1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE>
5 // or the MIT license <LICENSE-MIT>, at your option.
6 // You may not use this file except in accordance with one or both of these
9 use std::cell::RefCell;
10 use std::collections::{HashMap, HashSet};
17 use proc_macro2::{TokenTree, Span};
18 use quote::format_ident;
21 // The following utils are used purely to build our known types maps - they break down all the
22 // types we need to resolve to include the given object, and no more.
24 pub fn first_seg_self<'a>(t: &'a syn::Type) -> Option<impl Iterator<Item=&syn::PathSegment> + 'a> {
26 syn::Type::Path(p) => {
27 if p.qself.is_some() || p.path.leading_colon.is_some() {
30 let mut segs = p.path.segments.iter();
31 let ty = segs.next().unwrap();
32 if !ty.arguments.is_empty() { return None; }
33 if format!("{}", ty.ident) == "Self" {
41 pub fn get_single_remaining_path_seg<'a, I: Iterator<Item=&'a syn::PathSegment>>(segs: &mut I) -> Option<&'a syn::Ident> {
42 if let Some(ty) = segs.next() {
43 if !ty.arguments.is_empty() { unimplemented!(); }
44 if segs.next().is_some() { return None; }
49 pub fn first_seg_is_stdlib(first_seg_str: &str) -> bool {
50 first_seg_str == "std" || first_seg_str == "core" || first_seg_str == "alloc"
53 pub fn single_ident_generic_path_to_ident(p: &syn::Path) -> Option<&syn::Ident> {
54 if p.segments.len() == 1 {
55 Some(&p.segments.iter().next().unwrap().ident)
59 pub fn path_matches_nongeneric(p: &syn::Path, exp: &[&str]) -> bool {
60 if p.segments.len() != exp.len() { return false; }
61 for (seg, e) in p.segments.iter().zip(exp.iter()) {
62 if seg.arguments != syn::PathArguments::None { return false; }
63 if &format!("{}", seg.ident) != *e { return false; }
68 pub fn string_path_to_syn_path(path: &str) -> syn::Path {
69 let mut segments = syn::punctuated::Punctuated::new();
70 for seg in path.split("::") {
71 segments.push(syn::PathSegment {
72 ident: syn::Ident::new(seg, Span::call_site()),
73 arguments: syn::PathArguments::None,
76 syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments }
79 #[derive(Debug, PartialEq)]
80 pub enum ExportStatus {
84 /// This is used only for traits to indicate that users should not be able to implement their
85 /// own version of a trait, but we should export Rust implementations of the trait (and the
87 /// Concretly, this means that we do not implement the Rust trait for the C trait struct.
90 /// Gets the ExportStatus of an object (struct, fn, etc) given its attributes.
91 pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
92 for attr in attrs.iter() {
93 let tokens_clone = attr.tokens.clone();
94 let mut token_iter = tokens_clone.into_iter();
95 if let Some(token) = token_iter.next() {
97 TokenTree::Punct(c) if c.as_char() == '=' => {
98 // Really not sure where syn gets '=' from here -
99 // it somehow represents '///' or '//!'
101 TokenTree::Group(g) => {
102 if format!("{}", single_ident_generic_path_to_ident(&attr.path).unwrap()) == "cfg" {
103 let mut iter = g.stream().into_iter();
104 if let TokenTree::Ident(i) = iter.next().unwrap() {
106 // #[cfg(any(test, feature = ""))]
107 if let TokenTree::Group(g) = iter.next().unwrap() {
108 let mut all_test = true;
109 for token in g.stream().into_iter() {
110 if let TokenTree::Ident(i) = token {
111 match format!("{}", i).as_str() {
114 _ => all_test = false,
116 } else if let TokenTree::Literal(lit) = token {
117 if format!("{}", lit) != "fuzztarget" {
122 if all_test { return ExportStatus::TestOnly; }
124 } else if i == "test" {
125 return ExportStatus::TestOnly;
129 continue; // eg #[derive()]
131 _ => unimplemented!(),
134 match token_iter.next().unwrap() {
135 TokenTree::Literal(lit) => {
136 let line = format!("{}", lit);
137 if line.contains("(C-not exported)") {
138 return ExportStatus::NoExport;
139 } else if line.contains("(C-not implementable)") {
140 return ExportStatus::NotImplementable;
143 _ => unimplemented!(),
149 pub fn assert_simple_bound(bound: &syn::TraitBound) {
150 if bound.paren_token.is_some() { unimplemented!(); }
151 if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
154 /// Returns true if the enum will be mapped as an opaue (ie struct with a pointer to the underlying
155 /// type), otherwise it is mapped into a transparent, C-compatible version of itself.
156 pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool {
157 for var in e.variants.iter() {
158 if let syn::Fields::Named(fields) = &var.fields {
159 for field in fields.named.iter() {
160 match export_status(&field.attrs) {
161 ExportStatus::Export|ExportStatus::TestOnly => {},
162 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
163 ExportStatus::NoExport => return true,
166 } else if let syn::Fields::Unnamed(fields) = &var.fields {
167 for field in fields.unnamed.iter() {
168 match export_status(&field.attrs) {
169 ExportStatus::Export|ExportStatus::TestOnly => {},
170 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
171 ExportStatus::NoExport => return true,
179 /// A stack of sets of generic resolutions.
181 /// This tracks the template parameters for a function, struct, or trait, allowing resolution into
182 /// a concrete type. By pushing a new context onto the stack, this can track a function's template
183 /// parameters inside of a generic struct or trait.
185 /// It maps both direct types as well as Deref<Target = X>, mapping them via the provided
186 /// TypeResolver's resolve_path function (ie traits map to the concrete jump table, structs to the
187 /// concrete C container struct, etc).
189 pub struct GenericTypes<'a, 'b> {
190 self_ty: Option<String>,
191 parent: Option<&'b GenericTypes<'b, 'b>>,
192 typed_generics: HashMap<&'a syn::Ident, String>,
193 default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type, syn::Type)>,
195 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
196 pub fn new(self_ty: Option<String>) -> Self {
197 Self { self_ty, parent: None, typed_generics: HashMap::new(), default_generics: HashMap::new(), }
200 /// push a new context onto the stack, allowing for a new set of generics to be learned which
201 /// will override any lower contexts, but which will still fall back to resoltion via lower
203 pub fn push_ctx<'c>(&'c self) -> GenericTypes<'a, 'c> {
204 GenericTypes { self_ty: None, parent: Some(self), typed_generics: HashMap::new(), default_generics: HashMap::new(), }
207 /// Learn the generics in generics in the current context, given a TypeResolver.
208 pub fn learn_generics_with_impls<'b, 'c>(&mut self, generics: &'a syn::Generics, impld_generics: &'a syn::PathArguments, types: &'b TypeResolver<'a, 'c>) -> bool {
209 let mut new_typed_generics = HashMap::new();
210 // First learn simple generics...
211 for (idx, generic) in generics.params.iter().enumerate() {
213 syn::GenericParam::Type(type_param) => {
214 let mut non_lifetimes_processed = false;
215 'bound_loop: for bound in type_param.bounds.iter() {
216 if let syn::TypeParamBound::Trait(trait_bound) = bound {
217 if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
218 match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
220 if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
222 assert_simple_bound(&trait_bound);
223 if let Some(path) = types.maybe_resolve_path(&trait_bound.path, None) {
224 if types.skip_path(&path) { continue; }
225 if path == "Sized" { continue; }
226 if non_lifetimes_processed { return false; }
227 non_lifetimes_processed = true;
228 if path != "std::ops::Deref" && path != "core::ops::Deref" {
229 let p = string_path_to_syn_path(&path);
230 let ref_ty = parse_quote!(&#p);
231 let mut_ref_ty = parse_quote!(&mut #p);
232 self.default_generics.insert(&type_param.ident, (syn::Type::Path(syn::TypePath { qself: None, path: p }), ref_ty, mut_ref_ty));
233 new_typed_generics.insert(&type_param.ident, Some(path));
235 // If we're templated on Deref<Target = ConcreteThing>, store
236 // the reference type in `default_generics` which handles full
237 // types and not just paths.
238 if let syn::PathArguments::AngleBracketed(ref args) =
239 trait_bound.path.segments[0].arguments {
240 assert_eq!(trait_bound.path.segments.len(), 1);
241 for subargument in args.args.iter() {
243 syn::GenericArgument::Lifetime(_) => {},
244 syn::GenericArgument::Binding(ref b) => {
245 if &format!("{}", b.ident) != "Target" { return false; }
247 self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default), parse_quote!(&mut #default)));
250 _ => unimplemented!(),
254 new_typed_generics.insert(&type_param.ident, None);
260 if let Some(default) = type_param.default.as_ref() {
261 assert!(type_param.bounds.is_empty());
262 self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default), parse_quote!(&mut #default)));
263 } else if type_param.bounds.is_empty() {
264 if let syn::PathArguments::AngleBracketed(args) = impld_generics {
265 match &args.args[idx] {
266 syn::GenericArgument::Type(ty) => {
267 self.default_generics.insert(&type_param.ident, (ty.clone(), parse_quote!(&#ty), parse_quote!(&mut #ty)));
269 _ => unimplemented!(),
277 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
278 if let Some(wh) = &generics.where_clause {
279 for pred in wh.predicates.iter() {
280 if let syn::WherePredicate::Type(t) = pred {
281 if let syn::Type::Path(p) = &t.bounded_ty {
282 if first_seg_self(&t.bounded_ty).is_some() && p.path.segments.len() == 1 { continue; }
283 if p.qself.is_some() { return false; }
284 if p.path.leading_colon.is_some() { return false; }
285 let mut p_iter = p.path.segments.iter();
286 let p_ident = &p_iter.next().unwrap().ident;
287 if let Some(gen) = new_typed_generics.get_mut(p_ident) {
288 if gen.is_some() { return false; }
289 if &format!("{}", p_iter.next().unwrap().ident) != "Target" {return false; }
291 let mut non_lifetimes_processed = false;
292 for bound in t.bounds.iter() {
293 if let syn::TypeParamBound::Trait(trait_bound) = bound {
294 if let Some(id) = trait_bound.path.get_ident() {
295 if format!("{}", id) == "Sized" { continue; }
297 if non_lifetimes_processed { return false; }
298 non_lifetimes_processed = true;
299 assert_simple_bound(&trait_bound);
300 let resolved = types.resolve_path(&trait_bound.path, None);
301 let ty = syn::Type::Path(syn::TypePath {
302 qself: None, path: string_path_to_syn_path(&resolved)
304 let ref_ty = parse_quote!(&#ty);
305 let mut_ref_ty = parse_quote!(&mut #ty);
306 if types.crate_types.traits.get(&resolved).is_some() {
307 self.default_generics.insert(p_ident, (ty, ref_ty, mut_ref_ty));
309 self.default_generics.insert(p_ident, (ref_ty.clone(), ref_ty, mut_ref_ty));
312 *gen = Some(resolved);
315 } else { return false; }
316 } else { return false; }
320 for (key, value) in new_typed_generics.drain() {
321 if let Some(v) = value {
322 assert!(self.typed_generics.insert(key, v).is_none());
323 } else { return false; }
328 /// Learn the generics in generics in the current context, given a TypeResolver.
329 pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
330 self.learn_generics_with_impls(generics, &syn::PathArguments::None, types)
333 /// Learn the associated types from the trait in the current context.
334 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
335 for item in t.items.iter() {
337 &syn::TraitItem::Type(ref t) => {
338 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
339 let mut bounds_iter = t.bounds.iter();
341 match bounds_iter.next().unwrap() {
342 syn::TypeParamBound::Trait(tr) => {
343 assert_simple_bound(&tr);
344 if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
345 if types.skip_path(&path) { continue; }
346 // In general we handle Deref<Target=X> as if it were just X (and
347 // implement Deref<Target=Self> for relevant types). We don't
348 // bother to implement it for associated types, however, so we just
349 // ignore such bounds.
350 if path != "std::ops::Deref" && path != "core::ops::Deref" {
351 self.typed_generics.insert(&t.ident, path);
353 } else { unimplemented!(); }
354 for bound in bounds_iter {
355 if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
359 syn::TypeParamBound::Lifetime(_) => {},
368 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
370 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<&'b String> {
371 if let Some(ident) = path.get_ident() {
372 if let Some(ty) = &self.self_ty {
373 if format!("{}", ident) == "Self" {
377 if let Some(res) = self.typed_generics.get(ident) {
381 // Associated types are usually specified as "Self::Generic", so we check for that
383 let mut it = path.segments.iter();
384 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
385 let ident = &it.next().unwrap().ident;
386 if let Some(res) = self.typed_generics.get(ident) {
391 if let Some(parent) = self.parent {
392 parent.maybe_resolve_path(path)
399 pub trait ResolveType<'a> { fn resolve_type(&'a self, ty: &'a syn::Type) -> &'a syn::Type; }
400 impl<'a, 'b, 'c: 'a + 'b> ResolveType<'c> for Option<&GenericTypes<'a, 'b>> {
401 fn resolve_type(&'c self, ty: &'c syn::Type) -> &'c syn::Type {
402 if let Some(us) = self {
404 syn::Type::Path(p) => {
405 if let Some(ident) = p.path.get_ident() {
406 if let Some((ty, _, _)) = us.default_generics.get(ident) {
407 return self.resolve_type(ty);
411 syn::Type::Reference(syn::TypeReference { elem, mutability, .. }) => {
412 if let syn::Type::Path(p) = &**elem {
413 if let Some(ident) = p.path.get_ident() {
414 if let Some((_, refty, mut_ref_ty)) = us.default_generics.get(ident) {
415 if mutability.is_some() {
416 return self.resolve_type(mut_ref_ty);
418 return self.resolve_type(refty);
426 us.parent.resolve_type(ty)
431 #[derive(Clone, PartialEq)]
432 // The type of declaration and the object itself
433 pub enum DeclType<'a> {
435 Trait(&'a syn::ItemTrait),
436 StructImported { generics: &'a syn::Generics },
438 EnumIgnored { generics: &'a syn::Generics },
441 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
442 pub crate_name: &'mod_lifetime str,
443 library: &'crate_lft FullLibraryAST,
444 module_path: &'mod_lifetime str,
445 imports: HashMap<syn::Ident, (String, syn::Path)>,
446 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
447 priv_modules: HashSet<syn::Ident>,
449 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
450 fn walk_use_intern<F: FnMut(syn::Ident, (String, syn::Path))>(
451 crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, u: &syn::UseTree,
453 mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>, handle_use: &mut F
456 macro_rules! push_path {
457 ($ident: expr, $path_suffix: expr) => {
458 if partial_path == "" && format!("{}", $ident) == "super" {
459 let mut mod_iter = module_path.rsplitn(2, "::");
460 mod_iter.next().unwrap();
461 let super_mod = mod_iter.next().unwrap();
462 new_path = format!("{}{}", super_mod, $path_suffix);
463 assert_eq!(path.len(), 0);
464 for module in super_mod.split("::") {
465 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
467 } else if partial_path == "" && format!("{}", $ident) == "self" {
468 new_path = format!("{}{}", module_path, $path_suffix);
469 for module in module_path.split("::") {
470 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
472 } else if partial_path == "" && format!("{}", $ident) == "crate" {
473 new_path = format!("{}{}", crate_name, $path_suffix);
474 let crate_name_ident = format_ident!("{}", crate_name);
475 path.push(parse_quote!(#crate_name_ident));
476 } else if partial_path == "" && !dependencies.contains(&$ident) {
477 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
478 let crate_name_ident = format_ident!("{}", crate_name);
479 path.push(parse_quote!(#crate_name_ident));
480 } else if format!("{}", $ident) == "self" {
481 let mut path_iter = partial_path.rsplitn(2, "::");
482 path_iter.next().unwrap();
483 new_path = path_iter.next().unwrap().to_owned();
485 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
488 path.push(parse_quote!(#ident));
492 syn::UseTree::Path(p) => {
493 push_path!(p.ident, "::");
494 Self::walk_use_intern(crate_name, module_path, dependencies, &p.tree, &new_path, path, handle_use);
496 syn::UseTree::Name(n) => {
497 push_path!(n.ident, "");
498 let imported_ident = syn::Ident::new(new_path.rsplitn(2, "::").next().unwrap(), Span::call_site());
499 handle_use(imported_ident, (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
501 syn::UseTree::Group(g) => {
502 for i in g.items.iter() {
503 Self::walk_use_intern(crate_name, module_path, dependencies, i, partial_path, path.clone(), handle_use);
506 syn::UseTree::Rename(r) => {
507 push_path!(r.ident, "");
508 handle_use(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
510 syn::UseTree::Glob(_) => {
511 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
516 fn process_use_intern(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>,
517 imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::UseTree, partial_path: &str,
518 path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>
520 Self::walk_use_intern(crate_name, module_path, dependencies, u, partial_path, path,
521 &mut |k, v| { imports.insert(k, v); });
524 fn process_use(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
525 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
526 Self::process_use_intern(crate_name, module_path, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
529 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
530 let ident = format_ident!("{}", id);
531 let path = parse_quote!(#ident);
532 imports.insert(ident, (id.to_owned(), path));
535 pub fn new(crate_name: &'mod_lifetime str, library: &'crate_lft FullLibraryAST, module_path: &'mod_lifetime str, contents: &'crate_lft [syn::Item]) -> Self {
536 Self::from_borrowed_items(crate_name, library, module_path, &contents.iter().map(|a| a).collect::<Vec<_>>())
538 pub fn from_borrowed_items(crate_name: &'mod_lifetime str, library: &'crate_lft FullLibraryAST, module_path: &'mod_lifetime str, contents: &[&'crate_lft syn::Item]) -> Self {
539 let mut imports = HashMap::new();
540 // Add primitives to the "imports" list:
541 Self::insert_primitive(&mut imports, "bool");
542 Self::insert_primitive(&mut imports, "u128");
543 Self::insert_primitive(&mut imports, "u64");
544 Self::insert_primitive(&mut imports, "u32");
545 Self::insert_primitive(&mut imports, "u16");
546 Self::insert_primitive(&mut imports, "u8");
547 Self::insert_primitive(&mut imports, "usize");
548 Self::insert_primitive(&mut imports, "str");
549 Self::insert_primitive(&mut imports, "String");
551 // These are here to allow us to print native Rust types in trait fn impls even if we don't
553 Self::insert_primitive(&mut imports, "Result");
554 Self::insert_primitive(&mut imports, "Vec");
555 Self::insert_primitive(&mut imports, "Option");
557 let mut declared = HashMap::new();
558 let mut priv_modules = HashSet::new();
560 for item in contents.iter() {
562 syn::Item::Use(u) => Self::process_use(crate_name, module_path, &library.dependencies, &mut imports, &u),
563 syn::Item::Struct(s) => {
564 if let syn::Visibility::Public(_) = s.vis {
565 match export_status(&s.attrs) {
566 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported { generics: &s.generics }); },
567 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
568 ExportStatus::TestOnly => continue,
569 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
573 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
574 if let syn::Visibility::Public(_) = t.vis {
575 declared.insert(t.ident.clone(), DeclType::StructImported { generics: &t.generics });
578 syn::Item::Enum(e) => {
579 if let syn::Visibility::Public(_) = e.vis {
580 match export_status(&e.attrs) {
581 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored { generics: &e.generics }); },
582 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
583 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
588 syn::Item::Trait(t) => {
589 match export_status(&t.attrs) {
590 ExportStatus::Export|ExportStatus::NotImplementable => {
591 if let syn::Visibility::Public(_) = t.vis {
592 declared.insert(t.ident.clone(), DeclType::Trait(t));
598 syn::Item::Mod(m) => {
599 priv_modules.insert(m.ident.clone());
605 Self { crate_name, library, module_path, imports, declared, priv_modules }
608 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
609 self.declared.get(id)
612 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
613 if let Some((imp, _)) = self.imports.get(id) {
615 } else if self.declared.get(id).is_some() {
616 Some(self.module_path.to_string() + "::" + &format!("{}", id))
620 fn maybe_resolve_imported_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
621 if let Some(gen_types) = generics {
622 if let Some(resp) = gen_types.maybe_resolve_path(p) {
623 return Some(resp.clone());
627 if p.leading_colon.is_some() {
628 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
629 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
631 let firstseg = p.segments.iter().next().unwrap();
632 if !self.library.dependencies.contains(&firstseg.ident) {
633 res = self.crate_name.to_owned() + "::" + &res;
636 } else if let Some(id) = p.get_ident() {
637 self.maybe_resolve_ident(id)
639 if p.segments.len() == 1 {
640 let seg = p.segments.iter().next().unwrap();
641 return self.maybe_resolve_ident(&seg.ident);
643 let mut seg_iter = p.segments.iter();
644 let first_seg = seg_iter.next().unwrap();
645 let remaining: String = seg_iter.map(|seg| {
646 format!("::{}", seg.ident)
648 let first_seg_str = format!("{}", first_seg.ident);
649 if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
651 Some(imp.clone() + &remaining)
655 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
656 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
657 } else if first_seg_is_stdlib(&first_seg_str) || self.library.dependencies.contains(&first_seg.ident) {
658 Some(first_seg_str + &remaining)
659 } else if first_seg_str == "crate" {
660 Some(self.crate_name.to_owned() + &remaining)
665 pub fn maybe_resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
666 self.maybe_resolve_imported_path(p, generics).map(|mut path| {
668 // Now that we've resolved the path to the path as-imported, check whether the path
669 // is actually a pub(.*) use statement and map it to the real path.
670 let path_tmp = path.clone();
671 let crate_name = path_tmp.splitn(1, "::").next().unwrap();
672 let mut module_riter = path_tmp.rsplitn(2, "::");
673 let obj = module_riter.next().unwrap();
674 if let Some(module_path) = module_riter.next() {
675 if let Some(m) = self.library.modules.get(module_path) {
676 for item in m.items.iter() {
677 if let syn::Item::Use(syn::ItemUse { vis, tree, .. }) = item {
679 syn::Visibility::Public(_)|
680 syn::Visibility::Crate(_)|
681 syn::Visibility::Restricted(_) => {
682 Self::walk_use_intern(crate_name, module_path,
683 &self.library.dependencies, tree, "",
684 syn::punctuated::Punctuated::new(), &mut |ident, (use_path, _)| {
685 if format!("{}", ident) == obj {
690 syn::Visibility::Inherited => {},
702 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
703 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
705 syn::Type::Path(p) => {
706 if p.path.segments.len() != 1 { unimplemented!(); }
707 let mut args = p.path.segments[0].arguments.clone();
708 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
709 for arg in generics.args.iter_mut() {
710 if let syn::GenericArgument::Type(ref mut t) = arg {
711 *t = self.resolve_imported_refs(t.clone());
715 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
716 p.path = newpath.clone();
718 p.path.segments[0].arguments = args;
720 syn::Type::Reference(r) => {
721 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
723 syn::Type::Slice(s) => {
724 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
726 syn::Type::Tuple(t) => {
727 for e in t.elems.iter_mut() {
728 *e = self.resolve_imported_refs(e.clone());
731 _ => unimplemented!(),
737 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
738 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
739 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
740 // accomplish the same goals, so we just ignore it.
742 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
745 pub struct ASTModule {
746 pub attrs: Vec<syn::Attribute>,
747 pub items: Vec<syn::Item>,
748 pub submods: Vec<String>,
750 /// A struct containing the syn::File AST for each file in the crate.
751 pub struct FullLibraryAST {
752 pub modules: HashMap<String, ASTModule, NonRandomHash>,
753 pub dependencies: HashSet<syn::Ident>,
755 impl FullLibraryAST {
756 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
757 let mut non_mod_items = Vec::with_capacity(items.len());
758 let mut submods = Vec::with_capacity(items.len());
759 for item in items.drain(..) {
761 syn::Item::Mod(m) if m.content.is_some() => {
762 if export_status(&m.attrs) == ExportStatus::Export {
763 if let syn::Visibility::Public(_) = m.vis {
764 let modident = format!("{}", m.ident);
765 let modname = if module != "" {
766 module.clone() + "::" + &modident
768 self.dependencies.insert(m.ident);
771 self.load_module(modname, m.attrs, m.content.unwrap().1);
772 submods.push(modident);
774 non_mod_items.push(syn::Item::Mod(m));
778 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
779 syn::Item::ExternCrate(c) => {
780 if export_status(&c.attrs) == ExportStatus::Export {
781 self.dependencies.insert(c.ident);
784 _ => { non_mod_items.push(item); }
787 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
790 pub fn load_lib(lib: syn::File) -> Self {
791 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
792 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
793 res.load_module("".to_owned(), lib.attrs, lib.items);
798 /// List of manually-generated types which are clonable
799 fn initial_clonable_types() -> HashSet<String> {
800 let mut res = HashSet::new();
801 res.insert("crate::c_types::U5".to_owned());
802 res.insert("crate::c_types::U128".to_owned());
803 res.insert("crate::c_types::FourBytes".to_owned());
804 res.insert("crate::c_types::TwelveBytes".to_owned());
805 res.insert("crate::c_types::SixteenBytes".to_owned());
806 res.insert("crate::c_types::TwentyBytes".to_owned());
807 res.insert("crate::c_types::ThirtyTwoBytes".to_owned());
808 res.insert("crate::c_types::SecretKey".to_owned());
809 res.insert("crate::c_types::PublicKey".to_owned());
810 res.insert("crate::c_types::Transaction".to_owned());
811 res.insert("crate::c_types::Witness".to_owned());
812 res.insert("crate::c_types::TxOut".to_owned());
813 res.insert("crate::c_types::Signature".to_owned());
814 res.insert("crate::c_types::RecoverableSignature".to_owned());
815 res.insert("crate::c_types::Bech32Error".to_owned());
816 res.insert("crate::c_types::Secp256k1Error".to_owned());
817 res.insert("crate::c_types::IOError".to_owned());
818 res.insert("crate::c_types::Error".to_owned());
819 res.insert("crate::c_types::Str".to_owned());
821 // Because some types are manually-mapped to CVec_u8Z we may end up checking if its clonable
822 // before we ever get to constructing the type fully via
823 // `write_c_mangled_container_path_intern` (which will add it here too), so we have to manually
824 // add it on startup.
825 res.insert("crate::c_types::derived::CVec_u8Z".to_owned());
829 /// Top-level struct tracking everything which has been defined while walking the crate.
830 pub struct CrateTypes<'a> {
831 /// This may contain structs or enums, but only when either is mapped as
832 /// struct X { inner: *mut originalX, .. }
833 pub opaques: HashMap<String, (&'a syn::Ident, &'a syn::Generics)>,
834 /// structs that weren't exposed
835 pub priv_structs: HashMap<String, &'a syn::Generics>,
836 /// Enums which are mapped as C enums with conversion functions
837 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
838 /// Traits which are mapped as a pointer + jump table
839 pub traits: HashMap<String, &'a syn::ItemTrait>,
840 /// Aliases from paths to some other Type
841 pub type_aliases: HashMap<String, syn::Type>,
842 /// Value is an alias to Key (maybe with some generics)
843 pub reverse_alias_map: HashMap<String, Vec<(String, syn::PathArguments)>>,
844 /// Template continer types defined, map from mangled type name -> whether a destructor fn
847 /// This is used at the end of processing to make C++ wrapper classes
848 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
849 /// The output file for any created template container types, written to as we find new
850 /// template containers which need to be defined.
851 template_file: RefCell<&'a mut File>,
852 /// Set of containers which are clonable
853 clonable_types: RefCell<HashSet<String>>,
855 pub trait_impls: HashMap<String, Vec<String>>,
856 /// The full set of modules in the crate(s)
857 pub lib_ast: &'a FullLibraryAST,
860 impl<'a> CrateTypes<'a> {
861 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
863 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
864 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
865 templates_defined: RefCell::new(HashMap::default()), priv_structs: HashMap::new(),
866 clonable_types: RefCell::new(initial_clonable_types()), trait_impls: HashMap::new(),
867 template_file: RefCell::new(template_file), lib_ast: &libast,
870 pub fn set_clonable(&self, object: String) {
871 self.clonable_types.borrow_mut().insert(object);
873 pub fn is_clonable(&self, object: &str) -> bool {
874 self.clonable_types.borrow().contains(object)
876 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
877 self.template_file.borrow_mut().write(created_container).unwrap();
878 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
882 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
883 /// module but contains a reference to the overall CrateTypes tracking.
884 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
885 pub module_path: &'mod_lifetime str,
886 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
887 pub types: ImportResolver<'mod_lifetime, 'crate_lft>,
890 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
891 /// happen to get the inner value of a generic.
892 enum EmptyValExpectedTy {
893 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
895 /// A Option mapped as a COption_*Z
897 /// A pointer which we want to convert to a reference.
902 /// Describes the appropriate place to print a general type-conversion string when converting a
904 enum ContainerPrefixLocation {
905 /// Prints a general type-conversion string prefix and suffix outside of the
906 /// container-conversion strings.
908 /// Prints a general type-conversion string prefix and suffix inside of the
909 /// container-conversion strings.
911 /// Does not print the usual type-conversion string prefix and suffix.
915 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
916 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
917 Self { module_path, types, crate_types }
920 // *************************************************
921 // *** Well know type and conversion definitions ***
922 // *************************************************
924 /// Returns true we if can just skip passing this to C entirely
925 pub fn skip_path(&self, full_path: &str) -> bool {
926 full_path == "bitcoin::secp256k1::Secp256k1" ||
927 full_path == "bitcoin::secp256k1::Signing" ||
928 full_path == "bitcoin::secp256k1::Verification"
930 /// Returns true we if can just skip passing this to C entirely
931 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
932 if full_path == "bitcoin::secp256k1::Secp256k1" {
933 "secp256k1::global::SECP256K1"
934 } else { unimplemented!(); }
937 /// Returns true if the object is a primitive and is mapped as-is with no conversion
939 pub fn is_primitive(&self, full_path: &str) -> bool {
950 pub fn is_clonable(&self, ty: &str) -> bool {
951 if self.crate_types.is_clonable(ty) { return true; }
952 if self.is_primitive(ty) { return true; }
958 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
959 /// ignored by for some reason need mapping anyway.
960 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
961 if self.is_primitive(full_path) {
962 return Some(full_path);
965 // Note that no !is_ref types can map to an array because Rust and C's call semantics
966 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
968 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
969 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes"),
970 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
971 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes"),
972 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
973 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
975 "str" if is_ref => Some("crate::c_types::Str"),
976 "alloc::string::String"|"String" => Some("crate::c_types::Str"),
978 "std::time::Duration"|"core::time::Duration" => Some("u64"),
979 "std::time::SystemTime" => Some("u64"),
980 "std::io::Error"|"lightning::io::Error"|"lightning::io::ErrorKind" => Some("crate::c_types::IOError"),
981 "core::fmt::Arguments" if is_ref => Some("crate::c_types::Str"),
983 "core::convert::Infallible" => Some("crate::c_types::NotConstructable"),
985 "bitcoin::bech32::Error"|"bech32::Error"
986 if !is_ref => Some("crate::c_types::Bech32Error"),
987 "bitcoin::secp256k1::Error"|"secp256k1::Error"
988 if !is_ref => Some("crate::c_types::Secp256k1Error"),
990 "core::num::ParseIntError" => Some("crate::c_types::Error"),
991 "core::str::Utf8Error" => Some("crate::c_types::Error"),
993 "bitcoin::bech32::u5"|"bech32::u5" => Some("crate::c_types::U5"),
994 "u128" => Some("crate::c_types::U128"),
995 "core::num::NonZeroU8" => Some("u8"),
997 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some("crate::c_types::PublicKey"),
998 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature"),
999 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature"),
1000 "bitcoin::secp256k1::SecretKey" if is_ref => Some("*const [u8; 32]"),
1001 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey"),
1002 "bitcoin::secp256k1::Scalar" if is_ref => Some("*const crate::c_types::BigEndianScalar"),
1003 "bitcoin::secp256k1::Scalar" if !is_ref => Some("crate::c_types::BigEndianScalar"),
1004 "bitcoin::secp256k1::ecdh::SharedSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
1006 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
1007 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
1008 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
1009 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction"),
1010 "bitcoin::Witness" => Some("crate::c_types::Witness"),
1011 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
1012 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
1013 "bitcoin::util::address::WitnessVersion" => Some("crate::c_types::WitnessVersion"),
1014 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
1015 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
1017 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|"bitcoin::hash_types::ScriptHash"
1018 if is_ref => Some("*const [u8; 20]"),
1019 "bitcoin::hash_types::WScriptHash"
1020 if is_ref => Some("*const [u8; 32]"),
1022 // Newtypes that we just expose in their original form.
1023 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1024 if is_ref => Some("*const [u8; 32]"),
1025 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1026 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
1027 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
1028 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1029 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1030 |"lightning::chain::keysinterface::KeyMaterial"
1031 if is_ref => Some("*const [u8; 32]"),
1032 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1033 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1034 |"lightning::chain::keysinterface::KeyMaterial"
1035 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
1037 "lightning::io::Read" => Some("crate::c_types::u8slice"),
1043 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
1046 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
1047 if self.is_primitive(full_path) {
1048 return Some("".to_owned());
1051 "Vec" if !is_ref => Some("local_"),
1052 "Result" if !is_ref => Some("local_"),
1053 "Option" if is_ref => Some("&local_"),
1054 "Option" => Some("local_"),
1056 "[u8; 32]" if is_ref => Some("unsafe { &*"),
1057 "[u8; 32]" if !is_ref => Some(""),
1058 "[u8; 20]" if !is_ref => Some(""),
1059 "[u8; 16]" if !is_ref => Some(""),
1060 "[u8; 12]" if !is_ref => Some(""),
1061 "[u8; 4]" if !is_ref => Some(""),
1062 "[u8; 3]" if !is_ref => Some(""),
1064 "[u8]" if is_ref => Some(""),
1065 "[usize]" if is_ref => Some(""),
1067 "str" if is_ref => Some(""),
1068 "alloc::string::String"|"String" => Some(""),
1069 "std::io::Error"|"lightning::io::Error"|"lightning::io::ErrorKind" => Some(""),
1070 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
1071 // cannot create a &String.
1073 "core::convert::Infallible" => Some("panic!(\"You must never construct a NotConstructable! : "),
1075 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(""),
1076 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(""),
1078 "core::num::ParseIntError" => Some("u8::from_str_radix(\" a\", 10).unwrap_err() /*"),
1079 "core::str::Utf8Error" => Some("core::str::from_utf8(&[0xff]).unwrap_err() /*"),
1081 "std::time::Duration"|"core::time::Duration" => Some("core::time::Duration::from_secs("),
1082 "std::time::SystemTime" => Some("(::std::time::SystemTime::UNIX_EPOCH + std::time::Duration::from_secs("),
1084 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1086 "core::num::NonZeroU8" => Some("core::num::NonZeroU8::new("),
1088 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" if is_ref => Some("&"),
1089 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(""),
1090 "bitcoin::secp256k1::ecdsa::Signature" if is_ref => Some("&"),
1091 "bitcoin::secp256k1::ecdsa::Signature" => Some(""),
1092 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(""),
1093 "bitcoin::secp256k1::SecretKey" if is_ref => Some("&::bitcoin::secp256k1::SecretKey::from_slice(&unsafe { *"),
1094 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(""),
1095 "bitcoin::secp256k1::Scalar" if !is_ref => Some(""),
1096 "bitcoin::secp256k1::ecdh::SharedSecret" if !is_ref => Some("::bitcoin::secp256k1::ecdh::SharedSecret::from_bytes("),
1098 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
1099 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
1100 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("&"),
1101 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(""),
1102 "bitcoin::Witness" if is_ref => Some("&"),
1103 "bitcoin::Witness" => Some(""),
1104 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::C_to_bitcoin_outpoint("),
1105 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
1106 "bitcoin::network::constants::Network" => Some(""),
1107 "bitcoin::util::address::WitnessVersion" => Some(""),
1108 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
1109 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
1111 "bitcoin::hash_types::PubkeyHash" if is_ref =>
1112 Some("&bitcoin::hash_types::PubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1113 "bitcoin::hash_types::WPubkeyHash" if is_ref =>
1114 Some("&bitcoin::hash_types::WPubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1115 "bitcoin::hash_types::ScriptHash" if is_ref =>
1116 Some("&bitcoin::hash_types::ScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1117 "bitcoin::hash_types::WScriptHash" if is_ref =>
1118 Some("&bitcoin::hash_types::WScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1120 // Newtypes that we just expose in their original form.
1121 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
1122 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
1123 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
1124 "lightning::ln::PaymentHash" if !is_ref => Some("::lightning::ln::PaymentHash("),
1125 "lightning::ln::PaymentHash" if is_ref => Some("&::lightning::ln::PaymentHash(unsafe { *"),
1126 "lightning::ln::PaymentPreimage" if !is_ref => Some("::lightning::ln::PaymentPreimage("),
1127 "lightning::ln::PaymentPreimage" if is_ref => Some("&::lightning::ln::PaymentPreimage(unsafe { *"),
1128 "lightning::ln::PaymentSecret" if !is_ref => Some("::lightning::ln::PaymentSecret("),
1129 "lightning::ln::channelmanager::PaymentId" if !is_ref => Some("::lightning::ln::channelmanager::PaymentId("),
1130 "lightning::ln::channelmanager::PaymentId" if is_ref=> Some("&::lightning::ln::channelmanager::PaymentId( unsafe { *"),
1131 "lightning::ln::channelmanager::InterceptId" if !is_ref => Some("::lightning::ln::channelmanager::InterceptId("),
1132 "lightning::ln::channelmanager::InterceptId" if is_ref=> Some("&::lightning::ln::channelmanager::InterceptId( unsafe { *"),
1133 "lightning::chain::keysinterface::KeyMaterial" if !is_ref => Some("::lightning::chain::keysinterface::KeyMaterial("),
1134 "lightning::chain::keysinterface::KeyMaterial" if is_ref=> Some("&::lightning::chain::keysinterface::KeyMaterial( unsafe { *"),
1136 // List of traits we map (possibly during processing of other files):
1137 "lightning::io::Read" => Some("&mut "),
1140 }.map(|s| s.to_owned())
1142 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
1143 if self.is_primitive(full_path) {
1144 return Some("".to_owned());
1147 "Vec" if !is_ref => Some(""),
1148 "Option" => Some(""),
1149 "Result" if !is_ref => Some(""),
1151 "[u8; 32]" if is_ref => Some("}"),
1152 "[u8; 32]" if !is_ref => Some(".data"),
1153 "[u8; 20]" if !is_ref => Some(".data"),
1154 "[u8; 16]" if !is_ref => Some(".data"),
1155 "[u8; 12]" if !is_ref => Some(".data"),
1156 "[u8; 4]" if !is_ref => Some(".data"),
1157 "[u8; 3]" if !is_ref => Some(".data"),
1159 "[u8]" if is_ref => Some(".to_slice()"),
1160 "[usize]" if is_ref => Some(".to_slice()"),
1162 "str" if is_ref => Some(".into_str()"),
1163 "alloc::string::String"|"String" => Some(".into_string()"),
1164 "std::io::Error"|"lightning::io::Error" => Some(".to_rust()"),
1165 "lightning::io::ErrorKind" => Some(".to_rust_kind()"),
1167 "core::convert::Infallible" => Some("\")"),
1169 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(".into_rust()"),
1170 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(".into_rust()"),
1172 "core::num::ParseIntError" => Some("*/"),
1173 "core::str::Utf8Error" => Some("*/"),
1175 "std::time::Duration"|"core::time::Duration" => Some(")"),
1176 "std::time::SystemTime" => Some("))"),
1178 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1179 "u128" => Some(".into()"),
1180 "core::num::NonZeroU8" => Some(").expect(\"Value must be non-zero\")"),
1182 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(".into_rust()"),
1183 "bitcoin::secp256k1::ecdsa::Signature" => Some(".into_rust()"),
1184 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(".into_rust()"),
1185 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(".into_rust()"),
1186 "bitcoin::secp256k1::SecretKey" if is_ref => Some("}[..]).unwrap()"),
1187 "bitcoin::secp256k1::Scalar" if !is_ref => Some(".into_rust()"),
1188 "bitcoin::secp256k1::ecdh::SharedSecret" if !is_ref => Some(".data)"),
1190 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
1191 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
1192 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(".into_bitcoin()"),
1193 "bitcoin::Witness" => Some(".into_bitcoin()"),
1194 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1195 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
1196 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
1197 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1198 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
1199 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
1201 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|
1202 "bitcoin::hash_types::ScriptHash"|"bitcoin::hash_types::WScriptHash"
1203 if is_ref => Some(" }.clone()))"),
1205 // Newtypes that we just expose in their original form.
1206 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
1207 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
1208 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
1209 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1210 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1211 |"lightning::chain::keysinterface::KeyMaterial"
1212 if !is_ref => Some(".data)"),
1213 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1214 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1215 |"lightning::chain::keysinterface::KeyMaterial"
1216 if is_ref => Some(" })"),
1218 // List of traits we map (possibly during processing of other files):
1219 "lightning::io::Read" => Some(".to_reader()"),
1222 }.map(|s| s.to_owned())
1225 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
1226 if self.is_primitive(full_path) {
1230 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
1231 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
1233 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
1234 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
1235 "bitcoin::hash_types::Txid" => None,
1238 }.map(|s| s.to_owned())
1240 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1241 if self.is_primitive(full_path) {
1242 return Some("".to_owned());
1245 "Result" if !is_ref => Some("local_"),
1246 "Vec" if !is_ref => Some("local_"),
1247 "Option" => Some("local_"),
1249 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1250 "[u8; 32]" if is_ref => Some(""),
1251 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes { data: "),
1252 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
1253 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes { data: "),
1254 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
1255 "[u8; 3]" if is_ref => Some(""),
1257 "[u8]" if is_ref => Some("local_"),
1258 "[usize]" if is_ref => Some("local_"),
1260 "str" if is_ref => Some(""),
1261 "alloc::string::String"|"String" => Some(""),
1263 "std::time::Duration"|"core::time::Duration" => Some(""),
1264 "std::time::SystemTime" => Some(""),
1265 "std::io::Error"|"lightning::io::Error" => Some("crate::c_types::IOError::from_rust("),
1266 "lightning::io::ErrorKind" => Some("crate::c_types::IOError::from_rust_kind("),
1267 "core::fmt::Arguments" => Some("alloc::format!(\"{}\", "),
1269 "core::convert::Infallible" => Some("panic!(\"Cannot construct an Infallible: "),
1271 "bitcoin::bech32::Error"|"bech32::Error"
1272 if !is_ref => Some("crate::c_types::Bech32Error::from_rust("),
1273 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1274 if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
1276 "core::num::ParseIntError" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1277 "core::str::Utf8Error" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1279 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1282 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some("crate::c_types::PublicKey::from_rust(&"),
1283 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature::from_rust(&"),
1284 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature::from_rust(&"),
1285 "bitcoin::secp256k1::SecretKey" if is_ref => Some(""),
1286 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
1287 "bitcoin::secp256k1::Scalar" if !is_ref => Some("crate::c_types::BigEndianScalar::from_rust("),
1288 "bitcoin::secp256k1::ecdh::SharedSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1290 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
1291 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
1292 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("crate::c_types::Transaction::from_bitcoin("),
1293 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction::from_bitcoin(&"),
1294 "bitcoin::Witness" if is_ref => Some("crate::c_types::Witness::from_bitcoin("),
1295 "bitcoin::Witness" if !is_ref => Some("crate::c_types::Witness::from_bitcoin(&"),
1296 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
1297 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
1298 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1299 "bitcoin::util::address::WitnessVersion" => Some(""),
1300 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1301 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1303 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1305 // Newtypes that we just expose in their original form.
1306 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1307 if is_ref => Some(""),
1308 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1309 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1310 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1311 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1312 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1313 |"lightning::chain::keysinterface::KeyMaterial"
1314 if is_ref => Some("&"),
1315 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1316 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1317 |"lightning::chain::keysinterface::KeyMaterial"
1318 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1320 "lightning::io::Read" => Some("crate::c_types::u8slice::from_vec(&crate::c_types::reader_to_vec("),
1323 }.map(|s| s.to_owned())
1325 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1326 if self.is_primitive(full_path) {
1327 return Some("".to_owned());
1330 "Result" if !is_ref => Some(""),
1331 "Vec" if !is_ref => Some(".into()"),
1332 "Option" => Some(""),
1334 "[u8; 32]" if !is_ref => Some(" }"),
1335 "[u8; 32]" if is_ref => Some(""),
1336 "[u8; 20]" if !is_ref => Some(" }"),
1337 "[u8; 16]" if !is_ref => Some(" }"),
1338 "[u8; 12]" if !is_ref => Some(" }"),
1339 "[u8; 4]" if !is_ref => Some(" }"),
1340 "[u8; 3]" if is_ref => Some(""),
1342 "[u8]" if is_ref => Some(""),
1343 "[usize]" if is_ref => Some(""),
1345 "str" if is_ref => Some(".into()"),
1346 "alloc::string::String"|"String" if is_ref => Some(".as_str().into()"),
1347 "alloc::string::String"|"String" => Some(".into()"),
1349 "std::time::Duration"|"core::time::Duration" => Some(".as_secs()"),
1350 "std::time::SystemTime" => Some(".duration_since(::std::time::SystemTime::UNIX_EPOCH).expect(\"Times must be post-1970\").as_secs()"),
1351 "std::io::Error"|"lightning::io::Error"|"lightning::io::ErrorKind" => Some(")"),
1352 "core::fmt::Arguments" => Some(").into()"),
1354 "core::convert::Infallible" => Some("\")"),
1356 "bitcoin::secp256k1::Error"|"bech32::Error"
1357 if !is_ref => Some(")"),
1358 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1359 if !is_ref => Some(")"),
1361 "core::num::ParseIntError" => Some("*/"),
1362 "core::str::Utf8Error" => Some("*/"),
1364 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1365 "u128" => Some(".into()"),
1367 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(")"),
1368 "bitcoin::secp256k1::ecdsa::Signature" => Some(")"),
1369 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(")"),
1370 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(")"),
1371 "bitcoin::secp256k1::SecretKey" if is_ref => Some(".as_ref()"),
1372 "bitcoin::secp256k1::Scalar" if !is_ref => Some(")"),
1373 "bitcoin::secp256k1::ecdh::SharedSecret" if !is_ref => Some(".secret_bytes() }"),
1375 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1376 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1377 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(")"),
1378 "bitcoin::Witness" => Some(")"),
1379 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1380 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1381 "bitcoin::network::constants::Network" => Some(")"),
1382 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1383 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1384 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1386 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1388 // Newtypes that we just expose in their original form.
1389 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1390 if is_ref => Some(".as_inner()"),
1391 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1392 if !is_ref => Some(".into_inner() }"),
1393 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1394 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1395 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1396 |"lightning::chain::keysinterface::KeyMaterial"
1397 if is_ref => Some(".0"),
1398 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1399 |"lightning::ln::channelmanager::PaymentId"|"lightning::ln::channelmanager::InterceptId"
1400 |"lightning::chain::keysinterface::KeyMaterial"
1401 if !is_ref => Some(".0 }"),
1403 "lightning::io::Read" => Some("))"),
1406 }.map(|s| s.to_owned())
1409 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1411 "lightning::ln::PaymentSecret" => Some(".data == [0; 32]"),
1412 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some(".is_null()"),
1413 "bitcoin::secp256k1::ecdsa::Signature" => Some(".is_null()"),
1418 /// When printing a reference to the source crate's rust type, if we need to map it to a
1419 /// different "real" type, it can be done so here.
1420 /// This is useful to work around limitations in the binding type resolver, where we reference
1421 /// a non-public `use` alias.
1422 /// TODO: We should never need to use this!
1423 fn real_rust_type_mapping<'equiv>(&self, thing: &'equiv str) -> &'equiv str {
1425 "lightning::io::Read" => "crate::c_types::io::Read",
1430 // ****************************
1431 // *** Container Processing ***
1432 // ****************************
1434 /// Returns the module path in the generated mapping crate to the containers which we generate
1435 /// when writing to CrateTypes::template_file.
1436 pub fn generated_container_path() -> &'static str {
1437 "crate::c_types::derived"
1439 /// Returns the module path in the generated mapping crate to the container templates, which
1440 /// are then concretized and put in the generated container path/template_file.
1441 fn container_templ_path() -> &'static str {
1445 /// This should just be a closure, but doing so gets an error like
1446 /// error: reached the recursion limit while instantiating `types::TypeResolver::is_transpar...c/types.rs:1358:104: 1358:110]>>`
1447 /// which implies the concrete function instantiation of `is_transparent_container` ends up
1448 /// being recursive.
1449 fn deref_type<'one, 'b: 'one> (obj: &'one &'b syn::Type) -> &'b syn::Type { *obj }
1451 /// Returns true if the path containing the given args is a "transparent" container, ie an
1452 /// Option or a container which does not require a generated continer class.
1453 fn is_transparent_container<'i, I: Iterator<Item=&'i syn::Type>>(&self, full_path: &str, _is_ref: bool, mut args: I, generics: Option<&GenericTypes>) -> bool {
1454 if full_path == "Option" {
1455 let inner = args.next().unwrap();
1456 assert!(args.next().is_none());
1457 match generics.resolve_type(inner) {
1458 syn::Type::Reference(r) => {
1459 let elem = &*r.elem;
1461 syn::Type::Path(_) =>
1462 self.is_transparent_container(full_path, true, [elem].iter().map(Self::deref_type), generics),
1466 syn::Type::Array(a) => {
1467 if let syn::Expr::Lit(l) = &a.len {
1468 if let syn::Lit::Int(i) = &l.lit {
1469 if i.base10_digits().parse::<usize>().unwrap() >= 32 {
1470 let mut buf = Vec::new();
1471 self.write_rust_type(&mut buf, generics, &a.elem, false);
1472 let ty = String::from_utf8(buf).unwrap();
1475 // Blindly assume that if we're trying to create an empty value for an
1476 // array < 32 entries that all-0s may be a valid state.
1479 } else { unimplemented!(); }
1480 } else { unimplemented!(); }
1482 syn::Type::Path(p) => {
1483 if let Some(resolved) = self.maybe_resolve_path(&p.path, generics) {
1484 if self.c_type_has_inner_from_path(&resolved) { return true; }
1485 if self.is_primitive(&resolved) { return false; }
1486 // We want to move to using `Option_` mappings where possible rather than
1487 // manual mappings, as it makes downstream bindings simpler and is more
1488 // clear for users. Thus, we default to false but override for a few
1489 // types which had mappings defined when we were avoiding the `Option_`s.
1490 match &resolved as &str {
1491 "lightning::ln::PaymentSecret" => true,
1492 "lightning::ln::PaymentHash" => true,
1493 "lightning::ln::PaymentPreimage" => true,
1494 "lightning::ln::channelmanager::PaymentId" => true,
1495 "bitcoin::hash_types::BlockHash" => true,
1496 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => true,
1499 } else { unimplemented!(); }
1501 syn::Type::Tuple(_) => false,
1502 _ => unimplemented!(),
1506 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1507 /// not require a generated continer class.
1508 pub fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1509 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1510 syn::PathArguments::None => return false,
1511 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1512 if let syn::GenericArgument::Type(ref ty) = arg {
1514 } else { unimplemented!() }
1516 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1518 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter, generics)
1520 /// Returns true if this is a known, supported, non-transparent container.
1521 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1522 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1524 fn to_c_conversion_container_new_var<'b>(&self, generics: Option<&GenericTypes>, full_path: &str, is_ref: bool, single_contained: Option<&syn::Type>, var_name: &syn::Ident, var_access: &str)
1525 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1526 // expecting one element in the vec per generic type, each of which is inline-converted
1527 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1529 "Result" if !is_ref => {
1531 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1532 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1533 ").into() }", ContainerPrefixLocation::PerConv))
1537 // We should only get here if the single contained has an inner
1538 assert!(self.c_type_has_inner(single_contained.unwrap()));
1540 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1543 if let Some(syn::Type::Reference(_)) = single_contained {
1544 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "(*item)".to_string())], "); }", ContainerPrefixLocation::PerConv))
1546 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1550 let mut is_contained_ref = false;
1551 let contained_struct = if let Some(syn::Type::Path(p)) = single_contained {
1552 Some(self.resolve_path(&p.path, generics))
1553 } else if let Some(syn::Type::Reference(r)) = single_contained {
1554 is_contained_ref = true;
1555 if let syn::Type::Path(p) = &*r.elem {
1556 Some(self.resolve_path(&p.path, generics))
1559 if let Some(inner_path) = contained_struct {
1560 let only_contained_has_inner = self.c_type_has_inner_from_path(&inner_path);
1561 if self.c_type_has_inner_from_path(&inner_path) {
1562 let is_inner_ref = if let Some(syn::Type::Reference(_)) = single_contained { true } else { false };
1564 return Some(("if ", vec![
1565 (".is_none() { core::ptr::null() } else { ObjOps::nonnull_ptr_to_inner(".to_owned(),
1566 format!("({}{}.unwrap())", var_access, if is_inner_ref { "" } else { ".as_ref()" }))
1567 ], ") }", ContainerPrefixLocation::OutsideConv));
1569 return Some(("if ", vec![
1570 (".is_none() { core::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1571 ], " }", ContainerPrefixLocation::OutsideConv));
1573 } else if !self.is_transparent_container("Option", is_ref, [single_contained.unwrap()].iter().map(|a| *a), generics) {
1574 if self.is_primitive(&inner_path) || (!is_contained_ref && !is_ref) || only_contained_has_inner {
1575 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1576 return Some(("if ", vec![
1577 (format!(".is_none() {{ {}::None }} else {{ {}::Some(", inner_name, inner_name),
1578 format!("{}.unwrap()", var_access))
1579 ], ") }", ContainerPrefixLocation::PerConv));
1581 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1582 return Some(("if ", vec![
1583 (format!(".is_none() {{ {}::None }} else {{ {}::Some(/* WARNING: CLONING CONVERSION HERE! &Option<Enum> is otherwise un-expressable. */", inner_name, inner_name),
1584 format!("{}.clone().unwrap()", var_access))
1585 ], ") }", ContainerPrefixLocation::PerConv));
1588 // If c_type_from_path is some (ie there's a manual mapping for the inner
1589 // type), lean on write_empty_rust_val, below.
1592 if let Some(t) = single_contained {
1593 if let syn::Type::Tuple(syn::TypeTuple { elems, .. }) = t {
1594 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1595 if elems.is_empty() {
1596 return Some(("if ", vec![
1597 (format!(".is_none() {{ {}::None }} else {{ {}::Some /* ",
1598 inner_name, inner_name), format!(""))
1599 ], " */ }", ContainerPrefixLocation::PerConv));
1601 return Some(("if ", vec![
1602 (format!(".is_none() {{ {}::None }} else {{ {}::Some(",
1603 inner_name, inner_name), format!("({}.unwrap())", var_access))
1604 ], ") }", ContainerPrefixLocation::PerConv));
1607 if let syn::Type::Reference(syn::TypeReference { elem, .. }) = t {
1608 if let syn::Type::Slice(_) = &**elem {
1609 return Some(("if ", vec![
1610 (".is_none() { SmartPtr::null() } else { SmartPtr::from_obj(".to_string(),
1611 format!("({}.unwrap())", var_access))
1612 ], ") }", ContainerPrefixLocation::PerConv));
1615 let mut v = Vec::new();
1616 self.write_empty_rust_val(generics, &mut v, t);
1617 let s = String::from_utf8(v).unwrap();
1618 return Some(("if ", vec![
1619 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1620 ], " }", ContainerPrefixLocation::PerConv));
1621 } else { unreachable!(); }
1627 /// only_contained_has_inner implies that there is only one contained element in the container
1628 /// and it has an inner field (ie is an "opaque" type we've defined).
1629 fn from_c_conversion_container_new_var<'b>(&self, generics: Option<&GenericTypes>, full_path: &str, is_ref: bool, single_contained: Option<&syn::Type>, var_name: &syn::Ident, var_access: &str)
1630 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1631 // expecting one element in the vec per generic type, each of which is inline-converted
1632 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1633 let mut only_contained_has_inner = false;
1634 let only_contained_resolved = if let Some(syn::Type::Path(p)) = single_contained {
1635 let res = self.resolve_path(&p.path, generics);
1636 only_contained_has_inner = self.c_type_has_inner_from_path(&res);
1640 "Result" if !is_ref => {
1642 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1643 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1644 ")}", ContainerPrefixLocation::PerConv))
1646 "Slice" if is_ref && only_contained_has_inner => {
1647 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1650 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1653 if let Some(resolved) = only_contained_resolved {
1654 if self.is_primitive(&resolved) {
1655 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1656 } else if only_contained_has_inner {
1658 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1660 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1665 if let Some(t) = single_contained {
1667 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_)|syn::Type::Array(_) => {
1668 let mut v = Vec::new();
1669 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1670 let s = String::from_utf8(v).unwrap();
1672 EmptyValExpectedTy::ReferenceAsPointer =>
1673 return Some(("if ", vec![
1674 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1675 ], ") }", ContainerPrefixLocation::NoPrefix)),
1676 EmptyValExpectedTy::OptionType =>
1677 return Some(("{ /* ", vec![
1678 (format!("*/ let {}_opt = {};", var_name, var_access),
1679 format!("}} if {}_opt{} {{ None }} else {{ Some({{ {}_opt.take()", var_name, s, var_name))
1680 ], ") } }", ContainerPrefixLocation::PerConv)),
1681 EmptyValExpectedTy::NonPointer =>
1682 return Some(("if ", vec![
1683 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1684 ], ") }", ContainerPrefixLocation::PerConv)),
1687 syn::Type::Tuple(_) => {
1688 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1690 _ => unimplemented!(),
1692 } else { unreachable!(); }
1698 /// Constructs a reference to the given type, possibly tweaking the type if relevant to make it
1699 /// convertable to C.
1700 pub fn create_ownable_reference(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> Option<syn::Type> {
1701 let default_value = Some(syn::Type::Reference(syn::TypeReference {
1702 and_token: syn::Token!(&)(Span::call_site()), lifetime: None, mutability: None,
1703 elem: Box::new(t.clone()) }));
1704 match generics.resolve_type(t) {
1705 syn::Type::Path(p) => {
1706 if let Some(resolved_path) = self.maybe_resolve_path(&p.path, generics) {
1707 if resolved_path != "Vec" { return default_value; }
1708 if p.path.segments.len() != 1 { unimplemented!(); }
1709 let only_seg = p.path.segments.iter().next().unwrap();
1710 if let syn::PathArguments::AngleBracketed(args) = &only_seg.arguments {
1711 if args.args.len() != 1 { unimplemented!(); }
1712 let inner_arg = args.args.iter().next().unwrap();
1713 if let syn::GenericArgument::Type(ty) = &inner_arg {
1714 let mut can_create = self.c_type_has_inner(&ty);
1715 if let syn::Type::Path(inner) = ty {
1716 if inner.path.segments.len() == 1 &&
1717 format!("{}", inner.path.segments[0].ident) == "Vec" {
1721 if !can_create { return default_value; }
1722 if let Some(inner_ty) = self.create_ownable_reference(&ty, generics) {
1723 return Some(syn::Type::Reference(syn::TypeReference {
1724 and_token: syn::Token![&](Span::call_site()),
1727 elem: Box::new(syn::Type::Slice(syn::TypeSlice {
1728 bracket_token: syn::token::Bracket { span: Span::call_site() },
1729 elem: Box::new(inner_ty)
1732 } else { return default_value; }
1733 } else { unimplemented!(); }
1734 } else { unimplemented!(); }
1735 } else { return None; }
1741 // *************************************************
1742 // *** Type definition during main.rs processing ***
1743 // *************************************************
1745 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1746 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool {
1747 self.crate_types.opaques.get(full_path).is_some()
1750 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1751 pub fn c_type_has_inner(&self, ty: &syn::Type) -> bool {
1753 syn::Type::Path(p) => {
1754 if let Some(full_path) = self.maybe_resolve_path(&p.path, None) {
1755 self.c_type_has_inner_from_path(&full_path)
1758 syn::Type::Reference(r) => {
1759 self.c_type_has_inner(&*r.elem)
1765 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1766 self.types.maybe_resolve_ident(id)
1769 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1770 self.types.maybe_resolve_path(p_arg, generics)
1772 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1773 self.maybe_resolve_path(p, generics).unwrap()
1776 // ***********************************
1777 // *** Original Rust Type Printing ***
1778 // ***********************************
1780 fn in_rust_prelude(resolved_path: &str) -> bool {
1781 match resolved_path {
1789 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path, with_ref_lifetime: bool, generated_crate_ref: bool) {
1790 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1791 if self.is_primitive(&resolved) {
1792 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1794 // TODO: We should have a generic "is from a dependency" check here instead of
1795 // checking for "bitcoin" explicitly.
1796 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1797 write!(w, "{}", resolved).unwrap();
1798 } else if !generated_crate_ref {
1799 // If we're printing a generic argument, it needs to reference the crate, otherwise
1800 // the original crate.
1801 write!(w, "{}", self.real_rust_type_mapping(&resolved)).unwrap();
1803 write!(w, "crate::{}", resolved).unwrap();
1806 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1807 self.write_rust_generic_arg(w, generics_resolver, args.args.iter(), with_ref_lifetime);
1810 if path.leading_colon.is_some() {
1811 write!(w, "::").unwrap();
1813 for (idx, seg) in path.segments.iter().enumerate() {
1814 if idx != 0 { write!(w, "::").unwrap(); }
1815 write!(w, "{}", seg.ident).unwrap();
1816 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1817 self.write_rust_generic_arg(w, generics_resolver, args.args.iter(), with_ref_lifetime);
1822 pub fn write_rust_generic_param<'b, W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, generics: impl Iterator<Item=&'b syn::GenericParam>) {
1823 let mut had_params = false;
1824 for (idx, arg) in generics.enumerate() {
1825 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1828 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1829 syn::GenericParam::Type(t) => {
1830 write!(w, "{}", t.ident).unwrap();
1831 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1832 for (idx, bound) in t.bounds.iter().enumerate() {
1833 if idx != 0 { write!(w, " + ").unwrap(); }
1835 syn::TypeParamBound::Trait(tb) => {
1836 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1837 self.write_rust_path(w, generics_resolver, &tb.path, false, false);
1839 _ => unimplemented!(),
1842 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1844 _ => unimplemented!(),
1847 if had_params { write!(w, ">").unwrap(); }
1850 pub fn write_rust_generic_arg<'b, W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, generics: impl Iterator<Item=&'b syn::GenericArgument>, with_ref_lifetime: bool) {
1851 write!(w, "<").unwrap();
1852 for (idx, arg) in generics.enumerate() {
1853 if idx != 0 { write!(w, ", ").unwrap(); }
1855 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t, with_ref_lifetime),
1856 _ => unimplemented!(),
1859 write!(w, ">").unwrap();
1861 fn do_write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type, with_ref_lifetime: bool, force_crate_ref: bool) {
1862 let real_ty = generics.resolve_type(t);
1863 let mut generate_crate_ref = force_crate_ref || t != real_ty;
1865 syn::Type::Path(p) => {
1866 if p.qself.is_some() {
1869 if let Some(resolved_ty) = self.maybe_resolve_path(&p.path, generics) {
1870 generate_crate_ref |= self.maybe_resolve_path(&p.path, None).as_ref() != Some(&resolved_ty);
1871 if self.crate_types.traits.get(&resolved_ty).is_none() { generate_crate_ref = false; }
1873 self.write_rust_path(w, generics, &p.path, with_ref_lifetime, generate_crate_ref);
1875 syn::Type::Reference(r) => {
1876 write!(w, "&").unwrap();
1877 if let Some(lft) = &r.lifetime {
1878 write!(w, "'{} ", lft.ident).unwrap();
1879 } else if with_ref_lifetime {
1880 write!(w, "'static ").unwrap();
1882 if r.mutability.is_some() {
1883 write!(w, "mut ").unwrap();
1885 self.do_write_rust_type(w, generics, &*r.elem, with_ref_lifetime, generate_crate_ref);
1887 syn::Type::Array(a) => {
1888 write!(w, "[").unwrap();
1889 self.do_write_rust_type(w, generics, &a.elem, with_ref_lifetime, generate_crate_ref);
1890 if let syn::Expr::Lit(l) = &a.len {
1891 if let syn::Lit::Int(i) = &l.lit {
1892 write!(w, "; {}]", i).unwrap();
1893 } else { unimplemented!(); }
1894 } else { unimplemented!(); }
1896 syn::Type::Slice(s) => {
1897 write!(w, "[").unwrap();
1898 self.do_write_rust_type(w, generics, &s.elem, with_ref_lifetime, generate_crate_ref);
1899 write!(w, "]").unwrap();
1901 syn::Type::Tuple(s) => {
1902 write!(w, "(").unwrap();
1903 for (idx, t) in s.elems.iter().enumerate() {
1904 if idx != 0 { write!(w, ", ").unwrap(); }
1905 self.do_write_rust_type(w, generics, &t, with_ref_lifetime, generate_crate_ref);
1907 write!(w, ")").unwrap();
1909 _ => unimplemented!(),
1912 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type, with_ref_lifetime: bool) {
1913 self.do_write_rust_type(w, generics, t, with_ref_lifetime, false);
1917 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1918 /// unint'd memory).
1919 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1921 syn::Type::Reference(r) => {
1922 self.write_empty_rust_val(generics, w, &*r.elem)
1924 syn::Type::Path(p) => {
1925 let resolved = self.resolve_path(&p.path, generics);
1926 if self.crate_types.opaques.get(&resolved).is_some() {
1927 write!(w, "crate::{} {{ inner: core::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1929 // Assume its a manually-mapped C type, where we can just define an null() fn
1930 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1933 syn::Type::Array(a) => {
1934 if let syn::Expr::Lit(l) = &a.len {
1935 if let syn::Lit::Int(i) = &l.lit {
1936 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1937 // Blindly assume that if we're trying to create an empty value for an
1938 // array < 32 entries that all-0s may be a valid state.
1941 let arrty = format!("[u8; {}]", i.base10_digits());
1942 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1943 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1944 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1945 } else { unimplemented!(); }
1946 } else { unimplemented!(); }
1948 _ => unimplemented!(),
1952 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1953 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1954 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1955 let mut split = real_ty.split("; ");
1956 split.next().unwrap();
1957 let tail_str = split.next().unwrap();
1958 assert!(split.next().is_none());
1959 let len = usize::from_str_radix(&tail_str[..tail_str.len() - 1], 10).unwrap();
1960 Some(parse_quote!([u8; #len]))
1965 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1966 /// See EmptyValExpectedTy for information on return types.
1967 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1969 syn::Type::Reference(r) => {
1970 return self.write_empty_rust_val_check_suffix(generics, w, &*r.elem);
1972 syn::Type::Path(p) => {
1973 let resolved = self.resolve_path(&p.path, generics);
1974 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1975 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1977 if self.crate_types.opaques.get(&resolved).is_some() {
1978 write!(w, ".inner.is_null()").unwrap();
1979 EmptyValExpectedTy::NonPointer
1981 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1982 write!(w, "{}", suffix).unwrap();
1983 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1984 EmptyValExpectedTy::NonPointer
1986 write!(w, ".is_none()").unwrap();
1987 EmptyValExpectedTy::OptionType
1991 syn::Type::Array(a) => {
1992 if let syn::Expr::Lit(l) = &a.len {
1993 if let syn::Lit::Int(i) = &l.lit {
1994 write!(w, ".data == [0; {}]", i.base10_digits()).unwrap();
1995 EmptyValExpectedTy::NonPointer
1996 } else { unimplemented!(); }
1997 } else { unimplemented!(); }
1999 syn::Type::Slice(_) => {
2000 // Option<[]> always implies that we want to treat len() == 0 differently from
2001 // None, so we always map an Option<[]> into a pointer.
2002 write!(w, " == core::ptr::null_mut()").unwrap();
2003 EmptyValExpectedTy::ReferenceAsPointer
2005 _ => unimplemented!(),
2009 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
2010 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
2012 syn::Type::Reference(r) => {
2013 self.write_empty_rust_val_check(generics, w, &*r.elem, var_access);
2015 syn::Type::Path(_) => {
2016 write!(w, "{}", var_access).unwrap();
2017 self.write_empty_rust_val_check_suffix(generics, w, t);
2019 syn::Type::Array(a) => {
2020 if let syn::Expr::Lit(l) = &a.len {
2021 if let syn::Lit::Int(i) = &l.lit {
2022 let arrty = format!("[u8; {}]", i.base10_digits());
2023 // We don't (yet) support a new-var conversion here.
2024 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
2026 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
2028 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
2029 self.write_empty_rust_val_check_suffix(generics, w, t);
2030 } else { unimplemented!(); }
2031 } else { unimplemented!(); }
2033 _ => unimplemented!(),
2037 // ********************************
2038 // *** Type conversion printing ***
2039 // ********************************
2041 /// Returns true we if can just skip passing this to C entirely
2042 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2044 syn::Type::Path(p) => {
2045 if p.qself.is_some() { unimplemented!(); }
2046 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2047 self.skip_path(&full_path)
2050 syn::Type::Reference(r) => {
2051 self.skip_arg(&*r.elem, generics)
2056 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2058 syn::Type::Path(p) => {
2059 if p.qself.is_some() { unimplemented!(); }
2060 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2061 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
2064 syn::Type::Reference(r) => {
2065 self.no_arg_to_rust(w, &*r.elem, generics);
2071 fn write_conversion_inline_intern<W: std::io::Write,
2072 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool, Option<&str>) -> String>
2073 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
2074 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
2075 match generics.resolve_type(t) {
2076 syn::Type::Reference(r) => {
2077 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
2078 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
2080 syn::Type::Path(p) => {
2081 if p.qself.is_some() {
2085 let resolved_path = self.resolve_path(&p.path, generics);
2086 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
2087 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
2088 } else if self.is_primitive(&resolved_path) {
2089 if is_ref && prefix {
2090 write!(w, "*").unwrap();
2092 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
2093 write!(w, "{}", c_type).unwrap();
2094 } else if let Some((_, generics)) = self.crate_types.opaques.get(&resolved_path) {
2095 decl_lookup(w, &DeclType::StructImported { generics: &generics }, &resolved_path, is_ref, is_mut);
2096 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
2097 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
2098 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
2099 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
2100 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
2101 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
2102 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
2103 } else { unimplemented!(); }
2104 } else { unimplemented!(); }
2106 syn::Type::Array(a) => {
2107 // We assume all arrays contain only [int_literal; X]s.
2108 // This may result in some outputs not compiling.
2109 if let syn::Expr::Lit(l) = &a.len {
2110 if let syn::Lit::Int(i) = &l.lit {
2111 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
2112 } else { unimplemented!(); }
2113 } else { unimplemented!(); }
2115 syn::Type::Slice(s) => {
2116 // We assume all slices contain only literals or references.
2117 // This may result in some outputs not compiling.
2118 if let syn::Type::Path(p) = &*s.elem {
2119 let resolved = self.resolve_path(&p.path, generics);
2120 if self.is_primitive(&resolved) {
2121 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
2123 write!(w, "{}", sliceconv(true, None)).unwrap();
2125 } else if let syn::Type::Reference(r) = &*s.elem {
2126 if let syn::Type::Path(p) = &*r.elem {
2127 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)), None)).unwrap();
2128 } else if let syn::Type::Slice(_) = &*r.elem {
2129 write!(w, "{}", sliceconv(false, None)).unwrap();
2130 } else { unimplemented!(); }
2131 } else if let syn::Type::Tuple(t) = &*s.elem {
2132 assert!(!t.elems.is_empty());
2134 write!(w, "{}", sliceconv(false, None)).unwrap();
2136 let mut needs_map = false;
2137 for e in t.elems.iter() {
2138 if let syn::Type::Reference(_) = e {
2143 let mut map_str = Vec::new();
2144 write!(&mut map_str, ".map(|(").unwrap();
2145 for i in 0..t.elems.len() {
2146 write!(&mut map_str, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
2148 write!(&mut map_str, ")| (").unwrap();
2149 for (idx, e) in t.elems.iter().enumerate() {
2150 if let syn::Type::Reference(_) = e {
2151 write!(&mut map_str, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
2152 } else if let syn::Type::Path(_) = e {
2153 write!(&mut map_str, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
2154 } else { unimplemented!(); }
2156 write!(&mut map_str, "))").unwrap();
2157 write!(w, "{}", sliceconv(false, Some(&String::from_utf8(map_str).unwrap()))).unwrap();
2159 write!(w, "{}", sliceconv(false, None)).unwrap();
2162 } else if let syn::Type::Array(_) = &*s.elem {
2163 write!(w, "{}", sliceconv(false, Some(".map(|a| *a)"))).unwrap();
2164 } else { unimplemented!(); }
2166 syn::Type::Tuple(t) => {
2167 if t.elems.is_empty() {
2168 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
2169 // so work around it by just pretending its a 0u8
2170 write!(w, "{}", tupleconv).unwrap();
2172 if prefix { write!(w, "local_").unwrap(); }
2175 _ => unimplemented!(),
2179 fn write_to_c_conversion_inline_prefix_inner<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, ptr_for_ref: bool, from_ptr: bool) {
2180 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "() /*", true, |_, _| "local_".to_owned(),
2181 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
2182 |w, decl_type, decl_path, is_ref, _is_mut| {
2184 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(", decl_path).unwrap(),
2185 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(", decl_path).unwrap(),
2186 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
2187 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref && from_ptr => {
2188 if !ptr_for_ref { write!(w, "&").unwrap(); }
2189 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap()
2191 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref => {
2192 if !ptr_for_ref { write!(w, "&").unwrap(); }
2193 write!(w, "crate::{} {{ inner: unsafe {{ ObjOps::nonnull_ptr_to_inner((", decl_path).unwrap()
2195 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2196 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
2197 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref =>
2198 write!(w, "crate::{} {{ inner: ObjOps::heap_alloc(", decl_path).unwrap(),
2199 DeclType::Trait(_) if is_ref => write!(w, "").unwrap(),
2200 DeclType::Trait(_) if !is_ref => write!(w, "Into::into(").unwrap(),
2201 _ => panic!("{:?}", decl_path),
2205 pub fn write_to_c_conversion_inline_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2206 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
2208 fn write_to_c_conversion_inline_suffix_inner<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, ptr_for_ref: bool, from_ptr: bool) {
2209 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_, _| ".into()".to_owned(),
2210 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
2211 |w, decl_type, full_path, is_ref, _is_mut| match decl_type {
2212 DeclType::MirroredEnum => write!(w, ")").unwrap(),
2213 DeclType::EnumIgnored { generics }|DeclType::StructImported { generics } if is_ref => {
2214 write!(w, " as *const {}<", full_path).unwrap();
2215 for param in generics.params.iter() {
2216 if let syn::GenericParam::Lifetime(_) = param {
2217 write!(w, "'_, ").unwrap();
2219 write!(w, "_, ").unwrap();
2223 write!(w, ">) as *mut _ }}, is_owned: false }}").unwrap();
2225 write!(w, ">) as *mut _) }}, is_owned: false }}").unwrap();
2228 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2229 write!(w, ", is_owned: true }}").unwrap(),
2230 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref => write!(w, "), is_owned: true }}").unwrap(),
2231 DeclType::Trait(_) if is_ref => {},
2232 DeclType::Trait(_) => {
2233 // This is used when we're converting a concrete Rust type into a C trait
2234 // for use when a Rust trait method returns an associated type.
2235 // Because all of our C traits implement From<RustTypesImplementingTraits>
2236 // we can just call .into() here and be done.
2237 write!(w, ")").unwrap()
2239 _ => unimplemented!(),
2242 pub fn write_to_c_conversion_inline_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2243 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
2246 fn write_from_c_conversion_prefix_inner<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, _ptr_for_ref: bool) {
2247 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2248 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
2249 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2250 DeclType::StructImported {..} if is_ref => write!(w, "").unwrap(),
2251 DeclType::StructImported {..} if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
2252 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
2253 DeclType::MirroredEnum => {},
2254 DeclType::Trait(_) => {},
2255 _ => unimplemented!(),
2258 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2259 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
2261 fn write_from_c_conversion_suffix_inner<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, ptr_for_ref: bool) {
2262 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
2263 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2264 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2265 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2266 (true, None) => "[..]".to_owned(),
2267 (true, Some(_)) => unreachable!(),
2269 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2270 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
2271 DeclType::StructImported {..} if is_ref && ptr_for_ref => write!(w, "XXX unimplemented").unwrap(),
2272 DeclType::StructImported {..} if is_mut && is_ref => write!(w, ".get_native_mut_ref()").unwrap(),
2273 DeclType::StructImported {..} if is_ref => write!(w, ".get_native_ref()").unwrap(),
2274 DeclType::StructImported {..} if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
2275 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
2276 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
2277 DeclType::Trait(_) => {},
2278 _ => unimplemented!(),
2281 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2282 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
2284 // Note that compared to the above conversion functions, the following two are generally
2285 // significantly undertested:
2286 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2287 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2289 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
2290 Some(format!("&{}", conv))
2293 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2294 DeclType::StructImported {..} if !is_ref => write!(w, "").unwrap(),
2295 _ => unimplemented!(),
2298 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2299 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
2300 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2301 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2302 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2303 (true, None) => "[..]".to_owned(),
2304 (true, Some(_)) => unreachable!(),
2306 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2307 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2308 DeclType::StructImported {..} if !is_ref => write!(w, ".get_native_ref()").unwrap(),
2309 _ => unimplemented!(),
2313 fn write_conversion_new_var_intern<'b, W: std::io::Write,
2314 LP: Fn(&str, bool) -> Option<(&str, &str)>,
2315 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
2316 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
2317 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
2318 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
2319 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool, from_ownable_ref: bool,
2320 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
2322 macro_rules! convert_container {
2323 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
2324 // For slices (and Options), we refuse to directly map them as is_ref when they
2325 // aren't opaque types containing an inner pointer. This is due to the fact that,
2326 // in both cases, the actual higher-level type is non-is_ref.
2327 let (ty_has_inner, ty_is_trait) = if $args_len == 1 {
2328 let ty = $args_iter().next().unwrap();
2329 if $container_type == "Slice" && to_c {
2330 // "To C ptr_for_ref" means "return the regular object with is_owned
2331 // set to false", which is totally what we want in a slice if we're about to
2332 // set ty_has_inner.
2335 if let syn::Type::Reference(t) = ty {
2336 if let syn::Type::Path(p) = &*t.elem {
2337 let resolved = self.resolve_path(&p.path, generics);
2338 (self.c_type_has_inner_from_path(&resolved), self.crate_types.traits.get(&resolved).is_some())
2339 } else { (false, false) }
2340 } else if let syn::Type::Path(p) = ty {
2341 let resolved = self.resolve_path(&p.path, generics);
2342 (self.c_type_has_inner_from_path(&resolved), self.crate_types.traits.get(&resolved).is_some())
2343 } else { (false, false) }
2344 } else { (true, false) };
2346 // Options get a bunch of special handling, since in general we map Option<>al
2347 // types into the same C type as non-Option-wrapped types. This ends up being
2348 // pretty manual here and most of the below special-cases are for Options.
2349 let mut needs_ref_map = false;
2350 let mut only_contained_type = None;
2351 let mut only_contained_type_nonref = None;
2352 let mut only_contained_has_inner = false;
2353 let mut contains_slice = false;
2355 only_contained_has_inner = ty_has_inner;
2356 let arg = $args_iter().next().unwrap();
2357 if let syn::Type::Reference(t) = arg {
2358 only_contained_type = Some(arg);
2359 only_contained_type_nonref = Some(&*t.elem);
2360 if let syn::Type::Path(_) = &*t.elem {
2362 } else if let syn::Type::Slice(_) = &*t.elem {
2363 contains_slice = true;
2364 } else { return false; }
2365 // If the inner element contains an inner pointer, we will just use that,
2366 // avoiding the need to map elements to references. Otherwise we'll need to
2367 // do an extra mapping step.
2368 needs_ref_map = !only_contained_has_inner && !ty_is_trait && $container_type == "Option";
2370 only_contained_type = Some(arg);
2371 only_contained_type_nonref = Some(arg);
2375 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref, only_contained_type, ident, var) {
2376 assert_eq!(conversions.len(), $args_len);
2377 write!(w, "let mut local_{}{} = ", ident,
2378 if (!to_c && needs_ref_map) || (to_c && $container_type == "Option" && contains_slice) {"_base"} else { "" }).unwrap();
2379 if prefix_location == ContainerPrefixLocation::OutsideConv {
2380 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, true, true);
2382 write!(w, "{}{}", prefix, var).unwrap();
2384 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
2385 let mut var = std::io::Cursor::new(Vec::new());
2386 write!(&mut var, "{}", var_name).unwrap();
2387 let var_access = String::from_utf8(var.into_inner()).unwrap();
2389 let conv_ty = if needs_ref_map { only_contained_type_nonref.as_ref().unwrap() } else { ty };
2391 write!(w, "{} {{ ", pfx).unwrap();
2392 let new_var_name = format!("{}_{}", ident, idx);
2393 let new_var = self.write_conversion_new_var_intern(w, &format_ident!("{}", new_var_name),
2394 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref,
2395 to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2396 if new_var { write!(w, " ").unwrap(); }
2398 if prefix_location == ContainerPrefixLocation::PerConv {
2399 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2400 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2401 write!(w, "ObjOps::heap_alloc(").unwrap();
2404 write!(w, "{}{}", if contains_slice && !to_c { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
2405 if prefix_location == ContainerPrefixLocation::PerConv {
2406 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2407 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2408 write!(w, ")").unwrap();
2410 write!(w, " }}").unwrap();
2412 write!(w, "{}", suffix).unwrap();
2413 if prefix_location == ContainerPrefixLocation::OutsideConv {
2414 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2416 write!(w, ";").unwrap();
2417 if !to_c && needs_ref_map {
2418 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
2420 write!(w, ".map(|a| &a[..])").unwrap();
2422 write!(w, ";").unwrap();
2423 } else if to_c && $container_type == "Option" && contains_slice {
2424 write!(w, " let mut local_{} = *local_{}_base;", ident, ident).unwrap();
2431 match generics.resolve_type(t) {
2432 syn::Type::Reference(r) => {
2433 if let syn::Type::Slice(_) = &*r.elem {
2434 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, is_ref, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix)
2436 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, true, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix)
2439 syn::Type::Path(p) => {
2440 if p.qself.is_some() {
2443 let resolved_path = self.resolve_path(&p.path, generics);
2444 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
2445 return self.write_conversion_new_var_intern(w, ident, var, aliased_type, None, is_ref, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2447 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2448 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
2449 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
2450 if let syn::GenericArgument::Type(ty) = arg {
2451 generics.resolve_type(ty)
2452 } else { unimplemented!(); }
2454 } else { unimplemented!(); }
2456 if self.is_primitive(&resolved_path) {
2458 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
2459 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
2460 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2462 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
2467 syn::Type::Array(_) => {
2468 // We assume all arrays contain only primitive types.
2469 // This may result in some outputs not compiling.
2472 syn::Type::Slice(s) => {
2473 if let syn::Type::Path(p) = &*s.elem {
2474 let resolved = self.resolve_path(&p.path, generics);
2475 if self.is_primitive(&resolved) {
2476 let slice_path = format!("[{}]", resolved);
2477 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
2478 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2482 let tyref = [&*s.elem];
2484 // If we're converting from a slice to a Vec, assume we can clone the
2485 // elements and clone them into a new Vec first. Next we'll walk the
2486 // new Vec here and convert them to C types.
2487 write!(w, "let mut local_{}_clone = Vec::new(); local_{}_clone.extend_from_slice({}); let mut {} = local_{}_clone; ", ident, ident, ident, ident, ident).unwrap();
2490 convert_container!("Vec", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2491 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2493 } else if let syn::Type::Reference(ty) = &*s.elem {
2494 let tyref = if from_ownable_ref || !to_c { [&*ty.elem] } else { [&*s.elem] };
2496 convert_container!("Slice", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2497 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2498 } else if let syn::Type::Tuple(t) = &*s.elem {
2499 // When mapping into a temporary new var, we need to own all the underlying objects.
2500 // Thus, we drop any references inside the tuple and convert with non-reference types.
2501 let mut elems = syn::punctuated::Punctuated::new();
2502 for elem in t.elems.iter() {
2503 if let syn::Type::Reference(r) = elem {
2504 elems.push((*r.elem).clone());
2506 elems.push(elem.clone());
2509 let ty = [syn::Type::Tuple(syn::TypeTuple {
2510 paren_token: t.paren_token, elems
2514 convert_container!("Slice", 1, || ty.iter());
2515 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2516 } else if let syn::Type::Array(_) = &*s.elem {
2519 let arr_elem = [(*s.elem).clone()];
2520 convert_container!("Slice", 1, || arr_elem.iter());
2521 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2522 } else { unimplemented!() }
2524 syn::Type::Tuple(t) => {
2525 if !t.elems.is_empty() {
2526 // We don't (yet) support tuple elements which cannot be converted inline
2527 write!(w, "let (").unwrap();
2528 for idx in 0..t.elems.len() {
2529 if idx != 0 { write!(w, ", ").unwrap(); }
2530 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
2532 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
2533 // Like other template types, tuples are always mapped as their non-ref
2534 // versions for types which have different ref mappings. Thus, we convert to
2535 // non-ref versions and handle opaque types with inner pointers manually.
2536 for (idx, elem) in t.elems.iter().enumerate() {
2537 if let syn::Type::Path(p) = elem {
2538 let v_name = format!("orig_{}_{}", ident, idx);
2539 let tuple_elem_ident = format_ident!("{}", &v_name);
2540 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
2541 false, ptr_for_ref, to_c, from_ownable_ref,
2542 path_lookup, container_lookup, var_prefix, var_suffix) {
2543 write!(w, " ").unwrap();
2544 // Opaque types with inner pointers shouldn't ever create new stack
2545 // variables, so we don't handle it and just assert that it doesn't
2547 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
2551 write!(w, "let mut local_{} = (", ident).unwrap();
2552 for (idx, elem) in t.elems.iter().enumerate() {
2553 let real_elem = generics.resolve_type(&elem);
2554 let ty_has_inner = {
2556 // "To C ptr_for_ref" means "return the regular object with
2557 // is_owned set to false", which is totally what we want
2558 // if we're about to set ty_has_inner.
2561 if let syn::Type::Reference(t) = real_elem {
2562 if let syn::Type::Path(p) = &*t.elem {
2563 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2565 } else if let syn::Type::Path(p) = real_elem {
2566 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2569 if idx != 0 { write!(w, ", ").unwrap(); }
2570 var_prefix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2571 if is_ref && ty_has_inner {
2572 // For ty_has_inner, the regular var_prefix mapping will take a
2573 // reference, so deref once here to make sure we keep the original ref.
2574 write!(w, "*").unwrap();
2576 write!(w, "orig_{}_{}", ident, idx).unwrap();
2577 if is_ref && !ty_has_inner {
2578 // If we don't have an inner variable's reference to maintain, just
2579 // hope the type is Clonable and use that.
2580 write!(w, ".clone()").unwrap();
2582 var_suffix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2584 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2588 _ => unimplemented!(),
2592 pub fn write_to_c_conversion_new_var_inner<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, var_access: &str, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool, from_ownable_ref: bool) -> bool {
2593 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, from_ownable_ref, ptr_for_ref, true, from_ownable_ref,
2594 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2595 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2596 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2597 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2598 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2600 pub fn write_to_c_conversion_new_var<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) -> bool {
2601 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref, false)
2603 /// Prints new-var conversion for an "ownable_ref" type, ie prints conversion for
2604 /// `create_ownable_reference(t)`, not `t` itself.
2605 pub fn write_to_c_conversion_from_ownable_ref_new_var<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2606 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, true, true)
2608 pub fn write_from_c_conversion_new_var<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2609 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false, false,
2610 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2611 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2612 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2613 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2614 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2617 // ******************************************************
2618 // *** C Container Type Equivalent and alias Printing ***
2619 // ******************************************************
2621 fn write_template_generics<'b, W: std::io::Write>(&self, w: &mut W, args: &mut dyn Iterator<Item=&'b syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2622 for (idx, orig_t) in args.enumerate() {
2624 write!(w, ", ").unwrap();
2626 let t = generics.resolve_type(orig_t);
2627 if let syn::Type::Reference(r_arg) = t {
2628 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2630 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false, true, true) { return false; }
2632 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2633 // reference to something stupid, so check that the container is either opaque or a
2634 // predefined type (currently only Transaction).
2635 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2636 let resolved = self.resolve_path(&p_arg.path, generics);
2637 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2638 self.crate_types.traits.get(&resolved).is_some() ||
2639 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2640 } else { unimplemented!(); }
2641 } else if let syn::Type::Path(p_arg) = t {
2642 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2643 if !self.is_primitive(&resolved) {
2644 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2647 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2649 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2651 // We don't currently support outer reference types for non-primitive inners,
2652 // except for the empty tuple.
2653 if let syn::Type::Tuple(t_arg) = t {
2654 assert!(t_arg.elems.len() == 0 || !is_ref);
2658 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2663 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2664 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2665 let mut created_container: Vec<u8> = Vec::new();
2667 if container_type == "Result" {
2668 let mut a_ty: Vec<u8> = Vec::new();
2669 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2670 if tup.elems.is_empty() {
2671 write!(&mut a_ty, "()").unwrap();
2673 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2676 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2679 let mut b_ty: Vec<u8> = Vec::new();
2680 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2681 if tup.elems.is_empty() {
2682 write!(&mut b_ty, "()").unwrap();
2684 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2687 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2690 let ok_str = String::from_utf8(a_ty).unwrap();
2691 let err_str = String::from_utf8(b_ty).unwrap();
2692 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2693 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2695 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2697 } else if container_type == "Vec" {
2698 let mut a_ty: Vec<u8> = Vec::new();
2699 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2700 let ty = String::from_utf8(a_ty).unwrap();
2701 let is_clonable = self.is_clonable(&ty);
2702 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2704 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2706 } else if container_type.ends_with("Tuple") {
2707 let mut tuple_args = Vec::new();
2708 let mut is_clonable = true;
2709 for arg in args.iter() {
2710 let mut ty: Vec<u8> = Vec::new();
2711 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2712 let ty_str = String::from_utf8(ty).unwrap();
2713 if !self.is_clonable(&ty_str) {
2714 is_clonable = false;
2716 tuple_args.push(ty_str);
2718 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2720 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2722 } else if container_type == "Option" {
2723 let mut a_ty: Vec<u8> = Vec::new();
2724 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2725 let ty = String::from_utf8(a_ty).unwrap();
2726 let is_clonable = self.is_clonable(&ty);
2727 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2729 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2734 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2738 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2739 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2740 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2741 } else { unimplemented!(); }
2743 fn write_c_mangled_container_path_intern<W: std::io::Write>
2744 (&self, w: &mut W, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, ident: &str, is_ref: bool, is_mut: bool, ptr_for_ref: bool, in_type: bool) -> bool {
2745 let mut mangled_type: Vec<u8> = Vec::new();
2746 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2747 write!(w, "C{}_", ident).unwrap();
2748 write!(mangled_type, "C{}_", ident).unwrap();
2749 } else { assert_eq!(args.len(), 1); }
2750 for arg in args.iter() {
2751 macro_rules! write_path {
2752 ($p_arg: expr, $extra_write: expr) => {
2753 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2754 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2756 if self.c_type_has_inner_from_path(&subtype) {
2757 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref, false, true) { return false; }
2759 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2760 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false, false, true) { return false; }
2762 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2763 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true, false, true) { return false; }
2767 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2769 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2770 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2771 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2774 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2775 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2776 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2777 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2778 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2781 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2782 write!(w, "{}", id).unwrap();
2783 write!(mangled_type, "{}", id).unwrap();
2784 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2785 write!(w2, "{}", id).unwrap();
2788 } else { return false; }
2791 match generics.resolve_type(arg) {
2792 syn::Type::Tuple(tuple) => {
2793 if tuple.elems.len() == 0 {
2794 write!(w, "None").unwrap();
2795 write!(mangled_type, "None").unwrap();
2797 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2799 // Figure out what the mangled type should look like. To disambiguate
2800 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2801 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2802 // available for use in type names.
2803 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2804 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2805 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2806 for elem in tuple.elems.iter() {
2807 if let syn::Type::Path(p) = elem {
2808 write_path!(p, Some(&mut mangled_tuple_type));
2809 } else if let syn::Type::Reference(refelem) = elem {
2810 if let syn::Type::Path(p) = &*refelem.elem {
2811 write_path!(p, Some(&mut mangled_tuple_type));
2812 } else { return false; }
2813 } else { return false; }
2815 write!(w, "Z").unwrap();
2816 write!(mangled_type, "Z").unwrap();
2817 write!(mangled_tuple_type, "Z").unwrap();
2818 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2819 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2824 syn::Type::Path(p_arg) => {
2825 write_path!(p_arg, None);
2827 syn::Type::Reference(refty) => {
2828 if let syn::Type::Path(p_arg) = &*refty.elem {
2829 write_path!(p_arg, None);
2830 } else if let syn::Type::Slice(_) = &*refty.elem {
2831 // write_c_type will actually do exactly what we want here, we just need to
2832 // make it a pointer so that its an option. Note that we cannot always convert
2833 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2834 // to edit it, hence we use *mut here instead of *const.
2835 if args.len() != 1 { return false; }
2836 write!(w, "*mut ").unwrap();
2837 self.write_c_type(w, arg, None, true);
2838 } else { return false; }
2840 syn::Type::Array(a) => {
2841 if let syn::Type::Path(p_arg) = &*a.elem {
2842 let resolved = self.resolve_path(&p_arg.path, generics);
2843 if !self.is_primitive(&resolved) { return false; }
2844 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2845 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2846 if in_type || args.len() != 1 {
2847 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2848 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2850 let arrty = format!("[{}; {}]", resolved, len.base10_digits());
2851 let realty = self.c_type_from_path(&arrty, is_ref, ptr_for_ref).unwrap_or(&arrty);
2852 write!(w, "{}", realty).unwrap();
2853 write!(mangled_type, "{}", realty).unwrap();
2855 } else { return false; }
2856 } else { return false; }
2858 _ => { return false; },
2861 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) { return true; }
2862 // Push the "end of type" Z
2863 write!(w, "Z").unwrap();
2864 write!(mangled_type, "Z").unwrap();
2866 // Make sure the type is actually defined:
2867 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2869 fn write_c_mangled_container_path<W: std::io::Write>(&self, w: &mut W, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, ident: &str, is_ref: bool, is_mut: bool, ptr_for_ref: bool) -> bool {
2870 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2871 write!(w, "{}::", Self::generated_container_path()).unwrap();
2873 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2875 pub fn get_c_mangled_container_type(&self, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, template_name: &str) -> Option<String> {
2876 let mut out = Vec::new();
2877 if !self.write_c_mangled_container_path(&mut out, args, generics, template_name, false, false, false) {
2880 Some(String::from_utf8(out).unwrap())
2883 // **********************************
2884 // *** C Type Equivalent Printing ***
2885 // **********************************
2887 fn write_c_path_intern<W: std::io::Write>(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool, c_ty: bool) -> bool {
2888 let full_path = match self.maybe_resolve_path(&path, generics) {
2889 Some(path) => path, None => return false };
2890 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2891 write!(w, "{}", c_type).unwrap();
2893 } else if self.crate_types.traits.get(&full_path).is_some() {
2894 // Note that we always use the crate:: prefix here as we are always referring to a
2895 // concrete object which is of the generated type, it just implements the upstream
2897 if is_ref && ptr_for_ref {
2898 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2900 if with_ref_lifetime { unimplemented!(); }
2901 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2903 write!(w, "crate::{}", full_path).unwrap();
2906 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2907 let crate_pfx = if c_ty { "crate::" } else { "" };
2908 if is_ref && ptr_for_ref {
2909 // ptr_for_ref implies we're returning the object, which we can't really do for
2910 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2911 // the actual object itself (for opaque types we'll set the pointer to the actual
2912 // type and note that its a reference).
2913 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2914 } else if is_ref && with_ref_lifetime {
2916 // If we're concretizing something with a lifetime parameter, we have to pick a
2917 // lifetime, of which the only real available choice is `static`, obviously.
2918 write!(w, "&'static {}", crate_pfx).unwrap();
2920 self.write_rust_path(w, generics, path, with_ref_lifetime, false);
2922 // We shouldn't be mapping references in types, so panic here
2926 write!(w, "&{}{}{}", if is_mut { "mut " } else { "" }, crate_pfx, full_path).unwrap();
2928 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2935 fn write_c_type_intern<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool, c_ty: bool) -> bool {
2936 match generics.resolve_type(t) {
2937 syn::Type::Path(p) => {
2938 if p.qself.is_some() {
2941 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2942 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2943 return self.write_c_mangled_container_path(w, Self::path_to_generic_args(&p.path), generics, &full_path, is_ref, is_mut, ptr_for_ref);
2945 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2946 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty);
2949 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty)
2951 syn::Type::Reference(r) => {
2952 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref, with_ref_lifetime, c_ty)
2954 syn::Type::Array(a) => {
2955 if is_ref && is_mut {
2956 write!(w, "*mut [").unwrap();
2957 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2959 write!(w, "*const [").unwrap();
2960 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2962 let mut typecheck = Vec::new();
2963 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2964 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2966 if let syn::Expr::Lit(l) = &a.len {
2967 if let syn::Lit::Int(i) = &l.lit {
2969 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2970 write!(w, "{}", ty).unwrap();
2974 write!(w, "; {}]", i).unwrap();
2980 syn::Type::Slice(s) => {
2981 if !is_ref || is_mut { return false; }
2982 if let syn::Type::Path(p) = &*s.elem {
2983 let resolved = self.resolve_path(&p.path, generics);
2984 if self.is_primitive(&resolved) {
2985 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2988 let mut inner_c_ty = Vec::new();
2989 assert!(self.write_c_path_intern(&mut inner_c_ty, &p.path, generics, true, false, ptr_for_ref, with_ref_lifetime, c_ty));
2990 let inner_ty_str = String::from_utf8(inner_c_ty).unwrap();
2991 if self.is_clonable(&inner_ty_str) {
2992 let inner_ty_ident = inner_ty_str.rsplitn(2, "::").next().unwrap();
2993 let mangled_container = format!("CVec_{}Z", inner_ty_ident);
2994 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2995 self.check_create_container(mangled_container, "Vec", vec![&*s.elem], generics, false)
2998 } else if let syn::Type::Reference(r) = &*s.elem {
2999 if let syn::Type::Path(p) = &*r.elem {
3000 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
3001 let resolved = self.resolve_path(&p.path, generics);
3002 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
3003 format!("CVec_{}Z", ident)
3004 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
3005 format!("CVec_{}Z", en.ident)
3006 } else if let Some(id) = p.path.get_ident() {
3007 format!("CVec_{}Z", id)
3008 } else { return false; };
3009 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
3010 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
3011 } else if let syn::Type::Slice(sl2) = &*r.elem {
3012 if let syn::Type::Reference(r2) = &*sl2.elem {
3013 if let syn::Type::Path(p) = &*r2.elem {
3014 // Slices with slices with opaque types (with is_owned flags) are mapped as non-ref Vecs
3015 let resolved = self.resolve_path(&p.path, generics);
3016 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
3017 format!("CVec_CVec_{}ZZ", ident)
3018 } else { return false; };
3019 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
3020 let inner = &r2.elem;
3021 let vec_ty: syn::Type = syn::parse_quote!(Vec<#inner>);
3022 self.check_create_container(mangled_container, "Vec", vec![&vec_ty], generics, false)
3026 } else if let syn::Type::Tuple(_) = &*s.elem {
3027 let mut args = syn::punctuated::Punctuated::<_, syn::token::Comma>::new();
3028 args.push(syn::GenericArgument::Type((*s.elem).clone()));
3029 let mut segments = syn::punctuated::Punctuated::new();
3030 segments.push(parse_quote!(Vec<#args>));
3031 self.write_c_type_intern(w, &syn::Type::Path(syn::TypePath { qself: None, path: syn::Path { leading_colon: None, segments } }), generics, false, is_mut, ptr_for_ref, with_ref_lifetime, c_ty)
3032 } else if let syn::Type::Array(a) = &*s.elem {
3033 if let syn::Expr::Lit(l) = &a.len {
3034 if let syn::Lit::Int(i) = &l.lit {
3035 let mut buf = Vec::new();
3036 self.write_rust_type(&mut buf, generics, &*a.elem, false);
3037 let arr_ty = String::from_utf8(buf).unwrap();
3039 let arr_str = format!("[{}; {}]", arr_ty, i.base10_digits());
3040 let ty = self.c_type_from_path(&arr_str, false, ptr_for_ref).unwrap()
3041 .rsplitn(2, "::").next().unwrap();
3043 let mangled_container = format!("CVec_{}Z", ty);
3044 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
3045 self.check_create_container(mangled_container, "Vec", vec![&*s.elem], generics, false)
3050 syn::Type::Tuple(t) => {
3051 if t.elems.len() == 0 {
3054 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
3055 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
3061 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
3062 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, false, true));
3064 pub fn write_c_type_in_generic_param<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
3065 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, true, false));
3067 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
3068 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false, false, true)
3070 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
3071 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false, false, true)