Question

can I do something like:

typedef void (*functor)(void* param);

//machine code of function
char functionBody[] = {
    0xff,0x43,0xBC,0xC0,0xDE,....
}
//cast pointer to function
functor myFunc = (functor)functionBody;
//call to functor
myFunc(param);

Answer 1

Formally, the C language doesn’t allow conversions between function pointers and object pointers, so this can’t be done.

However, many C implementations – perhaps even “most” – support this as an extension. Whether it works or not depends on things like memory permissions and cache coherency, which will change depending on your architecture and operating system.