Find size of a function in C

Question

I am learning function pointers,I understand that we can point to functions using function pointers.Then I assume that they stay in memory.Do they stay in stack or heap?Can

Answer 1

To make it simple, functions usually don't go into the stack or the heap because they are meant to be read-only data, whereas stack and heap are read-write memories.

Do you really need to know its size at runtime? If no, you can get it by a simple objdump -t -i .text a.out where a.out is the name of your binary. The .text is where the linker puts the code, and the loader could choose to make this memory read-only (or even just execute-only). If yes, as it has been replied in previous posts, there are ways to do it, but it's tricky and non-portable... Clifford gave the most straightforward solution, but the linker rarely puts function in such a sequential manner into the final binary. Another solution is to define sections in your linker script with pragmas, and reserve a storage for a global variable which will be filled by the linker with the SIZEOF(...) section containing your function. It's linker dependent and not all linkers provide this function.