JDK-8059370 : Unnecessary work in deoptimizing recompilation
  • Type: Bug
  • Component: core-libs
  • Sub-Component: jdk.nashorn
  • Affected Version: 9
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2014-09-29
  • Updated: 2015-06-04
  • Resolved: 2014-10-01
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8u40Fixed 9 b34Fixed
There's a whole unnecessary reparse and compilation up to bytecode as part of the deoptimizing recompilation pipeline in CompiledFunction.handleRewriteException:

        FunctionNode fn2 = effectiveOptInfo.reparse();
        fn2 = compiler.compile(fn2, CompilationPhases.COMPILE_UPTO_BYTECODE);

It's possibly a remnant of some debugging that slipped through unnoticed. This probably almost doubled the deoptimizing recompilation work.