---
title: Self-Hosting Status
nav_order: 12
---

# MIRR Self-Hosting Compiler Status

> **Status:** In Progress
> **Last updated:** 2026-03-20 (Campaign D)

## Executive Summary

The `compiler_mirr/` directory contains the MIRR-in-MIRR implementation for self-hosting.
The project uses an incremental porting strategy, preserving original implementations
as `.bak` files while building minimal, parseable primitives to unblock the bootstrap process.

This page tracks the current porting work for the hosted MIRR-in-MIRR compiler path.
For the achieved stage-1 milestone, see [docs/self_hosting_milestone.md](self_hosting_milestone.md).

## Module Status

| Module | Status | Porting % | Notes |
|--------|--------|-----------|-------|
| `lexer.mirr` | In Progress | 45% | Two-char ops and digit detection ported; identifier classification partial |
| `parser.mirr` | In Progress | 70% | Core state machine implemented; expression parsing functional |
| `semantic.mirr` | In Progress | 60% | Multi-pass structure in place; validation logic basic |
| `emitter.mirr` | In Progress | 55% | State machine emission; output generation functional |
| `temporal_lowering.mirr` | In Progress | 40% | Guard compilation structure in place; reflex lowering partial |
| `main.mirr` | In Progress | 80% | Entry point and orchestration logic implemented |
| `test_main.mirr` | In Progress | 75% | Test runner framework implemented |
| `PORTING_STEPS.md` | Complete | 100% | Migration plan documented |
| `README.md` | Complete | 100% | Documentation complete |

## Overall Progress

**Estimated total porting: ~58%**

## Blockers

1. **Pattern expansion** — Not yet ported to MIRR
2. **S-expression conversion** — Not yet ported to MIRR
3. **Width inference** — Not yet ported to MIRR
4. **SAT simplification** — Not yet ported to MIRR
5. **MAPE-K integration** — Not yet ported to MIRR

## Next Steps

1. Complete lexer identifier classification
2. Port pattern expansion module
3. Port S-expression conversion
4. Integrate width inference
5. Run full bootstrap test suite