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diff --git a/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c460002.a b/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c460002.a new file mode 100644 index 000000000..945dd5677 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/ada/acats/tests/c4/c460002.a @@ -0,0 +1,330 @@ +-- C460002.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, +-- and the actual corresponding to the access parameter is another +-- access parameter. +-- +-- 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 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 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; +-- . . . +-- 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, 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 +-- 19 Dec 94 SAIC Changed maintenance documentation. +-- 15 Jul 98 EDS Avoid Optimization +-- 28 Jun 02 RLB Added pragma Elaborate_All. +--! + +with Report; use Report; pragma Elaborate_All (Report); +package C460002_0 is + + type Component is array (1 .. 10) of Natural; + + type Desig is record + C: Component; + end record; + + X0 : aliased Desig := (C=>(others => 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 C460002_0; + + + --==================================================================-- + + +package body C460002_0 is + + procedure Target_Is_Level_0_Nest (Y: access Desig; S: out Result_Kind) is + + procedure Nested (X: access Desig; R: out Result_Kind) is + -- This procedure attempts a type conversion on the access parameter to + -- an access type 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. + + 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 Nested; + + begin + 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 + -- The type conversion below will always be safe, since the + -- accessibility level (although not necessarily the static nesting + -- depth) of Acc_Deeper will always be deeper than or the same as that + -- of the actual corresponding to Y. + AD := Acc_Deeper(X); + if Natural(Ident_Int(AD.C(1))) /= 3 then --Avoid Optimization of AD + Report.Failed ("Initial Values not correct."); + end if; + return OK; + exception + when Program_Error => + return P_E; + when others => + return O_E; + end Nested; + + begin + 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; + 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); + if Natural(Ident_Int(AL.C(1))) /= 3 then --Avoid Optimization of AL + Report.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 C460002_0; + + + --==================================================================-- + + +with C460002_0; +use C460002_0; + +with Report; use Report; + +procedure C460002 is + + type Acc_L1 is access all Desig; -- Level = 1. + A1 : Acc_L1; + X1 : aliased Desig := (C=>(others => Ident_Int(3))); + Res : Result_Kind; + + + + procedure Called_By_Target_L1 (X: access Desig; R: out Result_Kind) is + begin + -- The accessibility level of type Acc_L1 is 1. + A1 := Acc_L1(X); + if Natural(Ident_Int(A1.C(1))) /= 3 then --Avoid Optimization of A1 + Report.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 -- C460002. + + Report.Test ("C460002", "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 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 := (C=>(others => 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 C460002; |