ref: 678be8399090b9eb90f983b1b4105495893f57f1
dir: /sys/src/cmd/python/Objects/intobject.c/
/* Integer object implementation */
#include "Python.h"
#include <ctype.h>
long
PyInt_GetMax(void)
{
return LONG_MAX; /* To initialize sys.maxint */
}
/* Integers are quite normal objects, to make object handling uniform.
(Using odd pointers to represent integers would save much space
but require extra checks for this special case throughout the code.)
Since a typical Python program spends much of its time allocating
and deallocating integers, these operations should be very fast.
Therefore we use a dedicated allocation scheme with a much lower
overhead (in space and time) than straight malloc(): a simple
dedicated free list, filled when necessary with memory from malloc().
block_list is a singly-linked list of all PyIntBlocks ever allocated,
linked via their next members. PyIntBlocks are never returned to the
system before shutdown (PyInt_Fini).
free_list is a singly-linked list of available PyIntObjects, linked
via abuse of their ob_type members.
*/
#define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */
#define BHEAD_SIZE 8 /* Enough for a 64-bit pointer */
#define N_INTOBJECTS ((BLOCK_SIZE - BHEAD_SIZE) / sizeof(PyIntObject))
struct _intblock {
struct _intblock *next;
PyIntObject objects[N_INTOBJECTS];
};
typedef struct _intblock PyIntBlock;
static PyIntBlock *block_list = NULL;
static PyIntObject *free_list = NULL;
static PyIntObject *
fill_free_list(void)
{
PyIntObject *p, *q;
/* Python's object allocator isn't appropriate for large blocks. */
p = (PyIntObject *) PyMem_MALLOC(sizeof(PyIntBlock));
if (p == NULL)
return (PyIntObject *) PyErr_NoMemory();
((PyIntBlock *)p)->next = block_list;
block_list = (PyIntBlock *)p;
/* Link the int objects together, from rear to front, then return
the address of the last int object in the block. */
p = &((PyIntBlock *)p)->objects[0];
q = p + N_INTOBJECTS;
while (--q > p)
q->ob_type = (struct _typeobject *)(q-1);
q->ob_type = NULL;
return p + N_INTOBJECTS - 1;
}
#ifndef NSMALLPOSINTS
#define NSMALLPOSINTS 257
#endif
#ifndef NSMALLNEGINTS
#define NSMALLNEGINTS 5
#endif
#if NSMALLNEGINTS + NSMALLPOSINTS > 0
/* References to small integers are saved in this array so that they
can be shared.
The integers that are saved are those in the range
-NSMALLNEGINTS (inclusive) to NSMALLPOSINTS (not inclusive).
*/
static PyIntObject *small_ints[NSMALLNEGINTS + NSMALLPOSINTS];
#endif
#ifdef COUNT_ALLOCS
int quick_int_allocs, quick_neg_int_allocs;
#endif
PyObject *
PyInt_FromLong(long ival)
{
register PyIntObject *v;
#if NSMALLNEGINTS + NSMALLPOSINTS > 0
if (-NSMALLNEGINTS <= ival && ival < NSMALLPOSINTS) {
v = small_ints[ival + NSMALLNEGINTS];
Py_INCREF(v);
#ifdef COUNT_ALLOCS
if (ival >= 0)
quick_int_allocs++;
else
quick_neg_int_allocs++;
#endif
return (PyObject *) v;
}
#endif
if (free_list == NULL) {
if ((free_list = fill_free_list()) == NULL)
return NULL;
}
/* Inline PyObject_New */
v = free_list;
free_list = (PyIntObject *)v->ob_type;
PyObject_INIT(v, &PyInt_Type);
v->ob_ival = ival;
return (PyObject *) v;
}
PyObject *
PyInt_FromSize_t(size_t ival)
{
if (ival <= LONG_MAX)
return PyInt_FromLong((long)ival);
return _PyLong_FromSize_t(ival);
}
PyObject *
PyInt_FromSsize_t(Py_ssize_t ival)
{
if (ival >= LONG_MIN && ival <= LONG_MAX)
return PyInt_FromLong((long)ival);
return _PyLong_FromSsize_t(ival);
}
static void
int_dealloc(PyIntObject *v)
{
if (PyInt_CheckExact(v)) {
v->ob_type = (struct _typeobject *)free_list;
free_list = v;
}
else
v->ob_type->tp_free((PyObject *)v);
}
static void
int_free(PyIntObject *v)
{
v->ob_type = (struct _typeobject *)free_list;
free_list = v;
}
long
PyInt_AsLong(register PyObject *op)
{
PyNumberMethods *nb;
PyIntObject *io;
long val;
if (op && PyInt_Check(op))
return PyInt_AS_LONG((PyIntObject*) op);
if (op == NULL || (nb = op->ob_type->tp_as_number) == NULL ||
nb->nb_int == NULL) {
PyErr_SetString(PyExc_TypeError, "an integer is required");
return -1;
}
io = (PyIntObject*) (*nb->nb_int) (op);
if (io == NULL)
return -1;
if (!PyInt_Check(io)) {
if (PyLong_Check(io)) {
/* got a long? => retry int conversion */
val = PyLong_AsLong((PyObject *)io);
Py_DECREF(io);
if ((val == -1) && PyErr_Occurred())
return -1;
return val;
}
else
{
Py_DECREF(io);
PyErr_SetString(PyExc_TypeError,
"nb_int should return int object");
return -1;
}
}
val = PyInt_AS_LONG(io);
Py_DECREF(io);
return val;
}
Py_ssize_t
PyInt_AsSsize_t(register PyObject *op)
{
#if SIZEOF_SIZE_T != SIZEOF_LONG
PyNumberMethods *nb;
PyIntObject *io;
Py_ssize_t val;
#endif
if (op == NULL) {
PyErr_SetString(PyExc_TypeError, "an integer is required");
return -1;
}
if (PyInt_Check(op))
return PyInt_AS_LONG((PyIntObject*) op);
if (PyLong_Check(op))
return _PyLong_AsSsize_t(op);
#if SIZEOF_SIZE_T == SIZEOF_LONG
return PyInt_AsLong(op);
#else
if ((nb = op->ob_type->tp_as_number) == NULL ||
(nb->nb_int == NULL && nb->nb_long == 0)) {
PyErr_SetString(PyExc_TypeError, "an integer is required");
return -1;
}
if (nb->nb_long != 0) {
io = (PyIntObject*) (*nb->nb_long) (op);
} else {
io = (PyIntObject*) (*nb->nb_int) (op);
}
if (io == NULL)
return -1;
if (!PyInt_Check(io)) {
if (PyLong_Check(io)) {
/* got a long? => retry int conversion */
val = _PyLong_AsSsize_t((PyObject *)io);
Py_DECREF(io);
if ((val == -1) && PyErr_Occurred())
return -1;
return val;
}
else
{
Py_DECREF(io);
PyErr_SetString(PyExc_TypeError,
"nb_int should return int object");
return -1;
}
}
val = PyInt_AS_LONG(io);
Py_DECREF(io);
return val;
#endif
}
unsigned long
PyInt_AsUnsignedLongMask(register PyObject *op)
{
PyNumberMethods *nb;
PyIntObject *io;
unsigned long val;
if (op && PyInt_Check(op))
return PyInt_AS_LONG((PyIntObject*) op);
if (op && PyLong_Check(op))
return PyLong_AsUnsignedLongMask(op);
if (op == NULL || (nb = op->ob_type->tp_as_number) == NULL ||
nb->nb_int == NULL) {
PyErr_SetString(PyExc_TypeError, "an integer is required");
return (unsigned long)-1;
}
io = (PyIntObject*) (*nb->nb_int) (op);
if (io == NULL)
return (unsigned long)-1;
if (!PyInt_Check(io)) {
if (PyLong_Check(io)) {
val = PyLong_AsUnsignedLongMask((PyObject *)io);
Py_DECREF(io);
if (PyErr_Occurred())
return (unsigned long)-1;
return val;
}
else
{
Py_DECREF(io);
PyErr_SetString(PyExc_TypeError,
"nb_int should return int object");
return (unsigned long)-1;
}
}
val = PyInt_AS_LONG(io);
Py_DECREF(io);
return val;
}
#ifdef HAVE_LONG_LONG
unsigned PY_LONG_LONG
PyInt_AsUnsignedLongLongMask(register PyObject *op)
{
PyNumberMethods *nb;
PyIntObject *io;
unsigned PY_LONG_LONG val;
if (op && PyInt_Check(op))
return PyInt_AS_LONG((PyIntObject*) op);
if (op && PyLong_Check(op))
return PyLong_AsUnsignedLongLongMask(op);
if (op == NULL || (nb = op->ob_type->tp_as_number) == NULL ||
nb->nb_int == NULL) {
PyErr_SetString(PyExc_TypeError, "an integer is required");
return (unsigned PY_LONG_LONG)-1;
}
io = (PyIntObject*) (*nb->nb_int) (op);
if (io == NULL)
return (unsigned PY_LONG_LONG)-1;
if (!PyInt_Check(io)) {
if (PyLong_Check(io)) {
val = PyLong_AsUnsignedLongLongMask((PyObject *)io);
Py_DECREF(io);
if (PyErr_Occurred())
return (unsigned PY_LONG_LONG)-1;
return val;
}
else
{
Py_DECREF(io);
PyErr_SetString(PyExc_TypeError,
"nb_int should return int object");
return (unsigned PY_LONG_LONG)-1;
}
}
val = PyInt_AS_LONG(io);
Py_DECREF(io);
return val;
}
#endif
PyObject *
PyInt_FromString(char *s, char **pend, int base)
{
char *end;
long x;
Py_ssize_t slen;
PyObject *sobj, *srepr;
if ((base != 0 && base < 2) || base > 36) {
PyErr_SetString(PyExc_ValueError,
"int() base must be >= 2 and <= 36");
return NULL;
}
while (*s && isspace(Py_CHARMASK(*s)))
s++;
errno = 0;
if (base == 0 && s[0] == '0') {
x = (long) PyOS_strtoul(s, &end, base);
if (x < 0)
return PyLong_FromString(s, pend, base);
}
else
x = PyOS_strtol(s, &end, base);
if (end == s || !isalnum(Py_CHARMASK(end[-1])))
goto bad;
while (*end && isspace(Py_CHARMASK(*end)))
end++;
if (*end != '\0') {
bad:
slen = strlen(s) < 200 ? strlen(s) : 200;
sobj = PyString_FromStringAndSize(s, slen);
if (sobj == NULL)
return NULL;
srepr = PyObject_Repr(sobj);
Py_DECREF(sobj);
if (srepr == NULL)
return NULL;
PyErr_Format(PyExc_ValueError,
"invalid literal for int() with base %d: %s",
base, PyString_AS_STRING(srepr));
Py_DECREF(srepr);
return NULL;
}
else if (errno != 0)
return PyLong_FromString(s, pend, base);
if (pend)
*pend = end;
return PyInt_FromLong(x);
}
#ifdef Py_USING_UNICODE
PyObject *
PyInt_FromUnicode(Py_UNICODE *s, Py_ssize_t length, int base)
{
PyObject *result;
char *buffer = (char *)PyMem_MALLOC(length+1);
if (buffer == NULL)
return NULL;
if (PyUnicode_EncodeDecimal(s, length, buffer, NULL)) {
PyMem_FREE(buffer);
return NULL;
}
result = PyInt_FromString(buffer, NULL, base);
PyMem_FREE(buffer);
return result;
}
#endif
/* Methods */
/* Integers are seen as the "smallest" of all numeric types and thus
don't have any knowledge about conversion of other types to
integers. */
#define CONVERT_TO_LONG(obj, lng) \
if (PyInt_Check(obj)) { \
lng = PyInt_AS_LONG(obj); \
} \
else { \
Py_INCREF(Py_NotImplemented); \
return Py_NotImplemented; \
}
/* ARGSUSED */
static int
int_print(PyIntObject *v, FILE *fp, int flags)
/* flags -- not used but required by interface */
{
fprintf(fp, "%ld", v->ob_ival);
return 0;
}
static PyObject *
int_repr(PyIntObject *v)
{
char buf[64];
PyOS_snprintf(buf, sizeof(buf), "%ld", v->ob_ival);
return PyString_FromString(buf);
}
static int
int_compare(PyIntObject *v, PyIntObject *w)
{
register long i = v->ob_ival;
register long j = w->ob_ival;
return (i < j) ? -1 : (i > j) ? 1 : 0;
}
static long
int_hash(PyIntObject *v)
{
/* XXX If this is changed, you also need to change the way
Python's long, float and complex types are hashed. */
long x = v -> ob_ival;
if (x == -1)
x = -2;
return x;
}
static PyObject *
int_add(PyIntObject *v, PyIntObject *w)
{
register long a, b, x;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
x = a + b;
if ((x^a) >= 0 || (x^b) >= 0)
return PyInt_FromLong(x);
return PyLong_Type.tp_as_number->nb_add((PyObject *)v, (PyObject *)w);
}
static PyObject *
int_sub(PyIntObject *v, PyIntObject *w)
{
register long a, b, x;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
x = a - b;
if ((x^a) >= 0 || (x^~b) >= 0)
return PyInt_FromLong(x);
return PyLong_Type.tp_as_number->nb_subtract((PyObject *)v,
(PyObject *)w);
}
/*
Integer overflow checking for * is painful: Python tried a couple ways, but
they didn't work on all platforms, or failed in endcases (a product of
-sys.maxint-1 has been a particular pain).
Here's another way:
The native long product x*y is either exactly right or *way* off, being
just the last n bits of the true product, where n is the number of bits
in a long (the delivered product is the true product plus i*2**n for
some integer i).
The native double product (double)x * (double)y is subject to three
rounding errors: on a sizeof(long)==8 box, each cast to double can lose
info, and even on a sizeof(long)==4 box, the multiplication can lose info.
But, unlike the native long product, it's not in *range* trouble: even
if sizeof(long)==32 (256-bit longs), the product easily fits in the
dynamic range of a double. So the leading 50 (or so) bits of the double
product are correct.
We check these two ways against each other, and declare victory if they're
approximately the same. Else, because the native long product is the only
one that can lose catastrophic amounts of information, it's the native long
product that must have overflowed.
*/
static PyObject *
int_mul(PyObject *v, PyObject *w)
{
long a, b;
long longprod; /* a*b in native long arithmetic */
double doubled_longprod; /* (double)longprod */
double doubleprod; /* (double)a * (double)b */
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
longprod = a * b;
doubleprod = (double)a * (double)b;
doubled_longprod = (double)longprod;
/* Fast path for normal case: small multiplicands, and no info
is lost in either method. */
if (doubled_longprod == doubleprod)
return PyInt_FromLong(longprod);
/* Somebody somewhere lost info. Close enough, or way off? Note
that a != 0 and b != 0 (else doubled_longprod == doubleprod == 0).
The difference either is or isn't significant compared to the
true value (of which doubleprod is a good approximation).
*/
{
const double diff = doubled_longprod - doubleprod;
const double absdiff = diff >= 0.0 ? diff : -diff;
const double absprod = doubleprod >= 0.0 ? doubleprod :
-doubleprod;
/* absdiff/absprod <= 1/32 iff
32 * absdiff <= absprod -- 5 good bits is "close enough" */
if (32.0 * absdiff <= absprod)
return PyInt_FromLong(longprod);
else
return PyLong_Type.tp_as_number->nb_multiply(v, w);
}
}
/* Integer overflow checking for unary negation: on a 2's-complement
* box, -x overflows iff x is the most negative long. In this case we
* get -x == x. However, -x is undefined (by C) if x /is/ the most
* negative long (it's a signed overflow case), and some compilers care.
* So we cast x to unsigned long first. However, then other compilers
* warn about applying unary minus to an unsigned operand. Hence the
* weird "0-".
*/
#define UNARY_NEG_WOULD_OVERFLOW(x) \
((x) < 0 && (unsigned long)(x) == 0-(unsigned long)(x))
/* Return type of i_divmod */
enum divmod_result {
DIVMOD_OK, /* Correct result */
DIVMOD_OVERFLOW, /* Overflow, try again using longs */
DIVMOD_ERROR /* Exception raised */
};
static enum divmod_result
i_divmod(register long x, register long y,
long *p_xdivy, long *p_xmody)
{
long xdivy, xmody;
if (y == 0) {
PyErr_SetString(PyExc_ZeroDivisionError,
"integer division or modulo by zero");
return DIVMOD_ERROR;
}
/* (-sys.maxint-1)/-1 is the only overflow case. */
if (y == -1 && UNARY_NEG_WOULD_OVERFLOW(x))
return DIVMOD_OVERFLOW;
xdivy = x / y;
xmody = x - xdivy * y;
/* If the signs of x and y differ, and the remainder is non-0,
* C89 doesn't define whether xdivy is now the floor or the
* ceiling of the infinitely precise quotient. We want the floor,
* and we have it iff the remainder's sign matches y's.
*/
if (xmody && ((y ^ xmody) < 0) /* i.e. and signs differ */) {
xmody += y;
--xdivy;
assert(xmody && ((y ^ xmody) >= 0));
}
*p_xdivy = xdivy;
*p_xmody = xmody;
return DIVMOD_OK;
}
static PyObject *
int_div(PyIntObject *x, PyIntObject *y)
{
long xi, yi;
long d, m;
CONVERT_TO_LONG(x, xi);
CONVERT_TO_LONG(y, yi);
switch (i_divmod(xi, yi, &d, &m)) {
case DIVMOD_OK:
return PyInt_FromLong(d);
case DIVMOD_OVERFLOW:
return PyLong_Type.tp_as_number->nb_divide((PyObject *)x,
(PyObject *)y);
default:
return NULL;
}
}
static PyObject *
int_classic_div(PyIntObject *x, PyIntObject *y)
{
long xi, yi;
long d, m;
CONVERT_TO_LONG(x, xi);
CONVERT_TO_LONG(y, yi);
if (Py_DivisionWarningFlag &&
PyErr_Warn(PyExc_DeprecationWarning, "classic int division") < 0)
return NULL;
switch (i_divmod(xi, yi, &d, &m)) {
case DIVMOD_OK:
return PyInt_FromLong(d);
case DIVMOD_OVERFLOW:
return PyLong_Type.tp_as_number->nb_divide((PyObject *)x,
(PyObject *)y);
default:
return NULL;
}
}
static PyObject *
int_true_divide(PyObject *v, PyObject *w)
{
/* If they aren't both ints, give someone else a chance. In
particular, this lets int/long get handled by longs, which
underflows to 0 gracefully if the long is too big to convert
to float. */
if (PyInt_Check(v) && PyInt_Check(w))
return PyFloat_Type.tp_as_number->nb_true_divide(v, w);
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
static PyObject *
int_mod(PyIntObject *x, PyIntObject *y)
{
long xi, yi;
long d, m;
CONVERT_TO_LONG(x, xi);
CONVERT_TO_LONG(y, yi);
switch (i_divmod(xi, yi, &d, &m)) {
case DIVMOD_OK:
return PyInt_FromLong(m);
case DIVMOD_OVERFLOW:
return PyLong_Type.tp_as_number->nb_remainder((PyObject *)x,
(PyObject *)y);
default:
return NULL;
}
}
static PyObject *
int_divmod(PyIntObject *x, PyIntObject *y)
{
long xi, yi;
long d, m;
CONVERT_TO_LONG(x, xi);
CONVERT_TO_LONG(y, yi);
switch (i_divmod(xi, yi, &d, &m)) {
case DIVMOD_OK:
return Py_BuildValue("(ll)", d, m);
case DIVMOD_OVERFLOW:
return PyLong_Type.tp_as_number->nb_divmod((PyObject *)x,
(PyObject *)y);
default:
return NULL;
}
}
static PyObject *
int_pow(PyIntObject *v, PyIntObject *w, PyIntObject *z)
{
register long iv, iw, iz=0, ix, temp, prev;
CONVERT_TO_LONG(v, iv);
CONVERT_TO_LONG(w, iw);
if (iw < 0) {
if ((PyObject *)z != Py_None) {
PyErr_SetString(PyExc_TypeError, "pow() 2nd argument "
"cannot be negative when 3rd argument specified");
return NULL;
}
/* Return a float. This works because we know that
this calls float_pow() which converts its
arguments to double. */
return PyFloat_Type.tp_as_number->nb_power(
(PyObject *)v, (PyObject *)w, (PyObject *)z);
}
if ((PyObject *)z != Py_None) {
CONVERT_TO_LONG(z, iz);
if (iz == 0) {
PyErr_SetString(PyExc_ValueError,
"pow() 3rd argument cannot be 0");
return NULL;
}
}
/*
* XXX: The original exponentiation code stopped looping
* when temp hit zero; this code will continue onwards
* unnecessarily, but at least it won't cause any errors.
* Hopefully the speed improvement from the fast exponentiation
* will compensate for the slight inefficiency.
* XXX: Better handling of overflows is desperately needed.
*/
temp = iv;
ix = 1;
while (iw > 0) {
prev = ix; /* Save value for overflow check */
if (iw & 1) {
ix = ix*temp;
if (temp == 0)
break; /* Avoid ix / 0 */
if (ix / temp != prev) {
return PyLong_Type.tp_as_number->nb_power(
(PyObject *)v,
(PyObject *)w,
(PyObject *)z);
}
}
iw >>= 1; /* Shift exponent down by 1 bit */
if (iw==0) break;
prev = temp;
temp *= temp; /* Square the value of temp */
if (prev != 0 && temp / prev != prev) {
return PyLong_Type.tp_as_number->nb_power(
(PyObject *)v, (PyObject *)w, (PyObject *)z);
}
if (iz) {
/* If we did a multiplication, perform a modulo */
ix = ix % iz;
temp = temp % iz;
}
}
if (iz) {
long div, mod;
switch (i_divmod(ix, iz, &div, &mod)) {
case DIVMOD_OK:
ix = mod;
break;
case DIVMOD_OVERFLOW:
return PyLong_Type.tp_as_number->nb_power(
(PyObject *)v, (PyObject *)w, (PyObject *)z);
default:
return NULL;
}
}
return PyInt_FromLong(ix);
}
static PyObject *
int_neg(PyIntObject *v)
{
register long a;
a = v->ob_ival;
/* check for overflow */
if (UNARY_NEG_WOULD_OVERFLOW(a)) {
PyObject *o = PyLong_FromLong(a);
if (o != NULL) {
PyObject *result = PyNumber_Negative(o);
Py_DECREF(o);
return result;
}
return NULL;
}
return PyInt_FromLong(-a);
}
static PyObject *
int_pos(PyIntObject *v)
{
if (PyInt_CheckExact(v)) {
Py_INCREF(v);
return (PyObject *)v;
}
else
return PyInt_FromLong(v->ob_ival);
}
static PyObject *
int_abs(PyIntObject *v)
{
if (v->ob_ival >= 0)
return int_pos(v);
else
return int_neg(v);
}
static int
int_nonzero(PyIntObject *v)
{
return v->ob_ival != 0;
}
static PyObject *
int_invert(PyIntObject *v)
{
return PyInt_FromLong(~v->ob_ival);
}
static PyObject *
int_lshift(PyIntObject *v, PyIntObject *w)
{
long a, b, c;
PyObject *vv, *ww, *result;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
if (b < 0) {
PyErr_SetString(PyExc_ValueError, "negative shift count");
return NULL;
}
if (a == 0 || b == 0)
return int_pos(v);
if (b >= LONG_BIT) {
vv = PyLong_FromLong(PyInt_AS_LONG(v));
if (vv == NULL)
return NULL;
ww = PyLong_FromLong(PyInt_AS_LONG(w));
if (ww == NULL) {
Py_DECREF(vv);
return NULL;
}
result = PyNumber_Lshift(vv, ww);
Py_DECREF(vv);
Py_DECREF(ww);
return result;
}
c = a << b;
if (a != Py_ARITHMETIC_RIGHT_SHIFT(long, c, b)) {
vv = PyLong_FromLong(PyInt_AS_LONG(v));
if (vv == NULL)
return NULL;
ww = PyLong_FromLong(PyInt_AS_LONG(w));
if (ww == NULL) {
Py_DECREF(vv);
return NULL;
}
result = PyNumber_Lshift(vv, ww);
Py_DECREF(vv);
Py_DECREF(ww);
return result;
}
return PyInt_FromLong(c);
}
static PyObject *
int_rshift(PyIntObject *v, PyIntObject *w)
{
register long a, b;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
if (b < 0) {
PyErr_SetString(PyExc_ValueError, "negative shift count");
return NULL;
}
if (a == 0 || b == 0)
return int_pos(v);
if (b >= LONG_BIT) {
if (a < 0)
a = -1;
else
a = 0;
}
else {
a = Py_ARITHMETIC_RIGHT_SHIFT(long, a, b);
}
return PyInt_FromLong(a);
}
static PyObject *
int_and(PyIntObject *v, PyIntObject *w)
{
register long a, b;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
return PyInt_FromLong(a & b);
}
static PyObject *
int_xor(PyIntObject *v, PyIntObject *w)
{
register long a, b;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
return PyInt_FromLong(a ^ b);
}
static PyObject *
int_or(PyIntObject *v, PyIntObject *w)
{
register long a, b;
CONVERT_TO_LONG(v, a);
CONVERT_TO_LONG(w, b);
return PyInt_FromLong(a | b);
}
static int
int_coerce(PyObject **pv, PyObject **pw)
{
if (PyInt_Check(*pw)) {
Py_INCREF(*pv);
Py_INCREF(*pw);
return 0;
}
return 1; /* Can't do it */
}
static PyObject *
int_int(PyIntObject *v)
{
if (PyInt_CheckExact(v))
Py_INCREF(v);
else
v = (PyIntObject *)PyInt_FromLong(v->ob_ival);
return (PyObject *)v;
}
static PyObject *
int_long(PyIntObject *v)
{
return PyLong_FromLong((v -> ob_ival));
}
static PyObject *
int_float(PyIntObject *v)
{
return PyFloat_FromDouble((double)(v -> ob_ival));
}
static PyObject *
int_oct(PyIntObject *v)
{
char buf[100];
long x = v -> ob_ival;
if (x < 0)
PyOS_snprintf(buf, sizeof(buf), "-0%lo", -x);
else if (x == 0)
strcpy(buf, "0");
else
PyOS_snprintf(buf, sizeof(buf), "0%lo", x);
return PyString_FromString(buf);
}
static PyObject *
int_hex(PyIntObject *v)
{
char buf[100];
long x = v -> ob_ival;
if (x < 0)
PyOS_snprintf(buf, sizeof(buf), "-0x%lx", -x);
else
PyOS_snprintf(buf, sizeof(buf), "0x%lx", x);
return PyString_FromString(buf);
}
static PyObject *
int_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static PyObject *
int_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *x = NULL;
int base = -909;
static char *kwlist[] = {"x", "base", 0};
if (type != &PyInt_Type)
return int_subtype_new(type, args, kwds); /* Wimp out */
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oi:int", kwlist,
&x, &base))
return NULL;
if (x == NULL)
return PyInt_FromLong(0L);
if (base == -909)
return PyNumber_Int(x);
if (PyString_Check(x)) {
/* Since PyInt_FromString doesn't have a length parameter,
* check here for possible NULs in the string. */
char *string = PyString_AS_STRING(x);
if (strlen(string) != PyString_Size(x)) {
/* create a repr() of the input string,
* just like PyInt_FromString does */
PyObject *srepr;
srepr = PyObject_Repr(x);
if (srepr == NULL)
return NULL;
PyErr_Format(PyExc_ValueError,
"invalid literal for int() with base %d: %s",
base, PyString_AS_STRING(srepr));
Py_DECREF(srepr);
return NULL;
}
return PyInt_FromString(string, NULL, base);
}
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(x))
return PyInt_FromUnicode(PyUnicode_AS_UNICODE(x),
PyUnicode_GET_SIZE(x),
base);
#endif
PyErr_SetString(PyExc_TypeError,
"int() can't convert non-string with explicit base");
return NULL;
}
/* Wimpy, slow approach to tp_new calls for subtypes of int:
first create a regular int from whatever arguments we got,
then allocate a subtype instance and initialize its ob_ival
from the regular int. The regular int is then thrown away.
*/
static PyObject *
int_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *tmp, *newobj;
long ival;
assert(PyType_IsSubtype(type, &PyInt_Type));
tmp = int_new(&PyInt_Type, args, kwds);
if (tmp == NULL)
return NULL;
if (!PyInt_Check(tmp)) {
ival = PyLong_AsLong(tmp);
if (ival == -1 && PyErr_Occurred()) {
Py_DECREF(tmp);
return NULL;
}
} else {
ival = ((PyIntObject *)tmp)->ob_ival;
}
newobj = type->tp_alloc(type, 0);
if (newobj == NULL) {
Py_DECREF(tmp);
return NULL;
}
((PyIntObject *)newobj)->ob_ival = ival;
Py_DECREF(tmp);
return newobj;
}
static PyObject *
int_getnewargs(PyIntObject *v)
{
return Py_BuildValue("(l)", v->ob_ival);
}
static PyMethodDef int_methods[] = {
{"__getnewargs__", (PyCFunction)int_getnewargs, METH_NOARGS},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(int_doc,
"int(x[, base]) -> integer\n\
\n\
Convert a string or number to an integer, if possible. A floating point\n\
argument will be truncated towards zero (this does not include a string\n\
representation of a floating point number!) When converting a string, use\n\
the optional base. It is an error to supply a base when converting a\n\
non-string. If the argument is outside the integer range a long object\n\
will be returned instead.");
static PyNumberMethods int_as_number = {
(binaryfunc)int_add, /*nb_add*/
(binaryfunc)int_sub, /*nb_subtract*/
(binaryfunc)int_mul, /*nb_multiply*/
(binaryfunc)int_classic_div, /*nb_divide*/
(binaryfunc)int_mod, /*nb_remainder*/
(binaryfunc)int_divmod, /*nb_divmod*/
(ternaryfunc)int_pow, /*nb_power*/
(unaryfunc)int_neg, /*nb_negative*/
(unaryfunc)int_pos, /*nb_positive*/
(unaryfunc)int_abs, /*nb_absolute*/
(inquiry)int_nonzero, /*nb_nonzero*/
(unaryfunc)int_invert, /*nb_invert*/
(binaryfunc)int_lshift, /*nb_lshift*/
(binaryfunc)int_rshift, /*nb_rshift*/
(binaryfunc)int_and, /*nb_and*/
(binaryfunc)int_xor, /*nb_xor*/
(binaryfunc)int_or, /*nb_or*/
int_coerce, /*nb_coerce*/
(unaryfunc)int_int, /*nb_int*/
(unaryfunc)int_long, /*nb_long*/
(unaryfunc)int_float, /*nb_float*/
(unaryfunc)int_oct, /*nb_oct*/
(unaryfunc)int_hex, /*nb_hex*/
0, /*nb_inplace_add*/
0, /*nb_inplace_subtract*/
0, /*nb_inplace_multiply*/
0, /*nb_inplace_divide*/
0, /*nb_inplace_remainder*/
0, /*nb_inplace_power*/
0, /*nb_inplace_lshift*/
0, /*nb_inplace_rshift*/
0, /*nb_inplace_and*/
0, /*nb_inplace_xor*/
0, /*nb_inplace_or*/
(binaryfunc)int_div, /* nb_floor_divide */
int_true_divide, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
(unaryfunc)int_int, /* nb_index */
};
PyTypeObject PyInt_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"int",
sizeof(PyIntObject),
0,
(destructor)int_dealloc, /* tp_dealloc */
(printfunc)int_print, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
(cmpfunc)int_compare, /* tp_compare */
(reprfunc)int_repr, /* tp_repr */
&int_as_number, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)int_hash, /* tp_hash */
0, /* tp_call */
(reprfunc)int_repr, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
Py_TPFLAGS_BASETYPE, /* tp_flags */
int_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
int_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
int_new, /* tp_new */
(freefunc)int_free, /* tp_free */
};
int
_PyInt_Init(void)
{
PyIntObject *v;
int ival;
#if NSMALLNEGINTS + NSMALLPOSINTS > 0
for (ival = -NSMALLNEGINTS; ival < NSMALLPOSINTS; ival++) {
if (!free_list && (free_list = fill_free_list()) == NULL)
return 0;
/* PyObject_New is inlined */
v = free_list;
free_list = (PyIntObject *)v->ob_type;
PyObject_INIT(v, &PyInt_Type);
v->ob_ival = ival;
small_ints[ival + NSMALLNEGINTS] = v;
}
#endif
return 1;
}
void
PyInt_Fini(void)
{
PyIntObject *p;
PyIntBlock *list, *next;
int i;
unsigned int ctr;
int bc, bf; /* block count, number of freed blocks */
int irem, isum; /* remaining unfreed ints per block, total */
#if NSMALLNEGINTS + NSMALLPOSINTS > 0
PyIntObject **q;
i = NSMALLNEGINTS + NSMALLPOSINTS;
q = small_ints;
while (--i >= 0) {
Py_XDECREF(*q);
*q++ = NULL;
}
#endif
bc = 0;
bf = 0;
isum = 0;
list = block_list;
block_list = NULL;
free_list = NULL;
while (list != NULL) {
bc++;
irem = 0;
for (ctr = 0, p = &list->objects[0];
ctr < N_INTOBJECTS;
ctr++, p++) {
if (PyInt_CheckExact(p) && p->ob_refcnt != 0)
irem++;
}
next = list->next;
if (irem) {
list->next = block_list;
block_list = list;
for (ctr = 0, p = &list->objects[0];
ctr < N_INTOBJECTS;
ctr++, p++) {
if (!PyInt_CheckExact(p) ||
p->ob_refcnt == 0) {
p->ob_type = (struct _typeobject *)
free_list;
free_list = p;
}
#if NSMALLNEGINTS + NSMALLPOSINTS > 0
else if (-NSMALLNEGINTS <= p->ob_ival &&
p->ob_ival < NSMALLPOSINTS &&
small_ints[p->ob_ival +
NSMALLNEGINTS] == NULL) {
Py_INCREF(p);
small_ints[p->ob_ival +
NSMALLNEGINTS] = p;
}
#endif
}
}
else {
PyMem_FREE(list);
bf++;
}
isum += irem;
list = next;
}
if (!Py_VerboseFlag)
return;
fprintf(stderr, "# cleanup ints");
if (!isum) {
fprintf(stderr, "\n");
}
else {
fprintf(stderr,
": %d unfreed int%s in %d out of %d block%s\n",
isum, isum == 1 ? "" : "s",
bc - bf, bc, bc == 1 ? "" : "s");
}
if (Py_VerboseFlag > 1) {
list = block_list;
while (list != NULL) {
for (ctr = 0, p = &list->objects[0];
ctr < N_INTOBJECTS;
ctr++, p++) {
if (PyInt_CheckExact(p) && p->ob_refcnt != 0)
/* XXX(twouters) cast refcount to
long until %zd is universally
available
*/
fprintf(stderr,
"# <int at %p, refcnt=%ld, val=%ld>\n",
p, (long)p->ob_refcnt,
p->ob_ival);
}
list = list->next;
}
}
}