[JDK8] RFR (XS): JSR292: IncompatibleClassChangeError in LambdaForm for CharSequence.toString() method handle type converter

Jochen Theodorou blackdrag at gmx.org
Thu Jan 16 08:40:32 UTC 2014


since I am indirectly the reporter of this bug I have one remark for the 
test. The error happens only for compiled lambda forms. The given test 
does imho not use a compiled lambda form. In other words, afaik the test 
would pass without the fix. As such it would be useless as regression test.

Am 15.01.2014 16:31, schrieb Vladimir Ivanov:
> http://cr.openjdk.java.net/~vlivanov/8031502/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8031502
> InvokeBytecodeGenerator can produce incorrect bytecode for a LambdaForm
> when invoking a method from Object declared in an interface.
> The problem is the following:
>     (1) java.lang.CharSequence interface declares abstract method "String
> toString()";
>     (2) after 8014013 fix, VM resolves
> CharSequence::toString()/invokeInterface to
> CharSequence::toString()/invokeVirtual;
>     (3) during LambdaForm compilation, CharSequence is considered
> statically invocable (see
> InvokeBytecodeGenerator::isStaticallyInvocable) and invokevirtual for
> CharSequence::toString() is issued, which is wrong (invokevirtual throws
> ICCE if it references an interface);
> The fix is straightforward: during LambdaForm compilation, switch back
> from invokevirtual to invokeinterface instruction when invoking a method
> on an interface.
> The fix is targeted for 8. Will be also integrated into 9.
> Testing: regression test, jdk/test/java/lang/invoke, vm.mlvm.testlist,
> nashorn, jruby.
> Thanks!
> Best regards,
> Vladimir Ivanov
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> mlvm-dev at openjdk.java.net
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Jochen "blackdrag" Theodorou - Groovy Project Tech Lead
blog: http://blackdragsview.blogspot.com/
german groovy discussion newsgroup: de.comp.lang.misc
For Groovy programming sources visit http://groovy-lang.org

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