8005817: Shark: implement deoptimization support [Was: Re: RFR: Implement deoptimization support in Shark]

[Christian Thalinger]

8005817: Shark: implement deoptimization support

On Dec 6, 2012, at 12:43 PM, Roman Kennke <rkennke at redhat.com> wrote:

> This change implements support for method deoptimization in Shark, and
> thus (re-) enables an optimization for potentially inlining virtual
> methods.
> 
> http://cr.openjdk.java.net/~rkennke/shark-deopt/webrev.01/
> 
> This optimization has been enabled before, a while ago, but has been
> disabled because it leads to segmentation faults:
> 
> http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=481
> 
> I used the testcase in the above bugreport (one of the jtreg tests in
> jdk) to verify that the change does indeed deoptimize (and re-compile)
> methods correctly. Besides that, no regressions could be found in
> hotspot/test/compiler (and a bunch of other tests and programs I've been
> running, including SpecJVM, Eclipse, etc).
> 
> Ok to go in?
> 
> Cheers,
> Roman
> 
>