1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE>
5 // or the MIT license <LICENSE-MIT>, at your option.
6 // You may not use this file except in accordance with one or both of these
9 use std::cell::RefCell;
10 use std::collections::{HashMap, HashSet};
17 use proc_macro2::{TokenTree, Span};
18 use quote::format_ident;
21 // The following utils are used purely to build our known types maps - they break down all the
22 // types we need to resolve to include the given object, and no more.
24 pub fn first_seg_self<'a>(t: &'a syn::Type) -> Option<impl Iterator<Item=&syn::PathSegment> + 'a> {
26 syn::Type::Path(p) => {
27 if p.qself.is_some() || p.path.leading_colon.is_some() {
30 let mut segs = p.path.segments.iter();
31 let ty = segs.next().unwrap();
32 if !ty.arguments.is_empty() { return None; }
33 if format!("{}", ty.ident) == "Self" {
41 pub fn get_single_remaining_path_seg<'a, I: Iterator<Item=&'a syn::PathSegment>>(segs: &mut I) -> Option<&'a syn::Ident> {
42 if let Some(ty) = segs.next() {
43 if !ty.arguments.is_empty() { unimplemented!(); }
44 if segs.next().is_some() { return None; }
49 pub fn first_seg_is_stdlib(first_seg_str: &str) -> bool {
50 first_seg_str == "std" || first_seg_str == "core" || first_seg_str == "alloc"
53 pub fn single_ident_generic_path_to_ident(p: &syn::Path) -> Option<&syn::Ident> {
54 if p.segments.len() == 1 {
55 Some(&p.segments.iter().next().unwrap().ident)
59 pub fn path_matches_nongeneric(p: &syn::Path, exp: &[&str]) -> bool {
60 if p.segments.len() != exp.len() { return false; }
61 for (seg, e) in p.segments.iter().zip(exp.iter()) {
62 if seg.arguments != syn::PathArguments::None { return false; }
63 if &format!("{}", seg.ident) != *e { return false; }
68 pub fn string_path_to_syn_path(path: &str) -> syn::Path {
69 let mut segments = syn::punctuated::Punctuated::new();
70 for seg in path.split("::") {
71 segments.push(syn::PathSegment {
72 ident: syn::Ident::new(seg, Span::call_site()),
73 arguments: syn::PathArguments::None,
76 syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments }
79 #[derive(Debug, PartialEq)]
80 pub enum ExportStatus {
84 /// This is used only for traits to indicate that users should not be able to implement their
85 /// own version of a trait, but we should export Rust implementations of the trait (and the
87 /// Concretly, this means that we do not implement the Rust trait for the C trait struct.
90 /// Gets the ExportStatus of an object (struct, fn, etc) given its attributes.
91 pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
92 for attr in attrs.iter() {
93 let tokens_clone = attr.tokens.clone();
94 let mut token_iter = tokens_clone.into_iter();
95 if let Some(token) = token_iter.next() {
97 TokenTree::Punct(c) if c.as_char() == '=' => {
98 // Really not sure where syn gets '=' from here -
99 // it somehow represents '///' or '//!'
101 TokenTree::Group(g) => {
102 if format!("{}", single_ident_generic_path_to_ident(&attr.path).unwrap()) == "cfg" {
103 let mut iter = g.stream().into_iter();
104 if let TokenTree::Ident(i) = iter.next().unwrap() {
106 // #[cfg(any(test, feature = ""))]
107 if let TokenTree::Group(g) = iter.next().unwrap() {
108 let mut all_test = true;
109 for token in g.stream().into_iter() {
110 if let TokenTree::Ident(i) = token {
111 match format!("{}", i).as_str() {
114 _ => all_test = false,
116 } else if let TokenTree::Literal(lit) = token {
117 if format!("{}", lit) != "fuzztarget" {
122 if all_test { return ExportStatus::TestOnly; }
124 } else if i == "test" {
125 return ExportStatus::TestOnly;
129 continue; // eg #[derive()]
131 _ => unimplemented!(),
134 match token_iter.next().unwrap() {
135 TokenTree::Literal(lit) => {
136 let line = format!("{}", lit);
137 if line.contains("(C-not exported)") {
138 return ExportStatus::NoExport;
139 } else if line.contains("(C-not implementable)") {
140 return ExportStatus::NotImplementable;
143 _ => unimplemented!(),
149 pub fn assert_simple_bound(bound: &syn::TraitBound) {
150 if bound.paren_token.is_some() || bound.lifetimes.is_some() { unimplemented!(); }
151 if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
154 /// Returns true if the enum will be mapped as an opaue (ie struct with a pointer to the underlying
155 /// type), otherwise it is mapped into a transparent, C-compatible version of itself.
156 pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool {
157 for var in e.variants.iter() {
158 if let syn::Fields::Named(fields) = &var.fields {
159 for field in fields.named.iter() {
160 match export_status(&field.attrs) {
161 ExportStatus::Export|ExportStatus::TestOnly => {},
162 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
163 ExportStatus::NoExport => return true,
166 } else if let syn::Fields::Unnamed(fields) = &var.fields {
167 for field in fields.unnamed.iter() {
168 match export_status(&field.attrs) {
169 ExportStatus::Export|ExportStatus::TestOnly => {},
170 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
171 ExportStatus::NoExport => return true,
179 /// A stack of sets of generic resolutions.
181 /// This tracks the template parameters for a function, struct, or trait, allowing resolution into
182 /// a concrete type. By pushing a new context onto the stack, this can track a function's template
183 /// parameters inside of a generic struct or trait.
185 /// It maps both direct types as well as Deref<Target = X>, mapping them via the provided
186 /// TypeResolver's resolve_path function (ie traits map to the concrete jump table, structs to the
187 /// concrete C container struct, etc).
189 pub struct GenericTypes<'a, 'b> {
190 self_ty: Option<String>,
191 parent: Option<&'b GenericTypes<'b, 'b>>,
192 typed_generics: HashMap<&'a syn::Ident, String>,
193 default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type)>,
195 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
196 pub fn new(self_ty: Option<String>) -> Self {
197 Self { self_ty, parent: None, typed_generics: HashMap::new(), default_generics: HashMap::new(), }
200 /// push a new context onto the stack, allowing for a new set of generics to be learned which
201 /// will override any lower contexts, but which will still fall back to resoltion via lower
203 pub fn push_ctx<'c>(&'c self) -> GenericTypes<'a, 'c> {
204 GenericTypes { self_ty: None, parent: Some(self), typed_generics: HashMap::new(), default_generics: HashMap::new(), }
207 /// Learn the generics in generics in the current context, given a TypeResolver.
208 pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
209 let mut new_typed_generics = HashMap::new();
210 // First learn simple generics...
211 for generic in generics.params.iter() {
213 syn::GenericParam::Type(type_param) => {
214 let mut non_lifetimes_processed = false;
215 'bound_loop: for bound in type_param.bounds.iter() {
216 if let syn::TypeParamBound::Trait(trait_bound) = bound {
217 if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
218 match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
220 if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
222 assert_simple_bound(&trait_bound);
223 if let Some(path) = types.maybe_resolve_path(&trait_bound.path, None) {
224 if types.skip_path(&path) { continue; }
225 if path == "Sized" { continue; }
226 if non_lifetimes_processed { return false; }
227 non_lifetimes_processed = true;
228 if path != "std::ops::Deref" && path != "core::ops::Deref" {
229 new_typed_generics.insert(&type_param.ident, Some(path));
231 // If we're templated on Deref<Target = ConcreteThing>, store
232 // the reference type in `default_generics` which handles full
233 // types and not just paths.
234 if let syn::PathArguments::AngleBracketed(ref args) =
235 trait_bound.path.segments[0].arguments {
236 assert_eq!(trait_bound.path.segments.len(), 1);
237 for subargument in args.args.iter() {
239 syn::GenericArgument::Lifetime(_) => {},
240 syn::GenericArgument::Binding(ref b) => {
241 if &format!("{}", b.ident) != "Target" { return false; }
243 self.default_generics.insert(&type_param.ident, (parse_quote!(&#default), parse_quote!(&#default)));
246 _ => unimplemented!(),
250 new_typed_generics.insert(&type_param.ident, None);
256 if let Some(default) = type_param.default.as_ref() {
257 assert!(type_param.bounds.is_empty());
258 self.default_generics.insert(&type_param.ident, (default.clone(), parse_quote!(&#default)));
264 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
265 if let Some(wh) = &generics.where_clause {
266 for pred in wh.predicates.iter() {
267 if let syn::WherePredicate::Type(t) = pred {
268 if let syn::Type::Path(p) = &t.bounded_ty {
269 if p.qself.is_some() { return false; }
270 if p.path.leading_colon.is_some() { return false; }
271 let mut p_iter = p.path.segments.iter();
272 let p_ident = &p_iter.next().unwrap().ident;
273 if let Some(gen) = new_typed_generics.get_mut(p_ident) {
274 if gen.is_some() { return false; }
275 if &format!("{}", p_iter.next().unwrap().ident) != "Target" {return false; }
277 let mut non_lifetimes_processed = false;
278 for bound in t.bounds.iter() {
279 if let syn::TypeParamBound::Trait(trait_bound) = bound {
280 if let Some(id) = trait_bound.path.get_ident() {
281 if format!("{}", id) == "Sized" { continue; }
283 if non_lifetimes_processed { return false; }
284 non_lifetimes_processed = true;
285 assert_simple_bound(&trait_bound);
286 let resolved = types.resolve_path(&trait_bound.path, None);
287 let ty = syn::Type::Path(syn::TypePath {
288 qself: None, path: string_path_to_syn_path(&resolved)
290 let ref_ty = parse_quote!(&#ty);
291 self.default_generics.insert(p_ident, (ty, ref_ty));
293 *gen = Some(resolved);
296 } else { return false; }
297 } else { return false; }
301 for (key, value) in new_typed_generics.drain() {
302 if let Some(v) = value {
303 assert!(self.typed_generics.insert(key, v).is_none());
304 } else { return false; }
309 /// Learn the associated types from the trait in the current context.
310 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
311 for item in t.items.iter() {
313 &syn::TraitItem::Type(ref t) => {
314 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
315 let mut bounds_iter = t.bounds.iter();
317 match bounds_iter.next().unwrap() {
318 syn::TypeParamBound::Trait(tr) => {
319 assert_simple_bound(&tr);
320 if let Some(path) = types.maybe_resolve_path(&tr.path, None) {
321 if types.skip_path(&path) { continue; }
322 // In general we handle Deref<Target=X> as if it were just X (and
323 // implement Deref<Target=Self> for relevant types). We don't
324 // bother to implement it for associated types, however, so we just
325 // ignore such bounds.
326 if path != "std::ops::Deref" && path != "core::ops::Deref" {
327 self.typed_generics.insert(&t.ident, path);
329 } else { unimplemented!(); }
330 for bound in bounds_iter {
331 if let syn::TypeParamBound::Trait(_) = bound { unimplemented!(); }
335 syn::TypeParamBound::Lifetime(_) => {},
344 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
346 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<&'b String> {
347 if let Some(ident) = path.get_ident() {
348 if let Some(ty) = &self.self_ty {
349 if format!("{}", ident) == "Self" {
353 if let Some(res) = self.typed_generics.get(ident) {
357 // Associated types are usually specified as "Self::Generic", so we check for that
359 let mut it = path.segments.iter();
360 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
361 let ident = &it.next().unwrap().ident;
362 if let Some(res) = self.typed_generics.get(ident) {
367 if let Some(parent) = self.parent {
368 parent.maybe_resolve_path(path)
375 pub trait ResolveType<'a> { fn resolve_type(&'a self, ty: &'a syn::Type) -> &'a syn::Type; }
376 impl<'a, 'b, 'c: 'a + 'b> ResolveType<'c> for Option<&GenericTypes<'a, 'b>> {
377 fn resolve_type(&'c self, ty: &'c syn::Type) -> &'c syn::Type {
378 if let Some(us) = self {
380 syn::Type::Path(p) => {
381 if let Some(ident) = p.path.get_ident() {
382 if let Some((ty, _)) = us.default_generics.get(ident) {
387 syn::Type::Reference(syn::TypeReference { elem, .. }) => {
388 if let syn::Type::Path(p) = &**elem {
389 if let Some(ident) = p.path.get_ident() {
390 if let Some((_, refty)) = us.default_generics.get(ident) {
398 us.parent.resolve_type(ty)
403 #[derive(Clone, PartialEq)]
404 // The type of declaration and the object itself
405 pub enum DeclType<'a> {
407 Trait(&'a syn::ItemTrait),
408 StructImported { generics: &'a syn::Generics },
410 EnumIgnored { generics: &'a syn::Generics },
413 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
414 pub crate_name: &'mod_lifetime str,
415 dependencies: &'mod_lifetime HashSet<syn::Ident>,
416 module_path: &'mod_lifetime str,
417 imports: HashMap<syn::Ident, (String, syn::Path)>,
418 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
419 priv_modules: HashSet<syn::Ident>,
421 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
422 fn process_use_intern(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>,
423 u: &syn::UseTree, partial_path: &str, mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>) {
426 macro_rules! push_path {
427 ($ident: expr, $path_suffix: expr) => {
428 if partial_path == "" && format!("{}", $ident) == "super" {
429 let mut mod_iter = module_path.rsplitn(2, "::");
430 mod_iter.next().unwrap();
431 let super_mod = mod_iter.next().unwrap();
432 new_path = format!("{}{}", super_mod, $path_suffix);
433 assert_eq!(path.len(), 0);
434 for module in super_mod.split("::") {
435 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
437 } else if partial_path == "" && format!("{}", $ident) == "self" {
438 new_path = format!("{}{}", module_path, $path_suffix);
439 for module in module_path.split("::") {
440 path.push(syn::PathSegment { ident: syn::Ident::new(module, Span::call_site()), arguments: syn::PathArguments::None });
442 } else if partial_path == "" && format!("{}", $ident) == "crate" {
443 new_path = format!("{}{}", crate_name, $path_suffix);
444 let crate_name_ident = format_ident!("{}", crate_name);
445 path.push(parse_quote!(#crate_name_ident));
446 } else if partial_path == "" && !dependencies.contains(&$ident) {
447 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
448 let crate_name_ident = format_ident!("{}", crate_name);
449 path.push(parse_quote!(#crate_name_ident));
450 } else if format!("{}", $ident) == "self" {
451 let mut path_iter = partial_path.rsplitn(2, "::");
452 path_iter.next().unwrap();
453 new_path = path_iter.next().unwrap().to_owned();
455 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
458 path.push(parse_quote!(#ident));
462 syn::UseTree::Path(p) => {
463 push_path!(p.ident, "::");
464 Self::process_use_intern(crate_name, module_path, dependencies, imports, &p.tree, &new_path, path);
466 syn::UseTree::Name(n) => {
467 push_path!(n.ident, "");
468 let imported_ident = syn::Ident::new(new_path.rsplitn(2, "::").next().unwrap(), Span::call_site());
469 imports.insert(imported_ident, (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
471 syn::UseTree::Group(g) => {
472 for i in g.items.iter() {
473 Self::process_use_intern(crate_name, module_path, dependencies, imports, i, partial_path, path.clone());
476 syn::UseTree::Rename(r) => {
477 push_path!(r.ident, "");
478 imports.insert(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
480 syn::UseTree::Glob(_) => {
481 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
486 fn process_use(crate_name: &str, module_path: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
487 if let syn::Visibility::Public(_) = u.vis {
488 // We actually only use these for #[cfg(fuzztarget)]
489 eprintln!("Ignoring pub(use) tree!");
492 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
493 Self::process_use_intern(crate_name, module_path, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
496 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
497 let ident = format_ident!("{}", id);
498 let path = parse_quote!(#ident);
499 imports.insert(ident, (id.to_owned(), path));
502 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 {
503 Self::from_borrowed_items(crate_name, dependencies, module_path, &contents.iter().map(|a| a).collect::<Vec<_>>())
505 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 {
506 let mut imports = HashMap::new();
507 // Add primitives to the "imports" list:
508 Self::insert_primitive(&mut imports, "bool");
509 Self::insert_primitive(&mut imports, "u64");
510 Self::insert_primitive(&mut imports, "u32");
511 Self::insert_primitive(&mut imports, "u16");
512 Self::insert_primitive(&mut imports, "u8");
513 Self::insert_primitive(&mut imports, "usize");
514 Self::insert_primitive(&mut imports, "str");
515 Self::insert_primitive(&mut imports, "String");
517 // These are here to allow us to print native Rust types in trait fn impls even if we don't
519 Self::insert_primitive(&mut imports, "Result");
520 Self::insert_primitive(&mut imports, "Vec");
521 Self::insert_primitive(&mut imports, "Option");
523 let mut declared = HashMap::new();
524 let mut priv_modules = HashSet::new();
526 for item in contents.iter() {
528 syn::Item::Use(u) => Self::process_use(crate_name, module_path, dependencies, &mut imports, &u),
529 syn::Item::Struct(s) => {
530 if let syn::Visibility::Public(_) = s.vis {
531 match export_status(&s.attrs) {
532 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported { generics: &s.generics }); },
533 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
534 ExportStatus::TestOnly => continue,
535 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
539 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
540 if let syn::Visibility::Public(_) = t.vis {
541 declared.insert(t.ident.clone(), DeclType::StructImported { generics: &t.generics });
544 syn::Item::Enum(e) => {
545 if let syn::Visibility::Public(_) = e.vis {
546 match export_status(&e.attrs) {
547 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored { generics: &e.generics }); },
548 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
549 ExportStatus::NotImplementable => panic!("(C-not implementable) should only appear on traits!"),
554 syn::Item::Trait(t) => {
555 match export_status(&t.attrs) {
556 ExportStatus::Export|ExportStatus::NotImplementable => {
557 if let syn::Visibility::Public(_) = t.vis {
558 declared.insert(t.ident.clone(), DeclType::Trait(t));
564 syn::Item::Mod(m) => {
565 priv_modules.insert(m.ident.clone());
571 Self { crate_name, dependencies, module_path, imports, declared, priv_modules }
574 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
575 self.declared.get(id)
578 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
579 if let Some((imp, _)) = self.imports.get(id) {
581 } else if self.declared.get(id).is_some() {
582 Some(self.module_path.to_string() + "::" + &format!("{}", id))
586 pub fn maybe_resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
587 if let Some(gen_types) = generics {
588 if let Some(resp) = gen_types.maybe_resolve_path(p) {
589 return Some(resp.clone());
593 if p.leading_colon.is_some() {
594 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
595 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
597 let firstseg = p.segments.iter().next().unwrap();
598 if !self.dependencies.contains(&firstseg.ident) {
599 res = self.crate_name.to_owned() + "::" + &res;
602 } else if let Some(id) = p.get_ident() {
603 self.maybe_resolve_ident(id)
605 if p.segments.len() == 1 {
606 let seg = p.segments.iter().next().unwrap();
607 return self.maybe_resolve_ident(&seg.ident);
609 let mut seg_iter = p.segments.iter();
610 let first_seg = seg_iter.next().unwrap();
611 let remaining: String = seg_iter.map(|seg| {
612 format!("::{}", seg.ident)
614 let first_seg_str = format!("{}", first_seg.ident);
615 if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
617 Some(imp.clone() + &remaining)
621 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
622 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
623 } else if first_seg_is_stdlib(&first_seg_str) || self.dependencies.contains(&first_seg.ident) {
624 Some(first_seg_str + &remaining)
629 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
630 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
632 syn::Type::Path(p) => {
633 if p.path.segments.len() != 1 { unimplemented!(); }
634 let mut args = p.path.segments[0].arguments.clone();
635 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
636 for arg in generics.args.iter_mut() {
637 if let syn::GenericArgument::Type(ref mut t) = arg {
638 *t = self.resolve_imported_refs(t.clone());
642 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
643 p.path = newpath.clone();
645 p.path.segments[0].arguments = args;
647 syn::Type::Reference(r) => {
648 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
650 syn::Type::Slice(s) => {
651 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
653 syn::Type::Tuple(t) => {
654 for e in t.elems.iter_mut() {
655 *e = self.resolve_imported_refs(e.clone());
658 _ => unimplemented!(),
664 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
665 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
666 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
667 // accomplish the same goals, so we just ignore it.
669 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
672 pub struct ASTModule {
673 pub attrs: Vec<syn::Attribute>,
674 pub items: Vec<syn::Item>,
675 pub submods: Vec<String>,
677 /// A struct containing the syn::File AST for each file in the crate.
678 pub struct FullLibraryAST {
679 pub modules: HashMap<String, ASTModule, NonRandomHash>,
680 pub dependencies: HashSet<syn::Ident>,
682 impl FullLibraryAST {
683 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
684 let mut non_mod_items = Vec::with_capacity(items.len());
685 let mut submods = Vec::with_capacity(items.len());
686 for item in items.drain(..) {
688 syn::Item::Mod(m) if m.content.is_some() => {
689 if export_status(&m.attrs) == ExportStatus::Export {
690 if let syn::Visibility::Public(_) = m.vis {
691 let modident = format!("{}", m.ident);
692 let modname = if module != "" {
693 module.clone() + "::" + &modident
697 self.load_module(modname, m.attrs, m.content.unwrap().1);
698 submods.push(modident);
700 non_mod_items.push(syn::Item::Mod(m));
704 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
705 syn::Item::ExternCrate(c) => {
706 if export_status(&c.attrs) == ExportStatus::Export {
707 self.dependencies.insert(c.ident);
710 _ => { non_mod_items.push(item); }
713 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
716 pub fn load_lib(lib: syn::File) -> Self {
717 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
718 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
719 res.load_module("".to_owned(), lib.attrs, lib.items);
724 /// List of manually-generated types which are clonable
725 fn initial_clonable_types() -> HashSet<String> {
726 let mut res = HashSet::new();
727 res.insert("crate::c_types::u5".to_owned());
728 res.insert("crate::c_types::FourBytes".to_owned());
729 res.insert("crate::c_types::TwelveBytes".to_owned());
730 res.insert("crate::c_types::SixteenBytes".to_owned());
731 res.insert("crate::c_types::TwentyBytes".to_owned());
732 res.insert("crate::c_types::ThirtyTwoBytes".to_owned());
733 res.insert("crate::c_types::SecretKey".to_owned());
734 res.insert("crate::c_types::PublicKey".to_owned());
735 res.insert("crate::c_types::Transaction".to_owned());
736 res.insert("crate::c_types::TxOut".to_owned());
737 res.insert("crate::c_types::Signature".to_owned());
738 res.insert("crate::c_types::RecoverableSignature".to_owned());
739 res.insert("crate::c_types::Bech32Error".to_owned());
740 res.insert("crate::c_types::Secp256k1Error".to_owned());
741 res.insert("crate::c_types::IOError".to_owned());
742 res.insert("crate::c_types::Error".to_owned());
743 res.insert("crate::c_types::Str".to_owned());
745 // Because some types are manually-mapped to CVec_u8Z we may end up checking if its clonable
746 // before we ever get to constructing the type fully via
747 // `write_c_mangled_container_path_intern` (which will add it here too), so we have to manually
748 // add it on startup.
749 res.insert("crate::c_types::derived::CVec_u8Z".to_owned());
753 /// Top-level struct tracking everything which has been defined while walking the crate.
754 pub struct CrateTypes<'a> {
755 /// This may contain structs or enums, but only when either is mapped as
756 /// struct X { inner: *mut originalX, .. }
757 pub opaques: HashMap<String, (&'a syn::Ident, &'a syn::Generics)>,
758 /// structs that weren't exposed
759 pub priv_structs: HashMap<String, &'a syn::Generics>,
760 /// Enums which are mapped as C enums with conversion functions
761 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
762 /// Traits which are mapped as a pointer + jump table
763 pub traits: HashMap<String, &'a syn::ItemTrait>,
764 /// Aliases from paths to some other Type
765 pub type_aliases: HashMap<String, syn::Type>,
766 /// Value is an alias to Key (maybe with some generics)
767 pub reverse_alias_map: HashMap<String, Vec<(String, syn::PathArguments)>>,
768 /// Template continer types defined, map from mangled type name -> whether a destructor fn
771 /// This is used at the end of processing to make C++ wrapper classes
772 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
773 /// The output file for any created template container types, written to as we find new
774 /// template containers which need to be defined.
775 template_file: RefCell<&'a mut File>,
776 /// Set of containers which are clonable
777 clonable_types: RefCell<HashSet<String>>,
779 pub trait_impls: HashMap<String, Vec<String>>,
780 /// The full set of modules in the crate(s)
781 pub lib_ast: &'a FullLibraryAST,
784 impl<'a> CrateTypes<'a> {
785 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
787 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
788 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
789 templates_defined: RefCell::new(HashMap::default()), priv_structs: HashMap::new(),
790 clonable_types: RefCell::new(initial_clonable_types()), trait_impls: HashMap::new(),
791 template_file: RefCell::new(template_file), lib_ast: &libast,
794 pub fn set_clonable(&self, object: String) {
795 self.clonable_types.borrow_mut().insert(object);
797 pub fn is_clonable(&self, object: &str) -> bool {
798 self.clonable_types.borrow().contains(object)
800 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
801 self.template_file.borrow_mut().write(created_container).unwrap();
802 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
806 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
807 /// module but contains a reference to the overall CrateTypes tracking.
808 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
809 pub module_path: &'mod_lifetime str,
810 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
811 pub types: ImportResolver<'mod_lifetime, 'crate_lft>,
814 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
815 /// happen to get the inner value of a generic.
816 enum EmptyValExpectedTy {
817 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
819 /// A Option mapped as a COption_*Z
821 /// A pointer which we want to convert to a reference.
826 /// Describes the appropriate place to print a general type-conversion string when converting a
828 enum ContainerPrefixLocation {
829 /// Prints a general type-conversion string prefix and suffix outside of the
830 /// container-conversion strings.
832 /// Prints a general type-conversion string prefix and suffix inside of the
833 /// container-conversion strings.
835 /// Does not print the usual type-conversion string prefix and suffix.
839 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
840 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
841 Self { module_path, types, crate_types }
844 // *************************************************
845 // *** Well know type and conversion definitions ***
846 // *************************************************
848 /// Returns true we if can just skip passing this to C entirely
849 pub fn skip_path(&self, full_path: &str) -> bool {
850 full_path == "bitcoin::secp256k1::Secp256k1" ||
851 full_path == "bitcoin::secp256k1::Signing" ||
852 full_path == "bitcoin::secp256k1::Verification"
854 /// Returns true we if can just skip passing this to C entirely
855 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
856 if full_path == "bitcoin::secp256k1::Secp256k1" {
857 "secp256k1::global::SECP256K1"
858 } else { unimplemented!(); }
861 /// Returns true if the object is a primitive and is mapped as-is with no conversion
863 pub fn is_primitive(&self, full_path: &str) -> bool {
874 pub fn is_clonable(&self, ty: &str) -> bool {
875 if self.crate_types.is_clonable(ty) { return true; }
876 if self.is_primitive(ty) { return true; }
882 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
883 /// ignored by for some reason need mapping anyway.
884 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
885 if self.is_primitive(full_path) {
886 return Some(full_path);
889 // Note that no !is_ref types can map to an array because Rust and C's call semantics
890 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
892 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
893 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes"),
894 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
895 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes"),
896 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
897 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
899 "str" if is_ref => Some("crate::c_types::Str"),
900 "alloc::string::String"|"String" => Some("crate::c_types::Str"),
902 "std::time::Duration"|"core::time::Duration" => Some("u64"),
903 "std::time::SystemTime" => Some("u64"),
904 "std::io::Error"|"lightning::io::Error" => Some("crate::c_types::IOError"),
905 "core::fmt::Arguments" if is_ref => Some("crate::c_types::Str"),
907 "core::convert::Infallible" => Some("crate::c_types::NotConstructable"),
909 "bitcoin::bech32::Error"|"bech32::Error"
910 if !is_ref => Some("crate::c_types::Bech32Error"),
911 "bitcoin::secp256k1::Error"|"secp256k1::Error"
912 if !is_ref => Some("crate::c_types::Secp256k1Error"),
914 "core::num::ParseIntError" => Some("crate::c_types::Error"),
915 "core::str::Utf8Error" => Some("crate::c_types::Error"),
917 "bitcoin::bech32::u5"|"bech32::u5" => Some("crate::c_types::u5"),
918 "core::num::NonZeroU8" => Some("u8"),
920 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some("crate::c_types::PublicKey"),
921 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature"),
922 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature"),
923 "bitcoin::secp256k1::SecretKey" if is_ref => Some("*const [u8; 32]"),
924 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey"),
925 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
926 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
927 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
928 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction"),
929 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
930 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
931 "bitcoin::util::address::WitnessVersion" => Some("crate::c_types::WitnessVersion"),
932 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
933 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
935 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|"bitcoin::hash_types::ScriptHash"
936 if is_ref => Some("*const [u8; 20]"),
937 "bitcoin::hash_types::WScriptHash"
938 if is_ref => Some("*const [u8; 32]"),
940 // Newtypes that we just expose in their original form.
941 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
942 if is_ref => Some("*const [u8; 32]"),
943 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
944 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
945 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
946 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
947 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
948 if is_ref => Some("*const [u8; 32]"),
949 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
950 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
951 if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
953 "lightning::io::Read" => Some("crate::c_types::u8slice"),
959 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
962 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
963 if self.is_primitive(full_path) {
964 return Some("".to_owned());
967 "Vec" if !is_ref => Some("local_"),
968 "Result" if !is_ref => Some("local_"),
969 "Option" if is_ref => Some("&local_"),
970 "Option" => Some("local_"),
972 "[u8; 32]" if is_ref => Some("unsafe { &*"),
973 "[u8; 32]" if !is_ref => Some(""),
974 "[u8; 20]" if !is_ref => Some(""),
975 "[u8; 16]" if !is_ref => Some(""),
976 "[u8; 12]" if !is_ref => Some(""),
977 "[u8; 4]" if !is_ref => Some(""),
978 "[u8; 3]" if !is_ref => Some(""),
980 "[u8]" if is_ref => Some(""),
981 "[usize]" if is_ref => Some(""),
983 "str" if is_ref => Some(""),
984 "alloc::string::String"|"String" => Some(""),
985 "std::io::Error"|"lightning::io::Error" => Some(""),
986 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
987 // cannot create a &String.
989 "core::convert::Infallible" => Some("panic!(\"You must never construct a NotConstructable! : "),
991 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(""),
992 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(""),
994 "core::num::ParseIntError" => Some("u8::from_str_radix(\" a\", 10).unwrap_err() /*"),
995 "core::str::Utf8Error" => Some("core::str::from_utf8(&[0xff]).unwrap_err() /*"),
997 "std::time::Duration"|"core::time::Duration" => Some("core::time::Duration::from_secs("),
998 "std::time::SystemTime" => Some("(::std::time::SystemTime::UNIX_EPOCH + std::time::Duration::from_secs("),
1000 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1001 "core::num::NonZeroU8" => Some("core::num::NonZeroU8::new("),
1003 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" if is_ref => Some("&"),
1004 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(""),
1005 "bitcoin::secp256k1::ecdsa::Signature" if is_ref => Some("&"),
1006 "bitcoin::secp256k1::ecdsa::Signature" => Some(""),
1007 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(""),
1008 "bitcoin::secp256k1::SecretKey" if is_ref => Some("&::bitcoin::secp256k1::SecretKey::from_slice(&unsafe { *"),
1009 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(""),
1010 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
1011 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
1012 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("&"),
1013 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(""),
1014 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::C_to_bitcoin_outpoint("),
1015 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
1016 "bitcoin::network::constants::Network" => Some(""),
1017 "bitcoin::util::address::WitnessVersion" => Some(""),
1018 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
1019 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
1021 "bitcoin::hash_types::PubkeyHash" if is_ref =>
1022 Some("&bitcoin::hash_types::PubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1023 "bitcoin::hash_types::WPubkeyHash" if is_ref =>
1024 Some("&bitcoin::hash_types::WPubkeyHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1025 "bitcoin::hash_types::ScriptHash" if is_ref =>
1026 Some("&bitcoin::hash_types::ScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1027 "bitcoin::hash_types::WScriptHash" if is_ref =>
1028 Some("&bitcoin::hash_types::WScriptHash::from_hash(bitcoin::hashes::Hash::from_inner(unsafe { *"),
1030 // Newtypes that we just expose in their original form.
1031 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
1032 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
1033 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
1034 "lightning::ln::PaymentHash" if !is_ref => Some("::lightning::ln::PaymentHash("),
1035 "lightning::ln::PaymentHash" if is_ref => Some("&::lightning::ln::PaymentHash(unsafe { *"),
1036 "lightning::ln::PaymentPreimage" if !is_ref => Some("::lightning::ln::PaymentPreimage("),
1037 "lightning::ln::PaymentPreimage" if is_ref => Some("&::lightning::ln::PaymentPreimage(unsafe { *"),
1038 "lightning::ln::PaymentSecret" if !is_ref => Some("::lightning::ln::PaymentSecret("),
1039 "lightning::ln::channelmanager::PaymentId" if !is_ref => Some("::lightning::ln::channelmanager::PaymentId("),
1040 "lightning::ln::channelmanager::PaymentId" if is_ref=> Some("&::lightning::ln::channelmanager::PaymentId( unsafe { *"),
1041 "lightning::chain::keysinterface::KeyMaterial" if !is_ref => Some("::lightning::chain::keysinterface::KeyMaterial("),
1042 "lightning::chain::keysinterface::KeyMaterial" if is_ref=> Some("&::lightning::chain::keysinterface::KeyMaterial( unsafe { *"),
1044 // List of traits we map (possibly during processing of other files):
1045 "lightning::io::Read" => Some("&mut "),
1048 }.map(|s| s.to_owned())
1050 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
1051 if self.is_primitive(full_path) {
1052 return Some("".to_owned());
1055 "Vec" if !is_ref => Some(""),
1056 "Option" => Some(""),
1057 "Result" if !is_ref => Some(""),
1059 "[u8; 32]" if is_ref => Some("}"),
1060 "[u8; 32]" if !is_ref => Some(".data"),
1061 "[u8; 20]" if !is_ref => Some(".data"),
1062 "[u8; 16]" if !is_ref => Some(".data"),
1063 "[u8; 12]" if !is_ref => Some(".data"),
1064 "[u8; 4]" if !is_ref => Some(".data"),
1065 "[u8; 3]" if !is_ref => Some(".data"),
1067 "[u8]" if is_ref => Some(".to_slice()"),
1068 "[usize]" if is_ref => Some(".to_slice()"),
1070 "str" if is_ref => Some(".into_str()"),
1071 "alloc::string::String"|"String" => Some(".into_string()"),
1072 "std::io::Error"|"lightning::io::Error" => Some(".to_rust()"),
1074 "core::convert::Infallible" => Some("\")"),
1076 "bitcoin::bech32::Error"|"bech32::Error" if !is_ref => Some(".into_rust()"),
1077 "bitcoin::secp256k1::Error"|"secp256k1::Error" if !is_ref => Some(".into_rust()"),
1079 "core::num::ParseIntError" => Some("*/"),
1080 "core::str::Utf8Error" => Some("*/"),
1082 "std::time::Duration"|"core::time::Duration" => Some(")"),
1083 "std::time::SystemTime" => Some("))"),
1085 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1086 "core::num::NonZeroU8" => Some(").expect(\"Value must be non-zero\")"),
1088 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(".into_rust()"),
1089 "bitcoin::secp256k1::ecdsa::Signature" => Some(".into_rust()"),
1090 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(".into_rust()"),
1091 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(".into_rust()"),
1092 "bitcoin::secp256k1::SecretKey" if is_ref => Some("}[..]).unwrap()"),
1093 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
1094 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
1095 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(".into_bitcoin()"),
1096 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1097 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
1098 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
1099 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1100 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
1101 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
1103 "bitcoin::hash_types::PubkeyHash"|"bitcoin::hash_types::WPubkeyHash"|
1104 "bitcoin::hash_types::ScriptHash"|"bitcoin::hash_types::WScriptHash"
1105 if is_ref => Some(" }.clone()))"),
1107 // Newtypes that we just expose in their original form.
1108 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
1109 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
1110 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
1111 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1112 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1113 if !is_ref => Some(".data)"),
1114 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1115 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1116 if is_ref => Some(" })"),
1118 // List of traits we map (possibly during processing of other files):
1119 "lightning::io::Read" => Some(".to_reader()"),
1122 }.map(|s| s.to_owned())
1125 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
1126 if self.is_primitive(full_path) {
1130 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
1131 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
1133 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
1134 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
1135 "bitcoin::hash_types::Txid" => None,
1138 }.map(|s| s.to_owned())
1140 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1141 if self.is_primitive(full_path) {
1142 return Some("".to_owned());
1145 "Result" if !is_ref => Some("local_"),
1146 "Vec" if !is_ref => Some("local_"),
1147 "Option" => Some("local_"),
1149 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1150 "[u8; 32]" if is_ref => Some(""),
1151 "[u8; 20]" if !is_ref => Some("crate::c_types::TwentyBytes { data: "),
1152 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
1153 "[u8; 12]" if !is_ref => Some("crate::c_types::TwelveBytes { data: "),
1154 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
1155 "[u8; 3]" if is_ref => Some(""),
1157 "[u8]" if is_ref => Some("local_"),
1158 "[usize]" if is_ref => Some("local_"),
1160 "str" if is_ref => Some(""),
1161 "alloc::string::String"|"String" => Some(""),
1163 "std::time::Duration"|"core::time::Duration" => Some(""),
1164 "std::time::SystemTime" => Some(""),
1165 "std::io::Error"|"lightning::io::Error" => Some("crate::c_types::IOError::from_rust("),
1166 "core::fmt::Arguments" => Some("alloc::format!(\"{}\", "),
1168 "core::convert::Infallible" => Some("panic!(\"Cannot construct an Infallible: "),
1170 "bitcoin::bech32::Error"|"bech32::Error"
1171 if !is_ref => Some("crate::c_types::Bech32Error::from_rust("),
1172 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1173 if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
1175 "core::num::ParseIntError" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1176 "core::str::Utf8Error" => Some("crate::c_types::Error { _dummy: 0 } /*"),
1178 "bitcoin::bech32::u5"|"bech32::u5" => Some(""),
1180 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some("crate::c_types::PublicKey::from_rust(&"),
1181 "bitcoin::secp256k1::ecdsa::Signature" => Some("crate::c_types::Signature::from_rust(&"),
1182 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some("crate::c_types::RecoverableSignature::from_rust(&"),
1183 "bitcoin::secp256k1::SecretKey" if is_ref => Some(""),
1184 "bitcoin::secp256k1::SecretKey" if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
1185 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
1186 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
1187 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" if is_ref => Some("crate::c_types::Transaction::from_bitcoin("),
1188 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some("crate::c_types::Transaction::from_bitcoin(&"),
1189 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
1190 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
1191 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1192 "bitcoin::util::address::WitnessVersion" => Some(""),
1193 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1194 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1196 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1198 // Newtypes that we just expose in their original form.
1199 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1200 if is_ref => Some(""),
1201 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1202 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1203 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1204 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1205 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1206 if is_ref => Some("&"),
1207 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1208 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1209 if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1211 "lightning::io::Read" => Some("crate::c_types::u8slice::from_vec(&crate::c_types::reader_to_vec("),
1214 }.map(|s| s.to_owned())
1216 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1217 if self.is_primitive(full_path) {
1218 return Some("".to_owned());
1221 "Result" if !is_ref => Some(""),
1222 "Vec" if !is_ref => Some(".into()"),
1223 "Option" => Some(""),
1225 "[u8; 32]" if !is_ref => Some(" }"),
1226 "[u8; 32]" if is_ref => Some(""),
1227 "[u8; 20]" if !is_ref => Some(" }"),
1228 "[u8; 16]" if !is_ref => Some(" }"),
1229 "[u8; 12]" if !is_ref => Some(" }"),
1230 "[u8; 4]" if !is_ref => Some(" }"),
1231 "[u8; 3]" if is_ref => Some(""),
1233 "[u8]" if is_ref => Some(""),
1234 "[usize]" if is_ref => Some(""),
1236 "str" if is_ref => Some(".into()"),
1237 "alloc::string::String"|"String" if is_ref => Some(".as_str().into()"),
1238 "alloc::string::String"|"String" => Some(".into()"),
1240 "std::time::Duration"|"core::time::Duration" => Some(".as_secs()"),
1241 "std::time::SystemTime" => Some(".duration_since(::std::time::SystemTime::UNIX_EPOCH).expect(\"Times must be post-1970\").as_secs()"),
1242 "std::io::Error"|"lightning::io::Error" => Some(")"),
1243 "core::fmt::Arguments" => Some(").into()"),
1245 "core::convert::Infallible" => Some("\")"),
1247 "bitcoin::secp256k1::Error"|"bech32::Error"
1248 if !is_ref => Some(")"),
1249 "bitcoin::secp256k1::Error"|"secp256k1::Error"
1250 if !is_ref => Some(")"),
1252 "core::num::ParseIntError" => Some("*/"),
1253 "core::str::Utf8Error" => Some("*/"),
1255 "bitcoin::bech32::u5"|"bech32::u5" => Some(".into()"),
1257 "bitcoin::secp256k1::PublicKey"|"secp256k1::PublicKey" => Some(")"),
1258 "bitcoin::secp256k1::ecdsa::Signature" => Some(")"),
1259 "bitcoin::secp256k1::ecdsa::RecoverableSignature" => Some(")"),
1260 "bitcoin::secp256k1::SecretKey" if !is_ref => Some(")"),
1261 "bitcoin::secp256k1::SecretKey" if is_ref => Some(".as_ref()"),
1262 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1263 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1264 "bitcoin::blockdata::transaction::Transaction"|"bitcoin::Transaction" => Some(")"),
1265 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1266 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1267 "bitcoin::network::constants::Network" => Some(")"),
1268 "bitcoin::util::address::WitnessVersion" => Some(".into()"),
1269 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1270 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1272 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1274 // Newtypes that we just expose in their original form.
1275 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1276 if is_ref => Some(".as_inner()"),
1277 "bitcoin::hash_types::Txid"|"bitcoin::hash_types::BlockHash"|"bitcoin_hashes::sha256::Hash"
1278 if !is_ref => Some(".into_inner() }"),
1279 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1280 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1281 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1282 if is_ref => Some(".0"),
1283 "lightning::ln::PaymentHash"|"lightning::ln::PaymentPreimage"|"lightning::ln::PaymentSecret"
1284 |"lightning::ln::channelmanager::PaymentId"|"lightning::chain::keysinterface::KeyMaterial"
1285 if !is_ref => Some(".0 }"),
1287 "lightning::io::Read" => Some("))"),
1290 }.map(|s| s.to_owned())
1293 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1295 "lightning::ln::PaymentSecret" => Some(".data == [0; 32]"),
1296 "secp256k1::PublicKey"|"bitcoin::secp256k1::PublicKey" => Some(".is_null()"),
1297 "bitcoin::secp256k1::ecdsa::Signature" => Some(".is_null()"),
1302 /// When printing a reference to the source crate's rust type, if we need to map it to a
1303 /// different "real" type, it can be done so here.
1304 /// This is useful to work around limitations in the binding type resolver, where we reference
1305 /// a non-public `use` alias.
1306 /// TODO: We should never need to use this!
1307 fn real_rust_type_mapping<'equiv>(&self, thing: &'equiv str) -> &'equiv str {
1309 "lightning::io::Read" => "crate::c_types::io::Read",
1314 // ****************************
1315 // *** Container Processing ***
1316 // ****************************
1318 /// Returns the module path in the generated mapping crate to the containers which we generate
1319 /// when writing to CrateTypes::template_file.
1320 pub fn generated_container_path() -> &'static str {
1321 "crate::c_types::derived"
1323 /// Returns the module path in the generated mapping crate to the container templates, which
1324 /// are then concretized and put in the generated container path/template_file.
1325 fn container_templ_path() -> &'static str {
1329 /// Returns true if the path containing the given args is a "transparent" container, ie an
1330 /// Option or a container which does not require a generated continer class.
1331 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 {
1332 if full_path == "Option" {
1333 let inner = args.next().unwrap();
1334 assert!(args.next().is_none());
1336 syn::Type::Reference(_) => true,
1337 syn::Type::Array(a) => {
1338 if let syn::Expr::Lit(l) = &a.len {
1339 if let syn::Lit::Int(i) = &l.lit {
1340 if i.base10_digits().parse::<usize>().unwrap() >= 32 {
1341 let mut buf = Vec::new();
1342 self.write_rust_type(&mut buf, generics, &a.elem);
1343 let ty = String::from_utf8(buf).unwrap();
1346 // Blindly assume that if we're trying to create an empty value for an
1347 // array < 32 entries that all-0s may be a valid state.
1350 } else { unimplemented!(); }
1351 } else { unimplemented!(); }
1353 syn::Type::Path(p) => {
1354 if let Some(resolved) = self.maybe_resolve_path(&p.path, generics) {
1355 if self.c_type_has_inner_from_path(&resolved) { return true; }
1356 if self.is_primitive(&resolved) { return false; }
1357 if self.c_type_from_path(&resolved, false, false).is_some() { true } else { false }
1360 syn::Type::Tuple(_) => false,
1361 _ => unimplemented!(),
1365 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1366 /// not require a generated continer class.
1367 pub fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1368 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1369 syn::PathArguments::None => return false,
1370 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1371 if let syn::GenericArgument::Type(ref ty) = arg {
1373 } else { unimplemented!() }
1375 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1377 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter, generics)
1379 /// Returns true if this is a known, supported, non-transparent container.
1380 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1381 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1383 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)
1384 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1385 // expecting one element in the vec per generic type, each of which is inline-converted
1386 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1388 "Result" if !is_ref => {
1390 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1391 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1392 ").into() }", ContainerPrefixLocation::PerConv))
1396 // We should only get here if the single contained has an inner
1397 assert!(self.c_type_has_inner(single_contained.unwrap()));
1399 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1402 if let Some(syn::Type::Reference(_)) = single_contained {
1403 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "(*item)".to_string())], "); }", ContainerPrefixLocation::PerConv))
1405 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1409 let mut is_contained_ref = false;
1410 let contained_struct = if let Some(syn::Type::Path(p)) = single_contained {
1411 Some(self.resolve_path(&p.path, generics))
1412 } else if let Some(syn::Type::Reference(r)) = single_contained {
1413 is_contained_ref = true;
1414 if let syn::Type::Path(p) = &*r.elem {
1415 Some(self.resolve_path(&p.path, generics))
1418 if let Some(inner_path) = contained_struct {
1419 let only_contained_has_inner = self.c_type_has_inner_from_path(&inner_path);
1420 if self.c_type_has_inner_from_path(&inner_path) {
1421 let is_inner_ref = if let Some(syn::Type::Reference(_)) = single_contained { true } else { false };
1423 return Some(("if ", vec![
1424 (".is_none() { core::ptr::null() } else { ObjOps::nonnull_ptr_to_inner(".to_owned(),
1425 format!("({}{}.unwrap())", var_access, if is_inner_ref { "" } else { ".as_ref()" }))
1426 ], ") }", ContainerPrefixLocation::OutsideConv));
1428 return Some(("if ", vec![
1429 (".is_none() { core::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1430 ], " }", ContainerPrefixLocation::OutsideConv));
1432 } else if self.is_primitive(&inner_path) || self.c_type_from_path(&inner_path, false, false).is_none() {
1433 if self.is_primitive(&inner_path) || (!is_contained_ref && !is_ref) || only_contained_has_inner {
1434 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1435 return Some(("if ", vec![
1436 (format!(".is_none() {{ {}::None }} else {{ {}::Some(", inner_name, inner_name),
1437 format!("{}.unwrap()", var_access))
1438 ], ") }", ContainerPrefixLocation::PerConv));
1440 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1441 return Some(("if ", vec![
1442 (format!(".is_none() {{ {}::None }} else {{ {}::Some(/* WARNING: CLONING CONVERSION HERE! &Option<Enum> is otherwise un-expressable. */", inner_name, inner_name),
1443 format!("{}.clone().unwrap()", var_access))
1444 ], ") }", ContainerPrefixLocation::PerConv));
1447 // If c_type_from_path is some (ie there's a manual mapping for the inner
1448 // type), lean on write_empty_rust_val, below.
1451 if let Some(t) = single_contained {
1452 if let syn::Type::Tuple(syn::TypeTuple { elems, .. }) = t {
1453 assert!(elems.is_empty());
1454 let inner_name = self.get_c_mangled_container_type(vec![single_contained.unwrap()], generics, "Option").unwrap();
1455 return Some(("if ", vec![
1456 (format!(".is_none() {{ {}::None }} else {{ {}::Some /*",
1457 inner_name, inner_name), format!(""))
1458 ], " */}", ContainerPrefixLocation::PerConv));
1460 if let syn::Type::Reference(syn::TypeReference { elem, .. }) = t {
1461 if let syn::Type::Slice(_) = &**elem {
1462 return Some(("if ", vec![
1463 (".is_none() { SmartPtr::null() } else { SmartPtr::from_obj(".to_string(),
1464 format!("({}.unwrap())", var_access))
1465 ], ") }", ContainerPrefixLocation::PerConv));
1468 let mut v = Vec::new();
1469 self.write_empty_rust_val(generics, &mut v, t);
1470 let s = String::from_utf8(v).unwrap();
1471 return Some(("if ", vec![
1472 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1473 ], " }", ContainerPrefixLocation::PerConv));
1474 } else { unreachable!(); }
1480 /// only_contained_has_inner implies that there is only one contained element in the container
1481 /// and it has an inner field (ie is an "opaque" type we've defined).
1482 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)
1483 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1484 // expecting one element in the vec per generic type, each of which is inline-converted
1485 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1486 let mut only_contained_has_inner = false;
1487 let only_contained_resolved = if let Some(syn::Type::Path(p)) = single_contained {
1488 let res = self.resolve_path(&p.path, generics);
1489 only_contained_has_inner = self.c_type_has_inner_from_path(&res);
1493 "Result" if !is_ref => {
1495 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1496 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1497 ")}", ContainerPrefixLocation::PerConv))
1499 "Slice" if is_ref && only_contained_has_inner => {
1500 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1503 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1506 if let Some(resolved) = only_contained_resolved {
1507 if self.is_primitive(&resolved) {
1508 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1509 } else if only_contained_has_inner {
1511 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1513 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1518 if let Some(t) = single_contained {
1520 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_)|syn::Type::Array(_) => {
1521 let mut v = Vec::new();
1522 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1523 let s = String::from_utf8(v).unwrap();
1525 EmptyValExpectedTy::ReferenceAsPointer =>
1526 return Some(("if ", vec![
1527 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1528 ], ") }", ContainerPrefixLocation::NoPrefix)),
1529 EmptyValExpectedTy::OptionType =>
1530 return Some(("{ /* ", vec![
1531 (format!("*/ let {}_opt = {};", var_name, var_access),
1532 format!("}} if {}_opt{} {{ None }} else {{ Some({{ {}_opt.take()", var_name, s, var_name))
1533 ], ") } }", ContainerPrefixLocation::PerConv)),
1534 EmptyValExpectedTy::NonPointer =>
1535 return Some(("if ", vec![
1536 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1537 ], ") }", ContainerPrefixLocation::PerConv)),
1540 syn::Type::Tuple(_) => {
1541 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1543 _ => unimplemented!(),
1545 } else { unreachable!(); }
1551 /// Constructs a reference to the given type, possibly tweaking the type if relevant to make it
1552 /// convertable to C.
1553 pub fn create_ownable_reference(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> Option<syn::Type> {
1554 let default_value = Some(syn::Type::Reference(syn::TypeReference {
1555 and_token: syn::Token!(&)(Span::call_site()), lifetime: None, mutability: None,
1556 elem: Box::new(t.clone()) }));
1557 match generics.resolve_type(t) {
1558 syn::Type::Path(p) => {
1559 if let Some(resolved_path) = self.maybe_resolve_path(&p.path, generics) {
1560 if resolved_path != "Vec" { return default_value; }
1561 if p.path.segments.len() != 1 { unimplemented!(); }
1562 let only_seg = p.path.segments.iter().next().unwrap();
1563 if let syn::PathArguments::AngleBracketed(args) = &only_seg.arguments {
1564 if args.args.len() != 1 { unimplemented!(); }
1565 let inner_arg = args.args.iter().next().unwrap();
1566 if let syn::GenericArgument::Type(ty) = &inner_arg {
1567 let mut can_create = self.c_type_has_inner(&ty);
1568 if let syn::Type::Path(inner) = ty {
1569 if inner.path.segments.len() == 1 &&
1570 format!("{}", inner.path.segments[0].ident) == "Vec" {
1574 if !can_create { return default_value; }
1575 if let Some(inner_ty) = self.create_ownable_reference(&ty, generics) {
1576 return Some(syn::Type::Reference(syn::TypeReference {
1577 and_token: syn::Token![&](Span::call_site()),
1580 elem: Box::new(syn::Type::Slice(syn::TypeSlice {
1581 bracket_token: syn::token::Bracket { span: Span::call_site() },
1582 elem: Box::new(inner_ty)
1585 } else { return default_value; }
1586 } else { unimplemented!(); }
1587 } else { unimplemented!(); }
1588 } else { return None; }
1594 // *************************************************
1595 // *** Type definition during main.rs processing ***
1596 // *************************************************
1598 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1599 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool {
1600 self.crate_types.opaques.get(full_path).is_some()
1603 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1604 pub fn c_type_has_inner(&self, ty: &syn::Type) -> bool {
1606 syn::Type::Path(p) => {
1607 if let Some(full_path) = self.maybe_resolve_path(&p.path, None) {
1608 self.c_type_has_inner_from_path(&full_path)
1611 syn::Type::Reference(r) => {
1612 self.c_type_has_inner(&*r.elem)
1618 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1619 self.types.maybe_resolve_ident(id)
1622 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1623 self.types.maybe_resolve_path(p_arg, generics)
1625 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1626 self.maybe_resolve_path(p, generics).unwrap()
1629 // ***********************************
1630 // *** Original Rust Type Printing ***
1631 // ***********************************
1633 fn in_rust_prelude(resolved_path: &str) -> bool {
1634 match resolved_path {
1642 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path) {
1643 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1644 if self.is_primitive(&resolved) {
1645 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1647 // TODO: We should have a generic "is from a dependency" check here instead of
1648 // checking for "bitcoin" explicitly.
1649 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1650 write!(w, "{}", resolved).unwrap();
1651 // If we're printing a generic argument, it needs to reference the crate, otherwise
1652 // the original crate:
1653 } else if self.maybe_resolve_path(&path, None).as_ref() == Some(&resolved) {
1654 write!(w, "{}", self.real_rust_type_mapping(&resolved)).unwrap();
1656 write!(w, "crate::{}", resolved).unwrap();
1659 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1660 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1663 if path.leading_colon.is_some() {
1664 write!(w, "::").unwrap();
1666 for (idx, seg) in path.segments.iter().enumerate() {
1667 if idx != 0 { write!(w, "::").unwrap(); }
1668 write!(w, "{}", seg.ident).unwrap();
1669 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1670 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1675 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>) {
1676 let mut had_params = false;
1677 for (idx, arg) in generics.enumerate() {
1678 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1681 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1682 syn::GenericParam::Type(t) => {
1683 write!(w, "{}", t.ident).unwrap();
1684 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1685 for (idx, bound) in t.bounds.iter().enumerate() {
1686 if idx != 0 { write!(w, " + ").unwrap(); }
1688 syn::TypeParamBound::Trait(tb) => {
1689 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1690 self.write_rust_path(w, generics_resolver, &tb.path);
1692 _ => unimplemented!(),
1695 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1697 _ => unimplemented!(),
1700 if had_params { write!(w, ">").unwrap(); }
1703 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>) {
1704 write!(w, "<").unwrap();
1705 for (idx, arg) in generics.enumerate() {
1706 if idx != 0 { write!(w, ", ").unwrap(); }
1708 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t),
1709 _ => unimplemented!(),
1712 write!(w, ">").unwrap();
1714 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
1715 match generics.resolve_type(t) {
1716 syn::Type::Path(p) => {
1717 if p.qself.is_some() {
1720 self.write_rust_path(w, generics, &p.path);
1722 syn::Type::Reference(r) => {
1723 write!(w, "&").unwrap();
1724 if let Some(lft) = &r.lifetime {
1725 write!(w, "'{} ", lft.ident).unwrap();
1727 if r.mutability.is_some() {
1728 write!(w, "mut ").unwrap();
1730 self.write_rust_type(w, generics, &*r.elem);
1732 syn::Type::Array(a) => {
1733 write!(w, "[").unwrap();
1734 self.write_rust_type(w, generics, &a.elem);
1735 if let syn::Expr::Lit(l) = &a.len {
1736 if let syn::Lit::Int(i) = &l.lit {
1737 write!(w, "; {}]", i).unwrap();
1738 } else { unimplemented!(); }
1739 } else { unimplemented!(); }
1741 syn::Type::Slice(s) => {
1742 write!(w, "[").unwrap();
1743 self.write_rust_type(w, generics, &s.elem);
1744 write!(w, "]").unwrap();
1746 syn::Type::Tuple(s) => {
1747 write!(w, "(").unwrap();
1748 for (idx, t) in s.elems.iter().enumerate() {
1749 if idx != 0 { write!(w, ", ").unwrap(); }
1750 self.write_rust_type(w, generics, &t);
1752 write!(w, ")").unwrap();
1754 _ => unimplemented!(),
1758 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1759 /// unint'd memory).
1760 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1762 syn::Type::Reference(r) => {
1763 self.write_empty_rust_val(generics, w, &*r.elem)
1765 syn::Type::Path(p) => {
1766 let resolved = self.resolve_path(&p.path, generics);
1767 if self.crate_types.opaques.get(&resolved).is_some() {
1768 write!(w, "crate::{} {{ inner: core::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1770 // Assume its a manually-mapped C type, where we can just define an null() fn
1771 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1774 syn::Type::Array(a) => {
1775 if let syn::Expr::Lit(l) = &a.len {
1776 if let syn::Lit::Int(i) = &l.lit {
1777 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1778 // Blindly assume that if we're trying to create an empty value for an
1779 // array < 32 entries that all-0s may be a valid state.
1782 let arrty = format!("[u8; {}]", i.base10_digits());
1783 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1784 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1785 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1786 } else { unimplemented!(); }
1787 } else { unimplemented!(); }
1789 _ => unimplemented!(),
1793 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1794 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1795 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1796 let mut split = real_ty.split("; ");
1797 split.next().unwrap();
1798 let tail_str = split.next().unwrap();
1799 assert!(split.next().is_none());
1800 let len = usize::from_str_radix(&tail_str[..tail_str.len() - 1], 10).unwrap();
1801 Some(parse_quote!([u8; #len]))
1806 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1807 /// See EmptyValExpectedTy for information on return types.
1808 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1810 syn::Type::Reference(r) => {
1811 return self.write_empty_rust_val_check_suffix(generics, w, &*r.elem);
1813 syn::Type::Path(p) => {
1814 let resolved = self.resolve_path(&p.path, generics);
1815 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1816 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1818 if self.crate_types.opaques.get(&resolved).is_some() {
1819 write!(w, ".inner.is_null()").unwrap();
1820 EmptyValExpectedTy::NonPointer
1822 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1823 write!(w, "{}", suffix).unwrap();
1824 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1825 EmptyValExpectedTy::NonPointer
1827 write!(w, ".is_none()").unwrap();
1828 EmptyValExpectedTy::OptionType
1832 syn::Type::Array(a) => {
1833 if let syn::Expr::Lit(l) = &a.len {
1834 if let syn::Lit::Int(i) = &l.lit {
1835 write!(w, ".data == [0; {}]", i.base10_digits()).unwrap();
1836 EmptyValExpectedTy::NonPointer
1837 } else { unimplemented!(); }
1838 } else { unimplemented!(); }
1840 syn::Type::Slice(_) => {
1841 // Option<[]> always implies that we want to treat len() == 0 differently from
1842 // None, so we always map an Option<[]> into a pointer.
1843 write!(w, " == core::ptr::null_mut()").unwrap();
1844 EmptyValExpectedTy::ReferenceAsPointer
1846 _ => unimplemented!(),
1850 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1851 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
1853 syn::Type::Reference(r) => {
1854 self.write_empty_rust_val_check(generics, w, &*r.elem, var_access);
1856 syn::Type::Path(_) => {
1857 write!(w, "{}", var_access).unwrap();
1858 self.write_empty_rust_val_check_suffix(generics, w, t);
1860 syn::Type::Array(a) => {
1861 if let syn::Expr::Lit(l) = &a.len {
1862 if let syn::Lit::Int(i) = &l.lit {
1863 let arrty = format!("[u8; {}]", i.base10_digits());
1864 // We don't (yet) support a new-var conversion here.
1865 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
1867 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
1869 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
1870 self.write_empty_rust_val_check_suffix(generics, w, t);
1871 } else { unimplemented!(); }
1872 } else { unimplemented!(); }
1874 _ => unimplemented!(),
1878 // ********************************
1879 // *** Type conversion printing ***
1880 // ********************************
1882 /// Returns true we if can just skip passing this to C entirely
1883 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
1885 syn::Type::Path(p) => {
1886 if p.qself.is_some() { unimplemented!(); }
1887 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1888 self.skip_path(&full_path)
1891 syn::Type::Reference(r) => {
1892 self.skip_arg(&*r.elem, generics)
1897 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1899 syn::Type::Path(p) => {
1900 if p.qself.is_some() { unimplemented!(); }
1901 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1902 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
1905 syn::Type::Reference(r) => {
1906 self.no_arg_to_rust(w, &*r.elem, generics);
1912 fn write_conversion_inline_intern<W: std::io::Write,
1913 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool, Option<&str>) -> String>
1914 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
1915 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
1916 match generics.resolve_type(t) {
1917 syn::Type::Reference(r) => {
1918 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
1919 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1921 syn::Type::Path(p) => {
1922 if p.qself.is_some() {
1926 let resolved_path = self.resolve_path(&p.path, generics);
1927 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1928 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1929 } else if self.is_primitive(&resolved_path) {
1930 if is_ref && prefix {
1931 write!(w, "*").unwrap();
1933 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
1934 write!(w, "{}", c_type).unwrap();
1935 } else if let Some((_, generics)) = self.crate_types.opaques.get(&resolved_path) {
1936 decl_lookup(w, &DeclType::StructImported { generics: &generics }, &resolved_path, is_ref, is_mut);
1937 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
1938 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
1939 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
1940 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
1941 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
1942 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
1943 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
1944 } else { unimplemented!(); }
1945 } else { unimplemented!(); }
1947 syn::Type::Array(a) => {
1948 // We assume all arrays contain only [int_literal; X]s.
1949 // This may result in some outputs not compiling.
1950 if let syn::Expr::Lit(l) = &a.len {
1951 if let syn::Lit::Int(i) = &l.lit {
1952 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
1953 } else { unimplemented!(); }
1954 } else { unimplemented!(); }
1956 syn::Type::Slice(s) => {
1957 // We assume all slices contain only literals or references.
1958 // This may result in some outputs not compiling.
1959 if let syn::Type::Path(p) = &*s.elem {
1960 let resolved = self.resolve_path(&p.path, generics);
1961 if self.is_primitive(&resolved) {
1962 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
1964 write!(w, "{}", sliceconv(true, None)).unwrap();
1966 } else if let syn::Type::Reference(r) = &*s.elem {
1967 if let syn::Type::Path(p) = &*r.elem {
1968 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)), None)).unwrap();
1969 } else if let syn::Type::Slice(_) = &*r.elem {
1970 write!(w, "{}", sliceconv(false, None)).unwrap();
1971 } else { unimplemented!(); }
1972 } else if let syn::Type::Tuple(t) = &*s.elem {
1973 assert!(!t.elems.is_empty());
1975 write!(w, "{}", sliceconv(false, None)).unwrap();
1977 let mut needs_map = false;
1978 for e in t.elems.iter() {
1979 if let syn::Type::Reference(_) = e {
1984 let mut map_str = Vec::new();
1985 write!(&mut map_str, ".map(|(").unwrap();
1986 for i in 0..t.elems.len() {
1987 write!(&mut map_str, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
1989 write!(&mut map_str, ")| (").unwrap();
1990 for (idx, e) in t.elems.iter().enumerate() {
1991 if let syn::Type::Reference(_) = e {
1992 write!(&mut map_str, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1993 } else if let syn::Type::Path(_) = e {
1994 write!(&mut map_str, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1995 } else { unimplemented!(); }
1997 write!(&mut map_str, "))").unwrap();
1998 write!(w, "{}", sliceconv(false, Some(&String::from_utf8(map_str).unwrap()))).unwrap();
2000 write!(w, "{}", sliceconv(false, None)).unwrap();
2003 } else { unimplemented!(); }
2005 syn::Type::Tuple(t) => {
2006 if t.elems.is_empty() {
2007 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
2008 // so work around it by just pretending its a 0u8
2009 write!(w, "{}", tupleconv).unwrap();
2011 if prefix { write!(w, "local_").unwrap(); }
2014 _ => unimplemented!(),
2018 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) {
2019 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "() /*", true, |_, _| "local_".to_owned(),
2020 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
2021 |w, decl_type, decl_path, is_ref, _is_mut| {
2023 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(", decl_path).unwrap(),
2024 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(", decl_path).unwrap(),
2025 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
2026 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref && from_ptr => {
2027 if !ptr_for_ref { write!(w, "&").unwrap(); }
2028 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap()
2030 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if is_ref => {
2031 if !ptr_for_ref { write!(w, "&").unwrap(); }
2032 write!(w, "crate::{} {{ inner: unsafe {{ ObjOps::nonnull_ptr_to_inner((", decl_path).unwrap()
2034 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2035 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
2036 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref =>
2037 write!(w, "crate::{} {{ inner: ObjOps::heap_alloc(", decl_path).unwrap(),
2038 DeclType::Trait(_) if is_ref => write!(w, "").unwrap(),
2039 DeclType::Trait(_) if !is_ref => write!(w, "Into::into(").unwrap(),
2040 _ => panic!("{:?}", decl_path),
2044 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) {
2045 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
2047 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) {
2048 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_, _| ".into()".to_owned(),
2049 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
2050 |w, decl_type, full_path, is_ref, _is_mut| match decl_type {
2051 DeclType::MirroredEnum => write!(w, ")").unwrap(),
2052 DeclType::EnumIgnored { generics }|DeclType::StructImported { generics } if is_ref => {
2053 write!(w, " as *const {}<", full_path).unwrap();
2054 for param in generics.params.iter() {
2055 if let syn::GenericParam::Lifetime(_) = param {
2056 write!(w, "'_, ").unwrap();
2058 write!(w, "_, ").unwrap();
2062 write!(w, ">) as *mut _ }}, is_owned: false }}").unwrap();
2064 write!(w, ">) as *mut _) }}, is_owned: false }}").unwrap();
2067 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref && from_ptr =>
2068 write!(w, ", is_owned: true }}").unwrap(),
2069 DeclType::EnumIgnored {..}|DeclType::StructImported {..} if !is_ref => write!(w, "), is_owned: true }}").unwrap(),
2070 DeclType::Trait(_) if is_ref => {},
2071 DeclType::Trait(_) => {
2072 // This is used when we're converting a concrete Rust type into a C trait
2073 // for use when a Rust trait method returns an associated type.
2074 // Because all of our C traits implement From<RustTypesImplementingTraits>
2075 // we can just call .into() here and be done.
2076 write!(w, ")").unwrap()
2078 _ => unimplemented!(),
2081 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) {
2082 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
2085 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) {
2086 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2087 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
2088 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2089 DeclType::StructImported {..} if is_ref => write!(w, "").unwrap(),
2090 DeclType::StructImported {..} if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
2091 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
2092 DeclType::MirroredEnum => {},
2093 DeclType::Trait(_) => {},
2094 _ => unimplemented!(),
2097 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2098 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
2100 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) {
2101 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
2102 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2103 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2104 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2105 (true, None) => "[..]".to_owned(),
2106 (true, Some(_)) => unreachable!(),
2108 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2109 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
2110 DeclType::StructImported {..} if is_ref && ptr_for_ref => write!(w, "XXX unimplemented").unwrap(),
2111 DeclType::StructImported {..} if is_mut && is_ref => write!(w, ".get_native_mut_ref()").unwrap(),
2112 DeclType::StructImported {..} if is_ref => write!(w, ".get_native_ref()").unwrap(),
2113 DeclType::StructImported {..} if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
2114 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
2115 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
2116 DeclType::Trait(_) => {},
2117 _ => unimplemented!(),
2120 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2121 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
2123 // Note that compared to the above conversion functions, the following two are generally
2124 // significantly undertested:
2125 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2126 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_, _| "&local_".to_owned(),
2128 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
2129 Some(format!("&{}", conv))
2132 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2133 DeclType::StructImported {..} if !is_ref => write!(w, "").unwrap(),
2134 _ => unimplemented!(),
2137 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
2138 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
2139 |has_inner, map_str_opt| match (has_inner, map_str_opt) {
2140 (false, Some(map_str)) => format!(".iter(){}.collect::<Vec<_>>()[..]", map_str),
2141 (false, None) => ".iter().collect::<Vec<_>>()[..]".to_owned(),
2142 (true, None) => "[..]".to_owned(),
2143 (true, Some(_)) => unreachable!(),
2145 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
2146 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
2147 DeclType::StructImported {..} if !is_ref => write!(w, ".get_native_ref()").unwrap(),
2148 _ => unimplemented!(),
2152 fn write_conversion_new_var_intern<'b, W: std::io::Write,
2153 LP: Fn(&str, bool) -> Option<(&str, &str)>,
2154 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
2155 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
2156 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
2157 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
2158 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool, from_ownable_ref: bool,
2159 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
2161 macro_rules! convert_container {
2162 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
2163 // For slices (and Options), we refuse to directly map them as is_ref when they
2164 // aren't opaque types containing an inner pointer. This is due to the fact that,
2165 // in both cases, the actual higher-level type is non-is_ref.
2166 let ty_has_inner = if $args_len == 1 {
2167 let ty = $args_iter().next().unwrap();
2168 if $container_type == "Slice" && to_c {
2169 // "To C ptr_for_ref" means "return the regular object with is_owned
2170 // set to false", which is totally what we want in a slice if we're about to
2171 // set ty_has_inner.
2174 if let syn::Type::Reference(t) = ty {
2175 if let syn::Type::Path(p) = &*t.elem {
2176 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2178 } else if let syn::Type::Path(p) = ty {
2179 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2183 // Options get a bunch of special handling, since in general we map Option<>al
2184 // types into the same C type as non-Option-wrapped types. This ends up being
2185 // pretty manual here and most of the below special-cases are for Options.
2186 let mut needs_ref_map = false;
2187 let mut only_contained_type = None;
2188 let mut only_contained_type_nonref = None;
2189 let mut only_contained_has_inner = false;
2190 let mut contains_slice = false;
2192 only_contained_has_inner = ty_has_inner;
2193 let arg = $args_iter().next().unwrap();
2194 if let syn::Type::Reference(t) = arg {
2195 only_contained_type = Some(arg);
2196 only_contained_type_nonref = Some(&*t.elem);
2197 if let syn::Type::Path(_) = &*t.elem {
2199 } else if let syn::Type::Slice(_) = &*t.elem {
2200 contains_slice = true;
2201 } else { return false; }
2202 // If the inner element contains an inner pointer, we will just use that,
2203 // avoiding the need to map elements to references. Otherwise we'll need to
2204 // do an extra mapping step.
2205 needs_ref_map = !only_contained_has_inner && $container_type == "Option";
2207 only_contained_type = Some(arg);
2208 only_contained_type_nonref = Some(arg);
2212 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref, only_contained_type, ident, var) {
2213 assert_eq!(conversions.len(), $args_len);
2214 write!(w, "let mut local_{}{} = ", ident,
2215 if (!to_c && needs_ref_map) || (to_c && $container_type == "Option" && contains_slice) {"_base"} else { "" }).unwrap();
2216 if prefix_location == ContainerPrefixLocation::OutsideConv {
2217 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2219 write!(w, "{}{}", prefix, var).unwrap();
2221 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
2222 let mut var = std::io::Cursor::new(Vec::new());
2223 write!(&mut var, "{}", var_name).unwrap();
2224 let var_access = String::from_utf8(var.into_inner()).unwrap();
2226 let conv_ty = if needs_ref_map { only_contained_type_nonref.as_ref().unwrap() } else { ty };
2228 write!(w, "{} {{ ", pfx).unwrap();
2229 let new_var_name = format!("{}_{}", ident, idx);
2230 let new_var = self.write_conversion_new_var_intern(w, &format_ident!("{}", new_var_name),
2231 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref,
2232 to_c, from_ownable_ref, path_lookup, container_lookup, var_prefix, var_suffix);
2233 if new_var { write!(w, " ").unwrap(); }
2235 if prefix_location == ContainerPrefixLocation::PerConv {
2236 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2237 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2238 write!(w, "ObjOps::heap_alloc(").unwrap();
2241 write!(w, "{}{}", if contains_slice && !to_c { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
2242 if prefix_location == ContainerPrefixLocation::PerConv {
2243 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2244 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
2245 write!(w, ")").unwrap();
2247 write!(w, " }}").unwrap();
2249 write!(w, "{}", suffix).unwrap();
2250 if prefix_location == ContainerPrefixLocation::OutsideConv {
2251 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
2253 write!(w, ";").unwrap();
2254 if !to_c && needs_ref_map {
2255 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
2257 write!(w, ".map(|a| &a[..])").unwrap();
2259 write!(w, ";").unwrap();
2260 } else if to_c && $container_type == "Option" && contains_slice {
2261 write!(w, " let mut local_{} = *local_{}_base;", ident, ident).unwrap();
2268 match generics.resolve_type(t) {
2269 syn::Type::Reference(r) => {
2270 if let syn::Type::Slice(_) = &*r.elem {
2271 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)
2273 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)
2276 syn::Type::Path(p) => {
2277 if p.qself.is_some() {
2280 let resolved_path = self.resolve_path(&p.path, generics);
2281 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
2282 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);
2284 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2285 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
2286 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
2287 if let syn::GenericArgument::Type(ty) = arg {
2288 generics.resolve_type(ty)
2289 } else { unimplemented!(); }
2291 } else { unimplemented!(); }
2293 if self.is_primitive(&resolved_path) {
2295 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
2296 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
2297 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2299 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
2304 syn::Type::Array(_) => {
2305 // We assume all arrays contain only primitive types.
2306 // This may result in some outputs not compiling.
2309 syn::Type::Slice(s) => {
2310 if let syn::Type::Path(p) = &*s.elem {
2311 let resolved = self.resolve_path(&p.path, generics);
2312 if self.is_primitive(&resolved) {
2313 let slice_path = format!("[{}]", resolved);
2314 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
2315 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
2319 let tyref = [&*s.elem];
2321 // If we're converting from a slice to a Vec, assume we can clone the
2322 // elements and clone them into a new Vec first. Next we'll walk the
2323 // new Vec here and convert them to C types.
2324 write!(w, "let mut local_{}_clone = Vec::new(); local_{}_clone.extend_from_slice({}); let mut {} = local_{}_clone; ", ident, ident, ident, ident, ident).unwrap();
2327 convert_container!("Vec", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2328 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2330 } else if let syn::Type::Reference(ty) = &*s.elem {
2331 let tyref = if from_ownable_ref || !to_c { [&*ty.elem] } else { [&*s.elem] };
2333 convert_container!("Slice", 1, || tyref.iter().map(|t| generics.resolve_type(*t)));
2334 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2335 } else if let syn::Type::Tuple(t) = &*s.elem {
2336 // When mapping into a temporary new var, we need to own all the underlying objects.
2337 // Thus, we drop any references inside the tuple and convert with non-reference types.
2338 let mut elems = syn::punctuated::Punctuated::new();
2339 for elem in t.elems.iter() {
2340 if let syn::Type::Reference(r) = elem {
2341 elems.push((*r.elem).clone());
2343 elems.push(elem.clone());
2346 let ty = [syn::Type::Tuple(syn::TypeTuple {
2347 paren_token: t.paren_token, elems
2351 convert_container!("Slice", 1, || ty.iter());
2352 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
2353 } else { unimplemented!() }
2355 syn::Type::Tuple(t) => {
2356 if !t.elems.is_empty() {
2357 // We don't (yet) support tuple elements which cannot be converted inline
2358 write!(w, "let (").unwrap();
2359 for idx in 0..t.elems.len() {
2360 if idx != 0 { write!(w, ", ").unwrap(); }
2361 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
2363 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
2364 // Like other template types, tuples are always mapped as their non-ref
2365 // versions for types which have different ref mappings. Thus, we convert to
2366 // non-ref versions and handle opaque types with inner pointers manually.
2367 for (idx, elem) in t.elems.iter().enumerate() {
2368 if let syn::Type::Path(p) = elem {
2369 let v_name = format!("orig_{}_{}", ident, idx);
2370 let tuple_elem_ident = format_ident!("{}", &v_name);
2371 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
2372 false, ptr_for_ref, to_c, from_ownable_ref,
2373 path_lookup, container_lookup, var_prefix, var_suffix) {
2374 write!(w, " ").unwrap();
2375 // Opaque types with inner pointers shouldn't ever create new stack
2376 // variables, so we don't handle it and just assert that it doesn't
2378 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
2382 write!(w, "let mut local_{} = (", ident).unwrap();
2383 for (idx, elem) in t.elems.iter().enumerate() {
2384 let real_elem = generics.resolve_type(&elem);
2385 let ty_has_inner = {
2387 // "To C ptr_for_ref" means "return the regular object with
2388 // is_owned set to false", which is totally what we want
2389 // if we're about to set ty_has_inner.
2392 if let syn::Type::Reference(t) = real_elem {
2393 if let syn::Type::Path(p) = &*t.elem {
2394 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2396 } else if let syn::Type::Path(p) = real_elem {
2397 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2400 if idx != 0 { write!(w, ", ").unwrap(); }
2401 var_prefix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2402 if is_ref && ty_has_inner {
2403 // For ty_has_inner, the regular var_prefix mapping will take a
2404 // reference, so deref once here to make sure we keep the original ref.
2405 write!(w, "*").unwrap();
2407 write!(w, "orig_{}_{}", ident, idx).unwrap();
2408 if is_ref && !ty_has_inner {
2409 // If we don't have an inner variable's reference to maintain, just
2410 // hope the type is Clonable and use that.
2411 write!(w, ".clone()").unwrap();
2413 var_suffix(w, real_elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2415 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2419 _ => unimplemented!(),
2423 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 {
2424 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, from_ownable_ref, ptr_for_ref, true, from_ownable_ref,
2425 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2426 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2427 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2428 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2429 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2431 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 {
2432 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref, false)
2434 /// Prints new-var conversion for an "ownable_ref" type, ie prints conversion for
2435 /// `create_ownable_reference(t)`, not `t` itself.
2436 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 {
2437 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, true, true)
2439 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 {
2440 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false, false,
2441 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2442 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2443 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2444 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2445 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2448 // ******************************************************
2449 // *** C Container Type Equivalent and alias Printing ***
2450 // ******************************************************
2452 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 {
2453 for (idx, t) in args.enumerate() {
2455 write!(w, ", ").unwrap();
2457 if let syn::Type::Reference(r_arg) = t {
2458 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2460 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false, true, true) { return false; }
2462 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2463 // reference to something stupid, so check that the container is either opaque or a
2464 // predefined type (currently only Transaction).
2465 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2466 let resolved = self.resolve_path(&p_arg.path, generics);
2467 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2468 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2469 } else { unimplemented!(); }
2470 } else if let syn::Type::Path(p_arg) = t {
2471 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2472 if !self.is_primitive(&resolved) {
2473 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2476 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2478 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2480 // We don't currently support outer reference types for non-primitive inners,
2481 // except for the empty tuple.
2482 if let syn::Type::Tuple(t_arg) = t {
2483 assert!(t_arg.elems.len() == 0 || !is_ref);
2487 if !self.write_c_type_intern(w, t, generics, false, false, false, true, true) { return false; }
2492 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2493 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2494 let mut created_container: Vec<u8> = Vec::new();
2496 if container_type == "Result" {
2497 let mut a_ty: Vec<u8> = Vec::new();
2498 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2499 if tup.elems.is_empty() {
2500 write!(&mut a_ty, "()").unwrap();
2502 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2505 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2508 let mut b_ty: Vec<u8> = Vec::new();
2509 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2510 if tup.elems.is_empty() {
2511 write!(&mut b_ty, "()").unwrap();
2513 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2516 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2519 let ok_str = String::from_utf8(a_ty).unwrap();
2520 let err_str = String::from_utf8(b_ty).unwrap();
2521 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2522 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2524 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2526 } else if container_type == "Vec" {
2527 let mut a_ty: Vec<u8> = Vec::new();
2528 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2529 let ty = String::from_utf8(a_ty).unwrap();
2530 let is_clonable = self.is_clonable(&ty);
2531 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2533 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2535 } else if container_type.ends_with("Tuple") {
2536 let mut tuple_args = Vec::new();
2537 let mut is_clonable = true;
2538 for arg in args.iter() {
2539 let mut ty: Vec<u8> = Vec::new();
2540 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2541 let ty_str = String::from_utf8(ty).unwrap();
2542 if !self.is_clonable(&ty_str) {
2543 is_clonable = false;
2545 tuple_args.push(ty_str);
2547 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2549 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2551 } else if container_type == "Option" {
2552 let mut a_ty: Vec<u8> = Vec::new();
2553 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2554 let ty = String::from_utf8(a_ty).unwrap();
2555 let is_clonable = self.is_clonable(&ty);
2556 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2558 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2563 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2567 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2568 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2569 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2570 } else { unimplemented!(); }
2572 fn write_c_mangled_container_path_intern<W: std::io::Write>
2573 (&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 {
2574 let mut mangled_type: Vec<u8> = Vec::new();
2575 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2576 write!(w, "C{}_", ident).unwrap();
2577 write!(mangled_type, "C{}_", ident).unwrap();
2578 } else { assert_eq!(args.len(), 1); }
2579 for arg in args.iter() {
2580 macro_rules! write_path {
2581 ($p_arg: expr, $extra_write: expr) => {
2582 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2583 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2585 if self.c_type_has_inner_from_path(&subtype) {
2586 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref, false, true) { return false; }
2588 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2589 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false, false, true) { return false; }
2591 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2592 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true, false, true) { return false; }
2596 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2598 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2599 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2600 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2603 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2604 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2605 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2606 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2607 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2610 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2611 write!(w, "{}", id).unwrap();
2612 write!(mangled_type, "{}", id).unwrap();
2613 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2614 write!(w2, "{}", id).unwrap();
2617 } else { return false; }
2620 match generics.resolve_type(arg) {
2621 syn::Type::Tuple(tuple) => {
2622 if tuple.elems.len() == 0 {
2623 write!(w, "None").unwrap();
2624 write!(mangled_type, "None").unwrap();
2626 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2628 // Figure out what the mangled type should look like. To disambiguate
2629 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2630 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2631 // available for use in type names.
2632 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2633 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2634 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2635 for elem in tuple.elems.iter() {
2636 if let syn::Type::Path(p) = elem {
2637 write_path!(p, Some(&mut mangled_tuple_type));
2638 } else if let syn::Type::Reference(refelem) = elem {
2639 if let syn::Type::Path(p) = &*refelem.elem {
2640 write_path!(p, Some(&mut mangled_tuple_type));
2641 } else { return false; }
2642 } else { return false; }
2644 write!(w, "Z").unwrap();
2645 write!(mangled_type, "Z").unwrap();
2646 write!(mangled_tuple_type, "Z").unwrap();
2647 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2648 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2653 syn::Type::Path(p_arg) => {
2654 write_path!(p_arg, None);
2656 syn::Type::Reference(refty) => {
2657 if let syn::Type::Path(p_arg) = &*refty.elem {
2658 write_path!(p_arg, None);
2659 } else if let syn::Type::Slice(_) = &*refty.elem {
2660 // write_c_type will actually do exactly what we want here, we just need to
2661 // make it a pointer so that its an option. Note that we cannot always convert
2662 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2663 // to edit it, hence we use *mut here instead of *const.
2664 if args.len() != 1 { return false; }
2665 write!(w, "*mut ").unwrap();
2666 self.write_c_type(w, arg, None, true);
2667 } else { return false; }
2669 syn::Type::Array(a) => {
2670 if let syn::Type::Path(p_arg) = &*a.elem {
2671 let resolved = self.resolve_path(&p_arg.path, generics);
2672 if !self.is_primitive(&resolved) { return false; }
2673 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2674 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2675 if in_type || args.len() != 1 {
2676 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2677 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2679 let arrty = format!("[{}; {}]", resolved, len.base10_digits());
2680 let realty = self.c_type_from_path(&arrty, is_ref, ptr_for_ref).unwrap_or(&arrty);
2681 write!(w, "{}", realty).unwrap();
2682 write!(mangled_type, "{}", realty).unwrap();
2684 } else { return false; }
2685 } else { return false; }
2687 _ => { return false; },
2690 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) { return true; }
2691 // Push the "end of type" Z
2692 write!(w, "Z").unwrap();
2693 write!(mangled_type, "Z").unwrap();
2695 // Make sure the type is actually defined:
2696 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2698 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 {
2699 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) {
2700 write!(w, "{}::", Self::generated_container_path()).unwrap();
2702 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2704 pub fn get_c_mangled_container_type(&self, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, template_name: &str) -> Option<String> {
2705 let mut out = Vec::new();
2706 if !self.write_c_mangled_container_path(&mut out, args, generics, template_name, false, false, false) {
2709 Some(String::from_utf8(out).unwrap())
2712 // **********************************
2713 // *** C Type Equivalent Printing ***
2714 // **********************************
2716 fn write_c_path_intern<W: std::io::Write>(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool, c_ty: bool) -> bool {
2717 let full_path = match self.maybe_resolve_path(&path, generics) {
2718 Some(path) => path, None => return false };
2719 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2720 write!(w, "{}", c_type).unwrap();
2722 } else if self.crate_types.traits.get(&full_path).is_some() {
2723 // Note that we always use the crate:: prefix here as we are always referring to a
2724 // concrete object which is of the generated type, it just implements the upstream
2726 if is_ref && ptr_for_ref {
2727 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2729 if with_ref_lifetime { unimplemented!(); }
2730 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2732 write!(w, "crate::{}", full_path).unwrap();
2735 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2736 let crate_pfx = if c_ty { "crate::" } else { "" };
2737 if is_ref && ptr_for_ref {
2738 // ptr_for_ref implies we're returning the object, which we can't really do for
2739 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2740 // the actual object itself (for opaque types we'll set the pointer to the actual
2741 // type and note that its a reference).
2742 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2743 } else if is_ref && with_ref_lifetime {
2745 // If we're concretizing something with a lifetime parameter, we have to pick a
2746 // lifetime, of which the only real available choice is `static`, obviously.
2747 write!(w, "&'static {}", crate_pfx).unwrap();
2749 self.write_rust_path(w, generics, path);
2751 // We shouldn't be mapping references in types, so panic here
2755 write!(w, "&{}{}{}", if is_mut { "mut " } else { "" }, crate_pfx, full_path).unwrap();
2757 write!(w, "{}{}", crate_pfx, full_path).unwrap();
2764 fn write_c_type_intern<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool, c_ty: bool) -> bool {
2765 match generics.resolve_type(t) {
2766 syn::Type::Path(p) => {
2767 if p.qself.is_some() {
2770 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2771 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2772 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);
2774 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2775 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty);
2778 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref, with_ref_lifetime, c_ty)
2780 syn::Type::Reference(r) => {
2781 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref, with_ref_lifetime, c_ty)
2783 syn::Type::Array(a) => {
2784 if is_ref && is_mut {
2785 write!(w, "*mut [").unwrap();
2786 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2788 write!(w, "*const [").unwrap();
2789 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2791 let mut typecheck = Vec::new();
2792 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime, c_ty) { return false; }
2793 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2795 if let syn::Expr::Lit(l) = &a.len {
2796 if let syn::Lit::Int(i) = &l.lit {
2798 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2799 write!(w, "{}", ty).unwrap();
2803 write!(w, "; {}]", i).unwrap();
2809 syn::Type::Slice(s) => {
2810 if !is_ref || is_mut { return false; }
2811 if let syn::Type::Path(p) = &*s.elem {
2812 let resolved = self.resolve_path(&p.path, generics);
2813 if self.is_primitive(&resolved) {
2814 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2817 let mut inner_c_ty = Vec::new();
2818 assert!(self.write_c_path_intern(&mut inner_c_ty, &p.path, generics, true, false, ptr_for_ref, with_ref_lifetime, c_ty));
2819 if self.is_clonable(&String::from_utf8(inner_c_ty).unwrap()) {
2820 if let Some(id) = p.path.get_ident() {
2821 let mangled_container = format!("CVec_{}Z", id);
2822 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2823 self.check_create_container(mangled_container, "Vec", vec![&*s.elem], generics, false)
2827 } else if let syn::Type::Reference(r) = &*s.elem {
2828 if let syn::Type::Path(p) = &*r.elem {
2829 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
2830 let resolved = self.resolve_path(&p.path, generics);
2831 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2832 format!("CVec_{}Z", ident)
2833 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
2834 format!("CVec_{}Z", en.ident)
2835 } else if let Some(id) = p.path.get_ident() {
2836 format!("CVec_{}Z", id)
2837 } else { return false; };
2838 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2839 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
2840 } else if let syn::Type::Slice(sl2) = &*r.elem {
2841 if let syn::Type::Reference(r2) = &*sl2.elem {
2842 if let syn::Type::Path(p) = &*r2.elem {
2843 // Slices with slices with opaque types (with is_owned flags) are mapped as non-ref Vecs
2844 let resolved = self.resolve_path(&p.path, generics);
2845 let mangled_container = if let Some((ident, _)) = self.crate_types.opaques.get(&resolved) {
2846 format!("CVec_CVec_{}ZZ", ident)
2847 } else { return false; };
2848 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2849 let inner = &r2.elem;
2850 let vec_ty: syn::Type = syn::parse_quote!(Vec<#inner>);
2851 self.check_create_container(mangled_container, "Vec", vec![&vec_ty], generics, false)
2855 } else if let syn::Type::Tuple(_) = &*s.elem {
2856 let mut args = syn::punctuated::Punctuated::<_, syn::token::Comma>::new();
2857 args.push(syn::GenericArgument::Type((*s.elem).clone()));
2858 let mut segments = syn::punctuated::Punctuated::new();
2859 segments.push(parse_quote!(Vec<#args>));
2860 self.write_c_type_intern(w, &syn::Type::Path(syn::TypePath { qself: None, path: syn::Path { leading_colon: None, segments } }), generics, false, is_mut, ptr_for_ref, with_ref_lifetime, c_ty)
2863 syn::Type::Tuple(t) => {
2864 if t.elems.len() == 0 {
2867 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
2868 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
2874 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2875 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, false, true));
2877 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) {
2878 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, true, false));
2880 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
2881 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false, false, true)
2883 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2884 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false, false, true)