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4f72291521
PR-URL: https://github.com/nodejs/node/pull/39945 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Michael Dawson <midawson@redhat.com>
56 lines
1.7 KiB
JavaScript
56 lines
1.7 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 --turbo-optimize-apply --opt
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// These tests do not work well if this script is run more than once (e.g.
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// --stress-opt); after a few runs the whole function is immediately compiled
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// and assertions would fail. We prevent re-runs.
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// Flags: --nostress-opt --no-always-opt
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// Some of the tests rely on optimizing/deoptimizing at predictable moments, so
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// this is not suitable for deoptimization fuzzing.
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// Flags: --deopt-every-n-times=0
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// Test for optimization of CallWithSpread when the array iterator is replaced
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// with a generator function and the array in empty.
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//
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// Note: this test must be in a separate file because the test invalidates a
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// protector, which then remains invalidated.
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(function () {
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"use strict";
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// This invalidates the DependOnArrayIteratorProtector.
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Object.defineProperty(Array.prototype, Symbol.iterator, {
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value: function* () {
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yield 42;
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},
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});
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var log_got_interpreted = true;
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function log(a) {
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assertEquals(1, arguments.length);
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log_got_interpreted = %IsBeingInterpreted();
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return a;
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}
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function foo() {
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return log(...[]);
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}
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%PrepareFunctionForOptimization(log);
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%PrepareFunctionForOptimization(foo);
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assertEquals(42, foo());
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assertTrue(log_got_interpreted);
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// Compile foo.
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%OptimizeFunctionForTopTier(log);
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%OptimizeFunctionForTopTier(foo);
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assertEquals(42, foo());
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// The call with spread should not have been inlined, because of the
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// generator/iterator.
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assertFalse(log_got_interpreted);
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assertOptimized(foo);
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})();
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