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111
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1 -- CB20006.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 exceptions are raised and properly handled (including
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28 -- propagation by reraise) in protected operations.
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29 --
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30 -- TEST DESCRIPTION:
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31 -- Declare a package with a protected type, including protected operation
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32 -- declarations and private data, simulating a counting semaphore.
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33 -- In the main procedure, perform calls on protected operations
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34 -- of the protected object designed to induce the raising of exceptions.
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35 --
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36 -- The exceptions raised are to be initially handled in the protected
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37 -- operations, but this handling involves the reraise of the exception
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38 -- and the propagation of the exception to the caller.
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39 --
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40 -- Ensure that the exceptions are raised, handled / reraised successfully
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41 -- in protected procedures and functions. Use "others" handlers in the
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42 -- protected operations.
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43 --
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44 --
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45 -- CHANGE HISTORY:
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46 -- 06 Dec 94 SAIC ACVC 2.0
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47 --
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48 --!
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49
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50 package CB20006_0 is -- Package Semaphore.
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51
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52 Reraised_In_Function,
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53 Reraised_In_Procedure,
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54 Handled_In_Function_Caller,
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55 Handled_In_Procedure_Caller : Boolean := False;
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56
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57 Resource_Overflow,
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58 Resource_Underflow : exception;
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59
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60 protected type Counting_Semaphore (Max_Resources : Integer) is
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61 procedure Secure;
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62 function Resource_Limit_Exceeded return Boolean;
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63 procedure Release;
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64 private
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65 Count : Integer := Max_Resources;
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66 end Counting_Semaphore;
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67
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68 end CB20006_0;
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69
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70 --=================================================================--
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71
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72 with Report;
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73
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74 package body CB20006_0 is -- Package Semaphore.
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75
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76 protected body Counting_Semaphore is
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77
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78 procedure Secure is
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79 begin
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80 if (Count = 0) then -- No resources left to secure.
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81 raise Resource_Underflow;
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82 Report.Failed
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83 ("Program control not transferred by raise in Procedure Secure");
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84 else
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85 Count := Count - 1; -- Available resources decremented.
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86 end if;
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87 exception
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88 when Resource_Underflow =>
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89 Reraised_In_Procedure := True;
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90 raise; -- Exception propagated to caller.
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91 Report.Failed ("Exception not propagated to caller from Secure");
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92 when others =>
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93 Report.Failed ("Unexpected exception raised in Secure");
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94 end Secure;
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95
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96
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97 function Resource_Limit_Exceeded return Boolean is
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98 begin
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99 if (Count > Max_Resources) then
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100 raise Resource_Overflow; -- Exception used as control flow
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101 -- mechanism.
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102 Report.Failed
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103 ("Specific raise did not alter program control" &
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104 " from Resource_Limit_Exceeded");
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105 else
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106 return (False);
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107 end if;
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108 exception
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109 when others =>
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110 Reraised_In_Function := True;
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111 raise; -- Exception propagated to caller.
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112 Report.Failed ("Exception not propagated to caller" &
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113 " from Resource_Limit_Exceeded");
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114 end Resource_Limit_Exceeded;
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115
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116
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117 procedure Release is
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118 begin
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119 Count := Count + 1; -- Count of resources available
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120 -- incremented.
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121 if Resource_Limit_Exceeded then -- Call to protected operation
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122 Count := Count - 1; -- function that raises/reraises
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123 -- an exception.
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124 Report.Failed("Resource limit exceeded");
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125 end if;
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126
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127 exception
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128 when others =>
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129 raise; -- Reraised and propagated again.
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130 Report.Failed ("Exception not reraised by procedure Release");
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131 end Release;
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132
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133
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134 end Counting_Semaphore;
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135
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136 end CB20006_0;
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137
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138
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139 --=================================================================--
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140
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141
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142 with CB20006_0; -- Package Semaphore.
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143 with Report;
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144
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145 procedure CB20006 is
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146 begin
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147
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148 Report.Test ("CB20006", "Check that exceptions are raised and " &
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149 "handled / reraised and propagated " &
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150 "correctly by protected operations" );
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151
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152 Test_Block:
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153 declare
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154
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155 package Semaphore renames CB20006_0;
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156
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157 Total_Resources_Available : constant := 1;
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158
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159 Resources : Semaphore.Counting_Semaphore (Total_Resources_Available);
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160 -- An object of protected type.
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161
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162 begin
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163
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164 Allocate_Resources:
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165 declare
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166 Loop_Count : Integer := Total_Resources_Available + 1;
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167 begin
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168 for I in 1..Loop_Count loop -- Force exception
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169 Resources.Secure;
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170 end loop;
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171 Report.Failed
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172 ("Exception not propagated from protected operation Secure");
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173 exception
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174 when Semaphore.Resource_Underflow => -- Exception propagated
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175 Semaphore.Handled_In_Procedure_Caller := True; -- from protected
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176 when others => -- procedure.
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177 Semaphore.Handled_In_Procedure_Caller := False;
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178 end Allocate_Resources;
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179
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180
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181 Deallocate_Resources:
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182 declare
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183 Loop_Count : Integer := Total_Resources_Available + 1;
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184 begin
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185 for I in 1..Loop_Count loop -- Force exception
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186 Resources.Release;
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187 end loop;
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188 Report.Failed
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189 ("Exception not propagated from protected operation Release");
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190 exception
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191 when Semaphore.Resource_Overflow => -- Exception propagated
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192 Semaphore.Handled_In_Function_Caller := True; -- from protected
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193 when others => -- function.
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194 Semaphore.Handled_In_Function_Caller := False;
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195 end Deallocate_Resources;
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196
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197
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198 if not (Semaphore.Reraised_In_Procedure and
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199 Semaphore.Reraised_In_Function and
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200 Semaphore.Handled_In_Procedure_Caller and
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201 Semaphore.Handled_In_Function_Caller)
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202 then -- Incorrect excpt. handling
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203 Report.Failed -- in protected operations.
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204 ("Improper exception handling/reraising by protected operations");
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205 end if;
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206
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207 exception
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208
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209 when others =>
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210 Report.Failed ("Unexpected exception " &
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211 " raised and propagated in test");
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212 end Test_Block;
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213
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214 Report.Result;
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215
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216
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217 end CB20006;
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