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- /* -*- 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___ */
-