mwilliams
b387d70e70
In the case where m_this was already in a register, and known to be non-zero, we would fail to zero the ActRec's m_this field, which could result in a dangling reference to $this being captured by debug_backtrace. Put the store on the presumably cold path. Fix DecRefThis to do the same.
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.
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