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3 // modification, are permitted provided that the following conditions are
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5 //
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15 //
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27
28 #include <stdlib.h>
29
30 #include "src/v8.h"
31
32 #include "src/bignum-dtoa.h"
33
34 #include "src/base/platform/platform.h"
35 #include "src/double.h"
36 #include "test/cctest/cctest.h"
37 #include "test/cctest/gay-fixed.h"
38 #include "test/cctest/gay-precision.h"
39 #include "test/cctest/gay-shortest.h"
40
41 using namespace v8::internal;
42
43
44 // Removes trailing '0' digits.
45 // Can return the empty string if all digits are 0.
TrimRepresentation(Vector<char> representation)46 static void TrimRepresentation(Vector<char> representation) {
47 int len = StrLength(representation.start());
48 int i;
49 for (i = len - 1; i >= 0; --i) {
50 if (representation[i] != '0') break;
51 }
52 representation[i + 1] = '\0';
53 }
54
55
56 static const int kBufferSize = 100;
57
58
TEST(BignumDtoaVariousDoubles)59 TEST(BignumDtoaVariousDoubles) {
60 char buffer_container[kBufferSize];
61 Vector<char> buffer(buffer_container, kBufferSize);
62 int length;
63 int point;
64
65 BignumDtoa(1.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
66 CHECK_EQ(0, strcmp("1", buffer.start()));
67 CHECK_EQ(1, point);
68
69 BignumDtoa(1.0, BIGNUM_DTOA_FIXED, 3, buffer, &length, &point);
70 CHECK_GE(3, length - point);
71 TrimRepresentation(buffer);
72 CHECK_EQ(0, strcmp("1", buffer.start()));
73 CHECK_EQ(1, point);
74
75 BignumDtoa(1.0, BIGNUM_DTOA_PRECISION, 3, buffer, &length, &point);
76 CHECK_GE(3, length);
77 TrimRepresentation(buffer);
78 CHECK_EQ(0, strcmp("1", buffer.start()));
79 CHECK_EQ(1, point);
80
81 BignumDtoa(1.5, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
82 CHECK_EQ(0, strcmp("15", buffer.start()));
83 CHECK_EQ(1, point);
84
85 BignumDtoa(1.5, BIGNUM_DTOA_FIXED, 10, buffer, &length, &point);
86 CHECK_GE(10, length - point);
87 TrimRepresentation(buffer);
88 CHECK_EQ(0, strcmp("15", buffer.start()));
89 CHECK_EQ(1, point);
90
91 BignumDtoa(1.5, BIGNUM_DTOA_PRECISION, 10, buffer, &length, &point);
92 CHECK_GE(10, length);
93 TrimRepresentation(buffer);
94 CHECK_EQ(0, strcmp("15", buffer.start()));
95 CHECK_EQ(1, point);
96
97 double min_double = 5e-324;
98 BignumDtoa(min_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
99 CHECK_EQ(0, strcmp("5", buffer.start()));
100 CHECK_EQ(-323, point);
101
102 BignumDtoa(min_double, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
103 CHECK_GE(5, length - point);
104 TrimRepresentation(buffer);
105 CHECK_EQ(0, strcmp("", buffer.start()));
106
107 BignumDtoa(min_double, BIGNUM_DTOA_PRECISION, 5, buffer, &length, &point);
108 CHECK_GE(5, length);
109 TrimRepresentation(buffer);
110 CHECK_EQ(0, strcmp("49407", buffer.start()));
111 CHECK_EQ(-323, point);
112
113 double max_double = 1.7976931348623157e308;
114 BignumDtoa(max_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
115 CHECK_EQ(0, strcmp("17976931348623157", buffer.start()));
116 CHECK_EQ(309, point);
117
118 BignumDtoa(max_double, BIGNUM_DTOA_PRECISION, 7, buffer, &length, &point);
119 CHECK_GE(7, length);
120 TrimRepresentation(buffer);
121 CHECK_EQ(0, strcmp("1797693", buffer.start()));
122 CHECK_EQ(309, point);
123
124 BignumDtoa(4294967272.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
125 CHECK_EQ(0, strcmp("4294967272", buffer.start()));
126 CHECK_EQ(10, point);
127
128 BignumDtoa(4294967272.0, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
129 CHECK_EQ(0, strcmp("429496727200000", buffer.start()));
130 CHECK_EQ(10, point);
131
132
133 BignumDtoa(4294967272.0, BIGNUM_DTOA_PRECISION, 14, buffer, &length, &point);
134 CHECK_GE(14, length);
135 TrimRepresentation(buffer);
136 CHECK_EQ(0, strcmp("4294967272", buffer.start()));
137 CHECK_EQ(10, point);
138
139 BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_SHORTEST, 0,
140 buffer, &length, &point);
141 CHECK_EQ(0, strcmp("4185580496821357", buffer.start()));
142 CHECK_EQ(299, point);
143
144 BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_PRECISION, 20,
145 buffer, &length, &point);
146 CHECK_GE(20, length);
147 TrimRepresentation(buffer);
148 CHECK_EQ(0, strcmp("41855804968213567225", buffer.start()));
149 CHECK_EQ(299, point);
150
151 BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_SHORTEST, 0,
152 buffer, &length, &point);
153 CHECK_EQ(0, strcmp("5562684646268003", buffer.start()));
154 CHECK_EQ(-308, point);
155
156 BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_PRECISION, 1,
157 buffer, &length, &point);
158 CHECK_GE(1, length);
159 TrimRepresentation(buffer);
160 CHECK_EQ(0, strcmp("6", buffer.start()));
161 CHECK_EQ(-308, point);
162
163 BignumDtoa(2147483648.0, BIGNUM_DTOA_SHORTEST, 0,
164 buffer, &length, &point);
165 CHECK_EQ(0, strcmp("2147483648", buffer.start()));
166 CHECK_EQ(10, point);
167
168
169 BignumDtoa(2147483648.0, BIGNUM_DTOA_FIXED, 2,
170 buffer, &length, &point);
171 CHECK_GE(2, length - point);
172 TrimRepresentation(buffer);
173 CHECK_EQ(0, strcmp("2147483648", buffer.start()));
174 CHECK_EQ(10, point);
175
176 BignumDtoa(2147483648.0, BIGNUM_DTOA_PRECISION, 5,
177 buffer, &length, &point);
178 CHECK_GE(5, length);
179 TrimRepresentation(buffer);
180 CHECK_EQ(0, strcmp("21475", buffer.start()));
181 CHECK_EQ(10, point);
182
183 BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_SHORTEST, 0,
184 buffer, &length, &point);
185 CHECK_EQ(0, strcmp("35844466002796428", buffer.start()));
186 CHECK_EQ(299, point);
187
188 BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_PRECISION, 10,
189 buffer, &length, &point);
190 CHECK_GE(10, length);
191 TrimRepresentation(buffer);
192 CHECK_EQ(0, strcmp("35844466", buffer.start()));
193 CHECK_EQ(299, point);
194
195 uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000);
196 double v = Double(smallest_normal64).value();
197 BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
198 CHECK_EQ(0, strcmp("22250738585072014", buffer.start()));
199 CHECK_EQ(-307, point);
200
201 BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point);
202 CHECK_GE(20, length);
203 TrimRepresentation(buffer);
204 CHECK_EQ(0, strcmp("22250738585072013831", buffer.start()));
205 CHECK_EQ(-307, point);
206
207 uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
208 v = Double(largest_denormal64).value();
209 BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
210 CHECK_EQ(0, strcmp("2225073858507201", buffer.start()));
211 CHECK_EQ(-307, point);
212
213 BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point);
214 CHECK_GE(20, length);
215 TrimRepresentation(buffer);
216 CHECK_EQ(0, strcmp("2225073858507200889", buffer.start()));
217 CHECK_EQ(-307, point);
218
219 BignumDtoa(4128420500802942e-24, BIGNUM_DTOA_SHORTEST, 0,
220 buffer, &length, &point);
221 CHECK_EQ(0, strcmp("4128420500802942", buffer.start()));
222 CHECK_EQ(-8, point);
223
224 v = 3.9292015898194142585311918e-10;
225 BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
226 CHECK_EQ(0, strcmp("39292015898194143", buffer.start()));
227
228 v = 4194304.0;
229 BignumDtoa(v, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
230 CHECK_GE(5, length - point);
231 TrimRepresentation(buffer);
232 CHECK_EQ(0, strcmp("4194304", buffer.start()));
233
234 v = 3.3161339052167390562200598e-237;
235 BignumDtoa(v, BIGNUM_DTOA_PRECISION, 19, buffer, &length, &point);
236 CHECK_GE(19, length);
237 TrimRepresentation(buffer);
238 CHECK_EQ(0, strcmp("3316133905216739056", buffer.start()));
239 CHECK_EQ(-236, point);
240
241 v = 7.9885183916008099497815232e+191;
242 BignumDtoa(v, BIGNUM_DTOA_PRECISION, 4, buffer, &length, &point);
243 CHECK_GE(4, length);
244 TrimRepresentation(buffer);
245 CHECK_EQ(0, strcmp("7989", buffer.start()));
246 CHECK_EQ(192, point);
247
248 v = 1.0000000000000012800000000e+17;
249 BignumDtoa(v, BIGNUM_DTOA_FIXED, 1, buffer, &length, &point);
250 CHECK_GE(1, length - point);
251 TrimRepresentation(buffer);
252 CHECK_EQ(0, strcmp("100000000000000128", buffer.start()));
253 CHECK_EQ(18, point);
254 }
255
256
TEST(BignumDtoaGayShortest)257 TEST(BignumDtoaGayShortest) {
258 char buffer_container[kBufferSize];
259 Vector<char> buffer(buffer_container, kBufferSize);
260 int length;
261 int point;
262
263 Vector<const PrecomputedShortest> precomputed =
264 PrecomputedShortestRepresentations();
265 for (int i = 0; i < precomputed.length(); ++i) {
266 const PrecomputedShortest current_test = precomputed[i];
267 double v = current_test.v;
268 BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
269 CHECK_EQ(current_test.decimal_point, point);
270 CHECK_EQ(0, strcmp(current_test.representation, buffer.start()));
271 }
272 }
273
274
TEST(BignumDtoaGayFixed)275 TEST(BignumDtoaGayFixed) {
276 char buffer_container[kBufferSize];
277 Vector<char> buffer(buffer_container, kBufferSize);
278 int length;
279 int point;
280
281 Vector<const PrecomputedFixed> precomputed =
282 PrecomputedFixedRepresentations();
283 for (int i = 0; i < precomputed.length(); ++i) {
284 const PrecomputedFixed current_test = precomputed[i];
285 double v = current_test.v;
286 int number_digits = current_test.number_digits;
287 BignumDtoa(v, BIGNUM_DTOA_FIXED, number_digits, buffer, &length, &point);
288 CHECK_EQ(current_test.decimal_point, point);
289 CHECK_GE(number_digits, length - point);
290 TrimRepresentation(buffer);
291 CHECK_EQ(0, strcmp(current_test.representation, buffer.start()));
292 }
293 }
294
295
TEST(BignumDtoaGayPrecision)296 TEST(BignumDtoaGayPrecision) {
297 char buffer_container[kBufferSize];
298 Vector<char> buffer(buffer_container, kBufferSize);
299 int length;
300 int point;
301
302 Vector<const PrecomputedPrecision> precomputed =
303 PrecomputedPrecisionRepresentations();
304 for (int i = 0; i < precomputed.length(); ++i) {
305 const PrecomputedPrecision current_test = precomputed[i];
306 double v = current_test.v;
307 int number_digits = current_test.number_digits;
308 BignumDtoa(v, BIGNUM_DTOA_PRECISION, number_digits,
309 buffer, &length, &point);
310 CHECK_EQ(current_test.decimal_point, point);
311 CHECK_GE(number_digits, length);
312 TrimRepresentation(buffer);
313 CHECK_EQ(0, strcmp(current_test.representation, buffer.start()));
314 }
315 }
316