bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/hir-expand/src/db.rs')
-rw-r--r--crates/hir-expand/src/db.rs48
1 files changed, 33 insertions, 15 deletions
diff --git a/crates/hir-expand/src/db.rs b/crates/hir-expand/src/db.rs
index f7a26e436d..ed04582cb0 100644
--- a/crates/hir-expand/src/db.rs
+++ b/crates/hir-expand/src/db.rs
@@ -390,7 +390,13 @@ fn parse_macro_expansion(
let expand_to = loc.expand_to();
let mbe::ValueResult { value: tt, err } = macro_expand(db, macro_file.macro_call_id, loc);
- let (parse, rev_token_map) = token_tree_to_syntax_node(&tt, expand_to);
+ let (parse, rev_token_map) = token_tree_to_syntax_node(
+ match &tt {
+ CowArc::Arc(it) => it,
+ CowArc::Owned(it) => it,
+ },
+ expand_to,
+ );
ExpandResult { value: (parse, Arc::new(rev_token_map)), err }
}
@@ -669,15 +675,20 @@ fn macro_expander(db: &dyn ExpandDatabase, id: MacroDefId) -> TokenExpander {
}
}
+enum CowArc<T> {
+ Arc(Arc<T>),
+ Owned(T),
+}
+
fn macro_expand(
db: &dyn ExpandDatabase,
macro_call_id: MacroCallId,
loc: MacroCallLoc,
-) -> ExpandResult<Arc<tt::Subtree>> {
+) -> ExpandResult<CowArc<tt::Subtree>> {
let _p = profile::span("macro_expand");
let ExpandResult { value: tt, mut err } = match loc.def.kind {
- MacroDefKind::ProcMacro(..) => return db.expand_proc_macro(macro_call_id),
+ MacroDefKind::ProcMacro(..) => return db.expand_proc_macro(macro_call_id).map(CowArc::Arc),
MacroDefKind::BuiltInDerive(expander, ..) => {
let (root, map) = parse_with_map(db, loc.kind.file_id());
let root = root.syntax_node();
@@ -692,7 +703,7 @@ fn macro_expand(
let ValueResult { value, err } = db.macro_arg(macro_call_id);
let Some((macro_arg, undo_info)) = value else {
return ExpandResult {
- value: Arc::new(tt::Subtree {
+ value: CowArc::Owned(tt::Subtree {
delimiter: tt::Delimiter::invisible_spanned(loc.call_site),
token_trees: Vec::new(),
}),
@@ -718,7 +729,7 @@ fn macro_expand(
// As such we just return the input subtree here.
MacroDefKind::BuiltInEager(..) if loc.eager.is_none() => {
return ExpandResult {
- value: macro_arg.clone(),
+ value: CowArc::Arc(macro_arg.clone()),
err: err.map(|err| {
let mut buf = String::new();
for err in &**err {
@@ -752,12 +763,17 @@ fn macro_expand(
// Skip checking token tree limit for include! macro call
if !loc.def.is_include() {
// Set a hard limit for the expanded tt
- if let Err(value) = check_tt_count(&tt, loc.call_site) {
- return value;
+ if let Err(value) = check_tt_count(&tt) {
+ return value.map(|()| {
+ CowArc::Owned(tt::Subtree {
+ delimiter: tt::Delimiter::invisible_spanned(loc.call_site),
+ token_trees: vec![],
+ })
+ });
}
}
- ExpandResult { value: Arc::new(tt), err }
+ ExpandResult { value: CowArc::Owned(tt), err }
}
fn expand_proc_macro(db: &dyn ExpandDatabase, id: MacroCallId) -> ExpandResult<Arc<tt::Subtree>> {
@@ -796,8 +812,13 @@ fn expand_proc_macro(db: &dyn ExpandDatabase, id: MacroCallId) -> ExpandResult<A
);
// Set a hard limit for the expanded tt
- if let Err(value) = check_tt_count(&tt, loc.call_site) {
- return value;
+ if let Err(value) = check_tt_count(&tt) {
+ return value.map(|()| {
+ Arc::new(tt::Subtree {
+ delimiter: tt::Delimiter::invisible_spanned(loc.call_site),
+ token_trees: vec![],
+ })
+ });
}
fixup::reverse_fixups(&mut tt, &undo_info);
@@ -819,14 +840,11 @@ fn token_tree_to_syntax_node(
mbe::token_tree_to_syntax_node(tt, entry_point)
}
-fn check_tt_count(tt: &tt::Subtree, call_site: Span) -> Result<(), ExpandResult<Arc<tt::Subtree>>> {
+fn check_tt_count(tt: &tt::Subtree) -> Result<(), ExpandResult<()>> {
let count = tt.count();
if TOKEN_LIMIT.check(count).is_err() {
Err(ExpandResult {
- value: Arc::new(tt::Subtree {
- delimiter: tt::Delimiter::invisible_spanned(call_site),
- token_trees: vec![],
- }),
+ value: (),
err: Some(ExpandError::other(format!(
"macro invocation exceeds token limit: produced {} tokens, limit is {}",
count,