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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/// Defines a macro `native_fn!` to create a JavaScript function from a Rust function pointer.
/// # Example
/// ```
/// let js_function: Rc<Function> = native_fn!(my_rust_function, c"myFunction", 2, 0);
/// ```
#[macro_export]
macro_rules! native_fn {
($cx:expr, $call:expr, $name:expr, $nargs:expr, $flags:expr) => {{
let fun_obj = $crate::native_raw_obj_fn!($cx, $call, $name, $nargs, $flags);
let cx = $cx.into();
#[expect(unsafe_code)]
unsafe {
Function::new(cx, fun_obj)
}
}};
}
/// Defines a macro `native_raw_obj_fn!` to create a raw JavaScript function object.
/// # Example
/// ```
/// let raw_function_obj: *mut JSObject = native_raw_obj_fn!(cx, my_rust_function, c"myFunction", 2, 0);
/// ```
#[macro_export]
macro_rules! native_raw_obj_fn {
($cx:expr, $call:expr, $name:expr, $nargs:expr, $flags:expr) => {{
#[expect(unsafe_code)]
#[allow(clippy::macro_metavars_in_unsafe)]
unsafe extern "C" fn wrapper(cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
let mut cx = unsafe {
// SAFETY: We are in SM hook
js::context::JSContext::from_ptr(
std::ptr::NonNull::new(cx).expect("JSContext is not null in SM hook"),
)
};
let call_args = unsafe { CallArgs::from_vp(vp, argc) };
$call(&mut cx, call_args)
}
#[expect(unsafe_code)]
#[allow(clippy::macro_metavars_in_unsafe)]
unsafe {
let name: &std::ffi::CStr = $name;
let raw_fun = js::jsapi::JS_NewFunction(
$cx.raw_cx(),
Some(wrapper),
$nargs,
$flags,
name.as_ptr() as *const std::ffi::c_char,
);
assert!(!raw_fun.is_null());
js::jsapi::JS_GetFunctionObject(raw_fun)
}
}};
}