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Add variant_name function to LangItem

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Clippy has an internal lint that checks for the usage of hardcoded def
paths and suggests to replace them with a lang or diagnostic item, if
possible. This was implemented with a hack, by getting all the variants
of the `LangItem` enum and then index into it with the position of the
`LangItem` in the `items` list. This is no longer possible, because the
`items` list can't be accessed anymore.
This commit is contained in:
Philipp Krones 2022-11-05 15:08:37 +01:00
parent 11d632f7b1
commit 82afb16179
5 changed files with 27 additions and 36 deletions
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12
clippy_lints/src/utils/internal_lints/invalid_paths.rs
View File

@ -79,22 +79,22 @@ pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
SimplifiedTypeGen::StrSimplifiedType,
]
.iter()
.flat_map(|&ty| cx.tcx.incoherent_impls(ty));
for item_def_id in lang_items.items().iter().flatten().chain(incoherent_impls) {
let lang_item_path = cx.get_def_path(*item_def_id);
.flat_map(|&ty| cx.tcx.incoherent_impls(ty).iter().copied());
for item_def_id in lang_items.iter().map(|(_, def_id)| def_id).chain(incoherent_impls) {
let lang_item_path = cx.get_def_path(item_def_id);
if path_syms.starts_with(&lang_item_path) {
if let [item] = &path_syms[lang_item_path.len()..] {
if matches!(
cx.tcx.def_kind(*item_def_id),
cx.tcx.def_kind(item_def_id),
DefKind::Mod | DefKind::Enum | DefKind::Trait
) {
for child in cx.tcx.module_children(*item_def_id) {
for child in cx.tcx.module_children(item_def_id) {
if child.ident.name == *item {
return true;
}
}
} else {
for child in cx.tcx.associated_item_def_ids(*item_def_id) {
for child in cx.tcx.associated_item_def_ids(item_def_id) {
if cx.tcx.item_name(*child) == *item {
return true;
}

19
clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs
View File

@ -6,7 +6,7 @@
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Namespace, Res};
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::DefId;
use rustc_hir::{Expr, ExprKind, Local, Mutability, Node};
use rustc_lint::{LateContext, LateLintPass};
@ -91,7 +91,7 @@ impl UnnecessaryDefPath {
#[allow(clippy::too_many_lines)]
fn check_call(&mut self, cx: &LateContext<'_>, func: &Expr<'_>, args: &[Expr<'_>], span: Span) {
enum Item {
LangItem(Symbol),
LangItem(&'static str),
DiagnosticItem(Symbol),
}
static PATHS: &[&[&str]] = &[
@ -325,18 +325,9 @@ fn inherent_def_path_res(cx: &LateContext<'_>, segments: &[&str]) -> Option<DefI
})
}
fn get_lang_item_name(cx: &LateContext<'_>, def_id: DefId) -> Option<Symbol> {
if let Some(lang_item) = cx.tcx.lang_items().items().iter().position(|id| *id == Some(def_id)) {
let lang_items = def_path_res(cx, &["rustc_hir", "lang_items", "LangItem"], Some(Namespace::TypeNS)).def_id();
let item_name = cx
.tcx
.adt_def(lang_items)
.variants()
.iter()
.nth(lang_item)
.unwrap()
.name;
Some(item_name)
fn get_lang_item_name(cx: &LateContext<'_>, def_id: DefId) -> Option<&'static str> {
if let Some((lang_item, _)) = cx.tcx.lang_items().iter().find(|(_, id)| *id == def_id) {
Some(lang_item.variant_name())
} else {
None
}

6
tests/ui-internal/unnecessary_def_path.fixed
View File

@ -48,14 +48,14 @@ fn _f<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, did: DefId, expr: &Expr<'_>) {
let _ = is_type_lang_item(cx, ty, LangItem::OwnedBox);
let _ = is_type_diagnostic_item(cx, ty, sym::maybe_uninit_uninit);
let _ = cx.tcx.lang_items().require(LangItem::OwnedBox).ok() == Some(did);
let _ = cx.tcx.lang_items().get(LangItem::OwnedBox) == Some(did);
let _ = cx.tcx.is_diagnostic_item(sym::Option, did);
let _ = cx.tcx.lang_items().require(LangItem::OptionSome).ok() == Some(did);
let _ = cx.tcx.lang_items().get(LangItem::OptionSome) == Some(did);
let _ = is_trait_method(cx, expr, sym::AsRef);
let _ = is_path_diagnostic_item(cx, expr, sym::Option);
let _ = path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().require(LangItem::IteratorNext).ok() == Some(id));
let _ = path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().get(LangItem::IteratorNext) == Some(id));
let _ = is_res_lang_ctor(cx, path_res(cx, expr), LangItem::OptionSome);
}

6
tests/ui-internal/unnecessary_def_path.stderr
View File

@ -57,7 +57,7 @@ error: use of a def path to a `LangItem`
--> $DIR/unnecessary_def_path.rs:51:13
|
LL | let _ = match_def_path(cx, did, &["alloc", "boxed", "Box"]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cx.tcx.lang_items().require(LangItem::OwnedBox).ok() == Some(did)`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cx.tcx.lang_items().get(LangItem::OwnedBox) == Some(did)`
error: use of a def path to a diagnostic item
--> $DIR/unnecessary_def_path.rs:52:13
@ -69,7 +69,7 @@ error: use of a def path to a `LangItem`
--> $DIR/unnecessary_def_path.rs:53:13
|
LL | let _ = match_def_path(cx, did, &["core", "option", "Option", "Some"]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cx.tcx.lang_items().require(LangItem::OptionSome).ok() == Some(did)`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cx.tcx.lang_items().get(LangItem::OptionSome) == Some(did)`
|
= help: if this `DefId` came from a constructor expression or pattern then the parent `DefId` should be used instead
@ -89,7 +89,7 @@ error: use of a def path to a `LangItem`
--> $DIR/unnecessary_def_path.rs:58:13
|
LL | let _ = is_expr_path_def_path(cx, expr, &["core", "iter", "traits", "Iterator", "next"]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().require(LangItem::IteratorNext).ok() == Some(id))`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().get(LangItem::IteratorNext) == Some(id))`
error: use of a def path to a `LangItem`
--> $DIR/unnecessary_def_path.rs:59:13

20
tests/ui-internal/unnecessary_def_path_hardcoded_path.stderr
View File

@ -1,10 +1,10 @@
error: hardcoded path to a language item
--> $DIR/unnecessary_def_path_hardcoded_path.rs:11:40
error: hardcoded path to a diagnostic item
--> $DIR/unnecessary_def_path_hardcoded_path.rs:10:36
|
LL | const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | const DEREF_TRAIT: [&str; 4] = ["core", "ops", "deref", "Deref"];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: convert all references to use `LangItem::DerefMut`
= help: convert all references to use `sym::Deref`
= note: `-D clippy::unnecessary-def-path` implied by `-D warnings`
error: hardcoded path to a diagnostic item
@ -15,13 +15,13 @@ LL | const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref",
|
= help: convert all references to use `sym::deref_method`
error: hardcoded path to a diagnostic item
--> $DIR/unnecessary_def_path_hardcoded_path.rs:10:36
error: hardcoded path to a language item
--> $DIR/unnecessary_def_path_hardcoded_path.rs:11:40
|
LL | const DEREF_TRAIT: [&str; 4] = ["core", "ops", "deref", "Deref"];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: convert all references to use `sym::Deref`
= help: convert all references to use `LangItem::DerefMut`
error: aborting due to 3 previous errors