Solaris 2.6 JIT generates bad code from optimized java bytecodes

Customer information follows:

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Particulars:

  * Solaris 2.6 beta
  * JDK 1.1.1 for Solaris 2.6

Greetings:

We're in the process of building a simulator for a network of our ATM
switches. The project is 100% Java, and is approximately 20-25%
complete. We have been developing under Solaris 2.5.1, using JDK
release 1.1.1. The software runs properly on this platform as well as
Linux 2.0.18 (JDK 1.1.1).

Recently, we ported the Simulator to the Solaris 2.6 release of JDK
1.1.1 to evaluate, in particular, its performance with the new Just In
Time compiler.

There appears to be a problem with the JIT-enabled VM. Our Simulator
includes a TL1 language analyser generated using SunTest's JavaCC
(both releases 0.6 and 0.7 beta have been used) Parser Generator. With
optimization enabled during compliation, the JIT-enabled VM causes the
parser to prematurely unwind from productions, resulting in
unjustified parse errors.

Running the Simulator under the 2.6 VM with JIT disabled produces
correct results. Also, recompiling with optimization disabled and
running the VM *with* the JIT activated produces correct results.

It appears from my vantage point that the 2.6 JIT compiler is
generating bad code from optimized Java bytecode.

I will be happy to provide more information, including enough code to
build an instance of our TL1 analyser (assuming non-disclosure), if
requested. Thanks.

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