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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>
42 lines
1.2 KiB
JavaScript
42 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 --expose-gc
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function g(b) {
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if (b) {
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// We now remove the only strong pointer to `global_object.y` that we had
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// and trigger a GC. This should still not free `global_object.y`, since the
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// DeoptimizationLiteralArray for `f` holds a weak pointer to it, but the GC
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// will treat it as a strong pointer because `f` is on the stack.
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global_object = undefined;
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gc();
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}
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}
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%NeverOptimizeFunction(g);
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global_object = { y : { this_is_the_name : 155 } };
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function f(x, b) {
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// {global_object} is constant, which means that {global_object.y} will be
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// constant-folded.
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let o = [ global_object.y, 42 ];
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// {o} will be escape-analyzed away, and {global_object.y} (a JSReceiver) will
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// flow into a FrameState, which will lead the code object holding a weak
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// pointer to it in its DeoptimizationLiteralArray.
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g(b);
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return o[1] + x;
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}
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%PrepareFunctionForOptimization(f);
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assertEquals(84, f(42, false));
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%OptimizeFunctionOnNextCall(f);
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assertEquals(84, f(42, false));
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// And now trigger the deopt.
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assertEquals(84, f(42, true));
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