Introduction

Writing a compiler is a fascinating and complex task that demands a deep understanding of programming languages, optimization techniques, and the intricacies of translating source code into executable machine code. Many programmers undertake this journey for a variety of reasons, including curiosity, the need for a more optimized solution, and a desire to innovate and create something unique. This article explores these motivations and categorizes the reasons why programmers write their own compilers.

1. Education and Curiosity

For many programmers, the primary motivation is pure curiosity and a thirst for knowledge. Writing a compiler is an educational experience that helps them understand how programming language design, parsing techniques, and code optimization work. This experience can be both enriching and challenging, pushing individuals to explore new ideas and techniques.

Programmers in this category may choose to write esoteric programming languages such as Brainfuck, Malbolge, orWhitespace. These languages, often created just for amusement, can be as simple or complex as the programmer desires, reflecting their curiosity and creativity. This exploratory nature is a hallmark of this group, and projects like Crafting Interpreters by Robert Nystrom can provide invaluable insights into the process.

2. Realistic Need for Optimization

Another common reason for writing a compiler is the need for optimization in specific projects. This is particularly relevant in contexts where the compiler needs to be tailored for specific use cases or hardware architectures, allowing for more efficient and specialized code generation. Languages like Go, Dart, Crystal, Rust, and Erlang are examples of such projects. These languages are designed to offer optimized performance and are often preferred by developers who need a deep level of control over the compilation process.

3. Frustration and Innovation

A third reason for writing a compiler is a deep frustration with the existing state of language systems. This frustration is often followed by a fiery desire to solve the problem by reinventing the foundational ideas. These passion projects often result in unique and innovative languages, such as Lisp, Smalltalk, Perl, JavaScript, and Rust. Such languages are often born from a developer's dissatisfaction with the current tools and the desire to create something better.

For those in this category, projects such as Jai, HolyC, Idris, and Scratch can be a stepping stone for building something truly groundbreaking.

Conclusion

Writing a compiler is a rewarding project that serves multiple purposes: it can be an educational experience, a solution for performance optimization, or a means of innovation and customization. Whether driven by curiosity, a need for optimization, or a desire for innovation, programmers who write their own compilers often achieve something unique and valuable. Whether you are a beginner in the field or an experienced developer, exploring the depths of compiler writing can lead to exciting and meaningful experiences.

References:

Crafting Interpreters - Robert Nystrom Go Dart Crystal Rust Erlang Lisp Smalltalk Perl JavaScript Lua