Refactor for using config values:

* Construct lint passes by taking `Conf` by reference.
* Use `HashSet` configs in less places
* Move some `check_crate` code into the pass constructor when possible.

Author: Jarcho

book/src/development/adding_lints.md

@@ -458,9 +458,8 @@ pub struct ManualStrip {
 }
 
 impl ManualStrip {
-    #[must_use]
-    pub fn new(msrv: Msrv) -> Self {
-        Self { msrv }
+    pub fn new(conf: &'static Conf) -> Self {
+        Self { msrv: conf.msrv.clone() }
     }
 }
 ```
@@ -689,7 +688,6 @@ for some users. Adding a configuration is done in the following steps:
        ]);
 
        // New manual definition struct
-       #[derive(Copy, Clone)]
        pub struct StructName {}
 
        impl_lint_pass!(StructName => [
@@ -700,17 +698,16 @@ for some users. Adding a configuration is done in the following steps:
     2. Next add the configuration value and a corresponding creation method like
        this:
        ```rust
-       #[derive(Copy, Clone)]
        pub struct StructName {
            configuration_ident: Type,
        }
 
        // ...
 
        impl StructName {
-           pub fn new(configuration_ident: Type) -> Self {
+           pub fn new(conf: &'static Conf) -> Self {
                Self {
-                   configuration_ident,
+                   configuration_ident: conf.configuration_ident,
                }
            }
        }
@@ -726,8 +723,7 @@ for some users. Adding a configuration is done in the following steps:
    store.register_*_pass(|| box module::StructName);
 
    // New registration with configuration value
-   let configuration_ident = conf.configuration_ident.clone();
-   store.register_*_pass(move || box module::StructName::new(configuration_ident));
+   store.register_*_pass(move || box module::StructName::new(conf));
    ```
 
    Congratulations the work is almost done. The configuration value can now be

clippy_config/src/conf.rs

@@ -235,7 +235,7 @@ define_Conf! {
     ///
     /// A type, say `SomeType`, listed in this configuration has the same behavior of
     /// `["SomeType" , "*"], ["*", "SomeType"]` in `arithmetic_side_effects_allowed_binary`.
-    (arithmetic_side_effects_allowed: FxHashSet<String> = <_>::default()),
+    (arithmetic_side_effects_allowed: Vec<String> = <_>::default()),
     /// Lint: ARITHMETIC_SIDE_EFFECTS.
     ///
     /// Suppress checking of the passed type pair names in binary operations like addition or
@@ -262,7 +262,7 @@ define_Conf! {
     /// ```toml
     /// arithmetic-side-effects-allowed-unary = ["SomeType", "AnotherType"]
     /// ```
-    (arithmetic_side_effects_allowed_unary: FxHashSet<String> = <_>::default()),
+    (arithmetic_side_effects_allowed_unary: Vec<String> = <_>::default()),
     /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UNUSED_SELF, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX, UNNECESSARY_BOX_RETURNS, SINGLE_CALL_FN, NEEDLESS_PASS_BY_REF_MUT.
     ///
     /// Suppress lints whenever the suggested change would cause breakage for other crates.
@@ -311,7 +311,7 @@ define_Conf! {
     /// default configuration of Clippy. By default, any configuration will replace the default value. For example:
     /// * `doc-valid-idents = ["ClipPy"]` would replace the default list with `["ClipPy"]`.
     /// * `doc-valid-idents = ["ClipPy", ".."]` would append `ClipPy` to the default list.
-    (doc_valid_idents: Vec<String> = DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string).collect()),
+    (doc_valid_idents: FxHashSet<String> = DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string).collect()),
     /// Lint: TOO_MANY_ARGUMENTS.
     ///
     /// The maximum number of argument a function or method can have
@@ -547,7 +547,7 @@ define_Conf! {
     /// Lint: PATH_ENDS_WITH_EXT.
     ///
     /// Additional dotfiles (files or directories starting with a dot) to allow
-    (allowed_dotfiles: FxHashSet<String> = FxHashSet::default()),
+    (allowed_dotfiles: Vec<String> = Vec::default()),
     /// Lint: MULTIPLE_CRATE_VERSIONS.
     ///
     /// A list of crate names to allow duplicates of
@@ -700,7 +700,6 @@ pub fn lookup_conf_file() -> io::Result<(Option<PathBuf>, Vec<String>)> {
 fn deserialize(file: &SourceFile) -> TryConf {
     match toml::de::Deserializer::new(file.src.as_ref().unwrap()).deserialize_map(ConfVisitor(file)) {
         Ok(mut conf) => {
-            extend_vec_if_indicator_present(&mut conf.conf.doc_valid_idents, DEFAULT_DOC_VALID_IDENTS);
             extend_vec_if_indicator_present(&mut conf.conf.disallowed_names, DEFAULT_DISALLOWED_NAMES);
             extend_vec_if_indicator_present(&mut conf.conf.allowed_prefixes, DEFAULT_ALLOWED_PREFIXES);
             extend_vec_if_indicator_present(
@@ -713,6 +712,11 @@ fn deserialize(file: &SourceFile) -> TryConf {
                     .allowed_idents_below_min_chars
                     .extend(DEFAULT_ALLOWED_IDENTS_BELOW_MIN_CHARS.iter().map(ToString::to_string));
             }
+            if conf.conf.doc_valid_idents.contains("..") {
+                conf.conf
+                    .doc_valid_idents
+                    .extend(DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string));
+            }
 
             conf
         },

clippy_config/src/types.rs

@@ -2,13 +2,13 @@ use serde::de::{self, Deserializer, Visitor};
 use serde::{ser, Deserialize, Serialize};
 use std::fmt;
 
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Debug, Deserialize)]
 pub struct Rename {
     pub path: String,
     pub rename: String,
 }
 
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Debug, Deserialize)]
 #[serde(untagged)]
 pub enum DisallowedPath {
     Simple(String),
@@ -22,12 +22,10 @@ impl DisallowedPath {
         path
     }
 
-    pub fn reason(&self) -> Option<String> {
-        match self {
-            Self::WithReason {
-                reason: Some(reason), ..
-            } => Some(format!("{reason} (from clippy.toml)")),
-            _ => None,
+    pub fn reason(&self) -> Option<&str> {
+        match &self {
+            Self::WithReason { reason, .. } => reason.as_deref(),
+            Self::Simple(_) => None,
         }
     }
 }

clippy_dev/src/new_lint.rs

@@ -140,7 +140,7 @@ fn add_lint(lint: &LintData<'_>, enable_msrv: bool) -> io::Result<()> {
 
     let new_lint = if enable_msrv {
         format!(
-            "store.register_{lint_pass}_pass(move |{ctor_arg}| Box::new({module_name}::{camel_name}::new(msrv())));\n    ",
+            "store.register_{lint_pass}_pass(move |{ctor_arg}| Box::new({module_name}::{camel_name}::new(conf)));\n    ",
             lint_pass = lint.pass,
             ctor_arg = if lint.pass == "late" { "_" } else { "" },
             module_name = lint.name,
@@ -274,6 +274,7 @@ fn get_lint_file_contents(lint: &LintData<'_>, enable_msrv: bool) -> String {
         formatdoc!(
             r#"
             use clippy_config::msrvs::{{self, Msrv}};
+            use clippy_config::Conf;
             {pass_import}
             use rustc_lint::{{{context_import}, {pass_type}, LintContext}};
             use rustc_session::impl_lint_pass;
@@ -301,9 +302,8 @@ fn get_lint_file_contents(lint: &LintData<'_>, enable_msrv: bool) -> String {
             }}
 
             impl {name_camel} {{
-                #[must_use]
-                pub fn new(msrv: Msrv) -> Self {{
-                    Self {{ msrv }}
+                pub fn new(conf: &'static Conf) -> Self {{
+                    Self {{ msrv: conf.msrv.clone() }}
                 }}
             }}
 

clippy_lints/src/absolute_paths.rs

@@ -1,3 +1,4 @@
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::source::snippet_opt;
 use rustc_data_structures::fx::FxHashSet;
@@ -47,7 +48,16 @@ impl_lint_pass!(AbsolutePaths => [ABSOLUTE_PATHS]);
 
 pub struct AbsolutePaths {
     pub absolute_paths_max_segments: u64,
-    pub absolute_paths_allowed_crates: FxHashSet<String>,
+    pub absolute_paths_allowed_crates: &'static FxHashSet<String>,
+}
+
+impl AbsolutePaths {
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            absolute_paths_max_segments: conf.absolute_paths_max_segments,
+            absolute_paths_allowed_crates: &conf.absolute_paths_allowed_crates,
+        }
+    }
 }
 
 impl LateLintPass<'_> for AbsolutePaths {

clippy_lints/src/almost_complete_range.rs

@@ -1,4 +1,5 @@
 use clippy_config::msrvs::{self, Msrv};
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::{trim_span, walk_span_to_context};
 use rustc_ast::ast::{Expr, ExprKind, LitKind, Pat, PatKind, RangeEnd, RangeLimits};
@@ -34,8 +35,10 @@ pub struct AlmostCompleteRange {
     msrv: Msrv,
 }
 impl AlmostCompleteRange {
-    pub fn new(msrv: Msrv) -> Self {
-        Self { msrv }
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
     }
 }
 impl EarlyLintPass for AlmostCompleteRange {

clippy_lints/src/approx_const.rs

@@ -1,4 +1,5 @@
 use clippy_config::msrvs::{self, Msrv};
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_ast::ast::{FloatTy, LitFloatType, LitKind};
 use rustc_hir::{Expr, ExprKind};
@@ -67,9 +68,10 @@ pub struct ApproxConstant {
 }
 
 impl ApproxConstant {
-    #[must_use]
-    pub fn new(msrv: Msrv) -> Self {
-        Self { msrv }
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
     }
 
     fn check_lit(&self, cx: &LateContext<'_>, lit: &LitKind, e: &Expr<'_>) {

clippy_lints/src/assigning_clones.rs

@@ -1,4 +1,5 @@
 use clippy_config::msrvs::{self, Msrv};
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::mir::{enclosing_mir, PossibleBorrowerMap};
 use clippy_utils::sugg::Sugg;
@@ -57,9 +58,10 @@ pub struct AssigningClones {
 }
 
 impl AssigningClones {
-    #[must_use]
-    pub fn new(msrv: Msrv) -> Self {
-        Self { msrv }
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
     }
 }
 

clippy_lints/src/attrs/mod.rs

@@ -16,6 +16,7 @@ mod useless_attribute;
 mod utils;
 
 use clippy_config::msrvs::{self, Msrv};
+use clippy_config::Conf;
 use rustc_ast::{Attribute, MetaItemKind, NestedMetaItem};
 use rustc_hir::{ImplItem, Item, ItemKind, TraitItem};
 use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass};
@@ -499,7 +500,6 @@ declare_clippy_lint! {
     "duplicated attribute"
 }
 
-#[derive(Clone)]
 pub struct Attributes {
     msrv: Msrv,
 }
@@ -517,9 +517,10 @@ impl_lint_pass!(Attributes => [
 ]);
 
 impl Attributes {
-    #[must_use]
-    pub fn new(msrv: Msrv) -> Self {
-        Self { msrv }
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
     }
 }
 
@@ -589,7 +590,15 @@ impl<'tcx> LateLintPass<'tcx> for Attributes {
 }
 
 pub struct EarlyAttributes {
-    pub msrv: Msrv,
+    msrv: Msrv,
+}
+
+impl EarlyAttributes {
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
+    }
 }
 
 impl_lint_pass!(EarlyAttributes => [

clippy_lints/src/await_holding_invalid.rs

@@ -1,11 +1,11 @@
-use clippy_config::types::DisallowedPath;
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::{match_def_path, paths};
-use rustc_data_structures::fx::FxHashMap;
+use clippy_utils::{create_disallowed_map, match_def_path, paths};
 use rustc_hir as hir;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::{DefId, DefIdMap};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::CoroutineLayout;
+use rustc_middle::ty::TyCtxt;
 use rustc_session::impl_lint_pass;
 use rustc_span::{sym, Span};
 
@@ -172,31 +172,19 @@ declare_clippy_lint! {
 
 impl_lint_pass!(AwaitHolding => [AWAIT_HOLDING_LOCK, AWAIT_HOLDING_REFCELL_REF, AWAIT_HOLDING_INVALID_TYPE]);
 
-#[derive(Debug)]
 pub struct AwaitHolding {
-    conf_invalid_types: Vec<DisallowedPath>,
-    def_ids: FxHashMap<DefId, DisallowedPath>,
+    def_ids: DefIdMap<(&'static str, Option<&'static str>)>,
 }
 
 impl AwaitHolding {
-    pub(crate) fn new(conf_invalid_types: Vec<DisallowedPath>) -> Self {
+    pub(crate) fn new(tcx: TyCtxt<'_>, conf: &'static Conf) -> Self {
         Self {
-            conf_invalid_types,
-            def_ids: FxHashMap::default(),
+            def_ids: create_disallowed_map(tcx, &conf.await_holding_invalid_types),
         }
     }
 }
 
 impl<'tcx> LateLintPass<'tcx> for AwaitHolding {
-    fn check_crate(&mut self, cx: &LateContext<'tcx>) {
-        for conf in &self.conf_invalid_types {
-            let segs: Vec<_> = conf.path().split("::").collect();
-            for id in clippy_utils::def_path_def_ids(cx, &segs) {
-                self.def_ids.insert(id, conf.clone());
-            }
-        }
-    }
-
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
         if let hir::ExprKind::Closure(hir::Closure {
             kind: hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async, _)),
@@ -258,25 +246,22 @@ impl AwaitHolding {
                             );
                         },
                     );
-                } else if let Some(disallowed) = self.def_ids.get(&adt.did()) {
-                    emit_invalid_type(cx, ty_cause.source_info.span, disallowed);
+                } else if let Some(&(path, reason)) = self.def_ids.get(&adt.did()) {
+                    emit_invalid_type(cx, ty_cause.source_info.span, path, reason);
                 }
             }
         }
     }
 }
 
-fn emit_invalid_type(cx: &LateContext<'_>, span: Span, disallowed: &DisallowedPath) {
+fn emit_invalid_type(cx: &LateContext<'_>, span: Span, path: &'static str, reason: Option<&'static str>) {
     span_lint_and_then(
         cx,
         AWAIT_HOLDING_INVALID_TYPE,
         span,
-        format!(
-            "`{}` may not be held across an await point per `clippy.toml`",
-            disallowed.path()
-        ),
+        format!("holding a disallowed type across an await point `{path}`"),
         |diag| {
-            if let Some(reason) = disallowed.reason() {
+            if let Some(reason) = reason {
                 diag.note(reason);
             }
         },