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From "Chunrong Lai (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4494) VM modification for class unloading
Date Thu, 19 Jul 2007 02:12:04 GMT
VM modification for class unloading
-----------------------------------

                 Key: HARMONY-4494
                 URL: https://issues.apache.org/jira/browse/HARMONY-4494
             Project: Harmony
          Issue Type: Sub-task
          Components: VM
         Environment: win32
            Reporter: Chunrong Lai



 The patch is not intended for commit but only for review purpose.
 I did them in VM side (to SVN HEAD) to test the GCv5's CU work where the references from
native heap to java heap (m_loader, m_class_handle, vtable->jIC) are enumerated as weak
roots at certain time. Then GCv5 will trace the strong roots and update the weak roots. 
 Currently the intergated version can pass smoke test, specjbb and several other benchmarks.
It also successfully unloaded the classloaders when running the test case in "Test_unloading_native_lib.zip".
 There are two more issues:
    (1) Attached is just an unconditional-unloading approach. Extra interfaces are needed
to achieve selective unloading.
    (2) Some code refinements need to be done if running in 64bits environment since GC and
VM use different code conventions to compress the references. If VM use the uncompressed "ManagedObject*
vtable->jIC" as in the attachment we only need enhance GC in future.


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