diff options
Diffstat (limited to 'contrib/llvm/lib/Support/FileOutputBuffer.cpp')
| -rw-r--r-- | contrib/llvm/lib/Support/FileOutputBuffer.cpp | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/contrib/llvm/lib/Support/FileOutputBuffer.cpp b/contrib/llvm/lib/Support/FileOutputBuffer.cpp index b176a8b45ab3..6f064c983611 100644 --- a/contrib/llvm/lib/Support/FileOutputBuffer.cpp +++ b/contrib/llvm/lib/Support/FileOutputBuffer.cpp @@ -11,11 +11,10 @@ // //===----------------------------------------------------------------------===// -#include "llvm/Support/Errc.h" -#include "llvm/ADT/STLExtras.h" -#include "llvm/ADT/SmallVector.h" #include "llvm/Support/FileOutputBuffer.h" -#include "llvm/Support/raw_ostream.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/Support/Errc.h" #include <system_error> #if !defined(_MSC_VER) && !defined(__MINGW32__) @@ -77,9 +76,16 @@ FileOutputBuffer::create(StringRef FilePath, size_t Size, if (EC) return EC; +#ifndef LLVM_ON_WIN32 + // On Windows, CreateFileMapping (the mmap function on Windows) + // automatically extends the underlying file. We don't need to + // extend the file beforehand. _chsize (ftruncate on Windows) is + // pretty slow just like it writes specified amount of bytes, + // so we should avoid calling that. EC = sys::fs::resize_file(FD, Size); if (EC) return EC; +#endif auto MappedFile = llvm::make_unique<mapped_file_region>( FD, mapped_file_region::readwrite, Size, 0, EC); @@ -103,4 +109,4 @@ std::error_code FileOutputBuffer::commit() { // Rename file to final name. return sys::fs::rename(Twine(TempPath), Twine(FinalPath)); } -} // namespace +} // namespace llvm |