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llvm-cxxfilt.cpp
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Editing: llvm-cxxfilt.cpp
//===-- llvm-c++filt.cpp --------------------------------------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #include "llvm/ADT/StringExtras.h" #include "llvm/ADT/Triple.h" #include "llvm/Demangle/Demangle.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/Host.h" #include "llvm/Support/InitLLVM.h" #include "llvm/Support/raw_ostream.h" #include <cstdlib> #include <iostream> using namespace llvm; enum Style { Auto, ///< auto-detect mangling GNU, ///< GNU Lucid, ///< Lucid compiler (lcc) ARM, HP, ///< HP compiler (xCC) EDG, ///< EDG compiler GNUv3, ///< GNU C++ v3 ABI Java, ///< Java (gcj) GNAT ///< ADA compiler (gnat) }; static cl::opt<Style> Format("format", cl::desc("decoration style"), cl::values(clEnumValN(Auto, "auto", "auto-detect style"), clEnumValN(GNU, "gnu", "GNU (itanium) style")), cl::init(Auto)); static cl::alias FormatShort("s", cl::desc("alias for --format"), cl::aliasopt(Format)); static cl::opt<bool> StripUnderscore("strip-underscore", cl::desc("strip the leading underscore"), cl::init(false)); static cl::alias StripUnderscoreShort("_", cl::desc("alias for --strip-underscore"), cl::aliasopt(StripUnderscore)); static cl::opt<bool> NoStripUnderscore("no-strip-underscore", cl::desc("do not strip the leading underscore"), cl::init(false)); static cl::alias NoStripUnderscoreShort("n", cl::desc("alias for --no-strip-underscore"), cl::aliasopt(NoStripUnderscore)); static cl::opt<bool> Types("types", cl::desc("attempt to demangle types as well as function names"), cl::init(false)); static cl::alias TypesShort("t", cl::desc("alias for --types"), cl::aliasopt(Types)); static cl::list<std::string> Decorated(cl::Positional, cl::desc("<mangled>"), cl::ZeroOrMore); static cl::extrahelp HelpResponse("\nPass @FILE as argument to read options from FILE.\n"); static bool shouldStripUnderscore() { if (StripUnderscore) return true; if (NoStripUnderscore) return false; // If none of them are set, use the default value for platform. // macho has symbols prefix with "_" so strip by default. return Triple(sys::getProcessTriple()).isOSBinFormatMachO(); } static std::string demangle(const std::string &Mangled) { int Status; std::string Prefix; const char *DecoratedStr = Mangled.c_str(); if (shouldStripUnderscore()) if (DecoratedStr[0] == '_') ++DecoratedStr; size_t DecoratedLength = strlen(DecoratedStr); char *Undecorated = nullptr; if (Types || ((DecoratedLength >= 2 && strncmp(DecoratedStr, "_Z", 2) == 0) || (DecoratedLength >= 4 && strncmp(DecoratedStr, "___Z", 4) == 0))) Undecorated = itaniumDemangle(DecoratedStr, nullptr, nullptr, &Status); if (!Undecorated && (DecoratedLength > 6 && strncmp(DecoratedStr, "__imp_", 6) == 0)) { Prefix = "import thunk for "; Undecorated = itaniumDemangle(DecoratedStr + 6, nullptr, nullptr, &Status); } std::string Result(Undecorated ? Prefix + Undecorated : Mangled); free(Undecorated); return Result; } // Split 'Source' on any character that fails to pass 'IsLegalChar'. The // returned vector consists of pairs where 'first' is the delimited word, and // 'second' are the delimiters following that word. static void SplitStringDelims( StringRef Source, SmallVectorImpl<std::pair<StringRef, StringRef>> &OutFragments, function_ref<bool(char)> IsLegalChar) { // The beginning of the input string. const auto Head = Source.begin(); // Obtain any leading delimiters. auto Start = std::find_if(Head, Source.end(), IsLegalChar); if (Start != Head) OutFragments.push_back({"", Source.slice(0, Start - Head)}); // Capture each word and the delimiters following that word. while (Start != Source.end()) { Start = std::find_if(Start, Source.end(), IsLegalChar); auto End = std::find_if_not(Start, Source.end(), IsLegalChar); auto DEnd = std::find_if(End, Source.end(), IsLegalChar); OutFragments.push_back({Source.slice(Start - Head, End - Head), Source.slice(End - Head, DEnd - Head)}); Start = DEnd; } } // This returns true if 'C' is a character that can show up in an // Itanium-mangled string. static bool IsLegalItaniumChar(char C) { // Itanium CXX ABI [External Names]p5.1.1: // '$' and '.' in mangled names are reserved for private implementations. return isalnum(C) || C == '.' || C == '$' || C == '_'; } // If 'Split' is true, then 'Mangled' is broken into individual words and each // word is demangled. Otherwise, the entire string is treated as a single // mangled item. The result is output to 'OS'. static void demangleLine(llvm::raw_ostream &OS, StringRef Mangled, bool Split) { std::string Result; if (Split) { SmallVector<std::pair<StringRef, StringRef>, 16> Words; SplitStringDelims(Mangled, Words, IsLegalItaniumChar); for (const auto &Word : Words) Result += ::demangle(std::string(Word.first)) + Word.second.str(); } else Result = ::demangle(std::string(Mangled)); OS << Result << '\n'; OS.flush(); } int main(int argc, char **argv) { InitLLVM X(argc, argv); cl::ParseCommandLineOptions(argc, argv, "llvm symbol undecoration tool\n"); if (Decorated.empty()) for (std::string Mangled; std::getline(std::cin, Mangled);) demangleLine(llvm::outs(), Mangled, true); else for (const auto &Symbol : Decorated) demangleLine(llvm::outs(), Symbol, false); return EXIT_SUCCESS; }
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