RFR(XXS): 8039348: -XX:+TraceDeoptimization -XX:+Verbose -Xcomp can crash VM

[Markus Grönlund]

Yes. The java/lang/String object is not NULL but it's [C field is.

 

In the local/expression slots output, there is an object there, it's not NULL, it's being created.

 

/Markus

 

From: Staffan Larsen 
Sent: den 6 april 2014 20:24
To: Markus Grönlund
Cc: serviceability-dev at openjdk.net; hotspot-runtime-dev at openjdk.java.net
Subject: Re: RFR(XXS): 8039348: -XX:+TraceDeoptimization -XX:+Verbose -Xcomp can crash VM

 

You have changed the output when the 'value' field is not set from NULL to "". Was this intentional?

 

/Staffan

 

On 6 apr 2014, at 19:05, Markus Grönlund <HYPERLINK "mailto:markus.gronlund at oracle.com"markus.gronlund at oracle.com> wrote:





Greetings,

 

Kindly asking for reviews for this small fix:

 

Bug: https://bugs.openjdk.java.net/browse/JDK-8039348

Webrev: http://cr.openjdk.java.net/~mgronlun/8039348/webrev01/

 

Found when debugging:

-XX:+TraceDeoptimization -XX:+Verbose -Xcomp

 

Using -Xcomp can cause an uncommon trap in java/lang/String constructors before the [C value field has been assigned.

 

Thanks

Markus

 
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