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//===- FileOutputBuffer.cpp ------------------------------------------------===//
//
// The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <mcld/Support/FileOutputBuffer.h>
#include <mcld/Support/FileHandle.h>
#include <mcld/Support/Path.h>
using namespace mcld;
using llvm::sys::fs::mapped_file_region;
FileOutputBuffer::FileOutputBuffer(llvm::sys::fs::mapped_file_region* pRegion,
FileHandle& pFileHandle)
: m_pRegion(pRegion), m_FileHandle(pFileHandle)
{
}
FileOutputBuffer::~FileOutputBuffer()
{
// Unmap buffer, letting OS flush dirty pages to file on disk.
m_pRegion.reset(0);
}
llvm::error_code FileOutputBuffer::create(FileHandle& pFileHandle,
size_t pSize, llvm::OwningPtr<FileOutputBuffer>& pResult)
{
llvm::error_code EC;
llvm::OwningPtr<mapped_file_region> mapped_file(new mapped_file_region(
pFileHandle.handler(),
false,
mapped_file_region::readwrite,
pSize,
0,
EC));
if (EC)
return EC;
pResult.reset(new FileOutputBuffer(mapped_file.get(), pFileHandle));
if (pResult)
mapped_file.take();
return llvm::error_code::success();
}
MemoryRegion FileOutputBuffer::request(size_t pOffset, size_t pLength)
{
if (pOffset > getBufferSize() || (pOffset + pLength) > getBufferSize())
return MemoryRegion();
return MemoryRegion(getBufferStart() + pOffset, pLength);
}
llvm::StringRef FileOutputBuffer::getPath() const
{
return m_FileHandle.path().native();
}
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