| 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 "Writer.h" |
| 24 | #include "lld/Common/LLVM.h" |
| 25 | #include "llvm/ADT/DenseSet.h" |
| 26 | #include "llvm/ADT/SmallString.h" |
| 27 | #include "llvm/Support/raw_ostream.h" |
| 28 | #include <memory> |
| 29 | #include <vector> |
| 30 | |
| 31 | namespace llvm { |
| 32 | namespace lto { |
| 33 | class LTO; |
| 34 | } |
| 35 | } // namespace llvm |
| 36 | |
| 37 | namespace lld::wasm { |
| 38 | |
| 39 | class BitcodeFile; |
| 40 | class InputFile; |
| 41 | |
| 42 | class BitcodeCompiler { |
| 43 | public: |
| 44 | BitcodeCompiler(); |
| 45 | ~BitcodeCompiler(); |
| 46 | |
| 47 | void add(BitcodeFile &f); |
| 48 | SmallVector<InputFile *, 0> compile(); |
| 49 | |
| 50 | private: |
| 51 | std::unique_ptr<llvm::lto::LTO> ltoObj; |
| 52 | // An array of (module name, native relocatable file content) pairs. |
| 53 | SmallVector<std::pair<std::string, SmallString<0>>, 0> buf; |
| 54 | std::vector<std::unique_ptr<MemoryBuffer>> files; |
| 55 | SmallVector<std::string, 0> filenames; |
| 56 | std::unique_ptr<llvm::raw_fd_ostream> indexFile; |
| 57 | llvm::DenseSet<StringRef> thinIndices; |
| 58 | }; |
| 59 | } // namespace lld::wasm |
| 60 | |
| 61 | #endif |
| 62 |