simple_instructions.py 文件源码

def ROT_TWO(self, instr):

        one = self.ast_stack.pop()
        two = self.ast_stack.pop()

        if self.ilst[0].opname == 'STORE_NAME':

            kw = dict(lineno=instr.lineno, col_offset=0)
            stores = []
            while self.ilst[0].opname == 'STORE_NAME':
                stores.append(self.ilst.pop(0))

            assert len(stores) <= 3, stores
            elts_load = [one, two]
            if len(stores) == 3:
                elts_load.insert(0, self.ast_stack.pop())

            tup_load = _ast.Tuple(elts=elts_load[::-1], ctx=_ast.Load(), **kw)

            elts_store = [_ast.Name(id=store.arg, ctx=_ast.Store(), **kw) for store in stores]
            tup_store = _ast.Tuple(elts=elts_store, ctx=_ast.Store(), **kw)

            assgn = _ast.Assign(value=tup_load, targets=[tup_store], **kw)
            self.ast_stack.append(assgn)
#            self.ast_stack.append(tup_store)
        else:
            self.ast_stack.append(one)
            self.ast_stack.append(two)