JIT Compiler

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JIT compiler specification

The JIT compiler in JRuby runs when executing interpreted code.

  • The default threshold for a method body to compile is 20 invocations
  • Compilation of a method includes compilation of all contained closures
  • Closure bodies will not compile alone; the containing method must compile
  • JITted methods are single-method transient classes, loaded into their own classloaders using unique class names and thrown away when the method that references the class instance goes away
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