diff options
Diffstat (limited to 'src/third_party/js-1.7/jsnum.c')
-rw-r--r-- | src/third_party/js-1.7/jsnum.c | 1147 |
1 files changed, 1147 insertions, 0 deletions
diff --git a/src/third_party/js-1.7/jsnum.c b/src/third_party/js-1.7/jsnum.c new file mode 100644 index 00000000000..987619dbde6 --- /dev/null +++ b/src/third_party/js-1.7/jsnum.c @@ -0,0 +1,1147 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * + * ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Mozilla Communicator client code, released + * March 31, 1998. + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * IBM Corp. + * + * Alternatively, the contents of this file may be used under the terms of + * either of the GNU General Public License Version 2 or later (the "GPL"), + * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +/* + * JS number type and wrapper class. + */ +#include "jsstddef.h" +#if defined(XP_WIN) || defined(XP_OS2) +#include <float.h> +#endif +#include <locale.h> +#include <limits.h> +#include <math.h> +#include <stdlib.h> +#include <string.h> +#include "jstypes.h" +#include "jsutil.h" /* Added by JSIFY */ +#include "jsapi.h" +#include "jsatom.h" +#include "jscntxt.h" +#include "jsconfig.h" +#include "jsdtoa.h" +#include "jsgc.h" +#include "jsinterp.h" +#include "jsnum.h" +#include "jsobj.h" +#include "jsopcode.h" +#include "jsprf.h" +#include "jsstr.h" + +static JSBool +num_isNaN(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsdouble x; + + if (!js_ValueToNumber(cx, argv[0], &x)) + return JS_FALSE; + *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_NaN(x)); + return JS_TRUE; +} + +static JSBool +num_isFinite(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsdouble x; + + if (!js_ValueToNumber(cx, argv[0], &x)) + return JS_FALSE; + *rval = BOOLEAN_TO_JSVAL(JSDOUBLE_IS_FINITE(x)); + return JS_TRUE; +} + +static JSBool +num_parseFloat(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + JSString *str; + jsdouble d; + const jschar *bp, *ep; + + str = js_ValueToString(cx, argv[0]); + if (!str) + return JS_FALSE; + /* XXXbe js_strtod shouldn't require NUL termination */ + bp = js_UndependString(cx, str); + if (!bp) + return JS_FALSE; + if (!js_strtod(cx, bp, &ep, &d)) + return JS_FALSE; + if (ep == bp) { + *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); + return JS_TRUE; + } + return js_NewNumberValue(cx, d, rval); +} + +/* See ECMA 15.1.2.2. */ +static JSBool +num_parseInt(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsint radix; + JSString *str; + jsdouble d; + const jschar *bp, *ep; + + if (argc > 1) { + if (!js_ValueToECMAInt32(cx, argv[1], &radix)) + return JS_FALSE; + } else { + radix = 0; + } + if (radix != 0 && (radix < 2 || radix > 36)) { + *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); + return JS_TRUE; + } + + str = js_ValueToString(cx, argv[0]); + if (!str) + return JS_FALSE; + /* XXXbe js_strtointeger shouldn't require NUL termination */ + bp = js_UndependString(cx, str); + if (!bp) + return JS_FALSE; + if (!js_strtointeger(cx, bp, &ep, radix, &d)) + return JS_FALSE; + if (ep == bp) { + *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN); + return JS_TRUE; + } + return js_NewNumberValue(cx, d, rval); +} + +const char js_Infinity_str[] = "Infinity"; +const char js_NaN_str[] = "NaN"; +const char js_isNaN_str[] = "isNaN"; +const char js_isFinite_str[] = "isFinite"; +const char js_parseFloat_str[] = "parseFloat"; +const char js_parseInt_str[] = "parseInt"; + +static JSFunctionSpec number_functions[] = { + {js_isNaN_str, num_isNaN, 1,0,0}, + {js_isFinite_str, num_isFinite, 1,0,0}, + {js_parseFloat_str, num_parseFloat, 1,0,0}, + {js_parseInt_str, num_parseInt, 2,0,0}, + {0,0,0,0,0} +}; + +JSClass js_NumberClass = { + js_Number_str, + JSCLASS_HAS_PRIVATE | JSCLASS_HAS_CACHED_PROTO(JSProto_Number), + JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, + JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub, + JSCLASS_NO_OPTIONAL_MEMBERS +}; + +static JSBool +Number(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsdouble d; + jsval v; + + if (argc != 0) { + if (!js_ValueToNumber(cx, argv[0], &d)) + return JS_FALSE; + } else { + d = 0.0; + } + if (!js_NewNumberValue(cx, d, &v)) + return JS_FALSE; + if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) { + *rval = v; + return JS_TRUE; + } + OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, v); + return JS_TRUE; +} + +#if JS_HAS_TOSOURCE +static JSBool +num_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsval v; + jsdouble d; + char numBuf[DTOSTR_STANDARD_BUFFER_SIZE], *numStr; + char buf[64]; + JSString *str; + + if (JSVAL_IS_NUMBER((jsval)obj)) { + v = (jsval)obj; + } else { + if (!JS_InstanceOf(cx, obj, &js_NumberClass, argv)) + return JS_FALSE; + v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); + JS_ASSERT(JSVAL_IS_NUMBER(v)); + } + d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); + numStr = JS_dtostr(numBuf, sizeof numBuf, DTOSTR_STANDARD, 0, d); + if (!numStr) { + JS_ReportOutOfMemory(cx); + return JS_FALSE; + } + JS_snprintf(buf, sizeof buf, "(new %s(%s))", js_NumberClass.name, numStr); + str = JS_NewStringCopyZ(cx, buf); + if (!str) + return JS_FALSE; + *rval = STRING_TO_JSVAL(str); + return JS_TRUE; +} +#endif + +/* The buf must be big enough for MIN_INT to fit including '-' and '\0'. */ +static char * +IntToString(jsint i, char *buf, size_t bufSize) +{ + char *cp; + jsuint u; + + u = (i < 0) ? -i : i; + + cp = buf + bufSize; /* one past last buffer cell */ + *--cp = '\0'; /* null terminate the string to be */ + + /* + * Build the string from behind. We use multiply and subtraction + * instead of modulus because that's much faster. + */ + do { + jsuint newu = u / 10; + *--cp = (char)(u - newu * 10) + '0'; + u = newu; + } while (u != 0); + + if (i < 0) + *--cp = '-'; + + return cp; +} + +static JSBool +num_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + jsval v; + jsdouble d; + jsint base; + JSString *str; + + if (JSVAL_IS_NUMBER((jsval)obj)) { + v = (jsval)obj; + } else { + if (!JS_InstanceOf(cx, obj, &js_NumberClass, argv)) + return JS_FALSE; + v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); + JS_ASSERT(JSVAL_IS_NUMBER(v)); + } + d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); + base = 10; + if (argc != 0) { + if (!js_ValueToECMAInt32(cx, argv[0], &base)) + return JS_FALSE; + if (base < 2 || base > 36) { + char numBuf[12]; + char *numStr = IntToString(base, numBuf, sizeof numBuf); + JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_RADIX, + numStr); + return JS_FALSE; + } + } + if (base == 10) { + str = js_NumberToString(cx, d); + } else { + char *dStr = JS_dtobasestr(base, d); + if (!dStr) { + JS_ReportOutOfMemory(cx); + return JS_FALSE; + } + str = JS_NewStringCopyZ(cx, dStr); + free(dStr); + } + if (!str) + return JS_FALSE; + *rval = STRING_TO_JSVAL(str); + return JS_TRUE; +} + +static JSBool +num_toLocaleString(JSContext *cx, JSObject *obj, uintN argc, + jsval *argv, jsval *rval) +{ + char thousandsLength, decimalLength; + const char *numGrouping, *tmpGroup; + JSRuntime *rt; + JSString *numStr, *str; + char *num, *buf, *dec, *end, *tmpSrc, *tmpDest; + int digits, size, remainder, nrepeat; + + /* + * Create the string, move back to bytes to make string twiddling + * a bit easier and so we can insert platform charset seperators. + */ + if (!num_toString(cx, obj, 0, argv, rval)) + return JS_FALSE; + JS_ASSERT(JSVAL_IS_STRING(*rval)); + numStr = JSVAL_TO_STRING(*rval); + num = js_GetStringBytes(cx->runtime, numStr); + + /* Find bit before the decimal. */ + dec = strchr(num, '.'); + digits = dec ? dec - num : (int)strlen(num); + end = num + digits; + + rt = cx->runtime; + thousandsLength = strlen(rt->thousandsSeparator); + decimalLength = strlen(rt->decimalSeparator); + + /* Figure out how long resulting string will be. */ + size = digits + (dec ? decimalLength + strlen(dec + 1) : 0); + + numGrouping = tmpGroup = rt->numGrouping; + remainder = digits; + if (*num == '-') + remainder--; + + while (*tmpGroup != CHAR_MAX && *tmpGroup != '\0') { + if (*tmpGroup >= remainder) + break; + size += thousandsLength; + remainder -= *tmpGroup; + tmpGroup++; + } + if (*tmpGroup == '\0' && *numGrouping != '\0') { + nrepeat = (remainder - 1) / tmpGroup[-1]; + size += thousandsLength * nrepeat; + remainder -= nrepeat * tmpGroup[-1]; + } else { + nrepeat = 0; + } + tmpGroup--; + + buf = (char *)JS_malloc(cx, size + 1); + if (!buf) + return JS_FALSE; + + tmpDest = buf; + tmpSrc = num; + + while (*tmpSrc == '-' || remainder--) + *tmpDest++ = *tmpSrc++; + while (tmpSrc < end) { + strcpy(tmpDest, rt->thousandsSeparator); + tmpDest += thousandsLength; + memcpy(tmpDest, tmpSrc, *tmpGroup); + tmpDest += *tmpGroup; + tmpSrc += *tmpGroup; + if (--nrepeat < 0) + tmpGroup--; + } + + if (dec) { + strcpy(tmpDest, rt->decimalSeparator); + tmpDest += decimalLength; + strcpy(tmpDest, dec + 1); + } else { + *tmpDest++ = '\0'; + } + + if (cx->localeCallbacks && cx->localeCallbacks->localeToUnicode) + return cx->localeCallbacks->localeToUnicode(cx, buf, rval); + + str = JS_NewString(cx, buf, size); + if (!str) { + JS_free(cx, buf); + return JS_FALSE; + } + + *rval = STRING_TO_JSVAL(str); + + return JS_TRUE; +} + +static JSBool +num_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + if (JSVAL_IS_NUMBER((jsval)obj)) { + *rval = (jsval)obj; + return JS_TRUE; + } + if (!JS_InstanceOf(cx, obj, &js_NumberClass, argv)) + return JS_FALSE; + *rval = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); + return JS_TRUE; +} + + +#define MAX_PRECISION 100 + +static JSBool +num_to(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval, JSDToStrMode zeroArgMode, + JSDToStrMode oneArgMode, jsint precisionMin, jsint precisionMax, jsint precisionOffset) +{ + jsval v; + jsdouble d, precision; + JSString *str; + char buf[DTOSTR_VARIABLE_BUFFER_SIZE(MAX_PRECISION+1)], *numStr; /* Use MAX_PRECISION+1 because precisionOffset can be 1 */ + + if (JSVAL_IS_NUMBER((jsval)obj)) { + v = (jsval)obj; + } else { + if (!JS_InstanceOf(cx, obj, &js_NumberClass, argv)) + return JS_FALSE; + v = OBJ_GET_SLOT(cx, obj, JSSLOT_PRIVATE); + JS_ASSERT(JSVAL_IS_NUMBER(v)); + } + d = JSVAL_IS_INT(v) ? (jsdouble)JSVAL_TO_INT(v) : *JSVAL_TO_DOUBLE(v); + + if (JSVAL_IS_VOID(argv[0])) { + precision = 0.0; + oneArgMode = zeroArgMode; + } else { + if (!js_ValueToNumber(cx, argv[0], &precision)) + return JS_FALSE; + precision = js_DoubleToInteger(precision); + if (precision < precisionMin || precision > precisionMax) { + numStr = JS_dtostr(buf, sizeof buf, DTOSTR_STANDARD, 0, precision); + if (!numStr) + JS_ReportOutOfMemory(cx); + else + JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_PRECISION_RANGE, numStr); + return JS_FALSE; + } + } + + numStr = JS_dtostr(buf, sizeof buf, oneArgMode, (jsint)precision + precisionOffset, d); + if (!numStr) { + JS_ReportOutOfMemory(cx); + return JS_FALSE; + } + str = JS_NewStringCopyZ(cx, numStr); + if (!str) + return JS_FALSE; + *rval = STRING_TO_JSVAL(str); + return JS_TRUE; +} + +static JSBool +num_toFixed(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ + return num_to(cx, obj, argc, argv, rval, DTOSTR_FIXED, DTOSTR_FIXED, -20, MAX_PRECISION, 0); +} + +static JSBool +num_toExponential(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ + return num_to(cx, obj, argc, argv, rval, DTOSTR_STANDARD_EXPONENTIAL, DTOSTR_EXPONENTIAL, 0, MAX_PRECISION, 1); +} + +static JSBool +num_toPrecision(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) +{ + /* We allow a larger range of precision than ECMA requires; this is permitted by ECMA. */ + return num_to(cx, obj, argc, argv, rval, DTOSTR_STANDARD, DTOSTR_PRECISION, 1, MAX_PRECISION, 0); +} + +static JSFunctionSpec number_methods[] = { +#if JS_HAS_TOSOURCE + {js_toSource_str, num_toSource, 0,JSFUN_THISP_NUMBER,0}, +#endif + {js_toString_str, num_toString, 0,JSFUN_THISP_NUMBER,0}, + {js_toLocaleString_str, num_toLocaleString, 0,JSFUN_THISP_NUMBER,0}, + {js_valueOf_str, num_valueOf, 0,JSFUN_THISP_NUMBER,0}, + {"toFixed", num_toFixed, 1,JSFUN_THISP_NUMBER,0}, + {"toExponential", num_toExponential, 1,JSFUN_THISP_NUMBER,0}, + {"toPrecision", num_toPrecision, 1,JSFUN_THISP_NUMBER,0}, + {0,0,0,0,0} +}; + +/* NB: Keep this in synch with number_constants[]. */ +enum nc_slot { + NC_NaN, + NC_POSITIVE_INFINITY, + NC_NEGATIVE_INFINITY, + NC_MAX_VALUE, + NC_MIN_VALUE, + NC_LIMIT +}; + +/* + * Some to most C compilers forbid spelling these at compile time, or barf + * if you try, so all but MAX_VALUE are set up by js_InitRuntimeNumberState + * using union jsdpun. + */ +static JSConstDoubleSpec number_constants[] = { + {0, js_NaN_str, 0,{0,0,0}}, + {0, "POSITIVE_INFINITY", 0,{0,0,0}}, + {0, "NEGATIVE_INFINITY", 0,{0,0,0}}, + {1.7976931348623157E+308, "MAX_VALUE", 0,{0,0,0}}, + {0, "MIN_VALUE", 0,{0,0,0}}, + {0,0,0,{0,0,0}} +}; + +static jsdouble NaN; + +#if (defined XP_WIN || defined XP_OS2) && \ + !defined WINCE && \ + !defined __MWERKS__ && \ + (defined _M_IX86 || \ + (defined __GNUC__ && !defined __MINGW32__)) + +/* + * Set the exception mask to mask all exceptions and set the FPU precision + * to 53 bit mantissa. + * On Alpha platform this is handled via Compiler option. + */ +#define FIX_FPU() _control87(MCW_EM | PC_53, MCW_EM | MCW_PC) + +#else + +#define FIX_FPU() ((void)0) + +#endif + +JSBool +js_InitRuntimeNumberState(JSContext *cx) +{ + JSRuntime *rt; + jsdpun u; + struct lconv *locale; + + rt = cx->runtime; + JS_ASSERT(!rt->jsNaN); + + FIX_FPU(); + + u.s.hi = JSDOUBLE_HI32_EXPMASK | JSDOUBLE_HI32_MANTMASK; + u.s.lo = 0xffffffff; + number_constants[NC_NaN].dval = NaN = u.d; + rt->jsNaN = js_NewDouble(cx, NaN, GCF_LOCK); + if (!rt->jsNaN) + return JS_FALSE; + + u.s.hi = JSDOUBLE_HI32_EXPMASK; + u.s.lo = 0x00000000; + number_constants[NC_POSITIVE_INFINITY].dval = u.d; + rt->jsPositiveInfinity = js_NewDouble(cx, u.d, GCF_LOCK); + if (!rt->jsPositiveInfinity) + return JS_FALSE; + + u.s.hi = JSDOUBLE_HI32_SIGNBIT | JSDOUBLE_HI32_EXPMASK; + u.s.lo = 0x00000000; + number_constants[NC_NEGATIVE_INFINITY].dval = u.d; + rt->jsNegativeInfinity = js_NewDouble(cx, u.d, GCF_LOCK); + if (!rt->jsNegativeInfinity) + return JS_FALSE; + + u.s.hi = 0; + u.s.lo = 1; + number_constants[NC_MIN_VALUE].dval = u.d; + + locale = localeconv(); + rt->thousandsSeparator = + JS_strdup(cx, locale->thousands_sep ? locale->thousands_sep : "'"); + rt->decimalSeparator = + JS_strdup(cx, locale->decimal_point ? locale->decimal_point : "."); + rt->numGrouping = + JS_strdup(cx, locale->grouping ? locale->grouping : "\3\0"); + + return rt->thousandsSeparator && rt->decimalSeparator && rt->numGrouping; +} + +void +js_FinishRuntimeNumberState(JSContext *cx) +{ + JSRuntime *rt = cx->runtime; + + js_UnlockGCThingRT(rt, rt->jsNaN); + js_UnlockGCThingRT(rt, rt->jsNegativeInfinity); + js_UnlockGCThingRT(rt, rt->jsPositiveInfinity); + + rt->jsNaN = NULL; + rt->jsNegativeInfinity = NULL; + rt->jsPositiveInfinity = NULL; + + JS_free(cx, (void *)rt->thousandsSeparator); + JS_free(cx, (void *)rt->decimalSeparator); + JS_free(cx, (void *)rt->numGrouping); + rt->thousandsSeparator = rt->decimalSeparator = rt->numGrouping = NULL; +} + +JSObject * +js_InitNumberClass(JSContext *cx, JSObject *obj) +{ + JSObject *proto, *ctor; + JSRuntime *rt; + + /* XXX must do at least once per new thread, so do it per JSContext... */ + FIX_FPU(); + + if (!JS_DefineFunctions(cx, obj, number_functions)) + return NULL; + + proto = JS_InitClass(cx, obj, NULL, &js_NumberClass, Number, 1, + NULL, number_methods, NULL, NULL); + if (!proto || !(ctor = JS_GetConstructor(cx, proto))) + return NULL; + OBJ_SET_SLOT(cx, proto, JSSLOT_PRIVATE, JSVAL_ZERO); + if (!JS_DefineConstDoubles(cx, ctor, number_constants)) + return NULL; + + /* ECMA 15.1.1.1 */ + rt = cx->runtime; + if (!JS_DefineProperty(cx, obj, js_NaN_str, DOUBLE_TO_JSVAL(rt->jsNaN), + NULL, NULL, JSPROP_PERMANENT)) { + return NULL; + } + + /* ECMA 15.1.1.2 */ + if (!JS_DefineProperty(cx, obj, js_Infinity_str, + DOUBLE_TO_JSVAL(rt->jsPositiveInfinity), + NULL, NULL, JSPROP_PERMANENT)) { + return NULL; + } + return proto; +} + +jsdouble * +js_NewDouble(JSContext *cx, jsdouble d, uintN gcflag) +{ + jsdouble *dp; + + dp = (jsdouble *) js_NewGCThing(cx, gcflag | GCX_DOUBLE, sizeof(jsdouble)); + if (!dp) + return NULL; + *dp = d; + return dp; +} + +void +js_FinalizeDouble(JSContext *cx, jsdouble *dp) +{ + *dp = NaN; +} + +JSBool +js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval) +{ + jsdouble *dp; + + dp = js_NewDouble(cx, d, 0); + if (!dp) + return JS_FALSE; + *rval = DOUBLE_TO_JSVAL(dp); + return JS_TRUE; +} + +JSBool +js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval) +{ + jsint i; + + if (JSDOUBLE_IS_INT(d, i) && INT_FITS_IN_JSVAL(i)) { + *rval = INT_TO_JSVAL(i); + } else { + if (!js_NewDoubleValue(cx, d, rval)) + return JS_FALSE; + } + return JS_TRUE; +} + +JSObject * +js_NumberToObject(JSContext *cx, jsdouble d) +{ + JSObject *obj; + jsval v; + + obj = js_NewObject(cx, &js_NumberClass, NULL, NULL); + if (!obj) + return NULL; + if (!js_NewNumberValue(cx, d, &v)) { + cx->weakRoots.newborn[GCX_OBJECT] = NULL; + return NULL; + } + OBJ_SET_SLOT(cx, obj, JSSLOT_PRIVATE, v); + return obj; +} + +JSString * +js_NumberToString(JSContext *cx, jsdouble d) +{ + jsint i; + char buf[DTOSTR_STANDARD_BUFFER_SIZE]; + char *numStr; + + if (JSDOUBLE_IS_INT(d, i)) { + numStr = IntToString(i, buf, sizeof buf); + } else { + numStr = JS_dtostr(buf, sizeof buf, DTOSTR_STANDARD, 0, d); + if (!numStr) { + JS_ReportOutOfMemory(cx); + return NULL; + } + } + return JS_NewStringCopyZ(cx, numStr); +} + +JSBool +js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp) +{ + JSObject *obj; + JSString *str; + const jschar *bp, *ep; + + if (JSVAL_IS_OBJECT(v)) { + obj = JSVAL_TO_OBJECT(v); + if (!obj) { + *dp = 0; + return JS_TRUE; + } + if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_NUMBER, &v)) + return JS_FALSE; + } + if (JSVAL_IS_INT(v)) { + *dp = (jsdouble)JSVAL_TO_INT(v); + } else if (JSVAL_IS_DOUBLE(v)) { + *dp = *JSVAL_TO_DOUBLE(v); + } else if (JSVAL_IS_STRING(v)) { + str = JSVAL_TO_STRING(v); + /* + * Note that ECMA doesn't treat a string beginning with a '0' as an + * octal number here. This works because all such numbers will be + * interpreted as decimal by js_strtod and will never get passed to + * js_strtointeger (which would interpret them as octal). + */ + /* XXXbe js_strtod shouldn't require NUL termination */ + bp = js_UndependString(cx, str); + if (!bp) + return JS_FALSE; + if ((!js_strtod(cx, bp, &ep, dp) || + js_SkipWhiteSpace(ep) != bp + str->length) && + (!js_strtointeger(cx, bp, &ep, 0, dp) || + js_SkipWhiteSpace(ep) != bp + str->length)) { + goto badstr; + } + } else if (JSVAL_IS_BOOLEAN(v)) { + *dp = JSVAL_TO_BOOLEAN(v) ? 1 : 0; + } else { +badstr: + *dp = *cx->runtime->jsNaN; + } + return JS_TRUE; +} + +JSBool +js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip) +{ + jsdouble d; + + if (!js_ValueToNumber(cx, v, &d)) + return JS_FALSE; + return js_DoubleToECMAInt32(cx, d, ip); +} + +JSBool +js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip) +{ + jsdouble two32 = 4294967296.0; + jsdouble two31 = 2147483648.0; + + if (!JSDOUBLE_IS_FINITE(d) || d == 0) { + *ip = 0; + return JS_TRUE; + } + d = fmod(d, two32); + d = (d >= 0) ? floor(d) : ceil(d) + two32; + if (d >= two31) + *ip = (int32)(d - two32); + else + *ip = (int32)d; + return JS_TRUE; +} + +JSBool +js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip) +{ + jsdouble d; + + if (!js_ValueToNumber(cx, v, &d)) + return JS_FALSE; + return js_DoubleToECMAUint32(cx, d, ip); +} + +JSBool +js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip) +{ + JSBool neg; + jsdouble two32 = 4294967296.0; + + if (!JSDOUBLE_IS_FINITE(d) || d == 0) { + *ip = 0; + return JS_TRUE; + } + + neg = (d < 0); + d = floor(neg ? -d : d); + d = neg ? -d : d; + + d = fmod(d, two32); + + d = (d >= 0) ? d : d + two32; + *ip = (uint32)d; + return JS_TRUE; +} + +JSBool +js_ValueToInt32(JSContext *cx, jsval v, int32 *ip) +{ + jsdouble d; + JSString *str; + + if (JSVAL_IS_INT(v)) { + *ip = JSVAL_TO_INT(v); + return JS_TRUE; + } + if (!js_ValueToNumber(cx, v, &d)) + return JS_FALSE; + if (JSDOUBLE_IS_NaN(d) || d <= -2147483649.0 || 2147483648.0 <= d) { + str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL); + if (str) { + JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, + JSMSG_CANT_CONVERT, JS_GetStringBytes(str)); + + } + return JS_FALSE; + } + *ip = (int32)floor(d + 0.5); /* Round to nearest */ + return JS_TRUE; +} + +JSBool +js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip) +{ + jsdouble d; + jsuint i, m; + JSBool neg; + + if (!js_ValueToNumber(cx, v, &d)) + return JS_FALSE; + if (d == 0 || !JSDOUBLE_IS_FINITE(d)) { + *ip = 0; + return JS_TRUE; + } + i = (jsuint)d; + if ((jsdouble)i == d) { + *ip = (uint16)i; + return JS_TRUE; + } + neg = (d < 0); + d = floor(neg ? -d : d); + d = neg ? -d : d; + m = JS_BIT(16); + d = fmod(d, (double)m); + if (d < 0) + d += m; + *ip = (uint16) d; + return JS_TRUE; +} + +jsdouble +js_DoubleToInteger(jsdouble d) +{ + JSBool neg; + + if (d == 0) + return d; + if (!JSDOUBLE_IS_FINITE(d)) { + if (JSDOUBLE_IS_NaN(d)) + return 0; + return d; + } + neg = (d < 0); + d = floor(neg ? -d : d); + return neg ? -d : d; +} + + +JSBool +js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp) +{ + char cbuf[32]; + size_t i; + char *cstr, *istr, *estr; + JSBool negative; + jsdouble d; + const jschar *s1 = js_SkipWhiteSpace(s); + size_t length = js_strlen(s1); + + /* Use cbuf to avoid malloc */ + if (length >= sizeof cbuf) { + cstr = (char *) JS_malloc(cx, length + 1); + if (!cstr) + return JS_FALSE; + } else { + cstr = cbuf; + } + + for (i = 0; i <= length; i++) { + if (s1[i] >> 8) { + cstr[i] = 0; + break; + } + cstr[i] = (char)s1[i]; + } + + istr = cstr; + if ((negative = (*istr == '-')) != 0 || *istr == '+') + istr++; + if (!strncmp(istr, js_Infinity_str, sizeof js_Infinity_str - 1)) { + d = *(negative ? cx->runtime->jsNegativeInfinity : cx->runtime->jsPositiveInfinity); + estr = istr + 8; + } else { + int err; + d = JS_strtod(cstr, &estr, &err); + if (err == JS_DTOA_ENOMEM) { + JS_ReportOutOfMemory(cx); + if (cstr != cbuf) + JS_free(cx, cstr); + return JS_FALSE; + } + if (err == JS_DTOA_ERANGE) { + if (d == HUGE_VAL) + d = *cx->runtime->jsPositiveInfinity; + else if (d == -HUGE_VAL) + d = *cx->runtime->jsNegativeInfinity; + } +#ifdef HPUX + if (d == 0.0 && negative) { + /* + * "-0", "-1e-2000" come out as positive zero + * here on HPUX. Force a negative zero instead. + */ + JSDOUBLE_HI32(d) = JSDOUBLE_HI32_SIGNBIT; + JSDOUBLE_LO32(d) = 0; + } +#endif + } + + i = estr - cstr; + if (cstr != cbuf) + JS_free(cx, cstr); + *ep = i ? s1 + i : s; + *dp = d; + return JS_TRUE; +} + +struct BinaryDigitReader +{ + uintN base; /* Base of number; must be a power of 2 */ + uintN digit; /* Current digit value in radix given by base */ + uintN digitMask; /* Mask to extract the next bit from digit */ + const jschar *digits; /* Pointer to the remaining digits */ + const jschar *end; /* Pointer to first non-digit */ +}; + +/* Return the next binary digit from the number or -1 if done */ +static intN GetNextBinaryDigit(struct BinaryDigitReader *bdr) +{ + intN bit; + + if (bdr->digitMask == 0) { + uintN c; + + if (bdr->digits == bdr->end) + return -1; + + c = *bdr->digits++; + if ('0' <= c && c <= '9') + bdr->digit = c - '0'; + else if ('a' <= c && c <= 'z') + bdr->digit = c - 'a' + 10; + else bdr->digit = c - 'A' + 10; + bdr->digitMask = bdr->base >> 1; + } + bit = (bdr->digit & bdr->digitMask) != 0; + bdr->digitMask >>= 1; + return bit; +} + +JSBool +js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint base, jsdouble *dp) +{ + JSBool negative; + jsdouble value; + const jschar *start; + const jschar *s1 = js_SkipWhiteSpace(s); + + if ((negative = (*s1 == '-')) != 0 || *s1 == '+') + s1++; + + if (base == 0) { + /* No base supplied, or some base that evaluated to 0. */ + if (*s1 == '0') { + /* It's either hex or octal; only increment char if str isn't '0' */ + if (s1[1] == 'X' || s1[1] == 'x') { /* Hex */ + s1 += 2; + base = 16; + } else { /* Octal */ + base = 8; + } + } else { + base = 10; /* Default to decimal. */ + } + } else if (base == 16 && *s1 == '0' && (s1[1] == 'X' || s1[1] == 'x')) { + /* If base is 16, ignore hex prefix. */ + s1 += 2; + } + + /* + * Done with the preliminaries; find some prefix of the string that's + * a number in the given base. + */ + start = s1; /* Mark - if string is empty, we return NaN. */ + value = 0.0; + for (;;) { + uintN digit; + jschar c = *s1; + if ('0' <= c && c <= '9') + digit = c - '0'; + else if ('a' <= c && c <= 'z') + digit = c - 'a' + 10; + else if ('A' <= c && c <= 'Z') + digit = c - 'A' + 10; + else + break; + if (digit >= (uintN)base) + break; + value = value * base + digit; + s1++; + } + + if (value >= 9007199254740992.0) { + if (base == 10) { + /* + * If we're accumulating a decimal number and the number is >= + * 2^53, then the result from the repeated multiply-add above may + * be inaccurate. Call JS_strtod to get the correct answer. + */ + size_t i; + size_t length = s1 - start; + char *cstr = (char *) JS_malloc(cx, length + 1); + char *estr; + int err=0; + + if (!cstr) + return JS_FALSE; + for (i = 0; i != length; i++) + cstr[i] = (char)start[i]; + cstr[length] = 0; + + value = JS_strtod(cstr, &estr, &err); + if (err == JS_DTOA_ENOMEM) { + JS_ReportOutOfMemory(cx); + JS_free(cx, cstr); + return JS_FALSE; + } + if (err == JS_DTOA_ERANGE && value == HUGE_VAL) + value = *cx->runtime->jsPositiveInfinity; + JS_free(cx, cstr); + } else if ((base & (base - 1)) == 0) { + /* + * The number may also be inaccurate for power-of-two bases. This + * happens if the addition in value * base + digit causes a round- + * down to an even least significant mantissa bit when the first + * dropped bit is a one. If any of the following digits in the + * number (which haven't been added in yet) are nonzero, then the + * correct action would have been to round up instead of down. An + * example occurs when reading the number 0x1000000000000081, which + * rounds to 0x1000000000000000 instead of 0x1000000000000100. + */ + struct BinaryDigitReader bdr; + intN bit, bit2; + intN j; + + bdr.base = base; + bdr.digitMask = 0; + bdr.digits = start; + bdr.end = s1; + value = 0.0; + + /* Skip leading zeros. */ + do { + bit = GetNextBinaryDigit(&bdr); + } while (bit == 0); + + if (bit == 1) { + /* Gather the 53 significant bits (including the leading 1) */ + value = 1.0; + for (j = 52; j; j--) { + bit = GetNextBinaryDigit(&bdr); + if (bit < 0) + goto done; + value = value*2 + bit; + } + /* bit2 is the 54th bit (the first dropped from the mantissa) */ + bit2 = GetNextBinaryDigit(&bdr); + if (bit2 >= 0) { + jsdouble factor = 2.0; + intN sticky = 0; /* sticky is 1 if any bit beyond the 54th is 1 */ + intN bit3; + + while ((bit3 = GetNextBinaryDigit(&bdr)) >= 0) { + sticky |= bit3; + factor *= 2; + } + value += bit2 & (bit | sticky); + value *= factor; + } + done:; + } + } + } + /* We don't worry about inaccurate numbers for any other base. */ + + if (s1 == start) { + *dp = 0.0; + *ep = s; + } else { + *dp = negative ? -value : value; + *ep = s1; + } + return JS_TRUE; +} |