Discussion
Match each data flow problem with its direction and meet operation.
List I
A. reaching definitions
B. live variables
C. available expressions
D. very busy expressions
List II
1. forward, intersection
2. forward, union
3. backward, intersection
4. backward, union
Answer: B
Direction says whether information flows with or against control, and the meet says whether a fact must hold on all paths or on some. Together they classify every classical problem. A new analysis is usually described by naming its place in the same scheme.
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