1-- C460008.A
2--
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16--                                    DISCLAIMER
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18--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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22--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
23--     PARTICULAR PURPOSE OF SAID MATERIAL.
24--*
25--
26-- OBJECTIVE:
27--     Check that conversion to a modular type raises Constraint_Error
28--     when the operand value is outside the base range of the modular type.
29--
30-- TEST DESCRIPTION:
31--      Test conversion from integer, float, fixed and decimal types to
32--      modular types.  Test conversion to mod 255, mod 256 and mod 258
33--      to test the boundaries of 8 bit (+/-) unsigned numbers.
34--      Test operand values that are negative, the value of the mod,
35--      and greater than the value of the mod.
36--      Declare a generic test procedure and instantiate it for each of the
37--      unsigned types for each operand type.
38--
39--
40-- CHANGE HISTORY:
41--      04 OCT 95   SAIC   Initial version
42--      15 MAY 96   SAIC   Revised for 2.1
43--      24 NOV 98   RLB    Moved decimal cases into new test, C460011, to
44--                         prevent this test from being inapplicable to
45--                         implementations not supporting decimal types.
46--
47--!
48
49------------------------------------------------------------------- C460008
50
51with Report;
52
53procedure C460008 is
54
55  Shy_By_One   : constant := 2**8-1;
56  Heavy_By_Two : constant := 2**8+2;
57
58  type Unsigned_Edge_8 is mod Shy_By_One;
59  type Unsigned_8_Bit  is mod 2**8;
60  type Unsigned_Over_8 is mod Heavy_By_Two;
61
62  NPC : constant String := " not properly converted";
63
64  procedure Assert( Truth: Boolean; Message: String ) is
65  begin
66    if not Truth then
67      Report.Failed(Message);
68    end if;
69  end Assert;
70
71-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
72
73  generic
74    type Source is range <>;
75    type Target is mod <>;
76  procedure Integer_Conversion_Check( For_The_Value : Source;
77                                      Message       : String );
78
79  procedure Integer_Conversion_Check( For_The_Value : Source;
80                                      Message       : String ) is
81
82    Item : Target;
83
84  begin
85    Item := Target( For_The_Value );
86    Report.Failed("Int expected Constraint_Error " & Message);
87    -- the call to Comment is to make the otherwise dead assignment to
88    -- Item live.
89    -- To avoid invoking C_E on a call to 'Image in Report.Failed that
90    -- could cause a false pass
91   Report.Comment("Value of" & Target'Image(Item) & NPC);
92  exception
93    when Constraint_Error => null; -- expected case
94    when others => Report.Failed("Int Raised wrong exception " & Message);
95  end Integer_Conversion_Check;
96
97  procedure Int_To_Short is
98    new Integer_Conversion_Check( Integer, Unsigned_Edge_8 );
99
100  procedure Int_To_Eight is
101    new Integer_Conversion_Check( Integer, Unsigned_8_Bit );
102
103  procedure Int_To_Wide is
104    new Integer_Conversion_Check( Integer, Unsigned_Over_8 );
105
106-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
107
108  generic
109    type Source is digits <>;
110    type Target is mod <>;
111  procedure Float_Conversion_Check( For_The_Value : Source;
112                                    Message       : String );
113
114  procedure Float_Conversion_Check( For_The_Value : Source;
115                                    Message       : String ) is
116
117    Item : Target;
118
119  begin
120    Item := Target( For_The_Value );
121    Report.Failed("Flt expected Constraint_Error " & Message);
122    Report.Comment("Value of" & Target'Image(Item) & NPC);
123  exception
124    when Constraint_Error => null; -- expected case
125    when others => Report.Failed("Flt raised wrong exception " & Message);
126  end Float_Conversion_Check;
127
128  procedure Float_To_Short is
129    new Float_Conversion_Check( Float, Unsigned_Edge_8 );
130
131  procedure Float_To_Eight is
132    new Float_Conversion_Check( Float, Unsigned_8_Bit );
133
134  procedure Float_To_Wide is
135    new Float_Conversion_Check( Float, Unsigned_Over_8 );
136
137  function Identity( Root_Beer: Float ) return Float is
138    -- a knockoff of Report.Ident_Int for type Float
139    Nothing : constant Float := 0.0;
140  begin
141    if Report.Ident_Bool( Root_Beer = Nothing ) then
142      return Nothing;
143    else
144      return Root_Beer;
145    end if;
146  end Identity;
147
148-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
149
150  generic
151    type Source is delta <>;
152    type Target is mod <>;
153  procedure Fixed_Conversion_Check( For_The_Value : Source;
154                                    Message       : String );
155
156  procedure Fixed_Conversion_Check( For_The_Value : Source;
157                                    Message       : String ) is
158
159    Item : Target;
160
161  begin
162    Item := Target( For_The_Value );
163    Report.Failed("Fix expected Constraint_Error " & Message);
164    Report.Comment("Value of" & Target'Image(Item) & NPC);
165  exception
166    when Constraint_Error => null; -- expected case
167    when others => Report.Failed("Fix raised wrong exception " & Message);
168  end Fixed_Conversion_Check;
169
170  procedure Fixed_To_Short is
171    new Fixed_Conversion_Check( Duration, Unsigned_Edge_8 );
172
173  procedure Fixed_To_Eight is
174    new Fixed_Conversion_Check( Duration, Unsigned_8_Bit );
175
176  procedure Fixed_To_Wide is
177    new Fixed_Conversion_Check( Duration, Unsigned_Over_8 );
178
179  function Identity( A_Stitch: Duration ) return Duration is
180    Threadbare : constant Duration := 0.0;
181  begin
182    if Report.Ident_Bool( A_Stitch = Threadbare ) then
183      return Threadbare;
184    else
185      return A_Stitch;
186    end if;
187  end Identity;
188
189-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
190
191begin  -- Main test procedure.
192
193  Report.Test ("C460008", "Check that conversion to " &
194                          "a modular type raises Constraint_Error when " &
195                          "the operand value is outside the base range " &
196                          "of the modular type" );
197
198
199  -- Integer Error cases
200
201  Int_To_Short( Report.Ident_Int( -1 ), "I2S Dynamic, Negative" );
202  Int_To_Short( Report.Ident_Int( Shy_By_One ), "I2S Dynamic, At_Mod" );
203  Int_To_Short( Report.Ident_Int( Heavy_By_Two+1 ), "I2S Dynamic, Over_Mod" );
204
205  Int_To_Eight( -Shy_By_One, "I28 Static,  Negative" );
206  Int_To_Eight( 2**8, "I28 Static,  At_Mod" );
207  Int_To_Eight( Heavy_By_Two+1, "I28 Static,  Over_Mod" );
208
209  Int_To_Wide ( Report.Ident_Int( -(Heavy_By_Two*2) ),
210                "I2W Dynamic, Negative" );
211  Int_To_Wide ( Heavy_By_Two, "I2W Static,  At_Mod" );
212  Int_To_Wide ( Report.Ident_Int( Heavy_By_Two*2 ), "I2W Dynamic, Over_Mod" );
213
214  -- Float Error cases
215
216  Float_To_Short( -13.31, "F2S Static,  Negative" );
217  Float_To_Short( Identity ( Float(Shy_By_One)), "F2S Dynamic, At_Mod" );
218  Float_To_Short( 6378.388, "F2S Static,  Over_Mod" );
219
220  Float_To_Eight( Identity( -99.3574 ), "F28 Dynamic, Negative" );
221  Float_To_Eight( 2.0**8, "F28 Static,  At_Mod" );
222  Float_To_Eight( 2.0**9, "F28 Static,  Over_Mod" );
223
224  Float_To_Wide ( -0.54953_93129_81644, "FTW Static,  Negative" );
225  Float_To_Wide ( Identity( 2.0**8 +2.0 ), "FTW Dynamic, At_Mod" );
226  Float_To_Wide ( Identity( 2.0**8 +2.5001 ), "FTW Dynamic, Over_Mod" );
227  Float_To_Wide ( Identity( Float'Last ), "FTW Dynamic, Over_Mod" );
228
229  -- Fixed Error cases
230
231  Fixed_To_Short( Identity( -5.00 ), "D2S Dynamic, Negative" );
232  Fixed_To_Short( Shy_By_One * 1.0, "D2S Static,  At_Mod" );
233  Fixed_To_Short( 1995.9, "D2S Static,  Over_Mod" );
234
235  Fixed_To_Eight( -0.5, "D28 Static, Negative" );
236  Fixed_To_Eight( 2.0*128, "D28 Static,  At_Mod" );
237  Fixed_To_Eight( Identity( 2001.2 ), "D28 Dynamic, Over_Mod" );
238
239  Fixed_To_Wide ( Duration'First, "D2W Static,  Negative" );
240  Fixed_To_Wide ( Identity( 2*128.0 +2.0 ), "D2W Dynamic, At_Mod" );
241  Fixed_To_Wide ( Duration'Last, "D2W Static,  Over_Mod" );
242
243  -- having made it this far, the rest is downhill...
244  -- check a few, correct, edge cases, and we're done
245
246  Eye_Dew: declare
247    A_Float   : Float    := 0.0;
248    Your_Time : Duration := 0.0;
249    Number    : Integer  := 0;
250
251    Little   : Unsigned_Edge_8;
252    Moderate : Unsigned_8_Bit;
253    Big      : Unsigned_Over_8;
254
255  begin
256    Little := Unsigned_Edge_8(A_Float);
257    Assert( Little = 0, "Float => Little, 0");
258
259
260    Moderate := Unsigned_8_Bit (Your_Time);
261    Assert( Moderate = 0, "Your_Time => Moderate, 0");
262
263    Big := Unsigned_Over_8 (Number);
264    Assert( Big = 0, "Number => Big, 0");
265
266    A_Float   := 2.0**8-2.0;
267    Your_Time := 2.0*128-2.0;
268    Number    := 2**8;
269
270    Little := Unsigned_Edge_8(A_Float);
271    Assert( Little = 254, "Float => Little, 254");
272
273    Little := Unsigned_Edge_8(Your_Time);
274    Assert( Little = 254, "Your_Time => Little, 254");
275
276    Big := Unsigned_Over_8 (A_Float + 2.0);
277    Assert( Big = 256, "Sense => Big, 256");
278
279    Big := Unsigned_Over_8 (Number);
280    Assert( Big = 256, "Number => Big, 256");
281
282  end Eye_Dew;
283
284  Report.Result;
285
286end C460008;
287