Python: include Python stack trace in the crash log

This helps Python developers troubleshoot errors when
Python causes a crash.

2 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/python/generic/py_capi_utils.c b/source/blender/python/generic/py_capi_utils.c
index 9c84a4bb824..0a4f3b5bebd 100644
--- a/source/blender/python/generic/py_capi_utils.c
+++ b/source/blender/python/generic/py_capi_utils.c
@@ -360,6 +360,20 @@ void PyC_StackSpit(void)
   }
 }
 
+void PyC_StackPrint(FILE *fp)
+{
+  PyThreadState *tstate = PyGILState_GetThisThreadState();
+  if (tstate != NULL && tstate->frame != NULL) {
+    PyFrameObject *frame = tstate->frame;
+    do {
+      const int line = PyCode_Addr2Line(frame->f_code, frame->f_lasti);
+      const char *filename = _PyUnicode_AsString(frame->f_code->co_filename);
+      const char *funcname = _PyUnicode_AsString(frame->f_code->co_name);
+      fprintf(fp, "  File \"%s\", line %d in %s\n", filename, line, funcname);
+    } while ((frame = frame->f_back));
+  }
+}
+
 void PyC_FileAndNum(const char **r_filename, int *r_lineno)
 {
   PyFrameObject *frame;
diff --git a/source/blender/python/generic/py_capi_utils.h b/source/blender/python/generic/py_capi_utils.h
index e8b2e8ff502..7950ee2c968 100644
--- a/source/blender/python/generic/py_capi_utils.h
+++ b/source/blender/python/generic/py_capi_utils.h
@@ -28,6 +28,7 @@ void PyC_ObSpit(const char *name, PyObject *var);
 void PyC_ObSpitStr(char *result, size_t result_len, PyObject *var);
 void PyC_LineSpit(void);
 void PyC_StackSpit(void);
+void PyC_StackPrint(FILE *fp);
 PyObject *PyC_ExceptionBuffer(void);
 PyObject *PyC_ExceptionBuffer_Simple(void);
 PyObject *PyC_Object_GetAttrStringArgs(PyObject *o, Py_ssize_t n, ...);