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};
19 // The following utils are used purely to build our known types maps - they break down all the
20 // types we need to resolve to include the given object, and no more.
22 pub fn first_seg_self<'a>(t: &'a syn::Type) -> Option<impl Iterator<Item=&syn::PathSegment> + 'a> {
24 syn::Type::Path(p) => {
25 if p.qself.is_some() || p.path.leading_colon.is_some() {
28 let mut segs = p.path.segments.iter();
29 let ty = segs.next().unwrap();
30 if !ty.arguments.is_empty() { return None; }
31 if format!("{}", ty.ident) == "Self" {
39 pub fn get_single_remaining_path_seg<'a, I: Iterator<Item=&'a syn::PathSegment>>(segs: &mut I) -> Option<&'a syn::Ident> {
40 if let Some(ty) = segs.next() {
41 if !ty.arguments.is_empty() { unimplemented!(); }
42 if segs.next().is_some() { return None; }
47 pub fn single_ident_generic_path_to_ident(p: &syn::Path) -> Option<&syn::Ident> {
48 if p.segments.len() == 1 {
49 Some(&p.segments.iter().next().unwrap().ident)
53 pub fn path_matches_nongeneric(p: &syn::Path, exp: &[&str]) -> bool {
54 if p.segments.len() != exp.len() { return false; }
55 for (seg, e) in p.segments.iter().zip(exp.iter()) {
56 if seg.arguments != syn::PathArguments::None { return false; }
57 if &format!("{}", seg.ident) != *e { return false; }
62 #[derive(Debug, PartialEq)]
63 pub enum ExportStatus {
68 /// Gets the ExportStatus of an object (struct, fn, etc) given its attributes.
69 pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
70 for attr in attrs.iter() {
71 let tokens_clone = attr.tokens.clone();
72 let mut token_iter = tokens_clone.into_iter();
73 if let Some(token) = token_iter.next() {
75 TokenTree::Punct(c) if c.as_char() == '=' => {
76 // Really not sure where syn gets '=' from here -
77 // it somehow represents '///' or '//!'
79 TokenTree::Group(g) => {
80 if format!("{}", single_ident_generic_path_to_ident(&attr.path).unwrap()) == "cfg" {
81 let mut iter = g.stream().into_iter();
82 if let TokenTree::Ident(i) = iter.next().unwrap() {
84 // #[cfg(any(test, feature = ""))]
85 if let TokenTree::Group(g) = iter.next().unwrap() {
86 let mut all_test = true;
87 for token in g.stream().into_iter() {
88 if let TokenTree::Ident(i) = token {
89 match format!("{}", i).as_str() {
92 _ => all_test = false,
94 } else if let TokenTree::Literal(lit) = token {
95 if format!("{}", lit) != "fuzztarget" {
100 if all_test { return ExportStatus::TestOnly; }
102 } else if i == "test" || i == "feature" {
103 // If its cfg(feature(...)) we assume its test-only
104 return ExportStatus::TestOnly;
108 continue; // eg #[derive()]
110 _ => unimplemented!(),
113 match token_iter.next().unwrap() {
114 TokenTree::Literal(lit) => {
115 let line = format!("{}", lit);
116 if line.contains("(C-not exported)") {
117 return ExportStatus::NoExport;
120 _ => unimplemented!(),
126 pub fn assert_simple_bound(bound: &syn::TraitBound) {
127 if bound.paren_token.is_some() || bound.lifetimes.is_some() { unimplemented!(); }
128 if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
131 /// Returns true if the enum will be mapped as an opaue (ie struct with a pointer to the underlying
132 /// type), otherwise it is mapped into a transparent, C-compatible version of itself.
133 pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool {
134 for var in e.variants.iter() {
135 if let syn::Fields::Named(fields) = &var.fields {
136 for field in fields.named.iter() {
137 match export_status(&field.attrs) {
138 ExportStatus::Export|ExportStatus::TestOnly => {},
139 ExportStatus::NoExport => return true,
142 } else if let syn::Fields::Unnamed(fields) = &var.fields {
143 for field in fields.unnamed.iter() {
144 match export_status(&field.attrs) {
145 ExportStatus::Export|ExportStatus::TestOnly => {},
146 ExportStatus::NoExport => return true,
154 /// A stack of sets of generic resolutions.
156 /// This tracks the template parameters for a function, struct, or trait, allowing resolution into
157 /// a concrete type. By pushing a new context onto the stack, this can track a function's template
158 /// parameters inside of a generic struct or trait.
160 /// It maps both direct types as well as Deref<Target = X>, mapping them via the provided
161 /// TypeResolver's resolve_path function (ie traits map to the concrete jump table, structs to the
162 /// concrete C container struct, etc).
164 pub struct GenericTypes<'a, 'b> {
165 parent: Option<&'b GenericTypes<'b, 'b>>,
166 typed_generics: HashMap<&'a syn::Ident, (String, Option<&'a syn::Path>)>,
168 impl<'a, 'p: 'a> GenericTypes<'a, 'p> {
169 pub fn new() -> Self {
170 Self { parent: None, typed_generics: HashMap::new(), }
173 /// push a new context onto the stack, allowing for a new set of generics to be learned which
174 /// will override any lower contexts, but which will still fall back to resoltion via lower
176 pub fn push_ctx<'c>(&'c self) -> GenericTypes<'a, 'c> {
177 GenericTypes { parent: Some(self), typed_generics: HashMap::new(), }
180 /// Learn the generics in generics in the current context, given a TypeResolver.
181 pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool {
182 // First learn simple generics...
183 for generic in generics.params.iter() {
185 syn::GenericParam::Type(type_param) => {
186 let mut non_lifetimes_processed = false;
187 for bound in type_param.bounds.iter() {
188 if let syn::TypeParamBound::Trait(trait_bound) = bound {
189 if let Some(ident) = single_ident_generic_path_to_ident(&trait_bound.path) {
190 match &format!("{}", ident) as &str { "Send" => continue, "Sync" => continue, _ => {} }
192 if path_matches_nongeneric(&trait_bound.path, &["core", "clone", "Clone"]) { continue; }
194 assert_simple_bound(&trait_bound);
195 if let Some(mut path) = types.maybe_resolve_path(&trait_bound.path, None) {
196 if types.skip_path(&path) { continue; }
197 if path == "Sized" { continue; }
198 if non_lifetimes_processed { return false; }
199 non_lifetimes_processed = true;
200 let new_ident = if path != "std::ops::Deref" {
201 path = "crate::".to_string() + &path;
202 Some(&trait_bound.path)
204 self.typed_generics.insert(&type_param.ident, (path, new_ident));
205 } else { return false; }
212 // Then find generics where we are required to pass a Deref<Target=X> and pretend its just X.
213 if let Some(wh) = &generics.where_clause {
214 for pred in wh.predicates.iter() {
215 if let syn::WherePredicate::Type(t) = pred {
216 if let syn::Type::Path(p) = &t.bounded_ty {
217 if p.qself.is_some() { return false; }
218 if p.path.leading_colon.is_some() { return false; }
219 let mut p_iter = p.path.segments.iter();
220 if let Some(gen) = self.typed_generics.get_mut(&p_iter.next().unwrap().ident) {
221 if gen.0 != "std::ops::Deref" { return false; }
222 if &format!("{}", p_iter.next().unwrap().ident) != "Target" { return false; }
224 let mut non_lifetimes_processed = false;
225 for bound in t.bounds.iter() {
226 if let syn::TypeParamBound::Trait(trait_bound) = bound {
227 if let Some(id) = trait_bound.path.get_ident() {
228 if format!("{}", id) == "Sized" { continue; }
230 if non_lifetimes_processed { return false; }
231 non_lifetimes_processed = true;
232 assert_simple_bound(&trait_bound);
233 *gen = ("crate::".to_string() + &types.resolve_path(&trait_bound.path, None),
234 Some(&trait_bound.path));
237 } else { return false; }
238 } else { return false; }
242 for (_, (_, ident)) in self.typed_generics.iter() {
243 if ident.is_none() { return false; }
248 /// Learn the associated types from the trait in the current context.
249 pub fn learn_associated_types<'b, 'c>(&mut self, t: &'a syn::ItemTrait, types: &'b TypeResolver<'a, 'c>) {
250 for item in t.items.iter() {
252 &syn::TraitItem::Type(ref t) => {
253 if t.default.is_some() || t.generics.lt_token.is_some() { unimplemented!(); }
254 let mut bounds_iter = t.bounds.iter();
255 match bounds_iter.next().unwrap() {
256 syn::TypeParamBound::Trait(tr) => {
257 assert_simple_bound(&tr);
258 if let Some(mut path) = types.maybe_resolve_path(&tr.path, None) {
259 if types.skip_path(&path) { continue; }
260 // In general we handle Deref<Target=X> as if it were just X (and
261 // implement Deref<Target=Self> for relevant types). We don't
262 // bother to implement it for associated types, however, so we just
263 // ignore such bounds.
264 let new_ident = if path != "std::ops::Deref" {
265 path = "crate::".to_string() + &path;
268 self.typed_generics.insert(&t.ident, (path, new_ident));
269 } else { unimplemented!(); }
271 _ => unimplemented!(),
273 if bounds_iter.next().is_some() { unimplemented!(); }
280 /// Attempt to resolve an Ident as a generic parameter and return the full path.
281 pub fn maybe_resolve_ident<'b>(&'b self, ident: &syn::Ident) -> Option<&'b String> {
282 if let Some(res) = self.typed_generics.get(ident).map(|(a, _)| a) {
285 if let Some(parent) = self.parent {
286 parent.maybe_resolve_ident(ident)
291 /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string
293 pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<(&'b String, &'a syn::Path)> {
294 if let Some(ident) = path.get_ident() {
295 if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) {
299 // Associated types are usually specified as "Self::Generic", so we check for that
301 let mut it = path.segments.iter();
302 if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" {
303 let ident = &it.next().unwrap().ident;
304 if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) {
309 if let Some(parent) = self.parent {
310 parent.maybe_resolve_path(path)
317 #[derive(Clone, PartialEq)]
318 // The type of declaration and the object itself
319 pub enum DeclType<'a> {
321 Trait(&'a syn::ItemTrait),
327 pub struct ImportResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
328 crate_name: &'mod_lifetime str,
329 dependencies: &'mod_lifetime HashSet<syn::Ident>,
330 module_path: &'mod_lifetime str,
331 imports: HashMap<syn::Ident, (String, syn::Path)>,
332 declared: HashMap<syn::Ident, DeclType<'crate_lft>>,
333 priv_modules: HashSet<syn::Ident>,
335 impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'crate_lft> {
336 fn process_use_intern(crate_name: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>,
337 u: &syn::UseTree, partial_path: &str, mut path: syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>) {
340 macro_rules! push_path {
341 ($ident: expr, $path_suffix: expr) => {
342 if partial_path == "" && !dependencies.contains(&$ident) {
343 new_path = format!("{}::{}{}", crate_name, $ident, $path_suffix);
344 path.push(syn::PathSegment { ident: syn::Ident::new(crate_name, Span::call_site()), arguments: syn::PathArguments::None });
346 new_path = format!("{}{}{}", partial_path, $ident, $path_suffix);
348 path.push(syn::PathSegment { ident: $ident.clone(), arguments: syn::PathArguments::None });
352 syn::UseTree::Path(p) => {
353 push_path!(p.ident, "::");
354 Self::process_use_intern(crate_name, dependencies, imports, &p.tree, &new_path, path);
356 syn::UseTree::Name(n) => {
357 push_path!(n.ident, "");
358 imports.insert(n.ident.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
360 syn::UseTree::Group(g) => {
361 for i in g.items.iter() {
362 Self::process_use_intern(crate_name, dependencies, imports, i, partial_path, path.clone());
365 syn::UseTree::Rename(r) => {
366 push_path!(r.ident, "");
367 imports.insert(r.rename.clone(), (new_path, syn::Path { leading_colon: Some(syn::Token![::](Span::call_site())), segments: path }));
369 syn::UseTree::Glob(_) => {
370 eprintln!("Ignoring * use for {} - this may result in resolution failures", partial_path);
375 fn process_use(crate_name: &str, dependencies: &HashSet<syn::Ident>, imports: &mut HashMap<syn::Ident, (String, syn::Path)>, u: &syn::ItemUse) {
376 if let syn::Visibility::Public(_) = u.vis {
377 // We actually only use these for #[cfg(fuzztarget)]
378 eprintln!("Ignoring pub(use) tree!");
381 if u.leading_colon.is_some() { eprintln!("Ignoring leading-colon use!"); return; }
382 Self::process_use_intern(crate_name, dependencies, imports, &u.tree, "", syn::punctuated::Punctuated::new());
385 fn insert_primitive(imports: &mut HashMap<syn::Ident, (String, syn::Path)>, id: &str) {
386 let ident = syn::Ident::new(id, Span::call_site());
387 let mut path = syn::punctuated::Punctuated::new();
388 path.push(syn::PathSegment { ident: ident.clone(), arguments: syn::PathArguments::None });
389 imports.insert(ident, (id.to_owned(), syn::Path { leading_colon: None, segments: path }));
392 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 {
393 let mut imports = HashMap::new();
394 // Add primitives to the "imports" list:
395 Self::insert_primitive(&mut imports, "bool");
396 Self::insert_primitive(&mut imports, "u64");
397 Self::insert_primitive(&mut imports, "u32");
398 Self::insert_primitive(&mut imports, "u16");
399 Self::insert_primitive(&mut imports, "u8");
400 Self::insert_primitive(&mut imports, "usize");
401 Self::insert_primitive(&mut imports, "str");
402 Self::insert_primitive(&mut imports, "String");
404 // These are here to allow us to print native Rust types in trait fn impls even if we don't
406 Self::insert_primitive(&mut imports, "Result");
407 Self::insert_primitive(&mut imports, "Vec");
408 Self::insert_primitive(&mut imports, "Option");
410 let mut declared = HashMap::new();
411 let mut priv_modules = HashSet::new();
413 for item in contents.iter() {
415 syn::Item::Use(u) => Self::process_use(crate_name, dependencies, &mut imports, &u),
416 syn::Item::Struct(s) => {
417 if let syn::Visibility::Public(_) = s.vis {
418 match export_status(&s.attrs) {
419 ExportStatus::Export => { declared.insert(s.ident.clone(), DeclType::StructImported); },
420 ExportStatus::NoExport => { declared.insert(s.ident.clone(), DeclType::StructIgnored); },
421 ExportStatus::TestOnly => continue,
425 syn::Item::Type(t) if export_status(&t.attrs) == ExportStatus::Export => {
426 if let syn::Visibility::Public(_) = t.vis {
427 let mut process_alias = true;
428 for tok in t.generics.params.iter() {
429 if let syn::GenericParam::Lifetime(_) = tok {}
430 else { process_alias = false; }
433 declared.insert(t.ident.clone(), DeclType::StructImported);
437 syn::Item::Enum(e) => {
438 if let syn::Visibility::Public(_) = e.vis {
439 match export_status(&e.attrs) {
440 ExportStatus::Export if is_enum_opaque(e) => { declared.insert(e.ident.clone(), DeclType::EnumIgnored); },
441 ExportStatus::Export => { declared.insert(e.ident.clone(), DeclType::MirroredEnum); },
446 syn::Item::Trait(t) if export_status(&t.attrs) == ExportStatus::Export => {
447 if let syn::Visibility::Public(_) = t.vis {
448 declared.insert(t.ident.clone(), DeclType::Trait(t));
451 syn::Item::Mod(m) => {
452 priv_modules.insert(m.ident.clone());
458 Self { crate_name, dependencies, module_path, imports, declared, priv_modules }
461 pub fn get_declared_type(&self, ident: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
462 self.declared.get(ident)
465 pub fn maybe_resolve_declared(&self, id: &syn::Ident) -> Option<&DeclType<'crate_lft>> {
466 self.declared.get(id)
469 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
470 if let Some((imp, _)) = self.imports.get(id) {
472 } else if self.declared.get(id).is_some() {
473 Some(self.module_path.to_string() + "::" + &format!("{}", id))
477 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
478 if let Some((imp, _)) = self.imports.get(id) {
480 } else if let Some(decl_type) = self.declared.get(id) {
482 DeclType::StructIgnored => None,
483 _ => Some(self.module_path.to_string() + "::" + &format!("{}", id)),
488 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
489 let p = if let Some(gen_types) = generics {
490 if let Some((_, synpath)) = gen_types.maybe_resolve_path(p_arg) {
495 if p.leading_colon.is_some() {
496 let mut res: String = p.segments.iter().enumerate().map(|(idx, seg)| {
497 format!("{}{}", if idx == 0 { "" } else { "::" }, seg.ident)
499 let firstseg = p.segments.iter().next().unwrap();
500 if !self.dependencies.contains(&firstseg.ident) {
501 res = self.crate_name.to_owned() + "::" + &res;
504 } else if let Some(id) = p.get_ident() {
505 self.maybe_resolve_ident(id)
507 if p.segments.len() == 1 {
508 let seg = p.segments.iter().next().unwrap();
509 return self.maybe_resolve_ident(&seg.ident);
511 let mut seg_iter = p.segments.iter();
512 let first_seg = seg_iter.next().unwrap();
513 let remaining: String = seg_iter.map(|seg| {
514 format!("::{}", seg.ident)
516 let first_seg_str = format!("{}", first_seg.ident);
517 if first_seg_str == "std" {
518 Some(first_seg_str + &remaining)
519 } else if let Some((imp, _)) = self.imports.get(&first_seg.ident) {
521 Some(imp.clone() + &remaining)
525 } else if let Some(_) = self.priv_modules.get(&first_seg.ident) {
526 Some(format!("{}::{}{}", self.module_path, first_seg.ident, remaining))
531 /// Map all the Paths in a Type into absolute paths given a set of imports (generated via process_use_intern)
532 pub fn resolve_imported_refs(&self, mut ty: syn::Type) -> syn::Type {
534 syn::Type::Path(p) => {
535 eprintln!("rir {:?}", p);
536 if p.path.segments.len() != 1 { unimplemented!(); }
537 let mut args = p.path.segments[0].arguments.clone();
538 if let syn::PathArguments::AngleBracketed(ref mut generics) = &mut args {
539 for arg in generics.args.iter_mut() {
540 if let syn::GenericArgument::Type(ref mut t) = arg {
541 *t = self.resolve_imported_refs(t.clone());
545 if let Some((_, newpath)) = self.imports.get(single_ident_generic_path_to_ident(&p.path).unwrap()) {
546 p.path = newpath.clone();
548 p.path.segments[0].arguments = args;
550 syn::Type::Reference(r) => {
551 r.elem = Box::new(self.resolve_imported_refs((*r.elem).clone()));
553 syn::Type::Slice(s) => {
554 s.elem = Box::new(self.resolve_imported_refs((*s.elem).clone()));
556 syn::Type::Tuple(t) => {
557 for e in t.elems.iter_mut() {
558 *e = self.resolve_imported_refs(e.clone());
561 _ => unimplemented!(),
567 // templates_defined is walked to write the C++ header, so if we use the default hashing it get
568 // reordered on each genbindings run. Instead, we use SipHasher (which defaults to 0-keys) so that
569 // the sorting is stable across runs. It is deprecated, but the "replacement" doesn't actually
570 // accomplish the same goals, so we just ignore it.
572 pub type NonRandomHash = hash::BuildHasherDefault<hash::SipHasher>;
575 pub struct ASTModule {
576 pub attrs: Vec<syn::Attribute>,
577 pub items: Vec<syn::Item>,
578 pub submods: Vec<String>,
580 /// A struct containing the syn::File AST for each file in the crate.
581 pub struct FullLibraryAST {
582 pub modules: HashMap<String, ASTModule, NonRandomHash>,
583 pub dependencies: HashSet<syn::Ident>,
585 impl FullLibraryAST {
586 fn load_module(&mut self, module: String, attrs: Vec<syn::Attribute>, mut items: Vec<syn::Item>) {
587 let mut non_mod_items = Vec::with_capacity(items.len());
588 let mut submods = Vec::with_capacity(items.len());
589 for item in items.drain(..) {
591 syn::Item::Mod(m) if m.content.is_some() => {
592 if export_status(&m.attrs) == ExportStatus::Export {
593 if let syn::Visibility::Public(_) = m.vis {
594 let modident = format!("{}", m.ident);
595 let modname = if module != "" {
596 module.clone() + "::" + &modident
600 self.load_module(modname, m.attrs, m.content.unwrap().1);
601 submods.push(modident);
603 non_mod_items.push(syn::Item::Mod(m));
607 syn::Item::Mod(_) => panic!("--pretty=expanded output should never have non-body modules"),
608 syn::Item::ExternCrate(c) => {
609 if export_status(&c.attrs) == ExportStatus::Export {
610 self.dependencies.insert(c.ident);
613 _ => { non_mod_items.push(item); }
616 self.modules.insert(module, ASTModule { attrs, items: non_mod_items, submods });
619 pub fn load_lib(lib: syn::File) -> Self {
620 assert_eq!(export_status(&lib.attrs), ExportStatus::Export);
621 let mut res = Self { modules: HashMap::default(), dependencies: HashSet::new() };
622 res.load_module("".to_owned(), lib.attrs, lib.items);
627 /// Top-level struct tracking everything which has been defined while walking the crate.
628 pub struct CrateTypes<'a> {
629 /// This may contain structs or enums, but only when either is mapped as
630 /// struct X { inner: *mut originalX, .. }
631 pub opaques: HashMap<String, &'a syn::Ident>,
632 /// Enums which are mapped as C enums with conversion functions
633 pub mirrored_enums: HashMap<String, &'a syn::ItemEnum>,
634 /// Traits which are mapped as a pointer + jump table
635 pub traits: HashMap<String, &'a syn::ItemTrait>,
636 /// Aliases from paths to some other Type
637 pub type_aliases: HashMap<String, syn::Type>,
638 /// Value is an alias to Key (maybe with some generics)
639 pub reverse_alias_map: HashMap<String, Vec<(syn::Path, syn::PathArguments)>>,
640 /// Template continer types defined, map from mangled type name -> whether a destructor fn
643 /// This is used at the end of processing to make C++ wrapper classes
644 pub templates_defined: RefCell<HashMap<String, bool, NonRandomHash>>,
645 /// The output file for any created template container types, written to as we find new
646 /// template containers which need to be defined.
647 template_file: RefCell<&'a mut File>,
648 /// Set of containers which are clonable
649 clonable_types: RefCell<HashSet<String>>,
651 pub trait_impls: HashMap<String, Vec<String>>,
652 /// The full set of modules in the crate(s)
653 pub lib_ast: &'a FullLibraryAST,
656 impl<'a> CrateTypes<'a> {
657 pub fn new(template_file: &'a mut File, libast: &'a FullLibraryAST) -> Self {
659 opaques: HashMap::new(), mirrored_enums: HashMap::new(), traits: HashMap::new(),
660 type_aliases: HashMap::new(), reverse_alias_map: HashMap::new(),
661 templates_defined: RefCell::new(HashMap::default()),
662 clonable_types: RefCell::new(HashSet::new()), trait_impls: HashMap::new(),
663 template_file: RefCell::new(template_file), lib_ast: &libast,
666 pub fn set_clonable(&self, object: String) {
667 self.clonable_types.borrow_mut().insert(object);
669 pub fn is_clonable(&self, object: &str) -> bool {
670 self.clonable_types.borrow().contains(object)
672 pub fn write_new_template(&self, mangled_container: String, has_destructor: bool, created_container: &[u8]) {
673 self.template_file.borrow_mut().write(created_container).unwrap();
674 self.templates_defined.borrow_mut().insert(mangled_container, has_destructor);
678 /// A struct which tracks resolving rust types into C-mapped equivalents, exists for one specific
679 /// module but contains a reference to the overall CrateTypes tracking.
680 pub struct TypeResolver<'mod_lifetime, 'crate_lft: 'mod_lifetime> {
681 pub module_path: &'mod_lifetime str,
682 pub crate_types: &'mod_lifetime CrateTypes<'crate_lft>,
683 types: ImportResolver<'mod_lifetime, 'crate_lft>,
686 /// Returned by write_empty_rust_val_check_suffix to indicate what type of dereferencing needs to
687 /// happen to get the inner value of a generic.
688 enum EmptyValExpectedTy {
689 /// A type which has a flag for being empty (eg an array where we treat all-0s as empty).
691 /// A pointer that we want to dereference and move out of.
693 /// A pointer which we want to convert to a reference.
698 /// Describes the appropriate place to print a general type-conversion string when converting a
700 enum ContainerPrefixLocation {
701 /// Prints a general type-conversion string prefix and suffix outside of the
702 /// container-conversion strings.
704 /// Prints a general type-conversion string prefix and suffix inside of the
705 /// container-conversion strings.
707 /// Does not print the usual type-conversion string prefix and suffix.
711 impl<'a, 'c: 'a> TypeResolver<'a, 'c> {
712 pub fn new(module_path: &'a str, types: ImportResolver<'a, 'c>, crate_types: &'a CrateTypes<'c>) -> Self {
713 Self { module_path, types, crate_types }
716 // *************************************************
717 // *** Well know type and conversion definitions ***
718 // *************************************************
720 /// Returns true we if can just skip passing this to C entirely
721 fn skip_path(&self, full_path: &str) -> bool {
722 full_path == "bitcoin::secp256k1::Secp256k1" ||
723 full_path == "bitcoin::secp256k1::Signing" ||
724 full_path == "bitcoin::secp256k1::Verification"
726 /// Returns true we if can just skip passing this to C entirely
727 fn no_arg_path_to_rust(&self, full_path: &str) -> &str {
728 if full_path == "bitcoin::secp256k1::Secp256k1" {
729 "secp256k1::SECP256K1"
730 } else { unimplemented!(); }
733 /// Returns true if the object is a primitive and is mapped as-is with no conversion
735 pub fn is_primitive(&self, full_path: &str) -> bool {
746 pub fn is_clonable(&self, ty: &str) -> bool {
747 if self.crate_types.is_clonable(ty) { return true; }
748 if self.is_primitive(ty) { return true; }
751 "crate::c_types::Signature" => true,
752 "crate::c_types::TxOut" => true,
756 /// Gets the C-mapped type for types which are outside of the crate, or which are manually
757 /// ignored by for some reason need mapping anyway.
758 fn c_type_from_path<'b>(&self, full_path: &'b str, is_ref: bool, _ptr_for_ref: bool) -> Option<&'b str> {
759 if self.is_primitive(full_path) {
760 return Some(full_path);
763 "Result" => Some("crate::c_types::derived::CResult"),
764 "Vec" if !is_ref => Some("crate::c_types::derived::CVec"),
765 "Option" => Some(""),
767 // Note that no !is_ref types can map to an array because Rust and C's call semantics
768 // for arrays are different (https://github.com/eqrion/cbindgen/issues/528)
770 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
771 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes"),
772 "[u8; 10]" if !is_ref => Some("crate::c_types::TenBytes"),
773 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes"),
774 "[u8; 3]" if !is_ref => Some("crate::c_types::ThreeBytes"), // Used for RGB values
776 "str" if is_ref => Some("crate::c_types::Str"),
777 "String" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
778 "String" if is_ref => Some("crate::c_types::Str"),
780 "std::time::Duration" => Some("u64"),
781 "std::io::Error" => Some("crate::c_types::IOError"),
783 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
784 => Some("crate::c_types::PublicKey"),
785 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature"),
786 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
787 if is_ref => Some("*const [u8; 32]"),
788 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
789 if !is_ref => Some("crate::c_types::SecretKey"),
790 "bitcoin::secp256k1::Error" if !is_ref => Some("crate::c_types::Secp256k1Error"),
791 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice"),
792 "bitcoin::blockdata::script::Script" if !is_ref => Some("crate::c_types::derived::CVec_u8Z"),
793 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::lightning::chain::transaction::OutPoint"),
794 "bitcoin::blockdata::transaction::Transaction" => Some("crate::c_types::Transaction"),
795 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut"),
796 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network"),
797 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("*const [u8; 80]"),
798 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice"),
800 // Newtypes that we just expose in their original form.
801 "bitcoin::hash_types::Txid" if is_ref => Some("*const [u8; 32]"),
802 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
803 "bitcoin::hash_types::BlockHash" if is_ref => Some("*const [u8; 32]"),
804 "bitcoin::hash_types::BlockHash" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
805 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
806 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("*const [u8; 32]"),
807 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
808 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("*const [u8; 32]"),
809 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
810 "lightning::ln::channelmanager::PaymentSecret" if is_ref => Some("crate::c_types::ThirtyTwoBytes"),
811 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes"),
813 // Override the default since Records contain an fmt with a lifetime:
814 "lightning::util::logger::Record" => Some("*const std::os::raw::c_char"),
820 fn from_c_conversion_new_var_from_path<'b>(&self, _full_path: &str, _is_ref: bool) -> Option<(&'b str, &'b str)> {
823 fn from_c_conversion_prefix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
824 if self.is_primitive(full_path) {
825 return Some("".to_owned());
828 "Vec" if !is_ref => Some("local_"),
829 "Result" if !is_ref => Some("local_"),
830 "Option" if is_ref => Some("&local_"),
831 "Option" => Some("local_"),
833 "[u8; 32]" if is_ref => Some("unsafe { &*"),
834 "[u8; 32]" if !is_ref => Some(""),
835 "[u8; 16]" if !is_ref => Some(""),
836 "[u8; 10]" if !is_ref => Some(""),
837 "[u8; 4]" if !is_ref => Some(""),
838 "[u8; 3]" if !is_ref => Some(""),
840 "[u8]" if is_ref => Some(""),
841 "[usize]" if is_ref => Some(""),
843 "str" if is_ref => Some(""),
844 "String" if !is_ref => Some("String::from_utf8("),
845 // Note that we'll panic for String if is_ref, as we only have non-owned memory, we
846 // cannot create a &String.
848 "std::time::Duration" => Some("std::time::Duration::from_secs("),
850 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
851 if is_ref => Some("&"),
852 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
854 "bitcoin::secp256k1::Signature" if is_ref => Some("&"),
855 "bitcoin::secp256k1::Signature" => Some(""),
856 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
857 if is_ref => Some("&::bitcoin::secp256k1::key::SecretKey::from_slice(&unsafe { *"),
858 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
859 if !is_ref => Some(""),
860 "bitcoin::blockdata::script::Script" if is_ref => Some("&::bitcoin::blockdata::script::Script::from(Vec::from("),
861 "bitcoin::blockdata::script::Script" if !is_ref => Some("::bitcoin::blockdata::script::Script::from("),
862 "bitcoin::blockdata::transaction::Transaction" if is_ref => Some("&"),
863 "bitcoin::blockdata::transaction::Transaction" => Some(""),
864 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(""),
865 "bitcoin::network::constants::Network" => Some(""),
866 "bitcoin::blockdata::block::BlockHeader" => Some("&::bitcoin::consensus::encode::deserialize(unsafe { &*"),
867 "bitcoin::blockdata::block::Block" if is_ref => Some("&::bitcoin::consensus::encode::deserialize("),
869 // Newtypes that we just expose in their original form.
870 "bitcoin::hash_types::Txid" if is_ref => Some("&::bitcoin::hash_types::Txid::from_slice(&unsafe { &*"),
871 "bitcoin::hash_types::Txid" if !is_ref => Some("::bitcoin::hash_types::Txid::from_slice(&"),
872 "bitcoin::hash_types::BlockHash" => Some("::bitcoin::hash_types::BlockHash::from_slice(&"),
873 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("::lightning::ln::channelmanager::PaymentHash("),
874 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("&::lightning::ln::channelmanager::PaymentHash(unsafe { *"),
875 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some("::lightning::ln::channelmanager::PaymentPreimage("),
876 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("&::lightning::ln::channelmanager::PaymentPreimage(unsafe { *"),
877 "lightning::ln::channelmanager::PaymentSecret" => Some("::lightning::ln::channelmanager::PaymentSecret("),
879 // List of traits we map (possibly during processing of other files):
880 "crate::util::logger::Logger" => Some(""),
883 }.map(|s| s.to_owned())
885 fn from_c_conversion_suffix_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<String> {
886 if self.is_primitive(full_path) {
887 return Some("".to_owned());
890 "Vec" if !is_ref => Some(""),
891 "Option" => Some(""),
892 "Result" if !is_ref => Some(""),
894 "[u8; 32]" if is_ref => Some("}"),
895 "[u8; 32]" if !is_ref => Some(".data"),
896 "[u8; 16]" if !is_ref => Some(".data"),
897 "[u8; 10]" if !is_ref => Some(".data"),
898 "[u8; 4]" if !is_ref => Some(".data"),
899 "[u8; 3]" if !is_ref => Some(".data"),
901 "[u8]" if is_ref => Some(".to_slice()"),
902 "[usize]" if is_ref => Some(".to_slice()"),
904 "str" if is_ref => Some(".into()"),
905 "String" if !is_ref => Some(".into_rust()).unwrap()"),
907 "std::time::Duration" => Some(")"),
909 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
910 => Some(".into_rust()"),
911 "bitcoin::secp256k1::Signature" => Some(".into_rust()"),
912 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
913 if !is_ref => Some(".into_rust()"),
914 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
915 if is_ref => Some("}[..]).unwrap()"),
916 "bitcoin::blockdata::script::Script" if is_ref => Some(".to_slice()))"),
917 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_rust())"),
918 "bitcoin::blockdata::transaction::Transaction" => Some(".into_bitcoin()"),
919 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(".into_rust()"),
920 "bitcoin::network::constants::Network" => Some(".into_bitcoin()"),
921 "bitcoin::blockdata::block::BlockHeader" => Some(" }).unwrap()"),
922 "bitcoin::blockdata::block::Block" => Some(".to_slice()).unwrap()"),
924 // Newtypes that we just expose in their original form.
925 "bitcoin::hash_types::Txid" if is_ref => Some(" }[..]).unwrap()"),
926 "bitcoin::hash_types::Txid" => Some(".data[..]).unwrap()"),
927 "bitcoin::hash_types::BlockHash" if !is_ref => Some(".data[..]).unwrap()"),
928 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some(".data)"),
929 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some(" })"),
930 "lightning::ln::channelmanager::PaymentPreimage" if !is_ref => Some(".data)"),
931 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some(" })"),
932 "lightning::ln::channelmanager::PaymentSecret" => Some(".data)"),
934 // List of traits we map (possibly during processing of other files):
935 "crate::util::logger::Logger" => Some(""),
938 }.map(|s| s.to_owned())
941 fn to_c_conversion_new_var_from_path<'b>(&self, full_path: &str, is_ref: bool) -> Option<(&'b str, &'b str)> {
942 if self.is_primitive(full_path) {
946 "[u8]" if is_ref => Some(("crate::c_types::u8slice::from_slice(", ")")),
947 "[usize]" if is_ref => Some(("crate::c_types::usizeslice::from_slice(", ")")),
949 "bitcoin::blockdata::transaction::Transaction" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
950 "bitcoin::blockdata::transaction::Transaction" if !is_ref => Some(("::bitcoin::consensus::encode::serialize(&", ")")),
951 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(("{ let mut s = [0u8; 80]; s[..].copy_from_slice(&::bitcoin::consensus::encode::serialize(", ")); s }")),
952 "bitcoin::blockdata::block::Block" if is_ref => Some(("::bitcoin::consensus::encode::serialize(", ")")),
953 "bitcoin::hash_types::Txid" => None,
955 // Override the default since Records contain an fmt with a lifetime:
956 // TODO: We should include the other record fields
957 "lightning::util::logger::Record" => Some(("std::ffi::CString::new(format!(\"{}\", ", ".args)).unwrap()")),
959 }.map(|s| s.to_owned())
961 fn to_c_conversion_inline_prefix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
962 if self.is_primitive(full_path) {
963 return Some("".to_owned());
966 "Result" if !is_ref => Some("local_"),
967 "Vec" if !is_ref => Some("local_"),
968 "Option" => Some("local_"),
970 "[u8; 32]" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
971 "[u8; 32]" if is_ref => Some("&"),
972 "[u8; 16]" if !is_ref => Some("crate::c_types::SixteenBytes { data: "),
973 "[u8; 10]" if !is_ref => Some("crate::c_types::TenBytes { data: "),
974 "[u8; 4]" if !is_ref => Some("crate::c_types::FourBytes { data: "),
975 "[u8; 3]" if is_ref => Some("&"),
977 "[u8]" if is_ref => Some("local_"),
978 "[usize]" if is_ref => Some("local_"),
980 "str" if is_ref => Some(""),
981 "String" => Some(""),
983 "std::time::Duration" => Some(""),
984 "std::io::Error" if !is_ref => Some("crate::c_types::IOError::from_rust("),
986 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
987 => Some("crate::c_types::PublicKey::from_rust(&"),
988 "bitcoin::secp256k1::Signature" => Some("crate::c_types::Signature::from_rust(&"),
989 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
990 if is_ref => Some(""),
991 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
992 if !is_ref => Some("crate::c_types::SecretKey::from_rust("),
993 "bitcoin::secp256k1::Error" if !is_ref => Some("crate::c_types::Secp256k1Error::from_rust("),
994 "bitcoin::blockdata::script::Script" if is_ref => Some("crate::c_types::u8slice::from_slice(&"),
995 "bitcoin::blockdata::script::Script" if !is_ref => Some(""),
996 "bitcoin::blockdata::transaction::Transaction" => Some("crate::c_types::Transaction::from_vec(local_"),
997 "bitcoin::blockdata::transaction::OutPoint" => Some("crate::c_types::bitcoin_to_C_outpoint("),
998 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some("crate::c_types::TxOut::from_rust("),
999 "bitcoin::network::constants::Network" => Some("crate::bitcoin::network::Network::from_bitcoin("),
1000 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some("&local_"),
1001 "bitcoin::blockdata::block::Block" if is_ref => Some("crate::c_types::u8slice::from_slice(&local_"),
1003 "bitcoin::hash_types::Txid" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1005 // Newtypes that we just expose in their original form.
1006 "bitcoin::hash_types::Txid" if is_ref => Some(""),
1007 "bitcoin::hash_types::BlockHash" if is_ref => Some(""),
1008 "bitcoin::hash_types::BlockHash" => Some("crate::c_types::ThirtyTwoBytes { data: "),
1009 "bitcoin::secp256k1::Message" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1010 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some("&"),
1011 "lightning::ln::channelmanager::PaymentHash" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1012 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some("&"),
1013 "lightning::ln::channelmanager::PaymentPreimage" => Some("crate::c_types::ThirtyTwoBytes { data: "),
1014 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some("crate::c_types::ThirtyTwoBytes { data: "),
1016 // Override the default since Records contain an fmt with a lifetime:
1017 "lightning::util::logger::Record" => Some("local_"),
1020 }.map(|s| s.to_owned())
1022 fn to_c_conversion_inline_suffix_from_path(&self, full_path: &str, is_ref: bool, _ptr_for_ref: bool) -> Option<String> {
1023 if self.is_primitive(full_path) {
1024 return Some("".to_owned());
1027 "Result" if !is_ref => Some(""),
1028 "Vec" if !is_ref => Some(".into()"),
1029 "Option" => Some(""),
1031 "[u8; 32]" if !is_ref => Some(" }"),
1032 "[u8; 32]" if is_ref => Some(""),
1033 "[u8; 16]" if !is_ref => Some(" }"),
1034 "[u8; 10]" if !is_ref => Some(" }"),
1035 "[u8; 4]" if !is_ref => Some(" }"),
1036 "[u8; 3]" if is_ref => Some(""),
1038 "[u8]" if is_ref => Some(""),
1039 "[usize]" if is_ref => Some(""),
1041 "str" if is_ref => Some(".into()"),
1042 "String" if !is_ref => Some(".into_bytes().into()"),
1043 "String" if is_ref => Some(".as_str().into()"),
1045 "std::time::Duration" => Some(".as_secs()"),
1046 "std::io::Error" if !is_ref => Some(")"),
1048 "bitcoin::secp256k1::key::PublicKey"|"bitcoin::secp256k1::PublicKey"
1050 "bitcoin::secp256k1::Signature" => Some(")"),
1051 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1052 if !is_ref => Some(")"),
1053 "bitcoin::secp256k1::key::SecretKey"|"bitcoin::secp256k1::SecretKey"
1054 if is_ref => Some(".as_ref()"),
1055 "bitcoin::secp256k1::Error" if !is_ref => Some(")"),
1056 "bitcoin::blockdata::script::Script" if is_ref => Some("[..])"),
1057 "bitcoin::blockdata::script::Script" if !is_ref => Some(".into_bytes().into()"),
1058 "bitcoin::blockdata::transaction::Transaction" => Some(")"),
1059 "bitcoin::blockdata::transaction::OutPoint" => Some(")"),
1060 "bitcoin::blockdata::transaction::TxOut" if !is_ref => Some(")"),
1061 "bitcoin::network::constants::Network" => Some(")"),
1062 "bitcoin::blockdata::block::BlockHeader" if is_ref => Some(""),
1063 "bitcoin::blockdata::block::Block" if is_ref => Some(")"),
1065 "bitcoin::hash_types::Txid" if !is_ref => Some(".into_inner() }"),
1067 // Newtypes that we just expose in their original form.
1068 "bitcoin::hash_types::Txid" if is_ref => Some(".as_inner()"),
1069 "bitcoin::hash_types::BlockHash" if is_ref => Some(".as_inner()"),
1070 "bitcoin::hash_types::BlockHash" => Some(".into_inner() }"),
1071 "bitcoin::secp256k1::Message" if !is_ref => Some(".as_ref().clone() }"),
1072 "lightning::ln::channelmanager::PaymentHash" if is_ref => Some(".0"),
1073 "lightning::ln::channelmanager::PaymentHash" => Some(".0 }"),
1074 "lightning::ln::channelmanager::PaymentPreimage" if is_ref => Some(".0"),
1075 "lightning::ln::channelmanager::PaymentPreimage" => Some(".0 }"),
1076 "lightning::ln::channelmanager::PaymentSecret" if !is_ref => Some(".0 }"),
1078 // Override the default since Records contain an fmt with a lifetime:
1079 "lightning::util::logger::Record" => Some(".as_ptr()"),
1082 }.map(|s| s.to_owned())
1085 fn empty_val_check_suffix_from_path(&self, full_path: &str) -> Option<&str> {
1087 "lightning::ln::channelmanager::PaymentSecret" => Some(".data == [0; 32]"),
1088 "bitcoin::secp256k1::key::PublicKey" => Some(".is_null()"),
1089 "bitcoin::secp256k1::Signature" => Some(".is_null()"),
1094 // ****************************
1095 // *** Container Processing ***
1096 // ****************************
1098 /// Returns the module path in the generated mapping crate to the containers which we generate
1099 /// when writing to CrateTypes::template_file.
1100 pub fn generated_container_path() -> &'static str {
1101 "crate::c_types::derived"
1103 /// Returns the module path in the generated mapping crate to the container templates, which
1104 /// are then concretized and put in the generated container path/template_file.
1105 fn container_templ_path() -> &'static str {
1109 /// Returns true if the path containing the given args is a "transparent" container, ie an
1110 /// Option or a container which does not require a generated continer class.
1111 fn is_transparent_container<'i, I: Iterator<Item=&'i syn::Type>>(&self, full_path: &str, _is_ref: bool, mut args: I) -> bool {
1112 if full_path == "Option" {
1113 let inner = args.next().unwrap();
1114 assert!(args.next().is_none());
1116 syn::Type::Reference(_) => true,
1117 syn::Type::Path(p) => {
1118 if let Some(resolved) = self.maybe_resolve_path(&p.path, None) {
1119 if self.is_primitive(&resolved) { false } else { true }
1122 syn::Type::Tuple(_) => false,
1123 _ => unimplemented!(),
1127 /// Returns true if the path is a "transparent" container, ie an Option or a container which does
1128 /// not require a generated continer class.
1129 fn is_path_transparent_container(&self, full_path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
1130 let inner_iter = match &full_path.segments.last().unwrap().arguments {
1131 syn::PathArguments::None => return false,
1132 syn::PathArguments::AngleBracketed(args) => args.args.iter().map(|arg| {
1133 if let syn::GenericArgument::Type(ref ty) = arg {
1135 } else { unimplemented!() }
1137 syn::PathArguments::Parenthesized(_) => unimplemented!(),
1139 self.is_transparent_container(&self.resolve_path(full_path, generics), is_ref, inner_iter)
1141 /// Returns true if this is a known, supported, non-transparent container.
1142 fn is_known_container(&self, full_path: &str, is_ref: bool) -> bool {
1143 (full_path == "Result" && !is_ref) || (full_path == "Vec" && !is_ref) || full_path.ends_with("Tuple") || full_path == "Option"
1145 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)
1146 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1147 // expecting one element in the vec per generic type, each of which is inline-converted
1148 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1150 "Result" if !is_ref => {
1152 vec![(" { Ok(mut o) => crate::c_types::CResultTempl::ok(".to_string(), "o".to_string()),
1153 (").into(), Err(mut e) => crate::c_types::CResultTempl::err(".to_string(), "e".to_string())],
1154 ").into() }", ContainerPrefixLocation::PerConv))
1156 "Vec" if !is_ref => {
1157 Some(("Vec::new(); for mut item in ", vec![(format!(".drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1160 Some(("Vec::new(); for item in ", vec![(format!(".iter() {{ local_{}.push(", var_name), "**item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1163 if let Some(syn::Type::Path(p)) = single_contained {
1164 let inner_path = self.resolve_path(&p.path, generics);
1165 if self.is_primitive(&inner_path) {
1166 return Some(("if ", vec![
1167 (format!(".is_none() {{ {}::COption_{}Z::None }} else {{ ", Self::generated_container_path(), inner_path),
1168 format!("{}::COption_{}Z::Some({}.unwrap())", Self::generated_container_path(), inner_path, var_access))
1169 ], " }", ContainerPrefixLocation::NoPrefix));
1170 } else if self.c_type_has_inner_from_path(&inner_path) {
1172 return Some(("if ", vec![
1173 (".is_none() { std::ptr::null() } else { ".to_owned(), format!("({}.as_ref().unwrap())", var_access))
1174 ], " }", ContainerPrefixLocation::OutsideConv));
1176 return Some(("if ", vec![
1177 (".is_none() { std::ptr::null_mut() } else { ".to_owned(), format!("({}.unwrap())", var_access))
1178 ], " }", ContainerPrefixLocation::OutsideConv));
1182 if let Some(t) = single_contained {
1183 let mut v = Vec::new();
1184 self.write_empty_rust_val(generics, &mut v, t);
1185 let s = String::from_utf8(v).unwrap();
1186 return Some(("if ", vec![
1187 (format!(".is_none() {{ {} }} else {{ ", s), format!("({}.unwrap())", var_access))
1188 ], " }", ContainerPrefixLocation::PerConv));
1189 } else { unreachable!(); }
1195 /// only_contained_has_inner implies that there is only one contained element in the container
1196 /// and it has an inner field (ie is an "opaque" type we've defined).
1197 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)
1198 // Returns prefix + Vec<(prefix, var-name-to-inline-convert)> + suffix
1199 // expecting one element in the vec per generic type, each of which is inline-converted
1200 -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)> {
1202 "Result" if !is_ref => {
1204 vec![(".result_ok { true => Ok(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.result)) }})", var_access)),
1205 ("), false => Err(".to_string(), format!("(*unsafe {{ Box::from_raw(<*mut _>::take_ptr(&mut {}.contents.err)) }})", var_access))],
1206 ")}", ContainerPrefixLocation::PerConv))
1208 "Slice" if is_ref => {
1209 Some(("Vec::new(); for mut item in ", vec![(format!(".as_slice().iter() {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1212 Some(("Vec::new(); for mut item in ", vec![(format!(".into_rust().drain(..) {{ local_{}.push(", var_name), "item".to_string())], "); }", ContainerPrefixLocation::PerConv))
1215 if let Some(syn::Type::Path(p)) = single_contained {
1216 let inner_path = self.resolve_path(&p.path, generics);
1217 if self.is_primitive(&inner_path) {
1218 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::NoPrefix))
1219 } else if self.c_type_has_inner_from_path(&inner_path) {
1221 return Some(("if ", vec![(".inner.is_null() { None } else { Some((*".to_string(), format!("{}", var_access))], ").clone()) }", ContainerPrefixLocation::PerConv))
1223 return Some(("if ", vec![(".inner.is_null() { None } else { Some(".to_string(), format!("{}", var_access))], ") }", ContainerPrefixLocation::PerConv));
1228 if let Some(t) = single_contained {
1230 syn::Type::Reference(_)|syn::Type::Path(_)|syn::Type::Slice(_) => {
1231 let mut v = Vec::new();
1232 let ret_ref = self.write_empty_rust_val_check_suffix(generics, &mut v, t);
1233 let s = String::from_utf8(v).unwrap();
1235 EmptyValExpectedTy::ReferenceAsPointer =>
1236 return Some(("if ", vec![
1237 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ &mut *{} }}", var_access))
1238 ], ") }", ContainerPrefixLocation::NoPrefix)),
1239 EmptyValExpectedTy::OwnedPointer => {
1240 if let syn::Type::Slice(_) = t {
1243 return Some(("if ", vec![
1244 (format!("{} {{ None }} else {{ Some(", s), format!("unsafe {{ *Box::from_raw({}) }}", var_access))
1245 ], ") }", ContainerPrefixLocation::NoPrefix));
1247 EmptyValExpectedTy::NonPointer =>
1248 return Some(("if ", vec![
1249 (format!("{} {{ None }} else {{ Some(", s), format!("{}", var_access))
1250 ], ") }", ContainerPrefixLocation::PerConv)),
1253 syn::Type::Tuple(_) => {
1254 return Some(("if ", vec![(".is_some() { Some(".to_string(), format!("{}.take()", var_access))], ") } else { None }", ContainerPrefixLocation::PerConv))
1256 _ => unimplemented!(),
1258 } else { unreachable!(); }
1264 // *************************************************
1265 // *** Type definition during main.rs processing ***
1266 // *************************************************
1268 pub fn get_declared_type(&'a self, ident: &syn::Ident) -> Option<&'a DeclType<'c>> {
1269 self.types.get_declared_type(ident)
1271 /// Returns true if the object at the given path is mapped as X { inner: *mut origX, .. }.
1272 pub fn c_type_has_inner_from_path(&self, full_path: &str) -> bool{
1273 self.crate_types.opaques.get(full_path).is_some()
1276 pub fn maybe_resolve_ident(&self, id: &syn::Ident) -> Option<String> {
1277 self.types.maybe_resolve_ident(id)
1280 pub fn maybe_resolve_non_ignored_ident(&self, id: &syn::Ident) -> Option<String> {
1281 self.types.maybe_resolve_non_ignored_ident(id)
1284 pub fn maybe_resolve_path(&self, p_arg: &syn::Path, generics: Option<&GenericTypes>) -> Option<String> {
1285 self.types.maybe_resolve_path(p_arg, generics)
1287 pub fn resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> String {
1288 self.maybe_resolve_path(p, generics).unwrap()
1291 // ***********************************
1292 // *** Original Rust Type Printing ***
1293 // ***********************************
1295 fn in_rust_prelude(resolved_path: &str) -> bool {
1296 match resolved_path {
1304 fn write_rust_path<W: std::io::Write>(&self, w: &mut W, generics_resolver: Option<&GenericTypes>, path: &syn::Path) {
1305 if let Some(resolved) = self.maybe_resolve_path(&path, generics_resolver) {
1306 if self.is_primitive(&resolved) {
1307 write!(w, "{}", path.get_ident().unwrap()).unwrap();
1309 // TODO: We should have a generic "is from a dependency" check here instead of
1310 // checking for "bitcoin" explicitly.
1311 if resolved.starts_with("bitcoin::") || Self::in_rust_prelude(&resolved) {
1312 write!(w, "{}", resolved).unwrap();
1313 // If we're printing a generic argument, it needs to reference the crate, otherwise
1314 // the original crate:
1315 } else if self.maybe_resolve_path(&path, None).as_ref() == Some(&resolved) {
1316 write!(w, "{}", resolved).unwrap();
1318 write!(w, "crate::{}", resolved).unwrap();
1321 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().last().unwrap().arguments {
1322 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1325 if path.leading_colon.is_some() {
1326 write!(w, "::").unwrap();
1328 for (idx, seg) in path.segments.iter().enumerate() {
1329 if idx != 0 { write!(w, "::").unwrap(); }
1330 write!(w, "{}", seg.ident).unwrap();
1331 if let syn::PathArguments::AngleBracketed(args) = &seg.arguments {
1332 self.write_rust_generic_arg(w, generics_resolver, args.args.iter());
1337 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>) {
1338 let mut had_params = false;
1339 for (idx, arg) in generics.enumerate() {
1340 if idx != 0 { write!(w, ", ").unwrap(); } else { write!(w, "<").unwrap(); }
1343 syn::GenericParam::Lifetime(lt) => write!(w, "'{}", lt.lifetime.ident).unwrap(),
1344 syn::GenericParam::Type(t) => {
1345 write!(w, "{}", t.ident).unwrap();
1346 if t.colon_token.is_some() { write!(w, ":").unwrap(); }
1347 for (idx, bound) in t.bounds.iter().enumerate() {
1348 if idx != 0 { write!(w, " + ").unwrap(); }
1350 syn::TypeParamBound::Trait(tb) => {
1351 if tb.paren_token.is_some() || tb.lifetimes.is_some() { unimplemented!(); }
1352 self.write_rust_path(w, generics_resolver, &tb.path);
1354 _ => unimplemented!(),
1357 if t.eq_token.is_some() || t.default.is_some() { unimplemented!(); }
1359 _ => unimplemented!(),
1362 if had_params { write!(w, ">").unwrap(); }
1365 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>) {
1366 write!(w, "<").unwrap();
1367 for (idx, arg) in generics.enumerate() {
1368 if idx != 0 { write!(w, ", ").unwrap(); }
1370 syn::GenericArgument::Type(t) => self.write_rust_type(w, generics_resolver, t),
1371 _ => unimplemented!(),
1374 write!(w, ">").unwrap();
1376 pub fn write_rust_type<W: std::io::Write>(&self, w: &mut W, generics: Option<&GenericTypes>, t: &syn::Type) {
1378 syn::Type::Path(p) => {
1379 if p.qself.is_some() {
1382 self.write_rust_path(w, generics, &p.path);
1384 syn::Type::Reference(r) => {
1385 write!(w, "&").unwrap();
1386 if let Some(lft) = &r.lifetime {
1387 write!(w, "'{} ", lft.ident).unwrap();
1389 if r.mutability.is_some() {
1390 write!(w, "mut ").unwrap();
1392 self.write_rust_type(w, generics, &*r.elem);
1394 syn::Type::Array(a) => {
1395 write!(w, "[").unwrap();
1396 self.write_rust_type(w, generics, &a.elem);
1397 if let syn::Expr::Lit(l) = &a.len {
1398 if let syn::Lit::Int(i) = &l.lit {
1399 write!(w, "; {}]", i).unwrap();
1400 } else { unimplemented!(); }
1401 } else { unimplemented!(); }
1403 syn::Type::Slice(s) => {
1404 write!(w, "[").unwrap();
1405 self.write_rust_type(w, generics, &s.elem);
1406 write!(w, "]").unwrap();
1408 syn::Type::Tuple(s) => {
1409 write!(w, "(").unwrap();
1410 for (idx, t) in s.elems.iter().enumerate() {
1411 if idx != 0 { write!(w, ", ").unwrap(); }
1412 self.write_rust_type(w, generics, &t);
1414 write!(w, ")").unwrap();
1416 _ => unimplemented!(),
1420 /// Prints a constructor for something which is "uninitialized" (but obviously not actually
1421 /// unint'd memory).
1422 pub fn write_empty_rust_val<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) {
1424 syn::Type::Path(p) => {
1425 let resolved = self.resolve_path(&p.path, generics);
1426 if self.crate_types.opaques.get(&resolved).is_some() {
1427 write!(w, "crate::{} {{ inner: std::ptr::null_mut(), is_owned: true }}", resolved).unwrap();
1429 // Assume its a manually-mapped C type, where we can just define an null() fn
1430 write!(w, "{}::null()", self.c_type_from_path(&resolved, false, false).unwrap()).unwrap();
1433 syn::Type::Array(a) => {
1434 if let syn::Expr::Lit(l) = &a.len {
1435 if let syn::Lit::Int(i) = &l.lit {
1436 if i.base10_digits().parse::<usize>().unwrap() < 32 {
1437 // Blindly assume that if we're trying to create an empty value for an
1438 // array < 32 entries that all-0s may be a valid state.
1441 let arrty = format!("[u8; {}]", i.base10_digits());
1442 write!(w, "{}", self.to_c_conversion_inline_prefix_from_path(&arrty, false, false).unwrap()).unwrap();
1443 write!(w, "[0; {}]", i.base10_digits()).unwrap();
1444 write!(w, "{}", self.to_c_conversion_inline_suffix_from_path(&arrty, false, false).unwrap()).unwrap();
1445 } else { unimplemented!(); }
1446 } else { unimplemented!(); }
1448 _ => unimplemented!(),
1452 fn is_real_type_array(&self, resolved_type: &str) -> Option<syn::Type> {
1453 if let Some(real_ty) = self.c_type_from_path(&resolved_type, true, false) {
1454 if real_ty.ends_with("]") && real_ty.starts_with("*const [u8; ") {
1455 let mut split = real_ty.split("; ");
1456 split.next().unwrap();
1457 let tail_str = split.next().unwrap();
1458 assert!(split.next().is_none());
1459 let len = &tail_str[..tail_str.len() - 1];
1460 Some(syn::Type::Array(syn::TypeArray {
1461 bracket_token: syn::token::Bracket { span: Span::call_site() },
1462 elem: Box::new(syn::Type::Path(syn::TypePath {
1464 path: syn::Path::from(syn::PathSegment::from(syn::Ident::new("u8", Span::call_site()))),
1466 semi_token: syn::Token!(;)(Span::call_site()),
1467 len: syn::Expr::Lit(syn::ExprLit { attrs: Vec::new(), lit: syn::Lit::Int(syn::LitInt::new(len, Span::call_site())) }),
1473 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1474 /// See EmptyValExpectedTy for information on return types.
1475 fn write_empty_rust_val_check_suffix<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type) -> EmptyValExpectedTy {
1477 syn::Type::Path(p) => {
1478 let resolved = self.resolve_path(&p.path, generics);
1479 if let Some(arr_ty) = self.is_real_type_array(&resolved) {
1480 write!(w, ".data").unwrap();
1481 return self.write_empty_rust_val_check_suffix(generics, w, &arr_ty);
1483 if self.crate_types.opaques.get(&resolved).is_some() {
1484 write!(w, ".inner.is_null()").unwrap();
1485 EmptyValExpectedTy::NonPointer
1487 if let Some(suffix) = self.empty_val_check_suffix_from_path(&resolved) {
1488 write!(w, "{}", suffix).unwrap();
1489 // We may eventually need to allow empty_val_check_suffix_from_path to specify if we need a deref or not
1490 EmptyValExpectedTy::NonPointer
1492 write!(w, " == std::ptr::null_mut()").unwrap();
1493 EmptyValExpectedTy::OwnedPointer
1497 syn::Type::Array(a) => {
1498 if let syn::Expr::Lit(l) = &a.len {
1499 if let syn::Lit::Int(i) = &l.lit {
1500 write!(w, " == [0; {}]", i.base10_digits()).unwrap();
1501 EmptyValExpectedTy::NonPointer
1502 } else { unimplemented!(); }
1503 } else { unimplemented!(); }
1505 syn::Type::Slice(_) => {
1506 // Option<[]> always implies that we want to treat len() == 0 differently from
1507 // None, so we always map an Option<[]> into a pointer.
1508 write!(w, " == std::ptr::null_mut()").unwrap();
1509 EmptyValExpectedTy::ReferenceAsPointer
1511 _ => unimplemented!(),
1515 /// Prints a suffix to determine if a variable is empty (ie was set by write_empty_rust_val).
1516 pub fn write_empty_rust_val_check<W: std::io::Write>(&self, generics: Option<&GenericTypes>, w: &mut W, t: &syn::Type, var_access: &str) {
1518 syn::Type::Path(_) => {
1519 write!(w, "{}", var_access).unwrap();
1520 self.write_empty_rust_val_check_suffix(generics, w, t);
1522 syn::Type::Array(a) => {
1523 if let syn::Expr::Lit(l) = &a.len {
1524 if let syn::Lit::Int(i) = &l.lit {
1525 let arrty = format!("[u8; {}]", i.base10_digits());
1526 // We don't (yet) support a new-var conversion here.
1527 assert!(self.from_c_conversion_new_var_from_path(&arrty, false).is_none());
1529 self.from_c_conversion_prefix_from_path(&arrty, false).unwrap(),
1531 self.from_c_conversion_suffix_from_path(&arrty, false).unwrap()).unwrap();
1532 self.write_empty_rust_val_check_suffix(generics, w, t);
1533 } else { unimplemented!(); }
1534 } else { unimplemented!(); }
1536 _ => unimplemented!(),
1540 // ********************************
1541 // *** Type conversion printing ***
1542 // ********************************
1544 /// Returns true we if can just skip passing this to C entirely
1545 pub fn skip_arg(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
1547 syn::Type::Path(p) => {
1548 if p.qself.is_some() { unimplemented!(); }
1549 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1550 self.skip_path(&full_path)
1553 syn::Type::Reference(r) => {
1554 self.skip_arg(&*r.elem, generics)
1559 pub fn no_arg_to_rust<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1561 syn::Type::Path(p) => {
1562 if p.qself.is_some() { unimplemented!(); }
1563 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
1564 write!(w, "{}", self.no_arg_path_to_rust(&full_path)).unwrap();
1567 syn::Type::Reference(r) => {
1568 self.no_arg_to_rust(w, &*r.elem, generics);
1574 fn write_conversion_inline_intern<W: std::io::Write,
1575 LP: Fn(&str, bool, bool) -> Option<String>, DL: Fn(&mut W, &DeclType, &str, bool, bool), SC: Fn(bool) -> &'static str>
1576 (&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool,
1577 tupleconv: &str, prefix: bool, sliceconv: SC, path_lookup: LP, decl_lookup: DL) {
1579 syn::Type::Reference(r) => {
1580 self.write_conversion_inline_intern(w, &*r.elem, generics, true, r.mutability.is_some(),
1581 ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1583 syn::Type::Path(p) => {
1584 if p.qself.is_some() {
1588 let resolved_path = self.resolve_path(&p.path, generics);
1589 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1590 return self.write_conversion_inline_intern(w, aliased_type, None, is_ref, is_mut, ptr_for_ref, tupleconv, prefix, sliceconv, path_lookup, decl_lookup);
1591 } else if let Some(c_type) = path_lookup(&resolved_path, is_ref, ptr_for_ref) {
1592 write!(w, "{}", c_type).unwrap();
1593 } else if self.crate_types.opaques.get(&resolved_path).is_some() {
1594 decl_lookup(w, &DeclType::StructImported, &resolved_path, is_ref, is_mut);
1595 } else if self.crate_types.mirrored_enums.get(&resolved_path).is_some() {
1596 decl_lookup(w, &DeclType::MirroredEnum, &resolved_path, is_ref, is_mut);
1597 } else if let Some(t) = self.crate_types.traits.get(&resolved_path) {
1598 decl_lookup(w, &DeclType::Trait(t), &resolved_path, is_ref, is_mut);
1599 } else if let Some(ident) = single_ident_generic_path_to_ident(&p.path) {
1600 if let Some(decl_type) = self.types.maybe_resolve_declared(ident) {
1601 decl_lookup(w, decl_type, &self.maybe_resolve_ident(ident).unwrap(), is_ref, is_mut);
1602 } else { unimplemented!(); }
1603 } else { unimplemented!(); }
1605 syn::Type::Array(a) => {
1606 // We assume all arrays contain only [int_literal; X]s.
1607 // This may result in some outputs not compiling.
1608 if let syn::Expr::Lit(l) = &a.len {
1609 if let syn::Lit::Int(i) = &l.lit {
1610 write!(w, "{}", path_lookup(&format!("[u8; {}]", i.base10_digits()), is_ref, ptr_for_ref).unwrap()).unwrap();
1611 } else { unimplemented!(); }
1612 } else { unimplemented!(); }
1614 syn::Type::Slice(s) => {
1615 // We assume all slices contain only literals or references.
1616 // This may result in some outputs not compiling.
1617 if let syn::Type::Path(p) = &*s.elem {
1618 let resolved = self.resolve_path(&p.path, generics);
1619 assert!(self.is_primitive(&resolved));
1620 write!(w, "{}", path_lookup("[u8]", is_ref, ptr_for_ref).unwrap()).unwrap();
1621 } else if let syn::Type::Reference(r) = &*s.elem {
1622 if let syn::Type::Path(p) = &*r.elem {
1623 write!(w, "{}", sliceconv(self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)))).unwrap();
1624 } else { unimplemented!(); }
1625 } else if let syn::Type::Tuple(t) = &*s.elem {
1626 assert!(!t.elems.is_empty());
1628 write!(w, "&local_").unwrap();
1630 let mut needs_map = false;
1631 for e in t.elems.iter() {
1632 if let syn::Type::Reference(_) = e {
1637 write!(w, ".iter().map(|(").unwrap();
1638 for i in 0..t.elems.len() {
1639 write!(w, "{}{}", if i != 0 { ", " } else { "" }, ('a' as u8 + i as u8) as char).unwrap();
1641 write!(w, ")| (").unwrap();
1642 for (idx, e) in t.elems.iter().enumerate() {
1643 if let syn::Type::Reference(_) = e {
1644 write!(w, "{}{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1645 } else if let syn::Type::Path(_) = e {
1646 write!(w, "{}*{}", if idx != 0 { ", " } else { "" }, (idx as u8 + 'a' as u8) as char).unwrap();
1647 } else { unimplemented!(); }
1649 write!(w, ")).collect::<Vec<_>>()[..]").unwrap();
1652 } else { unimplemented!(); }
1654 syn::Type::Tuple(t) => {
1655 if t.elems.is_empty() {
1656 // cbindgen has poor support for (), see, eg https://github.com/eqrion/cbindgen/issues/527
1657 // so work around it by just pretending its a 0u8
1658 write!(w, "{}", tupleconv).unwrap();
1660 if prefix { write!(w, "local_").unwrap(); }
1663 _ => unimplemented!(),
1667 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) {
1668 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "0u8 /*", true, |_| "local_",
1669 |a, b, c| self.to_c_conversion_inline_prefix_from_path(a, b, c),
1670 |w, decl_type, decl_path, is_ref, _is_mut| {
1672 DeclType::MirroredEnum if is_ref && ptr_for_ref => write!(w, "crate::{}::from_native(&", decl_path).unwrap(),
1673 DeclType::MirroredEnum if is_ref => write!(w, "&crate::{}::from_native(&", decl_path).unwrap(),
1674 DeclType::MirroredEnum => write!(w, "crate::{}::native_into(", decl_path).unwrap(),
1675 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref && from_ptr =>
1676 write!(w, "crate::{} {{ inner: unsafe {{ (", decl_path).unwrap(),
1677 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref =>
1678 write!(w, "crate::{} {{ inner: unsafe {{ ( (&(", decl_path).unwrap(),
1679 DeclType::EnumIgnored|DeclType::StructImported if is_ref =>
1680 write!(w, "&crate::{} {{ inner: unsafe {{ (", decl_path).unwrap(),
1681 DeclType::EnumIgnored|DeclType::StructImported if !is_ref && from_ptr =>
1682 write!(w, "crate::{} {{ inner: ", decl_path).unwrap(),
1683 DeclType::EnumIgnored|DeclType::StructImported if !is_ref =>
1684 write!(w, "crate::{} {{ inner: Box::into_raw(Box::new(", decl_path).unwrap(),
1685 DeclType::Trait(_) if is_ref => write!(w, "&").unwrap(),
1686 DeclType::Trait(_) if !is_ref => {},
1687 _ => panic!("{:?}", decl_path),
1691 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) {
1692 self.write_to_c_conversion_inline_prefix_inner(w, t, generics, false, ptr_for_ref, false);
1694 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) {
1695 self.write_conversion_inline_intern(w, t, generics, is_ref, false, ptr_for_ref, "*/", false, |_| ".into()",
1696 |a, b, c| self.to_c_conversion_inline_suffix_from_path(a, b, c),
1697 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1698 DeclType::MirroredEnum => write!(w, ")").unwrap(),
1699 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref && from_ptr =>
1700 write!(w, " as *const _) as *mut _ }}, is_owned: false }}").unwrap(),
1701 DeclType::EnumIgnored|DeclType::StructImported if is_ref && ptr_for_ref =>
1702 write!(w, ") as *const _) as *mut _) }}, is_owned: false }}").unwrap(),
1703 DeclType::EnumIgnored|DeclType::StructImported if is_ref =>
1704 write!(w, " as *const _) as *mut _ }}, is_owned: false }}").unwrap(),
1705 DeclType::EnumIgnored|DeclType::StructImported if !is_ref && from_ptr =>
1706 write!(w, ", is_owned: true }}").unwrap(),
1707 DeclType::EnumIgnored|DeclType::StructImported if !is_ref => write!(w, ")), is_owned: true }}").unwrap(),
1708 DeclType::Trait(_) if is_ref => {},
1709 DeclType::Trait(_) => {
1710 // This is used when we're converting a concrete Rust type into a C trait
1711 // for use when a Rust trait method returns an associated type.
1712 // Because all of our C traits implement From<RustTypesImplementingTraits>
1713 // we can just call .into() here and be done.
1714 write!(w, ".into()").unwrap()
1716 _ => unimplemented!(),
1719 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) {
1720 self.write_to_c_conversion_inline_suffix_inner(w, t, generics, false, ptr_for_ref, false);
1723 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) {
1724 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "() /*", true, |_| "&local_",
1725 |a, b, _c| self.from_c_conversion_prefix_from_path(a, b),
1726 |w, decl_type, _full_path, is_ref, is_mut| match decl_type {
1727 DeclType::StructImported if is_ref && ptr_for_ref => write!(w, "unsafe {{ &*(*").unwrap(),
1728 DeclType::StructImported if is_mut && is_ref => write!(w, "unsafe {{ &mut *").unwrap(),
1729 DeclType::StructImported if is_ref => write!(w, "unsafe {{ &*").unwrap(),
1730 DeclType::StructImported if !is_ref => write!(w, "*unsafe {{ Box::from_raw(").unwrap(),
1731 DeclType::MirroredEnum if is_ref => write!(w, "&").unwrap(),
1732 DeclType::MirroredEnum => {},
1733 DeclType::Trait(_) => {},
1734 _ => unimplemented!(),
1737 pub fn write_from_c_conversion_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1738 self.write_from_c_conversion_prefix_inner(w, t, generics, false, false);
1740 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) {
1741 self.write_conversion_inline_intern(w, t, generics, is_ref, false, false, "*/", false,
1742 |has_inner| match has_inner {
1743 false => ".iter().collect::<Vec<_>>()[..]",
1746 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
1747 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1748 DeclType::StructImported if is_ref && ptr_for_ref => write!(w, ").inner }}").unwrap(),
1749 DeclType::StructImported if is_ref => write!(w, ".inner }}").unwrap(),
1750 DeclType::StructImported if !is_ref => write!(w, ".take_inner()) }}").unwrap(),
1751 DeclType::MirroredEnum if is_ref => write!(w, ".to_native()").unwrap(),
1752 DeclType::MirroredEnum => write!(w, ".into_native()").unwrap(),
1753 DeclType::Trait(_) => {},
1754 _ => unimplemented!(),
1757 pub fn write_from_c_conversion_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1758 self.write_from_c_conversion_suffix_inner(w, t, generics, false, false);
1760 // Note that compared to the above conversion functions, the following two are generally
1761 // significantly undertested:
1762 pub fn write_from_c_conversion_to_ref_prefix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1763 self.write_conversion_inline_intern(w, t, generics, false, false, false, "() /*", true, |_| "&local_",
1765 if let Some(conv) = self.from_c_conversion_prefix_from_path(a, b) {
1766 Some(format!("&{}", conv))
1769 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1770 DeclType::StructImported if !is_ref => write!(w, "unsafe {{ &*").unwrap(),
1771 _ => unimplemented!(),
1774 pub fn write_from_c_conversion_to_ref_suffix<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>) {
1775 self.write_conversion_inline_intern(w, t, generics, false, false, false, "*/", false,
1776 |has_inner| match has_inner {
1777 false => ".iter().collect::<Vec<_>>()[..]",
1780 |a, b, _c| self.from_c_conversion_suffix_from_path(a, b),
1781 |w, decl_type, _full_path, is_ref, _is_mut| match decl_type {
1782 DeclType::StructImported if !is_ref => write!(w, ".inner }}").unwrap(),
1783 _ => unimplemented!(),
1787 fn write_conversion_new_var_intern<'b, W: std::io::Write,
1788 LP: Fn(&str, bool) -> Option<(&str, &str)>,
1789 LC: Fn(&str, bool, Option<&syn::Type>, &syn::Ident, &str) -> Option<(&'b str, Vec<(String, String)>, &'b str, ContainerPrefixLocation)>,
1790 VP: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool),
1791 VS: Fn(&mut W, &syn::Type, Option<&GenericTypes>, bool, bool, bool)>
1792 (&self, w: &mut W, ident: &syn::Ident, var: &str, t: &syn::Type, generics: Option<&GenericTypes>,
1793 mut is_ref: bool, mut ptr_for_ref: bool, to_c: bool,
1794 path_lookup: &LP, container_lookup: &LC, var_prefix: &VP, var_suffix: &VS) -> bool {
1796 macro_rules! convert_container {
1797 ($container_type: expr, $args_len: expr, $args_iter: expr) => { {
1798 // For slices (and Options), we refuse to directly map them as is_ref when they
1799 // aren't opaque types containing an inner pointer. This is due to the fact that,
1800 // in both cases, the actual higher-level type is non-is_ref.
1801 let ty_has_inner = if $args_len == 1 {
1802 let ty = $args_iter().next().unwrap();
1803 if $container_type == "Slice" && to_c {
1804 // "To C ptr_for_ref" means "return the regular object with is_owned
1805 // set to false", which is totally what we want in a slice if we're about to
1806 // set ty_has_inner.
1809 if let syn::Type::Reference(t) = ty {
1810 if let syn::Type::Path(p) = &*t.elem {
1811 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
1813 } else if let syn::Type::Path(p) = ty {
1814 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
1818 // Options get a bunch of special handling, since in general we map Option<>al
1819 // types into the same C type as non-Option-wrapped types. This ends up being
1820 // pretty manual here and most of the below special-cases are for Options.
1821 let mut needs_ref_map = false;
1822 let mut only_contained_type = None;
1823 let mut only_contained_has_inner = false;
1824 let mut contains_slice = false;
1826 only_contained_has_inner = ty_has_inner;
1827 let arg = $args_iter().next().unwrap();
1828 if let syn::Type::Reference(t) = arg {
1829 only_contained_type = Some(&*t.elem);
1830 if let syn::Type::Path(_) = &*t.elem {
1832 } else if let syn::Type::Slice(_) = &*t.elem {
1833 contains_slice = true;
1834 } else { return false; }
1835 // If the inner element contains an inner pointer, we will just use that,
1836 // avoiding the need to map elements to references. Otherwise we'll need to
1837 // do an extra mapping step.
1838 needs_ref_map = !only_contained_has_inner;
1840 only_contained_type = Some(&arg);
1844 if let Some((prefix, conversions, suffix, prefix_location)) = container_lookup(&$container_type, is_ref && ty_has_inner, only_contained_type, ident, var) {
1845 assert_eq!(conversions.len(), $args_len);
1846 write!(w, "let mut local_{}{} = ", ident, if !to_c && needs_ref_map {"_base"} else { "" }).unwrap();
1847 if prefix_location == ContainerPrefixLocation::OutsideConv {
1848 var_prefix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
1850 write!(w, "{}{}", prefix, var).unwrap();
1852 for ((pfx, var_name), (idx, ty)) in conversions.iter().zip($args_iter().enumerate()) {
1853 let mut var = std::io::Cursor::new(Vec::new());
1854 write!(&mut var, "{}", var_name).unwrap();
1855 let var_access = String::from_utf8(var.into_inner()).unwrap();
1857 let conv_ty = if needs_ref_map { only_contained_type.as_ref().unwrap() } else { ty };
1859 write!(w, "{} {{ ", pfx).unwrap();
1860 let new_var_name = format!("{}_{}", ident, idx);
1861 let new_var = self.write_conversion_new_var_intern(w, &syn::Ident::new(&new_var_name, Span::call_site()),
1862 &var_access, conv_ty, generics, contains_slice || (is_ref && ty_has_inner), ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix);
1863 if new_var { write!(w, " ").unwrap(); }
1865 if prefix_location == ContainerPrefixLocation::PerConv {
1866 var_prefix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
1867 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
1868 write!(w, "Box::into_raw(Box::new(").unwrap();
1871 write!(w, "{}{}", if contains_slice { "local_" } else { "" }, if new_var { new_var_name } else { var_access }).unwrap();
1872 if prefix_location == ContainerPrefixLocation::PerConv {
1873 var_suffix(w, conv_ty, generics, is_ref && ty_has_inner, ptr_for_ref, false);
1874 } else if !is_ref && !needs_ref_map && to_c && only_contained_has_inner {
1875 write!(w, "))").unwrap();
1877 write!(w, " }}").unwrap();
1879 write!(w, "{}", suffix).unwrap();
1880 if prefix_location == ContainerPrefixLocation::OutsideConv {
1881 var_suffix(w, $args_iter().next().unwrap(), generics, is_ref, ptr_for_ref, true);
1883 write!(w, ";").unwrap();
1884 if !to_c && needs_ref_map {
1885 write!(w, " let mut local_{} = local_{}_base.as_ref()", ident, ident).unwrap();
1887 write!(w, ".map(|a| &a[..])").unwrap();
1889 write!(w, ";").unwrap();
1897 syn::Type::Reference(r) => {
1898 if let syn::Type::Slice(_) = &*r.elem {
1899 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, is_ref, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix)
1901 self.write_conversion_new_var_intern(w, ident, var, &*r.elem, generics, true, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix)
1904 syn::Type::Path(p) => {
1905 if p.qself.is_some() {
1908 let resolved_path = self.resolve_path(&p.path, generics);
1909 if let Some(aliased_type) = self.crate_types.type_aliases.get(&resolved_path) {
1910 return self.write_conversion_new_var_intern(w, ident, var, aliased_type, None, is_ref, ptr_for_ref, to_c, path_lookup, container_lookup, var_prefix, var_suffix);
1912 if self.is_known_container(&resolved_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
1913 if let syn::PathArguments::AngleBracketed(args) = &p.path.segments.iter().next().unwrap().arguments {
1914 convert_container!(resolved_path, args.args.len(), || args.args.iter().map(|arg| {
1915 if let syn::GenericArgument::Type(ty) = arg {
1917 } else { unimplemented!(); }
1919 } else { unimplemented!(); }
1921 if self.is_primitive(&resolved_path) {
1923 } else if let Some(ty_ident) = single_ident_generic_path_to_ident(&p.path) {
1924 if let Some((prefix, suffix)) = path_lookup(&resolved_path, is_ref) {
1925 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
1927 } else if self.types.maybe_resolve_declared(ty_ident).is_some() {
1932 syn::Type::Array(_) => {
1933 // We assume all arrays contain only primitive types.
1934 // This may result in some outputs not compiling.
1937 syn::Type::Slice(s) => {
1938 if let syn::Type::Path(p) = &*s.elem {
1939 let resolved = self.resolve_path(&p.path, generics);
1940 assert!(self.is_primitive(&resolved));
1941 let slice_path = format!("[{}]", resolved);
1942 if let Some((prefix, suffix)) = path_lookup(&slice_path, true) {
1943 write!(w, "let mut local_{} = {}{}{};", ident, prefix, var, suffix).unwrap();
1946 } else if let syn::Type::Reference(ty) = &*s.elem {
1947 let tyref = [&*ty.elem];
1949 convert_container!("Slice", 1, || tyref.iter().map(|t| *t));
1950 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
1951 } else if let syn::Type::Tuple(t) = &*s.elem {
1952 // When mapping into a temporary new var, we need to own all the underlying objects.
1953 // Thus, we drop any references inside the tuple and convert with non-reference types.
1954 let mut elems = syn::punctuated::Punctuated::new();
1955 for elem in t.elems.iter() {
1956 if let syn::Type::Reference(r) = elem {
1957 elems.push((*r.elem).clone());
1959 elems.push(elem.clone());
1962 let ty = [syn::Type::Tuple(syn::TypeTuple {
1963 paren_token: t.paren_token, elems
1967 convert_container!("Slice", 1, || ty.iter());
1968 unimplemented!("convert_container should return true as container_lookup should succeed for slices");
1969 } else { unimplemented!() }
1971 syn::Type::Tuple(t) => {
1972 if !t.elems.is_empty() {
1973 // We don't (yet) support tuple elements which cannot be converted inline
1974 write!(w, "let (").unwrap();
1975 for idx in 0..t.elems.len() {
1976 if idx != 0 { write!(w, ", ").unwrap(); }
1977 write!(w, "{} orig_{}_{}", if is_ref { "ref" } else { "mut" }, ident, idx).unwrap();
1979 write!(w, ") = {}{}; ", var, if !to_c { ".to_rust()" } else { "" }).unwrap();
1980 // Like other template types, tuples are always mapped as their non-ref
1981 // versions for types which have different ref mappings. Thus, we convert to
1982 // non-ref versions and handle opaque types with inner pointers manually.
1983 for (idx, elem) in t.elems.iter().enumerate() {
1984 if let syn::Type::Path(p) = elem {
1985 let v_name = format!("orig_{}_{}", ident, idx);
1986 let tuple_elem_ident = syn::Ident::new(&v_name, Span::call_site());
1987 if self.write_conversion_new_var_intern(w, &tuple_elem_ident, &v_name, elem, generics,
1988 false, ptr_for_ref, to_c,
1989 path_lookup, container_lookup, var_prefix, var_suffix) {
1990 write!(w, " ").unwrap();
1991 // Opaque types with inner pointers shouldn't ever create new stack
1992 // variables, so we don't handle it and just assert that it doesn't
1994 assert!(!self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics)));
1998 write!(w, "let mut local_{} = (", ident).unwrap();
1999 for (idx, elem) in t.elems.iter().enumerate() {
2000 let ty_has_inner = {
2002 // "To C ptr_for_ref" means "return the regular object with
2003 // is_owned set to false", which is totally what we want
2004 // if we're about to set ty_has_inner.
2007 if let syn::Type::Reference(t) = elem {
2008 if let syn::Type::Path(p) = &*t.elem {
2009 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2011 } else if let syn::Type::Path(p) = elem {
2012 self.c_type_has_inner_from_path(&self.resolve_path(&p.path, generics))
2015 if idx != 0 { write!(w, ", ").unwrap(); }
2016 var_prefix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2017 if is_ref && ty_has_inner {
2018 // For ty_has_inner, the regular var_prefix mapping will take a
2019 // reference, so deref once here to make sure we keep the original ref.
2020 write!(w, "*").unwrap();
2022 write!(w, "orig_{}_{}", ident, idx).unwrap();
2023 if is_ref && !ty_has_inner {
2024 // If we don't have an inner variable's reference to maintain, just
2025 // hope the type is Clonable and use that.
2026 write!(w, ".clone()").unwrap();
2028 var_suffix(w, elem, generics, is_ref && ty_has_inner, ptr_for_ref, false);
2030 write!(w, "){};", if to_c { ".into()" } else { "" }).unwrap();
2034 _ => unimplemented!(),
2038 pub fn write_to_c_conversion_new_var_inner<W: std::io::Write>(&self, w: &mut W, ident: &syn::Ident, var_access: &str, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) -> bool {
2039 self.write_conversion_new_var_intern(w, ident, var_access, t, generics, false, ptr_for_ref, true,
2040 &|a, b| self.to_c_conversion_new_var_from_path(a, b),
2041 &|a, b, c, d, e| self.to_c_conversion_container_new_var(generics, a, b, c, d, e),
2042 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2043 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_prefix_inner(a, b, c, d, e, f),
2044 &|a, b, c, d, e, f| self.write_to_c_conversion_inline_suffix_inner(a, b, c, d, e, f))
2046 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 {
2047 self.write_to_c_conversion_new_var_inner(w, ident, &format!("{}", ident), t, generics, ptr_for_ref)
2049 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 {
2050 self.write_conversion_new_var_intern(w, ident, &format!("{}", ident), t, generics, false, false, false,
2051 &|a, b| self.from_c_conversion_new_var_from_path(a, b),
2052 &|a, b, c, d, e| self.from_c_conversion_container_new_var(generics, a, b, c, d, e),
2053 // We force ptr_for_ref here since we can't generate a ref on one line and use it later
2054 &|a, b, c, d, e, _f| self.write_from_c_conversion_prefix_inner(a, b, c, d, e),
2055 &|a, b, c, d, e, _f| self.write_from_c_conversion_suffix_inner(a, b, c, d, e))
2058 // ******************************************************
2059 // *** C Container Type Equivalent and alias Printing ***
2060 // ******************************************************
2062 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 {
2063 for (idx, t) in args.enumerate() {
2065 write!(w, ", ").unwrap();
2067 if let syn::Type::Reference(r_arg) = t {
2068 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2070 if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false) { return false; }
2072 // While write_c_type_intern, above is correct, we don't want to blindly convert a
2073 // reference to something stupid, so check that the container is either opaque or a
2074 // predefined type (currently only Transaction).
2075 if let syn::Type::Path(p_arg) = &*r_arg.elem {
2076 let resolved = self.resolve_path(&p_arg.path, generics);
2077 assert!(self.crate_types.opaques.get(&resolved).is_some() ||
2078 self.c_type_from_path(&resolved, true, true).is_some(), "Template generics should be opaque or have a predefined mapping");
2079 } else { unimplemented!(); }
2080 } else if let syn::Type::Path(p_arg) = t {
2081 if let Some(resolved) = self.maybe_resolve_path(&p_arg.path, generics) {
2082 if !self.is_primitive(&resolved) {
2083 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2086 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2088 if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; }
2090 assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners
2091 if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; }
2096 fn check_create_container(&self, mangled_container: String, container_type: &str, args: Vec<&syn::Type>, generics: Option<&GenericTypes>, is_ref: bool) -> bool {
2097 if !self.crate_types.templates_defined.borrow().get(&mangled_container).is_some() {
2098 let mut created_container: Vec<u8> = Vec::new();
2100 if container_type == "Result" {
2101 let mut a_ty: Vec<u8> = Vec::new();
2102 if let syn::Type::Tuple(tup) = args.iter().next().unwrap() {
2103 if tup.elems.is_empty() {
2104 write!(&mut a_ty, "()").unwrap();
2106 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2109 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t).take(1), generics, is_ref) { return false; }
2112 let mut b_ty: Vec<u8> = Vec::new();
2113 if let syn::Type::Tuple(tup) = args.iter().skip(1).next().unwrap() {
2114 if tup.elems.is_empty() {
2115 write!(&mut b_ty, "()").unwrap();
2117 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2120 if !self.write_template_generics(&mut b_ty, &mut args.iter().map(|t| *t).skip(1), generics, is_ref) { return false; }
2123 let ok_str = String::from_utf8(a_ty).unwrap();
2124 let err_str = String::from_utf8(b_ty).unwrap();
2125 let is_clonable = self.is_clonable(&ok_str) && self.is_clonable(&err_str);
2126 write_result_block(&mut created_container, &mangled_container, &ok_str, &err_str, is_clonable);
2128 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2130 } else if container_type == "Vec" {
2131 let mut a_ty: Vec<u8> = Vec::new();
2132 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2133 let ty = String::from_utf8(a_ty).unwrap();
2134 let is_clonable = self.is_clonable(&ty);
2135 write_vec_block(&mut created_container, &mangled_container, &ty, is_clonable);
2137 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2139 } else if container_type.ends_with("Tuple") {
2140 let mut tuple_args = Vec::new();
2141 let mut is_clonable = true;
2142 for arg in args.iter() {
2143 let mut ty: Vec<u8> = Vec::new();
2144 if !self.write_template_generics(&mut ty, &mut [arg].iter().map(|t| **t), generics, is_ref) { return false; }
2145 let ty_str = String::from_utf8(ty).unwrap();
2146 if !self.is_clonable(&ty_str) {
2147 is_clonable = false;
2149 tuple_args.push(ty_str);
2151 write_tuple_block(&mut created_container, &mangled_container, &tuple_args, is_clonable);
2153 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2155 } else if container_type == "Option" {
2156 let mut a_ty: Vec<u8> = Vec::new();
2157 if !self.write_template_generics(&mut a_ty, &mut args.iter().map(|t| *t), generics, is_ref) { return false; }
2158 let ty = String::from_utf8(a_ty).unwrap();
2159 let is_clonable = self.is_clonable(&ty);
2160 write_option_block(&mut created_container, &mangled_container, &ty, is_clonable);
2162 self.crate_types.set_clonable(Self::generated_container_path().to_owned() + "::" + &mangled_container);
2167 self.crate_types.write_new_template(mangled_container.clone(), true, &created_container);
2171 fn path_to_generic_args(path: &syn::Path) -> Vec<&syn::Type> {
2172 if let syn::PathArguments::AngleBracketed(args) = &path.segments.iter().next().unwrap().arguments {
2173 args.args.iter().map(|gen| if let syn::GenericArgument::Type(t) = gen { t } else { unimplemented!() }).collect()
2174 } else { unimplemented!(); }
2176 fn write_c_mangled_container_path_intern<W: std::io::Write>
2177 (&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 {
2178 let mut mangled_type: Vec<u8> = Vec::new();
2179 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2180 write!(w, "C{}_", ident).unwrap();
2181 write!(mangled_type, "C{}_", ident).unwrap();
2182 } else { assert_eq!(args.len(), 1); }
2183 for arg in args.iter() {
2184 macro_rules! write_path {
2185 ($p_arg: expr, $extra_write: expr) => {
2186 if let Some(subtype) = self.maybe_resolve_path(&$p_arg.path, generics) {
2187 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2189 if self.c_type_has_inner_from_path(&subtype) {
2190 if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref) { return false; }
2192 if let Some(arr_ty) = self.is_real_type_array(&subtype) {
2193 if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false) { return false; }
2195 // Option<T> needs to be converted to a *mut T, ie mut ptr-for-ref
2196 if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true) { return false; }
2200 write!(w, "{}", $p_arg.path.segments.last().unwrap().ident).unwrap();
2202 } else if self.is_known_container(&subtype, is_ref) || self.is_path_transparent_container(&$p_arg.path, generics, is_ref) {
2203 if !self.write_c_mangled_container_path_intern(w, Self::path_to_generic_args(&$p_arg.path), generics,
2204 &subtype, is_ref, is_mut, ptr_for_ref, true) {
2207 self.write_c_mangled_container_path_intern(&mut mangled_type, Self::path_to_generic_args(&$p_arg.path),
2208 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2209 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2210 self.write_c_mangled_container_path_intern(w2, Self::path_to_generic_args(&$p_arg.path),
2211 generics, &subtype, is_ref, is_mut, ptr_for_ref, true);
2214 let id = subtype.rsplitn(2, ':').next().unwrap(); // Get the "Base" name of the resolved type
2215 write!(w, "{}", id).unwrap();
2216 write!(mangled_type, "{}", id).unwrap();
2217 if let Some(w2) = $extra_write as Option<&mut Vec<u8>> {
2218 write!(w2, "{}", id).unwrap();
2221 } else { return false; }
2224 if let syn::Type::Tuple(tuple) = arg {
2225 if tuple.elems.len() == 0 {
2226 write!(w, "None").unwrap();
2227 write!(mangled_type, "None").unwrap();
2229 let mut mangled_tuple_type: Vec<u8> = Vec::new();
2231 // Figure out what the mangled type should look like. To disambiguate
2232 // ((A, B), C) and (A, B, C) we prefix the generic args with a _ and suffix
2233 // them with a Z. Ideally we wouldn't use Z, but not many special chars are
2234 // available for use in type names.
2235 write!(w, "C{}Tuple_", tuple.elems.len()).unwrap();
2236 write!(mangled_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2237 write!(mangled_tuple_type, "C{}Tuple_", tuple.elems.len()).unwrap();
2238 for elem in tuple.elems.iter() {
2239 if let syn::Type::Path(p) = elem {
2240 write_path!(p, Some(&mut mangled_tuple_type));
2241 } else if let syn::Type::Reference(refelem) = elem {
2242 if let syn::Type::Path(p) = &*refelem.elem {
2243 write_path!(p, Some(&mut mangled_tuple_type));
2244 } else { return false; }
2245 } else { return false; }
2247 write!(w, "Z").unwrap();
2248 write!(mangled_type, "Z").unwrap();
2249 write!(mangled_tuple_type, "Z").unwrap();
2250 if !self.check_create_container(String::from_utf8(mangled_tuple_type).unwrap(),
2251 &format!("{}Tuple", tuple.elems.len()), tuple.elems.iter().collect(), generics, is_ref) {
2255 } else if let syn::Type::Path(p_arg) = arg {
2256 write_path!(p_arg, None);
2257 } else if let syn::Type::Reference(refty) = arg {
2258 if let syn::Type::Path(p_arg) = &*refty.elem {
2259 write_path!(p_arg, None);
2260 } else if let syn::Type::Slice(_) = &*refty.elem {
2261 // write_c_type will actually do exactly what we want here, we just need to
2262 // make it a pointer so that its an option. Note that we cannot always convert
2263 // the Vec-as-slice (ie non-ref types) containers, so sometimes need to be able
2264 // to edit it, hence we use *mut here instead of *const.
2265 if args.len() != 1 { return false; }
2266 write!(w, "*mut ").unwrap();
2267 self.write_c_type(w, arg, None, true);
2268 } else { return false; }
2269 } else if let syn::Type::Array(a) = arg {
2270 if let syn::Type::Path(p_arg) = &*a.elem {
2271 let resolved = self.resolve_path(&p_arg.path, generics);
2272 if !self.is_primitive(&resolved) { return false; }
2273 if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Int(len), .. }) = &a.len {
2274 if self.c_type_from_path(&format!("[{}; {}]", resolved, len.base10_digits()), is_ref, ptr_for_ref).is_none() { return false; }
2275 write!(w, "_{}{}", resolved, len.base10_digits()).unwrap();
2276 write!(mangled_type, "_{}{}", resolved, len.base10_digits()).unwrap();
2277 } else { return false; }
2278 } else { return false; }
2279 } else { return false; }
2281 if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) { return true; }
2282 // Push the "end of type" Z
2283 write!(w, "Z").unwrap();
2284 write!(mangled_type, "Z").unwrap();
2286 // Make sure the type is actually defined:
2287 self.check_create_container(String::from_utf8(mangled_type).unwrap(), ident, args, generics, is_ref)
2289 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 {
2290 if !self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a)) {
2291 write!(w, "{}::", Self::generated_container_path()).unwrap();
2293 self.write_c_mangled_container_path_intern(w, args, generics, ident, is_ref, is_mut, ptr_for_ref, false)
2296 // **********************************
2297 // *** C Type Equivalent Printing ***
2298 // **********************************
2300 fn write_c_path_intern<W: std::io::Write>(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool) -> bool {
2301 let full_path = match self.maybe_resolve_path(&path, generics) {
2302 Some(path) => path, None => return false };
2303 if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) {
2304 write!(w, "{}", c_type).unwrap();
2306 } else if self.crate_types.traits.get(&full_path).is_some() {
2307 if is_ref && ptr_for_ref {
2308 write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap();
2310 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2312 write!(w, "crate::{}", full_path).unwrap();
2315 } else if self.crate_types.opaques.get(&full_path).is_some() || self.crate_types.mirrored_enums.get(&full_path).is_some() {
2316 if is_ref && ptr_for_ref {
2317 // ptr_for_ref implies we're returning the object, which we can't really do for
2318 // opaque or mirrored types without box'ing them, which is quite a waste, so return
2319 // the actual object itself (for opaque types we'll set the pointer to the actual
2320 // type and note that its a reference).
2321 write!(w, "crate::{}", full_path).unwrap();
2323 write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap();
2325 write!(w, "crate::{}", full_path).unwrap();
2332 fn write_c_type_intern<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool) -> bool {
2334 syn::Type::Path(p) => {
2335 if p.qself.is_some() {
2338 if let Some(full_path) = self.maybe_resolve_path(&p.path, generics) {
2339 if self.is_known_container(&full_path, is_ref) || self.is_path_transparent_container(&p.path, generics, is_ref) {
2340 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);
2342 if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() {
2343 return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref);
2346 self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref)
2348 syn::Type::Reference(r) => {
2349 self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref)
2351 syn::Type::Array(a) => {
2352 if is_ref && is_mut {
2353 write!(w, "*mut [").unwrap();
2354 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2356 write!(w, "*const [").unwrap();
2357 if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2359 let mut typecheck = Vec::new();
2360 if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref) { return false; }
2361 if typecheck[..] != ['u' as u8, '8' as u8] { return false; }
2363 if let syn::Expr::Lit(l) = &a.len {
2364 if let syn::Lit::Int(i) = &l.lit {
2366 if let Some(ty) = self.c_type_from_path(&format!("[u8; {}]", i.base10_digits()), false, ptr_for_ref) {
2367 write!(w, "{}", ty).unwrap();
2371 write!(w, "; {}]", i).unwrap();
2377 syn::Type::Slice(s) => {
2378 if !is_ref || is_mut { return false; }
2379 if let syn::Type::Path(p) = &*s.elem {
2380 let resolved = self.resolve_path(&p.path, generics);
2381 if self.is_primitive(&resolved) {
2382 write!(w, "{}::{}slice", Self::container_templ_path(), resolved).unwrap();
2385 } else if let syn::Type::Reference(r) = &*s.elem {
2386 if let syn::Type::Path(p) = &*r.elem {
2387 // Slices with "real types" inside are mapped as the equivalent non-ref Vec
2388 let resolved = self.resolve_path(&p.path, generics);
2389 let mangled_container = if let Some(ident) = self.crate_types.opaques.get(&resolved) {
2390 format!("CVec_{}Z", ident)
2391 } else if let Some(en) = self.crate_types.mirrored_enums.get(&resolved) {
2392 format!("CVec_{}Z", en.ident)
2393 } else if let Some(id) = p.path.get_ident() {
2394 format!("CVec_{}Z", id)
2395 } else { return false; };
2396 write!(w, "{}::{}", Self::generated_container_path(), mangled_container).unwrap();
2397 self.check_create_container(mangled_container, "Vec", vec![&*r.elem], generics, false)
2399 } else if let syn::Type::Tuple(_) = &*s.elem {
2400 let mut args = syn::punctuated::Punctuated::new();
2401 args.push(syn::GenericArgument::Type((*s.elem).clone()));
2402 let mut segments = syn::punctuated::Punctuated::new();
2403 segments.push(syn::PathSegment {
2404 ident: syn::Ident::new("Vec", Span::call_site()),
2405 arguments: syn::PathArguments::AngleBracketed(syn::AngleBracketedGenericArguments {
2406 colon2_token: None, lt_token: syn::Token![<](Span::call_site()), args, gt_token: syn::Token![>](Span::call_site()),
2409 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)
2412 syn::Type::Tuple(t) => {
2413 if t.elems.len() == 0 {
2416 self.write_c_mangled_container_path(w, t.elems.iter().collect(), generics,
2417 &format!("{}Tuple", t.elems.len()), is_ref, is_mut, ptr_for_ref)
2423 pub fn write_c_type<W: std::io::Write>(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) {
2424 assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref));
2426 pub fn understood_c_path(&self, p: &syn::Path) -> bool {
2427 if p.leading_colon.is_some() { return false; }
2428 self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false)
2430 pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool {
2431 self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false)