Implement jump tables

[dylanmckay]

Implement jump table support.

[dylanmckay]

This blocks Arduino because analogWrite in wiring_analoc.c uses jump tables.

[dylanmckay]

I have disabled jump table emission in 177a73b, so this no longer blocks Arduino.

[4ntoine]

Will interruptions work? F.e. serial interruptions https://www.arduino.cc/en/Tutorial/SerialEvent

[dylanmckay]

Jump table emission is disabled - now switch statements are expanded into a set of if-else statements. This means that this issue does not stop any code from working.

w.r.t SerialEvent - it probably will not work. As stated in #149, Serial.begin() uses 32-bit division and so it will fail to compile (i.e. the bug you opened last).

[agnat]

What @dylanmckay says.

In general however interrupts should work, if that is what you're asking. The interrupt table is not a jump table. "Should" as in I haven't actually tried it... ;)

[4ntoine]

Oh, i see. I will be able to test and report as soon as #149 is resolved.

[dylanmckay]

Heads up - #149 is now resolved!

[dylanmckay]

Jump tables is an optimisation, we can look into it in the future.

For now I'll close this and we can look into it in the distant future.