Print the name of the calling function to the debug log

Try this:

#include <execinfo.h>

void *addr[2];
int nframes = backtrace(addr, sizeof(addr)/sizeof(*addr));
if (nframes > 1) {
    char **syms = backtrace_symbols(addr, nframes);
    NSLog(@"%s: caller: %s", __func__, syms[1]);
    free(syms);
} else {
    NSLog(@"%s: *** Failed to generate backtrace.", __func__);
}