RFR(S): 8214352: C1: Unnecessary "compilation bailout: block join failed" with JVMTI

[Doerr, Martin]

Hi Vladimir,

thanks for reviewing. I hope a C1 expert can find some time to take a look.

Best regards,
Martin


-----Original Message-----
From: hotspot-compiler-dev <hotspot-compiler-dev-bounces at openjdk.java.net> On Behalf Of Vladimir Kozlov
Sent: Sonntag, 2. Dezember 2018 01:50
To: hotspot-compiler-dev at openjdk.java.net
Subject: Re: RFR(S): 8214352: C1: Unnecessary "compilation bailout: block join failed" with JVMTI

Seems fine to me but I am not C1 expert.

Regards,
Vladimir

On 11/27/18 3:03 AM, Doerr, Martin wrote:
> Hi,
> 
> C1 currently bails out when a local value is derived from a Phi with different types.
> 
> According to comments, this case is supposed to be very rare, but it's not so rare when a JVMTI agent is used 
> (capability "can_access_local_variables").
> 
> I'd like to fix this.
> 
> Issue with more detailed description:
> 
> https://bugs.openjdk.java.net/browse/JDK-8214352
> 
> Webrev:
> 
> http://cr.openjdk.java.net/~mdoerr/8214352_c1_phi/webrev.00/ 
> <http://cr.openjdk.java.net/%7Emdoerr/8214352_c1_phi/webrev.00/>
> 
> Patch successfully ran through a substantial amount of tests with enabled "can_access_local_variables". Please review.
> 
> Best regards,
> 
> Martin
>