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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/ReaderWriter.h"
16 #include "llvm/IR/LLVMContext.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 
main(int argc,char ** argv)38 int main(int argc, char **argv) {
39   LLVMContext &Context = getGlobalContext();
40   SMDiagnostic Err;
41   cl::ParseCommandLineOptions(argc, argv, "LLVM module splitter\n");
42 
43   std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
44 
45   if (!M) {
46     Err.print(argv[0], errs());
47     return 1;
48   }
49 
50   unsigned I = 0;
51   SplitModule(std::move(M), NumOutputs, [&](std::unique_ptr<Module> MPart) {
52     std::error_code EC;
53     std::unique_ptr<tool_output_file> Out(new tool_output_file(
54         OutputFilename + utostr(I++), EC, sys::fs::F_None));
55     if (EC) {
56       errs() << EC.message() << '\n';
57       exit(1);
58     }
59 
60     WriteBitcodeToFile(MPart.get(), Out->os());
61 
62     // Declare success.
63     Out->keep();
64   });
65 
66   return 0;
67 }
68