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111
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1 -- C490003.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- OBJECTIVE:
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27 -- Check that a static expression is legal if its evaluation fails
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28 -- no language-defined check other than Overflow_Check. Check that such
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29 -- a static expression is legal if it is part of a larger static
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30 -- expression, even if its value is outside the base range of the
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31 -- expected type.
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32 --
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33 -- Check that if a static expression is part of the right operand of a
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34 -- short circuit control form whose value is determined by its left
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35 -- operand, it is not evaluated.
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36 --
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37 -- Check that a static expression in a non-static context is evaluated
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38 -- exactly.
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39 --
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40 -- TEST DESCRIPTION:
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41 -- The first part of the objective is tested by constructing static
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42 -- expressions which involve predefined operations of integer, floating
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43 -- point, and fixed point subtypes. Intermediate expressions within the
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44 -- static expressions have values outside the base range of the expected
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45 -- type. In one case, the extended-range intermediates are compared as
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46 -- part of a boolean expression. In the remaining two cases, further
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47 -- predefined operations on the intermediates bring the final result
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48 -- within the base range. An implementation which compiles these static
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49 -- expressions satisfies this portion of the objective. A check is
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50 -- performed at run-time to ensure that the static expressions evaluate
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51 -- to values within the base range of their respective expected types.
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52 --
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53 -- The second part of the objective is tested by constructing
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54 -- short-circuit control forms whose left operands have the values
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55 -- shown below:
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56 --
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57 -- (TRUE) or else (...)
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58 -- (FALSE) and then (...)
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59 --
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60 -- In both cases the left operand determines the value of the condition.
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61 -- In the test each right operand involves a division by zero, which will
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62 -- raise Constraint_Error if evaluated. A check is made that no exception
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63 -- is raised when each short-circuit control form is evaluated, and that
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64 -- the value of the condition is that of the left operand.
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65 --
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66 -- The third part of the objective is tested by evaluating static
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67 -- expressions involving many operations in contexts which do not
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68 -- require a static expression, and verifying that the exact
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69 -- mathematical results are calculated.
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70 --
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71 --
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72 -- CHANGE HISTORY:
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73 -- 15 Sep 95 SAIC Initial prerelease version for ACVC 2.1.
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74 -- 20 Oct 96 SAIC Modified expressions in C490003_0 to avoid
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75 -- the use of universal operands.
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76 --
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77 --!
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78
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79 with System;
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80 package C490003_0 is
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81
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82 type My_Flt is digits System.Max_Digits;
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83
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84 Flt_Range_Diff : My_Flt := (My_Flt'Base'Last - My_Flt'Base'First) -
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85 (My_Flt'Last - My_Flt'First); -- OK.
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86
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87
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88 type My_Fix is delta 0.125 range -128.0 .. 128.0;
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89
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90 Symmetric : Boolean := (My_Fix'Base'Last - My_Fix'Base'First) =
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91 (My_Fix'Base'Last + My_Fix'Base'Last); -- OK.
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92
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93
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94 Center : constant Integer := Integer'Base'Last -
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95 (Integer'Base'Last -
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96 Integer'Base'First) / 2; -- OK.
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97
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98 end C490003_0;
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99
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100
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101 --==================================================================--
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102
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103
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104 with Ada.Numerics;
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105 package C490003_1 is
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106
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107 Zero : constant := 0.0;
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108 Pi : constant := Ada.Numerics.Pi;
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109
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110 Two_Pi : constant := 2.0 * Pi;
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111 Half_Pi : constant := Pi/2.0;
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112
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113 Quarter : constant := 90.0;
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114 Half : constant := 180.0;
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115 Full : constant := 360.0;
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116
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117 Deg_To_Rad : constant := Half_Pi/90;
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118 Rad_To_Deg : constant := 1.0/Deg_To_Rad;
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119
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120 end C490003_1;
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121
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122
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123 --==================================================================--
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124
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125
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126 with C490003_0;
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127 with C490003_1;
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128
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129 with Report;
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130 procedure C490003 is
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131 begin
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132 Report.Test ("C490003", "Check that static expressions failing " &
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133 "Overflow_Check are legal if part of a larger static " &
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134 "expression. Check that static expressions as right " &
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135 "operands of short-circuit control forms are not " &
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136 "evaluated if value of control form is determined by " &
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137 "left operand. Check that static expressions in non-static " &
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138 "contexts are evaluated exactly");
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139
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140
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141 --
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142 -- Static expressions within larger static expressions:
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143 --
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144
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145
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146 if C490003_0.Flt_Range_Diff not in C490003_0.My_Flt'Base'Range then
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147 Report.Failed ("Error evaluating static expression: floating point");
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148 end if;
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149
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150 if C490003_0.Symmetric not in Boolean'Range then
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151 Report.Failed ("Error evaluating static expression: fixed point");
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152 end if;
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153
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154 if C490003_0.Center not in Integer'Base'Range then
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155 Report.Failed ("Error evaluating static expression: integer");
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156 end if;
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157
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158
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159 --
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160 -- Short-circuit control forms:
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161 --
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162
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163 declare
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164 N : constant := 0.0;
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165 begin
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166
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167 begin
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168 if not ( (N = 0.0) or else (1.0/N > 0.5) ) then
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169 Report.Failed ("Error evaluating OR ELSE");
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170 end if;
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171 exception
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172 when Constraint_Error =>
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173 Report.Failed ("Right side of OR ELSE was evaluated");
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174 when others =>
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175 Report.Failed ("OR ELSE: unexpected exception raised");
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176 end;
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177
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178 begin
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179 if (N /= 0.0) and then (1.0/N <= 0.5) then
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180 Report.Failed ("Error evaluating AND THEN");
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181 end if;
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182 exception
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183 when Constraint_Error =>
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184 Report.Failed ("Right side of AND THEN was evaluated");
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185 when others =>
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186 Report.Failed ("AND THEN: unexpected exception raised");
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187 end;
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188
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189 end;
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190
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191
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192 --
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193 -- Exact evaluation of static expressions:
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194 --
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195
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196
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197 declare
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198 use C490003_1;
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199
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200 Left : constant := 6.0 + 0.3125*( (Full*0.375) + (Half/2.4) -
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201 ((Quarter + 36.0)/3.0) )/10.0; -- 11.25
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202 Right : constant := (Pi/3.0) * 1.2 * (15.0/96.0); -- Pi/16
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203 begin
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204 if Deg_To_Rad*Left /= Right then
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205 Report.Failed ("Static expressions not evaluated exactly: #1");
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206 end if;
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207
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208 if ((Pi*Rad_To_Deg)*2.0 + 4.0*Quarter)/16.0 /= Rad_To_Deg*(Pi/4.0) then
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209 Report.Failed ("Static expressions not evaluated exactly: #2");
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210 end if;
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211 end;
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212
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213
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214 Report.Result;
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215 end C490003;
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