C++ on final    - no
vtables - how they work
    class with virtual functions begin with a pointer to a vtable
    vtable stract/array of function pointers
writing asm on final    - good idea!
struct ptr, memcpy something else to that struct; cast? -- not needed (void *)
OH next week - probably


do you need to know which register to save
    no (ish; do know rax rsp)
    but if I tell you which ones are what, you should be able to do it
if you don't initialize, what's the default?
    undefined
examples of memory errors - see http://www.cs.virginia.edu/luther/COA1/F2019/memory.html
is adjacent memory faster than scattered memory?    -    Yes
    should I write my own malloc?   - probably not
    profile - optimize the slow bits

practice Q2 - overflow? unitialized?
do I have to use %rbp in the C calling convention
    no
    if you optimize -O2 or more, it will usually not be used
How does malloc work
    uses an OS call to get memory
    has a DS to store used and unused bytes
        address of the next never-used byte
        free list
        block size for every allocated block

which C functions to know?
    printf
    puts
    malloc
    read
    write


stderr
    0   input
    1   output  normal output
    2   output  error
how should I study?
    in a group
    early

    study beyond


Coming courses
    Spring: COA2 + 2102
    Fall (guess): 4810 + 2102

What logic gates will we make
    small enought to fit on a page
    not be one you already did