{"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\/fr\/blog\/news\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","title":{"rendered":"Premi\u00e8re version de wasm3, un interpr\u00e9teur rapide de WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Disponible<\/a><\/noindex> premi\u00e8re version wasm3<\/a><\/noindex>, un interpr\u00e9teur de code interm\u00e9diaire WebAssembly tr\u00e8s rapide, principalement destin\u00e9 \u00e0 ex\u00e9cuter des applications WebAssembly sur des microcontr\u00f4leurs et des plateformes o\u00f9 une impl\u00e9mentation JIT pour WebAssembly est absente, o\u00f9 la m\u00e9moire est insuffisante pour faire fonctionner le JIT, ou o\u00f9 la cr\u00e9ation de pages m\u00e9moire ex\u00e9cutables n\u00e9cessaires \u00e0 la mise en \u0153uvre du JIT n'est pas autoris\u00e9e. Le code du projet est \u00e9crit en langage C et est distribu\u00e9<\/a><\/noindex> sous licence MIT.<\/p>\n

Wasm3 est compatible tests<\/a><\/noindex> avec la sp\u00e9cification WebAssembly 1.0 et peut \u00eatre utilis\u00e9 pour ex\u00e9cuter de nombreuses applications WASI, offrant des performances seulement 4 \u00e0 5 fois inf\u00e9rieures \u00e0 celles des moteurs JIT (liftoff<\/a><\/noindex>, cranelift<\/a><\/noindex>) et 11,5 fois inf\u00e9rieures \u00e0 celles de l'ex\u00e9cution de code natif. Compar\u00e9 \u00e0 d'autres interpr\u00e9teurs WebAssembly (wac<\/a><\/noindex>, life<\/a><\/noindex>, wasm-micro-runtime<\/a><\/noindex>), wasm3 s'est av\u00e9r\u00e9 15,8 fois plus rapide.<\/p>\n

Pour faire fonctionner wasm3, 64 Ko de m\u00e9moire sont n\u00e9cessaires pour le code et 10 Ko de RAM, ce qui permet d'ex\u00e9cuter des applications compil\u00e9es en WebAssembly sur des microcontr\u00f4leurs<\/a><\/noindex>, tels que Arduino MKR*, Arduino Due, Particle Photon, ESP8266, ESP32, Air602 (W600), nRF52, nRF51 Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
\nMaix (K210), HiFive1 (E310), Fomu (ICE40UP5K) et ATmega1284, ainsi que sur des cartes et ordinateurs bas\u00e9s sur les architectures x86, x64, ARM, MIPS, RISC-V et Xtensa. Les syst\u00e8mes d'exploitation pris en charge incluent Linux (y compris les routeurs bas\u00e9s sur OpenWRT), Windows, macOS, Android et iOS. Une compilation de wasm3 en code interm\u00e9diaire WebAssembly est \u00e9galement possible pour ex\u00e9cuter l'interpr\u00e9teur dans un navigateur ou pour un lancement embarqu\u00e9 (self-hosting).<\/p>\n

De hautes performances sont atteintes gr\u00e2ce \u00e0 l'utilisation dans l'interpr\u00e9teur de la technique Massey Meta Machine<\/a><\/noindex> (M3), qui r\u00e9duit les frais g\u00e9n\u00e9raux de d\u00e9codage du bytecode en effectuant une traduction anticip\u00e9e du bytecode en op\u00e9rations plus efficaces, g\u00e9n\u00e9rant du code-machine pseudo, tandis que le mod\u00e8le d'ex\u00e9cution de la machine virtuelle \u00e0 pile est transform\u00e9 en une approche plus efficace bas\u00e9e sur des registres. Les op\u00e9rations dans M3 sont des fonctions C, dont les arguments sont des registres de la machine virtuelle, pouvant \u00eatre mapp\u00e9s sur les registres CPU. Les s\u00e9quences d'op\u00e9rations fr\u00e9quentes pour l'optimisation sont transform\u00e9es en op\u00e9rations agr\u00e9g\u00e9es.<\/p>\n

Il convient \u00e9galement de noter r\u00e9sultats de l'\u00e9tude<\/a><\/noindex> de distribution
\nWebAssembly sur le Web. En analysant 948 000 des sites les plus populaires selon le classement Alexa, les chercheurs ont d\u00e9couvert que WebAssembly est utilis\u00e9 sur 1639 sites (0,17 %), soit 1 sur 600 sites. Au total, 1950 modules WebAssembly ont \u00e9t\u00e9 d\u00e9tect\u00e9s sur ces sites, dont 150 sont uniques. En examinant les cas d'utilisation de WebAssembly, des conclusions peu encourageantes ont \u00e9t\u00e9 tir\u00e9es \u2014 dans plus de 50 % des cas, WebAssembly a \u00e9t\u00e9 utilis\u00e9 \u00e0 des fins malveillantes, par exemple pour le minage de cryptomonnaies (55,7 %) et pour dissimuler le code de scripts malveillants (0,2 %). Parmi les utilisations l\u00e9gitimes de WebAssembly, on note l'ex\u00e9cution de biblioth\u00e8ques (38,8 %), la cr\u00e9ation de jeux (3,5 %) et l'ex\u00e9cution de code \u00e9crit dans des langages autres que JavaScript (0,9 %). Dans 14,9 % des cas, WebAssembly a \u00e9t\u00e9 utilis\u00e9 pour analyser l'environnement afin d'identifier l'utilisateur (empreintes digitales).
\n

\"Premi\u00e8re<\/center><\/p>\n

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

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

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