POPL 2017
Sun 15 - Sat 21 January 2017
Wed 18 Jan 2017 11:20 - 11:45 at Amphitheater 44 - Abstract Interpretation Chair(s): Isabella Mastroeni

To infer complex structural invariants, shape analyses rely on expressive families of logical properties. Many such analyses manipulate abstract memory states that consist of separating conjunctions of basic predicates describing atomic blocks or summaries. Moreover, they use finite disjunctions of abstract memory states in order to account for dissimilar shapes. Disjunctions should be kept small for the sake of scalability, though precision often requires to keep additional case splits. In this context, deciding when and how to merge case splits and to replace them with summaries is critical both for the precision and for the efficiency. Existing techniques use sets of syntactic rules, which are tedious to design and prone to failure. In this paper, we design a semantic criterion to clump abstract states based on their silhouette which applies not only to the conservative union of disjuncts, but also to the weakening of separating conjunction of memory predicates into inductive summaries. Our approach allows to define union and widening operators that aim at preserving the case splits that are required for the analysis to succeed. We implement this approach in the MemCAD analyzer, and evaluate it on real-world C codes from existing libraries, including programs dealing with doubly linked lists, red-black trees and AVL-trees.

Wed 18 Jan

POPL-2017-papers
10:30 - 12:10: POPL - Abstract Interpretation at Amphitheater 44
Chair(s): Isabella MastroeniUniversity of Verona, Italy
POPL-2017-papers10:30 - 10:55
Talk
Jade AlglaveUniversity College London, Patrick CousotNew York University
POPL-2017-papers10:55 - 11:20
Talk
Kimball GermaneUniversity of Utah, Matthew MightUniversity of Utah; Harvard Medical School; The White House
POPL-2017-papers11:20 - 11:45
Talk
Huisong LiINRIA/CNRS/ENS/PSL*, François BérengerINRIA/CNRS/ENS/PSL*, Bor-Yuh Evan ChangUniversity of Colorado Boulder, Xavier RivalINRIA/CNRS/ENS Paris
POPL-2017-papers11:45 - 12:10
Talk
Gagandeep SinghETH Zurich, Switzerland, Markus PüschelETH Zurich, Martin VechevETH Zurich