[CodeGen] Fix TBAA info for accesses to members of base classes
Resolves:
Bug 35724 - regression (r315984): fatal error: error in backend:
Broken function found (Did not see access type in access path!)
https://bugs.llvm.org/show_bug.cgi?id=35724
Differential Revision: https://reviews.llvm.org/D41547
llvm-svn: 321999
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 3a46bbf..73354cd 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1034,8 +1034,12 @@
// Derived-to-base conversions.
case CK_UncheckedDerivedToBase:
case CK_DerivedToBase: {
- Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo,
- TBAAInfo);
+ // TODO: Support accesses to members of base classes in TBAA. For now, we
+ // conservatively pretend that the complete object is of the base class
+ // type.
+ if (TBAAInfo)
+ *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
+ Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
return GetAddressOfBaseClass(Addr, Derived,
CE->path_begin(), CE->path_end(),