Substitution

[Krystal Mok]

Hi Dean & Nils,

My guesses:

How about the other way around:
1. make a copy of java/lang/Integer.java, modify its valueOf()
implementation to simply call the constructor; add the resulting class file
to -Xbootclasspath/p
2. run the tests with -XX:-EliminateAutoBox

Another solution, targeting C2 only, could be: make a new case to cover
vmIntrinsics::_Integer_valueOf in LibraryCallKit::try_to_inline(), and
substitute the call to Integer.valueOf() with an allocation/constructor
call.

- Kris

On Thu, Mar 8, 2012 at 1:47 AM, Dean Long <dean.long at oracle.com> wrote:

>  I thought hotspot had an "API hiding" mechanism that used bytecode
> rewriting of method calls, but I can't seem to find it in the code, just
> references to it on the wiki.
>
> dl
>
> On 3/7/2012 5:33 AM, Nils Eliasson wrote:
>
> Hi all,
>
> Are there any mechanism present for method substitution?
>
> I would like to do a runtime substitution of all calls to Integer.valueOf
> to the Integer constructor. I am doing some experiments on boxing
> elimination and are trying to get a number on how much problem the Integer
> cache is causing.
>
> //N
>
>
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