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Viewing changes to bzrlib/_groupcompress_pyx.pyx

  • Committer: John Arbash Meinel
  • Date: 2010-08-02 17:08:29 UTC
  • mto: This revision was merged to the branch mainline in revision 5369.
  • Revision ID: john@arbash-meinel.com-20100802170829-l0ti5v5rvcua32ia
Pyrex doesn't allow sizeof(class), so we have to unroll it manually.

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bzrlib/_groupcompress_pyx.pyx
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cdef extern from "Python.h":
 
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    ctypedef struct PyObject:
 
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        pass
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    ctypedef int Py_ssize_t # Required for older pyrex versions
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    int PyString_CheckExact(object)
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    char * PyString_AS_STRING(object)
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    cdef readonly object _sources
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    cdef source_info *_source_infos
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    cdef delta_index *_index
 
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    cdef public unsigned long _source_offset
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    cdef readonly unsigned int _max_num_sources
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    cdef public unsigned long _source_offset
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    def __init__(self, source=None):
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        self._sources = []
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    def __sizeof__(self):
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        # We want to track the _source_infos allocations, but the referenced
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        # void* are actually tracked in _sources itself.
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        return (sizeof(DeltaIndex)
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            + (sizeof(source_info) * self._max_num_sources)
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            + sizeof_delta_index(self._index))
 
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        # XXX: Cython is capable of doing sizeof(class) and returning the size
 
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        #      of the underlying struct. Pyrex (<= 0.9.9) refuses, so we need
 
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        #      to do it manually. *sigh* Note that we might get it wrong
 
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        #      because of alignment issues.
 
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        cdef Py_ssize_t size
 
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        # PyObject start, vtable *, 3 object pointers, 2 C ints
 
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        size = ((sizeof(PyObject) + sizeof(void*) + 3*sizeof(PyObject*)
 
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                 + sizeof(unsigned long)
 
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                 + sizeof(unsigned int))
 
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                + (sizeof(source_info) * self._max_num_sources)
 
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                + sizeof_delta_index(self._index))
 
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        return size
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    def __repr__(self):
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        return '%s(%d, %d)' % (self.__class__.__name__,