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c++stlvectorgdbicc

How do I examine the contents of an std::vector in gdb, using the icc compiler?

I want to examine the contents of a std::vector in gdb but I don't have access to _M_impl because I'm using icc, not gcc, how do I do it? Let's say it's a std::vector for the sake of simplicity.

There is a very nice answer here but this doesn't work if I use icc, the error message is "There is no member or method named _M_impl". There appears to be a nice debug toolset here but it also relies on _M_impl.

Solution

  • Not sure this will work with your vector, but it worked for me.

    #include <string>
#include <vector>

int main() {
    std::vector<std::string> vec;
    vec.push_back("Hello");
    vec.push_back("world");
    vec.push_back("!");
    return 0;
}

    gdb:

    (gdb) break source.cpp:8
(gdb) run
(gdb) p vec.begin()
$1 = {
   _M_current = 0x300340
}
(gdb) p $1._M_current->c_str()
$2 = 0x3002fc "Hello"
(gdb) p $1._M_current +1
$3 = (string *) 0x300344
(gdb) p $3->c_str()
$4 = 0x30032c "world"