/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * The contents of this file are subject to the Netscape 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/NPL/ * * 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 Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the * terms of the GNU Public License (the "GPL"), in which case the * provisions of the GPL are applicable instead of those above. * If you wish to allow use of your version of this file only * under the terms of the GPL and not to allow others to use your * version of this file under the NPL, indicate your decision by * deleting the provisions above and replace them with the notice * and other provisions required by the GPL. If you do not delete * the provisions above, a recipient may use your version of this * file under either the NPL or the GPL. */ #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 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 #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. */ typedef union { jsdouble value; struct { #if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM) uint32 lsw; uint32 msw; #else uint32 msw; uint32 lsw; #endif } parts; } js_ieee_double_shape_type; #define JSDOUBLE_HI32(x) (__extension__ ({ js_ieee_double_shape_type sh_u; \ sh_u.value = (x); \ sh_u.parts.msw; })) #define JSDOUBLE_LO32(x) (__extension__ ({ js_ieee_double_shape_type sh_u; \ sh_u.value = (x); \ sh_u.parts.lsw; })) #define JSDOUBLE_SET_HI32(x, y) (__extension__ ({ \ js_ieee_double_shape_type sh_u; \ sh_u.value = (x); \ sh_u.parts.msw = (y); \ (x) = sh_u.value; })) #define JSDOUBLE_SET_LO32(x, y) (__extension__ ({ \ js_ieee_double_shape_type sh_u; \ sh_u.value = (x); \ sh_u.parts.lsw = (y); \ (x) = sh_u.value; })) #else /* 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 /* 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)))) /* 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 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); 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 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. * If the string does not have a number in it, 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 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. * May experience roundoff errors for very large numbers of a different radix. * If the string does not have a number in it, 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___ */