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#pragma once
#include <torch/csrc/python_headers.h>
// PyPy 3.6 does not yet have PySlice_Unpack
#if PY_VERSION_HEX < 0x03060100 || defined(PYPY_VERSION)
// PySlice_Unpack not introduced till python 3.6.1
// included here for backwards compatibility
// https://docs.python.org/3/c-api/slice.html#c.PySlice_Unpack
// https://github.com/python/cpython/blob/master/Objects/sliceobject.c#L196
inline int
__PySlice_Unpack(PyObject *_r,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
{
PySliceObject *r = (PySliceObject*)_r;
/* this is harder to get right than you might think */
// Py_BUILD_ASSERT replaced because it is not available in all versions
static_assert(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX, "Build failed");
if (r->step == Py_None) {
*step = 1;
}
else {
if (!_PyEval_SliceIndex(r->step, step)) return -1;
if (*step == 0) {
PyErr_SetString(PyExc_ValueError,
"slice step cannot be zero");
return -1;
}
/* Here *step might be -PY_SSIZE_T_MAX-1; in this case we replace it
* with -PY_SSIZE_T_MAX. This doesn't affect the semantics, and it
* guards against later undefined behaviour resulting from code that
* does "step = -step" as part of a slice reversal.
*/
if (*step < -PY_SSIZE_T_MAX)
*step = -PY_SSIZE_T_MAX;
}
if (r->start == Py_None) {
*start = *step < 0 ? PY_SSIZE_T_MAX : 0;
}
else {
if (!_PyEval_SliceIndex(r->start, start)) return -1;
}
if (r->stop == Py_None) {
*stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX;
}
else {
if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
}
return 0;
}
#define THPUtils_unpackSlice(SLICE, START, STOP, STEP) \
(__PySlice_Unpack(SLICE, START, STOP, STEP) == 0)
#else
#define THPUtils_unpackSlice(SLICE, START, STOP, STEP) \
(PySlice_Unpack(SLICE, START, STOP, STEP) == 0)
#endif
// https://bugsfiles.kde.org/attachment.cgi?id=61186
#if PY_VERSION_HEX >= 0x03020000
#define THPUtils_parseSlice(SLICE, LEN, START, STOP, LENGTH, STEP) \
(PySlice_GetIndicesEx(SLICE, LEN, START, STOP, LENGTH, STEP) == 0)
#else
#define THPUtils_parseSlice(SLICE, LEN, START, STOP, LENGTH, STEP) \
(PySlice_GetIndicesEx((PySliceObject*)SLICE, LEN, START, STOP, LENGTH, STEP) == 0)
#endif
// This function was introduced in Python 3.4
#if PY_VERSION_HEX < 0x03040000
inline int
PyGILState_Check() {
PyThreadState * tstate = _PyThreadState_Current;
return tstate && (tstate == PyGILState_GetThisThreadState());
}
#endif
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