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// Copyright 2017 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 --no-always-opt --opt
// Check that we properly deoptimize TurboFan'ed code when we constant-fold
// elements from a COW array and we change the length of the array.
(function() {
const a = [1, 2, 3];
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a.length = 1;
assertEquals(1, foo());
assertUnoptimized(foo);
})();
// Check that we properly deoptimize TurboFan'ed code when we constant-fold
// elements from a COW array and we change the element of the array.
(function() {
const a = [1, 2, 3];
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(42, foo());
assertUnoptimized(foo);
})();
// Packed
// Non-extensible
(function() {
const a = Object.preventExtensions([1, 2, '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(42, foo());
})();
// Sealed
(function() {
const a = Object.seal([1, 2, '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(42, foo());
})();
// Frozen
(function() {
const a = Object.freeze([1, 2, '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(1, foo());
})();
// Holey
// Non-extensible
(function() {
const a = Object.preventExtensions([1, 2, , '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(42, foo());
})();
// Sealed
(function() {
const a = Object.seal([1, 2, , '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(42, foo());
})();
// Frozen
(function() {
const a = Object.freeze([1, 2, , '3']);
const foo = () => a[0];
%PrepareFunctionForOptimization(foo);
assertEquals(1, foo());
assertEquals(1, foo());
%OptimizeFunctionForTopTier(foo);
assertEquals(1, foo());
assertOptimized(foo);
a[0] = 42;
assertEquals(1, foo());
})();
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