| /* |
| * Copyright 2013, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "llvm/Bitcode/ReaderWriter.h" |
| #include "llvm/IR/LLVMContext.h" |
| #include "llvm/IR/LegacyPassManager.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/Verifier.h" |
| #include "llvm/IRReader/IRReader.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/PrettyStackTrace.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/SystemUtils.h" |
| #include "llvm/Support/ToolOutputFile.h" |
| using namespace llvm; |
| |
| static cl::list<std::string> |
| InputFilenames(cl::Positional, |
| cl::desc("<input bitcode files>")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::desc("Override output filename"), cl::init("-"), |
| cl::value_desc("filename")); |
| |
| static cl::opt<bool> |
| OutputAssembly("S", |
| cl::desc("Write output as LLVM assembly"), cl::Hidden); |
| |
| namespace { |
| class StripAttributes : public ModulePass { |
| public: |
| static char ID; |
| |
| StripAttributes() : ModulePass(ID) { |
| } |
| |
| virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override { |
| AU.setPreservesAll(); |
| } |
| |
| bool runOnFunction(Function &F) { |
| // Remove any target-cpu and/or target-features attributes from each |
| // Function or Function declaration. |
| if (F.hasFnAttribute("target-cpu") || |
| F.hasFnAttribute("target-features")) { |
| |
| AttrBuilder B; |
| B.addAttribute("target-cpu").addAttribute("target-features"); |
| AttributeSet ToStrip = AttributeSet::get(F.getContext(), |
| AttributeSet::FunctionIndex, B); |
| F.removeAttributes(AttributeSet::FunctionIndex, ToStrip); |
| return true; |
| } |
| return false; |
| } |
| |
| // We have to use a ModulePass, since a FunctionPass only gets run on |
| // defined Functions (and not declared Functions). |
| virtual bool runOnModule(Module &M) { |
| bool Changed = false; |
| for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) { |
| Changed |= runOnFunction(*I); |
| } |
| return Changed; |
| } |
| }; |
| |
| llvm::ModulePass * createStripAttributePass() { |
| return new StripAttributes(); |
| } |
| } |
| |
| |
| char StripAttributes::ID = 0; |
| static RegisterPass<StripAttributes> RPSA("StripAttributes", |
| "Strip Function Attributes Pass"); |
| |
| |
| static inline std::unique_ptr<Module> LoadFile(const char *argv0, |
| const std::string &FN, |
| LLVMContext& Context) { |
| SMDiagnostic Err; |
| std::unique_ptr<Module> Result = parseIRFile(FN, Err, Context); |
| if (Result) { |
| return Result; // Load successful! |
| } |
| |
| Err.print(argv0, errs()); |
| return std::unique_ptr<Module>(); |
| } |
| |
| |
| int main(int argc, char **argv) { |
| // Print a stack trace if we signal out. |
| sys::PrintStackTraceOnErrorSignal(argv[0]); |
| PrettyStackTraceProgram X(argc, argv); |
| |
| LLVMContext Context; |
| llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. |
| cl::ParseCommandLineOptions(argc, argv, "strip function attribute pass\n"); |
| |
| std::string ErrorMessage; |
| |
| std::unique_ptr<Module> M(LoadFile(argv[0], InputFilenames[0], Context)); |
| if (M.get() == 0) { |
| errs() << argv[0] << ": error loading file '" |
| << InputFilenames[0] << "'\n"; |
| return 1; |
| } |
| |
| // Perform the actual function attribute stripping. |
| legacy::PassManager PM; |
| PM.add(createStripAttributePass()); |
| PM.run(*M.get()); |
| |
| std::error_code EC; |
| tool_output_file Out(OutputFilename.c_str(), EC, |
| sys::fs::F_None); |
| if (EC) { |
| errs() << EC.message() << '\n'; |
| return 1; |
| } |
| |
| if (verifyModule(*M)) { |
| errs() << argv[0] << ": stripped module is broken!\n"; |
| return 1; |
| } |
| |
| if (OutputAssembly) { |
| Out.os() << *M; |
| } else if (!CheckBitcodeOutputToConsole(Out.os(), true)) { |
| WriteBitcodeToFile(M.get(), Out.os()); |
| } |
| |
| Out.keep(); |
| |
| return 0; |
| } |