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/double.h" 35 #include "src/platform.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 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 } 332
