Generate mutable references in `default_generics` when relevant

[ldk-c-bindings] / c-bindings-gen / src / types.rs

diff --git a/c-bindings-gen/src/types.rs b/c-bindings-gen/src/types.rs
index 2ea9221a63f6a6a22a76c01b93e9a0d29ae92db3..8f5e66735d5df40784fef02306ed95d2ec27cb14 100644 (file)
--- a/c-bindings-gen/src/types.rs
+++ b/c-bindings-gen/src/types.rs
@@ -190,7 +190,7 @@ pub struct GenericTypes<'a, 'b> {
        self_ty: Option<String>,
        parent: Option<&'b GenericTypes<'b, 'b>>,
        typed_generics: HashMap<&'a syn::Ident, String>,
-       default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type)>,
+       default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type, syn::Type)>,
 }
 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
        pub fn new(self_ty: Option<String>) -> Self {
@@ -226,20 +226,25 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
                                                                if non_lifetimes_processed { return false; }
                                                                non_lifetimes_processed = true;
                                                                if path != "std::ops::Deref" && path != "core::ops::Deref" {
+                                                                       let p = string_path_to_syn_path(&path);
+                                                                       let ref_ty = parse_quote!(&#p);
+                                                                       let mut_ref_ty = parse_quote!(&mut #p);
+                                                                       self.default_generics.insert(&type_param.ident, (syn::Type::Path(syn::TypePath { qself: None, path: p }), ref_ty, mut_ref_ty));
                                                                        new_typed_generics.insert(&type_param.ident, Some(path));
-                                                               } else if trait_bound.path.segments.len() == 1 {
+                                                               } else {
                                                                        // If we're templated on Deref<Target = ConcreteThing>, store
                                                                        // the reference type in `default_generics` which handles full
                                                                        // types and not just paths.
                                                                        if let syn::PathArguments::AngleBracketed(ref args) =
                                                                                        trait_bound.path.segments[0].arguments {
+                                                                               assert_eq!(trait_bound.path.segments.len(), 1);
                                                                                for subargument in args.args.iter() {
                                                                                        match subargument {
                                                                                                syn::GenericArgument::Lifetime(_) => {},
                                                                                                syn::GenericArgument::Binding(ref b) => {
                                                                                                        if &format!("{}", b.ident) != "Target" { return false; }
                                                                                                        let default = &b.ty;
-                                                                                                       self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default)));
+                                                                                                       self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default), parse_quote!(&mut #default)));
                                                                                                        break 'bound_loop;
                                                                                                },
                                                                                                _ => unimplemented!(),
@@ -254,7 +259,7 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
                                        }
                                        if let Some(default) = type_param.default.as_ref() {
                                                assert!(type_param.bounds.is_empty());
-                                               self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default)));
+                                               self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default), parse_quote!(&mut #default)));
                                        }
                                },
                                _ => {},
@@ -283,14 +288,17 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
                                                                        non_lifetimes_processed = true;
                                                                        assert_simple_bound(&trait_bound);
                                                                        let resolved = types.resolve_path(&trait_bound.path, None);
-                                                                       let ref_ty = syn::Type::Reference(syn::TypeReference {
-                                                                               and_token: syn::Token![&](Span::call_site()),
-                                                                               lifetime: None, mutability: None,
-                                                                               elem: Box::new(syn::Type::Path(syn::TypePath {
-                                                                                       qself: None, path: string_path_to_syn_path(&resolved)
-                                                                               })),
+                                                                       let ty = syn::Type::Path(syn::TypePath {
+                                                                               qself: None, path: string_path_to_syn_path(&resolved)
                                                                        });
-                                                                       self.default_generics.insert(p_ident, (ref_ty.clone(), ref_ty));
+                                                                       let ref_ty = parse_quote!(&#ty);
+                                                                       let mut_ref_ty = parse_quote!(&mut #ty);
+                                                                       if types.crate_types.traits.get(&resolved).is_some() {
+                                                                               self.default_generics.insert(p_ident, (ty, ref_ty, mut_ref_ty));
+                                                                       } else {
+                                                                               self.default_generics.insert(p_ident, (ref_ty.clone(), ref_ty, mut_ref_ty));
+                                                                       }
+
                                                                        *gen = Some(resolved);
                                                                }
                                                        }
@@ -380,16 +388,20 @@ impl<'a, 'b, 'c: 'a + 'b> ResolveType<'c> for Option<&GenericTypes<'a, 'b>> {
                        match ty {
                                syn::Type::Path(p) => {
                                        if let Some(ident) = p.path.get_ident() {
-                                               if let Some((ty, _)) = us.default_generics.get(ident) {
-                                                       return ty;
+                                               if let Some((ty, _, _)) = us.default_generics.get(ident) {
+                                                       return self.resolve_type(ty);
                                                }
                                        }
                                },
-                               syn::Type::Reference(syn::TypeReference { elem, .. }) => {
+                               syn::Type::Reference(syn::TypeReference { elem, mutability, .. }) => {
                                        if let syn::Type::Path(p) = &**elem {
                                                if let Some(ident) = p.path.get_ident() {
-                                                       if let Some((_, refty)) = us.default_generics.get(ident) {
-                                                               return refty;
+                                                       if let Some((_, refty, mut_ref_ty)) = us.default_generics.get(ident) {
+                                                               if mutability.is_some() {
+                                                                       return self.resolve_type(mut_ref_ty);
+                                                               } else {
+                                                                       return self.resolve_type(refty);
+                                                               }
                                                        }
                                                }
                                        }