1 files changed, 81 insertions, 0 deletions
diff --git a/utils/prepare-builtins.cpp b/utils/prepare-builtins.cpp
new file mode 100644
index 0000000..ae7731b
--- /dev/null
+++ b/utils/prepare-builtins.cpp
@@ -0,0 +1,81 @@
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Function.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/system_error.h"
+#include "llvm/Support/ToolOutputFile.h"
+
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"),
+               cl::value_desc("filename"));
+
+int main(int argc, char **argv) {
+  LLVMContext &Context = getGlobalContext();
+  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
+
+  cl::ParseCommandLineOptions(argc, argv, "libclc builtin preparation tool\n");
+
+  std::string ErrorMessage;
+  std::auto_ptr<Module> M;
+
+  {
+    OwningPtr<MemoryBuffer> BufferPtr;
+    if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
+      ErrorMessage = ec.message();
+    else
+      M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
+  }
+
+  if (M.get() == 0) {
+    errs() << argv[0] << ": ";
+    if (ErrorMessage.size())
+      errs() << ErrorMessage << "\n";
+    else
+      errs() << "bitcode didn't read correctly.\n";
+    return 1;
+  }
+
+  // Set linkage of every external definition to linkonce_odr.
+  for (Module::iterator i = M->begin(), e = M->end(); i != e; ++i) {
+    if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
+      i->setLinkage(GlobalValue::LinkOnceODRLinkage);
+  }
+
+  for (Module::global_iterator i = M->global_begin(), e = M->global_end();
+       i != e; ++i) {
+    if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
+      i->setLinkage(GlobalValue::LinkOnceODRLinkage);
+  }
+
+  if (OutputFilename.empty()) {
+    errs() << "no output file\n";
+    return 1;
+  }
+
+  std::string ErrorInfo;
+  OwningPtr<tool_output_file> Out
+  (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
+                        raw_fd_ostream::F_Binary));
+  if (!ErrorInfo.empty()) {
+    errs() << ErrorInfo << '\n';
+    exit(1);
+  }
+
+  WriteBitcodeToFile(M.get(), Out->os());
+
+  // Declare success.
+  Out->keep();
+  return 0;
+}
+