mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
459 lines
8.3 KiB
C
459 lines
8.3 KiB
C
/***********************************************************
|
|
Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
|
|
Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior permission.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
|
|
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
|
|
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* Integer object implementation */
|
|
|
|
#include "allobjects.h"
|
|
|
|
/* Standard Booleans */
|
|
|
|
intobject FalseObject = {
|
|
OB_HEAD_INIT(&Inttype)
|
|
0
|
|
};
|
|
|
|
intobject TrueObject = {
|
|
OB_HEAD_INIT(&Inttype)
|
|
1
|
|
};
|
|
|
|
static object *
|
|
err_ovf(msg)
|
|
char *msg;
|
|
{
|
|
err_setstr(OverflowError, msg);
|
|
return NULL;
|
|
}
|
|
|
|
/* 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().
|
|
*/
|
|
|
|
#define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */
|
|
#define N_INTOBJECTS (BLOCK_SIZE / sizeof(intobject))
|
|
|
|
static intobject *
|
|
fill_free_list()
|
|
{
|
|
intobject *p, *q;
|
|
p = NEW(intobject, N_INTOBJECTS);
|
|
if (p == NULL)
|
|
return (intobject *)err_nomem();
|
|
q = p + N_INTOBJECTS;
|
|
while (--q > p)
|
|
*(intobject **)q = q-1;
|
|
*(intobject **)q = NULL;
|
|
return p + N_INTOBJECTS - 1;
|
|
}
|
|
|
|
static intobject *free_list = NULL;
|
|
|
|
object *
|
|
newintobject(ival)
|
|
long ival;
|
|
{
|
|
register intobject *v;
|
|
if (free_list == NULL) {
|
|
if ((free_list = fill_free_list()) == NULL)
|
|
return NULL;
|
|
}
|
|
v = free_list;
|
|
free_list = *(intobject **)free_list;
|
|
NEWREF(v);
|
|
v->ob_type = &Inttype;
|
|
v->ob_ival = ival;
|
|
return (object *) v;
|
|
}
|
|
|
|
static void
|
|
int_dealloc(v)
|
|
intobject *v;
|
|
{
|
|
*(intobject **)v = free_list;
|
|
free_list = v;
|
|
}
|
|
|
|
long
|
|
getintvalue(op)
|
|
register object *op;
|
|
{
|
|
if (!is_intobject(op)) {
|
|
err_badcall();
|
|
return -1;
|
|
}
|
|
else
|
|
return ((intobject *)op) -> ob_ival;
|
|
}
|
|
|
|
/* Methods */
|
|
|
|
static int
|
|
int_print(v, fp, flags)
|
|
intobject *v;
|
|
FILE *fp;
|
|
int flags;
|
|
{
|
|
fprintf(fp, "%ld", v->ob_ival);
|
|
return 0;
|
|
}
|
|
|
|
static object *
|
|
int_repr(v)
|
|
intobject *v;
|
|
{
|
|
char buf[20];
|
|
sprintf(buf, "%ld", v->ob_ival);
|
|
return newstringobject(buf);
|
|
}
|
|
|
|
static int
|
|
int_compare(v, w)
|
|
intobject *v, *w;
|
|
{
|
|
register long i = v->ob_ival;
|
|
register long j = w->ob_ival;
|
|
return (i < j) ? -1 : (i > j) ? 1 : 0;
|
|
}
|
|
|
|
static object *
|
|
int_add(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b, x;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
x = a + b;
|
|
if ((x^a) < 0 && (x^b) < 0)
|
|
return err_ovf("integer addition");
|
|
return newintobject(x);
|
|
}
|
|
|
|
static object *
|
|
int_sub(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b, x;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
x = a - b;
|
|
if ((x^a) < 0 && (x^~b) < 0)
|
|
return err_ovf("integer subtraction");
|
|
return newintobject(x);
|
|
}
|
|
|
|
static object *
|
|
int_mul(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
double x;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
x = (double)a * (double)b;
|
|
if (x > 0x7fffffff || x < (double) (long) 0x80000000)
|
|
return err_ovf("integer multiplication");
|
|
return newintobject(a * b);
|
|
}
|
|
|
|
static int
|
|
i_divmod(x, y, p_xdivy, p_xmody)
|
|
register intobject *x, *y;
|
|
long *p_xdivy, *p_xmody;
|
|
{
|
|
long xi = x->ob_ival;
|
|
long yi = y->ob_ival;
|
|
long xdivy, xmody;
|
|
|
|
if (yi == 0) {
|
|
err_setstr(ZeroDivisionError, "integer division or modulo");
|
|
return -1;
|
|
}
|
|
if (yi < 0) {
|
|
if (xi < 0)
|
|
xdivy = -xi / -yi;
|
|
else
|
|
xdivy = - (xi / -yi);
|
|
}
|
|
else {
|
|
if (xi < 0)
|
|
xdivy = - (-xi / yi);
|
|
else
|
|
xdivy = xi / yi;
|
|
}
|
|
xmody = xi - xdivy*yi;
|
|
if (xmody < 0 && yi > 0 || xmody > 0 && yi < 0) {
|
|
xmody += yi;
|
|
xdivy -= 1;
|
|
}
|
|
*p_xdivy = xdivy;
|
|
*p_xmody = xmody;
|
|
return 0;
|
|
}
|
|
|
|
static object *
|
|
int_div(x, y)
|
|
intobject *x;
|
|
intobject *y;
|
|
{
|
|
long d, m;
|
|
if (i_divmod(x, y, &d, &m) < 0)
|
|
return NULL;
|
|
return newintobject(d);
|
|
}
|
|
|
|
static object *
|
|
int_mod(x, y)
|
|
intobject *x;
|
|
intobject *y;
|
|
{
|
|
long d, m;
|
|
if (i_divmod(x, y, &d, &m) < 0)
|
|
return NULL;
|
|
newintobject(m);
|
|
}
|
|
|
|
static object *
|
|
int_divmod(x, y)
|
|
intobject *x;
|
|
intobject *y;
|
|
{
|
|
object *v, *v0, *v1;
|
|
long d, m;
|
|
if (i_divmod(x, y, &d, &m) < 0)
|
|
return NULL;
|
|
v = newtupleobject(2);
|
|
v0 = newintobject(d);
|
|
v1 = newintobject(m);
|
|
if (v == NULL || v0 == NULL || v1 == NULL ||
|
|
settupleitem(v, 0, v0) != 0 ||
|
|
settupleitem(v, 1, v1) != 0) {
|
|
XDECREF(v);
|
|
XDECREF(v0);
|
|
XDECREF(v1);
|
|
v = NULL;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
static object *
|
|
int_pow(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long iv, iw, ix;
|
|
iv = v->ob_ival;
|
|
iw = w->ob_ival;
|
|
if (iw < 0) {
|
|
err_setstr(ValueError, "integer to the negative power");
|
|
return NULL;
|
|
}
|
|
ix = 1;
|
|
while (--iw >= 0) {
|
|
long prev = ix;
|
|
ix = ix * iv;
|
|
if (iv == 0)
|
|
break; /* 0 to some power -- avoid ix / 0 */
|
|
if (ix / iv != prev)
|
|
return err_ovf("integer pow()");
|
|
}
|
|
return newintobject(ix);
|
|
}
|
|
|
|
static object *
|
|
int_neg(v)
|
|
intobject *v;
|
|
{
|
|
register long a, x;
|
|
a = v->ob_ival;
|
|
x = -a;
|
|
if (a < 0 && x < 0)
|
|
return err_ovf("integer negation");
|
|
return newintobject(x);
|
|
}
|
|
|
|
static object *
|
|
int_pos(v)
|
|
intobject *v;
|
|
{
|
|
INCREF(v);
|
|
return (object *)v;
|
|
}
|
|
|
|
static object *
|
|
int_abs(v)
|
|
intobject *v;
|
|
{
|
|
if (v->ob_ival >= 0)
|
|
return int_pos(v);
|
|
else
|
|
return int_neg(v);
|
|
}
|
|
|
|
static int
|
|
int_nonzero(v)
|
|
intobject *v;
|
|
{
|
|
return v->ob_ival != 0;
|
|
}
|
|
|
|
static object *
|
|
int_invert(v)
|
|
intobject *v;
|
|
{
|
|
return newintobject(~v->ob_ival);
|
|
}
|
|
|
|
static object *
|
|
int_lshift(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
if (b < 0) {
|
|
err_setstr(ValueError, "negative shift count");
|
|
return NULL;
|
|
}
|
|
if (a == 0 || b == 0) {
|
|
INCREF(v);
|
|
return (object *) v;
|
|
}
|
|
if (b >= 32) {
|
|
return newintobject(0L);
|
|
}
|
|
a = (unsigned long)a << b;
|
|
return newintobject(a);
|
|
}
|
|
|
|
static object *
|
|
int_rshift(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
if (b < 0) {
|
|
err_setstr(ValueError, "negative shift count");
|
|
return NULL;
|
|
}
|
|
if (a == 0 || b == 0) {
|
|
INCREF(v);
|
|
return (object *) v;
|
|
}
|
|
if (b >= 32) {
|
|
if (a < 0)
|
|
a = -1;
|
|
else
|
|
a = 0;
|
|
}
|
|
else {
|
|
if (a < 0)
|
|
a = ~( ~(unsigned long)a >> b );
|
|
else
|
|
a = (unsigned long)a >> b;
|
|
}
|
|
return newintobject(a);
|
|
}
|
|
|
|
static object *
|
|
int_and(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
return newintobject(a & b);
|
|
}
|
|
|
|
static object *
|
|
int_xor(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
return newintobject(a ^ b);
|
|
}
|
|
|
|
static object *
|
|
int_or(v, w)
|
|
intobject *v;
|
|
intobject *w;
|
|
{
|
|
register long a, b;
|
|
a = v->ob_ival;
|
|
b = w->ob_ival;
|
|
return newintobject(a | b);
|
|
}
|
|
|
|
static number_methods int_as_number = {
|
|
int_add, /*nb_add*/
|
|
int_sub, /*nb_subtract*/
|
|
int_mul, /*nb_multiply*/
|
|
int_div, /*nb_divide*/
|
|
int_mod, /*nb_remainder*/
|
|
int_divmod, /*nb_divmod*/
|
|
int_pow, /*nb_power*/
|
|
int_neg, /*nb_negative*/
|
|
int_pos, /*nb_positive*/
|
|
int_abs, /*nb_absolute*/
|
|
int_nonzero, /*nb_nonzero*/
|
|
int_invert, /*nb_invert*/
|
|
int_lshift, /*nb_lshift*/
|
|
int_rshift, /*nb_rshift*/
|
|
int_and, /*nb_and*/
|
|
int_xor, /*nb_xor*/
|
|
int_or, /*nb_or*/
|
|
};
|
|
|
|
typeobject Inttype = {
|
|
OB_HEAD_INIT(&Typetype)
|
|
0,
|
|
"int",
|
|
sizeof(intobject),
|
|
0,
|
|
int_dealloc, /*tp_dealloc*/
|
|
int_print, /*tp_print*/
|
|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
int_compare, /*tp_compare*/
|
|
int_repr, /*tp_repr*/
|
|
&int_as_number, /*tp_as_number*/
|
|
0, /*tp_as_sequence*/
|
|
0, /*tp_as_mapping*/
|
|
};
|