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1 //===- LTO.h ----------------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file provides a way to combine bitcode files into one wasm
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10 // file by compiling them using LLVM.
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11 //
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12 // If LTO is in use, your input files are not in regular wasm files
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13 // but instead LLVM bitcode files. In that case, the linker has to
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14 // convert bitcode files into the native format so that we can create
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15 // a wasm file that contains native code. This file provides that
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16 // functionality.
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17 //
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18 //===----------------------------------------------------------------------===//
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19
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20 #ifndef LLD_WASM_LTO_H
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21 #define LLD_WASM_LTO_H
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22
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23 #include "lld/Common/LLVM.h"
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24 #include "llvm/ADT/SmallString.h"
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25 #include "Writer.h"
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26 #include <memory>
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27 #include <vector>
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28
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29 namespace llvm {
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30 namespace lto {
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31 class LTO;
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32 }
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33 } // namespace llvm
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34
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35 namespace lld {
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36 namespace wasm {
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37
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38 class BitcodeFile;
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39 class InputFile;
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40
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41 class BitcodeCompiler {
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42 public:
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43 BitcodeCompiler();
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44 ~BitcodeCompiler();
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45
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46 void add(BitcodeFile &f);
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47 std::vector<StringRef> compile();
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48
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49 private:
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50 std::unique_ptr<llvm::lto::LTO> ltoObj;
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51 std::vector<SmallString<0>> buf;
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52 std::vector<std::unique_ptr<MemoryBuffer>> files;
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53 };
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54 } // namespace wasm
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55 } // namespace lld
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56
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57 #endif
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