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>
52 lines
1.2 KiB
JavaScript
52 lines
1.2 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 --turboshaft-string-concat-escape-analysis
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// Flags: --turbofan --no-always-turbofan
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function foo(str, c) {
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// Without de-duplication of the string concatenations in the FrameState, the
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// size of the FrameState will grow exponentially.
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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str += str;
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if (c) {
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// We're not collecting feedback for this, which means that it will be an
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// unconditional Deopt with `str` as input in the FrameState.
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return str + str;
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}
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}
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%PrepareFunctionForOptimization(foo);
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foo("a", false);
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foo("a", false);
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%OptimizeFunctionOnNextCall(foo);
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foo("a", false);
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assertOptimized(foo);
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// We pass `true` to the function, which triggers a deopt and causes it to
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// return the string.
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assertEquals("a".repeat(2 ** 21), foo("a", true));
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assertUnoptimized(foo);
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