+#![feature(array_chunks)]
#![feature(box_patterns)]
#![feature(control_flow_enum)]
#![feature(let_else)]
+#![feature(lint_reasons)]
#![feature(once_cell)]
#![feature(rustc_private)]
#![recursion_limit = "512"]
#[macro_use]
pub mod sym_helper;
-#[allow(clippy::module_name_repetitions)]
pub mod ast_utils;
pub mod attrs;
+mod check_proc_macro;
pub mod comparisons;
pub mod consts;
pub mod diagnostics;
pub mod visitors;
pub use self::attrs::*;
-pub use self::hir_utils::{both, count_eq, eq_expr_value, over, SpanlessEq, SpanlessHash};
+pub use self::check_proc_macro::{is_from_proc_macro, is_span_if, is_span_match};
+pub use self::hir_utils::{
+ both, count_eq, eq_expr_value, hash_expr, hash_stmt, over, HirEqInterExpr, SpanlessEq, SpanlessHash,
+};
use std::collections::hash_map::Entry;
use std::hash::BuildHasherDefault;
-use std::lazy::SyncOnceCell;
+use std::sync::OnceLock;
use std::sync::{Mutex, MutexGuard};
use if_chain::if_chain;
-use rustc_ast::ast::{self, Attribute, LitKind};
+use rustc_ast::ast::{self, LitKind};
+use rustc_ast::Attribute;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unhash::UnhashMap;
use rustc_hir as hir;
use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID};
use rustc_hir::hir_id::{HirIdMap, HirIdSet};
use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
-use rustc_hir::itemlikevisit::ItemLikeVisitor;
use rustc_hir::LangItem::{OptionNone, ResultErr, ResultOk};
use rustc_hir::{
- def, lang_items, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Constness, Destination, Expr,
- ExprKind, FnDecl, ForeignItem, GenericArgs, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem,
- Local, MatchSource, Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind,
- Target, TraitItem, TraitItemKind, TraitRef, TyKind, UnOp,
+ def, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Closure, Constness, Destination, Expr,
+ ExprKind, FnDecl, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem, Local, MatchSource,
+ Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, TraitItem, TraitItemKind,
+ TraitRef, TyKind, UnOp,
};
use rustc_lint::{LateContext, Level, Lint, LintContext};
use rustc_middle::hir::place::PlaceBase;
use rustc_middle::ty as rustc_ty;
use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
use rustc_middle::ty::binding::BindingMode;
-use rustc_middle::ty::{layout::IntegerExt, BorrowKind, DefIdTree, Ty, TyCtxt, TypeAndMut, TypeFoldable, UpvarCapture};
+use rustc_middle::ty::fast_reject::SimplifiedTypeGen::{
+ ArraySimplifiedType, BoolSimplifiedType, CharSimplifiedType, FloatSimplifiedType, IntSimplifiedType,
+ PtrSimplifiedType, SliceSimplifiedType, StrSimplifiedType, UintSimplifiedType,
+};
+use rustc_middle::ty::{
+ layout::IntegerExt, BorrowKind, ClosureKind, DefIdTree, Ty, TyCtxt, TypeAndMut, TypeVisitable, UpvarCapture,
+};
+use rustc_middle::ty::{FloatTy, IntTy, UintTy};
use rustc_semver::RustcVersion;
use rustc_session::Session;
use rustc_span::hygiene::{ExpnKind, MacroKind};
use rustc_target::abi::Integer;
use crate::consts::{constant, Constant};
-use crate::ty::{can_partially_move_ty, is_copy, is_recursively_primitive_type};
+use crate::ty::{can_partially_move_ty, expr_sig, is_copy, is_recursively_primitive_type, ty_is_fn_once_param};
use crate::visitors::expr_visitor_no_bodies;
pub fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Option<RustcVersion> {
None
}
-pub fn meets_msrv(msrv: Option<&RustcVersion>, lint_msrv: &RustcVersion) -> bool {
- msrv.map_or(true, |msrv| msrv.meets(*lint_msrv))
+pub fn meets_msrv(msrv: Option<RustcVersion>, lint_msrv: RustcVersion) -> bool {
+ msrv.map_or(true, |msrv| msrv.meets(lint_msrv))
}
#[macro_export]
macro_rules! extract_msrv_attr {
- (LateContext) => {
- extract_msrv_attr!(@LateContext, ());
- };
- (EarlyContext) => {
- extract_msrv_attr!(@EarlyContext);
- };
- (@$context:ident$(, $call:tt)?) => {
+ ($context:ident) => {
fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
- use $crate::get_unique_inner_attr;
- match get_unique_inner_attr(cx.sess$($call)?, attrs, "msrv") {
+ let sess = rustc_lint::LintContext::sess(cx);
+ match $crate::get_unique_inner_attr(sess, attrs, "msrv") {
Some(msrv_attr) => {
if let Some(msrv) = msrv_attr.value_str() {
- self.msrv = $crate::parse_msrv(
- &msrv.to_string(),
- Some(cx.sess$($call)?),
- Some(msrv_attr.span),
- );
+ self.msrv = $crate::parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
} else {
- cx.sess$($call)?.span_err(msrv_attr.span, "bad clippy attribute");
+ sess.span_err(msrv_attr.span, "bad clippy attribute");
}
},
_ => (),
};
}
-/// Returns `true` if the two spans come from differing expansions (i.e., one is
-/// from a macro and one isn't).
-#[must_use]
-pub fn differing_macro_contexts(lhs: Span, rhs: Span) -> bool {
- rhs.ctxt() != lhs.ctxt()
-}
-
/// If the given expression is a local binding, find the initializer expression.
/// If that initializer expression is another local binding, find its initializer again.
/// This process repeats as long as possible (but usually no more than once). Initializer
pub fn find_binding_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
let hir = cx.tcx.hir();
if_chain! {
- if let Some(Node::Binding(pat)) = hir.find(hir_id);
+ if let Some(Node::Pat(pat)) = hir.find(hir_id);
if matches!(pat.kind, PatKind::Binding(BindingAnnotation::Unannotated, ..));
let parent = hir.get_parent_node(hir_id);
if let Some(Node::Local(local)) = hir.find(parent);
if let QPath::Resolved(_, path) = qpath {
if let Res::Def(DefKind::Ctor(..), ctor_id) = path.res {
if let Ok(item_id) = cx.tcx.lang_items().require(lang_item) {
- return cx.tcx.parent(ctor_id) == Some(item_id);
+ return cx.tcx.parent(ctor_id) == item_id;
}
}
}
matches!(pat.kind, PatKind::Wild)
}
-/// Checks if the first type parameter is a lang item.
-pub fn is_ty_param_lang_item<'tcx>(
- cx: &LateContext<'_>,
- qpath: &QPath<'tcx>,
- item: LangItem,
-) -> Option<&'tcx hir::Ty<'tcx>> {
- let ty = get_qpath_generic_tys(qpath).next()?;
-
- if let TyKind::Path(qpath) = &ty.kind {
- cx.qpath_res(qpath, ty.hir_id)
- .opt_def_id()
- .map_or(false, |id| {
- cx.tcx.lang_items().require(item).map_or(false, |lang_id| id == lang_id)
- })
- .then(|| ty)
- } else {
- None
- }
-}
-
-/// Checks if the first type parameter is a diagnostic item.
-pub fn is_ty_param_diagnostic_item<'tcx>(
- cx: &LateContext<'_>,
- qpath: &QPath<'tcx>,
- item: Symbol,
-) -> Option<&'tcx hir::Ty<'tcx>> {
- let ty = get_qpath_generic_tys(qpath).next()?;
-
- if let TyKind::Path(qpath) = &ty.kind {
- cx.qpath_res(qpath, ty.hir_id)
- .opt_def_id()
- .map_or(false, |id| cx.tcx.is_diagnostic_item(item, id))
- .then(|| ty)
- } else {
- None
- }
-}
-
/// Checks if the method call given in `expr` belongs to the given trait.
/// This is a deprecated function, consider using [`is_trait_method`].
pub fn match_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, path: &[&str]) -> bool {
pub fn is_diag_item_method(cx: &LateContext<'_>, def_id: DefId, diag_item: Symbol) -> bool {
if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
- return cx.tcx.is_diagnostic_item(diag_item, adt.did);
+ return cx.tcx.is_diagnostic_item(diag_item, adt.did());
}
}
false
}
}
-pub fn get_qpath_generics<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>> {
- match path {
- QPath::Resolved(_, p) => p.segments.last().and_then(|s| s.args),
- QPath::TypeRelative(_, s) => s.args,
- QPath::LangItem(..) => None,
- }
-}
-
-pub fn get_qpath_generic_tys<'tcx>(path: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
- get_qpath_generics(path)
- .map_or([].as_ref(), |a| a.args)
+pub fn qpath_generic_tys<'tcx>(qpath: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
+ last_path_segment(qpath)
+ .args
+ .map_or(&[][..], |a| a.args)
.iter()
- .filter_map(|a| {
- if let hir::GenericArg::Type(ty) = a {
- Some(ty)
- } else {
- None
- }
+ .filter_map(|a| match a {
+ hir::GenericArg::Type(ty) => Some(ty),
+ _ => None,
})
}
-pub fn single_segment_path<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx PathSegment<'tcx>> {
- match *path {
- QPath::Resolved(_, path) => path.segments.get(0),
- QPath::TypeRelative(_, seg) => Some(seg),
- QPath::LangItem(..) => None,
- }
-}
-
/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
/// entire path or resolved `DefId`. Prefer using `match_def_path`. Consider getting a `DefId` from
/// `QPath::Resolved.1.res.opt_def_id()`.
}
}
-/// If the expression is a path, resolve it. Otherwise, return `Res::Err`.
-pub fn expr_path_res(cx: &LateContext<'_>, expr: &Expr<'_>) -> Res {
- if let ExprKind::Path(p) = &expr.kind {
- cx.qpath_res(p, expr.hir_id)
- } else {
- Res::Err
- }
-}
-
-/// Resolves the path to a `DefId` and checks if it matches the given path.
-pub fn is_qpath_def_path(cx: &LateContext<'_>, path: &QPath<'_>, hir_id: HirId, segments: &[&str]) -> bool {
- cx.qpath_res(path, hir_id)
- .opt_def_id()
- .map_or(false, |id| match_def_path(cx, id, segments))
-}
-
/// If the expression is a path, resolves it to a `DefId` and checks if it matches the given path.
///
/// Please use `is_expr_diagnostic_item` if the target is a diagnostic item.
pub fn is_expr_path_def_path(cx: &LateContext<'_>, expr: &Expr<'_>, segments: &[&str]) -> bool {
- expr_path_res(cx, expr)
- .opt_def_id()
- .map_or(false, |id| match_def_path(cx, id, segments))
+ path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, segments))
}
/// If the expression is a path, resolves it to a `DefId` and checks if it matches the given
/// diagnostic item.
pub fn is_expr_diagnostic_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
- expr_path_res(cx, expr)
- .opt_def_id()
- .map_or(false, |id| cx.tcx.is_diagnostic_item(diag_item, id))
+ path_def_id(cx, expr).map_or(false, |id| cx.tcx.is_diagnostic_item(diag_item, id))
}
/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
path_to_local(expr) == Some(id)
}
-/// Gets the definition associated to a path.
-pub fn path_to_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
- macro_rules! try_res {
- ($e:expr) => {
- match $e {
- Some(e) => e,
- None => return Res::Err,
+pub trait MaybePath<'hir> {
+ fn hir_id(&self) -> HirId;
+ fn qpath_opt(&self) -> Option<&QPath<'hir>>;
+}
+
+macro_rules! maybe_path {
+ ($ty:ident, $kind:ident) => {
+ impl<'hir> MaybePath<'hir> for hir::$ty<'hir> {
+ fn hir_id(&self) -> HirId {
+ self.hir_id
}
- };
+ fn qpath_opt(&self) -> Option<&QPath<'hir>> {
+ match &self.kind {
+ hir::$kind::Path(qpath) => Some(qpath),
+ _ => None,
+ }
+ }
+ }
+ };
+}
+maybe_path!(Expr, ExprKind);
+maybe_path!(Pat, PatKind);
+maybe_path!(Ty, TyKind);
+
+/// If `maybe_path` is a path node, resolves it, otherwise returns `Res::Err`
+pub fn path_res<'tcx>(cx: &LateContext<'_>, maybe_path: &impl MaybePath<'tcx>) -> Res {
+ match maybe_path.qpath_opt() {
+ None => Res::Err,
+ Some(qpath) => cx.qpath_res(qpath, maybe_path.hir_id()),
}
+}
+
+/// If `maybe_path` is a path node which resolves to an item, retrieves the item ID
+pub fn path_def_id<'tcx>(cx: &LateContext<'_>, maybe_path: &impl MaybePath<'tcx>) -> Option<DefId> {
+ path_res(cx, maybe_path).opt_def_id()
+}
+
+/// Resolves a def path like `std::vec::Vec`.
+/// This function is expensive and should be used sparingly.
+pub fn def_path_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
fn item_child_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: &str) -> Option<Res> {
match tcx.def_kind(def_id) {
DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
_ => None,
}
}
- fn find_primitive(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
- if let Some(&(index, Target::Impl)) = lang_items::ITEM_REFS.get(&Symbol::intern(name)) {
- tcx.lang_items().items()[index]
- } else {
- None
+ fn find_primitive<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
+ let single = |ty| tcx.incoherent_impls(ty).iter().copied();
+ let empty = || [].iter().copied();
+ match name {
+ "bool" => single(BoolSimplifiedType),
+ "char" => single(CharSimplifiedType),
+ "str" => single(StrSimplifiedType),
+ "array" => single(ArraySimplifiedType),
+ "slice" => single(SliceSimplifiedType),
+ // FIXME: rustdoc documents these two using just `pointer`.
+ //
+ // Maybe this is something we should do here too.
+ "const_ptr" => single(PtrSimplifiedType(Mutability::Not)),
+ "mut_ptr" => single(PtrSimplifiedType(Mutability::Mut)),
+ "isize" => single(IntSimplifiedType(IntTy::Isize)),
+ "i8" => single(IntSimplifiedType(IntTy::I8)),
+ "i16" => single(IntSimplifiedType(IntTy::I16)),
+ "i32" => single(IntSimplifiedType(IntTy::I32)),
+ "i64" => single(IntSimplifiedType(IntTy::I64)),
+ "i128" => single(IntSimplifiedType(IntTy::I128)),
+ "usize" => single(UintSimplifiedType(UintTy::Usize)),
+ "u8" => single(UintSimplifiedType(UintTy::U8)),
+ "u16" => single(UintSimplifiedType(UintTy::U16)),
+ "u32" => single(UintSimplifiedType(UintTy::U32)),
+ "u64" => single(UintSimplifiedType(UintTy::U64)),
+ "u128" => single(UintSimplifiedType(UintTy::U128)),
+ "f32" => single(FloatSimplifiedType(FloatTy::F32)),
+ "f64" => single(FloatSimplifiedType(FloatTy::F64)),
+ _ => empty(),
}
}
fn find_crate(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
tcx.crates(())
.iter()
- .find(|&&num| tcx.crate_name(num).as_str() == name)
+ .copied()
+ .find(|&num| tcx.crate_name(num).as_str() == name)
.map(CrateNum::as_def_id)
}
_ => return Res::Err,
};
let tcx = cx.tcx;
- let first = try_res!(
- find_primitive(tcx, base)
- .or_else(|| find_crate(tcx, base))
- .and_then(|id| item_child_by_name(tcx, id, first))
- );
+ let starts = find_primitive(tcx, base)
+ .chain(find_crate(tcx, base))
+ .filter_map(|id| item_child_by_name(tcx, id, first));
- let last = path
- .iter()
- .copied()
- // for each segment, find the child item
- .try_fold(first, |res, segment| {
- let def_id = res.def_id();
- if let Some(item) = item_child_by_name(tcx, def_id, segment) {
- Some(item)
- } else if matches!(res, Res::Def(DefKind::Enum | DefKind::Struct, _)) {
- // it is not a child item so check inherent impl items
- tcx.inherent_impls(def_id)
- .iter()
- .find_map(|&impl_def_id| item_child_by_name(tcx, impl_def_id, segment))
- } else {
- None
- }
- });
- try_res!(last).expect_non_local()
+ for first in starts {
+ let last = path
+ .iter()
+ .copied()
+ // for each segment, find the child item
+ .try_fold(first, |res, segment| {
+ let def_id = res.def_id();
+ if let Some(item) = item_child_by_name(tcx, def_id, segment) {
+ Some(item)
+ } else if matches!(res, Res::Def(DefKind::Enum | DefKind::Struct, _)) {
+ // it is not a child item so check inherent impl items
+ tcx.inherent_impls(def_id)
+ .iter()
+ .find_map(|&impl_def_id| item_child_by_name(tcx, impl_def_id, segment))
+ } else {
+ None
+ }
+ });
+
+ if let Some(last) = last {
+ return last;
+ }
+ }
+
+ Res::Err
}
/// Convenience function to get the `DefId` of a trait by path.
/// It could be a trait or trait alias.
pub fn get_trait_def_id(cx: &LateContext<'_>, path: &[&str]) -> Option<DefId> {
- match path_to_res(cx, path) {
+ match def_path_res(cx, path) {
Res::Def(DefKind::Trait | DefKind::TraitAlias, trait_id) => Some(trait_id),
_ => None,
}
if parent_impl != CRATE_DEF_ID;
if let hir::Node::Item(item) = cx.tcx.hir().get_by_def_id(parent_impl);
if let hir::ItemKind::Impl(impl_) = &item.kind;
- then { return impl_.of_trait.as_ref(); }
+ then {
+ return impl_.of_trait.as_ref();
+ }
}
None
}
if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
return std_types_symbols
.iter()
- .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did));
+ .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did()));
}
}
}
if let Some(repl_def_id) = cx.qpath_res(repl_func_qpath, repl_func.hir_id).opt_def_id();
if is_diag_trait_item(cx, repl_def_id, sym::Default)
|| is_default_equivalent_ctor(cx, repl_def_id, repl_func_qpath);
- then {
- true
- }
- else {
- false
- }
+ then { true } else { false }
}
}
Node::Expr(e) => match e.kind {
ExprKind::AddrOf(_, mutability, _) => return CaptureKind::Ref(mutability),
ExprKind::Index(..) | ExprKind::Unary(UnOp::Deref, _) => capture = CaptureKind::Ref(Mutability::Not),
- ExprKind::Assign(lhs, ..) | ExprKind::Assign(_, lhs, _) if lhs.hir_id == child_id => {
+ ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) if lhs.hir_id == child_id => {
return CaptureKind::Ref(Mutability::Mut);
},
ExprKind::Field(..) => {
self.captures.entry(l).and_modify(|e| *e |= cap).or_insert(cap);
}
},
- ExprKind::Closure(..) => {
- let closure_id = self.cx.tcx.hir().local_def_id(e.hir_id).to_def_id();
+ ExprKind::Closure { .. } => {
+ let closure_id = self.cx.tcx.hir().local_def_id(e.hir_id);
for capture in self.cx.typeck_results().closure_min_captures_flattened(closure_id) {
let local_id = match capture.place.base {
PlaceBase::Local(id) => id,
captures: HirIdMap::default(),
};
v.visit_expr(expr);
- v.allow_closure.then(|| v.captures)
+ v.allow_closure.then_some(v.captures)
}
/// Returns the method names and argument list of nested method call expressions that make up
let mut current = expr;
for _ in 0..max_depth {
- if let ExprKind::MethodCall(path, span, args, _) = ¤t.kind {
+ if let ExprKind::MethodCall(path, args, _) = ¤t.kind {
if args.iter().any(|e| e.span.from_expansion()) {
break;
}
method_names.push(path.ident.name);
arg_lists.push(&**args);
- spans.push(*span);
+ spans.push(path.ident.span);
current = &args[0];
} else {
break;
let mut matched = Vec::with_capacity(methods.len());
for method_name in methods.iter().rev() {
// method chains are stored last -> first
- if let ExprKind::MethodCall(path, _, args, _) = current.kind {
+ if let ExprKind::MethodCall(path, args, _) = current.kind {
if path.ident.name.as_str() == *method_name {
if args.iter().any(|e| e.span.from_expansion()) {
return None;
let span = original_sp(span, DUMMY_SP);
let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
let line_no = source_map_and_line.line;
- let line_start = source_map_and_line.sf.lines[line_no];
+ let line_start = source_map_and_line.sf.lines(|lines| lines[line_no]);
span.with_lo(line_start)
}
}
/// Gets the loop or closure enclosing the given expression, if any.
-pub fn get_enclosing_loop_or_closure<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
- for (_, node) in tcx.hir().parent_iter(expr.hir_id) {
+pub fn get_enclosing_loop_or_multi_call_closure<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &Expr<'_>,
+) -> Option<&'tcx Expr<'tcx>> {
+ for (_, node) in cx.tcx.hir().parent_iter(expr.hir_id) {
match node {
- Node::Expr(
- e @ Expr {
- kind: ExprKind::Loop(..) | ExprKind::Closure(..),
- ..
+ Node::Expr(e) => match e.kind {
+ ExprKind::Closure { .. } => {
+ if let rustc_ty::Closure(_, subs) = cx.typeck_results().expr_ty(e).kind()
+ && subs.as_closure().kind() == ClosureKind::FnOnce
+ {
+ continue;
+ }
+ let is_once = walk_to_expr_usage(cx, e, |node, id| {
+ let Node::Expr(e) = node else {
+ return None;
+ };
+ match e.kind {
+ ExprKind::Call(f, _) if f.hir_id == id => Some(()),
+ ExprKind::Call(f, args) => {
+ let i = args.iter().position(|arg| arg.hir_id == id)?;
+ let sig = expr_sig(cx, f)?;
+ let predicates = sig
+ .predicates_id()
+ .map_or(cx.param_env, |id| cx.tcx.param_env(id))
+ .caller_bounds();
+ sig.input(i).and_then(|ty| {
+ ty_is_fn_once_param(cx.tcx, ty.skip_binder(), predicates).then_some(())
+ })
+ },
+ ExprKind::MethodCall(_, args, _) => {
+ let i = args.iter().position(|arg| arg.hir_id == id)?;
+ let id = cx.typeck_results().type_dependent_def_id(e.hir_id)?;
+ let ty = cx.tcx.fn_sig(id).skip_binder().inputs()[i];
+ ty_is_fn_once_param(cx.tcx, ty, cx.tcx.param_env(id).caller_bounds()).then_some(())
+ },
+ _ => None,
+ }
+ })
+ .is_some();
+ if !is_once {
+ return Some(e);
+ }
},
- ) => return Some(e),
- Node::Expr(_) | Node::Stmt(_) | Node::Block(_) | Node::Local(_) | Node::Arm(_) => (),
+ ExprKind::Loop(..) => return Some(e),
+ _ => (),
+ },
+ Node::Stmt(_) | Node::Block(_) | Node::Local(_) | Node::Arm(_) => (),
_ => break,
}
}
if is_integer_literal(e, value) {
return true;
}
- let enclosing_body = cx.tcx.hir().local_def_id(cx.tcx.hir().enclosing_body_owner(e.hir_id));
+ let enclosing_body = cx.tcx.hir().enclosing_body_owner(e.hir_id);
if let Some((Constant::Int(v), _)) = constant(cx, cx.tcx.typeck(enclosing_body), e) {
return value == v;
}
},
PatKind::Tuple(pats, _) => are_refutable(cx, pats),
PatKind::Struct(ref qpath, fields, _) => {
- is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, fields.iter().map(|field| &*field.pat))
+ is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, fields.iter().map(|field| field.pat))
},
PatKind::TupleStruct(ref qpath, pats, _) => is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, pats),
PatKind::Slice(head, middle, tail) => {
}
}
-/// Checks for the `#[automatically_derived]` attribute all `#[derive]`d
-/// implementations have.
-pub fn is_automatically_derived(attrs: &[ast::Attribute]) -> bool {
- has_attr(attrs, sym::automatically_derived)
-}
-
pub fn is_self(slf: &Param<'_>) -> bool {
if let PatKind::Binding(.., name, _) = slf.pat.kind {
name.name == kw::SelfLower
pub fn is_self_ty(slf: &hir::Ty<'_>) -> bool {
if let TyKind::Path(QPath::Resolved(None, path)) = slf.kind {
- if let Res::SelfTy(..) = path.res {
+ if let Res::SelfTy { .. } = path.res {
return true;
}
}
if arms.len() == 2;
if arms[0].guard.is_none();
if arms[1].guard.is_none();
- if (is_ok(cx, &arms[0]) && is_err(cx, &arms[1])) ||
- (is_ok(cx, &arms[1]) && is_err(cx, &arms[0]));
+ if (is_ok(cx, &arms[0]) && is_err(cx, &arms[1])) || (is_ok(cx, &arms[1]) && is_err(cx, &arms[0]));
then {
return Some(expr);
}
None
}
-/// Returns `true` if the lint is allowed in the current context
+/// Returns `true` if the lint is allowed in the current context. This is useful for
+/// skipping long running code when it's unnecessary
///
-/// Useful for skipping long running code when it's unnecessary
+/// This function should check the lint level for the same node, that the lint will
+/// be emitted at. If the information is buffered to be emitted at a later point, please
+/// make sure to use `span_lint_hir` functions to emit the lint. This ensures that
+/// expectations at the checked nodes will be fulfilled.
pub fn is_lint_allowed(cx: &LateContext<'_>, lint: &'static Lint, id: HirId) -> bool {
cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow
}
Integer::from_int_ty(&tcx, ity).size().bits()
}
-#[allow(clippy::cast_possible_wrap)]
+#[expect(clippy::cast_possible_wrap)]
/// Turn a constant int byte representation into an i128
pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::IntTy) -> i128 {
let amt = 128 - int_bits(tcx, ity);
((u as i128) << amt) >> amt
}
-#[allow(clippy::cast_sign_loss)]
+#[expect(clippy::cast_sign_loss)]
/// clip unused bytes
pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: rustc_ty::IntTy) -> u128 {
let amt = 128 - int_bits(tcx, ity);
if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
if match_def_path(cx, fun_def_id, path);
then {
- return Some(args)
+ return Some(args);
}
};
None
/// Checks if the given `DefId` matches any of the paths. Returns the index of matching path, if
/// any.
///
-/// Please use `match_any_diagnostic_items` if the targets are all diagnostic items.
+/// Please use `tcx.get_diagnostic_name` if the targets are all diagnostic items.
pub fn match_any_def_paths(cx: &LateContext<'_>, did: DefId, paths: &[&[&str]]) -> Option<usize> {
let search_path = cx.get_def_path(did);
paths
.position(|p| p.iter().map(|x| Symbol::intern(x)).eq(search_path.iter().copied()))
}
-/// Checks if the given `DefId` matches any of provided diagnostic items. Returns the index of
-/// matching path, if any.
-pub fn match_any_diagnostic_items(cx: &LateContext<'_>, def_id: DefId, diag_items: &[Symbol]) -> Option<usize> {
- diag_items
- .iter()
- .position(|item| cx.tcx.is_diagnostic_item(*item, def_id))
-}
-
/// Checks if the given `DefId` matches the path.
pub fn match_def_path<'tcx>(cx: &LateContext<'tcx>, did: DefId, syms: &[&str]) -> bool {
// We should probably move to Symbols in Clippy as well rather than interning every time.
let mut blocks: Vec<&Block<'_>> = Vec::new();
while let Some(higher::IfOrIfLet { cond, then, r#else }) = higher::IfOrIfLet::hir(expr) {
- conds.push(&*cond);
+ conds.push(cond);
if let ExprKind::Block(block, _) = then.kind {
blocks.push(block);
} else {
/// Checks if the given function kind is an async function.
pub fn is_async_fn(kind: FnKind<'_>) -> bool {
- matches!(kind, FnKind::ItemFn(_, _, header, _) if header.asyncness == IsAsync::Async)
+ matches!(kind, FnKind::ItemFn(_, _, header) if header.asyncness == IsAsync::Async)
}
/// Peels away all the compiler generated code surrounding the body of an async function,
_,
&[
Expr {
- kind: ExprKind::Closure(_, _, body, _, _),
+ kind: ExprKind::Closure(&Closure { body, .. }),
..
},
],
None
}
-// Finds the `#[must_use]` attribute, if any
-pub fn must_use_attr(attrs: &[Attribute]) -> Option<&Attribute> {
- attrs.iter().find(|a| a.has_name(sym::must_use))
-}
-
// check if expr is calling method or function with #[must_use] attribute
pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
let did = match expr.kind {
None
}
},
- ExprKind::MethodCall(_, _, _, _) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
_ => None,
};
- did.map_or(false, |did| must_use_attr(cx.tcx.get_attrs(did)).is_some())
+ did.map_or(false, |did| cx.tcx.has_attr(did, sym::must_use))
}
/// Checks if an expression represents the identity function
}
match expr.kind {
- ExprKind::Closure(_, _, body_id, _, _) => is_body_identity_function(cx, cx.tcx.hir().body(body_id)),
- ExprKind::Path(ref path) => is_qpath_def_path(cx, path, expr.hir_id, &paths::CONVERT_IDENTITY),
- _ => false,
+ ExprKind::Closure(&Closure { body, .. }) => is_body_identity_function(cx, cx.tcx.hir().body(body)),
+ _ => path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, &paths::CONVERT_IDENTITY)),
}
}
/// Gets the node where an expression is either used, or it's type is unified with another branch.
-pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
+/// Returns both the node and the `HirId` of the closest child node.
+pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<(Node<'tcx>, HirId)> {
let mut child_id = expr.hir_id;
let mut iter = tcx.hir().parent_iter(child_id);
loop {
ExprKind::Match(_, [arm], _) if arm.hir_id == child_id => child_id = expr.hir_id,
ExprKind::Block(..) | ExprKind::DropTemps(_) => child_id = expr.hir_id,
ExprKind::If(_, then_expr, None) if then_expr.hir_id == child_id => break None,
- _ => break Some(Node::Expr(expr)),
+ _ => break Some((Node::Expr(expr), child_id)),
},
- Some((_, node)) => break Some(node),
+ Some((_, node)) => break Some((node, child_id)),
}
}
}
pub fn is_expr_used_or_unified(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
!matches!(
get_expr_use_or_unification_node(tcx, expr),
- None | Some(Node::Stmt(Stmt {
- kind: StmtKind::Expr(_)
- | StmtKind::Semi(_)
- | StmtKind::Local(Local {
- pat: Pat {
- kind: PatKind::Wild,
+ None | Some((
+ Node::Stmt(Stmt {
+ kind: StmtKind::Expr(_)
+ | StmtKind::Semi(_)
+ | StmtKind::Local(Local {
+ pat: Pat {
+ kind: PatKind::Wild,
+ ..
+ },
..
- },
- ..
- }),
- ..
- }))
+ }),
+ ..
+ }),
+ _
+ ))
)
}
..
},
..,
- ) => cx.typeck_results().qpath_res(qpath, *path_hir_id).opt_def_id(),
+ ) => {
+ // Only return Fn-like DefIds, not the DefIds of statics/consts/etc that contain or
+ // deref to fn pointers, dyn Fn, impl Fn - #8850
+ if let Res::Def(DefKind::Fn | DefKind::Ctor(..) | DefKind::AssocFn, id) =
+ cx.typeck_results().qpath_res(qpath, *path_hir_id)
+ {
+ Some(id)
+ } else {
+ None
+ }
+ },
_ => None,
}
}
let expr_type = cx.typeck_results().expr_ty_adjusted(expr);
let expr_kind = expr_type.kind();
let is_primitive = match expr_kind {
- rustc_ty::Slice(element_type) => is_recursively_primitive_type(element_type),
+ rustc_ty::Slice(element_type) => is_recursively_primitive_type(*element_type),
rustc_ty::Ref(_, inner_ty, _) if matches!(inner_ty.kind(), &rustc_ty::Slice(_)) => {
if let rustc_ty::Slice(element_type) = inner_ty.kind() {
- is_recursively_primitive_type(element_type)
+ is_recursively_primitive_type(*element_type)
} else {
unreachable!()
}
(e, count)
}
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_hir_ty_refs<'a>(mut ty: &'a hir::Ty<'a>) -> (&'a hir::Ty<'a>, usize) {
+ let mut count = 0;
+ loop {
+ match &ty.kind {
+ TyKind::Rptr(_, ref_ty) => {
+ ty = ref_ty.ty;
+ count += 1;
+ },
+ _ => break (ty, count),
+ }
+ }
+}
+
/// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is
/// dereferenced. An overloaded deref such as `Vec` to slice would not be removed.
pub fn peel_ref_operators<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -> &'hir Expr<'hir> {
expr
}
-#[macro_export]
-macro_rules! unwrap_cargo_metadata {
- ($cx: ident, $lint: ident, $deps: expr) => {{
- let mut command = cargo_metadata::MetadataCommand::new();
- if !$deps {
- command.no_deps();
- }
-
- match command.exec() {
- Ok(metadata) => metadata,
- Err(err) => {
- span_lint($cx, $lint, DUMMY_SP, &format!("could not read cargo metadata: {}", err));
- return;
- },
- }
- }};
-}
-
pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
if let Res::Def(_, def_id) = path.res {
false
}
-struct TestItemNamesVisitor<'tcx> {
- tcx: TyCtxt<'tcx>,
- names: Vec<Symbol>,
-}
-
-impl<'hir> ItemLikeVisitor<'hir> for TestItemNamesVisitor<'hir> {
- fn visit_item(&mut self, item: &Item<'_>) {
- if let ItemKind::Const(ty, _body) = item.kind {
- if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
- // We could also check for the type name `test::TestDescAndFn`
- if let Res::Def(DefKind::Struct, _) = path.res {
- let has_test_marker = self
- .tcx
- .hir()
- .attrs(item.hir_id())
- .iter()
- .any(|a| a.has_name(sym::rustc_test_marker));
- if has_test_marker {
- self.names.push(item.ident.name);
- }
- }
- }
- }
- }
- fn visit_trait_item(&mut self, _: &TraitItem<'_>) {}
- fn visit_impl_item(&mut self, _: &ImplItem<'_>) {}
- fn visit_foreign_item(&mut self, _: &ForeignItem<'_>) {}
-}
-
-static TEST_ITEM_NAMES_CACHE: SyncOnceCell<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = SyncOnceCell::new();
+static TEST_ITEM_NAMES_CACHE: OnceLock<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = OnceLock::new();
-fn with_test_item_names<'tcx>(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
+fn with_test_item_names(tcx: TyCtxt<'_>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));
let mut map: MutexGuard<'_, FxHashMap<LocalDefId, Vec<Symbol>>> = cache.lock().unwrap();
- match map.entry(module) {
+ let value = map.entry(module);
+ match value {
Entry::Occupied(entry) => f(entry.get()),
Entry::Vacant(entry) => {
- let mut visitor = TestItemNamesVisitor { tcx, names: Vec::new() };
- tcx.hir().visit_item_likes_in_module(module, &mut visitor);
- visitor.names.sort_unstable();
- f(&*entry.insert(visitor.names))
+ let mut names = Vec::new();
+ for id in tcx.hir().module_items(module) {
+ if matches!(tcx.def_kind(id.def_id), DefKind::Const)
+ && let item = tcx.hir().item(id)
+ && let ItemKind::Const(ty, _body) = item.kind {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ // We could also check for the type name `test::TestDescAndFn`
+ if let Res::Def(DefKind::Struct, _) = path.res {
+ let has_test_marker = tcx
+ .hir()
+ .attrs(item.hir_id())
+ .iter()
+ .any(|a| a.has_name(sym::rustc_test_marker));
+ if has_test_marker {
+ names.push(item.ident.name);
+ }
+ }
+ }
+ }
+ }
+ names.sort_unstable();
+ f(entry.insert(names))
},
}
}
/// Checks if the function containing the given `HirId` is a `#[test]` function
///
-/// Note: If you use this function, please add a `#[test]` case in `tests/ui_test`.
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
with_test_item_names(tcx, tcx.parent_module(id), |names| {
tcx.hir()
})
}
+/// Checks if the item containing the given `HirId` has `#[cfg(test)]` attribute applied
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[cfg(test)]` function
+pub fn is_in_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ fn is_cfg_test(attr: &Attribute) -> bool {
+ if attr.has_name(sym::cfg)
+ && let Some(items) = attr.meta_item_list()
+ && let [item] = &*items
+ && item.has_name(sym::test)
+ {
+ true
+ } else {
+ false
+ }
+ }
+ tcx.hir()
+ .parent_iter(id)
+ .flat_map(|(parent_id, _)| tcx.hir().attrs(parent_id))
+ .any(is_cfg_test)
+}
+
/// Checks whether item either has `test` attribute applied, or
/// is a module with `test` in its name.
///
-/// Note: If you use this function, please add a `#[test]` case in `tests/ui_test`.
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
is_in_test_function(tcx, item.hir_id())
|| matches!(item.kind, ItemKind::Mod(..))
&& item.ident.name.as_str().split('_').any(|a| a == "test" || a == "tests")
}
+/// Walks the HIR tree from the given expression, up to the node where the value produced by the
+/// expression is consumed. Calls the function for every node encountered this way until it returns
+/// `Some`.
+///
+/// This allows walking through `if`, `match`, `break`, block expressions to find where the value
+/// produced by the expression is consumed.
+pub fn walk_to_expr_usage<'tcx, T>(
+ cx: &LateContext<'tcx>,
+ e: &Expr<'tcx>,
+ mut f: impl FnMut(Node<'tcx>, HirId) -> Option<T>,
+) -> Option<T> {
+ let map = cx.tcx.hir();
+ let mut iter = map.parent_iter(e.hir_id);
+ let mut child_id = e.hir_id;
+
+ while let Some((parent_id, parent)) = iter.next() {
+ if let Some(x) = f(parent, child_id) {
+ return Some(x);
+ }
+ let parent = match parent {
+ Node::Expr(e) => e,
+ Node::Block(Block { expr: Some(body), .. }) | Node::Arm(Arm { body, .. }) if body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ Node::Arm(a) if a.body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ _ => return None,
+ };
+ match parent.kind {
+ ExprKind::If(child, ..) | ExprKind::Match(child, ..) if child.hir_id != child_id => child_id = parent_id,
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _) => {
+ child_id = id;
+ iter = map.parent_iter(id);
+ },
+ ExprKind::Block(..) => child_id = parent_id,
+ _ => return None,
+ }
+ }
+ None
+}
+
macro_rules! op_utils {
($($name:ident $assign:ident)*) => {
/// Binary operation traits like `LangItem::Add`
projects / rust.git / blobdiff