| // Copyright 2015 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 --no-stress-opt --opt --no-always-opt |
| |
| // --nostress-opt is specified because the test corrupts the "pristine" |
| // array prototype chain by storing an element, and this is tracked |
| // per-isolate. A subsequent stress run would send the load generic, |
| // and no more deoptimizations of foo would occur. |
| |
| function foo(a, i) { return a[i]; } |
| |
| %PrepareFunctionForOptimization(foo); |
| var a = ['one', , 'three']; |
| foo(a, 0); |
| foo(a, 0); |
| foo(a, 0); |
| %OptimizeFunctionOnNextCall(foo); |
| assertEquals(undefined, foo(a, 1)); |
| assertOptimized(foo); |
| |
| // Whereas if we disrupt the prototype chain... |
| Array.prototype[1] = 'cow'; |
| assertEquals('cow', foo(a, 1)); |
| assertUnoptimized(foo); |
