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  1. JDK
  2. JDK-8235521

Replacement API for Unsafe::ensureClassInitialized

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Details

    • Enhancement
    • Resolution: Fixed
    • P3
    • 15
    • None
    • core-libs
    • None

    Description

      A class may also be initialized as a result of execution of other bytecodes such as getstatic, new, putstatic, invokestatic etc as specified in JVMS 5.5.

      `Class::forName` and `Unsafe::ensureClassInitialized` are existing workaround to initialize a Class. It's cumbersome to use Class::forName to initialize a class and many JDK classes use `Unsafe::ensureClassInitialized` rather than Class::forName to initialize a class.

      One typical use of `Unsafe::ensureClassInitialized` to force class initialization is to enable JIT inlining as well as the method handle can avoid the class initialization barrier.

      The other use of `Unsafe::ensureClassInitialized` to force class initialization is to ensure that private static members are initialized and published to other classes (outside its nest) to access, e.g. shared secrets.

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              mchung Mandy Chung
              mchung Mandy Chung
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