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//===--Passes/RoundTripNativePass.cpp - Write Native file/Read it back-----===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lld/Core/Instrumentation.h"
#include "lld/Core/Simple.h"
#include "lld/Core/Writer.h"
#include "lld/Passes/RoundTripNativePass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Path.h"
#include <memory>
using namespace lld;
#define DEBUG_TYPE "RoundTripNativePass"
/// Perform the actual pass
void RoundTripNativePass::perform(std::unique_ptr<MutableFile> &mergedFile) {
ScopedTask task(getDefaultDomain(), "RoundTripNativePass");
std::unique_ptr<Writer> nativeWriter = createWriterNative(_context);
SmallString<128> tmpNativeFile;
// Separate the directory from the filename
StringRef outFile = llvm::sys::path::filename(_context.outputPath());
if (llvm::sys::fs::createTemporaryFile(outFile, "native", tmpNativeFile))
return;
DEBUG_WITH_TYPE("RoundTripNativePass", {
llvm::dbgs() << "RoundTripNativePass: " << tmpNativeFile << "\n";
});
// The file that is written would be kept around if there is a problem
// writing to the file or when reading atoms back from the file.
nativeWriter->writeFile(*mergedFile, tmpNativeFile.str());
ErrorOr<std::unique_ptr<MemoryBuffer>> mb =
MemoryBuffer::getFile(tmpNativeFile.str());
if (!mb)
return;
std::error_code ec = _context.registry().loadFile(
std::move(mb.get()), _nativeFile);
if (ec) {
// Note: we need a way for Passes to report errors.
llvm_unreachable("native reader not registered or read error");
}
File *objFile = _nativeFile[0].get();
if (objFile->parse())
llvm_unreachable("native reader parse error");
mergedFile.reset(new SimpleFileWrapper(_context, *objFile));
llvm::sys::fs::remove(tmpNativeFile.str());
}
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