eirproject/eir

---

eirproject/eir.json

{
  "createdAt": "2017-07-30T00:31:48Z",
  "defaultBranch": "master",
  "description": "Erlang ecosystem common IR",
  "fullName": "eirproject/eir",
  "homepage": "",
  "language": "Rust",
  "name": "eir",
  "pushedAt": "2021-02-13T18:06:00Z",
  "stargazersCount": 252,
  "topics": [
    "hacktoberfest"
  ],
  "updatedAt": "2025-08-27T16:44:38Z",
  "url": "https://github.com/eirproject/eir"
}

Eir Project

Erlang compiler and IR implemented in Rust

Details

Current features:

• Unified Thorin based IR representation named Eir
• Erlang frontend
• Core frontend
• Pattern match compilation passes
• Basic optimization and cleanup passes
• Naive interpreter used for testing

The project is split into several crates:

• libeir_ir - Contains the core Eir IR data structures, validation, printing
• libeir_syntax_erl - Frontend for Erlang, lowers to Eir.
• libeir_syntax_core - Frontend for Core Erlang, lowers to Eir.
• libeir_passes - Compiler passes operating on Eir.
• libeir_lowerutils - Utilities for lowering Eir to SSA form.
• libeir_interpreter - Naive interpreter for Eir. Used to run OTP test suites.
• libeir_intern - Symbol interning. Used by most other crates.
• libeir_diagnostics - Source span handling and diagnostics printing.
• libeir_util - Kitchen sink of utilities used by other crates.
• pattern-compiler - A generic pattern matching tree compiler.
• tools - CLI tools used to work with the IR.