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Stop relying on hashmap iteration for unused macro rules arms

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Noratrieb 2024-10-17 19:51:18 +02:00 committed by Jubilee Young
parent 3efd5926f6
commit 0c8d81b4df
6 changed files with 49 additions and 36 deletions
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6
compiler/rustc_resolve/src/build_reduced_graph.rs
View File

@ -1193,7 +1193,11 @@ impl<'a, 'ra, 'tcx> BuildReducedGraphVisitor<'a, 'ra, 'tcx> {
if !ident.as_str().starts_with('_') {
self.r.unused_macros.insert(def_id, (node_id, ident));
for (rule_i, rule_span) in &self.r.macro_map[&def_id.to_def_id()].rule_spans {
self.r.unused_macro_rules.insert((def_id, *rule_i), (ident, *rule_span));
self.r
.unused_macro_rules
.entry(def_id)
.or_default()
.insert(*rule_i, (ident, *rule_span));
}
}
}

3
compiler/rustc_resolve/src/lib.rs
View File

@ -1122,7 +1122,8 @@ pub struct Resolver<'ra, 'tcx> {
local_macro_def_scopes: FxHashMap<LocalDefId, Module<'ra>>,
ast_transform_scopes: FxHashMap<LocalExpnId, Module<'ra>>,
unused_macros: FxHashMap<LocalDefId, (NodeId, Ident)>,
unused_macro_rules: FxHashMap<(LocalDefId, usize), (Ident, Span)>,
/// A map from the macro to all its potentially unused arms.
unused_macro_rules: FxIndexMap<LocalDefId, FxHashMap<usize, (Ident, Span)>>,
proc_macro_stubs: FxHashSet<LocalDefId>,
/// Traces collected during macro resolution and validated when it's complete.
single_segment_macro_resolutions:

32
compiler/rustc_resolve/src/macros.rs
View File

@ -340,7 +340,9 @@ impl<'ra, 'tcx> ResolverExpand for Resolver<'ra, 'tcx> {
fn record_macro_rule_usage(&mut self, id: NodeId, rule_i: usize) {
let did = self.local_def_id(id);
self.unused_macro_rules.remove(&(did, rule_i));
if let Some(rules) = self.unused_macro_rules.get_mut(&did) {
rules.remove(&rule_i);
}
}
fn check_unused_macros(&mut self) {
@ -352,18 +354,24 @@ impl<'ra, 'tcx> ResolverExpand for Resolver<'ra, 'tcx> {
BuiltinLintDiag::UnusedMacroDefinition(ident.name),
);
}
for (&(def_id, arm_i), &(ident, rule_span)) in self.unused_macro_rules.iter() {
if self.unused_macros.contains_key(&def_id) {
// We already lint the entire macro as unused
continue;
for (&def_id, unused_arms) in self.unused_macro_rules.iter() {
let mut unused_arms = unused_arms.iter().collect::<Vec<_>>();
unused_arms.sort_by_key(|&(&arm_i, _)| arm_i);
for (&arm_i, &(ident, rule_span)) in unused_arms {
if self.unused_macros.contains_key(&def_id) {
// We already lint the entire macro as unused
continue;
}
let node_id = self.def_id_to_node_id[def_id];
self.lint_buffer.buffer_lint(
UNUSED_MACRO_RULES,
node_id,
rule_span,
BuiltinLintDiag::MacroRuleNeverUsed(arm_i, ident.name),
);
}
let node_id = self.def_id_to_node_id[def_id];
self.lint_buffer.buffer_lint(
UNUSED_MACRO_RULES,
node_id,
rule_span,
BuiltinLintDiag::MacroRuleNeverUsed(arm_i, ident.name),
);
}
}

12
tests/ui/lint/unused/unused-macro-rules-compile-error.stderr
View File

@ -10,17 +10,17 @@ note: the lint level is defined here
LL | #![deny(unused_macro_rules)]
| ^^^^^^^^^^^^^^^^^^
error: rule #3 of macro `num2` is never used
--> $DIR/unused-macro-rules-compile-error.rs:22:5
|
LL | (two_) => { compile_error! };
| ^^^^^^
error: rule #2 of macro `num2` is never used
--> $DIR/unused-macro-rules-compile-error.rs:20:5
|
LL | (two) => { fn compile_error() {} };
| ^^^^^
error: rule #3 of macro `num2` is never used
--> $DIR/unused-macro-rules-compile-error.rs:22:5
|
LL | (two_) => { compile_error! };
| ^^^^^^
error: aborting due to 3 previous errors

16
tests/ui/lint/unused/unused-macro-rules-decl.stderr
View File

@ -1,8 +1,8 @@
error: rule #4 of macro `num` is never used
--> $DIR/unused-macro-rules-decl.rs:11:5
error: rule #2 of macro `num` is never used
--> $DIR/unused-macro-rules-decl.rs:9:5
|
LL | (four) => { 4 },
| ^^^^^^
LL | (two) => { 2 },
| ^^^^^
|
note: the lint level is defined here
--> $DIR/unused-macro-rules-decl.rs:2:9
@ -10,11 +10,11 @@ note: the lint level is defined here
LL | #![deny(unused_macro_rules)]
| ^^^^^^^^^^^^^^^^^^
error: rule #2 of macro `num` is never used
--> $DIR/unused-macro-rules-decl.rs:9:5
error: rule #4 of macro `num` is never used
--> $DIR/unused-macro-rules-decl.rs:11:5
|
LL | (two) => { 2 },
| ^^^^^
LL | (four) => { 4 },
| ^^^^^^
error: rule #3 of macro `num_rec` is never used
--> $DIR/unused-macro-rules-decl.rs:31:5

16
tests/ui/lint/unused/unused-macro-rules.stderr
View File

@ -1,8 +1,8 @@
error: rule #4 of macro `num` is never used
--> $DIR/unused-macro-rules.rs:10:5
error: rule #2 of macro `num` is never used
--> $DIR/unused-macro-rules.rs:8:5
|
LL | (four) => { 4 };
| ^^^^^^
LL | (two) => { 2 };
| ^^^^^
|
note: the lint level is defined here
--> $DIR/unused-macro-rules.rs:1:9
@ -10,11 +10,11 @@ note: the lint level is defined here
LL | #![deny(unused_macro_rules)]
| ^^^^^^^^^^^^^^^^^^
error: rule #2 of macro `num` is never used
--> $DIR/unused-macro-rules.rs:8:5
error: rule #4 of macro `num` is never used
--> $DIR/unused-macro-rules.rs:10:5
|
LL | (two) => { 2 };
| ^^^^^
LL | (four) => { 4 };
| ^^^^^^
error: rule #3 of macro `num_rec` is never used
--> $DIR/unused-macro-rules.rs:30:5