use quote::quote;
use synstructure::{decl_derive, AddBounds, Structure};
decl_derive!([Trace, attributes(unsafe_ignore_trace)] => derive_trace);
fn derive_trace(mut s: Structure<'_>) -> proc_macro2::TokenStream {
s.filter(|bi| {
!bi.ast()
.attrs
.iter()
.any(|attr| attr.path.is_ident("unsafe_ignore_trace"))
});
let trace_body = s.each(|bi| quote!(mark(#bi)));
s.add_bounds(AddBounds::Fields);
let trace_impl = s.unsafe_bound_impl(
quote!(::gc::Trace),
quote! {
#[inline] unsafe fn trace(&self) {
#[allow(dead_code)]
#[inline]
unsafe fn mark<T: ::gc::Trace + ?Sized>(it: &T) {
::gc::Trace::trace(it);
}
match *self { #trace_body }
}
#[inline] unsafe fn root(&self) {
#[allow(dead_code)]
#[inline]
unsafe fn mark<T: ::gc::Trace + ?Sized>(it: &T) {
::gc::Trace::root(it);
}
match *self { #trace_body }
}
#[inline] unsafe fn unroot(&self) {
#[allow(dead_code)]
#[inline]
unsafe fn mark<T: ::gc::Trace + ?Sized>(it: &T) {
::gc::Trace::unroot(it);
}
match *self { #trace_body }
}
#[inline] fn finalize_glue(&self) {
::gc::Finalize::finalize(self);
#[allow(dead_code)]
#[inline]
fn mark<T: ::gc::Trace + ?Sized>(it: &T) {
::gc::Trace::finalize_glue(it);
}
match *self { #trace_body }
}
},
);
let drop_impl = s.unbound_impl(
quote!(::std::ops::Drop),
quote! {
fn drop(&mut self) {
if ::gc::finalizer_safe() {
::gc::Finalize::finalize(self);
}
}
},
);
quote! {
#trace_impl
#drop_impl
}
}
decl_derive!([Finalize] => derive_finalize);
#[allow(clippy::needless_pass_by_value)]
fn derive_finalize(s: Structure<'_>) -> proc_macro2::TokenStream {
s.unbound_impl(quote!(::gc::Finalize), quote!())
}