SlideShare wird heruntergeladen. ×
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Invoke Dynamic
Nächste SlideShare
Wird geladen in ...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Invoke Dynamic

2,793

Published on

Published in: Technologie, Bildung
0 Kommentare
2 Gefällt mir
Statistiken
Notizen
  • Hinterlassen Sie den ersten Kommentar

Keine Downloads
Views
Gesamtviews
2,793
Bei Slideshare
0
Aus Einbettungen
0
Anzahl an Einbettungen
1
Aktionen
Geteilt
0
Downloads
36
Kommentare
0
Gefällt mir
2
Einbettungen 0
No embeds

Inhalte melden
Als unangemessen gemeldet Als unangemessen melden
Als unangemessen melden

Wählen Sie Ihren Grund, warum Sie diese Präsentation als unangemessen melden.

Löschen
No notes for slide

Transcript

  • 1. InvokeDynamicJava 7 dynamically typed language support arkadi.shishlov@gmail.com
  • 2. Statically typed languages Java Scala C# C C++ F# Haskel
  • 3. Dynamic languagesGroovyClojureJavaScriptPerlPythonRubyPHP
  • 4. Dynamic languageobject runtime alteration (open program code)metaobject protocolevalfunctional programming, closures, macros
  • 5. Dynamically typed languagetype checking performed at runtimevariable does not have a typevalue is associated with a typeduck typing
  • 6. The program must be compiledto bytecode to achieve Javalevel performance
  • 7. Use casegroovy:000> f = { it + it }===> groovysh_evaluate$_run_closure1@dc737begroovy:000> f(1)===> 2groovy:000> f("qw")===> qwqwgroovy:000> [2, "qwe"].collect(f)===> [4, qweqwe]groovy:000>
  • 8. collect (list, func) { foreach (list) push (result, func (it))}
  • 9. The probleminvokevirtual some/class/Name.func(Ljava/lang/String)Z, objectref, arg1, arg2, ...invokespecialinvokestatic has similar calling conventioninvokeinterface
  • 10. The solution Reflection is (relatively) slow There are others possibilities
  • 11. Java 7 approach - JSR292invokedynamic (indy) boostrapFuncRef, NameLiteral(Lorg/jruby/runtime/builtin/IRubyObject) Lorg/jruby/runtime/builtin/IRubyObject, arg1, arg2, ...
  • 12. java.lang.invoke.* MethodHandle CallSite ConstantCallSite MutableCallSite VolatileCallSite MethodType
  • 13. public static CallSite bootstrap ( MethodHandles.Lookup lookup, String dynMethodName, MethodType dynMethodType) throws Throwable { MethodHandle handle = lookup.findStatic( SomeClosure.class, "func", MethodType.methodType( Integer.class, Object.class, Object.class)); if (!dynMethodType.equals(handle.type())) handle = handle.asType(dynMethodType); return new ConstantCallSite(handle);}
  • 14. MutableCallSite.setTarget(MethodHandle newTarget)
  • 15. AdvantagesfastJIT-tedinlinedsignature polymorphism, arguments adaptation
  • 16. Work in ProgressJRuby - works, sort of; MirahRhino (JavaScript) - J.Rose experiment, V8 forperformance freaksGroovy - proposed for 1.9, no implJython (Python) - different priorities: PyPy, Cython,language features upgradeClojure - many features not applicable to IndyPHP.reboot
  • 17. Learn morehttp://download.java.net/jdk7/docs/technotes/guides/vm/multiple-language-support.htmlJDK 7 JSR-292 java.lang.invoke.* APIJRuby source: src/org/jruby/compiler/impl/*.javahttp://code.google.com/p/jsr292-cookbook/http://mail.openjdk.java.net/pipermail/mlvm-dev/http://www.oracle.com/technetwork/issue-archive/2010/10-may/o30java-099612.htmlhttp://blog.headius.com/2008/09/first-taste-of-invokedynamic.html

×