tools/llvm-split/llvm-split.cpp

   1 //===-- llvm-split: command line tool for testing module splitter ---------===//
   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 can be used to test the llvm::SplitModule function.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ADT/StringExtras.h"
  15 #include "llvm/Bitcode/BitcodeWriter.h"
  16 #include "llvm/IR/LLVMContext.h"
  17 #include "llvm/IR/Verifier.h"
  18 #include "llvm/IRReader/IRReader.h"
  19 #include "llvm/Support/CommandLine.h"
  20 #include "llvm/Support/FileSystem.h"
  21 #include "llvm/Support/SourceMgr.h"
  22 #include "llvm/Support/ToolOutputFile.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 #include "llvm/Transforms/Utils/SplitModule.h"
  25
  26 using namespace llvm;
  27
  28 static cl::opt<std::string>
  29 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
  30     cl::init("-"), cl::value_desc("filename"));
  31
  32 static cl::opt<std::string>
  33 OutputFilename("o", cl::desc("Override output filename"),
  34                cl::value_desc("filename"));
  35
  36 static cl::opt<unsigned> NumOutputs("j", cl::Prefix, cl::init(2),
  37                                     cl::desc("Number of output files"));
  38
  39 static cl::opt<bool>
  40     PreserveLocals("preserve-locals", cl::Prefix, cl::init(false),
  41                    cl::desc("Split without externalizing locals"));
  42
  43 int main(int argc, char **argv) {
  44   LLVMContext Context;
  45   SMDiagnostic Err;
  46   cl::ParseCommandLineOptions(argc, argv, "LLVM module splitter\n");
  47
  48   std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
  49
  50   if (!M) {
  51     Err.print(argv[0], errs());
  52     return 1;
  53   }
  54
  55   unsigned I = 0;
  56   SplitModule(std::move(M), NumOutputs, [&](std::unique_ptr<Module> MPart) {
  57     std::error_code EC;
  58     std::unique_ptr<tool_output_file> Out(new tool_output_file(
  59         OutputFilename + utostr(I++), EC, sys::fs::F_None));
  60     if (EC) {
  61       errs() << EC.message() << '\n';
  62       exit(1);
  63     }
  64
  65     verifyModule(*MPart);
  66     WriteBitcodeToFile(MPart.get(), Out->os());
  67
  68     // Declare success.
  69     Out->keep();
  70   }, PreserveLocals);
  71
  72   return 0;
  73 }