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Unified Diff: test/mjsunit/harmony/array-concat-object-proto.js

Issue 1409123003: [runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: merging with master Created 4 years, 7 months ago
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Index: test/mjsunit/harmony/array-concat-object-proto.js
diff --git a/test/mjsunit/harmony/array-concat-object-proto.js b/test/mjsunit/harmony/array-concat-object-proto.js
new file mode 100644
index 0000000000000000000000000000000000000000..307326cbcd2c76374e70879c2d697d4cea714f05
--- /dev/null
+++ b/test/mjsunit/harmony/array-concat-object-proto.js
@@ -0,0 +1,48 @@
+// Copyright 2016 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.
+
+// Check that @@isConcatSpreadable is checked when set on Object.prototype
+
+"use strict"
+
+var array = [1, 2, 3];
+var object = {length: 1, '0': 'a'};
+
+function testConcatDefaults() {
+ assertEquals(array, [].concat(array));
+ assertEquals(array, array.concat([]));
+ assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
+ assertEquals([object], [].concat(object));
+ assertEquals([1, 2, 3, object], array.concat(object));
+ assertEquals([object], Array.prototype.concat.call(object,[]));
+ assertEquals([object, 1, 2, 3], Array.prototype.concat.call(object, array));
+ assertEquals([object, object], Array.prototype.concat.call(object, object));
+}
+
+testConcatDefaults();
+
+Object.prototype[Symbol.isConcatSpreadable] = false;
+
+assertEquals([[], array], [].concat(array));
+assertEquals([array, []], array.concat([]));
+assertEquals([array, array], array.concat(array));
+assertEquals([[], object], [].concat(object));
+assertEquals([array, object], array.concat(object));
+assertEquals([object, []], Array.prototype.concat.call(object,[]));
+assertEquals([object, array], Array.prototype.concat.call(object, array));
+assertEquals([object, object], Array.prototype.concat.call(object, object));
+
+Object.prototype[Symbol.isConcatSpreadable] = true;
+
+assertEquals(array, [].concat(array));
+assertEquals(array, array.concat([]));
+assertEquals([1, 2, 3, 1, 2, 3], array.concat(array));
+assertEquals(['a'], [].concat(object));
+assertEquals([1, 2, 3, 'a'], array.concat(object));
+assertEquals(['a'], Array.prototype.concat.call(object,[]));
+assertEquals(['a', 1, 2, 3], Array.prototype.concat.call(object, array));
+assertEquals(['a', 'a'], Array.prototype.concat.call(object, object));
+
+delete Object.prototype[Symbol.isConcatSpreadable];
+testConcatDefaults();
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