verifier.py 文件源码

def __init__(self, ffi, preamble, tmpdir=None, modulename=None,
                 ext_package=None, tag='', force_generic_engine=False,
                 source_extension='.c', flags=None, relative_to=None, **kwds):
        if ffi._parser._uses_new_feature:
            raise ffiplatform.VerificationError(
                "feature not supported with ffi.verify(), but only "
                "with ffi.set_source(): %s" % (ffi._parser._uses_new_feature,))
        self.ffi = ffi
        self.preamble = preamble
        if not modulename:
            flattened_kwds = ffiplatform.flatten(kwds)
        vengine_class = _locate_engine_class(ffi, force_generic_engine)
        self._vengine = vengine_class(self)
        self._vengine.patch_extension_kwds(kwds)
        self.flags = flags
        self.kwds = self.make_relative_to(kwds, relative_to)
        #
        if modulename:
            if tag:
                raise TypeError("can't specify both 'modulename' and 'tag'")
        else:
            key = '\x00'.join([sys.version[:3], __version_verifier_modules__,
                               preamble, flattened_kwds] +
                              ffi._cdefsources)
            if sys.version_info >= (3,):
                key = key.encode('utf-8')
            k1 = hex(binascii.crc32(key[0::2]) & 0xffffffff)
            k1 = k1.lstrip('0x').rstrip('L')
            k2 = hex(binascii.crc32(key[1::2]) & 0xffffffff)
            k2 = k2.lstrip('0').rstrip('L')
            modulename = '_cffi_%s_%s%s%s' % (tag, self._vengine._class_key,
                                              k1, k2)
        suffix = _get_so_suffixes()[0]
        self.tmpdir = tmpdir or _caller_dir_pycache()
        self.sourcefilename = os.path.join(self.tmpdir, modulename + source_extension)
        self.modulefilename = os.path.join(self.tmpdir, modulename + suffix)
        self.ext_package = ext_package
        self._has_source = False
        self._has_module = False