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wayland: optimize parsing of fixed-size messages

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Julian Orth 2026-03-28 22:07:41 +01:00
parent b745e20f7f
commit 755bfdd661
6 changed files with 92 additions and 25 deletions
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95
build/wire.rs
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@ -6,7 +6,7 @@ use {
wire::parser::{Field, Lined, Message, Type, parse_messages, to_camel},
},
anyhow::{Context, Result},
std::{fs::DirEntry, io::Write, os::unix::ffi::OsStrExt},
std::{fmt, fs::DirEntry, io::Write, os::unix::ffi::OsStrExt},
};
fn write_type<W: Write>(f: &mut W, ty: &Type) -> Result<()> {
@ -110,26 +110,81 @@ fn write_message<W: Write>(f: &mut W, obj: &str, message: &Message) -> Result<()
" fn parse({}: &mut MsgParser<'_, 'a>) -> Result<Self, MsgParserError> {{",
parser
)?;
writeln!(f, " Ok(Self {{")?;
writeln!(f, " self_id: {}Id::NONE,", obj)?;
for field in &message.fields {
let p = match &field.val.ty.val {
Type::Id(..) => "object",
Type::U32 => "uint",
Type::I32 => "int",
Type::U64 => "u64",
Type::U64Rev => "u64_rev",
Type::OptStr => "optstr",
Type::Str => "str",
Type::Fixed => "fixed",
Type::Fd => "fd",
Type::BStr => "bstr",
Type::Array(_) => "binary_array",
Type::Pod(_) => "binary",
};
writeln!(f, " {}: parser.{}()?,", field.val.name, p)?;
if message.is_fixed_size {
writeln!(f, " let [")?;
for (i, field) in message.fields.iter().enumerate() {
match &field.val.ty.val {
Type::U64 => {
writeln!(f, " arg{i}_hi,")?;
writeln!(f, " arg{i}_lo,")?;
}
Type::U64Rev => {
writeln!(f, " arg{i}_lo,")?;
writeln!(f, " arg{i}_hi,")?;
}
Type::Fd => {}
_ => {
writeln!(f, " arg{i},")?;
}
}
}
writeln!(f, " ] = *{parser}.data() else {{")?;
writeln!(
f,
" return Err(MsgParserError::UnexpectedMessageSize);"
)?;
writeln!(f, " }};")?;
writeln!(f, " Ok(Self {{")?;
writeln!(f, " self_id: {}Id::NONE,", obj)?;
for (i, field) in message.fields.iter().enumerate() {
writeln!(
f,
" {}: {},",
field.val.name,
fmt::from_fn(|f| {
match &field.val.ty.val {
Type::Id(_, name) => write!(f, "{name}Id(arg{i})"),
Type::U32 => write!(f, "arg{i}"),
Type::I32 => write!(f, "arg{i} as i32"),
Type::U64 | Type::U64Rev => {
write!(f, "((arg{i}_hi as u64) << 32) | (arg{i}_lo as u64)")
}
Type::OptStr => unreachable!(),
Type::Str => unreachable!(),
Type::Fixed => write!(f, "Fixed(arg{i} as i32)"),
Type::Fd => write!(f, "parser.fd()?"),
Type::BStr => unreachable!(),
Type::Array(_) => unreachable!(),
Type::Pod(_) => unreachable!(),
}
})
)?;
}
writeln!(f, " }})")?;
} else {
writeln!(f, " let res = Ok(Self {{")?;
writeln!(f, " self_id: {}Id::NONE,", obj)?;
for field in &message.fields {
let p = match &field.val.ty.val {
Type::Id(..) => "object",
Type::U32 => "uint",
Type::I32 => "int",
Type::U64 => "u64",
Type::U64Rev => "u64_rev",
Type::OptStr => "optstr",
Type::Str => "str",
Type::Fixed => "fixed",
Type::Fd => "fd",
Type::BStr => "bstr",
Type::Array(_) => "binary_array",
Type::Pod(_) => "binary",
};
writeln!(f, " {}: parser.{}()?,", field.val.name, p)?;
}
writeln!(f, " }});")?;
writeln!(f, " parser.eof()?;")?;
writeln!(f, " res")?;
}
writeln!(f, " }})")?;
writeln!(f, " }}")?;
writeln!(f, " }}")?;
writeln!(