Peer Instruction #7: Memory Model/Stack Convention Why not discard the stack convention and just use register passing? A. B. C. D. E. Without stack, recursion is impossible No alternative memory models exist Overall, no better approach exists
Number of registers is too limited Register passing is too complicated Stack Convention CS 270, Spring Semester 2016 3 Which of the following is not stored on the stack? A. B. C.
D. E. Dynamic allocations Function parameters Return values Local variables Return addresses Stack Convention CS 270, Spring Semester 2016 4
Does the caller or callee have to push function parameters? A. Caller function B. Callee function C. Either, depending on the protocol Stack Convention CS 270, Spring Semester 2016 5 Does the caller or callee have to pop
the return value of a function? A. Caller function B. Callee function C. Either, depending on the protocol Stack Convention CS 270, Spring Semester 2016 6 Does the caller or callee have to allocate space for the return value? A. Caller function
B. Callee function C. Either, depending on the protocol Stack Convention CS 270, Spring Semester 2016 7 Why is it necessary to have both a frame pointer and stack pointer? A. Because the stack pointer is volatile, and constantly changes B. Because the stack pointer is shared
between all functions C. To have a stable pointer for accessing function parameters and locals D. All of the above Frame Pointer CS 270, Spring Semester 2016 8 What does the following LC-3 assembly code do? ADD R6,R6,#-1 STR R5,R6,#0
LDR R5,R6,#0 ADD R6,R6,#1 A. Initializes the frame and stack pointer B. Pushes and pops the frame pointer C. Pushes and pops the return address Frame Pointer CS 270, Spring Semester 2016 9
Course Levels. Level 2 courses are designed for students who read below grade level. Level 1 courses are college preparatory courses. Honors courses are rigorous, in-depth study through interpretation, application, analysis and synthesis of course concepts
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