{"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\/sv\/blog\/news\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","title":{"rendered":"F\u00f6rsta utg\u00e5van av wasm3, en snabb tolk f\u00f6r WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tillg\u00e4nglig<\/a><\/noindex> f\u00f6rsta utg\u00e5van wasm3<\/a><\/noindex>, en mycket snabb interpreter f\u00f6r WebAssembly mellanliggande kod, fr\u00e4mst avsedd f\u00f6r att k\u00f6ra WebAssembly-applikationer p\u00e5 mikrokontroller och plattformar d\u00e4r JIT-implementationen f\u00f6r WebAssembly saknas, minnet \u00e4r otillr\u00e4ckligt f\u00f6r att JIT ska fungera eller skapandet av utf\u00f6rbara minnessidor, n\u00f6dv\u00e4ndiga f\u00f6r JIT-implementationen, inte till\u00e5ts. Projektkoden \u00e4r skriven i C och sprids<\/a><\/noindex> licensieras under MIT.<\/p>\n

Wasm3 genomg\u00e5r tester<\/a><\/noindex> f\u00f6r \u00f6verensst\u00e4mmelse med specifikationen WebAssembly 1.0 och kan anv\u00e4ndas f\u00f6r att k\u00f6ra m\u00e5nga WASI-applikationer, vilket s\u00e4kerst\u00e4ller prestanda som \u00e4r endast 4-5 g\u00e5nger l\u00e4gre \u00e4n JIT-motorer (liftoff<\/a><\/noindex>, cranelift<\/a><\/noindex>) och 11,5 g\u00e5nger l\u00e4gre \u00e4n k\u00f6rning av inhemsk kod. Vid j\u00e4mf\u00f6relse med andra WebAssembly-tolkar (wac<\/a><\/noindex>, life<\/a><\/noindex>, wasm-micro-runtime<\/a><\/noindex>), visade sig wasm3 vara 15,8 g\u00e5nger snabbare.<\/p>\n

F\u00f6r att k\u00f6ra wasm3 kr\u00e4vs 64KB minne f\u00f6r kod och 10KB RAM, vilket g\u00f6r projektet till\u00e4mpligt f\u00f6r k\u00f6rning av WebAssembly-kompilerade applikationer p\u00e5 mikrokontroller<\/a><\/noindex>, s\u00e5som Arduino MKR*, Arduino Due, Particle Photon, ESP8266, ESP32, Air602 (W600), nRF52, nRF51 Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
\nMaix (K210), HiFive1 (E310), Fomu (ICE40UP5K) och ATmega1284, samt p\u00e5 kort och datorer baserade p\u00e5 x86, x64, ARM, MIPS, RISC-V och Xtensa-arkitekturer. St\u00f6dda operativsystem inkluderar Linux (\u00e4ven routrar baserade p\u00e5 OpenWRT), Windows, macOS, Android och iOS. Kompilering av wasm3 till WebAssembly mellanliggande kod f\u00f6r att k\u00f6ra tolken i webbl\u00e4saren eller f\u00f6r sj\u00e4lvinb\u00e4ddning (self-hosting) \u00e4r ocks\u00e5 m\u00f6jligt.<\/p>\n

H\u00f6g prestanda uppn\u00e5s genom att anv\u00e4nda tekniken Massey Meta Machine<\/a><\/noindex> (M3), d\u00e4r f\u00f6r att minska overheaden vid dekodning av bytekod, utf\u00f6rs f\u00f6rhands\u00f6vers\u00e4ttning av bytekod till mer effektiva operationer som genererar pseudomaskinkod, och den stackbaserade virtuella maskinens exekveringsmodell omvandlas till en mer effektiv registerbaserad metod. Operationerna i M3 \u00e4r C-funktioner vars argument \u00e4r virtuella maskinregister, som kan motsvara CPU-register. Vanligt f\u00f6rekommande operationf\u00f6ljder f\u00f6r optimering omvandlas till sammanslagna operationer.<\/p>\n

Dessutom kan det n\u00e4mnas forskningens resultat<\/a><\/noindex> spridning
\nWebAssembly p\u00e5 webben. Genom att analysera 948 000 av de mest popul\u00e4ra webbplatserna enligt Alexa-rankingen, har forskare funnit att WebAssembly anv\u00e4nds p\u00e5 1639 webbplatser (0,17%), det vill s\u00e4ga p\u00e5 1 av varje 600 webbplatser. Totalt har 1950 moduler av WebAssembly laddats upp p\u00e5 webbplatser, varav 150 \u00e4r unika. Vid granskning av anv\u00e4ndningsomr\u00e5dena f\u00f6r WebAssembly drogs orov\u00e4ckande slutsatser \u2014 i mer \u00e4n 50 % av fallen anv\u00e4ndes WebAssembly f\u00f6r skadliga syften, s\u00e5som kryptovaluta-mining (55,7 %) och f\u00f6r att d\u00f6lja koden f\u00f6r skadliga skript (0,2 %). Bland de legitima anv\u00e4ndningarna av WebAssembly noterades k\u00f6rning av bibliotek (38,8 %), skapande av spel (3,5 %) och k\u00f6rning av egen kod skriven i andra spr\u00e5k \u00e4n JavaScript (0,9 %). I 14,9 % av fallen anv\u00e4ndes WebAssembly f\u00f6r att analysera omgivningen f\u00f6r att identifiera anv\u00e4ndare (fingerprinting).
\n

\"F\u00f6rsta<\/center><\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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