X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=c-bindings-gen%2Fsrc%2Fmain.rs;h=ee800dbcf49c0049a70cf9d7451ec9795a43165d;hb=9c9d5baa90383947f6e3ea494a038c840cb6a1c0;hp=37b64a8574b06f77d1dc7333d69db2c7bc1e23c1;hpb=ec26d1215dc7bb40253edd64d2f5709448bdbad2;p=ldk-c-bindings diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs index 37b64a8..ee800db 100644 --- a/c-bindings-gen/src/main.rs +++ b/c-bindings-gen/src/main.rs @@ -18,10 +18,11 @@ //! It also generates relevant memory-management functions and free-standing functions with //! parameters mapped. -use std::collections::{HashMap, hash_map}; +use std::collections::{HashMap, hash_map, HashSet}; use std::env; use std::fs::File; use std::io::{Read, Write}; +use std::iter::FromIterator; use std::process; use proc_macro2::Span; @@ -101,7 +102,7 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path }, "lightning::util::ser::Readable"|"lightning::util::ser::ReadableArgs"|"lightning::util::ser::MaybeReadable" => { // Create the Result syn::Type - let mut res_ty: syn::Type = parse_quote!(Result<#for_ty, ::ln::msgs::DecodeError>); + let mut res_ty: syn::Type = parse_quote!(Result<#for_ty, lightning::ln::msgs::DecodeError>); writeln!(w, "#[no_mangle]").unwrap(); writeln!(w, "/// Read a {} from a byte array, created by {}_write", for_obj, for_obj).unwrap(); @@ -150,7 +151,7 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path } else { unreachable!(); } } else { unreachable!(); } } else if t == "lightning::util::ser::MaybeReadable" { - res_ty = parse_quote!(Result, ::ln::msgs::DecodeError>); + res_ty = parse_quote!(Result, lightning::ln::msgs::DecodeError>); } write!(w, ") -> ").unwrap(); types.write_c_type(w, &res_ty, Some(generics), false); @@ -162,7 +163,7 @@ fn maybe_convert_trait_impl(w: &mut W, trait_path: &syn::Path write!(w, "\tlet res: ").unwrap(); // At least in one case we need type annotations here, so provide them. - types.write_rust_type(w, Some(generics), &res_ty); + types.write_rust_type(w, Some(generics), &res_ty, false); if t == "lightning::util::ser::ReadableArgs" { writeln!(w, " = crate::c_types::deserialize_obj_arg(ser, arg_conv);").unwrap(); @@ -243,14 +244,15 @@ macro_rules! walk_supertraits { ($t: expr, $types: expr, ($( $($pat: pat)|* => $ let types_opt: Option<&TypeResolver> = $types; if let Some(types) = types_opt { if let Some(path) = types.maybe_resolve_path(&supertrait.path, None) { - match (&path as &str, &supertrait.path.segments.iter().last().unwrap().ident) { + let last_seg = supertrait.path.segments.iter().last().unwrap(); + match (&path as &str, &last_seg.ident, &last_seg.arguments) { $( $($pat)|* => $e, )* } continue; } } if let Some(ident) = supertrait.path.get_ident() { - match (&format!("{}", ident) as &str, &ident) { + match (&format!("{}", ident) as &str, &ident, &syn::PathArguments::None) { $( $($pat)|* => $e, )* } } else if types_opt.is_some() { @@ -269,7 +271,7 @@ macro_rules! get_module_type_resolver { let mut module_iter = module.rsplitn(2, "::"); module_iter.next().unwrap(); let module = module_iter.next().unwrap(); - let imports = ImportResolver::new(module.splitn(2, "::").next().unwrap(), &$crate_types.lib_ast.dependencies, + let imports = ImportResolver::new(module.splitn(2, "::").next().unwrap(), &$crate_types.lib_ast, module, &$crate_types.lib_ast.modules.get(module).unwrap().items); TypeResolver::new(module, imports, $crate_types) } } @@ -291,14 +293,14 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty } writeln_docs(w, &t.attrs, ""); - let mut gen_types = GenericTypes::new(None); + let mut gen_types = GenericTypes::new(Some(format!("{}::{}", types.module_path, trait_name))); // Add functions which may be required for supertrait implementations. // Due to borrow checker limitations, we only support one in-crate supertrait here. let supertrait_name; let supertrait_resolver; walk_supertraits!(t, Some(&types), ( - (s, _i) => { + (s, _i, _) => { if let Some(supertrait) = types.crate_types.traits.get(s) { supertrait_name = s.to_string(); supertrait_resolver = get_module_type_resolver!(supertrait_name, types.crate_libs, types.crate_types); @@ -331,7 +333,6 @@ 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)); @@ -385,20 +386,20 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty } // Add functions which may be required for supertrait implementations. walk_supertraits!(t, Some(&types), ( - ("Clone", _) => { + ("Clone", _, _) => { writeln!(w, "\t/// Called, if set, after this {} has been cloned into a duplicate object.", trait_name).unwrap(); writeln!(w, "\t/// The new {} is provided, and should be mutated as needed to perform a", trait_name).unwrap(); writeln!(w, "\t/// deep copy of the object pointed to by this_arg or avoid any double-freeing.").unwrap(); writeln!(w, "\tpub cloned: Option,", trait_name, trait_name).unwrap(); generated_fields.push(("cloned".to_owned(), None, None)); }, - ("std::cmp::Eq", _)|("core::cmp::Eq", _) => { + ("std::cmp::Eq", _, _)|("core::cmp::Eq", _, _) => { let eq_docs = "Checks if two objects are equal given this object's this_arg pointer and another object."; writeln!(w, "\t/// {}", eq_docs).unwrap(); writeln!(w, "\tpub eq: extern \"C\" fn (this_arg: *const c_void, other_arg: &{}) -> bool,", trait_name).unwrap(); generated_fields.push(("eq".to_owned(), None, Some(format!("\t/** {} */\n", eq_docs)))); }, - ("std::hash::Hash", _)|("core::hash::Hash", _) => { + ("std::hash::Hash", _, _)|("core::hash::Hash", _, _) => { let hash_docs_a = "Calculate a succinct non-cryptographic hash for an object given its this_arg pointer."; let hash_docs_b = "This is used, for example, for inclusion of this object in a hash map."; writeln!(w, "\t/// {}", hash_docs_a).unwrap(); @@ -407,15 +408,15 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty generated_fields.push(("hash".to_owned(), None, Some(format!("\t/**\n\t * {}\n\t * {}\n\t */\n", hash_docs_a, hash_docs_b)))); }, - ("Send", _) => {}, ("Sync", _) => {}, - ("std::fmt::Debug", _)|("core::fmt::Debug", _) => { + ("Send", _, _) => {}, ("Sync", _, _) => {}, + ("std::fmt::Debug", _, _)|("core::fmt::Debug", _, _) => { let debug_docs = "Return a human-readable \"debug\" string describing this object"; writeln!(w, "\t/// {}", debug_docs).unwrap(); writeln!(w, "\tpub debug_str: extern \"C\" fn (this_arg: *const c_void) -> crate::c_types::Str,").unwrap(); generated_fields.push(("debug_str".to_owned(), None, Some(format!("\t/**\n\t * {}\n\t */\n", debug_docs)))); }, - (s, i) => { + (s, i, _) => { // TODO: Both of the below should expose supertrait methods in C++, but doing so is // nontrivial. generated_fields.push(if types.crate_types.traits.get(s).is_none() { @@ -441,17 +442,18 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty writeln!(w, "}}").unwrap(); macro_rules! impl_trait_for_c { - ($t: expr, $impl_accessor: expr, $type_resolver: expr) => { + ($t: expr, $impl_accessor: expr, $type_resolver: expr, $generic_impls: expr) => { + let mut trait_gen_types = gen_types.push_ctx(); + assert!(trait_gen_types.learn_generics_with_impls(&$t.generics, $generic_impls, $type_resolver)); for item in $t.items.iter() { 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() { panic!("1"); } - let mut meth_gen_types = gen_types.push_ctx(); + let mut meth_gen_types = trait_gen_types.push_ctx(); assert!(meth_gen_types.learn_generics(&m.sig.generics, $type_resolver)); // Note that we do *not* use the method generics when printing "native" // rust parts - if the method is generic, we need to print a generic @@ -485,7 +487,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty } _ => panic!("5"), } - $type_resolver.write_rust_type(w, Some(&gen_types), &*arg.ty); + $type_resolver.write_rust_type(w, Some(&gen_types), &*arg.ty, false); } } } @@ -493,7 +495,7 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty match &m.sig.output { syn::ReturnType::Type(_, rtype) => { write!(w, " -> ").unwrap(); - $type_resolver.write_rust_type(w, Some(&gen_types), &*rtype) + $type_resolver.write_rust_type(w, Some(&gen_types), &*rtype, false) }, _ => {}, } @@ -566,17 +568,17 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty // Implement supertraits for the C-mapped struct. walk_supertraits!(t, Some(&types), ( - ("std::cmp::Eq", _)|("core::cmp::Eq", _) => { + ("std::cmp::Eq", _, _)|("core::cmp::Eq", _, _) => { writeln!(w, "impl core::cmp::Eq for {} {{}}", trait_name).unwrap(); writeln!(w, "impl core::cmp::PartialEq for {} {{", trait_name).unwrap(); writeln!(w, "\tfn eq(&self, o: &Self) -> bool {{ (self.eq)(self.this_arg, o) }}\n}}").unwrap(); }, - ("std::hash::Hash", _)|("core::hash::Hash", _) => { + ("std::hash::Hash", _, _)|("core::hash::Hash", _, _) => { writeln!(w, "impl core::hash::Hash for {} {{", trait_name).unwrap(); writeln!(w, "\tfn hash(&self, hasher: &mut H) {{ hasher.write_u64((self.hash)(self.this_arg)) }}\n}}").unwrap(); }, - ("Send", _) => {}, ("Sync", _) => {}, - ("Clone", _) => { + ("Send", _, _) => {}, ("Sync", _, _) => {}, + ("Clone", _, _) => { writeln!(w, "#[no_mangle]").unwrap(); writeln!(w, "/// Creates a copy of a {}", trait_name).unwrap(); writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{", trait_name, trait_name, trait_name).unwrap(); @@ -588,19 +590,41 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty writeln!(w, "\t\t{}_clone(self)", trait_name).unwrap(); writeln!(w, "\t}}\n}}").unwrap(); }, - ("std::fmt::Debug", _)|("core::fmt::Debug", _) => { + ("std::fmt::Debug", _, _)|("core::fmt::Debug", _, _) => { writeln!(w, "impl core::fmt::Debug for {} {{", trait_name).unwrap(); writeln!(w, "\tfn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {{").unwrap(); writeln!(w, "\t\tf.write_str((self.debug_str)(self.this_arg).into_str())").unwrap(); writeln!(w, "\t}}").unwrap(); writeln!(w, "}}").unwrap(); }, - (s, i) => { + (s, i, generic_args) => { if let Some(supertrait) = types.crate_types.traits.get(s) { let resolver = get_module_type_resolver!(s, types.crate_libs, types.crate_types); - writeln!(w, "impl {} for {} {{", s, trait_name).unwrap(); - impl_trait_for_c!(supertrait, format!(".{}", i), &resolver); - writeln!(w, "}}").unwrap(); + macro_rules! impl_supertrait { + ($s: expr, $supertrait: expr, $i: expr, $generic_args: expr) => { + let resolver = get_module_type_resolver!($s, types.crate_libs, types.crate_types); + + // Blindly assume that the same imports where `supertrait` is defined are also + // imported here. This will almost certainly break at some point, but it should be + // a compilation failure when it does so. + write!(w, "impl").unwrap(); + maybe_write_lifetime_generics(w, &$supertrait.generics, types); + write!(w, " {}", $s).unwrap(); + maybe_write_generics(w, &$supertrait.generics, $generic_args, types, false); + writeln!(w, " for {} {{", trait_name).unwrap(); + + impl_trait_for_c!($supertrait, format!(".{}", $i), &resolver, $generic_args); + writeln!(w, "}}").unwrap(); + } + } + impl_supertrait!(s, supertrait, i, generic_args); + walk_supertraits!(supertrait, Some(&resolver), ( + (s, supertrait_i, generic_args) => { + if let Some(supertrait) = types.crate_types.traits.get(s) { + impl_supertrait!(s, supertrait, format!("{}.{}", i, supertrait_i), generic_args); + } + } + ) ); } else { do_write_impl_trait(w, s, i, &trait_name); } @@ -613,9 +637,9 @@ fn writeln_trait<'a, 'b, W: std::io::Write>(w: &mut W, t: &'a syn::ItemTrait, ty write!(w, "impl").unwrap(); maybe_write_lifetime_generics(w, &t.generics, types); write!(w, " rust{}", t.ident).unwrap(); - maybe_write_generics(w, &t.generics, types, false); + maybe_write_generics(w, &t.generics, &syn::PathArguments::None, types, false); writeln!(w, " for {} {{", trait_name).unwrap(); - impl_trait_for_c!(t, "", types); + impl_trait_for_c!(t, "", types, &syn::PathArguments::None); writeln!(w, "}}\n").unwrap(); writeln!(w, "// We're essentially a pointer already, or at least a set of pointers, so allow us to be used").unwrap(); writeln!(w, "// directly as a Deref trait in higher-level structs:").unwrap(); @@ -644,7 +668,7 @@ fn writeln_opaque(w: &mut W, ident: &syn::Ident, struct_name: // https://github.com/eqrion/cbindgen/issues/286 Thus, instead, we import it as a temporary // name and then reference it by that name, which works around the issue. write!(w, "\nuse {}::{} as native{}Import;\npub(crate) type native{} = native{}Import", types.module_path, ident, ident, ident, ident).unwrap(); - maybe_write_generics(w, &generics, &types, true); + maybe_write_generics(w, &generics, &syn::PathArguments::None, &types, true); writeln!(w, ";\n").unwrap(); writeln!(extra_headers, "struct native{}Opaque;\ntypedef struct native{}Opaque LDKnative{};", ident, ident, ident).unwrap(); writeln_docs(w, &attrs, ""); @@ -666,7 +690,7 @@ fn writeln_opaque(w: &mut W, ident: &syn::Ident, struct_name: writeln!(w, "#[allow(unused)]").unwrap(); writeln!(w, "/// Used only if an object of this type is returned as a trait impl by a method").unwrap(); writeln!(w, "pub(crate) extern \"C\" fn {}_free_void(this_ptr: *mut c_void) {{", struct_name).unwrap(); - writeln!(w, "\tunsafe {{ let _ = Box::from_raw(this_ptr as *mut native{}); }}\n}}", struct_name).unwrap(); + writeln!(w, "\tlet _ = unsafe {{ Box::from_raw(this_ptr as *mut native{}) }};\n}}", struct_name).unwrap(); writeln!(w, "#[allow(unused)]").unwrap(); writeln!(w, "impl {} {{", struct_name).unwrap(); writeln!(w, "\tpub(crate) fn get_native_ref(&self) -> &'static native{} {{", struct_name).unwrap(); @@ -727,6 +751,25 @@ fn writeln_struct<'a, 'b, W: std::io::Write>(w: &mut W, s: &'a syn::ItemStruct, write!(w, "inner_val").unwrap(); types.write_to_c_conversion_inline_suffix(w, &ref_type, Some(&gen_types), true); writeln!(w, "\n}}").unwrap(); + } else { + // If the type isn't reference-able, but is clonable, export a getter that just clones + if types.understood_c_type(&$field.ty, Some(&gen_types)) { + let mut v = Vec::new(); + types.write_c_type(&mut v, &$field.ty, Some(&gen_types), true); + let s = String::from_utf8(v).unwrap(); + if types.is_clonable(&s) { + writeln_arg_docs(w, &$field.attrs, "", types, Some(&gen_types), vec![].drain(..), Some(&$field.ty)); + writeln!(w, "///\n/// Returns a copy of the field.").unwrap(); + write!(w, "#[no_mangle]\npub extern \"C\" fn {}_get_{}(this_ptr: &{}) -> {}", struct_name, $new_name, struct_name, s).unwrap(); + write!(w, " {{\n\tlet mut inner_val = this_ptr.get_native_mut_ref().{}.clone();\n\t", $real_name).unwrap(); + let local_var = types.write_to_c_conversion_new_var(w, &format_ident!("inner_val"), &$field.ty, Some(&gen_types), true); + if local_var { write!(w, "\n\t").unwrap(); } + types.write_to_c_conversion_inline_prefix(w, &$field.ty, Some(&gen_types), true); + write!(w, "inner_val").unwrap(); + types.write_to_c_conversion_inline_suffix(w, &$field.ty, Some(&gen_types), true); + writeln!(w, "\n}}").unwrap(); + } + } } } @@ -819,7 +862,8 @@ fn writeln_struct<'a, 'b, W: std::io::Write>(w: &mut W, s: &'a syn::ItemStruct, write!(w, "\t}}").unwrap(); }, syn::Fields::Unnamed(fields) => { - assert!(s.generics.lt_token.is_none()); + assert!(!s.generics.params.iter() + .any(|gen| if let syn::GenericParam::Lifetime(_) = gen { false } else { true })); writeln!(w, "{} (", types.maybe_resolve_ident(&s.ident).unwrap()).unwrap(); for (idx, field) in fields.unnamed.iter().enumerate() { write!(w, "\t\t").unwrap(); @@ -845,7 +889,7 @@ fn writeln_struct<'a, 'b, W: std::io::Write>(w: &mut W, s: &'a syn::ItemStruct, /// Trait struct containing a pointer to the passed struct's inner field and the wrapper functions. /// /// A few non-crate Traits are hard-coded including Default. -fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut TypeResolver) { +fn writeln_impl(w: &mut W, w_uses: &mut HashSet, i: &syn::ItemImpl, types: &mut TypeResolver) { match export_status(&i.attrs) { ExportStatus::Export => {}, ExportStatus::NoExport|ExportStatus::TestOnly => return, @@ -906,7 +950,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ let supertrait_name; let supertrait_resolver; walk_supertraits!(trait_obj, Some(&types), ( - (s, _i) => { + (s, _i, _) => { if let Some(supertrait) = types.crate_types.traits.get(s) { supertrait_name = s.to_string(); supertrait_resolver = get_module_type_resolver!(supertrait_name, types.crate_libs, types.crate_types); @@ -920,7 +964,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ // mappings from a trai defined in a different file, we may mis-resolve or // fail to resolve the mapped types. Thus, we have to construct a new // resolver for the module that the trait was defined in here first. - let 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); gen_types.learn_associated_types(trait_obj, &trait_resolver); let mut impl_associated_types = HashMap::new(); for item in i.items.iter() { @@ -949,11 +993,11 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ // type-conversion logic without actually knowing the concrete native type. if !resolved_path.starts_with(types.module_path) { if !first_seg_is_stdlib(resolved_path.split("::").next().unwrap()) { - writeln!(w, "use crate::{}::native{} as native{};", resolved_path.rsplitn(2, "::").skip(1).next().unwrap(), ident, ident).unwrap(); - writeln!(w, "use crate::{};", resolved_path).unwrap(); - writeln!(w, "use crate::{}_free_void;", resolved_path).unwrap(); + w_uses.insert(format!("use crate::{}::native{} as native{};", resolved_path.rsplitn(2, "::").skip(1).next().unwrap(), ident, ident)); + w_uses.insert(format!("use crate::{};", resolved_path)); + w_uses.insert(format!("use crate::{}_free_void;", resolved_path)); } else { - writeln!(w, "use {} as native{};", resolved_path, ident).unwrap(); + w_uses.insert(format!("use {} as native{};", resolved_path, ident)); } } writeln!(w, "impl From for crate::{} {{", ident, full_trait_path).unwrap(); @@ -1021,26 +1065,47 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } let mut requires_clone = false; walk_supertraits!(trait_obj, Some(&types), ( - ("Clone", _) => { + ("Clone", _, _) => { requires_clone = true; writeln!(w, "\t\tcloned: Some({}_{}_cloned),", trait_obj.ident, ident).unwrap(); }, - ("Sync", _) => {}, ("Send", _) => {}, - ("std::marker::Sync", _) => {}, ("std::marker::Send", _) => {}, - ("core::fmt::Debug", _) => {}, - (s, t) => { + ("Sync", _, _) => {}, ("Send", _, _) => {}, + ("std::marker::Sync", _, _) => {}, ("std::marker::Send", _, _) => {}, + ("core::fmt::Debug", _, _) => {}, + (s, t, _) => { if let Some(supertrait_obj) = types.crate_types.traits.get(s) { - writeln!(w, "\t\t{}: crate::{} {{", t, s).unwrap(); - writeln!(w, "\t\t\tthis_arg: unsafe {{ ObjOps::untweak_ptr((*this_arg).inner) as *mut c_void }},").unwrap(); - writeln!(w, "\t\t\tfree: None,").unwrap(); - for item in supertrait_obj.items.iter() { - match item { - syn::TraitItem::Method(m) => { - write_meth!(m, supertrait_obj, "\t"); + macro_rules! write_impl_fields { + ($s: expr, $supertrait_obj: expr, $t: expr, $pfx: expr, $resolver: expr) => { + writeln!(w, "{}\t{}: crate::{} {{", $pfx, $t, $s).unwrap(); + writeln!(w, "{}\t\tthis_arg: unsafe {{ ObjOps::untweak_ptr((*this_arg).inner) as *mut c_void }},", $pfx).unwrap(); + writeln!(w, "{}\t\tfree: None,", $pfx).unwrap(); + for item in $supertrait_obj.items.iter() { + match item { + syn::TraitItem::Method(m) => { + write_meth!(m, $supertrait_obj, $pfx); + }, + _ => {}, + } + } + walk_supertraits!($supertrait_obj, Some(&$resolver), ( + ("Clone", _, _) => { + writeln!(w, "{}\tcloned: Some({}_{}_cloned),", $pfx, $supertrait_obj.ident, ident).unwrap(); }, - _ => {}, + (_, _, _) => {} + ) ); } } + write_impl_fields!(s, supertrait_obj, t, "\t", types); + + let resolver = get_module_type_resolver!(s, types.crate_libs, types.crate_types); + walk_supertraits!(supertrait_obj, Some(&resolver), ( + (s, t, _) => { + if let Some(supertrait_obj) = types.crate_types.traits.get(s) { + write_impl_fields!(s, supertrait_obj, t, "\t\t", resolver); + write!(w, "\t\t\t}},\n").unwrap(); + } + } + ) ); write!(w, "\t\t}},\n").unwrap(); } else { write_trait_impl_field_assign(w, s, ident); @@ -1050,7 +1115,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "\t}}\n}}\n").unwrap(); macro_rules! impl_meth { - ($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(); @@ -1065,14 +1130,14 @@ 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); + $types.write_c_type(&mut c_type, &*arg.ty, Some(&meth_gen_types), false); if is_type_unconstructable(&String::from_utf8(c_type).unwrap()) { uncallable_function = true; } @@ -1080,17 +1145,12 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ _ => {} } } - if uncallable_function { - let mut trait_resolver = get_module_type_resolver!(full_trait_path, types.crate_libs, types.crate_types); - write_method_params(w, &$trait_meth.sig, "c_void", &mut trait_resolver, Some(&meth_gen_types), true, true); - } else { - write_method_params(w, &$m.sig, "c_void", types, Some(&meth_gen_types), true, true); - } + write_method_params(w, &$trait_meth.sig, "c_void", &mut trait_resolver, 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, &$m.sig, "", types, Some(&meth_gen_types), false); + write_method_var_decl_body(w, &$trait_meth.sig, "", &mut trait_resolver, Some(&meth_gen_types), false); let mut takes_self = false; for inp in $m.sig.inputs.iter() { if let syn::FnArg::Receiver(_) = inp { @@ -1103,6 +1163,14 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ if idx != 0 { t_gen_args += ", " }; t_gen_args += "_" } + // rustc doesn't like <_> if the _ is actually a lifetime, so + // if all the parameters are lifetimes just skip it. + let mut nonlifetime_param = false; + for param in $trait.generics.params.iter() { + if let syn::GenericParam::Lifetime(_) = param {} + else { nonlifetime_param = true; } + } + if !nonlifetime_param { t_gen_args = String::new(); } if takes_self { write!(w, ">::{}(unsafe {{ &mut *(this_arg as *mut native{}) }}, ", ident, $trait_path, t_gen_args, $m.sig.ident, ident).unwrap(); } else { @@ -1120,7 +1188,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ }, _ => {}, } - write_method_call_params(w, &$m.sig, "", types, Some(&meth_gen_types), &real_type, false); + write_method_call_params(w, &$trait_meth.sig, "", &mut trait_resolver, Some(&meth_gen_types), &real_type, false); } write!(w, "\n}}\n").unwrap(); if let syn::ReturnType::Type(_, rtype) = &$m.sig.output { @@ -1130,7 +1198,7 @@ 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(); @@ -1140,24 +1208,28 @@ 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())); + impl_meth!(meth, meth, full_trait_path, trait_obj, "", &mut trait_resolver); + gen_types = old_gen_types; }, - syn::ImplItem::Type(_) => {}, - _ => unimplemented!(), + _ => {}, } } if requires_clone { @@ -1165,7 +1237,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ writeln!(w, "\tnew_obj.this_arg = {}_clone_void(new_obj.this_arg);", ident).unwrap(); writeln!(w, "\tnew_obj.free = Some({}_free_void);", ident).unwrap(); walk_supertraits!(trait_obj, Some(&types), ( - (s, t) => { + (s, t, _) => { if types.crate_types.traits.get(s).is_some() { assert!(!types.is_clonable(s)); // We don't currently support cloning with a clonable supertrait writeln!(w, "\tnew_obj.{}.this_arg = new_obj.this_arg;", t).unwrap(); @@ -1322,6 +1394,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ ExportStatus::NoExport|ExportStatus::TestOnly => continue, ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), } + if m.sig.asyncness.is_some() { continue; } let mut meth_gen_types = gen_types.push_ctx(); assert!(meth_gen_types.learn_generics(&m.sig.generics, types)); if m.defaultness.is_some() { unimplemented!(); } @@ -1370,119 +1443,7 @@ 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() { - 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) => { - 'bounds_check: for bound in type_param.bounds.iter() { - if let syn::TypeParamBound::Trait(trait_bound) = bound { - 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] { - 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; - } - } 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 { - unimplemented!(); - } - } else { unimplemented!(); } - } else { unimplemented!(); } - } else { unimplemented!(); } - } - }, - syn::GenericParam::Lifetime(_) => {}, - 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, - 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: real_aliased })), - trait_: i.trait_.clone(), - unsafety: None, - }; - writeln_impl(w, &aliased_impl, types); - } - } else { - eprintln!("Not implementing anything for {} due to it being marked not exported", ident); - } + create_alias_for_impl(resolved_path, i, types, move |aliased_impl, types| writeln_impl(w, w_uses, &aliased_impl, types)); } else { eprintln!("Not implementing anything for {} due to no-resolve (probably the type isn't pub)", ident); } @@ -1490,6 +1451,168 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ } } +fn create_alias_for_impl(resolved_path: String, i: &syn::ItemImpl, types: &mut TypeResolver, mut callback: F) { + if let Some(aliases) = types.crate_types.reverse_alias_map.get(&resolved_path).cloned() { + 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 new_ty_bounds = 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, + alias_module, &types.crate_types.lib_ast.modules.get(alias_module).unwrap().items); + &alias_resolver_override + } else { &types.types }; + let mut where_clause = syn::WhereClause { where_token: syn::Token![where](Span::call_site()), + predicates: syn::punctuated::Punctuated::new() + }; + for (idx, gen) in i.generics.params.iter().enumerate() { + match gen { + syn::GenericParam::Type(type_param) => { + 'bounds_check: for bound in type_param.bounds.iter() { + if let syn::TypeParamBound::Trait(trait_bound) = bound { + 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_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(generic_arg) = alias_resolver.maybe_resolve_path(&p.path, None) { + new_ty_generics.push((type_param.ident.clone(), syn::Type::Path(p.clone()))); + 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; + } + } else if gen_types.is_some() { + let resp = types.maybe_resolve_path(&p.path, gen_types.as_ref()); + if generic_bound == "core::ops::Deref" && resp.is_some() { + new_ty_bounds.push((type_param.ident.clone(), + string_path_to_syn_path("core::ops::Deref"))); + let mut bounds = syn::punctuated::Punctuated::new(); + bounds.push(syn::TypeParamBound::Trait(syn::TraitBound { + paren_token: None, + modifier: syn::TraitBoundModifier::None, + lifetimes: None, + path: string_path_to_syn_path(&types.resolve_path(&p.path, gen_types.as_ref())), + })); + let mut path = string_path_to_syn_path(&format!("{}::Target", type_param.ident)); + path.leading_colon = None; + where_clause.predicates.push(syn::WherePredicate::Type(syn::PredicateType { + lifetimes: None, + bounded_ty: syn::Type::Path(syn::TypePath { qself: None, path }), + colon_token: syn::Token![:](Span::call_site()), + bounds, + })); + } else { + new_ty_generics.push((type_param.ident.clone(), + gen_types.as_ref().resolve_type(&syn::Type::Path(p.clone())).clone())); + } + need_generics = true; + } else { + unimplemented!(); + } + } else { unimplemented!(); } + } else { unimplemented!(); } + } else { unimplemented!(); } + } + }, + syn::GenericParam::Lifetime(_) => {}, + 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() + new_ty_bounds.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), + })); + } + for (ident, param) in new_ty_bounds.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: Some(syn::token::Colon(Span::call_site())), + bounds: syn::punctuated::Punctuated::from_iter( + Some(syn::TypeParamBound::Trait(syn::TraitBound { + path: param, paren_token: None, lifetimes: None, + modifier: syn::TraitBoundModifier::None, + })) + ), + eq_token: None, + default: None, + })); + } + // ... 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() }; + callback(syn::ItemImpl { + attrs: i.attrs.clone(), + brace_token: syn::token::Brace(Span::call_site()), + defaultness: None, + generics: syn::Generics { + lt_token: None, + params, + gt_token: None, + where_clause: Some(where_clause), + }, + impl_token: syn::Token![impl](Span::call_site()), + items: i.items.clone(), + self_ty: Box::new(syn::Type::Path(syn::TypePath { qself: None, path: real_aliased })), + trait_: i.trait_.clone(), + unsafety: None, + }, types); + } + } else { + eprintln!("Not implementing anything for {} due to it being marked not exported", resolved_path); + } +} + /// Replaces upper case charachters with underscore followed by lower case except the first /// charachter and repeated upper case characthers (which are only made lower case). fn camel_to_snake_case(camel: &str) -> String { @@ -1531,8 +1654,37 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type let mut needs_free = false; let mut constr = Vec::new(); + let mut is_clonable = true; + + for var in e.variants.iter() { + if let syn::Fields::Named(fields) = &var.fields { + needs_free = true; + for field in fields.named.iter() { + if export_status(&field.attrs) == ExportStatus::TestOnly { continue; } + + let mut ty_checks = Vec::new(); + types.write_c_type(&mut ty_checks, &field.ty, Some(&gen_types), false); + if !types.is_clonable(&String::from_utf8(ty_checks).unwrap()) { + is_clonable = false; + } + } + } else if let syn::Fields::Unnamed(fields) = &var.fields { + for field in fields.unnamed.iter() { + let mut ty_checks = Vec::new(); + types.write_c_type(&mut ty_checks, &field.ty, Some(&gen_types), false); + let ty = String::from_utf8(ty_checks).unwrap(); + if ty != "" && !types.is_clonable(&ty) { + is_clonable = false; + } + } + } + } - writeln!(w, "#[must_use]\n#[derive(Clone)]\n#[repr(C)]\npub enum {} {{", e.ident).unwrap(); + if is_clonable { + writeln!(w, "#[derive(Clone)]").unwrap(); + types.crate_types.set_clonable(format!("{}::{}", types.module_path, e.ident)); + } + writeln!(w, "#[must_use]\n#[repr(C)]\npub enum {} {{", e.ident).unwrap(); for var in e.variants.iter() { assert_eq!(export_status(&var.attrs), ExportStatus::Export); // We can't partially-export a mirrored enum writeln_docs(w, &var.attrs, "\t"); @@ -1549,29 +1701,32 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type writeln_field_docs(w, &field.attrs, "\t\t", types, Some(&gen_types), &field.ty); write!(w, "\t\t{}: ", field.ident.as_ref().unwrap()).unwrap(); write!(&mut constr, "{}{}: ", if idx != 0 { ", " } else { "" }, field.ident.as_ref().unwrap()).unwrap(); - types.write_c_type(w, &field.ty, Some(&gen_types), false); - types.write_c_type(&mut constr, &field.ty, Some(&gen_types), false); + types.write_c_type(w, &field.ty, Some(&gen_types), true); + types.write_c_type(&mut constr, &field.ty, Some(&gen_types), true); writeln!(w, ",").unwrap(); } write!(w, "\t}}").unwrap(); } else if let syn::Fields::Unnamed(fields) = &var.fields { if fields.unnamed.len() == 1 { let mut empty_check = Vec::new(); - types.write_c_type(&mut empty_check, &fields.unnamed[0].ty, Some(&gen_types), false); + types.write_c_type(&mut empty_check, &fields.unnamed[0].ty, Some(&gen_types), true); if empty_check.is_empty() { empty_tuple_variant = true; } } if !empty_tuple_variant { needs_free = true; - write!(w, "(").unwrap(); + writeln!(w, "(").unwrap(); for (idx, field) in fields.unnamed.iter().enumerate() { if export_status(&field.attrs) == ExportStatus::TestOnly { continue; } + writeln_field_docs(w, &field.attrs, "\t\t", types, Some(&gen_types), &field.ty); + write!(w, "\t\t").unwrap(); + types.write_c_type(w, &field.ty, Some(&gen_types), true); + write!(&mut constr, "{}: ", ('a' as u8 + idx as u8) as char).unwrap(); - types.write_c_type(w, &field.ty, Some(&gen_types), false); types.write_c_type(&mut constr, &field.ty, Some(&gen_types), false); if idx != fields.unnamed.len() - 1 { - write!(w, ",").unwrap(); + writeln!(w, ",").unwrap(); write!(&mut constr, ",").unwrap(); } } @@ -1589,8 +1744,19 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type } else if let syn::Fields::Unnamed(fields) = &var.fields { if !empty_tuple_variant { write!(&mut constr, "(").unwrap(); - for idx in 0..fields.unnamed.len() { - write!(&mut constr, "{}, ", ('a' as u8 + idx as u8) as char).unwrap(); + for (idx, field) in fields.unnamed.iter().enumerate() { + let mut ref_c_ty = Vec::new(); + let mut nonref_c_ty = Vec::new(); + types.write_c_type(&mut ref_c_ty, &field.ty, Some(&gen_types), false); + types.write_c_type(&mut nonref_c_ty, &field.ty, Some(&gen_types), true); + + if ref_c_ty != nonref_c_ty { + // We blindly assume references in field types are always opaque types, and + // print out an opaque reference -> owned reference conversion here. + write!(&mut constr, "{} {{ inner: {}.inner, is_owned: false }}, ", String::from_utf8(nonref_c_ty).unwrap(), ('a' as u8 + idx as u8) as char).unwrap(); + } else { + write!(&mut constr, "{}, ", ('a' as u8 + idx as u8) as char).unwrap(); + } } writeln!(&mut constr, ")").unwrap(); } else { @@ -1600,7 +1766,10 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type writeln!(&mut constr, "}}").unwrap(); writeln!(w, ",").unwrap(); } - writeln!(w, "}}\nuse {}::{} as native{};\nimpl {} {{", types.module_path, e.ident, e.ident, e.ident).unwrap(); + writeln!(w, "}}\nuse {}::{} as {}Import;", types.module_path, e.ident, e.ident).unwrap(); + write!(w, "pub(crate) type native{} = {}Import", e.ident, e.ident).unwrap(); + maybe_write_generics(w, &e.generics, &syn::PathArguments::None, &types, true); + writeln!(w, ";\n\nimpl {} {{", e.ident).unwrap(); macro_rules! write_conv { ($fn_sig: expr, $to_c: expr, $ref: expr) => { @@ -1618,7 +1787,7 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type } else if let syn::Fields::Unnamed(fields) = &var.fields { if fields.unnamed.len() == 1 { let mut empty_check = Vec::new(); - types.write_c_type(&mut empty_check, &fields.unnamed[0].ty, Some(&gen_types), false); + types.write_c_type(&mut empty_check, &fields.unnamed[0].ty, Some(&gen_types), true); if empty_check.is_empty() { empty_tuple_variant = true; } @@ -1640,17 +1809,17 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type let mut sink = ::std::io::sink(); let mut out: &mut dyn std::io::Write = if $ref { &mut sink } else { w }; let new_var = if $to_c { - types.write_to_c_conversion_new_var(&mut out, $field_ident, &$field.ty, Some(&gen_types), false) + types.write_to_c_conversion_new_var(&mut out, $field_ident, &$field.ty, Some(&gen_types), true) } else { types.write_from_c_conversion_new_var(&mut out, $field_ident, &$field.ty, Some(&gen_types)) }; if $ref || new_var { if $ref { - write!(w, "let mut {}_nonref = (*{}).clone();\n\t\t\t\t", $field_ident, $field_ident).unwrap(); + write!(w, "let mut {}_nonref = Clone::clone({});\n\t\t\t\t", $field_ident, $field_ident).unwrap(); if new_var { let nonref_ident = format_ident!("{}_nonref", $field_ident); if $to_c { - types.write_to_c_conversion_new_var(w, &nonref_ident, &$field.ty, Some(&gen_types), false); + types.write_to_c_conversion_new_var(w, &nonref_ident, &$field.ty, Some(&gen_types), true); } else { types.write_from_c_conversion_new_var(w, &nonref_ident, &$field.ty, Some(&gen_types)); } @@ -1682,14 +1851,14 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type ($field: expr, $field_ident: expr) => { { if export_status(&$field.attrs) == ExportStatus::TestOnly { continue; } if $to_c { - types.write_to_c_conversion_inline_prefix(w, &$field.ty, Some(&gen_types), false); + types.write_to_c_conversion_inline_prefix(w, &$field.ty, Some(&gen_types), true); } else { types.write_from_c_conversion_prefix(w, &$field.ty, Some(&gen_types)); } write!(w, "{}{}", $field_ident, if $ref { "_nonref" } else { "" }).unwrap(); if $to_c { - types.write_to_c_conversion_inline_suffix(w, &$field.ty, Some(&gen_types), false); + types.write_to_c_conversion_inline_suffix(w, &$field.ty, Some(&gen_types), true); } else { types.write_from_c_conversion_suffix(w, &$field.ty, Some(&gen_types)); } @@ -1723,9 +1892,13 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type } } - write_conv!(format!("to_native(&self) -> native{}", e.ident), false, true); + if is_clonable { + write_conv!(format!("to_native(&self) -> native{}", e.ident), false, true); + } write_conv!(format!("into_native(self) -> native{}", e.ident), false, false); - write_conv!(format!("from_native(native: &native{}) -> Self", e.ident), true, true); + if is_clonable { + write_conv!(format!("from_native(native: &native{}) -> Self", e.ident), true, true); + } write_conv!(format!("native_into(native: native{}) -> Self", e.ident), true, false); writeln!(w, "}}").unwrap(); @@ -1733,11 +1906,13 @@ fn writeln_enum<'a, 'b, W: std::io::Write>(w: &mut W, e: &'a syn::ItemEnum, type writeln!(w, "/// Frees any resources used by the {}", e.ident).unwrap(); writeln!(w, "#[no_mangle]\npub extern \"C\" fn {}_free(this_ptr: {}) {{ }}", e.ident, e.ident).unwrap(); } - writeln!(w, "/// Creates a copy of the {}", e.ident).unwrap(); - writeln!(w, "#[no_mangle]").unwrap(); - writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{", e.ident, e.ident, e.ident).unwrap(); - writeln!(w, "\torig.clone()").unwrap(); - writeln!(w, "}}").unwrap(); + if is_clonable { + writeln!(w, "/// Creates a copy of the {}", e.ident).unwrap(); + writeln!(w, "#[no_mangle]").unwrap(); + writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{", e.ident, e.ident, e.ident).unwrap(); + writeln!(w, "\torig.clone()").unwrap(); + writeln!(w, "}}").unwrap(); + } w.write_all(&constr).unwrap(); write_cpp_wrapper(cpp_headers, &format!("{}", e.ident), needs_free, None); } @@ -1762,7 +1937,7 @@ fn writeln_fn<'a, 'b, W: std::io::Write>(w: &mut W, f: &'a syn::ItemFn, types: & write!(w, "{}::{}", types.module_path, f.sig.ident).unwrap(); let mut function_generic_args = Vec::new(); - maybe_write_generics(&mut function_generic_args, &f.sig.generics, types, true); + maybe_write_generics(&mut function_generic_args, &f.sig.generics, &syn::PathArguments::None, types, true); if !function_generic_args.is_empty() { write!(w, "::{}", String::from_utf8(function_generic_args).unwrap()).unwrap(); } @@ -1776,7 +1951,7 @@ fn writeln_fn<'a, 'b, W: std::io::Write>(w: &mut W, f: &'a syn::ItemFn, types: & // *** File/Crate Walking Logic *** // ******************************** -fn convert_priv_mod<'a, 'b: 'a, W: std::io::Write>(w: &mut W, libast: &'b FullLibraryAST, crate_types: &CrateTypes<'b>, out_dir: &str, mod_path: &str, module: &'b syn::ItemMod) { +fn convert_priv_mod<'a, 'b: 'a, W: std::io::Write>(w: &mut W, w_uses: &mut HashSet, libast: &'b FullLibraryAST, crate_types: &CrateTypes<'b>, out_dir: &str, mod_path: &str, module: &'b syn::ItemMod) { // We want to ignore all items declared in this module (as they are not pub), but we still need // to give the ImportResolver any use statements, so we copy them here. let mut use_items = Vec::new(); @@ -1785,15 +1960,15 @@ fn convert_priv_mod<'a, 'b: 'a, W: std::io::Write>(w: &mut W, libast: &'b FullLi use_items.push(item); } } - let import_resolver = ImportResolver::from_borrowed_items(mod_path.splitn(2, "::").next().unwrap(), &libast.dependencies, mod_path, &use_items); + let import_resolver = ImportResolver::from_borrowed_items(mod_path.splitn(2, "::").next().unwrap(), libast, mod_path, &use_items); let mut types = TypeResolver::new(mod_path, import_resolver, crate_types); writeln!(w, "mod {} {{\n{}", module.ident, DEFAULT_IMPORTS).unwrap(); for item in module.content.as_ref().unwrap().1.iter() { match item { - syn::Item::Mod(m) => convert_priv_mod(w, libast, crate_types, out_dir, &format!("{}::{}", mod_path, module.ident), m), + syn::Item::Mod(m) => convert_priv_mod(w, w_uses, libast, crate_types, out_dir, &format!("{}::{}", mod_path, module.ident), m), syn::Item::Impl(i) => { - writeln_impl(w, i, &mut types); + writeln_impl(w, w_uses, i, &mut types); }, _ => {}, } @@ -1820,6 +1995,7 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> let _ = std::fs::create_dir((&new_file_path.as_ref() as &std::path::Path).parent().unwrap()); let mut out = std::fs::OpenOptions::new().write(true).create(true).truncate(true) .open(new_file_path).expect("Unable to open new src file"); + let mut out_uses = HashSet::default(); writeln!(out, "// This file is Copyright its original authors, visible in version control").unwrap(); writeln!(out, "// history and in the source files from which this was generated.").unwrap(); @@ -1866,7 +2042,7 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> eprintln!("Converting {} entries...", module); - let import_resolver = ImportResolver::new(orig_crate, &libast.dependencies, module, items); + let import_resolver = ImportResolver::new(orig_crate, libast, module, items); let mut type_resolver = TypeResolver::new(module, import_resolver, crate_types); for item in items.iter() { @@ -1879,7 +2055,7 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> } }, syn::Item::Impl(i) => { - writeln_impl(&mut out, &i, &mut type_resolver); + writeln_impl(&mut out, &mut out_uses, &i, &mut type_resolver); }, syn::Item::Struct(s) => { if let syn::Visibility::Public(_) = s.vis { @@ -1892,7 +2068,7 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> } }, syn::Item::Mod(m) => { - convert_priv_mod(&mut out, libast, crate_types, out_dir, &format!("{}::{}", module, m.ident), m); + convert_priv_mod(&mut out, &mut out_uses, libast, crate_types, out_dir, &format!("{}::{}", module, m.ident), m); }, syn::Item::Const(c) => { // Re-export any primitive-type constants. @@ -1922,6 +2098,11 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> 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 { @@ -1957,12 +2138,59 @@ fn convert_file<'a, 'b>(libast: &'a FullLibraryAST, crate_types: &CrateTypes<'a> } } + for use_stmt in out_uses { + writeln!(out, "{}", use_stmt).unwrap(); + } + out.flush().unwrap(); } } + +/// Walk the FullLibraryAST, determining if impl aliases need to be marked cloneable. +fn walk_ast_second_pass<'a>(ast_storage: &'a FullLibraryAST, crate_types: &CrateTypes<'a>) { + for (module, astmod) in ast_storage.modules.iter() { + let orig_crate = module.splitn(2, "::").next().unwrap(); + let ASTModule { ref attrs, ref items, .. } = astmod; + assert_eq!(export_status(&attrs), ExportStatus::Export); + + let import_resolver = ImportResolver::new(orig_crate, ast_storage, module, items); + let mut types = TypeResolver::new(module, import_resolver, crate_types); + + for item in items.iter() { + match item { + syn::Item::Impl(i) => { + match export_status(&i.attrs) { + ExportStatus::Export => {}, + ExportStatus::NoExport|ExportStatus::TestOnly => continue, + ExportStatus::NotImplementable => panic!("(C-not implementable) must only appear on traits"), + } + if let Some(trait_path) = i.trait_.as_ref() { + if path_matches_nongeneric(&trait_path.1, &["core", "clone", "Clone"]) || + path_matches_nongeneric(&trait_path.1, &["Clone"]) + { + if let &syn::Type::Path(ref p) = &*i.self_ty { + if let Some(resolved_path) = types.maybe_resolve_path(&p.path, None) { + create_alias_for_impl(resolved_path, i, &mut types, |aliased_impl, types| { + if let &syn::Type::Path(ref p) = &*aliased_impl.self_ty { + if let Some(resolved_aliased_path) = types.maybe_resolve_path(&p.path, None) { + crate_types.set_clonable("crate::".to_owned() + &resolved_aliased_path); + } + } + }); + } + } + } + } + } + _ => {} + } + } + } +} + fn walk_private_mod<'a>(ast_storage: &'a FullLibraryAST, orig_crate: &str, module: String, items: &'a syn::ItemMod, crate_types: &mut CrateTypes<'a>) { - let import_resolver = ImportResolver::new(orig_crate, &ast_storage.dependencies, &module, &items.content.as_ref().unwrap().1); + let import_resolver = ImportResolver::new(orig_crate, ast_storage, &module, &items.content.as_ref().unwrap().1); for item in items.content.as_ref().unwrap().1.iter() { match item { syn::Item::Mod(m) => walk_private_mod(ast_storage, orig_crate, format!("{}::{}", module, m.ident), m, crate_types), @@ -1986,12 +2214,12 @@ fn walk_private_mod<'a>(ast_storage: &'a FullLibraryAST, orig_crate: &str, modul } /// Walk the FullLibraryAST, deciding how things will be mapped and adding tracking to CrateTypes. -fn walk_ast<'a>(ast_storage: &'a FullLibraryAST, crate_types: &mut CrateTypes<'a>) { +fn walk_ast_first_pass<'a>(ast_storage: &'a FullLibraryAST, crate_types: &mut CrateTypes<'a>) { for (module, astmod) in ast_storage.modules.iter() { let ASTModule { ref attrs, ref items, submods: _ } = astmod; assert_eq!(export_status(&attrs), ExportStatus::Export); let orig_crate = module.splitn(2, "::").next().unwrap(); - let import_resolver = ImportResolver::new(orig_crate, &ast_storage.dependencies, module, items); + let import_resolver = ImportResolver::new(orig_crate, ast_storage, module, items); for item in items.iter() { match item { @@ -2017,10 +2245,10 @@ fn walk_ast<'a>(ast_storage: &'a FullLibraryAST, crate_types: &mut CrateTypes<'a } let trait_path = format!("{}::{}", module, t.ident); walk_supertraits!(t, None, ( - ("Clone", _) => { + ("Clone", _, _) => { crate_types.set_clonable("crate::".to_owned() + &trait_path); }, - (_, _) => {} + (_, _, _) => {} ) ); crate_types.traits.insert(trait_path, &t); } @@ -2141,7 +2369,11 @@ fn main() { // ...then walk the ASTs tracking what types we will map, and how, so that we can resolve them // when parsing other file ASTs... let mut libtypes = CrateTypes::new(&mut derived_templates, &libast); - walk_ast(&libast, &mut libtypes); + walk_ast_first_pass(&libast, &mut libtypes); + + // ... using the generated data, determine a few additional fields, specifically which type + // aliases are to be clone-able... + walk_ast_second_pass(&libast, &libtypes); // ... finally, do the actual file conversion/mapping, writing out types as we go. convert_file(&libast, &libtypes, &args[1], &mut header_file, &mut cpp_header_file);