dead_code_elimination.py 文件源码

def visit(self, node):
        if self._return_level:
            if self._node_level == self._return_level:
                return None
            elif self._node_level < self._return_level:
                self._return_level = None
        if isinstance(node, ast.Return):
            self._return_level = self._node_level
        self._node_level += 1
        node = super().visit(node)
        self._node_level -= 1
        return node