Incrementing function pointers

Question

I just learned about function pointers (pointers pointing at the adress where where the machine code of a function is stored). This made me think about machine code and how

Answer 1

1. Machine code can be stored non-consecutively. Compiler feels free to split or merge some functions (in optimisation)
2. If you manually increase a pointer to function you will probably get into middle of function, which is wrong.
3. Debugging routines are already available: you can obtain stack traces of current execution point and resolve function names where execution pointers in stack do belongs (man backtrace, man backtrace_symbols). With addr2line you can convert them to line numbers.