Initial commit for kernel-side

Cargo.lock

@@ -9,6 +9,10 @@ dependencies = [
  "syscall-generator",
 ]
 
+[[package]]
+name = "handler"
+version = "0.1.0"
+
 [[package]]
 name = "prettyplease"
 version = "0.2.16"
@@ -52,6 +56,7 @@ dependencies = [
 name = "syscall-generator"
 version = "0.1.0"
 dependencies = [
+ "handler",
  "prettyplease",
  "proc-macro2",
  "quote",

Cargo.toml

@@ -4,11 +4,13 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-prettyplease = "0.2.16"
-proc-macro2 = "1.0.78"
-quote = "1.0.35"
-syn = { version = "2.0.52", features = ["full"] }
-thiserror = "1.0.57"
+prettyplease = "0.2.15"
+proc-macro2 = "^1.0.63"
+quote = "^1.0"
+syn = { version = "2.0.32", features = ["full"] }
+thiserror = "1.0.47"
+
+handler = { path = "handler", optional = true }
 
 [workspace]
-members = ["example-abi"]
+members = ["example-abi", "handler"]

handler/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "handler"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[lib]
+proc-macro = true

src/abi/mod.rs

@@ -13,11 +13,15 @@ use crate::{
         parse_abi, Attributes, BitfieldRange, BitfieldType, BitfieldTypeField,
         DocumentTypeDefinition, EnumType, NewType, ParseError, TypeRepr,
     },
-    Syscall, TargetEnv,
+    TargetEnv,
 };
 
 use self::ty::Type;
 
+mod syscall;
+
+pub use syscall::Syscall;
+
 pub trait GenerateTypeDefinition {
     fn generate_type_definition(&self, abi_type: &ComplexType, env: &TargetEnv) -> TokenStream;
 }
@@ -95,6 +99,12 @@ impl AbiBuilder {
             pub enum SyscallFunction {
                 #syscall_discriminants
             }
+
+            impl From<SyscallFunction> for usize {
+                fn from(value: SyscallFunction) -> usize {
+                    value as usize
+                }
+            }
         });
 
         stream.append_all(self.abi.generate_user_side(&self.target_env));

src/abi/syscall.rs

@@ -0,0 +1,121 @@
+use core::fmt;
+use std::rc::Rc;
+
+use proc_macro2::TokenStream;
+use quote::quote;
+
+use crate::{
+    abi::ty::{SimpleType, Type},
+    TargetEnv,
+};
+
+use super::ty::ComplexType;
+
+pub struct Syscall {
+    pub name: syn::Ident,
+    pub args: Vec<(syn::Ident, Rc<ComplexType>)>,
+    pub return_type: Option<Rc<ComplexType>>,
+}
+
+impl fmt::Debug for Syscall {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Syscall")
+            .field("name", &self.name)
+            .field("args", &self.args)
+            .field("return_type", &self.return_type)
+            .finish_non_exhaustive()
+    }
+}
+
+impl Syscall {
+    // Syntax:
+    //
+    //  syscall_handler!("abi-document.abi", pub syscall_handler {
+    //      read(fd, buffer) => ...,
+    //      write(fd, buffer) => ...,
+    //  })
+    pub fn emit_handler_branch(
+        &self,
+        named_args: &[&syn::Ident],
+        raw_args: &syn::Ident,
+        body: &syn::ExprBlock,
+        enum_variant: &syn::Ident,
+        env: &TargetEnv,
+    ) -> TokenStream {
+        if self.args.len() != named_args.len() {
+            todo!()
+        }
+
+        let mut extracted_arguments = TokenStream::new();
+        let mut index = 0;
+
+        for ((_, arg), &name) in std::iter::zip(self.args.iter(), named_args) {
+            let (arg_expr, arg_width) = arg.emit_from_syscall_arguments(env, raw_args, index);
+            let arg_assignment = quote! {
+                let #name = #arg_expr;
+            };
+            index += arg_width;
+
+            extracted_arguments.extend(arg_assignment);
+        }
+
+        quote! {
+            #enum_variant => {
+                #extracted_arguments
+
+                #body
+            }
+        }
+    }
+
+    pub fn emit_stub(&self, enum_variant: &syn::Ident, env: &TargetEnv) -> TokenStream {
+        let Self {
+            name,
+            args,
+            return_type,
+        } = self;
+
+        let syscall_args = args
+            .iter()
+            .map(|(name, ty)| {
+                let arg = ty.emit_to_syscall_arguments(env, name);
+                quote!(#arg,)
+            })
+            .collect::<TokenStream>();
+        let args = args
+            .iter()
+            .map(|(name, ty)| {
+                let ty = ty.as_rust_type();
+                quote!(#name: #ty,)
+            })
+            .collect::<TokenStream>();
+        let return_type_arrow = return_type.as_ref().map(|ty| {
+            let ty = ty.as_rust_type();
+            quote!(-> #ty)
+        });
+
+        let sys_call = quote!(syscall!(SyscallFunction::#enum_variant, #syscall_args));
+
+        let wrapped = match return_type.as_deref() {
+            Some(ComplexType::Simple(SimpleType::Never)) => {
+                quote! {
+                    #sys_call;
+                    unreachable!()
+                }
+            }
+            Some(ty) => {
+                let ty = ty.as_rust_type();
+                quote!(<#ty>::from_syscall_register(#sys_call))
+            }
+            None => quote!(#sys_call;),
+        };
+
+        let v = quote! {
+            pub unsafe fn #name(#args) #return_type_arrow {
+                #wrapped
+            }
+        };
+        println!("{}", v);
+        v
+    }
+}

src/abi/ty/complex.rs

@@ -113,6 +113,15 @@ impl Type for ComplexType {
             _ => todo!(),
         }
     }
+
+    fn emit_from_syscall_arguments(
+        &self,
+        _env: &TargetEnv,
+        _args: &Ident,
+        _index: usize,
+    ) -> (TokenStream, usize) {
+        todo!()
+    }
 }
 
 impl fmt::Debug for ComplexType {

src/abi/ty/mod.rs

@@ -25,6 +25,12 @@ pub trait Type {
     fn as_rust_type(&self) -> TokenStream;
 
     fn emit_to_syscall_arguments(&self, env: &TargetEnv, value: &Ident) -> TokenStream;
+    fn emit_from_syscall_arguments(
+        &self,
+        env: &TargetEnv,
+        args: &Ident,
+        index: usize,
+    ) -> (TokenStream, usize);
 
     fn as_rust_ref_type(&self, mutable: bool) -> TokenStream {
         let inner = self.as_rust_type();

src/abi/ty/primitive.rs

@@ -60,6 +60,15 @@ impl Type for AbiPrimitive {
     fn emit_to_syscall_arguments(&self, _env: &TargetEnv, value: &Ident) -> TokenStream {
         quote!(#value as usize)
     }
+
+    fn emit_from_syscall_arguments(
+        &self,
+        _env: &TargetEnv,
+        _args: &Ident,
+        _index: usize,
+    ) -> (TokenStream, usize) {
+        todo!()
+    }
 }
 
 impl FromStr for AbiPrimitive {

src/abi/ty/simple.rs

@@ -101,4 +101,13 @@ impl Type for SimpleType {
             },
         }
     }
+
+    fn emit_from_syscall_arguments(
+        &self,
+        _env: &TargetEnv,
+        _args: &Ident,
+        _index: usize,
+    ) -> (TokenStream, usize) {
+        todo!()
+    }
 }

src/lib.rs

@@ -1,88 +1,13 @@
 #![feature(if_let_guard, extend_one, proc_macro_span)]
 
-use std::{fmt, rc::Rc};
-
-use proc_macro2::TokenStream;
-use quote::quote;
-use syn::Ident;
-
-use crate::abi::ty::{ComplexType, SimpleType, Type, TypeWidth};
+use crate::abi::ty::TypeWidth;
 
 pub mod abi;
 pub mod error;
 pub mod syntax;
 
-pub struct Syscall {
-    pub name: Ident,
-    pub args: Vec<(Ident, Rc<ComplexType>)>,
-    pub return_type: Option<Rc<ComplexType>>,
-}
-
-impl fmt::Debug for Syscall {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Syscall")
-            .field("name", &self.name)
-            .field("args", &self.args)
-            .field("return_type", &self.return_type)
-            .finish_non_exhaustive()
-    }
-}
-
 #[derive(Debug, PartialEq, Eq, Clone)]
 pub struct TargetEnv {
     pub thin_pointer_width: TypeWidth,
     pub fat_pointer_width: TypeWidth,
 }
-
-impl Syscall {
-    pub fn emit_stub(&self, enum_variant: &syn::Ident, env: &TargetEnv) -> TokenStream {
-        let Self {
-            name,
-            args,
-            return_type,
-        } = self;
-
-        let syscall_args = args
-            .iter()
-            .map(|(name, ty)| {
-                let arg = ty.emit_to_syscall_arguments(env, name);
-                quote!(#arg,)
-            })
-            .collect::<TokenStream>();
-        let args = args
-            .iter()
-            .map(|(name, ty)| {
-                let ty = ty.as_rust_type();
-                quote!(#name: #ty,)
-            })
-            .collect::<TokenStream>();
-        let return_type_arrow = return_type.as_ref().map(|ty| {
-            let ty = ty.as_rust_type();
-            quote!(-> #ty)
-        });
-
-        let sys_call = quote!(syscall!(SyscallFunction::#enum_variant, #syscall_args));
-
-        let wrapped = match return_type.as_deref() {
-            Some(ComplexType::Simple(SimpleType::Never)) => {
-                quote! {
-                    #sys_call;
-                    unreachable!()
-                }
-            }
-            Some(ty) => {
-                let ty = ty.as_rust_type();
-                quote!(<#ty>::from_syscall_register(#sys_call))
-            }
-            None => quote!(#sys_call;),
-        };
-
-        let v = quote! {
-            pub unsafe fn #name(#args) #return_type_arrow {
-                #wrapped
-            }
-        };
-        println!("{}", v);
-        v
-    }
-}

src/syntax/bitfield_type.rs

@@ -35,7 +35,7 @@ impl DocumentItemAttributes for BitfieldType {
 }
 
 impl syn::parse::Parse for BitfieldRange {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let start = input.parse()?;
         if input.peek(Token![..]) {
             input.parse::<Token![..]>()?;
@@ -48,7 +48,7 @@ impl syn::parse::Parse for BitfieldRange {
 }
 
 impl syn::parse::Parse for BitfieldTypeField {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let attributes = input.parse()?;
         let name = input.parse()?;
         input.parse::<Token![:]>()?;
@@ -62,7 +62,7 @@ impl syn::parse::Parse for BitfieldTypeField {
 }
 
 impl syn::parse::Parse for BitfieldType {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let fields;
         let attributes = input.parse()?;
         let name = input.parse()?;

src/syntax/common.rs

@@ -30,13 +30,13 @@ impl DerefMut for Attributes {
 }
 
 impl syn::parse::Parse for Attributes {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         syn::Attribute::parse_outer(input).map(Self)
     }
 }
 
 impl syn::parse::Parse for TypeRepr {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let content;
         parenthesized!(content in input);
         let content = content.parse_terminated(syn::Ident::parse, Token![,])?;

src/syntax/document.rs

@@ -39,7 +39,7 @@ enum DocumentItem {
 }
 
 impl syn::parse::Parse for DocumentItem {
-    fn parse(input: ParseStream) -> syn::Result<Self> {
+    fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
         let lookahead = input.lookahead1();
 
         if lookahead.peek(Token![extern]) {
@@ -87,7 +87,7 @@ impl DocumentItemAttributes for DocumentItem {
 }
 
 impl syn::parse::Parse for Document {
-    fn parse(input: ParseStream) -> syn::Result<Self> {
+    fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
         let mut types = vec![];
         let mut syscalls = vec![];
 

src/syntax/enum_type.rs

@@ -23,7 +23,7 @@ pub struct EnumType {
 }
 
 impl syn::parse::Parse for EnumTypeVariant {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let attributes = input.parse()?;
         let discriminant = input.parse()?;
         let value = if input.peek(Token![=]) {
@@ -42,7 +42,7 @@ impl syn::parse::Parse for EnumTypeVariant {
 }
 
 impl syn::parse::Parse for EnumType {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let variants;
         let attributes = input.parse()?;
         let name = input.parse()?;

src/syntax/extern_block.rs

@@ -16,7 +16,7 @@ pub struct ExternTypeBlock {
 }
 
 impl syn::parse::Parse for ExternType {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let attributes = input.parse()?;
         input.parse::<Token![type]>()?;
         let name = input.parse()?;
@@ -35,7 +35,7 @@ impl syn::parse::Parse for ExternType {
 }
 
 impl syn::parse::Parse for ExternTypeBlock {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let types;
         braced!(types in input);
         let types = types.parse_terminated(ExternType::parse, Token![;])?;

src/syntax/mod.rs

@@ -2,13 +2,10 @@ use std::{collections::HashMap, rc::Rc, str::FromStr};
 
 use syn::{punctuated::Punctuated, Expr, ExprLit, Lit, PathSegment};
 
-use crate::{
-    abi::{
-        syscall_enum_variant_identifier,
-        ty::{complex::ExternKind, AbiPrimitive, ComplexType, SimpleType},
-        Abi,
-    },
-    Syscall,
+use crate::abi::{
+    syscall_enum_variant_identifier,
+    ty::{complex::ExternKind, AbiPrimitive, ComplexType, SimpleType},
+    Abi, Syscall,
 };
 
 mod common;

src/syntax/newtype.rs

@@ -22,7 +22,7 @@ impl DocumentItemAttributes for NewType {
 }
 
 impl syn::parse::Parse for NewType {
-    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
         let attributes = input.parse()?;
         let name = input.parse()?;
         let repr = input.parse()?;

src/syntax/syscall.rs

@@ -22,7 +22,7 @@ impl DocumentItemAttributes for SyscallDefinition {
 }
 
 impl syn::parse::Parse for SyscallDefinition {
-    fn parse(input: ParseStream) -> syn::Result<Self> {
+    fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
         let arguments;
 
         let name = input.parse()?;
@@ -49,7 +49,7 @@ impl syn::parse::Parse for SyscallDefinition {
 }
 
 impl syn::parse::Parse for SyscallArgument {
-    fn parse(input: ParseStream) -> syn::Result<Self> {
+    fn parse(input: ParseStream<'_>) -> syn::Result<Self> {
         let name = input.parse()?;
         input.parse::<Token![:]>()?;
         let ty = input.parse()?;