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1 -- C460004.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 the operand type of a type conversion is class-wide,
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28 -- Constraint_Error is raised if the tag of the operand does not
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29 -- identify a specific type that is covered by or descended from the
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30 -- target type.
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31 --
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32 -- TEST DESCRIPTION:
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33 -- View conversions of class-wide operands to specific types are
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34 -- placed on the right and left sides of assignment statements, and
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35 -- conversions of class-wide operands to class-wide types are used
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36 -- as actual parameters to dispatching operations. In all cases, a
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37 -- check is made that Constraint_Error is raised if the tag of the
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38 -- operand does not identify a specific type covered by or descended
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39 -- from the target type, and not raised otherwise.
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40 --
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41 -- A specific type is descended from itself and from those types it is
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42 -- directly or indirectly derived from. A specific type is covered by
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43 -- itself and each class-wide type to whose class it belongs.
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44 --
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45 -- A class-wide type T'Class is descended from T and those types which
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46 -- T is descended from. A class-wide type is covered by each class-wide
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47 -- type to whose class it belongs.
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48 --
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49 --
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50 -- CHANGE HISTORY:
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51 -- 19 Jul 95 SAIC Initial prerelease version.
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52 -- 18 Apr 96 SAIC ACVC 2.1: Added a check for correct tag.
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53 --
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54 --!
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55 package C460004_0 is
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56
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57 type Tag_Type is tagged record
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58 C1 : Natural;
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59 end record;
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60
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61 procedure Proc (X : in out Tag_Type);
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62
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63
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64 type DTag_Type is new Tag_Type with record
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65 C2 : String (1 .. 5);
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66 end record;
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67
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68 procedure Proc (X : in out DTag_Type);
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69
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70
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71 type DDTag_Type is new DTag_Type with record
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72 C3 : String (1 .. 5);
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73 end record;
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74
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75 procedure Proc (X : in out DDTag_Type);
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76
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77 procedure NewProc (X : in DDTag_Type);
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78
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79 function CWFunc (X : Tag_Type'Class) return Tag_Type'Class;
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80
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81 end C460004_0;
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82
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83
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84 --==================================================================--
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85
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86 with Report;
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87 package body C460004_0 is
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88
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89 procedure Proc (X : in out Tag_Type) is
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90 begin
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91 X.C1 := 25;
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92 end Proc;
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93
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94 -----------------------------------------
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95 procedure Proc (X : in out DTag_Type) is
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96 begin
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97 Proc ( Tag_Type(X) );
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98 X.C2 := "Earth";
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99 end Proc;
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100
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101 -----------------------------------------
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102 procedure Proc (X : in out DDTag_Type) is
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103 begin
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104 Proc ( DTag_Type(X) );
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105 X.C3 := "Orbit";
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106 end Proc;
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107
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108 -----------------------------------------
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109 procedure NewProc (X : in DDTag_Type) is
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110 Y : DDTag_Type := X;
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111 begin
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112 Proc (Y);
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113 exception
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114 when others =>
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115 Report.Failed ("Unexpected exception in NewProc");
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116 end NewProc;
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117
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118 -----------------------------------------
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119 function CWFunc (X : Tag_Type'Class) return Tag_Type'Class is
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120 Y : Tag_Type'Class := X;
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121 begin
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122 Proc (Y);
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123 return Y;
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124 end CWFunc;
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125
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126 end C460004_0;
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127
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128
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129 --==================================================================--
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130
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131
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132 with C460004_0;
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133 use C460004_0;
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134
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135 with Report;
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136 procedure C460004 is
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137
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138 Tag_Type_Init : constant Tag_Type := (C1 => 0);
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139 DTag_Type_Init : constant DTag_Type := (Tag_Type_Init with "Hello");
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140 DDTag_Type_Init : constant DDTag_Type := (DTag_Type_Init with "World");
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141
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142 Tag_Type_Value : constant Tag_Type := (C1 => 25);
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143 DTag_Type_Value : constant DTag_Type := (Tag_Type_Value with "Earth");
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144 DDTag_Type_Value : constant DDTag_Type := (DTag_Type_Value with "Orbit");
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145
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146 begin
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147
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148 Report.Test ("C460004", "Check that for a view conversion of a " &
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149 "class-wide operand, Constraint_Error is raised if the " &
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150 "tag of the operand does not identify a specific type " &
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151 "covered by or descended from the target type");
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152
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153 --
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154 -- View conversion to specific type:
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155 --
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156
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157 declare
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158 procedure CW_Proc (P : Tag_Type'Class) is
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159 Target : Tag_Type := Tag_Type_Init;
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160 begin
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161 Target := Tag_Type(P);
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162 if (Target /= Tag_Type_Value) then
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163 Report.Failed ("Target has wrong value: #01");
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164 end if;
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165 exception
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166 when Constraint_Error =>
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167 Report.Failed ("Constraint_Error raised: #01");
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168 when others =>
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169 Report.Failed ("Unexpected exception: #01");
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170 end CW_Proc;
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171
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172 begin
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173 CW_Proc (DDTag_Type_Value);
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174 end;
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175
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176 ----------------------------------------------------------------------
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177
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178 declare
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179 Target : DTag_Type := DTag_Type_Init;
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180 begin
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181 Target := DTag_Type(CWFunc(DDTag_Type_Value));
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182 if (Target /= DTag_Type_Value) then
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183 Report.Failed ("Target has wrong value: #02");
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184 end if;
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185 exception
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186 when Constraint_Error => Report.Failed ("Constraint_Error raised: #02");
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187 when others => Report.Failed ("Unexpected exception: #02");
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188 end;
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189
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190 ----------------------------------------------------------------------
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191
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192 declare
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193 Target : DDTag_Type;
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194 begin
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195 Target := DDTag_Type(CWFunc(Tag_Type_Value));
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196 -- CWFunc returns a Tag_Type; its tag is preserved through
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197 -- the view conversion. Constraint_Error should be raised.
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198
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199 Report.Failed ("Constraint_Error not raised: #03");
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200
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201 exception
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202 when Constraint_Error => null; -- expected exception
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203 when others => Report.Failed ("Unexpected exception: #03");
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204 end;
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205
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206 ----------------------------------------------------------------------
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207
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208 declare
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209 procedure CW_Proc (P : Tag_Type'Class) is
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210 begin
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211 NewProc (DDTag_Type(P));
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212 Report.Failed ("Constraint_Error not raised: #04");
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213
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214 exception
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215 when Constraint_Error => null; -- expected exception
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216 when others => Report.Failed ("Unexpected exception: #04");
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217 end CW_Proc;
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218
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219 begin
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220 CW_Proc (DTag_Type_Value);
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221 end;
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222
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223 ----------------------------------------------------------------------
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224
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225 declare
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226 procedure CW_Proc (P : Tag_Type'Class) is
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227 Target : DDTag_Type := DDTag_Type_Init;
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228 begin
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229 Target := DDTag_Type(P);
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230 if (Target /= DDTag_Type_Value) then
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231 Report.Failed ("Target has wrong value: #05");
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232 end if;
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233
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234 exception
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235 when Constraint_Error =>
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236 Report.Failed ("Constraint_Error raised: #05");
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237 when others
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238 => Report.Failed ("Unexpected exception: #05");
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239 end CW_Proc;
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240
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241 begin
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242 CW_Proc (DDTag_Type_Value);
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243 end;
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244
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245
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246 --
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247 -- View conversion to class-wide type:
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248 --
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249
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250 declare
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251 procedure CW_Proc (P : Tag_Type'Class) is
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252 Operand : Tag_Type'Class := P;
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253 begin
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254 Proc( DTag_Type'Class(Operand) );
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255 Report.Failed ("Constraint_Error not raised: #06");
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256
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257 exception
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258 when Constraint_Error => null; -- expected exception
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259 when others => Report.Failed ("Unexpected exception: #06");
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260 end CW_Proc;
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261
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262 begin
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263 CW_Proc (Tag_Type_Init);
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264 end;
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265
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266 ----------------------------------------------------------------------
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267
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268 declare
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269 procedure CW_Proc (P : Tag_Type'Class) is
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270 Operand : Tag_Type'Class := P;
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271 begin
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272 Proc( DDTag_Type'Class(Operand) );
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273 Report.Failed ("Constraint_Error not raised: #07");
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274
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275 exception
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276 when Constraint_Error => null; -- expected exception
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277 when others => Report.Failed ("Unexpected exception: #07");
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278 end CW_Proc;
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279
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280 begin
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281 CW_Proc (Tag_Type_Init);
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282 end;
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283
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284 ----------------------------------------------------------------------
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285
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286 declare
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287 procedure CW_Proc (P : Tag_Type'Class) is
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288 Operand : Tag_Type'Class := P;
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289 begin
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290 Proc( DTag_Type'Class(Operand) );
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291 if Operand not in DTag_Type then
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292 Report.Failed ("Operand has wrong tag: #08");
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293 elsif (Operand /= Tag_Type'Class (DTag_Type_Value)) then
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294 Report.Failed ("Operand has wrong value: #08");
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295 end if;
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296
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297 exception
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298 when Constraint_Error =>
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299 Report.Failed ("Constraint_Error raised: #08");
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300 when others =>
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301 Report.Failed ("Unexpected exception: #08");
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302 end CW_Proc;
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303
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304 begin
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305 CW_Proc (DTag_Type_Init);
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306 end;
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307
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308 ----------------------------------------------------------------------
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309
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310 declare
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311 procedure CW_Proc (P : Tag_Type'Class) is
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312 Operand : Tag_Type'Class := P;
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313 begin
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314 Proc( Tag_Type'Class(Operand) );
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315 if Operand not in DDTag_Type then
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316 Report.Failed ("Operand has wrong tag: #09");
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317 elsif (Operand /= Tag_Type'Class (DDTag_Type_Value)) then
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318 Report.Failed ("Operand has wrong value: #09");
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319 end if;
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320
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321 exception
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322 when Constraint_Error =>
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323 Report.Failed ("Constraint_Error raised: #09");
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324 when others =>
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325 Report.Failed ("Unexpected exception: #09");
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326 end CW_Proc;
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327
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328 begin
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329 CW_Proc (DDTag_Type_Init);
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330 end;
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331
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332
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333 Report.Result;
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334
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335 end C460004;
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