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  1. JDK
  2. JDK-8171335

MethodHandle.Lookup functionality to define a nestmate class

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    Description

      The method Unsafe.defineAnonymousClass:

          public Class<?> defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches) {

      is used in a few areas to define anonymous classes such as LambdaMetaFactory (although only one use leverages the constant pool patch ing).

      The defining of a class (anonymous or otherwise) within the context of a hosted class can be referred to as defining a "nest mate" class.

      A subset of such functionality could be supported as a method on MethodHandle.Lookup:

        public Class<?> defineNestmate(boolean anonymous, byte[] bytes)

      Where the lookup class is the context for the nest, and where the method only functions if the lookup supports private access.

      Code in LambdaMethodFactory and StringConcatFactory could be updated to use the public method.

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          duplicates

          Enhancement - null JDK-8238358 Implementation of JEP 371: Hidden Classes

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved
          is blocked by

          Enhancement - null JDK-8227415 [nestmates] IllegalAccessError using a protected method reference declared in super class in different package

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8098817 Adjust access checks for VM anonymous classes

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Enhancement - null JDK-8230501 Class data support for hidden classes

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8243287 Removal of Unsafe::defineAnonymousClass

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-6653858 dynamic languages need to be able to load anonymous classes

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8209676 Dynamic nestmate injection in the VM

          • P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8219612 [TESTBUG] compiler.codecache.stress.Helper.TestCaseImpl can't be defined in different runtime package as its nest host

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8213465 Type variable information is not always maintained for anonymous classes

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8212620 Provide a mechanism to allow a class/method to request filtering from the stack trace

          • P3 - Major loss of function.
          • Open

          Enhancement - null JDK-8213402 [Testbug] java/lang/System/LoggerFinder/internal/PlatformLoggerBridgeTest creates an invalid nest relationship

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8235521 Replacement API for Unsafe::ensureClassInitialized

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8230502 Add support in JVM TI, JDI, and Instrumentation for hidden classes

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed

          Enhancement - null JDK-8172672 Unsafe.defineAnonymousClass should not require non-null host class argument

          • P3 - Major loss of function.
          • Closed

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              mchung Mandy Chung
              psandoz Paul Sandoz
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                Created:
                Updated:
                Resolved: