1-- C460011.A
2--
3--                             Grant of Unlimited Rights
4--
5--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687 and
6--     F08630-91-C-0015, the U.S. Government obtained unlimited rights in the
7--     software and documentation contained herein.  Unlimited rights are
8--     defined in DFAR 252.227-7013(a)(19).  By making this public release,
9--     the Government intends to confer upon all recipients unlimited rights
10--     equal to those held by the Government.  These rights include rights to
11--     use, duplicate, release or disclose the released technical data and
12--     computer software in whole or in part, in any manner and for any purpose
13--     whatsoever, and to have or permit others to do so.
14--
15--                                    DISCLAIMER
16--
17--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
18--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
19--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
20--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
21--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
22--     PARTICULAR PURPOSE OF SAID MATERIAL.
23--*
24--
25-- OBJECTIVE:
26--     Check that conversion of a decimal type to a modular type raises
27--     Constraint_Error when the operand value is outside the base range
28--     of the modular type.
29--     Check that a conversion of a decimal type to an integer type
30--     rounds correctly.
31--
32-- TEST DESCRIPTION:
33--      Test conversion from decimal types to modular types.  Test
34--      conversion to mod 255, mod 256 and mod 258 to test the boundaries
35--      of 8 bit (+/-) unsigned numbers.
36--      Test operand values that are negative, the value of the mod,
37--      and greater than the value of the mod.
38--      Declare a generic test procedure and instantiate it for each of the
39--      unsigned types for each operand type.
40--      Check that the operand is properly rounded during the conversion.
41--
42-- APPLICABILITY CRITERIA:
43--      This test is applicable to all implementations which support
44--      decimal types.
45--
46-- CHANGE HISTORY:
47--      24 NOV 98   RLB  Split decimal cases from C460008 into this
48--                       test, added conversions to integer types.
49--      18 JAN 99   RLB  Repaired errors in test.
50--
51--!
52
53------------------------------------------------------------------- C460011
54
55with Report;
56
57procedure C460011 is
58
59  Shy_By_One   : constant := 2**8-1;
60  Heavy_By_Two : constant := 2**8+2;
61
62  type Unsigned_Edge_8 is mod Shy_By_One;
63  type Unsigned_8_Bit  is mod 2**8;
64  type Unsigned_Over_8 is mod Heavy_By_Two;
65
66  type Signed_8_Bit is range -128 .. 127;
67  type Signed_Over_8 is range -200 .. 200;
68
69  NPC : constant String := " not properly converted";
70
71  procedure Assert( Truth: Boolean; Message: String ) is
72  begin
73    if not Truth then
74      Report.Failed(Message);
75    end if;
76  end Assert;
77
78-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
79
80  type Decim is delta 0.1 digits 5;    -- N/A => ERROR.
81
82  generic
83    type Source is delta <> digits <>;
84    type Target is mod <>;
85  procedure Decimal_Conversion_Check( For_The_Value : Source;
86                                      Message       : String );
87
88  procedure Decimal_Conversion_Check( For_The_Value : Source;
89                                      Message       : String ) is
90
91    Item : Target;
92
93  begin
94    Item := Target( For_The_Value );
95    Report.Failed("Deci expected Constraint_Error " & Message);
96    Report.Comment("Value of" & Target'Image(Item) & NPC);
97  exception
98    when Constraint_Error => null; -- expected case
99    when others => Report.Failed("Deci raised wrong exception " & Message);
100  end Decimal_Conversion_Check;
101
102  procedure Decim_To_Short is
103    new Decimal_Conversion_Check( Decim, Unsigned_Edge_8 );
104
105  procedure Decim_To_Eight is
106    new Decimal_Conversion_Check( Decim, Unsigned_8_Bit );
107
108  procedure Decim_To_Wide is
109    new Decimal_Conversion_Check( Decim, Unsigned_Over_8 );
110
111  function Identity( Launder: Decim ) return Decim is
112    Flat_Broke : constant Decim := 0.0;
113  begin
114    if Report.Ident_Bool( Launder = Flat_Broke ) then
115      return Flat_Broke;
116    else
117      return Launder;
118    end if;
119  end Identity;
120
121-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
122
123begin  -- Main test procedure.
124
125  Report.Test ("C460011", "Check that conversion to " &
126                          "a modular type raises Constraint_Error when " &
127                          "the operand value is outside the base range " &
128                          "of the modular type" );
129
130  -- Decimal Error cases
131
132  Decim_To_Short( Identity( -5.00 ), "M2S Dynamic, Negative" );
133  Decim_To_Short( Shy_By_One * 1.0, "M2S Static,  At_Mod" );
134  Decim_To_Short( 1995.9, "M2S Static,  Over_Mod" );
135
136  Decim_To_Eight( -0.5, "M28 Static, Negative" );
137  Decim_To_Eight( 2.0*128, "M28 Static,  At_Mod" );
138  Decim_To_Eight( Identity( 2001.2 ), "M28 Dynamic, Over_Mod" );
139
140  Decim_To_Wide ( Decim'First, "M2W Static,  Negative" );
141  Decim_To_Wide ( Identity( 2*128.0 +2.0 ), "M2W Dynamic, At_Mod" );
142  Decim_To_Wide ( Decim'Last, "M2W Static,  Over_Mod" );
143
144  -- Check a few, correct, edge cases, for modular types.
145
146  Eye_Dew: declare
147    Sense     : Decim    := 0.00;
148
149    Little   : Unsigned_Edge_8;
150    Moderate : Unsigned_8_Bit;
151    Big      : Unsigned_Over_8;
152
153  begin
154    Moderate := Unsigned_8_Bit (Sense);
155    Assert( Moderate = 0, "Sense => Moderate, 0");
156
157    Sense     := 2*128.0;
158
159    Big := Unsigned_Over_8 (Sense);
160    Assert( Big = 256, "Sense => Big, 256");
161
162  end Eye_Dew;
163
164  Rounding: declare
165    Easy     : Decim  := Identity ( 2.0);
166    Simple   : Decim  := Identity ( 2.1);
167    Halfway  : Decim  := Identity ( 2.5);
168    Upward   : Decim  := Identity ( 2.8);
169    Chop     : Decim  := Identity (-2.2);
170    Neg_Half : Decim  := Identity (-2.5);
171    Downward : Decim  := Identity (-2.7);
172
173    Little   : Unsigned_Edge_8;
174    Moderate : Unsigned_8_Bit;
175    Big      : Unsigned_Over_8;
176
177    Also_Little:Signed_8_Bit;
178    Also_Big : Signed_Over_8;
179
180  begin
181    Little := Unsigned_Edge_8 (Easy);
182    Assert( Little = 2, "Easy => Little, 2");
183
184    Moderate := Unsigned_8_Bit (Simple);
185    Assert( Moderate = 2, "Simple => Moderate, 2");
186
187    Big := Unsigned_Over_8 (Halfway); -- Rounds up by 4.6(33).
188    Assert( Big = 3, "Halfway => Big, 3");
189
190    Little := Unsigned_Edge_8 (Upward);
191    Assert( Little = 3, "Upward => Little, 3");
192
193    Also_Big := Signed_Over_8 (Halfway); -- Rounds up by 4.6(33).
194    Assert( Also_Big = 3, "Halfway => Also_Big, 3");
195
196    Also_Little := Signed_8_Bit (Chop);
197    Assert( Also_Little = -2, "Chop => Also_Little, -2");
198
199    Also_Big := Signed_Over_8 (Neg_Half); -- Rounds down by 4.6(33).
200    Assert( Also_Big = -3, "Halfway => Also_Big, -3");
201
202    Also_Little := Signed_8_Bit (Downward);
203    Assert( Also_Little = -3, "Downward => Also_Little, -3");
204
205  end Rounding;
206
207
208  Report.Result;
209
210end C460011;
211