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from libcpp cimport bool
cdef extern from "<exception>" namespace "std" nogil:
cdef cppclass exception_ptr:
bool operator bool()
exception_ptr make_exception_ptr[E](E e) noexcept
void rethrow_exception(exception_ptr) except +
# current_exception skipped because it'll be almost impossible to use from Cython
cdef extern from *:
"""
static void __Pyx_CppExn2PyErr(void);
CYTHON_UNUSED static void __pyx_deallocate_exception_ptr_capsule(PyObject *c) {
std::exception_ptr *ptr = static_cast<std::exception_ptr*>(
PyCapsule_GetPointer(c, "std::exception_ptr wrapper"));
delete ptr;
PyErr_Clear();
}
CYTHON_UNUSED static void __pyx_to_exception_ptr() {
try {
__Pyx_CppExn2PyErr(); // First do regular exception conversion
throw;
} catch (...) {
PyObject *type, *value, *tb;
PyErr_Fetch(&type, &value, &tb);
Py_XDECREF(value);
Py_XDECREF(tb);
std::exception_ptr *current = new std::exception_ptr(std::current_exception());
PyObject *capsule = PyCapsule_New(
static_cast<void*>(current),
"std::exception_ptr wrapper",
&__pyx_deallocate_exception_ptr_capsule);
if (!capsule)
delete current; // otherwise it'll be leaked
else
PyErr_SetObject(type ? type : PyExc_Exception, capsule);
Py_DECREF(type);
}
}
CYTHON_UNUSED static std::exception_ptr __pyx_wrapped_exception_ptr_from_exception(PyObject *e) {
PyObject *args = NULL, *arg0 = NULL;
std::exception_ptr result;
Py_ssize_t size;
#if __PYX_LIMITED_VERSION_HEX < 0x030C0000
args = PyObject_GetAttrString(e, "args");
#else
args = PyException_GetArgs(e);
#endif
if (!args)
goto done;
size = PyTuple_Size(args);
if (size != 1) {
if (size != -1)
PyErr_SetString(PyExc_ValueError, "exception args were not the expected length of 1");
goto done;
}
arg0 = PyTuple_GetItem(args, 0);
if (!arg0)
goto done;
{
std::exception_ptr* wrapped = static_cast<std::exception_ptr*>(
PyCapsule_GetPointer(arg0, "std::exception_ptr wrapper"));
if (!wrapped) {
goto done;
}
result = *wrapped;
}
done:
Py_XDECREF(args);
return result;
}
"""
# This can be used as `except +exception_ptr_error_handler`.
# It raises a generic Exception, with a wrapped exception_ptr as its value.
void exception_ptr_error_handler "__pyx_to_exception_ptr"() except *
# Extract the exception_ptr from a caught exception
exception_ptr wrapped_exception_ptr_from_exception "__pyx_wrapped_exception_ptr_from_exception"(e) except *
# Dummy inline function to force __Pyx_CppExn2PyErr to be included for utility code above
cdef inline void __pyx_call_rethrow_exception "__pyx_call_rethrow_exception"(exception_ptr e) except*:
rethrow_exception(e)
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