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1 siliconforks 332 /* -*- 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 siliconforks 399
43 siliconforks 332 /*
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    
52     JS_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    
65     typedef 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    
147     extern jsdouble js_NaN;
148    
149     /* Initialize number constants and runtime state for the first context. */
150     extern JSBool
151     js_InitRuntimeNumberState(JSContext *cx);
152    
153     extern void
154     js_TraceRuntimeNumberState(JSTracer *trc);
155    
156     extern void
157     js_FinishRuntimeNumberState(JSContext *cx);
158    
159     /* Initialize the Number class, returning its prototype object. */
160     extern JSClass js_NumberClass;
161    
162     extern JSObject *
163     js_InitNumberClass(JSContext *cx, JSObject *obj);
164    
165     /*
166     * String constants for global function names, used in jsapi.c and jsnum.c.
167     */
168     extern const char js_Infinity_str[];
169     extern const char js_NaN_str[];
170     extern const char js_isNaN_str[];
171     extern const char js_isFinite_str[];
172     extern const char js_parseFloat_str[];
173     extern const char js_parseInt_str[];
174    
175     /*
176     * vp must be a root.
177     */
178     extern JSBool
179     js_NewNumberInRootedValue(JSContext *cx, jsdouble d, jsval *vp);
180    
181 siliconforks 460 /*
182     * Create a weakly rooted integer or double jsval as appropriate for the given
183     * jsdouble.
184     */
185     extern JSBool
186     js_NewWeaklyRootedNumber(JSContext *cx, jsdouble d, jsval *vp);
187    
188 siliconforks 332 /* Convert a number to a GC'ed string. */
189     extern JSString * JS_FASTCALL
190     js_NumberToString(JSContext *cx, jsdouble d);
191    
192     /*
193     * Convert a value to a number. On exit JSVAL_IS_NULL(*vp) iff there was an
194     * error. If on exit JSVAL_IS_NUMBER(*vp), then *vp holds the jsval that
195     * matches the result. Otherwise *vp is JSVAL_TRUE indicating that the jsval
196     * for result has to be created explicitly using, for example, the
197     * js_NewNumberInRootedValue function.
198     */
199     extern jsdouble
200     js_ValueToNumber(JSContext *cx, jsval* vp);
201    
202     /*
203     * Convert a value to an int32 or uint32, according to the ECMA rules for
204     * ToInt32 and ToUint32. On exit JSVAL_IS_NULL(*vp) iff there was an error. If
205     * on exit JSVAL_IS_INT(*vp), then *vp holds the jsval matching the result.
206     * Otherwise *vp is JSVAL_TRUE indicating that the jsval for result has to be
207     * created explicitly using, for example, the js_NewNumberInRootedValue
208     * function.
209     */
210     extern int32
211     js_ValueToECMAInt32(JSContext *cx, jsval *vp);
212    
213     extern uint32
214     js_ValueToECMAUint32(JSContext *cx, jsval *vp);
215    
216     /*
217     * Specialized ToInt32 and ToUint32 converters for doubles.
218     */
219     extern int32
220     js_DoubleToECMAInt32(jsdouble d);
221    
222     extern uint32
223     js_DoubleToECMAUint32(jsdouble d);
224    
225     /*
226     * Convert a value to a number, then to an int32 if it fits by rounding to
227     * nearest; but failing with an error report if the double is out of range
228     * or unordered. On exit JSVAL_IS_NULL(*vp) iff there was an error. If on exit
229     * JSVAL_IS_INT(*vp), then *vp holds the jsval matching the result. Otherwise
230     * *vp is JSVAL_TRUE indicating that the jsval for result has to be created
231     * explicitly using, for example, the js_NewNumberInRootedValue function.
232     */
233     extern int32
234     js_ValueToInt32(JSContext *cx, jsval *vp);
235    
236     /*
237     * Convert a value to a number, then to a uint16 according to the ECMA rules
238     * for ToUint16. On exit JSVAL_IS_NULL(*vp) iff there was an error, otherwise
239     * vp is jsval matching the result.
240     */
241     extern uint16
242     js_ValueToUint16(JSContext *cx, jsval *vp);
243    
244     /*
245     * Convert a jsdouble to an integral number, stored in a jsdouble.
246     * If d is NaN, return 0. If d is an infinity, return it without conversion.
247     */
248     extern jsdouble
249     js_DoubleToInteger(jsdouble d);
250    
251     /*
252     * Similar to strtod except that it replaces overflows with infinities of the
253     * correct sign, and underflows with zeros of the correct sign. Guaranteed to
254     * return the closest double number to the given input in dp.
255     *
256     * Also allows inputs of the form [+|-]Infinity, which produce an infinity of
257     * the appropriate sign. The case of the "Infinity" string must match exactly.
258     * If the string does not contain a number, set *ep to s and return 0.0 in dp.
259     * Return false if out of memory.
260     */
261     extern JSBool
262     js_strtod(JSContext *cx, const jschar *s, const jschar *send,
263     const jschar **ep, jsdouble *dp);
264    
265     /*
266     * Similar to strtol except that it handles integers of arbitrary size.
267     * Guaranteed to return the closest double number to the given input when radix
268     * is 10 or a power of 2. Callers may see round-off errors for very large
269     * numbers of a different radix than 10 or a power of 2.
270     *
271     * If the string does not contain a number, set *ep to s and return 0.0 in dp.
272     * Return false if out of memory.
273     */
274     extern JSBool
275     js_strtointeger(JSContext *cx, const jschar *s, const jschar *send,
276     const jschar **ep, jsint radix, jsdouble *dp);
277    
278     JS_END_EXTERN_C
279    
280     #endif /* jsnum_h___ */

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