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[Support] Make FileOutputBuffer work on Windows.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2012-12-03 22:09:52 +00:00
parent 604db310f0
commit 6bc86018d1
3 changed files with 60 additions and 105 deletions
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82
lib/Support/FileOutputBuffer.cpp
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@ -14,34 +14,26 @@
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
using llvm::sys::fs::mapped_file_region;
namespace llvm {
FileOutputBuffer::FileOutputBuffer(uint8_t *Start, uint8_t *End,
StringRef Path, StringRef TmpPath)
: BufferStart(Start), BufferEnd(End) {
FinalPath.assign(Path);
TempPath.assign(TmpPath);
FileOutputBuffer::FileOutputBuffer(mapped_file_region * R,
StringRef Path, StringRef TmpPath)
: Region(R)
, FinalPath(Path)
, TempPath(TmpPath) {
}
FileOutputBuffer::~FileOutputBuffer() {
// If not already commited, delete buffer and remove temp file.
if ( BufferStart != NULL ) {
sys::fs::unmap_file_pages((void*)BufferStart, getBufferSize());
bool Existed;
sys::fs::remove(Twine(TempPath), Existed);
}
bool Existed;
sys::fs::remove(Twine(TempPath), Existed);
}
error_code FileOutputBuffer::create(StringRef FilePath,
size_t Size,
error_code FileOutputBuffer::create(StringRef FilePath,
size_t Size,
OwningPtr<FileOutputBuffer> &Result,
unsigned Flags) {
// If file already exists, it must be a regular file (to be mappable).
@ -69,34 +61,27 @@ error_code FileOutputBuffer::create(StringRef FilePath,
EC = sys::fs::remove(FilePath, Existed);
if (EC)
return EC;
// Create new file in same directory but with random name.
SmallString<128> TempFilePath;
int FD;
EC = sys::fs::unique_file(Twine(FilePath) + ".tmp%%%%%%%",
FD, TempFilePath, false, 0644);
EC = sys::fs::unique_file(Twine(FilePath) + ".tmp%%%%%%%",
FD, TempFilePath, false, 0644);
if (EC)
return EC;
// The unique_file() interface leaks lower layers and returns a file
// descriptor. There is no way to directly close it, so use this hack
// to hand it off to raw_fd_ostream to close for us.
{
raw_fd_ostream Dummy(FD, /*shouldClose=*/true);
}
// Resize file to requested initial size
EC = sys::fs::resize_file(Twine(TempFilePath), Size);
OwningPtr<mapped_file_region> MappedFile(
new mapped_file_region(FD, mapped_file_region::readwrite, Size, 0, EC));
if (EC)
return EC;
// If requested, make the output file executable.
if ( Flags & F_executable ) {
sys::fs::file_status Stat2;
EC = sys::fs::status(Twine(TempFilePath), Stat2);
if (EC)
return EC;
sys::fs::perms new_perms = Stat2.permissions();
if ( new_perms & sys::fs::owner_read )
new_perms |= sys::fs::owner_exe;
@ -110,38 +95,25 @@ error_code FileOutputBuffer::create(StringRef FilePath,
return EC;
}
// Memory map new file.
void *Base;
EC = sys::fs::map_file_pages(Twine(TempFilePath), 0, Size, true, Base);
if (EC)
return EC;
// Create FileOutputBuffer object to own mapped range.
uint8_t *Start = reinterpret_cast<uint8_t*>(Base);
Result.reset(new FileOutputBuffer(Start, Start+Size, FilePath, TempFilePath));
return error_code::success();
}
Result.reset(new FileOutputBuffer(MappedFile.get(), FilePath, TempFilePath));
if (Result)
MappedFile.take();
return error_code::success();
}
error_code FileOutputBuffer::commit(int64_t NewSmallerSize) {
// Unmap buffer, letting OS flush dirty pages to file on disk.
void *Start = reinterpret_cast<void*>(BufferStart);
error_code EC = sys::fs::unmap_file_pages(Start, getBufferSize());
if (EC)
return EC;
Region.reset(0);
// If requested, resize file as part of commit.
if ( NewSmallerSize != -1 ) {
EC = sys::fs::resize_file(Twine(TempPath), NewSmallerSize);
error_code EC = sys::fs::resize_file(Twine(TempPath), NewSmallerSize);
if (EC)
return EC;
}
// Rename file to final name.
return sys::fs::rename(Twine(TempPath), Twine(FinalPath));
}
} // namespace