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Pull in r321999 from upstream clang trunk (by Ivan A. Kosarev):

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[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

This fixes "Did not see access type in access path" fatal errors when
building the devel/gdb port (version 8.1).

Reported by:	jbeich
PR:		226658
MFC after:	3 months
X-MFC-With:	r327952
This commit is contained in:
dim 2018-03-16 18:04:13 +00:00
parent 18672e1082
commit c85e8aea72
1 changed files with 6 additions and 2 deletions
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8
contrib/llvm/tools/clang/lib/CodeGen/CGExpr.cpp
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@ -1034,8 +1034,12 @@ Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
// 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(),