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9d7cd9b864
PR-URL: https://github.com/nodejs/node/pull/54077 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
33 lines
949 B
JavaScript
33 lines
949 B
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 --expose-gc
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function add(s1, s2) { return s1 + s2; }
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function f(x) {
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let str = add("abcabcabcabcabc", "defdefdefdefdefdef");
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// After inlining of {add}, {str} will be constant-folded.
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let o = [ str, x ];
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// {o} will be escape-analyzed away, and {str} will flow into a FrameState and
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// thus be recorded in the DeoptimizationLiteralArray of the function. This
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// will be the only pointer to {str}, and should thus not be weak so
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// that {str} isn't freed on GC.
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return o[1] + str.length;
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}
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%PrepareFunctionForOptimization(add);
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%PrepareFunctionForOptimization(f);
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assertEquals(75, f(42));
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%OptimizeFunctionOnNextCall(f);
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assertEquals(75, f(42));
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gc();
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gc();
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// And now trigger the deopt.
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assertEquals("abc33", f("abc", true));
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