Just out of curiosity, in what situation would you need to have an invokedynamic vs. invokespecial call to super <init>? Need invocation time overloaded constructor resolution?
Attila. 2012.06.26. dátummal, 12:37 időpontban Jochen Theodorou <blackd...@gmx.org> írta: > Am 26.06.2012 11:59, schrieb Rémi Forax: >> On 06/26/2012 11:40 AM, Jochen Theodorou wrote: >>> Hi all, >>> >>> just to be sure I understand correctly... afaik there are two things >>> invokedynamic cannot do. >>> >>> (1) calling private methods >>> actually I am not sure this is really true. There is a Lookup instance I >>> can use to get handles to private methods (afaik), therefore it should >>> be possible. Or is there an artificial restriction of some kind? >> >> No restriction, or you need a way to get the proper lookup >> or you use reflection to get a j.l.r.Method, call setAccessible(true) >> and unreflect it as a MethodHandle (see MethodHandles.unreflect*). > > ok, so I can remove those stupid helper methods ;) > >>> (2) calling super() >>> afaik I cannot generate a call site that replaces the invokeSpecial call >>> to a super class constructor. >> >> You can call super.foo() > > ah true... this is not reflection.. even if I get the handle from the > super class it won't call the overriding method in the current class. I > totally forgot... how do you handle this in your backport? > >> but not super(). >> It's because the VM verifies that you should not have access to an >> uninitialized object, ie. access to an object before calling super(). >> So if you do a super() using a MethodHandle, because it's hidden >> by an invokedynamic (or a constant method handle) the VM as no >> way to know that this invokedynamic will call the constructor >> of the super class, so the verifier will not let you call invokedynamic >> on this in a constructor without calling explicitly super() before. > > I see... that is a bit unfortunate. I have to do quite some tricks to > enable the super constructor call according to Groovy rules for method > dispatch. And what I do I won't call fast. > > bye blackdrag > > -- > Jochen "blackdrag" Theodorou - Groovy Project Tech Lead > blog: http://blackdragsview.blogspot.com/ > german groovy discussion newsgroup: de.comp.lang.misc > For Groovy programming sources visit http://groovy-lang.org > > > > _______________________________________________ > mlvm-dev mailing list > mlvm-dev@openjdk.java.net > http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
