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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions
      6 // are met:
      7 // 1.  Redistributions of source code must retain the above copyright
      8 //     notice, this list of conditions and the following disclaimer.
      9 // 2.  Redistributions in binary form must reproduce the above copyright
     10 //     notice, this list of conditions and the following disclaimer in the
     11 //     documentation and/or other materials provided with the distribution.
     12 //
     13 // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16 // DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20 // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23 
     24 description(
     25 "This tests that a structure clobber in a basic block that does not touch a live variable causes that variable's structure to be correctly clobbered."
     26 );
     27 
     28 var clobberedObject;
     29 
     30 function bar() {
     31     if (!clobberedObject)
     32         return;
     33     delete clobberedObject.f;
     34     clobberedObject.g = 42;
     35 }
     36 
     37 function foo(p, o_) {
     38     var o = o_.f; // Force this block to have a SetLocal.
     39     var x = o.f;
     40     if (p)
     41         bar();
     42     return x + o.f;
     43 }
     44 
     45 var expected = 2;
     46 
     47 for (var i = 0; i < 200; ++i) {
     48     var object = {f:1};
     49     var predicate = true;
     50     if (i >= 150) {
     51         clobberedObject = object;
     52         expected = 0/0; // "NaN"
     53     }
     54     shouldBe("foo(predicate, {f:object})", "" + expected);
     55 }
     56