1 // Copyright 2015 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Flags: --allow-natives-syntax 6 // Flags: --nostress-opt 7 8 // --nostress-opt is specified because the test corrupts the "pristine" 9 // array prototype chain by storing an element, and this is tracked 10 // per-isolate. A subsequent stress run would send the load generic, 11 // and no more deoptimizations of foo would occur. 12 13 function foo(a, i) { return a[i]; } 14 15 var a = ['one', , 'three']; 16 foo(a, 0); 17 foo(a, 0); 18 foo(a, 0); 19 %OptimizeFunctionOnNextCall(foo); 20 assertEquals(undefined, foo(a, 1)); 21 assertOptimized(foo); 22 23 // Whereas if we disrupt the prototype chain... 24 Array.prototype[1] = 'cow'; 25 assertEquals('cow', foo(a, 1)); 26 assertUnoptimized(foo); 27
