-- 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;