50 lines
1.6 KiB
Rust
50 lines
1.6 KiB
Rust
use super::utils::is_layout_incompatible;
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use super::UNSOUND_COLLECTION_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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use rustc_span::symbol::sym;
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/// Checks for `unsound_collection_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::Adt(from_adt, from_args), ty::Adt(to_adt, to_args)) => {
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if from_adt.did() != to_adt.did() {
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return false;
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}
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if !matches!(
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cx.tcx.get_diagnostic_name(to_adt.did()),
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Some(
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sym::BTreeMap
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| sym::BTreeSet
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| sym::BinaryHeap
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| sym::HashMap
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| sym::HashSet
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| sym::Vec
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| sym::VecDeque
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)
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) {
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return false;
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}
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if from_args
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.types()
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.zip(to_args.types())
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.any(|(from_ty, to_ty)| is_layout_incompatible(cx, from_ty, to_ty))
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{
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span_lint(
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cx,
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UNSOUND_COLLECTION_TRANSMUTE,
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e.span,
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&format!("transmute from `{from_ty}` to `{to_ty}` with mismatched layout is unsound"),
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);
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true
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} else {
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false
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}
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},
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_ => false,
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}
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}
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