{"id":55147,"date":"2020-01-13T00:00:00","date_gmt":"2020-01-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly"},"modified":"2020-02-18T14:03:13","modified_gmt":"2020-02-18T11:03:13","slug":"pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","title":{"rendered":"Prvn\u00ed vyd\u00e1n\u00ed wasm3, rychl\u00e9ho interpretr\u00e1tora WebAssembly.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dostupn\u00e9<\/a><\/noindex> prvn\u00ed vyd\u00e1n\u00ed wasm3<\/a><\/noindex>, velmi rychl\u00fd interpret mezik\u00f3du WebAssembly, kter\u00fd je prim\u00e1rn\u011b navr\u017een pro spu\u0161t\u011bn\u00ed aplikac\u00ed WebAssembly na mikrokontrol\u00e9rech a platform\u00e1ch, pro kter\u00e9 neexistuje implementace JIT pro WebAssembly, je nedostatek pam\u011bti pro JIT nebo nen\u00ed povoleno vytv\u00e1\u0159en\u00ed spustiteln\u00fdch str\u00e1nek pam\u011bti pot\u0159ebn\u00fdch pro implementaci JIT. K\u00f3d projektu je naps\u00e1n v jazyce C a distribuov\u00e1no<\/a><\/noindex> je licencov\u00e1n pod MIT licenc\u00ed.<\/p>\n

Wasm3 proch\u00e1zej\u00ed testy<\/a><\/noindex> na kompatibilitu se specifikac\u00ed WebAssembly 1.0 a je mo\u017en\u00e9 je pou\u017e\u00edt pro spu\u0161t\u011bn\u00ed mnoha aplikac\u00ed WASI, p\u0159i\u010dem\u017e v\u00fdkon je pouze 4-5kr\u00e1t ni\u017e\u0161\u00ed ne\u017e u JIT motor\u016f (liftoff<\/a><\/noindex>, cranelift<\/a><\/noindex>) a 11,5kr\u00e1t ni\u017e\u0161\u00ed ne\u017e p\u0159i vykon\u00e1v\u00e1n\u00ed nativn\u00edho k\u00f3du. P\u0159i porovn\u00e1n\u00ed s jin\u00fdmi interprety WebAssembly (wac<\/a><\/noindex>, life<\/a><\/noindex>, wasm-micro-runtime<\/a><\/noindex>), wasm3 se uk\u00e1zal jako rychlej\u0161\u00ed na 15,8kr\u00e1t.<\/p>\n

Pro provoz wasm3 je pot\u0159eba 64 KB pam\u011bti pro k\u00f3d a 10 KB RAM, co\u017e umo\u017e\u0148uje pou\u017eit\u00ed projektu pro spou\u0161t\u011bn\u00ed aplikac\u00ed zkompilovan\u00fdch do WebAssembly na mikrokontrol\u00e9rech<\/a><\/noindex>, jako jsou Arduino MKR*, Arduino Due, Particle Photon, ESP8266, ESP32, Air602 (W600), nRF52, nRF51 Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
\nMaix (K210), HiFive1 (E310), Fomu (ICE40UP5K) a ATmega1284, stejn\u011b jako na desk\u00e1ch a po\u010d\u00edta\u010d\u00edch na z\u00e1klad\u011b architektur x86, x64, ARM, MIPS, RISC-V a Xtensa. Mezi podporovan\u00e9 opera\u010dn\u00ed syst\u00e9my pat\u0159\u00ed Linux (v\u010detn\u011b sm\u011brova\u010d\u016f zalo\u017een\u00fdch na OpenWRT), Windows, macOS, Android a iOS. Tak\u00e9 je mo\u017en\u00e9 kompilovat wasm3 do mezik\u00f3du WebAssembly pro spu\u0161t\u011bn\u00ed interpretu v prohl\u00ed\u017ee\u010di nebo pro vno\u0159en\u00e9 spu\u0161t\u011bn\u00ed (self-hosting).<\/p>\n

Vysok\u00fd v\u00fdkon je dosa\u017een d\u00edky pou\u017eit\u00ed v interpretaci techniky Massey Meta Machine<\/a><\/noindex> (M3), kde k redukci re\u017eijn\u00edch n\u00e1klad\u016f na dek\u00f3dov\u00e1n\u00ed bajtk\u00f3du se prov\u00e1d\u00ed p\u0159edb\u011b\u017en\u00e1 translace bajtk\u00f3du na efektivn\u011bj\u0161\u00ed operace, kter\u00e9 generuj\u00ed pseudo-strojov\u00fd k\u00f3d, a model vykon\u00e1v\u00e1n\u00ed z\u00e1sobn\u00edkov\u00e9 virtu\u00e1ln\u00ed stroje je p\u0159eveden na efektivn\u011bj\u0161\u00ed registr. Operace v M3 p\u0159edstavuj\u00ed funkce C, jejich\u017e argumenty jsou registry virtu\u00e1ln\u00edho stroje, kter\u00e9 mohou b\u00fdt mapov\u00e1ny na registry CPU. \u010casto se vyskytuj\u00edc\u00ed sekvence operac\u00ed pro optimalizaci se transformuj\u00ed na sjednocen\u00e9 operace.<\/p>\n

D\u00e1le lze poznamenat v\u00fdsledky v\u00fdzkumu<\/a><\/noindex> roz\u0161\u00ed\u0159en\u00ed
\nWebAssembly na webu. Anal\u00fdzou 948 tis\u00edc nejpopul\u00e1rn\u011bj\u0161\u00edch webov\u00fdch str\u00e1nek podle hodnocen\u00ed Alexa v\u00fdzkumn\u00edci zjistili, \u017ee WebAssembly se pou\u017e\u00edv\u00e1 na 1639 webech (0,17 %), t. j. na 1 z ka\u017ed\u00fdch 600 str\u00e1nek. Na str\u00e1nk\u00e1ch bylo identifikov\u00e1no celkem 1950 modul\u016f WebAssembly, z nich\u017e 150 je unik\u00e1tn\u00edch. P\u0159i zkoum\u00e1n\u00ed oblasti pou\u017eit\u00ed WebAssembly byly u\u010din\u011bny znepokojiv\u00e9 z\u00e1v\u011bry \u2014 ve v\u00edce ne\u017e 50 % p\u0159\u00edpad\u016f byl WebAssembly vyu\u017e\u00edv\u00e1n \u0161kodliv\u00fdm zp\u016fsobem, nap\u0159\u00edklad k t\u011b\u017eb\u011b kryptom\u011bn (55,7 %) a skr\u00fdv\u00e1n\u00ed k\u00f3du \u0161kodliv\u00fdch skript\u016f (0,2 %). Z legitimn\u00edch pou\u017eit\u00ed WebAssembly bylo zaznamen\u00e1no prov\u00e1d\u011bn\u00ed knihoven (38,8 %), vytv\u00e1\u0159en\u00ed her (3,5 %) a vykon\u00e1v\u00e1n\u00ed vlastn\u00edho k\u00f3du napsan\u00e9ho v jin\u00e9m ne\u017e JavaScriptu (0,9 %). V 14,9 % p\u0159\u00edpad\u016f byl WebAssembly pou\u017eit pro anal\u00fdzu prost\u0159ed\u00ed za \u00fa\u010delem identifikace u\u017eivatele (fingerprinting).
\n

\"Prvn\u00ed<\/center><\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a wasm3, \u043e\u0447\u0435\u043d\u044c \u0431\u044b\u0441\u0442\u0440\u043e\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u0430 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 WebAssembly, \u0433\u043b\u0430\u0432\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d\u043d\u043e\u0433\u043e \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 WebAssembly-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430\u0445 \u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u0445, \u0434\u043b\u044f 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