wrflib_objc_sys 0.0.3

// Copyright (c) 2021-present, Cruise LLC
//
// This source code is licensed under the Apache License, Version 2.0,
// found in the LICENSE-APACHE file in the root directory of this source tree.
// You may not use this file except in compliance with the License.

use std::any::Any;
use std::mem;

use super::{Message, MessageArguments, MessageError, Super};
use runtime::{Class, Imp, Object, Sel};

extern "C" {
    fn objc_msg_lookup(receiver: *mut Object, op: Sel) -> Imp;
    fn objc_msg_lookup_super(sup: *const Super, sel: Sel) -> Imp;
}

pub unsafe fn send_unverified<T, A, R>(obj: *const T, sel: Sel, args: A) -> Result<R, MessageError>
where
    T: Message,
    A: MessageArguments,
    R: Any,
{
    if obj.is_null() {
        return mem::zeroed();
    }

    let receiver = obj as *mut T as *mut Object;
    let msg_send_fn = objc_msg_lookup(receiver, sel);
    objc_try!({ A::invoke(msg_send_fn, receiver, sel, args) })
}

pub unsafe fn send_super_unverified<T, A, R>(obj: *const T, superclass: &Class, sel: Sel, args: A) -> Result<R, MessageError>
where
    T: Message,
    A: MessageArguments,
    R: Any,
{
    let receiver = obj as *mut T as *mut Object;
    let sup = Super { receiver, superclass };
    let msg_send_fn = objc_msg_lookup_super(&sup, sel);
    objc_try!({ A::invoke(msg_send_fn, receiver, sel, args) })
}