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 30namespace llvm::lto { 31class LTO; 32} 33 34namespace lld::elf { 35 36class BitcodeFile; 37class InputFile; 38 39class BitcodeCompiler { 40public: 41 BitcodeCompiler(); 42 ~BitcodeCompiler(); 43 44 void add(BitcodeFile &f); 45 std::vector<InputFile *> compile(); 46 47private: 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