RFR (S): 8000232: NPG: SIGSEGV in Dependencies::DepStream::check_klass_dependency on solaris-x64

Christian Thalinger christian.thalinger at oracle.com
Thu Oct 4 15:48:44 PDT 2012

On Oct 4, 2012, at 3:04 PM, Vladimir Ivanov <vladimir.x.ivanov at oracle.com> wrote:

> http://cr.openjdk.java.net/~vlivanov/8000232/webrev.00
> 22 lines changed: 10 ins; 4 del; 8 mod
> Context type of a dependency is encoded as NULL only when it is explicit and the context is "default" (see Dependencies::ctxk_encoded_as_null). Decoding takes place only in Dependencies::DepStream::context_type(), however the value is used in other places.
> The problem is that no decoding is performed when dependencies are logged using Dependencies::write_dependency_to, but only non-NULL values are expected in the code. The bug existed before NPG, it simply didn't cause a crash.
> Fixed by moving decoding into Dependencies::DepStream::argument, so no caller could see encoded context value (NULL) anymore.

Is this assert still valid then?

   assert(result == NULL || result->is_klass() || result->is_method(), "must be");

-- Chris

> It also improves TraceDependencies & LogCompilation output: dependency context is always correctly displayed.
> Also, did some cleanup.
> Testing: failing test, JPRT w/ logging turned on & off, CTW on solaris_x64.
> Best regards,
> Vladimir Ivanov

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