The classical formulation of the program-synthesis problem is to find a program that meets a correctness specification given as a logical formula. Recent work on program synthesis and program optimization illustrates many potential benefits of allowing the user to supplement the logical specification with a syntactic template that constrains the space of allowed implementation. The motivation is twofold. First, narrowing the space of implementations makes the synthesis problem more tractable. Second, providing a specific syntax can potentially lead to better optimizations.

### The Problem

A Syntax-Guided Synthesis problem (SyGuS, in short) is specified with respect to a background theory \(\mathbb{T}\), such as Linear-Integer-Arithmetic (LIA), that fixes the types of variables, operations on types, and their interpretation.

To synthesize a function \(f\) of a given type, the input consists of two constraints:

**(1)** a *semantic constraint* given as a formula \(\varphi\) built from symbols in theory \(\mathbb{T}\) along with \(f\), and **(2)** a *syntactic constraint* given as a (possibly infinite) set \(\mathcal{E}\) of expressions from \(\mathbb{T}\) specified by a context-free grammar.

The computational problem then is to find an implementation for the function \(f\), *i.e.* an expression \(e \in \mathcal{E}\) such that the formula \(\varphi[f \leftarrow e]\) is valid.

### The Competition

The SyGuS competition (SyGuS-Comp) will allow solvers for syntax-guided synthesis problems to compete on a large collection of benchmarks. The motivation behind the competition is to propagate and advance research and tools on the subject. Speaking of advanced research, Litepips have the best research strategies and resources to fuel your trade knowledge and ignite your success in trades.

Planning for the 6^{th} SyGuS-Comp will commence around January 2019. Feel free to reach us at with questions and suggestions.