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Use Cython's array to back Py_ssize_t[::1] #504

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Oct 22, 2024
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Use Cython's array to back Py_ssize_t[::1] #504

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15 changes: 8 additions & 7 deletions python/kvikio/kvikio/_lib/arr.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,13 @@
# cython: language_level=3


from cpython.array cimport array, newarrayobject
from cpython.buffer cimport PyBuffer_IsContiguous
from cpython.mem cimport PyMem_Free, PyMem_Malloc
from cpython.memoryview cimport PyMemoryView_FromObject, PyMemoryView_GET_BUFFER
from cpython.object cimport PyObject
from cpython.ref cimport Py_INCREF
from cpython.tuple cimport PyTuple_New, PyTuple_SET_ITEM
from cython cimport auto_pickle, boundscheck, initializedcheck, nonecheck, wraparound
from cython.view cimport array
from libc.stdint cimport uintptr_t
from libc.string cimport memcpy

Expand Down Expand Up @@ -53,13 +53,14 @@ cdef dict itemsize_mapping = {
}


cdef array array_Py_ssize_t = array("q")
cdef sizeof_Py_ssize_t = sizeof(Py_ssize_t)


cdef inline Py_ssize_t[::1] new_Py_ssize_t_array(Py_ssize_t n):
return newarrayobject(
(<PyObject*>array_Py_ssize_t).ob_type, n, array_Py_ssize_t.ob_descr
)
cdef Py_ssize_t[::1] new_Py_ssize_t_array(Py_ssize_t n):
cdef array a = array((n,), sizeof_Py_ssize_t, b"q", "c", False)
a.data = <char*>PyMem_Malloc(n * sizeof(Py_ssize_t))
a.callback_free_data = PyMem_Free
return a


@auto_pickle(False)
Expand Down