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Improve Python 3.11 support #3694

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Mar 2, 2022
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12 changes: 10 additions & 2 deletions include/pybind11/detail/type_caster_base.h
Original file line number Diff line number Diff line change
Expand Up @@ -502,9 +502,10 @@ PYBIND11_NOINLINE std::string error_string() {
}

PyFrameObject *frame = trace->tb_frame;
Py_XINCREF(frame);
errorString += "\n\nAt:\n";
while (frame) {
# if PY_VERSION_HEX >= 0x03090000
# if PY_VERSION_HEX >= 0x030900B1
PyCodeObject *f_code = PyFrame_GetCode(frame);
# else
PyCodeObject *f_code = frame->f_code;
Expand All @@ -514,7 +515,14 @@ PYBIND11_NOINLINE std::string error_string() {
errorString += " " + handle(f_code->co_filename).cast<std::string>() + "("
+ std::to_string(lineno)
+ "): " + handle(f_code->co_name).cast<std::string>() + "\n";
frame = frame->f_back;
# if PY_VERSION_HEX >= 0x030900B1
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Nit: Maybe we should add a backport section details/common.h . I just wasn't sure if the recommend static inline stuff would cause any nasty ODR / LTO issues so I left it as is.

auto *b_frame = PyFrame_GetBack(frame);
# else
auto *b_frame = frame->f_back;
Py_XINCREF(b_frame);
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# endif
Py_DECREF(frame);
frame = b_frame;
Py_DECREF(f_code);
}
}
Expand Down
11 changes: 5 additions & 6 deletions include/pybind11/pybind11.h
Original file line number Diff line number Diff line change
Expand Up @@ -2636,19 +2636,18 @@ get_type_override(const void *this_ptr, const type_info *this_type, const char *

/* Don't call dispatch code if invoked from overridden function.
Unfortunately this doesn't work on PyPy. */
#if !defined(PYPY_VERSION) && PY_VERSION_HEX < 0x030B0000
// TODO: Remove PyPy workaround for Python 3.11.
// Current API fails on 3.11 since co_varnames can be null.
#if !defined(PYPY_VERSION)
# if PY_VERSION_HEX >= 0x03090000
PyFrameObject *frame = PyThreadState_GetFrame(PyThreadState_Get());
if (frame != nullptr) {
PyCodeObject *f_code = PyFrame_GetCode(frame);
// f_code is guaranteed to not be NULL
if ((std::string) str(f_code->co_name) == name && f_code->co_argcount > 0) {
PyObject *locals = PyEval_GetLocals();
if (locals != nullptr && f_code->co_varnames != nullptr) {
PyObject *self_caller
= dict_getitem(locals, PyTuple_GET_ITEM(f_code->co_varnames, 0));
if (locals != nullptr) {
PyObject *self_arg = PyTuple_GET_ITEM(
PyObject_GetAttrString((PyObject *) f_code, "co_varnames"), 0);
PyObject *self_caller = dict_getitem(locals, self_arg);
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if (self_caller == self.ptr()) {
Py_DECREF(f_code);
Py_DECREF(frame);
Expand Down