[jira] Commented: (HARMONY-5015) [drlvm][jvmti][x86_64] Functions jvmtiGetLocalObject and jvmtiSetLocalObject have to handle compressed references

["Gregory Shimansky (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537405 ] 

Gregory Shimansky commented on HARMONY-5015:
--------------------------------------------

BTW the same algorithm has to be implemented for FieldModification event in jvmti_watch.cpp.  JIT passes jvalue pointer to the new value to the callback. In case of a reference, it has to be uncompressed.

> [drlvm][jvmti][x86_64] Functions jvmtiGetLocalObject and jvmtiSetLocalObject have to handle compressed references
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5015
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5015
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Gregory Shimansky
>            Priority: Minor
>
> Currently these two functions treat references as void* but this isn't true on x86_64 in compressed references mode (currently default). In this mode comparison with NULL has to be done with managed_null, and references have to be uncompressed when taken from JIT stack, compressed when put into JIT stack.

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