X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-c-bindings;a=blobdiff_plain;f=c-bindings-gen%2Fsrc%2Fmain.rs;h=7e77810c361398f4f27a2cb0936ce66e2a4c8a77;hp=647f344bcefa5dba7ed4df54926157f69ffc951e;hb=0dcc7fcda393868ee8760fc48ac37f46b2cdf5eb;hpb=defa610aab6b181a88423c8a67cfd24bbea6e05e diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs index 647f344..7e77810 100644 --- a/c-bindings-gen/src/main.rs +++ b/c-bindings-gen/src/main.rs @@ -43,6 +43,14 @@ use crate::c_types::*; use alloc::{vec::Vec, boxed::Box}; "; + +/// str.rsplit_once but with an older MSRV +fn rsplit_once<'a>(inp: &'a str, pattern: &str) -> Option<(&'a str, &'a str)> { + let mut iter = inp.rsplitn(2, pattern); + let second_entry = iter.next().unwrap(); + Some((iter.next().unwrap(), second_entry)) +} + // ************************************* // *** Manually-expanded conversions *** // ************************************* @@ -54,11 +62,10 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path let full_obj_path; let mut has_inner = false; if let syn::Type::Path(ref p) = for_ty { - if let Some(ident) = single_ident_generic_path_to_ident(&p.path) { - for_obj = format!("{}", ident); - full_obj_path = for_obj.clone(); - has_inner = types.c_type_has_inner_from_path(&types.resolve_path(&p.path, Some(generics))); - } else { return; } + let resolved_path = types.resolve_path(&p.path, Some(generics)); + for_obj = format!("{}", p.path.segments.last().unwrap().ident); + full_obj_path = format!("crate::{}", resolved_path); + has_inner = types.c_type_has_inner_from_path(&resolved_path); } else { // We assume that anything that isn't a Path is somehow a generic that ends up in our // derived-types module. @@ -102,21 +109,44 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path let mut arg_conv = Vec::new(); if t == "lightning::util::ser::ReadableArgs" { - write!(w, ", arg: ").unwrap(); assert!(trait_path.leading_colon.is_none()); let args_seg = trait_path.segments.iter().last().unwrap(); assert_eq!(format!("{}", args_seg.ident), "ReadableArgs"); if let syn::PathArguments::AngleBracketed(args) = &args_seg.arguments { assert_eq!(args.args.len(), 1); if let syn::GenericArgument::Type(args_ty) = args.args.iter().next().unwrap() { - types.write_c_type(w, args_ty, Some(generics), false); + macro_rules! write_arg_conv { + ($ty: expr, $arg_name: expr) => { + write!(w, ", {}: ", $arg_name).unwrap(); + types.write_c_type(w, $ty, Some(generics), false); + + write!(&mut arg_conv, "\t").unwrap(); + if types.write_from_c_conversion_new_var(&mut arg_conv, &format_ident!("{}", $arg_name), &$ty, Some(generics)) { + write!(&mut arg_conv, "\n\t").unwrap(); + } - assert!(!types.write_from_c_conversion_new_var(&mut arg_conv, &format_ident!("arg"), &args_ty, Some(generics))); + write!(&mut arg_conv, "let {}_conv = ", $arg_name).unwrap(); + types.write_from_c_conversion_prefix(&mut arg_conv, &$ty, Some(generics)); + write!(&mut arg_conv, "{}", $arg_name).unwrap(); + types.write_from_c_conversion_suffix(&mut arg_conv, &$ty, Some(generics)); + write!(&mut arg_conv, ";\n").unwrap(); + } + } - write!(&mut arg_conv, "\tlet arg_conv = ").unwrap(); - types.write_from_c_conversion_prefix(&mut arg_conv, &args_ty, Some(generics)); - write!(&mut arg_conv, "arg").unwrap(); - types.write_from_c_conversion_suffix(&mut arg_conv, &args_ty, Some(generics)); + if let syn::Type::Tuple(tup) = args_ty { + // Crack open tuples and make them separate arguments instead of + // converting the full tuple. This makes it substantially easier to + // reason about things like references in the tuple fields. + let mut arg_conv_res = Vec::new(); + for (idx, elem) in tup.elems.iter().enumerate() { + let arg_name = format!("arg_{}", ('a' as u8 + idx as u8) as char); + write_arg_conv!(elem, arg_name); + write!(&mut arg_conv_res, "{}_conv{}", arg_name, if idx != tup.elems.len() - 1 { ", " } else { "" }).unwrap(); + } + writeln!(&mut arg_conv, "\tlet arg_conv = ({});", String::from_utf8(arg_conv_res).unwrap()).unwrap(); + } else { + write_arg_conv!(args_ty, "arg"); + } } else { unreachable!(); } } else { unreachable!(); } } else if t == "lightning::util::ser::MaybeReadable" { @@ -128,7 +158,6 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path if t == "lightning::util::ser::ReadableArgs" { w.write(&arg_conv).unwrap(); - write!(w, ";\n").unwrap(); } write!(w, "\tlet res: ").unwrap(); @@ -302,7 +331,6 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty ExportStatus::TestOnly => continue, ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), } - if m.default.is_some() { unimplemented!(); } let mut meth_gen_types = gen_types.push_ctx(); assert!(meth_gen_types.learn_generics(&m.sig.generics, types)); @@ -417,10 +445,9 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty match item { syn::TraitItem::Method(m) => { if let ExportStatus::TestOnly = export_status(&m.attrs) { continue; } - if m.default.is_some() { unimplemented!(); } if m.sig.constness.is_some() || m.sig.asyncness.is_some() || m.sig.unsafety.is_some() || m.sig.abi.is_some() || m.sig.variadic.is_some() { - unimplemented!(); + panic!("1"); } let mut meth_gen_types = gen_types.push_ctx(); assert!(meth_gen_types.learn_generics(&m.sig.generics, $type_resolver)); @@ -433,7 +460,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty for inp in m.sig.inputs.iter() { match inp { syn::FnArg::Receiver(recv) => { - if !recv.attrs.is_empty() || recv.reference.is_none() { unimplemented!(); } + if !recv.attrs.is_empty() || recv.reference.is_none() { panic!("2"); } write!(w, "&").unwrap(); if let Some(lft) = &recv.reference.as_ref().unwrap().1 { write!(w, "'{} ", lft.ident).unwrap(); @@ -445,16 +472,16 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty } }, syn::FnArg::Typed(arg) => { - if !arg.attrs.is_empty() { unimplemented!(); } + if !arg.attrs.is_empty() { panic!("3"); } match &*arg.pat { syn::Pat::Ident(ident) => { if !ident.attrs.is_empty() || ident.by_ref.is_some() || ident.mutability.is_some() || ident.subpat.is_some() { - unimplemented!(); + panic!("4"); } write!(w, ", mut {}{}: ", if $type_resolver.skip_arg(&*arg.ty, Some(&meth_gen_types)) { "_" } else { "" }, ident.ident).unwrap(); } - _ => unimplemented!(), + _ => panic!("5"), } $type_resolver.write_rust_type(w, Some(&gen_types), &*arg.ty); } @@ -471,7 +498,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty write!(w, " {{\n\t\t").unwrap(); match export_status(&m.attrs) { ExportStatus::NoExport => { - unimplemented!(); + panic!("6"); }, _ => {}, } @@ -497,14 +524,14 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty writeln!(w, "\n\t}}").unwrap(); }, &syn::TraitItem::Type(ref t) => { - if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); } + if t.default.is_some() || t.generics.lt_token.is_some() { panic!("10"); } let mut bounds_iter = t.bounds.iter(); loop { match bounds_iter.next().unwrap() { syn::TypeParamBound::Trait(tr) => { writeln!(w, "\ttype {} = crate::{};", t.ident, $type_resolver.resolve_path(&tr.path, Some(&gen_types))).unwrap(); for bound in bounds_iter { - if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); } + if let syn::TypeParamBound::Trait(_) = bound { panic!("11"); } } break; }, @@ -512,7 +539,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty } } }, - _ => unimplemented!(), + _ => panic!("12"), } } } @@ -850,8 +877,12 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } if let &syn::Type::Path(ref p) = &*i.self_ty { if p.qself.is_some() { unimplemented!(); } - if let Some(ident) = single_ident_generic_path_to_ident(&p.path) { - if let Some(resolved_path) = types.maybe_resolve_non_ignored_ident(&ident) { + let ident = &p.path.segments.last().unwrap().ident; + if let Some(resolved_path) = types.maybe_resolve_path(&p.path, None) { + if types.crate_types.opaques.contains_key(&resolved_path) || types.crate_types.mirrored_enums.contains_key(&resolved_path) || + // At least for core::infallible::Infallible we need to support mapping an + // out-of-crate trait implementation. + (types.understood_c_path(&p.path) && first_seg_is_stdlib(resolved_path.split("::").next().unwrap())) { if !types.understood_c_path(&p.path) { eprintln!("Not implementing anything for impl {} as the type is not understood (probably C-not exported)", ident); return; @@ -1017,7 +1048,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "\t}}\n}}\n").unwrap(); macro_rules! impl_meth { - ($m: expr, $trait_meth: expr, $trait_path: expr, $trait: expr, $indent: expr) => { + ($m: expr, $trait_meth: expr, $trait_path: expr, $trait: expr, $indent: expr, $types: expr) => { let trait_method = $trait.items.iter().filter_map(|item| { if let syn::TraitItem::Method(t_m) = item { Some(t_m) } else { None } }).find(|trait_meth| trait_meth.sig.ident == $m.sig.ident).unwrap(); @@ -1032,14 +1063,14 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } write!(w, "extern \"C\" fn {}_{}_{}(", ident, $trait.ident, $m.sig.ident).unwrap(); let mut meth_gen_types = gen_types.push_ctx(); - assert!(meth_gen_types.learn_generics(&$m.sig.generics, types)); + assert!(meth_gen_types.learn_generics(&$m.sig.generics, $types)); let mut uncallable_function = false; for inp in $m.sig.inputs.iter() { match inp { syn::FnArg::Typed(arg) => { - if types.skip_arg(&*arg.ty, Some(&meth_gen_types)) { continue; } + if $types.skip_arg(&*arg.ty, Some(&meth_gen_types)) { continue; } let mut c_type = Vec::new(); - types.write_c_type(&mut c_type, &*arg.ty, Some(&meth_gen_types), false); + $types.write_c_type(&mut c_type, &*arg.ty, Some(&meth_gen_types), false); if is_type_unconstructable(&String::from_utf8(c_type).unwrap()) { uncallable_function = true; } @@ -1048,16 +1079,16 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } } if uncallable_function { - let mut trait_resolver = get_module_type_resolver!(full_trait_path, types.crate_libs, types.crate_types); + let mut trait_resolver = get_module_type_resolver!(full_trait_path, $types.crate_libs, $types.crate_types); write_method_params(w, &$trait_meth.sig, "c_void", &mut trait_resolver, Some(&meth_gen_types), true, true); } else { - write_method_params(w, &$m.sig, "c_void", types, Some(&meth_gen_types), true, true); + write_method_params(w, &$m.sig, "c_void", $types, Some(&meth_gen_types), true, true); } write!(w, " {{\n\t").unwrap(); if uncallable_function { write!(w, "unreachable!();").unwrap(); } else { - write_method_var_decl_body(w, &$m.sig, "", types, Some(&meth_gen_types), false); + write_method_var_decl_body(w, &$m.sig, "", $types, Some(&meth_gen_types), false); let mut takes_self = false; for inp in $m.sig.inputs.iter() { if let syn::FnArg::Receiver(_) = inp { @@ -1087,7 +1118,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ }, _ => {}, } - write_method_call_params(w, &$m.sig, "", types, Some(&meth_gen_types), &real_type, false); + write_method_call_params(w, &$m.sig, "", $types, Some(&meth_gen_types), &real_type, false); } write!(w, "\n}}\n").unwrap(); if let syn::ReturnType::Type(_, rtype) = &$m.sig.output { @@ -1097,7 +1128,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "\t// This is a bit race-y in the general case, but for our specific use-cases today, we're safe").unwrap(); writeln!(w, "\t// Specifically, we must ensure that the first time we're called it can never be in parallel").unwrap(); write!(w, "\tif ").unwrap(); - types.write_empty_rust_val_check(Some(&meth_gen_types), w, &*r.elem, &format!("trait_self_arg.{}", $m.sig.ident)); + $types.write_empty_rust_val_check(Some(&meth_gen_types), w, &*r.elem, &format!("trait_self_arg.{}", $m.sig.ident)); writeln!(w, " {{").unwrap(); writeln!(w, "\t\tunsafe {{ &mut *(trait_self_arg as *const {} as *mut {}) }}.{} = {}_{}_{}(trait_self_arg.this_arg);", $trait.ident, $trait.ident, $m.sig.ident, ident, $trait.ident, $m.sig.ident).unwrap(); writeln!(w, "\t}}").unwrap(); @@ -1107,24 +1138,29 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } } - 'impl_item_loop: for item in i.items.iter() { - match item { - syn::ImplItem::Method(m) => { - for trait_item in trait_obj.items.iter() { - match trait_item { - syn::TraitItem::Method(meth) => { + 'impl_item_loop: for trait_item in trait_obj.items.iter() { + match trait_item { + syn::TraitItem::Method(meth) => { + for item in i.items.iter() { + match item { + syn::ImplItem::Method(m) => { if meth.sig.ident == m.sig.ident { - impl_meth!(m, meth, full_trait_path, trait_obj, ""); + impl_meth!(m, meth, full_trait_path, trait_obj, "", types); continue 'impl_item_loop; } }, - _ => {}, + syn::ImplItem::Type(_) => {}, + _ => unimplemented!(), } } - unreachable!(); + assert!(meth.default.is_some()); + let old_gen_types = gen_types; + gen_types = GenericTypes::new(Some(resolved_path.clone())); + let mut trait_resolver = get_module_type_resolver!(full_trait_path, types.crate_libs, types.crate_types); + impl_meth!(meth, meth, full_trait_path, trait_obj, "", &mut trait_resolver); + gen_types = old_gen_types; }, - syn::ImplItem::Type(_) => {}, - _ => unimplemented!(), + _ => {}, } } if requires_clone { @@ -1223,13 +1259,22 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "\torig.clone()").unwrap(); writeln!(w, "}}").unwrap(); } else if path_matches_nongeneric(&trait_path.1, &["FromStr"]) { - if let Some(container) = types.get_c_mangled_container_type( - vec![&*i.self_ty, &syn::Type::Tuple(syn::TypeTuple { paren_token: Default::default(), elems: syn::punctuated::Punctuated::new() })], - Some(&gen_types), "Result") { + let mut err_opt = None; + for item in i.items.iter() { + match item { + syn::ImplItem::Type(ty) if format!("{}", ty.ident) == "Err" => { + err_opt = Some(&ty.ty); + }, + _ => {} + } + } + let err_ty = err_opt.unwrap(); + if let Some(container) = types.get_c_mangled_container_type(vec![&*i.self_ty, &err_ty], Some(&gen_types), "Result") { writeln!(w, "#[no_mangle]").unwrap(); writeln!(w, "/// Read a {} object from a string", ident).unwrap(); writeln!(w, "pub extern \"C\" fn {}_from_str(s: crate::c_types::Str) -> {} {{", ident, container).unwrap(); writeln!(w, "\tmatch {}::from_str(s.into_str()) {{", resolved_path).unwrap(); + writeln!(w, "\t\tOk(r) => {{").unwrap(); 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(); @@ -1237,7 +1282,15 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ write!(w, "{}r", if new_var { "local_" } else { "" }).unwrap(); types.write_to_c_conversion_inline_suffix(w, &*i.self_ty, Some(&gen_types), false); writeln!(w, "\n\t\t\t)\n\t\t}},").unwrap(); - writeln!(w, "\t\tErr(e) => crate::c_types::CResultTempl::err(()),").unwrap(); + + writeln!(w, "\t\tErr(e) => {{").unwrap(); + let new_var = types.write_to_c_conversion_new_var(w, &format_ident!("e"), &err_ty, Some(&gen_types), false); + write!(w, "\t\t\tcrate::c_types::CResultTempl::err(\n\t\t\t\t").unwrap(); + types.write_to_c_conversion_inline_prefix(w, &err_ty, Some(&gen_types), false); + write!(w, "{}e", if new_var { "local_" } else { "" }).unwrap(); + types.write_to_c_conversion_inline_suffix(w, &err_ty, Some(&gen_types), false); + writeln!(w, "\n\t\t\t)\n\t\t}},").unwrap(); + writeln!(w, "\t}}.into()\n}}").unwrap(); } } else if path_matches_nongeneric(&trait_path.1, &["Display"]) { @@ -1261,7 +1314,8 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ maybe_convert_trait_impl(w, &trait_path.1, &*i.self_ty, types, &gen_types); } } else { - let declared_type = (*types.get_declared_type(&ident).unwrap()).clone(); + let is_opaque = types.crate_types.opaques.contains_key(&resolved_path); + let is_mirrored_enum = types.crate_types.mirrored_enums.contains_key(&resolved_path); for item in i.items.iter() { match item { syn::ImplItem::Method(m) => { @@ -1279,11 +1333,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "#[must_use]").unwrap(); } write!(w, "#[no_mangle]\npub extern \"C\" fn {}_{}(", ident, m.sig.ident).unwrap(); - let ret_type = match &declared_type { - DeclType::MirroredEnum => format!("{}", ident), - DeclType::StructImported {..} => format!("{}", ident), - _ => unimplemented!(), - }; + let ret_type = format!("crate::{}", resolved_path); write_method_params(w, &m.sig, &ret_type, types, Some(&meth_gen_types), false, true); write!(w, " {{\n\t").unwrap(); write_method_var_decl_body(w, &m.sig, "", types, Some(&meth_gen_types), false); @@ -1300,18 +1350,18 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ if !takes_mut_self && !takes_self { write!(w, "{}::{}(", resolved_path, m.sig.ident).unwrap(); } else { - match &declared_type { - DeclType::MirroredEnum => write!(w, "this_arg.to_native().{}(", m.sig.ident).unwrap(), - DeclType::StructImported {..} => { - if takes_owned_self { - write!(w, "(*unsafe {{ Box::from_raw(this_arg.take_inner()) }}).{}(", m.sig.ident).unwrap(); - } else if takes_mut_self { - write!(w, "unsafe {{ &mut (*ObjOps::untweak_ptr(this_arg.inner as *mut native{})) }}.{}(", ident, m.sig.ident).unwrap(); - } else { - write!(w, "unsafe {{ &*ObjOps::untweak_ptr(this_arg.inner) }}.{}(", m.sig.ident).unwrap(); - } - }, - _ => unimplemented!(), + if is_mirrored_enum { + write!(w, "this_arg.to_native().{}(", m.sig.ident).unwrap(); + } else if is_opaque { + if takes_owned_self { + write!(w, "(*unsafe {{ Box::from_raw(this_arg.take_inner()) }}).{}(", m.sig.ident).unwrap(); + } else if takes_mut_self { + write!(w, "unsafe {{ &mut (*ObjOps::untweak_ptr(this_arg.inner as *mut crate::{}::native{})) }}.{}(", rsplit_once(&resolved_path, "::").unwrap().0, ident, m.sig.ident).unwrap(); + } else { + write!(w, "unsafe {{ &*ObjOps::untweak_ptr(this_arg.inner) }}.{}(", m.sig.ident).unwrap(); + } + } else { + unimplemented!(); } } write_method_call_params(w, &m.sig, "", types, Some(&meth_gen_types), &ret_type, false); @@ -1324,8 +1374,22 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } } else if let Some(resolved_path) = types.maybe_resolve_ident(&ident) { if let Some(aliases) = types.crate_types.reverse_alias_map.get(&resolved_path).cloned() { - 'alias_impls: for (alias, arguments) in aliases { - let alias_resolved = types.resolve_path(&alias, None); + let mut gen_types = Some(GenericTypes::new(Some(resolved_path.clone()))); + if !gen_types.as_mut().unwrap().learn_generics(&i.generics, types) { + gen_types = None; + } + let alias_module = rsplit_once(&resolved_path, "::").unwrap().0; + + 'alias_impls: for (alias_resolved, arguments) in aliases { + let mut new_ty_generics = Vec::new(); + let mut need_generics = false; + + let alias_resolver_override; + let alias_resolver = if alias_module != types.module_path { + alias_resolver_override = ImportResolver::new(types.types.crate_name, &types.crate_types.lib_ast.dependencies, + alias_module, &types.crate_types.lib_ast.modules.get(alias_module).unwrap().items); + &alias_resolver_override + } else { &types.types };/*.maybe_resolve_path(&alias, None).unwrap();*/ for (idx, gen) in i.generics.params.iter().enumerate() { match gen { syn::GenericParam::Type(type_param) => { @@ -1334,17 +1398,27 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ if let syn::PathArguments::AngleBracketed(ref t) = &arguments { assert!(idx < t.args.len()); if let syn::GenericArgument::Type(syn::Type::Path(p)) = &t.args[idx] { - let generic_arg = types.resolve_path(&p.path, None); - let generic_bound = types.resolve_path(&trait_bound.path, None); - if let Some(traits_impld) = types.crate_types.trait_impls.get(&generic_arg) { - for trait_impld in traits_impld { - if *trait_impld == generic_bound { continue 'bounds_check; } + if let Some(generic_arg) = alias_resolver.maybe_resolve_path(&p.path, None) { + + new_ty_generics.push((type_param.ident.clone(), syn::Type::Path(p.clone()))); + let generic_bound = types.maybe_resolve_path(&trait_bound.path, None) + .unwrap_or_else(|| format!("{}::{}", types.module_path, single_ident_generic_path_to_ident(&trait_bound.path).unwrap())); + if let Some(traits_impld) = types.crate_types.trait_impls.get(&generic_arg) { + for trait_impld in traits_impld { + if *trait_impld == generic_bound { continue 'bounds_check; } + } + eprintln!("struct {}'s generic arg {} didn't match bound {}", alias_resolved, generic_arg, generic_bound); + continue 'alias_impls; + } else { + eprintln!("struct {}'s generic arg {} didn't match bound {}", alias_resolved, generic_arg, generic_bound); + continue 'alias_impls; } - eprintln!("struct {}'s generic arg {} didn't match bound {}", alias_resolved, generic_arg, generic_bound); - continue 'alias_impls; + } else if gen_types.is_some() { + new_ty_generics.push((type_param.ident.clone(), + gen_types.as_ref().resolve_type(&syn::Type::Path(p.clone())).clone())); + need_generics = true; } else { - eprintln!("struct {}'s generic arg {} didn't match bound {}", alias_resolved, generic_arg, generic_bound); - continue 'alias_impls; + unimplemented!(); } } else { unimplemented!(); } } else { unimplemented!(); } @@ -1355,19 +1429,55 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ syn::GenericParam::Const(_) => unimplemented!(), } } + let mut params = syn::punctuated::Punctuated::new(); + let alias = string_path_to_syn_path(&alias_resolved); + let real_aliased = + if need_generics { + let alias_generics = types.crate_types.opaques.get(&alias_resolved).unwrap().1; + + // If we need generics on the alias, create impl generic bounds... + assert_eq!(new_ty_generics.len(), i.generics.params.len()); + let mut args = syn::punctuated::Punctuated::new(); + for (ident, param) in new_ty_generics.drain(..) { + // TODO: We blindly assume that generics in the type alias and + // the aliased type have the same names, which we really shouldn't. + if alias_generics.params.iter().any(|generic| + if let syn::GenericParam::Type(t) = generic { t.ident == ident } else { false }) + { + args.push(parse_quote!(#ident)); + } + params.push(syn::GenericParam::Type(syn::TypeParam { + attrs: Vec::new(), + ident, + colon_token: None, + bounds: syn::punctuated::Punctuated::new(), + eq_token: Some(syn::token::Eq(Span::call_site())), + default: Some(param), + })); + } + // ... and swap the last segment of the impl self_ty to use the generic bounds. + let mut res = alias.clone(); + res.segments.last_mut().unwrap().arguments = syn::PathArguments::AngleBracketed(syn::AngleBracketedGenericArguments { + colon2_token: None, + lt_token: syn::token::Lt(Span::call_site()), + args, + gt_token: syn::token::Gt(Span::call_site()), + }); + res + } else { alias.clone() }; let aliased_impl = syn::ItemImpl { attrs: i.attrs.clone(), brace_token: syn::token::Brace(Span::call_site()), defaultness: None, generics: syn::Generics { lt_token: None, - params: syn::punctuated::Punctuated::new(), + params, gt_token: None, where_clause: None, }, impl_token: syn::Token![impl](Span::call_site()), items: i.items.clone(), - self_ty: Box::new(syn::Type::Path(syn::TypePath { qself: None, path: alias.clone() })), + self_ty: Box::new(syn::Type::Path(syn::TypePath { qself: None, path: real_aliased })), trait_: i.trait_.clone(), unsafety: None, }; @@ -1686,11 +1796,7 @@ fn convert_priv_mod<'a, 'b: 'a, W: std::io::Write>(w: &mut W, libast: &'b FullLi match item { syn::Item::Mod(m) => convert_priv_mod(w, libast, crate_types, out_dir, &format!("{}::{}", mod_path, module.ident), m), syn::Item::Impl(i) => { - if let &syn::Type::Path(ref p) = &*i.self_ty { - if p.path.get_ident().is_some() { - writeln_impl(w, i, &mut types); - } - } + writeln_impl(w, i, &mut types); }, _ => {}, } @@ -1812,17 +1918,38 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), } - let mut process_alias = true; - for tok in t.generics.params.iter() { - if let syn::GenericParam::Lifetime(_) = tok {} - else { process_alias = false; } - } - if process_alias { - match &*t.ty { - syn::Type::Path(_) => - writeln_opaque(&mut out, &t.ident, &format!("{}", t.ident), &t.generics, &t.attrs, &type_resolver, header_file, cpp_header_file), - _ => {} - } + match &*t.ty { + syn::Type::Path(p) => { + let real_ty = type_resolver.resolve_path(&p.path, None); + let real_generic_bounds = type_resolver.crate_types.opaques.get(&real_ty).map(|t| t.1).or( + type_resolver.crate_types.priv_structs.get(&real_ty).map(|r| *r)).unwrap(); + let mut resolved_generics = t.generics.clone(); + + // Assume blindly that the bounds in the struct definition where + // clause matches any equivalent bounds on the type alias. + assert!(resolved_generics.where_clause.is_none()); + resolved_generics.where_clause = real_generic_bounds.where_clause.clone(); + + if let syn::PathArguments::AngleBracketed(real_generics) = &p.path.segments.last().unwrap().arguments { + for (real_idx, real_param) in real_generics.args.iter().enumerate() { + if let syn::GenericArgument::Type(syn::Type::Path(real_param_path)) = real_param { + for param in resolved_generics.params.iter_mut() { + if let syn::GenericParam::Type(type_param) = param { + if Some(&type_param.ident) == real_param_path.path.get_ident() { + if let syn::GenericParam::Type(real_type_param) = &real_generic_bounds.params[real_idx] { + type_param.bounds = real_type_param.bounds.clone(); + type_param.default = real_type_param.default.clone(); + + } + } + } + } + } + } + } + + writeln_opaque(&mut out, &t.ident, &format!("{}", t.ident), &resolved_generics, &t.attrs, &type_resolver, header_file, cpp_header_file)}, + _ => {} } } }, @@ -1878,12 +2005,15 @@ fn walk_ast<'a>(ast_storage: &'a FullLibraryAST, crate_types: &mut CrateTypes<'a match item { syn::Item::Struct(s) => { if let syn::Visibility::Public(_) = s.vis { + let struct_path = format!("{}::{}", module, s.ident); match export_status(&s.attrs) { ExportStatus::Export => {}, - ExportStatus::NoExport|ExportStatus::TestOnly => continue, + ExportStatus::NoExport|ExportStatus::TestOnly => { + crate_types.priv_structs.insert(struct_path, &s.generics); + continue + }, ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), } - let struct_path = format!("{}::{}", module, s.ident); crate_types.opaques.insert(struct_path, (&s.ident, &s.generics)); } }, @@ -1911,29 +2041,19 @@ fn walk_ast<'a>(ast_storage: &'a FullLibraryAST, crate_types: &mut CrateTypes<'a ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), } let type_path = format!("{}::{}", module, t.ident); - let mut process_alias = true; - for tok in t.generics.params.iter() { - if let syn::GenericParam::Lifetime(_) = tok {} - else { process_alias = false; } - } - if process_alias { - match &*t.ty { - syn::Type::Path(p) => { - let t_ident = &t.ident; - - // If its a path with no generics, assume we don't map the aliased type and map it opaque - let path_obj = parse_quote!(#t_ident); - let args_obj = p.path.segments.last().unwrap().arguments.clone(); - match crate_types.reverse_alias_map.entry(import_resolver.maybe_resolve_path(&p.path, None).unwrap()) { - hash_map::Entry::Occupied(mut e) => { e.get_mut().push((path_obj, args_obj)); }, - hash_map::Entry::Vacant(e) => { e.insert(vec![(path_obj, args_obj)]); }, - } - - crate_types.opaques.insert(type_path, (t_ident, &t.generics)); - }, - _ => { - crate_types.type_aliases.insert(type_path, import_resolver.resolve_imported_refs((*t.ty).clone())); + match &*t.ty { + syn::Type::Path(p) => { + // If its a path with no generics, assume we don't map the aliased type and map it opaque + let args_obj = p.path.segments.last().unwrap().arguments.clone(); + match crate_types.reverse_alias_map.entry(import_resolver.maybe_resolve_path(&p.path, None).unwrap()) { + hash_map::Entry::Occupied(mut e) => { e.get_mut().push((type_path.clone(), args_obj)); }, + hash_map::Entry::Vacant(e) => { e.insert(vec![(type_path.clone(), args_obj)]); }, } + + crate_types.opaques.insert(type_path, (&t.ident, &t.generics)); + }, + _ => { + crate_types.type_aliases.insert(type_path, import_resolver.resolve_imported_refs((*t.ty).clone())); } } }