| 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::lto { |
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| 31 | class LTO; |
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| 32 | } |
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| 33 | |
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| 34 | namespace lld::elf { |
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| 35 | |
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| 36 | class BitcodeFile; |
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| 37 | class InputFile; |
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| 38 | |
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| 39 | class BitcodeCompiler { |
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| 40 | public: |
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| 41 | BitcodeCompiler(); |
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| 42 | ~BitcodeCompiler(); |
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| 43 | |
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| 44 | void add(BitcodeFile &f); |
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| 45 | std::vector<InputFile *> compile(); |
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| 46 | |
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| 47 | private: |
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| 48 | std::unique_ptr<llvm::lto::LTO> ltoObj; |
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| 49 | // An array of (module name, native relocatable file content) pairs. |
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| 50 | SmallVector<std::pair<std::string, SmallString<0>>, 0> buf; |
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| 51 | std::vector<std::unique_ptr<MemoryBuffer>> files; |
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| 52 | SmallVector<std::string, 0> filenames; |
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| 53 | llvm::DenseSet<StringRef> usedStartStop; |
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| 54 | std::unique_ptr<llvm::raw_fd_ostream> indexFile; |
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| 55 | llvm::DenseSet<StringRef> thinIndices; |
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| 56 | }; |
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| 57 | } // namespace lld::elf |
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| 58 | |
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| 59 | #endif |
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| 60 | |
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