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 wasm 10 // file by compiling them using LLVM. 11 // 12 // If LTO is in use, your input files are not in regular wasm 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 wasm file that contains native code. This file provides that 16 // functionality. 17 // 18 //===----------------------------------------------------------------------===// 19 20 #ifndef LLD_WASM_LTO_H 21 #define LLD_WASM_LTO_H 22 23 #include "lld/Common/LLVM.h" 24 #include "llvm/ADT/SmallString.h" 25 #include "Writer.h" 26 #include <memory> 27 #include <vector> 28 29 namespace llvm { 30 namespace lto { 31 class LTO; 32 } 33 } // namespace llvm 34 35 namespace lld { 36 namespace wasm { 37 38 class BitcodeFile; 39 class InputFile; 40 41 class BitcodeCompiler { 42 public: 43 BitcodeCompiler(); 44 ~BitcodeCompiler(); 45 46 void add(BitcodeFile &f); 47 std::vector<StringRef> compile(); 48 49 private: 50 std::unique_ptr<llvm::lto::LTO> ltoObj; 51 std::vector<SmallString<0>> buf; 52 std::vector<std::unique_ptr<MemoryBuffer>> files; 53 }; 54 } // namespace wasm 55 } // namespace lld 56 57 #endif 58