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