================
@@ -186,4 +218,216 @@ bool Sema::CheckCountedByAttrOnField(FieldDecl *FD, Expr
*E, bool CountInBytes,
return false;
}
+SourceRange Sema::BoundsSafetySourceRangeFor(const CountAttributedType *CATy) {
+ // This is an approximation that's not quite right. This points to the
+ // the expression inside the attribute rather than the attribute itself.
+ //
+ // TODO: Implement logic to find the relevant TypeLoc for the attribute and
+ // get the SourceRange from that (#113582).
+ return CATy->getCountExpr()->getSourceRange();
+}
+
+static void EmitIncompleteCountedByPointeeNotes(Sema &S,
+ const CountAttributedType
*CATy,
+ NamedDecl *IncompleteTyDecl,
+ bool NoteAttrLocation = true) {
+ assert(IncompleteTyDecl == nullptr || isa<TypeDecl>(IncompleteTyDecl));
+
+ if (NoteAttrLocation) {
+ // Note where the attribute is declared
+ auto AttrSrcRange = S.BoundsSafetySourceRangeFor(CATy);
+ S.Diag(AttrSrcRange.getBegin(), diag::note_named_attribute)
+ << CATy->getAttributeName(/*WithMacroPrefix=*/true) << AttrSrcRange;
+ }
+
+ if (!IncompleteTyDecl)
+ return;
+
+ // If there's an associated forward declaration display it to emphasize
+ // why the type is incomplete (all we have is a forward declaration).
+
+ // Note the `IncompleteTyDecl` type is the underlying type which might not
+ // be the same as `CATy->getPointeeType()` which could be a typedef.
+ //
+ // The diagnostic printed will be at the location of the underlying type but
+ // the diagnostic text will print the type of `CATy->getPointeeType()` which
+ // could be a typedef name rather than the underlying type. This is ok
+ // though because the diagnostic will print the underlying type name too.
+ // E.g:
+ //
+ // `forward declaration of 'Incomplete_Struct_t'
+ // (aka 'struct IncompleteStructTy')`
+ //
+ // If this ends up being confusing we could emit a second diagnostic (one
+ // explaining where the typedef is) but that seems overly verbose.
----------------
delcypher wrote:
I removed this part of the comment.
https://github.com/llvm/llvm-project/pull/106321
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