Hi,
There are at least three problems that are still there. They might be
connected, or not.
(I will tell you how to reproduce these at the end)
I just built a new JVM:
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build
1.7.0-internal-olabini_2011_05_25_08_06-b00)
OpenJDK Server VM (build 21.0-b09, mixed mode)
I get that weird missing class error when running my test suite:
java.lang.NoClassDefFoundError: seph/lang/SephObject
java.lang.RuntimeException: java.lang.NoClassDefFoundError:
seph/lang/SephObject
at seph.lang.Runtime.evaluateStream(Runtime.java:132)
at seph.lang.Runtime.evaluateString(Runtime.java:146)
at
seph.lang.code.BasicSanityTest.recursive_odd_and_even_that_should_blow_the_stack(BasicSanityTest.java:214)
Caused by: java.lang.NoClassDefFoundError: seph/lang/SephObject
at java.lang.invoke.MethodHandle.invokeExact(MethodHandle.java)
at java.lang.invoke.MethodHandle.invokeExact(MethodHandle.java)
at seph$gen$abstraction$41$even?.argument_0_0(<eval>:7)
at seph.lang.compiler.Bootstrap.intrinsic_if(Bootstrap.java:654)
at seph$gen$abstraction$41$even?.even?(<eval>:7)
at seph$gen$abstraction$39$toplevel.toplevel(<eval>:25)
at seph.lang.Runtime.evaluateStream(Runtime.java:125)
This is obviously a complete blocker.
Turning off the ricochet frames hits an NYI error when running the test
suite.
I'm still seeing a crash in ricochet frames:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGBUS (0xa) at pc=0x0104884f, pid=85043, tid=2953850880
#
# JRE version: 7.0
# Java VM: OpenJDK Client VM (21.0-b09 mixed mode bsd-x86 )
# Problematic frame:
# V [libjvm.dylib+0x4884f] MethodHandles::ricochet_frame_oops_do(frame
const&, OopClosure*, RegisterMap const*)+0x12f
#
# Failed to write core dump. Core dumps have been disabled. To enable
core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /Users/olabini/workspace/seph/hs_err_pid85043.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
I've attached the error file.
The third error (in frame.cpp) only happens on master of seph, but there
are some other problems with master that means you get lots of weird output.
In order to reproduce problem 1 and 2:
git clone git://github.com/seph-lang/seph.git
git checkout 9075c0f4ffe1adac0657057aee2193f16ad12a43
(build.xml: remove lines with <jvmarg value="-Xint"/>)
problem 1:
ant
This should show you one entry of the missing class problem
problem 2:
ant jar-notest
bin/seph bench/bench_arithmetic.sp
This should show you problem 2.
If you for reference want to see the benchmark run correctly, do
bin/seph -J-Xint bench/bench_arithmetic.sp
problem 3:
git checkout master
git checkout 99c8f2609d468835390e39b68c73f21cc78e5ab5
ant clean jar-notest
bin/seph bench/bench_arithmetic.sp
This should show you problem 3. You will also see loads of other
exceptions, since that point generates slightly bad bytecode. That
shouldn't make the JVM crash though, I assume - and I've seen the
frame.cpp should not reach here without seeing those exceptions.
All of these require that JAVA_HOME points to the Java 7 you want to use
Cheers
>
> tom
>
> On May 23, 2011, at 7:33 PM, Ola Bini wrote:
>
>> Hi,
>>
>> I'm happy to see that the performance degradation is getting
>> addressed. I would like to point out that there is still a serious
>> crash in the machinery too... Have you seen any reason why that
>> happens?
>>
>> Cheers
>>
>>
>> On 2011-05-24 06.11, John Rose wrote:
>>> On May 23, 2011, at 3:44 PM, Tom Rodriguez wrote:
>>>
>>>>> I'd *love* for intermediate static Java snippits like this
>>>>> to inline straight through, even if invokeExact would be
>>>>> megamorphic under normal circumstances...but I don't think
>>>>> that's the case right now, right?
>>>>
>>>> I haven't been following 292 that closely but it used to be a
>>>> piece of code that did precisely that.
>>>>
>>>> + private Object invoke_L0() throws Throwable { + if
>>>> ((boolean) test.invokeExact()) + return
>>>> target.invokeExact(); + return
>>>> fallback.invokeExact(); + }
>>>>
>>>> It looks like it was reworked at some point to use
>>>> selectAlternative but the optimizer was never updated to deal
>>>> with it properly. It's not particularly hard, we just need to
>>>> generate code like we would for a bimorphic call site. The
>>>> current code expects to either get a constant or something else
>>>> and doesn't inline if it's something else. In this case we
>>>> have a Phi of two constants which we just need to split.
>>>
>>> Yes, it would be a quasi-bimorphic call site keyed from a phi of
>>> two constants, instead of a profile of two receiver classes.
>>>
>>>> I'm still unclear why you couldn't write your own variant of
>>>> guardWithTest and have it work but my knowledge of what's
>>>> really allowed is somewhat limited.
>>>
>>> Those snippets will inline (I think), but at some point Charlie
>>> will want to fetch a bit of constant stuff out of an instance
>>> variable. That will look non-constant to the optimizer, even if
>>> the instance variable is final and the enclosing object is a
>>> constant reference. We made sure this happens for
>>> java.lang.invoke classes, but we haven't extended it yet to user
>>> code, in part because it would have its own bug tail to work
>>> through.
>>>
>>> -- John _______________________________________________ mlvm-dev
>>> mailing list mlvm-dev at openjdk.java.net
>>> http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
>>>
>>
>>
>> -- Ola Bini (http://olabini.com) Ioke - JRuby - ThoughtWorks
>>
>> "Yields falsehood when quined" yields falsehood when quined.
>>
>> _______________________________________________ mlvm-dev mailing
>> list mlvm-dev at openjdk.java.net
>> http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
>
> _______________________________________________ mlvm-dev mailing
> list mlvm-dev at openjdk.java.net
> http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
>
--
Ola Bini (http://olabini.com)
Ioke - JRuby - ThoughtWorks
"Yields falsehood when quined" yields falsehood when quined.
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