# facebook/hhvm

A virtual machine for executing programs written in Hack.

Repository: https://github.com/facebook/hhvm
Canonical: https://ross.abutalabs.com/products/hhvm
Homepage: https://hhvm.com
Language: C++
License: NOASSERTION
License Family: other
Topics: hhvm, php, hack, hacklang
Last push: 2026-08-27T00:12:40+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 6088, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 18655, forks 3070 (observed 2026-08-28T04:11:27.005887+00:00)

## What it is
HHVM is an open-source virtual machine with a just-in-time (JIT) compiler for executing programs written in the Hack programming language. It includes a built-in Proxygen webserver, FastCGI support, and the Hack typechecker, and is developed by Facebook/Meta.

## Use cases
- run Hack programs from the command line
- host a website written in Hack behind Proxygen or nginx with FastCGI
- typecheck Hack code with the bundled Hack typechecker
- get JIT-compiled performance for Hack web applications
- serve Hack scripts over HTTP with a built-in webserver

## When to choose
- you are building or running applications written in Hack
- you need a high-performance JIT runtime for Hack code
- you want an all-in-one runtime, webserver, and typechecker for Hack
- you maintain a legacy PHP/Hack codebase that runs on HHVM

## When to avoid
- you are starting a new PHP project, since HHVM no longer targets PHP
- you need a runtime on Windows or macOS, as official support is Linux-only
- you want a general-purpose scripting VM unrelated to Hack

## Facets
- artifact type: application
- maturity: active
- function: interpreter, compiler, http-server, type-system, cli
- domain: programming-languages, compilers, web-development, backend, developer-tools
- platform: cpp, cli
- tags: jit-compiler, virtual-machine, hack-language, php-runtime, fastcgi, proxygen, bytecode, linux, web-server

## Member repositories
- facebook/hhvm (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:27.005887+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:01:20.646928+00:00, confidence not recorded.
  - readme: https://github.com/facebook/hhvm (fetched 2026-08-28T04:11:27.005887+00:00, sha 6da837ea6821)
  - homepage: https://hhvm.com (fetched 2026-08-29T07:59:24.355077+00:00, sha 15c8f6bcc7d3)
  - site_page: https://docs.hhvm.com/hhvm/installation/introduction (fetched 2026-08-29T07:59:24.364009+00:00, sha cb5814d70e20)
  - site_page: http://docs.hhvm.com/hhvm-overview (fetched 2026-08-29T07:59:24.365732+00:00, sha c8aebf3ab5c5)
- Data as of 2026-08-30T08:39:29.467469+00:00.