Debugging Graal-enabled OpenJDK

[Vitaly Davidovich]

On Monday, October 3, 2016, Tom Rodriguez <tom.rodriguez at oracle.com> wrote:

>
> > On Oct 3, 2016, at 9:46 AM, Andrew Haley <aph at redhat.com <javascript:;>>
> wrote:
> >
> > I'm trying to follow the instructions at
> > https://github.com/graalvm/graal-core/blob/master/docs/Debugging.md
> >
> > My problem is that none of the Graal classes seem to be loaded but
> > compilation is still happening.  I see:
>
> I looks like it just hasn’t triggered a level 4 compile which is where
> graal runs.  Turn off tiered compilation or run something that makes the VM
> work harder.  Also -XX:+BootstrapJVMCI will forcibly exercise Graal before
> the VM starts up and warm up the compiles needed by Graal as well.

Tom,

Any reason BootstrapJVMCI isn't enabled by default? Seems like the
safer/common option is to have that bootstrap early so any issues will be
discovered before the app is fully online.  Discovering problems at some
later point in time seems problematic (as the default choice).

>
> tom
>
> >
> > mx -d vm -XX:+UseJVMCICompiler  -cp ~ -XX:+PrintCompilation Hello
> > Listening for transport dt_socket at address: 8000
> >   7142    1       3       java.lang.String::hashCode (55 bytes)
> >   7144    2       3       java.lang.String::charAt (29 bytes)
> >   7145    3       3       java.lang.String::length (6 bytes)
> >   7145    4       3       java.lang.String::indexOf (70 bytes)
> >   7145    5     n 0       java.lang.System::arraycopy (native)   (static)
> >   7145    8       3       java.lang.Object::<init> (1 bytes)
> >   7145    7       3       java.lang.Math::min (11 bytes)
> >   7145    6       1       java.lang.ref.Reference::get (5 bytes)
> >   7145    9       3       java.lang.String::equals (81 bytes)
> >   7145   10       1       java.lang.ThreadLocal::access$400 (5 bytes)
> >
> > This looks like the usual C1 compilation.  If I use -verbose:class
> > no Graal classes are listed.
> >
> > So what do I have to do in order to make the JVM use Graal, so that
> > I can debug it?
> >
> > Andrew.
>
>

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