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//! Callbacks from C to OCaml
//! This is also where you initialize the OCaml runtime system via `caml_startup` or `caml_main`
//!

use core::mlvalues::Value;

extern "C" {
    pub fn caml_callback(closure: Value, arg: Value) -> Value;
    pub fn caml_callback2(closure: Value, arg1: Value, arg2: Value) -> Value;
    pub fn caml_callback3(closure: Value, arg1: Value, arg2: Value, arg3: Value) -> Value;
    pub fn caml_callbackN(closure: Value, narg: usize, args: *mut Value) -> Value;

    pub fn caml_callback_exn(closure: Value, arg1: Value) -> Value;
    pub fn caml_callback2_exn(closure: Value, arg1: Value, arg2: Value) -> Value;
    pub fn caml_callback3_exn(closure: Value, arg1: Value, arg2: Value, arg3: Value) -> Value;
    pub fn caml_callbackN_exn(closure: Value, narg: usize, args: *mut Value) -> Value;

    pub fn caml_main(argv: *mut *mut u8);
    pub fn caml_startup(argv: *mut *mut u8);
    pub fn caml_named_value(name: *const u8) -> *mut Value;

    pub static mut caml_callback_depth: usize;
}

macro_rules! is_exception_result {
    ($v:expr) => {
        ($v as usize) & 3 == 2
    };
}

macro_rules! extract_exception {
    ($v:expr) => {
        ($v as usize) & !3
    };
}