From 35933b3ed7bfdab377d2418f3c566053ebbca87e Mon Sep 17 00:00:00 2001
From: Alexander Shadchin <alexandr.shadchin@gmail.com>
Date: Sun, 14 Aug 2022 21:13:49 +0300
Subject: [PATCH] Fix build with Python 3.11

The PyFrameObject structure members have been removed from the public C API.
---
 python/google/protobuf/pyext/descriptor.cc | 45 ++++++++++++++++++++--
 1 file changed, 41 insertions(+), 4 deletions(-)

diff --git a/python/google/protobuf/pyext/descriptor.cc b/python/google/protobuf/pyext/descriptor.cc
index 75f1760ccf45..951ba46bce55 100644
--- a/python/google/protobuf/pyext/descriptor.cc
+++ b/python/google/protobuf/pyext/descriptor.cc
@@ -63,6 +63,43 @@
                        : PyBytes_AsStringAndSize(ob, (charpp), (sizep)))
 #endif
 
+#if PY_VERSION_HEX < 0x030900B1 && !defined(PYPY_VERSION)
+static inline PyCodeObject* PyFrame_GetCode(PyFrameObject *frame)
+{
+    Py_INCREF(frame->f_code);
+    return frame->f_code;
+}
+
+static inline PyFrameObject* PyFrame_GetBack(PyFrameObject *frame)
+{
+    Py_XINCREF(frame->f_back);
+    return frame->f_back;
+}
+#endif
+
+#if PY_VERSION_HEX < 0x030B00A7 && !defined(PYPY_VERSION)
+static inline PyObject* PyFrame_GetLocals(PyFrameObject *frame)
+{
+#if PY_VERSION_HEX >= 0x030400B1
+    if (PyFrame_FastToLocalsWithError(frame) < 0) {
+        return NULL;
+    }
+#else
+    PyFrame_FastToLocals(frame);
+#endif
+    Py_INCREF(frame->f_locals);
+    return frame->f_locals;
+}
+#endif
+
+#if PY_VERSION_HEX < 0x030B00A7 && !defined(PYPY_VERSION)
+static inline PyObject* PyFrame_GetGlobals(PyFrameObject *frame)
+{
+    Py_INCREF(frame->f_globals);
+    return frame->f_globals;
+}
+#endif
+
 namespace google {
 namespace protobuf {
 namespace python {
@@ -105,18 +142,18 @@ bool _CalledFromGeneratedFile(int stacklevel) {
     return false;
   }
   while (stacklevel-- > 0) {
-    frame = frame->f_back;
+    frame = PyFrame_GetBack(frame);
     if (frame == NULL) {
       return false;
     }
   }
 
-  if (frame->f_code->co_filename == NULL) {
+  if (PyFrame_GetCode(frame)->co_filename == NULL) {
     return false;
   }
   char* filename;
   Py_ssize_t filename_size;
-  if (PyString_AsStringAndSize(frame->f_code->co_filename,
+  if (PyString_AsStringAndSize(PyFrame_GetCode(frame)->co_filename,
                                &filename, &filename_size) < 0) {
     // filename is not a string.
     PyErr_Clear();
@@ -137,7 +174,7 @@ bool _CalledFromGeneratedFile(int stacklevel) {
     return false;
   }
 
-  if (frame->f_globals != frame->f_locals) {
+  if (PyFrame_GetGlobals(frame) != PyFrame_GetLocals(frame)) {
     // Not at global module scope
     return false;
   }