Clone engine262 in /engine262

engine262/src/intrinsics/ArrayBuffer.mjs

@@ -0,0 +1,44 @@
+import { surroundingAgent } from '../engine.mjs';
+import { Type, Value, wellKnownSymbols } from '../value.mjs';
+import { Q } from '../completion.mjs';
+import { ToIndex, AllocateArrayBuffer } from '../abstract-ops/all.mjs';
+import { BootstrapConstructor } from './Bootstrap.mjs';
+
+// #sec-arraybuffer-length
+function ArrayBufferConstructor([length = Value.undefined], { NewTarget }) {
+  // 1. If NewTarget is undefined, throw a TypeError exception.
+  if (NewTarget === Value.undefined) {
+    return surroundingAgent.Throw('TypeError', 'ConstructorNonCallable', this);
+  }
+  // 2. Let byteLength be ? ToIndex(length).
+  const byteLength = Q(ToIndex(length));
+  // 3. Return ? AllocateArrayBuffer(NewTarget, byteLength).
+  return Q(AllocateArrayBuffer(NewTarget, byteLength));
+}
+
+// #sec-arraybuffer.isview
+function ArrayBuffer_isView([arg = Value.undefined]) {
+  // 1. If Type(arg) is not Object, return false.
+  if (Type(arg) !== 'Object') {
+    return Value.false;
+  }
+  // 2. If arg has a [[ViewedArrayBuffer]] internal slot, return true.
+  if ('ViewedArrayBuffer' in arg) {
+    return Value.true;
+  }
+  // 3. Return false.
+  return Value.false;
+}
+
+// #sec-get-arraybuffer-@@species
+function ArrayBuffer_species(a, { thisValue }) {
+  return thisValue;
+}
+
+export function BootstrapArrayBuffer(realmRec) {
+  const c = BootstrapConstructor(realmRec, ArrayBufferConstructor, 'ArrayBuffer', 1, realmRec.Intrinsics['%ArrayBuffer.prototype%'], [
+    ['isView', ArrayBuffer_isView, 1],
+    [wellKnownSymbols.species, [ArrayBuffer_species]],
+  ]);
+  realmRec.Intrinsics['%ArrayBuffer%'] = c;
+}