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111
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1 -- C460006.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 view conversion to a tagged type is permitted in the
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28 -- prefix of a selected component, an object renaming declaration, and
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29 -- (if the operand is a variable) on the left side of an assignment
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30 -- statement. Check that such a renaming or assignment does not change
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31 -- the tag of the operand.
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32 --
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33 -- Check that, for a view conversion of a tagged type, each
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34 -- nondiscriminant component of the new view denotes the matching
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35 -- component of the operand object. Check that reading the value of the
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36 -- view yields the result of converting the value of the operand object
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37 -- to the target subtype.
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38 --
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39 -- TEST DESCRIPTION:
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40 -- The fact that the tag of an object is not changed is verified by
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41 -- making calls to primitive operations which in turn make (re)dispatching
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42 -- calls, and confirming that the proper bodies are executed.
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43 --
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44 -- Selected components are checked in three contexts: as the object name
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45 -- in an object renaming declaration, as the left operand of an inequality
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46 -- operation, and as the left side of an assignment statement.
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47 --
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48 -- View conversions of an object of a 2nd level type extension are
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49 -- renamed as objects of an ancestor type and of a class-wide type. In
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50 -- one case the operand of the conversion is itself a renaming of an
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51 -- object.
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52 --
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53 -- View conversions of an object of a 2nd level type extension are
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54 -- checked for equality with record aggregates of various ancestor types.
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55 -- In one case, the view conversion is to a class-wide type, and it is
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56 -- checked for equality with the result of a class-wide function with
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57 -- the following structure:
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58 --
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59 -- function F return T'Class is
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60 -- A : DDT := Expected_Value;
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61 -- X : T'Class := T(A);
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62 -- begin
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63 -- return X;
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64 --
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65 -- end F;
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66 --
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67 -- ...
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68 --
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69 -- Var : DDT := Expected_Value;
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70 --
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71 -- if (T'Class(Var) /= F) then -- Condition should yield FALSE.
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72 -- FAIL;
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73 -- end if;
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74 --
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75 -- The view conversion to which X is initialized does not affect the
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76 -- value or tag of the operand; the tag of X is that of type DDT (not T),
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77 -- and the components are those of A. The result of this function
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78 -- should equal the value of an object of type DDT initialized to the
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79 -- same value as F.A.
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80 --
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81 -- To check that assignment to a view conversion does not change the tag
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82 -- of the operand, an assignment is made to a conversion of an object,
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83 -- and the object is then passed as an actual to a dispatching operation.
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84 -- Conversions to both specific and class-wide types are checked.
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85 --
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86 --
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87 -- CHANGE HISTORY:
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88 -- 20 Jul 95 SAIC Initial prerelease version.
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89 -- 24 Apr 96 SAIC Added type conversions.
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90 --
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91 --!
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92
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93 package C460006_0 is
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94
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95 type Call_ID_Kind is (None, Parent_Outer, Parent_Inner,
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96 Child_Outer, Child_Inner,
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97 Grandchild_Outer, Grandchild_Inner);
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98
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99 type Root_Type is abstract tagged record
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100 First_Call : Call_ID_Kind := None;
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101 Second_Call : Call_ID_Kind := None;
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102 end record;
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103
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104 procedure Inner_Proc (X : in out Root_Type) is abstract;
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105 procedure Outer_Proc (X : in out Root_Type) is abstract;
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106
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107 end C460006_0;
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108
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109
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110 --==================================================================--
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111
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112
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113 package C460006_0.C460006_1 is
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114
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115 type Parent_Type is new Root_Type with record
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116 C1 : Integer := 0;
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117 end record;
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118
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119 procedure Inner_Proc (X : in out Parent_Type);
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120 procedure Outer_Proc (X : in out Parent_Type);
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121
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122 end C460006_0.C460006_1;
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123
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124
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125 --==================================================================--
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126
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127
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128 package body C460006_0.C460006_1 is
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129
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130 procedure Inner_Proc (X : in out Parent_Type) is
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131 begin
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132 X.Second_Call := Parent_Inner;
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133 end Inner_Proc;
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134
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135 -------------------------------------------------
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136 procedure Outer_Proc (X : in out Parent_Type) is
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137 begin
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138 X.First_Call := Parent_Outer;
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139 Inner_Proc ( Parent_Type'Class(X) );
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140 end Outer_Proc;
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141
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142 end C460006_0.C460006_1;
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143
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144
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145 --==================================================================--
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146
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147
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148 package C460006_0.C460006_1.C460006_2 is
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149
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150 type Child_Type is new Parent_Type with record
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151 C2 : String(1 .. 5) := "-----";
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152 end record;
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153
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154 procedure Inner_Proc (X : in out Child_Type);
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155 procedure Outer_Proc (X : in out Child_Type);
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156
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157 end C460006_0.C460006_1.C460006_2;
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158
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159
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160 --==================================================================--
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161
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162
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163 package body C460006_0.C460006_1.C460006_2 is
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164
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165 procedure Inner_Proc (X : in out Child_Type) is
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166 begin
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167 X.Second_Call := Child_Inner;
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168 end Inner_Proc;
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169
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170 -------------------------------------------------
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171 procedure Outer_Proc (X : in out Child_Type) is
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172 begin
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173 X.First_Call := Child_Outer;
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174 Inner_Proc ( Parent_Type'Class(X) );
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175 end Outer_Proc;
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176
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177 end C460006_0.C460006_1.C460006_2;
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178
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179
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180 --==================================================================--
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181
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182
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183 package C460006_0.C460006_1.C460006_2.C460006_3 is
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184
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185 type Grandchild_Type is new Child_Type with record
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186 C3: String(1 .. 5) := "-----";
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187 end record;
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188
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189 procedure Inner_Proc (X : in out Grandchild_Type);
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190 procedure Outer_Proc (X : in out Grandchild_Type);
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191
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192
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193 function ClassWide_Func return Parent_Type'Class;
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194
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195
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196 Grandchild_Value : constant Grandchild_Type := (First_Call => None,
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197 Second_Call => None,
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198 C1 => 15,
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199 C2 => "Hello",
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200 C3 => "World");
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201
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202 end C460006_0.C460006_1.C460006_2.C460006_3;
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203
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204
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205 --==================================================================--
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206
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207
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208 package body C460006_0.C460006_1.C460006_2.C460006_3 is
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209
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210 procedure Inner_Proc (X : in out Grandchild_Type) is
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211 begin
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212 X.Second_Call := Grandchild_Inner;
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213 end Inner_Proc;
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214
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215 -------------------------------------------------
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216 procedure Outer_Proc (X : in out Grandchild_Type) is
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217 begin
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218 X.First_Call := Grandchild_Outer;
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219 Inner_Proc ( Parent_Type'Class(X) );
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220 end Outer_Proc;
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221
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222 -------------------------------------------------
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223 function ClassWide_Func return Parent_Type'Class is
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224 A : Grandchild_Type := Grandchild_Value;
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225 X : Parent_Type'Class := Parent_Type(A); -- Value of X is still that of A.
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226 begin
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227 return X;
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228 end ClassWide_Func;
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229
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230 end C460006_0.C460006_1.C460006_2.C460006_3;
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231
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232
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233 --==================================================================--
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234
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235
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236 with C460006_0.C460006_1.C460006_2.C460006_3;
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237
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238 with Report;
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239 procedure C460006 is
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240
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241 package Root_Package renames C460006_0;
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242 package Parent_Package renames C460006_0.C460006_1;
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243 package Child_Package renames C460006_0.C460006_1.C460006_2;
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244 package Grandchild_Package renames C460006_0.C460006_1.C460006_2.C460006_3;
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245
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246 begin
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247 Report.Test ("C460006", "Check that a view conversion to a tagged type " &
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248 "is permitted in the prefix of a selected component, an " &
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249 "object renaming declaration, and (if the operand is a " &
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250 "variable) on the left side of an assignment statement. " &
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251 "Check that such a renaming or assignment does not change " &
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252 " the tag of the operand");
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253
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254
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255 --
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256 -- Check conversion as prefix of selected component:
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257 --
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258
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259 Selected_Component_Subtest:
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260 declare
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261 use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
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262
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263 Var : Grandchild_Type := Grandchild_Value;
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264 CW_Var : Parent_Type'Class := Var;
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265
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266 Ren : Integer renames Parent_Type(Var).C1;
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267
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268 begin
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269 if Ren /= 15 then
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270 Report.Failed ("Wrong value: selected component in renaming");
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271 end if;
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272
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273 if Child_Type(Var).C2 /= "Hello" then
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274 Report.Failed ("Wrong value: selected component in IF");
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275 end if;
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276
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277 Grandchild_Type(CW_Var).C3(2..4) := "eir";
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278 if CW_Var /= Parent_Type'Class
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279 (Grandchild_Type'(None, None, 15, "Hello", "Weird"))
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280 then
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281 Report.Failed ("Wrong value: selected component in assignment");
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282 end if;
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283 end Selected_Component_Subtest;
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284
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285
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286 --
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287 -- Check conversion in object renaming:
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288 --
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289
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290 Object_Renaming_Subtest:
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291 declare
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292 use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
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293
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294 Var : Grandchild_Type := Grandchild_Value;
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295 Ren1 : Parent_Type renames Parent_Type(Var);
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296 Ren2 : Child_Type renames Child_Type(Var);
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297 Ren3 : Parent_Type'Class renames Parent_Type'Class(Var);
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298 Ren4 : Parent_Type renames Parent_Type(Ren2); -- Rename of rename.
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299 begin
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300 Outer_Proc (Ren1);
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301 if Ren1 /= (Parent_Outer, Grandchild_Inner, 15) then
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302 Report.Failed ("Value or tag not preserved by object renaming: Ren1");
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303 end if;
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304
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305 Outer_Proc (Ren2);
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306 if Ren2 /= (Child_Outer, Grandchild_Inner, 15, "Hello") then
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307 Report.Failed ("Value or tag not preserved by object renaming: Ren2");
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308 end if;
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309
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310 Outer_Proc (Ren3);
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311 if Ren3 /= Parent_Type'Class
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312 (Grandchild_Type'(Grandchild_Outer,
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313 Grandchild_Inner,
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314 15,
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315 "Hello",
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316 "World"))
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317 then
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318 Report.Failed ("Value or tag not preserved by object renaming: Ren3");
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319 end if;
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320
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321 Outer_Proc (Ren4);
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322 if Ren4 /= (Parent_Outer, Grandchild_Inner, 15) then
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323 Report.Failed ("Value or tag not preserved by object renaming: Ren4");
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324 end if;
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325 end Object_Renaming_Subtest;
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326
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327
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328 --
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329 -- Check reading view conversion, and conversion as left side of assignment:
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330 --
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331
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332 View_Conversion_Subtest:
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333 declare
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334 use Root_Package, Parent_Package, Child_Package, Grandchild_Package;
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335
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336 Var : Grandchild_Type := Grandchild_Value;
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337 Specific : Child_Type;
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338 ClassWide : Parent_Type'Class := Var; -- Grandchild_Type tag.
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339 begin
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340 if Parent_Type(Var) /= (None, None, 15) then
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341 Report.Failed ("View has wrong value: #1");
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342 end if;
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343
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344 if Child_Type(Var) /= (None, None, 15, "Hello") then
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345 Report.Failed ("View has wrong value: #2");
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346 end if;
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347
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348 if Parent_Type'Class(Var) /= ClassWide_Func then
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349 Report.Failed ("Upward view conversion did not preserve " &
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350 "extension's components");
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351 end if;
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352
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353
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354 Parent_Type(Specific) := (None, None, 26); -- Assign to view.
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355 Outer_Proc (Specific); -- Call dispatching op.
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356
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357 if Specific /= (Child_Outer, Child_Inner, 26, "-----") then
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358 Report.Failed ("Value or tag not preserved by assignment: Specific");
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359 end if;
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360
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361
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362 Parent_Type(ClassWide) := (None, None, 44); -- Assign to view.
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363 Outer_Proc (ClassWide); -- Call dispatching op.
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364
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365 if ClassWide /= Parent_Type'Class
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366 (Grandchild_Type'(Grandchild_Outer,
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367 Grandchild_Inner,
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368 44,
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369 "Hello",
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370 "World"))
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371 then
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372 Report.Failed ("Value or tag not preserved by assignment: ClassWide");
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373 end if;
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374 end View_Conversion_Subtest;
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375
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376 Report.Result;
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377
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378 end C460006;
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