Function validateAllowGrowableSharedArrayBuffer

lib/internal/webidl.js:899–912

* Validates the [AllowResizable] constraint for growable SharedArrayBuffer. * @param {SharedArrayBuffer} buffer SharedArrayBuffer backing buffer. * @param {ConversionOptions} options Conversion options. * @returns {void}

(buffer, options)

 * @returns {void}
 */
function validateAllowGrowableSharedArrayBuffer(buffer, options) {
  // SharedArrayBuffer and ArrayBufferView conversion step 3:
  // IsFixedLengthArrayBuffer(buffer) must be true without [AllowResizable].
  // Do not use a primordial getter here. When this module is included in the
  // startup snapshot, an early-captured SharedArrayBuffer.prototype.growable
  // getter does not detect growable buffers created after deserialization.
  // Lazily capturing the getter would work, but it would observe the runtime
  // prototype at first comparison, so it would not be an actual primordial.
  if (!options.allowResizable && buffer.growable) {
    throw makeException(
      'is backed by a growable SharedArrayBuffer, which is not allowed.',
      options);
  }
}

/**
 * Validates the [AllowResizable] constraint for resizable ArrayBuffer.