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
main(int argc,char ** argv)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 if (verifyModule(*MPart, &errs())) {
65 errs() << "Broken module!\n";
66 exit(1);
67 }
68
69 WriteBitcodeToFile(*MPart, Out->os());
70
71 // Declare success.
72 Out->keep();
73 }, PreserveLocals);
74
75 return 0;
76 }
77