LayoutTests/js/pic/cached-named-property-getter.html

<p>
This page tests cached access to getters and setters. If the test passes,
you'll see a series of PASS messages below.
</p>

<pre id="console"></pre>

<script>
(function() {
    if (window.testRunner)
        testRunner.dumpAsText();

    function log(s)
    {
        if (this.document)
            document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
        else
            print(s + "\n");
    }
    
    function shouldBe(a, aDescription, b)
    {
        if (a === b) {
            log("PASS: " + aDescription + " should be " + b + " and is.");
        } else {
            log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
        }
    }
    
    function testGetter(o) {
        var result;
        for (var i = 0; i < 10; i++)
            result = o.length;
        return result;
    }
    function testProtoGetter(o) {
        var result;
        for (var i = 0; i < 10; i++)
            result = o.length;
        return result;
    }
    function testProtoChainGetter(o) {
        var result;
        for (var i = 0; i < 10; i++)
            result = o.length;
        return result;
    }
    function getterTest(str, expected) {
        shouldBe(eval(str), str, expected);
    }
    var testFunction3 = function(a,b,c){}
    var testFunction5 = function(a,b,c,d,e){}
    getterTest("testGetter({__proto__: {count: 'FAIL'}, get length(){ return this.count; }, count: 7})", 7);
    getterTest("testGetter(testFunction3)", 3);
    getterTest("testGetter(testFunction5)", 5);
    
    getterTest("testProtoGetter({__proto__: {count: 'FAIL', get length(){ return this.count; }}, count: 7})", 7);
    getterTest("testProtoGetter({__proto__: testFunction3, count: 'FAIL'})", 3);
    getterTest("testProtoGetter({__proto__: testFunction5, count: 'FAIL'})", 5);

    getterTest("testProtoChainGetter({__proto__: {__proto__: {count: 'FAIL', get length(){ return this.count; }}}, count: 7})", 7);
    getterTest("testProtoChainGetter({__proto__: {__proto__: testFunction3}, count: 'FAIL'})", 3);
    getterTest("testProtoChainGetter({__proto__: {__proto__: testFunction5}, count: 'FAIL'})", 5);
    
    function testCustomGetter(o) {
        for (var i = 0; i < 10; i++)
            o.source;
    }
    var r=/a/;
    testCustomGetter(r);
    var r2=/b/;
    r2.__proto__ = r;
    testCustomGetter(r2);
    var r3=/c/;
    r3.__proto__ = r2;
    testCustomGetter(r3);

    function shouldThrow(func, errorMessage) {
        var errorThrown = false;
        var error = null;
        try {
            func();
        } catch (e) {
            errorThrown = true;
            error = e;
        }
        if (!errorThrown)
            throw new Error('not thrown');
        if (String(error) !== errorMessage)
            throw new Error(`bad error: ${String(error)}`);
    }

    shouldThrow(function () {
        testCustomGetter({__proto__: r});
    }, "TypeError: The RegExp.prototype.source getter can only be called on a RegExp object");
    shouldThrow(function () {
        testCustomGetter({__proto__: {__proto__: r}});
    }, "TypeError: The RegExp.prototype.source getter can only be called on a RegExp object");
})();
</script>