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-- C490003.A

--

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--     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;