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

[Doerr, Martin]

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/

Patch successfully ran through a substantial amount of tests with enabled "can_access_local_variables". Please review.

Best regards,
Martin

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/attachments/20181127/4ef37cfb/attachment.html>