RFR(S) 8139164: JVM should throw ClassFormatError for non-void methods named (original) (raw)

Karen Kinnear karen.kinnear at oracle.com
Fri Nov 6 21:54:20 UTC 2015

Harold,

Looks really good. Thank you for working out so carefully what the backward compatibility constraints were and for the extensive testing!

Questions/comments:

  1. Is there a planned change for the old verifier as well?

  2. classFileParser.cpp line 95: mind saying “to disallow argument and require ACC_STATIC for methods”

thanks, Karen

On Oct 26, 2015, at 2:13 PM, Lois Foltan <lois.foltan at oracle.com> wrote:

On 10/26/2015 11:41 AM, harold seigel wrote: Hi Lois,

Thanks for the review. Methods that start with "<" but are not named "" or "" are not legal method names and are detected quite early in class file parsing by function ClassFileParser::verifylegalmethodname(). That allows the subsequent parsing code to know that any method name starting with "<" must be either a class initializer or object initializer._ _Testing for methods whose names start with "<" but are not "" or "" is a distinct issue from this bug and would require its own bug, if need be. Okay, thanks for pointing that out. Looks good. Lois

Thanks, Harold On 10/26/2015 9:15 AM, Lois Foltan wrote: Hi Harold,

I think this looks good. I don't see in any of the tests a test for a bogus internal method named something other than or . Can you locate one if it exists or add one since your change is now checking all methods that start with "<", not just ones that are equal to vmSymbols::objectinitializername(). Would this case pass for class files <= 51? Thanks, Lois On 10/26/2015 8:31 AM, harold seigel wrote: Hi,

Please review this small change to fix bug 8139164. Recent proposed JVM-9 Spec changes (JDK-8130682 <https://bugs.openjdk.java.net/browse/JDK-8130682>) require throwing ClassFormatError exceptions for class file versions >= 51 for methods named that have one or more arguments or are not static. This fix implements that change. Open webrev: http://cr.openjdk.java.net/~hseigel/bug8139164/ JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8139164 The fix was tested with JCK Lang, VM, and API javalang tests, the UTE quick and split verifier tests, and the hotspot, JDK vm, java/io, java/lang, and java/util JTreg tests, and the tests included in this RFR. Thanks, Harold

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