1// Copyright 2010 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include <stdlib.h>
29
30#include "src/v8.h"
31
32#include "src/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
42using namespace v8::internal;
43
44
45// Removes trailing '0' digits.
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(DtoaVariousDoubles) {
60  char buffer_container[kBufferSize];
61  Vector<char> buffer(buffer_container, kBufferSize);
62  int length;
63  int point;
64  int sign;
65
66  DoubleToAscii(0.0, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
67  CHECK_EQ("0", buffer.start());
68  CHECK_EQ(1, point);
69
70  DoubleToAscii(0.0, DTOA_FIXED, 2, buffer, &sign, &length, &point);
71  CHECK_EQ(1, length);
72  CHECK_EQ("0", buffer.start());
73  CHECK_EQ(1, point);
74
75  DoubleToAscii(0.0, DTOA_PRECISION, 3, buffer, &sign, &length, &point);
76  CHECK_EQ(1, length);
77  CHECK_EQ("0", buffer.start());
78  CHECK_EQ(1, point);
79
80  DoubleToAscii(1.0, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
81  CHECK_EQ("1", buffer.start());
82  CHECK_EQ(1, point);
83
84  DoubleToAscii(1.0, DTOA_FIXED, 3, buffer, &sign, &length, &point);
85  CHECK_GE(3, length - point);
86  TrimRepresentation(buffer);
87  CHECK_EQ("1", buffer.start());
88  CHECK_EQ(1, point);
89
90  DoubleToAscii(1.0, DTOA_PRECISION, 3, buffer, &sign, &length, &point);
91  CHECK_GE(3, length);
92  TrimRepresentation(buffer);
93  CHECK_EQ("1", buffer.start());
94  CHECK_EQ(1, point);
95
96  DoubleToAscii(1.5, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
97  CHECK_EQ("15", buffer.start());
98  CHECK_EQ(1, point);
99
100  DoubleToAscii(1.5, DTOA_FIXED, 10, buffer, &sign, &length, &point);
101  CHECK_GE(10, length - point);
102  TrimRepresentation(buffer);
103  CHECK_EQ("15", buffer.start());
104  CHECK_EQ(1, point);
105
106  DoubleToAscii(1.5, DTOA_PRECISION, 10, buffer, &sign, &length, &point);
107  CHECK_GE(10, length);
108  TrimRepresentation(buffer);
109  CHECK_EQ("15", buffer.start());
110  CHECK_EQ(1, point);
111
112  double min_double = 5e-324;
113  DoubleToAscii(min_double, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
114  CHECK_EQ("5", buffer.start());
115  CHECK_EQ(-323, point);
116
117  DoubleToAscii(min_double, DTOA_FIXED, 5, buffer, &sign, &length, &point);
118  CHECK_GE(5, length - point);
119  TrimRepresentation(buffer);
120  CHECK_EQ("", buffer.start());
121  CHECK_GE(-5, point);
122
123  DoubleToAscii(min_double, DTOA_PRECISION, 5, buffer, &sign, &length, &point);
124  CHECK_GE(5, length);
125  TrimRepresentation(buffer);
126  CHECK_EQ("49407", buffer.start());
127  CHECK_EQ(-323, point);
128
129  double max_double = 1.7976931348623157e308;
130  DoubleToAscii(max_double, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
131  CHECK_EQ("17976931348623157", buffer.start());
132  CHECK_EQ(309, point);
133
134  DoubleToAscii(max_double, DTOA_PRECISION, 7, buffer, &sign, &length, &point);
135  CHECK_GE(7, length);
136  TrimRepresentation(buffer);
137  CHECK_EQ("1797693", buffer.start());
138  CHECK_EQ(309, point);
139
140  DoubleToAscii(4294967272.0, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
141  CHECK_EQ("4294967272", buffer.start());
142  CHECK_EQ(10, point);
143
144  DoubleToAscii(4294967272.0, DTOA_FIXED, 5, buffer, &sign, &length, &point);
145  CHECK_GE(5, length - point);
146  TrimRepresentation(buffer);
147  CHECK_EQ("4294967272", buffer.start());
148  CHECK_EQ(10, point);
149
150
151  DoubleToAscii(4294967272.0, DTOA_PRECISION, 14,
152                buffer, &sign, &length, &point);
153  CHECK_GE(14, length);
154  TrimRepresentation(buffer);
155  CHECK_EQ("4294967272", buffer.start());
156  CHECK_EQ(10, point);
157
158  DoubleToAscii(4.1855804968213567e298, DTOA_SHORTEST, 0,
159                buffer, &sign, &length, &point);
160  CHECK_EQ("4185580496821357", buffer.start());
161  CHECK_EQ(299, point);
162
163  DoubleToAscii(4.1855804968213567e298, DTOA_PRECISION, 20,
164                buffer, &sign, &length, &point);
165  CHECK_GE(20, length);
166  TrimRepresentation(buffer);
167  CHECK_EQ("41855804968213567225", buffer.start());
168  CHECK_EQ(299, point);
169
170  DoubleToAscii(5.5626846462680035e-309, DTOA_SHORTEST, 0,
171                buffer, &sign, &length, &point);
172  CHECK_EQ("5562684646268003", buffer.start());
173  CHECK_EQ(-308, point);
174
175  DoubleToAscii(5.5626846462680035e-309, DTOA_PRECISION, 1,
176                buffer, &sign, &length, &point);
177  CHECK_GE(1, length);
178  TrimRepresentation(buffer);
179  CHECK_EQ("6", buffer.start());
180  CHECK_EQ(-308, point);
181
182  DoubleToAscii(-2147483648.0, DTOA_SHORTEST, 0,
183                buffer, &sign, &length, &point);
184  CHECK_EQ(1, sign);
185  CHECK_EQ("2147483648", buffer.start());
186  CHECK_EQ(10, point);
187
188
189  DoubleToAscii(-2147483648.0, DTOA_FIXED, 2, buffer, &sign, &length, &point);
190  CHECK_GE(2, length - point);
191  TrimRepresentation(buffer);
192  CHECK_EQ(1, sign);
193  CHECK_EQ("2147483648", buffer.start());
194  CHECK_EQ(10, point);
195
196  DoubleToAscii(-2147483648.0, DTOA_PRECISION, 5,
197                buffer, &sign, &length, &point);
198  CHECK_GE(5, length);
199  TrimRepresentation(buffer);
200  CHECK_EQ(1, sign);
201  CHECK_EQ("21475", buffer.start());
202  CHECK_EQ(10, point);
203
204  DoubleToAscii(-3.5844466002796428e+298, DTOA_SHORTEST, 0,
205                buffer, &sign, &length, &point);
206  CHECK_EQ(1, sign);
207  CHECK_EQ("35844466002796428", buffer.start());
208  CHECK_EQ(299, point);
209
210  DoubleToAscii(-3.5844466002796428e+298, DTOA_PRECISION, 10,
211                buffer, &sign, &length, &point);
212  CHECK_EQ(1, sign);
213  CHECK_GE(10, length);
214  TrimRepresentation(buffer);
215  CHECK_EQ("35844466", buffer.start());
216  CHECK_EQ(299, point);
217
218  uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000);
219  double v = Double(smallest_normal64).value();
220  DoubleToAscii(v, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
221  CHECK_EQ("22250738585072014", buffer.start());
222  CHECK_EQ(-307, point);
223
224  DoubleToAscii(v, DTOA_PRECISION, 20, buffer, &sign, &length, &point);
225  CHECK_GE(20, length);
226  TrimRepresentation(buffer);
227  CHECK_EQ("22250738585072013831", buffer.start());
228  CHECK_EQ(-307, point);
229
230  uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
231  v = Double(largest_denormal64).value();
232  DoubleToAscii(v, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
233  CHECK_EQ("2225073858507201", buffer.start());
234  CHECK_EQ(-307, point);
235
236  DoubleToAscii(v, DTOA_PRECISION, 20, buffer, &sign, &length, &point);
237  CHECK_GE(20, length);
238  TrimRepresentation(buffer);
239  CHECK_EQ("2225073858507200889", buffer.start());
240  CHECK_EQ(-307, point);
241
242  DoubleToAscii(4128420500802942e-24, DTOA_SHORTEST, 0,
243                buffer, &sign, &length, &point);
244  CHECK_EQ(0, sign);
245  CHECK_EQ("4128420500802942", buffer.start());
246  CHECK_EQ(-8, point);
247
248  v = -3.9292015898194142585311918e-10;
249  DoubleToAscii(v, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
250  CHECK_EQ("39292015898194143", buffer.start());
251
252  v = 4194304.0;
253  DoubleToAscii(v, DTOA_FIXED, 5, buffer, &sign, &length, &point);
254  CHECK_GE(5, length - point);
255  TrimRepresentation(buffer);
256  CHECK_EQ("4194304", buffer.start());
257
258  v = 3.3161339052167390562200598e-237;
259  DoubleToAscii(v, DTOA_PRECISION, 19, buffer, &sign, &length, &point);
260  CHECK_GE(19, length);
261  TrimRepresentation(buffer);
262  CHECK_EQ("3316133905216739056", buffer.start());
263  CHECK_EQ(-236, point);
264}
265
266
267TEST(DtoaGayShortest) {
268  char buffer_container[kBufferSize];
269  Vector<char> buffer(buffer_container, kBufferSize);
270  int sign;
271  int length;
272  int point;
273
274  Vector<const PrecomputedShortest> precomputed =
275      PrecomputedShortestRepresentations();
276  for (int i = 0; i < precomputed.length(); ++i) {
277    const PrecomputedShortest current_test = precomputed[i];
278    double v = current_test.v;
279    DoubleToAscii(v, DTOA_SHORTEST, 0, buffer, &sign, &length, &point);
280    CHECK_EQ(0, sign);  // All precomputed numbers are positive.
281    CHECK_EQ(current_test.decimal_point, point);
282    CHECK_EQ(current_test.representation, buffer.start());
283  }
284}
285
286
287TEST(DtoaGayFixed) {
288  char buffer_container[kBufferSize];
289  Vector<char> buffer(buffer_container, kBufferSize);
290  int sign;
291  int length;
292  int point;
293
294  Vector<const PrecomputedFixed> precomputed =
295      PrecomputedFixedRepresentations();
296  for (int i = 0; i < precomputed.length(); ++i) {
297    const PrecomputedFixed current_test = precomputed[i];
298    double v = current_test.v;
299    int number_digits = current_test.number_digits;
300    DoubleToAscii(v, DTOA_FIXED, number_digits, buffer, &sign, &length, &point);
301    CHECK_EQ(0, sign);  // All precomputed numbers are positive.
302    CHECK_EQ(current_test.decimal_point, point);
303    CHECK_GE(number_digits, length - point);
304    TrimRepresentation(buffer);
305    CHECK_EQ(current_test.representation, buffer.start());
306  }
307}
308
309
310TEST(DtoaGayPrecision) {
311  char buffer_container[kBufferSize];
312  Vector<char> buffer(buffer_container, kBufferSize);
313  int sign;
314  int length;
315  int point;
316
317  Vector<const PrecomputedPrecision> precomputed =
318      PrecomputedPrecisionRepresentations();
319  for (int i = 0; i < precomputed.length(); ++i) {
320    const PrecomputedPrecision current_test = precomputed[i];
321    double v = current_test.v;
322    int number_digits = current_test.number_digits;
323    DoubleToAscii(v, DTOA_PRECISION, number_digits,
324                  buffer, &sign, &length, &point);
325    CHECK_EQ(0, sign);  // All precomputed numbers are positive.
326    CHECK_EQ(current_test.decimal_point, point);
327    CHECK_GE(number_digits, length);
328    TrimRepresentation(buffer);
329    CHECK_EQ(current_test.representation, buffer.start());
330  }
331}
332