32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
use super::CROSSPOINTER_TRANSMUTE;
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use clippy_utils::diagnostics::span_lint;
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use rustc_hir::Expr;
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use rustc_lint::LateContext;
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use rustc_middle::ty::{self, Ty};
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/// Checks for `crosspointer_transmute` lint.
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/// Returns `true` if it's triggered, otherwise returns `false`.
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pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, from_ty: Ty<'tcx>, to_ty: Ty<'tcx>) -> bool {
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match (*from_ty.kind(), *to_ty.kind()) {
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(ty::RawPtr(from_ptr_ty, _), _) if from_ptr_ty == to_ty => {
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span_lint(
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cx,
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CROSSPOINTER_TRANSMUTE,
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e.span,
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format!("transmute from a type (`{from_ty}`) to the type that it points to (`{to_ty}`)"),
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);
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true
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},
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(_, ty::RawPtr(to_ptr_ty, _)) if to_ptr_ty == from_ty => {
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span_lint(
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cx,
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CROSSPOINTER_TRANSMUTE,
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e.span,
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format!("transmute from a type (`{from_ty}`) to a pointer to that type (`{to_ty}`)"),
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);
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true
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},
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_ => false,
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}
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}
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