Dalvik: „inna” Java

nie jestem pewien co do plikow .dex (brakuje ciagle czasu by to osobiscie zweryfikowac) ale z tego co wyczytalem na sieciu (link zrodlowy, grupa dyskusyjna), pliki te to poprostu .jar-y ze zmienionym rozszerzeniem.

wyglada na to ze dalvik to zwykly interpreter/vm bytecode javy. glowne roznice wzgledem sunowskiej javy to:

1) vm interpretowalna, bez jit (choc jest w planach i chyba bedzie opierac sie o llvm)

2) biblioteka standardowa (wzgledem suna pozbawiona np. awt, corby i innych rzeczy z p. widzenia google niepotrzebnych)

co do omijania licencji j2me – wszelkie znaki na ziemi i niebie wlasnie wskazuja na to ze dalvik powstal z tych wlasnie wzgledow (sun mocno stara sie trzymac najbardziej lukratywna czesc rynku). minusem tego zamieszania jest wlasnie interpretowalna maszyna wirtualna, miast np. hotspota sunowskiego (co mnie troche dziwi, bo ztpc jest on dostepny na GPL) bedacego w tej chwili prawdopodobnie najszybsza/najlepsza crossplatformowa implementacja maszyny wirtualnej javy.

chociaz… jak google skorzysta z ludzi ktorzy sie na grupie androida zglosili (wskazujac swoje wczesniejsze doswiadczenia w tej mierze) do pomocy w oparciu dlavika o llvm – ma on szanse zdetronizowac krola…

a nikt nie probował tego bytecodu skompilowac bezposrednio poprzec gcc (wypluc kod posredni do optymalizacji). prosti, szybko i bez problemow.

troszke wiekszy libc trzeba by bylo i tyle

Czy to o czym pisze autor to nie jest poprostu AOT?

W sensie, Google zrobilo cos w stylu Microsoftu dawno temu – zmienilo na tyle malo, zeby sobie nie robic problemow technicznych, ale na tyle duzo, zeby niczym poza Androidem tego bytecodu nie dalo sie uruchomic. Nie ma co, ucza sie od najlepszych. ;->

Java jest akies 16 razy wolniejsza od kodu natywnego
http://groups.google.com/group/android-developers…

No to będzie rebus. Ponieważ Android implementuje tylko niewielką część funkcjonalności JavaME. Oferuje sporo dodatkowych i przydatnych bibliotek (na przykład httpclient czy junit), ale nie jest zgodny nawet z profilem CDC.

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