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() || bound.lifetimes.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)>,
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<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
209 let mut new_typed_generics = HashMap::new();
210 // First learn simple generics...
211 for generic in generics.params.iter() {
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 new_typed_generics.insert(&type_param.ident, Some(path));
230 } else if trait_bound.path.segments.len() == 1 {
231 // If we're templated on Deref<Target = ConcreteThing>, store
232 // the reference type in `default_generics` which handles full
233 // types and not just paths.
234 if let syn::PathArguments::AngleBracketed(ref args) =
235 trait_bound.path.segments[0].arguments {
236 for subargument in args.args.iter() {
238 syn::GenericArgument::Lifetime(_) => {},
239 syn::GenericArgument::Binding(ref b) => {
240 if &format!("{}", b.ident) != "Target" { return false; }
242 self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default)));
245 _ => unimplemented!(),
249 new_typed_generics.insert(&type_param.ident, None);
255 if let Some(default) = type_param.default.as_ref() {
256 assert!(type_param.bounds.is_empty());
257 self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default)));
263 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
264 if let Some(wh) = &generics.where_clause {
265 for pred in wh.predicates.iter() {
266 if let syn::WherePredicate::Type(t) = pred {
267 if let syn::Type::Path(p) = &t.bounded_ty {
268 if p.qself.is_some() { return false; }
269 if p.path.leading_colon.is_some() { return false; }
270 let mut p_iter = p.path.segments.iter();
271 let p_ident = &p_iter.next().unwrap().ident;
272 if let Some(gen) = new_typed_generics.get_mut(p_ident) {
273 if gen.is_some() { return false; }
274 if &format!("{}", p_iter.next().unwrap().ident) != "Target" {return false; }
276 let mut non_lifetimes_processed = false;
277 for bound in t.bounds.iter() {
278 if let syn::TypeParamBound::Trait(trait_bound) = bound {
279 if let Some(id) = trait_bound.path.get_ident() {
280 if format!("{}", id) == "Sized" { continue; }
282 if non_lifetimes_processed { return false; }
283 non_lifetimes_processed = true;
284 assert_simple_bound(&trait_bound);
285 let resolved = types.resolve_path(&trait_bound.path, None);
286 let ty = syn::Type::Path(syn::TypePath {
287 qself: None, path: string_path_to_syn_path(&resolved)
289 let ref_ty = parse_quote!(&#ty);
290 self.default_generics.insert(p_ident, (ty, ref_ty));
292 *gen = Some(resolved);
295 } else { return false; }
296 } else { return false; }
300 for (key, value) in new_typed_generics.drain() {
301 if let Some(v) = value {
302 assert!(self.typed_generics.insert(key, v).is_none());
303 } else { return false; }
308 /// Learn the associated types from the trait in the current context.
309 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
310 for item in t.items.iter() {
312 &syn::TraitItem::Type(ref t) => {
313 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
314 let mut bounds_iter = t.bounds.iter();
316 match bounds_iter.next().unwrap() {
317 syn::TypeParamBound::Trait(tr) => {
318 assert_simple_bound(&tr);
319 if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
320 if types.skip_path(&path) { continue; }
321 // In general we handle Deref<Target=X> as if it were just X (and
322 // implement Deref<Target=Self> for relevant types). We don't
323 // bother to implement it for associated types, however, so we just
324 // ignore such bounds.
325 if path != "std::ops::Deref" && path != "core::ops::Deref" {
326 self.typed_generics.insert(&t.ident, path);
328 } else { unimplemented!(); }
329 for bound in bounds_iter {
330 if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
334 syn::TypeParamBound::Lifetime(_) => {},
343 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
345 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<&'b String> {
346 if let Some(ident) = path.get_ident() {
347 if let Some(ty) = &self.self_ty {
348 if format!("{}", ident) == "Self" {
352 if let Some(res) = self.typed_generics.get(ident) {
356 // Associated types are usually specified as "Self::Generic", so we check for that
358 let mut it = path.segments.iter();
359 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
360 let ident = &it.next().unwrap().ident;
361 if let Some(res) = self.typed_generics.get(ident) {
366 if let Some(parent) = self.parent {
367 parent.maybe_resolve_path(path)
374 pub trait ResolveType<'a> { fn resolve_type(&'a self, ty: &'a syn::Type) -> &'a syn::Type; }
375 impl<'a, 'b, 'c: 'a + 'b> ResolveType<'c> for Option<&GenericTypes<'a, 'b>> {
376 fn resolve_type(&'c self, ty: &'c syn::Type) -> &'c syn::Type {
377 if let Some(us) = self {
379 syn::Type::Path(p) => {
380 if let Some(ident) = p.path.get_ident() {
381 if let Some((ty, _)) = us.default_generics.get(ident) {
386 syn::Type::Reference(syn::TypeReference { elem, .. }) => {
387 if let syn::Type::Path(p) = &**elem {
388 if let Some(ident) = p.path.get_ident() {
389 if let Some((_, refty)) = us.default_generics.get(ident) {
397 us.parent.resolve_type(ty)
402 #[derive(Clone, PartialEq)]
403 // The type of declaration and the object itself
404 pub enum DeclType<'a> {
406 Trait(&'a syn::ItemTrait),
407 StructImported { generics: &'a syn::Generics },
409 EnumIgnored { generics: &'a syn::Generics },
412 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
413 pub crate_name: &'mod_lifetime str,
414 dependencies: &'mod_lifetime HashSet<syn::Ident>,
415 module_path: &'mod_lifetime str,
416 imports: HashMap<syn::Ident, (String, syn::Path)>,
417 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
418 priv_modules: HashSet<syn::Ident>,
420 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
421 fn process_use_intern(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>,
422 u: &syn::UseTree, partial_path: &str, mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>) {
425 macro_rules! push_path {
426 ($ident: expr, $path_suffix: expr) => {
427 if partial_path == "" && format!("{}", $ident) == "super" {
428 let mut mod_iter = module_path.rsplitn(2, "::");
429 mod_iter.next().unwrap();
430 let super_mod = mod_iter.next().unwrap();
431 new_path = format!("{}{}", super_mod, $path_suffix);
432 assert_eq!(path.len(), 0);
433 for module in super_mod.split("::") {
434 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
436 } else if partial_path == "" && format!("{}", $ident) == "self" {
437 new_path = format!("{}{}", module_path, $path_suffix);
438 for module in module_path.split("::") {
439 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
441 } else if partial_path == "" && format!("{}", $ident) == "crate" {
442 new_path = format!("{}{}", crate_name, $path_suffix);
443 let crate_name_ident = format_ident!("{}", crate_name);
444 path.push(parse_quote!(#crate_name_ident));
445 } else if partial_path == "" && !dependencies.contains(&$ident) {
446 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
447 let crate_name_ident = format_ident!("{}", crate_name);
448 path.push(parse_quote!(#crate_name_ident));
449 } else if format!("{}", $ident) == "self" {
450 let mut path_iter = partial_path.rsplitn(2, "::");
451 path_iter.next().unwrap();
452 new_path = path_iter.next().unwrap().to_owned();
454 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
457 path.push(parse_quote!(#ident));
461 syn::UseTree::Path(p) => {
462 push_path!(p.ident, "::");
463 Self::process_use_intern(crate_name, module_path, dependencies, imports, &p.tree, &new_path, path);
465 syn::UseTree::Name(n) => {
466 push_path!(n.ident, "");
467 let imported_ident = syn::Ident::new(new_path.rsplitn(2, "::").next().unwrap(), Span::call_site());
468 imports.insert(imported_ident, (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
470 syn::UseTree::Group(g) => {
471 for i in g.items.iter() {
472 Self::process_use_intern(crate_name, module_path, dependencies, imports, i, partial_path, path.clone());
475 syn::UseTree::Rename(r) => {
476 push_path!(r.ident, "");
477 imports.insert(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
479 syn::UseTree::Glob(_) => {
480 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
485 fn process_use(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
486 if let syn::Visibility::Public(_) = u.vis {
487 // We actually only use these for #[cfg(fuzztarget)]
488 eprintln!("Ignoring pub(use) tree!");
491 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
492 Self::process_use_intern(crate_name, module_path, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
495 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
496 let ident = format_ident!("{}", id);
497 let path = parse_quote!(#ident);
498 imports.insert(ident, (id.to_owned(), path));
501 pub fn new(crate_name: &'mod_lifetime str, dependencies: &'mod_lifetime HashSet<syn::Ident>, module_path: &'mod_lifetime str, contents: &'crate_lft [syn::Item]) -> Self {
502 Self::from_borrowed_items(crate_name, dependencies, module_path, &contents.iter().map(|a| a).collect::<Vec<_>>())
504 pub fn from_borrowed_items(crate_name: &'mod_lifetime str, dependencies: &'mod_lifetime HashSet<syn::Ident>, module_path: &'mod_lifetime str, contents: &[&'crate_lft syn::Item]) -> Self {
505 let mut imports = HashMap::new();
506 // Add primitives to the "imports" list:
507 Self::insert_primitive(&mut imports, "bool");
508 Self::insert_primitive(&mut imports, "u64");
509 Self::insert_primitive(&mut imports, "u32");
510 Self::insert_primitive(&mut imports, "u16");
511 Self::insert_primitive(&mut imports, "u8");
512 Self::insert_primitive(&mut imports, "usize");
513 Self::insert_primitive(&mut imports, "str");
514 Self::insert_primitive(&mut imports, "String");
516 // These are here to allow us to print native Rust types in trait fn impls even if we don't
518 Self::insert_primitive(&mut imports, "Result");
519 Self::insert_primitive(&mut imports, "Vec");
520 Self::insert_primitive(&mut imports, "Option");
522 let mut declared = HashMap::new();
523 let mut priv_modules = HashSet::new();
525 for item in contents.iter() {
527 syn::Item::Use(u) => Self::process_use(crate_name, module_path, dependencies, &mut imports, &u),
528 syn::Item::Struct(s) => {
529 if let syn::Visibility::Public(_) = s.vis {
530 match export_status(&s.attrs) {
531 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported { generics: &s.generics }); },
532 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
533 ExportStatus::TestOnly => continue,
534 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
538 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
539 if let syn::Visibility::Public(_) = t.vis {
540 declared.insert(t.ident.clone(), DeclType::StructImported { generics: &t.generics });
543 syn::Item::Enum(e) => {
544 if let syn::Visibility::Public(_) = e.vis {
545 match export_status(&e.attrs) {
546 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored { generics: &e.generics }); },
547 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
548 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
553 syn::Item::Trait(t) => {
554 match export_status(&t.attrs) {
555 ExportStatus::Export|ExportStatus::NotImplementable => {
556 if let syn::Visibility::Public(_) = t.vis {
557 declared.insert(t.ident.clone(), DeclType::Trait(t));
563 syn::Item::Mod(m) => {
564 priv_modules.insert(m.ident.clone());
570 Self { crate_name, dependencies, module_path, imports, declared, priv_modules }
573 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
574 self.declared.get(id)
577 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
578 if let Some((imp, _)) = self.imports.get(id) {
580 } else if self.declared.get(id).is_some() {
581 Some(self.module_path.to_string() + "::" + &format!("{}", id))
585 pub fn maybe_resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
586 if let Some(gen_types) = generics {
587 if let Some(resp) = gen_types.maybe_resolve_path(p) {
588 return Some(resp.clone());
592 if p.leading_colon.is_some() {
593 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
594 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
596 let firstseg = p.segments.iter().next().unwrap();
597 if !self.dependencies.contains(&firstseg.ident) {
598 res = self.crate_name.to_owned() + "::" + &res;
601 } else if let Some(id) = p.get_ident() {
602 self.maybe_resolve_ident(id)
604 if p.segments.len() == 1 {
605 let seg = p.segments.iter().next().unwrap();
606 return self.maybe_resolve_ident(&seg.ident);
608 let mut seg_iter = p.segments.iter();
609 let first_seg = seg_iter.next().unwrap();
610 let remaining: String = seg_iter.map(|seg| {
611 format!("::{}", seg.ident)
613 let first_seg_str = format!("{}", first_seg.ident);
614 if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
616 Some(imp.clone() + &remaining)
620 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
621 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
622 } else if first_seg_is_stdlib(&first_seg_str) || self.dependencies.contains(&first_seg.ident) {
623 Some(first_seg_str + &remaining)
628 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
629 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
631 syn::Type::Path(p) => {
632 if p.path.segments.len() != 1 { unimplemented!(); }
633 let mut args = p.path.segments[0].arguments.clone();
634 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
635 for arg in generics.args.iter_mut() {
636 if let syn::GenericArgument::Type(ref mut t) = arg {
637 *t = self.resolve_imported_refs(t.clone());
641 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
642 p.path = newpath.clone();
644 p.path.segments[0].arguments = args;
646 syn::Type::Reference(r) => {
647 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
649 syn::Type::Slice(s) => {
650 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
652 syn::Type::Tuple(t) => {
653 for e in t.elems.iter_mut() {
654 *e = self.resolve_imported_refs(e.clone());
657 _ => unimplemented!(),
663 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
664 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
665 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
666 // accomplish the same goals, so we just ignore it.
668 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
671 pub struct ASTModule {
672 pub attrs: Vec<syn::Attribute>,
673 pub items: Vec<syn::Item>,
674 pub submods: Vec<String>,
676 /// A struct containing the syn::File AST for each file in the crate.
677 pub struct FullLibraryAST {
678 pub modules: HashMap<String, ASTModule, NonRandomHash>,
679 pub dependencies: HashSet<syn::Ident>,
681 impl FullLibraryAST {
682 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
683 let mut non_mod_items = Vec::with_capacity(items.len());
684 let mut submods = Vec::with_capacity(items.len());
685 for item in items.drain(..) {
687 syn::Item::Mod(m) if m.content.is_some() => {
688 if export_status(&m.attrs) == ExportStatus::Export {
689 if let syn::Visibility::Public(_) = m.vis {
690 let modident = format!("{}", m.ident);
691 let modname = if module != "" {
692 module.clone() + "::" + &modident
696 self.load_module(modname, m.attrs, m.content.unwrap().1);
697 submods.push(modident);
699 non_mod_items.push(syn::Item::Mod(m));
703 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
704 syn::Item::ExternCrate(c) => {
705 if export_status(&c.attrs) == ExportStatus::Export {
706 self.dependencies.insert(c.ident);
709 _ => { non_mod_items.push(item); }
712 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
715 pub fn load_lib(lib: syn::File) -> Self {
716 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
717 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
718 res.load_module("".to_owned(), lib.attrs, lib.items);
723 /// List of manually-generated types which are clonable
724 fn initial_clonable_types() -> HashSet<String> {
725 let mut res = HashSet::new();
726 res.insert("crate::c_types::u5".to_owned());
727 res.insert("crate::c_types::FourBytes".to_owned());
728 res.insert("crate::c_types::TwelveBytes".to_owned());
729 res.insert("crate::c_types::SixteenBytes".to_owned());
730 res.insert("crate::c_types::TwentyBytes".to_owned());
731 res.insert("crate::c_types::ThirtyTwoBytes".to_owned());
732 res.insert("crate::c_types::SecretKey".to_owned());
733 res.insert("crate::c_types::PublicKey".to_owned());
734 res.insert("crate::c_types::Transaction".to_owned());
735 res.insert("crate::c_types::TxOut".to_owned());
736 res.insert("crate::c_types::Signature".to_owned());
737 res.insert("crate::c_types::RecoverableSignature".to_owned());
738 res.insert("crate::c_types::Bech32Error".to_owned());
739 res.insert("crate::c_types::Secp256k1Error".to_owned());
740 res.insert("crate::c_types::IOError".to_owned());
741 res.insert("crate::c_types::Error".to_owned());
742 res.insert("crate::c_types::Str".to_owned());
744 // Because some types are manually-mapped to CVec_u8Z we may end up checking if its clonable
745 // before we ever get to constructing the type fully via
746 // `write_c_mangled_container_path_intern` (which will add it here too), so we have to manually
747 // add it on startup.
748 res.insert("crate::c_types::derived::CVec_u8Z".to_owned());
752 /// Top-level struct tracking everything which has been defined while walking the crate.
753 pub struct CrateTypes<'a> {
754 /// This may contain structs or enums, but only when either is mapped as
755 /// struct X { inner: *mut originalX, .. }
756 pub opaques: HashMap<String, (&'a syn::Ident, &'a syn::Generics)>,
757 /// structs that weren't exposed
758 pub priv_structs: HashMap<String, &'a syn::Generics>,
759 /// Enums which are mapped as C enums with conversion functions
760 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
761 /// Traits which are mapped as a pointer + jump table
762 pub traits: HashMap<String, &'a syn::ItemTrait>,
763 /// Aliases from paths to some other Type
764 pub type_aliases: HashMap<String, syn::Type>,
765 /// Value is an alias to Key (maybe with some generics)
766 pub reverse_alias_map: HashMap<String, Vec<(String, syn::PathArguments)>>,
767 /// Template continer types defined, map from mangled type name -> whether a destructor fn
770 /// This is used at the end of processing to make C++ wrapper classes
771 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
772 /// The output file for any created template container types, written to as we find new
773 /// template containers which need to be defined.
774 template_file: RefCell<&'a mut File>,
775 /// Set of containers which are clonable
776 clonable_types: RefCell<HashSet<String>>,
778 pub trait_impls: HashMap<String, Vec<String>>,
779 /// The full set of modules in the crate(s)
780 pub lib_ast: &'a FullLibraryAST,
783 impl<'a> CrateTypes<'a> {
784 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
786 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
787 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
788 templates_defined: RefCell::new(HashMap::default()), priv_structs: HashMap::new(),
789 clonable_types: RefCell::new(initial_clonable_types()), trait_impls: HashMap::new(),
790 template_file: RefCell::new(template_file), lib_ast: &libast,
793 pub fn set_clonable(&self, object: String) {
794 self.clonable_types.borrow_mut().insert(object);
796 pub fn is_clonable(&self, object: &str) -> bool {
797 self.clonable_types.borrow().contains(object)
799 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
800 self.template_file.borrow_mut().write(created_container).unwrap();
801 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
805 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
806 /// module but contains a reference to the overall CrateTypes tracking.
807 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
808 pub module_path: &'mod_lifetime str,
809 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
810 pub types: ImportResolver<'mod_lifetime, 'crate_lft>,
813 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
814 /// happen to get the inner value of a generic.
815 enum EmptyValExpectedTy {
816 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
818 /// A Option mapped as a COption_*Z
820 /// A pointer which we want to convert to a reference.
825 /// Describes the appropriate place to print a general type-conversion string when converting a
827 enum ContainerPrefixLocation {
828 /// Prints a general type-conversion string prefix and suffix outside of the
829 /// container-conversion strings.
831 /// Prints a general type-conversion string prefix and suffix inside of the
832 /// container-conversion strings.
834 /// Does not print the usual type-conversion string prefix and suffix.
838 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
839 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
840 Self { module_path, types, crate_types }
843 // *************************************************
844 // *** Well know type and conversion definitions ***
845 // *************************************************
847 /// Returns true we if can just skip passing this to C entirely
848 pub fn skip_path(&self, full_path: &str) -> bool {
849 full_path == "bitcoin::secp256k1::Secp256k1" ||
850 full_path == "bitcoin::secp256k1::Signing" ||
851 full_path == "bitcoin::secp256k1::Verification"
853 /// Returns true we if can just skip passing this to C entirely
854 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
855 if full_path == "bitcoin::secp256k1::Secp256k1" {
856 "secp256k1::global::SECP256K1"
857 } else { unimplemented!(); }
860 /// Returns true if the object is a primitive and is mapped as-is with no conversion
862 pub fn is_primitive(&self, full_path: &str) -> bool {
873 pub fn is_clonable(&self, ty: &str) -> bool {
874 if self.crate_types.is_clonable(ty) { return true; }
875 if self.is_primitive(ty) { return true; }
881 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
882 /// ignored by for some reason need mapping anyway.
883 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
884 if self.is_primitive(full_path) {
885 return Some(full_path);
888 // Note that no !is_ref types can map to an array because Rust and C's call semantics
889 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
891 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
892 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes"),
893 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
894 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes"),
895 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
896 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
898 "str" if is_ref => Some("crate::c_types::Str"),
899 "alloc::string::String"|"String" => Some("crate::c_types::Str"),
901 "std::time::Duration"|"core::time::Duration" => Some("u64"),
902 "std::time::SystemTime" => Some("u64"),
903 "std::io::Error"|"lightning::io::Error" => Some("crate::c_types::IOError"),
904 "core::fmt::Arguments" if is_ref => Some("crate::c_types::Str"),
906 "core::convert::Infallible" => Some("crate::c_types::NotConstructable"),
908 "bitcoin::bech32::Error"|"bech32::Error"
909 if !is_ref => Some("crate::c_types::Bech32Error"),
910 "bitcoin::secp256k1::Error"|"secp256k1::Error"
911 if !is_ref => Some("crate::c_types::Secp256k1Error"),
913 "core::num::ParseIntError" => Some("crate::c_types::Error"),
914 "core::str::Utf8Error" => Some("crate::c_types::Error"),
916 "bitcoin::bech32::u5"|"bech32::u5" => Some("crate::c_types::u5"),
917 "core::num::NonZeroU8" => Some("u8"),
919 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some("crate::c_types::PublicKey"),
920 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature"),
921 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature"),
922 "bitcoin::secp256k1::SecretKey" if is_ref => Some("*const [u8; 32]"),
923 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey"),
924 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
925 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
926 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
927 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction"),
928 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
929 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
930 "bitcoin::util::address::WitnessVersion" => Some("crate::c_types::WitnessVersion"),
931 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
932 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
934 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|"bitcoin::hash_types::ScriptHash"
935 if is_ref => Some("*const [u8; 20]"),
936 "bitcoin::hash_types::WScriptHash"
937 if is_ref => Some("*const [u8; 32]"),
939 // Newtypes that we just expose in their original form.
940 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
941 if is_ref => Some("*const [u8; 32]"),
942 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
943 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
944 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
945 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
946 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
947 if is_ref => Some("*const [u8; 32]"),
948 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
949 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
950 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
952 "lightning::io::Read" => Some("crate::c_types::u8slice"),
958 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
961 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
962 if self.is_primitive(full_path) {
963 return Some("".to_owned());
966 "Vec" if !is_ref => Some("local_"),
967 "Result" if !is_ref => Some("local_"),
968 "Option" if is_ref => Some("&local_"),
969 "Option" => Some("local_"),
971 "[u8; 32]" if is_ref => Some("unsafe { &*"),
972 "[u8; 32]" if !is_ref => Some(""),
973 "[u8; 20]" if !is_ref => Some(""),
974 "[u8; 16]" if !is_ref => Some(""),
975 "[u8; 12]" if !is_ref => Some(""),
976 "[u8; 4]" if !is_ref => Some(""),
977 "[u8; 3]" if !is_ref => Some(""),
979 "[u8]" if is_ref => Some(""),
980 "[usize]" if is_ref => Some(""),
982 "str" if is_ref => Some(""),
983 "alloc::string::String"|"String" => Some(""),
984 "std::io::Error"|"lightning::io::Error" => Some(""),
985 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
986 // cannot create a &String.
988 "core::convert::Infallible" => Some("panic!(\"You must never construct a NotConstructable! : "),
990 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(""),
991 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(""),
993 "core::num::ParseIntError" => Some("u8::from_str_radix(\" a\", 10).unwrap_err() /*"),
994 "core::str::Utf8Error" => Some("core::str::from_utf8(&[0xff]).unwrap_err() /*"),
996 "std::time::Duration"|"core::time::Duration" => Some("core::time::Duration::from_secs("),
997 "std::time::SystemTime" => Some("(::std::time::SystemTime::UNIX_EPOCH + std::time::Duration::from_secs("),
999 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1000 "core::num::NonZeroU8" => Some("core::num::NonZeroU8::new("),
1002 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" if is_ref => Some("&"),
1003 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(""),
1004 "bitcoin::secp256k1::ecdsa::Signature" if is_ref => Some("&"),
1005 "bitcoin::secp256k1::ecdsa::Signature" => Some(""),
1006 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(""),
1007 "bitcoin::secp256k1::SecretKey" if is_ref => Some("&::bitcoin::secp256k1::SecretKey::from_slice(&unsafe { *"),
1008 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(""),
1009 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
1010 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
1011 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("&"),
1012 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(""),
1013 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::C_to_bitcoin_outpoint("),
1014 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
1015 "bitcoin::network::constants::Network" => Some(""),
1016 "bitcoin::util::address::WitnessVersion" => Some(""),
1017 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
1018 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
1020 "bitcoin::hash_types::PubkeyHash" if is_ref =>
1021 Some("&bitcoin::hash_types::PubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1022 "bitcoin::hash_types::WPubkeyHash" if is_ref =>
1023 Some("&bitcoin::hash_types::WPubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1024 "bitcoin::hash_types::ScriptHash" if is_ref =>
1025 Some("&bitcoin::hash_types::ScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1026 "bitcoin::hash_types::WScriptHash" if is_ref =>
1027 Some("&bitcoin::hash_types::WScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1029 // Newtypes that we just expose in their original form.
1030 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
1031 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
1032 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
1033 "lightning::ln::PaymentHash" if !is_ref => Some("::lightning::ln::PaymentHash("),
1034 "lightning::ln::PaymentHash" if is_ref => Some("&::lightning::ln::PaymentHash(unsafe { *"),
1035 "lightning::ln::PaymentPreimage" if !is_ref => Some("::lightning::ln::PaymentPreimage("),
1036 "lightning::ln::PaymentPreimage" if is_ref => Some("&::lightning::ln::PaymentPreimage(unsafe { *"),
1037 "lightning::ln::PaymentSecret" if !is_ref => Some("::lightning::ln::PaymentSecret("),
1038 "lightning::ln::channelmanager::PaymentId" if !is_ref => Some("::lightning::ln::channelmanager::PaymentId("),
1039 "lightning::ln::channelmanager::PaymentId" if is_ref=> Some("&::lightning::ln::channelmanager::PaymentId( unsafe { *"),
1040 "lightning::chain::keysinterface::KeyMaterial" if !is_ref => Some("::lightning::chain::keysinterface::KeyMaterial("),
1041 "lightning::chain::keysinterface::KeyMaterial" if is_ref=> Some("&::lightning::chain::keysinterface::KeyMaterial( unsafe { *"),
1043 // List of traits we map (possibly during processing of other files):
1044 "lightning::io::Read" => Some("&mut "),
1047 }.map(|s| s.to_owned())
1049 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
1050 if self.is_primitive(full_path) {
1051 return Some("".to_owned());
1054 "Vec" if !is_ref => Some(""),
1055 "Option" => Some(""),
1056 "Result" if !is_ref => Some(""),
1058 "[u8; 32]" if is_ref => Some("}"),
1059 "[u8; 32]" if !is_ref => Some(".data"),
1060 "[u8; 20]" if !is_ref => Some(".data"),
1061 "[u8; 16]" if !is_ref => Some(".data"),
1062 "[u8; 12]" if !is_ref => Some(".data"),
1063 "[u8; 4]" if !is_ref => Some(".data"),
1064 "[u8; 3]" if !is_ref => Some(".data"),
1066 "[u8]" if is_ref => Some(".to_slice()"),
1067 "[usize]" if is_ref => Some(".to_slice()"),
1069 "str" if is_ref => Some(".into_str()"),
1070 "alloc::string::String"|"String" => Some(".into_string()"),
1071 "std::io::Error"|"lightning::io::Error" => Some(".to_rust()"),
1073 "core::convert::Infallible" => Some("\")"),
1075 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(".into_rust()"),
1076 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(".into_rust()"),
1078 "core::num::ParseIntError" => Some("*/"),
1079 "core::str::Utf8Error" => Some("*/"),
1081 "std::time::Duration"|"core::time::Duration" => Some(")"),
1082 "std::time::SystemTime" => Some("))"),
1084 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1085 "core::num::NonZeroU8" => Some(").expect(\"Value must be non-zero\")"),
1087 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(".into_rust()"),
1088 "bitcoin::secp256k1::ecdsa::Signature" => Some(".into_rust()"),
1089 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(".into_rust()"),
1090 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(".into_rust()"),
1091 "bitcoin::secp256k1::SecretKey" if is_ref => Some("}[..]).unwrap()"),
1092 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
1093 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
1094 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(".into_bitcoin()"),
1095 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1096 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
1097 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
1098 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1099 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
1100 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
1102 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|
1103 "bitcoin::hash_types::ScriptHash"|"bitcoin::hash_types::WScriptHash"
1104 if is_ref => Some(" }.clone()))"),
1106 // Newtypes that we just expose in their original form.
1107 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
1108 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
1109 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
1110 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1111 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1112 if !is_ref => Some(".data)"),
1113 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1114 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1115 if is_ref => Some(" })"),
1117 // List of traits we map (possibly during processing of other files):
1118 "lightning::io::Read" => Some(".to_reader()"),
1121 }.map(|s| s.to_owned())
1124 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
1125 if self.is_primitive(full_path) {
1129 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
1130 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
1132 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
1133 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
1134 "bitcoin::hash_types::Txid" => None,
1137 }.map(|s| s.to_owned())
1139 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1140 if self.is_primitive(full_path) {
1141 return Some("".to_owned());
1144 "Result" if !is_ref => Some("local_"),
1145 "Vec" if !is_ref => Some("local_"),
1146 "Option" => Some("local_"),
1148 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1149 "[u8; 32]" if is_ref => Some(""),
1150 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes { data: "),
1151 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
1152 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes { data: "),
1153 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
1154 "[u8; 3]" if is_ref => Some(""),
1156 "[u8]" if is_ref => Some("local_"),
1157 "[usize]" if is_ref => Some("local_"),
1159 "str" if is_ref => Some(""),
1160 "alloc::string::String"|"String" => Some(""),
1162 "std::time::Duration"|"core::time::Duration" => Some(""),
1163 "std::time::SystemTime" => Some(""),
1164 "std::io::Error"|"lightning::io::Error" => Some("crate::c_types::IOError::from_rust("),
1165 "core::fmt::Arguments" => Some("alloc::format!(\"{}\", "),
1167 "core::convert::Infallible" => Some("panic!(\"Cannot construct an Infallible: "),
1169 "bitcoin::bech32::Error"|"bech32::Error"
1170 if !is_ref => Some("crate::c_types::Bech32Error::from_rust("),
1171 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1172 if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
1174 "core::num::ParseIntError" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1175 "core::str::Utf8Error" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1177 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1179 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some("crate::c_types::PublicKey::from_rust(&"),
1180 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature::from_rust(&"),
1181 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature::from_rust(&"),
1182 "bitcoin::secp256k1::SecretKey" if is_ref => Some(""),
1183 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
1184 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
1185 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
1186 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("crate::c_types::Transaction::from_bitcoin("),
1187 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction::from_bitcoin(&"),
1188 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
1189 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
1190 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1191 "bitcoin::util::address::WitnessVersion" => Some(""),
1192 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1193 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1195 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1197 // Newtypes that we just expose in their original form.
1198 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1199 if is_ref => Some(""),
1200 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1201 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1202 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1203 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1204 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1205 if is_ref => Some("&"),
1206 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1207 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1208 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1210 "lightning::io::Read" => Some("crate::c_types::u8slice::from_vec(&crate::c_types::reader_to_vec("),
1213 }.map(|s| s.to_owned())
1215 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1216 if self.is_primitive(full_path) {
1217 return Some("".to_owned());
1220 "Result" if !is_ref => Some(""),
1221 "Vec" if !is_ref => Some(".into()"),
1222 "Option" => Some(""),
1224 "[u8; 32]" if !is_ref => Some(" }"),
1225 "[u8; 32]" if is_ref => Some(""),
1226 "[u8; 20]" if !is_ref => Some(" }"),
1227 "[u8; 16]" if !is_ref => Some(" }"),
1228 "[u8; 12]" if !is_ref => Some(" }"),
1229 "[u8; 4]" if !is_ref => Some(" }"),
1230 "[u8; 3]" if is_ref => Some(""),
1232 "[u8]" if is_ref => Some(""),
1233 "[usize]" if is_ref => Some(""),
1235 "str" if is_ref => Some(".into()"),
1236 "alloc::string::String"|"String" if is_ref => Some(".as_str().into()"),
1237 "alloc::string::String"|"String" => Some(".into()"),
1239 "std::time::Duration"|"core::time::Duration" => Some(".as_secs()"),
1240 "std::time::SystemTime" => Some(".duration_since(::std::time::SystemTime::UNIX_EPOCH).expect(\"Times must be post-1970\").as_secs()"),
1241 "std::io::Error"|"lightning::io::Error" => Some(")"),
1242 "core::fmt::Arguments" => Some(").into()"),
1244 "core::convert::Infallible" => Some("\")"),
1246 "bitcoin::secp256k1::Error"|"bech32::Error"
1247 if !is_ref => Some(")"),
1248 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1249 if !is_ref => Some(")"),
1251 "core::num::ParseIntError" => Some("*/"),
1252 "core::str::Utf8Error" => Some("*/"),
1254 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1256 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(")"),
1257 "bitcoin::secp256k1::ecdsa::Signature" => Some(")"),
1258 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(")"),
1259 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(")"),
1260 "bitcoin::secp256k1::SecretKey" if is_ref => Some(".as_ref()"),
1261 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1262 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1263 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(")"),
1264 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1265 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1266 "bitcoin::network::constants::Network" => Some(")"),
1267 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1268 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1269 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1271 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1273 // Newtypes that we just expose in their original form.
1274 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1275 if is_ref => Some(".as_inner()"),
1276 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1277 if !is_ref => Some(".into_inner() }"),
1278 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1279 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1280 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1281 if is_ref => Some(".0"),
1282 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1283 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1284 if !is_ref => Some(".0 }"),
1286 "lightning::io::Read" => Some("))"),
1289 }.map(|s| s.to_owned())
1292 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1294 "lightning::ln::PaymentSecret" => Some(".data == [0; 32]"),
1295 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some(".is_null()"),
1296 "bitcoin::secp256k1::ecdsa::Signature" => Some(".is_null()"),
1301 /// When printing a reference to the source crate's rust type, if we need to map it to a
1302 /// different "real" type, it can be done so here.
1303 /// This is useful to work around limitations in the binding type resolver, where we reference
1304 /// a non-public `use` alias.
1305 /// TODO: We should never need to use this!
1306 fn real_rust_type_mapping<'equiv>(&self, thing: &'equiv str) -> &'equiv str {
1308 "lightning::io::Read" => "crate::c_types::io::Read",
1313 // ****************************
1314 // *** Container Processing ***
1315 // ****************************
1317 /// Returns the module path in the generated mapping crate to the containers which we generate
1318 /// when writing to CrateTypes::template_file.
1319 pub fn generated_container_path() -> &'static str {
1320 "crate::c_types::derived"
1322 /// Returns the module path in the generated mapping crate to the container templates, which
1323 /// are then concretized and put in the generated container path/template_file.
1324 fn container_templ_path() -> &'static str {
1328 /// Returns true if the path containing the given args is a "transparent" container, ie an
1329 /// Option or a container which does not require a generated continer class.
1330 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 {
1331 if full_path == "Option" {
1332 let inner = args.next().unwrap();
1333 assert!(args.next().is_none());
1335 syn::Type::Reference(_) => true,
1336 syn::Type::Array(a) => {
1337 if let syn::Expr::Lit(l) = &a.len {
1338 if let syn::Lit::Int(i) = &l.lit {
1339 if i.base10_digits().parse::<usize>().unwrap() >= 32 {
1340 let mut buf = Vec::new();
1341 self.write_rust_type(&mut buf, generics, &a.elem);
1342 let ty = String::from_utf8(buf).unwrap();
1345 // Blindly assume that if we're trying to create an empty value for an
1346 // array < 32 entries that all-0s may be a valid state.
1349 } else { unimplemented!(); }
1350 } else { unimplemented!(); }
1352 syn::Type::Path(p) => {
1353 if let Some(resolved) = self.maybe_resolve_path(&p.path, generics) {
1354 if self.c_type_has_inner_from_path(&resolved) { return true; }
1355 if self.is_primitive(&resolved) { return false; }
1356 if self.c_type_from_path(&resolved, false, false).is_some() { true } else { false }
1359 syn::Type::Tuple(_) => false,
1360 _ => unimplemented!(),
1364 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1365 /// not require a generated continer class.
1366 pub fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1367 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1368 syn::PathArguments::None => return false,
1369 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1370 if let syn::GenericArgument::Type(ref ty) = arg {
1372 } else { unimplemented!() }
1374 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1376 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter, generics)
1378 /// Returns true if this is a known, supported, non-transparent container.
1379 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1380 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1382 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)
1383 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1384 // expecting one element in the vec per generic type, each of which is inline-converted
1385 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1387 "Result" if !is_ref => {
1389 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1390 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1391 ").into() }", ContainerPrefixLocation::PerConv))
1395 // We should only get here if the single contained has an inner
1396 assert!(self.c_type_has_inner(single_contained.unwrap()));
1398 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1401 if let Some(syn::Type::Reference(_)) = single_contained {
1402 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "(*item)".to_string())], "); }", ContainerPrefixLocation::PerConv))
1404 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1408 let mut is_contained_ref = false;
1409 let contained_struct = if let Some(syn::Type::Path(p)) = single_contained {
1410 Some(self.resolve_path(&p.path, generics))
1411 } else if let Some(syn::Type::Reference(r)) = single_contained {
1412 is_contained_ref = true;
1413 if let syn::Type::Path(p) = &*r.elem {
1414 Some(self.resolve_path(&p.path, generics))
1417 if let Some(inner_path) = contained_struct {
1418 let only_contained_has_inner = self.c_type_has_inner_from_path(&inner_path);
1419 if self.c_type_has_inner_from_path(&inner_path) {
1420 let is_inner_ref = if let Some(syn::Type::Reference(_)) = single_contained { true } else { false };
1422 return Some(("if ", vec![
1423 (".is_none() { core::ptr::null() } else { ObjOps::nonnull_ptr_to_inner(".to_owned(),
1424 format!("({}{}.unwrap())", var_access, if is_inner_ref { "" } else { ".as_ref()" }))
1425 ], ") }", ContainerPrefixLocation::OutsideConv));
1427 return Some(("if ", vec![
1428 (".is_none() { core::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1429 ], " }", ContainerPrefixLocation::OutsideConv));
1431 } else if self.is_primitive(&inner_path) || self.c_type_from_path(&inner_path, false, false).is_none() {
1432 if self.is_primitive(&inner_path) || (!is_contained_ref && !is_ref) || only_contained_has_inner {
1433 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1434 return Some(("if ", vec![
1435 (format!(".is_none() {{ {}::None }} else {{ {}::Some(", inner_name, inner_name),
1436 format!("{}.unwrap()", var_access))
1437 ], ") }", ContainerPrefixLocation::PerConv));
1439 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1440 return Some(("if ", vec![
1441 (format!(".is_none() {{ {}::None }} else {{ {}::Some(/* WARNING: CLONING CONVERSION HERE! &Option<Enum> is otherwise un-expressable. */", inner_name, inner_name),
1442 format!("{}.clone().unwrap()", var_access))
1443 ], ") }", ContainerPrefixLocation::PerConv));
1446 // If c_type_from_path is some (ie there's a manual mapping for the inner
1447 // type), lean on write_empty_rust_val, below.
1450 if let Some(t) = single_contained {
1451 if let syn::Type::Tuple(syn::TypeTuple { elems, .. }) = t {
1452 assert!(elems.is_empty());
1453 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1454 return Some(("if ", vec![
1455 (format!(".is_none() {{ {}::None }} else {{ {}::Some /*",
1456 inner_name, inner_name), format!(""))
1457 ], " */}", ContainerPrefixLocation::PerConv));
1459 if let syn::Type::Reference(syn::TypeReference { elem, .. }) = t {
1460 if let syn::Type::Slice(_) = &**elem {
1461 return Some(("if ", vec![
1462 (".is_none() { SmartPtr::null() } else { SmartPtr::from_obj(".to_string(),
1463 format!("({}.unwrap())", var_access))
1464 ], ") }", ContainerPrefixLocation::PerConv));
1467 let mut v = Vec::new();
1468 self.write_empty_rust_val(generics, &mut v, t);
1469 let s = String::from_utf8(v).unwrap();
1470 return Some(("if ", vec![
1471 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1472 ], " }", ContainerPrefixLocation::PerConv));
1473 } else { unreachable!(); }
1479 /// only_contained_has_inner implies that there is only one contained element in the container
1480 /// and it has an inner field (ie is an "opaque" type we've defined).
1481 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)
1482 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1483 // expecting one element in the vec per generic type, each of which is inline-converted
1484 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1485 let mut only_contained_has_inner = false;
1486 let only_contained_resolved = if let Some(syn::Type::Path(p)) = single_contained {
1487 let res = self.resolve_path(&p.path, generics);
1488 only_contained_has_inner = self.c_type_has_inner_from_path(&res);
1492 "Result" if !is_ref => {
1494 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1495 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1496 ")}", ContainerPrefixLocation::PerConv))
1498 "Slice" if is_ref && only_contained_has_inner => {
1499 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1502 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1505 if let Some(resolved) = only_contained_resolved {
1506 if self.is_primitive(&resolved) {
1507 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1508 } else if only_contained_has_inner {
1510 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1512 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1517 if let Some(t) = single_contained {
1519 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_)|syn::Type::Array(_) => {
1520 let mut v = Vec::new();
1521 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1522 let s = String::from_utf8(v).unwrap();
1524 EmptyValExpectedTy::ReferenceAsPointer =>
1525 return Some(("if ", vec![
1526 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1527 ], ") }", ContainerPrefixLocation::NoPrefix)),
1528 EmptyValExpectedTy::OptionType =>
1529 return Some(("{ /* ", vec![
1530 (format!("*/ let {}_opt = {};", var_name, var_access),
1531 format!("}} if {}_opt{} {{ None }} else {{ Some({{ {}_opt.take()", var_name, s, var_name))
1532 ], ") } }", ContainerPrefixLocation::PerConv)),
1533 EmptyValExpectedTy::NonPointer =>
1534 return Some(("if ", vec![
1535 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1536 ], ") }", ContainerPrefixLocation::PerConv)),
1539 syn::Type::Tuple(_) => {
1540 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1542 _ => unimplemented!(),
1544 } else { unreachable!(); }
1550 /// Constructs a reference to the given type, possibly tweaking the type if relevant to make it
1551 /// convertable to C.
1552 pub fn create_ownable_reference(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> Option<syn::Type> {
1553 let default_value = Some(syn::Type::Reference(syn::TypeReference {
1554 and_token: syn::Token!(&)(Span::call_site()), lifetime: None, mutability: None,
1555 elem: Box::new(t.clone()) }));
1556 match generics.resolve_type(t) {
1557 syn::Type::Path(p) => {
1558 if let Some(resolved_path) = self.maybe_resolve_path(&p.path, generics) {
1559 if resolved_path != "Vec" { return default_value; }
1560 if p.path.segments.len() != 1 { unimplemented!(); }
1561 let only_seg = p.path.segments.iter().next().unwrap();
1562 if let syn::PathArguments::AngleBracketed(args) = &only_seg.arguments {
1563 if args.args.len() != 1 { unimplemented!(); }
1564 let inner_arg = args.args.iter().next().unwrap();
1565 if let syn::GenericArgument::Type(ty) = &inner_arg {
1566 let mut can_create = self.c_type_has_inner(&ty);
1567 if let syn::Type::Path(inner) = ty {
1568 if inner.path.segments.len() == 1 &&
1569 format!("{}", inner.path.segments[0].ident) == "Vec" {
1573 if !can_create { return default_value; }
1574 if let Some(inner_ty) = self.create_ownable_reference(&ty, generics) {
1575 return Some(syn::Type::Reference(syn::TypeReference {
1576 and_token: syn::Token![&](Span::call_site()),
1579 elem: Box::new(syn::Type::Slice(syn::TypeSlice {
1580 bracket_token: syn::token::Bracket { span: Span::call_site() },
1581 elem: Box::new(inner_ty)
1584 } else { return default_value; }
1585 } else { unimplemented!(); }
1586 } else { unimplemented!(); }
1587 } else { return None; }
1593 // *************************************************
1594 // *** Type definition during main.rs processing ***
1595 // *************************************************
1597 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1598 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool {
1599 self.crate_types.opaques.get(full_path).is_some()
1602 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1603 pub fn c_type_has_inner(&self, ty: &syn::Type) -> bool {
1605 syn::Type::Path(p) => {
1606 if let Some(full_path) = self.maybe_resolve_path(&p.path, None) {
1607 self.c_type_has_inner_from_path(&full_path)
1610 syn::Type::Reference(r) => {
1611 self.c_type_has_inner(&*r.elem)
1617 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1618 self.types.maybe_resolve_ident(id)
1621 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1622 self.types.maybe_resolve_path(p_arg, generics)
1624 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1625 self.maybe_resolve_path(p, generics).unwrap()
1628 // ***********************************
1629 // *** Original Rust Type Printing ***
1630 // ***********************************
1632 fn in_rust_prelude(resolved_path: &str) -> bool {
1633 match resolved_path {
1641 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path) {
1642 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1643 if self.is_primitive(&resolved) {
1644 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1646 // TODO: We should have a generic "is from a dependency" check here instead of
1647 // checking for "bitcoin" explicitly.
1648 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1649 write!(w, "{}", resolved).unwrap();
1650 // If we're printing a generic argument, it needs to reference the crate, otherwise
1651 // the original crate:
1652 } else if self.maybe_resolve_path(&path, None).as_ref() == Some(&resolved) {
1653 write!(w, "{}", self.real_rust_type_mapping(&resolved)).unwrap();
1655 write!(w, "crate::{}", resolved).unwrap();
1658 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1659 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1662 if path.leading_colon.is_some() {
1663 write!(w, "::").unwrap();
1665 for (idx, seg) in path.segments.iter().enumerate() {
1666 if idx != 0 { write!(w, "::").unwrap(); }
1667 write!(w, "{}", seg.ident).unwrap();
1668 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1669 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1674 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>) {
1675 let mut had_params = false;
1676 for (idx, arg) in generics.enumerate() {
1677 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1680 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1681 syn::GenericParam::Type(t) => {
1682 write!(w, "{}", t.ident).unwrap();
1683 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1684 for (idx, bound) in t.bounds.iter().enumerate() {
1685 if idx != 0 { write!(w, " + ").unwrap(); }
1687 syn::TypeParamBound::Trait(tb) => {
1688 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1689 self.write_rust_path(w, generics_resolver, &tb.path);
1691 _ => unimplemented!(),
1694 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1696 _ => unimplemented!(),
1699 if had_params { write!(w, ">").unwrap(); }
1702 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>) {
1703 write!(w, "<").unwrap();
1704 for (idx, arg) in generics.enumerate() {
1705 if idx != 0 { write!(w, ", ").unwrap(); }
1707 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t),
1708 _ => unimplemented!(),
1711 write!(w, ">").unwrap();
1713 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
1714 match generics.resolve_type(t) {
1715 syn::Type::Path(p) => {
1716 if p.qself.is_some() {
1719 self.write_rust_path(w, generics, &p.path);
1721 syn::Type::Reference(r) => {
1722 write!(w, "&").unwrap();
1723 if let Some(lft) = &r.lifetime {
1724 write!(w, "'{} ", lft.ident).unwrap();
1726 if r.mutability.is_some() {
1727 write!(w, "mut ").unwrap();
1729 self.write_rust_type(w, generics, &*r.elem);
1731 syn::Type::Array(a) => {
1732 write!(w, "[").unwrap();
1733 self.write_rust_type(w, generics, &a.elem);
1734 if let syn::Expr::Lit(l) = &a.len {
1735 if let syn::Lit::Int(i) = &l.lit {
1736 write!(w, "; {}]", i).unwrap();
1737 } else { unimplemented!(); }
1738 } else { unimplemented!(); }
1740 syn::Type::Slice(s) => {
1741 write!(w, "[").unwrap();
1742 self.write_rust_type(w, generics, &s.elem);
1743 write!(w, "]").unwrap();
1745 syn::Type::Tuple(s) => {
1746 write!(w, "(").unwrap();
1747 for (idx, t) in s.elems.iter().enumerate() {
1748 if idx != 0 { write!(w, ", ").unwrap(); }
1749 self.write_rust_type(w, generics, &t);
1751 write!(w, ")").unwrap();
1753 _ => unimplemented!(),
1757 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1758 /// unint'd memory).
1759 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1761 syn::Type::Reference(r) => {
1762 self.write_empty_rust_val(generics, w, &*r.elem)
1764 syn::Type::Path(p) => {
1765 let resolved = self.resolve_path(&p.path, generics);
1766 if self.crate_types.opaques.get(&resolved).is_some() {
1767 write!(w, "crate::{} {{ inner: core::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1769 // Assume its a manually-mapped C type, where we can just define an null() fn
1770 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1773 syn::Type::Array(a) => {
1774 if let syn::Expr::Lit(l) = &a.len {
1775 if let syn::Lit::Int(i) = &l.lit {
1776 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1777 // Blindly assume that if we're trying to create an empty value for an
1778 // array < 32 entries that all-0s may be a valid state.
1781 let arrty = format!("[u8; {}]", i.base10_digits());
1782 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1783 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1784 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1785 } else { unimplemented!(); }
1786 } else { unimplemented!(); }
1788 _ => unimplemented!(),
1792 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1793 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1794 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1795 let mut split = real_ty.split("; ");
1796 split.next().unwrap();
1797 let tail_str = split.next().unwrap();
1798 assert!(split.next().is_none());
1799 let len = usize::from_str_radix(&tail_str[..tail_str.len() - 1], 10).unwrap();
1800 Some(parse_quote!([u8; #len]))
1805 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1806 /// See EmptyValExpectedTy for information on return types.
1807 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1809 syn::Type::Reference(r) => {
1810 return self.write_empty_rust_val_check_suffix(generics, w, &*r.elem);
1812 syn::Type::Path(p) => {
1813 let resolved = self.resolve_path(&p.path, generics);
1814 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1815 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1817 if self.crate_types.opaques.get(&resolved).is_some() {
1818 write!(w, ".inner.is_null()").unwrap();
1819 EmptyValExpectedTy::NonPointer
1821 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1822 write!(w, "{}", suffix).unwrap();
1823 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1824 EmptyValExpectedTy::NonPointer
1826 write!(w, ".is_none()").unwrap();
1827 EmptyValExpectedTy::OptionType
1831 syn::Type::Array(a) => {
1832 if let syn::Expr::Lit(l) = &a.len {
1833 if let syn::Lit::Int(i) = &l.lit {
1834 write!(w, ".data == [0; {}]", i.base10_digits()).unwrap();
1835 EmptyValExpectedTy::NonPointer
1836 } else { unimplemented!(); }
1837 } else { unimplemented!(); }
1839 syn::Type::Slice(_) => {
1840 // Option<[]> always implies that we want to treat len() == 0 differently from
1841 // None, so we always map an Option<[]> into a pointer.
1842 write!(w, " == core::ptr::null_mut()").unwrap();
1843 EmptyValExpectedTy::ReferenceAsPointer
1845 _ => unimplemented!(),
1849 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1850 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
1852 syn::Type::Reference(r) => {
1853 self.write_empty_rust_val_check(generics, w, &*r.elem, var_access);
1855 syn::Type::Path(_) => {
1856 write!(w, "{}", var_access).unwrap();
1857 self.write_empty_rust_val_check_suffix(generics, w, t);
1859 syn::Type::Array(a) => {
1860 if let syn::Expr::Lit(l) = &a.len {
1861 if let syn::Lit::Int(i) = &l.lit {
1862 let arrty = format!("[u8; {}]", i.base10_digits());
1863 // We don't (yet) support a new-var conversion here.
1864 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
1866 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
1868 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
1869 self.write_empty_rust_val_check_suffix(generics, w, t);
1870 } else { unimplemented!(); }
1871 } else { unimplemented!(); }
1873 _ => unimplemented!(),
1877 // ********************************
1878 // *** Type conversion printing ***
1879 // ********************************
1881 /// Returns true we if can just skip passing this to C entirely
1882 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
1884 syn::Type::Path(p) => {
1885 if p.qself.is_some() { unimplemented!(); }
1886 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1887 self.skip_path(&full_path)
1890 syn::Type::Reference(r) => {
1891 self.skip_arg(&*r.elem, generics)
1896 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1898 syn::Type::Path(p) => {
1899 if p.qself.is_some() { unimplemented!(); }
1900 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1901 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
1904 syn::Type::Reference(r) => {
1905 self.no_arg_to_rust(w, &*r.elem, generics);
1911 fn write_conversion_inline_intern<W: std::io::Write,
1912 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool, Option<&str>) -> String>
1913 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
1914 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
1915 match generics.resolve_type(t) {
1916 syn::Type::Reference(r) => {
1917 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
1918 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1920 syn::Type::Path(p) => {
1921 if p.qself.is_some() {
1925 let resolved_path = self.resolve_path(&p.path, generics);
1926 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1927 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1928 } else if self.is_primitive(&resolved_path) {
1929 if is_ref && prefix {
1930 write!(w, "*").unwrap();
1932 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
1933 write!(w, "{}", c_type).unwrap();
1934 } else if let Some((_, generics)) = self.crate_types.opaques.get(&resolved_path) {
1935 decl_lookup(w, &DeclType::StructImported { generics: &generics }, &resolved_path, is_ref, is_mut);
1936 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
1937 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
1938 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
1939 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
1940 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
1941 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
1942 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
1943 } else { unimplemented!(); }
1944 } else { unimplemented!(); }
1946 syn::Type::Array(a) => {
1947 // We assume all arrays contain only [int_literal; X]s.
1948 // This may result in some outputs not compiling.
1949 if let syn::Expr::Lit(l) = &a.len {
1950 if let syn::Lit::Int(i) = &l.lit {
1951 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
1952 } else { unimplemented!(); }
1953 } else { unimplemented!(); }
1955 syn::Type::Slice(s) => {
1956 // We assume all slices contain only literals or references.
1957 // This may result in some outputs not compiling.
1958 if let syn::Type::Path(p) = &*s.elem {
1959 let resolved = self.resolve_path(&p.path, generics);
1960 if self.is_primitive(&resolved) {
1961 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
1963 write!(w, "{}", sliceconv(true, None)).unwrap();
1965 } else if let syn::Type::Reference(r) = &*s.elem {
1966 if let syn::Type::Path(p) = &*r.elem {
1967 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)), None)).unwrap();
1968 } else if let syn::Type::Slice(_) = &*r.elem {
1969 write!(w, "{}", sliceconv(false, None)).unwrap();
1970 } else { unimplemented!(); }
1971 } else if let syn::Type::Tuple(t) = &*s.elem {
1972 assert!(!t.elems.is_empty());
1974 write!(w, "{}", sliceconv(false, None)).unwrap();
1976 let mut needs_map = false;
1977 for e in t.elems.iter() {
1978 if let syn::Type::Reference(_) = e {
1983 let mut map_str = Vec::new();
1984 write!(&mut map_str, ".map(|(").unwrap();
1985 for i in 0..t.elems.len() {
1986 write!(&mut map_str, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
1988 write!(&mut map_str, ")| (").unwrap();
1989 for (idx, e) in t.elems.iter().enumerate() {
1990 if let syn::Type::Reference(_) = e {
1991 write!(&mut map_str, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1992 } else if let syn::Type::Path(_) = e {
1993 write!(&mut map_str, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1994 } else { unimplemented!(); }
1996 write!(&mut map_str, "))").unwrap();
1997 write!(w, "{}", sliceconv(false, Some(&String::from_utf8(map_str).unwrap()))).unwrap();
1999 write!(w, "{}", sliceconv(false, None)).unwrap();
2002 } else { unimplemented!(); }
2004 syn::Type::Tuple(t) => {
2005 if t.elems.is_empty() {
2006 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
2007 // so work around it by just pretending its a 0u8
2008 write!(w, "{}", tupleconv).unwrap();
2010 if prefix { write!(w, "local_").unwrap(); }
2013 _ => unimplemented!(),
2017 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) {
2018 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "() /*", true, |_, _| "local_".to_owned(),
2019 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
2020 |w, decl_type, decl_path, is_ref, _is_mut| {
2022 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(", decl_path).unwrap(),
2023 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(", decl_path).unwrap(),
2024 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
2025 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref && from_ptr => {
2026 if !ptr_for_ref { write!(w, "&").unwrap(); }
2027 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap()
2029 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref => {
2030 if !ptr_for_ref { write!(w, "&").unwrap(); }
2031 write!(w, "crate::{} {{ inner: unsafe {{ ObjOps::nonnull_ptr_to_inner((", decl_path).unwrap()
2033 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2034 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
2035 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref =>
2036 write!(w, "crate::{} {{ inner: ObjOps::heap_alloc(", decl_path).unwrap(),
2037 DeclType::Trait(_) if is_ref => write!(w, "").unwrap(),
2038 DeclType::Trait(_) if !is_ref => write!(w, "Into::into(").unwrap(),
2039 _ => panic!("{:?}", decl_path),
2043 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) {
2044 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
2046 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) {
2047 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_, _| ".into()".to_owned(),
2048 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
2049 |w, decl_type, full_path, is_ref, _is_mut| match decl_type {
2050 DeclType::MirroredEnum => write!(w, ")").unwrap(),
2051 DeclType::EnumIgnored { generics }|DeclType::StructImported { generics } if is_ref => {
2052 write!(w, " as *const {}<", full_path).unwrap();
2053 for param in generics.params.iter() {
2054 if let syn::GenericParam::Lifetime(_) = param {
2055 write!(w, "'_, ").unwrap();
2057 write!(w, "_, ").unwrap();
2061 write!(w, ">) as *mut _ }}, is_owned: false }}").unwrap();
2063 write!(w, ">) as *mut _) }}, is_owned: false }}").unwrap();
2066 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2067 write!(w, ", is_owned: true }}").unwrap(),
2068 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref => write!(w, "), is_owned: true }}").unwrap(),
2069 DeclType::Trait(_) if is_ref => {},
2070 DeclType::Trait(_) => {
2071 // This is used when we're converting a concrete Rust type into a C trait
2072 // for use when a Rust trait method returns an associated type.
2073 // Because all of our C traits implement From<RustTypesImplementingTraits>
2074 // we can just call .into() here and be done.
2075 write!(w, ")").unwrap()
2077 _ => unimplemented!(),
2080 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) {
2081 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
2084 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) {
2085 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2086 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
2087 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2088 DeclType::StructImported {..} if is_ref => write!(w, "").unwrap(),
2089 DeclType::StructImported {..} if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
2090 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
2091 DeclType::MirroredEnum => {},
2092 DeclType::Trait(_) => {},
2093 _ => unimplemented!(),
2096 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2097 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
2099 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) {
2100 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
2101 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2102 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2103 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2104 (true, None) => "[..]".to_owned(),
2105 (true, Some(_)) => unreachable!(),
2107 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2108 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
2109 DeclType::StructImported {..} if is_ref && ptr_for_ref => write!(w, "XXX unimplemented").unwrap(),
2110 DeclType::StructImported {..} if is_mut && is_ref => write!(w, ".get_native_mut_ref()").unwrap(),
2111 DeclType::StructImported {..} if is_ref => write!(w, ".get_native_ref()").unwrap(),
2112 DeclType::StructImported {..} if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
2113 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
2114 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
2115 DeclType::Trait(_) => {},
2116 _ => unimplemented!(),
2119 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2120 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
2122 // Note that compared to the above conversion functions, the following two are generally
2123 // significantly undertested:
2124 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2125 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2127 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
2128 Some(format!("&{}", conv))
2131 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2132 DeclType::StructImported {..} if !is_ref => write!(w, "").unwrap(),
2133 _ => unimplemented!(),
2136 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2137 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
2138 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2139 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2140 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2141 (true, None) => "[..]".to_owned(),
2142 (true, Some(_)) => unreachable!(),
2144 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2145 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2146 DeclType::StructImported {..} if !is_ref => write!(w, ".get_native_ref()").unwrap(),
2147 _ => unimplemented!(),
2151 fn write_conversion_new_var_intern<'b, W: std::io::Write,
2152 LP: Fn(&str, bool) -> Option<(&str, &str)>,
2153 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
2154 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
2155 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
2156 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
2157 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool, from_ownable_ref: bool,
2158 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
2160 macro_rules! convert_container {
2161 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
2162 // For slices (and Options), we refuse to directly map them as is_ref when they
2163 // aren't opaque types containing an inner pointer. This is due to the fact that,
2164 // in both cases, the actual higher-level type is non-is_ref.
2165 let ty_has_inner = if $args_len == 1 {
2166 let ty = $args_iter().next().unwrap();
2167 if $container_type == "Slice" && to_c {
2168 // "To C ptr_for_ref" means "return the regular object with is_owned
2169 // set to false", which is totally what we want in a slice if we're about to
2170 // set ty_has_inner.
2173 if let syn::Type::Reference(t) = ty {
2174 if let syn::Type::Path(p) = &*t.elem {
2175 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2177 } else if let syn::Type::Path(p) = ty {
2178 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2182 // Options get a bunch of special handling, since in general we map Option<>al
2183 // types into the same C type as non-Option-wrapped types. This ends up being
2184 // pretty manual here and most of the below special-cases are for Options.
2185 let mut needs_ref_map = false;
2186 let mut only_contained_type = None;
2187 let mut only_contained_type_nonref = None;
2188 let mut only_contained_has_inner = false;
2189 let mut contains_slice = false;
2191 only_contained_has_inner = ty_has_inner;
2192 let arg = $args_iter().next().unwrap();
2193 if let syn::Type::Reference(t) = arg {
2194 only_contained_type = Some(arg);
2195 only_contained_type_nonref = Some(&*t.elem);
2196 if let syn::Type::Path(_) = &*t.elem {
2198 } else if let syn::Type::Slice(_) = &*t.elem {
2199 contains_slice = true;
2200 } else { return false; }
2201 // If the inner element contains an inner pointer, we will just use that,
2202 // avoiding the need to map elements to references. Otherwise we'll need to
2203 // do an extra mapping step.
2204 needs_ref_map = !only_contained_has_inner && $container_type == "Option";
2206 only_contained_type = Some(arg);
2207 only_contained_type_nonref = Some(arg);
2211 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref, only_contained_type, ident, var) {
2212 assert_eq!(conversions.len(), $args_len);
2213 write!(w, "let mut local_{}{} = ", ident,
2214 if (!to_c && needs_ref_map) || (to_c && $container_type == "Option" && contains_slice) {"_base"} else { "" }).unwrap();
2215 if prefix_location == ContainerPrefixLocation::OutsideConv {
2216 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2218 write!(w, "{}{}", prefix, var).unwrap();
2220 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
2221 let mut var = std::io::Cursor::new(Vec::new());
2222 write!(&mut var, "{}", var_name).unwrap();
2223 let var_access = String::from_utf8(var.into_inner()).unwrap();
2225 let conv_ty = if needs_ref_map { only_contained_type_nonref.as_ref().unwrap() } else { ty };
2227 write!(w, "{} {{ ", pfx).unwrap();
2228 let new_var_name = format!("{}_{}", ident, idx);
2229 let new_var = self.write_conversion_new_var_intern(w, &format_ident!("{}", new_var_name),
2230 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref,
2231 to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2232 if new_var { write!(w, " ").unwrap(); }
2234 if prefix_location == ContainerPrefixLocation::PerConv {
2235 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2236 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2237 write!(w, "ObjOps::heap_alloc(").unwrap();
2240 write!(w, "{}{}", if contains_slice && !to_c { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
2241 if prefix_location == ContainerPrefixLocation::PerConv {
2242 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2243 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2244 write!(w, ")").unwrap();
2246 write!(w, " }}").unwrap();
2248 write!(w, "{}", suffix).unwrap();
2249 if prefix_location == ContainerPrefixLocation::OutsideConv {
2250 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2252 write!(w, ";").unwrap();
2253 if !to_c && needs_ref_map {
2254 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
2256 write!(w, ".map(|a| &a[..])").unwrap();
2258 write!(w, ";").unwrap();
2259 } else if to_c && $container_type == "Option" && contains_slice {
2260 write!(w, " let mut local_{} = *local_{}_base;", ident, ident).unwrap();
2267 match generics.resolve_type(t) {
2268 syn::Type::Reference(r) => {
2269 if let syn::Type::Slice(_) = &*r.elem {
2270 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)
2272 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)
2275 syn::Type::Path(p) => {
2276 if p.qself.is_some() {
2279 let resolved_path = self.resolve_path(&p.path, generics);
2280 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
2281 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);
2283 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2284 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
2285 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
2286 if let syn::GenericArgument::Type(ty) = arg {
2287 generics.resolve_type(ty)
2288 } else { unimplemented!(); }
2290 } else { unimplemented!(); }
2292 if self.is_primitive(&resolved_path) {
2294 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
2295 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
2296 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2298 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
2303 syn::Type::Array(_) => {
2304 // We assume all arrays contain only primitive types.
2305 // This may result in some outputs not compiling.
2308 syn::Type::Slice(s) => {
2309 if let syn::Type::Path(p) = &*s.elem {
2310 let resolved = self.resolve_path(&p.path, generics);
2311 if self.is_primitive(&resolved) {
2312 let slice_path = format!("[{}]", resolved);
2313 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
2314 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2318 let tyref = [&*s.elem];
2320 // If we're converting from a slice to a Vec, assume we can clone the
2321 // elements and clone them into a new Vec first. Next we'll walk the
2322 // new Vec here and convert them to C types.
2323 write!(w, "let mut local_{}_clone = Vec::new(); local_{}_clone.extend_from_slice({}); let mut {} = local_{}_clone; ", ident, ident, ident, ident, ident).unwrap();
2326 convert_container!("Vec", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2327 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2329 } else if let syn::Type::Reference(ty) = &*s.elem {
2330 let tyref = if from_ownable_ref || !to_c { [&*ty.elem] } else { [&*s.elem] };
2332 convert_container!("Slice", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2333 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2334 } else if let syn::Type::Tuple(t) = &*s.elem {
2335 // When mapping into a temporary new var, we need to own all the underlying objects.
2336 // Thus, we drop any references inside the tuple and convert with non-reference types.
2337 let mut elems = syn::punctuated::Punctuated::new();
2338 for elem in t.elems.iter() {
2339 if let syn::Type::Reference(r) = elem {
2340 elems.push((*r.elem).clone());
2342 elems.push(elem.clone());
2345 let ty = [syn::Type::Tuple(syn::TypeTuple {
2346 paren_token: t.paren_token, elems
2350 convert_container!("Slice", 1, || ty.iter());
2351 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2352 } else { unimplemented!() }
2354 syn::Type::Tuple(t) => {
2355 if !t.elems.is_empty() {
2356 // We don't (yet) support tuple elements which cannot be converted inline
2357 write!(w, "let (").unwrap();
2358 for idx in 0..t.elems.len() {
2359 if idx != 0 { write!(w, ", ").unwrap(); }
2360 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
2362 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
2363 // Like other template types, tuples are always mapped as their non-ref
2364 // versions for types which have different ref mappings. Thus, we convert to
2365 // non-ref versions and handle opaque types with inner pointers manually.
2366 for (idx, elem) in t.elems.iter().enumerate() {
2367 if let syn::Type::Path(p) = elem {
2368 let v_name = format!("orig_{}_{}", ident, idx);
2369 let tuple_elem_ident = format_ident!("{}", &v_name);
2370 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
2371 false, ptr_for_ref, to_c, from_ownable_ref,
2372 path_lookup, container_lookup, var_prefix, var_suffix) {
2373 write!(w, " ").unwrap();
2374 // Opaque types with inner pointers shouldn't ever create new stack
2375 // variables, so we don't handle it and just assert that it doesn't
2377 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
2381 write!(w, "let mut local_{} = (", ident).unwrap();
2382 for (idx, elem) in t.elems.iter().enumerate() {
2383 let real_elem = generics.resolve_type(&elem);
2384 let ty_has_inner = {
2386 // "To C ptr_for_ref" means "return the regular object with
2387 // is_owned set to false", which is totally what we want
2388 // if we're about to set ty_has_inner.
2391 if let syn::Type::Reference(t) = real_elem {
2392 if let syn::Type::Path(p) = &*t.elem {
2393 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2395 } else if let syn::Type::Path(p) = real_elem {
2396 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2399 if idx != 0 { write!(w, ", ").unwrap(); }
2400 var_prefix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2401 if is_ref && ty_has_inner {
2402 // For ty_has_inner, the regular var_prefix mapping will take a
2403 // reference, so deref once here to make sure we keep the original ref.
2404 write!(w, "*").unwrap();
2406 write!(w, "orig_{}_{}", ident, idx).unwrap();
2407 if is_ref && !ty_has_inner {
2408 // If we don't have an inner variable's reference to maintain, just
2409 // hope the type is Clonable and use that.
2410 write!(w, ".clone()").unwrap();
2412 var_suffix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2414 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2418 _ => unimplemented!(),
2422 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 {
2423 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, from_ownable_ref, ptr_for_ref, true, from_ownable_ref,
2424 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2425 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2426 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2427 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2428 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2430 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 {
2431 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref, false)
2433 /// Prints new-var conversion for an "ownable_ref" type, ie prints conversion for
2434 /// `create_ownable_reference(t)`, not `t` itself.
2435 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 {
2436 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, true, true)
2438 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 {
2439 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false, false,
2440 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2441 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2442 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2443 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2444 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2447 // ******************************************************
2448 // *** C Container Type Equivalent and alias Printing ***
2449 // ******************************************************
2451 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 {
2452 for (idx, t) in args.enumerate() {
2454 write!(w, ", ").unwrap();
2456 if let syn::Type::Reference(r_arg) = t {
2457 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2459 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false, true, true) { return false; }
2461 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2462 // reference to something stupid, so check that the container is either opaque or a
2463 // predefined type (currently only Transaction).
2464 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2465 let resolved = self.resolve_path(&p_arg.path, generics);
2466 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2467 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2468 } else { unimplemented!(); }
2469 } else if let syn::Type::Path(p_arg) = t {
2470 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2471 if !self.is_primitive(&resolved) {
2472 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2475 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2477 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2479 // We don't currently support outer reference types for non-primitive inners,
2480 // except for the empty tuple.
2481 if let syn::Type::Tuple(t_arg) = t {
2482 assert!(t_arg.elems.len() == 0 || !is_ref);
2486 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2491 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2492 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2493 let mut created_container: Vec<u8> = Vec::new();
2495 if container_type == "Result" {
2496 let mut a_ty: Vec<u8> = Vec::new();
2497 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2498 if tup.elems.is_empty() {
2499 write!(&mut a_ty, "()").unwrap();
2501 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2504 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2507 let mut b_ty: Vec<u8> = Vec::new();
2508 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2509 if tup.elems.is_empty() {
2510 write!(&mut b_ty, "()").unwrap();
2512 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2515 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2518 let ok_str = String::from_utf8(a_ty).unwrap();
2519 let err_str = String::from_utf8(b_ty).unwrap();
2520 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2521 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2523 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2525 } else if container_type == "Vec" {
2526 let mut a_ty: Vec<u8> = Vec::new();
2527 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2528 let ty = String::from_utf8(a_ty).unwrap();
2529 let is_clonable = self.is_clonable(&ty);
2530 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2532 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2534 } else if container_type.ends_with("Tuple") {
2535 let mut tuple_args = Vec::new();
2536 let mut is_clonable = true;
2537 for arg in args.iter() {
2538 let mut ty: Vec<u8> = Vec::new();
2539 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2540 let ty_str = String::from_utf8(ty).unwrap();
2541 if !self.is_clonable(&ty_str) {
2542 is_clonable = false;
2544 tuple_args.push(ty_str);
2546 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2548 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2550 } else if container_type == "Option" {
2551 let mut a_ty: Vec<u8> = Vec::new();
2552 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2553 let ty = String::from_utf8(a_ty).unwrap();
2554 let is_clonable = self.is_clonable(&ty);
2555 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2557 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2562 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2566 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2567 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2568 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2569 } else { unimplemented!(); }
2571 fn write_c_mangled_container_path_intern<W: std::io::Write>
2572 (&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 {
2573 let mut mangled_type: Vec<u8> = Vec::new();
2574 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2575 write!(w, "C{}_", ident).unwrap();
2576 write!(mangled_type, "C{}_", ident).unwrap();
2577 } else { assert_eq!(args.len(), 1); }
2578 for arg in args.iter() {
2579 macro_rules! write_path {
2580 ($p_arg: expr, $extra_write: expr) => {
2581 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2582 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2584 if self.c_type_has_inner_from_path(&subtype) {
2585 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref, false, true) { return false; }
2587 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2588 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false, false, true) { return false; }
2590 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2591 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true, false, true) { return false; }
2595 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2597 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2598 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2599 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2602 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2603 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2604 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2605 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2606 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2609 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2610 write!(w, "{}", id).unwrap();
2611 write!(mangled_type, "{}", id).unwrap();
2612 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2613 write!(w2, "{}", id).unwrap();
2616 } else { return false; }
2619 match generics.resolve_type(arg) {
2620 syn::Type::Tuple(tuple) => {
2621 if tuple.elems.len() == 0 {
2622 write!(w, "None").unwrap();
2623 write!(mangled_type, "None").unwrap();
2625 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2627 // Figure out what the mangled type should look like. To disambiguate
2628 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2629 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2630 // available for use in type names.
2631 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2632 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2633 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2634 for elem in tuple.elems.iter() {
2635 if let syn::Type::Path(p) = elem {
2636 write_path!(p, Some(&mut mangled_tuple_type));
2637 } else if let syn::Type::Reference(refelem) = elem {
2638 if let syn::Type::Path(p) = &*refelem.elem {
2639 write_path!(p, Some(&mut mangled_tuple_type));
2640 } else { return false; }
2641 } else { return false; }
2643 write!(w, "Z").unwrap();
2644 write!(mangled_type, "Z").unwrap();
2645 write!(mangled_tuple_type, "Z").unwrap();
2646 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2647 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2652 syn::Type::Path(p_arg) => {
2653 write_path!(p_arg, None);
2655 syn::Type::Reference(refty) => {
2656 if let syn::Type::Path(p_arg) = &*refty.elem {
2657 write_path!(p_arg, None);
2658 } else if let syn::Type::Slice(_) = &*refty.elem {
2659 // write_c_type will actually do exactly what we want here, we just need to
2660 // make it a pointer so that its an option. Note that we cannot always convert
2661 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2662 // to edit it, hence we use *mut here instead of *const.
2663 if args.len() != 1 { return false; }
2664 write!(w, "*mut ").unwrap();
2665 self.write_c_type(w, arg, None, true);
2666 } else { return false; }
2668 syn::Type::Array(a) => {
2669 if let syn::Type::Path(p_arg) = &*a.elem {
2670 let resolved = self.resolve_path(&p_arg.path, generics);
2671 if !self.is_primitive(&resolved) { return false; }
2672 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2673 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2674 if in_type || args.len() != 1 {
2675 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2676 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2678 let arrty = format!("[{}; {}]", resolved, len.base10_digits());
2679 let realty = self.c_type_from_path(&arrty, is_ref, ptr_for_ref).unwrap_or(&arrty);
2680 write!(w, "{}", realty).unwrap();
2681 write!(mangled_type, "{}", realty).unwrap();
2683 } else { return false; }
2684 } else { return false; }
2686 _ => { return false; },
2689 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) { return true; }
2690 // Push the "end of type" Z
2691 write!(w, "Z").unwrap();
2692 write!(mangled_type, "Z").unwrap();
2694 // Make sure the type is actually defined:
2695 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2697 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 {
2698 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2699 write!(w, "{}::", Self::generated_container_path()).unwrap();
2701 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2703 pub fn get_c_mangled_container_type(&self, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, template_name: &str) -> Option<String> {
2704 let mut out = Vec::new();
2705 if !self.write_c_mangled_container_path(&mut out, args, generics, template_name, false, false, false) {
2708 Some(String::from_utf8(out).unwrap())
2711 // **********************************
2712 // *** C Type Equivalent Printing ***
2713 // **********************************
2715 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 {
2716 let full_path = match self.maybe_resolve_path(&path, generics) {
2717 Some(path) => path, None => return false };
2718 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2719 write!(w, "{}", c_type).unwrap();
2721 } else if self.crate_types.traits.get(&full_path).is_some() {
2722 // Note that we always use the crate:: prefix here as we are always referring to a
2723 // concrete object which is of the generated type, it just implements the upstream
2725 if is_ref && ptr_for_ref {
2726 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2728 if with_ref_lifetime { unimplemented!(); }
2729 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2731 write!(w, "crate::{}", full_path).unwrap();
2734 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2735 let crate_pfx = if c_ty { "crate::" } else { "" };
2736 if is_ref && ptr_for_ref {
2737 // ptr_for_ref implies we're returning the object, which we can't really do for
2738 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2739 // the actual object itself (for opaque types we'll set the pointer to the actual
2740 // type and note that its a reference).
2741 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2742 } else if is_ref && with_ref_lifetime {
2744 // If we're concretizing something with a lifetime parameter, we have to pick a
2745 // lifetime, of which the only real available choice is `static`, obviously.
2746 write!(w, "&'static {}", crate_pfx).unwrap();
2748 self.write_rust_path(w, generics, path);
2750 // We shouldn't be mapping references in types, so panic here
2754 write!(w, "&{}{}{}", if is_mut { "mut " } else { "" }, crate_pfx, full_path).unwrap();
2756 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2763 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 {
2764 match generics.resolve_type(t) {
2765 syn::Type::Path(p) => {
2766 if p.qself.is_some() {
2769 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2770 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2771 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);
2773 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2774 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty);
2777 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty)
2779 syn::Type::Reference(r) => {
2780 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref, with_ref_lifetime, c_ty)
2782 syn::Type::Array(a) => {
2783 if is_ref && is_mut {
2784 write!(w, "*mut [").unwrap();
2785 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2787 write!(w, "*const [").unwrap();
2788 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2790 let mut typecheck = Vec::new();
2791 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2792 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2794 if let syn::Expr::Lit(l) = &a.len {
2795 if let syn::Lit::Int(i) = &l.lit {
2797 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2798 write!(w, "{}", ty).unwrap();
2802 write!(w, "; {}]", i).unwrap();
2808 syn::Type::Slice(s) => {
2809 if !is_ref || is_mut { return false; }
2810 if let syn::Type::Path(p) = &*s.elem {
2811 let resolved = self.resolve_path(&p.path, generics);
2812 if self.is_primitive(&resolved) {
2813 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2816 let mut inner_c_ty = Vec::new();
2817 assert!(self.write_c_path_intern(&mut inner_c_ty, &p.path, generics, true, false, ptr_for_ref, with_ref_lifetime, c_ty));
2818 if self.is_clonable(&String::from_utf8(inner_c_ty).unwrap()) {
2819 if let Some(id) = p.path.get_ident() {
2820 let mangled_container = format!("CVec_{}Z", id);
2821 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2822 self.check_create_container(mangled_container, "Vec", vec![&*s.elem], generics, false)
2826 } else if let syn::Type::Reference(r) = &*s.elem {
2827 if let syn::Type::Path(p) = &*r.elem {
2828 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
2829 let resolved = self.resolve_path(&p.path, generics);
2830 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2831 format!("CVec_{}Z", ident)
2832 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
2833 format!("CVec_{}Z", en.ident)
2834 } else if let Some(id) = p.path.get_ident() {
2835 format!("CVec_{}Z", id)
2836 } else { return false; };
2837 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2838 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
2839 } else if let syn::Type::Slice(sl2) = &*r.elem {
2840 if let syn::Type::Reference(r2) = &*sl2.elem {
2841 if let syn::Type::Path(p) = &*r2.elem {
2842 // Slices with slices with opaque types (with is_owned flags) are mapped as non-ref Vecs
2843 let resolved = self.resolve_path(&p.path, generics);
2844 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2845 format!("CVec_CVec_{}ZZ", ident)
2846 } else { return false; };
2847 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2848 let inner = &r2.elem;
2849 let vec_ty: syn::Type = syn::parse_quote!(Vec<#inner>);
2850 self.check_create_container(mangled_container, "Vec", vec![&vec_ty], generics, false)
2854 } else if let syn::Type::Tuple(_) = &*s.elem {
2855 let mut args = syn::punctuated::Punctuated::<_, syn::token::Comma>::new();
2856 args.push(syn::GenericArgument::Type((*s.elem).clone()));
2857 let mut segments = syn::punctuated::Punctuated::new();
2858 segments.push(parse_quote!(Vec<#args>));
2859 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)
2862 syn::Type::Tuple(t) => {
2863 if t.elems.len() == 0 {
2866 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
2867 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
2873 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2874 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, false, true));
2876 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) {
2877 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, true, false));
2879 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
2880 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false, false, true)
2882 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2883 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false, false, true)