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diff --git a/gcc-4.9/gcc/testsuite/ada/acats/tests/c3/c3a2002.a b/gcc-4.9/gcc/testsuite/ada/acats/tests/c3/c3a2002.a new file mode 100644 index 000000000..63ea7008b --- /dev/null +++ b/gcc-4.9/gcc/testsuite/ada/acats/tests/c3/c3a2002.a @@ -0,0 +1,295 @@ +-- C3A2002.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 cases where the actual corresponding to X is: +-- (a) An allocator. +-- (b) An expression of a named access type. +-- (c) Obj'Access. +-- +-- 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 the 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: +-- +-- (1) an allocator, and the accessibility level of the execution +-- of the called subprogram is deeper than that of the access +-- type A. +-- +-- (2) 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. +-- +-- (3) 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; +-- . . . +-- declare +-- Actual : aliased T; -- Static level = 3, e.g. +-- begin +-- P (Actual'Access); +-- end; +-- +-- For the execution of 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 +-- +--! + +package C3A2002_0 is + + type Desig is array (1 .. 10) of Integer; + + X0 : aliased Desig; -- Level = 0. + + type Acc_L0 is access all Desig; -- Level = 0. + A0 : Acc_L0; + + type Result_Kind is (OK, P_E, O_E); + + procedure A_Is_Level_0 (X: access Desig; R : out Result_Kind); + procedure Never_Fails (X: access Desig; R : out Result_Kind); + +end C3A2002_0; + + + --==================================================================-- + +package body C3A2002_0 is + + procedure A_Is_Level_0 (X : access Desig; + R : out Result_Kind) is + begin + -- The accessibility level of the type of A0 is 0. + A0 := X.all'Access; + R := OK; + exception + when Program_Error => + R := P_E; + when others => + R := O_E; + end A_Is_Level_0; + + ----------------------------------------------- + procedure Never_Fails (X: access Desig; + R : out Result_Kind) is + type Acc_Local is access all Desig; + AL : Acc_Local; + begin + -- X.all'Access below will always be safe, since the accessibility + -- level (although not necessarily the static nesting depth) of the + -- type of AL will always be deeper than or the same as that of the + -- actual corresponding to Y. + AL := X.all'Access; + R := OK; + exception + when Program_Error => + R := P_E; + when others => + R := O_E; + end Never_Fails; + +end C3A2002_0; + + + --==================================================================-- + + +with C3A2002_0; +with Report; + +procedure C3A2002 is + + X1 : aliased C3A2002_0.Desig; -- Level = 1. + + type Acc_L1 is access all C3A2002_0.Desig; -- Level = 1. + A1 : Acc_L1; + + Expr_L0 : C3A2002_0.Acc_L0 := C3A2002_0.X0'Access; + Expr_L1 : Acc_L1 := X1'Access; + + Res : C3A2002_0.Result_Kind; + + use type C3A2002_0.Result_Kind; + + ----------------------------------------------- + procedure A_Is_Level_1 (X : access C3A2002_0.Desig; + R : out C3A2002_0.Result_Kind) is + -- Dereference of an access_to_object value is aliased. + Ren : C3A2002_0.Desig renames X.all; -- Renaming of a dereference + begin -- of an access parameter. + -- The accessibility level of the type of A1 is 1. + A1 := Ren'Access; + R := C3A2002_0.OK; + exception + when Program_Error => + R := C3A2002_0.P_E; + when others => + R := C3A2002_0.O_E; + end A_Is_Level_1; + + ----------------------------------------------- + procedure Display_Results (Result : in C3A2002_0.Result_Kind; + Expected: in C3A2002_0.Result_Kind; + Message : in String) is + begin + if Result /= Expected then + case Result is + when C3A2002_0.OK => Report.Failed ("No exception raised: " & + Message); + when C3A2002_0.P_E => Report.Failed ("Program_Error raised: " & + Message); + when C3A2002_0.O_E => Report.Failed ("Unexpected exception " & + "raised: " & Message); + end case; + end if; + end Display_Results; + +begin -- C3A2002 + + Report.Test ("C3A2002", "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 an allocator, " & + "expression of a named access type, Obj'Access, or a " & + "rename thereof"); + + + -- Actual is X'Access: + + C3A2002_0.Never_Fails (C3A2002_0.X0'Access, Res); + Display_Results (Res, C3A2002_0.OK, "X0'Access, local access type"); + + C3A2002_0.A_Is_Level_0 (C3A2002_0.X0'Access, Res); + Display_Results (Res, C3A2002_0.OK, "X0'Access, level 0 access type"); + + C3A2002_0.A_Is_Level_0 (X1'Access, Res); + Display_Results (Res, C3A2002_0.P_E, "X1'Access, level 0 access type"); + + A_Is_Level_1 (X1'Access, Res); + Display_Results (Res, C3A2002_0.OK, "X1'Access, level 1 access type"); + + + -- Actual is expression of a named access type: + + C3A2002_0.Never_Fails (Expr_L1, Res); + Display_Results (Res, C3A2002_0.OK, "Expr_L1, local access type"); + + C3A2002_0.A_Is_Level_0 (Expr_L1, Res); + Display_Results (Res, C3A2002_0.P_E, "Expr_L1, level 0 access type"); + + A_Is_Level_1 (Expr_L0, Res); + Display_Results (Res, C3A2002_0.OK, "Expr_L0, level 1 access type"); + + A_Is_Level_1 (Expr_L1, Res); + Display_Results (Res, C3A2002_0.OK, "Expr_L1, level 1 access type"); + + -- Actual is allocator (level of execution = 2): + + C3A2002_0.Never_Fails (new C3A2002_0.Desig, Res); + Display_Results (Res, C3A2002_0.OK, "Allocator level 2, " & + "local access type"); + + -- Since actual is an allocator, its accessibility level is that of + -- the execution of the called subprogram, i.e., level 2. + + C3A2002_0.A_Is_Level_0 (new C3A2002_0.Desig, Res); + Display_Results (Res, C3A2002_0.P_E, "Allocator level 2, " & + "level 0 access type"); + + A_Is_Level_1 (new C3A2002_0.Desig, Res); + Display_Results (Res, C3A2002_0.P_E, "Allocator level 2, " & + "level 1 access type"); + + + Block_L2: + declare + X2 : aliased C3A2002_0.Desig; -- Level = 2. + type Acc_L2 is access all C3A2002_0.Desig; -- Level = 2. + Expr_L2 : Acc_L2 := X1'Access; + begin + + -- Actual is X'Access: + + C3A2002_0.Never_Fails (X2'Access, Res); + Display_Results (Res, C3A2002_0.OK, "X2'Access, local access type"); + + C3A2002_0.A_Is_Level_0 (X2'Access, Res); + Display_Results (Res, C3A2002_0.P_E, "X2'Access, level 0 access type"); + + + -- Actual is expression of a named access type: + + A_Is_Level_1 (Expr_L2, Res); + Display_Results (Res, C3A2002_0.P_E, "Expr_L2, level 1 access type"); + + + -- Actual is allocator (level of execution = 3): + + C3A2002_0.Never_Fails (new C3A2002_0.Desig, Res); + Display_Results (Res, C3A2002_0.OK, "Allocator level 3, " & + "local access type"); + + A_Is_Level_1 (new C3A2002_0.Desig, Res); + Display_Results (Res, C3A2002_0.P_E, "Allocator level 3, " & + "level 1 access type"); + + end Block_L2; + + Report.Result; + +end C3A2002; |