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From "Gregory Shimansky (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-1826) [drlvm][jvmti] Fix JVMTI support
Date Tue, 17 Oct 2006 11:02:37 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-1826?page=comments#action_12442864 ] 
            
Gregory Shimansky commented on HARMONY-1826:
--------------------------------------------

I've found the reason of this problem. The infinite SIGSEGV happens because get_stack_addr
cannot get TLS pointer to vm_thread structure. It is necessary to get JNI env. This JNI environment
is used in JVMTI process_jvmti_event which is called to signal JVMTI that thread finished.
The call is done in invocation API DetachCurrentThread.

The fix is trivial, DetachCurrentThread should call jvmti_send_thread_start_end_even *before*
calling jthread_detach. The TLS data will be ok in this condition. After jthread_detach TLS
data is absent so nothing can be found, that's the reason for the crash.

> [drlvm][jvmti] Fix JVMTI support
> --------------------------------
>
>                 Key: HARMONY-1826
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1826
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Pavel Rebriy
>         Assigned To: Geir Magnusson Jr
>         Attachments: Fix JVMTI support.patch, Fix JVMTI support.patch, Fix-JVMTI-support.patch
>
>
> The issue contains the following fixes:
> -	Fixed JVMTI initialization and execution mode
> -	Fixed JNIEnv usage for interpreter
> -	Removed jni_native_env from global namespace
> -	Fixed Single Step event disabling

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