Before calling execute, if a thread's target is null, retire that
thread.
This saves repeatedly checking if the thread's target is null in
recursive calls where even if scratch-gui or blocks, or some other
related library set the target to null, that will not happen during
block execution. It will happen at some time outside of the sequencer
letting the sequencer check once instead of execute checking at every
recursive level.
Store the thread's blocks at blockContainer letting execute quickly
determine the block source. Monitor threads are a monitor thread. They
do not become a target thread suddenly.
When execute calls itself to step into the next stack level, pass
RECURSIVE to the recursiveCall level. This argument provides
opportunity to recursed calls in execute to reduce the time needed for
some checks.
- Reduce time for checking around setting
thread.requestScriptGlowInFrame
- Call thread.pushReportedValue at end of execute when in a recursive
call
A boolean check is faster than a type lookup, command blocks will only
be executed in non-recursive calls. This saves a minor amount of time
for any result reporting blocks like blocks that get variables or add
two inputs together.
If the block is not returning a promise and execute is a recursed call,
that implies that the block is neither a hat or that the thread is not
at the top. That reduces handleReport to pushReportedValue. Using the
recursiveCall argument the final block calling handleReport can
shortcut the extra work in handleReport and reduce it to immediately
calling pushReportedValue.
- Add stackFrame.justReported
Report the block result to a known key `justReported` instead of a
dynamic key on `reported`. Assuming blocks with a promised value are
relatively infrequent the most common recursive input flow immediately
reads the value "just" reported. In the assumed uncommon case of a
promised thread status, empty the already argValues assigned values
onto the currentStackFrame's reported member. In the next execute call
on this stackFrame, values assigned to reported are read back off onto
argValues, and execute will returned to the assumed common case. This
is a safe assumption since a thread in the promise state will not exit
that state until the next frame when javascript has a chance to call
the resolve handle, setting the thread's state back to another
executable state.
Using direct assignment to `justReported` saves building an object
dynamically. Instead of always building `reported` and `argValues` only
`argValues` is built until a promised state is reached. This also gives
a known time when `reported` is used, allowing cleanup of a
stackFrame's reported to only happen when it was used to persist
already reported values.
initDrawable is called in createClone previously, where the new costumes
are installed. Calling this again here erases those loaded skins and
causes an error when trying to calculate the uniforms when a drag
starts.
