| -- 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; |
