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""" |
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Taken verbatim from Jinja2. |
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4
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https://github.com/mitsuhiko/jinja2/blob/master/jinja2/debug.py#L267 |
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""" |
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import platform |
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import sys |
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9
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def _init_ugly_crap(): |
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"""This function implements a few ugly things so that we can patch the |
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traceback objects. The function returned allows resetting `tb_next` on |
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any python traceback object. Do not attempt to use this on non cpython |
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interpreters |
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""" |
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import ctypes |
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from types import TracebackType |
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# figure out side of _Py_ssize_t |
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if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'): |
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_Py_ssize_t = ctypes.c_int64 |
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else: |
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_Py_ssize_t = ctypes.c_int |
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# regular python |
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class _PyObject(ctypes.Structure): |
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pass |
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_PyObject._fields_ = [ |
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('ob_refcnt', _Py_ssize_t), |
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('ob_type', ctypes.POINTER(_PyObject)) |
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] |
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# python with trace |
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if hasattr(sys, 'getobjects'): |
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class _PyObject(ctypes.Structure): |
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pass |
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_PyObject._fields_ = [ |
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('_ob_next', ctypes.POINTER(_PyObject)), |
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('_ob_prev', ctypes.POINTER(_PyObject)), |
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('ob_refcnt', _Py_ssize_t), |
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('ob_type', ctypes.POINTER(_PyObject)) |
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] |
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class _Traceback(_PyObject): |
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pass |
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_Traceback._fields_ = [ |
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('tb_next', ctypes.POINTER(_Traceback)), |
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('tb_frame', ctypes.POINTER(_PyObject)), |
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('tb_lasti', ctypes.c_int), |
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('tb_lineno', ctypes.c_int) |
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] |
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56
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def tb_set_next(tb, next): |
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"""Set the tb_next attribute of a traceback object.""" |
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if not (isinstance(tb, TracebackType) and (next is None or isinstance(next, TracebackType))): |
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raise TypeError('tb_set_next arguments must be traceback objects') |
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obj = _Traceback.from_address(id(tb)) |
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if tb.tb_next is not None: |
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old = _Traceback.from_address(id(tb.tb_next)) |
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old.ob_refcnt -= 1 |
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if next is None: |
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obj.tb_next = ctypes.POINTER(_Traceback)() |
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else: |
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next = _Traceback.from_address(id(next)) |
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next.ob_refcnt += 1 |
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obj.tb_next = ctypes.pointer(next) |
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71
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return tb_set_next |
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73
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74
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tb_set_next = None |
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75
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try: |
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if platform.python_implementation() == 'CPython': |
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tb_set_next = _init_ugly_crap() |
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except Exception as exc: |
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sys.stderr.write("Failed to initialize cpython support: {!r}".format(exc)) |
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del _init_ugly_crap |
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ionelmc /
python-tblib
