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Revision 72227035fe52ae825dac8760d8505dde64f041bf authored by Benjamin Peterson on 28 May 2009, 03:32:08 UTC, committed by Benjamin Peterson on 28 May 2009, 03:32:08 UTC
svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r72977 | benjamin.peterson | 2009-05-27 22:30:13 -0500 (Wed, 27 May 2009) | 9 lines Merged revisions 72971 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r72971 | benjamin.peterson | 2009-05-27 22:02:13 -0500 (Wed, 27 May 2009) | 1 line switch library reference and language reference ........ ................
1 parent dc020b1
longintrepr.h
#ifndef Py_LONGINTREPR_H
#define Py_LONGINTREPR_H
#ifdef __cplusplus
extern "C" {
#endif
/* This is published for the benefit of "friend" marshal.c only. */
/* Parameters of the long integer representation.
These shouldn't have to be changed as C should guarantee that a short
contains at least 16 bits, but it's made changeable anyway.
Note: 'digit' should be able to hold 2*MASK+1, and 'twodigits'
should be able to hold the intermediate results in 'mul'
(at most (BASE-1)*(2*BASE+1) == MASK*(2*MASK+3)).
Also, x_sub assumes that 'digit' is an unsigned type, and overflow
is handled by taking the result mod 2**N for some N > SHIFT.
And, at some places it is assumed that MASK fits in an int, as well.
long_pow() requires that SHIFT be divisible by 5. */
typedef unsigned short digit;
typedef unsigned int wdigit; /* digit widened to parameter size */
#define BASE_TWODIGITS_TYPE long
typedef unsigned BASE_TWODIGITS_TYPE twodigits;
typedef BASE_TWODIGITS_TYPE stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT 15
#define PyLong_BASE ((digit)1 << PyLong_SHIFT)
#define PyLong_MASK ((int)(PyLong_BASE - 1))
#if PyLong_SHIFT % 5 != 0
#error "longobject.c requires that SHIFT be divisible by 5"
#endif
/* Long integer representation.
The absolute value of a number is equal to
SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)
Negative numbers are represented with ob_size < 0;
zero is represented by ob_size == 0.
In a normalized number, ob_digit[abs(ob_size)-1] (the most significant
digit) is never zero. Also, in all cases, for all valid i,
0 <= ob_digit[i] <= MASK.
The allocation function takes care of allocating extra memory
so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.
CAUTION: Generic code manipulating subtypes of PyVarObject has to
aware that longs abuse ob_size's sign bit.
*/
struct _longobject {
PyObject_VAR_HEAD
digit ob_digit[1];
};
PyAPI_FUNC(PyLongObject *) _PyLong_New(Py_ssize_t);
/* Return a copy of src. */
PyAPI_FUNC(PyObject *) _PyLong_Copy(PyLongObject *src);
#ifdef __cplusplus
}
#endif
#endif /* !Py_LONGINTREPR_H */
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