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1 //===-- llvm-modextract.cpp - LLVM module extractor utility ---------------===//
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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 program is for testing features that rely on multi-module bitcode files.
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10 // It takes a multi-module bitcode file, extracts one of the modules and writes
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11 // it to the output file.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Bitcode/BitcodeReader.h"
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16 #include "llvm/Bitcode/BitcodeWriter.h"
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17 #include "llvm/Support/CommandLine.h"
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18 #include "llvm/Support/Error.h"
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19 #include "llvm/Support/FileSystem.h"
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20 #include "llvm/Support/ToolOutputFile.h"
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21
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22 using namespace llvm;
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23
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24 static cl::opt<bool>
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25 BinaryExtract("b", cl::desc("Whether to perform binary extraction"));
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26
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27 static cl::opt<std::string> OutputFilename("o", cl::Required,
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28 cl::desc("Output filename"),
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29 cl::value_desc("filename"));
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30
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31 static cl::opt<std::string>
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32 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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33
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34 static cl::opt<unsigned> ModuleIndex("n", cl::Required,
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35 cl::desc("Index of module to extract"),
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36 cl::value_desc("index"));
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37
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38 int main(int argc, char **argv) {
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39 cl::ParseCommandLineOptions(argc, argv, "Module extractor");
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40
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41 ExitOnError ExitOnErr("llvm-modextract: error: ");
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42
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43 std::unique_ptr<MemoryBuffer> MB =
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44 ExitOnErr(errorOrToExpected(MemoryBuffer::getFileOrSTDIN(InputFilename)));
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45 std::vector<BitcodeModule> Ms = ExitOnErr(getBitcodeModuleList(*MB));
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46
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47 LLVMContext Context;
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48 if (ModuleIndex >= Ms.size()) {
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49 errs() << "llvm-modextract: error: module index out of range; bitcode file "
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50 "contains "
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51 << Ms.size() << " module(s)\n";
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52 return 1;
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53 }
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54
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55 std::error_code EC;
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56 std::unique_ptr<ToolOutputFile> Out(
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57 new ToolOutputFile(OutputFilename, EC, sys::fs::OF_None));
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58 ExitOnErr(errorCodeToError(EC));
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59
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60 if (BinaryExtract) {
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61 SmallVector<char, 0> Result;
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62 BitcodeWriter Writer(Result);
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63 Result.append(Ms[ModuleIndex].getBuffer().begin(),
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64 Ms[ModuleIndex].getBuffer().end());
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65 Writer.copyStrtab(Ms[ModuleIndex].getStrtab());
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66 Out->os() << Result;
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67 Out->keep();
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68 return 0;
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69 }
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70
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71 std::unique_ptr<Module> M = ExitOnErr(Ms[ModuleIndex].parseModule(Context));
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72 WriteBitcodeToFile(*M, Out->os());
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73
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74 Out->keep();
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75 return 0;
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76 }
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