1 files changed, 80 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/es6/collections-constructor-iterator-side-effect.js b/deps/v8/test/mjsunit/es6/collections-constructor-iterator-side-effect.js
new file mode 100644
index 0000000000..50308fdde3
--- /dev/null
+++ b/deps/v8/test/mjsunit/es6/collections-constructor-iterator-side-effect.js
@@ -0,0 +1,80 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --opt
+
+function TestSetWithModifiedIterator(ctor) {
+  const k1 = {};
+  const k2 = {};
+  const entries = [k1, k2];
+  const arrayIteratorProto = Object.getPrototypeOf(entries[Symbol.iterator]());
+  const originalNext = arrayIteratorProto.next;
+  let callCount = 0;
+  arrayIteratorProto.next = function() {
+    callCount++;
+    return originalNext.call(this);
+  };
+
+  const set = new ctor(entries);
+  assertEquals(3, callCount); // +1 for iterator done
+
+  if('size' in set) assertEquals(2, set.size);
+  assertTrue(set.has(k1));
+  assertTrue(set.has(k2));
+
+  arrayIteratorProto.next = originalNext;
+}
+TestSetWithModifiedIterator(Set);
+TestSetWithModifiedIterator(Set);
+TestSetWithModifiedIterator(Set);
+%OptimizeFunctionOnNextCall(TestSetWithModifiedIterator);
+TestSetWithModifiedIterator(Set);
+assertOptimized(TestSetWithModifiedIterator);
+%DeoptimizeFunction(TestSetWithModifiedIterator);
+
+TestSetWithModifiedIterator(WeakSet);
+TestSetWithModifiedIterator(WeakSet);
+TestSetWithModifiedIterator(WeakSet);
+%OptimizeFunctionOnNextCall(TestSetWithModifiedIterator);
+TestSetWithModifiedIterator(WeakSet);
+assertOptimized(TestSetWithModifiedIterator);
+%DeoptimizeFunction(TestSetWithModifiedIterator);
+
+
+function TestMapWithModifiedIterator(ctor) {
+  const k1 = {};
+  const k2 = {};
+  const entries = [[k1, 1], [k2, 2]];
+  const arrayIteratorProto = Object.getPrototypeOf(entries[Symbol.iterator]());
+  const originalNext = arrayIteratorProto.next;
+  let callCount = 0;
+  arrayIteratorProto.next = function() {
+    callCount++;
+    return originalNext.call(this);
+  };
+
+  const set = new ctor(entries);
+  assertEquals(3, callCount); // +1 for iterator done
+
+  if('size' in set) assertEquals(2, set.size);
+  assertEquals(1, set.get(k1));
+  assertEquals(2, set.get(k2));
+
+  arrayIteratorProto.next = originalNext;
+}
+TestMapWithModifiedIterator(Map);
+TestMapWithModifiedIterator(Map);
+TestMapWithModifiedIterator(Map);
+%OptimizeFunctionOnNextCall(TestMapWithModifiedIterator);
+TestMapWithModifiedIterator(Map);
+assertOptimized(TestMapWithModifiedIterator);
+%DeoptimizeFunction(TestMapWithModifiedIterator);
+
+TestMapWithModifiedIterator(WeakMap);
+TestMapWithModifiedIterator(WeakMap);
+TestMapWithModifiedIterator(WeakMap);
+%OptimizeFunctionOnNextCall(TestMapWithModifiedIterator);
+TestMapWithModifiedIterator(WeakMap);
+assertOptimized(TestMapWithModifiedIterator);
+%DeoptimizeFunction(TestMapWithModifiedIterator);