31a3cfbc10
BUG=v8:8801 Change-Id: I9d9d9824c6c9ad0176bbfd3723da1b578b17c256 Reviewed-on: https://chromium-review.googlesource.com/c/1495555 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Mythri Alle <mythria@chromium.org> Cr-Commit-Position: refs/heads/master@{#60001}
38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --no-always-opt --opt
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// Check that we properly deoptimize TurboFan'ed code when we constant-fold
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// elements from a COW array and we change the length of the array.
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(function() {
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const a = [1, 2, 3];
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const foo = () => a[0];
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%PrepareFunctionForOptimization(foo);
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assertEquals(1, foo());
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assertEquals(1, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(1, foo());
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assertOptimized(foo);
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a.length = 1;
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assertEquals(1, foo());
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assertUnoptimized(foo);
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})();
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// Check that we properly deoptimize TurboFan'ed code when we constant-fold
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// elements from a COW array and we change the element of the array.
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(function() {
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const a = [1, 2, 3];
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const foo = () => a[0];
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%PrepareFunctionForOptimization(foo);
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assertEquals(1, foo());
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assertEquals(1, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(1, foo());
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assertOptimized(foo);
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a[0] = 42;
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assertEquals(42, foo());
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assertUnoptimized(foo);
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})();
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