1/* 2 * Copyright 2013, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "llvm/Bitcode/ReaderWriter.h" 18#include "llvm/IR/LLVMContext.h" 19#include "llvm/IR/Module.h" 20#include "llvm/IR/Verifier.h" 21#include "llvm/IRReader/IRReader.h" 22#include "llvm/Pass.h" 23#include "llvm/PassManager.h" 24#include "llvm/Support/CommandLine.h" 25#include "llvm/Support/FileSystem.h" 26#include "llvm/Support/ManagedStatic.h" 27#include "llvm/Support/PrettyStackTrace.h" 28#include "llvm/Support/Signals.h" 29#include "llvm/Support/SourceMgr.h" 30#include "llvm/Support/SystemUtils.h" 31#include "llvm/Support/ToolOutputFile.h" 32using namespace llvm; 33 34static cl::list<std::string> 35InputFilenames(cl::Positional, 36 cl::desc("<input bitcode files>")); 37 38static cl::opt<std::string> 39OutputFilename("o", cl::desc("Override output filename"), cl::init("-"), 40 cl::value_desc("filename")); 41 42static cl::opt<bool> 43OutputAssembly("S", 44 cl::desc("Write output as LLVM assembly"), cl::Hidden); 45 46namespace { 47 class StripAttributes : public ModulePass { 48 public: 49 static char ID; 50 51 StripAttributes() : ModulePass(ID) { 52 } 53 54 bool runOnFunction(Function &F) { 55 // Remove any target-cpu and/or target-features attributes from each 56 // Function or Function declaration. 57 if (F.hasFnAttribute("target-cpu") || 58 F.hasFnAttribute("target-features")) { 59 60 AttrBuilder B; 61 B.addAttribute("target-cpu").addAttribute("target-features"); 62 AttributeSet ToStrip = AttributeSet::get(F.getContext(), 63 AttributeSet::FunctionIndex, B); 64 F.removeAttributes(AttributeSet::FunctionIndex, ToStrip); 65 return true; 66 } 67 return false; 68 } 69 70 // We have to use a ModulePass, since a FunctionPass only gets run on 71 // defined Functions (and not declared Functions). 72 virtual bool runOnModule(Module &M) { 73 bool Changed = false; 74 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) { 75 Changed |= runOnFunction(*I); 76 } 77 return Changed; 78 } 79 }; 80 81 llvm::ModulePass * createStripAttributePass() { 82 return new StripAttributes(); 83 } 84} 85 86 87char StripAttributes::ID = 0; 88static RegisterPass<StripAttributes> RPSA("StripAttributes", 89 "Strip Function Attributes Pass"); 90 91 92static inline std::unique_ptr<Module> LoadFile(const char *argv0, 93 const std::string &FN, 94 LLVMContext& Context) { 95 SMDiagnostic Err; 96 Module* Result = ParseIRFile(FN, Err, Context); 97 if (Result) { 98 return std::unique_ptr<Module>(Result); // Load successful! 99 } 100 101 Err.print(argv0, errs()); 102 return std::unique_ptr<Module>(); 103} 104 105 106int main(int argc, char **argv) { 107 // Print a stack trace if we signal out. 108 sys::PrintStackTraceOnErrorSignal(); 109 PrettyStackTraceProgram X(argc, argv); 110 111 LLVMContext &Context = getGlobalContext(); 112 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 113 cl::ParseCommandLineOptions(argc, argv, "strip function attribute pass\n"); 114 115 std::string ErrorMessage; 116 117 std::unique_ptr<Module> M(LoadFile(argv[0], InputFilenames[0], Context)); 118 if (M.get() == 0) { 119 errs() << argv[0] << ": error loading file '" 120 << InputFilenames[0] << "'\n"; 121 return 1; 122 } 123 124 // Perform the actual function attribute stripping. 125 PassManager PM; 126 PM.add(createStripAttributePass()); 127 PM.run(*M.get()); 128 129 std::string ErrorInfo; 130 tool_output_file Out(OutputFilename.c_str(), ErrorInfo, 131 sys::fs::F_None); 132 if (!ErrorInfo.empty()) { 133 errs() << ErrorInfo << '\n'; 134 return 1; 135 } 136 137 if (verifyModule(*M)) { 138 errs() << argv[0] << ": stripped module is broken!\n"; 139 return 1; 140 } 141 142 if (OutputAssembly) { 143 Out.os() << *M; 144 } else if (!CheckBitcodeOutputToConsole(Out.os(), true)) { 145 WriteBitcodeToFile(M.get(), Out.os()); 146 } 147 148 Out.keep(); 149 150 return 0; 151} 152