El matem\u00e1tico franc\u00e9s Fabrice Bellard, fundador de proyectos como QEMU, FFmpeg, BPG, QuickJS, TinyGL y TinyCC, ha publicado un nuevo motor de JavaScript para sistemas embebidos \u2014 Micro QuickJS, capaz de compilar y ejecutar programas JavaScript, consumiendo solo 10 KB de RAM. Junto con la biblioteca en C, el motor ocupa aproximadamente 100 KB de memoria permanente. Es posible compilar JavaScript en bytecode y ejecutar el bytecode por separado. El c\u00f3digo del proyecto est\u00e1 escrito en lenguaje C y se distribuye bajo la licencia MIT. <\/p>\n
El motor soporta un subconjunto del lenguaje JavaScript, cercano a la especificaci\u00f3n ECMAScript 5 (ES2019), pero presenta requisitos m\u00e1s estrictos para el c\u00f3digo y no permite el uso de algunas construcciones de JavaScript ineficientes o propensas a errores. Por ejemplo, las variables globales deben declararse obligatoriamente con la palabra clave \u00abvar\u00bb, se proh\u00edbe el uso de \u00abwith\u00bb, los arreglos no pueden tener huecos, y no es posible la inicializaci\u00f3n con declaraciones como \u00abnew Number(1)\u00bb; adem\u00e1s, no se puede acceder a variables locales desde eval. <\/p>\n
El rendimiento de Micro QuickJS es similar al del motor QuickJS, que Fabrice ha estado desarrollando desde 2019. Micro QuickJS utiliza parte del c\u00f3digo del motor QuickJS, pero su arquitectura difiere en gran medida y est\u00e1 dise\u00f1ada para un consumo m\u00ednimo de memoria. Por ejemplo, Micro QuickJS emplea un recolector de basura por seguimiento, mientras que QuickJS utiliza conteo de referencias. Los costos de dicho recolector de basura son \u00fanicamente unos pocos bits por cada bloque de memoria asignado. Se utiliza un asignador propio para la gesti\u00f3n de memoria, que no depende de la funci\u00f3n de biblioteca malloc(). <\/p>\n
Otras diferencias respecto a QuickJS: no utiliza pila m\u00e1quina virtual<\/a>; diferente representaci\u00f3n interna de los objetos; almacenamiento de cadenas en codificaci\u00f3n UTF-8; generaci\u00f3n de la biblioteca est\u00e1ndar durante la compilaci\u00f3n y su almacenamiento en memoria permanente con la creaci\u00f3n en RAM de solo unos pocos objetos; un analizador similar a QuickJS, pero que no utiliza recursi\u00f3n; combinaci\u00f3n en una sola pasada de la generaci\u00f3n de c\u00f3digo de bytes y optimizaci\u00f3n (QuickJS realiza m\u00faltiples pasadas para optimizaci\u00f3n). \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\u0451 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU, FFmpeg, BPG, QuickJS, TinyGL \u0438 TinyCC, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043d\u043e\u0432\u044b\u0439 JavaScript-\u0434\u0432\u0438\u0436\u043e\u043a \u0434\u043b\u044f \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c — Micro QuickJS, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0439 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c JavaScript-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b, \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u044f\u044f \u0432\u0441\u0435\u0433\u043e 10 \u041a\u0411 \u041e\u0417\u0423. \u0412\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u043e\u0439 \u0434\u0432\u0438\u0436\u043e\u043a \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 100 \u041a\u0411 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0446\u0438\u044f JavaScript \u0432 \u0431\u0430\u0439\u0442\u043a\u043e\u0434 \u0438 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u0437\u0430\u043f\u0443\u0441\u043a […]<\/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-152471","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47El fundador de QEMU y FFmpeg ha publicado el motor de JavaScript Micro QuickJS | ProHoster","description":"El matem\u00e1tico franc\u00e9s Fabrice Bellard, quien en su momento fund\u00f3 proyectos como QEMU, FFmpeg, BPG, QuickJS, TinyGL y TinyCC, ha publicado un nuevo motor de JavaScript para sistemas incrustados: Micro QuickJS.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-micro-quickjs","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0441\u043d\u043e\u0432\u0430\u0442\u0435\u043b\u044c QEMU \u0438 FFmpeg \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b JavaScript-\u0434\u0432\u0438\u0436\u043e\u043a Micro QuickJS | ProHoster","og:description":"\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\u0451 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU, FFmpeg, BPG, QuickJS, TinyGL \u0438 TinyCC, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043d\u043e\u0432\u044b\u0439 JavaScript-\u0434\u0432\u0438\u0436\u043e\u043a \u0434\u043b\u044f \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c - 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"