{"id":103828,"date":"2022-04-20T15:37:16","date_gmt":"2022-04-20T13:37:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-predvaritelnyj-variant-standarta-webassembly-2-0"},"modified":"2022-04-20T15:37:16","modified_gmt":"2022-04-20T13:37:16","slug":"dostupen-predvaritelnyj-variant-standarta-webassembly-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupen-predvaritelnyj-variant-standarta-webassembly-2-0","title":{"rendered":"K dispozici je p\u0159edb\u011b\u017en\u00e1 verze standardu WebAssembly 2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Konsorcium W3C publikovalo pracovn\u00ed verzi nov\u00e9 specifikace, kter\u00e1 standardizuje mezik\u00f3d WebAssembly 2.0 a souvisej\u00edc\u00ed API, kter\u00e9 umo\u017e\u0148uje vytv\u00e1\u0159et vysoce v\u00fdkonn\u00e9 aplikace p\u0159enositeln\u00e9 mezi prohl\u00ed\u017ee\u010di a hardwarov\u00fdmi platformami. WebAssembly poskytuje nez\u00e1visl\u00fd na prohl\u00ed\u017ee\u010di univerz\u00e1ln\u00ed n\u00edzko\u00farov\u0148ov\u00fd mezik\u00f3d pro vykon\u00e1v\u00e1n\u00ed aplikac\u00ed zkompilovan\u00fdch z r\u016fzn\u00fdch programovac\u00edch jazyk\u016f. D\u00edky vyu\u017eit\u00ed JIT pro WebAssembly lze dos\u00e1hnout \u00farovn\u011b v\u00fdkonu bl\u00edzk\u00e9 nativn\u00edmu k\u00f3du.      <\/p>\n<p>Technologie WebAssembly m\u016f\u017ee b\u00fdt pou\u017eita k vykon\u00e1v\u00e1n\u00ed v prohl\u00ed\u017ee\u010di \u00fakol\u016f vy\u017eaduj\u00edc\u00edch vysok\u00fd v\u00fdkon, nap\u0159\u00edklad k\u00f3dov\u00e1n\u00ed videa, zpracov\u00e1n\u00ed zvuku, manipulace s grafikou a 3D, v\u00fdvoj her, kryptografick\u00e9 operace a matematick\u00e9 v\u00fdpo\u010dty prost\u0159ednictv\u00edm organizace vykon\u00e1v\u00e1n\u00ed v prohl\u00ed\u017ee\u010di k\u00f3du napsan\u00e9ho v kompilovan\u00fdch jazyc\u00edch, jako jsou C\/C++.        <\/p>\n<p>Mezi hlavn\u00ed \u00fakoly WebAssembly pat\u0159\u00ed zaji\u0161t\u011bn\u00ed p\u0159enositelnosti, p\u0159edv\u00eddatelnosti chov\u00e1n\u00ed a identity vykon\u00e1v\u00e1n\u00ed k\u00f3du na r\u016fzn\u00fdch platform\u00e1ch. V posledn\u00ed dob\u011b je WebAssembly tak\u00e9 propagov\u00e1n jako univerz\u00e1ln\u00ed platforma pro bezpe\u010dn\u00e9 vykon\u00e1v\u00e1n\u00ed k\u00f3du v jak\u00e9koli infrastruktu\u0159e, opera\u010dn\u00edch syst\u00e9mech a za\u0159\u00edzen\u00edch, ani\u017e by byl omezen na prohl\u00ed\u017ee\u010de.        <\/p>\n<p>W3C publikovalo t\u0159i p\u0159edb\u011b\u017en\u00e9 specifikace WebAssembly 2.0:  <\/p>\n<ul>\n<li class=\"l\">  WebAssembly Core \u2014 popisuje n\u00edzko\u00farov\u0148ov\u00fd virtu\u00e1ln\u00ed stroj pro vykon\u00e1v\u00e1n\u00ed mezik\u00f3du WebAssembly. Souvisej\u00edc\u00ed zdroje WebAssembly jsou dod\u00e1v\u00e1ny ve form\u00e1tu &#171;.wasm&#187;, podobn\u00e9m soubor\u016fm &#171;.class&#187; v Jav\u011b a obsahuj\u00ed statick\u00e1 data a segmenty k\u00f3du pro pr\u00e1ci s t\u011bmito daty.   <\/li>\n<li class=\"l\"> WebAssembly JavaScript Interface \u2014 poskytuje API pro integraci s JavaScriptem. Umo\u017e\u0148uje z\u00edsk\u00e1vat hodnoty a p\u0159ed\u00e1vat parametry do funkc\u00ed WebAssembly. Vykon\u00e1n\u00ed WebAssembly odpov\u00edd\u00e1 bezpe\u010dnostn\u00edmu modelu JavaScriptu a ve\u0161ker\u00e1 interakce se z\u00e1kladn\u00edm syst\u00e9mem prob\u00edh\u00e1 analogicky k vykon\u00e1v\u00e1n\u00ed JavaScriptov\u00e9ho k\u00f3du.      <\/li>\n<li class=\"l\">  WebAssembly Web API \u2014 definuje programov\u00e9 rozhran\u00ed zalo\u017een\u00e9 na mechanismu Promise pro po\u017eadov\u00e1n\u00ed a vykon\u00e1v\u00e1n\u00ed zdroj\u016f &#171;.wasm&#187;. Form\u00e1t zdroj\u016f WebAssembly je optimalizov\u00e1n pro zah\u00e1jen\u00ed vykon\u00e1v\u00e1n\u00ed, ani\u017e by bylo t\u0159eba \u010dekat na \u00fapln\u00e9 na\u010dten\u00ed souboru, co\u017e zvy\u0161uje reaktivitu webov\u00fdch aplikac\u00ed.  <\/ul>\n<p>Mezi hlavn\u00ed zm\u011bny ve WebAssembly 2.0 ve srovn\u00e1n\u00ed s prvn\u00ed verz\u00ed standardu pat\u0159\u00ed:    <\/p>\n<ul>\n<li class=\"l\"> Podpora vektorov\u00e9ho typu v128 a souvisej\u00edc\u00edch vektorov\u00fdch instrukc\u00ed, kter\u00e9 umo\u017e\u0148uj\u00ed paraleln\u00ed vykon\u00e1v\u00e1n\u00ed operac\u00ed nad n\u011bkolika \u010d\u00edseln\u00fdmi hodnotami (SIMD, single instruction multiple data).\n<li class=\"l\"> Mo\u017enost importu a exportu m\u011bniteln\u00fdch (mutable) glob\u00e1ln\u00edch prom\u011bnn\u00fdch, kter\u00e9 umo\u017e\u0148uj\u00ed aplikaci glob\u00e1ln\u00ed vazby pro takov\u00e9 hodnoty, jako jsou ukazatele z\u00e1sobn\u00edku v C++.\n<li class=\"l\"> Nov\u00e9 pokyny pro p\u0159evod typu float na int, kter\u00e9 nam\u00edsto generov\u00e1n\u00ed v\u00fdjimky p\u0159i p\u0159ekro\u010den\u00ed v\u00fdsledku vracej\u00ed minim\u00e1ln\u00ed nebo maxim\u00e1ln\u00ed mo\u017en\u00e9 hodnoty (nutn\u00e9 pro SIMD).\n<li class=\"l\"> Pokyny pro roz\u0161\u00ed\u0159en\u00ed znam\u00e9nka celo\u010d\u00edseln\u00fdch hodnot (zv\u011bt\u0161en\u00ed po\u010dtu bit\u016f \u010d\u00edsla p\u0159i zachov\u00e1n\u00ed znam\u00e9nka a hodnoty).\n<li class=\"l\"> Podpora vracen\u00ed v\u00edce hodnot bloky a funkcemi (krom\u011b p\u0159ed\u00e1v\u00e1n\u00ed v\u00edce parametr\u016f do funkc\u00ed).\n<li class=\"l\"> Implementace funkc\u00ed JavaScript BigInt64Array a BigUint64Array pro p\u0159evod mezi typem BigInt v JavaScriptu a reprezentac\u00ed 64-bitov\u00fdch cel\u00fdch \u010d\u00edsel ve WebAssembly.\n<li class=\"l\"> Podpora referen\u010dn\u00edch typ\u016f (funcref a externref) a s nimi spojen\u00fdch instrukc\u00ed (select, ref.null, ref.func a ref.is_null).\n<li class=\"l\"> Instrukce memory.copy, memory.fill, memory.init a data.drop pro kop\u00edrov\u00e1n\u00ed dat mezi oblastmi pam\u011bti a \u010di\u0161t\u011bn\u00ed pam\u011b\u0165ov\u00fdch oblast\u00ed.\n<li class=\"l\"> Instrukce pro p\u0159\u00edm\u00fd p\u0159\u00edstup a zm\u011bnu tabulek (table.set, table.get, table.size, table.grow). Mo\u017enost vytv\u00e1\u0159en\u00ed, importu a exportu n\u011bkolika tabulek v jednom modulu. Funkce kop\u00edrov\u00e1n\u00ed\/napln\u011bn\u00ed tabulek v d\u00e1vkov\u00e9m re\u017eimu (table.copy, table.init a elem.drop).            <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57052\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c W3C \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0447\u0435\u0440\u043d\u043e\u0432\u043e\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043d\u043e\u0432\u043e\u0439 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0438\u0437\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0439 \u043a\u043e\u0434 WebAssembly 2.0 \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0439 \u0441 \u043d\u0438\u043c API, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u0438\u043c\u044b\u0435 \u043c\u0435\u0436\u0434\u0443 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u043c\u0438 \u0438 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u044b\u043c\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u043c\u0438. WebAssembly \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u043d\u0435 \u0437\u0430\u0432\u0438\u0441\u044f\u0449\u0438\u0439 \u043e\u0442 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u044b\u0439 \u043d\u0438\u0437\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0439 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0439 \u043a\u043e\u0434 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439, \u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u044f\u0437\u044b\u043a\u043e\u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u0411\u043b\u0430\u0433\u043e\u0434\u0430\u0440\u044f \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u044e JIT \u0434\u043b\u044f WebAssembly \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0431\u043b\u0438\u0437\u043a\u043e\u0433\u043e [&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-103828","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c W3C 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