JooFlux at ComPAS 2013

Transcript

1. 1.

   Julien Ponge Frédéric Le Mouël JooFlux ComPAS 2013

2. 2.

   Objectifs JVM, invokedynamic Implémentation Évaluation Conclusions

3. 3.

   “Modification de code à chaud et injection d’aspects directement dans

   une JVM 7”
4. 4.

   (démo)

5. 5.

   AspectJ [Kiczales et al., 2001, CACM] Byteman [Dinn, 2011, AOSD]

   Steamloom [Bockisch et al., 2004, AOSD] JnVM [Thomas et al., 2008, SP+E] JVolve [Subramanian et al., 2009, PLDI] SafeWeave [Würthinger et al., 2011, OOPSLA] Outils VMs ad-hoc Travaux connexes
6. 6.

   Pas de langage d’aspects Pas de pré/post compilation Un agent

   Java JVM non-modifiée JooFlux Dév appli Runtime
7. 7.

   JVM, invokedynamic

8. 8.

   Machine à pile OpCodes invocation de méthode manipulation de pile

   get / set champs arithmétique allocation sauts lock (...) Constant pool (nombres, String, types) 0 java/lang/String 1 “Foo” 2 666 ... ... Variables locales 0 this (sauf static) 1 arg1 2 arg2 3 int i ... ...
9. 9.

   invokestatic public static int add(int a, int b) invokevirtual public

   int add(int a, int b) invokeinterface int add(int a, int b) invokespecial private int add(int a, int b)
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    Object call (Object receiver, Object[] args) throws Throwable; Object call

    (Object receiver) throws Throwable; Object call (Object receiver, Object arg1) throws Throwable; Object call (Object receiver, Object arg1, Object arg2) throws Throwable; Object call (Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable; Object call (Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable; Object callConstructor (Object receiver, Object [] args) throws Throwable; Object callConstructor (Object receiver) throws Throwable; Object callConstructor (Object receiver, Object arg1) throws Throwable; Object callConstructor (Object receiver, Object arg1, Object arg2) throws Throwable; Object callConstructor (Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable; Object callConstructor (Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable; Comment résoudre à l’exécution ? (extrait de Groovy)
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    public Object call(Object receiver, Object[] args) throws Throwable { return

    CallSiteArray.defaultCall(this, receiver, args); } public Object call(Object receiver) throws Throwable { return call(receiver, CallSiteArray.NOPARAM); } public Object call(Object receiver, Object arg1) throws Throwable { return call(receiver, ArrayUtil.createArray(arg1)); } public Object call(Object receiver, Object arg1, Object arg2) throws Throwable { return call(receiver, ArrayUtil.createArray(arg1, arg2)); } public Object call(Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable { return call(receiver, ArrayUtil.createArray(arg1, arg2, arg3)); } public Object call(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable { return call(receiver, ArrayUtil.createArray(arg1, arg2, arg3, arg4)); } “Tous les chemins mènent à Rome”
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    public static Object invoke(Object object, String methodName, Object[] parameters) {

    try { Class[] classTypes = new Class[parameters.length]; for (int i = 0; i < classTypes.length; i++) { classTypes[i] = parameters[i].getClass(); } Method method = object.getClass().getMethod(methodName, classTypes); return method.invoke(object, parameters); } catch (Throwable t) { return InvokerHelper.invokeMethod(object, methodName, parameters); } } Difficile pour le JIT ! CallSites génériques Réflexivité
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    invokedynamic nom symbolique + signature + bootstrap CallSite Constant Mutable

    Volatile MethodHandle direct ou combinateurs branchements adaptation filtres (...) 7
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    Implémentation

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    1 2 3 4 Chargement des classes Interception Management Runtime

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    (...) ldc #3 ldc #5 invokedynamic foo (II)I bootstraper (...)

    Call site JMX agent JooFlux bootstraper Modified bytecode Registry Target method combinators Load time action Run time action Original bytecode JVM agent 1 2 3 4
17. 17.

    Réécriture de bytecode ASM + Agent Bootstrap JooFlux Casse la

    vérification de bytecode ! 1
18. 18.

    sémantique champ volatile impact mesuré négligeable VolatileCallSite 2

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    invokestatic invokespecial Method handle direct invokevirtual invokeinterface Method handle sur

    le premier receveur 3
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    invokeinterface Polymorphic inline-cache guardWithTest(Class1, obj) guardWithTest(Class2, obj) fallback(callsite, args[]) Class1#foo(II)I

    Class2#foo(II)I obj.foo(1, 2) 3
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    4 public interface JooFluxManagementMXBean { public String getName(); public int

    getNumberOfRegisteredCallSites(); public Set<String> getRegisteredCallSiteKeys(); public String getCallSiteType(String target); public void changeCallSiteTarget(String methodType, String oldTarget, String newTarget); public void applyBeforeAspect(String callSitesKey, String aspectClass, String aspectMethod); public void applyAfterAspect(String callSitesKey, String aspectClass, String aspectMethod); }
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    (...) ldc #3 ldc #5 invokedynamic foo (II)I bootstraper (...)

    Call site JMX agent JooFlux bootstraper Modified bytecode Registry Target method combinators Load time action Run time action Original bytecode JVM agent 4 Registre : 0 impact perfs Enregistré à la 1ère interception Modification via API
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    Évaluation

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    Interception / redirection de méthode Injection d’aspect ‘vide’ Langages dynamiques

    Plates-formes AOP Micro Fibonacci(40) Macro SCImark Fork/Join Clojure Benchmarks X V V V
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    0 2 4 6 8 Byteman Jooflux Avant Après Avant

    + Après Injection d’aspect ‘vide’ x 137 x 134 x 306 x 6 x 2 x 5 Microbench
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    Interception/redirection méthode 0 5 10 15 Clojure JRuby Groovy Rhino

    JS Jython Java+JooFlux Min Max x 1 x 48 x 18 x 15 x 2,2 x 10 x 3 x 6 x 1,2 x 2 Microbench
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    Interception/redirection méthode 0.9 1 1.1 SCIMark Fork/Join Clojure Min Max

    x 0,99 x 0,97 x 1,04 x 0,93 x 1,01 x 1,01 Macrobench
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    Conclusion

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    JVM généraliste Interception à grain fin Résultats initiaux encourageants Approche

    nouvelle, générique, sans langage dédié Bilan
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    Injection atomique multi-aspects Rollback / versioning Vérification formelle pré-injection Aspects

    contextuels / Internet of Things Contrôle de ressources avec isolation adaptative Perspectives
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    https://github.com/dynamid/jooflux Questions / réponses Julien Ponge Frédéric Le Mouël http://dynamid.citi-lab.fr/