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 COFF 10// file by compiling them using LLVM. 11// 12// If LTO is in use, your input files are not in regular COFF 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// a COFF file that contains native code. This file provides that 16// functionality. 17// 18//===----------------------------------------------------------------------===// 19 20#ifndef LLD_COFF_LTO_H 21#define LLD_COFF_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 { 31struct Config; 32class LTO; 33} 34 35namespace lld::coff { 36 37class BitcodeFile; 38class InputFile; 39class COFFLinkerContext; 40 41class BitcodeCompiler { 42public: 43 BitcodeCompiler(COFFLinkerContext &ctx); 44 ~BitcodeCompiler(); 45 46 void add(BitcodeFile &f); 47 std::vector<InputFile *> compile(); 48 49private: 50 std::unique_ptr<llvm::lto::LTO> ltoObj; 51 std::vector<std::pair<std::string, SmallString<0>>> buf; 52 std::vector<std::unique_ptr<MemoryBuffer>> files; 53 std::vector<std::string> file_names; 54 std::unique_ptr<llvm::raw_fd_ostream> indexFile; 55 llvm::DenseSet<StringRef> thinIndices; 56 57 std::string getThinLTOOutputFile(StringRef path); 58 llvm::lto::Config createConfig(); 59 60 COFFLinkerContext &ctx; 61}; 62} 63 64#endif 65