List the du-paths for the totalTruffles variable, and indicate which are definition clear. How do these du-paths align with the slices on totalTruffles?
List the du-paths for the totalTruffles variable, and indicate which are definition clear. How do these du-paths align with the slices on totalTruffles?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
List the du-paths for the totalTruffles variable, and indicate which are definition
clear. How do these du-paths align with the slices on totalTruffles?
Expert Solution
Step 1
A du-path is a simple path where the initial node of the path is. the only defining node of x in the path.
Reach: if there is a def-clear path from the nodes m to p with. respect to x, then the def of x at m reaches the use at p
A definition-clear du-path represents a small function that can be tested by itself. If a du-path is not definition-clear, it should be tested for each defining node. Starting point is a program, P, with program graph G(P), and the set V of variables in program P.
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