TCMalloc memory leak debugging - c++

Question

I've compiled an application with tcmalloc and used HEAPPROFILE environment variable to get heap files
every 10MB or so a new heap file is created and according to the tcmalloc page i can use the pprof tool to compare heap files, and see what are the additional non released objects (possible leak).
pprof --text myapp --base=myapp.0001.heap myapp.0047.heap
the result is:
...
Total: 4600.7 MB
4592.3 99.8% 99.8% 4592.3 99.8% 0x00000000009f1d25
7.3 0.2% 100.0% 7.3 0.2% 0x00000000009f1cfc
1.0 0.0% 100.0% 1.0 0.0% 0x00000000009f74f1
0.0 0.0% 100.0% 4600.7 100.0% 00007f07fe149b44
0.0 0.0% 100.0% 4600.7 100.0% 0x0000000000480da1
0.0 0.0% 100.0% 4600.7 100.0% 0x00000000004b5a3e
0x00000000009f1d25 is a nice address, but i can't really do anything with this data.
I've tried running the same in an helloworld application
pprof --text helloworld helloworld.0001.heap
Using local file helloworld.
Using local file helloworld.0001.heap.
Total: 9.5 MB
9.5 100.0% 100.0% 9.5 100.0% BigNumber::BigNumber
0.0 0.0% 100.0% 0.0 0.0% __GI__IO_file_doallocate
0.0 0.0% 100.0% 9.5 100.0% main
0.0 0.0% 100.0% 0.0 0.0% _IO_new_file_overflow
0.0 0.0% 100.0% 0.0 0.0% _IO_new_file_xsputn
0.0 0.0% 100.0% 0.0 0.0% __GI__IO_doallocbuf
0.0 0.0% 100.0% 0.0 0.0% __GI__IO_fwrite
0.0 0.0% 100.0% 9.5 100.0% __libc_start_main
0.0 0.0% 100.0% 9.5 100.0% _start
0.0 0.0% 100.0% 0.0 0.0% std::__ostream_insert
0.0 0.0% 100.0% 0.0 0.0% std::operator<<
Here we can see clearly that all the functions have clear names, and the leak is from the BigNumber constructor.
Can anyone point me in the right direction toward getting the meaning of the address above ?