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
29namespace llvm {
30namespace lto {
31class LTO;
32}
33} // namespace llvm
34
35namespace lld {
36namespace wasm {
37
38class BitcodeFile;
39class InputFile;
40
41class BitcodeCompiler {
42public:
43  BitcodeCompiler();
44  ~BitcodeCompiler();
45
46  void add(BitcodeFile &f);
47  std::vector<StringRef> compile();
48
49private:
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