1 files changed, 51 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/es6/iterator-invalid-receiver-opt.js b/deps/v8/test/mjsunit/es6/iterator-invalid-receiver-opt.js
new file mode 100644
index 0000000000..fac416b5b5
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+++ b/deps/v8/test/mjsunit/es6/iterator-invalid-receiver-opt.js
@@ -0,0 +1,51 @@
+// Copyright 2019 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.
+
+// The GetIterator bytecode is used to implement a part of the iterator
+// protocol (https://tc39.es/ecma262/#sec-getiterator).
+// Here, call to the @@iterator property returns invalid JS receiver.
+// This test ensures that the optimized version of the GetIterator bytecode
+// incorporates exception handling mechanism without deoptimizing.
+
+// Flags: --allow-natives-syntax --opt
+
+var iteratorCount = 0;
+var exceptionCount = 0;
+
+function foo(obj) {
+    // The following for-of loop uses the iterator protocol to iterate
+    // over the 'obj'.
+    // The GetIterator bytecode invovlves 3 steps:
+    // 1. method = GetMethod(obj, @@iterator)
+    // 2. iterator = Call(method, obj)
+    // 3. if(!IsJSReceiver(iterator)) throw SymbolIteratorInvalid.
+     try{
+        for(let a of obj){
+            assertUnreachable();
+        }
+    } catch(e){
+        exceptionCount++;
+    }
+}
+
+// This iterator retuns '3' which is not a valid JSReceiver
+var iterator = function() {
+    iteratorCount++;
+    return 3;
+}
+
+let y = {
+    get [Symbol.iterator]() {
+       return iterator;
+    }
+};
+
+%PrepareFunctionForOptimization(foo);
+foo(y);
+foo(y);
+%OptimizeFunctionOnNextCall(foo);
+foo(y);
+assertOptimized(foo);
+assertEquals(iteratorCount, 3);
+assertEquals(exceptionCount, 3);