RFR(S): 8026407: VM is crashed on linux-ppc and linux-i586 when there is not enough ReservedCodeCacheSize specified

[Albert Noll]

Hi all,

I worked on this bug for some time but so far I was not able to 
determine its root cause.
However, I have found a work around that hides the problem. Since it is 
important
for the embedded version of hotspot to work with small code cache sizes 
+ nashorn,
I would suggest to apply this workaround, and file another bug that 
investigates the problem
(e.g., a P4) that we can defer.

bug: https://bugs.openjdk.java.net/browse/JDK-8026407
webrev: http://cr.openjdk.java.net/~anoll/8026407/webrev.00/ 
<http://cr.openjdk.java.net/%7Eanoll/8026407/webrev.00/>

problem: If we do not create native wrapper for method handle 
intrinsics, we get
                segfaults in compiled code. Also, if 
-XX:VerifyAdapterCalls is enabled, we
                get:

                assert(false) failed: DEBUG MESSAGE: i2c adapter must 
return to an interpreter frame

                The bug seems to be specific to method handle 
intrinsics. I assume that we either call
                the wrong entry point to a compiled method, or there is 
a bug somewhere in the generated
                adapters. Method handle intrinsics are treated 
specifically in various parts of the code and
                I do not yet really understand everything.

solution: As mentioned above, the solution is a workaround and does not 
solve the real problem.
               Nevertheless it improves stability of hotspot and the 
impact of the proposed changes are
               marginal.

testing: Running nashorn with small code cache size (3m) on PPC and x86

There will be a separate mail for closed part changes.

Many thanks in advance,
Albert

P.S.: If anyone has an idea of where the problem could be, please let me 
know!
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