|  | // Copyright 2014 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 | 
|  |  | 
|  | function t1() { | 
|  | return this instanceof t1; | 
|  | } | 
|  | function t2() { | 
|  | return this instanceof t2; | 
|  | } | 
|  |  | 
|  | var o1 = new function() {}(); | 
|  | Object.defineProperty(o1, 't', { | 
|  | get: function() { | 
|  | return this instanceof o1.constructor; | 
|  | } | 
|  | }); | 
|  | var o2 = new function() {}(); | 
|  | Object.defineProperty(o2, 't', { | 
|  | get: function() { | 
|  | return this instanceof o1.constructor; | 
|  | } | 
|  | }); | 
|  | var o3 = new function() {}(); | 
|  | o3.t = true; | 
|  |  | 
|  | function f(o) { | 
|  | return 1 + (o.t ? 1 : 2); | 
|  | }; | 
|  | %PrepareFunctionForOptimization(f); | 
|  | f(o1); | 
|  | f(o1); | 
|  | f(o2); | 
|  | %OptimizeFunctionOnNextCall(f); | 
|  | f(o3); |