1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE>
5 // or the MIT license <LICENSE-MIT>, at your option.
6 // You may not use this file except in accordance with one or both of these
9 use std::cell::RefCell;
10 use std::collections::{HashMap, HashSet};
17 use proc_macro2::{TokenTree, Span};
18 use quote::format_ident;
21 // The following utils are used purely to build our known types maps - they break down all the
22 // types we need to resolve to include the given object, and no more.
24 pub fn first_seg_self<'a>(t: &'a syn::Type) -> Option<impl Iterator<Item=&syn::PathSegment> + 'a> {
26 syn::Type::Path(p) => {
27 if p.qself.is_some() || p.path.leading_colon.is_some() {
30 let mut segs = p.path.segments.iter();
31 let ty = segs.next().unwrap();
32 if !ty.arguments.is_empty() { return None; }
33 if format!("{}", ty.ident) == "Self" {
41 pub fn get_single_remaining_path_seg<'a, I: Iterator<Item=&'a syn::PathSegment>>(segs: &mut I) -> Option<&'a syn::Ident> {
42 if let Some(ty) = segs.next() {
43 if !ty.arguments.is_empty() { unimplemented!(); }
44 if segs.next().is_some() { return None; }
49 pub fn first_seg_is_stdlib(first_seg_str: &str) -> bool {
50 first_seg_str == "std" || first_seg_str == "core" || first_seg_str == "alloc"
53 pub fn single_ident_generic_path_to_ident(p: &syn::Path) -> Option<&syn::Ident> {
54 if p.segments.len() == 1 {
55 Some(&p.segments.iter().next().unwrap().ident)
59 pub fn path_matches_nongeneric(p: &syn::Path, exp: &[&str]) -> bool {
60 if p.segments.len() != exp.len() { return false; }
61 for (seg, e) in p.segments.iter().zip(exp.iter()) {
62 if seg.arguments != syn::PathArguments::None { return false; }
63 if &format!("{}", seg.ident) != *e { return false; }
68 #[derive(Debug, PartialEq)]
69 pub enum ExportStatus {
73 /// This is used only for traits to indicate that users should not be able to implement their
74 /// own version of a trait, but we should export Rust implementations of the trait (and the
76 /// Concretly, this means that we do not implement the Rust trait for the C trait struct.
79 /// Gets the ExportStatus of an object (struct, fn, etc) given its attributes.
80 pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
81 for attr in attrs.iter() {
82 let tokens_clone = attr.tokens.clone();
83 let mut token_iter = tokens_clone.into_iter();
84 if let Some(token) = token_iter.next() {
86 TokenTree::Punct(c) if c.as_char() == '=' => {
87 // Really not sure where syn gets '=' from here -
88 // it somehow represents '///' or '//!'
90 TokenTree::Group(g) => {
91 if format!("{}", single_ident_generic_path_to_ident(&attr.path).unwrap()) == "cfg" {
92 let mut iter = g.stream().into_iter();
93 if let TokenTree::Ident(i) = iter.next().unwrap() {
95 // #[cfg(any(test, feature = ""))]
96 if let TokenTree::Group(g) = iter.next().unwrap() {
97 let mut all_test = true;
98 for token in g.stream().into_iter() {
99 if let TokenTree::Ident(i) = token {
100 match format!("{}", i).as_str() {
103 _ => all_test = false,
105 } else if let TokenTree::Literal(lit) = token {
106 if format!("{}", lit) != "fuzztarget" {
111 if all_test { return ExportStatus::TestOnly; }
113 } else if i == "test" {
114 return ExportStatus::TestOnly;
118 continue; // eg #[derive()]
120 _ => unimplemented!(),
123 match token_iter.next().unwrap() {
124 TokenTree::Literal(lit) => {
125 let line = format!("{}", lit);
126 if line.contains("(C-not exported)") {
127 return ExportStatus::NoExport;
128 } else if line.contains("(C-not implementable)") {
129 return ExportStatus::NotImplementable;
132 _ => unimplemented!(),
138 pub fn assert_simple_bound(bound: &syn::TraitBound) {
139 if bound.paren_token.is_some() || bound.lifetimes.is_some() { unimplemented!(); }
140 if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
143 /// Returns true if the enum will be mapped as an opaue (ie struct with a pointer to the underlying
144 /// type), otherwise it is mapped into a transparent, C-compatible version of itself.
145 pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool {
146 for var in e.variants.iter() {
147 if let syn::Fields::Named(fields) = &var.fields {
148 for field in fields.named.iter() {
149 match export_status(&field.attrs) {
150 ExportStatus::Export|ExportStatus::TestOnly => {},
151 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
152 ExportStatus::NoExport => return true,
155 } else if let syn::Fields::Unnamed(fields) = &var.fields {
156 for field in fields.unnamed.iter() {
157 match export_status(&field.attrs) {
158 ExportStatus::Export|ExportStatus::TestOnly => {},
159 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
160 ExportStatus::NoExport => return true,
168 /// A stack of sets of generic resolutions.
170 /// This tracks the template parameters for a function, struct, or trait, allowing resolution into
171 /// a concrete type. By pushing a new context onto the stack, this can track a function's template
172 /// parameters inside of a generic struct or trait.
174 /// It maps both direct types as well as Deref<Target = X>, mapping them via the provided
175 /// TypeResolver's resolve_path function (ie traits map to the concrete jump table, structs to the
176 /// concrete C container struct, etc).
178 pub struct GenericTypes<'a, 'b> {
179 self_ty: Option<String>,
180 parent: Option<&'b GenericTypes<'b, 'b>>,
181 typed_generics: HashMap<&'a syn::Ident, String>,
182 default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type)>,
184 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
185 pub fn new(self_ty: Option<String>) -> Self {
186 Self { self_ty, parent: None, typed_generics: HashMap::new(), default_generics: HashMap::new(), }
189 /// push a new context onto the stack, allowing for a new set of generics to be learned which
190 /// will override any lower contexts, but which will still fall back to resoltion via lower
192 pub fn push_ctx<'c>(&'c self) -> GenericTypes<'a, 'c> {
193 GenericTypes { self_ty: None, parent: Some(self), typed_generics: HashMap::new(), default_generics: HashMap::new(), }
196 /// Learn the generics in generics in the current context, given a TypeResolver.
197 pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
198 let mut new_typed_generics = HashMap::new();
199 // First learn simple generics...
200 for generic in generics.params.iter() {
202 syn::GenericParam::Type(type_param) => {
203 let mut non_lifetimes_processed = false;
204 'bound_loop: for bound in type_param.bounds.iter() {
205 if let syn::TypeParamBound::Trait(trait_bound) = bound {
206 if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
207 match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
209 if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
211 assert_simple_bound(&trait_bound);
212 if let Some(path) = types.maybe_resolve_path(&trait_bound.path, None) {
213 if types.skip_path(&path) { continue; }
214 if path == "Sized" { continue; }
215 if non_lifetimes_processed { return false; }
216 non_lifetimes_processed = true;
217 if path != "std::ops::Deref" && path != "core::ops::Deref" {
218 new_typed_generics.insert(&type_param.ident, Some(path));
219 } else if trait_bound.path.segments.len() == 1 {
220 // If we're templated on Deref<Target = ConcreteThing>, store
221 // the reference type in `default_generics` which handles full
222 // types and not just paths.
223 if let syn::PathArguments::AngleBracketed(ref args) =
224 trait_bound.path.segments[0].arguments {
225 for subargument in args.args.iter() {
227 syn::GenericArgument::Lifetime(_) => {},
228 syn::GenericArgument::Binding(ref b) => {
229 if &format!("{}", b.ident) != "Target" { return false; }
231 self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default)));
234 _ => unimplemented!(),
238 new_typed_generics.insert(&type_param.ident, None);
244 if let Some(default) = type_param.default.as_ref() {
245 assert!(type_param.bounds.is_empty());
246 self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default)));
252 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
253 if let Some(wh) = &generics.where_clause {
254 for pred in wh.predicates.iter() {
255 if let syn::WherePredicate::Type(t) = pred {
256 if let syn::Type::Path(p) = &t.bounded_ty {
257 if p.qself.is_some() { return false; }
258 if p.path.leading_colon.is_some() { return false; }
259 let mut p_iter = p.path.segments.iter();
260 if let Some(gen) = new_typed_generics.get_mut(&p_iter.next().unwrap().ident) {
261 if gen.is_some() { return false; }
262 if &format!("{}", p_iter.next().unwrap().ident) != "Target" {return false; }
264 let mut non_lifetimes_processed = false;
265 for bound in t.bounds.iter() {
266 if let syn::TypeParamBound::Trait(trait_bound) = bound {
267 if let Some(id) = trait_bound.path.get_ident() {
268 if format!("{}", id) == "Sized" { continue; }
270 if non_lifetimes_processed { return false; }
271 non_lifetimes_processed = true;
272 assert_simple_bound(&trait_bound);
273 *gen = Some(types.resolve_path(&trait_bound.path, None));
276 } else { return false; }
277 } else { return false; }
281 for (key, value) in new_typed_generics.drain() {
282 if let Some(v) = value {
283 assert!(self.typed_generics.insert(key, v).is_none());
284 } else { return false; }
289 /// Learn the associated types from the trait in the current context.
290 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
291 for item in t.items.iter() {
293 &syn::TraitItem::Type(ref t) => {
294 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
295 let mut bounds_iter = t.bounds.iter();
297 match bounds_iter.next().unwrap() {
298 syn::TypeParamBound::Trait(tr) => {
299 assert_simple_bound(&tr);
300 if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
301 if types.skip_path(&path) { continue; }
302 // In general we handle Deref<Target=X> as if it were just X (and
303 // implement Deref<Target=Self> for relevant types). We don't
304 // bother to implement it for associated types, however, so we just
305 // ignore such bounds.
306 if path != "std::ops::Deref" && path != "core::ops::Deref" {
307 self.typed_generics.insert(&t.ident, path);
309 } else { unimplemented!(); }
310 for bound in bounds_iter {
311 if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
315 syn::TypeParamBound::Lifetime(_) => {},
324 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
326 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<&'b String> {
327 if let Some(ident) = path.get_ident() {
328 if let Some(ty) = &self.self_ty {
329 if format!("{}", ident) == "Self" {
333 if let Some(res) = self.typed_generics.get(ident) {
337 // Associated types are usually specified as "Self::Generic", so we check for that
339 let mut it = path.segments.iter();
340 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
341 let ident = &it.next().unwrap().ident;
342 if let Some(res) = self.typed_generics.get(ident) {
347 if let Some(parent) = self.parent {
348 parent.maybe_resolve_path(path)
355 trait ResolveType<'a> { fn resolve_type(&'a self, ty: &'a syn::Type) -> &'a syn::Type; }
356 impl<'a, 'b, 'c: 'a + 'b> ResolveType<'c> for Option<&GenericTypes<'a, 'b>> {
357 fn resolve_type(&'c self, ty: &'c syn::Type) -> &'c syn::Type {
358 if let Some(us) = self {
360 syn::Type::Path(p) => {
361 if let Some(ident) = p.path.get_ident() {
362 if let Some((ty, _)) = us.default_generics.get(ident) {
367 syn::Type::Reference(syn::TypeReference { elem, .. }) => {
368 if let syn::Type::Path(p) = &**elem {
369 if let Some(ident) = p.path.get_ident() {
370 if let Some((_, refty)) = us.default_generics.get(ident) {
378 us.parent.resolve_type(ty)
383 #[derive(Clone, PartialEq)]
384 // The type of declaration and the object itself
385 pub enum DeclType<'a> {
387 Trait(&'a syn::ItemTrait),
388 StructImported { generics: &'a syn::Generics },
390 EnumIgnored { generics: &'a syn::Generics },
393 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
394 crate_name: &'mod_lifetime str,
395 dependencies: &'mod_lifetime HashSet<syn::Ident>,
396 module_path: &'mod_lifetime str,
397 imports: HashMap<syn::Ident, (String, syn::Path)>,
398 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
399 priv_modules: HashSet<syn::Ident>,
401 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
402 fn process_use_intern(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>,
403 u: &syn::UseTree, partial_path: &str, mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>) {
406 macro_rules! push_path {
407 ($ident: expr, $path_suffix: expr) => {
408 if partial_path == "" && format!("{}", $ident) == "super" {
409 let mut mod_iter = module_path.rsplitn(2, "::");
410 mod_iter.next().unwrap();
411 let super_mod = mod_iter.next().unwrap();
412 new_path = format!("{}{}", super_mod, $path_suffix);
413 assert_eq!(path.len(), 0);
414 for module in super_mod.split("::") {
415 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
417 } else if partial_path == "" && format!("{}", $ident) == "self" {
418 new_path = format!("{}{}", module_path, $path_suffix);
419 for module in module_path.split("::") {
420 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
422 } else if partial_path == "" && format!("{}", $ident) == "crate" {
423 new_path = format!("{}{}", crate_name, $path_suffix);
424 let crate_name_ident = format_ident!("{}", crate_name);
425 path.push(parse_quote!(#crate_name_ident));
426 } else if partial_path == "" && !dependencies.contains(&$ident) {
427 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
428 let crate_name_ident = format_ident!("{}", crate_name);
429 path.push(parse_quote!(#crate_name_ident));
431 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
434 path.push(parse_quote!(#ident));
438 syn::UseTree::Path(p) => {
439 push_path!(p.ident, "::");
440 Self::process_use_intern(crate_name, module_path, dependencies, imports, &p.tree, &new_path, path);
442 syn::UseTree::Name(n) => {
443 push_path!(n.ident, "");
444 imports.insert(n.ident.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
446 syn::UseTree::Group(g) => {
447 for i in g.items.iter() {
448 Self::process_use_intern(crate_name, module_path, dependencies, imports, i, partial_path, path.clone());
451 syn::UseTree::Rename(r) => {
452 push_path!(r.ident, "");
453 imports.insert(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
455 syn::UseTree::Glob(_) => {
456 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
461 fn process_use(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
462 if let syn::Visibility::Public(_) = u.vis {
463 // We actually only use these for #[cfg(fuzztarget)]
464 eprintln!("Ignoring pub(use) tree!");
467 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
468 Self::process_use_intern(crate_name, module_path, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
471 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
472 let ident = format_ident!("{}", id);
473 let path = parse_quote!(#ident);
474 imports.insert(ident, (id.to_owned(), path));
477 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 {
478 Self::from_borrowed_items(crate_name, dependencies, module_path, &contents.iter().map(|a| a).collect::<Vec<_>>())
480 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 {
481 let mut imports = HashMap::new();
482 // Add primitives to the "imports" list:
483 Self::insert_primitive(&mut imports, "bool");
484 Self::insert_primitive(&mut imports, "u64");
485 Self::insert_primitive(&mut imports, "u32");
486 Self::insert_primitive(&mut imports, "u16");
487 Self::insert_primitive(&mut imports, "u8");
488 Self::insert_primitive(&mut imports, "usize");
489 Self::insert_primitive(&mut imports, "str");
490 Self::insert_primitive(&mut imports, "String");
492 // These are here to allow us to print native Rust types in trait fn impls even if we don't
494 Self::insert_primitive(&mut imports, "Result");
495 Self::insert_primitive(&mut imports, "Vec");
496 Self::insert_primitive(&mut imports, "Option");
498 let mut declared = HashMap::new();
499 let mut priv_modules = HashSet::new();
501 for item in contents.iter() {
503 syn::Item::Use(u) => Self::process_use(crate_name, module_path, dependencies, &mut imports, &u),
504 syn::Item::Struct(s) => {
505 if let syn::Visibility::Public(_) = s.vis {
506 match export_status(&s.attrs) {
507 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported { generics: &s.generics }); },
508 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
509 ExportStatus::TestOnly => continue,
510 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
514 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
515 if let syn::Visibility::Public(_) = t.vis {
516 let mut process_alias = true;
517 for tok in t.generics.params.iter() {
518 if let syn::GenericParam::Lifetime(_) = tok {}
519 else { process_alias = false; }
522 declared.insert(t.ident.clone(), DeclType::StructImported { generics: &t.generics });
526 syn::Item::Enum(e) => {
527 if let syn::Visibility::Public(_) = e.vis {
528 match export_status(&e.attrs) {
529 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored { generics: &e.generics }); },
530 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
531 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
536 syn::Item::Trait(t) => {
537 match export_status(&t.attrs) {
538 ExportStatus::Export|ExportStatus::NotImplementable => {
539 if let syn::Visibility::Public(_) = t.vis {
540 declared.insert(t.ident.clone(), DeclType::Trait(t));
546 syn::Item::Mod(m) => {
547 priv_modules.insert(m.ident.clone());
553 Self { crate_name, dependencies, module_path, imports, declared, priv_modules }
556 pub fn get_declared_type(&self, ident: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
557 self.declared.get(ident)
560 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
561 self.declared.get(id)
564 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
565 if let Some((imp, _)) = self.imports.get(id) {
567 } else if self.declared.get(id).is_some() {
568 Some(self.module_path.to_string() + "::" + &format!("{}", id))
572 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
573 if let Some((imp, _)) = self.imports.get(id) {
575 } else if let Some(decl_type) = self.declared.get(id) {
577 DeclType::StructIgnored => None,
578 _ => Some(self.module_path.to_string() + "::" + &format!("{}", id)),
583 pub fn maybe_resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
584 if let Some(gen_types) = generics {
585 if let Some(resp) = gen_types.maybe_resolve_path(p) {
586 return Some(resp.clone());
590 if p.leading_colon.is_some() {
591 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
592 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
594 let firstseg = p.segments.iter().next().unwrap();
595 if !self.dependencies.contains(&firstseg.ident) {
596 res = self.crate_name.to_owned() + "::" + &res;
599 } else if let Some(id) = p.get_ident() {
600 self.maybe_resolve_ident(id)
602 if p.segments.len() == 1 {
603 let seg = p.segments.iter().next().unwrap();
604 return self.maybe_resolve_ident(&seg.ident);
606 let mut seg_iter = p.segments.iter();
607 let first_seg = seg_iter.next().unwrap();
608 let remaining: String = seg_iter.map(|seg| {
609 format!("::{}", seg.ident)
611 let first_seg_str = format!("{}", first_seg.ident);
612 if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
614 Some(imp.clone() + &remaining)
618 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
619 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
620 } else if first_seg_is_stdlib(&first_seg_str) || self.dependencies.contains(&first_seg.ident) {
621 Some(first_seg_str + &remaining)
626 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
627 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
629 syn::Type::Path(p) => {
630 if p.path.segments.len() != 1 { unimplemented!(); }
631 let mut args = p.path.segments[0].arguments.clone();
632 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
633 for arg in generics.args.iter_mut() {
634 if let syn::GenericArgument::Type(ref mut t) = arg {
635 *t = self.resolve_imported_refs(t.clone());
639 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
640 p.path = newpath.clone();
642 p.path.segments[0].arguments = args;
644 syn::Type::Reference(r) => {
645 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
647 syn::Type::Slice(s) => {
648 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
650 syn::Type::Tuple(t) => {
651 for e in t.elems.iter_mut() {
652 *e = self.resolve_imported_refs(e.clone());
655 _ => unimplemented!(),
661 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
662 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
663 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
664 // accomplish the same goals, so we just ignore it.
666 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
669 pub struct ASTModule {
670 pub attrs: Vec<syn::Attribute>,
671 pub items: Vec<syn::Item>,
672 pub submods: Vec<String>,
674 /// A struct containing the syn::File AST for each file in the crate.
675 pub struct FullLibraryAST {
676 pub modules: HashMap<String, ASTModule, NonRandomHash>,
677 pub dependencies: HashSet<syn::Ident>,
679 impl FullLibraryAST {
680 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
681 let mut non_mod_items = Vec::with_capacity(items.len());
682 let mut submods = Vec::with_capacity(items.len());
683 for item in items.drain(..) {
685 syn::Item::Mod(m) if m.content.is_some() => {
686 if export_status(&m.attrs) == ExportStatus::Export {
687 if let syn::Visibility::Public(_) = m.vis {
688 let modident = format!("{}", m.ident);
689 let modname = if module != "" {
690 module.clone() + "::" + &modident
694 self.load_module(modname, m.attrs, m.content.unwrap().1);
695 submods.push(modident);
697 non_mod_items.push(syn::Item::Mod(m));
701 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
702 syn::Item::ExternCrate(c) => {
703 if export_status(&c.attrs) == ExportStatus::Export {
704 self.dependencies.insert(c.ident);
707 _ => { non_mod_items.push(item); }
710 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
713 pub fn load_lib(lib: syn::File) -> Self {
714 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
715 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
716 res.load_module("".to_owned(), lib.attrs, lib.items);
721 /// List of manually-generated types which are clonable
722 fn initial_clonable_types() -> HashSet<String> {
723 let mut res = HashSet::new();
724 res.insert("crate::c_types::u5".to_owned());
725 res.insert("crate::c_types::ThirtyTwoBytes".to_owned());
726 res.insert("crate::c_types::PublicKey".to_owned());
727 res.insert("crate::c_types::Transaction".to_owned());
728 res.insert("crate::c_types::TxOut".to_owned());
729 res.insert("crate::c_types::Signature".to_owned());
730 res.insert("crate::c_types::RecoverableSignature".to_owned());
731 res.insert("crate::c_types::Secp256k1Error".to_owned());
732 res.insert("crate::c_types::IOError".to_owned());
736 /// Top-level struct tracking everything which has been defined while walking the crate.
737 pub struct CrateTypes<'a> {
738 /// This may contain structs or enums, but only when either is mapped as
739 /// struct X { inner: *mut originalX, .. }
740 pub opaques: HashMap<String, (&'a syn::Ident, &'a syn::Generics)>,
741 /// Enums which are mapped as C enums with conversion functions
742 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
743 /// Traits which are mapped as a pointer + jump table
744 pub traits: HashMap<String, &'a syn::ItemTrait>,
745 /// Aliases from paths to some other Type
746 pub type_aliases: HashMap<String, syn::Type>,
747 /// Value is an alias to Key (maybe with some generics)
748 pub reverse_alias_map: HashMap<String, Vec<(syn::Path, syn::PathArguments)>>,
749 /// Template continer types defined, map from mangled type name -> whether a destructor fn
752 /// This is used at the end of processing to make C++ wrapper classes
753 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
754 /// The output file for any created template container types, written to as we find new
755 /// template containers which need to be defined.
756 template_file: RefCell<&'a mut File>,
757 /// Set of containers which are clonable
758 clonable_types: RefCell<HashSet<String>>,
760 pub trait_impls: HashMap<String, Vec<String>>,
761 /// The full set of modules in the crate(s)
762 pub lib_ast: &'a FullLibraryAST,
765 impl<'a> CrateTypes<'a> {
766 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
768 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
769 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
770 templates_defined: RefCell::new(HashMap::default()),
771 clonable_types: RefCell::new(initial_clonable_types()), trait_impls: HashMap::new(),
772 template_file: RefCell::new(template_file), lib_ast: &libast,
775 pub fn set_clonable(&self, object: String) {
776 self.clonable_types.borrow_mut().insert(object);
778 pub fn is_clonable(&self, object: &str) -> bool {
779 self.clonable_types.borrow().contains(object)
781 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
782 self.template_file.borrow_mut().write(created_container).unwrap();
783 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
787 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
788 /// module but contains a reference to the overall CrateTypes tracking.
789 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
790 pub module_path: &'mod_lifetime str,
791 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
792 types: ImportResolver<'mod_lifetime, 'crate_lft>,
795 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
796 /// happen to get the inner value of a generic.
797 enum EmptyValExpectedTy {
798 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
800 /// A Option mapped as a COption_*Z
802 /// A pointer which we want to convert to a reference.
807 /// Describes the appropriate place to print a general type-conversion string when converting a
809 enum ContainerPrefixLocation {
810 /// Prints a general type-conversion string prefix and suffix outside of the
811 /// container-conversion strings.
813 /// Prints a general type-conversion string prefix and suffix inside of the
814 /// container-conversion strings.
816 /// Does not print the usual type-conversion string prefix and suffix.
820 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
821 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
822 Self { module_path, types, crate_types }
825 // *************************************************
826 // *** Well know type and conversion definitions ***
827 // *************************************************
829 /// Returns true we if can just skip passing this to C entirely
830 pub fn skip_path(&self, full_path: &str) -> bool {
831 full_path == "bitcoin::secp256k1::Secp256k1" ||
832 full_path == "bitcoin::secp256k1::Signing" ||
833 full_path == "bitcoin::secp256k1::Verification"
835 /// Returns true we if can just skip passing this to C entirely
836 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
837 if full_path == "bitcoin::secp256k1::Secp256k1" {
838 "secp256k1::SECP256K1"
839 } else { unimplemented!(); }
842 /// Returns true if the object is a primitive and is mapped as-is with no conversion
844 pub fn is_primitive(&self, full_path: &str) -> bool {
855 pub fn is_clonable(&self, ty: &str) -> bool {
856 if self.crate_types.is_clonable(ty) { return true; }
857 if self.is_primitive(ty) { return true; }
863 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
864 /// ignored by for some reason need mapping anyway.
865 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
866 if self.is_primitive(full_path) {
867 return Some(full_path);
870 // Note that no !is_ref types can map to an array because Rust and C's call semantics
871 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
873 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
874 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes"),
875 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
876 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes"),
877 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
878 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
880 "str" if is_ref => Some("crate::c_types::Str"),
881 "alloc::string::String"|"String" => Some("crate::c_types::Str"),
883 "std::time::Duration"|"core::time::Duration" => Some("u64"),
884 "std::time::SystemTime" => Some("u64"),
885 "std::io::Error" => Some("crate::c_types::IOError"),
886 "core::fmt::Arguments" if is_ref => Some("crate::c_types::Str"),
888 "core::convert::Infallible" => Some("crate::c_types::NotConstructable"),
890 "bitcoin::bech32::u5"|"bech32::u5" => Some("crate::c_types::u5"),
891 "core::num::NonZeroU8" => Some("u8"),
893 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
894 => Some("crate::c_types::PublicKey"),
895 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature"),
896 "bitcoin::secp256k1::recovery::RecoverableSignature" => Some("crate::c_types::RecoverableSignature"),
897 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
898 if is_ref => Some("*const [u8; 32]"),
899 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
900 if !is_ref => Some("crate::c_types::SecretKey"),
901 "bitcoin::secp256k1::Error"|"secp256k1::Error"
902 if !is_ref => Some("crate::c_types::Secp256k1Error"),
903 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
904 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
905 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
906 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction"),
907 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
908 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
909 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
910 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
912 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|"bitcoin::hash_types::ScriptHash"
913 if is_ref => Some("*const [u8; 20]"),
914 "bitcoin::hash_types::WScriptHash"
915 if is_ref => Some("*const [u8; 32]"),
917 // Newtypes that we just expose in their original form.
918 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
919 if is_ref => Some("*const [u8; 32]"),
920 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
921 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
922 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
923 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
924 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
925 if is_ref => Some("*const [u8; 32]"),
926 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
927 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
928 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
930 "lightning::io::Read" => Some("crate::c_types::u8slice"),
936 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
939 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
940 if self.is_primitive(full_path) {
941 return Some("".to_owned());
944 "Vec" if !is_ref => Some("local_"),
945 "Result" if !is_ref => Some("local_"),
946 "Option" if is_ref => Some("&local_"),
947 "Option" => Some("local_"),
949 "[u8; 32]" if is_ref => Some("unsafe { &*"),
950 "[u8; 32]" if !is_ref => Some(""),
951 "[u8; 20]" if !is_ref => Some(""),
952 "[u8; 16]" if !is_ref => Some(""),
953 "[u8; 12]" if !is_ref => Some(""),
954 "[u8; 4]" if !is_ref => Some(""),
955 "[u8; 3]" if !is_ref => Some(""),
957 "[u8]" if is_ref => Some(""),
958 "[usize]" if is_ref => Some(""),
960 "str" if is_ref => Some(""),
961 "alloc::string::String"|"String" => Some(""),
962 "std::io::Error" if !is_ref => Some(""),
963 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
964 // cannot create a &String.
966 "core::convert::Infallible" => Some("panic!(\"You must never construct a NotConstructable! : "),
968 "std::time::Duration"|"core::time::Duration" => Some("core::time::Duration::from_secs("),
969 "std::time::SystemTime" => Some("(::std::time::SystemTime::UNIX_EPOCH + std::time::Duration::from_secs("),
971 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
972 "core::num::NonZeroU8" => Some("core::num::NonZeroU8::new("),
974 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
975 if is_ref => Some("&"),
976 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
978 "bitcoin::secp256k1::Signature" if is_ref => Some("&"),
979 "bitcoin::secp256k1::Signature" => Some(""),
980 "bitcoin::secp256k1::recovery::RecoverableSignature" => Some(""),
981 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
982 if is_ref => Some("&::bitcoin::secp256k1::key::SecretKey::from_slice(&unsafe { *"),
983 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
984 if !is_ref => Some(""),
985 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
986 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
987 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("&"),
988 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(""),
989 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::C_to_bitcoin_outpoint("),
990 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
991 "bitcoin::network::constants::Network" => Some(""),
992 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
993 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
995 "bitcoin::hash_types::PubkeyHash" if is_ref =>
996 Some("&bitcoin::hash_types::PubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
997 "bitcoin::hash_types::WPubkeyHash" if is_ref =>
998 Some("&bitcoin::hash_types::WPubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
999 "bitcoin::hash_types::ScriptHash" if is_ref =>
1000 Some("&bitcoin::hash_types::ScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1001 "bitcoin::hash_types::WScriptHash" if is_ref =>
1002 Some("&bitcoin::hash_types::WScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1004 // Newtypes that we just expose in their original form.
1005 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
1006 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
1007 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
1008 "lightning::ln::PaymentHash" if !is_ref => Some("::lightning::ln::PaymentHash("),
1009 "lightning::ln::PaymentHash" if is_ref => Some("&::lightning::ln::PaymentHash(unsafe { *"),
1010 "lightning::ln::PaymentPreimage" if !is_ref => Some("::lightning::ln::PaymentPreimage("),
1011 "lightning::ln::PaymentPreimage" if is_ref => Some("&::lightning::ln::PaymentPreimage(unsafe { *"),
1012 "lightning::ln::PaymentSecret" if !is_ref => Some("::lightning::ln::PaymentSecret("),
1013 "lightning::ln::channelmanager::PaymentId" if !is_ref => Some("::lightning::ln::channelmanager::PaymentId("),
1014 "lightning::ln::channelmanager::PaymentId" if is_ref=> Some("&::lightning::ln::channelmanager::PaymentId( unsafe { *"),
1015 "lightning::chain::keysinterface::KeyMaterial" if !is_ref => Some("::lightning::chain::keysinterface::KeyMaterial("),
1016 "lightning::chain::keysinterface::KeyMaterial" if is_ref=> Some("&::lightning::chain::keysinterface::KeyMaterial( unsafe { *"),
1018 // List of traits we map (possibly during processing of other files):
1019 "lightning::io::Read" => Some("&mut "),
1022 }.map(|s| s.to_owned())
1024 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
1025 if self.is_primitive(full_path) {
1026 return Some("".to_owned());
1029 "Vec" if !is_ref => Some(""),
1030 "Option" => Some(""),
1031 "Result" if !is_ref => Some(""),
1033 "[u8; 32]" if is_ref => Some("}"),
1034 "[u8; 32]" if !is_ref => Some(".data"),
1035 "[u8; 20]" if !is_ref => Some(".data"),
1036 "[u8; 16]" if !is_ref => Some(".data"),
1037 "[u8; 12]" if !is_ref => Some(".data"),
1038 "[u8; 4]" if !is_ref => Some(".data"),
1039 "[u8; 3]" if !is_ref => Some(".data"),
1041 "[u8]" if is_ref => Some(".to_slice()"),
1042 "[usize]" if is_ref => Some(".to_slice()"),
1044 "str" if is_ref => Some(".into_str()"),
1045 "alloc::string::String"|"String" => Some(".into_string()"),
1046 "std::io::Error" if !is_ref => Some(".to_rust()"),
1048 "core::convert::Infallible" => Some("\")"),
1050 "std::time::Duration"|"core::time::Duration" => Some(")"),
1051 "std::time::SystemTime" => Some("))"),
1053 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1054 "core::num::NonZeroU8" => Some(").expect(\"Value must be non-zero\")"),
1056 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
1057 => Some(".into_rust()"),
1058 "bitcoin::secp256k1::Signature" => Some(".into_rust()"),
1059 "bitcoin::secp256k1::recovery::RecoverableSignature" => Some(".into_rust()"),
1060 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1061 if !is_ref => Some(".into_rust()"),
1062 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1063 if is_ref => Some("}[..]).unwrap()"),
1064 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
1065 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
1066 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(".into_bitcoin()"),
1067 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1068 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
1069 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
1070 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
1071 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
1073 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|
1074 "bitcoin::hash_types::ScriptHash"|"bitcoin::hash_types::WScriptHash"
1075 if is_ref => Some(" }.clone()))"),
1077 // Newtypes that we just expose in their original form.
1078 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
1079 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
1080 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
1081 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1082 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1083 if !is_ref => Some(".data)"),
1084 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1085 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1086 if is_ref => Some(" })"),
1088 // List of traits we map (possibly during processing of other files):
1089 "lightning::io::Read" => Some(".to_reader()"),
1092 }.map(|s| s.to_owned())
1095 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
1096 if self.is_primitive(full_path) {
1100 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
1101 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
1103 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
1104 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
1105 "bitcoin::hash_types::Txid" => None,
1108 }.map(|s| s.to_owned())
1110 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1111 if self.is_primitive(full_path) {
1112 return Some("".to_owned());
1115 "Result" if !is_ref => Some("local_"),
1116 "Vec" if !is_ref => Some("local_"),
1117 "Option" => Some("local_"),
1119 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1120 "[u8; 32]" if is_ref => Some(""),
1121 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes { data: "),
1122 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
1123 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes { data: "),
1124 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
1125 "[u8; 3]" if is_ref => Some(""),
1127 "[u8]" if is_ref => Some("local_"),
1128 "[usize]" if is_ref => Some("local_"),
1130 "str" if is_ref => Some(""),
1131 "alloc::string::String"|"String" => Some(""),
1133 "std::time::Duration"|"core::time::Duration" => Some(""),
1134 "std::time::SystemTime" => Some(""),
1135 "std::io::Error" if !is_ref => Some("crate::c_types::IOError::from_rust("),
1136 "core::fmt::Arguments" => Some("alloc::format!(\"{}\", "),
1138 "core::convert::Infallible" => Some("panic!(\"Cannot construct an Infallible: "),
1140 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1142 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
1143 => Some("crate::c_types::PublicKey::from_rust(&"),
1144 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature::from_rust(&"),
1145 "bitcoin::secp256k1::recovery::RecoverableSignature" => Some("crate::c_types::RecoverableSignature::from_rust(&"),
1146 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1147 if is_ref => Some(""),
1148 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1149 if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
1150 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1151 if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
1152 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
1153 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
1154 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("crate::c_types::Transaction::from_bitcoin("),
1155 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction::from_bitcoin(&"),
1156 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
1157 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
1158 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1159 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1160 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1162 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1164 // Newtypes that we just expose in their original form.
1165 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1166 if is_ref => Some(""),
1167 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1168 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1169 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1170 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1171 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1172 if is_ref => Some("&"),
1173 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1174 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1175 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1177 "lightning::io::Read" => Some("crate::c_types::u8slice::from_vec(&crate::c_types::reader_to_vec("),
1180 }.map(|s| s.to_owned())
1182 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1183 if self.is_primitive(full_path) {
1184 return Some("".to_owned());
1187 "Result" if !is_ref => Some(""),
1188 "Vec" if !is_ref => Some(".into()"),
1189 "Option" => Some(""),
1191 "[u8; 32]" if !is_ref => Some(" }"),
1192 "[u8; 32]" if is_ref => Some(""),
1193 "[u8; 20]" if !is_ref => Some(" }"),
1194 "[u8; 16]" if !is_ref => Some(" }"),
1195 "[u8; 12]" if !is_ref => Some(" }"),
1196 "[u8; 4]" if !is_ref => Some(" }"),
1197 "[u8; 3]" if is_ref => Some(""),
1199 "[u8]" if is_ref => Some(""),
1200 "[usize]" if is_ref => Some(""),
1202 "str" if is_ref => Some(".into()"),
1203 "alloc::string::String"|"String" if is_ref => Some(".as_str().into()"),
1204 "alloc::string::String"|"String" => Some(".into()"),
1206 "std::time::Duration"|"core::time::Duration" => Some(".as_secs()"),
1207 "std::time::SystemTime" => Some(".duration_since(::std::time::SystemTime::UNIX_EPOCH).expect(\"Times must be post-1970\").as_secs()"),
1208 "std::io::Error" if !is_ref => Some(")"),
1209 "core::fmt::Arguments" => Some(").into()"),
1211 "core::convert::Infallible" => Some("\")"),
1213 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1215 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"|"secp256k1::key::PublicKey"
1217 "bitcoin::secp256k1::Signature" => Some(")"),
1218 "bitcoin::secp256k1::recovery::RecoverableSignature" => Some(")"),
1219 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1220 if !is_ref => Some(")"),
1221 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1222 if is_ref => Some(".as_ref()"),
1223 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1224 if !is_ref => Some(")"),
1225 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1226 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1227 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(")"),
1228 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1229 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1230 "bitcoin::network::constants::Network" => Some(")"),
1231 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1232 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1234 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1236 // Newtypes that we just expose in their original form.
1237 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1238 if is_ref => Some(".as_inner()"),
1239 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1240 if !is_ref => Some(".into_inner() }"),
1241 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1242 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1243 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1244 if is_ref => Some(".0"),
1245 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1246 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1247 if !is_ref => Some(".0 }"),
1249 "lightning::io::Read" => Some("))"),
1252 }.map(|s| s.to_owned())
1255 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1257 "lightning::ln::PaymentSecret" => Some(".data == [0; 32]"),
1258 "secp256k1::key::PublicKey"|"bitcoin::secp256k1::key::PublicKey" => Some(".is_null()"),
1259 "bitcoin::secp256k1::Signature" => Some(".is_null()"),
1264 /// When printing a reference to the source crate's rust type, if we need to map it to a
1265 /// different "real" type, it can be done so here.
1266 /// This is useful to work around limitations in the binding type resolver, where we reference
1267 /// a non-public `use` alias.
1268 /// TODO: We should never need to use this!
1269 fn real_rust_type_mapping<'equiv>(&self, thing: &'equiv str) -> &'equiv str {
1271 "lightning::io::Read" => "crate::c_types::io::Read",
1276 // ****************************
1277 // *** Container Processing ***
1278 // ****************************
1280 /// Returns the module path in the generated mapping crate to the containers which we generate
1281 /// when writing to CrateTypes::template_file.
1282 pub fn generated_container_path() -> &'static str {
1283 "crate::c_types::derived"
1285 /// Returns the module path in the generated mapping crate to the container templates, which
1286 /// are then concretized and put in the generated container path/template_file.
1287 fn container_templ_path() -> &'static str {
1291 /// Returns true if the path containing the given args is a "transparent" container, ie an
1292 /// Option or a container which does not require a generated continer class.
1293 fn is_transparent_container<'i, I: Iterator<Item=&'i syn::Type>>(&self, full_path: &str, _is_ref: bool, mut args: I, generics: Option<&GenericTypes>) -> bool {
1294 if full_path == "Option" {
1295 let inner = args.next().unwrap();
1296 assert!(args.next().is_none());
1298 syn::Type::Reference(_) => true,
1299 syn::Type::Array(a) => {
1300 if let syn::Expr::Lit(l) = &a.len {
1301 if let syn::Lit::Int(i) = &l.lit {
1302 if i.base10_digits().parse::<usize>().unwrap() >= 32 {
1303 let mut buf = Vec::new();
1304 self.write_rust_type(&mut buf, generics, &a.elem);
1305 let ty = String::from_utf8(buf).unwrap();
1308 // Blindly assume that if we're trying to create an empty value for an
1309 // array < 32 entries that all-0s may be a valid state.
1312 } else { unimplemented!(); }
1313 } else { unimplemented!(); }
1315 syn::Type::Path(p) => {
1316 if let Some(resolved) = self.maybe_resolve_path(&p.path, generics) {
1317 if self.c_type_has_inner_from_path(&resolved) { return true; }
1318 if self.is_primitive(&resolved) { return false; }
1319 if self.c_type_from_path(&resolved, false, false).is_some() { true } else { false }
1322 syn::Type::Tuple(_) => false,
1323 _ => unimplemented!(),
1327 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1328 /// not require a generated continer class.
1329 pub fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1330 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1331 syn::PathArguments::None => return false,
1332 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1333 if let syn::GenericArgument::Type(ref ty) = arg {
1335 } else { unimplemented!() }
1337 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1339 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter, generics)
1341 /// Returns true if this is a known, supported, non-transparent container.
1342 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1343 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1345 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)
1346 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1347 // expecting one element in the vec per generic type, each of which is inline-converted
1348 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1350 "Result" if !is_ref => {
1352 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1353 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1354 ").into() }", ContainerPrefixLocation::PerConv))
1358 // We should only get here if the single contained has an inner
1359 assert!(self.c_type_has_inner(single_contained.unwrap()));
1361 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1364 if let Some(syn::Type::Reference(_)) = single_contained {
1365 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "(*item)".to_string())], "); }", ContainerPrefixLocation::PerConv))
1367 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1371 let contained_struct = if let Some(syn::Type::Path(p)) = single_contained {
1372 Some(self.resolve_path(&p.path, generics))
1373 } else if let Some(syn::Type::Reference(r)) = single_contained {
1374 if let syn::Type::Path(p) = &*r.elem {
1375 Some(self.resolve_path(&p.path, generics))
1378 if let Some(inner_path) = contained_struct {
1379 if self.c_type_has_inner_from_path(&inner_path) {
1380 let is_inner_ref = if let Some(syn::Type::Reference(_)) = single_contained { true } else { false };
1382 return Some(("if ", vec![
1383 (".is_none() { core::ptr::null() } else { ObjOps::nonnull_ptr_to_inner(".to_owned(),
1384 format!("({}{}.unwrap())", var_access, if is_inner_ref { "" } else { ".as_ref()" }))
1385 ], ") }", ContainerPrefixLocation::OutsideConv));
1387 return Some(("if ", vec![
1388 (".is_none() { core::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1389 ], " }", ContainerPrefixLocation::OutsideConv));
1391 } else if self.is_primitive(&inner_path) || self.c_type_from_path(&inner_path, false, false).is_none() {
1392 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1393 return Some(("if ", vec![
1394 (format!(".is_none() {{ {}::None }} else {{ {}::Some(",
1395 inner_name, inner_name),
1396 format!("{}.unwrap()", var_access))
1397 ], ") }", ContainerPrefixLocation::PerConv));
1399 // If c_type_from_path is some (ie there's a manual mapping for the inner
1400 // type), lean on write_empty_rust_val, below.
1403 if let Some(t) = single_contained {
1404 if let syn::Type::Tuple(syn::TypeTuple { elems, .. }) = t {
1405 assert!(elems.is_empty());
1406 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1407 return Some(("if ", vec![
1408 (format!(".is_none() {{ {}::None }} else {{ {}::Some /*",
1409 inner_name, inner_name), format!(""))
1410 ], " */}", ContainerPrefixLocation::PerConv));
1412 if let syn::Type::Reference(syn::TypeReference { elem, .. }) = t {
1413 if let syn::Type::Slice(_) = &**elem {
1414 return Some(("if ", vec![
1415 (".is_none() { SmartPtr::null() } else { SmartPtr::from_obj(".to_string(),
1416 format!("({}.unwrap())", var_access))
1417 ], ") }", ContainerPrefixLocation::PerConv));
1420 let mut v = Vec::new();
1421 self.write_empty_rust_val(generics, &mut v, t);
1422 let s = String::from_utf8(v).unwrap();
1423 return Some(("if ", vec![
1424 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1425 ], " }", ContainerPrefixLocation::PerConv));
1426 } else { unreachable!(); }
1432 /// only_contained_has_inner implies that there is only one contained element in the container
1433 /// and it has an inner field (ie is an "opaque" type we've defined).
1434 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)
1435 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1436 // expecting one element in the vec per generic type, each of which is inline-converted
1437 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1439 "Result" if !is_ref => {
1441 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1442 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1443 ")}", ContainerPrefixLocation::PerConv))
1445 "Slice" if is_ref => {
1446 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1449 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1452 if let Some(syn::Type::Path(p)) = single_contained {
1453 let inner_path = self.resolve_path(&p.path, generics);
1454 if self.is_primitive(&inner_path) {
1455 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1456 } else if self.c_type_has_inner_from_path(&inner_path) {
1458 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1460 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1465 if let Some(t) = single_contained {
1467 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_) => {
1468 let mut v = Vec::new();
1469 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1470 let s = String::from_utf8(v).unwrap();
1472 EmptyValExpectedTy::ReferenceAsPointer =>
1473 return Some(("if ", vec![
1474 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1475 ], ") }", ContainerPrefixLocation::NoPrefix)),
1476 EmptyValExpectedTy::OptionType =>
1477 return Some(("{ /* ", vec![
1478 (format!("*/ let {}_opt = {};", var_name, var_access),
1479 format!("}} if {}_opt{} {{ None }} else {{ Some({{ {}_opt.take()", var_name, s, var_name))
1480 ], ") } }", ContainerPrefixLocation::PerConv)),
1481 EmptyValExpectedTy::NonPointer =>
1482 return Some(("if ", vec![
1483 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1484 ], ") }", ContainerPrefixLocation::PerConv)),
1487 syn::Type::Tuple(_) => {
1488 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1490 _ => unimplemented!(),
1492 } else { unreachable!(); }
1498 /// Constructs a reference to the given type, possibly tweaking the type if relevant to make it
1499 /// convertable to C.
1500 pub fn create_ownable_reference(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> Option<syn::Type> {
1501 let default_value = Some(syn::Type::Reference(syn::TypeReference {
1502 and_token: syn::Token!(&)(Span::call_site()), lifetime: None, mutability: None,
1503 elem: Box::new(t.clone()) }));
1504 match generics.resolve_type(t) {
1505 syn::Type::Path(p) => {
1506 if let Some(resolved_path) = self.maybe_resolve_path(&p.path, generics) {
1507 if resolved_path != "Vec" { return default_value; }
1508 if p.path.segments.len() != 1 { unimplemented!(); }
1509 let only_seg = p.path.segments.iter().next().unwrap();
1510 if let syn::PathArguments::AngleBracketed(args) = &only_seg.arguments {
1511 if args.args.len() != 1 { unimplemented!(); }
1512 let inner_arg = args.args.iter().next().unwrap();
1513 if let syn::GenericArgument::Type(ty) = &inner_arg {
1514 let mut can_create = self.c_type_has_inner(&ty);
1515 if let syn::Type::Path(inner) = ty {
1516 if inner.path.segments.len() == 1 &&
1517 format!("{}", inner.path.segments[0].ident) == "Vec" {
1521 if !can_create { return default_value; }
1522 if let Some(inner_ty) = self.create_ownable_reference(&ty, generics) {
1523 return Some(syn::Type::Reference(syn::TypeReference {
1524 and_token: syn::Token![&](Span::call_site()),
1527 elem: Box::new(syn::Type::Slice(syn::TypeSlice {
1528 bracket_token: syn::token::Bracket { span: Span::call_site() },
1529 elem: Box::new(inner_ty)
1532 } else { return default_value; }
1533 } else { unimplemented!(); }
1534 } else { unimplemented!(); }
1535 } else { return None; }
1541 // *************************************************
1542 // *** Type definition during main.rs processing ***
1543 // *************************************************
1545 pub fn get_declared_type(&'a self, ident: &syn::Ident) -> Option<&'a DeclType<'c>> {
1546 self.types.get_declared_type(ident)
1548 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1549 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool {
1550 self.crate_types.opaques.get(full_path).is_some()
1553 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1554 pub fn c_type_has_inner(&self, ty: &syn::Type) -> bool {
1556 syn::Type::Path(p) => {
1557 if let Some(full_path) = self.maybe_resolve_path(&p.path, None) {
1558 self.c_type_has_inner_from_path(&full_path)
1561 syn::Type::Reference(r) => {
1562 self.c_type_has_inner(&*r.elem)
1568 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1569 self.types.maybe_resolve_ident(id)
1572 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
1573 self.types.maybe_resolve_non_ignored_ident(id)
1576 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1577 self.types.maybe_resolve_path(p_arg, generics)
1579 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1580 self.maybe_resolve_path(p, generics).unwrap()
1583 // ***********************************
1584 // *** Original Rust Type Printing ***
1585 // ***********************************
1587 fn in_rust_prelude(resolved_path: &str) -> bool {
1588 match resolved_path {
1596 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path) {
1597 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1598 if self.is_primitive(&resolved) {
1599 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1601 // TODO: We should have a generic "is from a dependency" check here instead of
1602 // checking for "bitcoin" explicitly.
1603 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1604 write!(w, "{}", resolved).unwrap();
1605 // If we're printing a generic argument, it needs to reference the crate, otherwise
1606 // the original crate:
1607 } else if self.maybe_resolve_path(&path, None).as_ref() == Some(&resolved) {
1608 write!(w, "{}", self.real_rust_type_mapping(&resolved)).unwrap();
1610 write!(w, "crate::{}", resolved).unwrap();
1613 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1614 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1617 if path.leading_colon.is_some() {
1618 write!(w, "::").unwrap();
1620 for (idx, seg) in path.segments.iter().enumerate() {
1621 if idx != 0 { write!(w, "::").unwrap(); }
1622 write!(w, "{}", seg.ident).unwrap();
1623 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1624 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1629 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>) {
1630 let mut had_params = false;
1631 for (idx, arg) in generics.enumerate() {
1632 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1635 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1636 syn::GenericParam::Type(t) => {
1637 write!(w, "{}", t.ident).unwrap();
1638 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1639 for (idx, bound) in t.bounds.iter().enumerate() {
1640 if idx != 0 { write!(w, " + ").unwrap(); }
1642 syn::TypeParamBound::Trait(tb) => {
1643 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1644 self.write_rust_path(w, generics_resolver, &tb.path);
1646 _ => unimplemented!(),
1649 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1651 _ => unimplemented!(),
1654 if had_params { write!(w, ">").unwrap(); }
1657 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>) {
1658 write!(w, "<").unwrap();
1659 for (idx, arg) in generics.enumerate() {
1660 if idx != 0 { write!(w, ", ").unwrap(); }
1662 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t),
1663 _ => unimplemented!(),
1666 write!(w, ">").unwrap();
1668 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
1670 syn::Type::Path(p) => {
1671 if p.qself.is_some() {
1674 self.write_rust_path(w, generics, &p.path);
1676 syn::Type::Reference(r) => {
1677 write!(w, "&").unwrap();
1678 if let Some(lft) = &r.lifetime {
1679 write!(w, "'{} ", lft.ident).unwrap();
1681 if r.mutability.is_some() {
1682 write!(w, "mut ").unwrap();
1684 self.write_rust_type(w, generics, &*r.elem);
1686 syn::Type::Array(a) => {
1687 write!(w, "[").unwrap();
1688 self.write_rust_type(w, generics, &a.elem);
1689 if let syn::Expr::Lit(l) = &a.len {
1690 if let syn::Lit::Int(i) = &l.lit {
1691 write!(w, "; {}]", i).unwrap();
1692 } else { unimplemented!(); }
1693 } else { unimplemented!(); }
1695 syn::Type::Slice(s) => {
1696 write!(w, "[").unwrap();
1697 self.write_rust_type(w, generics, &s.elem);
1698 write!(w, "]").unwrap();
1700 syn::Type::Tuple(s) => {
1701 write!(w, "(").unwrap();
1702 for (idx, t) in s.elems.iter().enumerate() {
1703 if idx != 0 { write!(w, ", ").unwrap(); }
1704 self.write_rust_type(w, generics, &t);
1706 write!(w, ")").unwrap();
1708 _ => unimplemented!(),
1712 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1713 /// unint'd memory).
1714 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1716 syn::Type::Reference(r) => {
1717 self.write_empty_rust_val(generics, w, &*r.elem)
1719 syn::Type::Path(p) => {
1720 let resolved = self.resolve_path(&p.path, generics);
1721 if self.crate_types.opaques.get(&resolved).is_some() {
1722 write!(w, "crate::{} {{ inner: core::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1724 // Assume its a manually-mapped C type, where we can just define an null() fn
1725 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1728 syn::Type::Array(a) => {
1729 if let syn::Expr::Lit(l) = &a.len {
1730 if let syn::Lit::Int(i) = &l.lit {
1731 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1732 // Blindly assume that if we're trying to create an empty value for an
1733 // array < 32 entries that all-0s may be a valid state.
1736 let arrty = format!("[u8; {}]", i.base10_digits());
1737 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1738 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1739 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1740 } else { unimplemented!(); }
1741 } else { unimplemented!(); }
1743 _ => unimplemented!(),
1747 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1748 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1749 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1750 let mut split = real_ty.split("; ");
1751 split.next().unwrap();
1752 let tail_str = split.next().unwrap();
1753 assert!(split.next().is_none());
1754 let len = usize::from_str_radix(&tail_str[..tail_str.len() - 1], 10).unwrap();
1755 Some(parse_quote!([u8; #len]))
1760 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1761 /// See EmptyValExpectedTy for information on return types.
1762 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1764 syn::Type::Reference(r) => {
1765 return self.write_empty_rust_val_check_suffix(generics, w, &*r.elem);
1767 syn::Type::Path(p) => {
1768 let resolved = self.resolve_path(&p.path, generics);
1769 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1770 write!(w, ".data").unwrap();
1771 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1773 if self.crate_types.opaques.get(&resolved).is_some() {
1774 write!(w, ".inner.is_null()").unwrap();
1775 EmptyValExpectedTy::NonPointer
1777 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1778 write!(w, "{}", suffix).unwrap();
1779 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1780 EmptyValExpectedTy::NonPointer
1782 write!(w, ".is_none()").unwrap();
1783 EmptyValExpectedTy::OptionType
1787 syn::Type::Array(a) => {
1788 if let syn::Expr::Lit(l) = &a.len {
1789 if let syn::Lit::Int(i) = &l.lit {
1790 write!(w, " == [0; {}]", i.base10_digits()).unwrap();
1791 EmptyValExpectedTy::NonPointer
1792 } else { unimplemented!(); }
1793 } else { unimplemented!(); }
1795 syn::Type::Slice(_) => {
1796 // Option<[]> always implies that we want to treat len() == 0 differently from
1797 // None, so we always map an Option<[]> into a pointer.
1798 write!(w, " == core::ptr::null_mut()").unwrap();
1799 EmptyValExpectedTy::ReferenceAsPointer
1801 _ => unimplemented!(),
1805 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1806 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
1808 syn::Type::Reference(r) => {
1809 self.write_empty_rust_val_check(generics, w, &*r.elem, var_access);
1811 syn::Type::Path(_) => {
1812 write!(w, "{}", var_access).unwrap();
1813 self.write_empty_rust_val_check_suffix(generics, w, t);
1815 syn::Type::Array(a) => {
1816 if let syn::Expr::Lit(l) = &a.len {
1817 if let syn::Lit::Int(i) = &l.lit {
1818 let arrty = format!("[u8; {}]", i.base10_digits());
1819 // We don't (yet) support a new-var conversion here.
1820 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
1822 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
1824 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
1825 self.write_empty_rust_val_check_suffix(generics, w, t);
1826 } else { unimplemented!(); }
1827 } else { unimplemented!(); }
1829 _ => unimplemented!(),
1833 // ********************************
1834 // *** Type conversion printing ***
1835 // ********************************
1837 /// Returns true we if can just skip passing this to C entirely
1838 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
1840 syn::Type::Path(p) => {
1841 if p.qself.is_some() { unimplemented!(); }
1842 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1843 self.skip_path(&full_path)
1846 syn::Type::Reference(r) => {
1847 self.skip_arg(&*r.elem, generics)
1852 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1854 syn::Type::Path(p) => {
1855 if p.qself.is_some() { unimplemented!(); }
1856 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1857 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
1860 syn::Type::Reference(r) => {
1861 self.no_arg_to_rust(w, &*r.elem, generics);
1867 fn write_conversion_inline_intern<W: std::io::Write,
1868 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool, Option<&str>) -> String>
1869 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
1870 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
1871 match generics.resolve_type(t) {
1872 syn::Type::Reference(r) => {
1873 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
1874 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1876 syn::Type::Path(p) => {
1877 if p.qself.is_some() {
1881 let resolved_path = self.resolve_path(&p.path, generics);
1882 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1883 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1884 } else if self.is_primitive(&resolved_path) {
1885 if is_ref && prefix {
1886 write!(w, "*").unwrap();
1888 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
1889 write!(w, "{}", c_type).unwrap();
1890 } else if let Some((_, generics)) = self.crate_types.opaques.get(&resolved_path) {
1891 decl_lookup(w, &DeclType::StructImported { generics: &generics }, &resolved_path, is_ref, is_mut);
1892 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
1893 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
1894 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
1895 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
1896 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
1897 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
1898 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
1899 } else { unimplemented!(); }
1900 } else { unimplemented!(); }
1902 syn::Type::Array(a) => {
1903 // We assume all arrays contain only [int_literal; X]s.
1904 // This may result in some outputs not compiling.
1905 if let syn::Expr::Lit(l) = &a.len {
1906 if let syn::Lit::Int(i) = &l.lit {
1907 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
1908 } else { unimplemented!(); }
1909 } else { unimplemented!(); }
1911 syn::Type::Slice(s) => {
1912 // We assume all slices contain only literals or references.
1913 // This may result in some outputs not compiling.
1914 if let syn::Type::Path(p) = &*s.elem {
1915 let resolved = self.resolve_path(&p.path, generics);
1916 if self.is_primitive(&resolved) {
1917 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
1919 write!(w, "{}", sliceconv(true, None)).unwrap();
1921 } else if let syn::Type::Reference(r) = &*s.elem {
1922 if let syn::Type::Path(p) = &*r.elem {
1923 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)), None)).unwrap();
1924 } else if let syn::Type::Slice(_) = &*r.elem {
1925 write!(w, "{}", sliceconv(false, None)).unwrap();
1926 } else { unimplemented!(); }
1927 } else if let syn::Type::Tuple(t) = &*s.elem {
1928 assert!(!t.elems.is_empty());
1930 write!(w, "{}", sliceconv(false, None)).unwrap();
1932 let mut needs_map = false;
1933 for e in t.elems.iter() {
1934 if let syn::Type::Reference(_) = e {
1939 let mut map_str = Vec::new();
1940 write!(&mut map_str, ".map(|(").unwrap();
1941 for i in 0..t.elems.len() {
1942 write!(&mut map_str, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
1944 write!(&mut map_str, ")| (").unwrap();
1945 for (idx, e) in t.elems.iter().enumerate() {
1946 if let syn::Type::Reference(_) = e {
1947 write!(&mut map_str, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1948 } else if let syn::Type::Path(_) = e {
1949 write!(&mut map_str, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1950 } else { unimplemented!(); }
1952 write!(&mut map_str, "))").unwrap();
1953 write!(w, "{}", sliceconv(false, Some(&String::from_utf8(map_str).unwrap()))).unwrap();
1955 write!(w, "{}", sliceconv(false, None)).unwrap();
1958 } else { unimplemented!(); }
1960 syn::Type::Tuple(t) => {
1961 if t.elems.is_empty() {
1962 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
1963 // so work around it by just pretending its a 0u8
1964 write!(w, "{}", tupleconv).unwrap();
1966 if prefix { write!(w, "local_").unwrap(); }
1969 _ => unimplemented!(),
1973 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) {
1974 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "() /*", true, |_, _| "local_".to_owned(),
1975 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
1976 |w, decl_type, decl_path, is_ref, _is_mut| {
1978 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(", decl_path).unwrap(),
1979 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(", decl_path).unwrap(),
1980 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
1981 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref && from_ptr => {
1982 if !ptr_for_ref { write!(w, "&").unwrap(); }
1983 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap()
1985 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref => {
1986 if !ptr_for_ref { write!(w, "&").unwrap(); }
1987 write!(w, "crate::{} {{ inner: unsafe {{ ObjOps::nonnull_ptr_to_inner((", decl_path).unwrap()
1989 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
1990 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
1991 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref =>
1992 write!(w, "crate::{} {{ inner: ObjOps::heap_alloc(", decl_path).unwrap(),
1993 DeclType::Trait(_) if is_ref => write!(w, "").unwrap(),
1994 DeclType::Trait(_) if !is_ref => write!(w, "Into::into(").unwrap(),
1995 _ => panic!("{:?}", decl_path),
1999 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) {
2000 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
2002 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) {
2003 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_, _| ".into()".to_owned(),
2004 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
2005 |w, decl_type, full_path, is_ref, _is_mut| match decl_type {
2006 DeclType::MirroredEnum => write!(w, ")").unwrap(),
2007 DeclType::EnumIgnored { generics }|DeclType::StructImported { generics } if is_ref => {
2008 write!(w, " as *const {}<", full_path).unwrap();
2009 for param in generics.params.iter() {
2010 if let syn::GenericParam::Lifetime(_) = param {
2011 write!(w, "'_, ").unwrap();
2013 write!(w, "_, ").unwrap();
2017 write!(w, ">) as *mut _ }}, is_owned: false }}").unwrap();
2019 write!(w, ">) as *mut _) }}, is_owned: false }}").unwrap();
2022 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2023 write!(w, ", is_owned: true }}").unwrap(),
2024 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref => write!(w, "), is_owned: true }}").unwrap(),
2025 DeclType::Trait(_) if is_ref => {},
2026 DeclType::Trait(_) => {
2027 // This is used when we're converting a concrete Rust type into a C trait
2028 // for use when a Rust trait method returns an associated type.
2029 // Because all of our C traits implement From<RustTypesImplementingTraits>
2030 // we can just call .into() here and be done.
2031 write!(w, ")").unwrap()
2033 _ => unimplemented!(),
2036 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) {
2037 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
2040 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) {
2041 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2042 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
2043 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2044 DeclType::StructImported {..} if is_ref => write!(w, "").unwrap(),
2045 DeclType::StructImported {..} if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
2046 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
2047 DeclType::MirroredEnum => {},
2048 DeclType::Trait(_) => {},
2049 _ => unimplemented!(),
2052 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2053 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
2055 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) {
2056 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
2057 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2058 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2059 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2060 (true, None) => "[..]".to_owned(),
2061 (true, Some(_)) => unreachable!(),
2063 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2064 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
2065 DeclType::StructImported {..} if is_ref && ptr_for_ref => write!(w, "XXX unimplemented").unwrap(),
2066 DeclType::StructImported {..} if is_mut && is_ref => write!(w, ".get_native_mut_ref()").unwrap(),
2067 DeclType::StructImported {..} if is_ref => write!(w, ".get_native_ref()").unwrap(),
2068 DeclType::StructImported {..} if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
2069 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
2070 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
2071 DeclType::Trait(_) => {},
2072 _ => unimplemented!(),
2075 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2076 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
2078 // Note that compared to the above conversion functions, the following two are generally
2079 // significantly undertested:
2080 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2081 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2083 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
2084 Some(format!("&{}", conv))
2087 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2088 DeclType::StructImported {..} if !is_ref => write!(w, "").unwrap(),
2089 _ => unimplemented!(),
2092 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2093 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
2094 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2095 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2096 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2097 (true, None) => "[..]".to_owned(),
2098 (true, Some(_)) => unreachable!(),
2100 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2101 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2102 DeclType::StructImported {..} if !is_ref => write!(w, ".get_native_ref()").unwrap(),
2103 _ => unimplemented!(),
2107 fn write_conversion_new_var_intern<'b, W: std::io::Write,
2108 LP: Fn(&str, bool) -> Option<(&str, &str)>,
2109 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
2110 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
2111 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
2112 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
2113 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool, from_ownable_ref: bool,
2114 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
2116 macro_rules! convert_container {
2117 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
2118 // For slices (and Options), we refuse to directly map them as is_ref when they
2119 // aren't opaque types containing an inner pointer. This is due to the fact that,
2120 // in both cases, the actual higher-level type is non-is_ref.
2121 let ty_has_inner = if $args_len == 1 {
2122 let ty = $args_iter().next().unwrap();
2123 if $container_type == "Slice" && to_c {
2124 // "To C ptr_for_ref" means "return the regular object with is_owned
2125 // set to false", which is totally what we want in a slice if we're about to
2126 // set ty_has_inner.
2129 if let syn::Type::Reference(t) = ty {
2130 if let syn::Type::Path(p) = &*t.elem {
2131 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2133 } else if let syn::Type::Path(p) = ty {
2134 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2138 // Options get a bunch of special handling, since in general we map Option<>al
2139 // types into the same C type as non-Option-wrapped types. This ends up being
2140 // pretty manual here and most of the below special-cases are for Options.
2141 let mut needs_ref_map = false;
2142 let mut only_contained_type = None;
2143 let mut only_contained_type_nonref = None;
2144 let mut only_contained_has_inner = false;
2145 let mut contains_slice = false;
2147 only_contained_has_inner = ty_has_inner;
2148 let arg = $args_iter().next().unwrap();
2149 if let syn::Type::Reference(t) = arg {
2150 only_contained_type = Some(arg);
2151 only_contained_type_nonref = Some(&*t.elem);
2152 if let syn::Type::Path(_) = &*t.elem {
2154 } else if let syn::Type::Slice(_) = &*t.elem {
2155 contains_slice = true;
2156 } else { return false; }
2157 // If the inner element contains an inner pointer, we will just use that,
2158 // avoiding the need to map elements to references. Otherwise we'll need to
2159 // do an extra mapping step.
2160 needs_ref_map = !only_contained_has_inner && $container_type == "Option";
2162 only_contained_type = Some(arg);
2163 only_contained_type_nonref = Some(arg);
2167 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref && ty_has_inner, only_contained_type, ident, var) {
2168 assert_eq!(conversions.len(), $args_len);
2169 write!(w, "let mut local_{}{} = ", ident,
2170 if (!to_c && needs_ref_map) || (to_c && $container_type == "Option" && contains_slice) {"_base"} else { "" }).unwrap();
2171 if prefix_location == ContainerPrefixLocation::OutsideConv {
2172 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2174 write!(w, "{}{}", prefix, var).unwrap();
2176 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
2177 let mut var = std::io::Cursor::new(Vec::new());
2178 write!(&mut var, "{}", var_name).unwrap();
2179 let var_access = String::from_utf8(var.into_inner()).unwrap();
2181 let conv_ty = if needs_ref_map { only_contained_type_nonref.as_ref().unwrap() } else { ty };
2183 write!(w, "{} {{ ", pfx).unwrap();
2184 let new_var_name = format!("{}_{}", ident, idx);
2185 let new_var = self.write_conversion_new_var_intern(w, &format_ident!("{}", new_var_name),
2186 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref,
2187 to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2188 if new_var { write!(w, " ").unwrap(); }
2190 if prefix_location == ContainerPrefixLocation::PerConv {
2191 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2192 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2193 write!(w, "ObjOps::heap_alloc(").unwrap();
2196 write!(w, "{}{}", if contains_slice && !to_c { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
2197 if prefix_location == ContainerPrefixLocation::PerConv {
2198 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2199 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2200 write!(w, ")").unwrap();
2202 write!(w, " }}").unwrap();
2204 write!(w, "{}", suffix).unwrap();
2205 if prefix_location == ContainerPrefixLocation::OutsideConv {
2206 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2208 write!(w, ";").unwrap();
2209 if !to_c && needs_ref_map {
2210 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
2212 write!(w, ".map(|a| &a[..])").unwrap();
2214 write!(w, ";").unwrap();
2215 } else if to_c && $container_type == "Option" && contains_slice {
2216 write!(w, " let mut local_{} = *local_{}_base;", ident, ident).unwrap();
2223 match generics.resolve_type(t) {
2224 syn::Type::Reference(r) => {
2225 if let syn::Type::Slice(_) = &*r.elem {
2226 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, is_ref, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix)
2228 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, true, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix)
2231 syn::Type::Path(p) => {
2232 if p.qself.is_some() {
2235 let resolved_path = self.resolve_path(&p.path, generics);
2236 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
2237 return self.write_conversion_new_var_intern(w, ident, var, aliased_type, None, is_ref, ptr_for_ref, to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2239 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2240 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
2241 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
2242 if let syn::GenericArgument::Type(ty) = arg {
2243 generics.resolve_type(ty)
2244 } else { unimplemented!(); }
2246 } else { unimplemented!(); }
2248 if self.is_primitive(&resolved_path) {
2250 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
2251 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
2252 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2254 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
2259 syn::Type::Array(_) => {
2260 // We assume all arrays contain only primitive types.
2261 // This may result in some outputs not compiling.
2264 syn::Type::Slice(s) => {
2265 if let syn::Type::Path(p) = &*s.elem {
2266 let resolved = self.resolve_path(&p.path, generics);
2267 if self.is_primitive(&resolved) {
2268 let slice_path = format!("[{}]", resolved);
2269 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
2270 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2274 let tyref = [&*s.elem];
2276 // If we're converting from a slice to a Vec, assume we can clone the
2277 // elements and clone them into a new Vec first. Next we'll walk the
2278 // new Vec here and convert them to C types.
2279 write!(w, "let mut local_{}_clone = Vec::new(); local_{}_clone.extend_from_slice({}); let mut {} = local_{}_clone; ", ident, ident, ident, ident, ident).unwrap();
2282 convert_container!("Vec", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2283 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2285 } else if let syn::Type::Reference(ty) = &*s.elem {
2286 let tyref = if from_ownable_ref || !to_c { [&*ty.elem] } else { [&*s.elem] };
2288 convert_container!("Slice", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2289 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2290 } else if let syn::Type::Tuple(t) = &*s.elem {
2291 // When mapping into a temporary new var, we need to own all the underlying objects.
2292 // Thus, we drop any references inside the tuple and convert with non-reference types.
2293 let mut elems = syn::punctuated::Punctuated::new();
2294 for elem in t.elems.iter() {
2295 if let syn::Type::Reference(r) = elem {
2296 elems.push((*r.elem).clone());
2298 elems.push(elem.clone());
2301 let ty = [syn::Type::Tuple(syn::TypeTuple {
2302 paren_token: t.paren_token, elems
2306 convert_container!("Slice", 1, || ty.iter());
2307 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2308 } else { unimplemented!() }
2310 syn::Type::Tuple(t) => {
2311 if !t.elems.is_empty() {
2312 // We don't (yet) support tuple elements which cannot be converted inline
2313 write!(w, "let (").unwrap();
2314 for idx in 0..t.elems.len() {
2315 if idx != 0 { write!(w, ", ").unwrap(); }
2316 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
2318 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
2319 // Like other template types, tuples are always mapped as their non-ref
2320 // versions for types which have different ref mappings. Thus, we convert to
2321 // non-ref versions and handle opaque types with inner pointers manually.
2322 for (idx, elem) in t.elems.iter().enumerate() {
2323 if let syn::Type::Path(p) = elem {
2324 let v_name = format!("orig_{}_{}", ident, idx);
2325 let tuple_elem_ident = format_ident!("{}", &v_name);
2326 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
2327 false, ptr_for_ref, to_c, from_ownable_ref,
2328 path_lookup, container_lookup, var_prefix, var_suffix) {
2329 write!(w, " ").unwrap();
2330 // Opaque types with inner pointers shouldn't ever create new stack
2331 // variables, so we don't handle it and just assert that it doesn't
2333 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
2337 write!(w, "let mut local_{} = (", ident).unwrap();
2338 for (idx, elem) in t.elems.iter().enumerate() {
2339 let ty_has_inner = {
2341 // "To C ptr_for_ref" means "return the regular object with
2342 // is_owned set to false", which is totally what we want
2343 // if we're about to set ty_has_inner.
2346 if let syn::Type::Reference(t) = elem {
2347 if let syn::Type::Path(p) = &*t.elem {
2348 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2350 } else if let syn::Type::Path(p) = elem {
2351 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2354 if idx != 0 { write!(w, ", ").unwrap(); }
2355 var_prefix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2356 if is_ref && ty_has_inner {
2357 // For ty_has_inner, the regular var_prefix mapping will take a
2358 // reference, so deref once here to make sure we keep the original ref.
2359 write!(w, "*").unwrap();
2361 write!(w, "orig_{}_{}", ident, idx).unwrap();
2362 if is_ref && !ty_has_inner {
2363 // If we don't have an inner variable's reference to maintain, just
2364 // hope the type is Clonable and use that.
2365 write!(w, ".clone()").unwrap();
2367 var_suffix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2369 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2373 _ => unimplemented!(),
2377 pub fn write_to_c_conversion_new_var_inner<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, var_access: &str, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool, from_ownable_ref: bool) -> bool {
2378 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, false, ptr_for_ref, true, from_ownable_ref,
2379 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2380 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2381 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2382 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2383 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2385 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 {
2386 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref, false)
2388 /// Prints new-var conversion for an "ownable_ref" type, ie prints conversion for
2389 /// `create_ownable_reference(t)`, not `t` itself.
2390 pub fn write_to_c_conversion_from_ownable_ref_new_var<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2391 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, true, true)
2393 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 {
2394 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false, false,
2395 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2396 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2397 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2398 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2399 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2402 // ******************************************************
2403 // *** C Container Type Equivalent and alias Printing ***
2404 // ******************************************************
2406 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 {
2407 for (idx, t) in args.enumerate() {
2409 write!(w, ", ").unwrap();
2411 if let syn::Type::Reference(r_arg) = t {
2412 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2414 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false, false) { return false; }
2416 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2417 // reference to something stupid, so check that the container is either opaque or a
2418 // predefined type (currently only Transaction).
2419 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2420 let resolved = self.resolve_path(&p_arg.path, generics);
2421 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2422 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2423 } else { unimplemented!(); }
2424 } else if let syn::Type::Path(p_arg) = t {
2425 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2426 if !self.is_primitive(&resolved) {
2427 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2430 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2432 if !self.write_c_type_intern(w, t, generics, false, false, false, false) { return false; }
2434 // We don't currently support outer reference types for non-primitive inners,
2435 // except for the empty tuple.
2436 if let syn::Type::Tuple(t_arg) = t {
2437 assert!(t_arg.elems.len() == 0 || !is_ref);
2441 if !self.write_c_type_intern(w, t, generics, false, false, false, false) { return false; }
2446 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2447 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2448 let mut created_container: Vec<u8> = Vec::new();
2450 if container_type == "Result" {
2451 let mut a_ty: Vec<u8> = Vec::new();
2452 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2453 if tup.elems.is_empty() {
2454 write!(&mut a_ty, "()").unwrap();
2456 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2459 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2462 let mut b_ty: Vec<u8> = Vec::new();
2463 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2464 if tup.elems.is_empty() {
2465 write!(&mut b_ty, "()").unwrap();
2467 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2470 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2473 let ok_str = String::from_utf8(a_ty).unwrap();
2474 let err_str = String::from_utf8(b_ty).unwrap();
2475 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2476 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2478 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2480 } else if container_type == "Vec" {
2481 let mut a_ty: Vec<u8> = Vec::new();
2482 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2483 let ty = String::from_utf8(a_ty).unwrap();
2484 let is_clonable = self.is_clonable(&ty);
2485 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2487 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2489 } else if container_type.ends_with("Tuple") {
2490 let mut tuple_args = Vec::new();
2491 let mut is_clonable = true;
2492 for arg in args.iter() {
2493 let mut ty: Vec<u8> = Vec::new();
2494 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2495 let ty_str = String::from_utf8(ty).unwrap();
2496 if !self.is_clonable(&ty_str) {
2497 is_clonable = false;
2499 tuple_args.push(ty_str);
2501 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2503 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2505 } else if container_type == "Option" {
2506 let mut a_ty: Vec<u8> = Vec::new();
2507 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2508 let ty = String::from_utf8(a_ty).unwrap();
2509 let is_clonable = self.is_clonable(&ty);
2510 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2512 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2517 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2521 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2522 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2523 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2524 } else { unimplemented!(); }
2526 fn write_c_mangled_container_path_intern<W: std::io::Write>
2527 (&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 {
2528 let mut mangled_type: Vec<u8> = Vec::new();
2529 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2530 write!(w, "C{}_", ident).unwrap();
2531 write!(mangled_type, "C{}_", ident).unwrap();
2532 } else { assert_eq!(args.len(), 1); }
2533 for arg in args.iter() {
2534 macro_rules! write_path {
2535 ($p_arg: expr, $extra_write: expr) => {
2536 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2537 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2539 if self.c_type_has_inner_from_path(&subtype) {
2540 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref, false) { return false; }
2542 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2543 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false, false) { return false; }
2545 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2546 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true, false) { return false; }
2550 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2552 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2553 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2554 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2557 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2558 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2559 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2560 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2561 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2564 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2565 write!(w, "{}", id).unwrap();
2566 write!(mangled_type, "{}", id).unwrap();
2567 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2568 write!(w2, "{}", id).unwrap();
2571 } else { return false; }
2574 match generics.resolve_type(arg) {
2575 syn::Type::Tuple(tuple) => {
2576 if tuple.elems.len() == 0 {
2577 write!(w, "None").unwrap();
2578 write!(mangled_type, "None").unwrap();
2580 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2582 // Figure out what the mangled type should look like. To disambiguate
2583 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2584 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2585 // available for use in type names.
2586 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2587 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2588 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2589 for elem in tuple.elems.iter() {
2590 if let syn::Type::Path(p) = elem {
2591 write_path!(p, Some(&mut mangled_tuple_type));
2592 } else if let syn::Type::Reference(refelem) = elem {
2593 if let syn::Type::Path(p) = &*refelem.elem {
2594 write_path!(p, Some(&mut mangled_tuple_type));
2595 } else { return false; }
2596 } else { return false; }
2598 write!(w, "Z").unwrap();
2599 write!(mangled_type, "Z").unwrap();
2600 write!(mangled_tuple_type, "Z").unwrap();
2601 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2602 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2607 syn::Type::Path(p_arg) => {
2608 write_path!(p_arg, None);
2610 syn::Type::Reference(refty) => {
2611 if let syn::Type::Path(p_arg) = &*refty.elem {
2612 write_path!(p_arg, None);
2613 } else if let syn::Type::Slice(_) = &*refty.elem {
2614 // write_c_type will actually do exactly what we want here, we just need to
2615 // make it a pointer so that its an option. Note that we cannot always convert
2616 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2617 // to edit it, hence we use *mut here instead of *const.
2618 if args.len() != 1 { return false; }
2619 write!(w, "*mut ").unwrap();
2620 self.write_c_type(w, arg, None, true);
2621 } else { return false; }
2623 syn::Type::Array(a) => {
2624 if let syn::Type::Path(p_arg) = &*a.elem {
2625 let resolved = self.resolve_path(&p_arg.path, generics);
2626 if !self.is_primitive(&resolved) { return false; }
2627 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2628 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2629 if in_type || args.len() != 1 {
2630 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2631 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2633 let arrty = format!("[{}; {}]", resolved, len.base10_digits());
2634 let realty = self.c_type_from_path(&arrty, is_ref, ptr_for_ref).unwrap_or(&arrty);
2635 write!(w, "{}", realty).unwrap();
2636 write!(mangled_type, "{}", realty).unwrap();
2638 } else { return false; }
2639 } else { return false; }
2641 _ => { return false; },
2644 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) { return true; }
2645 // Push the "end of type" Z
2646 write!(w, "Z").unwrap();
2647 write!(mangled_type, "Z").unwrap();
2649 // Make sure the type is actually defined:
2650 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2652 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 {
2653 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2654 write!(w, "{}::", Self::generated_container_path()).unwrap();
2656 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2658 pub fn get_c_mangled_container_type(&self, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, template_name: &str) -> Option<String> {
2659 let mut out = Vec::new();
2660 if !self.write_c_mangled_container_path(&mut out, args, generics, template_name, false, false, false) {
2663 Some(String::from_utf8(out).unwrap())
2666 // **********************************
2667 // *** C Type Equivalent Printing ***
2668 // **********************************
2670 fn write_c_path_intern<W: std::io::Write>(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool) -> bool {
2671 let full_path = match self.maybe_resolve_path(&path, generics) {
2672 Some(path) => path, None => return false };
2673 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2674 write!(w, "{}", c_type).unwrap();
2676 } else if self.crate_types.traits.get(&full_path).is_some() {
2677 if is_ref && ptr_for_ref {
2678 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2680 if with_ref_lifetime { unimplemented!(); }
2681 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2683 write!(w, "crate::{}", full_path).unwrap();
2686 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2687 if is_ref && ptr_for_ref {
2688 // ptr_for_ref implies we're returning the object, which we can't really do for
2689 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2690 // the actual object itself (for opaque types we'll set the pointer to the actual
2691 // type and note that its a reference).
2692 write!(w, "crate::{}", full_path).unwrap();
2693 } else if is_ref && with_ref_lifetime {
2695 // If we're concretizing something with a lifetime parameter, we have to pick a
2696 // lifetime, of which the only real available choice is `static`, obviously.
2697 write!(w, "&'static ").unwrap();
2698 self.write_rust_path(w, generics, path);
2700 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2702 write!(w, "crate::{}", full_path).unwrap();
2709 fn write_c_type_intern<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool) -> bool {
2710 match generics.resolve_type(t) {
2711 syn::Type::Path(p) => {
2712 if p.qself.is_some() {
2715 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2716 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2717 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);
2719 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2720 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref, with_ref_lifetime);
2723 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref, with_ref_lifetime)
2725 syn::Type::Reference(r) => {
2726 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref, with_ref_lifetime)
2728 syn::Type::Array(a) => {
2729 if is_ref && is_mut {
2730 write!(w, "*mut [").unwrap();
2731 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; }
2733 write!(w, "*const [").unwrap();
2734 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; }
2736 let mut typecheck = Vec::new();
2737 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; }
2738 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2740 if let syn::Expr::Lit(l) = &a.len {
2741 if let syn::Lit::Int(i) = &l.lit {
2743 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2744 write!(w, "{}", ty).unwrap();
2748 write!(w, "; {}]", i).unwrap();
2754 syn::Type::Slice(s) => {
2755 if !is_ref || is_mut { return false; }
2756 if let syn::Type::Path(p) = &*s.elem {
2757 let resolved = self.resolve_path(&p.path, generics);
2758 if self.is_primitive(&resolved) {
2759 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2762 let mut inner_c_ty = Vec::new();
2763 assert!(self.write_c_path_intern(&mut inner_c_ty, &p.path, generics, true, false, ptr_for_ref, with_ref_lifetime));
2764 if self.is_clonable(&String::from_utf8(inner_c_ty).unwrap()) {
2765 if let Some(id) = p.path.get_ident() {
2766 let mangled_container = format!("CVec_{}Z", id);
2767 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2768 self.check_create_container(mangled_container, "Vec", vec![&*s.elem], generics, false)
2772 } else if let syn::Type::Reference(r) = &*s.elem {
2773 if let syn::Type::Path(p) = &*r.elem {
2774 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
2775 let resolved = self.resolve_path(&p.path, generics);
2776 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2777 format!("CVec_{}Z", ident)
2778 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
2779 format!("CVec_{}Z", en.ident)
2780 } else if let Some(id) = p.path.get_ident() {
2781 format!("CVec_{}Z", id)
2782 } else { return false; };
2783 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2784 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
2785 } else if let syn::Type::Slice(sl2) = &*r.elem {
2786 if let syn::Type::Reference(r2) = &*sl2.elem {
2787 if let syn::Type::Path(p) = &*r2.elem {
2788 // Slices with slices with opaque types (with is_owned flags) are mapped as non-ref Vecs
2789 let resolved = self.resolve_path(&p.path, generics);
2790 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2791 format!("CVec_CVec_{}ZZ", ident)
2792 } else { return false; };
2793 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2794 let inner = &r2.elem;
2795 let vec_ty: syn::Type = syn::parse_quote!(Vec<#inner>);
2796 self.check_create_container(mangled_container, "Vec", vec![&vec_ty], generics, false)
2800 } else if let syn::Type::Tuple(_) = &*s.elem {
2801 let mut args = syn::punctuated::Punctuated::<_, syn::token::Comma>::new();
2802 args.push(syn::GenericArgument::Type((*s.elem).clone()));
2803 let mut segments = syn::punctuated::Punctuated::new();
2804 segments.push(parse_quote!(Vec<#args>));
2805 self.write_c_type_intern(w, &syn::Type::Path(syn::TypePath { qself: None, path: syn::Path { leading_colon: None, segments } }), generics, false, is_mut, ptr_for_ref, with_ref_lifetime)
2808 syn::Type::Tuple(t) => {
2809 if t.elems.len() == 0 {
2812 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
2813 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
2819 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2820 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, false));
2822 pub fn write_c_type_in_generic_param<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2823 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, true));
2825 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
2826 if p.leading_colon.is_some() { return false; }
2827 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false, false)
2829 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2830 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false, false)