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PLDI 2020
Mon 15 - Fri 19 June 2020
Fri 19 Jun 2020 08:00 - 08:20 at PLDI Research Papers live stream - Synthesis III Chair(s): Santosh Nagarakatte

We consider the problem of automatically establishing that a given syntax-guided-synthesis (SyGuS) problem is unrealizable (i.e., has no solution). We formulate the problem of proving that a SyGuS problem is unrealizable over a finite set of examples as one of solving a set of equations: the solution yields an overapproximation of the set of possible outputs that any term in the search space can produce on the given examples. If none of the possible outputs agrees with all of the examples, our technique has proven that the given SyGuS problem is unrealizable. We then present an algorithm for exactly solving the set of equations that result from SyGuS problems over linear integer arithmetic (LIA) and LIA with conditionals (CLIA), thereby showing that LIA and CLIA SyGuS problems over finitely many examples are decidable. We implement the proposed technique and algorithms in a tool called Nay. Nay can prove unrealizability for 70/132 existing SyGuS benchmarks, with running times comparable to those of the state-of-the-art tool Nope. Moreover, Nay can solve 11 benchmarks that Nope cannot solve.

Fri 19 Jun

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08:00 - 09:00
Exact and Approximate Methods for Proving Unrealizability of Syntax-Guided Synthesis Problems
PLDI Research Papers
Qinheping Hu University of Wisconsin-Madison, USA, John Cyphert University of Wisconsin-Madison, USA, Loris D'Antoni University of Wisconsin-Madison, USA, Thomas Reps University of Wisconsin-Madison, USA
Question Selection for Interactive Program Synthesis
PLDI Research Papers
Ruyi Ji Peking University, China, Jingjing Liang Peking University, China, Yingfei Xiong Peking University, China, Lu Zhang Peking University, China, Zhenjiang Hu Peking University, China
Reconciling Enumerative and Deductive Program Synthesis
PLDI Research Papers
Kangjing Huang Purdue University, USA, Xiaokang Qiu Purdue University, USA, Peiyuan Shen Purdue University, USA, Yanjun Wang Purdue University, USA