The version handling in LangUtil has been overhauled
to cope better with post 1.8 releases (JDK9 and JDK10 or 18.3
or whatever they call it). As part of this moved
to treating JDK9 as '9' rather than '1.9'. Also removed
duplicate version processing logic and had that defer to
the one place in LangUtil where we now deal with it.
Includes some generics tidyup in ajdoc. More ajdoc work
is necessary for Java10 because it removes the standard doclet
(old style). However trying to invoke the internal Javadoc
handler in Java10 is failing due to module visibility rules.
Lazy instantiation of thisJoinPoint
Speed-ups of 10-100X are measured even when running a small test case with minimal GC issues.
The actual feature implemented is that thisJoinPoint objects are only created just before calling the method for advice that requires them. To take advantage of this feature you must use an if PCD or some other dynamic test that occurs in the PCD not the advice body to guard the expensive creation of the thisJoinPoint object.
-XlazyTjp flag must be passed to compiler to enable this feature.
If any around advice is present on the joinpoint then lazy instantiation
will be disabled. An Xlint warning will be displayed in this case.
As a related optimization, several helper methods were added to
Factory.makeJP to reduce the code size when thisJoinPoint is used.
Andy Clement
aclement