Question about redirecting a compilation

[Vladimir Kozlov]

I see. You can't use that mechanism if method can go into safepoint.

You can add java wrapper method to make sure we compile caller so case 
1. will be enough, at least for your experiment.

An other approach. We have StackWalkCompPolicy old code (we don't use it 
anymore) in compilationPolicy.cpp which try to compile caller first. You 
can try to adapt it for this method.

Vladimir

On 1/2/13 12:35 PM, Deneau, Tom wrote:
> Vladimir --
>
> I saw that special case code for Reference_get and tried to do the same for my case.
> The native routine in my case is not a leaf, and I hit a problem when it was trying to use GraphKit::add_safepoint_edges,
> It seems there was no _method defined in the jvms.
>
> Here is the relevant part of the stack.
>
> #5  0x00007ffff6d66c7e in JVMState::method (this=0x7ffff02f4e18) at src/share/vm/opto/callnode.hpp:252
> #6  0x00007ffff7090a21 in should_reexecute_implied_by_bytecode (jvms=0x7ffff02f4e18, is_anewarray=false) at src/share/vm/opto/graphKit.cpp:810
> #7  0x00007ffff7090c8d in GraphKit::add_safepoint_edges (this=0x7fffd49a9ce0, call=0x7fffb0149c48, must_throw=false) at src/share/vm/opto/graphKit.cpp:877
> #8  0x00007ffff70958d5 in GraphKit::make_runtime_call (this=0x7fffd49a9ce0, flags=5, call_type=0x7ffff0265488,
>
> -- Tom
>
> Date: Wed, 02 Jan 2013 10:35:21 -0800
> From: Vladimir Kozlov <vladimir.kozlov at oracle.com>
> Subject: Re: Question about redirecting a compilation
> To: sumatra-dev at openjdk.java.net
> Message-ID: <50E47DE9.2010506 at oracle.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> May be I don't understand your question but C2 can compile top method into intrinsic (it does not need to be called from compiled method).
> Look on code for vmIntrinsics::_Reference_get in compile.cpp.
>
> Vladimir
>
> On 1/2/13 9:40 AM, Deneau, Tom wrote:
>> As part of an experiment we'd like some Java code, say method Foo() to
>> get redirected to some native code when either
>>
>> 1.     the caller of Foo() gets compiled by C2
>>
>> 2.     or Foo() itself gets compiled by C2.
>>
>> I know how to do Bullet 1 above by defining Foo as an intrinsic but what is the best way to do #2?
>>
>> -- Tom
>>
>>
>>
>
>
>