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diff --git a/gcc/testsuite/ada/acats/tests/c4/c460001.a b/gcc/testsuite/ada/acats/tests/c4/c460001.a new file mode 100644 index 000000000..907b8564f --- /dev/null +++ b/gcc/testsuite/ada/acats/tests/c4/c460001.a @@ -0,0 +1,300 @@ +-- C460001.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 if the target type of a type conversion is a general +-- access type, Program_Error is raised if the accessibility level +-- of the operand type is deeper than that of the target type. +-- Check for the case where the operand is an access parameter. +-- +-- Check for cases where the actual corresponding to the access +-- parameter is: +-- (a) An allocator. +-- (b) An expression of a named access type. +-- (c) Obj'Access. +-- +-- TEST DESCRIPTION: +-- In order to satisfy accessibility requirements, the operand type +-- must be at the same or a less deep nesting level than the target +-- type -- the operand type must "live" as long as the target type. +-- 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 +-- a type conversion is attempted on the access parameter to an access +-- type A 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 target type -- 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 := A(X); -- 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, the +-- type conversion 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 C460001_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 Target_Is_Level_0 (X: access Desig; R : out Result_Kind); + procedure Never_Fails (X: access Desig; R : out Result_Kind); + +end C460001_0; + + + --==================================================================-- + + +package body C460001_0 is + + procedure Target_Is_Level_0 (X : access Desig; + R : out Result_Kind) is + begin + -- The accessibility level of type Acc_L0 is 0. + A0 := Acc_L0(X); + R := OK; + exception + when Program_Error => + R := P_E; + when others => + R := O_E; + end Target_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 + -- The type conversion below will always be safe, since the + -- accessibility level (although not necessarily the static nesting + -- depth) of Acc_Local will always be deeper than or the same as that + -- of the actual corresponding to X. + AL := Acc_Local(X); + R := OK; + exception + when Program_Error => + R := P_E; + when others => + R := O_E; + end Never_Fails; + +end C460001_0; + + + --==================================================================-- + + +with C460001_0; +with Report; + +procedure C460001 is + + X1 : aliased C460001_0.Desig; -- Level = 1. + + type Acc_L1 is access all C460001_0.Desig; -- Level = 1. + A1 : Acc_L1; + + Expr_L0 : C460001_0.Acc_L0 := C460001_0.X0'Access; + Expr_L1 : Acc_L1 := X1'Access; + + Res : C460001_0.Result_Kind; + + use type C460001_0.Result_Kind; + + ----------------------------------------------- + procedure Target_Is_Level_1 (X : access C460001_0.Desig; + R : out C460001_0.Result_Kind) is + begin + -- The accessibility level of type Acc_L1 is 1. + A1 := Acc_L1(X); + R := C460001_0.OK; + exception + when Program_Error => + R := C460001_0.P_E; + when others => + R := C460001_0.O_E; + end Target_Is_Level_1; + + ----------------------------------------------- + procedure Display_Results (Result : in C460001_0.Result_Kind; + Expected: in C460001_0.Result_Kind; + Message : in String) is + begin + if Result /= Expected then + case Result is + when C460001_0.OK => Report.Failed ("No exception raised: " & + Message); + when C460001_0.P_E => Report.Failed ("Program_Error raised: " & + Message); + when C460001_0.O_E => Report.Failed ("Unexpected exception " & + "raised: " & Message); + end case; + end if; + end Display_Results; + +begin -- C460001 + + Report.Test ("C460001", "Check that if the target type of a type " & + "conversion is a general access type, Program_Error is " & + "raised if the accessibility level of the operand type " & + "is deeper than that of the target type: operand is an " & + "access parameter; corresponding actual is an allocator, " & + "expression of a named access type, Obj'Access"); + + + -- Actual is X'Access: + + C460001_0.Never_Fails (X1'Access, Res); + Display_Results (Res, C460001_0.OK, "X1'Access, local access type"); + + C460001_0.Target_Is_Level_0 (X1'Access, Res); + Display_Results (Res, C460001_0.P_E, "X1'Access, level 0 access type"); + + Target_Is_Level_1 (C460001_0.X0'Access, Res); + Display_Results (Res, C460001_0.OK, "X0'Access, level 1 access type"); + + Target_Is_Level_1 (X1'Access, Res); + Display_Results (Res, C460001_0.OK, "X1'Access, level 1 access type"); + + C460001_0.Target_Is_Level_0 (C460001_0.X0'Access, Res); + Display_Results (Res, C460001_0.OK, "X0'Access, level 0 access type"); + + + -- Actual is expression of a named access type: + + C460001_0.Never_Fails (Expr_L0, Res); + Display_Results (Res, C460001_0.OK, "Expr_L0, local access type"); + + C460001_0.Target_Is_Level_0 (Expr_L0, Res); + Display_Results (Res, C460001_0.OK, "Expr_L0, level 0 access type"); + + C460001_0.Target_Is_Level_0 (Expr_L1, Res); + Display_Results (Res, C460001_0.P_E, "Expr_L1, level 0 access type"); + + Target_Is_Level_1 (Expr_L1, Res); + Display_Results (Res, C460001_0.OK, "Expr_L1, level 1 access type"); + + Target_Is_Level_1 (Expr_L0, Res); + Display_Results (Res, C460001_0.OK, "Expr_L0, level 1 access type"); + + -- Actual is allocator (level of execution = 2): + + C460001_0.Never_Fails (new C460001_0.Desig, Res); + Display_Results (Res, C460001_0.OK, "Allocator level 2, " & + "local access type"); + + C460001_0.Target_Is_Level_0 (new C460001_0.Desig, Res); + Display_Results (Res, C460001_0.P_E, "Allocator level 2, " & + "level 0 access type"); + + Target_Is_Level_1 (new C460001_0.Desig, Res); + Display_Results (Res, C460001_0.P_E, "Allocator level 2, " & + "level 1 access type"); + + + Block_L2: + declare + X2 : aliased C460001_0.Desig; -- Level = 2. + type Acc_L2 is access all C460001_0.Desig; -- Level = 2. + Expr_L2 : Acc_L2 := X1'Access; + begin + + -- Actual is X'Access: + + C460001_0.Never_Fails (X2'Access, Res); + Display_Results (Res, C460001_0.OK, "X2'Access, local access type"); + + Target_Is_Level_1 (X2'Access, Res); + Display_Results (Res, C460001_0.P_E, "X2'Access, level 1 access type"); + + -- Actual is expression of a named access type: + + C460001_0.Never_Fails (Expr_L2, Res); + Display_Results (Res, C460001_0.OK, "Expr_L2, local access type"); + + C460001_0.Target_Is_Level_0 (Expr_L2, Res); + Display_Results (Res, C460001_0.P_E, "Expr_L2, level 0 access type"); + + + -- Actual is allocator (level of execution = 3): + + C460001_0.Never_Fails (new C460001_0.Desig, Res); + Display_Results (Res, C460001_0.OK, "Allocator level 3, " & + "local access type"); + + Target_Is_Level_1 (new C460001_0.Desig, Res); + Display_Results (Res, C460001_0.P_E, "Allocator level 3, " & + "level 1 access type"); + + end Block_L2; + + Report.Result; + +end C460001; |