an:06988656
Zbl 1451.68174
Duck, Gregory J.; Jaffar, Joxan; Yap, Roland H. C.
Shape neutral analysis of graph-based data-structures
EN
Theory Pract. Log. Program. 18, No. 3-4, 470-483 (2018).
00423704
2018
j
68Q60 68N17 68P05
constraint handling rules; satisfiability modulo constraint handling rules; satisfiability modulo theories; program analysis; data structures; memory errors
Summary: Malformed data-structures can lead to runtime errors such as arbitrary memory access or corruption. Despite this, reasoning over data-structure properties for low-level heap manipulating programs remains challenging. In this paper we present a constraint-based program analysis that checks data-structure integrity, w.r.t. given target data-structure properties, as the heap is manipulated by the program. Our approach is to automatically generate a solver for properties using the type definitions from the target program. The generated solver is implemented using a Constraint Handling Rules (CHR) extension of built-in heap, integer and equality solvers. A key property of our program analysis is that the target data-structure properties are \textit{shape neutral}, i.e., the analysis does not check for properties relating to a given data-structure graph \textit{shape}, such as doubly-linked-lists versus trees. Nevertheless, the analysis can detect errors in a wide range of data-structure manipulating programs, including those that use lists, trees, DAGs, graphs, etc. We present an implementation that uses the Satisfiability Modulo Constraint Handling Rules (SMCHR) system. Experimental results show that our approach works well for real-world C programs.