How does the ref keyword work (in terms of memory)

Question

C# has a ref keyword. Using ref you can pass an int to a method by reference. What goes on the stack frame when you call a method that accepts an int by reference?

Answer 1

The address of the local variable or field. In the IL, ldloca.s instruction is used for a local variable.

Loads the address of the local variable at a specific index onto the evaluation stack

The stind instruction is used to store the value back in the variable

Store value of type (...) into memory at address

The address is 32/64 bit, depending on target architecture.