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1 -- C330002.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 if a subtype indication of a variable object defines an
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28 -- indefinite subtype, then there is an initialization expression.
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29 -- Check that the object remains so constrained throughout its lifetime.
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30 -- Check for cases of tagged record, arrays and generic formal type.
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31 --
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32 -- TEST DESCRIPTION:
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33 -- An indefinite subtype is either:
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34 -- a) An unconstrained array subtype.
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35 -- b) A subtype with unknown discriminants (this includes class-wide
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36 -- types).
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37 -- c) A subtype with unconstrained discriminants without defaults.
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38 --
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39 -- Declare tagged types with unconstrained discriminants without
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40 -- defaults. Declare an unconstrained array. Declare a generic formal
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41 -- type with an unknown discriminant and a formal object of this type.
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42 -- In the generic package, declare an object of the formal type using
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43 -- the formal object as its initial value. In the main program,
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44 -- declare objects of tagged types. Instantiate the generic package.
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45 -- The test checks that Constraint_Error is raised if an attempt is
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46 -- made to change bounds as well as discriminants of the objects of the
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47 -- indefinite subtypes.
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48 --
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49 --
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50 -- CHANGE HISTORY:
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51 -- 01 Nov 95 SAIC Initial prerelease version.
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52 -- 27 Jul 96 SAIC Modified test description & Report.Test. Added
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53 -- code to prevent dead variable optimization.
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54 --
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55 --!
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56
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57 package C330002_0 is
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58
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59 subtype Small_Num is Integer range 1 .. 20;
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60
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61 -- Types with unconstrained discriminants without defaults.
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62
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63 type Tag_Type (Disc : Small_Num) is tagged
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64 record
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65 S : String (1 .. Disc);
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66 end record;
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67
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68 function Tag_Value return Tag_Type;
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69
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70 procedure Assign_Tag (A : out Tag_Type);
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71
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72 procedure Avoid_Optimization_and_Fail (P : Tag_Type; Msg : String);
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73
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74 ---------------------------------------------------------------------
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75 -- An unconstrained array type.
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76
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77 type Array_Type is array (Positive range <>) of Integer;
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78
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79 function Array_Value return Array_Type;
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80
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81 procedure Assign_Array (A : out Array_Type);
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82
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83 ---------------------------------------------------------------------
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84 generic
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85 -- Type with an unknown discriminant.
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86 type Formal_Type (<>) is private;
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87 FT_Obj : Formal_Type;
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88 package Gen is
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89 Gen_Obj : Formal_Type := FT_Obj;
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90 end Gen;
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91
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92 end C330002_0;
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93
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94 --==================================================================--
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95
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96 with Report;
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97 package body C330002_0 is
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98
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99 procedure Assign_Tag (A : out Tag_Type) is
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100 begin
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101 A := (3, "Bye");
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102 end Assign_Tag;
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103
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104 ----------------------------------------------------------------------
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105 procedure Avoid_Optimization_and_Fail (P : Tag_Type; Msg : String) is
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106 Default : Tag_Type := (1, "!"); -- Unique value.
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107 begin
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108 if P = Default then -- Both If branches can't do the same thing.
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109 Report.Failed (Msg & ": Constraint_Error not raised");
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110 else -- Subtests should always select this path.
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111 Report.Failed ("Constraint_Error not raised " & Msg);
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112 end if;
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113 end Avoid_Optimization_and_Fail;
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114
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115 ----------------------------------------------------------------------
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116 function Tag_Value return Tag_Type is
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117 TO : Tag_Type := (4 , "ACVC");
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118 begin
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119 return TO;
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120 end Tag_Value;
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121
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122 ----------------------------------------------------------------------
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123 function Array_Value return Array_Type is
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124 IA : Array_Type := (20, 31);
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125 begin
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126 return IA;
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127 end Array_Value;
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128
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129 ----------------------------------------------------------------------
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130 procedure Assign_Array (A : out Array_Type) is
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131 begin
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132 A := (84, 36);
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133 end Assign_Array;
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134
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135 end C330002_0;
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136
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137 --==================================================================--
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138
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139 with Report;
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140 with C330002_0;
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141 use C330002_0;
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142
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143 procedure C330002 is
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144
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145 begin
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146 Report.Test ("C330002", "Check that if a subtype indication of a " &
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147 "variable object defines an indefinite subtype, then " &
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148 "there is an initialization expression. Check that " &
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149 "the object remains so constrained throughout its " &
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150 "lifetime. Check that Constraint_Error is raised " &
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151 "if an attempt is made to change bounds as well as " &
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152 "discriminants of the objects of the indefinite " &
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153 "subtypes. Check for cases of tagged record and generic " &
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154 "formal types");
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155
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156 TagObj_Block:
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157 declare
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158 TObj_ByAgg : Tag_Type := (5, "Hello"); -- Initial assignment is
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159 -- aggregate.
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160 TObj_ByObj : Tag_Type := TObj_ByAgg; -- Initial assignment is
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161 -- an object.
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162 TObj_ByFunc : Tag_Type := Tag_Value; -- Initial assignment is
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163 -- function return value.
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164 Ren_Obj : Tag_Type renames TObj_ByAgg;
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165
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166 begin
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167
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168 begin
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169 if (TObj_ByAgg.Disc /= 5) or (TObj_ByAgg.S /= "Hello") then
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170 Report.Failed ("Wrong initial values for TObj_ByAgg");
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171 end if;
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172
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173 TObj_ByAgg := (2, "Hi"); -- C_E, can't change the
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174 -- value of the discriminant.
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175
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176 Avoid_Optimization_and_Fail (TObj_ByAgg, "Subtest 1");
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177
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178 exception
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179 when Constraint_Error => null; -- Exception is expected.
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180 when others =>
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181 Report.Failed ("Unexpected exception - Subtest 1");
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182 end;
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183
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184
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185 begin
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186 Assign_Tag (Ren_Obj); -- C_E, can't change the
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187 -- value of the discriminant.
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188
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189 Avoid_Optimization_and_Fail (Ren_Obj, "Subtest 2");
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190
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191 exception
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192 when Constraint_Error => null; -- Exception is expected.
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193 when others =>
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194 Report.Failed ("Unexpected exception - Subtest 2");
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195 end;
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196
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197
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198 begin
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199 if (TObj_ByObj.Disc /= 5) or (TObj_ByObj.S /= "Hello") then
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200 Report.Failed ("Wrong initial values for TObj_ByObj");
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201 end if;
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202
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203 TObj_ByObj := (3, "Bye"); -- C_E, can't change the
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204 -- value of the discriminant.
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205
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206 Avoid_Optimization_and_Fail (TObj_ByObj, "Subtest 3");
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207
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208 exception
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209 when Constraint_Error => null; -- Exception is expected.
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210 when others =>
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211 Report.Failed ("Unexpected exception - Subtest 3");
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212 end;
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213
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214
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215 begin
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216 if (TObj_ByFunc.Disc /= 4) or (TObj_ByFunc.S /= "ACVC") then
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217 Report.Failed ("Wrong initial values for TObj_ByFunc");
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218 end if;
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219
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220 TObj_ByFunc := (5, "Aloha"); -- C_E, can't change the
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221 -- value of the discriminant.
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222
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223 Avoid_Optimization_and_Fail (TObj_ByFunc, "Subtest 4");
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224
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225 exception
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226 when Constraint_Error => null; -- Exception is expected.
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227 when others =>
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228 Report.Failed ("Unexpected exception - Subtest 4");
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229 end;
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230
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231 end TagObj_Block;
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232
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233
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234 ArrObj_Block:
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235 declare
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236 Arr_Const : constant Array_Type
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237 := (9, 7, 6, 8);
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238 Arr_ByAgg : Array_Type -- Initial assignment is
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239 := (10, 11, 12); -- aggregate.
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240 Arr_ByFunc : Array_Type -- Initial assignment is
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241 := Array_Value; -- function return value.
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242 Arr_ByObj : Array_Type -- Initial assignment is
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243 := Arr_ByAgg; -- object.
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244
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245 Arr_Obj : array (Positive range <>) of Integer
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246 := (1, 2, 3, 4, 5);
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247 begin
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248
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249 begin
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250 if (Arr_Const'First /= 1) or (Arr_Const'Last /= 4) then
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251 Report.Failed ("Wrong bounds for Arr_Const");
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252 end if;
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253
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254 if (Arr_ByAgg'First /= 1) or (Arr_ByAgg'Last /= 3) then
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255 Report.Failed ("Wrong bounds for Arr_ByAgg");
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256 end if;
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257
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258 if (Arr_ByFunc'First /= 1) or (Arr_ByFunc'Last /= 2) then
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259 Report.Failed ("Wrong bounds for Arr_ByFunc");
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260 end if;
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261
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262 if (Arr_ByObj'First /= 1) or (Arr_ByObj'Last /= 3) then
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263 Report.Failed ("Wrong bounds for Arr_ByObj");
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264 end if;
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265
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266 Assign_Array (Arr_ByObj); -- C_E, Arr_ByObj bounds are
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267 -- 1..3.
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268
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269 Report.Failed ("Constraint_Error not raised - Subtest 5");
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270
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271 exception
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272 when Constraint_Error => null; -- Exception is expected.
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273 when others =>
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274 Report.Failed ("Unexpected exception - Subtest 5");
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275 end;
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276
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277
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278 begin
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279 if (Arr_Obj'First /= 1) or (Arr_Obj'Last /= 5) then
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280 Report.Failed ("Wrong bounds for Arr_Obj");
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281 end if;
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282
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283 for I in 0 .. 5 loop
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284 Arr_Obj (I + 1) := I + 5; -- C_E, Arr_Obj bounds are
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285 end loop; -- 1..5.
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286
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287 Report.Failed ("Constraint_Error not raised - Subtest 6");
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288
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289 exception
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290 when Constraint_Error => null; -- Exception is expected.
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291 when others =>
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292 Report.Failed ("Unexpected exception - Subtest 6");
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293 end;
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294
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295 end ArrObj_Block;
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296
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297
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298 GenericObj_Block:
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299 declare
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300 type Rec (Disc : Small_Num) is
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301 record
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302 S : Small_Num := Disc;
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303 end record;
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304
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305 Rec_Obj : Rec := (2, 2);
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306 package IGen is new Gen (Rec, Rec_Obj);
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307
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308 begin
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309 IGen.Gen_Obj := (3, 3); -- C_E, can't change the
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310 -- value of the discriminant.
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311
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312 Report.Failed ("Constraint_Error not raised - Subtest 7");
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313
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314 -- Next line prevents dead assignment.
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315 Report.Comment ("Disc is" & Integer'Image (IGen.Gen_Obj.Disc));
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316
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317 exception
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318 when Constraint_Error => null; -- Exception is expected.
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319 when others =>
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320 Report.Failed ("Unexpected exception - Subtest 7");
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321
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322 end GenericObj_Block;
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323
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324 Report.Result;
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325
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326 end C330002;
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