tree ce14172ed7d7dc8874ea282a97d41f4b380f419e
parent a006514ea138a29b6031058d9002b48a572b5dd6
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1540922659 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1540922659 -0300

Back with optimization for 'if cond then goto'

Statements like 'if cond then goto label' generate code so that the
jump in the 'if' goes directly to the given label. This optimization
cannot be done when the jump is backwards leaving the scope of some
variable, as it cannot add the needed 'close' instruction. (The jumps
were already generated by the 'if'.)

This commit also added 'likely'/'unlikely' for tests for errors in
the parser, and it changed the way breaks outside loops are detected.
(Now they are detected like other goto's with undefined labels.)