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Auto merge of #5470 - flip1995:rollup-cvkuiza, r=flip1995

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Rollup of 5 pull requests

Successful merges:

 - #5226 (Add lint for explicit deref and deref_mut method calls)
 - #5248 (Add lint on large non scalar const)
 - #5430 (Disallow bit-shifting in integer_arithmetic)
 - #5466 (large_enum_variant: Report sizes of variants)
 - #5468 (Zero single char names)

Failed merges:

r? @ghost

changelog: rollup
This commit is contained in:
bors 2020-04-15 18:22:37 +00:00
commit 6651c1b9b2
21 changed files with 731 additions and 39 deletions
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2
CHANGELOG.md
View File

@ -1256,6 +1256,7 @@ Released 2018-09-13
[`expect_fun_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call
[`expl_impl_clone_on_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#expl_impl_clone_on_copy
[`explicit_counter_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[`explicit_deref_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_deref_methods
[`explicit_into_iter_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_into_iter_loop
[`explicit_iter_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_iter_loop
[`explicit_write`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_write
@ -1319,6 +1320,7 @@ Released 2018-09-13
[`iter_skip_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_skip_next
[`iterator_step_by_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iterator_step_by_zero
[`just_underscores_and_digits`]: https://rust-lang.github.io/rust-clippy/master/index.html#just_underscores_and_digits
[`large_const_arrays`]: https://rust-lang.github.io/rust-clippy/master/index.html#large_const_arrays
[`large_digit_groups`]: https://rust-lang.github.io/rust-clippy/master/index.html#large_digit_groups
[`large_enum_variant`]: https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant
[`large_stack_arrays`]: https://rust-lang.github.io/rust-clippy/master/index.html#large_stack_arrays

18
clippy_lints/src/arithmetic.rs
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@ -6,11 +6,17 @@
use rustc_span::source_map::Span;
declare_clippy_lint! {
/// **What it does:** Checks for plain integer arithmetic.
/// **What it does:** Checks for integer arithmetic operations which could overflow or panic.
///
/// **Why is this bad?** This is only checked against overflow in debug builds.
/// In some applications one wants explicitly checked, wrapping or saturating
/// arithmetic.
/// Specifically, checks for any operators (`+`, `-`, `*`, `<<`, etc) which are capable
/// of overflowing according to the [Rust
/// Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow),
/// or which can panic (`/`, `%`). No bounds analysis or sophisticated reasoning is
/// attempted.
///
/// **Why is this bad?** Integer overflow will trigger a panic in debug builds or will wrap in
/// release mode. Division by zero will cause a panic in either mode. In some applications one
/// wants explicitly checked, wrapping or saturating arithmetic.
///
/// **Known problems:** None.
///
@ -21,7 +27,7 @@
/// ```
pub INTEGER_ARITHMETIC,
restriction,
"any integer arithmetic statement"
"any integer arithmetic expression which could overflow or panic"
}
declare_clippy_lint! {
@ -71,8 +77,6 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr<'_>)
| hir::BinOpKind::BitAnd
| hir::BinOpKind::BitOr
| hir::BinOpKind::BitXor
| hir::BinOpKind::Shl
| hir::BinOpKind::Shr
| hir::BinOpKind::Eq
| hir::BinOpKind::Lt
| hir::BinOpKind::Le

113
clippy_lints/src/dereference.rs Normal file
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@ -0,0 +1,113 @@
use crate::utils::{get_parent_expr, implements_trait, snippet, span_lint_and_sugg};
use if_chain::if_chain;
use rustc_ast::util::parser::{ExprPrecedence, PREC_POSTFIX, PREC_PREFIX};
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::Span;
declare_clippy_lint! {
/// **What it does:** Checks for explicit `deref()` or `deref_mut()` method calls.
///
/// **Why is this bad?** Derefencing by `&*x` or `&mut *x` is clearer and more concise,
/// when not part of a method chain.
///
/// **Example:**
/// ```rust
/// use std::ops::Deref;
/// let a: &mut String = &mut String::from("foo");
/// let b: &str = a.deref();
/// ```
/// Could be written as:
/// ```rust
/// let a: &mut String = &mut String::from("foo");
/// let b = &*a;
/// ```
///
/// This lint excludes
/// ```rust,ignore
/// let _ = d.unwrap().deref();
/// ```
pub EXPLICIT_DEREF_METHODS,
pedantic,
"Explicit use of deref or deref_mut method while not in a method chain."
}
declare_lint_pass!(Dereferencing => [
EXPLICIT_DEREF_METHODS
]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Dereferencing {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
if_chain! {
if !expr.span.from_expansion();
if let ExprKind::MethodCall(ref method_name, _, ref args) = &expr.kind;
if args.len() == 1;
then {
if let Some(parent_expr) = get_parent_expr(cx, expr) {
// Check if we have the whole call chain here
if let ExprKind::MethodCall(..) = parent_expr.kind {
return;
}
// Check for Expr that we don't want to be linted
let precedence = parent_expr.precedence();
match precedence {
// Lint a Call is ok though
ExprPrecedence::Call | ExprPrecedence::AddrOf => (),
_ => {
if precedence.order() >= PREC_PREFIX && precedence.order() <= PREC_POSTFIX {
return;
}
}
}
}
let name = method_name.ident.as_str();
lint_deref(cx, &*name, &args[0], args[0].span, expr.span);
}
}
}
}
fn lint_deref(cx: &LateContext<'_, '_>, method_name: &str, call_expr: &Expr<'_>, var_span: Span, expr_span: Span) {
match method_name {
"deref" => {
if cx
.tcx
.lang_items()
.deref_trait()
.map_or(false, |id| implements_trait(cx, cx.tables.expr_ty(&call_expr), id, &[]))
{
span_lint_and_sugg(
cx,
EXPLICIT_DEREF_METHODS,
expr_span,
"explicit deref method call",
"try this",
format!("&*{}", &snippet(cx, var_span, "..")),
Applicability::MachineApplicable,
);
}
},
"deref_mut" => {
if cx
.tcx
.lang_items()
.deref_mut_trait()
.map_or(false, |id| implements_trait(cx, cx.tables.expr_ty(&call_expr), id, &[]))
{
span_lint_and_sugg(
cx,
EXPLICIT_DEREF_METHODS,
expr_span,
"explicit deref_mut method call",
"try this",
format!("&mut *{}", &snippet(cx, var_span, "..")),
Applicability::MachineApplicable,
);
}
},
_ => (),
}
}

85
clippy_lints/src/large_const_arrays.rs Normal file
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@ -0,0 +1,85 @@
use crate::rustc_target::abi::LayoutOf;
use crate::utils::span_lint_and_then;
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::{Item, ItemKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::mir::interpret::ConstValue;
use rustc_middle::ty::{self, ConstKind};
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::{BytePos, Pos, Span};
use rustc_typeck::hir_ty_to_ty;
declare_clippy_lint! {
/// **What it does:** Checks for large `const` arrays that should
/// be defined as `static` instead.
///
/// **Why is this bad?** Performance: const variables are inlined upon use.
/// Static items result in only one instance and has a fixed location in memory.
///
/// **Known problems:** None.
///
/// **Example:**
/// ```rust,ignore
/// // Bad
/// pub const a = [0u32; 1_000_000];
///
/// // Good
/// pub static a = [0u32; 1_000_000];
/// ```
pub LARGE_CONST_ARRAYS,
perf,
"large non-scalar const array may cause performance overhead"
}
pub struct LargeConstArrays {
maximum_allowed_size: u64,
}
impl LargeConstArrays {
#[must_use]
pub fn new(maximum_allowed_size: u64) -> Self {
Self { maximum_allowed_size }
}
}
impl_lint_pass!(LargeConstArrays => [LARGE_CONST_ARRAYS]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LargeConstArrays {
fn check_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx Item<'_>) {
if_chain! {
if !item.span.from_expansion();
if let ItemKind::Const(hir_ty, _) = &item.kind;
let ty = hir_ty_to_ty(cx.tcx, hir_ty);
if let ty::Array(element_type, cst) = ty.kind;
if let ConstKind::Value(val) = cst.val;
if let ConstValue::Scalar(element_count) = val;
if let Ok(element_count) = element_count.to_machine_usize(&cx.tcx);
if let Ok(element_size) = cx.layout_of(element_type).map(|l| l.size.bytes());
if self.maximum_allowed_size < element_count * element_size;
then {
let hi_pos = item.ident.span.lo() - BytePos::from_usize(1);
let sugg_span = Span::new(
hi_pos - BytePos::from_usize("const".len()),
hi_pos,
item.span.ctxt(),
);
span_lint_and_then(
cx,
LARGE_CONST_ARRAYS,
item.span,
"large array defined as const",
|db| {
db.span_suggestion(
sugg_span,
"make this a static item",
"static".to_string(),
Applicability::MachineApplicable,
);
}
);
}
}
}
}

25
clippy_lints/src/large_enum_variant.rs
View File

@ -21,11 +21,19 @@
/// measure the change this lint suggests.
///
/// **Example:**
///
/// ```rust
/// // Bad
/// enum Test {
/// A(i32),
/// B([i32; 8000]),
/// }
///
/// // Possibly better
/// enum Test2 {
/// A(i32),
/// B(Box<[i32; 8000]>),
/// }
/// ```
pub LARGE_ENUM_VARIANT,
perf,
@ -84,12 +92,21 @@ fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) {
if difference > self.maximum_size_difference_allowed {
let (i, variant) = largest.1;
let help_text = "consider boxing the large fields to reduce the total size of the enum";
span_lint_and_then(
cx,
LARGE_ENUM_VARIANT,
def.variants[i].span,
"large size difference between variants",
|db| {
db.span_label(
def.variants[(largest.1).0].span,
&format!("this variant is {} bytes", largest.0),
);
db.span_note(
def.variants[(second.1).0].span,
&format!("and the second-largest variant is {} bytes:", second.0),
);
if variant.fields.len() == 1 {
let span = match def.variants[i].data {
VariantData::Struct(ref fields, ..) | VariantData::Tuple(ref fields, ..) => {
@ -100,18 +117,14 @@ fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) {
if let Some(snip) = snippet_opt(cx, span) {
db.span_suggestion(
span,
"consider boxing the large fields to reduce the total size of the \
enum",
help_text,
format!("Box<{}>", snip),
Applicability::MaybeIncorrect,
);
return;
}
}
db.span_help(
def.variants[i].span,
"consider boxing the large fields to reduce the total size of the enum",
);
db.span_help(def.variants[i].span, help_text);
},
);
}

9
clippy_lints/src/lib.rs
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@ -191,6 +191,7 @@ macro_rules! declare_clippy_lint {
mod copy_iterator;
mod dbg_macro;
mod default_trait_access;
mod dereference;
mod derive;
mod doc;
mod double_comparison;
@ -231,6 +232,7 @@ macro_rules! declare_clippy_lint {
mod int_plus_one;
mod integer_division;
mod items_after_statements;
mod large_const_arrays;
mod large_enum_variant;
mod large_stack_arrays;
mod len_zero;
@ -513,6 +515,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
&copy_iterator::COPY_ITERATOR,
&dbg_macro::DBG_MACRO,
&default_trait_access::DEFAULT_TRAIT_ACCESS,
&dereference::EXPLICIT_DEREF_METHODS,
&derive::DERIVE_HASH_XOR_EQ,
&derive::EXPL_IMPL_CLONE_ON_COPY,
&doc::DOC_MARKDOWN,
@ -580,6 +583,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
&int_plus_one::INT_PLUS_ONE,
&integer_division::INTEGER_DIVISION,
&items_after_statements::ITEMS_AFTER_STATEMENTS,
&large_const_arrays::LARGE_CONST_ARRAYS,
&large_enum_variant::LARGE_ENUM_VARIANT,
&large_stack_arrays::LARGE_STACK_ARRAYS,
&len_zero::LEN_WITHOUT_IS_EMPTY,
@ -1024,6 +1028,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(|| box to_digit_is_some::ToDigitIsSome);
let array_size_threshold = conf.array_size_threshold;
store.register_late_pass(move || box large_stack_arrays::LargeStackArrays::new(array_size_threshold));
store.register_late_pass(move || box large_const_arrays::LargeConstArrays::new(array_size_threshold));
store.register_late_pass(move || box floating_point_arithmetic::FloatingPointArithmetic);
store.register_early_pass(|| box as_conversions::AsConversions);
store.register_early_pass(|| box utils::internal_lints::ProduceIce);
@ -1039,6 +1044,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(|| box verbose_file_reads::VerboseFileReads);
store.register_late_pass(|| box redundant_pub_crate::RedundantPubCrate::default());
store.register_late_pass(|| box unnamed_address::UnnamedAddress);
store.register_late_pass(|| box dereference::Dereferencing);
store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
LintId::of(&arithmetic::FLOAT_ARITHMETIC),
@ -1089,6 +1095,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&copies::SAME_FUNCTIONS_IN_IF_CONDITION),
LintId::of(&copy_iterator::COPY_ITERATOR),
LintId::of(&default_trait_access::DEFAULT_TRAIT_ACCESS),
LintId::of(&dereference::EXPLICIT_DEREF_METHODS),
LintId::of(&derive::EXPL_IMPL_CLONE_ON_COPY),
LintId::of(&doc::DOC_MARKDOWN),
LintId::of(&doc::MISSING_ERRORS_DOC),
@ -1221,6 +1228,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY),
LintId::of(&inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
LintId::of(&int_plus_one::INT_PLUS_ONE),
LintId::of(&large_const_arrays::LARGE_CONST_ARRAYS),
LintId::of(&large_enum_variant::LARGE_ENUM_VARIANT),
LintId::of(&len_zero::LEN_WITHOUT_IS_EMPTY),
LintId::of(&len_zero::LEN_ZERO),
@ -1652,6 +1660,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
LintId::of(&bytecount::NAIVE_BYTECOUNT),
LintId::of(&entry::MAP_ENTRY),
LintId::of(&escape::BOXED_LOCAL),
LintId::of(&large_const_arrays::LARGE_CONST_ARRAYS),
LintId::of(&large_enum_variant::LARGE_ENUM_VARIANT),
LintId::of(&loops::MANUAL_MEMCPY),
LintId::of(&loops::NEEDLESS_COLLECT),

2
clippy_lints/src/non_expressive_names.rs
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@ -93,7 +93,7 @@ impl<'a, 'tcx> SimilarNamesLocalVisitor<'a, 'tcx> {
fn check_single_char_names(&self) {
let num_single_char_names = self.single_char_names.iter().flatten().count();
let threshold = self.lint.single_char_binding_names_threshold;
if num_single_char_names as u64 >= threshold {
if num_single_char_names as u64 > threshold {
let span = self
.single_char_names
.iter()

4
clippy_lints/src/utils/conf.rs
View File

@ -135,7 +135,7 @@ fn $config() -> $Ty {
/// Lint: TYPE_COMPLEXITY. The maximum complexity a type can have
(type_complexity_threshold, "type_complexity_threshold": u64, 250),
/// Lint: MANY_SINGLE_CHAR_NAMES. The maximum number of single char bindings a scope may have
(single_char_binding_names_threshold, "single_char_binding_names_threshold": u64, 5),
(single_char_binding_names_threshold, "single_char_binding_names_threshold": u64, 4),
/// Lint: BOXED_LOCAL. The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
(too_large_for_stack, "too_large_for_stack": u64, 200),
/// Lint: ENUM_VARIANT_NAMES. The minimum number of enum variants for the lints about variant names to trigger
@ -150,7 +150,7 @@ fn $config() -> $Ty {
(trivial_copy_size_limit, "trivial_copy_size_limit": Option<u64>, None),
/// Lint: TOO_MANY_LINES. The maximum number of lines a function or method can have
(too_many_lines_threshold, "too_many_lines_threshold": u64, 100),
/// Lint: LARGE_STACK_ARRAYS. The maximum allowed size for arrays on the stack
/// Lint: LARGE_STACK_ARRAYS, LARGE_CONST_ARRAYS. The maximum allowed size for arrays on the stack
(array_size_threshold, "array_size_threshold": u64, 512_000),
/// Lint: VEC_BOX. The size of the boxed type in bytes, where boxing in a `Vec` is allowed
(vec_box_size_threshold, "vec_box_size_threshold": u64, 4096),

16
src/lintlist/mod.rs
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@ -528,6 +528,13 @@
deprecation: None,
module: "loops",
},
Lint {
name: "explicit_deref_methods",
group: "pedantic",
desc: "Explicit use of deref or deref_mut method while not in a method chain.",
deprecation: None,
module: "dereference",
},
Lint {
name: "explicit_into_iter_loop",
group: "pedantic",
@ -846,7 +853,7 @@
Lint {
name: "integer_arithmetic",
group: "restriction",
desc: "any integer arithmetic statement",
desc: "any integer arithmetic expression which could overflow or panic",
deprecation: None,
module: "arithmetic",
},
@ -941,6 +948,13 @@
deprecation: None,
module: "non_expressive_names",
},
Lint {
name: "large_const_arrays",
group: "perf",
desc: "large non-scalar const array may cause performance overhead",
deprecation: None,
module: "large_const_arrays",
},
Lint {
name: "large_digit_groups",
group: "pedantic",

1
tests/ui-toml/zero_single_char_names/clippy.toml Normal file
View File

@ -0,0 +1 @@
single-char-binding-names-threshold = 0

3
tests/ui-toml/zero_single_char_names/zero_single_char_names.rs Normal file
View File

@ -0,0 +1,3 @@
#![warn(clippy::many_single_char_names)]
fn main() {}

93
tests/ui/dereference.fixed Normal file
View File

@ -0,0 +1,93 @@
// run-rustfix
#![allow(unused_variables, clippy::many_single_char_names, clippy::clone_double_ref)]
#![warn(clippy::explicit_deref_methods)]
use std::ops::{Deref, DerefMut};
fn concat(deref_str: &str) -> String {
format!("{}bar", deref_str)
}
fn just_return(deref_str: &str) -> &str {
deref_str
}
struct CustomVec(Vec<u8>);
impl Deref for CustomVec {
type Target = Vec<u8>;
fn deref(&self) -> &Vec<u8> {
&self.0
}
}
fn main() {
let a: &mut String = &mut String::from("foo");
// these should require linting
let b: &str = &*a;
let b: &mut str = &mut *a;
// both derefs should get linted here
let b: String = format!("{}, {}", &*a, &*a);
println!("{}", &*a);
#[allow(clippy::match_single_binding)]
match &*a {
_ => (),
}
let b: String = concat(&*a);
let b = &*just_return(a);
let b: String = concat(&*just_return(a));
let b: &str = &*a.deref();
let opt_a = Some(a.clone());
let b = &*opt_a.unwrap();
// following should not require linting
let cv = CustomVec(vec![0, 42]);
let c = cv.deref()[0];
let b: &str = &*a.deref();
let b: String = a.deref().clone();
let b: usize = a.deref_mut().len();
let b: &usize = &a.deref().len();
let b: &str = &*a;
let b: &mut str = &mut *a;
macro_rules! expr_deref {
($body:expr) => {
$body.deref()
};
}
let b: &str = expr_deref!(a);
// The struct does not implement Deref trait
#[derive(Copy, Clone)]
struct NoLint(u32);
impl NoLint {
pub fn deref(self) -> u32 {
self.0
}
pub fn deref_mut(self) -> u32 {
self.0
}
}
let no_lint = NoLint(42);
let b = no_lint.deref();
let b = no_lint.deref_mut();
}

93
tests/ui/dereference.rs Normal file
View File

@ -0,0 +1,93 @@
// run-rustfix
#![allow(unused_variables, clippy::many_single_char_names, clippy::clone_double_ref)]
#![warn(clippy::explicit_deref_methods)]
use std::ops::{Deref, DerefMut};
fn concat(deref_str: &str) -> String {
format!("{}bar", deref_str)
}
fn just_return(deref_str: &str) -> &str {
deref_str
}
struct CustomVec(Vec<u8>);
impl Deref for CustomVec {
type Target = Vec<u8>;
fn deref(&self) -> &Vec<u8> {
&self.0
}
}
fn main() {
let a: &mut String = &mut String::from("foo");
// these should require linting
let b: &str = a.deref();
let b: &mut str = a.deref_mut();
// both derefs should get linted here
let b: String = format!("{}, {}", a.deref(), a.deref());
println!("{}", a.deref());
#[allow(clippy::match_single_binding)]
match a.deref() {
_ => (),
}
let b: String = concat(a.deref());
let b = just_return(a).deref();
let b: String = concat(just_return(a).deref());
let b: &str = a.deref().deref();
let opt_a = Some(a.clone());
let b = opt_a.unwrap().deref();
// following should not require linting
let cv = CustomVec(vec![0, 42]);
let c = cv.deref()[0];
let b: &str = &*a.deref();
let b: String = a.deref().clone();
let b: usize = a.deref_mut().len();
let b: &usize = &a.deref().len();
let b: &str = &*a;
let b: &mut str = &mut *a;
macro_rules! expr_deref {
($body:expr) => {
$body.deref()
};
}
let b: &str = expr_deref!(a);
// The struct does not implement Deref trait
#[derive(Copy, Clone)]
struct NoLint(u32);
impl NoLint {
pub fn deref(self) -> u32 {
self.0
}
pub fn deref_mut(self) -> u32 {
self.0
}
}
let no_lint = NoLint(42);
let b = no_lint.deref();
let b = no_lint.deref_mut();
}

70
tests/ui/dereference.stderr Normal file
View File

@ -0,0 +1,70 @@
error: explicit deref method call
--> $DIR/dereference.rs:30:19
|
LL | let b: &str = a.deref();
| ^^^^^^^^^ help: try this: `&*a`
|
= note: `-D clippy::explicit-deref-methods` implied by `-D warnings`
error: explicit deref_mut method call
--> $DIR/dereference.rs:32:23
|
LL | let b: &mut str = a.deref_mut();
| ^^^^^^^^^^^^^ help: try this: `&mut *a`
error: explicit deref method call
--> $DIR/dereference.rs:35:39
|
LL | let b: String = format!("{}, {}", a.deref(), a.deref());
| ^^^^^^^^^ help: try this: `&*a`
error: explicit deref method call
--> $DIR/dereference.rs:35:50
|
LL | let b: String = format!("{}, {}", a.deref(), a.deref());
| ^^^^^^^^^ help: try this: `&*a`
error: explicit deref method call
--> $DIR/dereference.rs:37:20
|
LL | println!("{}", a.deref());
| ^^^^^^^^^ help: try this: `&*a`
error: explicit deref method call
--> $DIR/dereference.rs:40:11
|
LL | match a.deref() {
| ^^^^^^^^^ help: try this: `&*a`
error: explicit deref method call
--> $DIR/dereference.rs:44:28
|
LL | let b: String = concat(a.deref());
| ^^^^^^^^^ help: try this: `&*a`
error: explicit deref method call
--> $DIR/dereference.rs:46:13
|
LL | let b = just_return(a).deref();
| ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&*just_return(a)`
error: explicit deref method call
--> $DIR/dereference.rs:48:28
|
LL | let b: String = concat(just_return(a).deref());
| ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&*just_return(a)`
error: explicit deref method call
--> $DIR/dereference.rs:50:19
|
LL | let b: &str = a.deref().deref();
| ^^^^^^^^^^^^^^^^^ help: try this: `&*a.deref()`
error: explicit deref method call
--> $DIR/dereference.rs:53:13
|
LL | let b = opt_a.unwrap().deref();
| ^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&*opt_a.unwrap()`
error: aborting due to 11 previous errors

10
tests/ui/integer_arithmetic.rs
View File

@ -17,6 +17,8 @@ fn main() {
i / 2; // no error, this is part of the expression in the preceding line
i - 2 + 2 - i;
-i;
i >> 1;
i << 1;
// no error, overflows are checked by `overflowing_literals`
-1;
@ -25,18 +27,16 @@ fn main() {
i & 1; // no wrapping
i | 1;
i ^ 1;
i >> 1;
i << 1;
i += 1;
i -= 1;
i *= 2;
i /= 2;
i %= 2;
// no errors
i <<= 3;
i >>= 2;
// no errors
i |= 1;
i &= 1;
i ^= i;
@ -72,8 +72,6 @@ fn foo() {}
1 + 1
};
}
}
// warn on references as well! (#5328)

40
tests/ui/integer_arithmetic.stderr
View File

@ -31,6 +31,18 @@ error: integer arithmetic detected
LL | -i;
| ^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:20:5
|
LL | i >> 1;
| ^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:21:5
|
LL | i << 1;
| ^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:31:5
|
@ -62,46 +74,58 @@ LL | i %= 2;
| ^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:81:5
--> $DIR/integer_arithmetic.rs:36:5
|
LL | i <<= 3;
| ^^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:37:5
|
LL | i >>= 2;
| ^^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:79:5
|
LL | 3 + &1;
| ^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:82:5
--> $DIR/integer_arithmetic.rs:80:5
|
LL | &3 + 1;
| ^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:83:5
--> $DIR/integer_arithmetic.rs:81:5
|
LL | &3 + &1;
| ^^^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:88:5
--> $DIR/integer_arithmetic.rs:86:5
|
LL | a + x
| ^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:92:5
--> $DIR/integer_arithmetic.rs:90:5
|
LL | x + y
| ^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:96:5
--> $DIR/integer_arithmetic.rs:94:5
|
LL | x + y
| ^^^^^
error: integer arithmetic detected
--> $DIR/integer_arithmetic.rs:100:5
--> $DIR/integer_arithmetic.rs:98:5
|
LL | (&x + &y)
| ^^^^^^^^^
error: aborting due to 17 previous errors
error: aborting due to 21 previous errors

37
tests/ui/large_const_arrays.fixed Normal file
View File

@ -0,0 +1,37 @@
// run-rustfix
#![warn(clippy::large_const_arrays)]
#![allow(dead_code)]
#[derive(Clone, Copy)]
pub struct S {
pub data: [u64; 32],
}
// Should lint
pub(crate) static FOO_PUB_CRATE: [u32; 1_000_000] = [0u32; 1_000_000];
pub static FOO_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
static FOO: [u32; 1_000_000] = [0u32; 1_000_000];
// Good
pub(crate) const G_FOO_PUB_CRATE: [u32; 1_000] = [0u32; 1_000];
pub const G_FOO_PUB: [u32; 1_000] = [0u32; 1_000];
const G_FOO: [u32; 1_000] = [0u32; 1_000];
fn main() {
// Should lint
pub static BAR_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
static BAR: [u32; 1_000_000] = [0u32; 1_000_000];
pub static BAR_STRUCT_PUB: [S; 5_000] = [S { data: [0; 32] }; 5_000];
static BAR_STRUCT: [S; 5_000] = [S { data: [0; 32] }; 5_000];
pub static BAR_S_PUB: [Option<&str>; 200_000] = [Some("str"); 200_000];
static BAR_S: [Option<&str>; 200_000] = [Some("str"); 200_000];
// Good
pub const G_BAR_PUB: [u32; 1_000] = [0u32; 1_000];
const G_BAR: [u32; 1_000] = [0u32; 1_000];
pub const G_BAR_STRUCT_PUB: [S; 500] = [S { data: [0; 32] }; 500];
const G_BAR_STRUCT: [S; 500] = [S { data: [0; 32] }; 500];
pub const G_BAR_S_PUB: [Option<&str>; 200] = [Some("str"); 200];
const G_BAR_S: [Option<&str>; 200] = [Some("str"); 200];
}

37
tests/ui/large_const_arrays.rs Normal file
View File

@ -0,0 +1,37 @@
// run-rustfix
#![warn(clippy::large_const_arrays)]
#![allow(dead_code)]
#[derive(Clone, Copy)]
pub struct S {
pub data: [u64; 32],
}
// Should lint
pub(crate) const FOO_PUB_CRATE: [u32; 1_000_000] = [0u32; 1_000_000];
pub const FOO_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
const FOO: [u32; 1_000_000] = [0u32; 1_000_000];
// Good
pub(crate) const G_FOO_PUB_CRATE: [u32; 1_000] = [0u32; 1_000];
pub const G_FOO_PUB: [u32; 1_000] = [0u32; 1_000];
const G_FOO: [u32; 1_000] = [0u32; 1_000];
fn main() {
// Should lint
pub const BAR_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
const BAR: [u32; 1_000_000] = [0u32; 1_000_000];
pub const BAR_STRUCT_PUB: [S; 5_000] = [S { data: [0; 32] }; 5_000];
const BAR_STRUCT: [S; 5_000] = [S { data: [0; 32] }; 5_000];
pub const BAR_S_PUB: [Option<&str>; 200_000] = [Some("str"); 200_000];
const BAR_S: [Option<&str>; 200_000] = [Some("str"); 200_000];
// Good
pub const G_BAR_PUB: [u32; 1_000] = [0u32; 1_000];
const G_BAR: [u32; 1_000] = [0u32; 1_000];
pub const G_BAR_STRUCT_PUB: [S; 500] = [S { data: [0; 32] }; 500];
const G_BAR_STRUCT: [S; 500] = [S { data: [0; 32] }; 500];
pub const G_BAR_S_PUB: [Option<&str>; 200] = [Some("str"); 200];
const G_BAR_S: [Option<&str>; 200] = [Some("str"); 200];
}

76
tests/ui/large_const_arrays.stderr Normal file
View File

@ -0,0 +1,76 @@
error: large array defined as const
--> $DIR/large_const_arrays.rs:12:1
|
LL | pub(crate) const FOO_PUB_CRATE: [u32; 1_000_000] = [0u32; 1_000_000];
| ^^^^^^^^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
|
= note: `-D clippy::large-const-arrays` implied by `-D warnings`
error: large array defined as const
--> $DIR/large_const_arrays.rs:13:1
|
LL | pub const FOO_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
| ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:14:1
|
LL | const FOO: [u32; 1_000_000] = [0u32; 1_000_000];
| -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:23:5
|
LL | pub const BAR_PUB: [u32; 1_000_000] = [0u32; 1_000_000];
| ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:24:5
|
LL | const BAR: [u32; 1_000_000] = [0u32; 1_000_000];
| -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:25:5
|
LL | pub const BAR_STRUCT_PUB: [S; 5_000] = [S { data: [0; 32] }; 5_000];
| ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:26:5
|
LL | const BAR_STRUCT: [S; 5_000] = [S { data: [0; 32] }; 5_000];
| -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:27:5
|
LL | pub const BAR_S_PUB: [Option<&str>; 200_000] = [Some("str"); 200_000];
| ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: large array defined as const
--> $DIR/large_const_arrays.rs:28:5
|
LL | const BAR_S: [Option<&str>; 200_000] = [Some("str"); 200_000];
| -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: make this a static item: `static`
error: aborting due to 9 previous errors

28
tests/ui/large_enum_variant.stderr
View File

@ -2,9 +2,14 @@ error: large size difference between variants
--> $DIR/large_enum_variant.rs:7:5
|
LL | B([i32; 8000]),
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ this variant is 32000 bytes
|
= note: `-D clippy::large-enum-variant` implied by `-D warnings`
note: and the second-largest variant is 4 bytes:
--> $DIR/large_enum_variant.rs:6:5
|
LL | A(i32),
| ^^^^^^
help: consider boxing the large fields to reduce the total size of the enum
|
LL | B(Box<[i32; 8000]>),
@ -14,8 +19,13 @@ error: large size difference between variants
--> $DIR/large_enum_variant.rs:31:5
|
LL | ContainingLargeEnum(LargeEnum),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this variant is 32004 bytes
|
note: and the second-largest variant is 8 bytes:
--> $DIR/large_enum_variant.rs:30:5
|
LL | VariantOk(i32, u32),
| ^^^^^^^^^^^^^^^^^^^
help: consider boxing the large fields to reduce the total size of the enum
|
LL | ContainingLargeEnum(Box<LargeEnum>),
@ -25,8 +35,13 @@ error: large size difference between variants
--> $DIR/large_enum_variant.rs:41:5
|
LL | StructLikeLarge { x: [i32; 8000], y: i32 },
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this variant is 32004 bytes
|
note: and the second-largest variant is 8 bytes:
--> $DIR/large_enum_variant.rs:40:5
|
LL | VariantOk(i32, u32),
| ^^^^^^^^^^^^^^^^^^^
help: consider boxing the large fields to reduce the total size of the enum
--> $DIR/large_enum_variant.rs:41:5
|
@ -37,8 +52,13 @@ error: large size difference between variants
--> $DIR/large_enum_variant.rs:46:5
|
LL | StructLikeLarge2 { x: [i32; 8000] },
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this variant is 32000 bytes
|
note: and the second-largest variant is 8 bytes:
--> $DIR/large_enum_variant.rs:45:5
|
LL | VariantOk(i32, u32),
| ^^^^^^^^^^^^^^^^^^^
help: consider boxing the large fields to reduce the total size of the enum
|
LL | StructLikeLarge2 { x: Box<[i32; 8000]> },

8
util/lintlib.py
View File

@ -14,7 +14,7 @@ lintname_re = re.compile(r'''pub\s+([A-Z_][A-Z_0-9]*)''')
group_re = re.compile(r'''\s*([a-z_][a-z_0-9]+)''')
conf_re = re.compile(r'''define_Conf! {\n([^}]*)\n}''', re.MULTILINE)
confvar_re = re.compile(
r'''/// Lint: (\w+)\. (.*)\n\s*\([^,]+,\s+"([^"]+)":\s+([^,]+),\s+([^\.\)]+).*\),''', re.MULTILINE)
r'''/// Lint: ([\w,\s]+)\. (.*)\n\s*\([^,]+,\s+"([^"]+)":\s+([^,]+),\s+([^\.\)]+).*\),''', re.MULTILINE)
comment_re = re.compile(r'''\s*/// ?(.*)''')
lint_levels = {
@ -93,9 +93,9 @@ def parse_configs(path):
match = re.search(conf_re, contents)
confvars = re.findall(confvar_re, match.group(1))
for (lint, doc, name, ty, default) in confvars:
configs[lint.lower()] = Config(name.replace("_", "-"), ty, doc, default)
for (lints, doc, name, ty, default) in confvars:
for lint in lints.split(','):
configs[lint.strip().lower()] = Config(name.replace("_", "-"), ty, doc, default)
return configs