Always enforce ACC_SUPER

[David Holmes]

On 3/05/2013 5:59 PM, Florian Weimer wrote:
> On 05/18/2012 09:49 AM, Florian Weimer wrote:
>> It has been observed that the easy way of creating non-cloneable classes
>> does not work because classes can opt out of the ACC_SUPER handling:
>>
>> <http://mail.openjdk.java.net/pipermail/core-libs-dev/2010-August/004742.html>
>>
>>
>>
>> I don't think this is desirable, so I propose a patch to treat all
>> classes as if they have ACC_SUPER set.  A new product flag is
>> introduced, ForceAccSuper, which defaults to true.  Disabling it
>> preserves the old behavior.  I think that assuming the presence of
>> ACC_SUPER rather than rejecting classes without it completely is safer
>> because non-javac bytecode generators might forget to set ACC_SUPER.
>>
>> The patch is against the Hotspot in OpenJDK 7u4, but it should apply to
>> other versions as well.  It has been tested only lightly (on 7u4 and 8).
>
> It seems that a variant of this patch made its way into jdk7u recently:
> <http://hg.openjdk.java.net/jdk7u/jdk7u/hotspot/rev/db7028c8a953>

Yes it was part of the latest CPU release.

David