RFR (S) 8043224: -Xcheck:jni improvements to exception checking and excessive local refs

harold seigel harold.seigel at oracle.com
Thu May 15 13:26:53 UTC 2014

Hi David,

Did you mean 'noof' or 'number of' here?

+      tty->print_cr("WARNING: JNI local refs: %zu, exceeds nof planned: %zu",

Thanks, Harold

On 5/15/2014 7:55 AM, David Simms wrote:
> Bug: https://bugs.openjdk.java.net/browse/JDK-8043224
> Web review: http://cr.openjdk.java.net/~dsimms/8043224/
> Check JNI:
> 1) Functions that require exception checks now set a flag. JNI 
> exception checks clear said flag. Functions which do not allow 
> exceptions now check the flag and warn if the programmer has failed to 
> check for exceptions. Said flag is actually the name of the function 
> requiring an exception check.
> 2) JNI function exit now check and warn if the number of local 
> reference exceed the "planned number of references", i.e exceed 
> initial frame capacity, "pushlocalframe" capacity or 
> "ensurelocalcapacity".
> Testing:
>  * jtreg, quick vm tests
>  * Hand rolled test run locally (no support of JNI in test libs...will
>    hold until there is support).
> Cheers
> /David Simms

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