-- C460001.A
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-- C460001.A
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--
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--
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-- Grant of Unlimited Rights
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-- Grant of Unlimited Rights
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--
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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-- to do so.
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--
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--
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-- DISCLAIMER
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-- DISCLAIMER
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--
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--*
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--
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--
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-- OBJECTIVE:
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-- OBJECTIVE:
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-- Check that if the target type of a type conversion is a general
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-- Check that if the target type of a type conversion is a general
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-- access type, Program_Error is raised if the accessibility level
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-- access type, Program_Error is raised if the accessibility level
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-- of the operand type is deeper than that of the target type.
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-- of the operand type is deeper than that of the target type.
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-- Check for the case where the operand is an access parameter.
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-- Check for the case where the operand is an access parameter.
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--
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--
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-- Check for cases where the actual corresponding to the access
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-- Check for cases where the actual corresponding to the access
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-- parameter is:
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-- parameter is:
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-- (a) An allocator.
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-- (a) An allocator.
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-- (b) An expression of a named access type.
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-- (b) An expression of a named access type.
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-- (c) Obj'Access.
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-- (c) Obj'Access.
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--
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--
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-- TEST DESCRIPTION:
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-- TEST DESCRIPTION:
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-- In order to satisfy accessibility requirements, the operand type
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-- In order to satisfy accessibility requirements, the operand type
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-- must be at the same or a less deep nesting level than the target
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-- must be at the same or a less deep nesting level than the target
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-- type -- the operand type must "live" as long as the target type.
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-- type -- the operand type must "live" as long as the target type.
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-- Nesting levels are the run-time nestings of masters: block statements;
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-- Nesting levels are the run-time nestings of masters: block statements;
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-- subprogram, task, and entry bodies; and accept statements. Packages
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-- subprogram, task, and entry bodies; and accept statements. Packages
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-- are invisible to accessibility rules.
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-- are invisible to accessibility rules.
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--
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--
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-- This test declares subprograms with access parameters, within which
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-- This test declares subprograms with access parameters, within which
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-- a type conversion is attempted on the access parameter to an access
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-- a type conversion is attempted on the access parameter to an access
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-- type A declared at some nesting level. The test verifies that
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-- type A declared at some nesting level. The test verifies that
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-- Program_Error is raised if the actual corresponding to the access
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-- Program_Error is raised if the actual corresponding to the access
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-- parameter is:
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-- parameter is:
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--
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--
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-- (1) an allocator, and the accessibility level of the execution
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-- (1) an allocator, and the accessibility level of the execution
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-- of the called subprogram is deeper than that of the access
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-- of the called subprogram is deeper than that of the access
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-- type A.
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-- type A.
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--
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--
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-- (2) an expression of a named access type, and the accessibility
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-- (2) an expression of a named access type, and the accessibility
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-- level of the named access type is deeper than that of the
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-- level of the named access type is deeper than that of the
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-- access type A.
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-- access type A.
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--
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--
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-- (3) a reference to the Access attribute (e.g., X'Access), and
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-- (3) a reference to the Access attribute (e.g., X'Access), and
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-- the accessibility level of X is deeper than that of the
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-- the accessibility level of X is deeper than that of the
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-- access type A.
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-- access type A.
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--
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--
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-- Note that the static nesting level of the actual corresponding to the
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-- Note that the static nesting level of the actual corresponding to the
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-- access parameter can be deeper than that of the target type -- it is
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-- access parameter can be deeper than that of the target type -- it is
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-- the run-time nesting that matters for accessibility rules. Consider
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-- the run-time nesting that matters for accessibility rules. Consider
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-- the case where the access type A is declared within the called
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-- the case where the access type A is declared within the called
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-- subprogram. The accessibility check will never fail, even if the
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-- subprogram. The accessibility check will never fail, even if the
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-- actual happens to have a deeper static nesting level:
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-- actual happens to have a deeper static nesting level:
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--
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--
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-- procedure P (X: access T) is
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-- procedure P (X: access T) is
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-- type A is access all T; -- Static level = 2, e.g.
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-- type A is access all T; -- Static level = 2, e.g.
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-- Acc : A := A(X); -- Check should never fail.
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-- Acc : A := A(X); -- Check should never fail.
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-- begin null; end;
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-- begin null; end;
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-- . . .
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-- . . .
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-- declare
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-- declare
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-- Actual : aliased T; -- Static level = 3, e.g.
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-- Actual : aliased T; -- Static level = 3, e.g.
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-- begin
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-- begin
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-- P (Actual'Access);
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-- P (Actual'Access);
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-- end;
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-- end;
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--
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--
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-- For the execution of P, the accessibility level of type A will
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-- For the execution of P, the accessibility level of type A will
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-- always be deeper than that of Actual, so there is no danger of a
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-- always be deeper than that of Actual, so there is no danger of a
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-- dangling reference arising from the assignment to Acc. Thus, the
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-- dangling reference arising from the assignment to Acc. Thus, the
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-- type conversion is safe, even though the static nesting level of
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-- type conversion is safe, even though the static nesting level of
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-- Actual is deeper than that of A.
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-- Actual is deeper than that of A.
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--
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--
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--
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--
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-- CHANGE HISTORY:
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--
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--!
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--!
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package C460001_0 is
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package C460001_0 is
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type Desig is array (1 .. 10) of Integer;
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type Desig is array (1 .. 10) of Integer;
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X0 : aliased Desig; -- Level = 0.
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X0 : aliased Desig; -- Level = 0.
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type Acc_L0 is access all Desig; -- Level = 0.
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type Acc_L0 is access all Desig; -- Level = 0.
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A0 : Acc_L0;
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A0 : Acc_L0;
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type Result_Kind is (OK, P_E, O_E);
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type Result_Kind is (OK, P_E, O_E);
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procedure Target_Is_Level_0 (X: access Desig; R : out Result_Kind);
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procedure Target_Is_Level_0 (X: access Desig; R : out Result_Kind);
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procedure Never_Fails (X: access Desig; R : out Result_Kind);
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procedure Never_Fails (X: access Desig; R : out Result_Kind);
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end C460001_0;
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end C460001_0;
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--==================================================================--
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--==================================================================--
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package body C460001_0 is
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package body C460001_0 is
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procedure Target_Is_Level_0 (X : access Desig;
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procedure Target_Is_Level_0 (X : access Desig;
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R : out Result_Kind) is
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R : out Result_Kind) is
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begin
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begin
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-- The accessibility level of type Acc_L0 is 0.
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-- The accessibility level of type Acc_L0 is 0.
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A0 := Acc_L0(X);
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A0 := Acc_L0(X);
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R := OK;
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R := OK;
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exception
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exception
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when Program_Error =>
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when Program_Error =>
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R := P_E;
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R := P_E;
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when others =>
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when others =>
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R := O_E;
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R := O_E;
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end Target_Is_Level_0;
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end Target_Is_Level_0;
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-----------------------------------------------
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-----------------------------------------------
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procedure Never_Fails (X: access Desig;
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procedure Never_Fails (X: access Desig;
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R : out Result_Kind) is
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R : out Result_Kind) is
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type Acc_Local is access all Desig;
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type Acc_Local is access all Desig;
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AL : Acc_Local;
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AL : Acc_Local;
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begin
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begin
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-- The type conversion below will always be safe, since the
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-- The type conversion below will always be safe, since the
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-- accessibility level (although not necessarily the static nesting
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-- accessibility level (although not necessarily the static nesting
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-- depth) of Acc_Local will always be deeper than or the same as that
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-- depth) of Acc_Local will always be deeper than or the same as that
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-- of the actual corresponding to X.
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-- of the actual corresponding to X.
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AL := Acc_Local(X);
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AL := Acc_Local(X);
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R := OK;
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R := OK;
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exception
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exception
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when Program_Error =>
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when Program_Error =>
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R := P_E;
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R := P_E;
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when others =>
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when others =>
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R := O_E;
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R := O_E;
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end Never_Fails;
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end Never_Fails;
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end C460001_0;
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end C460001_0;
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--==================================================================--
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--==================================================================--
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with C460001_0;
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with C460001_0;
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with Report;
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with Report;
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procedure C460001 is
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procedure C460001 is
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X1 : aliased C460001_0.Desig; -- Level = 1.
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X1 : aliased C460001_0.Desig; -- Level = 1.
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type Acc_L1 is access all C460001_0.Desig; -- Level = 1.
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type Acc_L1 is access all C460001_0.Desig; -- Level = 1.
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A1 : Acc_L1;
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A1 : Acc_L1;
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Expr_L0 : C460001_0.Acc_L0 := C460001_0.X0'Access;
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Expr_L0 : C460001_0.Acc_L0 := C460001_0.X0'Access;
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Expr_L1 : Acc_L1 := X1'Access;
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Expr_L1 : Acc_L1 := X1'Access;
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Res : C460001_0.Result_Kind;
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Res : C460001_0.Result_Kind;
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use type C460001_0.Result_Kind;
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use type C460001_0.Result_Kind;
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-----------------------------------------------
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-----------------------------------------------
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procedure Target_Is_Level_1 (X : access C460001_0.Desig;
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procedure Target_Is_Level_1 (X : access C460001_0.Desig;
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R : out C460001_0.Result_Kind) is
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R : out C460001_0.Result_Kind) is
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begin
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begin
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-- The accessibility level of type Acc_L1 is 1.
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-- The accessibility level of type Acc_L1 is 1.
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A1 := Acc_L1(X);
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A1 := Acc_L1(X);
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R := C460001_0.OK;
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R := C460001_0.OK;
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exception
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exception
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when Program_Error =>
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when Program_Error =>
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R := C460001_0.P_E;
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R := C460001_0.P_E;
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when others =>
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when others =>
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R := C460001_0.O_E;
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R := C460001_0.O_E;
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end Target_Is_Level_1;
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end Target_Is_Level_1;
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-----------------------------------------------
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-----------------------------------------------
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procedure Display_Results (Result : in C460001_0.Result_Kind;
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procedure Display_Results (Result : in C460001_0.Result_Kind;
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Expected: in C460001_0.Result_Kind;
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Expected: in C460001_0.Result_Kind;
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Message : in String) is
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Message : in String) is
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begin
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begin
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if Result /= Expected then
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if Result /= Expected then
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case Result is
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case Result is
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when C460001_0.OK => Report.Failed ("No exception raised: " &
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when C460001_0.OK => Report.Failed ("No exception raised: " &
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Message);
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Message);
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when C460001_0.P_E => Report.Failed ("Program_Error raised: " &
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when C460001_0.P_E => Report.Failed ("Program_Error raised: " &
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Message);
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Message);
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when C460001_0.O_E => Report.Failed ("Unexpected exception " &
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when C460001_0.O_E => Report.Failed ("Unexpected exception " &
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"raised: " & Message);
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"raised: " & Message);
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end case;
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end case;
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end if;
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end if;
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end Display_Results;
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end Display_Results;
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begin -- C460001
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begin -- C460001
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Report.Test ("C460001", "Check that if the target type of a type " &
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Report.Test ("C460001", "Check that if the target type of a type " &
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"conversion is a general access type, Program_Error is " &
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"conversion is a general access type, Program_Error is " &
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"raised if the accessibility level of the operand type " &
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"raised if the accessibility level of the operand type " &
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"is deeper than that of the target type: operand is an " &
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"is deeper than that of the target type: operand is an " &
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"access parameter; corresponding actual is an allocator, " &
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"access parameter; corresponding actual is an allocator, " &
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"expression of a named access type, Obj'Access");
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"expression of a named access type, Obj'Access");
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-- Actual is X'Access:
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-- Actual is X'Access:
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C460001_0.Never_Fails (X1'Access, Res);
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C460001_0.Never_Fails (X1'Access, Res);
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Display_Results (Res, C460001_0.OK, "X1'Access, local access type");
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Display_Results (Res, C460001_0.OK, "X1'Access, local access type");
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C460001_0.Target_Is_Level_0 (X1'Access, Res);
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C460001_0.Target_Is_Level_0 (X1'Access, Res);
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Display_Results (Res, C460001_0.P_E, "X1'Access, level 0 access type");
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Display_Results (Res, C460001_0.P_E, "X1'Access, level 0 access type");
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Target_Is_Level_1 (C460001_0.X0'Access, Res);
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Target_Is_Level_1 (C460001_0.X0'Access, Res);
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Display_Results (Res, C460001_0.OK, "X0'Access, level 1 access type");
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Display_Results (Res, C460001_0.OK, "X0'Access, level 1 access type");
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Target_Is_Level_1 (X1'Access, Res);
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Target_Is_Level_1 (X1'Access, Res);
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Display_Results (Res, C460001_0.OK, "X1'Access, level 1 access type");
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Display_Results (Res, C460001_0.OK, "X1'Access, level 1 access type");
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C460001_0.Target_Is_Level_0 (C460001_0.X0'Access, Res);
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C460001_0.Target_Is_Level_0 (C460001_0.X0'Access, Res);
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Display_Results (Res, C460001_0.OK, "X0'Access, level 0 access type");
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Display_Results (Res, C460001_0.OK, "X0'Access, level 0 access type");
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|
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-- Actual is expression of a named access type:
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-- Actual is expression of a named access type:
|
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C460001_0.Never_Fails (Expr_L0, Res);
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C460001_0.Never_Fails (Expr_L0, Res);
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Display_Results (Res, C460001_0.OK, "Expr_L0, local access type");
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Display_Results (Res, C460001_0.OK, "Expr_L0, local access type");
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C460001_0.Target_Is_Level_0 (Expr_L0, Res);
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C460001_0.Target_Is_Level_0 (Expr_L0, Res);
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Display_Results (Res, C460001_0.OK, "Expr_L0, level 0 access type");
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Display_Results (Res, C460001_0.OK, "Expr_L0, level 0 access type");
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C460001_0.Target_Is_Level_0 (Expr_L1, Res);
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C460001_0.Target_Is_Level_0 (Expr_L1, Res);
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Display_Results (Res, C460001_0.P_E, "Expr_L1, level 0 access type");
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Display_Results (Res, C460001_0.P_E, "Expr_L1, level 0 access type");
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Target_Is_Level_1 (Expr_L1, Res);
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Target_Is_Level_1 (Expr_L1, Res);
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Display_Results (Res, C460001_0.OK, "Expr_L1, level 1 access type");
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Display_Results (Res, C460001_0.OK, "Expr_L1, level 1 access type");
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Target_Is_Level_1 (Expr_L0, Res);
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Target_Is_Level_1 (Expr_L0, Res);
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Display_Results (Res, C460001_0.OK, "Expr_L0, level 1 access type");
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Display_Results (Res, C460001_0.OK, "Expr_L0, level 1 access type");
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|
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-- Actual is allocator (level of execution = 2):
|
-- Actual is allocator (level of execution = 2):
|
|
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C460001_0.Never_Fails (new C460001_0.Desig, Res);
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C460001_0.Never_Fails (new C460001_0.Desig, Res);
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Display_Results (Res, C460001_0.OK, "Allocator level 2, " &
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Display_Results (Res, C460001_0.OK, "Allocator level 2, " &
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"local access type");
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"local access type");
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C460001_0.Target_Is_Level_0 (new C460001_0.Desig, Res);
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C460001_0.Target_Is_Level_0 (new C460001_0.Desig, Res);
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Display_Results (Res, C460001_0.P_E, "Allocator level 2, " &
|
Display_Results (Res, C460001_0.P_E, "Allocator level 2, " &
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"level 0 access type");
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"level 0 access type");
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|
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Target_Is_Level_1 (new C460001_0.Desig, Res);
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Target_Is_Level_1 (new C460001_0.Desig, Res);
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Display_Results (Res, C460001_0.P_E, "Allocator level 2, " &
|
Display_Results (Res, C460001_0.P_E, "Allocator level 2, " &
|
"level 1 access type");
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"level 1 access type");
|
|
|
|
|
Block_L2:
|
Block_L2:
|
declare
|
declare
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X2 : aliased C460001_0.Desig; -- Level = 2.
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X2 : aliased C460001_0.Desig; -- Level = 2.
|
type Acc_L2 is access all C460001_0.Desig; -- Level = 2.
|
type Acc_L2 is access all C460001_0.Desig; -- Level = 2.
|
Expr_L2 : Acc_L2 := X1'Access;
|
Expr_L2 : Acc_L2 := X1'Access;
|
begin
|
begin
|
|
|
-- Actual is X'Access:
|
-- Actual is X'Access:
|
|
|
C460001_0.Never_Fails (X2'Access, Res);
|
C460001_0.Never_Fails (X2'Access, Res);
|
Display_Results (Res, C460001_0.OK, "X2'Access, local access type");
|
Display_Results (Res, C460001_0.OK, "X2'Access, local access type");
|
|
|
Target_Is_Level_1 (X2'Access, Res);
|
Target_Is_Level_1 (X2'Access, Res);
|
Display_Results (Res, C460001_0.P_E, "X2'Access, level 1 access type");
|
Display_Results (Res, C460001_0.P_E, "X2'Access, level 1 access type");
|
|
|
-- Actual is expression of a named access type:
|
-- Actual is expression of a named access type:
|
|
|
C460001_0.Never_Fails (Expr_L2, Res);
|
C460001_0.Never_Fails (Expr_L2, Res);
|
Display_Results (Res, C460001_0.OK, "Expr_L2, local access type");
|
Display_Results (Res, C460001_0.OK, "Expr_L2, local access type");
|
|
|
C460001_0.Target_Is_Level_0 (Expr_L2, Res);
|
C460001_0.Target_Is_Level_0 (Expr_L2, Res);
|
Display_Results (Res, C460001_0.P_E, "Expr_L2, level 0 access type");
|
Display_Results (Res, C460001_0.P_E, "Expr_L2, level 0 access type");
|
|
|
|
|
-- Actual is allocator (level of execution = 3):
|
-- Actual is allocator (level of execution = 3):
|
|
|
C460001_0.Never_Fails (new C460001_0.Desig, Res);
|
C460001_0.Never_Fails (new C460001_0.Desig, Res);
|
Display_Results (Res, C460001_0.OK, "Allocator level 3, " &
|
Display_Results (Res, C460001_0.OK, "Allocator level 3, " &
|
"local access type");
|
"local access type");
|
|
|
Target_Is_Level_1 (new C460001_0.Desig, Res);
|
Target_Is_Level_1 (new C460001_0.Desig, Res);
|
Display_Results (Res, C460001_0.P_E, "Allocator level 3, " &
|
Display_Results (Res, C460001_0.P_E, "Allocator level 3, " &
|
"level 1 access type");
|
"level 1 access type");
|
|
|
end Block_L2;
|
end Block_L2;
|
|
|
Report.Result;
|
Report.Result;
|
|
|
end C460001;
|
end C460001;
|
|
|
