JDK-8164044 : Generate corresponding simple DelegatingMethodHandles when generating a DirectMethodHandle at link time
  • Type: Sub-task
  • Component: core-libs
  • Sub-Component: java.lang.invoke
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2016-08-15
  • Updated: 2016-08-25
  • Resolved: 2016-08-18
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JDK 9
9 b133Fixed
Description
Generating simple rebind and delegate forms of all the DirectMethodHandles is one way to further reduce the number of classes we generate at runtime.
Comments
Internal review and comments led to a bit of redesign, but also picking up some additional delegating MHs: http://cr.openjdk.java.net/~redestad/8164044/webrev.02 This reduces generated classes by 11, adds 2 static, reduces executed bytecodes further (~60K) and still maintain ~10ms improvement on total execution time (at least part of the improvement here is due to JIT threshold effects during bootstrap)
17-08-2016
First webrev (pending tests): http://cr.openjdk.java.net/~redestad/8164044/webrev.01/index.html In a test which simply exercise a string concatenation: public static void main(String ... args) throws Exception { System.out.println("Concat: " + args.length); } The effect is a reduction in number of classes generated by 8, a reduction in executed bytecodes by 43K and a ~10ms improvement on total execution time.
15-08-2016