Graph theory

Single-entry single-exit

In mathematics graph theory, a single-entry single-exit (SESE) region in a given graph is an ordered edge pair. For example, with the ordered edge pair, (a, b) of distinct control-flow edges a and b where: 1. * a dominates b 2. * b postdominates a 3. * Every cycle containing a also contains b and vice versa. where a node x is said to dominate node y in a directed graph if every path from start to y includes x. A node x is said to postdominate a node y if every path from y to end includes x. So, a and b refer to the entry and exit edge, respectively. * The first condition ensures that every path from start into the region passes through the region’s entry edge, a. * The second condition ensures that every path from inside the region to end passes through the region’s exit edge, b. * The first two conditions are necessary but not enough to characterize SESE regions: since backedges do not alter the dominance or postdominance relationships, the first two conditions alone do not prohibit backedges entering or exiting the region. * The third condition encodes two constraints: every path from inside the region to a point 'above' a passed through b, and every path from a point 'below' b to a point inside the region passes through a. (Wikipedia).

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Related pages

Graph theory | Graph (discrete mathematics) | Mathematics | Control-flow graph | Directed graph