vengine_cpy.py 文件源码

def load_library(self, flags=None):
        # XXX review all usages of 'self' here!
        # import it as a new extension module
        imp.acquire_lock()
        try:
            if hasattr(sys, "getdlopenflags"):
                previous_flags = sys.getdlopenflags()
            try:
                if hasattr(sys, "setdlopenflags") and flags is not None:
                    sys.setdlopenflags(flags)
                module = imp.load_dynamic(self.verifier.get_module_name(),
                                          self.verifier.modulefilename)
            except ImportError as e:
                error = "importing %r: %s" % (self.verifier.modulefilename, e)
                raise ffiplatform.VerificationError(error)
            finally:
                if hasattr(sys, "setdlopenflags"):
                    sys.setdlopenflags(previous_flags)
        finally:
            imp.release_lock()
        #
        # call loading_cpy_struct() to get the struct layout inferred by
        # the C compiler
        self._load(module, 'loading')
        #
        # the C code will need the <ctype> objects.  Collect them in
        # order in a list.
        revmapping = dict([(value, key)
                           for (key, value) in self._typesdict.items()])
        lst = [revmapping[i] for i in range(len(revmapping))]
        lst = list(map(self.ffi._get_cached_btype, lst))
        #
        # build the FFILibrary class and instance and call _cffi_setup().
        # this will set up some fields like '_cffi_types', and only then
        # it will invoke the chained list of functions that will really
        # build (notably) the constant objects, as <cdata> if they are
        # pointers, and store them as attributes on the 'library' object.
        class FFILibrary(object):
            _cffi_python_module = module
            _cffi_ffi = self.ffi
            _cffi_dir = []
            def __dir__(self):
                return FFILibrary._cffi_dir + list(self.__dict__)
        library = FFILibrary()
        if module._cffi_setup(lst, ffiplatform.VerificationError, library):
            import warnings
            warnings.warn("reimporting %r might overwrite older definitions"
                          % (self.verifier.get_module_name()))
        #
        # finally, call the loaded_cpy_xxx() functions.  This will perform
        # the final adjustments, like copying the Python->C wrapper
        # functions from the module to the 'library' object, and setting
        # up the FFILibrary class with properties for the global C variables.
        self._load(module, 'loaded', library=library)
        module._cffi_original_ffi = self.ffi
        module._cffi_types_of_builtin_funcs = self._types_of_builtin_functions
        return library