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I searched for "\<_f" regex in Cython (0.29.x) branch. I found the following code getting or setting PyFrameObject fields.
== Set f_back ==
__Pyx_Coroutine_SendEx() at Utility/Coroutine.c:721:
 f->f_back = PyThreadState_GetFrame(tstate);
__Pyx_Coroutine_ResetFrameBackpointer() at Utility/Coroutine.c:775:
 Py_CLEAR(f->f_back);
== Set f_lineno ==
__Pyx_PyFrame_SetLineNumber() at Utility/ModuleSetupCode.c:543:
 #define __Pyx_PyFrame_SetLineNumber(frame, lineno) (frame)->f_lineno = (lineno)
__Pyx_PyFrame_SetLineNumber() is called by 3 functions:
* __Pyx_AddTraceback()
* __Pyx_call_line_trace_func()
* __Pyx_TraceSetupAndCall()
__Pyx_AddTraceback() pseudo-code:
static void __Pyx_AddTraceback(const char *funcname, int c_line,
 int py_line, const char *filename)
{
 py_frame = PyFrame_New(..., py_code, ...);
 __Pyx_PyFrame_SetLineNumber(py_frame, py_line);
 ...
}
== f_localsplus ==
If the CYTHON_FAST_PYCALL macro is defined, sizeof(PyFrameObject) is used to get the f_localsplus member.
__Pyx_PyFrame_GetLocalsplus() at Utility/ObjectHandling.c:1996:
---
// Initialised by module init code.
static size_t __pyx_pyframe_localsplus_offset = 0;
#include "frameobject.h"
#define __Pxy_PyFrame_Initialize_Offsets() \
 ((void)__Pyx_BUILD_ASSERT_EXPR(sizeof(PyFrameObject) == offsetof(PyFrameObject, f_localsplus) + Py_MEMBER_SIZE(PyFrameObject, f_localsplus)), \
 (void)(__pyx_pyframe_localsplus_offset = ((size_t)PyFrame_Type.tp_basicsize) - Py_MEMBER_SIZE(PyFrameObject, f_localsplus)))
#define __Pyx_PyFrame_GetLocalsplus(frame) \
 (assert(__pyx_pyframe_localsplus_offset), (PyObject **)(((char *)(frame)) + __pyx_pyframe_localsplus_offset))
---
== Get f_trace ==
__Pyx_TraceLine() at Utility/Profile.c:238:
 if (__Pyx_IsTracing(tstate, 0, 0) && tstate->c_tracefunc && $frame_cname->f_trace)
== Set f_frame ==
__Pyx_TraceSetupAndCall() at Utility/Profile.c:299:
 (*frame)->f_tstate = tstate;