Il matematico francese Fabrice Bellard, che ha creato in passato progetti come QEMU, FFmpeg, BPG, QuickJS, TinyGL e TinyCC, ha pubblicato un nuovo motore JavaScript per sistemi embedded \u2014 Micro QuickJS, in grado di compilare ed eseguire programmi JavaScript, utilizzando solo 10 KB di RAM. Insieme alla libreria in C, il motore occupa circa 100 KB di memoria permanente. \u00c8 possibile compilare JavaScript in bytecode e lanciare il bytecode separatamente. Il codice del progetto \u00e8 scritto in C e viene distribuito con licenza MIT. <\/p>\n
Il motore supporta un sottoinsieme del linguaggio JavaScript, vicino alla specifica ECMAScript 5 (ES2019), ma richiede codice pi\u00f9 rigoroso e non consente l'uso di alcune costruzioni JavaScript inefficaci o soggette a errori. Ad esempio, le variabili globali devono essere necessariamente dichiarate con la parola chiave \"var\", \u00e8 vietato utilizzare \"with\", gli array non possono contenere elementi vuoti, e non \u00e8 possibile l'inizializzazione con dichiarazioni come \"new Number(1)\"; da eval non \u00e8 possibile accedere alle variabili locali. <\/p>\n
Le prestazioni di Micro QuickJS sono simili a quelle del motore QuickJS, sviluppato da Fabrice dal 2019. Micro QuickJS utilizza parte del codice del motore QuickJS, ma l'architettura \u00e8 molto diversa ed \u00e8 progettata per un consumo minimo di memoria. Ad esempio, Micro QuickJS utilizza un garbage collector a tracciamento, mentre QuickJS \u00e8 basato su conteggio dei riferimenti. Le spese generali del garbage collector ammontano a pochi bit per ogni blocco di memoria allocato. Per l'allocazione della memoria viene utilizzato un allocatore personalizzato, indipendente dalla funzione di libreria malloc(). <\/p>\n
Altre differenze rispetto a QuickJS: non utilizza lo stack macchina virtuale<\/a>; una rappresentazione interna degli oggetti diversa; memorizzazione delle stringhe in codifica UTF-8; generazione della libreria standard durante la compilazione e la conservazione in memoria permanente con la creazione in RAM di solo pochi oggetti; un parser simile a QuickJS, ma che non utilizza la ricorsione; combinazione in un'unica passata della generazione di bytecode e ottimizzazione (in QuickJS ci sono pi\u00f9 passaggi per l'ottimizzazione). \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\udd47Il fondatore di QEMU e FFmpeg ha pubblicato il motore JavaScript Micro QuickJS | ProHoster","description":"Il matematico francese Fabrice Bellard, fondatore di progetti come QEMU, FFmpeg, BPG, QuickJS, TinyGL e TinyCC, ha pubblicato un nuovo motore JavaScript per sistemi embedded - 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"