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HHVM, or HipHop Virtual Machine, is an open-source virtual machine specifically designed for executing programs written in Hack, a programming language. Developed by Meta, formerly known as Facebook^[1], HHVM was conceived as a successor to HipHop for PHP (HPHPc). It operates on the principle of Just-In-Time (JIT) compilation, a technique used for efficient code execution. HHVM introduced an intermediate bytecode format known as HHBC, simplifying the processes of development and deployment. It is recognized for its exceptional performance capabilities, including high web server throughput, reduced latency, and dynamic optimization of x86-64 machine code. Further, it’s linked to other technologies like LLVM, Parrot virtual machine, and Phalanger. The source code of HHVM is available on GitHub^[2], and it’s licensed under PHP and Zend Licenses.

Terms definitions

1. ↑ Facebook ( Facebook ) Facebook, now known as Meta Platforms, is a major Internet company that started as a social networking platform. Founded by Mark Zuckerberg in 2004, Facebook expanded rapidly from Harvard to other universities and later to the general public, becoming a global phenomenon. It is known for its user-friendly interface and various features such as Groups, the Developer Platform, and Facebook Dating. Despite facing criticism for issues like privacy breaches and the spread of fake news, Facebook has remained a dominant player in the online world. It has made significant strides in the field of technology, including the development of its unique data storage system, the use of PHP for its platform, and the launch of the Hack programming language. In recent years, the company has shifted its focus to the metaverse, a virtual reality space where users can interact with a computer-generated environment.

2. ↑ GitHub ( GitHub ) GitHub is a platform designed specifically for developers. It provides a space for creating, storing, managing, and sharing code. The platform is built on Git software, which enables version control, access control, and bug tracking, among other features. Being a Microsoft subsidiary since 2018, GitHub has made a name for itself as a host for open source software projects. As of January 2023, it boasts of a community of over 100 million developers and houses more than 420 million repositories. GitHub was brought to life in 2008 by its four founders. It started as a flat organization, promoting autonomy, flexibility, and collaboration among its employees. Beyond version control, GitHub also offers services like task management, continuous integration, and support for project wikis. It's not just a platform; it's a comprehensive toolkit for software development.

Glossary

HHVM (Wikipedia)

HipHop Virtual Machine (HHVM) is an open-source virtual machine based on just-in-time (JIT) compilation that serves as an execution engine for the Hack programming language. By using the principle of JIT compilation, Hack code is first transformed into intermediate HipHop bytecode (HHBC), which is then dynamically translated into x86-64 machine code, optimized, and natively executed. This contrasts with PHP's usual interpreted execution, in which the Zend Engine transforms PHP source code into opcodes that serve as a form of bytecode, and executes the opcodes directly on the Zend Engine's virtual CPU.

HHVM

Developer(s)	Meta Platforms
Initial release	December 9, 2011; 12 years ago (2011-12-09)

Stable release	3.15.0 / 28 September 2016; 7 years ago (28 September 2016)

Repository	github.com/facebook/hhvm
Written in	PHP, C++, OCaml and Rust
License	PHP License and Zend License
Website	hhvm.com

HHVM is developed by Meta, with the project's source code hosted on GitHub; it is licensed under the terms of the PHP License and Zend License.

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