+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::source::snippet;
+use if_chain::if_chain;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty::layout::LayoutOf;
use rustc_middle::ty::{self, ConstKind};
use rustc_session::{declare_tool_lint, impl_lint_pass};
-use if_chain::if_chain;
-
-use crate::rustc_target::abi::LayoutOf;
-use crate::utils::{snippet, span_lint_and_help};
-
declare_clippy_lint! {
- /// **What it does:** Checks for local arrays that may be too large.
- ///
- /// **Why is this bad?** Large local arrays may cause stack overflow.
+ /// ### What it does
+ /// Checks for local arrays that may be too large.
///
- /// **Known problems:** None.
+ /// ### Why is this bad?
+ /// Large local arrays may cause stack overflow.
///
- /// **Example:**
+ /// ### Example
/// ```rust,ignore
/// let a = [0u32; 1_000_000];
/// ```
if_chain! {
if let ExprKind::Repeat(_, _) = expr.kind;
if let ty::Array(element_type, cst) = cx.typeck_results().expr_ty(expr).kind();
- if let ConstKind::Value(val) = cst.val;
- if let ConstValue::Scalar(element_count) = val;
+ if let ConstKind::Value(ConstValue::Scalar(element_count)) = cst.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;