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Suggest applicable expression for manual slice size calculation lint

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timvisee 2023-04-17 20:25:42 +02:00
parent e57deaace5
commit 503fd56a42
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GPG key ID: B8DB720BC383E172
2 changed files with 21 additions and 24 deletions
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22
clippy_lints/src/manual_slice_size_calculation.rs
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@ -1,5 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_context;
use clippy_utils::{expr_or_init, in_constant};
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
@ -42,15 +44,21 @@ impl<'tcx> LateLintPass<'tcx> for ManualSliceSizeCalculation {
if !in_constant(cx, expr.hir_id)
&& let ExprKind::Binary(ref op, left, right) = expr.kind
&& BinOpKind::Mul == op.node
&& let Some(_receiver) = simplify(cx, left, right)
&& let Some(receiver) = simplify(cx, left, right)
{
span_lint_and_help(
let ctxt = expr.span.ctxt();
let mut app = Applicability::MachineApplicable;
let val_name = snippet_with_context(cx, receiver.span, ctxt, "slice", &mut app).0;
span_lint_and_sugg(
cx,
MANUAL_SLICE_SIZE_CALCULATION,
expr.span,
"manual slice size calculation",
None,
"consider using std::mem::size_of_val instead");
expr.span,
"manual slice size calculation",
"try",
format!("std::mem::size_of_val({val_name})"),
Applicability::MachineApplicable,
);
}
}
}