llvm/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/Support/WithColor.h"
  24 #include "llvm/Transforms/Utils/SplitModule.h"
  25
  26 using namespace llvm;
  27
  28 static cl::OptionCategory SplitCategory("Split Options");
  29
  30 static cl::opt<std::string> InputFilename(cl::Positional,
  31                                           cl::desc("<input bitcode file>"),
  32                                           cl::init("-"),
  33                                           cl::value_desc("filename"),
  34                                           cl::cat(SplitCategory));
  35
  36 static cl::opt<std::string> OutputFilename("o",
  37                                            cl::desc("Override output filename"),
  38                                            cl::value_desc("filename"),
  39                                            cl::cat(SplitCategory));
  40
  41 static cl::opt<unsigned> NumOutputs("j", cl::Prefix, cl::init(2),
  42                                     cl::desc("Number of output files"),
  43                                     cl::cat(SplitCategory));
  44
  45 static cl::opt<bool>
  46     PreserveLocals("preserve-locals", cl::Prefix, cl::init(false),
  47                    cl::desc("Split without externalizing locals"),
  48                    cl::cat(SplitCategory));
  49
  50 int main(int argc, char **argv) {
  51   LLVMContext Context;
  52   SMDiagnostic Err;
  53   cl::HideUnrelatedOptions({&SplitCategory, &getColorCategory()});
  54   cl::ParseCommandLineOptions(argc, argv, "LLVM module splitter\n");
  55
  56   std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
  57
  58   if (!M) {
  59     Err.print(argv[0], errs());
  60     return 1;
  61   }
  62
  63   unsigned I = 0;
  64   SplitModule(
  65       *M, NumOutputs,
  66       [&](std::unique_ptr<Module> MPart) {
  67         std::error_code EC;
  68         std::unique_ptr<ToolOutputFile> Out(new ToolOutputFile(
  69             OutputFilename + utostr(I++), EC, sys::fs::OF_None));
  70         if (EC) {
  71           errs() << EC.message() << '\n';
  72           exit(1);
  73         }
  74
  75         if (verifyModule(*MPart, &errs())) {
  76           errs() << "Broken module!\n";
  77           exit(1);
  78         }
  79
  80         WriteBitcodeToFile(*MPart, Out->os());
  81
  82         // Declare success.
  83         Out->keep();
  84       },
  85       PreserveLocals);
  86
  87   return 0;
  88 }