Re: [rvm-research] Doubts Regarding Jikes Stack Layout for BaseLine Compiler

Hi Pushparaj,

asm.comment(...) performs *compile-time* printing. It can't know the 
run-time value of SP.

To print the run-time value of SP, you can do something like the following:

(1) Create an "instrumentation" method in some class (like 
RuntimeEntrypoints) that will get called from the compiled code:

   @Entrypoint
   static void myInstrumentation(Address value) {
     VM.sysWriteln("Run-time value = ", value);
   }

(2) Add a field to Entrypoints that's a handle to the above 
instrumentation method.

(3) Wherever you're currently modifying the baseline compiler to try to 
print SP, do something like this:

     asm.emitPUSH_Reg(SP);
     genParameterRegisterLoad(asm, 1);
asm.emitCALL_Abs(Magic.getTocPointer().plus(Entrypoints.myInstrumentationMethod.getOffset()));

That'll generate code that calls your instrumentation method at run 
time, with one parameter: the run-time value of SP.

Cheers,
Mike

On 04/19/2013 02:18 PM, Pushparaj Motamari wrote:
> Dear all,
>
> I would like to know how to print the current value of a register . Like
> asm.comment("Text");
> when I try to print asm.comment(SP) ,it is just printing as ESP ..
> when I execute the command ..rvm -X:base:mc=true
>
> Thank You
>
> Pushparaj Motamari
> Instituto Superior Technico -Portugal
>
>
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apps and a phenomenal toolset for data science. Developers can use
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