Den franske matematikeren Fabrice Bellard, som en gang startet prosjektene QEMU, FFmpeg, BPG, QuickJS, TinyGL og TinyCC, har publisert en ny JavaScript-motor for innebygde systemer \u2014 Micro QuickJS, som kan kompilere og kj\u00f8re JavaScript-programmer med bare 10 KB RAM. Sammen med C-biblioteket tar motoren omtrent 100 KB permanent minne. Det er mulig \u00e5 kompilere JavaScript til bytekode og kj\u00f8re bytekoden separat. Koden til prosjektet er skrevet i C og distribueres under MIT-lisensen. <\/p>\n
Motoren st\u00f8tter et delsett av JavaScript-spr\u00e5ket, n\u00e6rt spesifikasjonen ECMAScript 5 (ES2019), men stiller strengere krav til koden og tillater ikke bruk av visse ineffektive eller feilaktige JavaScript-strukturer. For eksempel m\u00e5 globale variabler alltid erkl\u00e6res med n\u00f8kkelordet \u00abvar\u00bb, bruken av \u00abwith\u00bb er forbudt, matriser kan ikke ha hull, og det er ikke mulig med initialisering ved deklarasjoner som \u00abnew Number(1)\u00bb, og eval kan ikke f\u00e5 tilgang til lokale variabler. <\/p>\n
Ytelsen til Micro QuickJS er n\u00e6r QuickJS-motoren, utviklet av Fabrice siden 2019. Micro QuickJS drar nytte av deler av koden fra QuickJS-motoren, men arkitekturen er mye forskjellig og designet for minimalt minneforbruk. For eksempel benytter Micro QuickJS en sporing-samler, mens QuickJS benytter referansetelling. Overheaden til s\u00f8ppelsamleren er bare noen bitt per tildelt minneblokk. En egen allocator brukes for minnetildeling, uavhengig av bibliotekets malloc()-funksjon. <\/p>\n
Andre forskjeller fra QuickJS: bruker ikke stakk en virtuell maskin<\/a>; annen intern representasjon av objekter; lagring av strenger i UTF-8-koding; generering av standardbiblioteket under kompilering og lagring av det i permanent minne, som kun oppretter noen f\u00e5 objekter i RAM; en parser som er n\u00e6r QuickJS, men som ikke bruker rekursjon; sammensl\u00e5ing av bytekodegenerering og optimalisering i ett enkelt pass (QuickJS har flere pass for optimalisering). \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\udd47Grunnleggeren av QEMU og FFmpeg har publisert JavaScript-motoren Micro QuickJS | ProHoster","description":"Den franske matematikeren Fabrice Bellard, som en gang grunnla prosjektene QEMU, FFmpeg, BPG, QuickJS, TinyGL og TinyCC, har publisert en ny JavaScript-motor for innebygde systemer - 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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"