RFR(S) 8149607: [Verifier] Do not verify pop, pop2, swap, dup* against top

harold seigel harold.seigel at oracle.com
Fri Sep 9 15:25:52 UTC 2016

Hi Dmitry,

I used version 51 in case this fix ever gets backported to JDK 8 or JDK 
7.  Since versions 51, 52, and 53 all use the same verifier, I don't see 
a need for using different versions.

Thanks, Harold

On 9/9/2016 11:23 AM, Dmitry Dmitriev wrote:
> Hello Harold,
> Small question about the test. All classes in popDupSwapTests.jasm 
> have "version 51:0". Is it make sense to use different versions 
> including the last one? Thank you!
> Dmitry
> On 31.08.2016 21:21, harold seigel wrote:
>> Hi,
>> Please review this verifier fix to disallow popping a single operand 
>> of type 'top' from the stack in case it's the upper half of a long or 
>> double operand.  See the Java Virtual Machine Spec 
>> <http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-> 
>> for information about type 'top' operands.
>> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8149607
>> Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8149607/
>> The fix was tested with the JCK Lang and VM tests, the hotpot, and 
>> java/lang, java/util and other JTreg tests, and the NSK colocated and 
>> non-colocated quick tests.
>> Thanks, Harold

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