53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
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// Copyright 2015 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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// Flags: --harmony-proxies --allow-natives-syntax
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// Test instanceof with proxies.
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function TestInstanceOfWithProxies() {
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function foo(x) {
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return x instanceof Array;
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}
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assertTrue(foo([]));
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assertFalse(foo({}));
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%OptimizeFunctionOnNextCall(foo);
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assertTrue(foo([]));
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assertFalse(foo({}));
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var handler = {
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getPrototypeOf: function(target) { return Array.prototype; }
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};
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var p = new Proxy({}, handler);
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assertTrue(foo(p));
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var o = {};
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o.__proto__ = p;
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assertTrue(foo(o));
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// Make sure we are also correct if the handler throws.
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handler.getPrototypeOf = function(target) {
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throw "uncooperative";
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}
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assertThrows("foo(o)");
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// Including if the optimized function has a catch handler.
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function foo_catch(x) {
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try {
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x instanceof Array;
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} catch(e) {
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assertEquals("uncooperative", e);
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return true;
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}
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return false;
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}
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assertTrue(foo_catch(o));
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%OptimizeFunctionOnNextCall(foo_catch);
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assertTrue(foo_catch(o));
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handler.getPrototypeOf = function(target) { return Array.prototype; }
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assertFalse(foo_catch(o));
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}
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TestInstanceOfWithProxies();
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