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test-dtoa.cc
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27 
28 #include <stdlib.h>
29 
30 #include "v8.h"
31 
32 #include "dtoa.h"
33 
34 #include "cctest.h"
35 #include "double.h"
36 #include "gay-fixed.h"
37 #include "gay-precision.h"
38 #include "gay-shortest.h"
39 #include "platform.h"
40 
41 
42 using namespace v8::internal;
43 
44 
45 // Removes trailing '0' digits.
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 
59 TEST(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 
267 TEST(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 
287 TEST(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 
310 TEST(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 }
CHECK_EQ
#define CHECK_EQ(expected, value)
Definition: checks.h:219
v8::internal::PrecomputedShortestRepresentations
Vector< const PrecomputedShortest > PrecomputedShortestRepresentations()
Definition: gay-shortest.cc:100043
v8::internal::PrecomputedPrecisionRepresentations
Vector< const PrecomputedPrecision > PrecomputedPrecisionRepresentations()
Definition: gay-precision.cc:100043
v8::internal::PrecomputedFixedRepresentations
Vector< const PrecomputedFixed > PrecomputedFixedRepresentations()
Definition: gay-fixed.cc:100043
CHECK_GE
#define CHECK_GE(a, b)
Definition: checks.h:228
v8::internal::Vector::start
T * start() const
Definition: utils.h:389
v8::internal::Vector::length
int length() const
Definition: utils.h:383
V8_2PART_UINT64_C
#define V8_2PART_UINT64_C(a, b)
Definition: globals.h:202
v8::internal::StrLength
int StrLength(const char *string)
Definition: utils.h:234
v8::internal::DoubleToAscii
void DoubleToAscii(double v, DtoaMode mode, int requested_digits, Vector< char > buffer, int *sign, int *length, int *point)
Definition: dtoa.cc:56
v8::internal::Double::value
double value() const
Definition: double.h:178