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Copy patharraymodule.c
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3484 lines (3065 loc) · 98.6 KB
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/* Array object implementation */
/* An array is a uniform list -- all items have the same type.
The item type is restricted to simple C types like int or float */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_bytesobject.h" // _PyBytes_RepeatBuffer
#include "pycore_call.h" // _PyObject_CallMethod()
#include "pycore_ceval.h" // _PyEval_GetBuiltin()
#include "pycore_floatobject.h" // _PY_FLOAT_BIG_ENDIAN
#include "pycore_modsupport.h" // _PyArg_NoKeywords()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "pycore_tuple.h" // _PyTuple_FromPairSteal
#include "pycore_weakref.h" // FT_CLEAR_WEAKREFS()
#include <stddef.h> // offsetof()
#include <stdbool.h>
/*[clinic input]
module array
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=7d1b8d7f5958fd83]*/
struct arrayobject; /* Forward */
static struct PyModuleDef arraymodule;
/* All possible arraydescr values are defined in the vector "descriptors"
* below. That's defined later because the appropriate get and set
* functions aren't visible yet.
*/
struct arraydescr {
char typecode[3]; // big enough to store "Zd\0"
int itemsize;
PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
int (*compareitems)(const void *, const void *, Py_ssize_t);
int is_integer_type;
int is_signed;
};
typedef struct arrayobject {
PyObject_VAR_HEAD
char *ob_item;
Py_ssize_t allocated;
const struct arraydescr *ob_descr;
PyObject *weakreflist; /* List of weak references */
Py_ssize_t ob_exports; /* Number of exported buffers */
} arrayobject;
typedef struct {
PyObject_HEAD
Py_ssize_t index;
arrayobject *ao;
PyObject* (*getitem)(struct arrayobject *, Py_ssize_t);
} arrayiterobject;
typedef struct {
PyTypeObject *ArrayType;
PyTypeObject *ArrayIterType;
PyObject *array_reconstructor;
PyObject *str_read;
PyObject *str_write;
PyObject *str___dict__;
PyObject *str_iter;
PyObject *typecodes;
} array_state;
static array_state *
get_array_state(PyObject *module)
{
return (array_state *)_PyModule_GetState(module);
}
#define find_array_state_by_type(tp) \
(get_array_state(PyType_GetModuleByDef(tp, &arraymodule)))
#define get_array_state_by_class(cls) \
(get_array_state(PyType_GetModule(cls)))
#define arrayobject_CAST(op) ((arrayobject *)(op))
#define arrayiterobject_CAST(op) ((arrayiterobject *)(op))
enum machine_format_code {
UNKNOWN_FORMAT = -1,
/* UNKNOWN_FORMAT is used to indicate that the machine format for an
* array type code cannot be interpreted. When this occurs, a list of
* Python objects is used to represent the content of the array
* instead of using the memory content of the array directly. In that
* case, the array_reconstructor mechanism is bypassed completely, and
* the standard array constructor is used instead.
*/
UNSIGNED_INT8 = 0,
SIGNED_INT8 = 1,
UNSIGNED_INT16_LE = 2,
UNSIGNED_INT16_BE = 3,
SIGNED_INT16_LE = 4,
SIGNED_INT16_BE = 5,
UNSIGNED_INT32_LE = 6,
UNSIGNED_INT32_BE = 7,
SIGNED_INT32_LE = 8,
SIGNED_INT32_BE = 9,
UNSIGNED_INT64_LE = 10,
UNSIGNED_INT64_BE = 11,
SIGNED_INT64_LE = 12,
SIGNED_INT64_BE = 13,
IEEE_754_FLOAT_LE = 14,
IEEE_754_FLOAT_BE = 15,
IEEE_754_DOUBLE_LE = 16,
IEEE_754_DOUBLE_BE = 17,
UTF16_LE = 18,
UTF16_BE = 19,
UTF32_LE = 20,
UTF32_BE = 21,
IEEE_754_FLOAT_COMPLEX_LE = 22,
IEEE_754_FLOAT_COMPLEX_BE = 23,
IEEE_754_DOUBLE_COMPLEX_LE = 24,
IEEE_754_DOUBLE_COMPLEX_BE = 25,
IEEE_754_FLOAT16_LE = 26,
IEEE_754_FLOAT16_BE = 27
};
#define MACHINE_FORMAT_CODE_MIN 0
#define MACHINE_FORMAT_CODE_MAX 27
/*
* Must come after arrayobject, arrayiterobject,
* and enum machine_code_type definitions.
*/
#include "clinic/arraymodule.c.h"
#define array_Check(op, state) PyObject_TypeCheck(op, state->ArrayType)
static int
array_resize(arrayobject *self, Py_ssize_t newsize)
{
char *items;
size_t _new_size;
if (self->ob_exports > 0 && newsize != Py_SIZE(self)) {
PyErr_SetString(PyExc_BufferError,
"cannot resize an array that is exporting buffers");
return -1;
}
/* Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize. If the newsize is 16 smaller than the
current size, then proceed with the realloc() to shrink the array.
*/
if (self->allocated >= newsize &&
Py_SIZE(self) < newsize + 16 &&
self->ob_item != NULL) {
Py_SET_SIZE(self, newsize);
return 0;
}
if (newsize == 0) {
PyMem_Free(self->ob_item);
self->ob_item = NULL;
Py_SET_SIZE(self, 0);
self->allocated = 0;
return 0;
}
/* This over-allocates proportional to the array size, making room
* for additional growth. The over-allocation is mild, but is
* enough to give linear-time amortized behavior over a long
* sequence of appends() in the presence of a poorly-performing
* system realloc().
* The growth pattern is: 0, 4, 8, 16, 25, 34, 46, 56, 67, 79, ...
* Note, the pattern starts out the same as for lists but then
* grows at a smaller rate so that larger arrays only overallocate
* by about 1/16th -- this is done because arrays are presumed to be more
* memory critical.
*/
_new_size = (newsize >> 4) + (Py_SIZE(self) < 8 ? 3 : 7) + newsize;
items = self->ob_item;
/* XXX The following multiplication and division does not optimize away
like it does for lists since the size is not known at compile time */
if (_new_size <= ((~(size_t)0) / self->ob_descr->itemsize))
PyMem_RESIZE(items, char, (_new_size * self->ob_descr->itemsize));
else
items = NULL;
if (items == NULL) {
PyErr_NoMemory();
return -1;
}
self->ob_item = items;
Py_SET_SIZE(self, newsize);
self->allocated = _new_size;
return 0;
}
/****************************************************************************
Get and Set functions for each type.
A Get function takes an arrayobject* and an integer index, returning the
array value at that index wrapped in an appropriate PyObject*.
A Set function takes an arrayobject, integer index, and PyObject*; sets
the array value at that index to the raw C data extracted from the PyObject*,
and returns 0 if successful, else nonzero on failure (PyObject* not of an
appropriate type or value).
Note that the basic Get and Set functions do NOT check that the index is
in bounds; that's the responsibility of the caller.
****************************************************************************/
/* Macro to check array buffer validity and bounds after calling
user-defined methods (like __index__ or __float__) that might modify
the array during the call.
*/
#define CHECK_ARRAY_BOUNDS(OP, IDX) \
do { \
if ((IDX) >= 0 && ((OP)->ob_item == NULL || \
(IDX) >= Py_SIZE((OP)))) { \
PyErr_SetString(PyExc_IndexError, \
"array assignment index out of range"); \
return -1; \
} \
} while (0)
#define CHECK_ARRAY_BOUNDS_WITH_CLEANUP(OP, IDX, VAL, CLEANUP) \
do { \
if ((IDX) >= 0 && ((OP)->ob_item == NULL || \
(IDX) >= Py_SIZE((OP)))) { \
PyErr_SetString(PyExc_IndexError, \
"array assignment index out of range"); \
if (CLEANUP) { \
Py_DECREF(VAL); \
} \
return -1; \
} \
} while (0)
static PyObject *
b_getitem(arrayobject *ap, Py_ssize_t i)
{
long x = ((signed char *)ap->ob_item)[i];
return PyLong_FromLong(x);
}
static int
b_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
short x;
/* PyArg_Parse's 'b' formatter is for an unsigned char, therefore
must use the next size up that is signed ('h') and manually do
the overflow checking */
if (!PyArg_Parse(v, "h;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (x < -128) {
PyErr_SetString(PyExc_OverflowError,
"signed char is less than minimum");
return -1;
}
else if (x > 127) {
PyErr_SetString(PyExc_OverflowError,
"signed char is greater than maximum");
return -1;
}
if (i >= 0)
((char *)ap->ob_item)[i] = (char)x;
return 0;
}
static PyObject *
BB_getitem(arrayobject *ap, Py_ssize_t i)
{
long x = ((unsigned char *)ap->ob_item)[i];
return PyLong_FromLong(x);
}
static int
BB_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned char x;
/* 'B' == unsigned char, maps to PyArg_Parse's 'b' formatter */
if (!PyArg_Parse(v, "b;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((unsigned char *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
w_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyUnicode_FromOrdinal(((Py_UCS4 *) ap->ob_item)[i]);
}
static int
w_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
if (!PyUnicode_Check(v)) {
PyErr_Format(PyExc_TypeError,
"array item must be a unicode character, not %T",
v);
return -1;
}
if (PyUnicode_GET_LENGTH(v) != 1) {
PyErr_Format(PyExc_TypeError,
"array item must be a unicode character, "
"not a string of length %zd",
PyUnicode_GET_LENGTH(v));
return -1;
}
if (i >= 0) {
((Py_UCS4 *)ap->ob_item)[i] = PyUnicode_READ_CHAR(v, 0);
}
return 0;
}
static PyObject *
h_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((short *)ap->ob_item)[i]);
}
static int
h_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
short x;
/* 'h' == signed short, maps to PyArg_Parse's 'h' formatter */
if (!PyArg_Parse(v, "h;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((short *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
HH_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((unsigned short *)ap->ob_item)[i]);
}
static int
HH_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
int x;
/* PyArg_Parse's 'h' formatter is for a signed short, therefore
must use the next size up and manually do the overflow checking */
if (!PyArg_Parse(v, "i;array item must be integer", &x))
return -1;
else if (x < 0) {
PyErr_SetString(PyExc_OverflowError,
"unsigned short is less than minimum");
return -1;
}
else if (x > USHRT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned short is greater than maximum");
return -1;
}
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((short *)ap->ob_item)[i] = (short)x;
return 0;
}
static PyObject *
i_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong((long) ((int *)ap->ob_item)[i]);
}
static int
i_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
int x;
/* 'i' == signed int, maps to PyArg_Parse's 'i' formatter */
if (!PyArg_Parse(v, "i;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((int *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
II_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLong(
(unsigned long) ((unsigned int *)ap->ob_item)[i]);
}
static int
II_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned long x;
int do_decref = 0; /* if nb_int was called */
if (!PyLong_Check(v)) {
Py_INCREF(v);
PyObject *res = _PyNumber_Index(v);
Py_DECREF(v);
if (NULL == res) {
return -1;
}
v = res;
do_decref = 1;
}
x = PyLong_AsUnsignedLong(v);
if (x == (unsigned long)-1 && PyErr_Occurred()) {
if (do_decref) {
Py_DECREF(v);
}
return -1;
}
if (x > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"unsigned int is greater than maximum");
if (do_decref) {
Py_DECREF(v);
}
return -1;
}
CHECK_ARRAY_BOUNDS_WITH_CLEANUP(ap, i, v, do_decref);
if (i >= 0)
((unsigned int *)ap->ob_item)[i] = (unsigned int)x;
if (do_decref) {
Py_DECREF(v);
}
return 0;
}
static PyObject *
l_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLong(((long *)ap->ob_item)[i]);
}
static int
l_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
long x;
if (!PyArg_Parse(v, "l;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((long *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
LL_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);
}
static int
LL_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned long x;
int do_decref = 0; /* if nb_int was called */
if (!PyLong_Check(v)) {
Py_INCREF(v);
PyObject *res = _PyNumber_Index(v);
Py_DECREF(v);
if (NULL == res) {
return -1;
}
v = res;
do_decref = 1;
}
x = PyLong_AsUnsignedLong(v);
if (x == (unsigned long)-1 && PyErr_Occurred()) {
if (do_decref) {
Py_DECREF(v);
}
return -1;
}
CHECK_ARRAY_BOUNDS_WITH_CLEANUP(ap, i, v, do_decref);
if (i >= 0)
((unsigned long *)ap->ob_item)[i] = x;
if (do_decref) {
Py_DECREF(v);
}
return 0;
}
static PyObject *
q_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromLongLong(((long long *)ap->ob_item)[i]);
}
static int
q_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
long long x;
if (!PyArg_Parse(v, "L;array item must be integer", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((long long *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
QQ_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyLong_FromUnsignedLongLong(
((unsigned long long *)ap->ob_item)[i]);
}
static int
QQ_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
unsigned long long x;
int do_decref = 0; /* if nb_int was called */
if (!PyLong_Check(v)) {
Py_INCREF(v);
PyObject *res = _PyNumber_Index(v);
Py_DECREF(v);
if (NULL == res) {
return -1;
}
v = res;
do_decref = 1;
}
x = PyLong_AsUnsignedLongLong(v);
if (x == (unsigned long long)-1 && PyErr_Occurred()) {
if (do_decref) {
Py_DECREF(v);
}
return -1;
}
CHECK_ARRAY_BOUNDS_WITH_CLEANUP(ap, i, v, do_decref);
if (i >= 0)
((unsigned long long *)ap->ob_item)[i] = x;
if (do_decref) {
Py_DECREF(v);
}
return 0;
}
static PyObject *
e_getitem(arrayobject *ap, Py_ssize_t i)
{
double x = PyFloat_Unpack2(ap->ob_item + sizeof(short)*i,
PY_LITTLE_ENDIAN);
return PyFloat_FromDouble(x);
}
static int
e_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
float x;
if (!PyArg_Parse(v, "f;array item must be float", &x)) {
return -1;
}
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0) {
return PyFloat_Pack2(x, ap->ob_item + sizeof(short)*i,
PY_LITTLE_ENDIAN);
}
return 0;
}
static PyObject *
f_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);
}
static int
f_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
float x;
if (!PyArg_Parse(v, "f;array item must be float", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((float *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
d_getitem(arrayobject *ap, Py_ssize_t i)
{
return PyFloat_FromDouble(((double *)ap->ob_item)[i]);
}
static int
d_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
double x;
if (!PyArg_Parse(v, "d;array item must be float", &x))
return -1;
CHECK_ARRAY_BOUNDS(ap, i);
if (i >= 0)
((double *)ap->ob_item)[i] = x;
return 0;
}
static PyObject *
cf_getitem(arrayobject *ap, Py_ssize_t i)
{
float f[2];
memcpy(&f, ap->ob_item + i*sizeof(f), sizeof(f));
return PyComplex_FromDoubles(f[0], f[1]);
}
static int
cf_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
Py_complex x;
float f[2];
if (!PyArg_Parse(v, "D;array item must be complex", &x)) {
return -1;
}
CHECK_ARRAY_BOUNDS(ap, i);
f[0] = (float)x.real;
f[1] = (float)x.imag;
if (i >= 0) {
memcpy(ap->ob_item + i*sizeof(f), &f, sizeof(f));
}
return 0;
}
static PyObject *
cd_getitem(arrayobject *ap, Py_ssize_t i)
{
double f[2];
memcpy(&f, ap->ob_item + i*sizeof(f), sizeof(f));
return PyComplex_FromDoubles(f[0], f[1]);
}
static int
cd_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
{
Py_complex x;
double f[2];
if (!PyArg_Parse(v, "D;array item must be complex", &x)) {
return -1;
}
CHECK_ARRAY_BOUNDS(ap, i);
f[0] = x.real;
f[1] = x.imag;
if (i >= 0) {
memcpy(ap->ob_item + i*sizeof(f), &f, sizeof(f));
}
return 0;
}
#define DEFINE_COMPAREITEMS(code, type) \
static int \
code##_compareitems(const void *lhs, const void *rhs, Py_ssize_t length) \
{ \
const type *a = lhs, *b = rhs; \
for (Py_ssize_t i = 0; i < length; ++i) \
if (a[i] != b[i]) \
return a[i] < b[i] ? -1 : 1; \
return 0; \
}
DEFINE_COMPAREITEMS(b, signed char)
DEFINE_COMPAREITEMS(BB, unsigned char)
DEFINE_COMPAREITEMS(w, Py_UCS4)
DEFINE_COMPAREITEMS(h, short)
DEFINE_COMPAREITEMS(HH, unsigned short)
DEFINE_COMPAREITEMS(i, int)
DEFINE_COMPAREITEMS(II, unsigned int)
DEFINE_COMPAREITEMS(l, long)
DEFINE_COMPAREITEMS(LL, unsigned long)
DEFINE_COMPAREITEMS(q, long long)
DEFINE_COMPAREITEMS(QQ, unsigned long long)
/* Description of types.
*
* Don't forget to update typecode_to_mformat_code() if you add a new
* typecode.
*/
static const struct arraydescr descriptors[] = {
{"b", 1, b_getitem, b_setitem, b_compareitems, 1, 1},
{"B", 1, BB_getitem, BB_setitem, BB_compareitems, 1, 0},
{"w", sizeof(Py_UCS4), w_getitem, w_setitem, w_compareitems, 0, 0,},
{"h", sizeof(short), h_getitem, h_setitem, h_compareitems, 1, 1},
{"H", sizeof(short), HH_getitem, HH_setitem, HH_compareitems, 1, 0},
{"i", sizeof(int), i_getitem, i_setitem, i_compareitems, 1, 1},
{"I", sizeof(int), II_getitem, II_setitem, II_compareitems, 1, 0},
{"l", sizeof(long), l_getitem, l_setitem, l_compareitems, 1, 1},
{"L", sizeof(long), LL_getitem, LL_setitem, LL_compareitems, 1, 0},
{"q", sizeof(long long), q_getitem, q_setitem, q_compareitems, 1, 1},
{"Q", sizeof(long long), QQ_getitem, QQ_setitem, QQ_compareitems, 1, 0},
{"e", sizeof(short), e_getitem, e_setitem, NULL, 0, 0},
{"f", sizeof(float), f_getitem, f_setitem, NULL, 0, 0},
{"d", sizeof(double), d_getitem, d_setitem, NULL, 0, 0},
{"Zf", 2*sizeof(float), cf_getitem, cf_setitem, NULL, 0, 0},
{"Zd", 2*sizeof(double), cd_getitem, cd_setitem, NULL, 0, 0},
{"", 0, 0, 0, 0, 0, 0} /* Sentinel */
};
/****************************************************************************
Implementations of array object methods.
****************************************************************************/
/*[clinic input]
class array.array "arrayobject *" "ArrayType"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=a5c29edf59f176a3]*/
static PyObject *
newarrayobject(PyTypeObject *type, Py_ssize_t size, const struct arraydescr *descr)
{
arrayobject *op;
size_t nbytes;
if (size < 0) {
PyErr_BadInternalCall();
return NULL;
}
/* Check for overflow */
if (size > PY_SSIZE_T_MAX / descr->itemsize) {
return PyErr_NoMemory();
}
nbytes = size * descr->itemsize;
op = (arrayobject *) type->tp_alloc(type, 0);
if (op == NULL) {
return NULL;
}
op->ob_descr = descr;
op->allocated = size;
op->weakreflist = NULL;
Py_SET_SIZE(op, size);
if (size <= 0) {
op->ob_item = NULL;
}
else {
op->ob_item = PyMem_NEW(char, nbytes);
if (op->ob_item == NULL) {
Py_DECREF(op);
return PyErr_NoMemory();
}
}
op->ob_exports = 0;
return (PyObject *) op;
}
static PyObject *
getarrayitem(PyObject *op, Py_ssize_t i)
{
#ifndef NDEBUG
array_state *state = find_array_state_by_type(Py_TYPE(op));
assert(array_Check(op, state));
#endif
arrayobject *ap;
ap = (arrayobject *)op;
assert(i>=0 && i<Py_SIZE(ap));
return (*ap->ob_descr->getitem)(ap, i);
}
static int
ins1(arrayobject *self, Py_ssize_t where, PyObject *v)
{
char *items;
Py_ssize_t n = Py_SIZE(self);
if (v == NULL) {
PyErr_BadInternalCall();
return -1;
}
if ((*self->ob_descr->setitem)(self, -1, v) < 0)
return -1;
if (array_resize(self, n+1) == -1)
return -1;
items = self->ob_item;
if (where < 0) {
where += n;
if (where < 0)
where = 0;
}
if (where > n)
where = n;
/* appends don't need to call memmove() */
if (where != n)
memmove(items + (where+1)*self->ob_descr->itemsize,
items + where*self->ob_descr->itemsize,
(n-where)*self->ob_descr->itemsize);
return (*self->ob_descr->setitem)(self, where, v);
}
/* Methods */
static void
array_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
arrayobject *self = arrayobject_CAST(op);
FT_CLEAR_WEAKREFS(op, self->weakreflist);
if (self->ob_item != NULL) {
PyMem_Free(self->ob_item);
}
tp->tp_free(op);
Py_DECREF(tp);
}
static PyObject *
array_richcompare(PyObject *v, PyObject *w, int op)
{
array_state *state = find_array_state_by_type(Py_TYPE(v));
arrayobject *va, *wa;
PyObject *vi = NULL;
PyObject *wi = NULL;
Py_ssize_t i, k;
PyObject *res;
if (!array_Check(v, state) || !array_Check(w, state))
Py_RETURN_NOTIMPLEMENTED;
va = (arrayobject *)v;
wa = (arrayobject *)w;
if (Py_SIZE(va) != Py_SIZE(wa) && (op == Py_EQ || op == Py_NE)) {
/* Shortcut: if the lengths differ, the arrays differ */
if (op == Py_EQ)
res = Py_False;
else
res = Py_True;
return Py_NewRef(res);
}
if (va->ob_descr == wa->ob_descr && va->ob_descr->compareitems != NULL) {
/* Fast path:
arrays with same types can have their buffers compared directly */
Py_ssize_t common_length = Py_MIN(Py_SIZE(va), Py_SIZE(wa));
int result = va->ob_descr->compareitems(va->ob_item, wa->ob_item,
common_length);
if (result == 0)
goto compare_sizes;
int cmp;
switch (op) {
case Py_LT: cmp = result < 0; break;
case Py_LE: cmp = result <= 0; break;
case Py_EQ: cmp = result == 0; break;
case Py_NE: cmp = result != 0; break;
case Py_GT: cmp = result > 0; break;
case Py_GE: cmp = result >= 0; break;
default: return NULL; /* cannot happen */
}
PyObject *res = cmp ? Py_True : Py_False;
return Py_NewRef(res);
}
/* Search for the first index where items are different */
k = 1;
for (i = 0; i < Py_SIZE(va) && i < Py_SIZE(wa); i++) {
vi = getarrayitem(v, i);
if (vi == NULL) {
return NULL;
}
wi = getarrayitem(w, i);
if (wi == NULL) {
Py_DECREF(vi);
return NULL;
}
k = PyObject_RichCompareBool(vi, wi, Py_EQ);
if (k == 0)
break; /* Keeping vi and wi alive! */
Py_DECREF(vi);
Py_DECREF(wi);
if (k < 0)
return NULL;
}
if (k) {
/* No more items to compare -- compare sizes */
compare_sizes: ;
Py_ssize_t vs = Py_SIZE(va);
Py_ssize_t ws = Py_SIZE(wa);
int cmp;
switch (op) {
case Py_LT: cmp = vs < ws; break;
case Py_LE: cmp = vs <= ws; break;
/* If the lengths were not equal,
the earlier fast-path check would have caught that. */
case Py_EQ: assert(vs == ws); cmp = 1; break;
case Py_NE: assert(vs == ws); cmp = 0; break;
case Py_GT: cmp = vs > ws; break;
case Py_GE: cmp = vs >= ws; break;
default: return NULL; /* cannot happen */
}
if (cmp)
res = Py_True;
else
res = Py_False;
return Py_NewRef(res);
}
/* We have an item that differs. First, shortcuts for EQ/NE */
if (op == Py_EQ) {
res = Py_NewRef(Py_False);
}
else if (op == Py_NE) {
res = Py_NewRef(Py_True);
}
else {
/* Compare the final item again using the proper operator */
res = PyObject_RichCompare(vi, wi, op);
}
Py_DECREF(vi);
Py_DECREF(wi);
return res;
}
static Py_ssize_t
array_length(PyObject *op)
{
return Py_SIZE(op);
}
static PyObject *
array_item(PyObject *op, Py_ssize_t i)
{
if (i < 0 || i >= Py_SIZE(op)) {
PyErr_SetString(PyExc_IndexError, "array index out of range");
return NULL;
}
return getarrayitem(op, i);
}
static PyObject *
array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
{
array_state *state = find_array_state_by_type(Py_TYPE(a));
arrayobject *np;
if (ilow < 0)
ilow = 0;
else if (ilow > Py_SIZE(a))
ilow = Py_SIZE(a);
if (ihigh < 0)
ihigh = 0;
if (ihigh < ilow)
ihigh = ilow;
else if (ihigh > Py_SIZE(a))
ihigh = Py_SIZE(a);
np = (arrayobject *) newarrayobject(state->ArrayType, ihigh - ilow, a->ob_descr);
if (np == NULL)
return NULL;
if (ihigh > ilow) {
memcpy(np->ob_item, a->ob_item + ilow * a->ob_descr->itemsize,
(ihigh-ilow) * a->ob_descr->itemsize);
}
return (PyObject *)np;