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  1. JDK
  2. JDK-8288334

Support old classes in dynamic CDS

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    Description

      Symptom:

      When old classes are loaded during dynamic CDS dump, they are usually linked during app execution. As part of linking, the class is verified by the old verifier, which is not supported by CDS. As a result, these old classes are not stored in the CDS image.

      Proposed fix:
      Revert the linked old classes to unlinked state, so that they can be verified again during runtime.

      This can be done by parsing the class again and storing the newly parsed (but not linked) InstanceKlass into the CDS archive. Something similar to

      https://github.com/openjdk/jdk/blob/8e4ef818a90de35ae75e7f82a780653d623bb29c/src/hotspot/share/cds/lambdaFormInvokers.cpp#L186




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          relates to

          Enhancement - null JDK-8308463 Refactor regenerated class handling in lambdaFormInvokers.cpp

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

          Enhancement - null JDK-8309074 Store verified old classes in CDS archive

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

          Enhancement - null JDK-8317269 [premain] Archive old classes in verified state when CDSLoadedClasses is enabled

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

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              ccheung Calvin Cheung
              iklam Ioi Lam
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              Dates

                Created:
                Updated: