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coverage: Check that the function signature span precedes the body

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This will normally be true, but in cases where it's not true we're better off
not making any assumptions about the signature.
This commit is contained in:
Zalathar 2023-12-14 13:47:26 +11:00
parent 3b610c764d
commit 684b9ea408
1 changed files with 4 additions and 2 deletions
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6
compiler/rustc_mir_transform/src/coverage/mod.rs
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@ -324,14 +324,16 @@ fn extract_hir_info<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> ExtractedHir
let body_span = get_body_span(tcx, hir_body, def_id);
// The actual signature span is only used if it has the same context and
// filename as the body.
// filename as the body, and precedes the body.
let maybe_fn_sig_span = hir_node.fn_sig().map(|fn_sig| fn_sig.span);
let fn_sig_span = maybe_fn_sig_span
.filter(|&fn_sig_span| {
let source_map = tcx.sess.source_map();
let file_idx = |span: Span| source_map.lookup_source_file_idx(span.lo());
fn_sig_span.eq_ctxt(body_span) && file_idx(fn_sig_span) == file_idx(body_span)
fn_sig_span.eq_ctxt(body_span)
&& fn_sig_span.hi() <= body_span.lo()
&& file_idx(fn_sig_span) == file_idx(body_span)
})
// If so, extend it to the start of the body span.
.map(|fn_sig_span| fn_sig_span.with_hi(body_span.lo()))