+ --------------------------
+
+ procedure Check_Address_Clause (E : Entity_Id) is
+ Addr : constant Node_Id := Address_Clause (E);
+ Expr : Node_Id;
+ Decl : constant Node_Id := Declaration_Node (E);
+ Typ : constant Entity_Id := Etype (E);
+
+ begin
+ if Present (Addr) then
+ Expr := Expression (Addr);
+
+ -- If we have no initialization of any kind, then we don't
+ -- need to place any restrictions on the address clause, because
+ -- the object will be elaborated after the address clause is
+ -- evaluated. This happens if the declaration has no initial
+ -- expression, or the type has no implicit initialization, or
+ -- the object is imported.
+
+ -- The same holds for all initialized scalar types and all
+ -- access types. Packed bit arrays of size up to 64 are
+ -- represented using a modular type with an initialization
+ -- (to zero) and can be processed like other initialized
+ -- scalar types.
+
+ -- If the type is controlled, code to attach the object to a
+ -- finalization chain is generated at the point of declaration,
+ -- and therefore the elaboration of the object cannot be delayed:
+ -- the address expression must be a constant.
+
+ if (No (Expression (Decl))
+ and then not Controlled_Type (Typ)
+ and then
+ (not Has_Non_Null_Base_Init_Proc (Typ)
+ or else Is_Imported (E)))
+
+ or else
+ (Present (Expression (Decl))
+ and then Is_Scalar_Type (Typ))
+
+ or else
+ Is_Access_Type (Typ)
+
+ or else
+ (Is_Bit_Packed_Array (Typ)
+ and then
+ Is_Modular_Integer_Type (Packed_Array_Type (Typ)))
+ then
+ null;
+
+ -- Otherwise, we require the address clause to be constant
+ -- because the call to the initialization procedure (or the
+ -- attach code) has to happen at the point of the declaration.
+
+ else
+ Check_Constant_Address_Clause (Expr, E);
+ Set_Has_Delayed_Freeze (E, False);
+ end if;
+
+ if not Error_Posted (Expr)
+ and then not Controlled_Type (Typ)
+ then
+ Warn_Overlay (Expr, Typ, Name (Addr));
+ end if;
+ end if;
+ end Check_Address_Clause;
+
-----------------------------
-- Check_Compile_Time_Size --
-----------------------------
procedure Check_Compile_Time_Size (T : Entity_Id) is
- procedure Set_Small_Size (S : Uint);
+ procedure Set_Small_Size (T : Entity_Id; S : Uint);
-- Sets the compile time known size (32 bits or less) in the Esize
- -- field, checking for a size clause that was given which attempts
+ -- field, of T checking for a size clause that was given which attempts
-- to give a smaller size.
function Size_Known (T : Entity_Id) return Boolean;
- -- Recursive function that does all the work.
- -- Is this right??? isn't recursive case already handled???
- -- certainly yes for normal call, but what about bogus sem_res call???
+ -- Recursive function that does all the work
function Static_Discriminated_Components (T : Entity_Id) return Boolean;
-- If T is a constrained subtype, its size is not known if any of its
-- discriminant constraints is not static and it is not a null record.
- -- The test is conservative and doesn't check that the components are
+ -- The test is conservative and doesn't check that the components are
-- in fact constrained by non-static discriminant values. Could be made
-- more precise ???
-- Set_Small_Size --
--------------------
- procedure Set_Small_Size (S : Uint) is
+ procedure Set_Small_Size (T : Entity_Id; S : Uint) is
begin
if S > 32 then
return;
if Size_Known_At_Compile_Time (T) then
return True;
- elsif Error_Posted (T) then
- return False;
-
elsif Is_Scalar_Type (T)
or else Is_Task_Type (T)
then
return not Is_Generic_Type (T);
elsif Is_Array_Type (T) then
-
if Ekind (T) = E_String_Literal_Subtype then
- Set_Small_Size (Component_Size (T) * String_Literal_Length (T));
+ Set_Small_Size (T, Component_Size (T)
+ * String_Literal_Length (T));
return True;
elsif not Is_Constrained (T) then
return False;
+ -- Don't do any recursion on type with error posted, since
+ -- we may have a malformed type that leads us into a loop
+
+ elsif Error_Posted (T) then
+ return False;
+
elsif not Size_Known (Component_Type (T)) then
return False;
end if;
begin
Index := First_Index (T);
-
while Present (Index) loop
if Nkind (Index) = N_Range then
Get_Index_Bounds (Index, Low, High);
Next_Index (Index);
end loop;
- Set_Small_Size (Esiz);
+ Set_Small_Size (T, Esiz);
return True;
end;
and then not Is_Generic_Type (T)
and then Present (Underlying_Type (T))
then
- return Size_Known (Underlying_Type (T));
+ -- Don't do any recursion on type with error posted, since
+ -- we may have a malformed type that leads us into a loop
+
+ if Error_Posted (T) then
+ return False;
+ else
+ return Size_Known (Underlying_Type (T));
+ end if;
elsif Is_Record_Type (T) then
+
+ -- A class-wide type is never considered to have a known size
+
if Is_Class_Wide_Type (T) then
return False;
- elsif T /= Base_Type (T) then
- return Size_Known_At_Compile_Time (Base_Type (T))
- and then Static_Discriminated_Components (T);
+ -- A subtype of a variant record must not have non-static
+ -- discriminanted components.
- else
- declare
- Packed_Size_Known : Boolean := Is_Packed (T);
- Packed_Size : Uint := Uint_0;
+ elsif T /= Base_Type (T)
+ and then not Static_Discriminated_Components (T)
+ then
+ return False;
- begin
- -- Test for variant part present
-
- if Has_Discriminants (T)
- and then Present (Parent (T))
- and then Nkind (Parent (T)) = N_Full_Type_Declaration
- and then Nkind (Type_Definition (Parent (T))) =
- N_Record_Definition
- and then not Null_Present (Type_Definition (Parent (T)))
- and then Present (Variant_Part
- (Component_List (Type_Definition (Parent (T)))))
+ -- Don't do any recursion on type with error posted, since
+ -- we may have a malformed type that leads us into a loop
+
+ elsif Error_Posted (T) then
+ return False;
+ end if;
+
+ -- Now look at the components of the record
+
+ declare
+ -- The following two variables are used to keep track of
+ -- the size of packed records if we can tell the size of
+ -- the packed record in the front end. Packed_Size_Known
+ -- is True if so far we can figure out the size. It is
+ -- initialized to True for a packed record, unless the
+ -- record has discriminants. The reason we eliminate the
+ -- discriminated case is that we don't know the way the
+ -- back end lays out discriminated packed records. If
+ -- Packed_Size_Known is True, then Packed_Size is the
+ -- size in bits so far.
+
+ Packed_Size_Known : Boolean :=
+ Is_Packed (T)
+ and then not Has_Discriminants (T);
+
+ Packed_Size : Uint := Uint_0;
+
+ begin
+ -- Test for variant part present
+
+ if Has_Discriminants (T)
+ and then Present (Parent (T))
+ and then Nkind (Parent (T)) = N_Full_Type_Declaration
+ and then Nkind (Type_Definition (Parent (T))) =
+ N_Record_Definition
+ and then not Null_Present (Type_Definition (Parent (T)))
+ and then Present (Variant_Part
+ (Component_List (Type_Definition (Parent (T)))))
+ then
+ -- If variant part is present, and type is unconstrained,
+ -- then we must have defaulted discriminants, or a size
+ -- clause must be present for the type, or else the size
+ -- is definitely not known at compile time.
+
+ if not Is_Constrained (T)
+ and then
+ No (Discriminant_Default_Value
+ (First_Discriminant (T)))
+ and then Unknown_Esize (T)
then
- -- If variant part is present, and type is unconstrained,
- -- then we must have defaulted discriminants, or a size
- -- clause must be present for the type, or else the size
- -- is definitely not known at compile time.
-
- if not Is_Constrained (T)
- and then
- No (Discriminant_Default_Value
- (First_Discriminant (T)))
- and then Unknown_Esize (T)
- then
- return False;
- else
- -- We do not know the packed size, it is too much
- -- trouble to figure it out.
+ return False;
+ end if;
+ end if;
- Packed_Size_Known := False;
- end if;
+ -- Loop through components
+
+ Comp := First_Component_Or_Discriminant (T);
+ while Present (Comp) loop
+ Ctyp := Etype (Comp);
+
+ -- We do not know the packed size if there is a component
+ -- clause present (we possibly could, but this would only
+ -- help in the case of a record with partial rep clauses.
+ -- That's because in the case of full rep clauses, the
+ -- size gets figured out anyway by a different circuit).
+
+ if Present (Component_Clause (Comp)) then
+ Packed_Size_Known := False;
end if;
- Comp := First_Entity (T);
+ -- We need to identify a component that is an array where
+ -- the index type is an enumeration type with non-standard
+ -- representation, and some bound of the type depends on a
+ -- discriminant.
- while Present (Comp) loop
- if Ekind (Comp) = E_Component
- or else
- Ekind (Comp) = E_Discriminant
- then
- Ctyp := Etype (Comp);
+ -- This is because gigi computes the size by doing a
+ -- substituation of the appropriate discriminant value in
+ -- the size expression for the base type, and gigi is not
+ -- clever enough to evaluate the resulting expression (which
+ -- involves a call to rep_to_pos) at compile time.
- if Present (Component_Clause (Comp)) then
- Packed_Size_Known := False;
- end if;
+ -- It would be nice if gigi would either recognize that
+ -- this expression can be computed at compile time, or
+ -- alternatively figured out the size from the subtype
+ -- directly, where all the information is at hand ???
+
+ if Is_Array_Type (Etype (Comp))
+ and then Present (Packed_Array_Type (Etype (Comp)))
+ then
+ declare
+ Ocomp : constant Entity_Id :=
+ Original_Record_Component (Comp);
+ OCtyp : constant Entity_Id := Etype (Ocomp);
+ Ind : Node_Id;
+ Indtyp : Entity_Id;
+ Lo, Hi : Node_Id;
+
+ begin
+ Ind := First_Index (OCtyp);
+ while Present (Ind) loop
+ Indtyp := Etype (Ind);
+
+ if Is_Enumeration_Type (Indtyp)
+ and then Has_Non_Standard_Rep (Indtyp)
+ then
+ Lo := Type_Low_Bound (Indtyp);
+ Hi := Type_High_Bound (Indtyp);
+
+ if Is_Entity_Name (Lo)
+ and then Ekind (Entity (Lo)) = E_Discriminant
+ then
+ return False;
+
+ elsif Is_Entity_Name (Hi)
+ and then Ekind (Entity (Hi)) = E_Discriminant
+ then
+ return False;
+ end if;
+ end if;
- if not Size_Known (Ctyp) then
- return False;
+ Next_Index (Ind);
+ end loop;
+ end;
+ end if;
- elsif Packed_Size_Known then
+ -- Clearly size of record is not known if the size of
+ -- one of the components is not known.
- -- If RM_Size is known and static, then we can
- -- keep accumulating the packed size.
+ if not Size_Known (Ctyp) then
+ return False;
+ end if;
- if Known_Static_RM_Size (Ctyp) then
+ -- Accumulate packed size if possible
- -- A little glitch, to be removed sometime ???
- -- gigi does not understand zero sizes yet.
+ if Packed_Size_Known then
- if RM_Size (Ctyp) = Uint_0 then
- Packed_Size_Known := False;
- end if;
+ -- We can only deal with elementary types, since for
+ -- non-elementary components, alignment enters into the
+ -- picture, and we don't know enough to handle proper
+ -- alignment in this context. Packed arrays count as
+ -- elementary if the representation is a modular type.
+
+ if Is_Elementary_Type (Ctyp)
+ or else (Is_Array_Type (Ctyp)
+ and then Present (Packed_Array_Type (Ctyp))
+ and then Is_Modular_Integer_Type
+ (Packed_Array_Type (Ctyp)))
+ then
+ -- If RM_Size is known and static, then we can
+ -- keep accumulating the packed size.
- Packed_Size :=
- Packed_Size + RM_Size (Ctyp);
+ if Known_Static_RM_Size (Ctyp) then
- -- If we have a field whose RM_Size is not known
- -- then we can't figure out the packed size here.
+ -- A little glitch, to be removed sometime ???
+ -- gigi does not understand zero sizes yet.
- else
+ if RM_Size (Ctyp) = Uint_0 then
Packed_Size_Known := False;
+
+ -- Normal case where we can keep accumulating the
+ -- packed array size.
+
+ else
+ Packed_Size := Packed_Size + RM_Size (Ctyp);
end if;
+
+ -- If we have a field whose RM_Size is not known then
+ -- we can't figure out the packed size here.
+
+ else
+ Packed_Size_Known := False;
end if;
- end if;
- Next_Entity (Comp);
- end loop;
+ -- If we have a non-elementary type we can't figure out
+ -- the packed array size (alignment issues).
- if Packed_Size_Known then
- Set_Small_Size (Packed_Size);
+ else
+ Packed_Size_Known := False;
+ end if;
end if;
- return True;
- end;
- end if;
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
+
+ if Packed_Size_Known then
+ Set_Small_Size (T, Packed_Size);
+ end if;
+
+ return True;
+ end;
else
return False;
-------------------------------------
function Static_Discriminated_Components
- (T : Entity_Id)
- return Boolean
+ (T : Entity_Id) return Boolean
is
Constraint : Elmt_Id;
and then Present (First_Component (T))
then
Constraint := First_Elmt (Discriminant_Constraint (T));
-
while Present (Constraint) loop
if not Compile_Time_Known_Value (Node (Constraint)) then
return False;
while Present (Comp) loop
if not Is_Type (Comp)
and then (Strict_Alignment (Etype (Comp))
- or else Is_Aliased (Comp))
+ or else Is_Aliased (Comp))
then
Set_Strict_Alignment (E);
return;
end if;
return;
-
end if;
end if;
end loop;
end Check_Unsigned_Type;
+ -----------------------------
+ -- Expand_Atomic_Aggregate --
+ -----------------------------
+
+ procedure Expand_Atomic_Aggregate (E : Entity_Id; Typ : Entity_Id) is
+ Loc : constant Source_Ptr := Sloc (E);
+ New_N : Node_Id;
+ Temp : Entity_Id;
+
+ begin
+ if (Nkind (Parent (E)) = N_Object_Declaration
+ or else Nkind (Parent (E)) = N_Assignment_Statement)
+ and then Comes_From_Source (Parent (E))
+ and then Nkind (E) = N_Aggregate
+ then
+ Temp :=
+ Make_Defining_Identifier (Loc,
+ New_Internal_Name ('T'));
+
+ New_N :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Object_definition => New_Occurrence_Of (Typ, Loc),
+ Expression => Relocate_Node (E));
+ Insert_Before (Parent (E), New_N);
+ Analyze (New_N);
+
+ Set_Expression (Parent (E), New_Occurrence_Of (Temp, Loc));
+
+ -- To prevent the temporary from being constant-folded (which
+ -- would lead to the same piecemeal assignment on the original
+ -- target) indicate to the back-end that the temporary is a
+ -- variable with real storage. See description of this flag
+ -- in Einfo, and the notes on N_Assignment_Statement and
+ -- N_Object_Declaration in Sinfo.
+
+ Set_Is_True_Constant (Temp, False);
+ end if;
+ end Expand_Atomic_Aggregate;
+
----------------
-- Freeze_All --
----------------
-- should not be recursive, we don't want to analyze those till
-- we are sure that ALL the types are frozen).
+ --------------------
+ -- Freeze_All_Ent --
+ --------------------
+
procedure Freeze_All_Ent
(From : Entity_Id;
After : in out Node_Id)
-- If freeze nodes are present, insert and analyze, and reset
-- cursor for next insertion.
+ -------------------
+ -- Process_Flist --
+ -------------------
+
procedure Process_Flist is
begin
if Is_Non_Empty_List (Flist) then
end if;
end Process_Flist;
+ -- Start or processing for Freeze_All_Ent
+
begin
E := From;
while Present (E) loop
elsif Ekind (E) in Task_Kind
and then
(Nkind (Parent (E)) = N_Task_Type_Declaration
- or else
+ or else
Nkind (Parent (E)) = N_Single_Task_Declaration)
then
New_Scope (E);
declare
Prim_List : constant Elist_Id :=
Primitive_Operations (Etype (E));
- Prim : Elmt_Id;
- Subp : Entity_Id;
+
+ Prim : Elmt_Id;
+ Subp : Entity_Id;
begin
Prim := First_Elmt (Prim_List);
Process_Flist;
end if;
+ -- If an incomplete type is still not frozen, this may be
+ -- a premature freezing because of a body declaration that
+ -- follows. Indicate where the freezing took place.
+
+ -- If the freezing is caused by the end of the current
+ -- declarative part, it is a Taft Amendment type, and there
+ -- is no error.
+
+ if not Is_Frozen (E)
+ and then Ekind (E) = E_Incomplete_Type
+ then
+ declare
+ Bod : constant Node_Id := Next (After);
+
+ begin
+ if (Nkind (Bod) = N_Subprogram_Body
+ or else Nkind (Bod) = N_Entry_Body
+ or else Nkind (Bod) = N_Package_Body
+ or else Nkind (Bod) = N_Protected_Body
+ or else Nkind (Bod) = N_Task_Body
+ or else Nkind (Bod) in N_Body_Stub)
+ and then
+ List_Containing (After) = List_Containing (Parent (E))
+ then
+ Error_Msg_Sloc := Sloc (Next (After));
+ Error_Msg_NE
+ ("type& is frozen# before its full declaration",
+ Parent (E), E);
+ end if;
+ end;
+ end if;
+
Next_Entity (E);
end loop;
end Freeze_All_Ent;
-- that require us to build a default expression functions. This is the
-- point at which such functions are constructed (after all types that
-- might be used in such expressions have been frozen).
+
-- We also add finalization chains to access types whose designated
-- types are controlled. This is normally done when freezing the type,
-- but this misses recursive type definitions where the later members
E := From;
while Present (E) loop
-
if Is_Subprogram (E) then
if not Default_Expressions_Processed (E) then
and then Present (Corresponding_Body (Decl))
and then
Nkind (Unit_Declaration_Node (Corresponding_Body (Decl)))
- = N_Subprogram_Renaming_Declaration
+ = N_Subprogram_Renaming_Declaration
then
Build_And_Analyze_Renamed_Body
(Decl, Corresponding_Body (Decl), After);
elsif Ekind (E) in Task_Kind
and then
(Nkind (Parent (E)) = N_Task_Type_Declaration
- or else
+ or else
Nkind (Parent (E)) = N_Single_Task_Declaration)
then
declare
Ent : Entity_Id;
-
begin
Ent := First_Entity (E);
Next_Entity (E);
end loop;
-
end Freeze_All;
-----------------------
Result : in out List_Id)
is
L : constant List_Id := Freeze_Entity (Ent, Loc);
-
begin
if Is_Non_Empty_List (L) then
if Result = No_List then
procedure Freeze_Before (N : Node_Id; T : Entity_Id) is
Freeze_Nodes : constant List_Id := Freeze_Entity (T, Sloc (N));
- F : Node_Id;
-
begin
if Is_Non_Empty_List (Freeze_Nodes) then
- F := First (Freeze_Nodes);
-
- if Present (F) then
- Insert_Actions (N, Freeze_Nodes);
- end if;
+ Insert_Actions (N, Freeze_Nodes);
end if;
end Freeze_Before;
-------------------
function Freeze_Entity (E : Entity_Id; Loc : Source_Ptr) return List_Id is
+ Test_E : Entity_Id := E;
Comp : Entity_Id;
F_Node : Node_Id;
Result : List_Id;
Atype : Entity_Id;
procedure Check_Current_Instance (Comp_Decl : Node_Id);
- -- Check that an Access or Unchecked_Access attribute with
- -- a prefix which is the current instance type can only be
- -- applied when the type is limited.
+ -- Check that an Access or Unchecked_Access attribute with a prefix
+ -- which is the current instance type can only be applied when the type
+ -- is limited.
function After_Last_Declaration return Boolean;
-- If Loc is a freeze_entity that appears after the last declaration
-- in the scope, inhibit error messages on late completion.
procedure Freeze_Record_Type (Rec : Entity_Id);
- -- Freeze each component, handle some representation clauses, and
- -- freeze primitive operations if this is a tagged type.
+ -- Freeze each component, handle some representation clauses, and freeze
+ -- primitive operations if this is a tagged type.
----------------------------
-- After_Last_Declaration --
----------------------------
function After_Last_Declaration return Boolean is
- Spec : Node_Id := Parent (Current_Scope);
+ Spec : constant Node_Id := Parent (Current_Scope);
begin
if Nkind (Spec) = N_Package_Specification then
procedure Check_Current_Instance (Comp_Decl : Node_Id) is
function Process (N : Node_Id) return Traverse_Result;
- -- Process routine to apply check to given node.
+ -- Process routine to apply check to given node
+
+ -------------
+ -- Process --
+ -------------
function Process (N : Node_Id) return Traverse_Result is
begin
procedure Freeze_Record_Type (Rec : Entity_Id) is
Comp : Entity_Id;
+ IR : Node_Id;
Junk : Boolean;
ADC : Node_Id;
+ Prev : Entity_Id;
Unplaced_Component : Boolean := False;
-- Set True if we find at least one component with no component
-- Set True if we find at least one component with a component
-- clause (used to warn about useless Bit_Order pragmas).
- begin
- -- Freeze components and embedded subtypes
+ procedure Check_Itype (Desig : Entity_Id);
+ -- If the component subtype is an access to a constrained subtype
+ -- of an already frozen type, make the subtype frozen as well. It
+ -- might otherwise be frozen in the wrong scope, and a freeze node
+ -- on subtype has no effect.
- Comp := First_Entity (Rec);
+ -----------------
+ -- Check_Itype --
+ -----------------
- while Present (Comp) loop
-
- if not Is_Type (Comp) then
- Freeze_And_Append (Etype (Comp), Loc, Result);
- end if;
-
- -- If the component is an access type with an allocator
- -- as default value, the designated type will be frozen
- -- by the corresponding expression in init_proc. In order
- -- to place the freeze node for the designated type before
- -- that for the current record type, freeze it now.
-
- -- Same process if the component is an array of access types,
- -- initialized with an aggregate. If the designated type is
- -- private, it cannot contain allocators, and it is premature
- -- to freeze the type, so we check for this as well.
-
- if Is_Access_Type (Etype (Comp))
- and then Present (Parent (Comp))
- and then Present (Expression (Parent (Comp)))
- and then Nkind (Expression (Parent (Comp))) = N_Allocator
+ procedure Check_Itype (Desig : Entity_Id) is
+ begin
+ if not Is_Frozen (Desig)
+ and then Is_Frozen (Base_Type (Desig))
then
- declare
- Alloc : constant Node_Id := Expression (Parent (Comp));
+ Set_Is_Frozen (Desig);
- begin
- -- If component is pointer to a classwide type, freeze
- -- the specific type in the expression being allocated.
- -- The expression may be a subtype indication, in which
- -- case freeze the subtype mark.
+ -- In addition, add an Itype_Reference to ensure that the
+ -- access subtype is elaborated early enough. This cannot
+ -- be done if the subtype may depend on discriminants.
- if Is_Class_Wide_Type (Designated_Type (Etype (Comp))) then
+ if Ekind (Comp) = E_Component
+ and then Is_Itype (Etype (Comp))
+ and then not Has_Discriminants (Rec)
+ then
+ IR := Make_Itype_Reference (Sloc (Comp));
+ Set_Itype (IR, Desig);
- if Is_Entity_Name (Expression (Alloc)) then
- Freeze_And_Append
- (Entity (Expression (Alloc)), Loc, Result);
- elsif
- Nkind (Expression (Alloc)) = N_Subtype_Indication
- then
- Freeze_And_Append
- (Entity (Subtype_Mark (Expression (Alloc))),
- Loc, Result);
- end if;
+ if No (Result) then
+ Result := New_List (IR);
else
- Freeze_And_Append
- (Designated_Type (Etype (Comp)), Loc, Result);
+ Append (IR, Result);
end if;
- end;
+ end if;
+ end if;
+ end Check_Itype;
- elsif Is_Array_Type (Etype (Comp))
- and then Is_Access_Type (Component_Type (Etype (Comp)))
- and then Present (Parent (Comp))
- and then Nkind (Parent (Comp)) = N_Component_Declaration
- and then Present (Expression (Parent (Comp)))
- and then Nkind (Expression (Parent (Comp))) = N_Aggregate
- and then Is_Fully_Defined
- (Designated_Type (Component_Type (Etype (Comp))))
+ -- Start of processing for Freeze_Record_Type
+
+ begin
+ -- If this is a subtype of a controlled type, declared without
+ -- a constraint, the _controller may not appear in the component
+ -- list if the parent was not frozen at the point of subtype
+ -- declaration. Inherit the _controller component now.
+
+ if Rec /= Base_Type (Rec)
+ and then Has_Controlled_Component (Rec)
+ then
+ if Nkind (Parent (Rec)) = N_Subtype_Declaration
+ and then Is_Entity_Name (Subtype_Indication (Parent (Rec)))
then
- Freeze_And_Append
- (Designated_Type
- (Component_Type (Etype (Comp))), Loc, Result);
+ Set_First_Entity (Rec, First_Entity (Base_Type (Rec)));
+
+ -- If this is an internal type without a declaration, as for
+ -- record component, the base type may not yet be frozen, and its
+ -- controller has not been created. Add an explicit freeze node
+ -- for the itype, so it will be frozen after the base type. This
+ -- freeze node is used to communicate with the expander, in order
+ -- to create the controller for the enclosing record, and it is
+ -- deleted afterwards (see exp_ch3). It must not be created when
+ -- expansion is off, because it might appear in the wrong context
+ -- for the back end.
+
+ elsif Is_Itype (Rec)
+ and then Has_Delayed_Freeze (Base_Type (Rec))
+ and then
+ Nkind (Associated_Node_For_Itype (Rec)) =
+ N_Component_Declaration
+ and then Expander_Active
+ then
+ Ensure_Freeze_Node (Rec);
end if;
+ end if;
- -- Processing for real components (exclude anonymous subtypes)
+ -- Freeze components and embedded subtypes
+
+ Comp := First_Entity (Rec);
+ Prev := Empty;
+ while Present (Comp) loop
+
+ -- First handle the (real) component case
if Ekind (Comp) = E_Component
or else Ekind (Comp) = E_Discriminant
then
- -- Check for error of component clause given for variable
- -- sized type. We have to delay this test till this point,
- -- since the component type has to be frozen for us to know
- -- if it is variable length. We omit this test in a generic
- -- context, it will be applied at instantiation time.
-
declare
CC : constant Node_Id := Component_Clause (Comp);
begin
+ -- Freezing a record type freezes the type of each of its
+ -- components. However, if the type of the component is
+ -- part of this record, we do not want or need a separate
+ -- Freeze_Node. Note that Is_Itype is wrong because that's
+ -- also set in private type cases. We also can't check for
+ -- the Scope being exactly Rec because of private types and
+ -- record extensions.
+
+ if Is_Itype (Etype (Comp))
+ and then Is_Record_Type (Underlying_Type
+ (Scope (Etype (Comp))))
+ then
+ Undelay_Type (Etype (Comp));
+ end if;
+
+ Freeze_And_Append (Etype (Comp), Loc, Result);
+
+ -- Check for error of component clause given for variable
+ -- sized type. We have to delay this test till this point,
+ -- since the component type has to be frozen for us to know
+ -- if it is variable length. We omit this test in a generic
+ -- context, it will be applied at instantiation time.
+
if Present (CC) then
Placed_Component := True;
- if not Size_Known_At_Compile_Time
+ if Inside_A_Generic then
+ null;
+
+ elsif not Size_Known_At_Compile_Time
(Underlying_Type (Etype (Comp)))
- and then not Inside_A_Generic
then
Error_Msg_N
("component clause not allowed for variable " &
else
Unplaced_Component := True;
end if;
- end;
- -- If component clause is present, then deal with the
- -- non-default bit order case. We cannot do this before
- -- the freeze point, because there is no required order
- -- for the component clause and the bit_order clause.
+ -- Case of component requires byte alignment
- -- We only do this processing for the base type, and in
- -- fact that's important, since otherwise if there are
- -- record subtypes, we could reverse the bits once for
- -- each subtype, which would be incorrect.
+ if Must_Be_On_Byte_Boundary (Etype (Comp)) then
- if Present (Component_Clause (Comp))
- and then Reverse_Bit_Order (Rec)
- and then Ekind (E) = E_Record_Type
- then
- declare
- CFB : constant Uint := Component_Bit_Offset (Comp);
- CSZ : constant Uint := Esize (Comp);
- CLC : constant Node_Id := Component_Clause (Comp);
- Pos : constant Node_Id := Position (CLC);
- FB : constant Node_Id := First_Bit (CLC);
+ -- Set the enclosing record to also require byte align
- Storage_Unit_Offset : constant Uint :=
- CFB / System_Storage_Unit;
+ Set_Must_Be_On_Byte_Boundary (Rec);
- Start_Bit : constant Uint :=
- CFB mod System_Storage_Unit;
+ -- Check for component clause that is inconsistent
+ -- with the required byte boundary alignment.
- begin
- -- Cases where field goes over storage unit boundary
+ if Present (CC)
+ and then Normalized_First_Bit (Comp) mod
+ System_Storage_Unit /= 0
+ then
+ Error_Msg_N
+ ("component & must be byte aligned",
+ Component_Name (Component_Clause (Comp)));
+ end if;
+ end if;
- if Start_Bit + CSZ > System_Storage_Unit then
+ -- If component clause is present, then deal with the
+ -- non-default bit order case for Ada 95 mode. The required
+ -- processing for Ada 2005 mode is handled separately after
+ -- processing all components.
- -- Allow multi-byte field but generate warning
+ -- We only do this processing for the base type, and in
+ -- fact that's important, since otherwise if there are
+ -- record subtypes, we could reverse the bits once for
+ -- each subtype, which would be incorrect.
- if Start_Bit mod System_Storage_Unit = 0
- and then CSZ mod System_Storage_Unit = 0
- then
- Error_Msg_N
- ("multi-byte field specified with non-standard"
- & " Bit_Order?", CLC);
+ if Present (CC)
+ and then Reverse_Bit_Order (Rec)
+ and then Ekind (E) = E_Record_Type
+ and then Ada_Version <= Ada_95
+ then
+ declare
+ CFB : constant Uint := Component_Bit_Offset (Comp);
+ CSZ : constant Uint := Esize (Comp);
+ CLC : constant Node_Id := Component_Clause (Comp);
+ Pos : constant Node_Id := Position (CLC);
+ FB : constant Node_Id := First_Bit (CLC);
+
+ Storage_Unit_Offset : constant Uint :=
+ CFB / System_Storage_Unit;
- if Bytes_Big_Endian then
+ Start_Bit : constant Uint :=
+ CFB mod System_Storage_Unit;
+
+ begin
+ -- Cases where field goes over storage unit boundary
+
+ if Start_Bit + CSZ > System_Storage_Unit then
+
+ -- Allow multi-byte field but generate warning
+
+ if Start_Bit mod System_Storage_Unit = 0
+ and then CSZ mod System_Storage_Unit = 0
+ then
Error_Msg_N
- ("bytes are not reversed "
- & "(component is big-endian)?", CLC);
+ ("multi-byte field specified with non-standard"
+ & " Bit_Order?", CLC);
+
+ if Bytes_Big_Endian then
+ Error_Msg_N
+ ("bytes are not reversed "
+ & "(component is big-endian)?", CLC);
+ else
+ Error_Msg_N
+ ("bytes are not reversed "
+ & "(component is little-endian)?", CLC);
+ end if;
+
+ -- Do not allow non-contiguous field
+
else
Error_Msg_N
- ("bytes are not reversed "
- & "(component is little-endian)?", CLC);
+ ("attempt to specify non-contiguous field"
+ & " not permitted", CLC);
+ Error_Msg_N
+ ("\(caused by non-standard Bit_Order "
+ & "specified)", CLC);
end if;
- -- Do not allow non-contiguous field
+ -- Case where field fits in one storage unit
else
- Error_Msg_N
- ("attempt to specify non-contiguous field"
- & " not permitted", CLC);
- Error_Msg_N
- ("\(caused by non-standard Bit_Order "
- & "specified)", CLC);
- end if;
+ -- Give warning if suspicious component clause
- -- Case where field fits in one storage unit
+ if Intval (FB) >= System_Storage_Unit
+ and then Warn_On_Reverse_Bit_Order
+ then
+ Error_Msg_N
+ ("?Bit_Order clause does not affect " &
+ "byte ordering", Pos);
+ Error_Msg_Uint_1 :=
+ Intval (Pos) + Intval (FB) /
+ System_Storage_Unit;
+ Error_Msg_N
+ ("?position normalized to ^ before bit " &
+ "order interpreted", Pos);
+ end if;
- else
- -- Give warning if suspicious component clause
+ -- Here is where we fix up the Component_Bit_Offset
+ -- value to account for the reverse bit order.
+ -- Some examples of what needs to be done are:
- if Intval (FB) >= System_Storage_Unit then
- Error_Msg_N
- ("?Bit_Order clause does not affect " &
- "byte ordering", Pos);
- Error_Msg_Uint_1 :=
- Intval (Pos) + Intval (FB) / System_Storage_Unit;
- Error_Msg_N
- ("?position normalized to ^ before bit " &
- "order interpreted", Pos);
+ -- First_Bit .. Last_Bit Component_Bit_Offset
+ -- old new old new
+
+ -- 0 .. 0 7 .. 7 0 7
+ -- 0 .. 1 6 .. 7 0 6
+ -- 0 .. 2 5 .. 7 0 5
+ -- 0 .. 7 0 .. 7 0 4
+
+ -- 1 .. 1 6 .. 6 1 6
+ -- 1 .. 4 3 .. 6 1 3
+ -- 4 .. 7 0 .. 3 4 0
+
+ -- The general rule is that the first bit is
+ -- is obtained by subtracting the old ending bit
+ -- from storage_unit - 1.
+
+ Set_Component_Bit_Offset
+ (Comp,
+ (Storage_Unit_Offset * System_Storage_Unit) +
+ (System_Storage_Unit - 1) -
+ (Start_Bit + CSZ - 1));
+
+ Set_Normalized_First_Bit
+ (Comp,
+ Component_Bit_Offset (Comp) mod
+ System_Storage_Unit);
end if;
+ end;
+ end if;
+ end;
+ end if;
+
+ -- If the component is an Itype with Delayed_Freeze and is either
+ -- a record or array subtype and its base type has not yet been
+ -- frozen, we must remove this from the entity list of this
+ -- record and put it on the entity list of the scope of its base
+ -- type. Note that we know that this is not the type of a
+ -- component since we cleared Has_Delayed_Freeze for it in the
+ -- previous loop. Thus this must be the Designated_Type of an
+ -- access type, which is the type of a component.
+
+ if Is_Itype (Comp)
+ and then Is_Type (Scope (Comp))
+ and then Is_Composite_Type (Comp)
+ and then Base_Type (Comp) /= Comp
+ and then Has_Delayed_Freeze (Comp)
+ and then not Is_Frozen (Base_Type (Comp))
+ then
+ declare
+ Will_Be_Frozen : Boolean := False;
+ S : Entity_Id := Scope (Rec);
+
+ begin
+ -- We have a pretty bad kludge here. Suppose Rec is subtype
+ -- being defined in a subprogram that's created as part of
+ -- the freezing of Rec'Base. In that case, we know that
+ -- Comp'Base must have already been frozen by the time we
+ -- get to elaborate this because Gigi doesn't elaborate any
+ -- bodies until it has elaborated all of the declarative
+ -- part. But Is_Frozen will not be set at this point because
+ -- we are processing code in lexical order.
+
+ -- We detect this case by going up the Scope chain of Rec
+ -- and seeing if we have a subprogram scope before reaching
+ -- the top of the scope chain or that of Comp'Base. If we
+ -- do, then mark that Comp'Base will actually be frozen. If
+ -- so, we merely undelay it.
+
+ while Present (S) loop
+ if Is_Subprogram (S) then
+ Will_Be_Frozen := True;
+ exit;
+ elsif S = Scope (Base_Type (Comp)) then
+ exit;
+ end if;
+
+ S := Scope (S);
+ end loop;
+
+ if Will_Be_Frozen then
+ Undelay_Type (Comp);
+ else
+ if Present (Prev) then
+ Set_Next_Entity (Prev, Next_Entity (Comp));
+ else
+ Set_First_Entity (Rec, Next_Entity (Comp));
+ end if;
- -- Here is where we fix up the Component_Bit_Offset
- -- value to account for the reverse bit order.
- -- Some examples of what needs to be done are:
+ -- Insert in entity list of scope of base type (which
+ -- must be an enclosing scope, because still unfrozen).
- -- First_Bit .. Last_Bit Component_Bit_Offset
- -- old new old new
+ Append_Entity (Comp, Scope (Base_Type (Comp)));
+ end if;
+ end;
- -- 0 .. 0 7 .. 7 0 7
- -- 0 .. 1 6 .. 7 0 6
- -- 0 .. 2 5 .. 7 0 5
- -- 0 .. 7 0 .. 7 0 4
+ -- If the component is an access type with an allocator as
+ -- default value, the designated type will be frozen by the
+ -- corresponding expression in init_proc. In order to place the
+ -- freeze node for the designated type before that for the
+ -- current record type, freeze it now.
- -- 1 .. 1 6 .. 6 1 6
- -- 1 .. 4 3 .. 6 1 3
- -- 4 .. 7 0 .. 3 4 0
+ -- Same process if the component is an array of access types,
+ -- initialized with an aggregate. If the designated type is
+ -- private, it cannot contain allocators, and it is premature to
+ -- freeze the type, so we check for this as well.
- -- The general rule is that the first bit is
- -- is obtained by subtracting the old ending bit
- -- from storage_unit - 1.
+ elsif Is_Access_Type (Etype (Comp))
+ and then Present (Parent (Comp))
+ and then Present (Expression (Parent (Comp)))
+ and then Nkind (Expression (Parent (Comp))) = N_Allocator
+ then
+ declare
+ Alloc : constant Node_Id := Expression (Parent (Comp));
- Set_Component_Bit_Offset (Comp,
- (Storage_Unit_Offset * System_Storage_Unit)
- + (System_Storage_Unit - 1)
- - (Start_Bit + CSZ - 1));
+ begin
+ -- If component is pointer to a classwide type, freeze
+ -- the specific type in the expression being allocated.
+ -- The expression may be a subtype indication, in which
+ -- case freeze the subtype mark.
- Set_Normalized_First_Bit (Comp,
- Component_Bit_Offset (Comp) mod System_Storage_Unit);
+ if Is_Class_Wide_Type (Designated_Type (Etype (Comp))) then
+ if Is_Entity_Name (Expression (Alloc)) then
+ Freeze_And_Append
+ (Entity (Expression (Alloc)), Loc, Result);
+ elsif
+ Nkind (Expression (Alloc)) = N_Subtype_Indication
+ then
+ Freeze_And_Append
+ (Entity (Subtype_Mark (Expression (Alloc))),
+ Loc, Result);
end if;
- end;
- end if;
+
+ elsif Is_Itype (Designated_Type (Etype (Comp))) then
+ Check_Itype (Designated_Type (Etype (Comp)));
+
+ else
+ Freeze_And_Append
+ (Designated_Type (Etype (Comp)), Loc, Result);
+ end if;
+ end;
+
+ elsif Is_Access_Type (Etype (Comp))
+ and then Is_Itype (Designated_Type (Etype (Comp)))
+ then
+ Check_Itype (Designated_Type (Etype (Comp)));
+
+ elsif Is_Array_Type (Etype (Comp))
+ and then Is_Access_Type (Component_Type (Etype (Comp)))
+ and then Present (Parent (Comp))
+ and then Nkind (Parent (Comp)) = N_Component_Declaration
+ and then Present (Expression (Parent (Comp)))
+ and then Nkind (Expression (Parent (Comp))) = N_Aggregate
+ and then Is_Fully_Defined
+ (Designated_Type (Component_Type (Etype (Comp))))
+ then
+ Freeze_And_Append
+ (Designated_Type
+ (Component_Type (Etype (Comp))), Loc, Result);
end if;
+ Prev := Comp;
Next_Entity (Comp);
end loop;
- -- Check for useless pragma Bit_Order
+ -- Deal with pragma Bit_Order
+
+ if Reverse_Bit_Order (Rec) and then Base_Type (Rec) = Rec then
+ if not Placed_Component then
+ ADC :=
+ Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
+ Error_Msg_N
+ ("?Bit_Order specification has no effect", ADC);
+ Error_Msg_N
+ ("\?since no component clauses were specified", ADC);
+
+ -- Here is where we do Ada 2005 processing for bit order (the
+ -- Ada 95 case was already taken care of above).
- if not Placed_Component and then Reverse_Bit_Order (Rec) then
- ADC := Get_Attribute_Definition_Clause (Rec, Attribute_Bit_Order);
- Error_Msg_N ("?Bit_Order specification has no effect", ADC);
- Error_Msg_N ("\?since no component clauses were specified", ADC);
+ elsif Ada_Version >= Ada_05 then
+ Adjust_Record_For_Reverse_Bit_Order (Rec);
+ end if;
end if;
- -- Check for useless pragma Pack when all components placed
+ -- Check for useless pragma Pack when all components placed. We only
+ -- do this check for record types, not subtypes, since a subtype may
+ -- have all its components placed, and it still makes perfectly good
+ -- sense to pack other subtypes or the parent type.
- if Is_Packed (Rec)
+ if Ekind (Rec) = E_Record_Type
+ and then Is_Packed (Rec)
and then not Unplaced_Component
- and then Warn_On_Redundant_Constructs
then
- Error_Msg_N
- ("?pragma Pack has no effect, no unplaced components",
- Get_Rep_Pragma (Rec, Name_Pack));
+ -- Reset packed status. Probably not necessary, but we do it
+ -- so that there is no chance of the back end doing something
+ -- strange with this redundant indication of packing.
+
Set_Is_Packed (Rec, False);
+
+ -- Give warning if redundant constructs warnings on
+
+ if Warn_On_Redundant_Constructs then
+ Error_Msg_N
+ ("?pragma Pack has no effect, no unplaced components",
+ Get_Rep_Pragma (Rec, Name_Pack));
+ end if;
end if;
- -- If this is the record corresponding to a remote type,
- -- freeze the remote type here since that is what we are
- -- semantically freeing. This prevents having the freeze node
- -- for that type in an inner scope.
+ -- If this is the record corresponding to a remote type, freeze the
+ -- remote type here since that is what we are semantically freezing.
+ -- This prevents the freeze node for that type in an inner scope.
-- Also, Check for controlled components and unchecked unions.
- -- Finally, enforce the restriction that access attributes with
- -- a current instance prefix can only apply to limited types.
+ -- Finally, enforce the restriction that access attributes with a
+ -- current instance prefix can only apply to limited types.
if Ekind (Rec) = E_Record_Type then
-
if Present (Corresponding_Remote_Type (Rec)) then
Freeze_And_Append
(Corresponding_Remote_Type (Rec), Loc, Result);
end if;
Comp := First_Component (Rec);
-
while Present (Comp) loop
if Has_Controlled_Component (Etype (Comp))
or else (Chars (Comp) /= Name_uParent
if Has_Per_Object_Constraint (Comp)
and then not Is_Limited_Type (Rec)
then
- -- Scan component declaration for likely misuses of
- -- current instance, either in a constraint or in a
- -- default expression.
+ -- Scan component declaration for likely misuses of current
+ -- instance, either in a constraint or a default expression.
Check_Current_Instance (Parent (Comp));
end if;
Set_Component_Alignment_If_Not_Set (Rec);
- -- For first subtypes, check if there are any fixed-point
- -- fields with component clauses, where we must check the size.
- -- This is not done till the freeze point, since for fixed-point
- -- types, we do not know the size until the type is frozen.
+ -- For first subtypes, check if there are any fixed-point fields with
+ -- component clauses, where we must check the size. This is not done
+ -- till the freeze point, since for fixed-point types, we do not know
+ -- the size until the type is frozen. Similar processing applies to
+ -- bit packed arrays.
if Is_First_Subtype (Rec) then
Comp := First_Component (Rec);
while Present (Comp) loop
if Present (Component_Clause (Comp))
- and then Is_Fixed_Point_Type (Etype (Comp))
+ and then (Is_Fixed_Point_Type (Etype (Comp))
+ or else
+ Is_Bit_Packed_Array (Etype (Comp)))
then
Check_Size
- (Component_Clause (Comp),
+ (Component_Name (Component_Clause (Comp)),
Etype (Comp),
Esize (Comp),
Junk);
-- Start of processing for Freeze_Entity
begin
- -- Do not freeze if already frozen since we only need one freeze node.
+ -- We are going to test for various reasons why this entity need not be
+ -- frozen here, but in the case of an Itype that's defined within a
+ -- record, that test actually applies to the record.
+
+ if Is_Itype (E) and then Is_Record_Type (Scope (E)) then
+ Test_E := Scope (E);
+ elsif Is_Itype (E) and then Present (Underlying_Type (Scope (E)))
+ and then Is_Record_Type (Underlying_Type (Scope (E)))
+ then
+ Test_E := Underlying_Type (Scope (E));
+ end if;
+
+ -- Do not freeze if already frozen since we only need one freeze node
if Is_Frozen (E) then
return No_List;
- -- It is improper to freeze an external entity within a generic
- -- because its freeze node will appear in a non-valid context.
- -- ??? We should probably freeze the entity at that point and insert
- -- the freeze node in a proper place but this proper place is not
- -- easy to find, and the proper scope is not easy to restore. For
- -- now, just wait to get out of the generic to freeze ???
+ -- It is improper to freeze an external entity within a generic because
+ -- its freeze node will appear in a non-valid context. The entity will
+ -- be frozen in the proper scope after the current generic is analyzed.
- elsif Inside_A_Generic and then External_Ref_In_Generic (E) then
+ elsif Inside_A_Generic and then External_Ref_In_Generic (Test_E) then
return No_List;
-- Do not freeze a global entity within an inner scope created during
-- must be diagnosed (see e.g. 1522-005). If the enclosing subprogram
-- comes from source, or is a generic instance, then the freeze point
-- is the one mandated by the language. and we freze the entity.
+ -- A subprogram that is a child unit body that acts as a spec does not
+ -- have a spec that comes from source, but can only come from source.
- elsif In_Open_Scopes (Scope (E))
- and then Scope (E) /= Current_Scope
- and then Ekind (E) /= E_Constant
+ elsif In_Open_Scopes (Scope (Test_E))
+ and then Scope (Test_E) /= Current_Scope
+ and then Ekind (Test_E) /= E_Constant
then
declare
S : Entity_Id := Current_Scope;
if Is_Overloadable (S) then
if Comes_From_Source (S)
or else Is_Generic_Instance (S)
+ or else Is_Child_Unit (S)
then
exit;
else
S := Scope (S);
end loop;
end;
+
+ -- Similarly, an inlined instance body may make reference to global
+ -- entities, but these references cannot be the proper freezing point
+ -- for them, and the the absence of inlining freezing will take place
+ -- in their own scope. Normally instance bodies are analyzed after
+ -- the enclosing compilation, and everything has been frozen at the
+ -- proper place, but with front-end inlining an instance body is
+ -- compiled before the end of the enclosing scope, and as a result
+ -- out-of-order freezing must be prevented.
+
+ elsif Front_End_Inlining
+ and then In_Instance_Body
+ and then Present (Scope (Test_E))
+ then
+ declare
+ S : Entity_Id := Scope (Test_E);
+
+ begin
+ while Present (S) loop
+ if Is_Generic_Instance (S) then
+ exit;
+ else
+ S := Scope (S);
+ end if;
+ end loop;
+
+ if No (S) then
+ return No_List;
+ end if;
+ end;
end if;
-- Here to freeze the entity
then
Set_Encoded_Interface_Name
(E, Get_Default_External_Name (E));
+
+ -- Special processing for atomic objects appearing in object decls
+
+ elsif Is_Atomic (E)
+ and then Nkind (Parent (E)) = N_Object_Declaration
+ and then Present (Expression (Parent (E)))
+ then
+ declare
+ Expr : constant Node_Id := Expression (Parent (E));
+
+ begin
+ -- If expression is an aggregate, assign to a temporary to
+ -- ensure that the actual assignment is done atomically rather
+ -- than component-wise (the assignment to the temp may be done
+ -- component-wise, but that is harmless.
+
+ if Nkind (Expr) = N_Aggregate then
+ Expand_Atomic_Aggregate (Expr, Etype (E));
+
+ -- If the expression is a reference to a record or array object
+ -- entity, then reset Is_True_Constant to False so that the
+ -- compiler will not optimize away the intermediate object,
+ -- which we need in this case for the same reason (to ensure
+ -- that the actual assignment is atomic, rather than
+ -- component-wise).
+
+ elsif Is_Entity_Name (Expr)
+ and then (Is_Record_Type (Etype (Expr))
+ or else
+ Is_Array_Type (Etype (Expr)))
+ then
+ Set_Is_True_Constant (Entity (Expr), False);
+ end if;
+ end;
end if;
-- For a subprogram, freeze all parameter types and also the return
- -- type (RM 13.14(13)). However skip this for internal subprograms.
+ -- type (RM 13.14(14)). However skip this for internal subprograms.
-- This is also the point where any extra formal parameters are
-- created since we now know whether the subprogram will use
-- a foreign convention.
if Is_Subprogram (E) then
-
if not Is_Internal (E) then
-
declare
- F_Type : Entity_Id;
+ F_Type : Entity_Id;
+ Warn_Node : Node_Id;
function Is_Fat_C_Ptr_Type (T : Entity_Id) return Boolean;
-- Determines if given type entity is a fat pointer type
-- Loop through formals
Formal := First_Formal (E);
-
while Present (Formal) loop
-
F_Type := Etype (Formal);
Freeze_And_Append (F_Type, Loc, Result);
-- an artifact of our need to regard the end of an
-- instantiation as a freeze point. Otherwise it is
-- a definite error.
+
-- and then not Is_Wrapper_Package (Current_Scope) ???
if In_Instance then
-- Check bad use of fat C pointer
- if Is_Fat_C_Ptr_Type (F_Type) then
+ if Warn_On_Export_Import and then
+ Is_Fat_C_Ptr_Type (F_Type)
+ then
Error_Msg_Qual_Level := 1;
Error_Msg_N
("?type of & does not correspond to C pointer",
and then not Is_Imported (E)
and then Is_Array_Type (F_Type)
and then not Is_Constrained (F_Type)
+ and then Warn_On_Export_Import
then
Error_Msg_Qual_Level := 1;
- Error_Msg_N
+
+ -- If this is an inherited operation, place the
+ -- warning on the derived type declaration, rather
+ -- than on the original subprogram.
+
+ if Nkind (Original_Node (Parent (E))) =
+ N_Full_Type_Declaration
+ then
+ Warn_Node := Parent (E);
+
+ if Formal = First_Formal (E) then
+ Error_Msg_NE
+ ("?in inherited operation&", Warn_Node, E);
+ end if;
+ else
+ Warn_Node := Formal;
+ end if;
+
+ Error_Msg_NE
("?type of argument& is unconstrained array",
- Formal);
- Error_Msg_N
+ Warn_Node, Formal);
+ Error_Msg_NE
("?foreign caller must pass bounds explicitly",
- Formal);
+ Warn_Node, Formal);
Error_Msg_Qual_Level := 0;
end if;
+ -- Ada 2005 (AI-326): Check wrong use of tag incomplete
+ -- types with unknown discriminants. For example:
+
+ -- type T (<>) is tagged;
+ -- procedure P (X : access T); -- ERROR
+ -- procedure P (X : T); -- ERROR
+
+ if not From_With_Type (F_Type) then
+ if Is_Access_Type (F_Type) then
+ F_Type := Designated_Type (F_Type);
+ end if;
+
+ if Ekind (F_Type) = E_Incomplete_Type
+ and then Is_Tagged_Type (F_Type)
+ and then not Is_Class_Wide_Type (F_Type)
+ and then No (Full_View (F_Type))
+ and then Unknown_Discriminants_Present
+ (Parent (F_Type))
+ and then No (Stored_Constraint (F_Type))
+ then
+ Error_Msg_N
+ ("(Ada 2005): invalid use of unconstrained tagged"
+ & " incomplete type", E);
+
+ elsif Ekind (F_Type) = E_Subprogram_Type then
+ Freeze_And_Append (F_Type, Loc, Result);
+ end if;
+ end if;
+
Next_Formal (Formal);
end loop;
if Ekind (E) = E_Function then
Freeze_And_Append (Etype (E), Loc, Result);
- if Is_Fat_C_Ptr_Type (Etype (E)) then
+ if Warn_On_Export_Import
+ and then Is_Fat_C_Ptr_Type (Etype (E))
+ then
Error_Msg_N
("?return type of& does not correspond to C pointer",
E);
and then not Is_Constrained (Etype (E))
and then not Is_Imported (E)
and then Convention (E) in Foreign_Convention
+ and then Warn_On_Export_Import
then
Error_Msg_N
- ("foreign convention function may not " &
+ ("?foreign convention function& should not " &
"return unconstrained array", E);
+
+ -- Ada 2005 (AI-326): Check wrong use of tagged
+ -- incomplete type
+ --
+ -- type T is tagged;
+ -- function F (X : Boolean) return T; -- ERROR
+
+ elsif Ekind (Etype (E)) = E_Incomplete_Type
+ and then Is_Tagged_Type (Etype (E))
+ and then No (Full_View (Etype (E)))
+ then
+ Error_Msg_N
+ ("(Ada 2005): invalid use of tagged incomplete type",
+ E);
end if;
end if;
end;
Freeze_And_Append (Alias (E), Loc, Result);
end if;
- -- If the return type requires a transient scope, and we are on
- -- a target allowing functions to return with a depressed stack
- -- pointer, then we mark the function as requiring this treatment.
-
- if Ekind (E) = E_Function
- and then Functions_Return_By_DSP_On_Target
- and then Requires_Transient_Scope (Etype (E))
- then
- Set_Function_Returns_With_DSP (E);
- end if;
-
if not Is_Internal (E) then
Freeze_Subprogram (E);
end if;
Freeze_And_Append (Etype (E), Loc, Result);
end if;
- -- For object created by object declaration, perform required
- -- categorization (preelaborate and pure) checks. Defer these
- -- checks to freeze time since pragma Import inhibits default
- -- initialization and thus pragma Import affects these checks.
+ -- Special processing for objects created by object declaration
if Nkind (Declaration_Node (E)) = N_Object_Declaration then
+
+ -- For object created by object declaration, perform required
+ -- categorization (preelaborate and pure) checks. Defer these
+ -- checks to freeze time since pragma Import inhibits default
+ -- initialization and thus pragma Import affects these checks.
+
Validate_Object_Declaration (Declaration_Node (E));
+
+ -- If there is an address clause, check it is valid
+
+ Check_Address_Clause (E);
+
+ -- For imported objects, set Is_Public unless there is also
+ -- an address clause, which means that there is no external
+ -- symbol needed for the Import (Is_Public may still be set
+ -- for other unrelated reasons). Note that we delayed this
+ -- processing till freeze time so that we can be sure not
+ -- to set the flag if there is an address clause. If there
+ -- is such a clause, then the only purpose of the import
+ -- pragma is to suppress implicit initialization.
+
+ if Is_Imported (E)
+ and then No (Address_Clause (E))
+ then
+ Set_Is_Public (E);
+ end if;
end if;
-- Check that a constant which has a pragma Volatile[_Components]
-- inherited the indication from elsewhere (e.g. an address
-- clause, which is not good enough in RM terms!)
- if Present (Get_Rep_Pragma (E, Name_Atomic)) or else
- Present (Get_Rep_Pragma (E, Name_Atomic_Components)) or else
- Present (Get_Rep_Pragma (E, Name_Volatile)) or else
- Present (Get_Rep_Pragma (E, Name_Volatile_Components))
+ if Has_Rep_Pragma (E, Name_Atomic)
+ or else
+ Has_Rep_Pragma (E, Name_Atomic_Components)
then
Error_Msg_N
- ("stand alone atomic/volatile constant must be imported",
- E);
+ ("stand alone atomic constant must be " &
+ "imported ('R'M 'C.6(13))", E);
+
+ elsif Has_Rep_Pragma (E, Name_Volatile)
+ or else
+ Has_Rep_Pragma (E, Name_Volatile_Components)
+ then
+ Error_Msg_N
+ ("stand alone volatile constant must be " &
+ "imported ('R'M 'C.6(13))", E);
end if;
end if;
-- Case of a type or subtype being frozen
else
+ -- Check preelaborable initialization for full type completing a
+ -- private type for which pragma Preelaborable_Initialization given.
+
+ if Must_Have_Preelab_Init (E)
+ and then not Has_Preelaborable_Initialization (E)
+ then
+ Error_Msg_N
+ ("full view of & does not have preelaborable initialization", E);
+ end if;
+
-- The type may be defined in a generic unit. This can occur when
-- freezing a generic function that returns the type (which is
-- defined in a parent unit). It is clearly meaningless to freeze
Freeze_And_Append (Atype, Loc, Result);
-- Otherwise freeze the base type of the entity before
- -- freezing the entity itself, (RM 13.14(14)).
+ -- freezing the entity itself, (RM 13.14(15)).
elsif E /= Base_Type (E) then
Freeze_And_Append (Base_Type (E), Loc, Result);
end if;
- -- For a derived type, freeze its parent type first (RM 13.14(14))
+ -- For a derived type, freeze its parent type first (RM 13.14(15))
elsif Is_Derived_Type (E) then
Freeze_And_Append (Etype (E), Loc, Result);
end if;
-- For array type, freeze index types and component type first
- -- before freezing the array (RM 13.14(14)).
+ -- before freezing the array (RM 13.14(15)).
if Is_Array_Type (E) then
declare
- Ctyp : constant Entity_Id := Component_Type (E);
+ Ctyp : constant Entity_Id := Component_Type (E);
+ Pnod : Node_Id;
Non_Standard_Enum : Boolean := False;
-- Set true if any of the index types is an enumeration
Next_Index (Indx);
end loop;
- -- For base type, propagate flags for component type
+ -- Processing that is done only for base types
if Ekind (E) = E_Array_Type then
+
+ -- Propagate flags for component type
+
if Is_Controlled (Component_Type (E))
or else Has_Controlled_Component (Ctyp)
then
if Has_Unchecked_Union (Component_Type (E)) then
Set_Has_Unchecked_Union (E);
end if;
- end if;
- -- If packing was requested or if the component size was set
- -- explicitly, then see if bit packing is required. This
- -- processing is only done for base types, since all the
- -- representation aspects involved are type-related. This
- -- is not just an optimization, if we start processing the
- -- subtypes, they intefere with the settings on the base
- -- type (this is because Is_Packed has a slightly different
- -- meaning before and after freezing).
+ -- If packing was requested or if the component size was set
+ -- explicitly, then see if bit packing is required. This
+ -- processing is only done for base types, since all the
+ -- representation aspects involved are type-related. This
+ -- is not just an optimization, if we start processing the
+ -- subtypes, they intefere with the settings on the base
+ -- type (this is because Is_Packed has a slightly different
+ -- meaning before and after freezing).
- if E = Base_Type (E) then
declare
Csiz : Uint;
Esiz : Uint;
Set_Component_Size (Base_Type (E), Csiz);
+ -- Check for base type of 8,16,32 bits, where the
+ -- subtype has a length one less than the base type
+ -- and is unsigned (e.g. Natural subtype of Integer)
+
+ -- In such cases, if a component size was not set
+ -- explicitly, then generate a warning.
+
+ if Has_Pragma_Pack (E)
+ and then not Has_Component_Size_Clause (E)
+ and then
+ (Csiz = 7 or else Csiz = 15 or else Csiz = 31)
+ and then Esize (Base_Type (Ctyp)) = Csiz + 1
+ then
+ Error_Msg_Uint_1 := Csiz;
+ Pnod :=
+ Get_Rep_Pragma (First_Subtype (E), Name_Pack);
+
+ if Present (Pnod) then
+ Error_Msg_N
+ ("pragma Pack causes component size to be ^?",
+ Pnod);
+ Error_Msg_N
+ ("\use Component_Size to set desired value",
+ Pnod);
+ end if;
+ end if;
+
-- Actual packing is not needed for 8,16,32,64
-- Also not needed for 24 if alignment is 1
end if;
end if;
end;
+
+ -- Processing that is done only for subtypes
+
+ else
+ -- Acquire alignment from base type
+
+ if Unknown_Alignment (E) then
+ Set_Alignment (E, Alignment (Base_Type (E)));
+ end if;
+ end if;
+
+ -- For bit-packed arrays, check the size
+
+ if Is_Bit_Packed_Array (E)
+ and then Known_Esize (E)
+ then
+ declare
+ Discard : Boolean;
+ SizC : constant Node_Id := Size_Clause (E);
+
+ begin
+ -- It is not clear if it is possible to have no size
+ -- clause at this stage, but this is not worth worrying
+ -- about. Post the error on the entity name in the size
+ -- clause if present, else on the type entity itself.
+
+ if Present (SizC) then
+ Check_Size (Name (SizC), E, Esize (E), Discard);
+ else
+ Check_Size (E, E, Esize (E), Discard);
+ end if;
+ end;
end if;
+ -- Check one common case of a size given where the array
+ -- needs to be packed, but was not so the size cannot be
+ -- honored. This would of course be caught by the backend,
+ -- and indeed we don't catch all cases. The point is that
+ -- we can give a better error message in those cases that
+ -- we do catch with the circuitry here.
+
+ declare
+ Lo, Hi : Node_Id;
+ Ctyp : constant Entity_Id := Component_Type (E);
+
+ begin
+ if Present (Size_Clause (E))
+ and then Known_Static_Esize (E)
+ and then not Is_Bit_Packed_Array (E)
+ and then not Has_Pragma_Pack (E)
+ and then Number_Dimensions (E) = 1
+ and then not Has_Component_Size_Clause (E)
+ and then Known_Static_Esize (Ctyp)
+ then
+ Get_Index_Bounds (First_Index (E), Lo, Hi);
+
+ if Compile_Time_Known_Value (Lo)
+ and then Compile_Time_Known_Value (Hi)
+ and then Known_Static_RM_Size (Ctyp)
+ and then RM_Size (Ctyp) < 64
+ then
+ declare
+ Lov : constant Uint := Expr_Value (Lo);
+ Hiv : constant Uint := Expr_Value (Hi);
+ Len : constant Uint :=
+ UI_Max (Uint_0, Hiv - Lov + 1);
+ Rsiz : constant Uint := RM_Size (Ctyp);
+
+ -- What we are looking for here is the situation
+ -- where the Esize given would be exactly right
+ -- if there was a pragma Pack (resulting in the
+ -- component size being the same as the RM_Size).
+ -- Furthermore, the component type size must be
+ -- an odd size (not a multiple of storage unit)
+
+ begin
+ if Esize (E) = Len * Rsiz
+ and then Rsiz mod System_Storage_Unit /= 0
+ then
+ Error_Msg_NE
+ ("size given for& too small",
+ Size_Clause (E), E);
+ Error_Msg_N
+ ("\explicit pragma Pack is required",
+ Size_Clause (E));
+ end if;
+ end;
+ end if;
+ end if;
+ end;
+
-- If any of the index types was an enumeration type with
-- a non-standard rep clause, then we indicate that the
-- array type is always packed (even if it is not bit packed).
Set_Has_Non_Standard_Rep (Base_Type (E));
Set_Is_Packed (Base_Type (E));
end if;
- end;
- Set_Component_Alignment_If_Not_Set (E);
+ Set_Component_Alignment_If_Not_Set (E);
- -- If the array is packed, we must create the packed array
- -- type to be used to actually implement the type. This is
- -- only needed for real array types (not for string literal
- -- types, since they are present only for the front end).
+ -- If the array is packed, we must create the packed array
+ -- type to be used to actually implement the type. This is
+ -- only needed for real array types (not for string literal
+ -- types, since they are present only for the front end).
- if Is_Packed (E)
- and then Ekind (E) /= E_String_Literal_Subtype
- then
- Create_Packed_Array_Type (E);
- Freeze_And_Append (Packed_Array_Type (E), Loc, Result);
+ if Is_Packed (E)
+ and then Ekind (E) /= E_String_Literal_Subtype
+ then
+ Create_Packed_Array_Type (E);
+ Freeze_And_Append (Packed_Array_Type (E), Loc, Result);
- -- Size information of packed array type is copied to the
- -- array type, since this is really the representation.
+ -- Size information of packed array type is copied to the
+ -- array type, since this is really the representation. But
+ -- do not override explicit existing size values.
- Set_Size_Info (E, Packed_Array_Type (E));
- Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
- end if;
+ if not Has_Size_Clause (E) then
+ Set_Esize (E, Esize (Packed_Array_Type (E)));
+ Set_RM_Size (E, RM_Size (Packed_Array_Type (E)));
+ end if;
- -- For a class wide type, the corresponding specific type is
- -- frozen as well (RM 13.14(14))
+ if not Has_Alignment_Clause (E) then
+ Set_Alignment (E, Alignment (Packed_Array_Type (E)));
+ end if;
+ end if;
+
+ -- For non-packed arrays set the alignment of the array
+ -- to the alignment of the component type if it is unknown.
+ -- Skip this in the atomic case, since atomic arrays may
+ -- need larger alignments.
+
+ if not Is_Packed (E)
+ and then Unknown_Alignment (E)
+ and then Known_Alignment (Ctyp)
+ and then Known_Static_Component_Size (E)
+ and then Known_Static_Esize (Ctyp)
+ and then Esize (Ctyp) = Component_Size (E)
+ and then not Is_Atomic (E)
+ then
+ Set_Alignment (E, Alignment (Component_Type (E)));
+ end if;
+ end;
+
+ -- For a class-wide type, the corresponding specific type is
+ -- frozen as well (RM 13.14(15))
elsif Is_Class_Wide_Type (E) then
Freeze_And_Append (Root_Type (E), Loc, Result);
if Is_Itype (E)
and then Is_Compilation_Unit (Scope (E))
then
-
declare
- Ref : Node_Id := Make_Itype_Reference (Loc);
+ Ref : constant Node_Id := Make_Itype_Reference (Loc);
begin
Set_Itype (Ref, E);
end;
end if;
- -- For record (sub)type, freeze all the component types (RM
- -- 13.14(14). We test for E_Record_(sub)Type here, rather than
+ -- The equivalent type associated with a class-wide subtype
+ -- needs to be frozen to ensure that its layout is done.
+ -- Class-wide subtypes are currently only frozen on targets
+ -- requiring front-end layout (see New_Class_Wide_Subtype
+ -- and Make_CW_Equivalent_Type in exp_util.adb).
+
+ if Ekind (E) = E_Class_Wide_Subtype
+ and then Present (Equivalent_Type (E))
+ then
+ Freeze_And_Append (Equivalent_Type (E), Loc, Result);
+ end if;
+
+ -- For a record (sub)type, freeze all the component types (RM
+ -- 13.14(15). We test for E_Record_(sub)Type here, rather than
-- using Is_Record_Type, because we don't want to attempt the
-- freeze for the case of a private type with record extension
-- (we will do that later when the full type is frozen).
Freeze_And_Append (Comp, Loc, Result);
elsif (Ekind (Comp)) /= E_Function then
+ if Is_Itype (Etype (Comp))
+ and then Underlying_Type (Scope (Etype (Comp))) = E
+ then
+ Undelay_Type (Etype (Comp));
+ end if;
+
Freeze_And_Append (Etype (Comp), Loc, Result);
end if;
Next_Entity (Comp);
end loop;
- -- Private types are required to point to the same freeze node
- -- as their corresponding full views. The freeze node itself
- -- has to point to the partial view of the entity (because
- -- from the partial view, we can retrieve the full view, but
- -- not the reverse). However, in order to freeze correctly,
- -- we need to freeze the full view. If we are freezing at the
- -- end of a scope (or within the scope of the private type),
- -- the partial and full views will have been swapped, the
- -- full view appears first in the entity chain and the swapping
- -- mechanism enusres that the pointers are properly set (on
- -- scope exit).
-
- -- If we encounter the partial view before the full view
- -- (e.g. when freezing from another scope), we freeze the
- -- full view, and then set the pointers appropriately since
- -- we cannot rely on swapping to fix things up (subtypes in an
- -- outer scope might not get swapped).
+ -- Private types are required to point to the same freeze node as
+ -- their corresponding full views. The freeze node itself has to
+ -- point to the partial view of the entity (because from the partial
+ -- view, we can retrieve the full view, but not the reverse).
+ -- However, in order to freeze correctly, we need to freeze the full
+ -- view. If we are freezing at the end of a scope (or within the
+ -- scope of the private type), the partial and full views will have
+ -- been swapped, the full view appears first in the entity chain and
+ -- the swapping mechanism ensures that the pointers are properly set
+ -- (on scope exit).
+
+ -- If we encounter the partial view before the full view (e.g. when
+ -- freezing from another scope), we freeze the full view, and then
+ -- set the pointers appropriately since we cannot rely on swapping to
+ -- fix things up (subtypes in an outer scope might not get swapped).
elsif Is_Incomplete_Or_Private_Type (E)
and then not Is_Generic_Type (E)
if Present (Full_View (E)) then
- -- If full view has already been frozen, then no
- -- further processing is required
+ -- If full view has already been frozen, then no further
+ -- processing is required
if Is_Frozen (Full_View (E)) then
Set_Freeze_Node (E, Empty);
Check_Debug_Info_Needed (E);
- -- Otherwise freeze full view and patch the pointers
+ -- Otherwise freeze full view and patch the pointers so that
+ -- the freeze node will elaborate both views in the back-end.
+
+ else
+ declare
+ Full : constant Entity_Id := Full_View (E);
+
+ begin
+ if Is_Private_Type (Full)
+ and then Present (Underlying_Full_View (Full))
+ then
+ Freeze_And_Append
+ (Underlying_Full_View (Full), Loc, Result);
+ end if;
- else
- if Is_Private_Type (Full_View (E))
- and then Present (Underlying_Full_View (Full_View (E)))
- then
- Freeze_And_Append
- (Underlying_Full_View (Full_View (E)), Loc, Result);
- end if;
+ Freeze_And_Append (Full, Loc, Result);
- Freeze_And_Append (Full_View (E), Loc, Result);
+ if Has_Delayed_Freeze (E) then
+ F_Node := Freeze_Node (Full);
- if Has_Delayed_Freeze (E) then
- F_Node := Freeze_Node (Full_View (E));
+ if Present (F_Node) then
+ Set_Freeze_Node (E, F_Node);
+ Set_Entity (F_Node, E);
- if Present (F_Node) then
- Set_Freeze_Node (E, F_Node);
- Set_Entity (F_Node, E);
- else
- -- {Incomplete,Private}_Subtypes
- -- with Full_Views constrained by discriminants
+ else
+ -- {Incomplete,Private}_Subtypes
+ -- with Full_Views constrained by discriminants
- Set_Has_Delayed_Freeze (E, False);
- Set_Freeze_Node (E, Empty);
+ Set_Has_Delayed_Freeze (E, False);
+ Set_Freeze_Node (E, Empty);
+ end if;
end if;
- end if;
+ end;
Check_Debug_Info_Needed (E);
end if;
- -- AI-117 requires that the convention of a partial view
- -- be the same as the convention of the full view. Note
- -- that this is a recognized breach of privacy, but it's
- -- essential for logical consistency of representation,
- -- and the lack of a rule in RM95 was an oversight.
+ -- AI-117 requires that the convention of a partial view be the
+ -- same as the convention of the full view. Note that this is a
+ -- recognized breach of privacy, but it's essential for logical
+ -- consistency of representation, and the lack of a rule in
+ -- RM95 was an oversight.
Set_Convention (E, Convention (Full_View (E)));
-- Size information is copied from the full view to the
-- incomplete or private view for consistency
- -- We skip this is the full view is not a type. This is
- -- very strange of course, and can only happen as a result
- -- of certain illegalities, such as a premature attempt to
- -- derive from an incomplete type.
+ -- We skip this is the full view is not a type. This is very
+ -- strange of course, and can only happen as a result of
+ -- certain illegalities, such as a premature attempt to derive
+ -- from an incomplete type.
if Is_Type (Full_View (E)) then
Set_Size_Info (E, Full_View (E));
Next_Formal (Formal);
end loop;
- -- If the return type requires a transient scope, and we are on
- -- a target allowing functions to return with a depressed stack
- -- pointer, then we mark the function as requiring this treatment.
+ Freeze_Subprogram (E);
+
+ -- Ada 2005 (AI-326): Check wrong use of tag incomplete type
+ --
+ -- type T is tagged;
+ -- type Acc is access function (X : T) return T; -- ERROR
- if Functions_Return_By_DSP_On_Target
- and then Requires_Transient_Scope (Etype (E))
+ if Ekind (Etype (E)) = E_Incomplete_Type
+ and then Is_Tagged_Type (Etype (E))
+ and then No (Full_View (Etype (E)))
then
- Set_Function_Returns_With_DSP (E);
+ Error_Msg_N
+ ("(Ada 2005): invalid use of tagged incomplete type", E);
end if;
- Freeze_Subprogram (E);
+ -- For access to a protected subprogram, freeze the equivalent type
+ -- (however this is not set if we are not generating code or if this
+ -- is an anonymous type used just for resolution).
- -- For access to a protected subprogram, freeze the equivalent
- -- type (however this is not set if we are not generating code)
- -- or if this is an anonymous type used just for resolution).
+ elsif Is_Access_Protected_Subprogram_Type (E) then
- elsif Ekind (E) = E_Access_Protected_Subprogram_Type
- and then Operating_Mode = Generate_Code
- and then Present (Equivalent_Type (E))
- then
- Freeze_And_Append (Equivalent_Type (E), Loc, Result);
+ -- AI-326: Check wrong use of tagged incomplete types
+
+ -- type T is tagged;
+ -- type As3D is access protected
+ -- function (X : Float) return T; -- ERROR
+
+ declare
+ Etyp : Entity_Id;
+
+ begin
+ Etyp := Etype (Directly_Designated_Type (E));
+
+ if Is_Class_Wide_Type (Etyp) then
+ Etyp := Etype (Etyp);
+ end if;
+
+ if Ekind (Etyp) = E_Incomplete_Type
+ and then Is_Tagged_Type (Etyp)
+ and then No (Full_View (Etyp))
+ then
+ Error_Msg_N
+ ("(Ada 2005): invalid use of tagged incomplete type", E);
+ end if;
+ end;
+
+ if Present (Equivalent_Type (E)) then
+ Freeze_And_Append (Equivalent_Type (E), Loc, Result);
+ end if;
end if;
-- Generic types are never seen by the back-end, and are also not
if Is_Fixed_Point_Type (E) then
Freeze_Fixed_Point_Type (E);
- elsif Is_Enumeration_Type (E) then
- Freeze_Enumeration_Type (E);
+ -- Some error checks required for ordinary fixed-point type. Defer
+ -- these till the freeze-point since we need the small and range
+ -- values. We only do these checks for base types
- elsif Is_Integer_Type (E) then
- Adjust_Esize_For_Alignment (E);
+ if Is_Ordinary_Fixed_Point_Type (E)
+ and then E = Base_Type (E)
+ then
+ if Small_Value (E) < Ureal_2_M_80 then
+ Error_Msg_Name_1 := Name_Small;
+ Error_Msg_N
+ ("`&''%` is too small, minimum is 2.0'*'*(-80)", E);
- elsif Is_Access_Type (E)
- and then No (Associated_Storage_Pool (E))
- then
- Check_Restriction (No_Standard_Storage_Pools, E);
- end if;
+ elsif Small_Value (E) > Ureal_2_80 then
+ Error_Msg_Name_1 := Name_Small;
+ Error_Msg_N
+ ("`&''%` is too large, maximum is 2.0'*'*80", E);
+ end if;
- -- If the current entity is an array or record subtype and has
- -- discriminants used to constrain it, it must not freeze, because
- -- Freeze_Entity nodes force Gigi to process the frozen type.
+ if Expr_Value_R (Type_Low_Bound (E)) < Ureal_M_10_36 then
+ Error_Msg_Name_1 := Name_First;
+ Error_Msg_N
+ ("`&''%` is too small, minimum is -10.0'*'*36", E);
+ end if;
- if Is_Composite_Type (E) then
+ if Expr_Value_R (Type_High_Bound (E)) > Ureal_10_36 then
+ Error_Msg_Name_1 := Name_Last;
+ Error_Msg_N
+ ("`&''%` is too large, maximum is 10.0'*'*36", E);
+ end if;
+ end if;
- if Is_Array_Type (E) then
+ elsif Is_Enumeration_Type (E) then
+ Freeze_Enumeration_Type (E);
- declare
- Index : Node_Id := First_Index (E);
- Expr1 : Node_Id;
- Expr2 : Node_Id;
+ elsif Is_Integer_Type (E) then
+ Adjust_Esize_For_Alignment (E);
- begin
- while Present (Index) loop
- if Etype (Index) /= Any_Type then
- Get_Index_Bounds (Index, Expr1, Expr2);
+ elsif Is_Access_Type (E) then
- for J in 1 .. 2 loop
- if Nkind (Expr1) = N_Identifier
- and then Ekind (Entity (Expr1)) = E_Discriminant
- then
- Set_Has_Delayed_Freeze (E, False);
- Set_Freeze_Node (E, Empty);
- Check_Debug_Info_Needed (E);
- return Result;
- end if;
+ -- Check restriction for standard storage pool
- Expr1 := Expr2;
- end loop;
- end if;
+ if No (Associated_Storage_Pool (E)) then
+ Check_Restriction (No_Standard_Storage_Pools, E);
+ end if;
- Next_Index (Index);
- end loop;
- end;
+ -- Deal with error message for pure access type. This is not an
+ -- error in Ada 2005 if there is no pool (see AI-366).
- elsif Has_Discriminants (E)
- and Is_Constrained (E)
+ if Is_Pure_Unit_Access_Type (E)
+ and then (Ada_Version < Ada_05
+ or else not No_Pool_Assigned (E))
then
+ Error_Msg_N ("named access type not allowed in pure unit", E);
+ end if;
+ end if;
- declare
- Constraint : Elmt_Id;
- Expr : Node_Id;
- begin
- Constraint := First_Elmt (Discriminant_Constraint (E));
-
- while Present (Constraint) loop
-
- Expr := Node (Constraint);
- if Nkind (Expr) = N_Identifier
- and then Ekind (Entity (Expr)) = E_Discriminant
- then
- Set_Has_Delayed_Freeze (E, False);
- Set_Freeze_Node (E, Empty);
- Check_Debug_Info_Needed (E);
- return Result;
- end if;
-
- Next_Elmt (Constraint);
- end loop;
- end;
+ -- Case of composite types
- end if;
+ if Is_Composite_Type (E) then
- -- AI-117 requires that all new primitives of a tagged type
- -- must inherit the convention of the full view of the type.
- -- Inherited and overriding operations are defined to inherit
- -- the convention of their parent or overridden subprogram
- -- (also specified in AI-117), and that will have occurred
- -- earlier (in Derive_Subprogram and New_Overloaded_Entity).
- -- Here we set the convention of primitives that are still
- -- convention Ada, which will ensure that any new primitives
- -- inherit the type's convention. Class-wide types can have
- -- a foreign convention inherited from their specific type,
- -- but are excluded from this since they don't have any
- -- associated primitives.
+ -- AI-117 requires that all new primitives of a tagged type must
+ -- inherit the convention of the full view of the type. Inherited
+ -- and overriding operations are defined to inherit the convention
+ -- of their parent or overridden subprogram (also specified in
+ -- AI-117), which will have occurred earlier (in Derive_Subprogram
+ -- and New_Overloaded_Entity). Here we set the convention of
+ -- primitives that are still convention Ada, which will ensure
+ -- that any new primitives inherit the type's convention.
+ -- Class-wide types can have a foreign convention inherited from
+ -- their specific type, but are excluded from this since they
+ -- don't have any associated primitives.
if Is_Tagged_Type (E)
and then not Is_Class_Wide_Type (E)
then
declare
Prim_List : constant Elist_Id := Primitive_Operations (E);
- Prim : Elmt_Id := First_Elmt (Prim_List);
-
+ Prim : Elmt_Id;
begin
+ Prim := First_Elmt (Prim_List);
while Present (Prim) loop
if Convention (Node (Prim)) = Convention_Ada then
Set_Convention (Node (Prim), Convention (E));
end if;
end if;
- -- Now that all types from which E may depend are frozen, see
- -- if the size is known at compile time, if it must be unsigned,
- -- or if strict alignent is required
+ -- Generate primitive operation references for a tagged type
+
+ if Is_Tagged_Type (E)
+ and then not Is_Class_Wide_Type (E)
+ then
+ declare
+ Prim_List : Elist_Id;
+ Prim : Elmt_Id;
+ Ent : Entity_Id;
+ Aux_E : Entity_Id;
+
+ begin
+ -- Handle subtypes
+
+ if Ekind (E) = E_Protected_Subtype
+ or else Ekind (E) = E_Task_Subtype
+ then
+ Aux_E := Etype (E);
+ else
+ Aux_E := E;
+ end if;
+
+ -- Ada 2005 (AI-345): In case of concurrent type generate
+ -- reference to the wrapper that allow us to dispatch calls
+ -- through their implemented abstract interface types.
+
+ -- The check for Present here is to protect against previously
+ -- reported critical errors.
+
+ if Is_Concurrent_Type (Aux_E)
+ and then Present (Corresponding_Record_Type (Aux_E))
+ then
+ Prim_List := Primitive_Operations
+ (Corresponding_Record_Type (Aux_E));
+ else
+ Prim_List := Primitive_Operations (Aux_E);
+ end if;
+
+ -- Loop to generate references for primitive operations
+
+ if Present (Prim_List) then
+ Prim := First_Elmt (Prim_List);
+ while Present (Prim) loop
+
+ -- If the operation is derived, get the original for
+ -- cross-reference purposes (it is the original for
+ -- which we want the xref, and for which the comes
+ -- from source test needs to be performed).
+
+ Ent := Node (Prim);
+ while Present (Alias (Ent)) loop
+ Ent := Alias (Ent);
+ end loop;
+
+ Generate_Reference (E, Ent, 'p', Set_Ref => False);
+ Next_Elmt (Prim);
+ end loop;
+ end if;
+ end;
+ end if;
+
+ -- Now that all types from which E may depend are frozen, see if the
+ -- size is known at compile time, if it must be unsigned, or if
+ -- strict alignent is required
Check_Compile_Time_Size (E);
Check_Unsigned_Type (E);
if Has_Size_Clause (E)
and then not Size_Known_At_Compile_Time (E)
then
- Error_Msg_N
- ("size clause not allowed for variable length type",
- Size_Clause (E));
+ -- Supress this message if errors posted on E, even if we are
+ -- in all errors mode, since this is often a junk message
+
+ if not Error_Posted (E) then
+ Error_Msg_N
+ ("size clause not allowed for variable length type",
+ Size_Clause (E));
+ end if;
end if;
-- Remaining process is to set/verify the representation information,
-- in particular the size and alignment values. This processing is
-- not required for generic types, since generic types do not play
-- any part in code generation, and so the size and alignment values
- -- for suhc types are irrelevant.
+ -- for such types are irrelevant.
if Is_Generic_Type (E) then
return Result;
Append (F_Node, Result);
end if;
+ -- A final pass over record types with discriminants. If the type
+ -- has an incomplete declaration, there may be constrained access
+ -- subtypes declared elsewhere, which do not depend on the discrimi-
+ -- nants of the type, and which are used as component types (i.e.
+ -- the full view is a recursive type). The designated types of these
+ -- subtypes can only be elaborated after the type itself, and they
+ -- need an itype reference.
+
+ if Ekind (E) = E_Record_Type
+ and then Has_Discriminants (E)
+ then
+ declare
+ Comp : Entity_Id;
+ IR : Node_Id;
+ Typ : Entity_Id;
+
+ begin
+ Comp := First_Component (E);
+
+ while Present (Comp) loop
+ Typ := Etype (Comp);
+
+ if Ekind (Comp) = E_Component
+ and then Is_Access_Type (Typ)
+ and then Scope (Typ) /= E
+ and then Base_Type (Designated_Type (Typ)) = E
+ and then Is_Itype (Designated_Type (Typ))
+ then
+ IR := Make_Itype_Reference (Sloc (Comp));
+ Set_Itype (IR, Designated_Type (Typ));
+ Append (IR, Result);
+ end if;
+
+ Next_Component (Comp);
+ end loop;
+ end;
+ end if;
end if;
-- When a type is frozen, the first subtype of the type is frozen as
if Result = No_List then
Result := Empty_List;
end if;
-
- Generate_Subprogram_Descriptor_For_Imported_Subprogram
- (E, Result);
end if;
-
end if;
return Result;
and then Esize (Typ) < Standard_Integer_Size
then
Init_Esize (Typ, Standard_Integer_Size);
-
else
Adjust_Esize_For_Alignment (Typ);
end if;
function In_Exp_Body (N : Node_Id) return Boolean;
-- Given an N_Handled_Sequence_Of_Statements node N, determines whether
- -- it is the handled statement sequence of an expander generated
+ -- it is the handled statement sequence of an expander-generated
-- subprogram (init proc, or stream subprogram). If so, it returns
-- True, otherwise False.
+ -----------------
+ -- In_Exp_Body --
+ -----------------
+
function In_Exp_Body (N : Node_Id) return Boolean is
P : Node_Id;
P := Defining_Unit_Name (Specification (P));
if Nkind (P) = N_Defining_Identifier
- and then (Chars (P) = Name_uInit_Proc or else
- Chars (P) = Name_uInput or else
- Chars (P) = Name_uOutput or else
- Chars (P) = Name_uRead or else
- Chars (P) = Name_uWrite)
+ and then (Is_Init_Proc (P) or else
+ Is_TSS (P, TSS_Stream_Input) or else
+ Is_TSS (P, TSS_Stream_Output) or else
+ Is_TSS (P, TSS_Stream_Read) or else
+ Is_TSS (P, TSS_Stream_Write))
then
return True;
else
return False;
end if;
end if;
-
end In_Exp_Body;
-- Start of processing for Freeze_Expression
begin
- -- Immediate return if freezing is inhibited. This flag is set by
- -- the analyzer to stop freezing on generated expressions that would
- -- cause freezing if they were in the source program, but which are
- -- not supposed to freeze, since they are created.
+ -- Immediate return if freezing is inhibited. This flag is set by the
+ -- analyzer to stop freezing on generated expressions that would cause
+ -- freezing if they were in the source program, but which are not
+ -- supposed to freeze, since they are created.
if Must_Not_Freeze (N) then
return;
-- Freeze type of expression if not frozen already
- if Nkind (N) in N_Has_Etype
- and then not Is_Frozen (Etype (N))
- then
- Typ := Etype (N);
- else
- Typ := Empty;
+ Typ := Empty;
+
+ if Nkind (N) in N_Has_Etype then
+ if not Is_Frozen (Etype (N)) then
+ Typ := Etype (N);
+
+ -- Base type may be an derived numeric type that is frozen at
+ -- the point of declaration, but first_subtype is still unfrozen.
+
+ elsif not Is_Frozen (First_Subtype (Etype (N))) then
+ Typ := First_Subtype (Etype (N));
+ end if;
end if;
-- For entity name, freeze entity if not frozen already. A special
or else not Comes_From_Source (Entity (N)))
then
Nam := Entity (N);
-
else
Nam := Empty;
end if;
- -- For an allocator freeze designated type if not frozen already.
+ -- For an allocator freeze designated type if not frozen already
- -- For an aggregate whose component type is an access type, freeze
- -- the designated type now, so that its freeze does not appear within
- -- the loop that might be created in the expansion of the aggregate.
- -- If the designated type is a private type without full view, the
- -- expression cannot contain an allocator, so the type is not frozen.
+ -- For an aggregate whose component type is an access type, freeze the
+ -- designated type now, so that its freeze does not appear within the
+ -- loop that might be created in the expansion of the aggregate. If the
+ -- designated type is a private type without full view, the expression
+ -- cannot contain an allocator, so the type is not frozen.
Desig_Typ := Empty;
- case Nkind (N) is
+ case Nkind (N) is
when N_Allocator =>
Desig_Typ := Designated_Type (Etype (N));
when others =>
null;
-
end case;
if Desig_Typ /= Empty
loop
Parent_P := Parent (P);
- -- If we don't have a parent, then we are not in a well-formed
- -- tree. This is an unusual case, but there are some legitimate
- -- situations in which this occurs, notably when the expressions
- -- in the range of a type declaration are resolved. We simply
- -- ignore the freeze request in this case. Is this right ???
+ -- If we don't have a parent, then we are not in a well-formed tree.
+ -- This is an unusual case, but there are some legitimate situations
+ -- in which this occurs, notably when the expressions in the range of
+ -- a type declaration are resolved. We simply ignore the freeze
+ -- request in this case. Is this right ???
if No (Parent_P) then
return;
case Nkind (Parent_P) is
- -- A special test for the exception of (RM 13.14(8)) for the
- -- case of per-object expressions (RM 3.8(18)) occurring in a
- -- component definition or a discrete subtype definition. Note
- -- that we test for a component declaration which includes both
- -- cases we are interested in, and furthermore the tree does not
- -- have explicit nodes for either of these two constructs.
+ -- A special test for the exception of (RM 13.14(8)) for the case
+ -- of per-object expressions (RM 3.8(18)) occurring in component
+ -- definition or a discrete subtype definition. Note that we test
+ -- for a component declaration which includes both cases we are
+ -- interested in, and furthermore the tree does not have explicit
+ -- nodes for either of these two constructs.
when N_Component_Declaration =>
end if;
end if;
- -- If we have an enumeration literal that appears as the
- -- choice in the aggregate of an enumeration representation
- -- clause, then freezing does not occur (RM 13.14(9)).
+ -- If we have an enumeration literal that appears as the choice in
+ -- the aggregate of an enumeration representation clause, then
+ -- freezing does not occur (RM 13.14(10)).
when N_Enumeration_Representation_Clause =>
then
return;
- -- If enumeration literal appears as the name of a
- -- function which is the choice, then also do not freeze.
- -- This happens in the overloaded literal case, where the
+ -- If enumeration literal appears as the name of function
+ -- which is the choice, then also do not freeze. This
+ -- happens in the overloaded literal case, where the
-- enumeration literal is temporarily changed to a function
-- call for overloading analysis purposes.
when N_Handled_Sequence_Of_Statements =>
- -- An exception occurs when the sequence of statements is
- -- for an expander generated body that did not do the usual
- -- freeze all operation. In this case we usually want to
- -- freeze outside this body, not inside it, and we skip
- -- past the subprogram body that we are inside.
+ -- An exception occurs when the sequence of statements is for
+ -- an expander generated body that did not do the usual freeze
+ -- all operation. In this case we usually want to freeze
+ -- outside this body, not inside it, and we skip past the
+ -- subprogram body that we are inside.
if In_Exp_Body (Parent_P) then
exit;
end if;
- -- If parent is a body or a spec or a block, then the current
- -- node is a statement or declaration and we can insert the
- -- freeze node before it.
+ -- If parent is a body or a spec or a block, then the current node
+ -- is a statement or declaration and we can insert the freeze node
+ -- before it.
when N_Package_Specification |
N_Package_Body |
-- Note: The N_Loop_Statement is a special case. A type that
-- appears in the source can never be frozen in a loop (this
- -- occurs only because of a loop expanded by the expander),
- -- so we keep on going. Otherwise we terminate the search.
- -- Same is true of any entity which comes from source. (if they
- -- have a predefined type, that type does not appear to come
- -- from source, but the entity should not be frozen here).
+ -- occurs only because of a loop expanded by the expander), so we
+ -- keep on going. Otherwise we terminate the search. Same is true
+ -- of any entity which comes from source. (if they have predefined
+ -- type, that type does not appear to come from source, but the
+ -- entity should not be frozen here).
when N_Loop_Statement =>
exit when not Comes_From_Source (Etype (N))
P := Parent_P;
end loop;
- -- If the expression appears in a record or an initialization
- -- procedure, the freeze nodes are collected and attached to
- -- the current scope, to be inserted and analyzed on exit from
- -- the scope, to insure that generated entities appear in the
- -- correct scope. If the expression is a default for a discriminant
- -- specification, the scope is still void. The expression can also
- -- appear in the discriminant part of a private or concurrent type.
+ -- If the expression appears in a record or an initialization procedure,
+ -- the freeze nodes are collected and attached to the current scope, to
+ -- be inserted and analyzed on exit from the scope, to insure that
+ -- generated entities appear in the correct scope. If the expression is
+ -- a default for a discriminant specification, the scope is still void.
+ -- The expression can also appear in the discriminant part of a private
+ -- or concurrent type.
- -- The other case requiring this special handling is if we are in
- -- a default expression, since in that case we are about to freeze
- -- a static type, and the freeze scope needs to be the outer scope,
- -- not the scope of the subprogram with the default parameter.
+ -- If the expression appears in a constrained subcomponent of an
+ -- enclosing record declaration, the freeze nodes must be attached to
+ -- the outer record type so they can eventually be placed in the
+ -- enclosing declaration list.
+
+ -- The other case requiring this special handling is if we are in a
+ -- default expression, since in that case we are about to freeze a
+ -- static type, and the freeze scope needs to be the outer scope, not
+ -- the scope of the subprogram with the default parameter.
-- For default expressions in generic units, the Move_Freeze_Nodes
- -- mechanism (see sem_ch12.adb) takes care of placing them at the
- -- proper place, after the generic unit.
+ -- mechanism (see sem_ch12.adb) takes care of placing them at the proper
+ -- place, after the generic unit.
if (In_Def_Exp and not Inside_A_Generic)
or else Freeze_Outside
declare
Loc : constant Source_Ptr := Sloc (Current_Scope);
Freeze_Nodes : List_Id := No_List;
+ Pos : Int := Scope_Stack.Last;
begin
if Present (Desig_Typ) then
Freeze_And_Append (Nam, Loc, Freeze_Nodes);
end if;
- if Is_Non_Empty_List (Freeze_Nodes) then
+ -- The current scope may be that of a constrained component of
+ -- an enclosing record declaration, which is above the current
+ -- scope in the scope stack.
- if No (Scope_Stack.Table
- (Scope_Stack.Last).Pending_Freeze_Actions)
- then
- Scope_Stack.Table
- (Scope_Stack.Last).Pending_Freeze_Actions :=
+ if Is_Record_Type (Scope (Current_Scope)) then
+ Pos := Pos - 1;
+ end if;
+
+ if Is_Non_Empty_List (Freeze_Nodes) then
+ if No (Scope_Stack.Table (Pos).Pending_Freeze_Actions) then
+ Scope_Stack.Table (Pos).Pending_Freeze_Actions :=
Freeze_Nodes;
else
Append_List (Freeze_Nodes, Scope_Stack.Table
- (Scope_Stack.Last).Pending_Freeze_Actions);
+ (Pos).Pending_Freeze_Actions);
end if;
end if;
end;
-- Now we have the right place to do the freezing. First, a special
-- adjustment, if we are in default expression analysis mode, these
- -- freeze actions must not be thrown away (normally all inserted
- -- actions are thrown away in this mode. However, the freeze actions
- -- are from static expressions and one of the important reasons we
- -- are doing this special analysis is to get these freeze actions.
- -- Therefore we turn off the In_Default_Expression mode to propagate
- -- these freeze actions. This also means they get properly analyzed
- -- and expanded.
+ -- freeze actions must not be thrown away (normally all inserted actions
+ -- are thrown away in this mode. However, the freeze actions are from
+ -- static expressions and one of the important reasons we are doing this
+ -- special analysis is to get these freeze actions. Therefore we turn
+ -- off the In_Default_Expression mode to propagate these freeze actions.
+ -- This also means they get properly analyzed and expanded.
In_Default_Expression := False;
- -- Freeze the designated type of an allocator (RM 13.14(12))
+ -- Freeze the designated type of an allocator (RM 13.14(13))
if Present (Desig_Typ) then
Freeze_Before (P, Desig_Typ);
end if;
- -- Freeze type of expression (RM 13.14(9)). Note that we took care of
+ -- Freeze type of expression (RM 13.14(10)). Note that we took care of
-- the enumeration representation clause exception in the loop above.
if Present (Typ) then
Freeze_Before (P, Typ);
end if;
- -- Freeze name if one is present (RM 13.14(10))
+ -- Freeze name if one is present (RM 13.14(11))
if Present (Nam) then
Freeze_Before (P, Nam);
-- Freeze_Fixed_Point_Type --
-----------------------------
- -- Certain fixed-point types and subtypes, including implicit base
- -- types and declared first subtypes, have not yet set up a range.
- -- This is because the range cannot be set until the Small and Size
- -- values are known, and these are not known till the type is frozen.
+ -- Certain fixed-point types and subtypes, including implicit base types
+ -- and declared first subtypes, have not yet set up a range. This is
+ -- because the range cannot be set until the Small and Size values are
+ -- known, and these are not known till the type is frozen.
- -- To signal this case, Scalar_Range contains an unanalyzed syntactic
- -- range whose bounds are unanalyzed real literals. This routine will
- -- recognize this case, and transform this range node into a properly
- -- typed range with properly analyzed and resolved values.
+ -- To signal this case, Scalar_Range contains an unanalyzed syntactic range
+ -- whose bounds are unanalyzed real literals. This routine will recognize
+ -- this case, and transform this range node into a properly typed range
+ -- with properly analyzed and resolved values.
procedure Freeze_Fixed_Point_Type (Typ : Entity_Id) is
Rng : constant Node_Id := Scalar_Range (Typ);
-- Returns size of type with given bounds. Also leaves these
-- bounds set as the current bounds of the Typ.
+ -----------
+ -- Fsize --
+ -----------
+
function Fsize (Lov, Hiv : Ureal) return Nat is
begin
Set_Realval (Lo, Lov);
return Minimum_Size (Typ);
end Fsize;
- -- Start of processing for Freeze_Fixed_Point_Type;
+ -- Start of processing for Freeze_Fixed_Point_Type
begin
-- If Esize of a subtype has not previously been set, set it now
Atype := Ancestor_Subtype (Typ);
if Present (Atype) then
- Set_Size_Info (Typ, Atype);
+ Set_Esize (Typ, Esize (Atype));
else
- Set_Size_Info (Typ, Base_Type (Typ));
+ Set_Esize (Typ, Esize (Base_Type (Typ)));
end if;
end if;
- -- Immediate return if the range is already analyzed. This means
- -- that the range is already set, and does not need to be computed
- -- by this routine.
+ -- Immediate return if the range is already analyzed. This means that
+ -- the range is already set, and does not need to be computed by this
+ -- routine.
if Analyzed (Rng) then
return;
if Is_Ordinary_Fixed_Point_Type (Typ) then
-- For the ordinary fixed-point case, we are allowed to fudge the
- -- end-points up or down by small. Generally we prefer to fudge
- -- up, i.e. widen the bounds for non-model numbers so that the
- -- end points are included. However there are cases in which this
- -- cannot be done, and indeed cases in which we may need to narrow
- -- the bounds. The following circuit makes the decision.
+ -- end-points up or down by small. Generally we prefer to fudge up,
+ -- i.e. widen the bounds for non-model numbers so that the end points
+ -- are included. However there are cases in which this cannot be
+ -- done, and indeed cases in which we may need to narrow the bounds.
+ -- The following circuit makes the decision.
- -- Note: our terminology here is that Incl_EP means that the
- -- bounds are widened by Small if necessary to include the end
- -- points, and Excl_EP means that the bounds are narrowed by
- -- Small to exclude the end-points if this reduces the size.
+ -- Note: our terminology here is that Incl_EP means that the bounds
+ -- are widened by Small if necessary to include the end points, and
+ -- Excl_EP means that the bounds are narrowed by Small to exclude the
+ -- end-points if this reduces the size.
-- Note that in the Incl case, all we care about is including the
-- end-points. In the Excl case, we want to narrow the bounds as
end if;
-- Compute the fudged bounds. If the number is a model number,
- -- then we do nothing to include it, but we are allowed to
- -- backoff to the next adjacent model number when we exclude
- -- it. If it is not a model number then we straddle the two
- -- values with the model numbers on either side.
+ -- then we do nothing to include it, but we are allowed to backoff
+ -- to the next adjacent model number when we exclude it. If it is
+ -- not a model number then we straddle the two values with the
+ -- model numbers on either side.
Model_Num := UR_Trunc (Loval / Small) * Small;
Hival_Excl_EP := Hival_Incl_EP;
end if;
- -- One further adjustment is needed. In the case of subtypes,
- -- we cannot go outside the range of the base type, or we get
+ -- One further adjustment is needed. In the case of subtypes, we
+ -- cannot go outside the range of the base type, or we get
-- peculiarities, and the base type range is already set. This
- -- only applies to the Incl values, since clearly the Excl
- -- values are already as restricted as they are allowed to be.
+ -- only applies to the Incl values, since clearly the Excl values
+ -- are already as restricted as they are allowed to be.
if Typ /= Btyp then
Loval_Incl_EP := UR_Max (Loval_Incl_EP, Realval (BLo));
Actual_Hi := Hival_Incl_EP;
end if;
- -- One pathological case: normally we never fudge a low
- -- bound down, since it would seem to increase the size
- -- (if it has any effect), but for ranges containing a
- -- single value, or no values, the high bound can be
- -- small too large. Consider:
+ -- One pathological case: normally we never fudge a low bound
+ -- down, since it would seem to increase the size (if it has
+ -- any effect), but for ranges containing single value, or no
+ -- values, the high bound can be small too large. Consider:
-- type t is delta 2.0**(-14)
-- range 131072.0 .. 0;
- -- That lower bound is *just* outside the range of 32
- -- bits, and does need fudging down in this case. Note
- -- that the bounds will always have crossed here, since
- -- the high bound will be fudged down if necessary, as
- -- in the case of:
+ -- That lower bound is *just* outside the range of 32 bits, and
+ -- does need fudging down in this case. Note that the bounds
+ -- will always have crossed here, since the high bound will be
+ -- fudged down if necessary, as in the case of:
-- type t is delta 2.0**(-14)
-- range 131072.0 .. 131072.0;
- -- So we can detect the situation by looking for crossed
- -- bounds, and if the bounds are crossed, and the low
- -- bound is greater than zero, we will always back it
- -- off by small, since this is completely harmless.
+ -- So we detect the situation by looking for crossed bounds,
+ -- and if the bounds are crossed, and the low bound is greater
+ -- than zero, we will always back it off by small, since this
+ -- is completely harmless.
if Actual_Lo > Actual_Hi then
if UR_Is_Positive (Actual_Lo) then
Adjust_Esize_For_Alignment (Typ);
end if;
- -- If we have a base type, then expand the bounds so that they
- -- extend to the full width of the allocated size in bits, to
- -- avoid junk range checks on intermediate computations.
+ -- If we have a base type, then expand the bounds so that they extend to
+ -- the full width of the allocated size in bits, to avoid junk range
+ -- checks on intermediate computations.
if Base_Type (Typ) = Typ then
Set_Realval (Lo, -(Small * (Uint_2 ** (Actual_Size - 1))));
Set_Analyzed (Lo, False);
Analyze (Lo);
- -- Resolve with universal fixed if the base type, and the base
- -- type if it is a subtype. Note we can't resolve the base type
- -- with itself, that would be a reference before definition.
+ -- Resolve with universal fixed if the base type, and the base type if
+ -- it is a subtype. Note we can't resolve the base type with itself,
+ -- that would be a reference before definition.
if Typ = Btyp then
Resolve (Lo, Universal_Fixed);
Set_Etype (Rng, Etype (Lo));
- -- Set Esize to calculated size and also set RM_Size
+ -- Set Esize to calculated size if not set already
- Init_Esize (Typ, Actual_Size);
+ if Unknown_Esize (Typ) then
+ Init_Esize (Typ, Actual_Size);
+ end if;
-- Set RM_Size if not already set. If already set, check value
Set_RM_Size (Typ, Minsiz);
end if;
end;
-
end Freeze_Fixed_Point_Type;
------------------
-- static. This happens if the type depends on non-global objects.
procedure Ensure_Expression_Is_SA (N : Node_Id);
- -- Called to ensure that an expression used as part of a type
- -- definition is statically allocatable, which means that the type
- -- of the expression is statically allocatable, and the expression
- -- is either static, or a reference to a library level constant.
+ -- Called to ensure that an expression used as part of a type definition
+ -- is statically allocatable, which means that the expression type is
+ -- statically allocatable, and the expression is either static, or a
+ -- reference to a library level constant.
procedure Ensure_Type_Is_SA (Typ : Entity_Id);
-- Called to mark a type as static, checking that it is possible
return;
end if;
- -- We are also OK if the type is already marked as statically
- -- allocated, which means we processed it before.
+ -- We are also OK if the type already marked as statically allocated,
+ -- which means we processed it before.
if Is_Statically_Allocated (Typ) then
return;
elsif Is_Record_Type (Typ) then
C := First_Entity (Typ);
-
while Present (C) loop
if Ekind (C) = E_Discriminant
or else Ekind (C) = E_Component
begin
Ensure_Type_Is_SA (Etype (E));
+ -- Reset True_Constant flag, since something strange is going on with
+ -- the scoping here, and our simple value tracing may not be sufficient
+ -- for this indication to be reliable. We kill the Constant_Value
+ -- and Last_Assignment indications for the same reason.
+
+ Set_Is_True_Constant (E, False);
+ Set_Current_Value (E, Empty);
+
+ if Ekind (E) = E_Variable then
+ Set_Last_Assignment (E, Empty);
+ end if;
+
exception
when Cannot_Be_Static =>
end if;
end if;
+ -- Reset the Pure indication on an imported subprogram unless an
+ -- explicit Pure_Function pragma was present. We do this because
+ -- otherwise it is an insidious error to call a non-pure function from
+ -- pure unit and have calls mysteriously optimized away. What happens
+ -- here is that the Import can bypass the normal check to ensure that
+ -- pure units call only pure subprograms.
+
+ if Is_Imported (E)
+ and then Is_Pure (E)
+ and then not Has_Pragma_Pure_Function (E)
+ then
+ Set_Is_Pure (E, False);
+ end if;
+
-- For non-foreign convention subprograms, this is where we create
-- the extra formals (for accessibility level and constrained bit
-- information). We delay this till the freeze point precisely so
if Ekind (E) = E_Procedure
and then Is_Valued_Procedure (E)
and then Convention (E) = Convention_Ada
+ and then Warn_On_Export_Import
then
Error_Msg_N
("?Valued_Procedure has no effect for convention Ada", E);
else
Set_Mechanisms (E);
- -- For foreign conventions, do not permit return of an
+ -- For foreign conventions, warn about return of an
-- unconstrained array.
-- Note: we *do* allow a return by descriptor for the VMS case,
null;
-- If the return type is generic, we have emitted a warning
- -- earlier on, and there is nothing else to check here.
- -- Specific instantiations may lead to erroneous behavior.
+ -- earlier on, and there is nothing else to check here. Specific
+ -- instantiations may lead to erroneous behavior.
elsif Is_Generic_Type (Etype (E)) then
null;
elsif Is_Array_Type (Retype)
and then not Is_Constrained (Retype)
and then Mechanism (E) not in Descriptor_Codes
+ and then Warn_On_Export_Import
then
- Error_Msg_NE
- ("convention for& does not permit returning " &
- "unconstrained array type", E, E);
+ Error_Msg_N
+ ("?foreign convention function& should not return " &
+ "unconstrained array", E);
return;
end if;
end if;
-- If any of the formals for an exported foreign convention
- -- subprogram have defaults, then emit an appropriate warning
- -- since this is odd (default cannot be used from non-Ada code)
+ -- subprogram have defaults, then emit an appropriate warning since
+ -- this is odd (default cannot be used from non-Ada code)
if Is_Exported (E) then
F := First_Formal (E);
while Present (F) loop
- if Present (Default_Value (F)) then
+ if Warn_On_Export_Import
+ and then Present (Default_Value (F))
+ then
Error_Msg_N
("?parameter cannot be defaulted in non-Ada call",
Default_Value (F));
end if;
end if;
- end Freeze_Subprogram;
+ -- Pragma Inline_Always is disallowed for dispatching subprograms
+ -- because the address of such subprograms is saved in the dispatch
+ -- table to support dispatching calls, and dispatching calls cannot
+ -- be inlined. This is consistent with the restriction against using
+ -- 'Access or 'Address on an Inline_Always subprogram.
- -----------------------
- -- Is_Fully_Defined --
- -----------------------
+ if Is_Dispatching_Operation (E) and then Is_Always_Inlined (E) then
+ Error_Msg_N
+ ("pragma Inline_Always not allowed for dispatching subprograms", E);
+ end if;
+ end Freeze_Subprogram;
- -- Should this be in Sem_Util ???
+ ----------------------
+ -- Is_Fully_Defined --
+ ----------------------
function Is_Fully_Defined (T : Entity_Id) return Boolean is
begin
if Ekind (T) = E_Class_Wide_Type then
return Is_Fully_Defined (Etype (T));
- else
- return not Is_Private_Type (T)
- or else Present (Full_View (Base_Type (T)));
+
+ elsif Is_Array_Type (T) then
+ return Is_Fully_Defined (Component_Type (T));
+
+ elsif Is_Record_Type (T)
+ and not Is_Private_Type (T)
+ then
+ -- Verify that the record type has no components with private types
+ -- without completion.
+
+ declare
+ Comp : Entity_Id;
+
+ begin
+ Comp := First_Component (T);
+
+ while Present (Comp) loop
+ if not Is_Fully_Defined (Etype (Comp)) then
+ return False;
+ end if;
+
+ Next_Component (Comp);
+ end loop;
+ return True;
+ end;
+
+ else return not Is_Private_Type (T)
+ or else Present (Full_View (Base_Type (T)));
end if;
end Is_Fully_Defined;
begin
Set_Default_Expressions_Processed (E);
- -- A subprogram instance and its associated anonymous subprogram
- -- share their signature. The default expression functions are defined
- -- in the wrapper packages for the anonymous subprogram, and should
- -- not be generated again for the instance.
+ -- A subprogram instance and its associated anonymous subprogram share
+ -- their signature. The default expression functions are defined in the
+ -- wrapper packages for the anonymous subprogram, and should not be
+ -- generated again for the instance.
if Is_Generic_Instance (E)
and then Present (Alias (E))
or else (Nkind (Dcopy) = N_Attribute_Reference
and then
Attribute_Name (Dcopy) = Name_Null_Parameter)
-
then
-- If there is no default function, we must still do a full
- -- analyze call on the default value, to ensure that all
- -- error checks are performed, e.g. those associated with
- -- static evaluation. Note that this branch will always be
- -- taken if the analyzer is turned off (but we still need the
- -- error checks).
+ -- analyze call on the default value, to ensure that all error
+ -- checks are performed, e.g. those associated with static
+ -- evaluation. Note: this branch will always be taken if the
+ -- analyzer is turned off (but we still need the error checks).
-- Note: the setting of parent here is to meet the requirement
-- that we can only analyze the expression while attached to
-- context is generic, to avoid anomalies with private types.
if Ekind (Scope (E)) = E_Generic_Package then
- Resolve (Dcopy, Etype (Dcopy));
+ Resolve (Dcopy);
else
Resolve (Dcopy, Etype (Formal));
end if;
Set_Debug_Info_Needed (Corresponding_Record_Type (T));
end if;
end if;
-
end Set_Debug_Info_Needed;
+ ------------------
+ -- Undelay_Type --
+ ------------------
+
+ procedure Undelay_Type (T : Entity_Id) is
+ begin
+ Set_Has_Delayed_Freeze (T, False);
+ Set_Freeze_Node (T, Empty);
+
+ -- Since we don't want T to have a Freeze_Node, we don't want its
+ -- Full_View or Corresponding_Record_Type to have one either.
+
+ -- ??? Fundamentally, this whole handling is a kludge. What we really
+ -- want is to be sure that for an Itype that's part of record R and is a
+ -- subtype of type T, that it's frozen after the later of the freeze
+ -- points of R and T. We have no way of doing that directly, so what we
+ -- do is force most such Itypes to be frozen as part of freezing R via
+ -- this procedure and only delay the ones that need to be delayed
+ -- (mostly the designated types of access types that are defined as part
+ -- of the record).
+
+ if Is_Private_Type (T)
+ and then Present (Full_View (T))
+ and then Is_Itype (Full_View (T))
+ and then Is_Record_Type (Scope (Full_View (T)))
+ then
+ Undelay_Type (Full_View (T));
+ end if;
+
+ if Is_Concurrent_Type (T)
+ and then Present (Corresponding_Record_Type (T))
+ and then Is_Itype (Corresponding_Record_Type (T))
+ and then Is_Record_Type (Scope (Corresponding_Record_Type (T)))
+ then
+ Undelay_Type (Corresponding_Record_Type (T));
+ end if;
+ end Undelay_Type;
+
+ ------------------
+ -- Warn_Overlay --
+ ------------------
+
+ procedure Warn_Overlay
+ (Expr : Node_Id;
+ Typ : Entity_Id;
+ Nam : Entity_Id)
+ is
+ Ent : constant Entity_Id := Entity (Nam);
+ -- The object to which the address clause applies
+
+ Init : Node_Id;
+ Old : Entity_Id := Empty;
+ Decl : Node_Id;
+
+ begin
+ -- No warning if address clause overlay warnings are off
+
+ if not Address_Clause_Overlay_Warnings then
+ return;
+ end if;
+
+ -- No warning if there is an explicit initialization
+
+ Init := Original_Node (Expression (Declaration_Node (Ent)));
+
+ if Present (Init) and then Comes_From_Source (Init) then
+ return;
+ end if;
+
+ -- We only give the warning for non-imported entities of a type for
+ -- which a non-null base init proc is defined (or for access types which
+ -- have implicit null initialization).
+
+ if Present (Expr)
+ and then (Has_Non_Null_Base_Init_Proc (Typ)
+ or else Is_Access_Type (Typ))
+ and then not Is_Imported (Ent)
+ then
+ if Nkind (Expr) = N_Attribute_Reference
+ and then Is_Entity_Name (Prefix (Expr))
+ then
+ Old := Entity (Prefix (Expr));
+
+ elsif Is_Entity_Name (Expr)
+ and then Ekind (Entity (Expr)) = E_Constant
+ then
+ Decl := Declaration_Node (Entity (Expr));
+
+ if Nkind (Decl) = N_Object_Declaration
+ and then Present (Expression (Decl))
+ and then Nkind (Expression (Decl)) = N_Attribute_Reference
+ and then Is_Entity_Name (Prefix (Expression (Decl)))
+ then
+ Old := Entity (Prefix (Expression (Decl)));
+
+ elsif Nkind (Expr) = N_Function_Call then
+ return;
+ end if;
+
+ -- A function call (most likely to To_Address) is probably not an
+ -- overlay, so skip warning. Ditto if the function call was inlined
+ -- and transformed into an entity.
+
+ elsif Nkind (Original_Node (Expr)) = N_Function_Call then
+ return;
+ end if;
+
+ Decl := Next (Parent (Expr));
+
+ -- If a pragma Import follows, we assume that it is for the current
+ -- target of the address clause, and skip the warning.
+
+ if Present (Decl)
+ and then Nkind (Decl) = N_Pragma
+ and then Chars (Decl) = Name_Import
+ then
+ return;
+ end if;
+
+ if Present (Old) then
+ Error_Msg_Node_2 := Old;
+ Error_Msg_N
+ ("default initialization of & may modify &?",
+ Nam);
+ else
+ Error_Msg_N
+ ("default initialization of & may modify overlaid storage?",
+ Nam);
+ end if;
+
+ -- Add friendly warning if initialization comes from a packed array
+ -- component.
+
+ if Is_Record_Type (Typ) then
+ declare
+ Comp : Entity_Id;
+
+ begin
+ Comp := First_Component (Typ);
+
+ while Present (Comp) loop
+ if Nkind (Parent (Comp)) = N_Component_Declaration
+ and then Present (Expression (Parent (Comp)))
+ then
+ exit;
+ elsif Is_Array_Type (Etype (Comp))
+ and then Present (Packed_Array_Type (Etype (Comp)))
+ then
+ Error_Msg_NE
+ ("\packed array component& " &
+ "will be initialized to zero?",
+ Nam, Comp);
+ exit;
+ else
+ Next_Component (Comp);
+ end if;
+ end loop;
+ end;
+ end if;
+
+ Error_Msg_N
+ ("\use pragma Import for & to " &
+ "suppress initialization ('R'M B.1(24))?",
+ Nam);
+ end if;
+ end Warn_Overlay;
+
end Freeze;
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