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+-- 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;