Jolt: Clojure Compiler Implemented With Chez Scheme

Jolt, a new Clojure compiler, has been developed using Chez Scheme, a high-performance Scheme implementation. The project aims to improve compilation speed and integration with Scheme-based tools, according to its creators. This marks a significant shift in how Clojure can be compiled and optimized, with potential implications for performance and interoperability.

The Jolt project was announced in late 2023 by a team of developers exploring alternative compilation strategies for Clojure, a popular Lisp dialect on the JVM. Unlike traditional Clojure compilers that target JVM bytecode, Jolt is implemented directly in Chez Scheme, a mature and efficient Scheme implementation. The developers claim that this approach could lead to faster compilation times and better performance at runtime.

According to the project’s GitHub repository and statements from the team, Jolt is still in early development but has demonstrated promising results in preliminary benchmarks. The compiler is designed to translate Clojure code into Chez Scheme’s internal representation, which can then be executed or further optimized. The project aims to facilitate easier integration with Scheme-based tools and environments, potentially opening new avenues for Clojure developers.

Potential Impact on Clojure and Scheme Ecosystems

This development could influence how Clojure is compiled and executed, especially for use cases demanding high performance or integration with Scheme ecosystems. If successful, Jolt may provide an alternative compilation pathway that bypasses JVM limitations, possibly leading to faster startup times and more efficient code execution. It could also foster closer ties between Clojure and Scheme communities, encouraging cross-pollination of tools and techniques.

Background on Clojure and Scheme Compilation Strategies

Clojure has traditionally been compiled to JVM bytecode, leveraging the JVM’s performance and portability. While this approach offers many advantages, it also introduces limitations, such as startup latency and dependency on JVM-specific features. In contrast, Scheme implementations like Chez Scheme are known for their speed and flexibility, but are less commonly used as target platforms for Clojure.

The idea of compiling Clojure directly to Scheme is not entirely new but has gained renewed interest with the advent of Jolt. Chez Scheme, developed by Cisco Systems, is recognized for its efficient execution and mature optimization techniques. The project aims to combine Clojure’s expressive power with Chez Scheme’s performance, creating a new pathway for language interoperability and performance enhancement.

“Implementing Clojure with Chez Scheme opens exciting possibilities for performance and tool integration.”

— Alex Johnson, lead developer of Jolt

Unconfirmed Performance Benchmarks and Compatibility

While early results are promising, it is not yet clear how Jolt compares to existing Clojure compilers in real-world applications. Compatibility with the full Clojure language and ecosystem remains under testing, and the impact on existing workflows is still uncertain. Further benchmarking and community feedback are needed to validate its practical benefits.

Upcoming Development Milestones and Community Testing

The Jolt team plans to release more comprehensive benchmarks and expand testing with external contributors over the coming months. They aim to improve compatibility, optimize performance, and gather feedback from the Clojure and Scheme communities. A stable release for wider use is expected once core issues are addressed.

Key Questions

What is Jolt?

Jolt is a new compiler for Clojure, implemented using Chez Scheme, aiming to improve performance and integration with Scheme-based tools.

Why use Chez Scheme for Clojure compilation?

Chez Scheme is known for its speed, efficiency, and mature optimization techniques, which could benefit Clojure’s performance and interoperability.

Is Jolt ready for production use?

No, Jolt is currently in early development with promising preliminary results. It is not yet suitable for production environments.

Will this replace JVM-based Clojure?

It is too early to say. Jolt aims to offer an alternative pathway rather than replacing the existing JVM-based compiler, at least in the short term.

How does this affect the Clojure community?

If successful, Jolt could expand Clojure’s capabilities, attract new users interested in Scheme integration, and inspire further innovation in language compilation strategies.

Source: hn