Re: [rvm-research] Instrumentation in baseline compiler

Hi,
Thanks for your prompt response. I want to have the trace of the java
application which is being executed by the jikes rvm, by the trace I mean
all the x86 instructions alongwith the program counter, that will be
executed when the application is running. I have tried to instrument the
emit_opcodes methods in  Assembler.java by modifying Assembler.in and
genAssembler.sh, but I am getting Null Pointer Exceptions when I am
instrumenting some addressing modes. The addressing modes which are causing
problems are Register- Register Index and Immediate,  So I want to ask is
there any special about this addressing modes which I might be missing? And
is there any other way to get the x86 instruction and program counter?


On Sun, Mar 30, 2014 at 7:59 PM, Michael Bond
<[email protected]>wrote:

>  Hi Priyanka,
>
> The baseline compiler already adds instrumentation to count taken vs.
> not-taken branch frequency. Take a look at the EdgeCounts class for a
> starting point. The branch frequencies get passed to the opt compiler (I
> think BranchProfiles is the best place to look?), which also seems to be
> something you want to do.
>
> I hope that helps as a starting point. For follow-up questions, it would
> help if you could provide more details about what you've already
> investigated and what exactly you're trying to do, e.g., should the trace
> of basic blocks be a whole-program path, or do you want to aggregate
> profile information bounded-length paths -- and if so, should they be
> acycle/intraprocedural or something else?
>
> Cheers,
> Mike
>
>
> On 03/28/2014 12:48 PM, Priyanka Bhayana wrote:
>
>  Hi,
>  I am using jikes rvm as research infrastructure. I want to
> instrumentation so as to get the basic blocks frequency as well as the
> trace of basic blocks so that the instructions in the block can be
> rescheduled. I want these trace for baseline compiler.Is there any file in
> jikes source which can be used for this purpose? Can this thing done with
> jikesrvm?
>
> --
>  Thanks&Regards
>   Priyanka
>
>
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-- 
Thanks&Regards
Priyanka

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