918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
// Copyright 2024 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 --turbolev --turbofan
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// Flags: --no-always-turbofan
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function alloc_array(n) {
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let a = new Array(n);
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a[0] = 42;
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// not changing a[1]
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a[2] = 17;
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return a;
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}
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%PrepareFunctionForOptimization(alloc_array);
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assertEquals([42, /*hole*/, 17, /*hole*/], alloc_array(3));
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%OptimizeFunctionOnNextCall(alloc_array);
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assertEquals([42, /*hole*/, 17, /*hole*/], alloc_array(3));
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assertOptimized(alloc_array);
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// Testing negative length.
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assertThrows(() => alloc_array(-2), RangeError);
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// Note that this shouldn't deopt the function.
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assertOptimized(alloc_array);
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// Trying to allocated more than JSArray::kInitialMaxFastElementArray will
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// trigger a deopt.
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let len_for_deopt = 0x3ffc;
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let expected = new Array(len_for_deopt);
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expected[0] = 42;
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expected[2] = 17;
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assertEquals(expected, alloc_array(len_for_deopt));
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assertUnoptimized(alloc_array);
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%OptimizeFunctionOnNextCall(alloc_array);
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assertEquals([42, /*hole*/, 17, /*hole*/], alloc_array(3));
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assertOptimized(alloc_array);
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// Making sure that we don't deopt anymore when allocating an array of size
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// JSArray::kInitialMaxFastElementArray (otherwise, there is a deopt loop).
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assertEquals(expected, alloc_array(len_for_deopt));
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assertOptimized(alloc_array);
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