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// gh-91321: Very basic C++ test extension to check that the Python C API is
// compatible with C++ and does not emit C++ compiler warnings.
// Always enable assertions
#undef NDEBUG
#include "Python.h"
PyDoc_STRVAR(_testcppext_add_doc,
"add(x, y)\n"
"\n"
"Return the sum of two integers: x + y.");
static PyObject *
_testcppext_add(PyObject *Py_UNUSED(module), PyObject *args)
{
long i, j;
if (!PyArg_ParseTuple(args, "ll:foo", &i, &j)) {
return nullptr;
}
long res = i + j;
return PyLong_FromLong(res);
}
// Class to test operator casting an object to PyObject*
class StrongRef
{
public:
StrongRef(PyObject *obj) : m_obj(obj) {
Py_INCREF(this->m_obj);
}
~StrongRef() {
Py_DECREF(this->m_obj);
}
// Cast to PyObject*: get a borrowed reference
inline operator PyObject*() const { return this->m_obj; }
private:
PyObject *m_obj; // Strong reference
};
static PyObject *
test_api_casts(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
PyObject *obj = Py_BuildValue("(ii)", 1, 2);
if (obj == nullptr) {
return nullptr;
}
Py_ssize_t refcnt = Py_REFCNT(obj);
assert(refcnt >= 1);
// gh-92138: For backward compatibility, functions of Python C API accepts
// "const PyObject*". Check that using it does not emit C++ compiler
// warnings.
const PyObject *const_obj = obj;
Py_INCREF(const_obj);
Py_DECREF(const_obj);
PyTypeObject *type = Py_TYPE(const_obj);
assert(Py_REFCNT(const_obj) == refcnt);
assert(type == &PyTuple_Type);
assert(PyTuple_GET_SIZE(const_obj) == 2);
PyObject *one = PyTuple_GET_ITEM(const_obj, 0);
assert(PyLong_AsLong(one) == 1);
// gh-92898: StrongRef doesn't inherit from PyObject but has an operator to
// cast to PyObject*.
StrongRef strong_ref(obj);
assert(Py_TYPE(strong_ref) == &PyTuple_Type);
assert(Py_REFCNT(strong_ref) == (refcnt + 1));
Py_INCREF(strong_ref);
Py_DECREF(strong_ref);
// gh-93442: Pass 0 as NULL for PyObject*
Py_XINCREF(0);
Py_XDECREF(0);
Py_DECREF(obj);
Py_RETURN_NONE;
}
static PyObject *
test_unicode(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
PyObject *str = PyUnicode_FromString("abc");
if (str == nullptr) {
return nullptr;
}
assert(PyUnicode_Check(str));
assert(PyUnicode_GET_LENGTH(str) == 3);
// gh-92800: test PyUnicode_READ()
const void* data = PyUnicode_DATA(str);
assert(data != nullptr);
int kind = PyUnicode_KIND(str);
assert(kind == PyUnicode_1BYTE_KIND);
assert(PyUnicode_READ(kind, data, 0) == 'a');
// gh-92800: test PyUnicode_READ() casts
const void* const_data = PyUnicode_DATA(str);
unsigned int ukind = static_cast<unsigned int>(kind);
assert(PyUnicode_READ(ukind, const_data, 2) == 'c');
assert(PyUnicode_READ_CHAR(str, 1) == 'b');
Py_DECREF(str);
Py_RETURN_NONE;
}
static PyMethodDef _testcppext_methods[] = {
{"add", _testcppext_add, METH_VARARGS, _testcppext_add_doc},
{"test_api_casts", test_api_casts, METH_NOARGS, nullptr},
{"test_unicode", test_unicode, METH_NOARGS, nullptr},
{nullptr, nullptr, 0, nullptr} /* sentinel */
};
static int
_testcppext_exec(PyObject *module)
{
if (PyModule_AddIntMacro(module, __cplusplus) < 0) {
return -1;
}
return 0;
}
static PyModuleDef_Slot _testcppext_slots[] = {
{Py_mod_exec, reinterpret_cast<void*>(_testcppext_exec)},
{0, nullptr}
};
PyDoc_STRVAR(_testcppext_doc, "C++ test extension.");
static struct PyModuleDef _testcppext_module = {
PyModuleDef_HEAD_INIT, // m_base
"_testcppext", // m_name
_testcppext_doc, // m_doc
0, // m_size
_testcppext_methods, // m_methods
_testcppext_slots, // m_slots
nullptr, // m_traverse
nullptr, // m_clear
nullptr, // m_free
};
PyMODINIT_FUNC
PyInit__testcppext(void)
{
return PyModuleDef_Init(&_testcppext_module);
}
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