{"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\/ro\/blog\/news\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","title":{"rendered":"Dezvoltatorii V8 au lansat un decompilator pentru WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltatorii motorului JavaScript V8 au prezentat<\/a><\/noindex> utilitar wasm-decompile<\/a><\/noindex>, care permite decompilarea unei reprezent\u0103ri binare intermediare WebAssembly<\/a><\/noindex> \u00eentr-o limbaj pseudo-lectibil, asem\u0103n\u0103tor cu JavaScript \u0219i C. Limba pseudo-propus\u0103 este semnificativ mai u\u0219or de \u00een\u021beles \u0219i mai potrivit\u0103 pentru analiza manual\u0103 dec\u00e2t reprezentarea textual\u0103 a WebAssembly \u00een formatul <.wat><\/span>, care se apropie mai mult de asamblare dec\u00e2t de limbile de nivel \u00eenalt. \u00cen acela\u0219i timp, decompilarea reflect\u0103 \u00een mod ideal reprezentarea Wasm.<\/p>\n

Decompilator inclus<\/a><\/noindex> \u00een cadrul instrumentelor WABT<\/a><\/noindex>, care asigur\u0103 transla\u021bia \u00eentre reprezent\u0103rile binare \u0219i textuale ale WebAssembly, precum \u0219i analiza, procesarea, modificarea \u0219i verificarea fi\u0219ierelor wasm. \u00cen cadrul WABT se dezvolt\u0103 de asemenea utilitarul wasm2c<\/a><\/noindex>, permi\u021b\u00e2nd decompilarea fi\u0219ierelor wasm \u00eentr-un cod echivalent \u00een limbajul C, care poate fi compilat de un compilator C, dar \u00een ceea ce prive\u0219te lizibilitatea nu se deosebe\u0219te mult de reprezentarea textual\u0103 <wat><\/span>.<\/p>\n

De exemplu, func\u021bia C compilat\u0103 \u00een 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

va fi decompilat\u0103 de utilitarul wasm-decompile \u00een pseudo-limbaj<\/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

\u00een timp ce conversia \u00een formatul textual <.wat><\/span> va ar\u0103ta astfel<\/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

Sursa: opennet.ro<\/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\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\udd47Dezvoltatorii V8 au lansat un decompilator pentru WebAssembly | ProHoster","description":"Dezvoltatorii motorului JavaScript V8 au lansat un utilitar","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","og:site_name":"ProHoster | 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