{"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\/de\/blog\/novosti-interneta\/razrabotchiki-v8-predstavili-dekompilyator-dlya-webassembly","title":{"rendered":"Die Entwickler von V8 haben einen Decompiler f\u00fcr WebAssembly vorgestellt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Die Entwickler der JavaScript-Engine V8 haben vorgestellt<\/a><\/noindex> ein Tool wasm-decompile<\/a><\/noindex>, das die Dekompilierung der Zwischenbinarrepr\u00e4sentation WebAssembly<\/a><\/noindex> in eine lesbare Pseudocode-Sprache, die an JavaScript und C erinnert. Diese vorgeschlagene Pseudocode-Sprache ist deutlich einfacher zu verstehen und besser f\u00fcr die manuelle Analyse geeignet als die textuelle Darstellung von WebAssembly im Format «.wat»<\/span>, die n\u00e4her am Assembler als an Hochsprachen ist. Dabei spiegelt die Dekompilierung nach M\u00f6glichkeit die Wasm-Darstellung vollst\u00e4ndig wider.<\/p>\n

Der Decompiler ist Teil des Tools<\/a><\/noindex> WABT , das die \u00dcbersetzung zwischen bin\u00e4ren und textuellen Repr\u00e4sentationen von WebAssembly sowie das Parsen, Verarbeiten, Modifizieren und \u00dcberpr\u00fcfen von wasm-Dateien erm\u00f6glicht. Im Rahmen von WABT wird auch das Tool<\/a><\/noindex>wasm2c , das es erm\u00f6glicht, wasm-Dateien in \u00e4quivalenten C-Code zu dekompilieren, der mit einem C-Compiler kompiliert werden kann, jedoch in Bezug auf die Lesbarkeit nur wenig von der Textdarstellung \u201ewat\u201c unterscheidet, weiterentwickelt.<\/a><\/noindex>, die es erm\u00f6glicht, wasm-Dateien in \u00e4quivalenten C-Code zu dekompilieren, der mit einem C-Compiler kompiliert werden kann, jedoch im Hinblick auf die Lesbarkeit wenig von der textuellen Darstellung «wat»<\/span> abweicht.<\/p>\n

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

float dot(const vec3 *a, const vec3 *b) {<\/p>\n

return a->x * b->x +
\n return a->x * b->x +
\n a->y * b->y +
\n a->z * b->z;
\n }<\/p>\n

wird von der wasm-decompile Utility in eine pseudocode Sprache dekodiert<\/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

w\u00e4hrend die Umwandlung in das Textformat «.wat»<\/span> wie folgt aussehen w\u00fcrde<\/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

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

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