Add alias kind to syntax::TypeAlias

Author: sbrocket

macro/src/expand.rs

@@ -4,7 +4,8 @@ use crate::syntax::namespace::Namespace;
 use crate::syntax::report::Errors;
 use crate::syntax::symbol::Symbol;
 use crate::syntax::{
-    self, check, mangle, Api, Enum, ExternFn, ExternType, Signature, Struct, Type, TypeAlias, Types,
+    self, check, mangle, AliasKind, Api, Enum, ExternFn, ExternType, Signature, Struct, Type,
+    TypeAlias, Types,
 };
 use proc_macro2::{Ident, TokenStream};
 use quote::{format_ident, quote, quote_spanned, ToTokens};
@@ -672,11 +673,15 @@ fn expand_type_alias_verify(namespace: &Namespace, alias: &TypeAlias) -> TokenSt
     let type_id = type_id(namespace, ident);
     let begin_span = alias.type_token.span;
     let end_span = alias.semi_token.span;
+    let kind = match alias.kind {
+        AliasKind::Shared => quote!(KindShared),
+        AliasKind::OpaqueCpp => quote!(KindOpaqueCpp),
+    };
     let begin = quote_spanned!(begin_span=> ::cxx::private::verify_extern_type::<);
     let end = quote_spanned!(end_span=> >);
 
     quote! {
-        const _: fn() = #begin #ident, ::cxx::extern_type::KindOpaqueCpp, #type_id #end;
+        const _: fn() = #begin #ident, ::cxx::extern_type:: #kind, #type_id #end;
     }
 }
 

syntax/mod.rs

@@ -78,7 +78,13 @@ pub struct ExternFn {
     pub semi_token: Token![;],
 }
 
+pub enum AliasKind {
+    Shared,
+    OpaqueCpp,
+}
+
 pub struct TypeAlias {
+    pub kind: AliasKind,
     pub doc: Doc,
     pub type_token: Token![type],
     pub ident: Ident,

syntax/parse.rs

@@ -3,8 +3,8 @@ use crate::syntax::file::{Item, ItemForeignMod};
 use crate::syntax::report::Errors;
 use crate::syntax::Atom::*;
 use crate::syntax::{
-    attrs, error, Api, Doc, Enum, ExternFn, ExternType, Lang, Receiver, Ref, Signature, Slice,
-    Struct, Ty1, Type, TypeAlias, Var, Variant,
+    attrs, error, AliasKind, Api, Doc, Enum, ExternFn, ExternType, Lang, Receiver, Ref, Signature,
+    Slice, Struct, Ty1, Type, TypeAlias, Var, Variant,
 };
 use proc_macro2::{TokenStream, TokenTree};
 use quote::{format_ident, quote, quote_spanned};
@@ -399,6 +399,7 @@ fn parse_extern_verbatim(cx: &mut Errors, tokens: &TokenStream, lang: Lang) -> R
         let doc = attrs::parse_doc(cx, &attrs);
 
         Ok(TypeAlias {
+            kind: AliasKind::OpaqueCpp,
             doc,
             type_token,
             ident,