59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
//===--Passes/RoundTripYAMLPass.cpp - Write YAML file/Read it back---------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "RoundTripYAMLPass"
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#include "lld/Core/Instrumentation.h"
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#include "lld/Passes/RoundTripYAMLPass.h"
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#include "lld/ReaderWriter/Simple.h"
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#include "lld/ReaderWriter/Writer.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Path.h"
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// Skip YAML files larger than this to avoid OOM error. The YAML reader consumes
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// excessively large amount of memory when parsing a large file.
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// TODO: Fix the YAML reader to reduce memory footprint.
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static const size_t MAX_YAML_FILE_SIZE = 50 * 1024 * 1024;
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using namespace lld;
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/// Perform the actual pass
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void RoundTripYAMLPass::perform(std::unique_ptr<MutableFile> &mergedFile) {
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ScopedTask task(getDefaultDomain(), "RoundTripYAMLPass");
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std::unique_ptr<Writer> yamlWriter = createWriterYAML(_context);
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SmallString<128> tmpYAMLFile;
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// Separate the directory from the filename
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StringRef outFile = llvm::sys::path::filename(_context.outputPath());
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if (llvm::sys::fs::createTemporaryFile(outFile, "yaml", tmpYAMLFile))
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return;
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DEBUG_WITH_TYPE("RoundTripYAMLPass", {
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llvm::dbgs() << "RoundTripYAMLPass: " << tmpYAMLFile << "\n";
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});
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// The file that is written would be kept around if there is a problem
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// writing to the file or when reading atoms back from the file.
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yamlWriter->writeFile(*mergedFile, tmpYAMLFile.str());
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OwningPtr<MemoryBuffer> buff;
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if (MemoryBuffer::getFile(tmpYAMLFile.str(), buff))
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return;
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if (buff->getBufferSize() < MAX_YAML_FILE_SIZE) {
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std::unique_ptr<MemoryBuffer> mb(buff.take());
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error_code ec = _context.registry().parseFile(mb, _yamlFile);
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if (ec) {
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// Note: we need a way for Passes to report errors.
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llvm_unreachable("yaml reader not registered or read error");
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}
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File *objFile = _yamlFile[0].get();
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mergedFile.reset(new FileToMutable(_context, *objFile));
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}
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llvm::sys::fs::remove(tmpYAMLFile.str());
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}
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