v8/test/mjsunit/regress/regress-crbug-134055.js

// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --allow-natives-syntax

function crash(obj) {
  return obj.foo;
};
%PrepareFunctionForOptimization(crash);
function base(number_of_properties) {
  var result = new Array();
  for (var i = 0; i < number_of_properties; i++) {
    result["property" + i] = "value" + i;
  }
  result.foo = number_of_properties;
  return result;
}

var a = base(12);
var b = base(13);
var c = base(14);
var d = base(15);

crash(a);  // Premonomorphic.
crash(a);
crash(b);
crash(c);
crash(d);  // Polymorphic, degree 4.

//Prepare ElementsKind transition map chain.
var x = base(13);
x[0] = "object";
x = base(14);
x[0] = "object";
x = base(15);
x[0] = "object";

%OptimizeFunctionOnNextCall(crash);
crash(a);