From d25cffee0dfb879d827717d4d90a1b4d184eed0a Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Thu, 23 Sep 2021 20:02:20 +0000 Subject: [PATCH] Stop tracking unused syn::Type mappings in GenericResolver They are now unused as of the previous commit --- c-bindings-gen/src/main.rs | 4 +-- c-bindings-gen/src/types.rs | 57 +++++++++++++++++++------------------ 2 files changed, 31 insertions(+), 30 deletions(-) diff --git a/c-bindings-gen/src/main.rs b/c-bindings-gen/src/main.rs index 8e3962d..46ae0e7 100644 --- a/c-bindings-gen/src/main.rs +++ b/c-bindings-gen/src/main.rs @@ -646,7 +646,7 @@ fn writeln_struct<'a, 'b, W: std::io::Write>(w: &mut W, s: &'a syn::ItemStruct, let mut self_path_segs = syn::punctuated::Punctuated::new(); self_path_segs.push(s.ident.clone().into()); let self_path = syn::Path { leading_colon: None, segments: self_path_segs}; - let mut gen_types = GenericTypes::new(Some((types.resolve_path(&self_path, None), &self_path))); + let mut gen_types = GenericTypes::new(Some(types.resolve_path(&self_path, None))); assert!(gen_types.learn_generics(&s.generics, types)); let mut all_fields_settable = true; @@ -769,7 +769,7 @@ fn writeln_impl(w: &mut W, i: &syn::ItemImpl, types: &mut Typ if p.qself.is_some() { unimplemented!(); } if let Some(ident) = single_ident_generic_path_to_ident(&p.path) { if let Some(resolved_path) = types.maybe_resolve_non_ignored_ident(&ident) { - let mut gen_types = GenericTypes::new(Some((resolved_path.clone(), &p.path))); + let mut gen_types = GenericTypes::new(Some(resolved_path.clone())); if !gen_types.learn_generics(&i.generics, types) { eprintln!("Not implementing anything for impl {} due to not understood generics", ident); return; diff --git a/c-bindings-gen/src/types.rs b/c-bindings-gen/src/types.rs index 50800bb..8063532 100644 --- a/c-bindings-gen/src/types.rs +++ b/c-bindings-gen/src/types.rs @@ -173,13 +173,13 @@ pub fn is_enum_opaque(e: &syn::ItemEnum) -> bool { /// concrete C container struct, etc). #[must_use] pub struct GenericTypes<'a, 'b> { - self_ty: Option<(String, &'a syn::Path)>, + self_ty: Option, parent: Option<&'b GenericTypes<'b, 'b>>, - typed_generics: HashMap<&'a syn::Ident, (String, Option<&'a syn::Path>)>, + typed_generics: HashMap<&'a syn::Ident, String>, default_generics: HashMap<&'a syn::Ident, (syn::Type, syn::Type)>, } impl<'a, 'p: 'a> GenericTypes<'a, 'p> { - pub fn new(self_ty: Option<(String, &'a syn::Path)>) -> Self { + pub fn new(self_ty: Option) -> Self { Self { self_ty, parent: None, typed_generics: HashMap::new(), default_generics: HashMap::new(), } } @@ -192,6 +192,7 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { /// Learn the generics in generics in the current context, given a TypeResolver. pub fn learn_generics<'b, 'c>(&mut self, generics: &'a syn::Generics, types: &'b TypeResolver<'a, 'c>) -> bool { + let mut new_typed_generics = HashMap::new(); // First learn simple generics... for generic in generics.params.iter() { match generic { @@ -210,8 +211,8 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { if path == "Sized" { continue; } if non_lifetimes_processed { return false; } non_lifetimes_processed = true; - let new_ident = if path != "std::ops::Deref" && path != "core::ops::Deref" { - Some(&trait_bound.path) + if path != "std::ops::Deref" && path != "core::ops::Deref" { + new_typed_generics.insert(&type_param.ident, Some(path)); } else if trait_bound.path.segments.len() == 1 { // If we're templated on Deref, store // the reference type in `default_generics` which handles full @@ -230,11 +231,11 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { _ => unimplemented!(), } } - None - } else { None } - } else { None }; - self.typed_generics.insert(&type_param.ident, (path, new_ident)); - } else { return false; } + } else { + new_typed_generics.insert(&type_param.ident, None); + } + } + } } } if let Some(default) = type_param.default.as_ref() { @@ -253,9 +254,9 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { if p.qself.is_some() { return false; } if p.path.leading_colon.is_some() { return false; } let mut p_iter = p.path.segments.iter(); - if let Some(gen) = self.typed_generics.get_mut(&p_iter.next().unwrap().ident) { - if gen.0 != "std::ops::Deref" && gen.0 != "core::ops::Deref" { return false; } - if &format!("{}", p_iter.next().unwrap().ident) != "Target" { return false; } + if let Some(gen) = new_typed_generics.get_mut(&p_iter.next().unwrap().ident) { + if gen.is_some() { return false; } + if &format!("{}", p_iter.next().unwrap().ident) != "Target" {return false; } let mut non_lifetimes_processed = false; for bound in t.bounds.iter() { @@ -266,8 +267,7 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { if non_lifetimes_processed { return false; } non_lifetimes_processed = true; assert_simple_bound(&trait_bound); - *gen = (types.resolve_path(&trait_bound.path, None), - Some(&trait_bound.path)); + *gen = Some(types.resolve_path(&trait_bound.path, None)); } } } else { return false; } @@ -275,8 +275,10 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { } } } - for (_, (_, ident)) in self.typed_generics.iter() { - if ident.is_none() { return false; } + for (key, value) in new_typed_generics.drain() { + if let Some(v) = value { + assert!(self.typed_generics.insert(key, v).is_none()); + } else { return false; } } true } @@ -297,10 +299,9 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { // implement Deref for relevant types). We don't // bother to implement it for associated types, however, so we just // ignore such bounds. - let new_ident = if path != "std::ops::Deref" && path != "core::ops::Deref" { - Some(&tr.path) - } else { None }; - self.typed_generics.insert(&t.ident, (path, new_ident)); + if path != "std::ops::Deref" && path != "core::ops::Deref" { + self.typed_generics.insert(&t.ident, path); + } } else { unimplemented!(); } }, _ => unimplemented!(), @@ -316,10 +317,10 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { pub fn maybe_resolve_ident<'b>(&'b self, ident: &syn::Ident) -> Option<&'b String> { if let Some(ty) = &self.self_ty { if format!("{}", ident) == "Self" { - return Some(&ty.0); + return Some(&ty); } } - if let Some(res) = self.typed_generics.get(ident).map(|(a, _)| a) { + if let Some(res) = self.typed_generics.get(ident) { return Some(res); } if let Some(parent) = self.parent { @@ -331,14 +332,14 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { /// Attempt to resolve a Path as a generic parameter and return the full path. as both a string /// and syn::Path. - pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<(&'b String, &'a syn::Path)> { + pub fn maybe_resolve_path<'b>(&'b self, path: &syn::Path) -> Option<&'b String> { if let Some(ident) = path.get_ident() { if let Some(ty) = &self.self_ty { if format!("{}", ident) == "Self" { - return Some((&ty.0, ty.1)); + return Some(&ty); } } - if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) { + if let Some(res) = self.typed_generics.get(ident) { return Some(res); } } else { @@ -347,7 +348,7 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { let mut it = path.segments.iter(); if path.segments.len() == 2 && format!("{}", it.next().unwrap().ident) == "Self" { let ident = &it.next().unwrap().ident; - if let Some(res) = self.typed_generics.get(ident).map(|(a, b)| (a, b.unwrap())) { + if let Some(res) = self.typed_generics.get(ident) { return Some(res); } } @@ -581,7 +582,7 @@ impl<'mod_lifetime, 'crate_lft: 'mod_lifetime> ImportResolver<'mod_lifetime, 'cr pub fn maybe_resolve_path(&self, p: &syn::Path, generics: Option<&GenericTypes>) -> Option { if let Some(gen_types) = generics { - if let Some((resp, _)) = gen_types.maybe_resolve_path(p) { + if let Some(resp) = gen_types.maybe_resolve_path(p) { return Some(resp.clone()); } } -- 2.30.2