From 18dc4eff64fcad567e67dfe11c501a9b4ec7633e Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Sun, 31 Oct 2021 18:06:42 +0000 Subject: [PATCH] Support printing impl generics without an immediate bound (e.g. if you have `fn ... where A: Trait` we'd not have printed ``) This further supports printing impl generics with a reference to a struct (not a trait), which we concretize with a regular reference. --- c-bindings-gen/src/blocks.rs | 14 ++------ c-bindings-gen/src/types.rs | 63 ++++++++++++++++-------------------- 2 files changed, 31 insertions(+), 46 deletions(-) diff --git a/c-bindings-gen/src/blocks.rs b/c-bindings-gen/src/blocks.rs index b214445..e48a98a 100644 --- a/c-bindings-gen/src/blocks.rs +++ b/c-bindings-gen/src/blocks.rs @@ -733,17 +733,9 @@ pub fn maybe_write_generics(w: &mut W, generics: &syn::Generi for (idx, generic) in generics.params.iter().enumerate() { match generic { syn::GenericParam::Type(type_param) => { - let mut printed_param = false; - for bound in type_param.bounds.iter() { - if let syn::TypeParamBound::Trait(trait_bound) = bound { - assert_simple_bound(&trait_bound); - write!(w, "{}crate::{}", if idx != 0 { ", " } else { "" }, gen_types.maybe_resolve_ident(&type_param.ident).unwrap()).unwrap(); - if printed_param { - unimplemented!("Can't print generic params that have multiple non-lifetime bounds"); - } - printed_param = true; - } - } + write!(w, "{}", if idx != 0 { ", " } else { "" }).unwrap(); + let type_ident = &type_param.ident; + types.write_c_type_in_generic_param(w, &syn::parse_quote!(#type_ident), Some(&gen_types), false); }, syn::GenericParam::Lifetime(lt) => { if concrete_lifetimes { diff --git a/c-bindings-gen/src/types.rs b/c-bindings-gen/src/types.rs index 7f53019..224b3ec 100644 --- a/c-bindings-gen/src/types.rs +++ b/c-bindings-gen/src/types.rs @@ -313,23 +313,6 @@ impl<'a, 'p: 'a> GenericTypes<'a, 'p> { } } - /// Attempt to resolve an Ident as a generic parameter and return the full path. - 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); - } - } - if let Some(res) = self.typed_generics.get(ident) { - return Some(res); - } - if let Some(parent) = self.parent { - parent.maybe_resolve_ident(ident) - } else { - None - } - } - /// 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> { @@ -2343,7 +2326,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { if let syn::Type::Reference(r_arg) = t { assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners - if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false) { return false; } + if !self.write_c_type_intern(w, &*r_arg.elem, generics, false, false, false, false) { return false; } // While write_c_type_intern, above is correct, we don't want to blindly convert a // reference to something stupid, so check that the container is either opaque or a @@ -2361,10 +2344,10 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { } else { assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners } - if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; } + if !self.write_c_type_intern(w, t, generics, false, false, false, false) { return false; } } else { assert!(!is_ref); // We don't currently support outer reference types for non-primitive inners - if !self.write_c_type_intern(w, t, generics, false, false, false) { return false; } + if !self.write_c_type_intern(w, t, generics, false, false, false, false) { return false; } } } true @@ -2463,13 +2446,13 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { if self.is_transparent_container(ident, is_ref, args.iter().map(|a| *a), generics) { if !in_type { if self.c_type_has_inner_from_path(&subtype) { - if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref) { return false; } + if !self.write_c_path_intern(w, &$p_arg.path, generics, is_ref, is_mut, ptr_for_ref, false) { return false; } } else { if let Some(arr_ty) = self.is_real_type_array(&subtype) { - if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false) { return false; } + if !self.write_c_type_intern(w, &arr_ty, generics, false, true, false, false) { return false; } } else { // Option needs to be converted to a *mut T, ie mut ptr-for-ref - if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true) { return false; } + if !self.write_c_path_intern(w, &$p_arg.path, generics, true, true, true, false) { return false; } } } } else { @@ -2586,7 +2569,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { // *** C Type Equivalent Printing *** // ********************************** - fn write_c_path_intern(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool) -> bool { + fn write_c_path_intern(&self, w: &mut W, path: &syn::Path, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool) -> bool { let full_path = match self.maybe_resolve_path(&path, generics) { Some(path) => path, None => return false }; if let Some(c_type) = self.c_type_from_path(&full_path, is_ref, ptr_for_ref) { @@ -2596,6 +2579,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { if is_ref && ptr_for_ref { write!(w, "*{} crate::{}", if is_mut { "mut" } else { "const" }, full_path).unwrap(); } else if is_ref { + if with_ref_lifetime { unimplemented!(); } write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap(); } else { write!(w, "crate::{}", full_path).unwrap(); @@ -2608,6 +2592,12 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { // the actual object itself (for opaque types we'll set the pointer to the actual // type and note that its a reference). write!(w, "crate::{}", full_path).unwrap(); + } else if is_ref && with_ref_lifetime { + assert!(!is_mut); + // If we're concretizing something with a lifetime parameter, we have to pick a + // lifetime, of which the only real available choice is `static`, obviously. + write!(w, "&'static ").unwrap(); + self.write_rust_path(w, generics, path); } else if is_ref { write!(w, "&{}crate::{}", if is_mut { "mut " } else { "" }, full_path).unwrap(); } else { @@ -2618,7 +2608,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { false } } - fn write_c_type_intern(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool) -> bool { + fn write_c_type_intern(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, is_ref: bool, is_mut: bool, ptr_for_ref: bool, with_ref_lifetime: bool) -> bool { match generics.resolve_type(t) { syn::Type::Path(p) => { if p.qself.is_some() { @@ -2629,24 +2619,24 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { 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); } if let Some(aliased_type) = self.crate_types.type_aliases.get(&full_path).cloned() { - return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref); + return self.write_c_type_intern(w, &aliased_type, None, is_ref, is_mut, ptr_for_ref, with_ref_lifetime); } } - self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref) + self.write_c_path_intern(w, &p.path, generics, is_ref, is_mut, ptr_for_ref, with_ref_lifetime) }, syn::Type::Reference(r) => { - self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref) + self.write_c_type_intern(w, &*r.elem, generics, true, r.mutability.is_some(), ptr_for_ref, with_ref_lifetime) }, syn::Type::Array(a) => { if is_ref && is_mut { write!(w, "*mut [").unwrap(); - if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; } + if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; } } else if is_ref { write!(w, "*const [").unwrap(); - if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref) { return false; } + if !self.write_c_type_intern(w, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; } } else { let mut typecheck = Vec::new(); - if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref) { return false; } + if !self.write_c_type_intern(&mut typecheck, &a.elem, generics, false, false, ptr_for_ref, with_ref_lifetime) { return false; } if typecheck[..] != ['u' as u8, '8' as u8] { return false; } } if let syn::Expr::Lit(l) = &a.len { @@ -2704,7 +2694,7 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { args.push(syn::GenericArgument::Type((*s.elem).clone())); let mut segments = syn::punctuated::Punctuated::new(); segments.push(parse_quote!(Vec<#args>)); - 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) + self.write_c_type_intern(w, &syn::Type::Path(syn::TypePath { qself: None, path: syn::Path { leading_colon: None, segments } }), generics, false, is_mut, ptr_for_ref, with_ref_lifetime) } else { false } }, syn::Type::Tuple(t) => { @@ -2719,13 +2709,16 @@ impl<'a, 'c: 'a> TypeResolver<'a, 'c> { } } pub fn write_c_type(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) { - assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref)); + assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, false)); + } + pub fn write_c_type_in_generic_param(&self, w: &mut W, t: &syn::Type, generics: Option<&GenericTypes>, ptr_for_ref: bool) { + assert!(self.write_c_type_intern(w, t, generics, false, false, ptr_for_ref, true)); } pub fn understood_c_path(&self, p: &syn::Path) -> bool { if p.leading_colon.is_some() { return false; } - self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false) + self.write_c_path_intern(&mut std::io::sink(), p, None, false, false, false, false) } pub fn understood_c_type(&self, t: &syn::Type, generics: Option<&GenericTypes>) -> bool { - self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false) + self.write_c_type_intern(&mut std::io::sink(), t, generics, false, false, false, false) } } -- 2.30.2