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Use mozjs tracing infrastructure (#29918)

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* Update mozjs

64711ec2e6 also fixes https://github.com/servo/servo/issues/30043

* Move to mozjs Traceable and introduce CustomTraceable
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Samson 2023-08-10 23:46:06 +02:00 • committed by GitHub
parent 1f7f4cf2be
commit 450f8193a5
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GPG key ID: 4AEE18F83AFDEB23
20 changed files with 81 additions and 377 deletions
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11
components/jstraceable_derive/lib.rs
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@ -7,7 +7,7 @@ extern crate syn;
#[macro_use]
extern crate synstructure;
decl_derive!([JSTraceable, attributes(no_trace)] =>
decl_derive!([JSTraceable, attributes(no_trace, custom_trace)] =>
/// Implements `JSTraceable` on structs and enums
///
/// Example:
@ -17,6 +17,8 @@ decl_derive!([JSTraceable, attributes(no_trace)] =>
/// js_managed: JSManagedType,
/// #[no_trace]
/// non_js: NonJSManagedType,
/// #[custom_trace] // Extern type implements CustomTraceable that is in servo => no problem with orphan rules
/// extern_managed_type: Extern<JSManagedType>,
/// }
/// ```
///
@ -30,6 +32,7 @@ decl_derive!([JSTraceable, attributes(no_trace)] =>
/// S {
/// js_managed: ref __binding_0,
/// non_js: ref __binding_1,
/// extern_managed_type: ref __binding_2,
/// } => {
/// {
/// __binding_0.trace(tracer);
@ -37,6 +40,9 @@ decl_derive!([JSTraceable, attributes(no_trace)] =>
/// {
/// // __binding_1 is not traceable so we do not need to trace it
/// }
/// {
/// <crate::dom::bindings::trace::CustomTraceable>::trace(__binding_2, tracer);
/// }
/// },
/// }
/// }
@ -150,9 +156,12 @@ fn js_traceable_derive(s: synstructure::Structure) -> proc_macro2::TokenStream {
if path.is_ident("no_trace") {
asserts.extend(assert_not_impl_traceable(&binding.ast().ty));
return None;
} else if path.is_ident("custom_trace") {
return Some(quote!(<crate::dom::bindings::trace::CustomTraceable>::trace(#binding, tracer);));
}
},
syn::Meta::NameValue(syn::MetaNameValue { ref path, .. }) => {
// if reason provided we can skip JSTraceable check
if path.is_ident("no_trace") {
return None;
}