[jira] Updated: (HARMONY-3402) [drlvm] j.l.Classloaders for active frames on stack are to be enumerated as strong references

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

     [ https://issues.apache.org/jira/browse/HARMONY-3402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Ignatenko updated HARMONY-3402:
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    Attachment: active_frames_complete_v3.patch

> [drlvm] j.l.Classloaders for active frames on stack are to be enumerated as strong references
> ---------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3402
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3402
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Aleksey Ignatenko
>         Assigned To: Gregory Shimansky
>            Priority: Minor
>         Attachments: active_frames_complete_v2.patch, active_frames_complete_v3.patch, active_frames_force_strong_enum.patch
>
>
> j.l.Classloaders for active frames on stack are to be enumerated as strong references.
> The current model is:
> all j.l.Classloaders and j.l.Classes are enumerated as strong references. According to class unloading discussion in dev list one can see that when there are some functions on stack their j.l.Classes and thus j.l.Classloaders are to be reachable. It is true for interpreter as there is "This" enumerated at every frame, but it is not true for JIT mode because in JIT mode "This" is not specified to be save frame and thus not enumerated (and as a result not reachable).
> The patch attached adds running through functions on stack and forcing j.l.Classloaders (commented for a while) to be enumerated as strong references. The such forcing could be done via boolean flag in class Classloader in drlvm, if some function of class loaded by j.l.Classloader CL1 is on stack then mark it as force to strong enumeration. After that force this CL1 strong enumeration in void ClassLoader::gc_enumerate() function. This issue does not affect class unloading anyhow but it prevents possible serious errors if any class unloading appears at drlvm.

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