{"id":79719,"date":"2020-04-29T19:42:30","date_gmt":"2020-04-29T17:42:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly"},"modified":"2020-04-29T19:42:30","modified_gmt":"2020-04-29T17:42:30","slug":"razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","title":{"rendered":"Gli sviluppatori di V8 hanno presentato un decompilatore per WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Sviluppatori del motore JavaScript V8 hanno presentato<\/a><\/noindex> utilit\u00e0 wasm-decompile<\/a><\/noindex>, che consente di decompilare una rappresentazione binaria intermedia WebAssembly<\/a><\/noindex> in un linguaggio pseudomimico leggibile, simile a JavaScript e C. Il linguaggio pseudomimico proposto \u00e8 notevolmente pi\u00f9 semplice da comprendere e pi\u00f9 adatto per l'analisi manuale rispetto alla rappresentazione testuale di WebAssembly in formato , che \u00e8 pi\u00f9 vicino all'assembly che ai linguaggi di alto livello. La decompilazione riflette quindi, per quanto possibile, la rappresentazione di Wasm.<\/p>\n

Decompilatore \u00e8 attivato<\/a><\/noindex> nella suite di strumenti WABT<\/a><\/noindex>, che fornisce la traduzione tra le rappresentazioni binarie e testuali di WebAssembly, oltre a analisi, elaborazione, modifica e verifica dei file wasm. All'interno di WABT si sviluppa anche l'utilit\u00e0 wasm2c<\/a><\/noindex>, che consente di decompilare file wasm in codice equivalente in linguaggio C, che pu\u00f2 essere compilato da un compilatore C, ma in termini di leggibilit\u00e0 non si distingue molto dalla rappresentazione testuale .<\/p>\n

Ad esempio, la funzione C originaria compilata in wasm<\/p>\n

typedef struct { float x, y, z; } vec3;<\/p>\n

float dot(const vec3 *a, const vec3 *b) {
\n return a->x * b->x +
\n a->y * b->y +
\n a->z * b->z;
\n }<\/p>\n

verr\u00e0 decompilata dall'utilit\u00e0 wasm-decompile in un linguaggio pseudo<\/p>\n

function dot(a:{ a:float, b:float, c:float },
\n b:{ a:float, b:float, c:float }):float {
\n return a.a * b.a + a.b * b.b + a.c * b.c
\n }<\/p>\n

mentre la conversione in formato testuale apparir\u00e0 nel seguente modo<\/p>\n

(func $dot (type 0) (param i32 i32) (result f32)
\n (f32.add
\n (f32.add
\n (f32.mul
\n (f32.load
\n (local.get 0))
\n (f32.load
\n (local.get 1)))
\n (f32.mul
\n (f32.load offset=4
\n (local.get 0))
\n (f32.load offset=4
\n (local.get 1))))
\n (f32.mul
\n (f32.load offset=8
\n (local.get 0))
\n (f32.load offset=8
\n (local.get 1))))))<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-79719","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\udd47Gli sviluppatori di V8 hanno presentato un decompilatore per WebAssembly | ProHoster","description":"Gli sviluppatori del motore JavaScript V8 hanno presentato 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