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deps/v8/test/mjsunit/compiler/globals-freeze-constant.js

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+// Copyright 2020 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 --turbofan --no-always-turbofan
+
+
+glo = 0;
+
+function write_glo(x) { glo = x }
+
+%PrepareFunctionForOptimization(write_glo);
+write_glo(0);
+assertEquals(0, glo);
+
+// At this point, glo has cell type Constant.
+
+%OptimizeFunctionOnNextCall(write_glo);
+write_glo(0);
+assertEquals(0, glo);
+assertOptimized(write_glo);
+
+Object.freeze(this);
+assertUnoptimized(write_glo);
+write_glo(1);
+assertEquals(0, glo);