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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
41using namespace v8::internal;
42
43
44// Removes trailing '0' digits.
45// Can return the empty string if all digits are 0.
46static 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
56static const int kBufferSize = 100;
57
58
59TEST(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("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("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("1", buffer.start());
79  CHECK_EQ(1, point);
80
81  BignumDtoa(1.5, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
82  CHECK_EQ("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("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("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("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("", 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("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("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("1797693", buffer.start());
122  CHECK_EQ(309, point);
123
124  BignumDtoa(4294967272.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
125  CHECK_EQ("4294967272", buffer.start());
126  CHECK_EQ(10, point);
127
128  BignumDtoa(4294967272.0, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
129  CHECK_EQ("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("4294967272", buffer.start());
137  CHECK_EQ(10, point);
138
139  BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_SHORTEST, 0,
140             buffer, &length, &point);
141  CHECK_EQ("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("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("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("6", buffer.start());
161  CHECK_EQ(-308, point);
162
163  BignumDtoa(2147483648.0, BIGNUM_DTOA_SHORTEST, 0,
164             buffer, &length, &point);
165  CHECK_EQ("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("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("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("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("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("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("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("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("2225073858507200889", buffer.start());
217  CHECK_EQ(-307, point);
218
219  BignumDtoa(4128420500802942e-24, BIGNUM_DTOA_SHORTEST, 0,
220             buffer, &length, &point);
221  CHECK_EQ("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("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("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("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("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("100000000000000128", buffer.start());
253  CHECK_EQ(18, point);
254}
255
256
257TEST(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(current_test.representation, buffer.start());
271  }
272}
273
274
275TEST(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(current_test.representation, buffer.start());
292  }
293}
294
295
296TEST(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(current_test.representation, buffer.start());
314  }
315}
316