[ms-cxxabi] bitcast to i8* to deref a data member pointer
This was causing us to miscompile
llvm::SymbolTableListTraits::getListOwner(), which uses data member
pointers.
llvm-svn: 196545
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index 6a45dba..044e572 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -1691,6 +1691,11 @@
Base = AdjustVirtualBase(CGF, RD, Base, VirtualBaseAdjustmentOffset,
VBPtrOffset);
}
+
+ // Cast to char*.
+ Base = Builder.CreateBitCast(Base, Builder.getInt8Ty()->getPointerTo(AS));
+
+ // Apply the offset, which we assume is non-null.
llvm::Value *Addr =
Builder.CreateInBoundsGEP(Base, FieldOffset, "memptr.offset");