-struct FunctionExtractorPass : public Pass {
- const char *getPassName() const { return "Function Extractor"; }
-
- bool run(Module &M) {
- // Mark all global variables to be internal
- for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
- I->setInternalLinkage(true);
-
- Function *Named = 0;
-
- // Loop over all of the functions in the module, dropping all references in
- // functions that are not the named function.
- for (Module::iterator I = M.begin(), E = M.end(); I != E;)
- // Check to see if this is the named function!
- if (!Named && I->getName() == ExtractFunc) {
- // Yes, it is. Keep track of it...
- Named = I;
-
- // Make sure it's globally accessable...
- Named->setInternalLinkage(false);
-
- // Remove the named function from the module.
- M.getFunctionList().remove(I);
- } else {
- // Nope it's not the named function, delete the body of the function
- I->dropAllReferences();
- ++I;
- }
-
- // All of the functions that still have uses now must be used by global
- // variables or the named function. Loop through them and create a new,
- // external function for the used ones... making all uses point to the new
- // functions.
- std::vector<Function*> NewFunctions;
-
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (!I->use_empty()) {
- Function *New = new Function(I->getFunctionType(), false, I->getName());
- I->replaceAllUsesWith(New);
- NewFunctions.push_back(New);
- }
-
- // Now the module only has unused functions with their references dropped.
- // Delete them all now!
- M.getFunctionList().clear();
-
- // Re-insert the named function...
- if (Named)
- M.getFunctionList().push_back(Named);
- else
- std::cerr << "Warning: Function '" << ExtractFunc << "' not found!\n";
-
- // Insert all of the function stubs...
- M.getFunctionList().insert(M.end(), NewFunctions.begin(),
- NewFunctions.end());
- return true;
+int main(int argc, char **argv) {
+ llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv, "llvm extractor\n");
+ sys::PrintStackTraceOnErrorSignal();
+
+ std::auto_ptr<Module> M;
+
+ MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename);
+ if (Buffer == 0) {
+ cerr << argv[0] << ": Error reading file '" + InputFilename + "'\n";
+ return 1;
+ } else {
+ M.reset(ParseBitcodeFile(Buffer));
+ }
+ delete Buffer;
+
+ if (M.get() == 0) {
+ cerr << argv[0] << ": bitcode didn't read correctly.\n";
+ return 1;