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  Escape Analysis  (Read 5434 times)
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« Posted 2014-04-25 08:22:13 »

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Overview


Yet another stub -- is probably completely wrong

HotSpot details


Like all HotSpot features this can only describe a particular version (JDK8 snapshot on 20140425)

https://wikis.oracle.com/display/HotSpotInternals/EscapeAnalysis

For spot checking of impact escape analysis can be disable by: -XX:-DoEscapeAnalysis

Partial list of situations where HotSpot conservatively assumes a reference escapes:
  • The reference is passed to an invokedynamic call (e.g. lambda and method references)
  • The reference is passed to an instance method where the call isn't known to be monomorphic (the method can be overridden).
  • The reference is passed through a great call chain depth than MaxBCEAEstimateLevel
  • The reference is passed to method whos bytecode size is greater than MaxBCEAEstimateSize

Detailed information about escape analysis can be queried with: BCEATraceLevel

HotSpot source code:
hotspot/src/share/vm/ci/bcEscapeAnalyzer.cpp
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