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An incremental version of iterative data flow analysis

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2 Author(s)
Pollock, L.L. ; Dept. of Comput. Sci., Rice Univ., Houston, TX, USA ; Soffa, M.L.

A technique is presented for incrementally updating solutions to both union and intersection data-flow problems in response to program edits and transformations. For generality, the technique is based on the iterative approach to computing data-flow information. The authors show that for both union and intersection problems, some changes can be incrementally incorporated immediately into the data-flow sets while others are handled by a two-phase approach. The first phase updates the data-flow sets to overestimate the effect of the program change, enabling the second phase to incrementally update the affected data-flow sets to reflect the actual program change. An important problem that is addressed is the computation of the data-flow changes that need to be propagated throughout a program, based on different local code changes. The technique is compared to other approaches to incremental data-flow analysis

Published in:

Software Engineering, IEEE Transactions on  (Volume:15 ,  Issue: 12 )