vendor/lld/lld-trunk-r366426

1 files changed, 0 insertions, 86 deletions

diff --git a/ELF/Filesystem.cpp b/ELF/Filesystem.cpp
deleted file mode 100644
index 5cf240eeca56..000000000000
--- a/ELF/Filesystem.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-//===- Filesystem.cpp -----------------------------------------------------===//
-//
-//                             The LLVM Linker
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains a few utility functions to handle files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Filesystem.h"
-#include "Config.h"
-#include "lld/Common/Threads.h"
-#include "llvm/Config/llvm-config.h"
-#include "llvm/Support/FileOutputBuffer.h"
-#include "llvm/Support/FileSystem.h"
-#if LLVM_ON_UNIX
-#include <unistd.h>
-#endif
-#include <thread>
-
-using namespace llvm;
-
-using namespace lld;
-using namespace lld::elf;
-
-// Removes a given file asynchronously. This is a performance hack,
-// so remove this when operating systems are improved.
-//
-// On Linux (and probably on other Unix-like systems), unlink(2) is a
-// noticeably slow system call. As of 2016, unlink takes 250
-// milliseconds to remove a 1 GB file on ext4 filesystem on my machine.
-//
-// To create a new result file, we first remove existing file. So, if
-// you repeatedly link a 1 GB program in a regular compile-link-debug
-// cycle, every cycle wastes 250 milliseconds only to remove a file.
-// Since LLD can link a 1 GB binary in about 5 seconds, that waste
-// actually counts.
-//
-// This function spawns a background thread to remove the file.
-// The calling thread returns almost immediately.
-void elf::unlinkAsync(StringRef Path) {
-// Removing a file is async on windows.
-#if defined(_WIN32)
-  sys::fs::remove(Path);
-#else
-  if (!ThreadsEnabled || !sys::fs::exists(Path) ||
-      !sys::fs::is_regular_file(Path))
-    return;
-
-  // We cannot just remove path from a different thread because we are now going
-  // to create path as a new file.
-  // Instead we open the file and unlink it on this thread. The unlink is fast
-  // since the open fd guarantees that it is not removing the last reference.
-  int FD;
-  std::error_code EC = sys::fs::openFileForRead(Path, FD);
-  sys::fs::remove(Path);
-
-  // close and therefore remove TempPath in background.
-  if (!EC)
-    std::thread([=] { ::close(FD); }).detach();
-#endif
-}
-
-// Simulate file creation to see if Path is writable.
-//
-// Determining whether a file is writable or not is amazingly hard,
-// and after all the only reliable way of doing that is to actually
-// create a file. But we don't want to do that in this function
-// because LLD shouldn't update any file if it will end in a failure.
-// We also don't want to reimplement heuristics to determine if a
-// file is writable. So we'll let FileOutputBuffer do the work.
-//
-// FileOutputBuffer doesn't touch a desitnation file until commit()
-// is called. We use that class without calling commit() to predict
-// if the given file is writable.
-std::error_code elf::tryCreateFile(StringRef Path) {
-  if (Path.empty())
-    return std::error_code();
-  if (Path == "-")
-    return std::error_code();
-  return errorToErrorCode(FileOutputBuffer::create(Path, 1).takeError());
-}