tools/llvm-cxxfilt/llvm-cxxfilt.cpp

   1 //===-- llvm-c++filt.cpp --------------------------------------------------===//
   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 #include "llvm/Demangle/Demangle.h"
  11 #include "llvm/Support/CommandLine.h"
  12 #include "llvm/Support/InitLLVM.h"
  13 #include "llvm/Support/raw_ostream.h"
  14 #include <cstdlib>
  15 #include <iostream>
  16
  17 using namespace llvm;
  18
  19 enum Style {
  20   Auto,  ///< auto-detect mangling
  21   GNU,   ///< GNU
  22   Lucid, ///< Lucid compiler (lcc)
  23   ARM,
  24   HP,    ///< HP compiler (xCC)
  25   EDG,   ///< EDG compiler
  26   GNUv3, ///< GNU C++ v3 ABI
  27   Java,  ///< Java (gcj)
  28   GNAT   ///< ADA copiler (gnat)
  29 };
  30 static cl::opt<Style>
  31     Format("format", cl::desc("decoration style"),
  32            cl::values(clEnumValN(Auto, "auto", "auto-detect style"),
  33                       clEnumValN(GNU, "gnu", "GNU (itanium) style")),
  34            cl::init(Auto));
  35 static cl::alias FormatShort("s", cl::desc("alias for --format"),
  36                              cl::aliasopt(Format));
  37
  38 static cl::opt<bool> StripUnderscore("strip-underscore",
  39                                      cl::desc("strip the leading underscore"),
  40                                      cl::init(false));
  41 static cl::alias StripUnderscoreShort("_",
  42                                       cl::desc("alias for --strip-underscore"),
  43                                       cl::aliasopt(StripUnderscore));
  44
  45 static cl::opt<bool>
  46     Types("types",
  47           cl::desc("attempt to demangle types as well as function names"),
  48           cl::init(false));
  49 static cl::alias TypesShort("t", cl::desc("alias for --types"),
  50                             cl::aliasopt(Types));
  51
  52 static cl::list<std::string>
  53 Decorated(cl::Positional, cl::desc("<mangled>"), cl::ZeroOrMore);
  54
  55 static void demangle(llvm::raw_ostream &OS, const std::string &Mangled) {
  56   int Status;
  57
  58   const char *Decorated = Mangled.c_str();
  59   if (StripUnderscore)
  60     if (Decorated[0] == '_')
  61       ++Decorated;
  62   size_t DecoratedLength = strlen(Decorated);
  63
  64   char *Undecorated = nullptr;
  65
  66   if (Types || ((DecoratedLength >= 2 && strncmp(Decorated, "_Z", 2) == 0) ||
  67                 (DecoratedLength >= 4 && strncmp(Decorated, "___Z", 4) == 0)))
  68     Undecorated = itaniumDemangle(Decorated, nullptr, nullptr, &Status);
  69
  70   if (!Undecorated &&
  71       (DecoratedLength > 6 && strncmp(Decorated, "__imp_", 6) == 0)) {
  72     OS << "import thunk for ";
  73     Undecorated = itaniumDemangle(Decorated + 6, nullptr, nullptr, &Status);
  74   }
  75
  76   OS << (Undecorated ? Undecorated : Mangled) << '\n';
  77   OS.flush();
  78
  79   free(Undecorated);
  80 }
  81
  82 int main(int argc, char **argv) {
  83   InitLLVM X(argc, argv);
  84
  85   cl::ParseCommandLineOptions(argc, argv, "llvm symbol undecoration tool\n");
  86
  87   if (Decorated.empty())
  88     for (std::string Mangled; std::getline(std::cin, Mangled);)
  89       demangle(llvm::outs(), Mangled);
  90   else
  91     for (const auto &Symbol : Decorated)
  92       demangle(llvm::outs(), Symbol);
  93
  94   return EXIT_SUCCESS;
  95 }