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>
34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
// Copyright 2023 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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//
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// Flags: --allow-natives-syntax --maglev
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var o = { "foo": 42, "bar": 32 };
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function foo(o, k, do_lookup) {
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if (do_lookup)
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return o[k];
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}
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%PrepareFunctionForOptimization(foo);
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// Warm up the keyed load feedback in foo as always loading the name "foo".
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assertEquals(42, foo(o, "foo", true));
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assertEquals(42, foo(o, "foo", true));
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function bar(o, do_lookup) {
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// Bar does a lookup with "bar" on the object, using foo.
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return foo(o, "bar", do_lookup);
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}
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%PrepareFunctionForOptimization(bar);
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// Warm up bar as never having done the lookup, so that the named feedback in
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// foo stays "foo".
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assertEquals(undefined, bar(o, false));
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assertEquals(undefined, bar(o, false));
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// This optimization should not be confused by the potential mismatch between
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// the "foo" named feedback in foo, and the "bar" constant string in bar.
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%OptimizeMaglevOnNextCall(bar);
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assertEquals(undefined, bar(o, false));
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assertEquals(32, bar(o, true));
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