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 single_ident_generic_path_to_ident(p: &syn::Path) -> Option<&syn::Ident> {
50 if p.segments.len() == 1 {
51 Some(&p.segments.iter().next().unwrap().ident)
55 pub fn path_matches_nongeneric(p: &syn::Path, exp: &[&str]) -> bool {
56 if p.segments.len() != exp.len() { return false; }
57 for (seg, e) in p.segments.iter().zip(exp.iter()) {
58 if seg.arguments != syn::PathArguments::None { return false; }
59 if &format!("{}", seg.ident) != *e { return false; }
64 #[derive(Debug, PartialEq)]
65 pub enum ExportStatus {
70 /// Gets the ExportStatus of an object (struct, fn, etc) given its attributes.
71 pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
72 for attr in attrs.iter() {
73 let tokens_clone = attr.tokens.clone();
74 let mut token_iter = tokens_clone.into_iter();
75 if let Some(token) = token_iter.next() {
77 TokenTree::Punct(c) if c.as_char() == '=' => {
78 // Really not sure where syn gets '=' from here -
79 // it somehow represents '///' or '//!'
81 TokenTree::Group(g) => {
82 if format!("{}", single_ident_generic_path_to_ident(&attr.path).unwrap()) == "cfg" {
83 let mut iter = g.stream().into_iter();
84 if let TokenTree::Ident(i) = iter.next().unwrap() {
86 // #[cfg(any(test, feature = ""))]
87 if let TokenTree::Group(g) = iter.next().unwrap() {
88 let mut all_test = true;
89 for token in g.stream().into_iter() {
90 if let TokenTree::Ident(i) = token {
91 match format!("{}", i).as_str() {
94 _ => all_test = false,
96 } else if let TokenTree::Literal(lit) = token {
97 if format!("{}", lit) != "fuzztarget" {
102 if all_test { return ExportStatus::TestOnly; }
104 } else if i == "test" || i == "feature" {
105 // If its cfg(feature(...)) we assume its test-only
106 return ExportStatus::TestOnly;
110 continue; // eg #[derive()]
112 _ => unimplemented!(),
115 match token_iter.next().unwrap() {
116 TokenTree::Literal(lit) => {
117 let line = format!("{}", lit);
118 if line.contains("(C-not exported)") {
119 return ExportStatus::NoExport;
122 _ => unimplemented!(),
128 pub fn assert_simple_bound(bound: &syn::TraitBound) {
129 if bound.paren_token.is_some() || bound.lifetimes.is_some() { unimplemented!(); }
130 if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
133 /// Returns true if the enum will be mapped as an opaue (ie struct with a pointer to the underlying
134 /// type), otherwise it is mapped into a transparent, C-compatible version of itself.
135 pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool {
136 for var in e.variants.iter() {
137 if let syn::Fields::Named(fields) = &var.fields {
138 for field in fields.named.iter() {
139 match export_status(&field.attrs) {
140 ExportStatus::Export|ExportStatus::TestOnly => {},
141 ExportStatus::NoExport => return true,
144 } else if let syn::Fields::Unnamed(fields) = &var.fields {
145 for field in fields.unnamed.iter() {
146 match export_status(&field.attrs) {
147 ExportStatus::Export|ExportStatus::TestOnly => {},
148 ExportStatus::NoExport => return true,
156 /// A stack of sets of generic resolutions.
158 /// This tracks the template parameters for a function, struct, or trait, allowing resolution into
159 /// a concrete type. By pushing a new context onto the stack, this can track a function's template
160 /// parameters inside of a generic struct or trait.
162 /// It maps both direct types as well as Deref<Target = X>, mapping them via the provided
163 /// TypeResolver's resolve_path function (ie traits map to the concrete jump table, structs to the
164 /// concrete C container struct, etc).
166 pub struct GenericTypes<'a, 'b> {
167 self_ty: Option<(String, &'a syn::Path)>,
168 parent: Option<&'b GenericTypes<'b, 'b>>,
169 typed_generics: HashMap<&'a syn::Ident, (String, Option<&'a syn::Path>)>,
171 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
172 pub fn new(self_ty: Option<(String, &'a syn::Path)>) -> Self {
173 Self { self_ty, parent: None, typed_generics: HashMap::new(), }
176 /// push a new context onto the stack, allowing for a new set of generics to be learned which
177 /// will override any lower contexts, but which will still fall back to resoltion via lower
179 pub fn push_ctx<'c>(&'c self) -> GenericTypes<'a, 'c> {
180 GenericTypes { self_ty: None, parent: Some(self), typed_generics: HashMap::new(), }
183 /// Learn the generics in generics in the current context, given a TypeResolver.
184 pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
185 // First learn simple generics...
186 for generic in generics.params.iter() {
188 syn::GenericParam::Type(type_param) => {
189 let mut non_lifetimes_processed = false;
190 for bound in type_param.bounds.iter() {
191 if let syn::TypeParamBound::Trait(trait_bound) = bound {
192 if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
193 match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
195 if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
197 assert_simple_bound(&trait_bound);
198 if let Some(mut path) = types.maybe_resolve_path(&trait_bound.path, None) {
199 if types.skip_path(&path) { continue; }
200 if path == "Sized" { continue; }
201 if non_lifetimes_processed { return false; }
202 non_lifetimes_processed = true;
203 let new_ident = if path != "std::ops::Deref" {
204 path = "crate::".to_string() + &path;
205 Some(&trait_bound.path)
207 self.typed_generics.insert(&type_param.ident, (path, new_ident));
208 } else { return false; }
215 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
216 if let Some(wh) = &generics.where_clause {
217 for pred in wh.predicates.iter() {
218 if let syn::WherePredicate::Type(t) = pred {
219 if let syn::Type::Path(p) = &t.bounded_ty {
220 if p.qself.is_some() { return false; }
221 if p.path.leading_colon.is_some() { return false; }
222 let mut p_iter = p.path.segments.iter();
223 if let Some(gen) = self.typed_generics.get_mut(&p_iter.next().unwrap().ident) {
224 if gen.0 != "std::ops::Deref" { return false; }
225 if &format!("{}", p_iter.next().unwrap().ident) != "Target" { return false; }
227 let mut non_lifetimes_processed = false;
228 for bound in t.bounds.iter() {
229 if let syn::TypeParamBound::Trait(trait_bound) = bound {
230 if let Some(id) = trait_bound.path.get_ident() {
231 if format!("{}", id) == "Sized" { continue; }
233 if non_lifetimes_processed { return false; }
234 non_lifetimes_processed = true;
235 assert_simple_bound(&trait_bound);
236 *gen = ("crate::".to_string() + &types.resolve_path(&trait_bound.path, None),
237 Some(&trait_bound.path));
240 } else { return false; }
241 } else { return false; }
245 for (_, (_, ident)) in self.typed_generics.iter() {
246 if ident.is_none() { return false; }
251 /// Learn the associated types from the trait in the current context.
252 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
253 for item in t.items.iter() {
255 &syn::TraitItem::Type(ref t) => {
256 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
257 let mut bounds_iter = t.bounds.iter();
258 match bounds_iter.next().unwrap() {
259 syn::TypeParamBound::Trait(tr) => {
260 assert_simple_bound(&tr);
261 if let Some(mut path) = types.maybe_resolve_path(&tr.path, None) {
262 if types.skip_path(&path) { continue; }
263 // In general we handle Deref<Target=X> as if it were just X (and
264 // implement Deref<Target=Self> for relevant types). We don't
265 // bother to implement it for associated types, however, so we just
266 // ignore such bounds.
267 let new_ident = if path != "std::ops::Deref" {
268 path = "crate::".to_string() + &path;
271 self.typed_generics.insert(&t.ident, (path, new_ident));
272 } else { unimplemented!(); }
274 _ => unimplemented!(),
276 if bounds_iter.next().is_some() { unimplemented!(); }
283 /// Attempt to resolve an Ident as a generic parameter and return the full path.
284 pub fn maybe_resolve_ident<'b>(&'b self, ident: &syn::Ident) -> Option<&'b String> {
285 if let Some(ty) = &self.self_ty {
286 if format!("{}", ident) == "Self" {
290 if let Some(res) = self.typed_generics.get(ident).map(|(a, _)| a) {
293 if let Some(parent) = self.parent {
294 parent.maybe_resolve_ident(ident)
299 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
301 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<(&'b String, &'a syn::Path)> {
302 if let Some(ident) = path.get_ident() {
303 if let Some(ty) = &self.self_ty {
304 if format!("{}", ident) == "Self" {
305 return Some((&ty.0, ty.1));
308 if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) {
312 // Associated types are usually specified as "Self::Generic", so we check for that
314 let mut it = path.segments.iter();
315 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
316 let ident = &it.next().unwrap().ident;
317 if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) {
322 if let Some(parent) = self.parent {
323 parent.maybe_resolve_path(path)
330 #[derive(Clone, PartialEq)]
331 // The type of declaration and the object itself
332 pub enum DeclType<'a> {
334 Trait(&'a syn::ItemTrait),
340 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
341 crate_name: &'mod_lifetime str,
342 dependencies: &'mod_lifetime HashSet<syn::Ident>,
343 module_path: &'mod_lifetime str,
344 imports: HashMap<syn::Ident, (String, syn::Path)>,
345 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
346 priv_modules: HashSet<syn::Ident>,
348 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
349 fn process_use_intern(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>,
350 u: &syn::UseTree, partial_path: &str, mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>) {
353 macro_rules! push_path {
354 ($ident: expr, $path_suffix: expr) => {
355 if partial_path == "" && format!("{}", $ident) == "super" {
356 let mut mod_iter = module_path.rsplitn(2, "::");
357 mod_iter.next().unwrap();
358 let super_mod = mod_iter.next().unwrap();
359 new_path = format!("{}{}", super_mod, $path_suffix);
360 assert_eq!(path.len(), 0);
361 for module in super_mod.split("::") {
362 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
364 } else if partial_path == "" && !dependencies.contains(&$ident) {
365 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
366 let crate_name_ident = format_ident!("{}", crate_name);
367 path.push(parse_quote!(#crate_name_ident));
369 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
372 path.push(parse_quote!(#ident));
376 syn::UseTree::Path(p) => {
377 push_path!(p.ident, "::");
378 Self::process_use_intern(crate_name, module_path, dependencies, imports, &p.tree, &new_path, path);
380 syn::UseTree::Name(n) => {
381 push_path!(n.ident, "");
382 imports.insert(n.ident.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
384 syn::UseTree::Group(g) => {
385 for i in g.items.iter() {
386 Self::process_use_intern(crate_name, module_path, dependencies, imports, i, partial_path, path.clone());
389 syn::UseTree::Rename(r) => {
390 push_path!(r.ident, "");
391 imports.insert(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
393 syn::UseTree::Glob(_) => {
394 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
399 fn process_use(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
400 if let syn::Visibility::Public(_) = u.vis {
401 // We actually only use these for #[cfg(fuzztarget)]
402 eprintln!("Ignoring pub(use) tree!");
405 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
406 Self::process_use_intern(crate_name, module_path, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
409 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
410 let ident = format_ident!("{}", id);
411 let path = parse_quote!(#ident);
412 imports.insert(ident, (id.to_owned(), path));
415 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 {
416 Self::from_borrowed_items(crate_name, dependencies, module_path, &contents.iter().map(|a| a).collect::<Vec<_>>())
418 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 {
419 let mut imports = HashMap::new();
420 // Add primitives to the "imports" list:
421 Self::insert_primitive(&mut imports, "bool");
422 Self::insert_primitive(&mut imports, "u64");
423 Self::insert_primitive(&mut imports, "u32");
424 Self::insert_primitive(&mut imports, "u16");
425 Self::insert_primitive(&mut imports, "u8");
426 Self::insert_primitive(&mut imports, "usize");
427 Self::insert_primitive(&mut imports, "str");
428 Self::insert_primitive(&mut imports, "String");
430 // These are here to allow us to print native Rust types in trait fn impls even if we don't
432 Self::insert_primitive(&mut imports, "Result");
433 Self::insert_primitive(&mut imports, "Vec");
434 Self::insert_primitive(&mut imports, "Option");
436 let mut declared = HashMap::new();
437 let mut priv_modules = HashSet::new();
439 for item in contents.iter() {
441 syn::Item::Use(u) => Self::process_use(crate_name, module_path, dependencies, &mut imports, &u),
442 syn::Item::Struct(s) => {
443 if let syn::Visibility::Public(_) = s.vis {
444 match export_status(&s.attrs) {
445 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported); },
446 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
447 ExportStatus::TestOnly => continue,
451 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
452 if let syn::Visibility::Public(_) = t.vis {
453 let mut process_alias = true;
454 for tok in t.generics.params.iter() {
455 if let syn::GenericParam::Lifetime(_) = tok {}
456 else { process_alias = false; }
459 declared.insert(t.ident.clone(), DeclType::StructImported);
463 syn::Item::Enum(e) => {
464 if let syn::Visibility::Public(_) = e.vis {
465 match export_status(&e.attrs) {
466 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored); },
467 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
472 syn::Item::Trait(t) if export_status(&t.attrs) == ExportStatus::Export => {
473 if let syn::Visibility::Public(_) = t.vis {
474 declared.insert(t.ident.clone(), DeclType::Trait(t));
477 syn::Item::Mod(m) => {
478 priv_modules.insert(m.ident.clone());
484 Self { crate_name, dependencies, module_path, imports, declared, priv_modules }
487 pub fn get_declared_type(&self, ident: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
488 self.declared.get(ident)
491 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
492 self.declared.get(id)
495 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
496 if let Some((imp, _)) = self.imports.get(id) {
498 } else if self.declared.get(id).is_some() {
499 Some(self.module_path.to_string() + "::" + &format!("{}", id))
503 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
504 if let Some((imp, _)) = self.imports.get(id) {
506 } else if let Some(decl_type) = self.declared.get(id) {
508 DeclType::StructIgnored => None,
509 _ => Some(self.module_path.to_string() + "::" + &format!("{}", id)),
514 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
515 let p = if let Some(gen_types) = generics {
516 if let Some((_, synpath)) = gen_types.maybe_resolve_path(p_arg) {
521 if p.leading_colon.is_some() {
522 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
523 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
525 let firstseg = p.segments.iter().next().unwrap();
526 if !self.dependencies.contains(&firstseg.ident) {
527 res = self.crate_name.to_owned() + "::" + &res;
530 } else if let Some(id) = p.get_ident() {
531 self.maybe_resolve_ident(id)
533 if p.segments.len() == 1 {
534 let seg = p.segments.iter().next().unwrap();
535 return self.maybe_resolve_ident(&seg.ident);
537 let mut seg_iter = p.segments.iter();
538 let first_seg = seg_iter.next().unwrap();
539 let remaining: String = seg_iter.map(|seg| {
540 format!("::{}", seg.ident)
542 let first_seg_str = format!("{}", first_seg.ident);
543 if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
545 Some(imp.clone() + &remaining)
549 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
550 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
551 } else if first_seg_str == "std" || first_seg_str == "core" || self.dependencies.contains(&first_seg.ident) {
552 Some(first_seg_str + &remaining)
557 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
558 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
560 syn::Type::Path(p) => {
561 eprintln!("rir {:?}", p);
562 if p.path.segments.len() != 1 { unimplemented!(); }
563 let mut args = p.path.segments[0].arguments.clone();
564 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
565 for arg in generics.args.iter_mut() {
566 if let syn::GenericArgument::Type(ref mut t) = arg {
567 *t = self.resolve_imported_refs(t.clone());
571 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
572 p.path = newpath.clone();
574 p.path.segments[0].arguments = args;
576 syn::Type::Reference(r) => {
577 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
579 syn::Type::Slice(s) => {
580 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
582 syn::Type::Tuple(t) => {
583 for e in t.elems.iter_mut() {
584 *e = self.resolve_imported_refs(e.clone());
587 _ => unimplemented!(),
593 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
594 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
595 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
596 // accomplish the same goals, so we just ignore it.
598 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
601 pub struct ASTModule {
602 pub attrs: Vec<syn::Attribute>,
603 pub items: Vec<syn::Item>,
604 pub submods: Vec<String>,
606 /// A struct containing the syn::File AST for each file in the crate.
607 pub struct FullLibraryAST {
608 pub modules: HashMap<String, ASTModule, NonRandomHash>,
609 pub dependencies: HashSet<syn::Ident>,
611 impl FullLibraryAST {
612 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
613 let mut non_mod_items = Vec::with_capacity(items.len());
614 let mut submods = Vec::with_capacity(items.len());
615 for item in items.drain(..) {
617 syn::Item::Mod(m) if m.content.is_some() => {
618 if export_status(&m.attrs) == ExportStatus::Export {
619 if let syn::Visibility::Public(_) = m.vis {
620 let modident = format!("{}", m.ident);
621 let modname = if module != "" {
622 module.clone() + "::" + &modident
626 self.load_module(modname, m.attrs, m.content.unwrap().1);
627 submods.push(modident);
629 non_mod_items.push(syn::Item::Mod(m));
633 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
634 syn::Item::ExternCrate(c) => {
635 if export_status(&c.attrs) == ExportStatus::Export {
636 self.dependencies.insert(c.ident);
639 _ => { non_mod_items.push(item); }
642 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
645 pub fn load_lib(lib: syn::File) -> Self {
646 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
647 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
648 res.load_module("".to_owned(), lib.attrs, lib.items);
653 /// List of manually-generated types which are clonable
654 fn initial_clonable_types() -> HashSet<String> {
655 let mut res = HashSet::new();
656 res.insert("crate::c_types::u5".to_owned());
660 /// Top-level struct tracking everything which has been defined while walking the crate.
661 pub struct CrateTypes<'a> {
662 /// This may contain structs or enums, but only when either is mapped as
663 /// struct X { inner: *mut originalX, .. }
664 pub opaques: HashMap<String, &'a syn::Ident>,
665 /// Enums which are mapped as C enums with conversion functions
666 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
667 /// Traits which are mapped as a pointer + jump table
668 pub traits: HashMap<String, &'a syn::ItemTrait>,
669 /// Aliases from paths to some other Type
670 pub type_aliases: HashMap<String, syn::Type>,
671 /// Value is an alias to Key (maybe with some generics)
672 pub reverse_alias_map: HashMap<String, Vec<(syn::Path, syn::PathArguments)>>,
673 /// Template continer types defined, map from mangled type name -> whether a destructor fn
676 /// This is used at the end of processing to make C++ wrapper classes
677 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
678 /// The output file for any created template container types, written to as we find new
679 /// template containers which need to be defined.
680 template_file: RefCell<&'a mut File>,
681 /// Set of containers which are clonable
682 clonable_types: RefCell<HashSet<String>>,
684 pub trait_impls: HashMap<String, Vec<String>>,
685 /// The full set of modules in the crate(s)
686 pub lib_ast: &'a FullLibraryAST,
689 impl<'a> CrateTypes<'a> {
690 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
692 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
693 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
694 templates_defined: RefCell::new(HashMap::default()),
695 clonable_types: RefCell::new(initial_clonable_types()), trait_impls: HashMap::new(),
696 template_file: RefCell::new(template_file), lib_ast: &libast,
699 pub fn set_clonable(&self, object: String) {
700 self.clonable_types.borrow_mut().insert(object);
702 pub fn is_clonable(&self, object: &str) -> bool {
703 self.clonable_types.borrow().contains(object)
705 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
706 self.template_file.borrow_mut().write(created_container).unwrap();
707 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
711 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
712 /// module but contains a reference to the overall CrateTypes tracking.
713 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
714 pub module_path: &'mod_lifetime str,
715 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
716 types: ImportResolver<'mod_lifetime, 'crate_lft>,
719 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
720 /// happen to get the inner value of a generic.
721 enum EmptyValExpectedTy {
722 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
724 /// A pointer that we want to dereference and move out of.
726 /// A pointer which we want to convert to a reference.
731 /// Describes the appropriate place to print a general type-conversion string when converting a
733 enum ContainerPrefixLocation {
734 /// Prints a general type-conversion string prefix and suffix outside of the
735 /// container-conversion strings.
737 /// Prints a general type-conversion string prefix and suffix inside of the
738 /// container-conversion strings.
740 /// Does not print the usual type-conversion string prefix and suffix.
744 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
745 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
746 Self { module_path, types, crate_types }
749 // *************************************************
750 // *** Well know type and conversion definitions ***
751 // *************************************************
753 /// Returns true we if can just skip passing this to C entirely
754 fn skip_path(&self, full_path: &str) -> bool {
755 full_path == "bitcoin::secp256k1::Secp256k1" ||
756 full_path == "bitcoin::secp256k1::Signing" ||
757 full_path == "bitcoin::secp256k1::Verification"
759 /// Returns true we if can just skip passing this to C entirely
760 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
761 if full_path == "bitcoin::secp256k1::Secp256k1" {
762 "secp256k1::SECP256K1"
763 } else { unimplemented!(); }
766 /// Returns true if the object is a primitive and is mapped as-is with no conversion
768 pub fn is_primitive(&self, full_path: &str) -> bool {
779 pub fn is_clonable(&self, ty: &str) -> bool {
780 if self.crate_types.is_clonable(ty) { return true; }
781 if self.is_primitive(ty) { return true; }
784 "crate::c_types::Signature" => true,
785 "crate::c_types::TxOut" => true,
789 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
790 /// ignored by for some reason need mapping anyway.
791 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
792 if self.is_primitive(full_path) {
793 return Some(full_path);
796 "Result" => Some("crate::c_types::derived::CResult"),
797 "Vec" if !is_ref => Some("crate::c_types::derived::CVec"),
798 "Option" => Some(""),
800 // Note that no !is_ref types can map to an array because Rust and C's call semantics
801 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
803 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
804 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes"),
805 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
806 "[u8; 10]" if !is_ref => Some("crate::c_types::TenBytes"),
807 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
808 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
810 "str" if is_ref => Some("crate::c_types::Str"),
811 "String" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
812 "String" if is_ref => Some("crate::c_types::Str"),
814 "std::time::Duration" => Some("u64"),
815 "std::io::Error" => Some("crate::c_types::IOError"),
817 "bech32::u5" => Some("crate::c_types::u5"),
819 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
820 => Some("crate::c_types::PublicKey"),
821 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature"),
822 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
823 if is_ref => Some("*const [u8; 32]"),
824 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
825 if !is_ref => Some("crate::c_types::SecretKey"),
826 "bitcoin::secp256k1::Error"|"secp256k1::Error"
827 if !is_ref => Some("crate::c_types::Secp256k1Error"),
828 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
829 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
830 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
831 "bitcoin::blockdata::transaction::Transaction" => Some("crate::c_types::Transaction"),
832 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
833 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
834 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
835 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
837 // Newtypes that we just expose in their original form.
838 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
839 if is_ref => Some("*const [u8; 32]"),
840 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
841 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
842 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
843 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("*const [u8; 32]"),
844 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
845 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("*const [u8; 32]"),
846 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
847 "lightning::ln::channelmanager::PaymentSecret" if is_ref => Some("crate::c_types::ThirtyTwoBytes"),
848 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
850 // Override the default since Records contain an fmt with a lifetime:
851 "lightning::util::logger::Record" => Some("*const std::os::raw::c_char"),
857 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
860 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
861 if self.is_primitive(full_path) {
862 return Some("".to_owned());
865 "Vec" if !is_ref => Some("local_"),
866 "Result" if !is_ref => Some("local_"),
867 "Option" if is_ref => Some("&local_"),
868 "Option" => Some("local_"),
870 "[u8; 32]" if is_ref => Some("unsafe { &*"),
871 "[u8; 32]" if !is_ref => Some(""),
872 "[u8; 20]" if !is_ref => Some(""),
873 "[u8; 16]" if !is_ref => Some(""),
874 "[u8; 10]" if !is_ref => Some(""),
875 "[u8; 4]" if !is_ref => Some(""),
876 "[u8; 3]" if !is_ref => Some(""),
878 "[u8]" if is_ref => Some(""),
879 "[usize]" if is_ref => Some(""),
881 "str" if is_ref => Some(""),
882 "String" if !is_ref => Some("String::from_utf8("),
883 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
884 // cannot create a &String.
886 "std::time::Duration" => Some("std::time::Duration::from_secs("),
888 "bech32::u5" => Some(""),
890 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
891 if is_ref => Some("&"),
892 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
894 "bitcoin::secp256k1::Signature" if is_ref => Some("&"),
895 "bitcoin::secp256k1::Signature" => Some(""),
896 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
897 if is_ref => Some("&::bitcoin::secp256k1::key::SecretKey::from_slice(&unsafe { *"),
898 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
899 if !is_ref => Some(""),
900 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
901 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
902 "bitcoin::blockdata::transaction::Transaction" if is_ref => Some("&"),
903 "bitcoin::blockdata::transaction::Transaction" => Some(""),
904 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
905 "bitcoin::network::constants::Network" => Some(""),
906 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
907 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
909 // Newtypes that we just expose in their original form.
910 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
911 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
912 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
913 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("::lightning::ln::channelmanager::PaymentHash("),
914 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("&::lightning::ln::channelmanager::PaymentHash(unsafe { *"),
915 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some("::lightning::ln::channelmanager::PaymentPreimage("),
916 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("&::lightning::ln::channelmanager::PaymentPreimage(unsafe { *"),
917 "lightning::ln::channelmanager::PaymentSecret" => Some("::lightning::ln::channelmanager::PaymentSecret("),
919 // List of traits we map (possibly during processing of other files):
920 "crate::util::logger::Logger" => Some(""),
923 }.map(|s| s.to_owned())
925 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
926 if self.is_primitive(full_path) {
927 return Some("".to_owned());
930 "Vec" if !is_ref => Some(""),
931 "Option" => Some(""),
932 "Result" if !is_ref => Some(""),
934 "[u8; 32]" if is_ref => Some("}"),
935 "[u8; 32]" if !is_ref => Some(".data"),
936 "[u8; 20]" if !is_ref => Some(".data"),
937 "[u8; 16]" if !is_ref => Some(".data"),
938 "[u8; 10]" if !is_ref => Some(".data"),
939 "[u8; 4]" if !is_ref => Some(".data"),
940 "[u8; 3]" if !is_ref => Some(".data"),
942 "[u8]" if is_ref => Some(".to_slice()"),
943 "[usize]" if is_ref => Some(".to_slice()"),
945 "str" if is_ref => Some(".into()"),
946 "String" if !is_ref => Some(".into_rust()).unwrap()"),
948 "std::time::Duration" => Some(")"),
950 "bech32::u5" => Some(".into()"),
952 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
953 => Some(".into_rust()"),
954 "bitcoin::secp256k1::Signature" => Some(".into_rust()"),
955 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
956 if !is_ref => Some(".into_rust()"),
957 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
958 if is_ref => Some("}[..]).unwrap()"),
959 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
960 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
961 "bitcoin::blockdata::transaction::Transaction" => Some(".into_bitcoin()"),
962 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
963 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
964 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
965 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
967 // Newtypes that we just expose in their original form.
968 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
969 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
970 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
971 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some(".data)"),
972 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some(" })"),
973 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some(".data)"),
974 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some(" })"),
975 "lightning::ln::channelmanager::PaymentSecret" => Some(".data)"),
977 // List of traits we map (possibly during processing of other files):
978 "crate::util::logger::Logger" => Some(""),
981 }.map(|s| s.to_owned())
984 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
985 if self.is_primitive(full_path) {
989 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
990 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
992 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
993 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
994 "bitcoin::hash_types::Txid" => None,
996 // Override the default since Records contain an fmt with a lifetime:
997 // TODO: We should include the other record fields
998 "lightning::util::logger::Record" => Some(("std::ffi::CString::new(format!(\"{}\", ", ".args)).unwrap()")),
1000 }.map(|s| s.to_owned())
1002 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1003 if self.is_primitive(full_path) {
1004 return Some("".to_owned());
1007 "Result" if !is_ref => Some("local_"),
1008 "Vec" if !is_ref => Some("local_"),
1009 "Option" => Some("local_"),
1011 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1012 "[u8; 32]" if is_ref => Some(""),
1013 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes { data: "),
1014 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
1015 "[u8; 10]" if !is_ref => Some("crate::c_types::TenBytes { data: "),
1016 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
1017 "[u8; 3]" if is_ref => Some(""),
1019 "[u8]" if is_ref => Some("local_"),
1020 "[usize]" if is_ref => Some("local_"),
1022 "str" if is_ref => Some(""),
1023 "String" => Some(""),
1025 "std::time::Duration" => Some(""),
1026 "std::io::Error" if !is_ref => Some("crate::c_types::IOError::from_rust("),
1028 "bech32::u5" => Some(""),
1030 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
1031 => Some("crate::c_types::PublicKey::from_rust(&"),
1032 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature::from_rust(&"),
1033 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1034 if is_ref => Some(""),
1035 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1036 if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
1037 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1038 if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
1039 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
1040 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
1041 "bitcoin::blockdata::transaction::Transaction" if is_ref => Some("crate::c_types::Transaction::from_bitcoin("),
1042 "bitcoin::blockdata::transaction::Transaction" => Some("crate::c_types::Transaction::from_bitcoin(&"),
1043 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
1044 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
1045 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1046 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1047 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1049 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1051 // Newtypes that we just expose in their original form.
1052 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1053 if is_ref => Some(""),
1054 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1055 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1056 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1057 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("&"),
1058 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1059 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("&"),
1060 "lightning::ln::channelmanager::PaymentPreimage" => Some("crate::c_types::ThirtyTwoBytes { data: "),
1061 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1063 // Override the default since Records contain an fmt with a lifetime:
1064 "lightning::util::logger::Record" => Some("local_"),
1067 }.map(|s| s.to_owned())
1069 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1070 if self.is_primitive(full_path) {
1071 return Some("".to_owned());
1074 "Result" if !is_ref => Some(""),
1075 "Vec" if !is_ref => Some(".into()"),
1076 "Option" => Some(""),
1078 "[u8; 32]" if !is_ref => Some(" }"),
1079 "[u8; 32]" if is_ref => Some(""),
1080 "[u8; 20]" if !is_ref => Some(" }"),
1081 "[u8; 16]" if !is_ref => Some(" }"),
1082 "[u8; 10]" if !is_ref => Some(" }"),
1083 "[u8; 4]" if !is_ref => Some(" }"),
1084 "[u8; 3]" if is_ref => Some(""),
1086 "[u8]" if is_ref => Some(""),
1087 "[usize]" if is_ref => Some(""),
1089 "str" if is_ref => Some(".into()"),
1090 "String" if !is_ref => Some(".into_bytes().into()"),
1091 "String" if is_ref => Some(".as_str().into()"),
1093 "std::time::Duration" => Some(".as_secs()"),
1094 "std::io::Error" if !is_ref => Some(")"),
1096 "bech32::u5" => Some(".into()"),
1098 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
1100 "bitcoin::secp256k1::Signature" => Some(")"),
1101 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1102 if !is_ref => Some(")"),
1103 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1104 if is_ref => Some(".as_ref()"),
1105 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1106 if !is_ref => Some(")"),
1107 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1108 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1109 "bitcoin::blockdata::transaction::Transaction" => Some(")"),
1110 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1111 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1112 "bitcoin::network::constants::Network" => Some(")"),
1113 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1114 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1116 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1118 // Newtypes that we just expose in their original form.
1119 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1120 if is_ref => Some(".as_inner()"),
1121 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1122 if !is_ref => Some(".into_inner() }"),
1123 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1124 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some(".0"),
1125 "lightning::ln::channelmanager::PaymentHash" => Some(".0 }"),
1126 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some(".0"),
1127 "lightning::ln::channelmanager::PaymentPreimage" => Some(".0 }"),
1128 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some(".0 }"),
1130 // Override the default since Records contain an fmt with a lifetime:
1131 "lightning::util::logger::Record" => Some(".as_ptr()"),
1134 }.map(|s| s.to_owned())
1137 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1139 "lightning::ln::channelmanager::PaymentSecret" => Some(".data == [0; 32]"),
1140 "secp256k1::key::PublicKey"|"bitcoin::secp256k1::key::PublicKey" => Some(".is_null()"),
1141 "bitcoin::secp256k1::Signature" => Some(".is_null()"),
1146 // ****************************
1147 // *** Container Processing ***
1148 // ****************************
1150 /// Returns the module path in the generated mapping crate to the containers which we generate
1151 /// when writing to CrateTypes::template_file.
1152 pub fn generated_container_path() -> &'static str {
1153 "crate::c_types::derived"
1155 /// Returns the module path in the generated mapping crate to the container templates, which
1156 /// are then concretized and put in the generated container path/template_file.
1157 fn container_templ_path() -> &'static str {
1161 /// Returns true if the path containing the given args is a "transparent" container, ie an
1162 /// Option or a container which does not require a generated continer class.
1163 fn is_transparent_container<'i, I: Iterator<Item=&'i syn::Type>>(&self, full_path: &str, _is_ref: bool, mut args: I) -> bool {
1164 if full_path == "Option" {
1165 let inner = args.next().unwrap();
1166 assert!(args.next().is_none());
1168 syn::Type::Reference(_) => true,
1169 syn::Type::Path(p) => {
1170 if let Some(resolved) = self.maybe_resolve_path(&p.path, None) {
1171 if self.is_primitive(&resolved) { false } else { true }
1174 syn::Type::Tuple(_) => false,
1175 _ => unimplemented!(),
1179 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1180 /// not require a generated continer class.
1181 fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1182 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1183 syn::PathArguments::None => return false,
1184 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1185 if let syn::GenericArgument::Type(ref ty) = arg {
1187 } else { unimplemented!() }
1189 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1191 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter)
1193 /// Returns true if this is a known, supported, non-transparent container.
1194 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1195 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1197 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)
1198 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1199 // expecting one element in the vec per generic type, each of which is inline-converted
1200 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1202 "Result" if !is_ref => {
1204 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1205 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1206 ").into() }", ContainerPrefixLocation::PerConv))
1208 "Vec" if !is_ref => {
1209 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1212 // We should only get here if the single contained has an inner
1213 assert!(self.c_type_has_inner(single_contained.unwrap()));
1214 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "*item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1217 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "*item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1220 if let Some(syn::Type::Path(p)) = single_contained {
1221 let inner_path = self.resolve_path(&p.path, generics);
1222 if self.is_primitive(&inner_path) {
1223 return Some(("if ", vec![
1224 (format!(".is_none() {{ {}::COption_{}Z::None }} else {{ ", Self::generated_container_path(), inner_path),
1225 format!("{}::COption_{}Z::Some({}.unwrap())", Self::generated_container_path(), inner_path, var_access))
1226 ], " }", ContainerPrefixLocation::NoPrefix));
1227 } else if self.c_type_has_inner_from_path(&inner_path) {
1229 return Some(("if ", vec![
1230 (".is_none() { std::ptr::null() } else { ".to_owned(), format!("({}.as_ref().unwrap())", var_access))
1231 ], " }", ContainerPrefixLocation::OutsideConv));
1233 return Some(("if ", vec![
1234 (".is_none() { std::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1235 ], " }", ContainerPrefixLocation::OutsideConv));
1239 if let Some(t) = single_contained {
1240 let mut v = Vec::new();
1241 self.write_empty_rust_val(generics, &mut v, t);
1242 let s = String::from_utf8(v).unwrap();
1243 return Some(("if ", vec![
1244 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1245 ], " }", ContainerPrefixLocation::PerConv));
1246 } else { unreachable!(); }
1252 /// only_contained_has_inner implies that there is only one contained element in the container
1253 /// and it has an inner field (ie is an "opaque" type we've defined).
1254 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)
1255 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1256 // expecting one element in the vec per generic type, each of which is inline-converted
1257 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1259 "Result" if !is_ref => {
1261 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1262 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1263 ")}", ContainerPrefixLocation::PerConv))
1265 "Slice" if is_ref => {
1266 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1269 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1272 if let Some(syn::Type::Path(p)) = single_contained {
1273 let inner_path = self.resolve_path(&p.path, generics);
1274 if self.is_primitive(&inner_path) {
1275 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1276 } else if self.c_type_has_inner_from_path(&inner_path) {
1278 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1280 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1285 if let Some(t) = single_contained {
1287 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_) => {
1288 let mut v = Vec::new();
1289 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1290 let s = String::from_utf8(v).unwrap();
1292 EmptyValExpectedTy::ReferenceAsPointer =>
1293 return Some(("if ", vec![
1294 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1295 ], ") }", ContainerPrefixLocation::NoPrefix)),
1296 EmptyValExpectedTy::OwnedPointer => {
1297 if let syn::Type::Slice(_) = t {
1300 return Some(("if ", vec![
1301 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ *Box::from_raw({}) }}", var_access))
1302 ], ") }", ContainerPrefixLocation::NoPrefix));
1304 EmptyValExpectedTy::NonPointer =>
1305 return Some(("if ", vec![
1306 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1307 ], ") }", ContainerPrefixLocation::PerConv)),
1310 syn::Type::Tuple(_) => {
1311 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1313 _ => unimplemented!(),
1315 } else { unreachable!(); }
1321 // *************************************************
1322 // *** Type definition during main.rs processing ***
1323 // *************************************************
1325 pub fn get_declared_type(&'a self, ident: &syn::Ident) -> Option<&'a DeclType<'c>> {
1326 self.types.get_declared_type(ident)
1328 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1329 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool {
1330 self.crate_types.opaques.get(full_path).is_some()
1332 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1333 pub fn c_type_has_inner(&self, ty: &syn::Type) -> bool {
1335 syn::Type::Path(p) => {
1336 let full_path = self.resolve_path(&p.path, None);
1337 self.c_type_has_inner_from_path(&full_path)
1343 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1344 self.types.maybe_resolve_ident(id)
1347 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
1348 self.types.maybe_resolve_non_ignored_ident(id)
1351 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1352 self.types.maybe_resolve_path(p_arg, generics)
1354 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1355 self.maybe_resolve_path(p, generics).unwrap()
1358 // ***********************************
1359 // *** Original Rust Type Printing ***
1360 // ***********************************
1362 fn in_rust_prelude(resolved_path: &str) -> bool {
1363 match resolved_path {
1371 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path) {
1372 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1373 if self.is_primitive(&resolved) {
1374 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1376 // TODO: We should have a generic "is from a dependency" check here instead of
1377 // checking for "bitcoin" explicitly.
1378 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1379 write!(w, "{}", resolved).unwrap();
1380 // If we're printing a generic argument, it needs to reference the crate, otherwise
1381 // the original crate:
1382 } else if self.maybe_resolve_path(&path, None).as_ref() == Some(&resolved) {
1383 write!(w, "{}", resolved).unwrap();
1385 write!(w, "crate::{}", resolved).unwrap();
1388 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1389 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1392 if path.leading_colon.is_some() {
1393 write!(w, "::").unwrap();
1395 for (idx, seg) in path.segments.iter().enumerate() {
1396 if idx != 0 { write!(w, "::").unwrap(); }
1397 write!(w, "{}", seg.ident).unwrap();
1398 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1399 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1404 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>) {
1405 let mut had_params = false;
1406 for (idx, arg) in generics.enumerate() {
1407 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1410 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1411 syn::GenericParam::Type(t) => {
1412 write!(w, "{}", t.ident).unwrap();
1413 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1414 for (idx, bound) in t.bounds.iter().enumerate() {
1415 if idx != 0 { write!(w, " + ").unwrap(); }
1417 syn::TypeParamBound::Trait(tb) => {
1418 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1419 self.write_rust_path(w, generics_resolver, &tb.path);
1421 _ => unimplemented!(),
1424 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1426 _ => unimplemented!(),
1429 if had_params { write!(w, ">").unwrap(); }
1432 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>) {
1433 write!(w, "<").unwrap();
1434 for (idx, arg) in generics.enumerate() {
1435 if idx != 0 { write!(w, ", ").unwrap(); }
1437 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t),
1438 _ => unimplemented!(),
1441 write!(w, ">").unwrap();
1443 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
1445 syn::Type::Path(p) => {
1446 if p.qself.is_some() {
1449 self.write_rust_path(w, generics, &p.path);
1451 syn::Type::Reference(r) => {
1452 write!(w, "&").unwrap();
1453 if let Some(lft) = &r.lifetime {
1454 write!(w, "'{} ", lft.ident).unwrap();
1456 if r.mutability.is_some() {
1457 write!(w, "mut ").unwrap();
1459 self.write_rust_type(w, generics, &*r.elem);
1461 syn::Type::Array(a) => {
1462 write!(w, "[").unwrap();
1463 self.write_rust_type(w, generics, &a.elem);
1464 if let syn::Expr::Lit(l) = &a.len {
1465 if let syn::Lit::Int(i) = &l.lit {
1466 write!(w, "; {}]", i).unwrap();
1467 } else { unimplemented!(); }
1468 } else { unimplemented!(); }
1470 syn::Type::Slice(s) => {
1471 write!(w, "[").unwrap();
1472 self.write_rust_type(w, generics, &s.elem);
1473 write!(w, "]").unwrap();
1475 syn::Type::Tuple(s) => {
1476 write!(w, "(").unwrap();
1477 for (idx, t) in s.elems.iter().enumerate() {
1478 if idx != 0 { write!(w, ", ").unwrap(); }
1479 self.write_rust_type(w, generics, &t);
1481 write!(w, ")").unwrap();
1483 _ => unimplemented!(),
1487 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1488 /// unint'd memory).
1489 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1491 syn::Type::Path(p) => {
1492 let resolved = self.resolve_path(&p.path, generics);
1493 if self.crate_types.opaques.get(&resolved).is_some() {
1494 write!(w, "crate::{} {{ inner: std::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1496 // Assume its a manually-mapped C type, where we can just define an null() fn
1497 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1500 syn::Type::Array(a) => {
1501 if let syn::Expr::Lit(l) = &a.len {
1502 if let syn::Lit::Int(i) = &l.lit {
1503 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1504 // Blindly assume that if we're trying to create an empty value for an
1505 // array < 32 entries that all-0s may be a valid state.
1508 let arrty = format!("[u8; {}]", i.base10_digits());
1509 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1510 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1511 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1512 } else { unimplemented!(); }
1513 } else { unimplemented!(); }
1515 _ => unimplemented!(),
1519 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1520 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1521 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1522 let mut split = real_ty.split("; ");
1523 split.next().unwrap();
1524 let tail_str = split.next().unwrap();
1525 assert!(split.next().is_none());
1526 let len = usize::from_str_radix(&tail_str[..tail_str.len() - 1], 10).unwrap();
1527 Some(parse_quote!([u8; #len]))
1532 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1533 /// See EmptyValExpectedTy for information on return types.
1534 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1536 syn::Type::Path(p) => {
1537 let resolved = self.resolve_path(&p.path, generics);
1538 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1539 write!(w, ".data").unwrap();
1540 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1542 if self.crate_types.opaques.get(&resolved).is_some() {
1543 write!(w, ".inner.is_null()").unwrap();
1544 EmptyValExpectedTy::NonPointer
1546 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1547 write!(w, "{}", suffix).unwrap();
1548 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1549 EmptyValExpectedTy::NonPointer
1551 write!(w, " == std::ptr::null_mut()").unwrap();
1552 EmptyValExpectedTy::OwnedPointer
1556 syn::Type::Array(a) => {
1557 if let syn::Expr::Lit(l) = &a.len {
1558 if let syn::Lit::Int(i) = &l.lit {
1559 write!(w, " == [0; {}]", i.base10_digits()).unwrap();
1560 EmptyValExpectedTy::NonPointer
1561 } else { unimplemented!(); }
1562 } else { unimplemented!(); }
1564 syn::Type::Slice(_) => {
1565 // Option<[]> always implies that we want to treat len() == 0 differently from
1566 // None, so we always map an Option<[]> into a pointer.
1567 write!(w, " == std::ptr::null_mut()").unwrap();
1568 EmptyValExpectedTy::ReferenceAsPointer
1570 _ => unimplemented!(),
1574 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1575 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
1577 syn::Type::Path(_) => {
1578 write!(w, "{}", var_access).unwrap();
1579 self.write_empty_rust_val_check_suffix(generics, w, t);
1581 syn::Type::Array(a) => {
1582 if let syn::Expr::Lit(l) = &a.len {
1583 if let syn::Lit::Int(i) = &l.lit {
1584 let arrty = format!("[u8; {}]", i.base10_digits());
1585 // We don't (yet) support a new-var conversion here.
1586 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
1588 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
1590 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
1591 self.write_empty_rust_val_check_suffix(generics, w, t);
1592 } else { unimplemented!(); }
1593 } else { unimplemented!(); }
1595 _ => unimplemented!(),
1599 // ********************************
1600 // *** Type conversion printing ***
1601 // ********************************
1603 /// Returns true we if can just skip passing this to C entirely
1604 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
1606 syn::Type::Path(p) => {
1607 if p.qself.is_some() { unimplemented!(); }
1608 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1609 self.skip_path(&full_path)
1612 syn::Type::Reference(r) => {
1613 self.skip_arg(&*r.elem, generics)
1618 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1620 syn::Type::Path(p) => {
1621 if p.qself.is_some() { unimplemented!(); }
1622 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1623 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
1626 syn::Type::Reference(r) => {
1627 self.no_arg_to_rust(w, &*r.elem, generics);
1633 fn write_conversion_inline_intern<W: std::io::Write,
1634 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool, Option<&str>) -> String>
1635 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
1636 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
1638 syn::Type::Reference(r) => {
1639 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
1640 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1642 syn::Type::Path(p) => {
1643 if p.qself.is_some() {
1647 let resolved_path = self.resolve_path(&p.path, generics);
1648 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1649 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1650 } else if self.is_primitive(&resolved_path) {
1651 if is_ref && prefix {
1652 write!(w, "*").unwrap();
1654 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
1655 write!(w, "{}", c_type).unwrap();
1656 } else if self.crate_types.opaques.get(&resolved_path).is_some() {
1657 decl_lookup(w, &DeclType::StructImported, &resolved_path, is_ref, is_mut);
1658 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
1659 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
1660 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
1661 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
1662 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
1663 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
1664 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
1665 } else { unimplemented!(); }
1666 } else { unimplemented!(); }
1668 syn::Type::Array(a) => {
1669 // We assume all arrays contain only [int_literal; X]s.
1670 // This may result in some outputs not compiling.
1671 if let syn::Expr::Lit(l) = &a.len {
1672 if let syn::Lit::Int(i) = &l.lit {
1673 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
1674 } else { unimplemented!(); }
1675 } else { unimplemented!(); }
1677 syn::Type::Slice(s) => {
1678 // We assume all slices contain only literals or references.
1679 // This may result in some outputs not compiling.
1680 if let syn::Type::Path(p) = &*s.elem {
1681 let resolved = self.resolve_path(&p.path, generics);
1682 assert!(self.is_primitive(&resolved));
1683 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
1684 } else if let syn::Type::Reference(r) = &*s.elem {
1685 if let syn::Type::Path(p) = &*r.elem {
1686 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)), None)).unwrap();
1687 } else { unimplemented!(); }
1688 } else if let syn::Type::Tuple(t) = &*s.elem {
1689 assert!(!t.elems.is_empty());
1691 write!(w, "{}", sliceconv(false, None)).unwrap();
1693 let mut needs_map = false;
1694 for e in t.elems.iter() {
1695 if let syn::Type::Reference(_) = e {
1700 let mut map_str = Vec::new();
1701 write!(&mut map_str, ".map(|(").unwrap();
1702 for i in 0..t.elems.len() {
1703 write!(&mut map_str, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
1705 write!(&mut map_str, ")| (").unwrap();
1706 for (idx, e) in t.elems.iter().enumerate() {
1707 if let syn::Type::Reference(_) = e {
1708 write!(&mut map_str, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1709 } else if let syn::Type::Path(_) = e {
1710 write!(&mut map_str, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1711 } else { unimplemented!(); }
1713 write!(&mut map_str, "))").unwrap();
1714 write!(w, "{}", sliceconv(false, Some(&String::from_utf8(map_str).unwrap()))).unwrap();
1716 write!(w, "{}", sliceconv(false, None)).unwrap();
1719 } else { unimplemented!(); }
1721 syn::Type::Tuple(t) => {
1722 if t.elems.is_empty() {
1723 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
1724 // so work around it by just pretending its a 0u8
1725 write!(w, "{}", tupleconv).unwrap();
1727 if prefix { write!(w, "local_").unwrap(); }
1730 _ => unimplemented!(),
1734 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) {
1735 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "0u8 /*", true, |_, _| "local_".to_owned(),
1736 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
1737 |w, decl_type, decl_path, is_ref, _is_mut| {
1739 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(", decl_path).unwrap(),
1740 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(", decl_path).unwrap(),
1741 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
1742 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref && from_ptr =>
1743 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap(),
1744 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref =>
1745 write!(w, "crate::{} {{ inner: unsafe {{ ( (&(*", decl_path).unwrap(),
1746 DeclType::EnumIgnored|DeclType::StructImported if is_ref =>
1747 write!(w, "&crate::{} {{ inner: unsafe {{ (", decl_path).unwrap(),
1748 DeclType::EnumIgnored|DeclType::StructImported if !is_ref && from_ptr =>
1749 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
1750 DeclType::EnumIgnored|DeclType::StructImported if !is_ref =>
1751 write!(w, "crate::{} {{ inner: Box::into_raw(Box::new(", decl_path).unwrap(),
1752 DeclType::Trait(_) if is_ref => write!(w, "").unwrap(),
1753 DeclType::Trait(_) if !is_ref => {},
1754 _ => panic!("{:?}", decl_path),
1758 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) {
1759 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
1761 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) {
1762 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_, _| ".into()".to_owned(),
1763 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
1764 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1765 DeclType::MirroredEnum => write!(w, ")").unwrap(),
1766 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref && from_ptr =>
1767 write!(w, " as *const _) as *mut _ }}, is_owned: false }}").unwrap(),
1768 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref =>
1769 write!(w, ") as *const _) as *mut _) }}, is_owned: false }}").unwrap(),
1770 DeclType::EnumIgnored|DeclType::StructImported if is_ref =>
1771 write!(w, " as *const _) as *mut _ }}, is_owned: false }}").unwrap(),
1772 DeclType::EnumIgnored|DeclType::StructImported if !is_ref && from_ptr =>
1773 write!(w, ", is_owned: true }}").unwrap(),
1774 DeclType::EnumIgnored|DeclType::StructImported if !is_ref => write!(w, ")), is_owned: true }}").unwrap(),
1775 DeclType::Trait(_) if is_ref => {},
1776 DeclType::Trait(_) => {
1777 // This is used when we're converting a concrete Rust type into a C trait
1778 // for use when a Rust trait method returns an associated type.
1779 // Because all of our C traits implement From<RustTypesImplementingTraits>
1780 // we can just call .into() here and be done.
1781 write!(w, ".into()").unwrap()
1783 _ => unimplemented!(),
1786 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) {
1787 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
1790 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) {
1791 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_, _| "&local_".to_owned(),
1792 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
1793 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
1794 DeclType::StructImported if is_ref && ptr_for_ref => write!(w, "unsafe {{ &*(*").unwrap(),
1795 DeclType::StructImported if is_mut && is_ref => write!(w, "unsafe {{ &mut *").unwrap(),
1796 DeclType::StructImported if is_ref => write!(w, "unsafe {{ &*").unwrap(),
1797 DeclType::StructImported if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
1798 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
1799 DeclType::MirroredEnum => {},
1800 DeclType::Trait(_) => {},
1801 _ => unimplemented!(),
1804 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1805 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
1807 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) {
1808 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
1809 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
1810 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
1811 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
1812 (true, None) => "[..]".to_owned(),
1813 (true, Some(_)) => unreachable!(),
1815 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
1816 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1817 DeclType::StructImported if is_ref && ptr_for_ref => write!(w, ").inner }}").unwrap(),
1818 DeclType::StructImported if is_ref => write!(w, ".inner }}").unwrap(),
1819 DeclType::StructImported if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
1820 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
1821 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
1822 DeclType::Trait(_) => {},
1823 _ => unimplemented!(),
1826 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1827 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
1829 // Note that compared to the above conversion functions, the following two are generally
1830 // significantly undertested:
1831 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1832 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_, _| "&local_".to_owned(),
1834 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
1835 Some(format!("&{}", conv))
1838 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1839 DeclType::StructImported if !is_ref => write!(w, "unsafe {{ &*").unwrap(),
1840 _ => unimplemented!(),
1843 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1844 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
1845 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
1846 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
1847 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
1848 (true, None) => "[..]".to_owned(),
1849 (true, Some(_)) => unreachable!(),
1851 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
1852 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1853 DeclType::StructImported if !is_ref => write!(w, ".inner }}").unwrap(),
1854 _ => unimplemented!(),
1858 fn write_conversion_new_var_intern<'b, W: std::io::Write,
1859 LP: Fn(&str, bool) -> Option<(&str, &str)>,
1860 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
1861 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
1862 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
1863 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
1864 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool,
1865 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
1867 macro_rules! convert_container {
1868 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
1869 // For slices (and Options), we refuse to directly map them as is_ref when they
1870 // aren't opaque types containing an inner pointer. This is due to the fact that,
1871 // in both cases, the actual higher-level type is non-is_ref.
1872 let ty_has_inner = if $args_len == 1 {
1873 let ty = $args_iter().next().unwrap();
1874 if $container_type == "Slice" && to_c {
1875 // "To C ptr_for_ref" means "return the regular object with is_owned
1876 // set to false", which is totally what we want in a slice if we're about to
1877 // set ty_has_inner.
1880 if let syn::Type::Reference(t) = ty {
1881 if let syn::Type::Path(p) = &*t.elem {
1882 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
1884 } else if let syn::Type::Path(p) = ty {
1885 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
1889 // Options get a bunch of special handling, since in general we map Option<>al
1890 // types into the same C type as non-Option-wrapped types. This ends up being
1891 // pretty manual here and most of the below special-cases are for Options.
1892 let mut needs_ref_map = false;
1893 let mut only_contained_type = None;
1894 let mut only_contained_has_inner = false;
1895 let mut contains_slice = false;
1897 only_contained_has_inner = ty_has_inner;
1898 let arg = $args_iter().next().unwrap();
1899 if let syn::Type::Reference(t) = arg {
1900 only_contained_type = Some(&*t.elem);
1901 if let syn::Type::Path(_) = &*t.elem {
1903 } else if let syn::Type::Slice(_) = &*t.elem {
1904 contains_slice = true;
1905 } else { return false; }
1906 // If the inner element contains an inner pointer, we will just use that,
1907 // avoiding the need to map elements to references. Otherwise we'll need to
1908 // do an extra mapping step.
1909 needs_ref_map = !only_contained_has_inner;
1911 only_contained_type = Some(&arg);
1915 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref && ty_has_inner, only_contained_type, ident, var) {
1916 assert_eq!(conversions.len(), $args_len);
1917 write!(w, "let mut local_{}{} = ", ident, if !to_c && needs_ref_map {"_base"} else { "" }).unwrap();
1918 if prefix_location == ContainerPrefixLocation::OutsideConv {
1919 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
1921 write!(w, "{}{}", prefix, var).unwrap();
1923 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
1924 let mut var = std::io::Cursor::new(Vec::new());
1925 write!(&mut var, "{}", var_name).unwrap();
1926 let var_access = String::from_utf8(var.into_inner()).unwrap();
1928 let conv_ty = if needs_ref_map { only_contained_type.as_ref().unwrap() } else { ty };
1930 write!(w, "{} {{ ", pfx).unwrap();
1931 let new_var_name = format!("{}_{}", ident, idx);
1932 let new_var = self.write_conversion_new_var_intern(w, &format_ident!("{}", new_var_name),
1933 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix);
1934 if new_var { write!(w, " ").unwrap(); }
1936 if prefix_location == ContainerPrefixLocation::PerConv {
1937 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
1938 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
1939 write!(w, "Box::into_raw(Box::new(").unwrap();
1942 write!(w, "{}{}", if contains_slice { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
1943 if prefix_location == ContainerPrefixLocation::PerConv {
1944 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
1945 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
1946 write!(w, "))").unwrap();
1948 write!(w, " }}").unwrap();
1950 write!(w, "{}", suffix).unwrap();
1951 if prefix_location == ContainerPrefixLocation::OutsideConv {
1952 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
1954 write!(w, ";").unwrap();
1955 if !to_c && needs_ref_map {
1956 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
1958 write!(w, ".map(|a| &a[..])").unwrap();
1960 write!(w, ";").unwrap();
1968 syn::Type::Reference(r) => {
1969 if let syn::Type::Slice(_) = &*r.elem {
1970 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, is_ref, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix)
1972 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, true, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix)
1975 syn::Type::Path(p) => {
1976 if p.qself.is_some() {
1979 let resolved_path = self.resolve_path(&p.path, generics);
1980 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1981 return self.write_conversion_new_var_intern(w, ident, var, aliased_type, None, is_ref, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix);
1983 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
1984 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
1985 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
1986 if let syn::GenericArgument::Type(ty) = arg {
1988 } else { unimplemented!(); }
1990 } else { unimplemented!(); }
1992 if self.is_primitive(&resolved_path) {
1994 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
1995 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
1996 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
1998 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
2003 syn::Type::Array(_) => {
2004 // We assume all arrays contain only primitive types.
2005 // This may result in some outputs not compiling.
2008 syn::Type::Slice(s) => {
2009 if let syn::Type::Path(p) = &*s.elem {
2010 let resolved = self.resolve_path(&p.path, generics);
2011 assert!(self.is_primitive(&resolved));
2012 let slice_path = format!("[{}]", resolved);
2013 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
2014 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2017 } else if let syn::Type::Reference(ty) = &*s.elem {
2018 let tyref = [&*ty.elem];
2020 convert_container!("Slice", 1, || tyref.iter().map(|t| *t));
2021 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2022 } else if let syn::Type::Tuple(t) = &*s.elem {
2023 // When mapping into a temporary new var, we need to own all the underlying objects.
2024 // Thus, we drop any references inside the tuple and convert with non-reference types.
2025 let mut elems = syn::punctuated::Punctuated::new();
2026 for elem in t.elems.iter() {
2027 if let syn::Type::Reference(r) = elem {
2028 elems.push((*r.elem).clone());
2030 elems.push(elem.clone());
2033 let ty = [syn::Type::Tuple(syn::TypeTuple {
2034 paren_token: t.paren_token, elems
2038 convert_container!("Slice", 1, || ty.iter());
2039 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2040 } else { unimplemented!() }
2042 syn::Type::Tuple(t) => {
2043 if !t.elems.is_empty() {
2044 // We don't (yet) support tuple elements which cannot be converted inline
2045 write!(w, "let (").unwrap();
2046 for idx in 0..t.elems.len() {
2047 if idx != 0 { write!(w, ", ").unwrap(); }
2048 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
2050 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
2051 // Like other template types, tuples are always mapped as their non-ref
2052 // versions for types which have different ref mappings. Thus, we convert to
2053 // non-ref versions and handle opaque types with inner pointers manually.
2054 for (idx, elem) in t.elems.iter().enumerate() {
2055 if let syn::Type::Path(p) = elem {
2056 let v_name = format!("orig_{}_{}", ident, idx);
2057 let tuple_elem_ident = format_ident!("{}", &v_name);
2058 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
2059 false, ptr_for_ref, to_c,
2060 path_lookup, container_lookup, var_prefix, var_suffix) {
2061 write!(w, " ").unwrap();
2062 // Opaque types with inner pointers shouldn't ever create new stack
2063 // variables, so we don't handle it and just assert that it doesn't
2065 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
2069 write!(w, "let mut local_{} = (", ident).unwrap();
2070 for (idx, elem) in t.elems.iter().enumerate() {
2071 let ty_has_inner = {
2073 // "To C ptr_for_ref" means "return the regular object with
2074 // is_owned set to false", which is totally what we want
2075 // if we're about to set ty_has_inner.
2078 if let syn::Type::Reference(t) = elem {
2079 if let syn::Type::Path(p) = &*t.elem {
2080 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2082 } else if let syn::Type::Path(p) = elem {
2083 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2086 if idx != 0 { write!(w, ", ").unwrap(); }
2087 var_prefix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2088 if is_ref && ty_has_inner {
2089 // For ty_has_inner, the regular var_prefix mapping will take a
2090 // reference, so deref once here to make sure we keep the original ref.
2091 write!(w, "*").unwrap();
2093 write!(w, "orig_{}_{}", ident, idx).unwrap();
2094 if is_ref && !ty_has_inner {
2095 // If we don't have an inner variable's reference to maintain, just
2096 // hope the type is Clonable and use that.
2097 write!(w, ".clone()").unwrap();
2099 var_suffix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2101 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2105 _ => unimplemented!(),
2109 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) -> bool {
2110 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, false, ptr_for_ref, true,
2111 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2112 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2113 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2114 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2115 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2117 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 {
2118 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref)
2120 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 {
2121 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false,
2122 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2123 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2124 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2125 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2126 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2129 // ******************************************************
2130 // *** C Container Type Equivalent and alias Printing ***
2131 // ******************************************************
2133 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 {
2134 for (idx, t) in args.enumerate() {
2136 write!(w, ", ").unwrap();
2138 if let syn::Type::Reference(r_arg) = t {
2139 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2141 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false) { return false; }
2143 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2144 // reference to something stupid, so check that the container is either opaque or a
2145 // predefined type (currently only Transaction).
2146 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2147 let resolved = self.resolve_path(&p_arg.path, generics);
2148 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2149 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2150 } else { unimplemented!(); }
2151 } else if let syn::Type::Path(p_arg) = t {
2152 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2153 if !self.is_primitive(&resolved) {
2154 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2157 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2159 if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; }
2161 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2162 if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; }
2167 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2168 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2169 let mut created_container: Vec<u8> = Vec::new();
2171 if container_type == "Result" {
2172 let mut a_ty: Vec<u8> = Vec::new();
2173 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2174 if tup.elems.is_empty() {
2175 write!(&mut a_ty, "()").unwrap();
2177 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2180 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2183 let mut b_ty: Vec<u8> = Vec::new();
2184 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2185 if tup.elems.is_empty() {
2186 write!(&mut b_ty, "()").unwrap();
2188 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2191 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2194 let ok_str = String::from_utf8(a_ty).unwrap();
2195 let err_str = String::from_utf8(b_ty).unwrap();
2196 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2197 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2199 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2201 } else if container_type == "Vec" {
2202 let mut a_ty: Vec<u8> = Vec::new();
2203 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2204 let ty = String::from_utf8(a_ty).unwrap();
2205 let is_clonable = self.is_clonable(&ty);
2206 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2208 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2210 } else if container_type.ends_with("Tuple") {
2211 let mut tuple_args = Vec::new();
2212 let mut is_clonable = true;
2213 for arg in args.iter() {
2214 let mut ty: Vec<u8> = Vec::new();
2215 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2216 let ty_str = String::from_utf8(ty).unwrap();
2217 if !self.is_clonable(&ty_str) {
2218 is_clonable = false;
2220 tuple_args.push(ty_str);
2222 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2224 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2226 } else if container_type == "Option" {
2227 let mut a_ty: Vec<u8> = Vec::new();
2228 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2229 let ty = String::from_utf8(a_ty).unwrap();
2230 let is_clonable = self.is_clonable(&ty);
2231 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2233 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2238 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2242 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2243 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2244 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2245 } else { unimplemented!(); }
2247 fn write_c_mangled_container_path_intern<W: std::io::Write>
2248 (&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 {
2249 let mut mangled_type: Vec<u8> = Vec::new();
2250 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2251 write!(w, "C{}_", ident).unwrap();
2252 write!(mangled_type, "C{}_", ident).unwrap();
2253 } else { assert_eq!(args.len(), 1); }
2254 for arg in args.iter() {
2255 macro_rules! write_path {
2256 ($p_arg: expr, $extra_write: expr) => {
2257 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2258 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2260 if self.c_type_has_inner_from_path(&subtype) {
2261 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref) { return false; }
2263 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2264 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false) { return false; }
2266 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2267 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true) { return false; }
2271 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2273 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2274 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2275 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2278 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2279 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2280 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2281 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2282 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2285 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2286 write!(w, "{}", id).unwrap();
2287 write!(mangled_type, "{}", id).unwrap();
2288 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2289 write!(w2, "{}", id).unwrap();
2292 } else { return false; }
2295 if let syn::Type::Tuple(tuple) = arg {
2296 if tuple.elems.len() == 0 {
2297 write!(w, "None").unwrap();
2298 write!(mangled_type, "None").unwrap();
2300 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2302 // Figure out what the mangled type should look like. To disambiguate
2303 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2304 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2305 // available for use in type names.
2306 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2307 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2308 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2309 for elem in tuple.elems.iter() {
2310 if let syn::Type::Path(p) = elem {
2311 write_path!(p, Some(&mut mangled_tuple_type));
2312 } else if let syn::Type::Reference(refelem) = elem {
2313 if let syn::Type::Path(p) = &*refelem.elem {
2314 write_path!(p, Some(&mut mangled_tuple_type));
2315 } else { return false; }
2316 } else { return false; }
2318 write!(w, "Z").unwrap();
2319 write!(mangled_type, "Z").unwrap();
2320 write!(mangled_tuple_type, "Z").unwrap();
2321 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2322 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2326 } else if let syn::Type::Path(p_arg) = arg {
2327 write_path!(p_arg, None);
2328 } else if let syn::Type::Reference(refty) = arg {
2329 if let syn::Type::Path(p_arg) = &*refty.elem {
2330 write_path!(p_arg, None);
2331 } else if let syn::Type::Slice(_) = &*refty.elem {
2332 // write_c_type will actually do exactly what we want here, we just need to
2333 // make it a pointer so that its an option. Note that we cannot always convert
2334 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2335 // to edit it, hence we use *mut here instead of *const.
2336 if args.len() != 1 { return false; }
2337 write!(w, "*mut ").unwrap();
2338 self.write_c_type(w, arg, None, true);
2339 } else { return false; }
2340 } else if let syn::Type::Array(a) = arg {
2341 if let syn::Type::Path(p_arg) = &*a.elem {
2342 let resolved = self.resolve_path(&p_arg.path, generics);
2343 if !self.is_primitive(&resolved) { return false; }
2344 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2345 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2346 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2347 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2348 } else { return false; }
2349 } else { return false; }
2350 } else { return false; }
2352 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) { return true; }
2353 // Push the "end of type" Z
2354 write!(w, "Z").unwrap();
2355 write!(mangled_type, "Z").unwrap();
2357 // Make sure the type is actually defined:
2358 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2360 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 {
2361 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2362 write!(w, "{}::", Self::generated_container_path()).unwrap();
2364 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2366 pub fn get_c_mangled_container_type(&self, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, template_name: &str) -> Option<String> {
2367 let mut out = Vec::new();
2368 if !self.write_c_mangled_container_path(&mut out, args, generics, template_name, false, false, false) {
2371 Some(String::from_utf8(out).unwrap())
2374 // **********************************
2375 // *** C Type Equivalent Printing ***
2376 // **********************************
2378 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) -> bool {
2379 let full_path = match self.maybe_resolve_path(&path, generics) {
2380 Some(path) => path, None => return false };
2381 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2382 write!(w, "{}", c_type).unwrap();
2384 } else if self.crate_types.traits.get(&full_path).is_some() {
2385 if is_ref && ptr_for_ref {
2386 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2388 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2390 write!(w, "crate::{}", full_path).unwrap();
2393 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2394 if is_ref && ptr_for_ref {
2395 // ptr_for_ref implies we're returning the object, which we can't really do for
2396 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2397 // the actual object itself (for opaque types we'll set the pointer to the actual
2398 // type and note that its a reference).
2399 write!(w, "crate::{}", full_path).unwrap();
2401 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2403 write!(w, "crate::{}", full_path).unwrap();
2410 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) -> bool {
2412 syn::Type::Path(p) => {
2413 if p.qself.is_some() {
2416 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2417 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2418 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);
2420 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2421 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref);
2424 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref)
2426 syn::Type::Reference(r) => {
2427 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref)
2429 syn::Type::Array(a) => {
2430 if is_ref && is_mut {
2431 write!(w, "*mut [").unwrap();
2432 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2434 write!(w, "*const [").unwrap();
2435 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2437 let mut typecheck = Vec::new();
2438 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2439 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2441 if let syn::Expr::Lit(l) = &a.len {
2442 if let syn::Lit::Int(i) = &l.lit {
2444 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2445 write!(w, "{}", ty).unwrap();
2449 write!(w, "; {}]", i).unwrap();
2455 syn::Type::Slice(s) => {
2456 if !is_ref || is_mut { return false; }
2457 if let syn::Type::Path(p) = &*s.elem {
2458 let resolved = self.resolve_path(&p.path, generics);
2459 if self.is_primitive(&resolved) {
2460 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2463 } else if let syn::Type::Reference(r) = &*s.elem {
2464 if let syn::Type::Path(p) = &*r.elem {
2465 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
2466 let resolved = self.resolve_path(&p.path, generics);
2467 let mangled_container = if let Some(ident) = self.crate_types.opaques.get(&resolved) {
2468 format!("CVec_{}Z", ident)
2469 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
2470 format!("CVec_{}Z", en.ident)
2471 } else if let Some(id) = p.path.get_ident() {
2472 format!("CVec_{}Z", id)
2473 } else { return false; };
2474 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2475 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
2477 } else if let syn::Type::Tuple(_) = &*s.elem {
2478 let mut args = syn::punctuated::Punctuated::<_, syn::token::Comma>::new();
2479 args.push(syn::GenericArgument::Type((*s.elem).clone()));
2480 let mut segments = syn::punctuated::Punctuated::new();
2481 segments.push(parse_quote!(Vec<#args>));
2482 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)
2485 syn::Type::Tuple(t) => {
2486 if t.elems.len() == 0 {
2489 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
2490 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
2496 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2497 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref));
2499 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
2500 if p.leading_colon.is_some() { return false; }
2501 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false)
2503 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2504 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false)