for pre-review (M): 6912064: type profiles need to be more thorough for dynamic language support

[Igor Veresov]

John,

If you're going to address the other points in the future, could you 
please also add support for c1-based profiling of these items?

Thanks,
igor

On 12/19/09 12:58 AM, John Rose wrote:
> In order to compile dynamically typed languages, the JVM needs to collect more dynamic typing profile information, and use the information it collects more completely.
>
> Specifically:
>
> - existing profiles on instanceof bytecodes need to be used (they are currently ignored)
>
> - existing profiles on invocation receivers need to be used (they are currently used only in conjunction with inlining optimizations)
>
> - certain type comparisons which appear monomorphic should be compiled to fail on uncommon traps, rather than normal slow path code
>
> - profiles need to be collected on invokedynamic instructions
>
> - profiles should also be collected on selected non-receiver arguments of method calls
>
> This is a preliminary review.  The current webrev addresses only the first and third of the above points:
>
> http://cr.openjdk.java.net/~jrose/6912064/webrev.00/
>
> -- John