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UBSan: Teach isDerivedFromAtOffset and findBaseAtOffset about vbases
authorDavid Majnemer <david.majnemer@gmail.com>
Thu, 6 Nov 2014 08:55:23 +0000 (08:55 +0000)
committerDavid Majnemer <david.majnemer@gmail.com>
Thu, 6 Nov 2014 08:55:23 +0000 (08:55 +0000)
commit3400563ea6160dce01a0fb4741bacc4b61db74ad
tree65de8aacf79208120323f06efd775625d6015306tree | snapshot
parent51ff559500c460f7f779019c1bfa964a1c2f223dcommit | diff
UBSan: Teach isDerivedFromAtOffset and findBaseAtOffset about vbases

When the __virtual_mask is set, __offset_flags >> __offset_shift yields
an offset into the vtable.  Dereferencing this vtable slot gets us the
vbase offset.

Adjust a test case to verify that this, in fact, works.

Differential Revision: http://reviews.llvm.org/D6074

llvm-svn: 221445
compiler-rt/lib/ubsan/ubsan_type_hash.cc diff | blob | history
compiler-rt/test/ubsan/TestCases/TypeCheck/vptr.cpp diff | blob | history
Domain: System / Toolchain;