diff options
Diffstat (limited to 'src/third_party/js-1.7/jsnum.h')
| -rw-r--r-- | src/third_party/js-1.7/jsnum.h | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/src/third_party/js-1.7/jsnum.h b/src/third_party/js-1.7/jsnum.h new file mode 100644 index 00000000000..cd99501e77f --- /dev/null +++ b/src/third_party/js-1.7/jsnum.h @@ -0,0 +1,268 @@ +/* -*- 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): + * + * 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 ***** */ + +#ifndef jsnum_h___ +#define jsnum_h___ +/* + * JS number (IEEE double) interface. + * + * JS numbers are optimistically stored in the top 31 bits of 32-bit integers, + * but floating point literals, results that overflow 31 bits, and division and + * modulus operands and results require a 64-bit IEEE double. These are GC'ed + * and pointed to by 32-bit jsvals on the stack and in object properties. + * + * When a JS number is treated as an object (followed by . or []), the runtime + * wraps it with a JSObject whose valueOf method returns the unwrapped number. + */ + +JS_BEGIN_EXTERN_C + +/* + * Stefan Hanske <sh990154@mail.uni-greifswald.de> reports: + * ARM is a little endian architecture but 64 bit double words are stored + * differently: the 32 bit words are in little endian byte order, the two words + * are stored in big endian`s way. + */ + +#if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__) +#define CPU_IS_ARM +#endif + +typedef union jsdpun { + struct { +#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM) + uint32 lo, hi; +#else + uint32 hi, lo; +#endif + } s; + jsdouble d; +} jsdpun; + +#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2 +/* + * This version of the macros is safe for the alias optimizations that gcc + * does, but uses gcc-specific extensions. + */ + +#define JSDOUBLE_HI32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.hi; })) +#define JSDOUBLE_LO32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.lo; })) +#define JSDOUBLE_SET_HI32(x, y) \ + (__extension__ ({ jsdpun u; u.d = (x); u.s.hi = (y); (x) = u.d; })) +#define JSDOUBLE_SET_LO32(x, y) \ + (__extension__ ({ jsdpun u; u.d = (x); u.s.lo = (y); (x) = u.d; })) + +#else /* not or old GNUC */ + +/* + * We don't know of any non-gcc compilers that perform alias optimization, + * so this code should work. + */ + +#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM) +#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[1]) +#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[0]) +#else +#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[0]) +#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[1]) +#endif + +#define JSDOUBLE_SET_HI32(x, y) (JSDOUBLE_HI32(x)=(y)) +#define JSDOUBLE_SET_LO32(x, y) (JSDOUBLE_LO32(x)=(y)) + +#endif /* not or old GNUC */ + +#define JSDOUBLE_HI32_SIGNBIT 0x80000000 +#define JSDOUBLE_HI32_EXPMASK 0x7ff00000 +#define JSDOUBLE_HI32_MANTMASK 0x000fffff + +#define JSDOUBLE_IS_NaN(x) \ + ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK && \ + (JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK))) + +#define JSDOUBLE_IS_INFINITE(x) \ + ((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK && \ + !JSDOUBLE_LO32(x)) + +#define JSDOUBLE_IS_FINITE(x) \ + ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK) + +#define JSDOUBLE_IS_NEGZERO(d) (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \ + JSDOUBLE_LO32(d) == 0) + +/* + * JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid + * raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is + * safe) leaves i as (jsint)d. This also avoid anomalous NaN floating point + * comparisons under MSVC. + */ +#define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d) \ + && !JSDOUBLE_IS_NEGZERO(d) \ + && ((d) == (i = (jsint)(d)))) + +#if defined(XP_WIN) +#define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN) \ + ((JSDOUBLE_IS_NaN(LVAL) || JSDOUBLE_IS_NaN(RVAL)) \ + ? (IFNAN) \ + : (LVAL) OP (RVAL)) +#else +#define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN) ((LVAL) OP (RVAL)) +#endif + +/* Initialize number constants and runtime state for the first context. */ +extern JSBool +js_InitRuntimeNumberState(JSContext *cx); + +extern void +js_FinishRuntimeNumberState(JSContext *cx); + +/* Initialize the Number class, returning its prototype object. */ +extern JSClass js_NumberClass; + +extern JSObject * +js_InitNumberClass(JSContext *cx, JSObject *obj); + +/* + * String constants for global function names, used in jsapi.c and jsnum.c. + */ +extern const char js_Infinity_str[]; +extern const char js_NaN_str[]; +extern const char js_isNaN_str[]; +extern const char js_isFinite_str[]; +extern const char js_parseFloat_str[]; +extern const char js_parseInt_str[]; + +/* GC-allocate a new JS number. */ +extern jsdouble * +js_NewDouble(JSContext *cx, jsdouble d, uintN gcflag); + +extern void +js_FinalizeDouble(JSContext *cx, jsdouble *dp); + +extern JSBool +js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval); + +extern JSBool +js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval); + +/* Construct a Number instance that wraps around d. */ +extern JSObject * +js_NumberToObject(JSContext *cx, jsdouble d); + +/* Convert a number to a GC'ed string. */ +extern JSString * +js_NumberToString(JSContext *cx, jsdouble d); + +/* + * Convert a value to a number, returning false after reporting any error, + * otherwise returning true with *dp set. + */ +extern JSBool +js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp); + +/* + * Convert a value or a double to an int32, according to the ECMA rules + * for ToInt32. + */ +extern JSBool +js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip); + +extern JSBool +js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip); + +/* + * Convert a value or a double to a uint32, according to the ECMA rules + * for ToUint32. + */ +extern JSBool +js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip); + +extern JSBool +js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip); + +/* + * Convert a value to a number, then to an int32 if it fits by rounding to + * nearest; but failing with an error report if the double is out of range + * or unordered. + */ +extern JSBool +js_ValueToInt32(JSContext *cx, jsval v, int32 *ip); + +/* + * Convert a value to a number, then to a uint16 according to the ECMA rules + * for ToUint16. + */ +extern JSBool +js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip); + +/* + * Convert a jsdouble to an integral number, stored in a jsdouble. + * If d is NaN, return 0. If d is an infinity, return it without conversion. + */ +extern jsdouble +js_DoubleToInteger(jsdouble d); + +/* + * Similar to strtod except that it replaces overflows with infinities of the + * correct sign, and underflows with zeros of the correct sign. Guaranteed to + * return the closest double number to the given input in dp. + * + * Also allows inputs of the form [+|-]Infinity, which produce an infinity of + * the appropriate sign. The case of the "Infinity" string must match exactly. + * If the string does not contain a number, set *ep to s and return 0.0 in dp. + * Return false if out of memory. + */ +extern JSBool +js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp); + +/* + * Similar to strtol except that it handles integers of arbitrary size. + * Guaranteed to return the closest double number to the given input when radix + * is 10 or a power of 2. Callers may see round-off errors for very large + * numbers of a different radix than 10 or a power of 2. + * + * If the string does not contain a number, set *ep to s and return 0.0 in dp. + * Return false if out of memory. + */ +extern JSBool +js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint radix, jsdouble *dp); + +JS_END_EXTERN_C + +#endif /* jsnum_h___ */ |