I have a .ini file contains below data
[SYSTEM]
num_of_vps = 1
And I have this code to read an element in .ini file. (uint defined as typedef unsigned int uint)
boost::property_tree::ptree pt;
boost::property_tree::ini_parser::read_ini(iniFilePath, pt);
hwCount = pt.get<uint>("SYSTEM.num_of_vps");
I created a from files including above code and called it in a wrapper function in main.cc file. Then I am getting below error
terminate called after throwing an instance of 'boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >' what(): conversion of data to type "j" failed stack trace
#12 0x00002aaab613fcd5 in abort () from /lib64/libc.so.6
#13 0x00002aaab9b29315 in __gnu_cxx::__verbose_terminate_handler () at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/vterminate.cc:95
#14 0x00002aaab9a9e8f6 in __cxxabiv1::__terminate (handler=<optimized out>) at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
#15 0x00002aaab9a9e941 in std::terminate () at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
#16 0x00002aaab9a9ea74 in __cxxabiv1::__cxa_throw (obj=<optimized out>, tinfo=0x2aaab9e1ff60 <typeinfo for boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >>, dest=0x2aaab99bef18 <boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >::~clone_impl()>) at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_throw.cc:93
#17 0x00002aaab99bec82 in boost_1_68_0::throw_exception<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> > (e=...) at throw_exception.hpp:72
#18 0x00002aaab99be576 in boost_1_68_0::exception_detail::throw_exception_<boost_1_68_0::property_tree::ptree_bad_data> (x=..., current_function=0x2aaab9b45fc0 <boost_1_68_0::enable_if<boost_1_68_0::property_tree::detail::is_translator<boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> >, unsigned int>::type boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int, boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> >(boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int>) const::__PRETTY_FUNCTION__> "typename boost_1_68_0::enable_if<boost_1_68_0::property_tree::detail::is_translator<Translator>, Type>::type boost_1_68_0::property_tree::basic_ptree<Key, Data, KeyCompare>::get_value(T"..., file=0x2aaab9b45830 "property_tree/detail/ptree_implementation.hpp", line=675) at throw_exception.hpp:89
#19 0x00002aaab99be01e in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int, boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> > (this=0xbc86c8, tr=...) at property_tree/detail/ptree_implementation.hpp:673
#20 0x00002aaab99bd6a5 in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int> (this=0xbc86c8) at property_tree/detail/ptree_implementation.hpp:683
#21 0x00002aaab99bc545 in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get<unsigned int> (this=0x7fffffff9470, path=...) at property_tree/detail/ptree_implementation.hpp:754
#22 0x00002aaab99bba83 in MyRT::DUTConfigFile::readIniFile (this=0xbc5d50, iniFilePath=...) at DUTConfigFile.cpp:231
#23 0x00002aaab99ba8d2 in MyRT::DUTConfigFile::DUTConfigFile (this=0xbc5d50, iniFilePath=..., configFilePath=...) at DUTConfigFile.cpp:26
#24 0x00002aaab99c0839 in setupMyConfigs () at SimXLInterface.cpp:83
#31 0x0000000000408847 in main ()
I tried gdb and it is throwing an exception when converting string to uint using istringstream. Below are the two types of the transition
template<class K, class D, class C>
template<class Type> inline
Type basic_ptree<K, D, C>::get_value() const
{
return get_value<Type>(
typename translator_between<data_type, Type>::type());
}
(gdb) p typeid(Type).name()
$2 = 0x2aaab5c33c91 <typeinfo name for unsigned int> "j"
(gdb) p typeid(data_type).name()
could not find typeinfo symbol for 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
Below function in basic_ios.h throws a __throw_bad_cast() exception (here this->_M_num_get = NULL)
const __num_get_type& __ng = __check_facet(this->_M_num_get);
Internal build automation Makefile is addding -D_GLIBCXX_USE_CXX11_ABI=0 to object file creation by default
g++ -I/usr/myboost/boost/boost -Wall -std=c++14 -fopenmp -m64 -msse2 -fPIC \
-D_GLIBCXX_USE_CXX11_ABI=0 -g -o *.o -fPIC -c *.cpp
.so building command
g++ -m64 -msse2 -pthread -shared -static-libstdc++ -static-libgcc \
-Wl,-znoexecstack -g -o runtime.so *.o -ldl -lrt -lz -fopenmp -lcrypto
If I change it to read a std::string type and later convert it to uint, it is working without an exception
std::string strHwCount = pt.get<std::string>("SYSTEM.num_of_vps");
hwCount = static_cast<uint>(std::stoul(strHwCount));
I am using boost-1.68 and gcc-7.3. Dose this have to do with the ABI macro that I'm using? Is there a way to resolve this without above workaround
First of all I am migrating project from cmake to a internal custom build automation (some enhanced version of Makefile). In cmake this worked fine. Based on sehe's answer I did some further analysis. In a small standalone example this error is not reproducible (using both local string and actual .ini file read).
When going through gdb, In file boost/property_tree/stream_translator.hpp, I could find the read value from the file (changed to num_of_vps = 4 in file) in the both string and istringstream.
optional<Type> basic_ptree<K, D, C>
::get_value_optional(Translator tr) const
{
return tr.get_value(data());
}
(gdb) p data()
$1 = "4"
boost_1_68_0::optional<E> get_value(const internal_type &v) {
std::basic_istringstream<Ch, Traits, Alloc> iss(v);
iss.imbue(m_loc);
E e;
customized::extract(iss, e);
....
}
(gdb) p v
$1 = "4"
(gdb) p iss.str()
$2 = "4"
Inside above customized::extract(iss, e) function there is a string to unsigned int conversion using a basic_istream
static void extract(std::basic_istream<Ch, Traits>& s, E& e) {
s >> e;
if(!s.eof()) { s >> std::ws; }
}
Inside this >> operator there is a _M_extract function and inside that __check_facet function throws the exception (by cheking NULL of this->_M_num_get )
basic_istream<_CharT, _Traits>::
_M_extract(_ValueT& __v) {
__try {
const __num_get_type& __ng = __check_facet(this->_M_num_get);
...
inline const _Facet&
__check_facet(const _Facet* __f) {
if (!__f)
__throw_bad_cast();
return *__f;
}
stack trace above scenario
#0 std::istream::_M_extract<unsigned int>(unsigned int&) (__f=0x0) at gcc-7.3.0/objdir/x86_64-centos-linux/libstdc++-v3/include/bits/basic_ios.h:49
#1 std::istream::operator>>(unsigned int&) (this=0x7fffffff9980, __n=@0x7fffffff997c: 0)
#2 boost_1_68_0::property_tree::customize_stream::extract(std::istream&, unsigned int&) (s=..., e=@0x7fffffff997c: 0)
#3 boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int>::get_value(std::string const&) (this=0x7fffffff9b58, v="4")
I could see the same behavior in the another place that we are using std::stringstream . Variable ss shows empty even with << operator adding strings
std::stringstream ss;
ss << std::setw(8) << std::setfill('0') << std::hex << firmId;
I had a concern about that the ABI flag causing this, but I was able to remove it and the issue is still there. I searched about this kind of istream issues but couldn't find anything useful.
With a tweak to the gcc command I was able to run the executable with the .so with all sstream usages. Previously the gcc linking command was
g++ -m64 -msse2 -pthread -shared -static-libstdc++ -static-libgcc \
-Wl,-znoexecstack -g -o runtime.so *.o -ldl -lrt -lz -fopenmp -lcrypto
Removing -static-libstdc++ and dynamically linking libstdc++.so worked
g++ -m64 -msse2 -pthread -shared -static-libgcc -Wl,-znoexecstack -o runtime.so *.o \
-fPIC -ldl -lrt -lz -fopenmp -lcrypto -Wl,-rpath,/depot/gcc-7.3.0/lib64