Drew Paroski
84b9d9a3a2
In HHVM (and HPHPc before it) we've been piggybacking resources on the KindOfObject machinery. At the language level, resource is considered to be a different type than object, and there are a number of differences in behavior between objects and resources (ex. resources don't allow for dynamic properties, resources don't work with the clone operator, the "(object)" cast behaves differently for resources vs. objects, etc). Piggybacking resources on the KindOfObject machinery has some downsides. Code that deals with KindOfObject values often needs to check if the value is a resource and go down a different code path. This makes things harder to maintain and harder to keep parity with Zend. Also, these extra branches hurt performance a little, and they make it harder for the JIT to do a good job in some cases when its generating machine code that operates on objects. This diff prepares the code base for a new KindOfResource type by adding a new "Resource" smart pointer type (currently a typedef for the Object smart pointer type) and it updates the C++ code and the idl files appropriately. This diff is essentially a cosmetic change and should not impact run time behavior. In the next diff (part 2) we'll actually add a new KindOfResource type, detach ResourceData from the ObjectData inheritence hierarchy, and provide a real implementation for the Resource smart pointer type (instead of just aliasing the Object smart pointer type).
HipHop VM for PHP 
HipHop VM (HHVM) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. HipHop VM (and before it HPHPc) has realized > 5x increase in throughput for Facebook compared with Zend PHP 5.2.
HipHop is most commonly run as a standalone server, replacing both Apache and modphp.
Installing
You can install a prebuilt package or compile from source.
Running
You can run standalone programs just by passing them to hhvm: hhvm my_script.php.
HipHop bundles in a webserver. So if you want to run on port 80 in the current directory:
sudo hhvm -m server
For anything more complicated, you'll want to make a config.hdf and run sudo hhvm -m server -c config.hdf.
Contributing
We'd love to have your help in making HipHop better. If you run into problems, please open an issue, or better yet, fork us and send a pull request. Join us on #hhvm on freenode.
If you want to help but don't know where to start, try fixing some of the Zend tests that don't pass. You can run them with hphp/test/run. When they work, move them to zend/good and send a pull request.
Before changes can be accepted a Contributors Licensing Agreement (pdf - print, sign, scan, link) must be signed.
Licence
HipHop VM is licensed under the PHP and Zend licenses except as otherwise noted.