-- 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;