mwilliams
99f3924872
After my rewrite to use the FunctionnEnter hook to implement intercept, there was a potential problem. If an intercept handler was intercepted, and we hadn't yet jitted the prolog for the intercept handler, and we lost the race to jit it, and the intercept handler threw an exception, the unwinder could skip some c++ frames, and fail to unwind a re-entry. This was caused by attempting to emulate the previous intercept behavior, where the original function is not included in the backtrace. I don't think thats necessary; for one thing, the intercept handler has always appeared in the backtrace, even though its (generally) not the replacement function, but a function that forwards to the replacement function. So this diff just leaves the original function's fraem in place. If the backtraces *do* turn out to be problematic, I'll fix it later in debugBacktrace.
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.