The_Dalvik_Virtual_Machine

The_Dalvik_Virtual_Machine

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时间:2019-07-21

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1、DavidEhringerMarch,2010THEDALVIKVIRTUALMACHINEARCHITECTUREIntroductionJavahasalwaysbeenmarketedas“writeonce,runanywhere.”ThecapabilityhaslargelybeenmadepossiblebytheJavaPlatform,thefoundationofwhichistheJavaVirtualMachine(JVM).Althoughthisgoalhaslargelybeenme

2、tfortheJavaplatformondesktop(JSE)andserver(JEE)environments,themobileJavaecosystem(JME)isabitmorefragmentedwithvariousconfigurations,profiles,andpackagescausingsignificantmodificationstoapplicationsinordertosupportdifferentdevices.WhileGooglehasselectedJavaasthel

3、anguagefordevelopingAndroidapplications,ithaschosentoabandonbothJMEandtheJVMinfavorofanalternativedeploymenttarget,theDalvikvirtualmachine.GooglehasalsochosentouseanalternativeandlimitedimplementationofthestandardJavalibraries.Bothofthesearenon-standardJava,a

4、ndeffectivelyrepresentforkingoftheJavaplatform.ThisseemstobreakfromthetrendofpeopletargetingtheJVMasatheruntimeplatformforaverywiderangeoflanguages.Scala,Groovy,JRuby,Jython,andClojureareonlyafewofthedozensoflanguagesthatrunontheJVM.Theselanguagescannotonlyta

5、keadvantageofthemanyfeaturesoftheJVMbutalsoseamlesslyleverageallthestandardJavalibrariesandthecountlesscustomlibrariescreatedbyindividualsandorganizations.Recently,Googlehasbeensubtletybuckingthistrendbycreatednon-standardJavatechnologies.Thisincludesnononlyt

6、heAndroidplatformbutalsoGoogleWebToolkit(GWT)andGoogleAppEngine,thereasonsofwhichtheyarenon-standardisbeyondthescopeofthispaperastheyaren’tmobiletechnologies.ButthetrendmaybeapplicabletowhathashappenedintheJMEspace.Non-standardJavaimplementationsmayfurtherfra

7、gmenttheplatformcauseadditionalheadachesfordeveloperslookingtosupportthewidearraydevicescurrentlyonthemarket.ThispaperlookstounderstandthearchitectureofDalvikvirtualmachineandunderstandthetechnicalreasonsforwhyGooglechosetodevelopertheirownnon-standardvirtual

8、machine.WhiletherearemostlikelyalsobusinessreasonsbehindcreatingDalvik,thispaperonlyaddressestechnicalconsiderations.DesignConstraintsImposedbytheTargetPlatformsTheAndroidplatformwascreat

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