1 //===-- llvm-strings.cpp - Printable String dumping utility ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This program is a utility that works like binutils "strings", that is, it 11 // prints out printable strings in a binary, objdump, or archive file. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/IR/LLVMContext.h" 16 #include "llvm/Object/Archive.h" 17 #include "llvm/Object/Binary.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Support/CommandLine.h" 20 #include "llvm/Support/Error.h" 21 #include "llvm/Support/MemoryBuffer.h" 22 #include "llvm/Support/PrettyStackTrace.h" 23 #include "llvm/Support/Program.h" 24 #include "llvm/Support/Signals.h" 25 #include <string> 26 27 using namespace llvm; 28 using namespace llvm::object; 29 30 static cl::list<std::string> InputFileNames(cl::Positional, 31 cl::desc("<input object files>"), 32 cl::ZeroOrMore); 33 34 static void dump(raw_ostream &OS, StringRef Contents) { 35 const char *S = nullptr; 36 for (const char *P = Contents.begin(), *E = Contents.end(); P < E; ++P) { 37 if (std::isgraph(*P) || std::isblank(*P)) { 38 if (S == nullptr) 39 S = P; 40 } else if (S) { 41 if (P - S > 3) 42 OS << StringRef(S, P - S) << '\n'; 43 S = nullptr; 44 } 45 } 46 } 47 48 namespace { 49 class Strings { 50 LLVMContext Context; 51 raw_ostream &OS; 52 53 void dump(const ObjectFile *O) { 54 for (const auto &S : O->sections()) { 55 StringRef Contents; 56 if (!S.getContents(Contents)) 57 ::dump(OS, Contents); 58 } 59 } 60 61 void dump(const Archive *A) { 62 Error E; 63 for (auto &Element : A->children(E)) { 64 if (Expected<std::unique_ptr<Binary>> Child = 65 Element.getAsBinary(&Context)) { 66 dump(dyn_cast<ObjectFile>(&**Child)); 67 } else { 68 if (auto E = isNotObjectErrorInvalidFileType(Child.takeError())) { 69 errs() << A->getFileName(); 70 if (Expected<StringRef> Name = Element.getName()) 71 errs() << '(' << *Name << ')'; 72 logAllUnhandledErrors(std::move(E), errs(), ""); 73 errs() << '\n'; 74 } 75 } 76 } 77 static_cast<bool>(E); 78 } 79 80 public: 81 Strings(raw_ostream &S) : OS(S) {} 82 83 void scan(StringRef File) { 84 ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = 85 MemoryBuffer::getFileOrSTDIN(File); 86 if (std::error_code EC = Buffer.getError()) { 87 errs() << File << ": " << EC.message() << '\n'; 88 return; 89 } 90 91 if (Expected<std::unique_ptr<Binary>> B = 92 createBinary(Buffer.get()->getMemBufferRef(), &Context)) { 93 if (auto *A = dyn_cast<Archive>(&**B)) 94 return dump(A); 95 if (auto *O = dyn_cast<ObjectFile>(&**B)) 96 return dump(O); 97 ::dump(OS, Buffer.get()->getMemBufferRef().getBuffer()); 98 } else { 99 consumeError(B.takeError()); 100 ::dump(OS, Buffer.get()->getMemBufferRef().getBuffer()); 101 } 102 } 103 }; 104 } 105 106 int main(int argc, char **argv) { 107 sys::PrintStackTraceOnErrorSignal(argv[0]); 108 PrettyStackTraceProgram X(argc, argv); 109 110 cl::ParseCommandLineOptions(argc, argv, "llvm string dumper\n"); 111 112 if (InputFileNames.empty()) 113 InputFileNames.push_back("-"); 114 115 Strings S(llvm::outs()); 116 std::for_each(InputFileNames.begin(), InputFileNames.end(), 117 [&S](StringRef F) { S.scan(F); }); 118 return EXIT_SUCCESS; 119 } 120 121