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|
-- C460006.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
-- Check that a view conversion to a tagged type is permitted in the
-- prefix of a selected component, an object renaming declaration, and
-- (if the operand is a variable) on the left side of an assignment
-- statement. Check that such a renaming or assignment does not change
-- the tag of the operand.
--
-- Check that, for a view conversion of a tagged type, each
-- nondiscriminant component of the new view denotes the matching
-- component of the operand object. Check that reading the value of the
-- view yields the result of converting the value of the operand object
-- to the target subtype.
--
-- TEST DESCRIPTION:
-- The fact that the tag of an object is not changed is verified by
-- making calls to primitive operations which in turn make (re)dispatching
-- calls, and confirming that the proper bodies are executed.
--
-- Selected components are checked in three contexts: as the object name
-- in an object renaming declaration, as the left operand of an inequality
-- operation, and as the left side of an assignment statement.
--
-- View conversions of an object of a 2nd level type extension are
-- renamed as objects of an ancestor type and of a class-wide type. In
-- one case the operand of the conversion is itself a renaming of an
-- object.
--
-- View conversions of an object of a 2nd level type extension are
-- checked for equality with record aggregates of various ancestor types.
-- In one case, the view conversion is to a class-wide type, and it is
-- checked for equality with the result of a class-wide function with
-- the following structure:
--
-- function F return T'Class is
-- A : DDT := Expected_Value;
-- X : T'Class := T(A);
-- begin
-- return X;
--
-- end F;
--
-- ...
--
-- Var : DDT := Expected_Value;
--
-- if (T'Class(Var) /= F) then -- Condition should yield FALSE.
-- FAIL;
-- end if;
--
-- The view conversion to which X is initialized does not affect the
-- value or tag of the operand; the tag of X is that of type DDT (not T),
-- and the components are those of A. The result of this function
-- should equal the value of an object of type DDT initialized to the
-- same value as F.A.
--
-- To check that assignment to a view conversion does not change the tag
-- of the operand, an assignment is made to a conversion of an object,
-- and the object is then passed as an actual to a dispatching operation.
-- Conversions to both specific and class-wide types are checked.
--
--
-- CHANGE HISTORY:
-- 20 Jul 95 SAIC Initial prerelease version.
-- 24 Apr 96 SAIC Added type conversions.
--
--!
package C460006_0 is
type Call_ID_Kind is (None, Parent_Outer, Parent_Inner,
Child_Outer, Child_Inner,
Grandchild_Outer, Grandchild_Inner);
type Root_Type is abstract tagged record
First_Call : Call_ID_Kind := None;
Second_Call : Call_ID_Kind := None;
end record;
procedure Inner_Proc (X : in out Root_Type) is abstract;
procedure Outer_Proc (X : in out Root_Type) is abstract;
end C460006_0;
--==================================================================--
package C460006_0.C460006_1 is
type Parent_Type is new Root_Type with record
C1 : Integer := 0;
end record;
procedure Inner_Proc (X : in out Parent_Type);
procedure Outer_Proc (X : in out Parent_Type);
end C460006_0.C460006_1;
--==================================================================--
package body C460006_0.C460006_1 is
procedure Inner_Proc (X : in out Parent_Type) is
begin
X.Second_Call := Parent_Inner;
end Inner_Proc;
-------------------------------------------------
procedure Outer_Proc (X : in out Parent_Type) is
begin
X.First_Call := Parent_Outer;
Inner_Proc ( Parent_Type'Class(X) );
end Outer_Proc;
end C460006_0.C460006_1;
--==================================================================--
package C460006_0.C460006_1.C460006_2 is
type Child_Type is new Parent_Type with record
C2 : String(1 .. 5) := "-----";
end record;
procedure Inner_Proc (X : in out Child_Type);
procedure Outer_Proc (X : in out Child_Type);
end C460006_0.C460006_1.C460006_2;
--==================================================================--
package body C460006_0.C460006_1.C460006_2 is
procedure Inner_Proc (X : in out Child_Type) is
begin
X.Second_Call := Child_Inner;
end Inner_Proc;
-------------------------------------------------
procedure Outer_Proc (X : in out Child_Type) is
begin
X.First_Call := Child_Outer;
Inner_Proc ( Parent_Type'Class(X) );
end Outer_Proc;
end C460006_0.C460006_1.C460006_2;
--==================================================================--
package C460006_0.C460006_1.C460006_2.C460006_3 is
type Grandchild_Type is new Child_Type with record
C3: String(1 .. 5) := "-----";
end record;
procedure Inner_Proc (X : in out Grandchild_Type);
procedure Outer_Proc (X : in out Grandchild_Type);
function ClassWide_Func return Parent_Type'Class;
Grandchild_Value : constant Grandchild_Type := (First_Call => None,
Second_Call => None,
C1 => 15,
C2 => "Hello",
C3 => "World");
end C460006_0.C460006_1.C460006_2.C460006_3;
--==================================================================--
package body C460006_0.C460006_1.C460006_2.C460006_3 is
procedure Inner_Proc (X : in out Grandchild_Type) is
begin
X.Second_Call := Grandchild_Inner;
end Inner_Proc;
-------------------------------------------------
procedure Outer_Proc (X : in out Grandchild_Type) is
begin
X.First_Call := Grandchild_Outer;
Inner_Proc ( Parent_Type'Class(X) );
end Outer_Proc;
-------------------------------------------------
function ClassWide_Func return Parent_Type'Class is
A : Grandchild_Type := Grandchild_Value;
X : Parent_Type'Class := Parent_Type(A); -- Value of X is still that of A.
begin
return X;
end ClassWide_Func;
end C460006_0.C460006_1.C460006_2.C460006_3;
--==================================================================--
with C460006_0.C460006_1.C460006_2.C460006_3;
with Report;
procedure C460006 is
package Root_Package renames C460006_0;
package Parent_Package renames C460006_0.C460006_1;
package Child_Package renames C460006_0.C460006_1.C460006_2;
package Grandchild_Package renames C460006_0.C460006_1.C460006_2.C460006_3;
begin
Report.Test ("C460006", "Check that a view conversion to a tagged type " &
"is permitted in the prefix of a selected component, an " &
"object renaming declaration, and (if the operand is a " &
"variable) on the left side of an assignment statement. " &
"Check that such a renaming or assignment does not change " &
" the tag of the operand");
--
-- Check conversion as prefix of selected component:
--
Selected_Component_Subtest:
declare
use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
Var : Grandchild_Type := Grandchild_Value;
CW_Var : Parent_Type'Class := Var;
Ren : Integer renames Parent_Type(Var).C1;
begin
if Ren /= 15 then
Report.Failed ("Wrong value: selected component in renaming");
end if;
if Child_Type(Var).C2 /= "Hello" then
Report.Failed ("Wrong value: selected component in IF");
end if;
Grandchild_Type(CW_Var).C3(2..4) := "eir";
if CW_Var /= Parent_Type'Class
(Grandchild_Type'(None, None, 15, "Hello", "Weird"))
then
Report.Failed ("Wrong value: selected component in assignment");
end if;
end Selected_Component_Subtest;
--
-- Check conversion in object renaming:
--
Object_Renaming_Subtest:
declare
use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
Var : Grandchild_Type := Grandchild_Value;
Ren1 : Parent_Type renames Parent_Type(Var);
Ren2 : Child_Type renames Child_Type(Var);
Ren3 : Parent_Type'Class renames Parent_Type'Class(Var);
Ren4 : Parent_Type renames Parent_Type(Ren2); -- Rename of rename.
begin
Outer_Proc (Ren1);
if Ren1 /= (Parent_Outer, Grandchild_Inner, 15) then
Report.Failed ("Value or tag not preserved by object renaming: Ren1");
end if;
Outer_Proc (Ren2);
if Ren2 /= (Child_Outer, Grandchild_Inner, 15, "Hello") then
Report.Failed ("Value or tag not preserved by object renaming: Ren2");
end if;
Outer_Proc (Ren3);
if Ren3 /= Parent_Type'Class
(Grandchild_Type'(Grandchild_Outer,
Grandchild_Inner,
15,
"Hello",
"World"))
then
Report.Failed ("Value or tag not preserved by object renaming: Ren3");
end if;
Outer_Proc (Ren4);
if Ren4 /= (Parent_Outer, Grandchild_Inner, 15) then
Report.Failed ("Value or tag not preserved by object renaming: Ren4");
end if;
end Object_Renaming_Subtest;
--
-- Check reading view conversion, and conversion as left side of assignment:
--
View_Conversion_Subtest:
declare
use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
Var : Grandchild_Type := Grandchild_Value;
Specific : Child_Type;
ClassWide : Parent_Type'Class := Var; -- Grandchild_Type tag.
begin
if Parent_Type(Var) /= (None, None, 15) then
Report.Failed ("View has wrong value: #1");
end if;
if Child_Type(Var) /= (None, None, 15, "Hello") then
Report.Failed ("View has wrong value: #2");
end if;
if Parent_Type'Class(Var) /= ClassWide_Func then
Report.Failed ("Upward view conversion did not preserve " &
"extension's components");
end if;
Parent_Type(Specific) := (None, None, 26); -- Assign to view.
Outer_Proc (Specific); -- Call dispatching op.
if Specific /= (Child_Outer, Child_Inner, 26, "-----") then
Report.Failed ("Value or tag not preserved by assignment: Specific");
end if;
Parent_Type(ClassWide) := (None, None, 44); -- Assign to view.
Outer_Proc (ClassWide); -- Call dispatching op.
if ClassWide /= Parent_Type'Class
(Grandchild_Type'(Grandchild_Outer,
Grandchild_Inner,
44,
"Hello",
"World"))
then
Report.Failed ("Value or tag not preserved by assignment: ClassWide");
end if;
end View_Conversion_Subtest;
Report.Result;
end C460006;
|
