Have raw_fd_ostream keep track of the position in the file to make tell() go faster by not requiring a flush().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60560 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
index 2b4b17d7b2..1a4f6bf6f4 100644
--- a/include/llvm/Support/raw_ostream.h
+++ b/include/llvm/Support/raw_ostream.h
@@ -151,6 +151,7 @@ private:
 class raw_fd_ostream : public raw_ostream {
   int FD;
   bool ShouldClose;
+  uint64_t pos;
 public:
   /// raw_fd_ostream - Open the specified file for writing. If an
   /// error occurs, information about the error is put into ErrorInfo,
@@ -178,7 +179,9 @@ public:
   void close();
   
   /// tell - Return the current offset with the file.
-  uint64_t tell();
+  uint64_t tell() {
+    return pos + (OutBufCur - OutBufStart);
+  }  
 };
   
 /// raw_stdout_ostream - This is a stream that always prints to stdout.