fd4f80ce54
PR-URL: https://github.com/nodejs/node/pull/42657 Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Michael Dawson <midawson@redhat.com>
40 lines
917 B
JavaScript
40 lines
917 B
JavaScript
// Copyright 2022 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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function f(x) {
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return x.a
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}
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function Foo(a) {
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this.a = a
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}
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%PrepareFunctionForOptimization(f);
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// Smi
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var o1_1 = new Foo(1);
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var o1_2 = new Foo(1);
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// Transition map to double, o1 is deprecated, o1's map is a deprecation target.
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var o2 = new Foo(1.2);
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// Transition map to tagged, o1 is still deprecated.
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var an_object = {};
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var o3 = new Foo(an_object);
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assertEquals(1, f(o1_1));
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assertEquals(1.2, f(o2));
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assertEquals(an_object, f(o3));
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// o1_1 got migrated, but o1_2 hasn't yet.
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assertTrue(%HaveSameMap(o1_1,o3));
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assertFalse(%HaveSameMap(o1_2,o3));
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%OptimizeMaglevOnNextCall(f);
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// Deprecated map works
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assertEquals(1, f(o1_2));
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// Non-deprecated map works
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assertEquals(an_object, f(o3));
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