| 1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 | * | |
| 3 | * ***** BEGIN LICENSE BLOCK ***** | |
| 4 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1 | |
| 5 | * | |
| 6 | * The contents of this file are subject to the Mozilla Public License Version | |
| 7 | * 1.1 (the "License"); you may not use this file except in compliance with | |
| 8 | * the License. You may obtain a copy of the License at | |
| 9 | * http://www.mozilla.org/MPL/ | |
| 10 | * | |
| 11 | * Software distributed under the License is distributed on an "AS IS" basis, | |
| 12 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | |
| 13 | * for the specific language governing rights and limitations under the | |
| 14 | * License. | |
| 15 | * | |
| 16 | * The Original Code is Mozilla Communicator client code, released | |
| 17 | * March 31, 1998. | |
| 18 | * | |
| 19 | * The Initial Developer of the Original Code is | |
| 20 | * Netscape Communications Corporation. | |
| 21 | * Portions created by the Initial Developer are Copyright (C) 1998 | |
| 22 | * the Initial Developer. All Rights Reserved. | |
| 23 | * | |
| 24 | * Contributor(s): | |
| 25 | * IBM Corp. | |
| 26 | * | |
| 27 | * Alternatively, the contents of this file may be used under the terms of | |
| 28 | * either of the GNU General Public License Version 2 or later (the "GPL"), | |
| 29 | * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | |
| 30 | * in which case the provisions of the GPL or the LGPL are applicable instead | |
| 31 | * of those above. If you wish to allow use of your version of this file only | |
| 32 | * under the terms of either the GPL or the LGPL, and not to allow others to | |
| 33 | * use your version of this file under the terms of the MPL, indicate your | |
| 34 | * decision by deleting the provisions above and replace them with the notice | |
| 35 | * and other provisions required by the GPL or the LGPL. If you do not delete | |
| 36 | * the provisions above, a recipient may use your version of this file under | |
| 37 | * the terms of any one of the MPL, the GPL or the LGPL. | |
| 38 | * | |
| 39 | * ***** END LICENSE BLOCK ***** */ | |
| 40 | ||
| 41 | /* | |
| 42 | * JS number type and wrapper class. | |
| 43 | */ | |
| 44 | #include "jsstddef.h" | |
| 45 | #if defined(XP_WIN) || defined(XP_OS2) | |
| 46 | #include <float.h> | |
| 47 | #endif | |
| 48 | #include <math.h> | |
| 49 | #include <stdlib.h> | |
| 50 | #include <string.h> | |
| 51 | #include "jstypes.h" | |
| 52 | #include "jsutil.h" /* Added by JSIFY */ | |
| 53 | #include "jsapi.h" | |
| 54 | #include "jsatom.h" | |
| 55 | #include "jscntxt.h" | |
| 56 | #include "jsconfig.h" | |
| 57 | #include "jsdtoa.h" | |
| 58 | #include "jsgc.h" | |
| 59 | #include "jsinterp.h" | |
| 60 | #include "jsnum.h" | |
| 61 | #include "jsobj.h" | |
| 62 | #include "jsopcode.h" | |
| 63 | #include "jsprf.h" | |
| 64 | #include "jsstr.h" | |
| 65 | ||
| 66 | static JSBool | |
| 67 | num_isNaN(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 68 | 0 | { |
| 69 | 0 | jsdouble x; |
| 70 | ||
| 71 | 0 | if (!js_ValueToNumber(cx, argv[0], &x)) |
| 72 | 0 | return JS_FALSE; |
| 73 | 0 | *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_NaN(x)); |
| 74 | 0 | return JS_TRUE; |
| 75 | } | |
| 76 | ||
| 77 | static JSBool | |
| 78 | num_isFinite(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 79 | 0 | { |
| 80 | 0 | jsdouble x; |
| 81 | ||
| 82 | 0 | if (!js_ValueToNumber(cx, argv[0], &x)) |
| 83 | 0 | return JS_FALSE; |
| 84 | 0 | *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_FINITE(x)); |
| 85 | 0 | return JS_TRUE; |
| 86 | } | |
| 87 | ||
| 88 | static JSBool | |
| 89 | num_parseFloat(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 90 | 0 | { |
| 91 | 0 | JSString *str; |
| 92 | 0 | jsdouble d; |
| 93 | 0 | const jschar *bp, *ep; |
| 94 | ||
| 95 | 0 | str = js_ValueToString(cx, argv[0]); |
| 96 | 0 | if (!str) |
| 97 | 0 | return JS_FALSE; |
| 98 | /* XXXbe js_strtod shouldn't require NUL termination */ | |
| 99 | 0 | bp = js_UndependString(cx, str); |
| 100 | 0 | if (!bp) |
| 101 | 0 | return JS_FALSE; |
| 102 | 0 | if (!js_strtod(cx, bp, &ep, &d)) |
| 103 | 0 | return JS_FALSE; |
| 104 | 0 | if (ep == bp) { |
| 105 | 0 | *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); |
| 106 | 0 | return JS_TRUE; |
| 107 | } | |
| 108 | 0 | return js_NewNumberValue(cx, d, rval); |
| 109 | } | |
| 110 | ||
| 111 | /* See ECMA 15.1.2.2. */ | |
| 112 | static JSBool | |
| 113 | num_parseInt(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 114 | 0 | { |
| 115 | 0 | JSString *str; |
| 116 | 0 | jsint radix; |
| 117 | 0 | jsdouble d; |
| 118 | 0 | const jschar *bp, *ep; |
| 119 | ||
| 120 | 0 | str = js_ValueToString(cx, argv[0]); |
| 121 | 0 | if (!str) |
| 122 | 0 | return JS_FALSE; |
| 123 | ||
| 124 | 0 | if (argc > 1) { |
| 125 | 0 | if (!js_ValueToECMAInt32(cx, argv[1], &radix)) |
| 126 | 0 | return JS_FALSE; |
| 127 | } else | |
| 128 | 0 | radix = 0; |
| 129 | ||
| 130 | 0 | if (radix != 0 && (radix < 2 || radix > 36)) { |
| 131 | 0 | *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); |
| 132 | 0 | return JS_TRUE; |
| 133 | } | |
| 134 | /* XXXbe js_strtointeger shouldn't require NUL termination */ | |
| 135 | 0 | bp = js_UndependString(cx, str); |
| 136 | 0 | if (!bp) |
| 137 | 0 | return JS_FALSE; |
| 138 | 0 | if (!js_strtointeger(cx, bp, &ep, radix, &d)) |
| 139 | 0 | return JS_FALSE; |
| 140 | 0 | if (ep == bp) { |
| 141 | 0 | *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); |
| 142 | 0 | return JS_TRUE; |
| 143 | } | |
| 144 | 0 | return js_NewNumberValue(cx, d, rval); |
| 145 | } | |
| 146 | ||
| 147 | const char js_Infinity_str[] = "Infinity"; | |
| 148 | const char js_NaN_str[] = "NaN"; | |
| 149 | const char js_isNaN_str[] = "isNaN"; | |
| 150 | const char js_isFinite_str[] = "isFinite"; | |
| 151 | const char js_parseFloat_str[] = "parseFloat"; | |
| 152 | const char js_parseInt_str[] = "parseInt"; | |
| 153 | ||
| 154 | static JSFunctionSpec number_functions[] = { | |
| 155 | {"isNaN", num_isNaN, 1,0,0}, | |
| 156 | {"isFinite", num_isFinite, 1,0,0}, | |
| 157 | {"parseFloat", num_parseFloat, 1,0,0}, | |
| 158 | {"parseInt", num_parseInt, 2,0,0}, | |
| 159 | {0,0,0,0,0} | |
| 160 | }; | |
| 161 | ||
| 162 | static JSClass number_class = { | |
| 163 | "Number", | |
| 164 | JSCLASS_HAS_PRIVATE, | |
| 165 | JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, | |
| 166 | JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub, | |
| 167 | JSCLASS_NO_OPTIONAL_MEMBERS | |
| 168 | }; | |
| 169 | ||
| 170 | static JSBool | |
| 171 | Number(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 172 | 0 | { |
| 173 | 0 | jsdouble d; |
| 174 | 0 | jsval v; |
| 175 | ||
| 176 | 0 | if (argc != 0) { |
| 177 | 0 | if (!js_ValueToNumber(cx, argv[0], &d)) |
| 178 | 0 | return JS_FALSE; |
| 179 | } else { | |
| 180 | 0 | d = 0.0; |
| 181 | } | |
| 182 | 0 | if (!js_NewNumberValue(cx, d, &v)) |
| 183 | 0 | return JS_FALSE; |
| 184 | 0 | if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) { |
| 185 | 0 | *rval = v; |
| 186 | 0 | return JS_TRUE; |
| 187 | } | |
| 188 | 0 | OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, v); |
| 189 | 0 | return JS_TRUE; |
| 190 | } | |
| 191 | ||
| 192 | #if JS_HAS_TOSOURCE | |
| 193 | static JSBool | |
| 194 | num_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 195 | 0 | { |
| 196 | 0 | jsval v; |
| 197 | 0 | jsdouble d; |
| 198 | 0 | char numBuf[DTOSTR_STANDARD_BUFFER_SIZE], *numStr; |
| 199 | 0 | char buf[64]; |
| 200 | 0 | JSString *str; |
| 201 | ||
| 202 | 0 | if (!JS_InstanceOf(cx, obj, &number_class, argv)) |
| 203 | 0 | return JS_FALSE; |
| 204 | 0 | v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); |
| 205 | 0 | JS_ASSERT(JSVAL_IS_NUMBER(v)); |
| 206 | 0 | d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); |
| 207 | 0 | numStr = JS_dtostr(numBuf, sizeof numBuf, DTOSTR_STANDARD, 0, d); |
| 208 | 0 | if (!numStr) { |
| 209 | 0 | JS_ReportOutOfMemory(cx); |
| 210 | 0 | return JS_FALSE; |
| 211 | } | |
| 212 | 0 | JS_snprintf(buf, sizeof buf, "(new %s(%s))", number_class.name, numStr); |
| 213 | 0 | str = JS_NewStringCopyZ(cx, buf); |
| 214 | 0 | if (!str) |
| 215 | 0 | return JS_FALSE; |
| 216 | 0 | *rval = STRING_TO_JSVAL(str); |
| 217 | 0 | return JS_TRUE; |
| 218 | } | |
| 219 | #endif | |
| 220 | ||
| 221 | /* The buf must be big enough for MIN_INT to fit including '-' and '\0'. */ | |
| 222 | static char * | |
| 223 | IntToString(jsint i, char *buf, size_t bufSize) | |
| 224 | 0 | { |
| 225 | 0 | char *cp; |
| 226 | 0 | jsuint u; |
| 227 | ||
| 228 | 0 | u = (i < 0) ? -i : i; |
| 229 | ||
| 230 | 0 | cp = buf + bufSize; /* one past last buffer cell */ |
| 231 | 0 | *--cp = '\0'; /* null terminate the string to be */ |
| 232 | ||
| 233 | /* | |
| 234 | * Build the string from behind. We use multiply and subtraction | |
| 235 | * instead of modulus because that's much faster. | |
| 236 | */ | |
| 237 | 0 | do { |
| 238 | 0 | jsuint newu = u / 10; |
| 239 | 0 | *--cp = (char)(u - newu * 10) + '0'; |
| 240 | 0 | u = newu; |
| 241 | 0 | } while (u != 0); |
| 242 | ||
| 243 | 0 | if (i < 0) |
| 244 | 0 | *--cp = '-'; |
| 245 | ||
| 246 | 0 | return cp; |
| 247 | } | |
| 248 | ||
| 249 | static JSBool | |
| 250 | num_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 251 | 0 | { |
| 252 | 0 | jsval v; |
| 253 | 0 | jsdouble d; |
| 254 | 0 | jsint base; |
| 255 | 0 | JSString *str; |
| 256 | ||
| 257 | 0 | if (!JS_InstanceOf(cx, obj, &number_class, argv)) |
| 258 | 0 | return JS_FALSE; |
| 259 | 0 | v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); |
| 260 | 0 | JS_ASSERT(JSVAL_IS_NUMBER(v)); |
| 261 | 0 | d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); |
| 262 | 0 | base = 10; |
| 263 | 0 | if (argc != 0) { |
| 264 | 0 | if (!js_ValueToECMAInt32(cx, argv[0], &base)) |
| 265 | 0 | return JS_FALSE; |
| 266 | 0 | if (base < 2 || base > 36) { |
| 267 | 0 | char numBuf[12]; |
| 268 | 0 | char *numStr = IntToString(base, numBuf, sizeof numBuf); |
| 269 | 0 | JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_RADIX, |
| 270 | numStr); | |
| 271 | 0 | return JS_FALSE; |
| 272 | } | |
| 273 | } | |
| 274 | 0 | if (base == 10) |
| 275 | 0 | str = js_NumberToString(cx, d); |
| 276 | else { | |
| 277 | 0 | char *dStr = JS_dtobasestr(base, d); |
| 278 | 0 | if (!dStr) { |
| 279 | 0 | JS_ReportOutOfMemory(cx); |
| 280 | 0 | return JS_FALSE; |
| 281 | } | |
| 282 | 0 | str = JS_NewStringCopyZ(cx, dStr); |
| 283 | 0 | free(dStr); |
| 284 | } | |
| 285 | 0 | if (!str) |
| 286 | 0 | return JS_FALSE; |
| 287 | 0 | *rval = STRING_TO_JSVAL(str); |
| 288 | 0 | return JS_TRUE; |
| 289 | } | |
| 290 | ||
| 291 | static JSBool | |
| 292 | num_toLocaleString(JSContext *cx, JSObject *obj, uintN argc, | |
| 293 | jsval *argv, jsval *rval) | |
| 294 | 0 | { |
| 295 | /* | |
| 296 | * For now, forcibly ignore the first (or any) argument and return toString(). | |
| 297 | * ECMA allows this, although it doesn't 'encourage it'. | |
| 298 | * [The first argument is being reserved by ECMA and we don't want it confused | |
| 299 | * with a radix] | |
| 300 | */ | |
| 301 | 0 | return num_toString(cx, obj, 0, argv, rval); |
| 302 | } | |
| 303 | ||
| 304 | static JSBool | |
| 305 | num_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 306 | 0 | { |
| 307 | 0 | if (!JS_InstanceOf(cx, obj, &number_class, argv)) |
| 308 | 0 | return JS_FALSE; |
| 309 | 0 | *rval = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); |
| 310 | 0 | return JS_TRUE; |
| 311 | } | |
| 312 | ||
| 313 | ||
| 314 | #if JS_HAS_NUMBER_FORMATS | |
| 315 | #define MAX_PRECISION 100 | |
| 316 | ||
| 317 | static JSBool | |
| 318 | num_to(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval, JSDToStrMode zeroArgMode, | |
| 319 | JSDToStrMode oneArgMode, jsint precisionMin, jsint precisionMax, jsint precisionOffset) | |
| 320 | 0 | { |
| 321 | 0 | jsval v; |
| 322 | 0 | jsdouble d, precision; |
| 323 | 0 | JSString *str; |
| 324 | 0 | char buf[DTOSTR_VARIABLE_BUFFER_SIZE(MAX_PRECISION+1)], *numStr; /* Use MAX_PRECISION+1 because precisionOffset can be 1 */ |
| 325 | ||
| 326 | 0 | if (!JS_InstanceOf(cx, obj, &number_class, argv)) |
| 327 | 0 | return JS_FALSE; |
| 328 | 0 | v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); |
| 329 | 0 | JS_ASSERT(JSVAL_IS_NUMBER(v)); |
| 330 | 0 | d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); |
| 331 | ||
| 332 | 0 | if (JSVAL_IS_VOID(argv[0])) { |
| 333 | 0 | precision = 0.0; |
| 334 | 0 | oneArgMode = zeroArgMode; |
| 335 | } else { | |
| 336 | 0 | if (!js_ValueToNumber(cx, argv[0], &precision)) |
| 337 | 0 | return JS_FALSE; |
| 338 | 0 | precision = js_DoubleToInteger(precision); |
| 339 | 0 | if (precision < precisionMin || precision > precisionMax) { |
| 340 | 0 | numStr = JS_dtostr(buf, sizeof buf, DTOSTR_STANDARD, 0, precision); |
| 341 | 0 | if (!numStr) |
| 342 | 0 | JS_ReportOutOfMemory(cx); |
| 343 | else | |
| 344 | 0 | JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_PRECISION_RANGE, numStr); |
| 345 | 0 | return JS_FALSE; |
| 346 | } | |
| 347 | } | |
| 348 | ||
| 349 | 0 | numStr = JS_dtostr(buf, sizeof buf, oneArgMode, (jsint)precision + precisionOffset, d); |
| 350 | 0 | if (!numStr) { |
| 351 | 0 | JS_ReportOutOfMemory(cx); |
| 352 | 0 | return JS_FALSE; |
| 353 | } | |
| 354 | 0 | str = JS_NewStringCopyZ(cx, numStr); |
| 355 | 0 | if (!str) |
| 356 | 0 | return JS_FALSE; |
| 357 | 0 | *rval = STRING_TO_JSVAL(str); |
| 358 | 0 | return JS_TRUE; |
| 359 | } | |
| 360 | ||
| 361 | static JSBool | |
| 362 | num_toFixed(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 363 | 0 | { |
| 364 | /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ | |
| 365 | 0 | return num_to(cx, obj, argc, argv, rval, DTOSTR_FIXED, DTOSTR_FIXED, -20, MAX_PRECISION, 0); |
| 366 | } | |
| 367 | ||
| 368 | static JSBool | |
| 369 | num_toExponential(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 370 | 0 | { |
| 371 | /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ | |
| 372 | 0 | return num_to(cx, obj, argc, argv, rval, DTOSTR_STANDARD_EXPONENTIAL, DTOSTR_EXPONENTIAL, 0, MAX_PRECISION, 1); |
| 373 | } | |
| 374 | ||
| 375 | static JSBool | |
| 376 | num_toPrecision(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) | |
| 377 | 0 | { |
| 378 | /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ | |
| 379 | 0 | return num_to(cx, obj, argc, argv, rval, DTOSTR_STANDARD, DTOSTR_PRECISION, 1, MAX_PRECISION, 0); |
| 380 | } | |
| 381 | #endif /* JS_HAS_NUMBER_FORMATS */ | |
| 382 | ||
| 383 | ||
| 384 | static JSFunctionSpec number_methods[] = { | |
| 385 | #if JS_HAS_TOSOURCE | |
| 386 | {js_toSource_str, num_toSource, 0,0,0}, | |
| 387 | #endif | |
| 388 | {js_toString_str, num_toString, 0,0,0}, | |
| 389 | {js_toLocaleString_str, num_toLocaleString, 0,0,0}, | |
| 390 | {js_valueOf_str, num_valueOf, 0,0,0}, | |
| 391 | #if JS_HAS_NUMBER_FORMATS | |
| 392 | {"toFixed", num_toFixed, 1,0,0}, | |
| 393 | {"toExponential", num_toExponential, 1,0,0}, | |
| 394 | {"toPrecision", num_toPrecision, 1,0,0}, | |
| 395 | #endif | |
| 396 | {0,0,0,0,0} | |
| 397 | }; | |
| 398 | ||
| 399 | /* NB: Keep this in synch with number_constants[]. */ | |
| 400 | enum nc_slot { | |
| 401 | NC_NaN, | |
| 402 | NC_POSITIVE_INFINITY, | |
| 403 | NC_NEGATIVE_INFINITY, | |
| 404 | NC_MAX_VALUE, | |
| 405 | NC_MIN_VALUE, | |
| 406 | NC_LIMIT | |
| 407 | }; | |
| 408 | ||
| 409 | /* | |
| 410 | * Some to most C compilers forbid spelling these at compile time, or barf | |
| 411 | * if you try, so all but MAX_VALUE are set up by js_InitRuntimeNumberState | |
| 412 | * using union jsdpun. | |
| 413 | */ | |
| 414 | static JSConstDoubleSpec number_constants[] = { | |
| 415 | {0, js_NaN_str, 0,{0,0,0}}, | |
| 416 | {0, "POSITIVE_INFINITY", 0,{0,0,0}}, | |
| 417 | {0, "NEGATIVE_INFINITY", 0,{0,0,0}}, | |
| 418 | {1.7976931348623157E+308, "MAX_VALUE", 0,{0,0,0}}, | |
| 419 | {0, "MIN_VALUE", 0,{0,0,0}}, | |
| 420 | {0,0,0,{0,0,0}} | |
| 421 | }; | |
| 422 | ||
| 423 | static jsdouble NaN; | |
| 424 | ||
| 425 | ||
| 426 | #if defined XP_WIN && \ | |
| 427 | !defined __MWERKS__ && \ | |
| 428 | (defined _M_IX86 || \ | |
| 429 | (defined __GNUC__ && !defined __MINGW32__)) | |
| 430 | ||
| 431 | /* | |
| 432 | * Set the exception mask to mask all exceptions and set the FPU precision | |
| 433 | * to 53 bit mantissa. | |
| 434 | * On Alpha platform this is handled via Compiler option. | |
| 435 | */ | |
| 436 | #define FIX_FPU() _control87(MCW_EM | PC_53, MCW_EM | MCW_PC) | |
| 437 | ||
| 438 | #else | |
| 439 | ||
| 440 | #define FIX_FPU() ((void)0) | |
| 441 | ||
| 442 | #endif | |
| 443 | ||
| 444 | JSBool | |
| 445 | js_InitRuntimeNumberState(JSContext *cx) | |
| 446 | 0 | { |
| 447 | 0 | JSRuntime *rt; |
| 448 | 0 | jsdpun u; |
| 449 | ||
| 450 | 0 | rt = cx->runtime; |
| 451 | 0 | JS_ASSERT(!rt->jsNaN); |
| 452 | ||
| 453 | 0 | FIX_FPU(); |
| 454 | ||
| 455 | 0 | u.s.hi = JSDOUBLE_HI32_EXPMASK | JSDOUBLE_HI32_MANTMASK; |
| 456 | 0 | u.s.lo = 0xffffffff; |
| 457 | 0 | number_constants[NC_NaN].dval = NaN = u.d; |
| 458 | 0 | rt->jsNaN = js_NewDouble(cx, NaN); |
| 459 | 0 | if (!rt->jsNaN || !js_LockGCThing(cx, rt->jsNaN)) |
| 460 | 0 | return JS_FALSE; |
| 461 | ||
| 462 | 0 | u.s.hi = JSDOUBLE_HI32_EXPMASK; |
| 463 | 0 | u.s.lo = 0x00000000; |
| 464 | 0 | number_constants[NC_POSITIVE_INFINITY].dval = u.d; |
| 465 | 0 | rt->jsPositiveInfinity = js_NewDouble(cx, u.d); |
| 466 | 0 | if (!rt->jsPositiveInfinity || |
| 467 | !js_LockGCThing(cx, rt->jsPositiveInfinity)) { | |
| 468 | 0 | return JS_FALSE; |
| 469 | } | |
| 470 | ||
| 471 | 0 | u.s.hi = JSDOUBLE_HI32_SIGNBIT | JSDOUBLE_HI32_EXPMASK; |
| 472 | 0 | u.s.lo = 0x00000000; |
| 473 | 0 | number_constants[NC_NEGATIVE_INFINITY].dval = u.d; |
| 474 | 0 | rt->jsNegativeInfinity = js_NewDouble(cx, u.d); |
| 475 | 0 | if (!rt->jsNegativeInfinity || |
| 476 | !js_LockGCThing(cx, rt->jsNegativeInfinity)) { | |
| 477 | 0 | return JS_FALSE; |
| 478 | } | |
| 479 | ||
| 480 | 0 | u.s.hi = 0; |
| 481 | 0 | u.s.lo = 1; |
| 482 | 0 | number_constants[NC_MIN_VALUE].dval = u.d; |
| 483 | ||
| 484 | 0 | return JS_TRUE; |
| 485 | } | |
| 486 | ||
| 487 | void | |
| 488 | js_FinishRuntimeNumberState(JSContext *cx) | |
| 489 | 0 | { |
| 490 | 0 | JSRuntime *rt = cx->runtime; |
| 491 | ||
| 492 | 0 | js_UnlockGCThingRT(rt, rt->jsNaN); |
| 493 | 0 | js_UnlockGCThingRT(rt, rt->jsNegativeInfinity); |
| 494 | 0 | js_UnlockGCThingRT(rt, rt->jsPositiveInfinity); |
| 495 | ||
| 496 | 0 | rt->jsNaN = NULL; |
| 497 | 0 | rt->jsNegativeInfinity = NULL; |
| 498 | 0 | rt->jsPositiveInfinity = NULL; |
| 499 | } | |
| 500 | ||
| 501 | JSObject * | |
| 502 | js_InitNumberClass(JSContext *cx, JSObject *obj) | |
| 503 | 0 | { |
| 504 | 0 | JSObject *proto, *ctor; |
| 505 | 0 | JSRuntime *rt; |
| 506 | ||
| 507 | /* XXX must do at least once per new thread, so do it per JSContext... */ | |
| 508 | 0 | FIX_FPU(); |
| 509 | ||
| 510 | 0 | if (!JS_DefineFunctions(cx, obj, number_functions)) |
| 511 | 0 | return NULL; |
| 512 | ||
| 513 | 0 | proto = JS_InitClass(cx, obj, NULL, &number_class, Number, 1, |
| 514 | NULL, number_methods, NULL, NULL); | |
| 515 | 0 | if (!proto || !(ctor = JS_GetConstructor(cx, proto))) |
| 516 | 0 | return NULL; |
| 517 | 0 | OBJ_SET_SLOT(cx, proto, JSSLOT_PRIVATE, JSVAL_ZERO); |
| 518 | 0 | if (!JS_DefineConstDoubles(cx, ctor, number_constants)) |
| 519 | 0 | return NULL; |
| 520 | ||
| 521 | /* ECMA 15.1.1.1 */ | |
| 522 | 0 | rt = cx->runtime; |
| 523 | 0 | if (!JS_DefineProperty(cx, obj, js_NaN_str, DOUBLE_TO_JSVAL(rt->jsNaN), |
| 524 | NULL, NULL, JSPROP_PERMANENT)) { | |
| 525 | 0 | return NULL; |
| 526 | } | |
| 527 | ||
| 528 | /* ECMA 15.1.1.2 */ | |
| 529 | 0 | if (!JS_DefineProperty(cx, obj, js_Infinity_str, |
| 530 | DOUBLE_TO_JSVAL(rt->jsPositiveInfinity), | |
| 531 | NULL, NULL, JSPROP_PERMANENT)) { | |
| 532 | 0 | return NULL; |
| 533 | } | |
| 534 | 0 | return proto; |
| 535 | } | |
| 536 | ||
| 537 | jsdouble * | |
| 538 | js_NewDouble(JSContext *cx, jsdouble d) | |
| 539 | 0 | { |
| 540 | 0 | jsdouble *dp; |
| 541 | ||
| 542 | 0 | dp = (jsdouble *) js_AllocGCThing(cx, GCX_DOUBLE); |
| 543 | 0 | if (!dp) |
| 544 | 0 | return NULL; |
| 545 | 0 | *dp = d; |
| 546 | 0 | return dp; |
| 547 | } | |
| 548 | ||
| 549 | void | |
| 550 | js_FinalizeDouble(JSContext *cx, jsdouble *dp) | |
| 551 | 0 | { |
| 552 | 0 | *dp = NaN; |
| 553 | } | |
| 554 | ||
| 555 | JSBool | |
| 556 | js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval) | |
| 557 | 0 | { |
| 558 | 0 | jsdouble *dp; |
| 559 | ||
| 560 | 0 | dp = js_NewDouble(cx, d); |
| 561 | 0 | if (!dp) |
| 562 | 0 | return JS_FALSE; |
| 563 | 0 | *rval = DOUBLE_TO_JSVAL(dp); |
| 564 | 0 | return JS_TRUE; |
| 565 | } | |
| 566 | ||
| 567 | JSBool | |
| 568 | js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval) | |
| 569 | 0 | { |
| 570 | 0 | jsint i; |
| 571 | 0 | JSBool ok; |
| 572 | ||
| 573 | 0 | SET_FPU(); |
| 574 | ||
| 575 | 0 | if (JSDOUBLE_IS_INT(d, i) && INT_FITS_IN_JSVAL(i)) { |
| 576 | 0 | *rval = INT_TO_JSVAL(i); |
| 577 | 0 | ok = JS_TRUE; |
| 578 | } else { | |
| 579 | 0 | ok = js_NewDoubleValue(cx, d, rval); |
| 580 | } | |
| 581 | ||
| 582 | 0 | RESTORE_FPU(); |
| 583 | 0 | return ok; |
| 584 | } | |
| 585 | ||
| 586 | JSObject * | |
| 587 | js_NumberToObject(JSContext *cx, jsdouble d) | |
| 588 | 0 | { |
| 589 | 0 | JSObject *obj; |
| 590 | 0 | jsval v; |
| 591 | ||
| 592 | 0 | obj = js_NewObject(cx, &number_class, NULL, NULL); |
| 593 | 0 | if (!obj) |
| 594 | 0 | return NULL; |
| 595 | 0 | if (!js_NewNumberValue(cx, d, &v)) { |
| 596 | 0 | cx->newborn[GCX_OBJECT] = NULL; |
| 597 | 0 | return NULL; |
| 598 | } | |
| 599 | 0 | OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, v); |
| 600 | 0 | return obj; |
| 601 | } | |
| 602 | ||
| 603 | JSString * | |
| 604 | js_NumberToString(JSContext *cx, jsdouble d) | |
| 605 | 0 | { |
| 606 | 0 | jsint i; |
| 607 | 0 | char buf[DTOSTR_STANDARD_BUFFER_SIZE]; |
| 608 | 0 | char *numStr; |
| 609 | ||
| 610 | 0 | if (JSDOUBLE_IS_INT(d, i)) |
| 611 | 0 | numStr = IntToString(i, buf, sizeof buf); |
| 612 | else { | |
| 613 | 0 | numStr = JS_dtostr(buf, sizeof buf, DTOSTR_STANDARD, 0, d); |
| 614 | 0 | if (!numStr) { |
| 615 | 0 | JS_ReportOutOfMemory(cx); |
| 616 | 0 | return NULL; |
| 617 | } | |
| 618 | } | |
| 619 | 0 | return JS_NewStringCopyZ(cx, numStr); |
| 620 | } | |
| 621 | ||
| 622 | JSBool | |
| 623 | js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp) | |
| 624 | 0 | { |
| 625 | 0 | JSObject *obj; |
| 626 | 0 | JSString *str; |
| 627 | 0 | const jschar *bp, *ep; |
| 628 | ||
| 629 | 0 | if (JSVAL_IS_OBJECT(v)) { |
| 630 | 0 | obj = JSVAL_TO_OBJECT(v); |
| 631 | 0 | if (!obj) { |
| 632 | 0 | *dp = 0; |
| 633 | 0 | return JS_TRUE; |
| 634 | } | |
| 635 | 0 | if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_NUMBER, &v)) |
| 636 | 0 | return JS_FALSE; |
| 637 | } | |
| 638 | 0 | if (JSVAL_IS_INT(v)) { |
| 639 | 0 | *dp = (jsdouble)JSVAL_TO_INT(v); |
| 640 | 0 | } else if (JSVAL_IS_DOUBLE(v)) { |
| 641 | 0 | *dp = *JSVAL_TO_DOUBLE(v); |
| 642 | 0 | } else if (JSVAL_IS_STRING(v)) { |
| 643 | 0 | str = JSVAL_TO_STRING(v); |
| 644 | /* | |
| 645 | * Note that ECMA doesn't treat a string beginning with a '0' as an | |
| 646 | * octal number here. This works because all such numbers will be | |
| 647 | * interpreted as decimal by js_strtod and will never get passed to | |
| 648 | * js_strtointeger (which would interpret them as octal). | |
| 649 | */ | |
| 650 | /* XXXbe js_strtod shouldn't require NUL termination */ | |
| 651 | 0 | bp = js_UndependString(cx, str); |
| 652 | 0 | if (!bp) |
| 653 | 0 | return JS_FALSE; |
| 654 | 0 | if ((!js_strtod(cx, bp, &ep, dp) || |
| 655 | js_SkipWhiteSpace(ep) != bp + str->length) && | |
| 656 | (!js_strtointeger(cx, bp, &ep, 0, dp) || | |
| 657 | js_SkipWhiteSpace(ep) != bp + str->length)) { | |
| 658 | 0 | goto badstr; |
| 659 | } | |
| 660 | 0 | } else if (JSVAL_IS_BOOLEAN(v)) { |
| 661 | 0 | *dp = JSVAL_TO_BOOLEAN(v) ? 1 : 0; |
| 662 | } else { | |
| 663 | #if JS_BUG_FALLIBLE_TONUM | |
| 664 | str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL); | |
| 665 | badstr: | |
| 666 | if (str) { | |
| 667 | JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NAN, | |
| 668 | JS_GetStringBytes(str)); | |
| 669 | ||
| 670 | } | |
| 671 | return JS_FALSE; | |
| 672 | #else | |
| 673 | badstr: | |
| 674 | 0 | *dp = *cx->runtime->jsNaN; |
| 675 | #endif | |
| 676 | } | |
| 677 | 0 | return JS_TRUE; |
| 678 | } | |
| 679 | ||
| 680 | JSBool | |
| 681 | js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip) | |
| 682 | 0 | { |
| 683 | 0 | jsdouble d; |
| 684 | ||
| 685 | 0 | if (!js_ValueToNumber(cx, v, &d)) |
| 686 | 0 | return JS_FALSE; |
| 687 | 0 | return js_DoubleToECMAInt32(cx, d, ip); |
| 688 | } | |
| 689 | ||
| 690 | JSBool | |
| 691 | js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip) | |
| 692 | 0 | { |
| 693 | 0 | jsdouble two32 = 4294967296.0; |
| 694 | 0 | jsdouble two31 = 2147483648.0; |
| 695 | ||
| 696 | 0 | if (!JSDOUBLE_IS_FINITE(d) || d == 0) { |
| 697 | 0 | *ip = 0; |
| 698 | 0 | return JS_TRUE; |
| 699 | } | |
| 700 | 0 | d = fmod(d, two32); |
| 701 | 0 | d = (d >= 0) ? floor(d) : ceil(d) + two32; |
| 702 | 0 | if (d >= two31) |
| 703 | 0 | *ip = (int32)(d - two32); |
| 704 | else | |
| 705 | 0 | *ip = (int32)d; |
| 706 | 0 | return JS_TRUE; |
| 707 | } | |
| 708 | ||
| 709 | JSBool | |
| 710 | js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip) | |
| 711 | 0 | { |
| 712 | 0 | jsdouble d; |
| 713 | ||
| 714 | 0 | if (!js_ValueToNumber(cx, v, &d)) |
| 715 | 0 | return JS_FALSE; |
| 716 | 0 | return js_DoubleToECMAUint32(cx, d, ip); |
| 717 | } | |
| 718 | ||
| 719 | JSBool | |
| 720 | js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip) | |
| 721 | 0 | { |
| 722 | 0 | JSBool neg; |
| 723 | 0 | jsdouble two32 = 4294967296.0; |
| 724 | ||
| 725 | 0 | if (!JSDOUBLE_IS_FINITE(d) || d == 0) { |
| 726 | 0 | *ip = 0; |
| 727 | 0 | return JS_TRUE; |
| 728 | } | |
| 729 | ||
| 730 | 0 | neg = (d < 0); |
| 731 | 0 | d = floor(neg ? -d : d); |
| 732 | 0 | d = neg ? -d : d; |
| 733 | ||
| 734 | 0 | d = fmod(d, two32); |
| 735 | ||
| 736 | 0 | d = (d >= 0) ? d : d + two32; |
| 737 | 0 | *ip = (uint32)d; |
| 738 | 0 | return JS_TRUE; |
| 739 | } | |
| 740 | ||
| 741 | JSBool | |
| 742 | js_ValueToInt32(JSContext *cx, jsval v, int32 *ip) | |
| 743 | 0 | { |
| 744 | 0 | jsdouble d; |
| 745 | 0 | JSString *str; |
| 746 | ||
| 747 | 0 | if (JSVAL_IS_INT(v)) { |
| 748 | 0 | *ip = JSVAL_TO_INT(v); |
| 749 | 0 | return JS_TRUE; |
| 750 | } | |
| 751 | 0 | if (!js_ValueToNumber(cx, v, &d)) |
| 752 | 0 | return JS_FALSE; |
| 753 | 0 | if (JSDOUBLE_IS_NaN(d) || d <= -2147483649.0 || 2147483648.0 <= d) { |
| 754 | 0 | str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL); |
| 755 | 0 | if (str) { |
| 756 | 0 | JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, |
| 757 | JSMSG_CANT_CONVERT, JS_GetStringBytes(str)); | |
| 758 | ||
| 759 | } | |
| 760 | 0 | return JS_FALSE; |
| 761 | } | |
| 762 | 0 | *ip = (int32)floor(d + 0.5); /* Round to nearest */ |
| 763 | 0 | return JS_TRUE; |
| 764 | } | |
| 765 | ||
| 766 | JSBool | |
| 767 | js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip) | |
| 768 | 0 | { |
| 769 | 0 | jsdouble d; |
| 770 | 0 | jsuint i, m; |
| 771 | 0 | JSBool neg; |
| 772 | ||
| 773 | 0 | if (!js_ValueToNumber(cx, v, &d)) |
| 774 | 0 | return JS_FALSE; |
| 775 | 0 | if (d == 0 || !JSDOUBLE_IS_FINITE(d)) { |
| 776 | 0 | *ip = 0; |
| 777 | 0 | return JS_TRUE; |
| 778 | } | |
| 779 | 0 | i = (jsuint)d; |
| 780 | 0 | if ((jsdouble)i == d) { |
| 781 | 0 | *ip = (uint16)i; |
| 782 | 0 | return JS_TRUE; |
| 783 | } | |
| 784 | 0 | neg = (d < 0); |
| 785 | 0 | d = floor(neg ? -d : d); |
| 786 | 0 | d = neg ? -d : d; |
| 787 | 0 | m = JS_BIT(16); |
| 788 | 0 | d = fmod(d, (double)m); |
| 789 | 0 | if (d < 0) |
| 790 | 0 | d += m; |
| 791 | 0 | *ip = (uint16) d; |
| 792 | 0 | return JS_TRUE; |
| 793 | } | |
| 794 | ||
| 795 | jsdouble | |
| 796 | js_DoubleToInteger(jsdouble d) | |
| 797 | 0 | { |
| 798 | 0 | JSBool neg; |
| 799 | ||
| 800 | 0 | if (d == 0) |
| 801 | 0 | return d; |
| 802 | 0 | if (!JSDOUBLE_IS_FINITE(d)) { |
| 803 | 0 | if (JSDOUBLE_IS_NaN(d)) |
| 804 | 0 | return 0; |
| 805 | 0 | return d; |
| 806 | } | |
| 807 | 0 | neg = (d < 0); |
| 808 | 0 | d = floor(neg ? -d : d); |
| 809 | 0 | return neg ? -d : d; |
| 810 | } | |
| 811 | ||
| 812 | ||
| 813 | JSBool | |
| 814 | js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp) | |
| 815 | 0 | { |
| 816 | 0 | char cbuf[32]; |
| 817 | 0 | size_t i; |
| 818 | 0 | char *cstr, *istr, *estr; |
| 819 | 0 | JSBool negative; |
| 820 | 0 | jsdouble d; |
| 821 | 0 | const jschar *s1 = js_SkipWhiteSpace(s); |
| 822 | 0 | size_t length = js_strlen(s1); |
| 823 | ||
| 824 | /* Use cbuf to avoid malloc */ | |
| 825 | 0 | if (length >= sizeof cbuf) { |
| 826 | 0 | cstr = (char *) JS_malloc(cx, length + 1); |
| 827 | 0 | if (!cstr) |
| 828 | 0 | return JS_FALSE; |
| 829 | } else { | |
| 830 | 0 | cstr = cbuf; |
| 831 | } | |
| 832 | ||
| 833 | 0 | for (i = 0; i <= length; i++) { |
| 834 | 0 | if (s1[i] >> 8) { |
| 835 | 0 | cstr[i] = 0; |
| 836 | 0 | break; |
| 837 | } | |
| 838 | 0 | cstr[i] = (char)s1[i]; |
| 839 | } | |
| 840 | ||
| 841 | 0 | istr = cstr; |
| 842 | 0 | if ((negative = (*istr == '-')) != 0 || *istr == '+') |
| 843 | 0 | istr++; |
| 844 | 0 | if (!strncmp(istr, js_Infinity_str, sizeof js_Infinity_str - 1)) { |
| 845 | 0 | d = *(negative ? cx->runtime->jsNegativeInfinity : cx->runtime->jsPositiveInfinity); |
| 846 | 0 | estr = istr + 8; |
| 847 | } else { | |
| 848 | 0 | int err; |
| 849 | 0 | d = JS_strtod(cstr, &estr, &err); |
| 850 | 0 | if (err == JS_DTOA_ENOMEM) { |
| 851 | 0 | JS_ReportOutOfMemory(cx); |
| 852 | 0 | if (cstr != cbuf) |
| 853 | 0 | JS_free(cx, cstr); |
| 854 | 0 | return JS_FALSE; |
| 855 | } | |
| 856 | 0 | if (err == JS_DTOA_ERANGE) { |
| 857 | 0 | if (d == HUGE_VAL) |
| 858 | 0 | d = *cx->runtime->jsPositiveInfinity; |
| 859 | 0 | else if (d == -HUGE_VAL) |
| 860 | 0 | d = *cx->runtime->jsNegativeInfinity; |
| 861 | } | |
| 862 | #ifdef HPUX | |
| 863 | if (d == 0.0 && negative) { | |
| 864 | /* | |
| 865 | * "-0", "-1e-2000" come out as positive zero | |
| 866 | * here on HPUX. Force a negative zero instead. | |
| 867 | */ | |
| 868 | JSDOUBLE_HI32(d) = JSDOUBLE_HI32_SIGNBIT; | |
| 869 | JSDOUBLE_LO32(d) = 0; | |
| 870 | } | |
| 871 | #endif | |
| 872 | } | |
| 873 | ||
| 874 | 0 | i = estr - cstr; |
| 875 | 0 | if (cstr != cbuf) |
| 876 | 0 | JS_free(cx, cstr); |
| 877 | 0 | *ep = i ? s1 + i : s; |
| 878 | 0 | *dp = d; |
| 879 | 0 | return JS_TRUE; |
| 880 | } | |
| 881 | ||
| 882 | struct BinaryDigitReader | |
| 883 | { | |
| 884 | uintN base; /* Base of number; must be a power of 2 */ | |
| 885 | uintN digit; /* Current digit value in radix given by base */ | |
| 886 | uintN digitMask; /* Mask to extract the next bit from digit */ | |
| 887 | const jschar *digits; /* Pointer to the remaining digits */ | |
| 888 | const jschar *end; /* Pointer to first non-digit */ | |
| 889 | }; | |
| 890 | ||
| 891 | /* Return the next binary digit from the number or -1 if done */ | |
| 892 | static intN GetNextBinaryDigit(struct BinaryDigitReader *bdr) | |
| 893 | 0 | { |
| 894 | 0 | intN bit; |
| 895 | ||
| 896 | 0 | if (bdr->digitMask == 0) { |
| 897 | 0 | uintN c; |
| 898 | ||
| 899 | 0 | if (bdr->digits == bdr->end) |
| 900 | 0 | return -1; |
| 901 | ||
| 902 | 0 | c = *bdr->digits++; |
| 903 | 0 | if ('0' <= c && c <= '9') |
| 904 | 0 | bdr->digit = c - '0'; |
| 905 | 0 | else if ('a' <= c && c <= 'z') |
| 906 | 0 | bdr->digit = c - 'a' + 10; |
| 907 | 0 | else bdr->digit = c - 'A' + 10; |
| 908 | 0 | bdr->digitMask = bdr->base >> 1; |
| 909 | } | |
| 910 | 0 | bit = (bdr->digit & bdr->digitMask) != 0; |
| 911 | 0 | bdr->digitMask >>= 1; |
| 912 | 0 | return bit; |
| 913 | } | |
| 914 | ||
| 915 | JSBool | |
| 916 | js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint base, jsdouble *dp) | |
| 917 | 0 | { |
| 918 | 0 | JSBool negative; |
| 919 | 0 | jsdouble value; |
| 920 | 0 | const jschar *start; |
| 921 | 0 | const jschar *s1 = js_SkipWhiteSpace(s); |
| 922 | ||
| 923 | 0 | if ((negative = (*s1 == '-')) != 0 || *s1 == '+') |
| 924 | 0 | s1++; |
| 925 | ||
| 926 | 0 | if (base == 0) { |
| 927 | /* No base supplied, or some base that evaluated to 0. */ | |
| 928 | 0 | if (*s1 == '0') { |
| 929 | /* It's either hex or octal; only increment char if str isn't '0' */ | |
| 930 | 0 | if (s1[1] == 'X' || s1[1] == 'x') { /* Hex */ |
| 931 | 0 | s1 += 2; |
| 932 | 0 | base = 16; |
| 933 | } else { /* Octal */ | |
| 934 | 0 | base = 8; |
| 935 | } | |
| 936 | } else { | |
| 937 | 0 | base = 10; /* Default to decimal. */ |
| 938 | } | |
| 939 | 0 | } else if (base == 16 && *s1 == '0' && (s1[1] == 'X' || s1[1] == 'x')) { |
| 940 | /* If base is 16, ignore hex prefix. */ | |
| 941 | 0 | s1 += 2; |
| 942 | } | |
| 943 | ||
| 944 | /* | |
| 945 | * Done with the preliminaries; find some prefix of the string that's | |
| 946 | * a number in the given base. | |
| 947 | */ | |
| 948 | 0 | start = s1; /* Mark - if string is empty, we return NaN. */ |
| 949 | 0 | value = 0.0; |
| 950 | 0 | for (;;) { |
| 951 | 0 | uintN digit; |
| 952 | 0 | jschar c = *s1; |
| 953 | 0 | if ('0' <= c && c <= '9') |
| 954 | 0 | digit = c - '0'; |
| 955 | 0 | else if ('a' <= c && c <= 'z') |
| 956 | 0 | digit = c - 'a' + 10; |
| 957 | 0 | else if ('A' <= c && c <= 'Z') |
| 958 | 0 | digit = c - 'A' + 10; |
| 959 | else | |
| 960 | 0 | break; |
| 961 | 0 | if (digit >= (uintN)base) |
| 962 | 0 | break; |
| 963 | 0 | value = value * base + digit; |
| 964 | 0 | s1++; |
| 965 | } | |
| 966 | ||
| 967 | 0 | if (value >= 9007199254740992.0) { |
| 968 | 0 | if (base == 10) { |
| 969 | /* | |
| 970 | * If we're accumulating a decimal number and the number is >= | |
| 971 | * 2^53, then the result from the repeated multiply-add above may | |
| 972 | * be inaccurate. Call JS_strtod to get the correct answer. | |
| 973 | */ | |
| 974 | 0 | size_t i; |
| 975 | 0 | size_t length = s1 - start; |
| 976 | 0 | char *cstr = (char *) JS_malloc(cx, length + 1); |
| 977 | 0 | char *estr; |
| 978 | 0 | int err=0; |
| 979 | ||
| 980 | 0 | if (!cstr) |
| 981 | 0 | return JS_FALSE; |
| 982 | 0 | for (i = 0; i != length; i++) |
| 983 | 0 | cstr[i] = (char)start[i]; |
| 984 | 0 | cstr[length] = 0; |
| 985 | ||
| 986 | 0 | value = JS_strtod(cstr, &estr, &err); |
| 987 | 0 | if (err == JS_DTOA_ENOMEM) { |
| 988 | 0 | JS_ReportOutOfMemory(cx); |
| 989 | 0 | JS_free(cx, cstr); |
| 990 | 0 | return JS_FALSE; |
| 991 | } | |
| 992 | 0 | if (err == JS_DTOA_ERANGE && value == HUGE_VAL) |
| 993 | 0 | value = *cx->runtime->jsPositiveInfinity; |
| 994 | 0 | JS_free(cx, cstr); |
| 995 | 0 | } else if ((base & (base - 1)) == 0) { |
| 996 | /* | |
| 997 | * The number may also be inaccurate for power-of-two bases. This | |
| 998 | * happens if the addition in value * base + digit causes a round- | |
| 999 | * down to an even least significant mantissa bit when the first | |
| 1000 | * dropped bit is a one. If any of the following digits in the | |
| 1001 | * number (which haven't been added in yet) are nonzero, then the | |
| 1002 | * correct action would have been to round up instead of down. An | |
| 1003 | * example occurs when reading the number 0x1000000000000081, which | |
| 1004 | * rounds to 0x1000000000000000 instead of 0x1000000000000100. | |
| 1005 | */ | |
| 1006 | 0 | struct BinaryDigitReader bdr; |
| 1007 | 0 | intN bit, bit2; |
| 1008 | 0 | intN j; |
| 1009 | ||
| 1010 | 0 | bdr.base = base; |
| 1011 | 0 | bdr.digitMask = 0; |
| 1012 | 0 | bdr.digits = start; |
| 1013 | 0 | bdr.end = s1; |
| 1014 | 0 | value = 0.0; |
| 1015 | ||
| 1016 | /* Skip leading zeros. */ | |
| 1017 | 0 | do { |
| 1018 | 0 | bit = GetNextBinaryDigit(&bdr); |
| 1019 | 0 | } while (bit == 0); |
| 1020 | ||
| 1021 | 0 | if (bit == 1) { |
| 1022 | /* Gather the 53 significant bits (including the leading 1) */ | |
| 1023 | 0 | value = 1.0; |
| 1024 | 0 | for (j = 52; j; j--) { |
| 1025 | 0 | bit = GetNextBinaryDigit(&bdr); |
| 1026 | 0 | if (bit < 0) |
| 1027 | 0 | goto done; |
| 1028 | 0 | value = value*2 + bit; |
| 1029 | } | |
| 1030 | /* bit2 is the 54th bit (the first dropped from the mantissa) */ | |
| 1031 | 0 | bit2 = GetNextBinaryDigit(&bdr); |
| 1032 | 0 | if (bit2 >= 0) { |
| 1033 | 0 | jsdouble factor = 2.0; |
| 1034 | 0 | intN sticky = 0; /* sticky is 1 if any bit beyond the 54th is 1 */ |
| 1035 | 0 | intN bit3; |
| 1036 | ||
| 1037 | 0 | while ((bit3 = GetNextBinaryDigit(&bdr)) >= 0) { |
| 1038 | 0 | sticky |= bit3; |
| 1039 | 0 | factor *= 2; |
| 1040 | } | |
| 1041 | 0 | value += bit2 & (bit | sticky); |
| 1042 | 0 | value *= factor; |
| 1043 | } | |
| 1044 | done:; | |
| 1045 | } | |
| 1046 | } | |
| 1047 | } | |
| 1048 | /* We don't worry about inaccurate numbers for any other base. */ | |
| 1049 | ||
| 1050 | 0 | if (s1 == start) { |
| 1051 | 0 | *dp = 0.0; |
| 1052 | 0 | *ep = s; |
| 1053 | } else { | |
| 1054 | 0 | *dp = negative ? -value : value; |
| 1055 | 0 | *ep = s1; |
| 1056 | } | |
| 1057 | 0 | return JS_TRUE; |