Understanding the stack pointer

The stack pointer points to the top of the stack memory, i.e., the first offset of the topmost stack frame in the stack memory. Its value can change from time to time, for example, when either a new function is called, or the current function call ends, leading to a new stack frame being created and pushed to the top of the stack or the topmost stack frame being removed, respectively.

Example

Let's examine the code example below to see what the stack pointer section of the stack frame will look like.