{"id":121335,"date":"2025-01-14T09:46:13","date_gmt":"2025-01-14T07:46:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-emscripten-4-0-kompilyator-iz-c-c-v-webassembly"},"modified":"2025-01-14T09:46:13","modified_gmt":"2025-01-14T07:46:13","slug":"dostupen-emscripten-4-0-kompilyator-iz-c-c-v-webassembly","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/dostupen-emscripten-4-0-kompilyator-iz-c-c-v-webassembly","title":{"rendered":"Emscripten 4.0 \u00e8 disponibile, un compilatore da C\/C++ a WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stato rilasciato il toolkit Emscripten 4.0, che consente di compilare codice in C\/C++ e in altri linguaggi per i quali sono disponibili frontend basati su LLVM, in un codice intermedio universale a livello basso chiamato WebAssembly. Il risultato ottenuto pu\u00f2 essere utilizzato per integrazioni con progetti JavaScript, per l'esecuzione nei browser web, in Node.js o per la creazione di applicazioni multidispositivo autonome gestite da un runtime wasm. Il codice del progetto \u00e8 distribuito con licenza MIT. Il compilatore si basa sui contributi del progetto LLVM, e per la generazione di WebAssembly e l'ottimizzazione viene utilizzata la libreria Binaryen.    <\/p>\n<p>L'obiettivo principale di Emscripten \u00e8 dichiarato come la creazione di uno strumento che consenta di eseguire codice nel Web indipendentemente dal linguaggio di programmazione in cui \u00e8 stato originariamente scritto. Nelle applicazioni compilate possono essere utilizzate chiamate alle librerie standard di C e C++ (libc, libcxx), estensioni C++, multithreading basato su pthreads, API POSIX e molte librerie multimediali. Vengono forniti anche API per l'integrazione con le API Web e il codice JavaScript.    <\/p>\n<p>Emscripten supporta la traduzione dell'output della libreria SDL2 attraverso Canvas e implementa anche il supporto per OpenGL e EGL tramite l'API WebGL, permettendo di convertire in WebAssembly applicazioni grafiche e giochi (ad esempio, \u00e8 disponibile un porting del toolkit Qt, supportando i motori di gioco Unreal Engine e Unity, oltre al motore di simulazione fisica Bullet).     <\/p>\n<p>Oltre alla compilazione di codice C\/C++, vengono sviluppati progetti separati per eseguire nel browser interpreti per <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/vps\/\"   title=\"di macchine virtuali\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2133\">di macchine virtuali<\/a> linguaggi come Lua, C#, Python, Ruby e Perl. Inoltre, \u00e8 possibile applicare front-end a LLVM che non siano Clang, ad esempio, front-end per linguaggi come Swift, Rust, D e Fortran.      <\/p>\n<p>L'assegnazione della versione 4.0 \u00e8 collegata a modifiche che interrompono la compatibilit\u00e0 a livello ABI (recompile dei file oggetto e delle librerie create con le versioni precedenti di Emscripten sar\u00e0 necessaria quando si ricompila il progetto in Emscripten 4.0). Le principali modifiche in Emscripten 4.0 includono:  <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione &#171;-sWASM_LEAGCY_EXCEPTIONS&#187; per scegliere tra i vecchi e i nuovi meccanismi di gestione delle eccezioni. Per impostazione predefinita, continua a essere utilizzato il vecchio meccanismo, poich\u00e9 non tutti i browser hanno implementato le funzionalit\u00e0 di WebAssembly per gestire i nuovi gestori di eccezioni.\n<li class=\"l\"> I componenti compiler-rt, libcxx, libcxxabi e libunwind sono stati aggiornati alla branch LLVM 19.\n<li class=\"l\"> La versione minima supportata del browser Safari (impostazione MIN_SAFARI_VERSION) \u00e8 stata aumentata da 14.1 a 15.0, consentendo di attivare per impostazione predefinita diverse funzionalit\u00e0 avanzate di WebAssembly:\n<ul>\n<li class=\"l\"> \u00c8 stato incluso l'uso di nuove istruzioni per la conversione di tipo float in int (nontrapping-fptoint), 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\"> \u00c8 stata introdotta l'opzione WASM_BIGINT, in cui per lo scambio di valori interi a 64 bit tra WebAssembly e codice JavaScript viene applicato il tipo BigInt.\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione BULK_MEMORY, in cui per implementare le funzioni C memcpy e memset vengono utilizzate le istruzioni WebAssembly memory.copy e memory.fill.    <\/ul>\n<li class=\"l\"> Nella funzione PATH.basename() \u00e8 disabilitata la normalizzazione dei percorsi (PATH.normalize()), ovvero la chiamata &#8216;PATH.basename(&#171;a\/.&#187;)&#8217; restituir\u00e0 &#171;.&#187; invece di &#171;a&#187;, mentre &#8216;PATH.basename(&#171;a\/b\/..&#187;)&#8217; restituir\u00e0 &#171;..&#187; invece di &#171;a&#187;.\n<li class=\"l\"> Quando si utilizza l'opzione &#171;-sMODULARIZE&#187;, le funzioni factory che creano e restituiscono istanze di moduli e oggetti WebAssembly per JavaScript sono ora contrassegnate con l'attributo &#171;async&#187; durante la compilazione in modalit\u00e0 WASM_ASYNC_COMPILATION, che \u00e8 applicata per impostazione predefinita.\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di specificare librerie JavaScript utilizzando l'opzione &#171;-lfoo.js&#187;. Diversamente dall'opzione &#171;&#8212;js-library&#187;, la ricerca della libreria avviene in tutti i percorsi specificati tramite l'opzione &#171;-L&#187;.\n<li class=\"l\"> Quando si compila in modalit\u00e0 di debug (-O0 o -sASSERTIONS), per impostazione predefinita viene attivata una variante di debug della funzione malloc con controlli assert abilitati, che individuano errori come chiamate doppie alla funzione free().        <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62553\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f Emscripten 4.0, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 C\/C++ \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u044f\u0437\u044b\u043a\u0430\u0445, \u0434\u043b\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u0444\u0440\u043e\u043d\u0442\u044d\u043d\u0434\u044b \u043d\u0430 \u0431\u0430\u0437\u0435 LLVM, \u0432 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u044b\u0439 \u043d\u0438\u0437\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0439 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0439 \u043a\u043e\u0434 WebAssembly. \u041f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u0438 \u0441 JavaScript-\u043f\u0440\u043e\u0435\u043a\u0442\u0430\u043c\u0438, \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0432 web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0435, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 Node.js \u0438\u043b\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043e\u0431\u043e\u0441\u043e\u0431\u043b\u0435\u043d\u043d\u044b\u0445 \u043c\u043d\u043e\u0433\u043e\u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435\u043d\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 wasm runtime. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 [&hellip;]<\/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-121335","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f Emscripten 4.0, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 C\/C++ \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u044f\u0437\u044b\u043a\u0430\u0445, 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