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//proc/self/root/usr/lib64/python3.6/asyncio/base_tasks.py

import linecache
import traceback

from . import base_futures
from . import coroutines

def _task_repr_info(task):
    info = base_futures._future_repr_info(task)

if task._must_cancel:
        # replace status
        info[0] = 'cancelling'

coro = coroutines._format_coroutine(task._coro)
    info.insert(1, 'coro=<%s>' % coro)

if task._fut_waiter is not None:
        info.insert(2, 'wait_for=%r' % task._fut_waiter)
    return info

def _task_get_stack(task, limit):
    frames = []
    try:
        # 'async def' coroutines
        f = task._coro.cr_frame
    except AttributeError:
        f = task._coro.gi_frame
    if f is not None:
        while f is not None:
            if limit is not None:
                if limit <= 0:
                    break
                limit -= 1
            frames.append(f)
            f = f.f_back
        frames.reverse()
    elif task._exception is not None:
        tb = task._exception.__traceback__
        while tb is not None:
            if limit is not None:
                if limit <= 0:
                    break
                limit -= 1
            frames.append(tb.tb_frame)
            tb = tb.tb_next
    return frames

def _task_print_stack(task, limit, file):
    extracted_list = []
    checked = set()
    for f in task.get_stack(limit=limit):
        lineno = f.f_lineno
        co = f.f_code
        filename = co.co_filename
        name = co.co_name
        if filename not in checked:
            checked.add(filename)
            linecache.checkcache(filename)
        line = linecache.getline(filename, lineno, f.f_globals)
        extracted_list.append((filename, lineno, name, line))
    exc = task._exception
    if not extracted_list:
        print('No stack for %r' % task, file=file)
    elif exc is not None:
        print('Traceback for %r (most recent call last):' % task,
              file=file)
    else:
        print('Stack for %r (most recent call last):' % task,
              file=file)
    traceback.print_list(extracted_list, file=file)
    if exc is not None:
        for line in traceback.format_exception_only(exc.__class__, exc):
            print(line, file=file, end='')