lld/wasm/LTO.h

   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::wasm {
  36
  37 class BitcodeFile;
  38 class InputFile;
  39
  40 class BitcodeCompiler {
  41 public:
  42   BitcodeCompiler();
  43   ~BitcodeCompiler();
  44
  45   void add(BitcodeFile &f);
  46   std::vector<StringRef> compile();
  47
  48 private:
  49   std::unique_ptr<llvm::lto::LTO> ltoObj;
  50   std::vector<SmallString<0>> buf;
  51   std::vector<std::unique_ptr<MemoryBuffer>> files;
  52 };
  53 } // namespace lld::wasm
  54
  55 #endif