SUMMARYProgram slicing is a useful technique for debugging, testing and program integration. Intuitively, by the slice of a program P is meant, for a point n and a variablev in P, the set of statements and expressions in P that affect the value of v at n. To determine a slice, there must be a precise analysis of the dependencies among the statements in the program. It is difficult, on the other hand, to analyze the program containing recursions. This paper presents a static analysis for the dependencies in the program containing recursion, as well as the algorithm to determine the slice based on the result of the analysis. To cope with the recursive definition of the procedure, the proposed algorithm assumes the interprocedure information needed in the computation. This information is modified to the correct direction, and the process is iterated until the result converges.The program dependence graph is extended to hold the interprocedure information. Compared to the conventional algorithm, the proposed algorithm can analyze efficiently the program containing recursions, and can be used in the system to provide interactively the slice information.
Reducing the effort or cost of testing is a key issue to high productivity in software development. This paper proposes a test process model which aims to grasp the current status of test processes and to provide several metrics to evaluate efficiency of test processes in order to construct the process improvement plan. The model defines test process as an iterated process of four kinds of hypotheses development and verification which deal with: correctness of the program to be tested, location of failure, location of faults, and correction of the faults, respectively. The analysis results of experimental data collected from the test process show the validity of the proposed model and usefulness of the metrics.
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