vendor/llvm/llvm-trunk-r302069

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/Support/BinaryStreamWriter.cpp b/lib/Support/BinaryStreamWriter.cpp
index d60b75642d0f..d78dbc68f593 100644
--- a/lib/Support/BinaryStreamWriter.cpp
+++ b/lib/Support/BinaryStreamWriter.cpp
@@ -59,6 +59,19 @@ Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint32_t Length) {
   return Error::success();
 }
 
+std::pair<BinaryStreamWriter, BinaryStreamWriter>
+BinaryStreamWriter::split(uint32_t Off) const {
+  assert(getLength() >= Off);
+
+  WritableBinaryStreamRef First = Stream.drop_front(Offset);
+
+  WritableBinaryStreamRef Second = First.drop_front(Off);
+  First = First.keep_front(Off);
+  BinaryStreamWriter W1{First};
+  BinaryStreamWriter W2{Second};
+  return std::make_pair(W1, W2);
+}
+
 Error BinaryStreamWriter::padToAlignment(uint32_t Align) {
   uint32_t NewOffset = alignTo(Offset, Align);
   if (NewOffset > getLength())