Inlining primitive targets?

[Chanwit Kaewkasi]

Hi all,
I just would like to see if the Hotspot is possible to inline this call site:

  InvokeDynamic.<Object>"plus"(Object, Object)

with this target:

  public static final int plus(int, int) {
    return a + b;
  }

I tested calling InvokeDynamic.<int>"plus"(Object, Object) with the above target
and it is running fine, although it's not inlined. C2 was trying to
inline it, but it failed.
See the log here [1].

Then, I tested calling InvokeDynamic.<Object>"plus"(Object, Object)
also with the above target.
This time I used the Fibonacci program, and JVM crashed. Although it
crashed, the inlining
information is really interesting to me. You cal see the full log from [2].

[Stub Code]
  0xb3e78b00: jmp	0xb3e76e60      ;   {no_reloc}
  0xb3e78b05: push	0xb3e78b05      ;   {section_word}
  0xb3e78b0a: jmp	0xb3e4eb80      ;   {runtime_call}
[Constants]
  0xb3e78b0f: int3
          @ 11   java.dyn.MethodHandle::invoke  native method
          @ 14   sun.dyn.FromGeneric$Adapter::convert_I  inline (hot)
          sun.dyn.FromGeneric$A2::invoke_I2 -> @ 14
sun.dyn.FromGeneric$Adapter::convert_I  >>TypeProfile (32782/32782
counts) = sun/dyn/FromGeneric$A2 (9 bytes)
            @ 5   java.dyn.MethodHandle::invoke  native method
        @ 33   java.dyn.MethodHandle::invoke  native method
        @ 33   g7.tests.classgen.Fib::fib  inline (hot)
          @ 2   java.lang.Integer::valueOf  inline (hot)
          @ 5   java.dyn.MethodHandle::invoke  native method
          @ 5   com.chanwit.g7.runtime.DefaultNumberMethods::__lt__
inline (hot)
            @ 1   java.lang.Integer::intValue  inline (hot)
            @ 5   java.lang.Integer::intValue  inline (hot)
            @ 16   java.lang.Boolean::valueOf  inline (hot)
          @ 13   java.lang.Boolean::booleanValue  inline (hot)
          @ 25   java.lang.Integer::valueOf  inline (hot)
          @ 28   java.dyn.MethodHandle::invoke  native method
          @ 28   sun.dyn.FromGeneric$A2::invoke_I2  inline (hot)
            @ 11   java.dyn.MethodHandle::invoke  native method
            @ 14   sun.dyn.FromGeneric$Adapter::convert_I  inline (hot)
            sun.dyn.FromGeneric$A2::invoke_I2 -> @ 14
sun.dyn.FromGeneric$Adapter::convert_I  >>TypeProfile (32782/32782
counts) = sun/dyn/FromGeneric$A2 (9 bytes)
              @ 5   java.dyn.MethodHandle::invoke  native method
          @ 33   java.dyn.MethodHandle::invoke  native method
          @ 33   g7.tests.classgen.Fib::fib  recursively inlining too deep
          @ 40   java.lang.Integer::valueOf  inline (hot)
          @ 43   java.dyn.MethodHandle::invoke  native method
          @ 43   sun.dyn.FromGeneric$A2::invoke_I2  inline (hot)

So my questions are (sorry if they look very newbie-ish):

I think in several cases, we need binary operators to be primitives.
So is it possible to by-pass this call sun.dyn.FromGeneric$A2::invoke_I2 ?
Or is it possible to have a call like
sun.dyn.FromGeneric$A2::invoke_I2, but with (II)I.

BTW, as the last time the target (Integer, Integer)Integer is
successfully inlined,
If I would like to do a simple boxing/unboxing pairs removal on
generated assembly codes,
which part of C2 can I start looking at?

Best regards,

Chanwit

[1] http://files.getdropbox.com/u/381580/mlvm/int_inlined.dump
[2] http://files.getdropbox.com/u/381580/mlvm/fib_inliing_00.dump

-- 
Chanwit Kaewkasi
PhD Candidate,
Centre for Novel Computing
School of Computer Science
The University of Manchester
Oxford Road
Manchester
M13 9PL, UK