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Only the ROOT syntax context has None outer_expn

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This commit is contained in:
Lukas Wirth 2024-03-01 15:09:12 +01:00
parent eb7a4f293e
commit 8a5bb9d5ac
3 changed files with 20 additions and 13 deletions
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30
crates/hir-expand/src/hygiene.rs
View File

@ -62,7 +62,7 @@ pub(super) fn apply_mark(
transparency: Transparency,
) -> SyntaxContextId {
if transparency == Transparency::Opaque {
return apply_mark_internal(db, ctxt, Some(call_id), transparency);
return apply_mark_internal(db, ctxt, call_id, transparency);
}
let call_site_ctxt = db.lookup_intern_macro_call(call_id).call_site.ctx;
@ -73,7 +73,7 @@ pub(super) fn apply_mark(
};
if call_site_ctxt.is_root() {
return apply_mark_internal(db, ctxt, Some(call_id), transparency);
return apply_mark_internal(db, ctxt, call_id, transparency);
}
// Otherwise, `expn_id` is a macros 1.0 definition and the call site is in a
@ -88,17 +88,19 @@ pub(super) fn apply_mark(
for (call_id, transparency) in ctxt.marks(db) {
call_site_ctxt = apply_mark_internal(db, call_site_ctxt, call_id, transparency);
}
apply_mark_internal(db, call_site_ctxt, Some(call_id), transparency)
apply_mark_internal(db, call_site_ctxt, call_id, transparency)
}
fn apply_mark_internal(
db: &dyn ExpandDatabase,
ctxt: SyntaxContextId,
call_id: Option<MacroCallId>,
call_id: MacroCallId,
transparency: Transparency,
) -> SyntaxContextId {
use base_db::salsa;
let call_id = Some(call_id);
let syntax_context_data = db.lookup_intern_syntax_context(ctxt);
let mut opaque = syntax_context_data.opaque;
let mut opaque_and_semitransparent = syntax_context_data.opaque_and_semitransparent;
@ -148,7 +150,7 @@ pub trait SyntaxContextExt {
fn parent_ctxt(self, db: &dyn ExpandDatabase) -> Self;
fn remove_mark(&mut self, db: &dyn ExpandDatabase) -> (Option<MacroCallId>, Transparency);
fn outer_mark(self, db: &dyn ExpandDatabase) -> (Option<MacroCallId>, Transparency);
fn marks(self, db: &dyn ExpandDatabase) -> Vec<(Option<MacroCallId>, Transparency)>;
fn marks(self, db: &dyn ExpandDatabase) -> Vec<(MacroCallId, Transparency)>;
}
impl SyntaxContextExt for SyntaxContextId {
@ -170,7 +172,7 @@ fn remove_mark(&mut self, db: &dyn ExpandDatabase) -> (Option<MacroCallId>, Tran
*self = data.parent;
(data.outer_expn, data.outer_transparency)
}
fn marks(self, db: &dyn ExpandDatabase) -> Vec<(Option<MacroCallId>, Transparency)> {
fn marks(self, db: &dyn ExpandDatabase) -> Vec<(MacroCallId, Transparency)> {
let mut marks = marks_rev(self, db).collect::<Vec<_>>();
marks.reverse();
marks
@ -181,11 +183,15 @@ fn marks(self, db: &dyn ExpandDatabase) -> Vec<(Option<MacroCallId>, Transparenc
pub fn marks_rev(
ctxt: SyntaxContextId,
db: &dyn ExpandDatabase,
) -> impl Iterator<Item = (Option<MacroCallId>, Transparency)> + '_ {
iter::successors(Some(ctxt), move |&mark| {
Some(mark.parent_ctxt(db)).filter(|&it| it != SyntaxContextId::ROOT)
})
.map(|ctx| ctx.outer_mark(db))
) -> impl Iterator<Item = (MacroCallId, Transparency)> + '_ {
iter::successors(Some(ctxt), move |&mark| Some(mark.parent_ctxt(db)))
.take_while(|&it| !it.is_root())
.map(|ctx| {
let mark = ctx.outer_mark(db);
// We stop before taking the root expansion, as such we cannot encounter a `None` outer
// expansion, as only the ROOT has it.
(mark.0.unwrap(), mark.1)
})
}
pub(crate) fn dump_syntax_contexts(db: &dyn ExpandDatabase) -> String {
@ -224,7 +230,7 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
}
}
pub fn fancy_debug(
fn fancy_debug(
this: &SyntaxContextData,
self_id: SyntaxContextId,
db: &dyn ExpandDatabase,

2
crates/hir-expand/src/mod_path.rs
View File

@ -358,7 +358,7 @@ pub fn resolve_crate_root(db: &dyn ExpandDatabase, mut ctxt: SyntaxContextId) ->
result_mark = Some(mark);
}
result_mark.flatten().map(|call| db.lookup_intern_macro_call(call).def.krate)
result_mark.map(|call| db.lookup_intern_macro_call(call).def.krate)
}
pub use crate::name as __name;

1
crates/span/src/hygiene.rs
View File

@ -68,6 +68,7 @@ pub fn from_u32(u32: u32) -> Self {
/// A syntax context describes a hierarchy tracking order of macro definitions.
#[derive(Copy, Clone, Hash, PartialEq, Eq)]
pub struct SyntaxContextData {
/// Invariant: Only [`SyntaxContextId::ROOT`] has a [`None`] outer expansion.
pub outer_expn: Option<MacroCallId>,
pub outer_transparency: Transparency,
pub parent: SyntaxContextId,