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1 //===- LTO.h ----------------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file provides a way to combine bitcode files into one ELF
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10 // file by compiling them using LLVM.
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11 //
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12 // If LTO is in use, your input files are not in regular ELF files
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13 // but instead LLVM bitcode files. In that case, the linker has to
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14 // convert bitcode files into the native format so that we can create
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15 // an ELF file that contains native code. This file provides that
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16 // functionality.
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17 //
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18 //===----------------------------------------------------------------------===//
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19
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20 #ifndef LLD_ELF_LTO_H
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21 #define LLD_ELF_LTO_H
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22
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23 #include "lld/Common/LLVM.h"
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24 #include "llvm/ADT/DenseSet.h"
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25 #include "llvm/ADT/SmallString.h"
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26 #include "llvm/Support/raw_ostream.h"
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27 #include <memory>
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28 #include <vector>
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29
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30 namespace llvm {
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31 namespace lto {
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32 class LTO;
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33 }
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34 } // namespace llvm
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35
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36 namespace lld {
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37 namespace elf {
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38
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39 class BitcodeFile;
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40 class InputFile;
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41 class LazyObjFile;
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42
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43 class BitcodeCompiler {
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44 public:
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45 BitcodeCompiler();
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46 ~BitcodeCompiler();
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47
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48 void add(BitcodeFile &f);
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49 std::vector<InputFile *> compile();
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50
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51 private:
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52 std::unique_ptr<llvm::lto::LTO> ltoObj;
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53 std::vector<SmallString<0>> buf;
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54 std::vector<std::unique_ptr<MemoryBuffer>> files;
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55 llvm::DenseSet<StringRef> usedStartStop;
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56 std::unique_ptr<llvm::raw_fd_ostream> indexFile;
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57 llvm::DenseSet<StringRef> thinIndices;
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58 };
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59 } // namespace elf
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60 } // namespace lld
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61
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62 #endif
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