{"id":103828,"date":"2022-04-20T15:37:16","date_gmt":"2022-04-20T13:37:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-predvaritelnyj-variant-standarta-webassembly-2-0"},"modified":"2022-04-20T15:37:16","modified_gmt":"2022-04-20T13:37:16","slug":"dostupen-predvaritelnyj-variant-standarta-webassembly-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/dostupen-predvaritelnyj-variant-standarta-webassembly-2-0","title":{"rendered":"\u00c8 disponibile una versione preliminare dello standard WebAssembly 2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il consorzio W3C ha pubblicato una bozza della nuova specifica che standardizza il codice intermedio WebAssembly 2.0 e il relativo API, consentendo la creazione di applicazioni ad alte prestazioni, portabili tra browser e piattaforme hardware. WebAssembly fornisce un codice intermedio universale a basso livello, indipendente dal browser, per l'esecuzione di applicazioni compilate da vari linguaggi di programmazione. Grazie all'implementazione di JIT per WebAssembly, \u00e8 possibile raggiungere livelli di prestazioni vicini al codice nativo.      <\/p>\n<p>La tecnologia WebAssembly pu\u00f2 essere utilizzata per eseguire nel browser compiti che richiedono elevate prestazioni, come la codifica video, l'elaborazione audio, la manipolazione grafica e 3D, lo sviluppo di giochi, operazioni crittografiche e calcoli matematici, attraverso l'esecuzione nel browser di codice scritto in linguaggi compilabili come C\/C++.        <\/p>\n<p>Tra i principali obiettivi di WebAssembly ci sono la portabilit\u00e0, la prevedibilit\u00e0 del comportamento e l'identit\u00e0 dell'esecuzione del codice su diverse piattaforme. Ultimamente, WebAssembly \u00e8 stato anche proposto come una piattaforma universale per l'esecuzione sicura del codice su qualsiasi infrastruttura, sistema operativo e dispositivo, senza limitarsi ai browser.        <\/p>\n<p>Il W3C ha pubblicato tre specifiche preliminari di WebAssembly 2.0:  <\/p>\n<ul>\n<li class=\"l\">  WebAssembly Core &#8212; descrive una macchina virtuale a basso livello per l'esecuzione di codice intermedio WebAssembly. Le risorse correlate a WebAssembly sono fornite nel formato &#171;.wasm&#187;, simile ai file &#171;.class&#187; in Java e contengono dati statici e segmenti di codice per lavorare con questi dati.   <\/li>\n<li class=\"l\"> WebAssembly JavaScript Interface &#8212; fornisce un'API per l'integrazione con JavaScript. Consente di ottenere valori e passare parametri alle funzioni WebAssembly. L'esecuzione di WebAssembly \u00e8 conforme al modello di sicurezza di JavaScript e tutte le interazioni con il sistema principale avvengono in modo simile all'esecuzione di codice JavaScript.      <\/li>\n<li class=\"l\">  WebAssembly Web API &#8212; definisce un'interfaccia di programmazione basata sul meccanismo Promise per richiedere ed eseguire risorse &#171;.wasm&#187;. Il formato delle risorse WebAssembly \u00e8 ottimizzato per l'avvio dell'esecuzione senza dover attendere il caricamento completo del file, migliorando cos\u00ec la reattivit\u00e0 delle applicazioni web.  <\/ul>\n<p>Le principali modifiche in WebAssembly 2.0 rispetto alla prima versione dello standard:    <\/p>\n<ul>\n<li class=\"l\"> Supporto per il tipo vettoriale v128 e le relative istruzioni vettoriali, che consentono di eseguire azioni su pi\u00f9 valori numerici contemporaneamente (SIMD, single instruction multiple data).\n<li class=\"l\"> Possibilit\u00e0 di importare ed esportare variabili globali modificabili (mutable), consentendo l'applicazione di legami globali per valori come puntatori allo stack in C++.\n<li class=\"l\"> Nuove istruzioni per la conversione di tipo float in int, che invece di generare un'eccezione in caso di overflow del risultato restituiscono il valore minimo o massimo possibile (necessario per SIMD).\n<li class=\"l\"> Istruzioni per l'estensione del segno di numeri interi (aumento della larghezza del numero mantenendo il segno e il valore).\n<li class=\"l\"> Supporto per restituire pi\u00f9 valori attraverso blocchi e funzioni (in aggiunta al passaggio di pi\u00f9 parametri alle funzioni).\n<li class=\"l\"> Implementazione delle funzioni JavaScript BigInt64Array e BigUint64Array per la conversione tra il tipo BigInt di JavaScript e la rappresentazione di numeri interi a 64 bit in WebAssembly.\n<li class=\"l\"> Supporto per i tipi di riferimento (funcref ed externref) e le istruzioni correlate (select, ref.null, ref.func e ref.is_null).\n<li class=\"l\"> Istruzioni memory.copy, memory.fill, memory.init e data.drop per copiare dati tra aree di memoria e pulire regioni di memoria.\n<li class=\"l\"> Istruzioni per l'accesso diretto e la modifica delle tabelle (table.set, table.get, table.size, table.grow). Possibilit\u00e0 di creare, importare ed esportare pi\u00f9 tabelle in un unico modulo. Funzioni di copia\/pieno delle tabelle in modalit\u00e0 batch (table.copy, table.init e elem.drop).            <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57052\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c W3C \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0447\u0435\u0440\u043d\u043e\u0432\u043e\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043d\u043e\u0432\u043e\u0439 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0438\u0437\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0439 \u043a\u043e\u0434 WebAssembly 2.0 \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0439 \u0441 \u043d\u0438\u043c API, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u0438\u043c\u044b\u0435 \u043c\u0435\u0436\u0434\u0443 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u043c\u0438 \u0438 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u044b\u043c\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u043c\u0438. 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WebAssembly fornisce un codice intermedio universale a basso livello indipendente dal browser per eseguire applicazioni compilate da diversi linguaggi di programmazione. 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