Correct handling of Display trait conversion

Previously we were incorrectly taking the *Rust* objects as
parameters in C functions instead of the C-mapped ones.

diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs
index 24bcf82f4369ca3d21403ec77bfcc753b92dc925..918a05a935e0c117d93f3dddfcb92365a178a78a 100644 (file)
--- a/c-bindings-gen/src/main.rs
+++ b/c-bindings-gen/src/main.rs
@@ -968,7 +968,7 @@ fn writeln_impl<W: std::io::Write>(w: &mut W, i: &syn::ItemImpl, types: &mut Typ
                                                        writeln!(w, "pub extern \"C\" fn {}_from_str(s: crate::c_types::Str) -> {} {{", ident, container).unwrap();
                                                        writeln!(w, "\tmatch {}::from_str(s.into()) {{", resolved_path).unwrap();
                                                        writeln!(w, "\t\tOk(r) => {{").unwrap();
-                                                       let new_var = types.write_to_c_conversion_new_var(w, &syn::Ident::new("r", Span::call_site()), &*i.self_ty, Some(&gen_types), false);
+                                                       let new_var = types.write_to_c_conversion_new_var(w, &format_ident!("r"), &*i.self_ty, Some(&gen_types), false);
                                                        write!(w, "\t\t\tcrate::c_types::CResultTempl::ok(\n\t\t\t\t").unwrap();
                                                        types.write_to_c_conversion_inline_prefix(w, &*i.self_ty, Some(&gen_types), false);
                                                        write!(w, "{}r", if new_var { "local_" } else { "" }).unwrap();
@@ -980,8 +980,17 @@ fn writeln_impl<W: std::io::Write>(w: &mut W, i: &syn::ItemImpl, types: &mut Typ
                                        } else if path_matches_nongeneric(&trait_path.1, &["Display"]) {
                                                writeln!(w, "#[no_mangle]").unwrap();
                                                writeln!(w, "/// Get the string representation of a {} object", ident).unwrap();
-                                               writeln!(w, "pub extern \"C\" fn {}_to_str(o: &{}) -> Str {{", ident, resolved_path).unwrap();
-                                               writeln!(w, "\tformat!(\"{{}}\", o).into()").unwrap();
+                                               writeln!(w, "pub extern \"C\" fn {}_to_str(o: &crate::{}) -> Str {{", ident, resolved_path).unwrap();
+
+                                               let self_ty = &i.self_ty;
+                                               let ref_type: syn::Type = syn::parse_quote!(&#self_ty);
+                                               let new_var = types.write_from_c_conversion_new_var(w, &format_ident!("o"), &ref_type, Some(&gen_types));
+                                               write!(w, "\tformat!(\"{{}}\", ").unwrap();
+                                               types.write_from_c_conversion_prefix(w, &ref_type, Some(&gen_types));
+                                               write!(w, "{}o", if new_var { "local_" } else { "" }).unwrap();
+                                               types.write_from_c_conversion_suffix(w, &ref_type, Some(&gen_types));
+                                               writeln!(w, ").into()").unwrap();
+
                                                writeln!(w, "}}").unwrap();
                                        } else {
                                                //XXX: implement for other things like ToString