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Auto merge of #86782 - flip1995:clippyup, r=Manishearth

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Update Clippy

Biweekly Clippy Update

r? `@Manishearth`
This commit is contained in:
bors 2021-07-02 02:56:45 +00:00
commit 7cd0643eb2
142 changed files with 3185 additions and 1086 deletions
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2
clippy_utils/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "clippy_utils"
version = "0.1.54"
version = "0.1.55"
authors = ["The Rust Clippy Developers"]
edition = "2018"
publish = false

11
clippy_utils/src/ast_utils.rs
View file

@ -47,9 +47,14 @@ pub fn eq_pat(l: &Pat, r: &Pat) -> bool {
| (Ref(l, Mutability::Mut), Ref(r, Mutability::Mut)) => eq_pat(l, r),
(Tuple(l), Tuple(r)) | (Slice(l), Slice(r)) => over(l, r, |l, r| eq_pat(l, r)),
(Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp),
(TupleStruct(lqself, lp, lfs), TupleStruct(rqself, rp, rfs)) => eq_maybe_qself(lqself, rqself) && eq_path(lp, rp) && over(lfs, rfs, |l, r| eq_pat(l, r)),
(TupleStruct(lqself, lp, lfs), TupleStruct(rqself, rp, rfs)) => {
eq_maybe_qself(lqself, rqself) && eq_path(lp, rp) && over(lfs, rfs, |l, r| eq_pat(l, r))
},
(Struct(lqself, lp, lfs, lr), Struct(rqself, rp, rfs, rr)) => {
lr == rr && eq_maybe_qself(lqself, rqself) &&eq_path(lp, rp) && unordered_over(lfs, rfs, |lf, rf| eq_field_pat(lf, rf))
lr == rr
&& eq_maybe_qself(lqself, rqself)
&& eq_path(lp, rp)
&& unordered_over(lfs, rfs, |lf, rf| eq_field_pat(lf, rf))
},
(Or(ls), Or(rs)) => unordered_over(ls, rs, |l, r| eq_pat(l, r)),
(MacCall(l), MacCall(r)) => eq_mac_call(l, r),
@ -82,7 +87,7 @@ pub fn eq_maybe_qself(l: &Option<QSelf>, r: &Option<QSelf>) -> bool {
match (l, r) {
(Some(l), Some(r)) => eq_qself(l, r),
(None, None) => true,
_ => false
_ => false,
}
}

5
clippy_utils/src/attrs.rs
View file

@ -157,3 +157,8 @@ pub fn is_doc_hidden(attrs: &[ast::Attribute]) -> bool {
.filter_map(ast::Attribute::meta_item_list)
.any(|l| attr::list_contains_name(&l, sym::hidden))
}
/// Return true if the attributes contain `#[unstable]`
pub fn is_unstable(attrs: &[ast::Attribute]) -> bool {
attrs.iter().any(|attr| attr.has_name(sym::unstable))
}

10
clippy_utils/src/consts.rs
View file

@ -1,6 +1,6 @@
#![allow(clippy::float_cmp)]
use crate::{clip, sext, unsext};
use crate::{clip, is_direct_expn_of, sext, unsext};
use if_chain::if_chain;
use rustc_ast::ast::{self, LitFloatType, LitKind};
use rustc_data_structures::sync::Lrc;
@ -230,7 +230,13 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
match e.kind {
ExprKind::Path(ref qpath) => self.fetch_path(qpath, e.hir_id, self.typeck_results.expr_ty(e)),
ExprKind::Block(block, _) => self.block(block),
ExprKind::Lit(ref lit) => Some(lit_to_constant(&lit.node, self.typeck_results.expr_ty_opt(e))),
ExprKind::Lit(ref lit) => {
if is_direct_expn_of(e.span, "cfg").is_some() {
None
} else {
Some(lit_to_constant(&lit.node, self.typeck_results.expr_ty_opt(e)))
}
},
ExprKind::Array(vec) => self.multi(vec).map(Constant::Vec),
ExprKind::Tup(tup) => self.multi(tup).map(Constant::Tuple),
ExprKind::Repeat(value, _) => {

106
clippy_utils/src/lib.rs
View file

@ -72,7 +72,7 @@ use rustc_hir::LangItem::{ResultErr, ResultOk};
use rustc_hir::{
def, Arm, BindingAnnotation, Block, Body, Constness, Destination, Expr, ExprKind, FnDecl, GenericArgs, HirId, Impl,
ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem, Local, MatchSource, Node, Param, Pat, PatKind, Path,
PathSegment, QPath, Stmt, StmtKind, TraitItem, TraitItemKind, TraitRef, TyKind,
PathSegment, QPath, Stmt, StmtKind, TraitItem, TraitItemKind, TraitRef, TyKind, UnOp,
};
use rustc_lint::{LateContext, Level, Lint, LintContext};
use rustc_middle::hir::exports::Export;
@ -326,16 +326,6 @@ pub fn is_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol)
.map_or(false, |did| is_diag_trait_item(cx, did, diag_item))
}
/// Checks if an expression references a variable of the given name.
pub fn match_var(expr: &Expr<'_>, var: Symbol) -> bool {
if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind {
if let [p] = path.segments {
return p.ident.name == var;
}
}
false
}
pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> {
match *path {
QPath::Resolved(_, path) => path.segments.last().expect("A path must have at least one segment"),
@ -707,16 +697,6 @@ pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Symbol> {
}
}
/// Gets the name of a `Pat`, if any.
pub fn get_pat_name(pat: &Pat<'_>) -> Option<Symbol> {
match pat.kind {
PatKind::Binding(.., ref spname, _) => Some(spname.name),
PatKind::Path(ref qpath) => single_segment_path(qpath).map(|ps| ps.ident.name),
PatKind::Box(p) | PatKind::Ref(p, _) => get_pat_name(&*p),
_ => None,
}
}
pub struct ContainsName {
pub name: Symbol,
pub result: bool,
@ -861,14 +841,16 @@ pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Optio
})
}
/// Gets the loop enclosing the given expression, if any.
pub fn get_enclosing_loop(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
/// Gets the loop or closure enclosing the given expression, if any.
pub fn get_enclosing_loop_or_closure(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
let map = tcx.hir();
for (_, node) in map.parent_iter(expr.hir_id) {
match node {
Node::Expr(
e @ Expr {
kind: ExprKind::Loop(..),
e
@
Expr {
kind: ExprKind::Loop(..) | ExprKind::Closure(..),
..
},
) => return Some(e),
@ -1399,6 +1381,55 @@ pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
did.map_or(false, |did| must_use_attr(cx.tcx.get_attrs(did)).is_some())
}
/// Checks if an expression represents the identity function
/// Only examines closures and `std::convert::identity`
pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
/// Checks if a function's body represents the identity function. Looks for bodies of the form:
/// * `|x| x`
/// * `|x| return x`
/// * `|x| { return x }`
/// * `|x| { return x; }`
fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
let id = if_chain! {
if let [param] = func.params;
if let PatKind::Binding(_, id, _, _) = param.pat.kind;
then {
id
} else {
return false;
}
};
let mut expr = &func.value;
loop {
match expr.kind {
#[rustfmt::skip]
ExprKind::Block(&Block { stmts: [], expr: Some(e), .. }, _, )
| ExprKind::Ret(Some(e)) => expr = e,
#[rustfmt::skip]
ExprKind::Block(&Block { stmts: [stmt], expr: None, .. }, _) => {
if_chain! {
if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
if let ExprKind::Ret(Some(ret_val)) = e.kind;
then {
expr = ret_val;
} else {
return false;
}
}
},
_ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
}
}
}
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,
}
}
/// 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: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
let map = tcx.hir();
@ -1654,6 +1685,19 @@ pub fn peel_hir_expr_refs(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
(e, 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> {
loop {
match expr.kind {
ExprKind::AddrOf(_, _, e) => expr = e,
ExprKind::Unary(UnOp::Deref, e) if cx.typeck_results().expr_ty(e).is_ref() => expr = e,
_ => break,
}
}
expr
}
#[macro_export]
macro_rules! unwrap_cargo_metadata {
($cx: ident, $lint: ident, $deps: expr) => {{
@ -1683,3 +1727,15 @@ pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
}
}
}
/// Checks whether item either has `test` attribute applied, or
/// is a module with `test` in its name.
pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
if let Some(def_id) = tcx.hir().opt_local_def_id(item.hir_id()) {
if tcx.has_attr(def_id.to_def_id(), sym::test) {
return true;
}
}
matches!(item.kind, ItemKind::Mod(..)) && item.ident.name.as_str().contains("test")
}

32
clippy_utils/src/ptr.rs
View file

@ -1,10 +1,10 @@
use crate::source::snippet;
use crate::{get_pat_name, match_var};
use crate::{path_to_local_id, strip_pat_refs};
use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
use rustc_hir::{Body, BodyId, Expr, ExprKind, Param};
use rustc_hir::{Body, BodyId, Expr, ExprKind, HirId, PatKind};
use rustc_lint::LateContext;
use rustc_middle::hir::map::Map;
use rustc_span::{Span, Symbol};
use rustc_span::Span;
use std::borrow::Cow;
pub fn get_spans(
@ -14,10 +14,11 @@ pub fn get_spans(
replacements: &[(&'static str, &'static str)],
) -> Option<Vec<(Span, Cow<'static, str>)>> {
if let Some(body) = opt_body_id.map(|id| cx.tcx.hir().body(id)) {
get_binding_name(&body.params[idx]).map_or_else(
|| Some(vec![]),
|name| extract_clone_suggestions(cx, name, replacements, body),
)
if let PatKind::Binding(_, binding_id, _, _) = strip_pat_refs(body.params[idx].pat).kind {
extract_clone_suggestions(cx, binding_id, replacements, body)
} else {
Some(vec![])
}
} else {
Some(vec![])
}
@ -25,13 +26,13 @@ pub fn get_spans(
fn extract_clone_suggestions<'tcx>(
cx: &LateContext<'tcx>,
name: Symbol,
id: HirId,
replace: &[(&'static str, &'static str)],
body: &'tcx Body<'_>,
) -> Option<Vec<(Span, Cow<'static, str>)>> {
let mut visitor = PtrCloneVisitor {
cx,
name,
id,
replace,
spans: vec![],
abort: false,
@ -42,7 +43,7 @@ fn extract_clone_suggestions<'tcx>(
struct PtrCloneVisitor<'a, 'tcx> {
cx: &'a LateContext<'tcx>,
name: Symbol,
id: HirId,
replace: &'a [(&'static str, &'static str)],
spans: Vec<(Span, Cow<'static, str>)>,
abort: bool,
@ -55,16 +56,15 @@ impl<'a, 'tcx> Visitor<'tcx> for PtrCloneVisitor<'a, 'tcx> {
if self.abort {
return;
}
if let ExprKind::MethodCall(seg, _, args, _) = expr.kind {
if args.len() == 1 && match_var(&args[0], self.name) {
if let ExprKind::MethodCall(seg, _, [recv], _) = expr.kind {
if path_to_local_id(recv, self.id) {
if seg.ident.name.as_str() == "capacity" {
self.abort = true;
return;
}
for &(fn_name, suffix) in self.replace {
if seg.ident.name.as_str() == fn_name {
self.spans
.push((expr.span, snippet(self.cx, args[0].span, "_") + suffix));
self.spans.push((expr.span, snippet(self.cx, recv.span, "_") + suffix));
return;
}
}
@ -77,7 +77,3 @@ impl<'a, 'tcx> Visitor<'tcx> for PtrCloneVisitor<'a, 'tcx> {
NestedVisitorMap::None
}
}
fn get_binding_name(arg: &Param<'_>) -> Option<Symbol> {
get_pat_name(arg.pat)
}