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From "Alexey Varlamov" <alexey.v.varla...@gmail.com>
Subject [drlvm] Non-bug difference HARMONY-1688?
Date Mon, 09 Oct 2006 10:16:33 GMT

Would you mind to spend some time looking at HARMONY-1688? Good
knowledge of classloading and security machinery is an advantage :)

In short, we face 2 issues in DRLVM:
1) DRLVM itself is not aware of classes initiated (in contrast to
defined ones) by a loader, and always delegates to Java classes for
lookup (except bootstrap loader, of course). This is not really queer
behaviour, but seems incompartible with most VMs. BTW, currently this
affects implementation of jvmtiGetClassLoaderClasses(), which I
believe has a bug - it returns defined classes only.
2) j.s.AccessController of DRLVM treats system classes (i.e. loaded by
bootstrap loader) equally with application classes while examining
execution stack, while RI seems to be simply skipping them. In other
words, DRLVM would always perform ProtectionDomain.checkPermission()
with AllPermission for bootstrap classes, and RI will omit such check
if no user classes on stack. This potentially may produce subtle
effects in security-exigent areas.

Also, both can be considered from performance perspective, probably
having somewhat negative impact.
What do you think, how will we resolve this?

[0] http://issues.apache.org/jira/browse/HARMONY-1688

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