Instrument at marked locations

Hi all,
I want to use ASM to instrument program at certain marked locations.
For example, in my original program, I might have
...
somecode
//@trace:  int x, int y, int z
some more code
...

I want to use ASM to instrument code at the trace locations,
...
somecode
System.out.printf("trace: %d %d %d\n, x,y,z);
some more code
...

But I am not sure how I would "mark" the locations so that ASM can see
them.  I cannot use comments as above, e.g., //@trace, because they are not
kept in the bytecode. I am thinking about using annotation but not sure how
that would work.  A potential solution is actually introducing some trace
method and instead of @trace I would call trace(x,y,z);   But I want to
avoid this.

Any suggestions ?

Thanks,


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