Skip to content
<awesome-gh-repos>
vic

facebook/hhvm

A virtual machine for executing programs written in Hack.
Source code at GitHub https://hhvm.com
facebook/hhvm.json
{
  "createdAt": "2010-01-02T01:17:06Z",
  "defaultBranch": "master",
  "description": "A virtual machine for executing programs written in Hack.",
  "fullName": "facebook/hhvm",
  "homepage": "https://hhvm.com",
  "language": "C++",
  "name": "hhvm",
  "pushedAt": "2025-11-27T03:14:07Z",
  "stargazersCount": 18547,
  "topics": [
    "hack",
    "hacklang",
    "hhvm",
    "php"
  ],
  "updatedAt": "2025-11-27T03:14:13Z",
  "url": "https://github.com/facebook/hhvm"
}

HHVM

Section titled “HHVM”

HHVM page | HHVM documentation | Hacklang page | General group | Dev group | Twitter

HHVM is an open-source virtual machine designed for executing programs written in Hack. HHVM uses a just-in-time (JIT) compilation approach to achieve superior performance while maintaining amazing development flexibility.

HHVM should be used together with a webserver like the built in, easy to deploy Proxygen, or a FastCGI-based webserver on top of nginx or Apache.

Installing

Section titled “Installing”

If you’re new, try our getting started guide.

You can install a prebuilt package or compile from source.

Running

Section titled “Running”

You can run standalone programs just by passing them to hhvm: hhvm example.hack.

If you want to host a website:

  • Install your favorite webserver. Proxygen is built into HHVM, fast and easy to deploy.
  • Install our package
  • Start your webserver
  • Run sudo /etc/init.d/hhvm start
  • Visit your site at http://.../main.hack

Our getting started guide provides a slightly more detailed introduction as well as links to more information.

Contributing

Section titled “Contributing”

We’d love to have your help in making HHVM better. If you’re interested, please read our [guide to contributing]!(CONTRIBUTING.md).

License

Section titled “License”

HHVM is licensed under the PHP and Zend licenses except as otherwise noted.

The [Hack typechecker]!(hphp/hack) is licensed under the MIT [License]!(hphp/hack/LICENSE) except as otherwise noted.

The [Hack Standard Library]!(hphp/hsl) is licensed under the MIT [License]!(hphp/hsl/LICENSE) except as otherwise noted.

Reporting Crashes

Section titled “Reporting Crashes”

See Reporting Crashes for helpful tips on how to report crashes in an actionable manner.

Security

Section titled “Security”

For information on reporting security vulnerabilities in HHVM, see [SECURITY.md]!(SECURITY.md).

FAQ

Section titled “FAQ”

Our user FAQ has answers to many common questions about HHVM, from general questions to questions geared towards those that want to use.

There is also a FAQ for contributors to HHVM.