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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
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Invoke Dynamic

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  • 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

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