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Diffstat (limited to 'deps/v8/test/mjsunit/keyed-load-hole-to-undefined.js')
-rw-r--r-- | deps/v8/test/mjsunit/keyed-load-hole-to-undefined.js | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/keyed-load-hole-to-undefined.js b/deps/v8/test/mjsunit/keyed-load-hole-to-undefined.js new file mode 100644 index 0000000000..e9403b8c5e --- /dev/null +++ b/deps/v8/test/mjsunit/keyed-load-hole-to-undefined.js @@ -0,0 +1,26 @@ +// 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 +// Flags: --nostress-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]; } + +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); |