{"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\/hu\/blog\/news\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","title":{"rendered":"V8 developers introduced a decompiler for WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A V8 JavaScript-motor fejleszt\u0151i bemutatt\u00e1k<\/a><\/noindex> seg\u00e9dprogramot wasm-decompile<\/a><\/noindex>, amely lehet\u0151v\u00e9 teszi a k\u00f6ztes bin\u00e1ris reprezent\u00e1ci\u00f3 dekompil\u00e1l\u00e1s\u00e1t WebAssembly-t,<\/a><\/noindex> egy olvashat\u00f3 \u00e1lb\u00f3l \u00edr nyelvre, amely hasonl\u00edt a JavaScriptre \u00e9s a C-re. Az aj\u00e1nlott \u00e1lprogramoz\u00e1si nyelv l\u00e9nyegesen egyszer\u0171bb a meg\u00e9rt\u00e9s szempontj\u00e1b\u00f3l, \u00e9s jobban alkalmas a k\u00e9zi elemz\u00e9sre, mint a WebAssembly sz\u00f6veges \u00e1br\u00e1zol\u00e1sa «.wat» form\u00e1tumban, amely k\u00f6zelebb \u00e1ll a g\u00e9pi nyelvhez, mint a magas szint\u0171 nyelvekhez. Ekk\u00f6zben a dekompil\u00e1ci\u00f3 lehet\u0151s\u00e9g szerint teljes m\u00e9rt\u00e9kben t\u00fckr\u00f6zi a Wasm \u00e1br\u00e1zol\u00e1s\u00e1t.<\/p>\n

Dekompil\u00e1tor bekapcsolva<\/a><\/noindex> a WABT eszk\u00f6zcsomag r\u00e9szek\u00e9nt WABT<\/a><\/noindex>, amely biztos\u00edtja a WebAssembly bin\u00e1ris \u00e9s sz\u00f6veges reprezent\u00e1ci\u00f3i k\u00f6z\u00f6tti ford\u00edt\u00e1st, valamint a wasm-f\u00e1jlok elemz\u00e9s\u00e9t, feldolgoz\u00e1s\u00e1t, m\u00f3dos\u00edt\u00e1s\u00e1t \u00e9s ellen\u0151rz\u00e9s\u00e9t. A WABT keretein bel\u00fcl fejleszt\u00e9s alatt \u00e1ll egy wasm2c<\/a><\/noindex>, amely lehet\u0151v\u00e9 teszi a wasm f\u00e1jlok dekompil\u00e1l\u00e1s\u00e1t C nyelv\u0171 megfelel\u0151 k\u00f3dra, amelyet C ford\u00edt\u00f3val lehet ford\u00edtani, de olvashat\u00f3s\u00e1g szempontj\u00e1b\u00f3l nem sokban t\u00e9r el a «wat» sz\u00f6veges \u00e1br\u00e1zol\u00e1s\u00e1t\u00f3l.<\/p>\n

P\u00e9ld\u00e1ul a wasm-be ford\u00edtott C forr\u00e1sfunkci\u00f3<\/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

a wasm-decompile utilit\u00e1s \u00e1ltal az \u00e1lnyelvre dekompil\u00e1lva a k\u00f6vetkez\u0151k\u00e9ppen fog kin\u00e9zni<\/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

m\u00edg a «.wat» sz\u00f6veges form\u00e1tumra val\u00f3 \u00e1tkonvert\u00e1l\u00e1s a k\u00f6vetkez\u0151k\u00e9ppen n\u00e9zne ki<\/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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 JavaScript-\u0434\u0432\u0438\u0436\u043a\u0430 V8 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0443 wasm-decompile, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0434\u0435\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u043e\u0435 \u0431\u0438\u043d\u0430\u0440\u043d\u043e\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 WebAssembly \u0432 \u0447\u0438\u0442\u0430\u0435\u043c\u044b\u0439 \u043f\u0441\u0435\u0432\u0434\u043e\u044f\u0437\u044b\u043a, \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u044e\u0449\u0438\u0439 JavaScript \u0438 \u0421\u0438. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u043f\u0441\u0435\u0432\u0434\u043e\u044f\u0437\u044b\u043a \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u0440\u043e\u0449\u0435 \u0434\u043b\u044f \u0432\u043e\u0441\u043f\u0440\u0438\u044f\u0442\u0438\u044f \u0438 \u0431\u043e\u043b\u0435\u0435 \u043f\u0440\u0438\u0433\u043e\u0434\u0435\u043d \u0434\u043b\u044f \u0440\u0443\u0447\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u0431\u043e\u0440\u0430, \u0447\u0435\u043c \u0442\u0435\u043a\u0441\u0442\u043e\u0432\u043e\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 WebAssembly \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 «.wat», \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0431\u043b\u0438\u0436\u0435 \u043a \u0430\u0441\u0441\u0435\u043c\u0431\u043b\u0435\u0440\u0443, \u0447\u0435\u043c \u043a \u0432\u044b\u0441\u043e\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u043c \u044f\u0437\u044b\u043a\u0430\u043c. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u0434\u0435\u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0446\u0438\u044f \u043f\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0442\u0440\u0430\u0436\u0430\u0435\u0442 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 Wasm. 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