Details
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Enhancement
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Status: Resolved
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P3
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Resolution: Fixed
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None
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None
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b27
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.
`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.
Attachments
Issue Links
- csr for
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JDK-8245871 Define Lookup::ensureInitialized as a replacement API for Unsafe::ensureClassInitialized
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- Closed
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- relates to
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JDK-8247247 JFR tests fail due to JDK-8235521 missing doPrivileged block
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- Resolved
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- Resolved
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- Open
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- Resolved
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- Resolved
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(1 relates to)