Does assembly code ignore const keyword?

Question

Does assembly code when used(linked) in a c project ignore const keyword declared before C datatypes and functions?? And can it modify the contents of the datatypes??

Answer 1

Does assembly code when used(linked) in a c project ignore const keyword declared before C datatypes and functions??

Yes, the const keyword is utterly ignored by assembly code.

And can it modify the contents of the datatypes??

If the compiler was able to place a const location in a read-only segment, then assembly code trying to modify it will cause a segmentation fault. Otherwise, unpredictable behavior will result, because the compiler may have optimized parts of the code, but not others, under the assumption that const locations were not modified.

Answer 2

And can it modify the contents of the datatypes??

Maybe, maybe not. If the original object was declared const then the compiler might emit it into a read-only data segment, which would be loaded into a read-only memory page at runtime. Writing to that page, even from assembly, would trigger a runtime exception (access violation or segmentation fault).

You won't receive a compile-time error, but at runtime your program might crash or behave erratically.