17a74ddd3d
PR-URL: https://github.com/nodejs/node/pull/49639 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
// Copyright 2021 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 --turbofan --no-concurrent-recompilation
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// Flags: --no-always-turbofan --no-assert-types
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// This weak ref is for checking whether the closure-allocated object o got
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// collected as it should.
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var weak;
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// Return a function which refers to a variable from its enclosing function.
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function makeFn() {
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var o = {};
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weak = new WeakRef(o);
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o.num = 0;
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return () => { return ++o.num; };
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}
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// Simple wrapper function which will cause inlining.
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function g(f) {
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f();
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}
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// Optimize g so that it inlines a specific function instance created by makeFn,
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// and then drop all user-visible references to that function instance.
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(function () {
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var fn = makeFn();
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%PrepareFunctionForOptimization(g);
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%PrepareFunctionForOptimization(fn);
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g(fn);
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%OptimizeFunctionOnNextCall(g);
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g(fn);
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})();
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// WeakRefs created during the current microtask are strong, so defer the rest.
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setTimeout(() => {
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// Since the function inlined by g no longer exists, it should deopt and
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// release the inner function.
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// We need to invoke GC asynchronously and wait for it to finish, so that
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// it doesn't need to scan the stack. Otherwise, the objects may not be
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// reclaimed because of conservative stack scanning and the test may not
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// work as intended.
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(async function () {
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await gc({ type: 'major', execution: 'async' });
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// Check that the memory leak described in v8:4578 no longer happens.
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assertEquals(undefined, weak.deref());
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})();
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}, 0);
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