485 research outputs found
La dolce Vita. Il Museo del Diabete. Università di Torino. Palazzo del rettorato. Via Verdi 8. 23 aprile-22 giugno 2019. Fondazione Diabete Torino.
Software Model Checking via Large-Block Encoding
The construction and analysis of an abstract reachability tree (ART) are the
basis for a successful method for software verification. The ART represents
unwindings of the control-flow graph of the program. Traditionally, a
transition of the ART represents a single block of the program, and therefore,
we call this approach single-block encoding (SBE). SBE may result in a huge
number of program paths to be explored, which constitutes a fundamental source
of inefficiency. We propose a generalization of the approach, in which
transitions of the ART represent larger portions of the program; we call this
approach large-block encoding (LBE). LBE may reduce the number of paths to be
explored up to exponentially. Within this framework, we also investigate
symbolic representations: for representing abstract states, in addition to
conjunctions as used in SBE, we investigate the use of arbitrary Boolean
formulas; for computing abstract-successor states, in addition to Cartesian
predicate abstraction as used in SBE, we investigate the use of Boolean
predicate abstraction. The new encoding leverages the efficiency of
state-of-the-art SMT solvers, which can symbolically compute abstract
large-block successors. Our experiments on benchmark C programs show that the
large-block encoding outperforms the single-block encoding.Comment: 13 pages (11 without cover), 4 figures, 5 table
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