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Rollup merge of rust-lang#59316 - flip1995:internal_lints_take_2, r=o…
…li-obk Internal lints take 2 cc rust-lang#58701 cc rust-lang#49509 TODO: Add `#![warn(internal)]` to crates (and fix violations) Crates depending on `rustc_data_structures` - [x] librustc_resolve - [x] librustc_driver - [x] librustc_passes - [x] librustc_metadata - [x] librustc_interface - [x] librustc_save_analysis - [x] librustc_lint - [x] librustc - [x] librustc_incremental - [x] librustc_codegen_utils - [x] libarena - [x] librustc_target - [x] librustc_allocator - [x] librustc_privacy - [x] librustc_traits - [x] librustc_borrowck - [x] libsyntax - [x] librustc_codegen_ssa - [x] libsyntax_ext - [x] librustc_errors - [x] librustc_mir - [x] libsyntax_pos - [x] librustc_typeck Crates with `feature(rustc_private)` Excluding crates, which are already in the list above. Also excluding tools and tests. - [ ] ~~libstd~~ - [x] libfmt_macros - [x] librustdoc r? @oli-obk
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| //! Some lints that are only useful in the compiler or crates that use compiler internals, such as | ||
| //! Clippy. | ||
| use crate::hir::{HirId, Path, PathSegment, QPath, Ty, TyKind}; | ||
| use crate::lint::{ | ||
| EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintArray, LintContext, LintPass, | ||
| }; | ||
| use errors::Applicability; | ||
| use rustc_data_structures::fx::FxHashMap; | ||
| use syntax::ast::Ident; | ||
|
|
||
| declare_lint! { | ||
| pub DEFAULT_HASH_TYPES, | ||
| Allow, | ||
| "forbid HashMap and HashSet and suggest the FxHash* variants" | ||
| } | ||
|
|
||
| pub struct DefaultHashTypes { | ||
| map: FxHashMap<String, String>, | ||
| } | ||
|
|
||
| impl DefaultHashTypes { | ||
| pub fn new() -> Self { | ||
| let mut map = FxHashMap::default(); | ||
| map.insert("HashMap".to_string(), "FxHashMap".to_string()); | ||
| map.insert("HashSet".to_string(), "FxHashSet".to_string()); | ||
| Self { map } | ||
| } | ||
| } | ||
|
|
||
| impl LintPass for DefaultHashTypes { | ||
| fn get_lints(&self) -> LintArray { | ||
| lint_array!(DEFAULT_HASH_TYPES) | ||
| } | ||
|
|
||
| fn name(&self) -> &'static str { | ||
| "DefaultHashTypes" | ||
| } | ||
| } | ||
|
|
||
| impl EarlyLintPass for DefaultHashTypes { | ||
| fn check_ident(&mut self, cx: &EarlyContext<'_>, ident: Ident) { | ||
| let ident_string = ident.to_string(); | ||
| if let Some(replace) = self.map.get(&ident_string) { | ||
| let msg = format!( | ||
| "Prefer {} over {}, it has better performance", | ||
| replace, ident_string | ||
| ); | ||
| let mut db = cx.struct_span_lint(DEFAULT_HASH_TYPES, ident.span, &msg); | ||
| db.span_suggestion( | ||
| ident.span, | ||
| "use", | ||
| replace.to_string(), | ||
| Applicability::MaybeIncorrect, // FxHashMap, ... needs another import | ||
| ); | ||
| db.note(&format!( | ||
| "a `use rustc_data_structures::fx::{}` may be necessary", | ||
| replace | ||
| )) | ||
| .emit(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| declare_lint! { | ||
| pub USAGE_OF_TY_TYKIND, | ||
| Allow, | ||
| "Usage of `ty::TyKind` outside of the `ty::sty` module" | ||
| } | ||
|
|
||
| pub struct TyKindUsage; | ||
|
|
||
| impl LintPass for TyKindUsage { | ||
| fn get_lints(&self) -> LintArray { | ||
| lint_array!(USAGE_OF_TY_TYKIND) | ||
| } | ||
|
|
||
| fn name(&self) -> &'static str { | ||
| "TyKindUsage" | ||
| } | ||
| } | ||
|
|
||
| impl<'a, 'tcx> LateLintPass<'a, 'tcx> for TyKindUsage { | ||
| fn check_path(&mut self, cx: &LateContext<'_, '_>, path: &'tcx Path, _: HirId) { | ||
| let segments = path.segments.iter().rev().skip(1).rev(); | ||
|
|
||
| if let Some(last) = segments.last() { | ||
| let span = path.span.with_hi(last.ident.span.hi()); | ||
| if lint_ty_kind_usage(cx, last) { | ||
| cx.struct_span_lint(USAGE_OF_TY_TYKIND, span, "usage of `ty::TyKind::<kind>`") | ||
| .span_suggestion( | ||
| span, | ||
| "try using ty::<kind> directly", | ||
| "ty".to_string(), | ||
| Applicability::MaybeIncorrect, // ty maybe needs an import | ||
| ) | ||
| .emit(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn check_ty(&mut self, cx: &LateContext<'_, '_>, ty: &'tcx Ty) { | ||
| if let TyKind::Path(qpath) = &ty.node { | ||
| if let QPath::Resolved(_, path) = qpath { | ||
| if let Some(last) = path.segments.iter().last() { | ||
| if lint_ty_kind_usage(cx, last) { | ||
| cx.struct_span_lint(USAGE_OF_TY_TYKIND, path.span, "usage of `ty::TyKind`") | ||
| .help("try using `ty::Ty` instead") | ||
| .emit(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn lint_ty_kind_usage(cx: &LateContext<'_, '_>, segment: &PathSegment) -> bool { | ||
| if segment.ident.as_str() == "TyKind" { | ||
| if let Some(def) = segment.def { | ||
| if let Some(did) = def.opt_def_id() { | ||
| return did.match_path(cx.tcx, &["rustc", "ty", "sty", "TyKind"]); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| false | ||
| } |
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