of the *-gnatX* command switch).
In extension mode, the latest version of the Ada language is
-implemented (currently Ada 2012), and in addition a small number
+implemented (currently Ada 202x), and in addition a small number
of GNAT specific extensions are recognized as follows:
+* Constrained attribute for generic objects
-
-*Constrained attribute for generic objects*
The ``Constrained`` attribute is permitted for objects of
generic types. The result indicates if the corresponding actual
is constrained.
+* ``Static`` aspect on intrinsic functions
+
+ The Ada 202x ``Static`` aspect can be specified on Intrinsic imported
+ functions and the compiler will evaluate some of these intrinsic statically,
+ in particular the ``Shift_Left`` and ``Shift_Right`` intrinsics.
+
+* ``'Reduce`` attribute
+
+ This attribute part of the Ada 202x language definition is provided for
+ now under -gnatX to confirm and potentially refine its usage and syntax.
+
+* ``[]`` aggregates
+
+ This new aggregate syntax for arrays and containers is provided under -gnatX
+ to experiment and confirm this new language syntax.
+
+
.. _Pragma-Extensions_Visible:
Pragma Extensions_Visible
of the @emph{-gnatX} command switch).
In extension mode, the latest version of the Ada language is
-implemented (currently Ada 2012), and in addition a small number
+implemented (currently Ada 202x), and in addition a small number
of GNAT specific extensions are recognized as follows:
-@table @asis
+@itemize *
-@item @emph{Constrained attribute for generic objects}
+@item
+Constrained attribute for generic objects
The @code{Constrained} attribute is permitted for objects of
generic types. The result indicates if the corresponding actual
is constrained.
-@end table
+
+@item
+@code{Static} aspect on intrinsic functions
+
+The Ada 202x @code{Static} aspect can be specified on Intrinsic imported
+functions and the compiler will evaluate some of these intrinsic statically,
+in particular the @code{Shift_Left} and @code{Shift_Right} intrinsics.
+
+@item
+@code{'Reduce} attribute
+
+This attribute part of the Ada 202x language definition is provided for
+now under -gnatX to confirm and potentially refine its usage and syntax.
+
+@item
+@code{[]} aggregates
+
+This new aggregate syntax for arrays and containers is provided under -gnatX
+to experiment and confirm this new language syntax.
+@end itemize
@node Pragma Extensions_Visible,Pragma External,Pragma Extensions_Allowed,Implementation Defined Pragmas
@anchor{gnat_rm/implementation_defined_pragmas id12}@anchor{66}@anchor{gnat_rm/implementation_defined_pragmas pragma-extensions-visible}@anchor{67}
Backend_Not_Inlined_Subps := No_Elist;
end Initialize;
- --------------------------------------------
- -- Inline_Static_Expression_Function_Call --
- --------------------------------------------
+ ---------------------------------
+ -- Inline_Static_Function_Call --
+ ---------------------------------
- procedure Inline_Static_Expression_Function_Call
- (N : Node_Id; Subp : Entity_Id)
- is
+ procedure Inline_Static_Function_Call (N : Node_Id; Subp : Entity_Id) is
function Replace_Formal (N : Node_Id) return Traverse_Result;
-- Replace each occurrence of a formal with the corresponding actual,
procedure Reset_Slocs is new Traverse_Proc (Reset_Sloc);
- -- Start of processing for Inline_Static_Expression_Function_Call
+ -- Start of processing for Inline_Static_Function_Call
begin
- pragma Assert (Is_Static_Expression_Function_Call (N));
+ pragma Assert (Is_Static_Function_Call (N));
declare
Decls : constant List_Id := New_List;
Reset_Actual_Mapping_For_Inlined_Call (Subp);
end;
- end Inline_Static_Expression_Function_Call;
+ end Inline_Static_Function_Call;
------------------------
-- Instantiate_Bodies --
-- Check a list of statements, Stats, that make inlining of Subp not
-- worthwhile, including any tasking statement, nested at any level.
- procedure Inline_Static_Expression_Function_Call
+ procedure Inline_Static_Function_Call
(N : Node_Id; Subp : Entity_Id);
- -- Evaluate static call to a static expression function Subp, substituting
- -- actuals in place of references to their corresponding formals and
- -- rewriting the call N as a fully folded and static result expression.
+ -- Evaluate static call to a static function Subp, substituting actuals in
+ -- place of references to their corresponding formals and rewriting the
+ -- call N as a fully folded and static result expression.
procedure List_Inlining_Info;
-- Generate listing of calls inlined by the frontend plus listing of
Extensions_Allowed : Boolean := False;
-- GNAT
-- Set to True by switch -gnatX if GNAT specific language extensions
- -- are allowed. Currently there are no such defined extensions.
+ -- are allowed. See GNAT RM for details.
type External_Casing_Type is (
As_Is, -- External names cased as they appear in the Ada source
if Chars (Expression (Arg1)) = Name_On then
Extensions_Allowed := True;
- Ada_Version := Ada_2012;
+ Ada_Version := Ada_Version_Type'Last;
else
Extensions_Allowed := False;
Ada_Version := Ada_Version_Explicit;
return;
-- Also allow an object of a generic type if extensions allowed
- -- and allow this for any type at all. (this may be obsolete ???)
+ -- and allow this for any type at all.
elsif (Is_Generic_Type (P_Type)
or else Is_Generic_Actual_Type (P_Type))
---------------------------
procedure Analyze_Aspect_Static is
+ function Has_Convention_Intrinsic (L : List_Id) return Boolean;
+ -- Return True if L contains a pragma argument association
+ -- node representing a convention Intrinsic.
+
+ ------------------------------
+ -- Has_Convention_Intrinsic --
+ ------------------------------
+
+ function Has_Convention_Intrinsic
+ (L : List_Id) return Boolean
+ is
+ Arg : Node_Id := First (L);
+ begin
+ while Present (Arg) loop
+ if Nkind (Arg) = N_Pragma_Argument_Association
+ and then Chars (Arg) = Name_Convention
+ and then Chars (Expression (Arg)) = Name_Intrinsic
+ then
+ return True;
+ end if;
+
+ Next (Arg);
+ end loop;
+
+ return False;
+ end Has_Convention_Intrinsic;
+
+ Is_Imported_Intrinsic : Boolean;
+
begin
if Ada_Version < Ada_2020 then
Error_Msg_N
Error_Msg_N ("\compile with -gnat2020", Aspect);
return;
+ end if;
+
+ Is_Imported_Intrinsic := Is_Imported (E)
+ and then
+ Has_Convention_Intrinsic
+ (Pragma_Argument_Associations (Import_Pragma (E)));
-- The aspect applies only to expression functions that
-- statisfy the requirements for a static expression function
- -- (such as having an expression that is predicate-static).
+ -- (such as having an expression that is predicate-static) as
+ -- well as Intrinsic imported functions as a -gnatX extension.
- elsif not Is_Expression_Function (E) then
- Error_Msg_N
- ("aspect % requires expression function", Aspect);
+ if not Is_Expression_Function (E)
+ and then
+ not (Extensions_Allowed and then Is_Imported_Intrinsic)
+ then
+ if Extensions_Allowed then
+ Error_Msg_N
+ ("aspect % requires intrinsic or expression function",
+ Aspect);
+
+ elsif Is_Imported_Intrinsic then
+ Error_Msg_N
+ ("aspect % on intrinsic function is an extension: " &
+ "use -gnatX",
+ Aspect);
+
+ else
+ Error_Msg_N
+ ("aspect % requires expression function", Aspect);
+ end if;
return;
-- Ada 202x (AI12-0075): Check that the function satisfies
- -- several requirements of static expression functions as
- -- specified in RM 6.8(5.1-5.8). Note that some of the
- -- requirements given there are checked elsewhere.
+ -- several requirements of static functions as specified in
+ -- RM 6.8(5.1-5.8). Note that some of the requirements given
+ -- there are checked elsewhere.
else
-- The expression of the expression function must be a
-- requirements of the Ada 202x RM in 4.9(3.2/5-3.4/5) and
-- we flag an error.
- if Is_Static_Expression_Function (Def_Id) then
+ if Is_Static_Function (Def_Id) then
if not Is_Static_Expression (Expr) then
declare
Exp_Copy : constant Node_Id := New_Copy_Tree (Expr);
-- Static expression functions require no ABE processing
- elsif Is_Static_Expression_Function (Subp_Id) then
+ elsif Is_Static_Function (Subp_Id) then
return;
-- Source calls to source targets are always considered because they
with Sem_Cat; use Sem_Cat;
with Sem_Ch6; use Sem_Ch6;
with Sem_Ch8; use Sem_Ch8;
+with Sem_Elab; use Sem_Elab;
with Sem_Res; use Sem_Res;
with Sem_Util; use Sem_Util;
with Sem_Type; use Sem_Type;
-- discrete, real, or string type and must be a compile-time-known value
-- (it is an error to make the call if these conditions are not met).
+ procedure Eval_Intrinsic_Call (N : Node_Id; E : Entity_Id);
+ -- Evaluate a call N to an intrinsic subprogram E.
+
function Find_Universal_Operator_Type (N : Node_Id) return Entity_Id;
-- Check whether an arithmetic operation with universal operands which is a
-- rewritten function call with an explicit scope indication is ambiguous:
-- (e.g. in the expression of a type conversion). If ambiguous, emit an
-- error and return Empty, else return the result type of the operator.
+ procedure Fold_Dummy (N : Node_Id; Typ : Entity_Id);
+ -- Rewrite N as a constant dummy value in the relevant type if possible.
+
+ procedure Fold_Shift
+ (N : Node_Id;
+ Left : Node_Id;
+ Right : Node_Id;
+ Op : Node_Kind;
+ Static : Boolean := False;
+ Check_Elab : Boolean := False);
+ -- Rewrite N as the result of evaluating Left <shift op> Right if possible.
+ -- Op represents the shift operation.
+ -- Static indicates whether the resulting node should be marked static.
+ -- Check_Elab indicates whether checks for elaboration calls should be
+ -- inserted when relevant.
+
function From_Bits (B : Bits; T : Entity_Id) return Uint;
-- Converts a bit string of length B'Length to a Uint value to be used for
-- a target of type T, which is a modular type. This procedure includes the
-- Only the latter case is handled here, predefined operators are
-- constant-folded elsewhere.
- -- If the function is itself inherited (see 7423-001) the literal of
- -- the parent type must be explicitly converted to the return type
- -- of the function.
+ -- If the function is itself inherited the literal of the parent type must
+ -- be explicitly converted to the return type of the function.
procedure Eval_Call (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Resolve (N, Typ);
end if;
+ elsif Nkind (N) = N_Function_Call
+ and then Is_Entity_Name (Name (N))
+ and then Is_Intrinsic_Subprogram (Entity (Name (N)))
+ then
+ Eval_Intrinsic_Call (N, Entity (Name (N)));
+
-- Ada 202x (AI12-0075): If checking for potentially static expressions
- -- is enabled and we have a call to a static expression function,
- -- substitute a static value for the call, to allow folding the
- -- expression. This supports checking the requirement of RM 6.8(5.3/5)
- -- in Analyze_Expression_Function.
+ -- is enabled and we have a call to a static function, substitute a
+ -- static value for the call, to allow folding the expression. This
+ -- supports checking the requirement of RM 6.8(5.3/5) in
+ -- Analyze_Expression_Function.
elsif Checking_Potentially_Static_Expression
- and then Is_Static_Expression_Function_Call (N)
+ and then Is_Static_Function_Call (N)
then
- if Is_Integer_Type (Typ) then
- Fold_Uint (N, Uint_1, Static => True);
- return;
-
- elsif Is_Real_Type (Typ) then
- Fold_Ureal (N, Ureal_1, Static => True);
- return;
-
- elsif Is_Enumeration_Type (Typ) then
- Fold_Uint
- (N,
- Expr_Value (Type_Low_Bound (Base_Type (Typ))),
- Static => True);
- return;
-
- elsif Is_String_Type (Typ) then
- Fold_Str
- (N,
- Strval (Make_String_Literal (Sloc (N), "")),
- Static => True);
- return;
- end if;
+ Fold_Dummy (N, Typ);
end if;
end Eval_Call;
elsif Ekind (Def_Id) = E_In_Parameter
and then Checking_Potentially_Static_Expression
- and then Is_Static_Expression_Function (Scope (Def_Id))
+ and then Is_Static_Function (Scope (Def_Id))
then
- if Is_Integer_Type (Etype (Def_Id)) then
- Fold_Uint (N, Uint_1, Static => True);
- return;
-
- elsif Is_Real_Type (Etype (Def_Id)) then
- Fold_Ureal (N, Ureal_1, Static => True);
- return;
-
- elsif Is_Enumeration_Type (Etype (Def_Id)) then
- Fold_Uint
- (N,
- Expr_Value (Type_Low_Bound (Base_Type (Etype (Def_Id)))),
- Static => True);
- return;
-
- elsif Is_String_Type (Etype (Def_Id)) then
- Fold_Str
- (N,
- Strval (Make_String_Literal (Sloc (N), "")),
- Static => True);
- return;
- end if;
+ Fold_Dummy (N, Etype (Def_Id));
end if;
-- Fall through if the name is not static
end if;
end Eval_Integer_Literal;
+ -------------------------
+ -- Eval_Intrinsic_Call --
+ -------------------------
+
+ procedure Eval_Intrinsic_Call (N : Node_Id; E : Entity_Id) is
+
+ procedure Eval_Shift (N : Node_Id; E : Entity_Id; Op : Node_Kind);
+ -- Evaluate an intrinsic shift call N on the given subprogram E.
+ -- Op is the kind for the shift node.
+
+ ----------------
+ -- Eval_Shift --
+ ----------------
+
+ procedure Eval_Shift (N : Node_Id; E : Entity_Id; Op : Node_Kind) is
+ Left : constant Node_Id := First_Actual (N);
+ Right : constant Node_Id := Next_Actual (Left);
+ Static : constant Boolean := Is_Static_Function (E);
+
+ begin
+ if Static then
+ if Checking_Potentially_Static_Expression then
+ Fold_Dummy (N, Etype (N));
+ return;
+ end if;
+ end if;
+
+ Fold_Shift
+ (N, Left, Right, Op, Static => Static, Check_Elab => not Static);
+ end Eval_Shift;
+
+ Nam : Name_Id;
+
+ begin
+ -- Nothing to do if the intrinsic is handled by the back end.
+
+ if Present (Interface_Name (E)) then
+ return;
+ end if;
+
+ -- Intrinsic calls as part of a static function is a language extension.
+
+ if Checking_Potentially_Static_Expression
+ and then not Extensions_Allowed
+ then
+ return;
+ end if;
+
+ -- If we have a renaming, expand the call to the original operation,
+ -- which must itself be intrinsic, since renaming requires matching
+ -- conventions and this has already been checked.
+
+ if Present (Alias (E)) then
+ Eval_Intrinsic_Call (N, Alias (E));
+ return;
+ end if;
+
+ -- If the intrinsic subprogram is generic, gets its original name
+
+ if Present (Parent (E))
+ and then Present (Generic_Parent (Parent (E)))
+ then
+ Nam := Chars (Generic_Parent (Parent (E)));
+ else
+ Nam := Chars (E);
+ end if;
+
+ case Nam is
+ when Name_Shift_Left => Eval_Shift (N, E, N_Op_Shift_Left);
+ when Name_Shift_Right => Eval_Shift (N, E, N_Op_Shift_Right);
+ when others => null;
+ end case;
+ end Eval_Intrinsic_Call;
+
---------------------
-- Eval_Logical_Op --
---------------------
To_Bits (Right_Int, Right_Bits);
-- Note: should really be able to use array ops instead of
- -- these loops, but they weren't working at the time ???
+ -- these loops, but they break the build with a cryptic error
+ -- during the bind of gnat1 likely due to a wrong computation
+ -- of a date or checksum.
if Nkind (N) = N_Op_And then
for J in Left_Bits'Range loop
-- Eval_Shift --
----------------
- -- Shift operations are intrinsic operations that can never be static, so
- -- the only processing required is to perform the required check for a non
- -- static context for the two operands.
-
- -- Actually we could do some compile time evaluation here some time ???
-
procedure Eval_Shift (N : Node_Id) is
begin
- Check_Non_Static_Context (Left_Opnd (N));
- Check_Non_Static_Context (Right_Opnd (N));
+ -- This procedure is only called for compiler generated code (e.g.
+ -- packed arrays), so there is nothing to do except attempting to fold
+ -- the expression.
+
+ Fold_Shift (N, Left_Opnd (N), Right_Opnd (N), Nkind (N));
end Eval_Shift;
------------------------
end if;
end Flag_Non_Static_Expr;
+ ----------------
+ -- Fold_Dummy --
+ ----------------
+
+ procedure Fold_Dummy (N : Node_Id; Typ : Entity_Id) is
+ begin
+ if Is_Integer_Type (Typ) then
+ Fold_Uint (N, Uint_1, Static => True);
+
+ elsif Is_Real_Type (Typ) then
+ Fold_Ureal (N, Ureal_1, Static => True);
+
+ elsif Is_Enumeration_Type (Typ) then
+ Fold_Uint
+ (N,
+ Expr_Value (Type_Low_Bound (Base_Type (Typ))),
+ Static => True);
+
+ elsif Is_String_Type (Typ) then
+ Fold_Str
+ (N,
+ Strval (Make_String_Literal (Sloc (N), "")),
+ Static => True);
+ end if;
+ end Fold_Dummy;
+
+ ----------------
+ -- Fold_Shift --
+ ----------------
+
+ procedure Fold_Shift
+ (N : Node_Id;
+ Left : Node_Id;
+ Right : Node_Id;
+ Op : Node_Kind;
+ Static : Boolean := False;
+ Check_Elab : Boolean := False)
+ is
+ Typ : constant Entity_Id := Etype (Left);
+
+ procedure Check_Elab_Call;
+ -- Add checks related to calls in elaboration code
+
+ ---------------------
+ -- Check_Elab_Call --
+ ---------------------
+
+ procedure Check_Elab_Call is
+ begin
+ if Check_Elab then
+ if Legacy_Elaboration_Checks then
+ Check_Elab_Call (N);
+ end if;
+
+ Build_Call_Marker (N);
+ end if;
+ end Check_Elab_Call;
+
+ begin
+ -- Evaluate logical shift operators on binary modular types
+
+ if Is_Modular_Integer_Type (Typ)
+ and then not Non_Binary_Modulus (Typ)
+ and then Compile_Time_Known_Value (Left)
+ and then Compile_Time_Known_Value (Right)
+ then
+ if Op = N_Op_Shift_Left then
+ Check_Elab_Call;
+
+ -- Fold Shift_Left (X, Y) by computing (X * 2**Y) rem modulus
+
+ Fold_Uint
+ (N,
+ (Expr_Value (Left) * (Uint_2 ** Expr_Value (Right)))
+ rem Modulus (Typ),
+ Static => Static);
+
+ elsif Op = N_Op_Shift_Right then
+ Check_Elab_Call;
+
+ -- Fold Shift_Right (X, Y) by computing X / 2**Y
+
+ Fold_Uint
+ (N,
+ Expr_Value (Left) / (Uint_2 ** Expr_Value (Right)),
+ Static => Static);
+ end if;
+ end if;
+ end Fold_Shift;
+
--------------
-- Fold_Str --
--------------
Resolution_Failed;
return;
- -- Only one intepretation
+ -- Only one interpretation
else
-- In Ada 2005, if we have something like "X : T := 2 + 2;", where
if Same_Or_Aliased_Subprograms (Nam, Scop)
and then not Restriction_Active (No_Recursion)
- and then not Is_Static_Expression_Function (Scop)
+ and then not Is_Static_Function (Scop)
and then Check_Infinite_Recursion (N)
then
-- Here we detected and flagged an infinite recursion, so we do
Scope_Loop : while Scop /= Standard_Standard loop
if Same_Or_Aliased_Subprograms (Nam, Scop) then
- -- Ada 202x (AI12-0075): Static expression function are
- -- never allowed to make a recursive call, as specified
- -- by 6.8(5.4/5).
+ -- Ada 202x (AI12-0075): Static functions are never allowed
+ -- to make a recursive call, as specified by 6.8(5.4/5).
- if Is_Static_Expression_Function (Scop) then
+ if Is_Static_Function (Scop) then
Error_Msg_N
("recursive call not allowed in static expression "
& "function", N);
or else Is_Build_In_Place_Function (Nam)
or else Is_Intrinsic_Subprogram (Nam)
or else Is_Inlinable_Expression_Function (Nam)
- or else Is_Static_Expression_Function_Call (N)
+ or else Is_Static_Function_Call (N)
then
null;
-- when doing the inlining).
if not Checking_Potentially_Static_Expression
- and then Is_Static_Expression_Function_Call (N)
+ and then Is_Static_Function_Call (N)
and then not Error_Posted (Ultimate_Alias (Nam))
then
- Inline_Static_Expression_Function_Call (N, Ultimate_Alias (Nam));
+ Inline_Static_Function_Call (N, Ultimate_Alias (Nam));
-- In GNATprove mode, expansion is disabled, but we want to inline some
-- subprograms to facilitate formal verification. Indirect calls through
or else Nkind (N) = N_Procedure_Call_Statement;
end Is_Statement;
- ------------------------------------
- -- Is_Static_Expression_Function --
- ------------------------------------
+ ------------------------
+ -- Is_Static_Function --
+ ------------------------
- function Is_Static_Expression_Function (Subp : Entity_Id) return Boolean is
+ function Is_Static_Function (Subp : Entity_Id) return Boolean is
begin
- return Is_Expression_Function (Subp)
- and then Has_Aspect (Subp, Aspect_Static)
+ return Has_Aspect (Subp, Aspect_Static)
and then
(No (Find_Value_Of_Aspect (Subp, Aspect_Static))
or else Is_True (Static_Boolean
(Find_Value_Of_Aspect (Subp, Aspect_Static))));
- end Is_Static_Expression_Function;
-
- -----------------------------------------
- -- Is_Static_Expression_Function_Call --
- -----------------------------------------
+ end Is_Static_Function;
- function Is_Static_Expression_Function_Call (Call : Node_Id) return Boolean
- is
+ ------------------------------
+ -- Is_Static_Function_Call --
+ ------------------------------
+ function Is_Static_Function_Call (Call : Node_Id) return Boolean is
function Has_All_Static_Actuals (Call : Node_Id) return Boolean;
-- Return whether all actual parameters of Call are static expressions
+ ----------------------------
+ -- Has_All_Static_Actuals --
+ ----------------------------
+
function Has_All_Static_Actuals (Call : Node_Id) return Boolean is
Actual : Node_Id := First_Actual (Call);
String_Result : constant Boolean :=
-- ??? In the string-returning case we want to avoid a call
-- being made to Establish_Transient_Scope in Resolve_Call,
-- but at the point where that's tested for (which now includes
- -- a call to test Is_Static_Expression_Function_Call), the
- -- actuals of the call haven't been resolved, so expressions
- -- of the actuals may not have been marked Is_Static_Expression
- -- yet, so we force them to be resolved here, so we can tell if
- -- they're static. Calling Resolve here is admittedly a kludge,
- -- and we limit this call to string-returning cases. ???
+ -- a call to test Is_Static_Function_Call), the actuals of the
+ -- call haven't been resolved, so expressions of the actuals
+ -- may not have been marked Is_Static_Expression yet, so we
+ -- force them to be resolved here, so we can tell if they're
+ -- static. Calling Resolve here is admittedly a kludge, and we
+ -- limit this call to string-returning cases.
if String_Result then
Resolve (Actual);
begin
return Nkind (Call) = N_Function_Call
and then Is_Entity_Name (Name (Call))
- and then Is_Static_Expression_Function (Entity (Name (Call)))
+ and then Is_Static_Function (Entity (Name (Call)))
and then Has_All_Static_Actuals (Call);
- end Is_Static_Expression_Function_Call;
+ end Is_Static_Function_Call;
----------------------------------------
-- Is_Subcomponent_Of_Atomic_Object --
-- the N_Statement_Other_Than_Procedure_Call subtype from Sinfo).
-- Note that a label is *not* a statement, and will return False.
- function Is_Static_Expression_Function (Subp : Entity_Id) return Boolean;
- -- Determine whether subprogram Subp denotes a static expression function,
- -- which is an expression function with the aspect Static with value True.
+ function Is_Static_Function (Subp : Entity_Id) return Boolean;
+ -- Determine whether subprogram Subp denotes a static function,
+ -- which is a function with the aspect Static with value True.
- function Is_Static_Expression_Function_Call (Call : Node_Id) return Boolean;
- -- Determine whether Call is a static call to a static expression function,
- -- meaning that the name of the call denotes a static expression function
+ function Is_Static_Function_Call (Call : Node_Id) return Boolean;
+ -- Determine whether Call is a static call to a static function,
+ -- meaning that the name of the call denotes a static function
-- and all of the call's actual parameters are given by static expressions.
function Is_Subcomponent_Of_Atomic_Object (N : Node_Id) return Boolean;
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