python的 CALL_FUNCTION

 case CALL_FUNCTION:
        {
            PyObject **sp;
            PCALL(PCALL_ALL);
            sp = stack_pointer;
#ifdef WITH_TSC
            x = call_function(&sp, oparg, &intr0, &intr1);
#else
            x = call_function(&sp, oparg);
#endif
            stack_pointer = sp;
            PUSH(x);
            if (x != NULL)
                continue;
            break;
        }

        case CALL_FUNCTION_VAR:
        case CALL_FUNCTION_KW:
        case CALL_FUNCTION_VAR_KW:
        {
            int na = oparg & 0xff;
            int nk = (oparg>>8) & 0xff;
            int flags = (opcode - CALL_FUNCTION) & 3;
            int n = na + 2 * nk;
            PyObject **pfunc, *func, **sp;
            PCALL(PCALL_ALL);
            if (flags & CALL_FLAG_VAR)
                n++;
            if (flags & CALL_FLAG_KW)
                n++;
            pfunc = stack_pointer - n - 1;
            func = *pfunc;

            if (PyMethod_Check(func)
                && PyMethod_GET_SELF(func) != NULL) {
                PyObject *self = PyMethod_GET_SELF(func);
                Py_INCREF(self);
                func = PyMethod_GET_FUNCTION(func);
                Py_INCREF(func);
                Py_DECREF(*pfunc);
                *pfunc = self;
                na++;
            } else
                Py_INCREF(func);
            sp = stack_pointer;
            READ_TIMESTAMP(intr0);
            x = ext_do_call(func, &sp, flags, na, nk);
            READ_TIMESTAMP(intr1);
            stack_pointer = sp;
            Py_DECREF(func);

            while (stack_pointer > pfunc) {
                w = POP();
                Py_DECREF(w);
            }
            PUSH(x);
            if (x != NULL)
                continue;
            break;
        }