bug1821582.js - mozsearch

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// Test that SharedArrayBuffer identity is preserved during WebAssembly.Memory cloning.

const options = {

  SharedArrayBuffer: "allow",

};

function testMemoryWithTypedArrays() {

  var memory = new WebAssembly.Memory({ initial: 1, maximum: 1, shared: true });

  var buffer = memory.buffer;

  var arr1 = new Int32Array(buffer, 0, 10);

  var arr2 = new Int32Array(buffer, 40, 10);

  arr1[0] = 42;

  arr2[0] = 100;

  // Test with memory first in the object

  var obj1 = { memory, arr1, arr2 };

  var clonebuf1 = serialize(obj1, undefined, {scope: "SameProcess", ...options});

  var result1 = deserialize(clonebuf1, {...options});

  assertEq(result1.memory instanceof WebAssembly.Memory, true);

  assertEq(result1.arr1.buffer === result1.memory.buffer, true);

  assertEq(result1.arr2.buffer === result1.memory.buffer, true);

  assertEq(result1.arr1.buffer === result1.arr2.buffer, true);

  assertEq(result1.arr1[0], 42);

  assertEq(result1.arr2[0], 100);

  // Test with typed arrays before memory

  var obj2 = { arr1, arr2, memory };

  var clonebuf2 = serialize(obj2, undefined, {scope: "SameProcess", ...options});

  var result2 = deserialize(clonebuf2, {...options});

  assertEq(result2.memory instanceof WebAssembly.Memory, true);

  assertEq(result2.arr1.buffer === result2.memory.buffer, true);

  assertEq(result2.arr2.buffer === result2.memory.buffer, true);

  assertEq(result2.arr1.buffer === result2.arr2.buffer, true);

  assertEq(result2.arr1[0], 42);

  assertEq(result2.arr2[0], 100);

testMemoryWithTypedArrays();