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chore: 将工具链更新到2024-07-23 (#864)

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* chore: 将工具链更新到2024-07-23
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LoGin
2024-07-25 00:55:02 +08:00
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parent 634349e0eb
commit bd70d2d1f4
150 changed files with 237 additions and 200 deletions
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23
kernel/crates/intertrait/macros/Cargo.toml Normal file
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[package]
name = "intertrait-macros"
description = "Macros for intertrait crate, which allows for direct casting between trait objects"
version = "0.2.2"
authors = ["CodeChain Team <hi@codechain.io>"]
license = "GPLv2(for code modified by dragonos) MIT OR Apache-2.0"
edition = "2018"
repository = "https://github.com/CodeChain-io/intertrait"
include = ["src/**/*", "Cargo.toml", "LICENSE-*"]
[lib]
proc-macro = true
[dependencies]
hashbrown = "0.13.2"
proc-macro2 = "1.0"
syn = { version = "1.0", features = ["full"] }
quote = "1.0"
uuid = { version = "0.8", features = ["v4"] }
[dev-dependencies]
intertrait = { version = "=0.2.2", path = ".." }
linkme = "=0.3.27"

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kernel/crates/intertrait/macros/LICENSE-MIT Normal file
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kernel/crates/intertrait/macros/src/args.rs Normal file
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use hashbrown::HashSet;
use syn::bracketed;
use syn::parse::{Parse, ParseStream, Result};
use syn::punctuated::Punctuated;
use syn::{Error, Ident, Path, Token, Type};
#[derive(Hash, PartialEq, Eq)]
pub enum Flag {
Sync,
}
impl Flag {
fn from(ident: &Ident) -> Result<Self> {
match ident.to_string().as_str() {
"sync" => Ok(Flag::Sync),
unknown => {
let msg = format!("Unknown flag: {}", unknown);
Err(Error::new_spanned(ident, msg))
}
}
}
}
pub struct Targets {
pub flags: HashSet<Flag>,
pub paths: Vec<Path>,
}
impl Parse for Targets {
fn parse(input: ParseStream) -> Result<Self> {
let mut flags = HashSet::new();
let mut paths = Vec::new();
if input.is_empty() {
return Ok(Targets { flags, paths });
}
if input.peek(syn::token::Bracket) {
let content;
bracketed!(content in input);
for ident in Punctuated::<Ident, Token![,]>::parse_terminated(&content)? {
if !flags.insert(Flag::from(&ident)?) {
let msg = format!("Duplicated flag: {}", ident);
return Err(Error::new_spanned(ident, msg));
}
}
}
if input.is_empty() {
return Ok(Targets { flags, paths });
}
paths = Punctuated::<Path, Token![,]>::parse_terminated(input)?
.into_iter()
.collect();
Ok(Targets { flags, paths })
}
}
pub struct Casts {
pub ty: Type,
pub targets: Targets,
}
impl Parse for Casts {
fn parse(input: ParseStream) -> Result<Self> {
let ty: Type = input.parse()?;
input.parse::<Token![=>]>()?;
Ok(Casts {
ty,
targets: input.parse()?,
})
}
}

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kernel/crates/intertrait/macros/src/gen_caster.rs Normal file
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use core::str::from_utf8_unchecked;
use proc_macro2::TokenStream;
use uuid::adapter::Simple;
use uuid::Uuid;
use quote::format_ident;
use quote::quote;
use quote::ToTokens;
pub fn generate_caster(ty: &impl ToTokens, trait_: &impl ToTokens, sync: bool) -> TokenStream {
let mut fn_buf = [0u8; FN_BUF_LEN];
let fn_ident = format_ident!("{}", new_fn_name(&mut fn_buf));
// 生成从dyn trait转换为具体类型结构体ty的caster
let new_caster = if sync {
quote! {
::intertrait::Caster::<dyn #trait_>::new_sync(
|from| from.downcast_ref::<#ty>().unwrap(),
|from| from.downcast_mut::<#ty>().unwrap(),
|from| from.downcast::<#ty>().unwrap(),
|from| from.downcast::<#ty>().unwrap(),
|from| from.downcast::<#ty>().unwrap()
)
}
} else {
quote! {
::intertrait::Caster::<dyn #trait_>::new(
|from| from.downcast_ref::<#ty>().unwrap(),
|from| from.downcast_mut::<#ty>().unwrap(),
|from| from.downcast::<#ty>().unwrap(),
|from| from.downcast::<#ty>().unwrap(),
)
}
};
// 由于过程宏是在预编译期执行的，这里的target_os是linux。
// 编译完成的proc macro会交给下一阶段进行编译，因此，#[cfg(target_os)]会在下一阶段生效。
// 我们必须在预处理阶段把两种代码的token stream都生成出来，然后在下一阶段选择性地使用其中一种。
quote! {
#[cfg(not(target_os = "none"))]
#[::linkme::distributed_slice(::intertrait::CASTERS)]
fn #fn_ident() -> (::std::any::TypeId, ::intertrait::BoxedCaster) {
(::std::any::TypeId::of::<#ty>(), Box::new(#new_caster))
}
#[cfg(target_os = "none")]
#[::linkme::distributed_slice(::intertrait::CASTERS)]
fn #fn_ident() -> (::core::any::TypeId, ::intertrait::BoxedCaster) {
(::core::any::TypeId::of::<#ty>(), alloc::boxed::Box::new(#new_caster))
}
}
}
const FN_PREFIX: &[u8] = b"__";
const FN_BUF_LEN: usize = FN_PREFIX.len() + Simple::LENGTH;
fn new_fn_name(buf: &mut [u8]) -> &str {
buf[..FN_PREFIX.len()].copy_from_slice(FN_PREFIX);
Uuid::new_v4()
.to_simple()
.encode_lower(&mut buf[FN_PREFIX.len()..]);
unsafe { from_utf8_unchecked(&buf[..FN_BUF_LEN]) }
}

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use hashbrown::HashSet;
use proc_macro2::TokenStream;
use quote::{quote, quote_spanned, ToTokens};
use syn::punctuated::Punctuated;
use syn::spanned::Spanned;
use syn::Token;
use syn::{
AngleBracketedGenericArguments, Binding, GenericArgument, ImplItem, ItemImpl, Path,
PathArguments,
};
use PathArguments::AngleBracketed;
use crate::args::Flag;
use crate::gen_caster::generate_caster;
pub fn process(flags: &HashSet<Flag>, input: ItemImpl) -> TokenStream {
let ItemImpl {
ref self_ty,
ref trait_,
ref items,
..
} = input;
let generated = match trait_ {
None => quote_spanned! {
self_ty.span() => compile_error!("#[cast_to] should only be on an impl of a trait");
},
Some(trait_) => match trait_ {
(Some(bang), _, _) => quote_spanned! {
bang.span() => compile_error!("#[cast_to] is not for !Trait impl");
},
(None, path, _) => {
let path = fully_bound_trait(path, items);
generate_caster(self_ty, &path, flags.contains(&Flag::Sync))
}
},
};
quote! {
#input
#generated
}
}
fn fully_bound_trait(path: &Path, items: &[ImplItem]) -> impl ToTokens {
let bindings = items
.iter()
.filter_map(|item| {
if let ImplItem::Type(assoc_ty) = item {
Some(GenericArgument::Binding(Binding {
ident: assoc_ty.ident.to_owned(),
eq_token: Default::default(),
ty: assoc_ty.ty.to_owned(),
}))
} else {
None
}
})
.collect::<Punctuated<_, Token![,]>>();
let mut path = path.clone();
if bindings.is_empty() {
return path;
}
if let Some(last) = path.segments.last_mut() {
match &mut last.arguments {
PathArguments::None => {
last.arguments = AngleBracketed(AngleBracketedGenericArguments {
colon2_token: None,
lt_token: Default::default(),
args: bindings,
gt_token: Default::default(),
})
}
AngleBracketed(args) => args.args.extend(bindings),
_ => {}
}
}
path
}

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kernel/crates/intertrait/macros/src/item_type.rs Normal file
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use hashbrown::HashSet;
use proc_macro2::TokenStream;
use syn::spanned::Spanned;
use syn::{DeriveInput, Path};
use quote::{quote, quote_spanned};
use crate::args::Flag;
use crate::gen_caster::generate_caster;
pub fn process(flags: &HashSet<Flag>, paths: Vec<Path>, input: DeriveInput) -> TokenStream {
let DeriveInput {
ref ident,
ref generics,
..
} = input;
let generated = if generics.lt_token.is_some() {
quote_spanned! {
generics.span() => compile_error!("#[cast_to(..)] can't be used on a generic type definition");
}
} else {
paths
.into_iter()
.flat_map(|t| generate_caster(ident, &t, flags.contains(&Flag::Sync)))
.collect()
};
quote! {
#input
#generated
}
}

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extern crate proc_macro;
use proc_macro::TokenStream;
use syn::{parse, parse_macro_input, DeriveInput, ItemImpl};
use args::{Casts, Flag, Targets};
use gen_caster::generate_caster;
mod args;
mod gen_caster;
mod item_impl;
mod item_type;
/// Attached on an `impl` item or type definition, registers traits as targets for casting.
///
/// If on an `impl` item, no argument is allowed. But on a type definition, the target traits
/// must be listed explicitly.
///
/// Add `[sync]` before the list of traits if the underlying type is `Sync + Send` and you
/// need `std::sync::Arc`.
///
/// # Examples
/// ## On a trait impl
/// ```
/// use intertrait::*;
///
/// struct Data;
///
/// trait Greet {
/// fn greet(&self);
/// }
///
/// // Greet can be cast into from any sub-trait of CastFrom implemented by Data.
/// #[cast_to]
/// impl Greet for Data {
/// fn greet(&self) {
/// println!("Hello");
/// }
/// }
/// ```
///
/// ## On a type definition
/// Use when a target trait is derived or implemented in an external crate.
/// ```
/// use intertrait::*;
///
/// // Debug can be cast into from any sub-trait of CastFrom implemented by Data
/// #[cast_to(std::fmt::Debug)]
/// #[derive(std::fmt::Debug)]
/// struct Data;
/// ```
///
/// ## For Arc
/// Use when the underlying type is `Sync + Send` and you want to use `Arc`.
/// ```
/// use intertrait::*;
///
/// // Debug can be cast into from any sub-trait of CastFrom implemented by Data
/// #[cast_to([sync] std::fmt::Debug)]
/// #[derive(std::fmt::Debug)]
/// struct Data;
/// ```
#[proc_macro_attribute]
pub fn cast_to(args: TokenStream, input: TokenStream) -> TokenStream {
match parse::<Targets>(args) {
Ok(Targets { flags, paths }) => {
if paths.is_empty() {
item_impl::process(&flags, parse_macro_input!(input as ItemImpl))
} else {
item_type::process(&flags, paths, parse_macro_input!(input as DeriveInput))
}
}
Err(err) => vec![err.to_compile_error(), input.into()]
.into_iter()
.collect(),
}
.into()
}
/// Declares target traits for casting implemented by a type.
///
/// This macro is for registering both a concrete type and its traits to be targets for casting.
/// Useful when the type definition and the trait implementations are in an external crate.
///
/// **Note**: this macro cannot be used in an expression or statement prior to Rust 1.45.0,
/// due to [a previous limitation](https://github.com/rust-lang/rust/pull/68717).
/// If you want to use it in an expression or statement, use Rust 1.45.0 or later.
///
/// # Examples
/// ```
/// use intertrait::*;
///
/// #[derive(std::fmt::Debug)]
/// enum Data {
/// A, B, C
/// }
/// trait Greet {
/// fn greet(&self);
/// }
/// impl Greet for Data {
/// fn greet(&self) {
/// println!("Hello");
/// }
/// }
///
/// castable_to! { Data => std::fmt::Debug, Greet }
///
/// # fn main() {}
/// ```
///
/// When the type is `Sync + Send` and is used with `Arc`:
/// ```
/// use intertrait::*;
///
/// #[derive(std::fmt::Debug)]
/// enum Data {
/// A, B, C
/// }
/// trait Greet {
/// fn greet(&self);
/// }
/// impl Greet for Data {
/// fn greet(&self) {
/// println!("Hello");
/// }
/// }
/// castable_to! { Data => [sync] std::fmt::Debug, Greet }
///
/// # fn main() {}
/// ```
#[proc_macro]
pub fn castable_to(input: TokenStream) -> TokenStream {
let Casts {
ty,
targets: Targets { flags, paths },
} = parse_macro_input!(input);
paths
.iter()
.map(|t| generate_caster(&ty, t, flags.contains(&Flag::Sync)))
.collect::<proc_macro2::TokenStream>()
.into()
}