1 #include "llvm/ADT/OwningPtr.h"
2 #include "llvm/Bitcode/ReaderWriter.h"
3 #include "llvm/IR/Function.h"
4 #include "llvm/IR/GlobalVariable.h"
5 #include "llvm/IR/LLVMContext.h"
6 #include "llvm/IR/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/ErrorOr.h"
13 #include "llvm/Support/ToolOutputFile.h"
14 #include "llvm/Config/config.h"
15 
16 using namespace llvm;
17 
18 static cl::opt<std::string>
19 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
20 
21 static cl::opt<std::string>
22 OutputFilename("o", cl::desc("Output filename"),
23                cl::value_desc("filename"));
24 
25 int main(int argc, char **argv) {
26   LLVMContext &Context = getGlobalContext();
27   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
28 
29   cl::ParseCommandLineOptions(argc, argv, "libclc builtin preparation tool\n");
30 
31   std::string ErrorMessage;
32   std::auto_ptr<Module> M;
33 
34   {
35     OwningPtr<MemoryBuffer> BufferPtr;
36     if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
37       ErrorMessage = ec.message();
38     else {
39 #if LLVM_VERSION_MAJOR > 3 || (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR > 4)
40       ErrorOr<Module *> ModuleOrErr = parseBitcodeFile(BufferPtr.get(), Context);
41       if (error_code ec = ModuleOrErr.getError())
42         ErrorMessage = ec.message();
43       M.reset(ModuleOrErr.get());
44 #else
45       M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
46 #endif
47     }
48   }
49 
50   if (M.get() == 0) {
51     errs() << argv[0] << ": ";
52     if (ErrorMessage.size())
53       errs() << ErrorMessage << "\n";
54     else
55       errs() << "bitcode didn't read correctly.\n";
56     return 1;
57   }
58 
59   // Set linkage of every external definition to linkonce_odr.
60   for (Module::iterator i = M->begin(), e = M->end(); i != e; ++i) {
61     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
62       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
63   }
64 
65   for (Module::global_iterator i = M->global_begin(), e = M->global_end();
66        i != e; ++i) {
67     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
68       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
69   }
70 
71   if (OutputFilename.empty()) {
72     errs() << "no output file\n";
73     return 1;
74   }
75 
76   std::string ErrorInfo;
77   OwningPtr<tool_output_file> Out
78   (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
79 #if (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR == 4)
80                         sys::fs::F_Binary));
81 #elif LLVM_VERSION_MAJOR > 3 || (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5)
82                         sys::fs::F_None));
83 #else
84                         raw_fd_ostream::F_Binary));
85 #endif
86   if (!ErrorInfo.empty()) {
87     errs() << ErrorInfo << '\n';
88     exit(1);
89   }
90 
91   WriteBitcodeToFile(M.get(), Out->os());
92 
93   // Declare success.
94   Out->keep();
95   return 0;
96 }
97 
98