v8: serialize BigInt64Array and BigUint64Array

Teach the serializer about BigInt64Array and BigUint64Array.

I open-coded the type-to-index mapper to stay compatible with the
current wire format without undue code gymnastics.

Author: bnoordhuis

lib/v8.js

@@ -19,6 +19,8 @@ const {
   ArrayBuffer,
   ArrayPrototypeForEach,
   ArrayPrototypePush,
+  BigInt64Array,
+  BigUint64Array,
   DataView,
   Error,
   Float32Array,
@@ -27,7 +29,6 @@ const {
   Int32Array,
   Int8Array,
   ObjectPrototypeToString,
-  SafeMap,
   Uint16Array,
   Uint32Array,
   Uint8Array,
@@ -247,29 +248,40 @@ Deserializer.prototype.readRawBytes = function readRawBytes(length) {
                         length);
 };
 
-/* Keep track of how to handle different ArrayBufferViews.
- * The default Serializer for Node does not use the V8 methods for serializing
- * those objects because Node's `Buffer` objects use pooled allocation in many
- * cases, and their underlying `ArrayBuffer`s would show up in the
- * serialization. Because a) those may contain sensitive data and the user
- * may not be aware of that and b) they are often much larger than the `Buffer`
- * itself, custom serialization is applied. */
-const arrayBufferViewTypes = [Int8Array, Uint8Array, Uint8ClampedArray,
-                              Int16Array, Uint16Array, Int32Array, Uint32Array,
-                              Float32Array, Float64Array, DataView];
-
-const arrayBufferViewTypeToIndex = new SafeMap();
-
-{
-  const dummy = new ArrayBuffer();
-  ArrayPrototypeForEach(arrayBufferViewTypes, (ctor, i) => {
-    const tag = ObjectPrototypeToString(new ctor(dummy));
-    arrayBufferViewTypeToIndex.set(tag, i);
-  });
+function arrayBufferViewTypeToIndex(abView) {
+  const type = ObjectPrototypeToString(abView);
+  if (type === '[object Int8Array]') return 0;
+  if (type === '[object Uint8Array]') return 1;
+  if (type === '[object Uint8ClampedArray]') return 2;
+  if (type === '[object Int16Array]') return 3;
+  if (type === '[object Uint16Array]') return 4;
+  if (type === '[object Int32Array]') return 5;
+  if (type === '[object Uint32Array]') return 6;
+  if (type === '[object Float32Array]') return 7;
+  if (type === '[object Float64Array]') return 8;
+  if (type === '[object DataView]') return 9;
+  // Index 10 is FastBuffer.
+  if (type === '[object BigInt64Array]') return 11;
+  if (type === '[object BigUint64Array]') return 12;
+  return -1;
 }
 
-const bufferConstructorIndex =
-  ArrayPrototypePush(arrayBufferViewTypes, FastBuffer) - 1;
+function arrayBufferViewIndexToType(index) {
+  if (index === 0) return Int8Array;
+  if (index === 1) return Uint8Array;
+  if (index === 2) return Uint8ClampedArray;
+  if (index === 3) return Int16Array;
+  if (index === 4) return Uint16Array;
+  if (index === 5) return Int32Array;
+  if (index === 6) return Uint32Array;
+  if (index === 7) return Float32Array;
+  if (index === 8) return Float64Array;
+  if (index === 9) return DataView;
+  if (index === 10) return FastBuffer;
+  if (index === 11) return BigInt64Array;
+  if (index === 12) return BigUint64Array;
+  return undefined;
+}
 
 class DefaultSerializer extends Serializer {
   constructor() {
@@ -285,14 +297,17 @@ class DefaultSerializer extends Serializer {
    * @returns {void}
    */
   _writeHostObject(abView) {
-    let i = 0;
-    if (abView.constructor === Buffer) {
-      i = bufferConstructorIndex;
-    } else {
-      const tag = ObjectPrototypeToString(abView);
-      i = arrayBufferViewTypeToIndex.get(tag);
-
-      if (i === undefined) {
+    // Keep track of how to handle different ArrayBufferViews. The default
+    // Serializer for Node does not use the V8 methods for serializing those
+    // objects because Node's `Buffer` objects use pooled allocation in many
+    // cases, and their underlying `ArrayBuffer`s would show up in the
+    // serialization. Because a) those may contain sensitive data and the user
+    // may not be aware of that and b) they are often much larger than the
+    // `Buffer` itself, custom serialization is applied.
+    let i = 10;  // FastBuffer
+    if (abView.constructor !== Buffer) {
+      i = arrayBufferViewTypeToIndex(abView);
+      if (i === -1) {
         throw new this._getDataCloneError(
           `Unserializable host object: ${inspect(abView)}`);
       }
@@ -313,7 +328,7 @@ class DefaultDeserializer extends Deserializer {
    */
   _readHostObject() {
     const typeIndex = this.readUint32();
-    const ctor = arrayBufferViewTypes[typeIndex];
+    const ctor = arrayBufferViewIndexToType(typeIndex);
     const byteLength = this.readUint32();
     const byteOffset = this._readRawBytes(byteLength);
     const BYTES_PER_ELEMENT = ctor.BYTES_PER_ELEMENT || 1;

test/parallel/test-v8-serdes.js

@@ -14,10 +14,18 @@ circular.circular = circular;
 const objects = [
   { foo: 'bar' },
   { bar: 'baz' },
+  new Int8Array([1, 2, 3, 4]),
   new Uint8Array([1, 2, 3, 4]),
+  new Int16Array([1, 2, 3, 4]),
+  new Uint16Array([1, 2, 3, 4]),
+  new Int32Array([1, 2, 3, 4]),
   new Uint32Array([1, 2, 3, 4]),
+  new Float32Array([1, 2, 3, 4]),
+  new Float64Array([1, 2, 3, 4]),
   new DataView(new ArrayBuffer(42)),
   Buffer.from([1, 2, 3, 4]),
+  new BigInt64Array([42n]),
+  new BigUint64Array([42n]),
   undefined,
   null,
   42,