CODEWITHSUNDEEP
c++dictionarysegmentation-fault
Jepsson
Jepsson

Reputation: 35

Segmentation fault when using map

I get a segmentation fault when doing anything with my map. Its declared like this:

typedef std::map<uint16_t, std::vector<std::pair<std::string, uint16_t> > > bitMap_t;

And then I have a private class member using this map

        private:
        bitMap_t m_bitMap;

My code using this map looks like this

uint16_t i = 1;
uint16_t j = 0;
uint16_t reg = 0;
uint16_t regIndex = 0;
uint8_t regSizeWords = 0;

for (regIndex = 0; regIndex < NUMBER_OF_BIT_REGS; regIndex++) {
    for (i = 1, reg = m_regList[regIndex].address; reg < (m_regList[regIndex].address + REGS_SIZE); reg++, i++) {
        for (j = 0; j < m_regList[regIndex].signalsAndBitMasks.size(); j++) {
            ostringstream signalName;
            signalName << m_regList[regIndex].signalsAndBitMasks[j].first << "." << i;

            m_bitMap[reg].push_back(make_pair(signalName.str(), m_regList[regIndex].signalsAndBitMasks[j].second));
        }
    }
}

I have also tested just doing a m_bitMap.clear() before all this code and that didn't work either. So I guess it has something to do with nested map, vector and pair or? The segfault error looks like this:

std::less<unsigned short>::operator() at stl_function.h:230 0x805e8da
std::_Rb_tree<unsigned short, std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > >, std::_Select1st<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > >, std::less<unsigned short>, std::allocator<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > > >::_M_lower_bound() at stl_tree.h:986 0x8063a0f

std::_Rb_tree<unsigned short, std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > >, std::_Select1st<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > >, std::less<unsigned short>, std::allocator<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > > >::lower_bound() at stl_tree.h:745 0x8063531

std::map<unsigned short, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > >, std::less<unsigned short>, std::allocator<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > > >::lower_bound() at stl_map.h:701 0x806311a

std::map<unsigned short, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > >, std::less<unsigned short>, std::allocator<std::pair<unsigned short const, std::vector<std::pair<std::string, unsigned short>, std::allocator<std::pair<std::string, unsigned short> > > > > >::operator[]() at stl_map.h:447 0x8062bc1

srvmgr::MbBitMap::InitBitMap() at mbbitmap.cpp:175 0x80620cc

Upvotes: 0

Views: 3742

Answers (1)

MSalters
MSalters

Reputation: 179907

By far the most common reason is not actually having a map in the first place.

You write that the map is private: bitMap_t m_bitMap;, i.e. a member of an object. I'll bet that you have a pointer to this object (MbBitMap ?), but for some reason unrelated to std::map this pointer is invalid.

Upvotes: 1

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