[PATCH] UBSan: Teach isDerivedFromAtOffset and findBaseAtOffset about vbases

[Alexey Samsonov]

LGTM. Thanks for doing this!

================
Comment at: lib/ubsan/ubsan_type_hash.cc:143
@@ +142,3 @@
+          abi::__base_class_type_info::__virtual_mask) {
+      const char *VTable = *reinterpret_cast<const char *const *>(Object);
+      OffsetHere = *reinterpret_cast<const sptr *>(VTable + OffsetHere);
----------------
Can this be
  sptr VTable = *reinterpret_cast<sptr *>(Object);
  OffsetHere = *reinterpret_cast<sptr *>(VTable + OffsetHere);
?

http://reviews.llvm.org/D6074