From 3d4218570ad4c87ea86cf709da78d6e450476d01 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Tue, 20 Apr 2010 05:07:22 +0000
Subject: [PATCH] Assert that the path from the derived to the base class in
 CodeGenFunction::GetAddressOfBaseClass is not ambiguous.

llvm-svn: 101869
---
 clang/lib/CodeGen/CGClass.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/clang/lib/CodeGen/CGClass.cpp b/clang/lib/CodeGen/CGClass.cpp
index 42b0591f3844..5e7cc4b51484 100644
--- a/clang/lib/CodeGen/CGClass.cpp
+++ b/clang/lib/CodeGen/CGClass.cpp
@@ -120,14 +120,21 @@ CodeGenFunction::GetAddressOfBaseClass(llvm::Value *Value,
     return Builder.CreateBitCast(Value, BasePtrTy);
   }
 
+#ifndef NDEBUG
+  CXXBasePaths Paths(/*FindAmbiguities=*/true,
+                     /*RecordPaths=*/true, /*DetectVirtual=*/false);
+#else
   CXXBasePaths Paths(/*FindAmbiguities=*/false,
                      /*RecordPaths=*/true, /*DetectVirtual=*/false);
+#endif
   if (!const_cast<CXXRecordDecl *>(Class)->
         isDerivedFrom(const_cast<CXXRecordDecl *>(BaseClass), Paths)) {
     assert(false && "Class must be derived from the passed in base class!");
     return 0;
   }
 
+  assert(!Paths.isAmbiguous(BTy) && "Path is ambiguous");
+
   unsigned Start = 0;
   llvm::Value *VirtualOffset = 0;