1 //===-- llvm-c++filt.cpp --------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/ADT/StringExtras.h" 10 #include "llvm/ADT/Triple.h" 11 #include "llvm/Demangle/Demangle.h" 12 #include "llvm/Option/Arg.h" 13 #include "llvm/Option/ArgList.h" 14 #include "llvm/Option/Option.h" 15 #include "llvm/Support/CommandLine.h" 16 #include "llvm/Support/Host.h" 17 #include "llvm/Support/InitLLVM.h" 18 #include "llvm/Support/WithColor.h" 19 #include "llvm/Support/raw_ostream.h" 20 #include <cstdlib> 21 #include <iostream> 22 23 using namespace llvm; 24 25 namespace { 26 enum ID { 27 OPT_INVALID = 0, // This is not an option ID. 28 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \ 29 HELPTEXT, METAVAR, VALUES) \ 30 OPT_##ID, 31 #include "Opts.inc" 32 #undef OPTION 33 }; 34 35 #define PREFIX(NAME, VALUE) \ 36 static constexpr llvm::StringLiteral NAME##_init[] = VALUE; \ 37 static constexpr llvm::ArrayRef<llvm::StringLiteral> NAME( \ 38 NAME##_init, std::size(NAME##_init) - 1); 39 #include "Opts.inc" 40 #undef PREFIX 41 42 static constexpr opt::OptTable::Info InfoTable[] = { 43 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM, \ 44 HELPTEXT, METAVAR, VALUES) \ 45 { \ 46 PREFIX, NAME, HELPTEXT, \ 47 METAVAR, OPT_##ID, opt::Option::KIND##Class, \ 48 PARAM, FLAGS, OPT_##GROUP, \ 49 OPT_##ALIAS, ALIASARGS, VALUES}, 50 #include "Opts.inc" 51 #undef OPTION 52 }; 53 54 class CxxfiltOptTable : public opt::GenericOptTable { 55 public: 56 CxxfiltOptTable() : opt::GenericOptTable(InfoTable) { 57 setGroupedShortOptions(true); 58 } 59 }; 60 } // namespace 61 62 static bool StripUnderscore; 63 static bool Types; 64 65 static StringRef ToolName; 66 67 static void error(const Twine &Message) { 68 WithColor::error(errs(), ToolName) << Message << '\n'; 69 exit(1); 70 } 71 72 static std::string demangle(const std::string &Mangled) { 73 const char *DecoratedStr = Mangled.c_str(); 74 if (StripUnderscore) 75 if (DecoratedStr[0] == '_') 76 ++DecoratedStr; 77 78 std::string Result; 79 if (nonMicrosoftDemangle(DecoratedStr, Result)) 80 return Result; 81 82 std::string Prefix; 83 char *Undecorated = nullptr; 84 85 if (Types) 86 Undecorated = itaniumDemangle(DecoratedStr, nullptr, nullptr, nullptr); 87 88 if (!Undecorated && strncmp(DecoratedStr, "__imp_", 6) == 0) { 89 Prefix = "import thunk for "; 90 Undecorated = itaniumDemangle(DecoratedStr + 6, nullptr, nullptr, nullptr); 91 } 92 93 Result = Undecorated ? Prefix + Undecorated : Mangled; 94 free(Undecorated); 95 return Result; 96 } 97 98 // Split 'Source' on any character that fails to pass 'IsLegalChar'. The 99 // returned vector consists of pairs where 'first' is the delimited word, and 100 // 'second' are the delimiters following that word. 101 static void SplitStringDelims( 102 StringRef Source, 103 SmallVectorImpl<std::pair<StringRef, StringRef>> &OutFragments, 104 function_ref<bool(char)> IsLegalChar) { 105 // The beginning of the input string. 106 const auto Head = Source.begin(); 107 108 // Obtain any leading delimiters. 109 auto Start = std::find_if(Head, Source.end(), IsLegalChar); 110 if (Start != Head) 111 OutFragments.push_back({"", Source.slice(0, Start - Head)}); 112 113 // Capture each word and the delimiters following that word. 114 while (Start != Source.end()) { 115 Start = std::find_if(Start, Source.end(), IsLegalChar); 116 auto End = std::find_if_not(Start, Source.end(), IsLegalChar); 117 auto DEnd = std::find_if(End, Source.end(), IsLegalChar); 118 OutFragments.push_back({Source.slice(Start - Head, End - Head), 119 Source.slice(End - Head, DEnd - Head)}); 120 Start = DEnd; 121 } 122 } 123 124 // This returns true if 'C' is a character that can show up in an 125 // Itanium-mangled string. 126 static bool IsLegalItaniumChar(char C) { 127 // Itanium CXX ABI [External Names]p5.1.1: 128 // '$' and '.' in mangled names are reserved for private implementations. 129 return isAlnum(C) || C == '.' || C == '$' || C == '_'; 130 } 131 132 // If 'Split' is true, then 'Mangled' is broken into individual words and each 133 // word is demangled. Otherwise, the entire string is treated as a single 134 // mangled item. The result is output to 'OS'. 135 static void demangleLine(llvm::raw_ostream &OS, StringRef Mangled, bool Split) { 136 std::string Result; 137 if (Split) { 138 SmallVector<std::pair<StringRef, StringRef>, 16> Words; 139 SplitStringDelims(Mangled, Words, IsLegalItaniumChar); 140 for (const auto &Word : Words) 141 Result += ::demangle(std::string(Word.first)) + Word.second.str(); 142 } else 143 Result = ::demangle(std::string(Mangled)); 144 OS << Result << '\n'; 145 OS.flush(); 146 } 147 148 int llvm_cxxfilt_main(int argc, char **argv) { 149 InitLLVM X(argc, argv); 150 BumpPtrAllocator A; 151 StringSaver Saver(A); 152 CxxfiltOptTable Tbl; 153 ToolName = argv[0]; 154 opt::InputArgList Args = Tbl.parseArgs(argc, argv, OPT_UNKNOWN, Saver, 155 [&](StringRef Msg) { error(Msg); }); 156 if (Args.hasArg(OPT_help)) { 157 Tbl.printHelp(outs(), 158 (Twine(ToolName) + " [options] <mangled>").str().c_str(), 159 "LLVM symbol undecoration tool"); 160 // TODO Replace this with OptTable API once it adds extrahelp support. 161 outs() << "\nPass @FILE as argument to read options from FILE.\n"; 162 return 0; 163 } 164 if (Args.hasArg(OPT_version)) { 165 outs() << ToolName << '\n'; 166 cl::PrintVersionMessage(); 167 return 0; 168 } 169 170 // The default value depends on the default triple. Mach-O has symbols 171 // prefixed with "_", so strip by default. 172 if (opt::Arg *A = 173 Args.getLastArg(OPT_strip_underscore, OPT_no_strip_underscore)) 174 StripUnderscore = A->getOption().matches(OPT_strip_underscore); 175 else 176 StripUnderscore = Triple(sys::getProcessTriple()).isOSBinFormatMachO(); 177 178 Types = Args.hasArg(OPT_types); 179 180 std::vector<std::string> Decorated = Args.getAllArgValues(OPT_INPUT); 181 if (Decorated.empty()) 182 for (std::string Mangled; std::getline(std::cin, Mangled);) 183 demangleLine(llvm::outs(), Mangled, true); 184 else 185 for (const auto &Symbol : Decorated) 186 demangleLine(llvm::outs(), Symbol, false); 187 188 return EXIT_SUCCESS; 189 } 190