grow-memory-resizable-buffer.js

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// Ensure ArrayBuffer views are updated after resize/grow.

function testResize() {

  let memory = new WebAssembly.Memory({initial: 1, maximum: 3});

  let buffer = memory.toResizableBuffer();

  let view1 = new Uint8Array(buffer);

  let view2 = new Int32Array(buffer);

  assertEq(view1.length, PageSizeInBytes);

  assertEq(view2.byteLength, PageSizeInBytes);

  // Test ArrayBuffer.prototype.resize.

  buffer.resize(2 * PageSizeInBytes);

  assertEq(buffer.byteLength, 2 * PageSizeInBytes);

  assertEq(view1.length, 2 * PageSizeInBytes);

  assertEq(view2.byteLength, 2 * PageSizeInBytes);

  // Test WebAssembly.Memory.prototype.grow.

  memory.grow(1);

  assertEq(buffer.byteLength, 3 * PageSizeInBytes);

  assertEq(view1.length, 3 * PageSizeInBytes);

  assertEq(view2.byteLength, 3 * PageSizeInBytes);

testResize();

function testGrow() {

  let memory = new WebAssembly.Memory({initial: 1, maximum: 3, shared: true});

  let buffer = memory.toResizableBuffer();

  let view1 = new Uint8Array(buffer);

  let view2 = new Int32Array(buffer);

  assertEq(view1.length, PageSizeInBytes);

  assertEq(view2.byteLength, PageSizeInBytes);

  // Test SharedArrayBuffer.prototype.grow.

  buffer.grow(2 * PageSizeInBytes);

  assertEq(buffer.byteLength, 2 * PageSizeInBytes);

  assertEq(view1.length, 2 * PageSizeInBytes);

  assertEq(view2.byteLength, 2 * PageSizeInBytes);

  // Test WebAssembly.Memory.prototype.grow.

  memory.grow(1);

  assertEq(buffer.byteLength, 3 * PageSizeInBytes);

  assertEq(view1.length, 3 * PageSizeInBytes);

  assertEq(view2.byteLength, 3 * PageSizeInBytes);

testGrow();