cpython/Modules/arraymodule.c at main · python/cpython · GitHub

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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_object.h" // _PyObject_GC_TRACK()

#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_untracked(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 *) _PyType_AllocNoTrack(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 *

newarrayobject(PyTypeObject *type, Py_ssize_t size, const struct arraydescr *descr)

{

PyObject *op = newarrayobject_untracked(type, size, descr);

if (op != NULL) {

_PyObject_GC_TRACK(op);

}

return 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;

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