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invokedynamic now lives in JDK7Posted by forax on April 25, 2009 at 7:11 AM PDT
invokedynamic (at least the main parts) now lives in JDK 7 ! You haven't perhaps notice it but John pushes the first patches from the Da Vinci Machine project to the hotspot workspace.
Method Handle support (meth):
Rémi For early adopters, on Linux you can build the source of the VM by cloning the hotspot workspace, on MacOs X (Intel CPU), Atilla Szegedi gently provides an already built binary. »
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Submitted by opinali on Sat, 2009-04-25 10:05.
Great news. I'm not a dynamic language user myself, but the new runtime support can only make Java better. I suppose invokedynamic and method handles can also be used for more mundane Java programs and APIs, e.g. to optimize dynamic proxies and reflection in general. Don't leave us static-typing bigots out of the party. ;-)
I noticed that JDK 7 build 56 fixes bug 6655638: dynamic languages need method handles, related to the first patch. The bugtrack mentions HotSpot Server only (compiler2), is this wrong?
Submitted by ounos on Sun, 2009-04-26 05:55.
By which java api is this exposed? (or there is none yet?)
Submitted by ounos on Sun, 2009-04-26 05:56.
Oh, never mind, I hadn't clicked the very first link of the post :)
Submitted by forax on Sun, 2009-04-26 06:39.
@4bugzilla, it will.
see http://openjdk.java.net/projects/jdk7/features/
@opinali, I have already a patch for speedup reflection (bug 6824466) but it's based on part of the JSR292 API that aren't already implemented.
I don't see how to change dynamic proxies generation without modifying its API
but it will benefit from reflection speedup.
About the bug category, yes it's wrong it's an umbrella bug, thus not only related to c2.
By the way, I am a static-typing bigot but I am pragmatic too :)
Submitted by 4bugzilla on Sun, 2009-04-26 23:21.
@forax
Actually at http://openjdk.java.net/projects/jdk7/features/ you can see only
--
VM support for non-Java languages (InvokeDynamic)
--
VM support does not mean that there would be a pubic java api for this.
As you can see at
http://blogs.sun.com/jrose/entry/jsr_292_support_in_javac
there is proposal to include necessary java classes but there is no any concrete plans yet.
Submitted by forax on Tue, 2009-04-28 00:40.
@4bugzilla, you're right the API isn't currently integrated because it isn't already freezed. If you are curious, the MethodHandle part of the doc is available here :
http://webrev.invokedynamic.info/jrose/6655638.meth.jdoc/
Just remember that this is a work in progress API :)
Rémi
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