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From "Pavel Pervov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5464) [drlvm] vm helper improvement for better performance
Date Thu, 07 Feb 2008 09:37:08 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566519#action_12566519
] 

Pavel Pervov commented on HARMONY-5464:
---------------------------------------

Ok, now I see that.

Re (2): we actually use NULL as the base for interface vtable and then address the method
relative to that NULL. May it happen that the referenced address belongs to readable area?..

> [drlvm] vm helper improvement for better performance
> ----------------------------------------------------
>
>                 Key: HARMONY-5464
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5464
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: Hope it works everywhere
>            Reporter: Maksim Ananjev
>            Assignee: Alexey Varlamov
>            Priority: Minor
>         Attachments: HARMONY_5464.patch
>
>
> The issue deals with "load interface vtable support".  Returning zero address and not
generating NPE if the object is null is safe in terms of preserving program semantics(the
exception will be generatedon the first method invocation) and allows profitable code transformations
such as hoisting vm helper outside the loop body. This is our current convention which touches
all variants of this helper. If it changes, all variants must be fixed
> The patch also includes osr_path enabling because it depends on this feature.

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