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deps/v8/test/mjsunit/maglev/extend-properties-backing-store-2.js

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+// Copyright 2024 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --allow-natives-syntax --maglev
+
+function addProperties(o) {
+  // Add enough properties to exhaust the slack, so that adding the property
+  // in `foo` will need to grow the property backing store.
+  o.a1 = 1;
+  o.a2 = 2;
+  o.a3 = 3;
+  o.a4 = 4;
+  o.a5 = 5;
+  o.a6 = 6;
+  o.a7 = 7;
+}
+
+const s = new Set();
+
+function foo(o) {
+  o.b = 2;
+}
+%PrepareFunctionForOptimization(foo);
+
+let o1 = {};
+addProperties(o1);
+
+// Make the StoreIC in `foo` polymorphic.
+foo(o1);
+foo({a: 0, b: 2});
+
+%OptimizeMaglevOnNextCall(foo);
+foo({a: 1, b: 3});
+
+let o2 = {};
+addProperties(o2);
+s.add(o2);  // Force creating the hash.
+
+foo(o2);
+// Assert that the hash value was preseved when extending the properties
+// backing store.
+assertTrue(s.has(o2));