Can't get lambda forest to work

[Andrew Haley]

On 06/14/2010 05:39 PM, Andrew Haley wrote:
> On 06/14/2010 05:28 PM, Maurizio Cimadamore wrote:
>> I tried launching the 'java' launcher from a recently built lambda repo; 
>> I added the options:
>>
>> -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles
>> -XX:+EnableInvokeDynamic
>>
>>
>> and that seemed to work, at least it did for me. I noticed you are using 
>> a 64-bit setting, while I'm on 32-bit, could that be the issue?
> 
> Maybe.  I'm just going to step through the VM in a debugger and have a look.
> I'll let you know what I find.  :-)

OK, I found.  The VM is looking for java_dyn_CallSite.target
in java_dyn_CallSite::compute_offsets()

in the Lambda forest, this field is commented out:

    /*

    // Fields used only by the JVM.  Do not use or change.
    private Object vmmethod;
    int callerMID, callerBCI;  // supplied by the JVM

    private MethodHandle target;

    final Object caller;  // usually a class
    final String name;
    final MethodType type;
    */

but this code was commented out in this change:

user:        jrose
date:        Thu Jan 07 16:16:45 2010 -0800
summary:     6914665: update jdk code for JSR 292 (post 6858164)

Cc'ing hotspot-dev in the hope of enlightenment...

Andrew.