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Reasoning About the Unknown in Static Analysis

By Isil Dillig, Thomas Dillig, Alex Aiken
Communications of the ACM, August 2010, Vol. 53 No. 8, Pages 115-123
10.1145/1787234.1787259
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'Unknown' by Andy Cunningham — "Unknown" by Andy Cunningham

Credit: Andy Cunningham

Static program analysis techniques cannot know certain values, such as the value of user input or network state, at analysis time. While such unknown values need to be treated as nondeterministic choices made by the program's execution environment, it is still possible to glean very useful information about how such statically unknown values may or must influence computation.

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