Den franske matematikern Fabrice Bellard, som en g\u00e5ng grundade projekten QEMU, FFmpeg, BPG, QuickJS, TinyGL och TinyCC, har publicerat en ny JavaScript-motor f\u00f6r inbyggda system \u2014 Micro QuickJS, som kan kompilera och k\u00f6ra JavaScript-program och endast f\u00f6rbruka 10 KB RAM. Tillsammans med C-biblioteket tar motorn upp ungef\u00e4r 100 KB permanent minne. Kompilering av JavaScript till bytekod och separat k\u00f6rning av bytekoden \u00e4r m\u00f6jlig. Projektets kod \u00e4r skriven i C och distribueras under MIT-licensen. <\/p>\n
Motorn st\u00f6der en delm\u00e4ngd av JavaScript-spr\u00e5ket som ligger n\u00e4ra specifikationen ECMAScript 5 (ES2019), men st\u00e4ller h\u00f6gre krav p\u00e5 koden och till\u00e5ter inte anv\u00e4ndning av vissa ineffektiva eller felaktiga JavaScript-konstruktioner. Till exempel m\u00e5ste globala variabler alltid deklareras med nyckelordet \u00abvar\u00bb, anv\u00e4ndning av \u00abwith\u00bb \u00e4r f\u00f6rbjudet, arrayer f\u00e5r inte ha luckor, och initialisering vid deklaration av typen \u00abnew Number(1)\u00bb \u00e4r inte m\u00f6jlig, likas\u00e5 \u00e4r det inte m\u00f6jligt att n\u00e5 lokala variabler fr\u00e5n eval. <\/p>\n
Prestandan f\u00f6r Micro QuickJS \u00e4r n\u00e4ra QuickJS-motorn, som har utvecklats av Fabrice sedan 2019. I Micro QuickJS anv\u00e4nds delar av koden fr\u00e5n QuickJS, men arkitekturen \u00e4r i m\u00e5nga avseenden annorlunda och utformad f\u00f6r minimalt minnesutnyttjande. Till exempel anv\u00e4nder Micro QuickJS en sp\u00e5rande skr\u00e4pinsamlar, medan QuickJS anv\u00e4nder referensr\u00e4kning. \u00d6verheaden f\u00f6r skr\u00e4pinsamlingssystemet \u00e4r bara n\u00e5gra bitar per allokerad minnesblock. F\u00f6r minnesallokering anv\u00e4nds en egen allokerare som inte \u00e4r beroende av den biblioteksfunktionen malloc(). <\/p>\n
Andra skillnader fr\u00e5n QuickJS: den anv\u00e4nder inte stackar virtuell maskin<\/a>; och en annan intern representation av objekt; lagring av str\u00e4ngar i UTF-8-kodning; generering av standardbiblioteket vid kompilering och lagring av det i permanent minne, vilket skapar endast n\u00e5gra objekt i RAM; en parser n\u00e4ra QuickJS, men utan rekursion; kombinera generering av bytekod och optimering i ett enda pass (QuickJS har flera pass f\u00f6r optimering). \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\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\udd47Grundaren av QEMU och FFmpeg har publicerat JavaScript-motorn Micro QuickJS | ProHoster","description":"Den franske matematikern Fabrice Bellard, som grundade projekten QEMU, FFmpeg, BPG, QuickJS, TinyGL och TinyCC, har publicerat en ny JavaScript-motor f\u00f6r inb\u00e4ddade system - 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K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"