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Iterate over maybe_unused_trait_imports when checking dead trait imports

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This commit is contained in:
Elliot Roberts 2022-05-31 16:59:28 -07:00
parent 6f481f8b71
commit 76c6845a85
6 changed files with 29 additions and 45 deletions
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4
compiler/rustc_middle/src/query/mod.rs
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@ -1728,8 +1728,8 @@
query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
}
query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
query maybe_unused_trait_imports(_: ()) -> &'tcx FxIndexSet<LocalDefId> {
desc { "fetching potentially unused trait imports" }
}
query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
desc { "looking up all possibly unused extern crates" }

4
compiler/rustc_middle/src/ty/context.rs
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@ -2886,8 +2886,8 @@ pub fn provide(providers: &mut ty::query::Providers) {
assert_eq!(id, LOCAL_CRATE);
tcx.crate_name
};
providers.maybe_unused_trait_import =
|tcx, id| tcx.resolutions(()).maybe_unused_trait_imports.contains(&id);
providers.maybe_unused_trait_imports =
|tcx, ()| &tcx.resolutions(()).maybe_unused_trait_imports;
providers.maybe_unused_extern_crates =
|tcx, ()| &tcx.resolutions(()).maybe_unused_extern_crates[..];
providers.names_imported_by_glob_use = |tcx, id| {

4
compiler/rustc_middle/src/ty/mod.rs
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@ -28,7 +28,7 @@
use rustc_ast as ast;
use rustc_attr as attr;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
use rustc_data_structures::intern::{Interned, WithStableHash};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::tagged_ptr::CopyTaggedPtr;
@ -138,7 +138,7 @@ pub struct ResolverOutputs {
pub has_pub_restricted: bool,
pub access_levels: AccessLevels,
pub extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
pub maybe_unused_trait_imports: FxHashSet<LocalDefId>,
pub maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
pub maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
pub reexport_map: FxHashMap<LocalDefId, Vec<ModChild>>,
pub glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,

2
compiler/rustc_middle/src/ty/query.rs
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@ -37,7 +37,7 @@
use rustc_ast as ast;
use rustc_ast::expand::allocator::AllocatorKind;
use rustc_attr as attr;
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
use rustc_data_structures::steal::Steal;
use rustc_data_structures::svh::Svh;
use rustc_data_structures::sync::Lrc;

4
compiler/rustc_resolve/src/lib.rs
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@ -28,7 +28,7 @@
use rustc_ast::{self as ast, NodeId, CRATE_NODE_ID};
use rustc_ast::{AngleBracketedArg, Crate, Expr, ExprKind, GenericArg, GenericArgs, LitKind, Path};
use rustc_ast_lowering::{LifetimeRes, ResolverAstLowering};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
use rustc_data_structures::intern::Interned;
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed};
@ -941,7 +941,7 @@ pub struct Resolver<'a> {
visibilities: FxHashMap<LocalDefId, ty::Visibility>,
has_pub_restricted: bool,
used_imports: FxHashSet<NodeId>,
maybe_unused_trait_imports: FxHashSet<LocalDefId>,
maybe_unused_trait_imports: FxIndexSet<LocalDefId>,
maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
/// Privacy errors are delayed until the end in order to deduplicate them.

56
compiler/rustc_typeck/src/check_unused.rs
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@ -16,48 +16,32 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
used_trait_imports.extend(imports.iter());
}
for id in tcx.hir().items() {
if matches!(tcx.def_kind(id.def_id), DefKind::Use) {
if tcx.visibility(id.def_id).is_public() {
continue;
}
let item = tcx.hir().item(id);
if item.span.is_dummy() {
continue;
}
if let hir::ItemKind::Use(path, _) = item.kind {
check_import(tcx, &mut used_trait_imports, item.item_id(), path.span);
}
for &id in tcx.maybe_unused_trait_imports(()) {
debug_assert_eq!(tcx.def_kind(id), DefKind::Use);
if tcx.visibility(id).is_public() {
continue;
}
if used_trait_imports.contains(&id) {
continue;
}
let item = tcx.hir().expect_item(id);
if item.span.is_dummy() {
continue;
}
let hir::ItemKind::Use(path, _) = item.kind else { unreachable!() };
tcx.struct_span_lint_hir(lint::builtin::UNUSED_IMPORTS, item.hir_id(), path.span, |lint| {
let msg = if let Ok(snippet) = tcx.sess.source_map().span_to_snippet(path.span) {
format!("unused import: `{}`", snippet)
} else {
"unused import".to_owned()
};
lint.build(&msg).emit();
});
}
unused_crates_lint(tcx);
}
fn check_import<'tcx>(
tcx: TyCtxt<'tcx>,
used_trait_imports: &mut FxHashSet<LocalDefId>,
item_id: hir::ItemId,
span: Span,
) {
if !tcx.maybe_unused_trait_import(item_id.def_id) {
return;
}
if used_trait_imports.contains(&item_id.def_id) {
return;
}
tcx.struct_span_lint_hir(lint::builtin::UNUSED_IMPORTS, item_id.hir_id(), span, |lint| {
let msg = if let Ok(snippet) = tcx.sess.source_map().span_to_snippet(span) {
format!("unused import: `{}`", snippet)
} else {
"unused import".to_owned()
};
lint.build(&msg).emit();
});
}
fn unused_crates_lint(tcx: TyCtxt<'_>) {
let lint = lint::builtin::UNUSED_EXTERN_CRATES;