[jira] Commented: (HARMONY-3462) [dlrvm] new j.l.Class tracing model

["Aleksey Ignatenko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-3462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493329 ] 

Aleksey Ignatenko commented on HARMONY-3462:
--------------------------------------------

Passed smoke.tests on Win IA32 with new_class_registry_v8.patch.

> [dlrvm] new j.l.Class tracing model
> -----------------------------------
>
>                 Key: HARMONY-3462
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3462
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Aleksey Ignatenko
>         Attachments: new_class_registry_v7.patch, new_class_registry_v8.patch
>
>
> The jira introduces new model of j.l.Class referencing into drlvm.
> The current model is:
> all j.l.Classes (JLC) and j.l.Classloaders (JLCL) are enumerated as strong references inside drlvm. It means that all JLC and JLCL are always reachable and we can not track any referencing between classes and classloaders automatically by GC.
> The new model is required by clas unloading (independent of class unloading design). Lets name term "class registry" as -  JLCL refers to its JLC and JLC refer to their defining JLCL (phisically via valid references). This requirement comes from the statement that classloader and all classes loaded by it are to be unloaded at once. e.g. Robin-Salikh approach requires that only JLCL are enumerated then JLC are to be traced automatically by GC (via references in appropriate JLCL - right now there is no direct reference to JLC in JLCL and vice versa). 
> The patch new_class_registry_v7.patch introduces the direct references described above. Also, it changes enumeration model: from now all JLC are traced via JLCL. JLC references are enumerated as weak references now (to be updated by GC).
> Also destination of m_loadedClasses and m_reportedClasses has changed. For now m_loadedClasses is responsible for weak enumeration of all loaded UserDefined j.l.Classes and m_reportedClasses is responsible for enumeration of all bootstrap classes and userdefined classes (untill they are added to class registry)

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