arraybuffer-transfer.js

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let exp = wasmEvalText(`(module

    (memory 1)

    (export "mem" (memory 0))

    (func $f (result i32) (i32.load (i32.const 0)))

    (export "zero" (func $f))

)`).exports;

const byteLength = 65536;

let buffer = exp.mem.buffer;

let i32 = new Int32Array(buffer);

let zero = exp.zero;

const magic = 0xbadf00d;

assertEq(zero(), 0);

assertEq(i32[0], 0);

i32[0] = magic;

assertEq(zero(), magic);

assertEq(i32[0], magic);

assertEq(buffer.detached, false);

assertEq(buffer.byteLength, byteLength);

// Can't transfer Wasm prepared array buffers.

assertThrowsInstanceOf(() => buffer.transfer(), TypeError);

// |buffer| is still attached.

assertEq(buffer.detached, false);

assertEq(buffer.byteLength, byteLength);

// Access still returns the original value.

assertEq(zero(), magic);

assertEq(i32[0], magic);