The frontend appears to alread pessimize its prediction of
object property types whenever an UnsetContext might affect a given
property. We can use this to avoid checking for KindOfUninit when
doing specialized prop gets in the vectortranslator. This is
hopefully going to be worth more than it sounds, because it will let
us avoid a spillStack, which is a use of the frame and will prevent an
inlined getter from removing the ActRec (unless we implement some kind
of sinking for frames).
This is the first part of the work to expose type constraint and generic all the way to reflection. This first DIFF exposes the return type with generic types coming next.
unserialize() and call_user_func_array() were straightforward. They were
called from all over the runtime, but I renamed those implementations
and codemodded the runtime.
The is_* functions were only ever being called by the CVarRef signature,
so I deleted all the other ones (same for f_gettype). Only some of the
is_* functions were being called from the runtime, so I made inline
versions of those without the f_ prefix.
This change is mostly for FB internal organizational reasons.
Building is not effected beyond the fact that the target now
lands in hphp/hhvm/hhvm rather than src/hhvm/hhvm.
jdelong