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-- C3A2003.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, for X'Access of a general access type A, Program_Error is
-- raised if the accessibility level of X is deeper than that of A.
-- Check for the case where X denotes a view that is a dereference of an
-- access parameter, or a rename thereof. Check for the case where X is
-- an access parameter and the corresponding actual is another access
-- parameter.
--
-- TEST DESCRIPTION:
-- In order to satisfy accessibility requirements, the designated
-- object X must be at the same or a less deep nesting level than the
-- general access type A -- X must "live" as long as A. Nesting
-- levels are the run-time nestings of masters: block statements;
-- subprogram, task, and entry bodies; and accept statements. Packages
-- are invisible to accessibility rules.
--
-- This test declares subprograms with access parameters, within which
-- 'Access is attempted on a dereference of an access parameter, and
-- assigned to an access object whose type A is declared at some nesting
-- level. The test verifies that Program_Error is raised if the actual
-- corresponding to the access parameter is another access parameter,
-- and the actual corresponding to this second access parameter is:
--
-- (1) an expression of a named access type, and the accessibility
-- level of the named access type is deeper than that of the
-- access type A.
--
-- (2) a reference to the Access attribute (e.g., X'Access), and
-- the accessibility level of X is deeper than that of the
-- access type A.
--
-- Note that the static nesting level of the actual corresponding to the
-- access parameter can be deeper than that of the type A -- it is
-- the run-time nesting that matters for accessibility rules. Consider
-- the case where the access type A is declared within the called
-- subprogram. The accessibility check will never fail, even if the
-- actual happens to have a deeper static nesting level:
--
-- procedure P (X: access T) is
-- type A is access all T; -- Static level = 2, e.g.
-- Acc : A := X.all'Access; -- Check should never fail.
-- begin null; end;
-- . . .
-- procedure Q (Y: access T) is
-- begin
-- P(Y);
-- end;
-- . . .
-- declare
-- Actual : aliased T; -- Static level = 3, e.g.
-- begin
-- Q (Actual'Access);
-- end;
--
-- For the execution of Q (and hence P), the accessibility level of
-- type A will always be deeper than that of Actual, so there is no
-- danger of a dangling reference arising from the assignment to
-- Acc. Thus, X.all'Access is safe, even though the static nesting
-- level of Actual is deeper than that of A.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 15 Jul 98 EDS Avoid optimization.
-- 28 Jun 02 RLB Added pragma Elaborate_All (Report);.
--!
with report; use report; pragma Elaborate_All (report);
package C3A2003_0 is
type Desig is array (1 .. 10) of Integer;
X0 : aliased Desig := (Desig'Range => Ident_Int(3)); -- Level = 0.
type Acc_L0 is access all Desig; -- Level = 0.
A0 : Acc_L0;
type Result_Kind is (OK, P_E, O_E);
procedure Target_Is_Level_0_Nest (Y: access Desig; S: out Result_Kind);
procedure Never_Fails_Nest (Y: access Desig; S: out Result_Kind);
procedure Never_Fails_Same (Y: access Desig; S: out Result_Kind);
end C3A2003_0;
--==================================================================--
package body C3A2003_0 is
procedure Target_Is_Level_0_Nest (Y: access Desig; S: out Result_Kind) is
-- This procedure utilizes 'Access on a dereference of an access
-- parameter, and assigned to an access object whose type A is
-- declared at some nesting level. Program_Error is raised if
-- the accessibility level of the operand type is deeper than that
-- of the target type.
procedure Nested (X: access Desig; R: out Result_Kind) is
-- Dereference of an access_to_object value is aliased.
Ren : Desig renames X.all; -- Renaming of a dereference
begin -- of an access parameter.
-- The accessibility level of type A0 is 0.
A0 := Ren'Access;
R := OK;
exception
when Program_Error =>
R := P_E;
when others =>
R := O_E;
end Nested;
begin -- Target_Is_Level_0_Nest
Nested (Y, S);
end Target_Is_Level_0_Nest;
------------------------------------------------------------------
procedure Never_Fails_Nest (Y: access Desig; S: out Result_Kind) is
type Acc_Deeper is access all Desig;
AD : Acc_Deeper;
function Nested (X: access Desig) return Result_Kind is
begin
-- X.all'Access below will always be safe, since the accessibility
-- level (although not necessarily the static nesting depth) of the
-- type of AD will always be deeper than or the same as that of the
-- actual corresponding to Y.
AD := X.all'Access;
if Ident_Int (AD(4)) /= 3 then --Avoid Optimization of AD
FAILED ("Initial Values not correct.");
end if;
return OK;
exception
when Program_Error =>
return P_E;
when others =>
return O_E;
end Nested;
begin -- Never_Fails_Nest
S := Nested (Y);
end Never_Fails_Nest;
------------------------------------------------------------------
procedure Called_By_Never_Fails_Same
(X: access Desig; R: out Result_Kind) is
type Acc_Local is access all Desig;
AL : Acc_Local;
-- Dereference of an access_to_object value is aliased.
Ren : Desig renames X.all; -- Renaming of a dereference
begin -- of an access parameter.
-- Ren'Access below will always be safe, since the accessibility
-- level (although not necessarily the static nesting depth) of
-- type of AL will always be deeper than or the same as that of the
-- actual corresponding to Y.
AL := Ren'Access;
if Ident_Int (AL(4)) /= 3 then --Avoid Optimization of AL
FAILED ("Initial Values not correct.");
end if;
R := OK;
exception
when Program_Error =>
R := P_E;
when others =>
R := O_E;
end Called_By_Never_Fails_Same;
------------------------------------------------------------------
procedure Never_Fails_Same (Y: access Desig; S: out Result_Kind) is
begin
Called_By_Never_Fails_Same (Y, S);
end Never_Fails_Same;
end C3A2003_0;
--==================================================================--
with C3A2003_0;
use C3A2003_0;
with Report; use report;
procedure C3A2003 is
type Acc_L1 is access all Desig; -- Level = 1.
A1 : Acc_L1;
X1 : aliased Desig := (Desig'Range => Ident_Int(3));
Res : Result_Kind;
procedure Called_By_Target_L1 (X: access Desig; R: out Result_Kind) is
begin
-- The accessibility level of the type of A1 is 1.
A1 := X.all'Access;
if IDENT_INT (A1(4)) /= 3 then --Avoid optimization of A1
FAILED ("Initial values not correct.");
end if;
R := OK;
exception
when Program_Error =>
R := P_E;
when others =>
R := O_E;
end Called_By_Target_L1;
------------------------------------------------------------------
function Target_Is_Level_1_Same (Y: access Desig) return Result_Kind is
S : Result_Kind;
begin
Called_By_Target_L1 (Y, S);
return S;
end Target_Is_Level_1_Same;
------------------------------------------------------------------
procedure Display_Results (Result : in Result_Kind;
Expected: in Result_Kind;
Msg : in String) is
begin
if Result /= Expected then
case Result is
when OK => Report.Failed ("No exception raised: " & Msg);
when P_E => Report.Failed ("Program_Error raised: " & Msg);
when O_E => Report.Failed ("Unexpected exception raised: " & Msg);
end case;
end if;
end Display_Results;
begin -- C3A2003
Report.Test ("C3A2003", "Check that, for X'Access of general access " &
"type A, Program_Error is raised if the accessibility " &
"level of X is deeper than that of A: X is an access " &
"parameter; corresponding actual is another access " &
"parameter");
-- Accessibility level of actual is 0 (actual is X'Access):
Never_Fails_Same (X0'Access, Res);
Display_Results (Res, OK, "Never_Fails_Same, level 0 actual");
Never_Fails_Nest (X0'Access, Res);
Display_Results (Res, OK, "Target_L1_Nest, level 0 actual");
Target_Is_Level_0_Nest (X0'Access, Res);
Display_Results (Res, OK, "Target_L0_Nest, level 0 actual");
Res := Target_Is_Level_1_Same (X0'Access);
Display_Results (Res, OK, "Target_L1_Same, level 0 actual");
-- Accessibility level of actual is 1 (actual is X'Access):
Never_Fails_Same (X1'Access, Res);
Display_Results (Res, OK, "Never_Fails_Same, level 1 actual");
Never_Fails_Nest (X1'Access, Res);
Display_Results (Res, OK, "Target_L1_Nest, level 1 actual");
Target_Is_Level_0_Nest (X1'Access, Res);
Display_Results (Res, P_E, "Target_L0_Nest, level 1 actual");
Res := Target_Is_Level_1_Same (X1'Access);
Display_Results (Res, OK, "Target_L1_Same, level 1 actual");
Block_L2:
declare
X2 : aliased Desig := (Desig'Range => Ident_Int(3));
type Acc_L2 is access all Desig; -- Level = 2.
Expr_L2 : Acc_L2 := X2'Access;
begin
-- Accessibility level of actual is 2 (actual is expression of named
-- access type):
Never_Fails_Same (Expr_L2, Res);
Display_Results (Res, OK, "Never_Fails_Same, level 2 actual");
Never_Fails_Nest (Expr_L2, Res);
Display_Results (Res, OK, "Target_L1_Nest, level 2 actual");
Target_Is_Level_0_Nest (Expr_L2, Res);
Display_Results (Res, P_E, "Target_L0_Nest, level 2 actual");
Res := Target_Is_Level_1_Same (Expr_L2);
Display_Results (Res, P_E, "Target_L1_Same, level 2 actual");
end Block_L2;
Report.Result;
end C3A2003;
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