demangle函數實現

#include <cxxabi.h>
#include <cstdio>

void Exception::fillStackTrace()
{
  const int len = 200;
  void* buffer[len];
  int nptrs = ::backtrace(buffer, len);
  char** strings = ::backtrace_symbols(buffer, nptrs);
  if (strings)
  {
    for (int i = 0; i < nptrs; ++i)
    {
      // TODO demangle funcion name with abi::__cxa_demangle
      stack_.append(demangle(strings[i]));
      stack_.push_back('\n');
    }
    free(strings);
  }
}

string Exception::demangle(const char *symbol)
{
    size_t size = 0;
    int status = 0;
    char temp[128] = {0};
    char *demangled = NULL;
    //first, try to demangle a c++ name
    if (sscanf(symbol, "%*[^(]%*[^_]%127[^)+]", temp) == 1) {
        if ((demangled = abi::__cxa_demangle(temp, NULL, &size,
                        &status)) != NULL) {
            string result(demangled);
            free(demangled);
            return result;
        }
    }
    //if that didn't work, try to get a regular c symbol
    if (sscanf(symbol, "%127s", temp) == 1) {
        return temp;
    }
    //if all else fails, just return the symbol
    return symbol;
}

用g++編譯時候加上-rdynamic選項，加入函數符號表才能正確顯示