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internal: Shrink ProcMacroExpander from 8 to 4 bytes

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This commit is contained in:
Lukas Wirth 2023-05-20 10:38:25 +02:00
parent 54129fa113
commit 14dc1ac3bf
2 changed files with 14 additions and 11 deletions
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23
crates/hir-expand/src/proc_macro.rs
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@ -7,20 +7,23 @@ use crate::{db::ExpandDatabase, tt, ExpandError, ExpandResult};
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub struct ProcMacroExpander {
proc_macro_id: Option<ProcMacroId>,
proc_macro_id: ProcMacroId,
}
const DUMMY_ID: u32 = !0;
impl ProcMacroExpander {
pub fn new(proc_macro_id: ProcMacroId) -> Self {
Self { proc_macro_id: Some(proc_macro_id) }
assert_ne!(proc_macro_id.0, DUMMY_ID);
Self { proc_macro_id }
}
pub fn dummy() -> Self {
Self { proc_macro_id: None }
Self { proc_macro_id: ProcMacroId(DUMMY_ID) }
}
pub fn is_dummy(&self) -> bool {
self.proc_macro_id.is_none()
self.proc_macro_id.0 == DUMMY_ID
}
pub fn expand(
@ -32,7 +35,10 @@ impl ProcMacroExpander {
attr_arg: Option<&tt::Subtree>,
) -> ExpandResult<tt::Subtree> {
match self.proc_macro_id {
Some(id) => {
ProcMacroId(DUMMY_ID) => {
ExpandResult::new(tt::Subtree::empty(), ExpandError::UnresolvedProcMacro(def_crate))
}
ProcMacroId(id) => {
let proc_macros = db.proc_macros();
let proc_macros = match proc_macros.get(&def_crate) {
Some(Ok(proc_macros)) => proc_macros,
@ -44,13 +50,13 @@ impl ProcMacroExpander {
);
}
};
let proc_macro = match proc_macros.get(id.0 as usize) {
let proc_macro = match proc_macros.get(id as usize) {
Some(proc_macro) => proc_macro,
None => {
never!(
"Proc macro index out of bounds: the length is {} but the index is {}",
proc_macros.len(),
id.0
id
);
return ExpandResult::new(
tt::Subtree::empty(),
@ -81,9 +87,6 @@ impl ProcMacroExpander {
},
}
}
None => {
ExpandResult::new(tt::Subtree::empty(), ExpandError::UnresolvedProcMacro(def_crate))
}
}
}
}