1 #include "llvm/ADT/OwningPtr.h"
2 #include "llvm/Bitcode/ReaderWriter.h"
3 #include "llvm/Function.h"
4 #include "llvm/GlobalVariable.h"
5 #include "llvm/LLVMContext.h"
6 #include "llvm/Module.h"
7 #include "llvm/Support/CommandLine.h"
8 #include "llvm/Support/ManagedStatic.h"
9 #include "llvm/Support/MemoryBuffer.h"
10 #include "llvm/Support/raw_ostream.h"
11 #include "llvm/Support/system_error.h"
12 #include "llvm/Support/ToolOutputFile.h"
13 
14 using namespace llvm;
15 
16 static cl::opt<std::string>
17 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
18 
19 static cl::opt<std::string>
20 OutputFilename("o", cl::desc("Output filename"),
21                cl::value_desc("filename"));
22 
23 int main(int argc, char **argv) {
24   LLVMContext &Context = getGlobalContext();
25   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
26 
27   cl::ParseCommandLineOptions(argc, argv, "libclc builtin preparation tool\n");
28 
29   std::string ErrorMessage;
30   std::auto_ptr<Module> M;
31 
32   {
33     OwningPtr<MemoryBuffer> BufferPtr;
34     if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
35       ErrorMessage = ec.message();
36     else
37       M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
38   }
39 
40   if (M.get() == 0) {
41     errs() << argv[0] << ": ";
42     if (ErrorMessage.size())
43       errs() << ErrorMessage << "\n";
44     else
45       errs() << "bitcode didn't read correctly.\n";
46     return 1;
47   }
48 
49   // Set linkage of every external definition to linkonce_odr.
50   for (Module::iterator i = M->begin(), e = M->end(); i != e; ++i) {
51     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
52       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
53   }
54 
55   for (Module::global_iterator i = M->global_begin(), e = M->global_end();
56        i != e; ++i) {
57     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
58       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
59   }
60 
61   if (OutputFilename.empty()) {
62     errs() << "no output file\n";
63     return 1;
64   }
65 
66   std::string ErrorInfo;
67   OwningPtr<tool_output_file> Out
68   (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
69                         raw_fd_ostream::F_Binary));
70   if (!ErrorInfo.empty()) {
71     errs() << ErrorInfo << '\n';
72     exit(1);
73   }
74 
75   WriteBitcodeToFile(M.get(), Out->os());
76 
77   // Declare success.
78   Out->keep();
79   return 0;
80 }
81 
82