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Contents of /trunk/js/jsnum.h

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Revision 332 - (show annotations)
Thu Oct 23 19:03:33 2008 UTC (12 years ago) by siliconforks
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File size: 10223 byte(s)
Add SpiderMonkey from Firefox 3.1b1.

The following directories and files were removed:
correct/, correct.js
liveconnect/
nanojit/
t/
v8/
vprof/
xpconnect/
all JavaScript files (Y.js, call.js, if.js, math-partial-sums.js, md5.js, perfect.js, trace-test.js, trace.js)


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

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