Mozilla on Synthesizing Loop-Free Programs with Rust and Z3 and on Privacy
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Synthesizing Loop-Free Programs with Rust and Z3
Automatically finding a program that implements a given specification is called program synthesis. The main difficulty is that the search space is huge: the number of programs of size \(n\) grows exponentially. Naïvely enumerating every program of size \(n\), checking whether each one satisfies the specification, and then moving on to programs of size \(n+1\) and so on doesn’t scale. However, the field has advanced by using smarter search techniques to prune the search space, leveraging performance improvements in SMT solvers, and at times limiting the scope of the problem.
In this post, I’ll explain one approach to modern program synthesis: counterexample-guided iterative synthesis of component-based, loop-free programs, as described in Synthesis of Loop-Free Programs by Gulwani et al. We’ll dissect exactly what each of those terms mean, and we’ll also walk through an implementation written in Rust that uses the Z3 solver.
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No judgment digital definitions: Online advertising strategies
It’s hard to go anywhere on the internet without seeing an ad. That’s because advertising is the predominant business model of the internet today. Websites and apps you visit every day are largely “free” for you because they monetize your data and your attention through advertising. And, as data sets of individuals and groups online have become more readily available to companies in recent years, advertisers have developed strategies to minimize what they spend on ads while maximizing the profit made from them. The ad tech arms race is constantly evolving, and the more invasive practices that are used, the more valuable your data is. Here are some of the most common online advertising strategies and associated activities being used that rely on collecting data about you today.
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