exam2-rubric

exam2-rubric - ECE 468 Midterm 2 November 4, 2010 Name: _...

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ECE 468 — Midterm 2 November 4, 2010 Name: ______________________________________ Purdue email: ______________________________________ Please sign the following: I afFrm that the answers given on this test are mine and mine alone. I did not receive help from any person or material (other than those explicitly allowed). X ___________________________________________ Part Points Score 1 30 2 20 3 15 4 35 Total 100
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Part 1: Semantic actions and functions (30 pts) 1) Explain when pass-by-value will produce the same results as pass-by- reference (2 pts): No partial credit. Note: a few people brought up passing arrays. The key with arrays is that they are always passed by reference in C/C++, not that pass-by-reference and pass-by-value do the same thing. You could design a language that could pass arrays by value (i.e., by copying them into the arguments), in which case pass-by-value would differ from pass- by-reference. 2) a) Give one reason that caller-saves is better than callee-saves (2 points). b) Give one reason that callee-saves is better than caller-saves (2 points). No partial credit 3) Draw the AST that would be generated for the expression x := y + z * w and for each AST node, show the data object that would be generated. For each data object, show the code that would be generated (if any), the temporary the result will be stored in, and whether the temporary is an R-value or an L-value. (14 pts) 7 AST nodes, 1 point per node, 1 point per piece of code. Don ʼ t forget to add in the AST nodes for “x :=”! Note that a lot of people loaded from variables immediately upon seeing them (as
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exam2-rubric - ECE 468 Midterm 2 November 4, 2010 Name: _...

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