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- Xiaokang Qiu, Pranav Garg, Andrei Stefanescu, P. Madhusudan
- PLDI
- 2013

We propose natural proofs for reasoning with programs that manipulate data-structures against specifications that describe the structure of the heap, the data stored within it, and separation and framing of sub-structures. Natural proofs are a subclass of proofs that are amenable to completely automated reasoning, that provide sound but incomplete… (More)

- Mingsong Chen, Xiaokang Qiu, Wei Xu, Linzhang Wang, Jianhua Zhao, Xuandong Li
- Comput. J.
- 2009

Test case generation based on design specifications is an important part of testing processes. In this paper, Unified Modeling Language activity diagrams are used as design specifications. By setting up several test adequacy criteria with respect to activity diagrams, an automatic approach is presented to generate test cases for Java programs. Instead of… (More)

- Mingsong Chen, Xiaokang Qiu, Xuandong Li
- AST
- 2006

The test case generation from design specifications is an important work in testing phase. In this paper, we use UML activity diagrams as design specifications, and present an automatic test case generation approach. The approach first randomly generates abundant test cases for a JAVA program under testing. Then, by running the program with the generated… (More)

- P. Madhusudan, Gennaro Parlato, Xiaokang Qiu
- POPL
- 2011

We define a new logic, STRAND, that allows reasoning with heap-manipulating programs using deductive verification and SMT solvers. STRAND logic ("STRucture ANd Data" logic) formulas express constraints involving heap structures and the data they contain; they are defined over a class of pointer-structures <i>R</i> defined using MSO-defined relations over… (More)

- P. Madhusudan, Xiaokang Qiu, Andrei Stefanescu
- POPL
- 2012

We develop logical mechanisms and procedures to facilitate the verification of full functional properties of inductive tree data-structures using recursion that are sound, incomplete, but terminating. Our contribution rests in a new extension of first-order logic with recursive definitions called Dryad, a syntactical restriction on pre- and post-conditions… (More)

- Edgar Pek, Xiaokang Qiu, P. Madhusudan
- PLDI
- 2014

The natural proof technique for heap verification developed by Qiu et al. [32] provides a platform for powerful sound reasoning for specifications written in a dialect of separation logic called Dryad. Natural proofs are proof tactics that enable automated reasoning exploiting recursion, mimicking common patterns found in human proofs. However, these proofs… (More)

—Pattern solutions [1] for software and architec-tures have significantly reduced design, verification, and validation times by mapping challenging problems into a solved generic problem. In the paper, we present an architecture pattern for ensuring synchronous computation semantics using the PALS protocol [2]. We develop a modeling framework in AADL to… (More)

- P. Madhusudan, Xiaokang Qiu
- SAS
- 2011

The Strand [10] logic allows expressing structural properties of heaps combined with the data stored in the nodes of the heap. A semantic fragment of Strand as well as a syntactically defined subfrag-ment of it are known to be decidable [10]. The known decision procedure works by combining a decision procedure for MSO on trees (implemented by the tool Mona)… (More)

Program synthesis tools work by searching for an implementation that satisfies a given specification. Two popular search strategies are symbolic search, which reduces synthesis to a formula passed to a SAT solver, and explicit search, which uses brute force or random search to find a solution. In this paper, we propose adaptive concretization, a novel… (More)

- Jinseong Jeon, Xiaokang Qiu, Jonathan Fetter-Degges, Jeffrey S. Foster, Armando Solar-Lezama
- 2016 IEEE/ACM 38th International Conference on…
- 2016

Symbolic execution is a powerful program analysis technique, but it is difficult to apply to programs built using frameworks such as Swing and Android, because the framework code itself is hard to symbolically execute. The standard solution is to manually create a framework <i>model</i> that can be symbolically executed, but developing and maintaining a… (More)