| //===- llvm-extract.cpp - LLVM function extraction utility ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This utility changes the input module to only contain a single function, |
| // which is primarily used for debugging transformations. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/LLVMContext.h" |
| #include "llvm/Module.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/Bitcode/ReaderWriter.h" |
| #include "llvm/Transforms/IPO.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/PrettyStackTrace.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/System/Signals.h" |
| #include <memory> |
| using namespace llvm; |
| |
| // InputFilename - The filename to read from. |
| static cl::opt<std::string> |
| InputFilename(cl::Positional, cl::desc("<input bitcode file>"), |
| cl::init("-"), cl::value_desc("filename")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::desc("Specify output filename"), |
| cl::value_desc("filename"), cl::init("-")); |
| |
| static cl::opt<bool> |
| Force("f", cl::desc("Overwrite output files")); |
| |
| static cl::opt<bool> |
| DeleteFn("delete", cl::desc("Delete specified Globals from Module")); |
| |
| static cl::opt<bool> |
| Relink("relink", |
| cl::desc("Turn external linkage for callees of function to delete")); |
| |
| // ExtractFunc - The function to extract from the module... |
| static cl::opt<std::string> |
| ExtractFunc("func", cl::desc("Specify function to extract"), cl::init(""), |
| cl::value_desc("function")); |
| |
| // ExtractGlobal - The global to extract from the module... |
| static cl::opt<std::string> |
| ExtractGlobal("glob", cl::desc("Specify global to extract"), cl::init(""), |
| cl::value_desc("global")); |
| |
| int main(int argc, char **argv) { |
| // Print a stack trace if we signal out. |
| sys::PrintStackTraceOnErrorSignal(); |
| PrettyStackTraceProgram X(argc, argv); |
| |
| LLVMContext &Context = getGlobalContext(); |
| llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. |
| cl::ParseCommandLineOptions(argc, argv, "llvm extractor\n"); |
| |
| std::auto_ptr<Module> M; |
| |
| MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename); |
| if (Buffer == 0) { |
| errs() << argv[0] << ": Error reading file '" + InputFilename + "'\n"; |
| return 1; |
| } else { |
| M.reset(ParseBitcodeFile(Buffer, Context)); |
| } |
| delete Buffer; |
| |
| if (M.get() == 0) { |
| errs() << argv[0] << ": bitcode didn't read correctly.\n"; |
| return 1; |
| } |
| |
| // Figure out which function we should extract |
| GlobalVariable *G = !ExtractGlobal.empty() ? |
| M.get()->getNamedGlobal(ExtractGlobal) : 0; |
| |
| // Figure out which function we should extract |
| if (ExtractFunc.empty() && ExtractGlobal.empty()) ExtractFunc = "main"; |
| Function *F = M.get()->getFunction(ExtractFunc); |
| |
| if (F == 0 && G == 0) { |
| errs() << argv[0] << ": program doesn't contain function named '" |
| << ExtractFunc << "' or a global named '" << ExtractGlobal << "'!\n"; |
| return 1; |
| } |
| |
| // In addition to deleting all other functions, we also want to spiff it |
| // up a little bit. Do this now. |
| PassManager Passes; |
| Passes.add(new TargetData(M.get())); // Use correct TargetData |
| // Either isolate the function or delete it from the Module |
| std::vector<GlobalValue*> GVs; |
| if (F) GVs.push_back(F); |
| if (G) GVs.push_back(G); |
| |
| Passes.add(createGVExtractionPass(GVs, DeleteFn, Relink)); |
| if (!DeleteFn) |
| Passes.add(createGlobalDCEPass()); // Delete unreachable globals |
| Passes.add(createDeadTypeEliminationPass()); // Remove dead types... |
| Passes.add(createStripDeadPrototypesPass()); // Remove dead func decls |
| |
| raw_ostream *Out = 0; |
| |
| if (OutputFilename != "-") { // Not stdout? |
| std::string ErrorInfo; |
| Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true, |
| Force, ErrorInfo); |
| if (!ErrorInfo.empty()) { |
| errs() << ErrorInfo << '\n'; |
| if (!Force) |
| errs() << "Use -f command line argument to force output\n"; |
| delete Out; |
| return 1; |
| } |
| } else { // Specified stdout |
| // FIXME: errs() is not binary! |
| Out = &errs(); |
| } |
| |
| Passes.add(createBitcodeWriterPass(*Out)); |
| Passes.run(*M.get()); |
| |
| if (Out != &errs()) |
| delete Out; |
| return 0; |
| } |