tools/llvm-split/llvm-split.cpp

   1 //===-- llvm-split: command line tool for testing module splitter ---------===//
   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 program can be used to test the llvm::SplitModule function.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/ADT/StringExtras.h"
  14 #include "llvm/Bitcode/BitcodeWriter.h"
  15 #include "llvm/IR/LLVMContext.h"
  16 #include "llvm/IR/Verifier.h"
  17 #include "llvm/IRReader/IRReader.h"
  18 #include "llvm/Support/CommandLine.h"
  19 #include "llvm/Support/FileSystem.h"
  20 #include "llvm/Support/SourceMgr.h"
  21 #include "llvm/Support/ToolOutputFile.h"
  22 #include "llvm/Support/raw_ostream.h"
  23 #include "llvm/Transforms/Utils/SplitModule.h"
  24
  25 using namespace llvm;
  26
  27 static cl::opt<std::string>
  28 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
  29     cl::init("-"), cl::value_desc("filename"));
  30
  31 static cl::opt<std::string>
  32 OutputFilename("o", cl::desc("Override output filename"),
  33                cl::value_desc("filename"));
  34
  35 static cl::opt<unsigned> NumOutputs("j", cl::Prefix, cl::init(2),
  36                                     cl::desc("Number of output files"));
  37
  38 static cl::opt<bool>
  39     PreserveLocals("preserve-locals", cl::Prefix, cl::init(false),
  40                    cl::desc("Split without externalizing locals"));
  41
  42 int main(int argc, char **argv) {
  43   LLVMContext Context;
  44   SMDiagnostic Err;
  45   cl::ParseCommandLineOptions(argc, argv, "LLVM module splitter\n");
  46
  47   std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
  48
  49   if (!M) {
  50     Err.print(argv[0], errs());
  51     return 1;
  52   }
  53
  54   unsigned I = 0;
  55   SplitModule(std::move(M), NumOutputs, [&](std::unique_ptr<Module> MPart) {
  56     std::error_code EC;
  57     std::unique_ptr<ToolOutputFile> Out(
  58         new ToolOutputFile(OutputFilename + utostr(I++), EC, sys::fs::OF_None));
  59     if (EC) {
  60       errs() << EC.message() << '\n';
  61       exit(1);
  62     }
  63
  64     verifyModule(*MPart);
  65     WriteBitcodeToFile(*MPart, Out->os());
  66
  67     // Declare success.
  68     Out->keep();
  69   }, PreserveLocals);
  70
  71   return 0;
  72 }