RFR:JDK-8190391:nashorn: "!!" of nonzero even integer var becomes false when returned

[Sundararajan Athijegannathan]

+1

Yep. 0 and 1 are only allowed.

-Sundar

On 13/11/17, 1:27 PM, Attila Szegedi wrote:
> +1. Nice catch. Feels like an implementation detail, but the JVM
> specification is indeed unclear on the behavior in case there's a bytecode
> method doing this:
>
> public static func(I)Z
>      0     iload 0
>      1     ireturn
>
>
> I went spelunking in the JVM spec, and the closest I could find is in
> section 2.3.4 says "The Java Virtual Machine encodes boolean array
> components using 1 to represent true and 0 to represent false. Where Java
> programming language boolean values are mapped by compilers to values of
> Java Virtual Machine type int, the compilers must use the same encoding."
> So I guess we better stick to that.
>
> Attila.
>
>
> On Mon, Nov 13, 2017 at 7:21 AM, Priya Lakshmi Muthuswamy<
> priya.lakshmi.muthuswamy at oracle.com>  wrote:
>
>> Hi,
>>
>> Please review JDK-8190391 : nashorn: "!!" of nonzero even integer var
>> becomes false when returned
>>
>> JBS : https://bugs.openjdk.java.net/browse/JDK-8190391
>> webrev : http://cr.openjdk.java.net/~pmuthuswamy/8190391/webrev.00/
>>
>> Thanks,
>> Priya
>>