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Annotation of sbbs/include/mozilla/js/jslong.h, revision 1.1

1.1     ! root        1: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
        !             2: /* ***** BEGIN LICENSE BLOCK *****
        !             3:  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
        !             4:  *
        !             5:  * The contents of this file are subject to the Mozilla Public License Version
        !             6:  * 1.1 (the "License"); you may not use this file except in compliance with
        !             7:  * the License. You may obtain a copy of the License at
        !             8:  * http://www.mozilla.org/MPL/
        !             9:  *
        !            10:  * Software distributed under the License is distributed on an "AS IS" basis,
        !            11:  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
        !            12:  * for the specific language governing rights and limitations under the
        !            13:  * License.
        !            14:  *
        !            15:  * The Original Code is Mozilla Communicator client code, released
        !            16:  * March 31, 1998.
        !            17:  *
        !            18:  * The Initial Developer of the Original Code is
        !            19:  * Netscape Communications Corporation.
        !            20:  * Portions created by the Initial Developer are Copyright (C) 1998
        !            21:  * the Initial Developer. All Rights Reserved.
        !            22:  *
        !            23:  * Contributor(s):
        !            24:  *
        !            25:  * Alternatively, the contents of this file may be used under the terms of
        !            26:  * either of the GNU General Public License Version 2 or later (the "GPL"),
        !            27:  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
        !            28:  * in which case the provisions of the GPL or the LGPL are applicable instead
        !            29:  * of those above. If you wish to allow use of your version of this file only
        !            30:  * under the terms of either the GPL or the LGPL, and not to allow others to
        !            31:  * use your version of this file under the terms of the MPL, indicate your
        !            32:  * decision by deleting the provisions above and replace them with the notice
        !            33:  * and other provisions required by the GPL or the LGPL. If you do not delete
        !            34:  * the provisions above, a recipient may use your version of this file under
        !            35:  * the terms of any one of the MPL, the GPL or the LGPL.
        !            36:  *
        !            37:  * ***** END LICENSE BLOCK ***** */
        !            38: 
        !            39: /*
        !            40: ** File:                jslong.h
        !            41: ** Description: Portable access to 64 bit numerics
        !            42: **
        !            43: ** Long-long (64-bit signed integer type) support. Some C compilers
        !            44: ** don't support 64 bit integers yet, so we use these macros to
        !            45: ** support both machines that do and don't.
        !            46: **/
        !            47: #ifndef jslong_h___
        !            48: #define jslong_h___
        !            49: 
        !            50: #include "jstypes.h"
        !            51: 
        !            52: JS_BEGIN_EXTERN_C
        !            53: 
        !            54: /***********************************************************************
        !            55: ** DEFINES:     JSLL_MaxInt
        !            56: **              JSLL_MinInt
        !            57: **              JSLL_Zero
        !            58: ** DESCRIPTION:
        !            59: **      Various interesting constants and static variable
        !            60: **      initializer
        !            61: ***********************************************************************/
        !            62: #ifdef HAVE_WATCOM_BUG_2
        !            63: JSInt64 __pascal __loadds __export
        !            64:     JSLL_MaxInt(void);
        !            65: JSInt64 __pascal __loadds __export
        !            66:     JSLL_MinInt(void);
        !            67: JSInt64 __pascal __loadds __export
        !            68:     JSLL_Zero(void);
        !            69: #else
        !            70: extern JS_PUBLIC_API(JSInt64) JSLL_MaxInt(void);
        !            71: extern JS_PUBLIC_API(JSInt64) JSLL_MinInt(void);
        !            72: extern JS_PUBLIC_API(JSInt64) JSLL_Zero(void);
        !            73: #endif
        !            74: 
        !            75: #define JSLL_MAXINT   JSLL_MaxInt()
        !            76: #define JSLL_MININT   JSLL_MinInt()
        !            77: #define JSLL_ZERO     JSLL_Zero()
        !            78: 
        !            79: #ifdef JS_HAVE_LONG_LONG
        !            80: 
        !            81: #if JS_BYTES_PER_LONG == 8
        !            82: #define JSLL_INIT(hi, lo)  ((hi ## L << 32) + lo ## L)
        !            83: #elif (defined(WIN32) || defined(WIN16)) && !defined(__GNUC__)
        !            84: #define JSLL_INIT(hi, lo)  ((hi ## i64 << 32) + lo ## i64)
        !            85: #else
        !            86: #define JSLL_INIT(hi, lo)  ((hi ## LL << 32) + lo ## LL)
        !            87: #endif
        !            88: 
        !            89: /***********************************************************************
        !            90: ** MACROS:      JSLL_*
        !            91: ** DESCRIPTION:
        !            92: **      The following macros define portable access to the 64 bit
        !            93: **      math facilities.
        !            94: **
        !            95: ***********************************************************************/
        !            96: 
        !            97: /***********************************************************************
        !            98: ** MACROS:      JSLL_<relational operators>
        !            99: **
        !           100: **  JSLL_IS_ZERO        Test for zero
        !           101: **  JSLL_EQ             Test for equality
        !           102: **  JSLL_NE             Test for inequality
        !           103: **  JSLL_GE_ZERO        Test for zero or positive
        !           104: **  JSLL_CMP            Compare two values
        !           105: ***********************************************************************/
        !           106: #define JSLL_IS_ZERO(a)       ((a) == 0)
        !           107: #define JSLL_EQ(a, b)         ((a) == (b))
        !           108: #define JSLL_NE(a, b)         ((a) != (b))
        !           109: #define JSLL_GE_ZERO(a)       ((a) >= 0)
        !           110: #define JSLL_CMP(a, op, b)    ((JSInt64)(a) op (JSInt64)(b))
        !           111: #define JSLL_UCMP(a, op, b)   ((JSUint64)(a) op (JSUint64)(b))
        !           112: 
        !           113: /***********************************************************************
        !           114: ** MACROS:      JSLL_<logical operators>
        !           115: **
        !           116: **  JSLL_AND            Logical and
        !           117: **  JSLL_OR             Logical or
        !           118: **  JSLL_XOR            Logical exclusion
        !           119: **  JSLL_OR2            A disgusting deviation
        !           120: **  JSLL_NOT            Negation (one's compliment)
        !           121: ***********************************************************************/
        !           122: #define JSLL_AND(r, a, b)        ((r) = (a) & (b))
        !           123: #define JSLL_OR(r, a, b)        ((r) = (a) | (b))
        !           124: #define JSLL_XOR(r, a, b)        ((r) = (a) ^ (b))
        !           125: #define JSLL_OR2(r, a)        ((r) = (r) | (a))
        !           126: #define JSLL_NOT(r, a)        ((r) = ~(a))
        !           127: 
        !           128: /***********************************************************************
        !           129: ** MACROS:      JSLL_<mathematical operators>
        !           130: **
        !           131: **  JSLL_NEG            Negation (two's compliment)
        !           132: **  JSLL_ADD            Summation (two's compliment)
        !           133: **  JSLL_SUB            Difference (two's compliment)
        !           134: ***********************************************************************/
        !           135: #define JSLL_NEG(r, a)        ((r) = -(a))
        !           136: #define JSLL_ADD(r, a, b)     ((r) = (a) + (b))
        !           137: #define JSLL_SUB(r, a, b)     ((r) = (a) - (b))
        !           138: 
        !           139: /***********************************************************************
        !           140: ** MACROS:      JSLL_<mathematical operators>
        !           141: **
        !           142: **  JSLL_MUL            Product (two's compliment)
        !           143: **  JSLL_DIV            Quotient (two's compliment)
        !           144: **  JSLL_MOD            Modulus (two's compliment)
        !           145: ***********************************************************************/
        !           146: #define JSLL_MUL(r, a, b)        ((r) = (a) * (b))
        !           147: #define JSLL_DIV(r, a, b)        ((r) = (a) / (b))
        !           148: #define JSLL_MOD(r, a, b)        ((r) = (a) % (b))
        !           149: 
        !           150: /***********************************************************************
        !           151: ** MACROS:      JSLL_<shifting operators>
        !           152: **
        !           153: **  JSLL_SHL            Shift left [0..64] bits
        !           154: **  JSLL_SHR            Shift right [0..64] bits with sign extension
        !           155: **  JSLL_USHR           Unsigned shift right [0..64] bits
        !           156: **  JSLL_ISHL           Signed shift left [0..64] bits
        !           157: ***********************************************************************/
        !           158: #define JSLL_SHL(r, a, b)     ((r) = (JSInt64)(a) << (b))
        !           159: #define JSLL_SHR(r, a, b)     ((r) = (JSInt64)(a) >> (b))
        !           160: #define JSLL_USHR(r, a, b)    ((r) = (JSUint64)(a) >> (b))
        !           161: #define JSLL_ISHL(r, a, b)    ((r) = (JSInt64)(a) << (b))
        !           162: 
        !           163: /***********************************************************************
        !           164: ** MACROS:      JSLL_<conversion operators>
        !           165: **
        !           166: **  JSLL_L2I            Convert to signed 32 bit
        !           167: **  JSLL_L2UI           Convert to unsigned 32 bit
        !           168: **  JSLL_L2F            Convert to floating point
        !           169: **  JSLL_L2D            Convert to floating point
        !           170: **  JSLL_I2L            Convert signed to 64 bit
        !           171: **  JSLL_UI2L           Convert unsigned to 64 bit
        !           172: **  JSLL_F2L            Convert float to 64 bit
        !           173: **  JSLL_D2L            Convert float to 64 bit
        !           174: ***********************************************************************/
        !           175: #define JSLL_L2I(i, l)        ((i) = (JSInt32)(l))
        !           176: #define JSLL_L2UI(ui, l)        ((ui) = (JSUint32)(l))
        !           177: #define JSLL_L2F(f, l)        ((f) = (JSFloat64)(l))
        !           178: #define JSLL_L2D(d, l)        ((d) = (JSFloat64)(l))
        !           179: 
        !           180: #define JSLL_I2L(l, i)        ((l) = (JSInt64)(i))
        !           181: #define JSLL_UI2L(l, ui)        ((l) = (JSInt64)(ui))
        !           182: #define JSLL_F2L(l, f)        ((l) = (JSInt64)(f))
        !           183: #define JSLL_D2L(l, d)        ((l) = (JSInt64)(d))
        !           184: 
        !           185: /***********************************************************************
        !           186: ** MACROS:      JSLL_UDIVMOD
        !           187: ** DESCRIPTION:
        !           188: **  Produce both a quotient and a remainder given an unsigned 
        !           189: ** INPUTS:      JSUint64 a: The dividend of the operation
        !           190: **              JSUint64 b: The quotient of the operation
        !           191: ** OUTPUTS:     JSUint64 *qp: pointer to quotient
        !           192: **              JSUint64 *rp: pointer to remainder
        !           193: ***********************************************************************/
        !           194: #define JSLL_UDIVMOD(qp, rp, a, b) \
        !           195:     (*(qp) = ((JSUint64)(a) / (b)), \
        !           196:      *(rp) = ((JSUint64)(a) % (b)))
        !           197: 
        !           198: #else  /* !JS_HAVE_LONG_LONG */
        !           199: 
        !           200: #ifdef IS_LITTLE_ENDIAN
        !           201: #define JSLL_INIT(hi, lo) {JS_INT32(lo), JS_INT32(hi)}
        !           202: #else
        !           203: #define JSLL_INIT(hi, lo) {JS_INT32(hi), JS_INT32(lo)}
        !           204: #endif
        !           205: 
        !           206: #define JSLL_IS_ZERO(a)         (((a).hi == 0) && ((a).lo == 0))
        !           207: #define JSLL_EQ(a, b)           (((a).hi == (b).hi) && ((a).lo == (b).lo))
        !           208: #define JSLL_NE(a, b)           (((a).hi != (b).hi) || ((a).lo != (b).lo))
        !           209: #define JSLL_GE_ZERO(a)         (((a).hi >> 31) == 0)
        !           210: 
        !           211: #ifdef DEBUG
        !           212: #define JSLL_CMP(a, op, b)      (JS_ASSERT((#op)[1] != '='), JSLL_REAL_CMP(a, op, b))
        !           213: #define JSLL_UCMP(a, op, b)     (JS_ASSERT((#op)[1] != '='), JSLL_REAL_UCMP(a, op, b))
        !           214: #else
        !           215: #define JSLL_CMP(a, op, b)      JSLL_REAL_CMP(a, op, b)
        !           216: #define JSLL_UCMP(a, op, b)     JSLL_REAL_UCMP(a, op, b)
        !           217: #endif
        !           218: 
        !           219: #define JSLL_REAL_CMP(a,op,b)   (((JSInt32)(a).hi op (JSInt32)(b).hi) || \
        !           220:                                  (((a).hi == (b).hi) && ((a).lo op (b).lo)))
        !           221: #define JSLL_REAL_UCMP(a,op,b)  (((a).hi op (b).hi) || \
        !           222:                                  (((a).hi == (b).hi) && ((a).lo op (b).lo)))
        !           223: 
        !           224: #define JSLL_AND(r, a, b)       ((r).lo = (a).lo & (b).lo, \
        !           225:                                  (r).hi = (a).hi & (b).hi)
        !           226: #define JSLL_OR(r, a, b)        ((r).lo = (a).lo | (b).lo, \
        !           227:                                  (r).hi = (a).hi | (b).hi)
        !           228: #define JSLL_XOR(r, a, b)       ((r).lo = (a).lo ^ (b).lo, \
        !           229:                                  (r).hi = (a).hi ^ (b).hi)
        !           230: #define JSLL_OR2(r, a)          ((r).lo = (r).lo | (a).lo, \
        !           231:                                  (r).hi = (r).hi | (a).hi)
        !           232: #define JSLL_NOT(r, a)          ((r).lo = ~(a).lo, \
        !           233:                                  (r).hi = ~(a).hi)
        !           234: 
        !           235: #define JSLL_NEG(r, a)          ((r).lo = -(JSInt32)(a).lo, \
        !           236:                                  (r).hi = -(JSInt32)(a).hi - ((r).lo != 0))
        !           237: #define JSLL_ADD(r, a, b) { \
        !           238:     JSInt64 _a, _b; \
        !           239:     _a = a; _b = b; \
        !           240:     (r).lo = _a.lo + _b.lo; \
        !           241:     (r).hi = _a.hi + _b.hi + ((r).lo < _b.lo); \
        !           242: }
        !           243: 
        !           244: #define JSLL_SUB(r, a, b) { \
        !           245:     JSInt64 _a, _b; \
        !           246:     _a = a; _b = b; \
        !           247:     (r).lo = _a.lo - _b.lo; \
        !           248:     (r).hi = _a.hi - _b.hi - (_a.lo < _b.lo); \
        !           249: }
        !           250: 
        !           251: #define JSLL_MUL(r, a, b) { \
        !           252:     JSInt64 _a, _b; \
        !           253:     _a = a; _b = b; \
        !           254:     JSLL_MUL32(r, _a.lo, _b.lo); \
        !           255:     (r).hi += _a.hi * _b.lo + _a.lo * _b.hi; \
        !           256: }
        !           257: 
        !           258: #define jslo16(a)        ((a) & JS_BITMASK(16))
        !           259: #define jshi16(a)        ((a) >> 16)
        !           260: 
        !           261: #define JSLL_MUL32(r, a, b) { \
        !           262:      JSUint32 _a1, _a0, _b1, _b0, _y0, _y1, _y2, _y3; \
        !           263:      _a1 = jshi16(a), _a0 = jslo16(a); \
        !           264:      _b1 = jshi16(b), _b0 = jslo16(b); \
        !           265:      _y0 = _a0 * _b0; \
        !           266:      _y1 = _a0 * _b1; \
        !           267:      _y2 = _a1 * _b0; \
        !           268:      _y3 = _a1 * _b1; \
        !           269:      _y1 += jshi16(_y0);                         /* can't carry */ \
        !           270:      _y1 += _y2;                                /* might carry */ \
        !           271:      if (_y1 < _y2)    \
        !           272:         _y3 += (JSUint32)(JS_BIT(16));  /* propagate */ \
        !           273:      (r).lo = (jslo16(_y1) << 16) + jslo16(_y0); \
        !           274:      (r).hi = _y3 + jshi16(_y1); \
        !           275: }
        !           276: 
        !           277: #define JSLL_UDIVMOD(qp, rp, a, b)    jsll_udivmod(qp, rp, a, b)
        !           278: 
        !           279: extern JS_PUBLIC_API(void) jsll_udivmod(JSUint64 *qp, JSUint64 *rp, JSUint64 a, JSUint64 b);
        !           280: 
        !           281: #define JSLL_DIV(r, a, b) { \
        !           282:     JSInt64 _a, _b; \
        !           283:     JSUint32 _negative = (JSInt32)(a).hi < 0; \
        !           284:     if (_negative) { \
        !           285:     JSLL_NEG(_a, a); \
        !           286:     } else { \
        !           287:     _a = a; \
        !           288:     } \
        !           289:     if ((JSInt32)(b).hi < 0) { \
        !           290:     _negative ^= 1; \
        !           291:     JSLL_NEG(_b, b); \
        !           292:     } else { \
        !           293:     _b = b; \
        !           294:     } \
        !           295:     JSLL_UDIVMOD(&(r), 0, _a, _b); \
        !           296:     if (_negative) \
        !           297:     JSLL_NEG(r, r); \
        !           298: }
        !           299: 
        !           300: #define JSLL_MOD(r, a, b) { \
        !           301:     JSInt64 _a, _b; \
        !           302:     JSUint32 _negative = (JSInt32)(a).hi < 0; \
        !           303:     if (_negative) { \
        !           304:     JSLL_NEG(_a, a); \
        !           305:     } else { \
        !           306:     _a = a; \
        !           307:     } \
        !           308:     if ((JSInt32)(b).hi < 0) { \
        !           309:     JSLL_NEG(_b, b); \
        !           310:     } else { \
        !           311:     _b = b; \
        !           312:     } \
        !           313:     JSLL_UDIVMOD(0, &(r), _a, _b); \
        !           314:     if (_negative) \
        !           315:     JSLL_NEG(r, r); \
        !           316: }
        !           317: 
        !           318: #define JSLL_SHL(r, a, b) { \
        !           319:     if (b) { \
        !           320:     JSInt64 _a; \
        !           321:         _a = a; \
        !           322:         if ((b) < 32) { \
        !           323:         (r).lo = _a.lo << ((b) & 31); \
        !           324:         (r).hi = (_a.hi << ((b) & 31)) | (_a.lo >> (32 - (b))); \
        !           325:     } else { \
        !           326:         (r).lo = 0; \
        !           327:         (r).hi = _a.lo << ((b) & 31); \
        !           328:     } \
        !           329:     } else { \
        !           330:     (r) = (a); \
        !           331:     } \
        !           332: }
        !           333: 
        !           334: /* a is an JSInt32, b is JSInt32, r is JSInt64 */
        !           335: #define JSLL_ISHL(r, a, b) { \
        !           336:     if (b) { \
        !           337:     JSInt64 _a; \
        !           338:     _a.lo = (a); \
        !           339:     _a.hi = 0; \
        !           340:         if ((b) < 32) { \
        !           341:         (r).lo = (a) << ((b) & 31); \
        !           342:         (r).hi = ((a) >> (32 - (b))); \
        !           343:     } else { \
        !           344:         (r).lo = 0; \
        !           345:         (r).hi = (a) << ((b) & 31); \
        !           346:     } \
        !           347:     } else { \
        !           348:     (r).lo = (a); \
        !           349:     (r).hi = 0; \
        !           350:     } \
        !           351: }
        !           352: 
        !           353: #define JSLL_SHR(r, a, b) { \
        !           354:     if (b) { \
        !           355:     JSInt64 _a; \
        !           356:         _a = a; \
        !           357:     if ((b) < 32) { \
        !           358:         (r).lo = (_a.hi << (32 - (b))) | (_a.lo >> ((b) & 31)); \
        !           359:         (r).hi = (JSInt32)_a.hi >> ((b) & 31); \
        !           360:     } else { \
        !           361:         (r).lo = (JSInt32)_a.hi >> ((b) & 31); \
        !           362:         (r).hi = (JSInt32)_a.hi >> 31; \
        !           363:     } \
        !           364:     } else { \
        !           365:     (r) = (a); \
        !           366:     } \
        !           367: }
        !           368: 
        !           369: #define JSLL_USHR(r, a, b) { \
        !           370:     if (b) { \
        !           371:     JSInt64 _a; \
        !           372:         _a = a; \
        !           373:     if ((b) < 32) { \
        !           374:         (r).lo = (_a.hi << (32 - (b))) | (_a.lo >> ((b) & 31)); \
        !           375:         (r).hi = _a.hi >> ((b) & 31); \
        !           376:     } else { \
        !           377:         (r).lo = _a.hi >> ((b) & 31); \
        !           378:         (r).hi = 0; \
        !           379:     } \
        !           380:     } else { \
        !           381:     (r) = (a); \
        !           382:     } \
        !           383: }
        !           384: 
        !           385: #define JSLL_L2I(i, l)        ((i) = (l).lo)
        !           386: #define JSLL_L2UI(ui, l)        ((ui) = (l).lo)
        !           387: #define JSLL_L2F(f, l)        { double _d; JSLL_L2D(_d, l); (f) = (JSFloat64)_d; }
        !           388: 
        !           389: #define JSLL_L2D(d, l) { \
        !           390:     int _negative; \
        !           391:     JSInt64 _absval; \
        !           392:  \
        !           393:     _negative = (l).hi >> 31; \
        !           394:     if (_negative) { \
        !           395:     JSLL_NEG(_absval, l); \
        !           396:     } else { \
        !           397:     _absval = l; \
        !           398:     } \
        !           399:     (d) = (double)_absval.hi * 4.294967296e9 + _absval.lo; \
        !           400:     if (_negative) \
        !           401:     (d) = -(d); \
        !           402: }
        !           403: 
        !           404: #define JSLL_I2L(l, i)        { JSInt32 _i = (i) >> 31; (l).lo = (i); (l).hi = _i; }
        !           405: #define JSLL_UI2L(l, ui)      ((l).lo = (ui), (l).hi = 0)
        !           406: #define JSLL_F2L(l, f)        { double _d = (double)f; JSLL_D2L(l, _d); }
        !           407: 
        !           408: #define JSLL_D2L(l, d) { \
        !           409:     int _negative; \
        !           410:     double _absval, _d_hi; \
        !           411:     JSInt64 _lo_d; \
        !           412:  \
        !           413:     _negative = ((d) < 0); \
        !           414:     _absval = _negative ? -(d) : (d); \
        !           415:  \
        !           416:     (l).hi = _absval / 4.294967296e9; \
        !           417:     (l).lo = 0; \
        !           418:     JSLL_L2D(_d_hi, l); \
        !           419:     _absval -= _d_hi; \
        !           420:     _lo_d.hi = 0; \
        !           421:     if (_absval < 0) { \
        !           422:     _lo_d.lo = -_absval; \
        !           423:     JSLL_SUB(l, l, _lo_d); \
        !           424:     } else { \
        !           425:     _lo_d.lo = _absval; \
        !           426:     JSLL_ADD(l, l, _lo_d); \
        !           427:     } \
        !           428:  \
        !           429:     if (_negative) \
        !           430:     JSLL_NEG(l, l); \
        !           431: }
        !           432: 
        !           433: #endif /* !JS_HAVE_LONG_LONG */
        !           434: 
        !           435: JS_END_EXTERN_C
        !           436: 
        !           437: #endif /* jslong_h___ */

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