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/js/lib/Socket.IO-node/support/expresso/deps/jscoverage/js/jsnum.h

http://github.com/onedayitwillmake/RealtimeMultiplayerNodeJs
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  1/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  2 *
  3 * ***** BEGIN LICENSE BLOCK *****
  4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  5 *
  6 * The contents of this file are subject to the Mozilla Public License Version
  7 * 1.1 (the "License"); you may not use this file except in compliance with
  8 * the License. You may obtain a copy of the License at
  9 * http://www.mozilla.org/MPL/
 10 *
 11 * Software distributed under the License is distributed on an "AS IS" basis,
 12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 13 * for the specific language governing rights and limitations under the
 14 * License.
 15 *
 16 * The Original Code is Mozilla Communicator client code, released
 17 * March 31, 1998.
 18 *
 19 * The Initial Developer of the Original Code is
 20 * Netscape Communications Corporation.
 21 * Portions created by the Initial Developer are Copyright (C) 1998
 22 * the Initial Developer. All Rights Reserved.
 23 *
 24 * Contributor(s):
 25 *
 26 * Alternatively, the contents of this file may be used under the terms of
 27 * either of the GNU General Public License Version 2 or later (the "GPL"),
 28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 29 * in which case the provisions of the GPL or the LGPL are applicable instead
 30 * of those above. If you wish to allow use of your version of this file only
 31 * under the terms of either the GPL or the LGPL, and not to allow others to
 32 * use your version of this file under the terms of the MPL, indicate your
 33 * decision by deleting the provisions above and replace them with the notice
 34 * and other provisions required by the GPL or the LGPL. If you do not delete
 35 * the provisions above, a recipient may use your version of this file under
 36 * the terms of any one of the MPL, the GPL or the LGPL.
 37 *
 38 * ***** END LICENSE BLOCK ***** */
 39
 40#ifndef jsnum_h___
 41#define jsnum_h___
 42
 43/*
 44 * JS number (IEEE double) interface.
 45 *
 46 * JS numbers are optimistically stored in the top 31 bits of 32-bit integers,
 47 * but floating point literals, results that overflow 31 bits, and division and
 48 * modulus operands and results require a 64-bit IEEE double.  These are GC'ed
 49 * and pointed to by 32-bit jsvals on the stack and in object properties.
 50 */
 51
 52JS_BEGIN_EXTERN_C
 53
 54/*
 55 * The ARM architecture supports two floating point models: VFP and FPA. When
 56 * targetting FPA, doubles are mixed-endian on little endian ARMs (meaning that
 57 * the high and low words are in big endian order).
 58 */
 59#if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
 60#if !defined(__VFP_FP__)
 61#define FPU_IS_ARM_FPA
 62#endif
 63#endif
 64
 65typedef union jsdpun {
 66    struct {
 67#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
 68        uint32 lo, hi;
 69#else
 70        uint32 hi, lo;
 71#endif
 72    } s;
 73    uint64   u64;
 74    jsdouble d;
 75} jsdpun;
 76
 77#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
 78/*
 79 * This version of the macros is safe for the alias optimizations that gcc
 80 * does, but uses gcc-specific extensions.
 81 */
 82
 83#define JSDOUBLE_HI32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.hi; }))
 84#define JSDOUBLE_LO32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.lo; }))
 85#define JSDOUBLE_SET_HI32(x, y) \
 86    (__extension__ ({ jsdpun u; u.d = (x); u.s.hi = (y); (x) = u.d; }))
 87#define JSDOUBLE_SET_LO32(x, y) \
 88    (__extension__ ({ jsdpun u; u.d = (x); u.s.lo = (y); (x) = u.d; }))
 89
 90#else /* not or old GNUC */
 91
 92/*
 93 * We don't know of any non-gcc compilers that perform alias optimization,
 94 * so this code should work.
 95 */
 96
 97#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
 98#define JSDOUBLE_HI32(x)        (((uint32 *)&(x))[1])
 99#define JSDOUBLE_LO32(x)        (((uint32 *)&(x))[0])
100#else
101#define JSDOUBLE_HI32(x)        (((uint32 *)&(x))[0])
102#define JSDOUBLE_LO32(x)        (((uint32 *)&(x))[1])
103#endif
104
105#define JSDOUBLE_SET_HI32(x, y) (JSDOUBLE_HI32(x)=(y))
106#define JSDOUBLE_SET_LO32(x, y) (JSDOUBLE_LO32(x)=(y))
107
108#endif /* not or old GNUC */
109
110#define JSDOUBLE_HI32_SIGNBIT   0x80000000
111#define JSDOUBLE_HI32_EXPMASK   0x7ff00000
112#define JSDOUBLE_HI32_MANTMASK  0x000fffff
113
114#define JSDOUBLE_IS_NaN(x)                                                    \
115    ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK &&   \
116     (JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK)))
117
118#define JSDOUBLE_IS_INFINITE(x)                                               \
119    ((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK &&  \
120     !JSDOUBLE_LO32(x))
121
122#define JSDOUBLE_IS_FINITE(x)                                                 \
123    ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK)
124
125#define JSDOUBLE_IS_NEGZERO(d)  (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \
126                                 JSDOUBLE_LO32(d) == 0)
127
128/*
129 * JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid
130 * raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is
131 * safe) leaves i as (jsint)d.  This also avoid anomalous NaN floating point
132 * comparisons under MSVC.
133 */
134#define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d)                          \
135                               && !JSDOUBLE_IS_NEGZERO(d)                     \
136                               && ((d) == (i = (jsint)(d))))
137
138#if defined(XP_WIN)
139#define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN)                               \
140    ((JSDOUBLE_IS_NaN(LVAL) || JSDOUBLE_IS_NaN(RVAL))                         \
141     ? (IFNAN)                                                                \
142     : (LVAL) OP (RVAL))
143#else
144#define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN) ((LVAL) OP (RVAL))
145#endif
146
147extern jsdouble js_NaN;
148
149/* Initialize number constants and runtime state for the first context. */
150extern JSBool
151js_InitRuntimeNumberState(JSContext *cx);
152
153extern void
154js_TraceRuntimeNumberState(JSTracer *trc);
155
156extern void
157js_FinishRuntimeNumberState(JSContext *cx);
158
159/* Initialize the Number class, returning its prototype object. */
160extern JSClass js_NumberClass;
161
162extern JSObject *
163js_InitNumberClass(JSContext *cx, JSObject *obj);
164
165/*
166 * String constants for global function names, used in jsapi.c and jsnum.c.
167 */
168extern const char js_Infinity_str[];
169extern const char js_NaN_str[];
170extern const char js_isNaN_str[];
171extern const char js_isFinite_str[];
172extern const char js_parseFloat_str[];
173extern const char js_parseInt_str[];
174
175/*
176 * vp must be a root.
177 */
178extern JSBool
179js_NewNumberInRootedValue(JSContext *cx, jsdouble d, jsval *vp);
180
181/* Convert a number to a GC'ed string. */
182extern JSString * JS_FASTCALL
183js_NumberToString(JSContext *cx, jsdouble d);
184
185/*
186 * Convert int to C string. The buf must be big enough for MIN_INT to fit
187 * including '-' and '\0'.
188 */
189char *
190js_IntToCString(jsint i, jsint base, char *buf, size_t bufSize);
191
192/*
193 * Convert a number to C string. The buf must be at least
194 * DTOSTR_STANDARD_BUFFER_SIZE.
195 */
196char *
197js_NumberToCString(JSContext *cx, jsdouble d, jsint base, char *buf, size_t bufSize);
198
199/*
200 * Convert a value to a number. On exit JSVAL_IS_NULL(*vp) iff there was an
201 * error. If on exit JSVAL_IS_NUMBER(*vp), then *vp holds the jsval that
202 * matches the result. Otherwise *vp is JSVAL_TRUE indicating that the jsval
203 * for result has to be created explicitly using, for example, the
204 * js_NewNumberInRootedValue function.
205 */
206extern jsdouble
207js_ValueToNumber(JSContext *cx, jsval* vp);
208
209/*
210 * Convert a value to an int32 or uint32, according to the ECMA rules for
211 * ToInt32 and ToUint32. On exit JSVAL_IS_NULL(*vp) iff there was an error. If
212 * on exit JSVAL_IS_INT(*vp), then *vp holds the jsval matching the result.
213 * Otherwise *vp is JSVAL_TRUE indicating that the jsval for result has to be
214 * created explicitly using, for example, the js_NewNumberInRootedValue
215 * function.
216 */
217extern int32
218js_ValueToECMAInt32(JSContext *cx, jsval *vp);
219
220extern uint32
221js_ValueToECMAUint32(JSContext *cx, jsval *vp);
222
223/*
224 * Specialized ToInt32 and ToUint32 converters for doubles.
225 */
226extern int32
227js_DoubleToECMAInt32(jsdouble d);
228
229extern uint32
230js_DoubleToECMAUint32(jsdouble d);
231
232/*
233 * Convert a value to a number, then to an int32 if it fits by rounding to
234 * nearest; but failing with an error report if the double is out of range
235 * or unordered. On exit JSVAL_IS_NULL(*vp) iff there was an error. If on exit
236 * JSVAL_IS_INT(*vp), then *vp holds the jsval matching the result. Otherwise
237 * *vp is JSVAL_TRUE indicating that the jsval for result has to be created
238 * explicitly using, for example, the js_NewNumberInRootedValue function.
239 */
240extern int32
241js_ValueToInt32(JSContext *cx, jsval *vp);
242
243/*
244 * Convert a value to a number, then to a uint16 according to the ECMA rules
245 * for ToUint16. On exit JSVAL_IS_NULL(*vp) iff there was an error, otherwise
246 * vp is jsval matching the result.
247 */
248extern uint16
249js_ValueToUint16(JSContext *cx, jsval *vp);
250
251/*
252 * Convert a jsdouble to an integral number, stored in a jsdouble.
253 * If d is NaN, return 0.  If d is an infinity, return it without conversion.
254 */
255extern jsdouble
256js_DoubleToInteger(jsdouble d);
257
258/*
259 * Similar to strtod except that it replaces overflows with infinities of the
260 * correct sign, and underflows with zeros of the correct sign.  Guaranteed to
261 * return the closest double number to the given input in dp.
262 *
263 * Also allows inputs of the form [+|-]Infinity, which produce an infinity of
264 * the appropriate sign.  The case of the "Infinity" string must match exactly.
265 * If the string does not contain a number, set *ep to s and return 0.0 in dp.
266 * Return false if out of memory.
267 */
268extern JSBool
269js_strtod(JSContext *cx, const jschar *s, const jschar *send,
270          const jschar **ep, jsdouble *dp);
271
272/*
273 * Similar to strtol except that it handles integers of arbitrary size.
274 * Guaranteed to return the closest double number to the given input when radix
275 * is 10 or a power of 2.  Callers may see round-off errors for very large
276 * numbers of a different radix than 10 or a power of 2.
277 *
278 * If the string does not contain a number, set *ep to s and return 0.0 in dp.
279 * Return false if out of memory.
280 */
281extern JSBool
282js_strtointeger(JSContext *cx, const jschar *s, const jschar *send,
283                const jschar **ep, jsint radix, jsdouble *dp);
284
285JS_END_EXTERN_C
286
287#endif /* jsnum_h___ */