{"id":36081,"date":"2019-10-31T22:09:30","date_gmt":"2019-10-31T19:09:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs\/"},"modified":"2019-10-31T22:09:30","modified_gmt":"2019-10-31T19:09:30","slug":"osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","title":{"rendered":"Il fondatore di QEMU e FFmpeg ha pubblicato il motore JavaScript QuickJS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il matematico francese Fabrice Bellard, fondatore dei progetti QEMU e FFmpeg, nonch\u00e9 creatore della formula pi\u00f9 veloce per calcolare il numero Pi e sviluppatore del formato delle immagini <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41198\">BPG<\/a><\/noindex>, ha pubblicato il primo rilascio di un nuovo motore JavaScript. <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/\">QuickJS<\/a><\/noindex>Il motore \u00e8 caratterizzato da compattezza ed \u00e8 orientato all'integrazione in altri sistemi. Il codice del progetto \u00e8 scritto in linguaggio C e viene distribuito sotto licenza MIT. \u00c8 disponibile anche una build del motore, compilata in WebAssembly tramite Emscripten e adatta per l'esecuzione nei browser.<\/p>\n<p>Implementazione di JavaScript <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/quickjs.html\">supporta<\/a><\/noindex> rispetta la specifica ES2019, inclusi moduli, generatori asincroni e proxy. Supporto opzionale per funzioni matematiche non standard <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/jsbignum.html\">estensione<\/a><\/noindex> per JavaScript, come i tipi BigInt e BigFloat, oltre a <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9F%D0%B5%D1%80%D0%B5%D0%B3%D1%80%D1%83%D0%B7%D0%BA%D0%B0_%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%BE%D0%B2\">sovraccarico degli operatori<\/a><\/noindex>. In termini di prestazioni, QuickJS risulta significativamente <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/bench.html\">gli<\/a><\/noindex> superiore ai motori esistenti, ad esempio nel test<br \/>\n bench-v8, che supera il motore <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Moddable-OpenSource\/moddable\">XS<\/a><\/noindex> del 35%, <noindex><a rel=\"nofollow\" href=\"https:\/\/duktape.org\/\">DukTape<\/a><\/noindex> di oltre il doppio, <noindex><a rel=\"nofollow\" href=\"http:\/\/jerryscript.net\/\">JerryScript<\/a><\/noindex> per tre volte, e <noindex><a rel=\"nofollow\" href=\"https:\/\/mujs.com\/\">MuJS<\/a><\/noindex> di sette volte.<\/p>\n<p>Oltre alla libreria per integrare il motore nelle applicazioni, il progetto offre anche un interprete qjs, utilizzabile per eseguire codice JavaScript dalla riga di comando. Inoltre, \u00e8 disponibile un compilatore qjsc, capace di generare file eseguibili autonomi, privi di dipendenze esterne. <\/p>\n<p>Caratteristiche principali:<\/p>\n<ul>\n<li class=\"l\"> Compattezza e facilit\u00e0 di integrazione in altri progetti. Il codice include solo pochi file in linguaggio C, senza la necessit\u00e0 di dipendenze esterne per la compilazione. L'applicazione pi\u00f9 semplice compilata occupa circa 190 KB;\n<li class=\"l\"> Prestazioni molto elevate e tempi di avvio ridotti. Il completamento di 56.000 test di compatibilit\u00e0 con ECMAScript richiede circa 100 secondi su un singolo core di un normale PC desktop. L'inizializzazione del runtime richiede meno di 300 microsecondi;\n<li class=\"l\"> Quasi completa supporto alla specifica ES2019 e supporto completo all'applicazione &#171;B&#187;, che definisce i componenti per la compatibilit\u00e0 con le vecchie web app;\n<li class=\"l\"> Completamento completo di tutti i test del set ECMAScript Test Suite;\n<li class=\"l\"> Supporto per la compilazione di codice JavaScript in file eseguibili senza dipendenze esterne;\n<li class=\"l\"> Raccolta dei rifiuti basata sul conteggio dei riferimenti senza esecuzione di pulizia ciclica, che ha consentito di ottenere un comportamento prevedibile e una riduzione del consumo di memoria;\n<li class=\"l\"> Set di estensioni per calcoli matematici in linguaggio JavaScript;\n<li class=\"l\"> Un'interfaccia per l'esecuzione di codice in modalit\u00e0 a riga di comando, che supporta l'evidenziazione della sintassi;\n<li class=\"l\"> Una libreria standard compatta con un'interfaccia sopra la libreria C.\n<\/ul>\n<p>Il progetto sviluppa anche tre librerie C complementari, utilizzate in QuickJS e adatte per un uso separato: <\/p>\n<ul>\n<li class=\"l\"> libregexp &#8212; implementazione veloce di espressioni regolari, completamente compatibili con la specifica Javascript ES 2019;\n<li class=\"l\"> libunicode &#8212; libreria compatta per lavorare con Unicode;\n<li class=\"l\"> libbf &#8212; implementazione di operazioni con numeri a virgola mobile di precisione arbitraria e funzioni trascendenti con arrotondamento esatto.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51079\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a \u0424\u0430\u0431\u0440\u0438\u0441 \u0411\u0435\u043b\u043b\u0430\u0440 (Fabrice Bellard), \u043e\u0441\u043d\u043e\u0432\u0430\u0432\u0448\u0438\u0439 \u0432 \u0441\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU \u0438 FFmpeg, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0441\u043e\u0437\u0434\u0430\u0432\u0448\u0438\u0439 \u0441\u0430\u043c\u0443\u044e \u0431\u044b\u0441\u0442\u0440\u0443\u044e \u0444\u043e\u0440\u043c\u0443\u043b\u0443 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u0447\u0438\u0441\u043b\u0430 \u041f\u0438 \u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u0432\u0448\u0438\u0439 \u0444\u043e\u0440\u043c\u0430\u0442 \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439 BPG, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043d\u043e\u0432\u043e\u0433\u043e JavaScript-\u0434\u0432\u0438\u0436\u043a\u0430 QuickJS. \u0414\u0432\u0438\u0436\u043e\u043a \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0441\u0442\u044c\u044e \u0438 \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d \u043d\u0430 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u043d\u0438\u0435 \u0432 \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-36081","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a \u0424\u0430\u0431\u0440\u0438\u0441 \u0411\u0435\u043b\u043b\u0430\u0440 (Fabrice Bellard), \u043e\u0441\u043d\u043e\u0432\u0430\u0432\u0448\u0438\u0439 \u0432 \u0441\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU \u0438 FFmpeg, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0441\u043e\u0437\u0434\u0430\u0432\u0448\u0438\u0439 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