Return to jsnum.h CVS log

Up to [Synchronet] / sbbs / javascript / include / mozilla / js

Annotation of sbbs/javascript/include/mozilla/js/jsnum.h, revision 1.1

1.1     ! root        1: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
        !             2:  *
        !             3:  * The contents of this file are subject to the Netscape Public
        !             4:  * License Version 1.1 (the "License"); you may not use this file
        !             5:  * except in compliance with the License. You may obtain a copy of
        !             6:  * the License at http://www.mozilla.org/NPL/
        !             7:  *
        !             8:  * Software distributed under the License is distributed on an "AS
        !             9:  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
        !            10:  * implied. See the License for the specific language governing
        !            11:  * rights and limitations under the License.
        !            12:  *
        !            13:  * The Original Code is Mozilla Communicator client code, released
        !            14:  * March 31, 1998.
        !            15:  *
        !            16:  * The Initial Developer of the Original Code is Netscape
        !            17:  * Communications Corporation.  Portions created by Netscape are
        !            18:  * Copyright (C) 1998 Netscape Communications Corporation. All
        !            19:  * Rights Reserved.
        !            20:  *
        !            21:  * Contributor(s):
        !            22:  *
        !            23:  * Alternatively, the contents of this file may be used under the
        !            24:  * terms of the GNU Public License (the "GPL"), in which case the
        !            25:  * provisions of the GPL are applicable instead of those above.
        !            26:  * If you wish to allow use of your version of this file only
        !            27:  * under the terms of the GPL and not to allow others to use your
        !            28:  * version of this file under the NPL, indicate your decision by
        !            29:  * deleting the provisions above and replace them with the notice
        !            30:  * and other provisions required by the GPL.  If you do not delete
        !            31:  * the provisions above, a recipient may use your version of this
        !            32:  * file under either the NPL or the GPL.
        !            33:  */
        !            34: 
        !            35: #ifndef jsnum_h___
        !            36: #define jsnum_h___
        !            37: /*
        !            38:  * JS number (IEEE double) interface.
        !            39:  *
        !            40:  * JS numbers are optimistically stored in the top 31 bits of 32-bit integers,
        !            41:  * but floating point literals, results that overflow 31 bits, and division and
        !            42:  * modulus operands and results require a 64-bit IEEE double.  These are GC'ed
        !            43:  * and pointed to by 32-bit jsvals on the stack and in object properties.
        !            44:  *
        !            45:  * When a JS number is treated as an object (followed by . or []), the runtime
        !            46:  * wraps it with a JSObject whose valueOf method returns the unwrapped number.
        !            47:  */
        !            48: 
        !            49: JS_BEGIN_EXTERN_C
        !            50: 
        !            51: /*
        !            52:  * Stefan Hanske <[email protected]> reports:
        !            53:  *  ARM is a little endian architecture but 64 bit double words are stored
        !            54:  * differently: the 32 bit words are in little endian byte order, the two words
        !            55:  * are stored in big endian`s way.
        !            56:  */
        !            57: 
        !            58: #if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
        !            59: #define CPU_IS_ARM
        !            60: #endif
        !            61: 
        !            62: typedef union jsdpun {
        !            63:     struct {
        !            64: #if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
        !            65:        uint32 lo, hi;
        !            66: #else
        !            67:        uint32 hi, lo;
        !            68: #endif
        !            69:     } s;
        !            70:     jsdouble d;
        !            71: } jsdpun;
        !            72: 
        !            73: #if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
        !            74: /*
        !            75:  * This version of the macros is safe for the alias optimizations that gcc
        !            76:  * does, but uses gcc-specific extensions.
        !            77:  */
        !            78: 
        !            79: #define JSDOUBLE_HI32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.hi; }))
        !            80: #define JSDOUBLE_LO32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.lo; }))
        !            81: #define JSDOUBLE_SET_HI32(x, y) \
        !            82:     (__extension__ ({ jsdpun u; u.d = (x); u.s.hi = (y); (x) = u.d; }))
        !            83: #define JSDOUBLE_SET_LO32(x, y) \
        !            84:     (__extension__ ({ jsdpun u; u.d = (x); u.s.lo = (y); (x) = u.d; }))
        !            85: 
        !            86: #else /* not or old GNUC */
        !            87: 
        !            88: /*
        !            89:  * We don't know of any non-gcc compilers that perform alias optimization,
        !            90:  * so this code should work.
        !            91:  */
        !            92: 
        !            93: #if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
        !            94: #define JSDOUBLE_HI32(x)        (((uint32 *)&(x))[1])
        !            95: #define JSDOUBLE_LO32(x)        (((uint32 *)&(x))[0])
        !            96: #else
        !            97: #define JSDOUBLE_HI32(x)        (((uint32 *)&(x))[0])
        !            98: #define JSDOUBLE_LO32(x)        (((uint32 *)&(x))[1])
        !            99: #endif
        !           100: 
        !           101: #define JSDOUBLE_SET_HI32(x, y) (JSDOUBLE_HI32(x)=(y))
        !           102: #define JSDOUBLE_SET_LO32(x, y) (JSDOUBLE_LO32(x)=(y))
        !           103: 
        !           104: #endif /* not or old GNUC */
        !           105: 
        !           106: #define JSDOUBLE_HI32_SIGNBIT   0x80000000
        !           107: #define JSDOUBLE_HI32_EXPMASK   0x7ff00000
        !           108: #define JSDOUBLE_HI32_MANTMASK  0x000fffff
        !           109: 
        !           110: #define JSDOUBLE_IS_NaN(x)                                                    \
        !           111:     ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK &&   \
        !           112:      (JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK)))
        !           113: 
        !           114: #define JSDOUBLE_IS_INFINITE(x)                                               \
        !           115:     ((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK &&  \
        !           116:      !JSDOUBLE_LO32(x))
        !           117: 
        !           118: #define JSDOUBLE_IS_FINITE(x)                                                 \
        !           119:     ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK)
        !           120: 
        !           121: #define JSDOUBLE_IS_NEGZERO(d)  (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \
        !           122:                                 JSDOUBLE_LO32(d) == 0)
        !           123: 
        !           124: /*
        !           125:  * JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid
        !           126:  * raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is
        !           127:  * safe) leaves i as (jsint)d.  This also avoid anomalous NaN floating point
        !           128:  * comparisons under MSVC.
        !           129:  */
        !           130: #define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d)                          \
        !           131:                                && !JSDOUBLE_IS_NEGZERO(d)                     \
        !           132:                               && ((d) == (i = (jsint)(d))))
        !           133: 
        !           134: /* Initialize number constants and runtime state for the first context. */
        !           135: extern JSBool
        !           136: js_InitRuntimeNumberState(JSContext *cx);
        !           137: 
        !           138: extern void
        !           139: js_FinishRuntimeNumberState(JSContext *cx);
        !           140: 
        !           141: /* Initialize the Number class, returning its prototype object. */
        !           142: extern JSObject *
        !           143: js_InitNumberClass(JSContext *cx, JSObject *obj);
        !           144: 
        !           145: /*
        !           146:  * String constants for global function names, used in jsapi.c and jsnum.c.
        !           147:  */
        !           148: extern const char js_Infinity_str[];
        !           149: extern const char js_NaN_str[];
        !           150: extern const char js_isNaN_str[];
        !           151: extern const char js_isFinite_str[];
        !           152: extern const char js_parseFloat_str[];
        !           153: extern const char js_parseInt_str[];
        !           154: 
        !           155: /* GC-allocate a new JS number. */
        !           156: extern jsdouble *
        !           157: js_NewDouble(JSContext *cx, jsdouble d);
        !           158: 
        !           159: extern void
        !           160: js_FinalizeDouble(JSContext *cx, jsdouble *dp);
        !           161: 
        !           162: extern JSBool
        !           163: js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval);
        !           164: 
        !           165: extern JSBool
        !           166: js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);
        !           167: 
        !           168: /* Construct a Number instance that wraps around d. */
        !           169: extern JSObject *
        !           170: js_NumberToObject(JSContext *cx, jsdouble d);
        !           171: 
        !           172: /* Convert a number to a GC'ed string. */
        !           173: extern JSString *
        !           174: js_NumberToString(JSContext *cx, jsdouble d);
        !           175: 
        !           176: /*
        !           177:  * Convert a value to a number, returning false after reporting any error,
        !           178:  * otherwise returning true with *dp set.
        !           179:  */
        !           180: extern JSBool
        !           181: js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);
        !           182: 
        !           183: /*
        !           184:  * Convert a value or a double to an int32, according to the ECMA rules
        !           185:  * for ToInt32.
        !           186:  */
        !           187: extern JSBool
        !           188: js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);
        !           189: 
        !           190: extern JSBool
        !           191: js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip);
        !           192: 
        !           193: /*
        !           194:  * Convert a value or a double to a uint32, according to the ECMA rules
        !           195:  * for ToUint32.
        !           196:  */
        !           197: extern JSBool
        !           198: js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);
        !           199: 
        !           200: extern JSBool
        !           201: js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip);
        !           202: 
        !           203: /*
        !           204:  * Convert a value to a number, then to an int32 if it fits by rounding to
        !           205:  * nearest; but failing with an error report if the double is out of range
        !           206:  * or unordered.
        !           207:  */
        !           208: extern JSBool
        !           209: js_ValueToInt32(JSContext *cx, jsval v, int32 *ip);
        !           210: 
        !           211: /*
        !           212:  * Convert a value to a number, then to a uint16 according to the ECMA rules
        !           213:  * for ToUint16.
        !           214:  */
        !           215: extern JSBool
        !           216: js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);
        !           217: 
        !           218: /*
        !           219:  * Convert a jsdouble to an integral number, stored in a jsdouble.
        !           220:  * If d is NaN, return 0.  If d is an infinity, return it without conversion.
        !           221:  */
        !           222: extern jsdouble
        !           223: js_DoubleToInteger(jsdouble d);
        !           224: 
        !           225: /*
        !           226:  * Similar to strtod except that it replaces overflows with infinities of the
        !           227:  * correct sign, and underflows with zeros of the correct sign.  Guaranteed to
        !           228:  * return the closest double number to the given input in dp.
        !           229:  *
        !           230:  * Also allows inputs of the form [+|-]Infinity, which produce an infinity of
        !           231:  * the appropriate sign.  The case of the "Infinity" string must match exactly.
        !           232:  * If the string does not contain a number, set *ep to s and return 0.0 in dp.
        !           233:  * Return false if out of memory.
        !           234:  */
        !           235: extern JSBool
        !           236: js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp);
        !           237: 
        !           238: /*
        !           239:  * Similar to strtol except that it handles integers of arbitrary size.
        !           240:  * Guaranteed to return the closest double number to the given input when radix
        !           241:  * is 10 or a power of 2.  Callers may see round-off errors for very large
        !           242:  * numbers of a different radix than 10 or a power of 2.
        !           243:  *
        !           244:  * If the string does not contain a number, set *ep to s and return 0.0 in dp.
        !           245:  * Return false if out of memory.
        !           246:  */
        !           247: extern JSBool
        !           248: js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint radix, jsdouble *dp);
        !           249: 
        !           250: JS_END_EXTERN_C
        !           251: 
        !           252: #endif /* jsnum_h___ */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.