jdk8-mips64-public/nashorn: test/script/basic/JDK-8136544.js@1df40fe54cd6

     1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

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     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

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    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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    24 /**

    25  * JDK-8136544: Call site switching to megamorphic causes incorrect property read

    26  *

    27  * @test

    28  * @fork

    29  * @option -Dnashorn.unstable.relink.threshold=8

    30  * @run

    31  */

    33 var ScriptContext = Java.type("javax.script.ScriptContext");

    34 var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");

    35 var m = new ScriptEngineManager();

    36 var e = m.getEngineByName("nashorn");

    38 var scope = e.getBindings(ScriptContext.ENGINE_SCOPE);

    39 var MYVAR = "myvar";

    41 function loopupVar() {

    42     try {

    43         e.eval(MYVAR);

    44         return true;

    45     } catch (e) {

    46         return false;

    47     }

    48 }

    50 // make sure we exercise callsite beyond megamorphic threshold we set

    51 // in this test via nashorn.unstable.relink.threshold property

    52 // In each iteration, callsite is exercised twice (two evals)

    53 // So, LIMIT should be more than 4 to exercise megamorphic callsites.

    55 var LIMIT = 5; // This LIMIT should be more than 4

    57 for (var i = 0; i < LIMIT; i++) {

    58     // remove the variable and lookup

    59     delete scope[MYVAR];

    60     Assert.assertFalse(loopupVar(), "Expected true in iteration " + i);

    62     // set that variable and check again

    63     scope[MYVAR] = "foo";

    64     Assert.assertTrue(loopupVar(), "Expected false in iteration " + i);

    65 }

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