1 //===- llvm-cat.cpp - LLVM module concatenation utility -------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This program is for testing features that rely on multi-module bitcode files. 11 // It takes a list of input modules and uses them to create a multi-module 12 // bitcode file. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #include "llvm/ADT/SmallVector.h" 17 #include "llvm/Bitcode/BitcodeReader.h" 18 #include "llvm/Bitcode/BitcodeWriter.h" 19 #include "llvm/IR/LLVMContext.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/IRReader/IRReader.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/Error.h" 24 #include "llvm/Support/FileSystem.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 #include "llvm/Support/SourceMgr.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include <algorithm> 29 #include <memory> 30 #include <string> 31 #include <system_error> 32 #include <vector> 33 34 using namespace llvm; 35 36 static cl::opt<bool> 37 BinaryCat("b", cl::desc("Whether to perform binary concatenation")); 38 39 static cl::opt<std::string> OutputFilename("o", cl::Required, 40 cl::desc("Output filename"), 41 cl::value_desc("filename")); 42 43 static cl::list<std::string> InputFilenames(cl::Positional, cl::ZeroOrMore, 44 cl::desc("<input files>")); 45 46 int main(int argc, char **argv) { 47 cl::ParseCommandLineOptions(argc, argv, "Module concatenation"); 48 49 ExitOnError ExitOnErr("llvm-cat: "); 50 LLVMContext Context; 51 52 SmallVector<char, 0> Buffer; 53 BitcodeWriter Writer(Buffer); 54 if (BinaryCat) { 55 for (const auto &InputFilename : InputFilenames) { 56 std::unique_ptr<MemoryBuffer> MB = ExitOnErr( 57 errorOrToExpected(MemoryBuffer::getFileOrSTDIN(InputFilename))); 58 std::vector<BitcodeModule> Mods = ExitOnErr(getBitcodeModuleList(*MB)); 59 for (auto &BitcodeMod : Mods) { 60 Buffer.insert(Buffer.end(), BitcodeMod.getBuffer().begin(), 61 BitcodeMod.getBuffer().end()); 62 Writer.copyStrtab(BitcodeMod.getStrtab()); 63 } 64 } 65 } else { 66 // The string table does not own strings added to it, some of which are 67 // owned by the modules; keep them alive until we write the string table. 68 std::vector<std::unique_ptr<Module>> OwnedMods; 69 for (const auto &InputFilename : InputFilenames) { 70 SMDiagnostic Err; 71 std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context); 72 if (!M) { 73 Err.print(argv[0], errs()); 74 return 1; 75 } 76 Writer.writeModule(*M); 77 OwnedMods.push_back(std::move(M)); 78 } 79 Writer.writeStrtab(); 80 } 81 82 std::error_code EC; 83 raw_fd_ostream OS(OutputFilename, EC, sys::fs::OpenFlags::F_None); 84 if (EC) { 85 errs() << argv[0] << ": cannot open " << OutputFilename << " for writing: " 86 << EC.message(); 87 return 1; 88 } 89 90 OS.write(Buffer.data(), Buffer.size()); 91 return 0; 92 } 93
