Apart from Dll concept that provides ability of loading/unloading methods or functions at run-time, I’m wondering if a compiler may ever say something like, ok as this particular part of the code takes considerable amount of space in code segment and is never gonna be used again after this point during program execution, it’d be good to generate some code to unload that part of code segment after reaching that particular point during program execution so that overall space took by code segment gets smaller. Is it something just fictional or may that happen?
Apart from Dll concept that provides ability of loading/unloading methods or functions at run-time,
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A compiler can do anything it wants to, as long as that doesn’t violate the standard. If it can figure out that the code is never called again, it can ditch it completely.
It could even replace it with a smaller stub function that would reload the code, were it required.
But you’ll be very unlikely to ever see that in a modern OS since the OS itself provides that capability under the covers.
Operating systems (at least the common ones) will swap out your physical pages when memory runs low, and they won’t be reloaded until they’re needed (usually by a page fault when trying to access them).