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1.1 root 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: * When a JS number is treated as an object (followed by . or []), the runtime
51: * wraps it with a JSObject whose valueOf method returns the unwrapped number.
52: */
53:
54: JS_BEGIN_EXTERN_C
55:
56: /*
57: * Stefan Hanske <[email protected]> reports:
58: * ARM is a little endian architecture but 64 bit double words are stored
59: * differently: the 32 bit words are in little endian byte order, the two words
60: * are stored in big endian`s way.
61: */
62:
63: #if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
64: #define CPU_IS_ARM
65: #endif
66:
67: typedef union jsdpun {
68: struct {
69: #if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
1.1.1.2 ! root 70: uint32 lo, hi;
1.1 root 71: #else
1.1.1.2 ! root 72: uint32 hi, lo;
1.1 root 73: #endif
74: } s;
75: jsdouble d;
76: } jsdpun;
77:
78: #if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
79: /*
80: * This version of the macros is safe for the alias optimizations that gcc
81: * does, but uses gcc-specific extensions.
82: */
83:
84: #define JSDOUBLE_HI32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.hi; }))
85: #define JSDOUBLE_LO32(x) (__extension__ ({ jsdpun u; u.d = (x); u.s.lo; }))
86: #define JSDOUBLE_SET_HI32(x, y) \
87: (__extension__ ({ jsdpun u; u.d = (x); u.s.hi = (y); (x) = u.d; }))
88: #define JSDOUBLE_SET_LO32(x, y) \
89: (__extension__ ({ jsdpun u; u.d = (x); u.s.lo = (y); (x) = u.d; }))
90:
91: #else /* not or old GNUC */
92:
93: /*
94: * We don't know of any non-gcc compilers that perform alias optimization,
95: * so this code should work.
96: */
97:
98: #if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
99: #define JSDOUBLE_HI32(x) (((uint32 *)&(x))[1])
100: #define JSDOUBLE_LO32(x) (((uint32 *)&(x))[0])
101: #else
102: #define JSDOUBLE_HI32(x) (((uint32 *)&(x))[0])
103: #define JSDOUBLE_LO32(x) (((uint32 *)&(x))[1])
104: #endif
105:
106: #define JSDOUBLE_SET_HI32(x, y) (JSDOUBLE_HI32(x)=(y))
107: #define JSDOUBLE_SET_LO32(x, y) (JSDOUBLE_LO32(x)=(y))
108:
109: #endif /* not or old GNUC */
110:
111: #define JSDOUBLE_HI32_SIGNBIT 0x80000000
112: #define JSDOUBLE_HI32_EXPMASK 0x7ff00000
113: #define JSDOUBLE_HI32_MANTMASK 0x000fffff
114:
115: #define JSDOUBLE_IS_NaN(x) \
116: ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK && \
117: (JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK)))
118:
119: #define JSDOUBLE_IS_INFINITE(x) \
120: ((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK && \
121: !JSDOUBLE_LO32(x))
122:
123: #define JSDOUBLE_IS_FINITE(x) \
124: ((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK)
125:
126: #define JSDOUBLE_IS_NEGZERO(d) (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \
1.1.1.2 ! root 127: JSDOUBLE_LO32(d) == 0)
1.1 root 128:
129: /*
130: * JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid
131: * raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is
132: * safe) leaves i as (jsint)d. This also avoid anomalous NaN floating point
133: * comparisons under MSVC.
134: */
135: #define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d) \
136: && !JSDOUBLE_IS_NEGZERO(d) \
1.1.1.2 ! root 137: && ((d) == (i = (jsint)(d))))
! 138:
! 139: #if defined(XP_WIN)
! 140: #define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN) \
! 141: ((JSDOUBLE_IS_NaN(LVAL) || JSDOUBLE_IS_NaN(RVAL)) \
! 142: ? (IFNAN) \
! 143: : (LVAL) OP (RVAL))
! 144: #else
! 145: #define JSDOUBLE_COMPARE(LVAL, OP, RVAL, IFNAN) ((LVAL) OP (RVAL))
! 146: #endif
1.1 root 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_FinishRuntimeNumberState(JSContext *cx);
154:
155: /* Initialize the Number class, returning its prototype object. */
1.1.1.2 ! root 156: extern JSClass js_NumberClass;
! 157:
1.1 root 158: extern JSObject *
159: js_InitNumberClass(JSContext *cx, JSObject *obj);
160:
161: /*
162: * String constants for global function names, used in jsapi.c and jsnum.c.
163: */
164: extern const char js_Infinity_str[];
165: extern const char js_NaN_str[];
166: extern const char js_isNaN_str[];
167: extern const char js_isFinite_str[];
168: extern const char js_parseFloat_str[];
169: extern const char js_parseInt_str[];
170:
171: /* GC-allocate a new JS number. */
172: extern jsdouble *
1.1.1.2 ! root 173: js_NewDouble(JSContext *cx, jsdouble d, uintN gcflag);
1.1 root 174:
175: extern void
176: js_FinalizeDouble(JSContext *cx, jsdouble *dp);
177:
178: extern JSBool
179: js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval);
180:
181: extern JSBool
182: js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);
183:
184: /* Construct a Number instance that wraps around d. */
185: extern JSObject *
186: js_NumberToObject(JSContext *cx, jsdouble d);
187:
188: /* Convert a number to a GC'ed string. */
189: extern JSString *
190: js_NumberToString(JSContext *cx, jsdouble d);
191:
192: /*
193: * Convert a value to a number, returning false after reporting any error,
194: * otherwise returning true with *dp set.
195: */
196: extern JSBool
197: js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);
198:
199: /*
200: * Convert a value or a double to an int32, according to the ECMA rules
201: * for ToInt32.
202: */
203: extern JSBool
204: js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);
205:
206: extern JSBool
207: js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip);
208:
209: /*
210: * Convert a value or a double to a uint32, according to the ECMA rules
211: * for ToUint32.
212: */
213: extern JSBool
214: js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);
215:
216: extern JSBool
217: js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip);
218:
219: /*
220: * Convert a value to a number, then to an int32 if it fits by rounding to
221: * nearest; but failing with an error report if the double is out of range
222: * or unordered.
223: */
224: extern JSBool
225: js_ValueToInt32(JSContext *cx, jsval v, int32 *ip);
226:
227: /*
228: * Convert a value to a number, then to a uint16 according to the ECMA rules
229: * for ToUint16.
230: */
231: extern JSBool
232: js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);
233:
234: /*
235: * Convert a jsdouble to an integral number, stored in a jsdouble.
236: * If d is NaN, return 0. If d is an infinity, return it without conversion.
237: */
238: extern jsdouble
239: js_DoubleToInteger(jsdouble d);
240:
241: /*
242: * Similar to strtod except that it replaces overflows with infinities of the
243: * correct sign, and underflows with zeros of the correct sign. Guaranteed to
244: * return the closest double number to the given input in dp.
245: *
246: * Also allows inputs of the form [+|-]Infinity, which produce an infinity of
247: * the appropriate sign. The case of the "Infinity" string must match exactly.
248: * If the string does not contain a number, set *ep to s and return 0.0 in dp.
249: * Return false if out of memory.
250: */
251: extern JSBool
252: js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp);
253:
254: /*
255: * Similar to strtol except that it handles integers of arbitrary size.
256: * Guaranteed to return the closest double number to the given input when radix
257: * is 10 or a power of 2. Callers may see round-off errors for very large
258: * numbers of a different radix than 10 or a power of 2.
259: *
260: * If the string does not contain a number, set *ep to s and return 0.0 in dp.
261: * Return false if out of memory.
262: */
263: extern JSBool
264: js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint radix, jsdouble *dp);
265:
266: JS_END_EXTERN_C
267:
268: #endif /* jsnum_h___ */
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