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“WebAssembly (WASM) is a compact binary instruction format designed for near-native execution speed. Every valid .wasm file begins with a 4-byte magic preamble (\0asm) followed by a 4-byte version number (0x01), divided into sequential numbered sections (Type, Import, Function, Table, Memory, Export, Code).”
The structure of .wasm binary modules, magic preamble 0x00 0x61 0x73 0x6d, and section tables.
(module
;; Function Signature (Type Section)
(func $add (param $a i32) (param $b i32) (result i32)
local.get $a
local.get $b
i32.add)
;; Export to Host (Export Section)
(export "add" (func $add))
)// Streaming Compilation & Instantiation
const response = await fetch('/math.wasm');
const { instance } = await WebAssembly.instantiateStreaming(response);
const result = instance.exports.add(40, 2);
console.log('Wasm result:', result); // 42Engine reads 8-byte preamble: \0asm (0x00 0x61 0x73 0x6d) + version 1 (0x01 0x00 0x00 0x00)
Section 1 (Type Section): Decodes function parameter and return type signatures
Section 3 (Function Section): Maps function indices to declared type signatures
Section 7 (Export Section): Exposes named functions to the host environment (JavaScript)
Section 10 (Code Section): Contains raw bytecode bodies for each function
Wasm binary bytecode parses at single-pass linear time (~10-20x faster than JavaScript source text parsing), allowing immediate streaming compilation via WebAssembly.compileStreaming().