| -- C490003.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 a static expression is legal if its evaluation fails |
| -- no language-defined check other than Overflow_Check. Check that such |
| -- a static expression is legal if it is part of a larger static |
| -- expression, even if its value is outside the base range of the |
| -- expected type. |
| -- |
| -- Check that if a static expression is part of the right operand of a |
| -- short circuit control form whose value is determined by its left |
| -- operand, it is not evaluated. |
| -- |
| -- Check that a static expression in a non-static context is evaluated |
| -- exactly. |
| -- |
| -- TEST DESCRIPTION: |
| -- The first part of the objective is tested by constructing static |
| -- expressions which involve predefined operations of integer, floating |
| -- point, and fixed point subtypes. Intermediate expressions within the |
| -- static expressions have values outside the base range of the expected |
| -- type. In one case, the extended-range intermediates are compared as |
| -- part of a boolean expression. In the remaining two cases, further |
| -- predefined operations on the intermediates bring the final result |
| -- within the base range. An implementation which compiles these static |
| -- expressions satisfies this portion of the objective. A check is |
| -- performed at run-time to ensure that the static expressions evaluate |
| -- to values within the base range of their respective expected types. |
| -- |
| -- The second part of the objective is tested by constructing |
| -- short-circuit control forms whose left operands have the values |
| -- shown below: |
| -- |
| -- (TRUE) or else (...) |
| -- (FALSE) and then (...) |
| -- |
| -- In both cases the left operand determines the value of the condition. |
| -- In the test each right operand involves a division by zero, which will |
| -- raise Constraint_Error if evaluated. A check is made that no exception |
| -- is raised when each short-circuit control form is evaluated, and that |
| -- the value of the condition is that of the left operand. |
| -- |
| -- The third part of the objective is tested by evaluating static |
| -- expressions involving many operations in contexts which do not |
| -- require a static expression, and verifying that the exact |
| -- mathematical results are calculated. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 15 Sep 95 SAIC Initial prerelease version for ACVC 2.1. |
| -- 20 Oct 96 SAIC Modified expressions in C490003_0 to avoid |
| -- the use of universal operands. |
| -- |
| --! |
| |
| with System; |
| package C490003_0 is |
| |
| type My_Flt is digits System.Max_Digits; |
| |
| Flt_Range_Diff : My_Flt := (My_Flt'Base'Last - My_Flt'Base'First) - |
| (My_Flt'Last - My_Flt'First); -- OK. |
| |
| |
| type My_Fix is delta 0.125 range -128.0 .. 128.0; |
| |
| Symmetric : Boolean := (My_Fix'Base'Last - My_Fix'Base'First) = |
| (My_Fix'Base'Last + My_Fix'Base'Last); -- OK. |
| |
| |
| Center : constant Integer := Integer'Base'Last - |
| (Integer'Base'Last - |
| Integer'Base'First) / 2; -- OK. |
| |
| end C490003_0; |
| |
| |
| --==================================================================-- |
| |
| |
| with Ada.Numerics; |
| package C490003_1 is |
| |
| Zero : constant := 0.0; |
| Pi : constant := Ada.Numerics.Pi; |
| |
| Two_Pi : constant := 2.0 * Pi; |
| Half_Pi : constant := Pi/2.0; |
| |
| Quarter : constant := 90.0; |
| Half : constant := 180.0; |
| Full : constant := 360.0; |
| |
| Deg_To_Rad : constant := Half_Pi/90; |
| Rad_To_Deg : constant := 1.0/Deg_To_Rad; |
| |
| end C490003_1; |
| |
| |
| --==================================================================-- |
| |
| |
| with C490003_0; |
| with C490003_1; |
| |
| with Report; |
| procedure C490003 is |
| begin |
| Report.Test ("C490003", "Check that static expressions failing " & |
| "Overflow_Check are legal if part of a larger static " & |
| "expression. Check that static expressions as right " & |
| "operands of short-circuit control forms are not " & |
| "evaluated if value of control form is determined by " & |
| "left operand. Check that static expressions in non-static " & |
| "contexts are evaluated exactly"); |
| |
| |
| -- |
| -- Static expressions within larger static expressions: |
| -- |
| |
| |
| if C490003_0.Flt_Range_Diff not in C490003_0.My_Flt'Base'Range then |
| Report.Failed ("Error evaluating static expression: floating point"); |
| end if; |
| |
| if C490003_0.Symmetric not in Boolean'Range then |
| Report.Failed ("Error evaluating static expression: fixed point"); |
| end if; |
| |
| if C490003_0.Center not in Integer'Base'Range then |
| Report.Failed ("Error evaluating static expression: integer"); |
| end if; |
| |
| |
| -- |
| -- Short-circuit control forms: |
| -- |
| |
| declare |
| N : constant := 0.0; |
| begin |
| |
| begin |
| if not ( (N = 0.0) or else (1.0/N > 0.5) ) then |
| Report.Failed ("Error evaluating OR ELSE"); |
| end if; |
| exception |
| when Constraint_Error => |
| Report.Failed ("Right side of OR ELSE was evaluated"); |
| when others => |
| Report.Failed ("OR ELSE: unexpected exception raised"); |
| end; |
| |
| begin |
| if (N /= 0.0) and then (1.0/N <= 0.5) then |
| Report.Failed ("Error evaluating AND THEN"); |
| end if; |
| exception |
| when Constraint_Error => |
| Report.Failed ("Right side of AND THEN was evaluated"); |
| when others => |
| Report.Failed ("AND THEN: unexpected exception raised"); |
| end; |
| |
| end; |
| |
| |
| -- |
| -- Exact evaluation of static expressions: |
| -- |
| |
| |
| declare |
| use C490003_1; |
| |
| Left : constant := 6.0 + 0.3125*( (Full*0.375) + (Half/2.4) - |
| ((Quarter + 36.0)/3.0) )/10.0; -- 11.25 |
| Right : constant := (Pi/3.0) * 1.2 * (15.0/96.0); -- Pi/16 |
| begin |
| if Deg_To_Rad*Left /= Right then |
| Report.Failed ("Static expressions not evaluated exactly: #1"); |
| end if; |
| |
| if ((Pi*Rad_To_Deg)*2.0 + 4.0*Quarter)/16.0 /= Rad_To_Deg*(Pi/4.0) then |
| Report.Failed ("Static expressions not evaluated exactly: #2"); |
| end if; |
| end; |
| |
| |
| Report.Result; |
| end C490003; |
