48db20f6f5
PR-URL: https://github.com/nodejs/node/pull/35700 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com>
72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
// Copyright 2020 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
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(function() {
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// Only run this test if doubles are transitioned in-place to tagged.
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let x = {};
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x.a = 0.1;
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let y = {};
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y.a = {};
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if (!%HaveSameMap(x, y)) return;
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// m1: {}
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let m1 = {};
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// m2: {a:d}
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let m2 = {};
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assertTrue(%HaveSameMap(m2, m1));
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m2.a = 13.37;
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// m3: {a:d, b:s}
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let m3 = {};
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m3.a = 13.37;
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assertTrue(%HaveSameMap(m3, m2));
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m3.b = 1;
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// m4: {a:d, b:s, c:h}
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let m4 = {};
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m4.a = 13.37;
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m4.b = 1;
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assertTrue(%HaveSameMap(m4, m3));
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m4.c = {};
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// m4_2 == m4
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let m4_2 = {};
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m4_2.a = 13.37;
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m4_2.b = 1;
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m4_2.c = {};
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assertTrue(%HaveSameMap(m4_2, m4));
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// m5: {a:d, b:d}
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let m5 = {};
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m5.a = 13.37;
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assertTrue(%HaveSameMap(m5, m2));
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m5.b = 13.37;
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assertFalse(%HaveSameMap(m5, m3));
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// At this point, Map3 and Map4 are both deprecated. Map2 transitions to
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// Map5. Map5 is the migration target for Map3.
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assertFalse(%HaveSameMap(m5, m3));
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// m6: {a:d, b:d, c:d}
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let m6 = {};
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m6.a = 13.37;
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assertTrue(%HaveSameMap(m6, m2));
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m6.b = 13.37;
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assertTrue(%HaveSameMap(m6, m5));
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m6.c = 13.37
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// Make m7: {a:d, b:d, c:t}
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let m7 = m4_2;
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assertTrue(%HaveSameMap(m7, m4));
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// Map4 is deprecated, so this property access triggers a Map migration.
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// With in-place map updates and no double unboxing, this should end up
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// migrating to Map6, and updating it in-place.
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m7.c;
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assertFalse(%HaveSameMap(m7, m4));
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assertTrue(%HaveSameMap(m6, m7));
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})();
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