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Update repr parsing logic to handle multipel attrs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,176 +1,137 @@ | ||
| use proc_macro2::{Span, TokenStream}; | ||
| use quote::{quote, ToTokens, TokenStreamExt}; | ||
| use syn::{ | ||
| meta::ParseNestedMeta, parenthesized, spanned::Spanned, Error, LitInt, | ||
| }; | ||
| use quote::{quote, ToTokens}; | ||
| use syn::{parenthesized, token, Attribute, Error, Ident, LitInt}; | ||
|
|
||
| #[derive(Clone, Copy)] | ||
| pub enum IntRepr { | ||
| pub enum Primitive { | ||
| I8, | ||
| I16, | ||
| I32, | ||
| I64, | ||
| I128, | ||
| Isize, | ||
| U8, | ||
| U16, | ||
| U32, | ||
| U64, | ||
| U128, | ||
| Usize, | ||
| } | ||
|
|
||
| impl ToTokens for IntRepr { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| impl Primitive { | ||
| const ALL: [Self; 10] = [ | ||
| Self::I8, | ||
| Self::I16, | ||
| Self::I32, | ||
| Self::I64, | ||
| Self::Isize, | ||
| Self::U8, | ||
| Self::U16, | ||
| Self::U32, | ||
| Self::U64, | ||
| Self::Usize, | ||
| ]; | ||
|
|
||
| pub const fn as_str(&self) -> &'static str { | ||
| match self { | ||
| Self::I8 => tokens.append_all(quote! { i8 }), | ||
| Self::I16 => tokens.append_all(quote! { i16 }), | ||
| Self::I32 => tokens.append_all(quote! { i32 }), | ||
| Self::I64 => tokens.append_all(quote! { i64 }), | ||
| Self::I128 => tokens.append_all(quote! { i128 }), | ||
| Self::U8 => tokens.append_all(quote! { u8 }), | ||
| Self::U16 => tokens.append_all(quote! { u16 }), | ||
| Self::U32 => tokens.append_all(quote! { u32 }), | ||
| Self::U64 => tokens.append_all(quote! { u64 }), | ||
| Self::U128 => tokens.append_all(quote! { u128 }), | ||
| Self::I8 => "i8", | ||
| Self::I16 => "i16", | ||
| Self::I32 => "i32", | ||
| Self::I64 => "i64", | ||
| Self::Isize => "isize", | ||
| Self::U8 => "u8", | ||
| Self::U16 => "u16", | ||
| Self::U32 => "u32", | ||
| Self::U64 => "u64", | ||
| Self::Usize => "usize", | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone, Copy)] | ||
| pub enum BaseRepr { | ||
| C, | ||
| // structs only | ||
| Transparent, | ||
| // enums only | ||
| Int(IntRepr), | ||
| } | ||
|
|
||
| impl ToTokens for BaseRepr { | ||
| impl ToTokens for Primitive { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| match self { | ||
| BaseRepr::C => tokens.append_all(quote! { C }), | ||
| BaseRepr::Transparent => tokens.append_all(quote! { transparent }), | ||
| BaseRepr::Int(int_repr) => tokens.append_all(quote! { #int_repr }), | ||
| } | ||
| let ident = Ident::new(self.as_str(), Span::call_site()); | ||
| tokens.extend(quote! { #ident }); | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone)] | ||
| pub enum Modifier { | ||
| // structs only | ||
| Packed, | ||
| Align(LitInt), | ||
| Packed(#[allow(dead_code)] usize), | ||
| Align(#[allow(dead_code)] usize), | ||
| } | ||
|
|
||
| impl ToTokens for Modifier { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| match self { | ||
| Modifier::Packed => tokens.append_all(quote! { packed }), | ||
| Modifier::Align(n) => tokens.append_all(quote! { align(#n) }), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone, Default)] | ||
| pub struct Repr { | ||
| pub base_repr: Option<(BaseRepr, Span)>, | ||
| pub modifier: Option<(Modifier, Span)>, | ||
| pub enum Repr { | ||
| Transparent, | ||
| Primitive(Primitive), | ||
| C { | ||
| #[allow(dead_code)] | ||
| primitive: Option<Primitive>, | ||
| #[allow(dead_code)] | ||
| modifier: Option<Modifier>, | ||
| }, | ||
| Rust { | ||
| #[allow(dead_code)] | ||
| modifier: Option<Modifier>, | ||
| }, | ||
| } | ||
|
|
||
| impl Repr { | ||
| fn try_set_modifier<S: ToTokens>( | ||
| &mut self, | ||
| modifier: Modifier, | ||
| spanned: S, | ||
| ) -> Result<(), Error> { | ||
| if self.modifier.is_some() { | ||
| Err(Error::new_spanned( | ||
| spanned, | ||
| "only one repr modifier may be specified", | ||
| )) | ||
| } else { | ||
| self.modifier = Some((modifier, spanned.span())); | ||
| Ok(()) | ||
| pub fn from_attrs(attrs: &[Attribute]) -> Result<Self, Error> { | ||
| let mut c = false; | ||
| let mut transparent = false; | ||
| let mut primitive = None; | ||
| let mut modifier = None; | ||
|
|
||
| for attr in attrs.iter().filter(|a| a.meta.path().is_ident("repr")) { | ||
| attr.parse_nested_meta(|meta| { | ||
| if meta.path.is_ident("C") { | ||
| c = true; | ||
| Ok(()) | ||
| } else if meta.path.is_ident("transparent") { | ||
| transparent = true; | ||
| Ok(()) | ||
| } else if let Some(&p) = Primitive::ALL | ||
| .iter() | ||
| .find(|p| meta.path.is_ident(p.as_str())) | ||
| { | ||
| primitive = Some(p); | ||
| Ok(()) | ||
| } else if meta.path.is_ident("align") { | ||
| let content; | ||
| parenthesized!(content in meta.input); | ||
| let lit = content.parse::<LitInt>()?; | ||
| let n = lit.base10_parse()?; | ||
| modifier = Some(Modifier::Align(n)); | ||
| Ok(()) | ||
| } else if meta.path.is_ident("packed") { | ||
| if meta.input.peek(token::Paren) { | ||
| let content; | ||
| parenthesized!(content in meta.input); | ||
| let lit = content.parse::<LitInt>()?; | ||
| let n = lit.base10_parse()?; | ||
| modifier = Some(Modifier::Packed(n)); | ||
| } else { | ||
| modifier = Some(Modifier::Packed(1)); | ||
| } | ||
| Ok(()) | ||
| } else { | ||
| Err(Error::new_spanned( | ||
| meta.path, | ||
| "unrecognized repr argument", | ||
| )) | ||
| } | ||
| })?; | ||
| } | ||
| } | ||
|
|
||
| fn try_set_base_repr<S: ToTokens>( | ||
| &mut self, | ||
| repr: BaseRepr, | ||
| spanned: S, | ||
| ) -> Result<(), Error> { | ||
| if self.base_repr.is_some() { | ||
| Err(Error::new_spanned( | ||
| spanned, | ||
| "only one repr may be specified", | ||
| )) | ||
| if c { | ||
| Ok(Repr::C { | ||
| primitive, | ||
| modifier, | ||
| }) | ||
| } else if transparent { | ||
| Ok(Repr::Transparent) | ||
| } else if let Some(primitive) = primitive { | ||
| Ok(Repr::Primitive(primitive)) | ||
| } else { | ||
| self.base_repr = Some((repr, spanned.span())); | ||
| Ok(()) | ||
| Ok(Repr::Rust { modifier }) | ||
| } | ||
| } | ||
|
|
||
| pub fn parse_list_meta( | ||
| &mut self, | ||
| meta: ParseNestedMeta<'_>, | ||
| ) -> Result<(), Error> { | ||
| if meta.path.is_ident("packed") { | ||
| return self.try_set_modifier(Modifier::Packed, meta.path); | ||
| } else if meta.path.is_ident("align") { | ||
| let content; | ||
| parenthesized!(content in meta.input); | ||
| let alignment = content.parse()?; | ||
|
|
||
| if !content.is_empty() { | ||
| return Err(content.error("align requires only one argument")); | ||
| } | ||
|
|
||
| return self | ||
| .try_set_modifier(Modifier::Align(alignment), meta.path); | ||
| } | ||
|
|
||
| let parsed_repr = if meta.path.is_ident("transparent") { | ||
| BaseRepr::Transparent | ||
| } else if meta.path.is_ident("C") { | ||
| BaseRepr::C | ||
| } else if meta.path.is_ident("i8") { | ||
| BaseRepr::Int(IntRepr::I8) | ||
| } else if meta.path.is_ident("i16") { | ||
| BaseRepr::Int(IntRepr::I16) | ||
| } else if meta.path.is_ident("i32") { | ||
| BaseRepr::Int(IntRepr::I32) | ||
| } else if meta.path.is_ident("i64") { | ||
| BaseRepr::Int(IntRepr::I64) | ||
| } else if meta.path.is_ident("i128") { | ||
| BaseRepr::Int(IntRepr::I128) | ||
| } else if meta.path.is_ident("u8") { | ||
| BaseRepr::Int(IntRepr::U8) | ||
| } else if meta.path.is_ident("u16") { | ||
| BaseRepr::Int(IntRepr::U16) | ||
| } else if meta.path.is_ident("u32") { | ||
| BaseRepr::Int(IntRepr::U32) | ||
| } else if meta.path.is_ident("u64") { | ||
| BaseRepr::Int(IntRepr::U64) | ||
| } else if meta.path.is_ident("u128") { | ||
| BaseRepr::Int(IntRepr::U128) | ||
| } else { | ||
| let msg = | ||
| "invalid repr, available reprs are transparent, C, i* and u*"; | ||
|
|
||
| return Err(Error::new_spanned(meta.path, msg)); | ||
| }; | ||
|
|
||
| self.try_set_base_repr(parsed_repr, meta.path) | ||
| } | ||
| } | ||
|
|
||
| impl ToTokens for Repr { | ||
| fn to_tokens(&self, tokens: &mut TokenStream) { | ||
| let base_repr = self.base_repr.as_ref().map(|(b, _)| b); | ||
| let base_repr_iter = base_repr.iter(); | ||
| let modifier = self.modifier.as_ref().map(|(m, _)| m); | ||
| let modifier_iter = modifier.iter(); | ||
| tokens.append_all( | ||
| quote! { #[repr(#(#base_repr_iter,)* #(#modifier_iter,)*)] }, | ||
| ); | ||
| } | ||
| } |