Il matematico francese Fabrice Bellard, che ha fondato 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 consumando solo 10 KB di RAM. Insieme alla libreria C, il motore occupa circa 100 KB di memoria permanente. \u00c8 possibile compilare JavaScript in bytecode e eseguire separatamente il bytecode. Il codice del progetto \u00e8 scritto in linguaggio C e distribuito sotto licenza MIT. <\/p>\n
Il motore supporta un sottoinsieme del linguaggio JavaScript, simile alla specifica ECMAScript 5 (ES2019), ma impone requisiti pi\u00f9 rigorosi sul codice e non consente l'uso di alcune costruzioni JavaScript inefficaci o soggette a errori. Ad esempio, le variabili globali devono essere dichiarate con la parola chiave \u00abvar\u00bb, \u00e8 vietato l'uso di \u00abwith\u00bb, gli array non possono avere spazi vuoti, non \u00e8 possibile l'inizializzazione alla dichiarazione come \u00abnew Number(1)\u00bb, e l'accesso alle variabili locali tramite eval \u00e8 impossibile. <\/p>\n
Le prestazioni di Micro QuickJS sono paragonabili a quelle del motore QuickJS, sviluppato da Fabrice dal 2019. Micro QuickJS utilizza parte del codice di QuickJS, ma l'architettura \u00e8 molto diversa ed \u00e8 progettata per un consumo minimo di memoria. Ad esempio, Micro QuickJS implementa un garbage collector tracciante, mentre QuickJS utilizza il conteggio dei riferimenti. Il sovraccarico del garbage collector \u00e8 di soli pochi bit per ogni blocco di memoria allocato. Per l'allocazione della memoria viene utilizzato un allocatore proprietario, indipendente dalla funzione di libreria malloc(). <\/p>\n
Altre differenze rispetto a QuickJS: non utilizza lo stack; ha una diversa rappresentazione interna degli oggetti; memorizza le stringhe in codifica UTF-8; genera la libreria standard durante la compilazione e la memorizza in memoria permanente creando in RAM solo pochi oggetti; il parser \u00e8 simile a QuickJS, ma non utilizza la ricorsione; combina in un'unica passata la generazione di bytecode e l'ottimizzazione (in QuickJS ci sono pi\u00f9 passaggi per l'ottimizzazione). la macchina virtuale<\/a>; altra rappresentazione interna degli oggetti; memorizzazione delle stringhe in codifica UTF-8; generazione della libreria standard durante la compilazione e sua memorizzazione in memoria permanente con creazione in RAM di soli pochi oggetti; parser simile a QuickJS, ma senza utilizzo della ricorsione; unione in un'unica passata di generazione del bytecode e ottimizzazione (in QuickJS ci sono pi\u00f9 passate 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-novosti-interneta"],"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: Micro QuickJS, in grado di compilare ed eseguire programmi JavaScript consumando solo 10 KB di RAM. Insieme alla libreria C, il motore occupa circa 100 KB di memoria permanente. \u00c8 possibile compilare JavaScript in bytecode e lanciare separatamente il bytecode.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-micro-quickjs","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"