Fixed an offset calculation error.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56242 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/RewriteRope.cpp b/lib/Rewrite/RewriteRope.cpp
index 0a4dc85..61cb02b 100644
--- a/lib/Rewrite/RewriteRope.cpp
+++ b/lib/Rewrite/RewriteRope.cpp
@@ -792,7 +792,7 @@
if (AllocBuffer && --AllocBuffer->RefCount == 0)
delete [] (char*)AllocBuffer;
- unsigned AllocSize = sizeof(RopeRefCountString)-1+AllocChunkSize;
+ unsigned AllocSize = offsetof(RopeRefCountString, Data) + AllocChunkSize;
AllocBuffer = reinterpret_cast<RopeRefCountString *>(new char[AllocSize]);
AllocBuffer->RefCount = 0;
memcpy(AllocBuffer->Data, Start, Len);