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update config and suggest

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naosense 2022-11-23 16:26:25 +08:00
parent aed9497978
commit 4528aec7e9
8 changed files with 63 additions and 75 deletions
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45
clippy_lints/src/indexing_slicing.rs
View file

@ -1,9 +1,10 @@
//! lint on indexing and slicing operations
use clippy_utils::consts::{constant, Constant};
use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
use clippy_utils::higher;
use rustc_ast::ast::RangeLimits;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
@ -86,18 +87,20 @@ impl_lint_pass!(IndexingSlicing => [INDEXING_SLICING, OUT_OF_BOUNDS_INDEXING]);
#[derive(Copy, Clone)]
pub struct IndexingSlicing {
suppress_lint_in_const: bool,
suppress_restriction_lint_in_const: bool,
}
impl IndexingSlicing {
pub fn new(suppress_lint_in_const: bool) -> Self {
Self { suppress_lint_in_const }
pub fn new(suppress_restriction_lint_in_const: bool) -> Self {
Self {
suppress_restriction_lint_in_const,
}
}
}
impl<'tcx> LateLintPass<'tcx> for IndexingSlicing {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
if self.suppress_lint_in_const && cx.tcx.hir().is_inside_const_context(expr.hir_id) {
if self.suppress_restriction_lint_in_const && cx.tcx.hir().is_inside_const_context(expr.hir_id) {
return;
}
@ -152,12 +155,19 @@ impl<'tcx> LateLintPass<'tcx> for IndexingSlicing {
(None, None) => return, // [..] is ok.
};
span_lint_and_help(cx, INDEXING_SLICING, expr.span, "slicing may panic", None, help_msg);
span_lint_and_then(cx, INDEXING_SLICING, expr.span, "slicing may panic", |diag| {
let note = if cx.tcx.hir().is_inside_const_context(expr.hir_id) {
"the suggestion might not be applicable in constant blocks"
} else {
""
};
diag.span_suggestion(expr.span, help_msg, note, Applicability::MachineApplicable);
});
} else {
// Catchall non-range index, i.e., [n] or [n << m]
if let ty::Array(..) = ty.kind() {
// Index is a const block.
if self.suppress_lint_in_const && let ExprKind::ConstBlock(..) = index.kind {
if self.suppress_restriction_lint_in_const && let ExprKind::ConstBlock(..) = index.kind {
return;
}
// Index is a constant uint.
@ -167,14 +177,19 @@ impl<'tcx> LateLintPass<'tcx> for IndexingSlicing {
}
}
span_lint_and_help(
cx,
INDEXING_SLICING,
expr.span,
"indexing may panic",
None,
"consider using `.get(n)` or `.get_mut(n)` instead",
);
span_lint_and_then(cx, INDEXING_SLICING, expr.span, "indexing may panic", |diag| {
let note = if cx.tcx.hir().is_inside_const_context(expr.hir_id) {
"the suggestion might not be applicable in constant blocks"
} else {
""
};
diag.span_suggestion(
expr.span,
"consider using `.get(n)` or `.get_mut(n)` instead",
note,
Applicability::MachineApplicable,
);
});
}
}
}

8
clippy_lints/src/lib.rs
View file

@ -562,7 +562,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
let allow_expect_in_tests = conf.allow_expect_in_tests;
let allow_unwrap_in_tests = conf.allow_unwrap_in_tests;
let suppress_lint_in_const = conf.suppress_lint_in_const;
let suppress_restriction_lint_in_const = conf.suppress_restriction_lint_in_const;
store.register_late_pass(move |_| Box::new(approx_const::ApproxConstant::new(msrv())));
store.register_late_pass(move |_| Box::new(approx_const::ApproxConstant::new(msrv)));
store.register_late_pass(move |_| {
@ -685,7 +685,11 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(|_| Box::new(inherent_impl::MultipleInherentImpl));
store.register_late_pass(|_| Box::new(neg_cmp_op_on_partial_ord::NoNegCompOpForPartialOrd));
store.register_late_pass(|_| Box::new(unwrap::Unwrap));
store.register_late_pass(move |_| Box::new(indexing_slicing::IndexingSlicing::new(suppress_lint_in_const)));
store.register_late_pass(move |_| {
Box::new(indexing_slicing::IndexingSlicing::new(
suppress_restriction_lint_in_const,
))
});
store.register_late_pass(|_| Box::new(non_copy_const::NonCopyConst));
store.register_late_pass(|_| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
store.register_late_pass(|_| Box::new(redundant_clone::RedundantClone));

8
clippy_lints/src/utils/conf.rs
View file

@ -408,8 +408,12 @@ define_Conf! {
(allow_mixed_uninlined_format_args: bool = true),
/// Lint: INDEXING_SLICING
///
/// Whether to suppress lint in const function
(suppress_lint_in_const: bool = true),
/// Whether to suppress a restriction lint in constant code. In same
/// cases the restructured operation might not be unavoidable, as the
/// suggested counterparts are unavailable in constant code. This
/// configuration will cause restriction lints to trigger even
/// if no suggestion can be made.
(suppress_restriction_lint_in_const: bool = true),
}
/// Search for the configuration file.

2
tests/ui-toml/suppress_lint_in_const/clippy.toml
View file

@ -1 +1 @@
suppress-lint-in-const = false
suppress-restriction-lint-in-const = false

3
tests/ui-toml/suppress_lint_in_const/test.stderr
View file

@ -2,9 +2,8 @@ error: indexing may panic
--> $DIR/test.rs:11:9
|
LL | self.value[0] & 0b1000_0000 != 0
| ^^^^^^^^^^^^^
| ^^^^^^^^^^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead: `the suggestion might not be applicable in constant blocks`
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
= note: `-D clippy::indexing-slicing` implied by `-D warnings`
error: aborting due to previous error

2
tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr
View file

@ -35,7 +35,7 @@ error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown fie
pass-by-value-size-limit
single-char-binding-names-threshold
standard-macro-braces
suppress-lint-in-const
suppress-restriction-lint-in-const
third-party
too-large-for-stack
too-many-arguments-threshold

23
tests/ui/indexing_slicing_index.stderr
View file

@ -14,50 +14,39 @@ error: indexing may panic
--> $DIR/indexing_slicing_index.rs:22:5
|
LL | x[index];
| ^^^^^^^^
| ^^^^^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
= note: `-D clippy::indexing-slicing` implied by `-D warnings`
error: indexing may panic
--> $DIR/indexing_slicing_index.rs:38:5
|
LL | v[0];
| ^^^^
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
| ^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
error: indexing may panic
--> $DIR/indexing_slicing_index.rs:39:5
|
LL | v[10];
| ^^^^^
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
| ^^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
error: indexing may panic
--> $DIR/indexing_slicing_index.rs:40:5
|
LL | v[1 << 3];
| ^^^^^^^^^
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
| ^^^^^^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
error: indexing may panic
--> $DIR/indexing_slicing_index.rs:46:5
|
LL | v[N];
| ^^^^
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
| ^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
error: indexing may panic
--> $DIR/indexing_slicing_index.rs:47:5
|
LL | v[M];
| ^^^^
|
= help: consider using `.get(n)` or `.get_mut(n)` instead
| ^^^^ help: consider using `.get(n)` or `.get_mut(n)` instead
error[E0080]: evaluation of constant value failed
--> $DIR/indexing_slicing_index.rs:10:24

47
tests/ui/indexing_slicing_slice.stderr
View file

@ -2,50 +2,39 @@ error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:12:6
|
LL | &x[index..];
| ^^^^^^^^^^
| ^^^^^^^^^^ help: consider using `.get(n..)` or .get_mut(n..)` instead
|
= help: consider using `.get(n..)` or .get_mut(n..)` instead
= note: `-D clippy::indexing-slicing` implied by `-D warnings`
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:13:6
|
LL | &x[..index];
| ^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:14:6
|
LL | &x[index_from..index_to];
| ^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider using `.get(n..m)` or `.get_mut(n..m)` instead
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.get(n..m)` or `.get_mut(n..m)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:15:6
|
LL | &x[index_from..][..index_to]; // Two lint reports, one for [index_from..] and another for [..index_to].
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:15:6
|
LL | &x[index_from..][..index_to]; // Two lint reports, one for [index_from..] and another for [..index_to].
| ^^^^^^^^^^^^^^^
|
= help: consider using `.get(n..)` or .get_mut(n..)` instead
| ^^^^^^^^^^^^^^^ help: consider using `.get(n..)` or .get_mut(n..)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:16:6
|
LL | &x[5..][..10]; // Two lint reports, one for out of bounds [5..] and another for slicing [..10].
| ^^^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: range is out of bounds
--> $DIR/indexing_slicing_slice.rs:16:8
@ -59,17 +48,13 @@ error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:17:6
|
LL | &x[0..][..3];
| ^^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:18:6
|
LL | &x[1..][..5];
| ^^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: range is out of bounds
--> $DIR/indexing_slicing_slice.rs:25:12
@ -87,17 +72,13 @@ error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:31:6
|
LL | &v[10..100];
| ^^^^^^^^^^
|
= help: consider using `.get(n..m)` or `.get_mut(n..m)` instead
| ^^^^^^^^^^ help: consider using `.get(n..m)` or `.get_mut(n..m)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:32:6
|
LL | &x[10..][..100]; // Two lint reports, one for [10..] and another for [..100].
| ^^^^^^^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: range is out of bounds
--> $DIR/indexing_slicing_slice.rs:32:8
@ -109,17 +90,13 @@ error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:33:6
|
LL | &v[10..];
| ^^^^^^^
|
= help: consider using `.get(n..)` or .get_mut(n..)` instead
| ^^^^^^^ help: consider using `.get(n..)` or .get_mut(n..)` instead
error: slicing may panic
--> $DIR/indexing_slicing_slice.rs:34:6
|
LL | &v[..100];
| ^^^^^^^^
|
= help: consider using `.get(..n)`or `.get_mut(..n)` instead
| ^^^^^^^^ help: consider using `.get(..n)`or `.get_mut(..n)` instead
error: aborting due to 16 previous errors