{"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\/pt\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","title":{"rendered":"O fundador do QEMU e FFmpeg publicou o motor JavaScript QuickJS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>O matem\u00e1tico franc\u00eas Fabrice Bellard, que fundou projetos como QEMU e FFmpeg, al\u00e9m de criar a f\u00f3rmula mais r\u00e1pida para calcular o n\u00famero Pi e desenvolver um formato de imagem <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41198\">BPG<\/a><\/noindex>, publicou o primeiro lan\u00e7amento de um novo motor JavaScript <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/\">QuickJS<\/a><\/noindex>. O motor se destaca pela sua compacta\u00e7\u00e3o e \u00e9 voltado para a incorpora\u00e7\u00e3o em outros sistemas. O c\u00f3digo do projeto \u00e9 escrito em C e \u00e9 distribu\u00eddo sob a licen\u00e7a MIT. Tamb\u00e9m est\u00e1 dispon\u00edvel uma vers\u00e3o do motor compilada em WebAssembly usando Emscripten, adequada para execu\u00e7\u00e3o em navegadores.<\/p>\n<p>A implementa\u00e7\u00e3o de JavaScript <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/quickjs.html\">suporta<\/a><\/noindex> segue a especifica\u00e7\u00e3o ES2019, incluindo m\u00f3dulos, geradores ass\u00edncronos e proxies. Suportam opcionalmente recursos matem\u00e1ticos n\u00e3o padr\u00e3o <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/jsbignum.html\">para desenvolvimento remoto no VS Code (VS Code Remote \u2014 WSL) \u00e9 a \u00faltima etapa que garante um trabalho confort\u00e1vel para o desenvolvedor. A extens\u00e3o permite que o VS Code execute todas as suas opera\u00e7\u00f5es (comandos git, console, instala\u00e7\u00e3o de extens\u00f5es e assim por diante) interagindo diretamente com a m\u00e1quina virtual Linux. Isso torna todo o processo muito aut\u00f4nomo.<\/a><\/noindex> para JavaScript, como os tipos BigInt e BigFloat, al\u00e9m de <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\">sobrecarga de operadores<\/a><\/noindex>. Em termos de desempenho, o QuickJS supera significativamente <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/bench.html\">significativamente<\/a><\/noindex> os motores existentes; por exemplo, no teste<br \/>\n bench-v8, \u00e9 sete vezes mais r\u00e1pido que o motor <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Moddable-OpenSource\/moddable\">XS<\/a><\/noindex> em 35%, <noindex><a rel=\"nofollow\" href=\"https:\/\/duktape.org\/\">DukTape<\/a><\/noindex> mais de duas vezes, <noindex><a rel=\"nofollow\" href=\"http:\/\/jerryscript.net\/\">JerryScript<\/a><\/noindex> tr\u00eas vezes, e <noindex><a rel=\"nofollow\" href=\"https:\/\/mujs.com\/\">MuJS<\/a><\/noindex> .<\/p>\n<p>Al\u00e9m da biblioteca para embutir o motor em aplica\u00e7\u00f5es, o projeto tamb\u00e9m oferece um interpretador qjs, que pode ser utilizado para executar c\u00f3digo JavaScript a partir da linha de comando. Al\u00e9m disso, est\u00e1 dispon\u00edvel um compilador qjsc, que pode gerar arquivos execut\u00e1veis independentes que n\u00e3o requerem depend\u00eancias externas. <\/p>\n<p>Principais caracter\u00edsticas:<\/p>\n<ul>\n<li class=\"l\"> Compacta\u00e7\u00e3o e facilidade de integra\u00e7\u00e3o em outros projetos. O c\u00f3digo consiste em apenas alguns arquivos em C, que n\u00e3o exigem depend\u00eancias externas para a constru\u00e7\u00e3o. Um aplicativo simples compilado ocupa cerca de 190 KB;\n<li class=\"l\"> Desempenho muito alto e baixo tempo de inicializa\u00e7\u00e3o. A passagem de 56 mil testes de compatibilidade com ECMAScript leva cerca de 100 segundos ao ser executada em um \u00fanico n\u00facleo de um PC desktop comum. A inicializa\u00e7\u00e3o do runtime leva menos de 300 microsegundos;\n<li class=\"l\"> Quase total compatibilidade com a especifica\u00e7\u00e3o ES2019 e total suporte para o aplicativo &#171;B&#187;, que define componentes para compatibilidade com aplicativos web antigos;\n<li class=\"l\"> Cumprimento completo de todos os testes do conjunto ECMAScript Test Suite;\n<li class=\"l\"> Suporte \u00e0 compila\u00e7\u00e3o de c\u00f3digo JavaScript em arquivos execut\u00e1veis sem depend\u00eancias externas;\n<li class=\"l\"> Um coletor de lixo baseado em contagem de refer\u00eancias sem execu\u00e7\u00e3o de limpeza c\u00edclica, permitindo um comportamento previs\u00edvel e redu\u00e7\u00e3o do consumo de mem\u00f3ria;\n<li class=\"l\"> Um conjunto de extens\u00f5es para c\u00e1lculos matem\u00e1ticos em JavaScript;\n<li class=\"l\"> Shell para execu\u00e7\u00e3o de c\u00f3digo no modo de linha de comando, com suporte a destaque de sintaxe;\n<li class=\"l\"> Biblioteca padr\u00e3o compacta com wrappers sobre a biblioteca C.\n<\/ul>\n<p>O projeto tamb\u00e9m desenvolve tr\u00eas bibliotecas C auxiliares, usadas no QuickJS e adequadas para uso independente: <\/p>\n<ul>\n<li class=\"l\"> libregexp \u2014 uma implementa\u00e7\u00e3o r\u00e1pida de express\u00f5es regulares, completamente compat\u00edvel com a especifica\u00e7\u00e3o Javascript ES 2019;\n<li class=\"l\"> libunicode \u2014 uma biblioteca compacta para trabalhar com Unicode;\n<li class=\"l\"> libbf \u2014 implementa\u00e7\u00e3o de opera\u00e7\u00f5es de ponto flutuante de precis\u00e3o arbitr\u00e1ria e fun\u00e7\u00f5es transcendentes com arredondamento exato.\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 5.0.3 - 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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