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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-3784) [drlvm][jit][jet] Incorrect support of vmmagic types and object fields in JET compiler
Date Sat, 28 Apr 2007 08:26:15 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Fursov updated HARMONY-3784:
------------------------------------

    Attachment: jet.magics

The fix:
1) JET converts all vmmagic types to int_ptr  and never report it to GC
2) JET  writes magic fields on EM64T platform as int_ptrs



> [drlvm][jit][jet] Incorrect support of vmmagic types and object fields in JET compiler
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3784
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3784
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Mikhail Fursov
>         Attachments: jet.magics
>
>
> VMMagic implementation in JET compiler was initially prototyped but was never actually
used/tested except several particular places in class initializers (DRLVM server mode uses
JET compiler for <clinits>)
> JET has several problems with magic implementation today:
> 1) Magic types are reported to GC. So if GC happend during class initialization DRLVM
will fail
> 2) Magic types are incorrectly stored to fields on EM64T platform with compressed references
mode enabled.
> The only scenario affected today is GCv5 server mode support for EM64T platform where
field of Address type is used.

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