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Auto merge of #10806 - y21:issue10741, r=giraffate

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[`large_stack_arrays`]: check array initializer expressions

Fixes #10741.
Prior to this PR, the lint only checked array repeat expressions (ie. `[T; n]`). Now it also checks array initializer expressions.

changelog: [`large_stack_arrays`]: check array initializer expressions
This commit is contained in:
bors 2023-05-23 00:14:01 +00:00
commit ec2f2d5e47
3 changed files with 37 additions and 8 deletions
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2
clippy_lints/src/large_stack_arrays.rs
View file

@ -38,7 +38,7 @@ impl_lint_pass!(LargeStackArrays => [LARGE_STACK_ARRAYS]);
impl<'tcx> LateLintPass<'tcx> for LargeStackArrays {
fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
if let ExprKind::Repeat(_, _) = expr.kind
if let ExprKind::Repeat(_, _) | ExprKind::Array(_) = expr.kind
&& let ty::Array(element_type, cst) = cx.typeck_results().expr_ty(expr).kind()
&& let ConstKind::Value(ty::ValTree::Leaf(element_count)) = cst.kind()
&& let Ok(element_count) = element_count.try_to_target_usize(cx.tcx)

13
tests/ui/large_stack_arrays.rs
View file

@ -18,6 +18,19 @@ pub static DOESNOTLINT2: [u8; 512_001] = {
[x; 512_001]
};
fn issue_10741() {
#[derive(Copy, Clone)]
struct Large([u32; 100_000]);
fn build() -> Large {
Large([0; 100_000])
}
let _x = [build(); 3];
let _y = [build(), build(), build()];
}
fn main() {
let bad = (
[0u32; 20_000_000],

30
tests/ui/large_stack_arrays.stderr
View file

@ -1,14 +1,30 @@
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:23:9
--> $DIR/large_stack_arrays.rs:29:14
|
LL | let _x = [build(); 3];
| ^^^^^^^^^^^^
|
= help: consider allocating on the heap with `vec![build(); 3].into_boxed_slice()`
= note: `-D clippy::large-stack-arrays` implied by `-D warnings`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:31:14
|
LL | let _y = [build(), build(), build()];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider allocating on the heap with `vec![build(), build(), build()].into_boxed_slice()`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:36:9
|
LL | [0u32; 20_000_000],
| ^^^^^^^^^^^^^^^^^^
|
= help: consider allocating on the heap with `vec![0u32; 20_000_000].into_boxed_slice()`
= note: `-D clippy::large-stack-arrays` implied by `-D warnings`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:24:9
--> $DIR/large_stack_arrays.rs:37:9
|
LL | [S { data: [0; 32] }; 5000],
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -16,7 +32,7 @@ LL | [S { data: [0; 32] }; 5000],
= help: consider allocating on the heap with `vec![S { data: [0; 32] }; 5000].into_boxed_slice()`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:25:9
--> $DIR/large_stack_arrays.rs:38:9
|
LL | [Some(""); 20_000_000],
| ^^^^^^^^^^^^^^^^^^^^^^
@ -24,7 +40,7 @@ LL | [Some(""); 20_000_000],
= help: consider allocating on the heap with `vec![Some(""); 20_000_000].into_boxed_slice()`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:26:9
--> $DIR/large_stack_arrays.rs:39:9
|
LL | [E::T(0); 5000],
| ^^^^^^^^^^^^^^^
@ -32,12 +48,12 @@ LL | [E::T(0); 5000],
= help: consider allocating on the heap with `vec![E::T(0); 5000].into_boxed_slice()`
error: allocating a local array larger than 512000 bytes
--> $DIR/large_stack_arrays.rs:27:9
--> $DIR/large_stack_arrays.rs:40:9
|
LL | [0u8; usize::MAX],
| ^^^^^^^^^^^^^^^^^
|
= help: consider allocating on the heap with `vec![0u8; usize::MAX].into_boxed_slice()`
error: aborting due to 5 previous errors
error: aborting due to 7 previous errors