Inspecting standard container (std::map) contents with gdb


Question

Supposing to have something like this:

#include <map>
int main(){
    std::map<int,int> m;
    m[1] = 2;
    m[2] = 4;
    return 0;
}

I would like to be able to inspect the contents of the map running the program from gdb.
If I try using the subscript operator I get:

(gdb) p m[1]
Attempt to take address of value not located in memory.

Using the find method does not yield better results:

(gdb) p m.find(1)
Cannot evaluate function -- may be inlined

Is there a way to accomplish this?

1
82
1/12/2009 9:21:25 AM

Accepted Answer

I think there isn't, at least not if your source is optimized etc. However, there are some macros for gdb that can inspect STL containers for you:

http://sourceware.org/ml/gdb/2008-02/msg00064.html

However, I don't use this, so YMMV

32
1/9/2009 10:31:00 AM

The existing answers to this question are very out of date. With a recent GCC and GDB it Just WorksTM thanks to the built-in Python support in GDB 7.x and the libstdc++ pretty printers that come with GCC.

For the OP's example I get:

(gdb) print m
$1 = std::map with 2 elements = {[1] = 2, [2] = 4}

If it doesn't work automatically for you see the first bullet point on the STL Support page of the GDB wiki.

You can write Python pretty printers for your own types too, see Pretty Printing in the GDB manual.


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